CN112908749B - Arc extinguishing devices and circuit breakers - Google Patents
Arc extinguishing devices and circuit breakers Download PDFInfo
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- CN112908749B CN112908749B CN201911228317.XA CN201911228317A CN112908749B CN 112908749 B CN112908749 B CN 112908749B CN 201911228317 A CN201911228317 A CN 201911228317A CN 112908749 B CN112908749 B CN 112908749B
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- 238000005192 partition Methods 0.000 claims description 47
- 238000007664 blowing Methods 0.000 abstract description 15
- 230000005611 electricity Effects 0.000 abstract description 2
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000033001 locomotion Effects 0.000 description 13
- 238000010891 electric arc Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 5
- 230000005389 magnetism Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 238000013459 approach Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 210000003205 muscle Anatomy 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
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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
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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
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The embodiment of the invention provides an arc extinguishing device and a circuit breaker, which relate to the field of electricity, wherein the arc extinguishing device comprises a first arc striking piece, a second arc striking piece and an arc extinguishing chamber, the first arc striking piece and the second arc striking piece are oppositely arranged, the first arc striking piece is provided with a first contact, and the second arc striking piece is provided with a second contact. An arc striking channel is formed between the first arc striking piece and the second arc striking piece, the surface of one side of the arc extinguishing chamber, which is close to the arc striking channel, is an arc feeding plane, an arc feeding port is arranged on the arc feeding plane, and the arc feeding port is used for guiding an arc in the arc striking channel to enter an inner cavity of the arc extinguishing chamber. One side of the first arc striking piece, which is close to the arc striking channel, is provided with a guide plane, and a dihedral angle between the guide plane and the arc striking plane is a, and a is more than or equal to 45 degrees and less than or equal to 90 degrees. The arc extinguishing device is capable of enabling the reduction rate of electromagnetic blowing force to be slower while the arc is continuously lengthened, enabling the electromagnetic blowing force to continuously act on the arc, enabling the arc to enter the arc extinguishing chamber faster, and reducing burn of the arc to the first contact and the second contact.
Description
Technical Field
The invention relates to the field of electricity, in particular to an arc extinguishing device and a circuit breaker.
Background
In the prior art, an arc extinguishing chamber in a circuit breaker is used for extinguishing an arc generated between a moving contact and a fixed contact. The inventor researches and finds that the generated arc moves slowly in the process of moving towards the arc extinguishing chamber, and the arc burns seriously on the arc striking piece.
Disclosure of Invention
The present invention aims to provide an arc extinguishing device which can effectively improve the technical problems.
The object of the present invention is also to provide a circuit breaker comprising the above mentioned arc extinguishing device and having the full function of the arc extinguishing device.
Embodiments of the present invention are implemented as follows:
in a first aspect, an embodiment provides an arc extinguishing device, including a first arc striking member, a second arc striking member and an arc extinguishing chamber, where the first arc striking member and the second arc striking member are oppositely disposed, a first contact is disposed on a side of the first arc striking member, which is close to the second arc striking member, and a second contact is disposed on a side of the second arc striking member, which is close to the first arc striking member;
an arc striking channel for enabling an arc generated between the first contact and the second contact to pass is formed between the first arc striking piece and the second arc striking piece, one side surface of the arc extinguishing chamber, which is close to the arc striking channel, is an arc feeding plane, an arc feeding port is arranged on the arc feeding plane, and the arc feeding port is used for guiding the arc in the arc striking channel to enter an inner cavity of the arc extinguishing chamber;
One side of the first arc striking piece, which is close to the arc striking channel, is provided with a guiding plane used for guiding the electric arc to enter the arc inlet, and a dihedral angle between the guiding plane and the arc inlet plane is a, and a is more than or equal to 45 degrees and less than or equal to 90 degrees.
In an alternative embodiment, the distance from the first contact to the arc inlet along the surface of the first striking member is equal to the distance from the second contact to the arc inlet along the guide plane.
In an alternative embodiment, the opening formed when the first contact and the second contact are separated is opposite to the arc inlet.
In an alternative embodiment, the first arc striking member comprises a guide plate and a support plate for supporting the arc extinguishing chamber, the support plate is used for being attached to the bottom wall of the arc extinguishing chamber, the guide plate is connected with the support plate, the guide plane is the plate surface of the guide plate, and the first contact is arranged on the guide plate.
In an alternative embodiment, the support plate has a support plane for supporting the arc extinguishing chamber, the arc entry plane being perpendicular to the support plane, the dihedral angle between the guide plane and the support plane being b, b=a+90°.
In an alternative embodiment, the support plane intersects the guide plane to form a common line, which is located on the arc entry plane.
In an alternative embodiment, the guide plate is a bar-shaped structure.
In an alternative embodiment, the first arc striking member further comprises an extension plate, the guide plate is located between the extension plate and the support plate, and the guide plate is simultaneously connected with the extension plate and the support plate, and the first contact is located at one end of the guide plate close to the extension plate.
In an alternative embodiment, the arc extinguishing device further comprises a bottom plate, the bottom plate is simultaneously connected with the guide plate and the support plate, the bottom plate is located on one side of the guide plate away from the arc striking channel, and the bottom plate is located on one side of the support plate away from the arc extinguishing chamber.
In an alternative embodiment, the arc extinguishing device further comprises a first partition plate, a second partition plate and an extension arm, wherein the first partition plate and the second partition plate are opposite and are arranged at intervals, the first partition plate and the second partition plate are both connected with the bottom plate, the extension arm and the bottom plate are opposite, one end of the extension arm is connected with the first partition plate, the other end of the extension arm is connected with the second partition plate, and the first partition plate, the bottom plate, the second partition plate and the extension arm enclose to form a containing space for containing the guide plate and the second arc striking piece.
In an alternative embodiment, the bottom plate includes first connecting plate and second connecting plate, first connecting plate with the backup pad is connected, the second connecting plate includes interconnect's first connecting portion and second connecting portion, the second connecting portion is located first connecting portion with between the first connecting plate, first connecting portion with the guide board is connected, the second connecting portion with have the clearance between the guide board, be provided with on the first baffle towards the convex protruding muscle of second baffle, protruding muscle inlays and locates in the clearance.
In an optional embodiment, the arc extinguishing device further comprises a first magnetic increasing sheet and a second magnetic increasing sheet, a first clamping groove is formed in one side, away from the second separator, of the first separator, a second clamping groove is formed in one side, away from the first separator, of the second separator, and the first magnetic increasing sheet and the second magnetic increasing sheet are respectively embedded in the first clamping groove and the second clamping groove.
In an alternative embodiment, the second striking member is rotatably connected to the arc extinguishing chamber so as to bring the second contact closer to or farther from the first contact.
In a second aspect, an embodiment provides a circuit breaker comprising an arc extinguishing device according to any of the preceding embodiments.
The beneficial effects of the embodiment of the invention include, for example:
The embodiment of the invention provides an arc extinguishing device, wherein an arc is generated at the moment from contact to separation of a first contact and a second contact, and electromagnetic blowing force for enabling the arc to move towards an arc extinguishing chamber is generated at the moment of separation by utilizing the acting force of a magnetic field on current. When the dihedral angle between the guide plane and the arc inlet plane is a, and a is in the range of 45-90 degrees, when the electric arc is continuously elongated, the reducing speed of the electromagnetic blowing force is slower, and the electromagnetic blowing force continuously acts on the electric arc, so that the electric arc can move to the arc inlet along the guide plane faster, and then enter into the arc extinguishing chamber faster, burn of the electric arc to the first contact and the second contact is reduced, and the service lives of the first contact and the second contact are prolonged. Meanwhile, the movement time of the arc into the arc extinguishing chamber is shortened, so that the arc is not easy to accumulate energy, and after entering the arc extinguishing chamber, the arc extinguishing chamber has stronger breaking capacity on the arc, and the arc can be extinguished more easily.
The embodiment of the invention also provides a circuit breaker which comprises the arc extinguishing device, and the circuit breaker can enable an electric arc to enter an arc extinguishing chamber faster, reduce burn of the electric arc to the first contact and the second contact and prolong service lives of the first contact and the second contact. Similarly, the circuit breaker shortens the movement time from the arc to the arc extinguishing chamber, the arc is not easy to accumulate energy, and the arc extinguishing chamber has stronger breaking capacity to the arc, so that the arc is easy to extinguish.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of an arc extinguishing device according to an embodiment of the present invention at a first view angle;
Fig. 3 is an exploded schematic view of an arc extinguishing device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a first arc striking member according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an arc extinguishing device according to an embodiment of the present invention at a second view angle;
Fig. 6 is a schematic structural diagram of an arc extinguishing device according to an embodiment of the present invention at a third view angle;
FIG. 7 is a schematic diagram of a first partition, a second partition, a base plate, and an extension arm connection according to an embodiment of the present invention;
Fig. 8 is a schematic structural diagram of a first separator according to an embodiment of the present invention.
Icon: 1-a circuit breaker; 11-a box body; 12-arc extinguishing device; 121-a first arc striking member; 1211-a guiding plane; 1212-guide plates; 12121-a third connection; 12122-fourth connection; 1213-a support plate; 1214-a support plane; 1215-a common line; 1216-an extension plate; 1217-a bottom plate; 12171-first connection plate; 12172-first connection portion; 12173-a second connection; 12174-a second connection plate; 12175-gap; 1218-a first separator; 12181-a first card slot; 12182-projecting ribs; 1219-a second separator; 12191-a second card slot; 1220-extension arm; 1221-an accommodation space; 123-a second arc striking member; 124-arc extinguishing chamber; 1241-arc entrance plane; 1242-an arc inlet; 125-first contacts; 126-second contact; 127-arc striking channel; 128-openings; 129-a first magnetic increasing sheet; 130-a second magnetic increasing sheet; 131-an arc striking plate; 14-an operating mechanism.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the term "vertical" does not mean that the component is required to be absolutely vertical, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, the present embodiment provides a circuit breaker 1, the circuit breaker 1 includes a case 11 and an arc extinguishing device 12, the arc extinguishing device 12 is located inside the case 11, and the arc extinguishing device 12 can rapidly eliminate an arc generated when the circuit breaker 1 works.
Specifically, referring to fig. 1 and 2, the present embodiment further provides an arc extinguishing device 12, where the arc extinguishing device 12 includes a first striking member 121, a second striking member 123 and an arc extinguishing chamber 124, the first striking member 121 and the second striking member 123 are oppositely disposed, a first contact 125 is disposed on a side of the first striking member 121 close to the second striking member 123, and a second contact 126 is disposed on a side of the second striking member 123 close to the first striking member 121.
It will be appreciated that in this embodiment, switching the first contact 125 and the second contact 126 from the contact state to the separated state creates an arc.
In this embodiment, the first contact 125 is a fixed contact, and the second contact 126 is a moving contact, that is, the second arc striking member 123 is capable of moving relative to the first arc striking member 121. Specifically, referring to fig. 1 and 2, in the present embodiment, the second striking member 123 is rotatably connected to the arc extinguishing chamber 124, so that the second contact 126 approaches or separates from the first contact 125.
Correspondingly, referring to fig. 1, the circuit breaker 1 further includes an operating mechanism 14, the operating mechanism 14 is in transmission connection with the second arc striking member 123, and a worker can operate the operating mechanism 14 to drive the second arc striking member 123 to rotate relative to the arc extinguishing chamber 124, so that the second contact 126 approaches to or approaches away from the first contact 125.
Note that, referring to fig. 2, in the present embodiment, an arc striking channel 127 for passing an arc can be formed between the first arc striking member 121 and the second arc striking member 123. The surface of the arc extinguishing chamber 124 near the arc striking channel 127 is an arc inlet plane 1241, and an arc inlet 1242 is arranged on the arc inlet plane 1241, wherein the arc inlet 1242 is used for guiding the arc in the arc striking channel 127 into the inner cavity of the arc extinguishing chamber 124.
It will be appreciated that the arc generated between the first contact 125 and the second contact 126 is able to move in the arc striking channel 127 and along the arc striking channel 127, the surface of the first striking member 121 and the surface of the second striking member 123 towards the arc extinguishing chamber 124.
It should be noted that, in this embodiment, at the moment of separation, the first contact 125 and the second contact 126 generate a magnetic field by the current in the circuit near the arc, so that the arc is subjected to the electromagnetic blowing force toward the arc extinguishing chamber 124, and thus, under the electromagnetic blowing force, the arc can move faster to the arc inlet 1242 through the arc striking channel 127, then enter the arc extinguishing chamber 124 through the arc inlet 1242, and the arc extinguishing chamber 124 is used for extinguishing the arc entering the arc extinguishing chamber 124.
It should be noted that, referring to fig. 2, in the present embodiment, a side of the first striking member 121 near the striking channel 127 has a guiding plane 1211 for guiding the arc into the arc inlet 1242, and a dihedral angle a between the guiding plane 1211 and the arc inlet 1241 is a, and a is 55 °.
The inventor researches and discovers that when the angle a is 55 degrees, the component force of the electromagnetic blowing force in the direction of pointing to the arc extinguishing chamber 124 can be reduced slowly while the arc is continuously elongated, the electromagnetic blowing force continuously acts on the arc, the moving speed of the arc towards the arc extinguishing chamber 124 can be effectively improved, the time of the arc entering the arc extinguishing chamber is shortened, the stay time of the arc on the first arc striking piece 121 and the second arc striking piece 123 is reduced, the burn of the arc on the first arc striking piece 121 and the second arc striking piece 123 is reduced, and the service lives of the arc extinguishing device and the circuit breaker are prolonged.
Moreover, the movement time from the arc to the arc extinguishing chamber 124 is shortened, so that the arc is not easy to accumulate energy, and after the arc enters the arc extinguishing chamber 124, the arc extinguishing chamber 124 has stronger breaking capacity to the arc, so that the arc is easy to extinguish.
In other embodiments, a may be 45 °,50 °, 90 °, or the like. Notably, the inventors have studied that the value of a is closer to 90 ° when a is in the range of 45 ° to 90 °, the slower the electromagnetic blow-off force decreases, the faster the arc moves toward the arc chute 124. But the closer the value of a is to 90 °, meaning that the second striking member 123 needs to be rotated by a larger angle to enable the second contact 126 on the second striking member 123 to contact the first contact 125 on the first striking member 121, and the volumes of the first striking member 121 and the second striking member 123 need to be increased accordingly. In this way, the space occupied by the first arc striking member 121 and the second arc striking member 123 in the case 11 is excessively large, which increases the manufacturing cost. Therefore, in the present embodiment, a is preferably 55 °.
In this embodiment, the first arc striking member 121 and the second arc striking member 123 are made of metal. During movement towards the arc chute 124, the arc will move along both the surface of the first arc striking member 121 (i.e., the guide plane 1211) and the surface of the second arc striking member 123. Referring to fig. 2, in the present embodiment, the distance from the first contact 125 to the arc inlet 1242 along the surface of the first striking member 121 is equal to the distance from the second contact 126 to the arc inlet 1242 along the guiding plane 1211.
In this way, it is possible to effectively ensure that the time for the arc to move from the first contact 125 along the surface of the first striking member 121 to the arc inlet 1242 is equal to the time for the arc to move from the second contact 126 along the surface of the second striking member 123 to the arc inlet 1242. Thus, the problem that the service life of the first arc striking member 121 or the second arc striking member 123 is shorter due to the longer burning time of the arc to the first arc striking member 121 or the second arc striking member 123 can be effectively improved.
In this embodiment, the movement time of the arc is less than 3 ms, and when the first contact 125 and the second contact 126 are separated, the distance between the first contact 125 and the second contact 126 is 5.5 mm.
Referring to fig. 2, in the present embodiment, an opening 128 formed when the first contact 125 and the second contact 126 are separated is opposite to the arc inlet 1242.
Like this, can make the electric arc that produces between first contact 125 and the second contact 126 can not appear the condition that the direction of motion changes at the in-process of moving towards explosion chamber 124, can make the electric arc directly enter into in the explosion chamber 124, effectually shorten the action time of electric arc on first striking piece 121 and second striking piece 123, reduce the burn of electric arc to first striking piece 121 and second striking piece 123, prolonged the life of first striking piece 121 and second striking piece 123.
Referring to fig. 2-4, in the present embodiment, the first arc striking member 121 includes a guide plate 1212 and a support plate 1213 for supporting the arc extinguishing chamber 124, the support plate 1213 is used for attaching to the bottom wall of the arc extinguishing chamber 124, the guide plate 1212 is connected to the support plate 1213, the guide plane 1211 is a plate surface of the guide plate 1212, and the first contact 125 is disposed on the guide plate 1212.
It will be appreciated that in this embodiment, the arc chute 124 is placed on the support plate 1213, and the support plate 1213 is capable of supporting and positioning the arc chute 124. Meanwhile, in the present embodiment, the supporting plate 1213 is a metal plate, and the supporting plate 1213 is attached to the bottom wall of the arc extinguishing chamber 124, and the supporting plate 1213 can quickly emit the heat generated in the arc extinguishing chamber 124 to the external environment, so as to protect the arc extinguishing chamber 124.
It should be noted that, in this embodiment, the supporting plate 1213 contacts with the insulating housing of the arc extinguishing chamber 124, so that not only can the installation of the arc extinguishing chamber 124 be positioned, but also the contact between the supporting plate 1213 and the arc extinguishing gate sheets in the arc extinguishing chamber 124 can be effectively avoided, and the effective number of the arc extinguishing gate sheets is ensured.
Of course, in other embodiments, metal plates may be disposed on the side walls or the top wall of the arc extinguishing chamber 124, so as to improve the heat dissipation efficiency of the arc extinguishing chamber 124 and prolong the service life of the arc extinguishing chamber 124.
Specifically, in the present embodiment, the support plate 1213 has a support plane 1214 for supporting the arc extinguishing chamber 124, the arc entrance plane 1241 is perpendicular to the support plane 1214, and the dihedral angle between the guide plane 1211 and the support plane 1214 is b, b=a+90°. In this way, the arc extinguishing chamber 124 can be effectively prevented from tilting on the supporting plane 1214, and the stability of the arc extinguishing chamber 124 on the supporting plate 1213 can be improved. It will be appreciated that in this embodiment b is 145.
It should be noted that, in other embodiments, the supporting plate 1213 may be disposed obliquely on the supporting plate 1213, so that the angle between the guiding plane 1211 and the supporting plane 1214 may be adjusted correspondingly, so that the angle between the guiding plane 1211 and the arc-entering plane 1241 may be within a range of 45 ° to 90 °.
Referring to fig. 2, in the present embodiment, the supporting plane 1214 and the guiding plane 1211 intersect to form a common line 1215, and the common line 1215 is located on the arc-entering plane 1241.
That is, in this embodiment, the arc moves along the guide plane 1211 to a point where the guide plane 1211 intersects the support plane 1214, i.e., from the arc entrance 1242 into the arc chute 124 at a first time. That is, the arc can enter the arc extinguishing chamber 124 immediately after the arc is separated from the guide plane 1211, and the arc extinguishing chamber 124 can extinguish the arc in time. In addition, the arrangement mode enables the arc to jump from the guide plane 1211 to the supporting plane 1214, the surface area of the supporting plane 1214 is large, the arc can be cooled down quickly, and the arc can be extinguished quickly.
Referring to fig. 2, in the present embodiment, the arc extinguishing device further includes an arc striking plate 131, the arc striking plate 131 is disposed at an upper portion of the arc extinguishing chamber 124, and an arc moving along the second arc striking member 123 jumps onto the arc striking plate 131 and enters the arc extinguishing chamber 124. Specifically, in the present embodiment, after the arc enters the arc extinguishing chamber 124, the lower end of the arc is on the supporting plane 1214, and the upper end of the arc is on the striking plate 131.
Referring to fig. 3 and 4, in the present embodiment, the guide plate 1212 has a bar-shaped structure.
Specifically, in the present embodiment, the guide plate 1212 is a rectangular plate. In the present embodiment, the guide plate 1212 is a bar-shaped structure, which means that the ratio of the length of the guide plate 1212 to the width of the guide plate 1212 is greater than 3.
In this way, the guide plate 1212 can be made to have good guiding performance, irregular movement of the arc on the guide plane 1211 is not likely to occur, deviation of the movement direction of the arc is likely to occur, and movement toward the arc extinguishing chamber 124 along the guide plane 1211 can be straight. In this way, the arc extinguishing chamber 124 can extinguish the arc more quickly, and meanwhile, the movement time of the arc on the guide plate 1212 can be effectively shortened, so that the burn of the arc on the guide plate 1212 is reduced.
Referring to fig. 2-4, in the present embodiment, the first arc striking member 121 further includes an extension plate 1216, the guide plate 1212 is located between the extension plate 1216 and the support plate 1213, and the guide plate 1212 is connected to the extension plate 1216 and the support plate 1213 at the same time, and the first contact 125 is located at an end of the guide plate 1212 near the extension plate 1216.
In the present embodiment, the extension plate 1216 is also a metal plate. The inventors have found that the extension plate 1216 is disposed adjacent to the first contact 125 and the second contact 126, and is effective to enhance the magnetic field strength between the first contact 125 and the second contact 126, so that when an arc is generated between the first contact 125 and the second contact 126, the enhanced magnetic field strength can increase the generated electromagnetic blowing force, so that the arc has a greater acceleration, and thus the movement rate of the arc toward the arc extinguishing chamber 124 is increased.
Referring to fig. 2, 3 and 5, in the present embodiment, the arc extinguishing device 12 further includes a bottom plate 1217, the bottom plate 1217 is connected to the guide plate 1212 and the support plate 1213, the bottom plate 1217 is located at a side of the guide plate 1212 away from the arc striking channel 127, and the bottom plate 1217 is located at a side of the support plate 1213 away from the arc extinguishing chamber 124.
In this embodiment, the base plate 1217 is made of an insulating material. It will be appreciated that in this embodiment, the bottom plate 1217 is effective to block leakage of the arc from the bottom of the guide plate 1212 and support plate 1213, reducing the impact of the arc on other components.
Referring to fig. 5, in the present embodiment, the bottom plate 1217 can cover the guide plate 1212 and the support plate 1213 at the same time, and can further prevent the arc from leaking out from the bottoms of the guide plate 1212 and the support plate 1213.
Referring to fig. 5-7, in the present embodiment, the arc extinguishing device 12 further includes a first partition 1218, a second partition 1219, and an extension arm 1220, where the first partition 1218 and the second partition 1219 are opposite and spaced apart, the first partition 1218 and the second partition 1219 are connected to the bottom plate 1217, the extension arm 1220 is opposite to the bottom plate 1217, one end of the extension arm 1220 is connected to the first partition 1218, the other end of the extension arm 1220 is connected to the second partition 1219, and the first partition 1218, the bottom plate 1217, the second partition 1219, and the extension arm 1220 enclose a receiving space 1221 for accommodating the guide plate 1212 and the second arc striking member 123.
It can be appreciated that, in the present embodiment, the arc striking channel 127 is a part of the inner cavity in the accommodating space 1221.
In this embodiment, the first separator 1218, the second separator 1219, and the extension arm 1220 are made of insulating materials. It will be appreciated that, similar to the function of the base plate 1217, the first and second baffles 1218, 1219 and the extension arm 1220 can effectively prevent the arc in the accommodating space 1221 from leaking out, thereby reducing the influence of the arc on other components.
Referring to fig. 7, in the present embodiment, the second partition 1219 is integrally formed with the bottom plate 1217, which is advantageous for mounting and fixing the second partition 1219 and the bottom plate 1217, and for blocking arc leakage.
Referring to fig. 8, in the embodiment, the first separator 1218 is integrally formed with the extension arm 1220, and one end of the extension arm 1220 away from the first separator 1218 is connected to the second separator 1219.
Referring to fig. 2 and 8, in the present embodiment, the bottom plate 1217 includes a first connecting plate 12171 and a second connecting plate 12174, the first connecting plate 12171 is connected to the supporting plate 1213, the second connecting plate 12174 includes a first connecting portion 12172 and a second connecting portion 12173 that are connected to each other, the second connecting portion 12173 is located between the first connecting portion 12172 and the first connecting plate 12171, the first connecting portion 12172 is connected to the guiding plate 1212, a gap 12175 is provided between the second connecting portion 12173 and the guiding plate 1212, a protruding rib 12182 protruding toward the second partition 1219 is disposed on the first partition 1218, and the protruding rib 12182 is embedded in the gap 12175.
In this way, the stability of the first baffle 1218 can be effectively ensured, and the first baffle 1218 is not easily separated from the bottom plate 1217.
Specifically, in the present embodiment, the extending direction of the protruding rib 12182 is parallel to the extending direction of the extension arm 1220, facilitating the installation of the first and second partitions 1218 and 1219.
Note that, referring to fig. 2 and 4, in the present embodiment, the guide plate 1212 includes a third connecting portion 12121 and a fourth connecting portion 12122, the fourth connecting portion 12122 is located between the third connecting portion 12121 and the support plate 1213, the third connecting portion 12121 is located between the fourth connecting portion 12122 and the extension plate 1216, the third connecting portion 12121, the fourth connecting portion 12122, and the support plate 1213 are sequentially connected.
Note that, in the present embodiment, the thickness of the third connecting portion 12121 is larger than the thickness of the fourth connecting portion 12122. It is to be understood that, in the present embodiment, after the third connecting portion 12121 is connected to the first connecting portion 12172, the above-mentioned gap 12175 can be formed between the fourth connecting portion 12122 and the second connecting portion 12173.
Of course, in other embodiments, the thickness of the third connecting portion 12121 may be equal to the thickness of the fourth connecting portion 12122, and the plate surface of the first connecting plate 12171 and the plate surface of the guide plate 1212 may be inclined to each other, so that the gap 12175 may be formed.
Referring to fig. 3 and fig. 6-8, in the present embodiment, the arc extinguishing device 12 further includes a first magnetism increasing sheet 129 and a second magnetism increasing sheet 130, a first clamping groove 12181 is disposed on a side of the first partition 1218 away from the second partition 1219, a second clamping groove 12191 is disposed on a side of the second partition 1219 away from the first partition 1218, and the first magnetism increasing sheet 129 and the second magnetism increasing sheet 130 are respectively embedded in the first clamping groove 12181 and the second clamping groove 12191.
In this embodiment, the first magnetic increasing piece 129 and the second magnetic increasing piece 130 can increase the magnetic field strength in the accommodating space 1221, so as to increase the electromagnetic blowing force generated between the first contact 125 and the second contact 126, and increase the movement rate of the arc toward the arc extinguishing chamber 124.
To sum up, the principle of the arc extinguishing device 12 provided in the present embodiment is as follows:
In the initial state, the second contact 126 on the second striking member 123 is in contact with the first contact 125 on the first striking member 121. The operator operates the operating mechanism 14 such that the second striking member 123 rotates with respect to the arc extinguishing chamber 124, the second contact 126 on the second striking member 123 is separated from the first contact 125 on the first striking member 121, and an arc is generated between the first contact 125 and the second contact 126.
At the same time, at the moment when the first contact 125 and the second contact 126 are separated, the current in the circuit near the arc generates a magnetic field, so that the arc is subjected to electromagnetic blowing force towards the arc extinguishing chamber 124, and under the electromagnetic blowing force, the arc moves along the arc striking channel 127, the surface of the first arc striking member 121 (i.e., the guiding plane 1211) and the surface of the second arc striking member 123, reaches the arc inlet 1242, and enters the arc extinguishing chamber 124 through the arc inlet 1242, and the arc extinguishing chamber 124 extinguishes the arc.
The arc extinguishing device 12 can enable the reduction rate of the electromagnetic blowing force to be slower while the arc is continuously lengthened, and the electromagnetic blowing force continuously acts on the arc, so that the arc can enter the arc extinguishing chamber 124 faster to the arc inlet 1242, the arc is extinguished in a shorter time, the burn of the arc to the first contact 125 and the second contact 126 is reduced, and the service lives of the first contact 125 and the second contact 126 are prolonged. Meanwhile, the movement time from the arc to the arc extinguishing chamber 124 is shortened, so that the arc is not easy to accumulate energy, and after the arc enters the arc extinguishing chamber 124, the arc extinguishing chamber 124 has stronger breaking capacity to the arc, and the arc can be extinguished more easily.
The above is only a specific embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911228317.XA CN112908749B (en) | 2019-12-04 | 2019-12-04 | Arc extinguishing devices and circuit breakers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911228317.XA CN112908749B (en) | 2019-12-04 | 2019-12-04 | Arc extinguishing devices and circuit breakers |
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| CN112908749A CN112908749A (en) | 2021-06-04 |
| CN112908749B true CN112908749B (en) | 2024-11-22 |
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| CN201911228317.XA Active CN112908749B (en) | 2019-12-04 | 2019-12-04 | Arc extinguishing devices and circuit breakers |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024017044A1 (en) * | 2022-07-21 | 2024-01-25 | 上海良信电器股份有限公司 | Switch unit, isolating switch and power supply system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016004622A (en) * | 2014-06-13 | 2016-01-12 | 富士電機株式会社 | Circuit breaker |
| CN211150366U (en) * | 2019-12-04 | 2020-07-31 | 上海良信电器股份有限公司 | Arc extinguishing device and circuit breaker |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1615246A1 (en) * | 2004-07-05 | 2006-01-11 | ABB Schweiz AG | Arc extinguishing device for circuit breaker |
| CN106548912B (en) * | 2015-09-22 | 2019-08-09 | 浙江正泰电器股份有限公司 | Breaker |
| CN208352246U (en) * | 2018-05-16 | 2019-01-08 | 德力西电气有限公司 | A kind of arc quenching system of miniature circuit breaker |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016004622A (en) * | 2014-06-13 | 2016-01-12 | 富士電機株式会社 | Circuit breaker |
| CN211150366U (en) * | 2019-12-04 | 2020-07-31 | 上海良信电器股份有限公司 | Arc extinguishing device and circuit breaker |
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