CN108987208B - Miniature circuit breaker and arc extinguishing device thereof - Google Patents
Miniature circuit breaker and arc extinguishing device thereof Download PDFInfo
- Publication number
- CN108987208B CN108987208B CN201710414841.0A CN201710414841A CN108987208B CN 108987208 B CN108987208 B CN 108987208B CN 201710414841 A CN201710414841 A CN 201710414841A CN 108987208 B CN108987208 B CN 108987208B
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- China
- Prior art keywords
- movable contact
- arc
- arc extinguishing
- contact part
- cover
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- 210000001503 joint Anatomy 0.000 claims description 5
- 230000003068 static effect Effects 0.000 abstract 2
- 238000003756 stirring Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a miniature circuit breaker and an arc-extinguishing device thereof, wherein the miniature circuit breaker comprises a shell, a movable contact part and a fixed contact part, wherein the movable contact part and the fixed contact part are respectively connected with the shell, the movable contact part rotates to be contacted with or separated from the fixed contact part, the arc-extinguishing device comprises an arc-extinguishing cover, the arc-extinguishing cover moves and exposes the movable contact part to enable the movable contact part to be contacted with the fixed contact part when the movable contact part rotates to be separated from the fixed contact part, and the arc-extinguishing cover moves and covers the movable contact part when the movable contact part rotates to be separated from the fixed contact part. The miniature circuit breaker and the arc-extinguishing device thereof provided by the invention have the advantages that the movable contact part rotates away from the static contact part, and meanwhile, the arc-extinguishing cover coats the movable contact part to isolate and extinguish the arc between the movable contact part and the static contact part, so that the arc-extinguishing is safe and reliable.
Description
Technical Field
The invention relates to a miniature circuit breaker, in particular to an intelligent miniature circuit breaker which has a compact structure, the external dimension of which meets the standard and can effectively extinguish arc and an arc extinguishing device thereof.
Background
Miniature circuit breakers are one of the most widely used terminal protection appliances in the introduction of building electrical terminal distribution devices. The miniature circuit breaker consists of a switching-on/off mechanism, a contact part, a protection device, an arc extinguishing system and the like. The working principle is as follows: overload and short-circuit protection are realized by using a protection device (release) and a current thermal assembly, when the current passing through a coil in the current thermal assembly is larger than a set current value, a movable iron core of the electromagnetic release acts to push a striking rod to strike an operating mechanism, so that the operating mechanism is unlocked, a circuit breaker is opened, and then the circuit is disconnected, thereby realizing overload and short-circuit protection on the circuit. When the circuit fault is discharged, the switching-on and switching-off mechanism is used for switching-on operation, so that the circuit is switched on. At present, the most miniature circuit breakers used in China nowadays are manual opening and closing type, and the circuit can be opened and closed by manually poking the opening and closing mechanism. The manual opening and closing miniature circuit breaker has simple structure and low cost, and does not need extra electric energy, so that opening and closing operation can be performed under the condition of no electric energy, and the manual opening and closing miniature circuit breaker is widely applied to old power grids.
However, with the development of science and technology, intelligent home appliances are increasingly widely used, and as a common miniature circuit breaker for protecting electric appliances, an intelligent control system is also urgently needed to be additionally arranged. In order to match with a widely-used manual switching-on and switching-off type common miniature circuit breaker, an intelligent miniature circuit breaker capable of being controlled remotely is newly added on one side of the common miniature circuit breaker, and the intelligent miniature circuit breaker drives other common miniature circuit breakers to perform switching-on and switching-off operation according to an input control signal.
The technical specification of the external circuit breaker of the electric energy meter strictly limits the outline dimension of the circuit breaker, wherein the outline shape and dimension of the intelligent miniature circuit breaker are consistent with those of the common miniature circuit breaker, so that the consistency of the appearance is ensured, and the terminal equipment of the circuit breaker is convenient to replace in a large scale.
However, the intelligent miniature circuit breaker in the prior art is generally larger than the common miniature circuit breaker in size and inconsistent in appearance due to the addition of the intelligent control device, so that the intelligent miniature circuit breaker cannot be directly used, and the basic equipment for placing the miniature circuit breaker is required to be adaptively modified before use, so that the intelligent miniature circuit breaker is large in early investment and long in construction period, and is not beneficial to the intelligent power grid propulsion process.
In an electric power system, arcing occurs in a switch breaking circuit, and thus, it is required that the switch be capable of extinguishing an arc rapidly in a small closed container. The arc extinguishing assembly of the intelligent miniature circuit breaker in the prior art generally adopts a mode of leading an arc to an arc extinguishing chamber, but cannot completely achieve the effect of effective arc extinguishing.
Disclosure of Invention
The invention aims to provide an arc extinguishing device and a miniature circuit breaker adopting the same for arc extinguishing, which not only have simple structure, but also occupy small space.
In order to achieve the above object, the present invention provides an arc extinguishing device applied to a miniature circuit breaker, the miniature circuit breaker includes a housing, and a movable contact portion and a stationary contact portion respectively connected to the housing, the movable contact portion rotates to contact with or separate from the stationary contact portion, wherein the arc extinguishing device includes an arc extinguishing cover, the arc extinguishing cover moves and exposes the movable contact portion to contact the movable contact portion and the stationary contact portion when closing a switch, and the arc extinguishing cover moves and covers the movable contact portion when the movable contact portion rotates to separate from the stationary contact portion.
In an embodiment of the above arc extinguishing device, the arc extinguishing chamber is rotatably connected to the housing and includes a stirring portion and an arc extinguishing portion, a gap is formed between the stirring portion and the arc extinguishing portion, the movable contact portion rotates to the gap and drives the stirring portion to rotate, and the arc extinguishing portion is inserted between the movable contact portion and the stationary contact portion.
In an embodiment of the foregoing arc extinguishing device, the arc extinguishing portion is U-shaped and is connected to the striking portion, and a space formed between the arc extinguishing portion and the striking portion forms a housing accommodating the movable contact portion.
In an embodiment of the foregoing arc extinguishing device, the arc extinguishing chamber includes a first arc extinguishing chamber and a second arc extinguishing chamber, the first arc extinguishing chamber is connected to the housing, the second arc extinguishing chamber is sleeved on the movable contact portion, and when the switch is opened, the second arc extinguishing chamber moves and is in butt joint with the first arc extinguishing chamber.
In an embodiment of the above arc extinguishing device, the movable contact portion is rotatably connected to the housing through a movable contact connecting arm.
In an embodiment of the foregoing arc extinguishing device, the second arc extinguishing chamber includes a housing portion, and the housing portion is sleeved on the movable contact portion through the movable contact connecting arm and is capable of moving along the movable contact connecting arm to leave or cover the movable contact portion.
In an embodiment of the foregoing arc extinguishing device, the second arc extinguishing chamber further includes a housing connecting portion, and two sides of the housing connecting portion are respectively hinged to the housing and the housing portion.
In an embodiment of the above arc extinguishing device, the cover body portion includes a cover body front wall and a cover body connecting wall connected to the cover body front wall, and the cover body front wall has a through hole through which the movable contact portion passes.
In an embodiment of the foregoing arc extinguishing device, the first arc extinguishing chamber corresponds to the front wall of the cover body, and when the switch is opened, the first arc extinguishing chamber is in butt joint with the front wall of the cover body.
The invention also provides a miniature circuit breaker, which comprises a shell, a movable contact part, a fixed contact part and an arc extinguishing device, wherein the movable contact part and the fixed contact part are respectively connected with the shell, the movable contact part rotates to be contacted with or separated from the fixed contact part, and the arc extinguishing device is the arc extinguishing device.
The miniature circuit breaker and the arc extinguishing device thereof have the beneficial effects that when the movable contact part rotates to leave the fixed contact part, the movable contact part is covered by the arc extinguishing cover to isolate and extinguish the arc between the movable contact part and the fixed contact part, so that the arc extinguishing is safe and reliable.
The invention will now be described in more detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.
Drawings
Fig. 1 is a schematic structural diagram of a switching-on state of a first embodiment of an arc extinguishing device according to the present invention;
fig. 2 is a schematic structural diagram of a switching device according to a first embodiment of the present invention when the switching device is switched from a closed state to an open state;
fig. 3 is a schematic structural diagram of a switching-off state of a first embodiment of the arc extinguishing device according to the present invention;
fig. 4a is a schematic structural view of a first embodiment of an arc extinguishing device according to the present invention in use;
fig. 4b is a schematic structural view of the arc extinguishing device according to the first embodiment of the present invention (with part of the side wall removed) in use;
fig. 5 is a schematic structural diagram of a closing state of a second embodiment of the arc extinguishing device according to the present invention;
fig. 6 is a schematic structural diagram of a second embodiment of the arc extinguishing device according to the present invention when the arc extinguishing device is transited from a closed state to an open state;
fig. 7 is a schematic structural diagram of a switching-off state of a second embodiment of the arc extinguishing device according to the present invention;
fig. 8 is a partial enlarged view of fig. 6.
Wherein reference numerals are used to refer to
10. Miniature circuit breaker
100. Shell body
200. Moving contact part
300. Stationary contact part
400. Wire inlet end
500. Arc extinguishing cover
510. Toggle part
520. Arc extinguishing part
521. Bottom wall
540. Connecting part
600. Moving contact assembly
610. Arc-shaped access piece
611. A first arc-shaped part
620. Movable contact piece
621. A second arc-shaped part
622. Movable contact connecting arm
700. Arc extinguishing cover
710. First arc-extinguishing chamber
720. Second arc extinguishing chamber
721. Cover body
721a cover front wall
721b cover back wall
721c cover body connecting wall
722. Cover body connecting part
Detailed Description
The following detailed description of the present invention is provided with reference to the accompanying drawings and specific embodiments, so as to further understand the purpose, the scheme and the effects of the present invention, but not to limit the scope of the appended claims.
The arc extinguishing device can be applied to a miniature circuit breaker, and can be applied to other types of switching devices needing arc extinguishing, so that the arc extinguishing is rapid and reliable, and the damage caused by the arc generated by the switching device is effectively avoided. The application to the miniature circuit breaker will be described below.
As shown in fig. 1, the miniature circuit breaker 10 includes a housing 100, a movable contact portion 200, and a stationary contact portion 300, the movable contact portion 200 and the stationary contact portion 300 being connected to the housing 100, respectively. When the miniature circuit breaker 10 is in an operating state, the movable contact part 200 and the stationary contact part 300 are in a normally closed state, namely the movable contact part 200 and the stationary contact part 300 are in contact with each other; when the miniature circuit breaker 10 is in a state of breaking or the like, the movable contact part 200 is touched, and at this time, the movable contact part 200 rotates and is separated from the stationary contact part 300; when the movable contact portion 200 is separated from the stationary contact portion 300, a voltage difference is generated, and an arc is generated.
The arc extinguishing device of the present invention includes an arc extinguishing chamber 500, as shown in fig. 1, and at the time of closing, the arc extinguishing chamber 500 moves and exposes the movable contact part 200 to bring the movable contact part 200 into contact with the stationary contact part 300. As shown in fig. 3, when the movable contact part 200 rotates to be separated from the stationary contact part 300, the arc extinguishing chamber 500 moves to cover the movable contact part 200, so as to rapidly cut off an arc generated between the movable contact part 200 and the stationary contact part 300 due to the separation, thereby avoiding arc damage.
First embodiment
As shown in fig. 4, in the structure of the arc extinguishing device in this embodiment, in conjunction with fig. 1 to 3, the arc extinguishing chamber 500 is made of an insulating material and is rotatably connected to the housing 100, and the arc extinguishing chamber 500 includes a stirring portion 510 and an arc extinguishing portion 520, a gap G is provided between the stirring portion 510 and the arc extinguishing portion 520, and the movable contact portion 200 rotates to the gap G and drives the stirring portion 510 and the arc extinguishing portion 520 to rotate, and the arc extinguishing portion 520 is inserted between the movable contact portion 200 and the stationary contact portion 300 to extinguish arc.
Preferably, the arc extinguishing part 520 has a U shape and is connected to the striking part 510, and a space formed between the striking part 510 and the arc extinguishing part 520 forms a housing accommodating the movable contact part 200. When the switch is closed, the arc-extinguishing chamber 500 is located at one side of the movable contact portion 200, and when the switch is opened, the movable contact portion 200 toggles the toggling portion 510 to drive the arc-extinguishing chamber 500 to rotate, and as the movable contact portion 200 gradually enters a space formed between the toggling portion 510 and the arc-extinguishing portion 520, the arc-extinguishing chamber 500 gradually covers the movable contact portion 200, so as to achieve the purpose of preventing electric arcs between the movable contact portion 200 and the stationary contact portion 300.
Specifically, the arc chute 500 is rotatably coupled to the case 100 through the coupling part 540. When the movable contact part 200 rotates away from the stationary contact part 300, the toggle part 510 is toggled, so that the arc extinguishing part 520 rotates from the initial position to the arc extinguishing position. The hole in the connection 540 may be a clearance fit with the rotating shaft so that the arc chute 500 may freely rotate about the rotating shaft.
The stirring portion 510 and the arc extinguishing portion 520 are both connected to the connecting portion 540, the arc extinguishing portion 520 includes a bottom wall 521, and the bottom wall 521 is arc-shaped with respect to the stirring portion 510.
In the process from opening to closing, the movable contact portion 200 and the stationary contact portion 300 rotate counterclockwise, and at this time, the movable contact portion 200 no longer applies force to the toggle portion 510. Since the arc extinguishing chamber 500 is heavier at the side having the arc extinguishing portion 520, the arc extinguishing chamber 500 is rotated clockwise by gravity, the movable contact portion 200 gradually withdraws from the space formed between the arc extinguishing portion 520 and the striking portion 510, the movable contact portion 200 contacts the stationary contact portion 300, closing is completed, and the arc extinguishing chamber 500 is restored to a state at one side of the movable contact portion 200.
Second embodiment
Referring to fig. 5 to 7, in the present embodiment, the arc extinguishing chamber 700 includes a first arc extinguishing chamber 710 and a second arc extinguishing chamber 720, the first arc extinguishing chamber 710 is connected to the housing 100, the second arc extinguishing chamber 720 is sleeved on the movable contact portion 200, and when the switch is opened, the second arc extinguishing chamber 720 moves and is in butt joint with the first arc extinguishing chamber 710 so as to cover the movable contact portion 200, thereby rapidly cutting off an arc generated between the movable contact portion 200 and the stationary contact portion 300, and avoiding arc hazard.
In this connection, referring to fig. 8, the movable contact portion 200 is rotatably connected to the housing 100 by a movable contact connecting arm. Specifically, the miniature circuit breaker 10 further includes an incoming line end 400, a kick assembly, and a moving contact assembly 600. The movable contact assembly 600 includes an arcuate access member 610 and a movable contact member 620. The arcuate access 610 is, for example, a copper conductive member, and is configured to electrically connect with the wire inlet end 400, and includes a first arcuate portion 611, where the first arcuate portion 611 is electrically connected with the wire inlet end 400. The movable contact piece 620 is, for example, a copper conductive piece, and includes a second arc-shaped portion 621, a movable contact connecting arm 622, and a movable contact portion 200, which are sequentially connected, that is, the second arc-shaped portion 621 and the movable contact portion 200 are respectively connected at both ends of the movable contact connecting arm 622. The second arc portion 621 is disposed corresponding to the first arc portion 611 of the arc access member 610, i.e., the second arc portion 621 is connected with the first arc portion 611 to pass electricity through the second arc portion 621, the movable contact connecting arm 622, and to the movable contact portion 200 in order. The second arc portion 621 of the movable contact 620 can rotate relative to the first arc portion 611 of the arc-shaped access member 610, and when the second arc portion 621 of the movable contact 620 rotates relative to the first arc portion 611 of the arc-shaped access member 610, the movable contact 200 at the other end of the movable contact 620 is driven to be attached to or detached from the stationary contact 300. In the above embodiment, the movable contact portion 200 and the movable contact member including the movable contact portion may be provided in the above-described form.
The second arc extinguishing chamber 720 includes a housing portion 721, and the housing portion 721 is sleeved on the movable contact portion 200 through a movable contact connecting arm 622 and is movable along the movable contact connecting arm 622 to separate from or cover the movable contact portion 200 when the movable contact portion 200 rotates.
The second arc extinguishing chamber 720 further includes a housing connection part 722, the housing part 721 is connected to the housing 100 through the housing connection part 722, and both ends of the housing connection part 722 are hinged to the housing 100 and the housing part 721, respectively. When the movable contact portion 200 rotates clockwise to leave the stationary contact portion 300, the cover portion 721 moves leftward, i.e., in the direction of the movable contact portion 200, by the movable contact connecting arm 622 and the cover connecting portion 722, and gradually covers the movable contact portion 200. When the movable contact point 200 rotates counterclockwise to approach the stationary contact point 300, the cover 721 moves rightward by the movable contact point 200 and the cover connecting portion 722, i.e., moves in the opposite direction to the direction in which the movable contact point 200 is located, gradually moves away from the movable contact point 200 and moves to the movable contact point connecting arm 622, and the movable contact point 200 and the stationary contact point 300 contact each other.
As shown in fig. 8, the housing portion 721 includes a housing front wall 721a, a housing rear wall 721b, and a housing connecting wall 721c, the housing connecting wall 721c connecting the housing front wall 721a and the housing rear wall 721b, and the housing front wall 721a and the housing rear wall 721b have a through hole a through which the movable contact portion 200 and the movable contact connecting arm 622 pass.
The first arc chute 710 corresponds to the housing front wall 721a of the housing portion 721 of the second arc chute 720. When closing, the movable contact part 200 passes through the passing hole a on the front wall 721a of the cover body and contacts the stationary contact part 300; when the switch is opened, the movable contact portion 200 is retracted and passes through the through hole a on the front cover wall 721a, so that the cover body 721 covers the movable contact portion 200, and the first arc extinguishing chamber 710 is abutted against the front cover wall 721a of the second arc extinguishing chamber 720 to block the through hole a on the front cover wall 721a, and the arc extinguishing chamber 700 completely covers the movable contact portion 200 to isolate the movable contact portion 200 from the stationary contact portion 300 for arc extinguishing.
Of course, only the cover connecting wall 721c may be provided, and the cover front wall 721a and the cover rear wall 721b may not be provided, and the holes in front of and behind the cover connecting wall 721c may be formed as the passage holes a through which the movable contact portion 200 and the movable contact connecting arm 622 pass.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. The arc extinguishing device is applied to a miniature circuit breaker, and comprises a shell, a movable contact part and a fixed contact part, wherein the movable contact part and the fixed contact part are respectively connected with the shell, and the movable contact part rotates to be contacted with or separated from the fixed contact part;
the second arc-extinguishing cover is sleeved on the movable contact point part, moves and is in butt joint with the first arc-extinguishing cover when the switch is opened, the movable contact point part is rotationally connected to the shell through a movable contact point connecting arm, and the second arc-extinguishing cover comprises a cover body part which is sleeved on the movable contact point part through the movable contact point connecting arm and can move along the movable contact point connecting arm to leave or cover the movable contact point part;
the cover body part comprises a cover body front wall and a cover body connecting wall connected to the cover body front wall, the cover body front wall is provided with a passing hole for the movable contact part to pass through, the first arc-extinguishing cover corresponds to the cover body front wall, and when the switch is opened, the first arc-extinguishing cover is in butt joint with the cover body front wall.
2. The arc extinguishing device according to claim 1, wherein the second arc extinguishing chamber further comprises a cover connecting portion, and both sides of the cover connecting portion are hinged to the housing and the cover portion, respectively.
3. A miniature circuit breaker comprising a housing, a movable contact portion and a stationary contact portion connected to the housing, respectively, and an arc extinguishing device, the movable contact portion being rotated to be in contact with or separated from the stationary contact portion, characterized in that the arc extinguishing device is an arc extinguishing device according to any one of claims 1 to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710414841.0A CN108987208B (en) | 2017-06-05 | 2017-06-05 | Miniature circuit breaker and arc extinguishing device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710414841.0A CN108987208B (en) | 2017-06-05 | 2017-06-05 | Miniature circuit breaker and arc extinguishing device thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108987208A CN108987208A (en) | 2018-12-11 |
| CN108987208B true CN108987208B (en) | 2024-04-02 |
Family
ID=64501811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710414841.0A Active CN108987208B (en) | 2017-06-05 | 2017-06-05 | Miniature circuit breaker and arc extinguishing device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108987208B (en) |
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| CN206961782U (en) * | 2017-06-05 | 2018-02-02 | 周思雨 | A kind of miniature circuit breaker and its arc-control device |
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2017
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Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5581063A (en) * | 1995-06-26 | 1996-12-03 | Square D Company | Arc-resistant shield for protecting a movable contact carrier of a circuit breaker |
| EP1523020A1 (en) * | 2003-10-10 | 2005-04-13 | Moeller GmbH | Switching device with a single break rotary contact |
| JP2005235670A (en) * | 2004-02-23 | 2005-09-02 | Matsushita Electric Works Ltd | Circuit breaker |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108987208A (en) | 2018-12-11 |
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