CN214099553U - Modular plastic shell type circuit breaker arc extinguishing device - Google Patents
Modular plastic shell type circuit breaker arc extinguishing device Download PDFInfo
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- CN214099553U CN214099553U CN202022905319.2U CN202022905319U CN214099553U CN 214099553 U CN214099553 U CN 214099553U CN 202022905319 U CN202022905319 U CN 202022905319U CN 214099553 U CN214099553 U CN 214099553U
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Abstract
The utility model discloses a modularization plastic casing formula circuit breaker arc extinguishing device, it includes moving contact, static contact, explosion chamber, the moving contact is connected with the static contact movable contact, the moving contact sets up in the explosion chamber, be provided with the arc extinguishing bars piece of arranging fixedly in the explosion chamber, still include the arc extinguishing module, the arc extinguishing module sets up at the explosion chamber static contact end, the upper and lower two-layer structure that the arc extinguishing module divides the integral type to connect, the upper strata is the arc extinction passageway, the lower floor is the cable channel, the bedplate is in the middle of the two-layer, the cable channel is used for settling the static contact binding post, the arc extinction passageway is provided with spaced arc extinguishing orifice plate; arc extinguishing module and explosion chamber between be baffle I, I upper end of baffle is provided with porose I and arc extinction passageway intercommunication, compares traditional plastic casing formula circuit breaker arc extinguishing structure, this device structural design is reasonable, the temperature rise is low, the arc extinction is effectual.
Description
Technical Field
The utility model relates to a switchgear technical field specifically is a modularization plastic casing circuit breaker arc extinction device.
Background
The conventional plastic shell type circuit breaker generally has a rated working voltage of between 400 and 690V, and if the circuit breaker is applied to more than 800V, for example, a high-voltage grade molded case circuit breaker for protecting a photovoltaic power generation system requires a rated working voltage of 1000V, the conventional plastic shell is a structure of the circuit breaker, which cannot meet the application requirements, so that the temperature rise problem exists, and when a moving contact and a static contact are disconnected, the generated electric arc is too long, even if the arc is extinguished by an arc extinguishing grid piece, the problem that a part of the electric arc burns out a wiring terminal still exists, so that a short-circuit accident is caused.
Disclosure of Invention
In order to solve the technical problem, the utility model provides a modularization plastic casing circuit breaker arc extinction device, structural design is reasonable, and the temperature rise is low, the arc extinction is effectual.
In order to realize the purpose of the utility model, the utility model adopts the technical proposal that:
the arc extinguishing device comprises a moving contact, a fixed contact and an arc extinguishing chamber, wherein the moving contact is in movable contact connection with the fixed contact, the moving contact is arranged in the arc extinguishing chamber, arc extinguishing grid pieces which are fixedly arranged are arranged in the arc extinguishing chamber, the arc extinguishing module is arranged at the fixed contact end of the arc extinguishing chamber, the arc extinguishing module is of an upper layer structure and a lower layer structure which are connected in an integrated manner, the upper layer is an arc extinguishing channel, the lower layer is a cable channel, the middle of the two layers is a base plate, the cable channel is used for accommodating the fixed contact connecting terminal, and the arc extinguishing channel is provided with spaced arc extinguishing pore plates; arc extinguishing module and explosion chamber between be baffle I, I upper end of baffle is provided with porose I and arc extinction passageway intercommunication.
The distance between the arc extinguishing hole plates is provided with gradually reduced area sections from the arc inlet direction to the arc outlet direction. The distance between the first arc-extinguishing hole plate and the second arc-extinguishing hole plate is the largest, the distance between the second arc-extinguishing hole plate and the third arc-extinguishing hole plate is the next to the distance between the first arc-extinguishing hole plate and the third arc-extinguishing hole plate, and the distance between the arc-extinguishing hole plates at the rear part is the fixed distance.
The arc extinguishing chamber is internally provided with two arc blowing plates which are fixed on two sides of the moving contact in parallel, the front end of each arc blowing plate is provided with an arc extinguishing grid piece, the two arc blowing plates form a vertical channel, and when electric arcs are generated, the electric arcs in the arc blowing plates move towards the direction of the arc extinguishing grid pieces; the blowing board be PA46 board, play the air-blast effect to electric arc, explosion chamber lower extreme base set up slottedly, the blowing board lower extreme integral type of both sides is connected, the lower extreme is installed and is fixed spacingly at the inslot, the upper end passes through the explosion chamber upper cover pressfitting and fixes.
The arc extinguishing module comprises a seat plate and a channel side plate which are connected in an integrated manner, the upper end of the arc extinguishing module is sealed by an upper cover plate, and the lower end of the arc extinguishing module is fixedly connected with a base of the circuit breaker.
The arc extinguishing pore plates are iron plates, and holes II are uniformly distributed, so that the arc extinguishing pore plates have an arc extinguishing effect.
Each group of moving and static contacts corresponds to an independent arc extinguish chamber, an arc extinguish channel and a cable channel, and the arc extinguish chambers and the arc extinguish channels are separated by insulating plates.
The static contact is a U-shaped rotary static contact, an iron magnetic blowing sheet is fixed in the U-shaped bend of the static contact, the end part of the static contact is bent downwards to form an arc striking angle, when the static contact generates an electric arc, the U-shaped static contact is electrified to generate a magnetic field, and the electric arc can be blown to the arc extinguishing grid sheet at the bottom from the U-shaped bend of the static contact.
The modular plastic shell type circuit breaker arc extinguishing device forms a four-stage switch circuit breaker, and the four-stage switch circuit breaker comprises four static contacts and four moving contacts, each moving contact comprises a moving contact I, a moving contact II, a moving contact III and a moving contact IV, each static contact comprises a static contact I, a static contact II, a static contact III and a static contact IV, the static contacts I and IV are connected with a positive electrode and a negative electrode of a power supply, the moving contacts I, the moving contacts II, the moving contacts III and the moving contacts IV are in movable contact connection with the corresponding static contacts I, the static contacts II, the static contacts III and the static contacts IV respectively, the moving contacts I are connected with the static contacts II in series through flexible connections, and the moving contacts IV are connected with the static contacts III in series through flexible connections.
And two ends of the flexible connection are respectively welded with the wiring end of the moving contact I and the fixed contact II, and the flexible connection is a copper strip. Load end and wiring end part are separated for be provided with two breakpoints between load incoming end and the power positive pole, but standardized production, and the circuit breaker temperature rise of this structure is low.
Furthermore, a flexible connecting channel is arranged at the lower end of the shell of the direct current plastic shell type circuit breaker, one end of the flexible connecting channel is welded with the rotating shaft part of the moving contact I, and the other end of the flexible connecting channel is welded with the lower end of the current conducting plate where the static contact II is located; an insulating cavity is separately arranged on the back of a base at the lower end of the shell and used for accommodating flexible connection, and the insulating cavity is provided with two connecting ports which are respectively communicated with a moving contact I chamber and an adjacent static contact II chamber.
The arc-extinguishing grid plate comprises a plurality of rows of grid plate plates which are vertically arranged, the thickness of the grid plate at the lowest end is larger than that of the grid plate close to the upper end, specifically, the thicknesses of the three grid plate at the lowest end are 3mm, 2mm and 1.5mm from bottom to top in sequence, and the thicknesses of the rest grid plates are 1.5 mm; the grid plate is fixed through insulating plates at two end sides, and is specifically an insulating plate made of melamine. The thickness design of the grid plate of the arc-extinguishing grid plate is beneficial to prolonging the service life of the arc-extinguishing grid plate and eliminating electric arcs at the static contact.
The circuit breaker shell of the left side wall and the right side wall at the arc extinguish chamber mounted at the front end of the base is thickened by 2mm respectively, the thickness of the circuit breaker shell is increased to 6mm from 4mm, and meanwhile, the outer side walls of the two arc extinguish chambers at the most lateral sides are provided with pressure reduction exhaust holes, so that the left side surface and the right side surface of the base are prevented from being broken by high-pressure gas generated during breaking.
Compared with a molded case circuit breaker with a low-voltage grade, the arc extinguish chamber is higher, and the on-off angle and the on-off distance of the moving contact are increased.
The utility model has the advantages that: the device can be applied to a circuit breaker with a 800V or 1000V high-voltage grade plastic shell, and compared with a traditional low-voltage grade circuit breaker, the arc extinction module is designed into a two-layer structure, the upper layer is an arc extinction channel, and the lower layer is an electric connection cable, so that arc extinction and independent separation of wiring are formed, arc extinction is realized, and cables can be protected; the structural design of the moving contact and the static contact is favorable for reducing the temperature rise; the structural design in the arc extinguishing chamber is favorable for improving the arc extinguishing effect, and avoids causing interphase short circuit, short circuit to the ground, burning out cables or insulating copper bars.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of a structure of a blowing arc plate according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the back side structure connection of the moving and static contacts I of the present invention;
FIG. 4 is a schematic wiring diagram of the circuit of FIG. 3;
1-fixed contact I, 2-fixed contact II, 3-fixed contact III, 4-fixed contact IV, 5-flexible connection, 6-movable contact I, 7-movable contact IV, 8-base, 9-arc extinguish chamber, 10-arc extinguish channel, 11-cable channel, 12-base plate, 13-upper cover plate, 14-arc extinguish grid sheet, 16-arc striking angle, 17-magnetic blow sheet, 18-arc extinguish plate, 19-partition I, 20-arc extinguish hole plate.
Detailed Description
The utility model discloses a following explains in detail with the accompanying drawings, a modularization plastic casing circuit breaker arc extinguishing device as shown in the accompanying drawings, it includes moving contact, the static contact, explosion chamber 9, the moving contact is connected with the static contact movable contact, the moving contact sets up in explosion chamber 9, be provided with the fixed arc extinguishing bars piece 14 of range in the explosion chamber 9, still include the arc extinguishing module, the arc extinguishing module sets up at explosion chamber 9 stationary contact end, the upper and lower two-layer structure that the arc extinguishing module divides the integral type to connect, the upper strata is arc extinguishing passageway 10, the lower floor is cable channel 11, be bedplate 12 in the middle of the two-layer, cable channel 11 is used for settling the static contact binding post, arc extinguishing passageway 10 is provided with spaced arc extinguishing orifice plate 20; between arc extinguishing module and the explosion chamber 9 be baffle I19, baffle I19 upper end sets up porose I and arc extinguishing channel 10 intercommunication.
The distance between the arc extinguishing hole plates 20 is provided with a gradually decreasing area section from the arc inlet direction to the arc outlet direction. That is, counting from the arc-entering direction, the distance between the first arc-extinguishing orifice plate 20 and the second arc-extinguishing orifice plate 20 is the largest, the distance between the second arc-extinguishing orifice plate 20 and the third arc-extinguishing orifice plate 20 is the second, and the distance between the rear arc-extinguishing orifice plates 20 is the same as the distance between the first arc-extinguishing orifice plate 20 and the third arc-extinguishing orifice plate 20.
The arc extinguishing chamber 9 is internally provided with two arc blowing plates 18, the two arc blowing plates 18 are fixed on two sides of the moving contact in parallel, the front end of each arc blowing plate 18 is provided with an arc extinguishing grid piece 14, the two arc blowing plates 18 form a vertical channel, and when electric arcs are generated, the electric arcs in the arc blowing plates 18 move towards the direction of the arc extinguishing grid pieces 14; the blowing board 18 be the PA46 board, play the air-blast effect to electric arc, explosion chamber 9 lower extreme base 8 set up slottedly, the 18 lower extreme integral type of blowing board of both sides is connected, the lower extreme is installed and is fixed spacingly at the inslot, the upper end is passed through explosion chamber 9 upper cover pressfitting and is fixed.
The arc extinguishing module comprises a seat plate 12 and a channel side plate which are integrally connected, the upper end of the arc extinguishing module is sealed by an upper cover plate 13, and the lower end of the arc extinguishing module is fixedly connected with a base 8 of the circuit breaker.
The arc extinguishing orifice plate 20 is an iron plate, and holes II are uniformly distributed, so that the arc extinguishing orifice plate has an arc extinguishing effect.
Each group of moving and static contacts corresponds to an independent arc extinguish chamber 9, an arc extinguish channel and a cable channel 11, and the arc extinguish chambers 9 and the arc extinguish channels are separated by insulating plates.
The static contact is a U-shaped rotary static contact, an iron magnetic blowing sheet 17 is fixed in the U-shaped bend of the static contact, the end part of the static contact is bent downwards to form an arc striking angle 16, after an electric arc is generated on the static contact, the U-shaped static contact is electrified to generate a magnetic field, and the electric arc can be blown to the arc extinguishing grid sheet 14 at the bottom from the U-shaped bend of the static contact.
The modular plastic shell type circuit breaker arc extinguishing device forms a four-stage switch circuit breaker, and the four-stage switch circuit breaker comprises four fixed contacts and four moving contacts, each moving contact comprises a moving contact I6, a moving contact II, a moving contact III and a moving contact IV 7, each fixed contact comprises a fixed contact I1, a fixed contact II 2, a fixed contact III 3 and a fixed contact IV 4, the fixed contacts I1 and IV 4 are connected with the positive electrode and the negative electrode of a power supply, each moving contact I6, the moving contacts II, the moving contacts III and IV 7 are in movable contact connection with the corresponding fixed contacts I1, the fixed contacts II 2, the fixed contacts III 3 and IV 4 respectively, each moving contact I6 is connected with the corresponding fixed contact II 2 in series through a flexible connection 5, and each moving contact IV 7 is connected with the corresponding fixed contact III 3 in series through a flexible connection 5.
Two ends of the flexible connection 5 are respectively welded with the wiring end of the moving contact I6 and the fixed contact II 2, and the flexible connection 5 is a copper strip. Load end and wiring end part are separated for be provided with two breakpoints between load incoming end and the power positive pole, but standardized production, and the circuit breaker temperature rise of this structure is low.
Furthermore, a soft connection 5 channel is arranged at the lower end of the direct current plastic shell type circuit breaker shell, one end of the soft connection 5 is welded with the rotating shaft part of the moving contact I6, and the other end of the soft connection 5 is welded with the lower end of the current conducting plate where the static contact II 2 is located; an insulating cavity is separately arranged on the back of a base 8 at the lower end of the shell and used for accommodating the flexible connection 5, and the insulating cavity is provided with two connecting ports which are respectively communicated with a moving contact I6 chamber and an adjacent static contact II 2 chamber.
The arc-extinguishing grid plates 14 comprise a plurality of rows of grid plate plates which are vertically arranged, the thickness of the grid plate at the lowest end is larger than that of the grid plate close to the upper end, specifically, the thicknesses of the three grid plate at the lowest end are 3mm, 2mm and 1.5mm from bottom to top in sequence, and the thicknesses of the rest grid plates are 1.5 mm; the grid plate is fixed through insulating plates at two end sides, and is specifically an insulating plate made of melamine. The thickness design of the grid plate of the arc-extinguishing grid plate 14 is beneficial to prolonging the service life of the arc-extinguishing grid plate 14 and eliminating electric arcs at the static contact.
The circuit breaker shell of the left side wall and the right side wall of the arc extinguish chamber 9 at the front end of the base 8 is thickened by 2mm respectively, the thickness of the circuit breaker shell is increased to 6mm from 4mm, and meanwhile, the outer side walls of the two arc extinguish chambers 9 at the most lateral sides are provided with pressure reduction exhaust holes, so that the left side surface and the right side surface of the base 8 are prevented from being broken by high-pressure gas generated during breaking.
Compared with a molded case circuit breaker with a low-voltage grade, the arc extinguish chamber 9 is higher, and the opening angle and the opening distance of the moving contact are increased.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, without departing from the principles of the present invention, several improvements can be made, and these improvements should also be regarded as the protection scope of the present invention without creative work.
Claims (10)
1. The utility model provides a modularization plastic casing circuit breaker arc extinguishing device, it includes moving contact, static contact, explosion chamber, and the moving contact is connected with static contact movable contact, and the moving contact setting is provided with the fixed arc extinguishing bars piece of range in the explosion chamber, its characterized in that in the explosion chamber: the arc extinguishing module is arranged at a stationary contact end of the arc extinguishing chamber, the arc extinguishing module is of an upper layer structure and a lower layer structure which are connected in an integrated manner, the upper layer is an arc extinguishing channel, the lower layer is a cable channel, the middle of the two layers is a base plate, the cable channel is used for accommodating a stationary contact wiring terminal, and the arc extinguishing channel is provided with spaced arc extinguishing pore plates; arc extinguishing module and explosion chamber between be baffle I, I upper end of baffle is provided with porose I and arc extinction passageway intercommunication.
2. The modular plastic case circuit breaker arc suppression apparatus of claim 1, wherein: the distance between the arc extinguishing hole plates is provided with gradually reduced area sections from the arc inlet direction to the arc outlet direction.
3. The modular plastic case circuit breaker arc suppression apparatus of claim 1, wherein: arc-blowing plates are arranged in the arc-extinguishing chamber, the two arc-blowing plates are fixed on two sides of the moving contact I in parallel, arc-extinguishing grid pieces are arranged at the front ends of the arc-blowing plates, and the two arc-blowing plates form a vertical channel.
4. A modular plastic case circuit breaker arc suppression apparatus as claimed in claim 3, wherein: the arc blowing plate is a PA46 plate.
5. The modular plastic case circuit breaker arc suppression apparatus of claim 1, wherein: the arc extinguishing module comprises a seat plate and a channel side plate which are connected in an integrated manner, the upper end of the arc extinguishing module is sealed by an upper cover plate, and the lower end of the arc extinguishing module is fixedly connected with a base of the circuit breaker.
6. The modular plastic case circuit breaker arc suppression apparatus of claim 1, wherein: the arc extinguishing pore plates are iron plates and are uniformly distributed with holes II.
7. The modular plastic case circuit breaker arc suppression apparatus of claim 1, wherein: the static contact is a U-shaped rotary static contact, an iron magnetic blowing sheet is fixed in a U-shaped bend of the static contact, and the end part of the static contact is bent downwards to form an arc striking angle.
8. The modular plastic case circuit breaker arc suppression apparatus of claim 1, wherein: the modular plastic shell type circuit breaker arc extinguishing device forms a four-stage switch circuit breaker, and the four-stage switch circuit breaker comprises four static contacts and four moving contacts, each moving contact comprises a moving contact I, a moving contact II, a moving contact III and a moving contact IV, each static contact comprises a static contact I, a static contact II, a static contact III and a static contact IV, the static contacts I and IV are connected with a positive electrode and a negative electrode of a power supply, the moving contacts I, the moving contacts II, the moving contacts III and the moving contacts IV are in movable contact connection with the corresponding static contacts I, the static contacts II, the static contacts III and the static contacts IV respectively, the moving contacts I are connected with the static contacts II in series through flexible connections, and the moving contacts IV are connected with the static contacts III in series through flexible connections.
9. The modular plastic case circuit breaker arc suppression apparatus of claim 8, wherein: two ends of the flexible connection are respectively welded with the wiring end of the moving contact I and the fixed contact I; the lower end of a base of a direct-current plastic shell type circuit breaker shell is provided with a flexible connection channel, one end of the flexible connection is welded with a rotating shaft part of a moving contact I, and the other end of the flexible connection is welded with the lower end of a current conducting plate where a static contact II is located; an insulating cavity is separately arranged on the back of a base at the lower end of the shell and used for accommodating flexible connection, and the insulating cavity is provided with two connecting ports which are respectively communicated with a moving contact I chamber and an adjacent static contact II chamber.
10. The modular plastic case circuit breaker arc suppression apparatus of claim 1, wherein: the arc extinguishing grid plates comprise a plurality of rows of grid plate plates which are vertically arranged, and the grid plate at the lowest end is thicker than the grid plate close to the upper end; and the outer side walls of the two arc extinguish chambers at the most lateral sides are provided with pressure reduction exhaust holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022905319.2U CN214099553U (en) | 2020-12-07 | 2020-12-07 | Modular plastic shell type circuit breaker arc extinguishing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022905319.2U CN214099553U (en) | 2020-12-07 | 2020-12-07 | Modular plastic shell type circuit breaker arc extinguishing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214099553U true CN214099553U (en) | 2021-08-31 |
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ID=77456230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022905319.2U Active CN214099553U (en) | 2020-12-07 | 2020-12-07 | Modular plastic shell type circuit breaker arc extinguishing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214099553U (en) |
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2020
- 2020-12-07 CN CN202022905319.2U patent/CN214099553U/en active Active
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