CN108766848B - Arc extinguishing structure of circuit breaker - Google Patents
Arc extinguishing structure of circuit breaker Download PDFInfo
- Publication number
- CN108766848B CN108766848B CN201810647197.6A CN201810647197A CN108766848B CN 108766848 B CN108766848 B CN 108766848B CN 201810647197 A CN201810647197 A CN 201810647197A CN 108766848 B CN108766848 B CN 108766848B
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- Prior art keywords
- contact
- moving contact
- insulating partition
- arc extinguishing
- shell
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- 238000005192 partition Methods 0.000 claims abstract description 121
- 230000003068 static effect Effects 0.000 claims description 18
- 238000002955 isolation Methods 0.000 claims description 15
- 238000009413 insulation Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 9
- 238000000638 solvent extraction Methods 0.000 claims description 4
- 238000004880 explosion Methods 0.000 claims 2
- 125000006850 spacer group Chemical group 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 210000003205 muscle Anatomy 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
- H01H9/346—Details concerning the arc formation chamber
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- 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
- H01H73/04—Contacts
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- 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
- H01H73/06—Housings; Casings; Bases; Mountings
-
- 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
- H01H73/20—Terminals; Connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
- H01H9/36—Metal parts
- H01H9/362—Mounting of plates in arc chamber
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The arc extinguishing structure of the circuit breaker comprises a shell 5 of the circuit breaker, and a moving contact, a fixed contact and an insulating partition plate which are arranged in the shell 5, wherein the middle part of the moving contact is rotatably arranged in the shell 5 through a rotating shaft, a moving contact matched with the fixed contact of the fixed contact is arranged on a moving contact part at one end of the moving contact, a driving part at the other end of the moving contact is in driving connection with the insulating partition plate, and two side edges of the insulating partition plate 1 are in contact with the shell 5; when the moving contact and the fixed contact of the circuit breaker are separated, the moving contact rotates, the moving contact on the moving contact part is separated from the fixed contact of the fixed contact, the driving part drives the insulating partition plate to move, and the insulating partition plate is matched with the shell 5 to completely separate between the moving contact part and the fixed contact of the moving contact. The invention provides an arc extinguishing structure of a circuit breaker, which effectively solves the problem that an arc cannot be extinguished or the arc is re-burnt due to high arc energy and improves the switching-on and switching-off capacity of the circuit breaker.
Description
Technical Field
The invention relates to the technical field of piezoelectric devices, in particular to an arc extinguishing structure of a circuit breaker.
Background
The molded case circuit breaker is a device for protecting electrical equipment and lines. The switching-on and switching-off capacity of the circuit breaker determines the size of the short circuit load which can be borne by the circuit. When the existing plastic-case circuit breaker is used for switching on and off high voltage and high current, the phenomenon that the arc is reburnt or even can not be extinguished is easy to occur due to high arc energy, so that the circuit breaker can not realize the improvement of the switching on and off capability when the high voltage and high current are switched off, especially in a direct current photovoltaic circuit breaker.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an arc extinguishing structure of a circuit breaker, which effectively solves the problems that the arc cannot be extinguished or the arc is reburnt due to large arc energy and improves the switching-on and switching-off capacity of the circuit breaker.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the arc extinguishing structure of the circuit breaker comprises a shell 5 of the circuit breaker, a moving contact 8, a fixed contact 7 and an insulating partition board 1, wherein the moving contact 8, the fixed contact 7 and the insulating partition board 1 are arranged in the shell 5, the middle part of the moving contact 8 is rotatably arranged in the shell 5 through a rotating shaft 6, a moving contact 80 matched with the fixed contact 70 of the fixed contact 7 is arranged on a moving contact part 81 at one end of the moving contact 8, and a driving part 82 at the other end of the moving contact 8 is in driving connection with the insulating partition board 1; when the moving contact 8 and the fixed contact 7 of the circuit breaker are separated, the moving contact 8 rotates, the moving contact 80 on the moving contact part 81 is separated from the fixed contact 70 of the fixed contact 7, the driving part 82 drives the insulating partition plate 1 to move, the insulating partition plate 1 is matched with the shell 5 to be completely blocked between the moving contact part 81 and the fixed contact 7 of the moving contact 8, the inside of the shell is divided into two independent insulating chambers, and the moving contact and the fixed contact are respectively positioned in the two independent insulating chambers.
Preferably, one end of the insulating partition board 1 is a partition part 11 for partitioning the moving contact 8 and the fixed contact 7, the other end is a driven part 13, the driving part 82 of the moving contact 8 is in driving connection with the insulating partition board 1 through a pushing rod 2, one end of the pushing rod 2 is connected to the driving part 82 of the moving contact 8, and the other end of the pushing rod 2 is abutted against the driven part 13 of the insulating partition board 1.
Preferably, the insulating partition board 1 is disposed between the moving contact 8 and the fixed contact 7, the push rod 2 is disposed at the rear of the insulating partition board 1, the partition portion 11 of the insulating partition board 1 is a horizontal plate, the driven portion 13 is a vertical plate, and the insulating partition board 1 further includes a connection portion 12, and the connection portion 12 is an inclined plate connected between the partition portion 11 and the driven portion 13 in an inclined manner.
Preferably, one end of the fixed contact 7 provided with the fixed contact 70 is a fixed contact part 71, the other end is a wiring part 72, the shell 5 is provided with an isolation chamber 502 for completely wrapping the fixed contact part 71 of the fixed contact 7, the top of the isolation chamber 502 is provided with a avoidance gap 503 positioned below the movable contact 80, the fixed contact part 71 of the fixed contact 7 is arranged in the isolation chamber 502, and the fixed contact 70 is arranged in the avoidance gap 503; when the movable contact 80 is separated from the stationary contact 70, the insulating spacer 1 completely shields the escape gap 503 of the isolation chamber 502.
Preferably, the housing 5 is formed by assembling two half-shells 500 that are mutually coupled, the corners of the half-shells 500 are provided with positioning protruding blocks 504, the positioning protruding blocks 504 are lower than the first side walls 5001 of the half-shells 500 to form limiting inclined planes 505 that are matched with the wiring parts 72 of the fixed contacts 7, the half-shells 500 are further provided with protruding ribs 507, one ends of the protruding ribs 507 are connected with the first side walls 5001 of the half-shells 500 and are flush with the first side walls 5001, the other ends of the protruding ribs 507 are spaced from the positioning protruding blocks 504 to form the avoiding gaps 503, and the isolating chambers 502 are defined among the first side walls 5001 of the half-shells 500, the positioning protruding blocks 504 and the protruding ribs 507.
Preferably, two guide grooves 4 for guiding the insulating partition board 1 are symmetrically arranged on the shell 5, and two side edges of the insulating partition board 1 are respectively movably inserted into the guide grooves 4.
Preferably, the guide groove 4 is arranged on the positioning protruding block 504 of the shell 5, and is surrounded by a guide wall surface 41 for guiding the movement of the insulating partition board 1, a stop wall surface 42 for limiting the final position of the movement of the insulating partition board 1 and a limiting wall surface 43 for limiting the upward deflection of the insulating partition board 1, which are connected in sequence, wherein the guide wall surface 41 is level with the top surface of the convex rib 507.
Preferably, a resetting piece for resetting the insulating partition board 1 is arranged between the insulating partition board 1 and the shell 5; when the circuit breaker is switched on, the movable contact 8 rotates, the acting force of the driving part 82 on the insulating partition board 1 is removed, the insulating partition board 1 resets under the action of the resetting piece to withdraw the contact area between the movable contact 8 and the fixed contact 7, and the movable contact 80 on the movable contact part 81 is contacted with the fixed contact 70 of the fixed contact 7.
Preferably, the resetting piece is two tension springs 3 separately arranged at two sides of the moving contact 8, two hook holes 14 for the two tension springs 3 to hook are formed in the insulating partition board 1, two fixing columns 501 for the two tension springs 3 to hook are formed in the shell 5, one ends of the tension springs 3 are hooked on the fixing columns 501 of the shell 5, and the other ends of the tension springs 3 are hooked in the hook holes 14 of the insulating partition board 1.
Preferably, the housing 5 is further provided with an arc-extinguishing chamber 9, the arc-extinguishing chamber 9 is located above the fixed contact 7 and on one side of the moving contact 8, and comprises a plurality of arc-extinguishing grid plates 90 which are stacked, one end, close to the moving contact 8, of each arc-extinguishing grid plate 90 is provided with an arc-extinguishing notch, and the moving contact 81 of the moving contact 8 can extend into the arc-extinguishing notch.
Preferably, the arc extinguishing gap comprises an arch-shaped root 91 and a square end 92 which are communicated, and the width of the arch-shaped root 91 is smaller than that of the square end 92.
Preferably, the arc-extinguishing gate plates 90 are obliquely arranged, one end of each arc-extinguishing gate plate 90, which is close to the moving contact 8, is pressed down towards the direction of the fixed contact 7, and the other end of each arc-extinguishing gate plate 90 is lifted upwards; the top end of the positioning protrusion 504 of the housing 5 is provided with a supporting inclined plane 506, the arc extinguishing bar 90 located at the bottommost is placed on the supporting inclined plane 506, and the arc extinguishing bar 90 located at the bottommost is shorter than the other arc extinguishing bars 90.
The arc extinguishing structure of the circuit breaker is particularly suitable for a molded case circuit breaker which is switched on and off at high voltage and high current, and the movable insulating partition plate is matched with the shell to divide the interior of the shell into two independent insulating chambers, so that the movable contact and the fixed contact are completely insulated, arc splashing caused by overlarge arc energy is effectively avoided, the problem that the arc cannot be extinguished or the arc is reburned is solved, and the switching-on and switching-off capacity of the circuit breaker is improved; meanwhile, the insulating partition board moves synchronously along with the action of the movable contact, so that the insulating partition board can separate or withdraw between the movable contact and the fixed contact more accurately and timely, and the reliability of the switching-on and switching-off capacity of the circuit breaker is improved.
Drawings
Fig. 1 is a schematic view of a circuit breaker in a contact-open state according to the present invention;
fig. 2 is a schematic structural view of the circuit breaker in a closed state according to the present invention;
Fig. 3 is an exploded view of the circuit breaker of the present invention;
FIG. 4 is a schematic view of the structure of a half shell of the present invention;
FIG. 5 is a schematic view of the structure of an insulating separator according to the present invention;
FIG. 6 is a schematic view of the structure of the stationary contact of the present invention;
fig. 7 is a schematic structural view of the moving contact of the present invention.
Detailed Description
The following describes further embodiments of the arc extinguishing structure of the circuit breaker according to the invention in connection with the examples given in fig. 1 to 7. The arc extinguishing structure of the circuit breaker of the present invention is not limited to the description of the following embodiments.
As shown in fig. 1-3 and fig. 7, the arc extinguishing structure of the circuit breaker comprises a shell 5 of the circuit breaker, a moving contact 8, a fixed contact 7 and an insulating partition board 1, wherein the moving contact 8, the fixed contact 7 and the insulating partition board 1 are arranged in the shell 5, the middle part of the moving contact 8 is rotatably arranged in the shell 5 through a rotating shaft 6, a moving contact 80 matched with the fixed contact 70 of the fixed contact 7 is arranged on a moving contact part 81 at one end of the moving contact 8, a driving part 82 at the other end of the moving contact 8 is in driving connection with the insulating partition board 1, and two side edges of the insulating partition board 1 are in contact with the shell 5; when the moving contact 8 and the fixed contact 7 of the circuit breaker are separated, the moving contact 8 rotates, the moving contact 80 on the moving contact part 81 is separated from the fixed contact 70 of the fixed contact 7, the driving part 82 drives the insulating partition plate 1 to move, the insulating partition plate 1 is matched with the shell 5 to be completely blocked between the moving contact part 81 and the fixed contact 7 of the moving contact 8, the inside of the shell is divided into two independent insulating chambers, and the moving contact and the fixed contact are respectively positioned in the two independent insulating chambers. The arc extinguishing structure of the circuit breaker is particularly suitable for a molded case circuit breaker which is switched on and off at high voltage and high current, and the movable insulating partition board is matched with the shell 5 to divide the interior of the shell into two independent insulating chambers, so that the movable contact and the fixed contact are completely insulated, arc splashing caused by overlarge arc energy is effectively avoided, the problem that the arc cannot be extinguished or the arc is reburned is solved, and the switching-on and switching-off capacity of the circuit breaker is improved; meanwhile, the insulating partition board moves synchronously along with the action of the movable contact, so that the insulating partition board can separate or withdraw between the movable contact and the fixed contact more accurately and timely, and the reliability of the switching-on and switching-off capacity of the circuit breaker is improved.
It should be noted that when the moving contact 8 and the fixed contact 7 are separated, the moving contact 8 must be separated, and the fixed contact 7 may be separated, where the first case is that the fixed contact 7 has a separation structure, and both the moving contact 8 and the fixed contact 7 can be separated; the second case is that the stationary contact 7 is stationary and fixed to the housing 5.
As shown in fig. 3-6, one end of the stationary contact 7 provided with the stationary contact 70 is a stationary contact portion 71, the other end is a wiring portion 72, the housing 5 is provided with an isolation chamber 502 for completely wrapping the stationary contact portion 71 of the stationary contact 7, the top of the isolation chamber 502 is provided with an avoidance gap 503 located below the movable contact 80, the avoidance gap 503 is communicated with the isolation chamber 502 and the housing 5, the stationary contact portion 71 of the stationary contact 7 is arranged in the isolation chamber 502, and the stationary contact 70 is arranged in the avoidance gap 503; the insulating spacer 1 completely shields the escape notch 503 of the isolation chamber 502 when the movable contact 80 is separated from the stationary contact 70. The static contact is arranged in an independent isolation cavity in the shell, so that the static contact can be completely isolated and separated from the movable contact.
Specifically, the casing 5 is formed by assembling two half shells 500 that are coupled with each other, the corner of half shells 500 is equipped with positioning lug 504, positioning lug 504 is lower than first side wall 5001 of half shells 500 in order to form spacing inclined plane 505 that matches with wiring portion 72 of stationary contact 7, still be equipped with protruding muscle 507 on half shells 500, protruding muscle 507's one end is connected with first side wall 5001 of half shells 500 and with first side wall 5001 parallel and level, the other end and positioning lug 504 are alternate to form dodge breach 503, enclose between first side wall 5001 of half shells 500, positioning lug 504 and the protruding muscle 507 keep apart cavity 502.
As shown in fig. 6, in the specific structure of the static contact of the present invention, the static contact portion 71 of the static contact 7 is a U-shaped plate, two side arms of the U-shaped plate are horizontally and horizontally arranged, the middle arm is vertically arranged, the opening of the U-shaped plate faces the wiring portion 72, and the outer contour surface of the U-shaped plate is matched and attached to the inner wall surfaces of the first side wall 5001 and the ribs 507; the wiring portion 72 is a Z-shaped three-section folded plate attached to the limiting inclined plane 505 of the first side wall 5001 in a matching manner, the included angles between two adjacent sections of the Z-shaped three-section folded plate are obtuse angles, and the bottom section of the Z-shaped three-section folded plate is connected with the side arm of the U-shaped plate below.
As shown in fig. 1-5, in the driving structure between the moving contact and the insulating partition board, one end of the insulating partition board 1 is a partition part 11 for partitioning the moving contact 8 and the fixed contact 7, the other end is a driven part 13, a driving part 82 of the moving contact 8 is in driving connection with the insulating partition board 1 through a pushing rod 2, one end of the pushing rod 2 is connected to the driving part 82 of the moving contact 8, and the other end of the pushing rod 2 is abutted against the driven part 13 of the insulating partition board 1. The structure is simple, the transmission between the movable contact and the insulating partition plate is realized by means of the pushing rod, so that the layout is more compact and reasonable, and the transmission is more accurate and stable.
Preferably, as shown in fig. 5, the insulating partition 1 is disposed between the moving contact 8 and the fixed contact 7, the push rod 2 is disposed behind the insulating partition 1, that is, on the right side of the insulating partition 1 as shown in fig. 1 or 2, the partition 11 of the insulating partition 1 is a horizontal plate, the driven portion 13 is a vertical plate, and the insulating partition 1 further includes a connection portion 12, and the connection portion 12 is an inclined plate connected between the partition 11 and the driven portion 13 in an inclined manner. The partition portion 11, the connecting portion 12 and the driven portion 13 of the insulating partition plate 1 are integrally connected in sequence, and the widths of the driven portion 13 and the connecting portion 12 are equal and smaller than the width of the partition portion 11. The insulating partition board has simple structure, convenient production and manufacture, and convenient and quick movement. The specific structure of the insulating spacer 1 of the present invention includes, but is not limited to, the three-stage folded plate structure described above, however, the insulating spacer 1 may be other structures, only by ensuring that the partition 11 can move forward along the track, the driven portion 13 can receive stress, and the connecting portion 12 functions to connect the partition 11 and the driven portion 13, for example, the insulating spacer 1 may be an arc plate or other abnormal plate.
Further, the end of the pushing rod 2 is provided with a pushing protrusion 20 matched with the driven portion 13 of the insulating partition board 1, and the pushing protrusion 20 is a square bump as shown in fig. 1 or an arc bump as shown in fig. 2. The square bump type pushing protrusion has higher pushing efficiency; the arc convex block type pushing protrusion has more uniform and consistent transmission and high stability. Of course, the specific structure of the pushing projection 20 of the present invention includes, but is not limited to, square projections and circular projections, but other structures such as polygonal blocks are also possible.
As shown in fig. 3, the push rod 2 is connected with the moving contact 8 through a pin 21, and the driving portion 82 of the moving contact 8 and the end portion of the push rod 2 are provided with pin holes 210 matched with the pin 21. Preferably, the number of the pushing rods 2 is two, one ends of the two pushing rods 2 are clamped at two sides of the driving part 82 of the moving contact 8, and the pin shaft 21 is inserted into the pin shaft hole 210 to realize the fixed connection between the two pushing rods 2 and the moving contact 8; the other ends of the two push rods 2 simultaneously act on the driven portion 13 of the same insulating partition board 1. Of course, the push rod 2 may also be integrally connected to the driving portion 82 of the movable contact 8, instead of being one or several separate parts. Compared with the integral connection between the push rod and the moving contact, the pin shaft connection structure between the push rod and the moving contact enables the moving contact to be produced and manufactured according to the original standard component, brings convenience to batch production, and meanwhile, the assembly structure between the push rod and the moving contact is simple, and manual or automatic assembly can be simply realized.
As shown in fig. 3-6, in the guiding structure for moving the insulating partition board according to the present invention, two guiding grooves 4 for guiding the insulating partition board 1 are symmetrically provided on the housing 5, that is, one guiding groove 4 is provided on each of the two half-shells 500, and two side edges of the insulating partition board 1 are respectively movably inserted into the guiding grooves 4. The guide groove 4 is horizontally arranged and is matched with the partition part 11 of the insulating partition board 1. The guide groove is arranged, so that the guide and standardization effects on the movement of the insulating partition board are achieved, and the partition effect of the insulating partition board on the movable contact and the static contact is improved.
Specifically, the guide groove 4 is disposed on the positioning protrusion 504 of the housing 5, and is surrounded by a guide wall 41 for guiding the movement of the insulating partition board 1, a stop wall 42 for limiting the final position of the movement of the insulating partition board 1, and a limiting wall 43 for limiting the upward deflection of the insulating partition board 1, which are sequentially connected, and the guide wall 41 is flush with the top surface of the protruding rib 507 to jointly play a role in guiding the movement of the insulating partition board 1. The top surface of the stationary contact 70 is flush with the limiting wall 43. The stop side wall 40 of the present invention is provided at the end of the guide groove 4, and of course, the stop side wall 40 may be provided at a position within the guide groove 4. The side wall of the guide groove of the shell 5 is matched with the insulating partition board to form a completely closed partition barrier between the movable contact and the static contact, thereby completely partitioning the movable contact and the static contact; compared with the insulation partition board directly abutted against the shell 5, the invention is symmetrically provided with the two guide grooves, and the insulation partition board and the side walls of the guide grooves are staggered and laminated, so that a completely closed partition barrier can be formed, and meanwhile, gaps are allowed between the insulation partition board and the panel of the shell 5, thereby avoiding blocking the movement of the insulation partition board.
As shown in fig. 3 and 4, in the mounting structure of the moving contact of the present invention, a circular protrusion 509 with a central hole cavity 508 is provided on a half shell 500 of the housing 5, the circular protrusion 509 is connected with a protrusion rib 507, a contact support 10 is further provided in the housing 5, two ends of the contact support 10 are rotatably mounted in the central hole cavities 508 of the two half shells 500, a support groove for supporting the moving contact 8 is provided in the middle of the contact support 10, the middle of the moving contact 8 is disposed in the support groove of the contact support 10, a rotating shaft hole 60 matched with the rotating shaft 6 is provided through the moving contact 8 and the contact support 10, the rotating shaft 6 is fixedly mounted on the housing 5, and the moving contact 8 and the contact support 10 are rotatably mounted on the rotating shaft 6 through the rotating shaft hole 60.
As shown in fig. 3, the housing 5 is further provided with an arc extinguishing chamber 9, the arc extinguishing chamber 9 is located above the fixed contact 7 and on one side of the moving contact 8, and comprises a plurality of arc extinguishing grid plates 90 which are stacked, one end of each arc extinguishing grid plate 90, which is close to the moving contact 8, is provided with an arc extinguishing gap, a moving contact portion 81 of the moving contact 8 can extend into the arc extinguishing gap, the arc extinguishing gap comprises an arch root 91 and a square end 92 which are communicated, and the width of the arch root 91 is smaller than that of the square end 92. The arc extinguishing gate sheet 90 is obliquely arranged, one end of the arc extinguishing gate sheet 90, which is close to the moving contact 8, is downward pressed towards the direction of the fixed contact 7, and the other end of the arc extinguishing gate sheet 90 is upward lifted; the top of the positioning lug 504 of the shell 5 is provided with a supporting inclined plane 506, the arc extinguishing grid plate 90 at the bottommost part is arranged on the supporting inclined plane 506, the arc extinguishing grid plate 90 at the bottommost part is matched with the supporting inclined plane 506, is slightly longer than the supporting inclined plane 506 and is greatly shorter than other arc extinguishing grid plates 90, and plays the roles of striking and cutting arcs and avoids the insulating partition plate 1.
As shown in fig. 1 and 2, in the resetting structure of the insulating partition board of the present invention, a resetting piece for resetting the insulating partition board 1 is arranged between the insulating partition board 1 and the shell 5; when the circuit breaker is switched on, the movable contact 8 rotates, the acting force of the driving part 82 on the insulating partition board 1 is removed, the insulating partition board 1 resets under the action of the resetting piece to withdraw the contact area between the movable contact 8 and the fixed contact 7, and the movable contact 80 on the movable contact part 81 is contacted with the fixed contact 70 of the fixed contact 7. The insulation separation of the insulating partition board 1 from the contact area between the moving contact 8 and the fixed contact 7 means that the insulation separation does not prevent the closing action between the moving contact 8 and the fixed contact 7.
Further, the resetting piece is two tension springs 3 separately arranged at two sides of the moving contact 8, two hook holes 14 for the two tension springs 3 to hook are formed in the insulating partition board 1, two fixing columns 501 for the two tension springs 3 to hook are formed in the shell 5, one ends of the tension springs 3 are hooked on the fixing columns 501 of the shell 5, and the other ends of the tension springs 3 are hooked in the hook holes 14 of the insulating partition board 1. Specifically, the two hooking holes 14 are respectively provided on both sides of the partition portion 11 of the insulating separator 1 at the end connected to the connecting portion 12; the two fixing posts 501 are symmetrical to each other and are provided on the two half-shells 500 of the housing 5. The pushing rod 2 and the moving contact 8 are positioned between the two tension springs 3. As shown in fig. 1 or 2, the insulating spacer 1 moves leftward in the forward direction and rightward in the return direction.
As shown in fig. 1, when the circuit breaker of the invention breaks due to short-circuit fault current, the moving contact 8 starts to open under the action of the action mechanism, combustion arc is generated between the moving contact 8 and the fixed contact 7 due to high voltage, the push rod 2 moves rapidly along with the clockwise rotation of the moving contact 8 around the rotating shaft 6, so that the partition part 11 of the insulating partition board 1 is pushed to move forward along the guide groove 4 until moving to the tail end of the guide groove, the moving contact 8 and the fixed contact 7 are completely partitioned and separated, the loop of the fixed contact 7 is closed, and rapid arc extinction is realized.
As shown in fig. 2, when the circuit breaker is in a closing state, a movable contact 8 is in a closing state, an insulating partition board 1 is reset under the action of a reset spring force of a double tension spring 3, a driving part 82 of the insulating partition board 1 is abutted against a pushing protrusion 20 of a pushing rod 2, and the pushing protrusion 20 of the pushing rod 2 plays a limiting role on the movement initial position of the insulating partition board 1.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (10)
1. An arc extinguishing structure of a circuit breaker, characterized in that: the circuit breaker comprises a shell (5) of the circuit breaker, and a moving contact (8), a fixed contact (7) and an insulating partition plate (1) which are arranged in the shell (5), wherein the middle part of the moving contact (8) is rotatably arranged in the shell (5) through a rotating shaft (6), a moving contact part (81) at one end of the moving contact (8) is provided with a moving contact (80) matched with a fixed contact (70) of the fixed contact (7), and a driving part (82) at the other end of the moving contact (8) is in driving connection with the insulating partition plate (1); when a moving contact (8) and a fixed contact (7) of the circuit breaker are separated, the moving contact (8) rotates, a moving contact (80) on a moving contact part (81) is separated from a fixed contact (70) of the fixed contact (7), a driving part (82) drives an insulating partition plate (1) to move, the insulating partition plate (1) is matched with a shell (5) to be completely blocked between the moving contact part (81) and the fixed contact (7) of the moving contact (8), the shell is divided into two independent insulating chambers, and the moving contact and the fixed contact are respectively positioned in the two independent insulating chambers;
One end of the static contact (7) provided with the static contact (70) is a static contact part (71), the other end of the static contact is a wiring part (72), the shell (5) is provided with an isolation cavity (502) used for completely wrapping the static contact part (71) of the static contact (7), the top of the isolation cavity (502) is provided with an avoidance gap (503) positioned below the movable contact (80), the static contact part (71) of the static contact (7) is arranged in the isolation cavity (502), and the static contact (70) is arranged in the avoidance gap (503); when the movable contact (80) is separated from the fixed contact (70), the insulating partition board (1) completely shields the avoidance notch (503) of the isolation chamber (502);
The shell (5) is formed by assembling two half shells (500) which are mutually coupled, a positioning lug (504) is arranged at the corner of each half shell (500), a convex rib (507) is further arranged on each half shell (500), one end of each convex rib (507) is connected with a first side wall (5001) of each half shell (500) and is flush with the first side wall (5001), the other end of each convex rib is spaced from the corresponding positioning lug (504) to form an avoidance gap (503), and an isolation cavity (502) is formed by surrounding the first side wall (5001) of each half shell (500), the corresponding positioning lug (504) and the corresponding convex rib (507).
2. The arc extinguishing structure of a circuit breaker according to claim 1, characterized in that: one end of the insulating partition plate (1) is a partition part (11) for partitioning the moving contact (8) and the fixed contact (7), the other end of the insulating partition plate is a driven part (13), a driving part (82) of the moving contact (8) is in driving connection with the insulating partition plate (1) through a pushing rod (2), one end of the pushing rod (2) is connected to the driving part (82) of the moving contact (8), and the other end of the pushing rod (2) is abutted to the driven part (13) of the insulating partition plate (1).
3. The arc extinguishing structure of a circuit breaker according to claim 2, characterized in that: the insulation baffle (1) is arranged between the moving contact (8) and the fixed contact (7), the push rod (2) is arranged at the rear of the insulation baffle (1), the partition part (11) of the insulation baffle (1) is a horizontal plate, the driven part (13) is a vertical plate, the insulation baffle (1) further comprises a connecting part (12), and the connecting part (12) is an inclined plate which is obliquely connected between the partition part (11) and the driven part (13).
4. An arc extinguishing structure of a circuit breaker according to any one of claims 1-3, characterized in that: two guide grooves (4) for guiding the insulating partition board (1) are symmetrically arranged on the shell (5), and two side edges of the insulating partition board (1) are respectively movably inserted into the guide grooves (4).
5. The arc extinguishing structure of a circuit breaker according to claim 4, wherein: the guide groove (4) is arranged on a positioning lug (504) of the shell (5), and is formed by encircling a guide wall surface (41) for guiding the movement of the insulating partition plate (1), a stop wall surface (42) for limiting the final position of the movement of the insulating partition plate (1) and a limit wall surface (43) for limiting the upward deflection of the insulating partition plate (1) which are connected in sequence, wherein the guide wall surface (41) is flush with the top surface of the convex rib (507).
6. An arc extinguishing structure of a circuit breaker according to any one of claims 1-3, characterized in that: a resetting piece for resetting the insulating partition plate (1) is arranged between the insulating partition plate (1) and the shell (5); when the circuit breaker is switched on, the movable contact (8) rotates, the acting force of the driving part (82) on the insulating partition board (1) is removed, the insulating partition board (1) is reset under the action of the resetting piece to withdraw a contact area between the movable contact (8) and the fixed contact (7), and the movable contact (80) on the movable contact part (81) is in contact with the fixed contact (70) of the fixed contact (7).
7. The arc extinguishing structure of a circuit breaker according to claim 6, wherein: the reset piece is two extension springs (3) which are respectively arranged at two sides of the movable contact (8), two hook holes (14) which can be used for the two extension springs (3) to hook are formed in the insulating partition plate (1), two fixing columns (501) which can be used for the two extension springs (3) to hook are formed in the shell (5), one end of each extension spring (3) is hooked on the fixing column (501) of the shell (5), and the other end of each extension spring is hooked in the hook hole (14) of the insulating partition plate (1).
8. An arc extinguishing structure of a circuit breaker according to any one of claims 1-3, characterized in that: still be equipped with explosion chamber (9) in casing (5), explosion chamber (9) are located the top of static contact (7) and one side of moving contact (8), including a plurality of arc extinguishing bars piece (90) of range upon range of setting, arc extinguishing bars piece (90) are close to the one end of moving contact (8) and are equipped with the arc extinguishing breach, moving contact portion (81) of moving contact (8) can stretch into in the arc extinguishing breach.
9. The arc extinguishing structure of a circuit breaker according to claim 8, wherein: the arc extinguishing gap comprises an arch-shaped root (91) and a square end (92) which are communicated, and the width of the arch-shaped root (91) is smaller than that of the square end (92).
10. The arc extinguishing structure of a circuit breaker according to claim 8, wherein: the arc extinguishing grid plates (90) are obliquely arranged, one end, close to the moving contact (8), of each arc extinguishing grid plate (90) is pressed down towards the direction of the fixed contact (7), and the other end of each arc extinguishing grid plate (90) is lifted upwards; the top of the positioning lug (504) of the shell (5) is provided with a supporting inclined plane (506), the arc extinguishing grid sheet (90) at the bottommost part is arranged on the supporting inclined plane (506), and the arc extinguishing grid sheet (90) at the bottommost part is shorter than other arc extinguishing grid sheets (90).
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| CN201810647197.6A CN108766848B (en) | 2018-06-21 | 2018-06-21 | Arc extinguishing structure of circuit breaker |
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| CN201810647197.6A CN108766848B (en) | 2018-06-21 | 2018-06-21 | Arc extinguishing structure of circuit breaker |
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| CN108766848B true CN108766848B (en) | 2024-07-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112185719A (en) * | 2019-07-05 | 2021-01-05 | 北京京人电器有限公司 | Load switch |
| CN112509891A (en) * | 2019-09-16 | 2021-03-16 | 河南森源电气股份有限公司 | Plastic case circuit breaker |
| CN110931327A (en) * | 2019-12-31 | 2020-03-27 | 邹耿彪 | Baffle arc control device and have baffle arc control device's circuit breaker |
| CN112164637B (en) * | 2020-10-21 | 2025-04-22 | 上海正泰智能科技有限公司 | Arc isolating mechanism of circuit breaker |
| CN114121565A (en) * | 2021-11-29 | 2022-03-01 | 浙江中亿豪科技有限公司 | Spring type isolation arc extinguishing mechanism of circuit breaker |
| CN114334571A (en) * | 2021-12-21 | 2022-04-12 | 湖北腾明智能电气有限公司 | Isolated bipolar double-breakpoint circuit breaker |
| CN119419107B (en) * | 2025-01-03 | 2025-04-18 | 浙江西屋电气股份有限公司 | A molded case circuit breaker and a method, medium and device for predicting the electrical life of the molded case circuit breaker |
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