CN102420082B - Device for preventing moving contact of moulded case circuit breaker from falling - Google Patents
Device for preventing moving contact of moulded case circuit breaker from falling Download PDFInfo
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- CN102420082B CN102420082B CN201110226641.5A CN201110226641A CN102420082B CN 102420082 B CN102420082 B CN 102420082B CN 201110226641 A CN201110226641 A CN 201110226641A CN 102420082 B CN102420082 B CN 102420082B
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- moving contact
- pivot pin
- circuit breaker
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Abstract
The present invention discloses a kind of device for preventing moving contact of moulded case circuit breaker from falling, the moving contact that it inner chamber comprising contact rotating shaft and be installed on contact rotating shaft also can rotate around contact spindle central, the lower edge of described moving contact is provided with cam surface, described contact rotating shaft is fixed with pivot pin, described pivot pin is provided with centered by moving contact two touch springs, one end of described touch spring is that stiff end is connected on pivot pin, the other end is that movable end connects mobile pivot pin, described mobile pivot pin is installed in chute that contact rotating shaft is offered, and be pressed over all the time on cam surface under the active force of touch spring.Above-mentioned device for preventing moving contact of moulded case circuit breaker from falling is when fault current flows through circuit breaker, moving contact overcomes touch spring counter-force to start to scold out, finally make the active force of touch spring be in contact scold evolution to, effectively can prevent the phenomenon that moving contact contact in breaking course falls; And quick disjunction can be realized; Improve the breaking capacity of circuit breaker.
Description
Technical field
The present invention relates to a kind of moving contact of plastic-shell circuit breaker, particularly relate to a kind of device for preventing moving contact of moulded case circuit breaker from falling.
Background technology
In the contact system of breaker of plastic casing, always include one or one group of touch spring to produce the contact pressure between dynamic and static contact, to ensure that contact has enough contacts to make the resistance of contact point be small enough to make the temperature rise of circuit breaker within the scope of national Specification thus ensures the safety applications of circuit breaker when closed.
At present, breaker of plastic casing is as the branch stage distribution apparatus of distribution system, and along with the continuous increase of net capacity and the needs of centralized power distribution, its breaking capacity of system requirements is more and more higher, so the extensive use in breaker of plastic casing of current-limiting type structure of contact terminal.But the opening force of scolding of its contact of current-limiting type structure of contact terminal is determined by the electric current between this contact, namely when current value increases to certain value, dynamic, fixed contact starts to scold out under loop electric power and the electrodynamic effect simultaneously of node, resistance now between contact increases fast and the mechanical periodicity of alternating current can cause the electricity Liu Suo flowed through between contact before circuit breaker cut-offs to reduce to electric power to be less than dynamic, the situation of opening force is scolded between fixed contact, at this moment, before by the contact of scolding out along with electrodynamic minimizing will be moved from scolding open position to make position direction, namely so-called contact is caused to fall phenomenon, contact falls and can cause restriking of electric arc between contact and fault current can not be cut-off.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of device for preventing moving contact of moulded case circuit breaker from falling, its phenomenon that can effectively prevent moving contact contact in breaking course from falling, realize quick disjunction; Improve the breaking capacity of circuit breaker.
The object of the invention is to be achieved through the following technical solutions:
A kind of device for preventing moving contact of moulded case circuit breaker from falling, the moving contact that it inner chamber comprising contact rotating shaft and be installed on contact rotating shaft also can rotate around contact spindle central, wherein, the lower edge of described moving contact is provided with cam surface, described contact rotating shaft is fixed with pivot pin, described pivot pin is provided with centered by moving contact two touch springs, one end of described touch spring is that stiff end is connected on pivot pin, the other end is that movable end connects mobile pivot pin, described mobile pivot pin is installed in chute that contact rotating shaft is offered, and be pressed over all the time on cam surface under the active force of touch spring.
Especially, described moving contact has groove in the both sides of cam surface.
Especially, described cam surface is that boundary is divided into leading portion stroke and back segment stroke with summit, and the gradient of described back segment stroke is greater than the gradient of leading portion stroke.
Beneficial effect of the present invention is, the moving contact of described device for preventing moving contact of moulded case circuit breaker from falling passes to the rated current of circuit breaker in closed state, the line of action of touch spring power is positioned at the outside of contact point and contact spindle central, and the direction of its moment makes the contact point of contact produce operating pressure, and when fault current flows through circuit breaker, dynamic, fixed contact overcomes touch spring counter-force under loop electric power and the electrodynamic effect simultaneously of node to start to scold out, finally make the direction of touch spring active force by contact spindle central and between moving contact contact and contact spindle central, now the active force of touch spring be in contact scold evolution to, even if fault current is less than touch spring counter-force because certain Yuan reduces to electrodynamic repulsion force Yin Suo, also moving contact can be remained on because of the change in touch spring counter-force direction and scold open position and make contact continue to the motion of disconnection direction and can not fall.Effectively can prevent the phenomenon that moving contact contact in breaking course falls; And quick disjunction can be realized; Improve the breaking capacity of circuit breaker.
Accompanying drawing explanation
According to drawings and embodiments the present invention is described in further detail below.
Fig. 1 is the structural representation of device for preventing moving contact of moulded case circuit breaker from falling of the present invention;
Fig. 2 is the profile of the moving contact of device for preventing moving contact of moulded case circuit breaker from falling of the present invention;
Fig. 3 is the schematic diagram that device for preventing moving contact of moulded case circuit breaker from falling of the present invention is in closure state;
Fig. 4 is device for preventing moving contact of moulded case circuit breaker from falling of the present invention scolds in open procedure schematic diagram at moving contact;
Fig. 5 is that device for preventing moving contact of moulded case circuit breaker from falling of the present invention is in the schematic diagram of scolding open state.
In figure:
1, contact rotating shaft; 2, moving contact; 20, cam surface; 21, installing hole; 22, leading portion stroke; 23, back segment stroke; 24, groove; 3, contact bearing pin; 4, pivot pin; 5, touch spring; 6, chute; 7, mobile pivot pin.
Embodiment
Please refer to shown in Fig. 1 and Fig. 3, in the present embodiment, a kind of device for preventing moving contact of moulded case circuit breaker from falling comprises the contact rotating shaft 1 with inner chamber, the center of described contact rotating shaft 1 is provided with contact pivot pin 3, described moving contact 2 offers installing hole 21, by installing hole 21, moving contact is installed on contact pivot pin 3, and can around the center rotating of contact rotating shaft 1, described moving contact 2 is arranged in the inner chamber of contact rotating shaft 1, the contact that moving contact 2 contacts with corresponding fixed contact (not illustrating in figure) is stretched out outside the inner chamber of contact rotating shaft 1, and the lower edge of described moving contact 2 is provided with cam surface 20, described moving contact 2 has groove 24 in the both sides of cam surface 20.
Described contact rotating shaft 1 is also fixed with pivot pin 4, described pivot pin 4 is provided with two touch springs 5 centered by moving contact 2, one end of described touch spring 5 is that stiff end is connected on pivot pin 4, the other end is that movable end connects mobile pivot pin 7, described mobile pivot pin 7 is installed in chute 6 that contact rotating shaft 1 is offered, described mobile pivot pin 7 moves along chute 6 under the drive of touch spring 5, and is pressed over all the time on cam surface 20 under the active force of touch spring 5.
Described cam surface 20 is that boundary is divided into leading portion stroke 22 and back segment stroke 23 with summit, the gradient of described back segment stroke 23 is greater than the gradient of leading portion stroke 22, when crossing the summit of cam surface 20 to make mobile pivot pin 7, can fall into fast under the effect of touch spring 5 in the groove 24 of back segment stroke 23 side.
Refer to shown in Fig. 3 to Fig. 5, during normal work, the moving contact 2 of described device for preventing moving contact of moulded case circuit breaker from falling passes to the rated current of circuit breaker in closed state, the line of action of touch spring 3 is positioned at the outside at moving contact 2 contact point and contact rotating shaft 1 center, and the direction of its moment makes the contact point of contact produce operating pressure; and when fault current flows through circuit breaker, the counter-force that moving contact 2 and fixed contact (not illustrating in figure) overcome touch spring 3 under loop electric power and the electrodynamic effect simultaneously of node starts to scold out, when moving contact 2 scold reach desired design scold open position, the motion of scolding out of moving contact 2 makes the force direction of touch spring 3 constantly change along with mobile pivot pin 7 and the shape of moving contact 2 contacting points position along cam surface 20, when the summit of cam surface 20 crossed by mobile pivot pin 7, the direction of touch spring 3 active force is by contact rotating shaft 1 center and between moving contact 2 contact and contact rotating shaft 1 center, now the active force of touch spring 3 be in contact scold evolution to, even if now fault current is less than touch spring 3 counter-force because certain Yuan reduces to electrodynamic repulsion force Yin Suo, also moving contact 2 can be remained on because of the change in touch spring 3 counter-force direction to scold open position and in the groove 24 that the effect of touch spring 3 falls into back segment stroke 23 side, effectively can prevent the phenomenon that moving contact contact in breaking course falls, and quick disjunction can be realized, improve the breaking capacity of circuit breaker.
Claims (2)
1. a device for preventing moving contact of moulded case circuit breaker from falling, the moving contact that it inner chamber comprising contact rotating shaft and be installed on contact rotating shaft also can rotate around contact spindle central, it is characterized in that: the lower edge of described moving contact is provided with cam surface, described contact rotating shaft is fixed with pivot pin, described pivot pin is provided with centered by moving contact two touch springs, one end of described touch spring is that stiff end is connected on pivot pin, the other end is that movable end connects mobile pivot pin, described mobile pivot pin is installed in chute that contact rotating shaft is offered, and be pressed over all the time on cam surface under the active force of touch spring, both sides in cam surface on described moving contact all have groove.
2. device for preventing moving contact of moulded case circuit breaker from falling according to claim 1, is characterized in that: described cam surface is that boundary is divided into leading portion stroke and back segment stroke with summit, and the gradient of described back segment stroke is greater than the gradient of leading portion stroke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110226641.5A CN102420082B (en) | 2011-08-09 | 2011-08-09 | Device for preventing moving contact of moulded case circuit breaker from falling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110226641.5A CN102420082B (en) | 2011-08-09 | 2011-08-09 | Device for preventing moving contact of moulded case circuit breaker from falling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102420082A CN102420082A (en) | 2012-04-18 |
| CN102420082B true CN102420082B (en) | 2016-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110226641.5A Active CN102420082B (en) | 2011-08-09 | 2011-08-09 | Device for preventing moving contact of moulded case circuit breaker from falling |
Country Status (1)
| Country | Link |
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| CN (1) | CN102420082B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104576247A (en) * | 2015-01-05 | 2015-04-29 | 无锡新宏泰电器科技股份有限公司 | Falling-prevention single-break contact operation mechanism |
| CN108878230B (en) * | 2018-08-23 | 2024-04-16 | 无锡新宏泰电器科技股份有限公司 | Limiting structure of breaker contact |
| CN110211849A (en) * | 2019-04-03 | 2019-09-06 | 德力西电气有限公司 | The dropproof movable contact spring of disjunction for breaker of plastic casing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2826673Y (en) * | 2005-08-07 | 2006-10-11 | Tcl国际电工(无锡)有限公司 | Movable contact of moulded casing circuit breaker |
| CN102005314A (en) * | 2010-11-22 | 2011-04-06 | 江苏大全凯帆电器股份有限公司 | Contactor falling-resistant device |
| CN201796839U (en) * | 2010-08-20 | 2011-04-13 | 华鹏集团有限公司 | Moving contact device of low-voltage molded case circuit breaker |
| CN202189744U (en) * | 2011-08-09 | 2012-04-11 | 无锡新宏泰电器科技股份有限公司 | Device for preventing moving contact of moulded case circuit breaker from falling |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100492760B1 (en) * | 2003-05-27 | 2005-06-07 | 엘에스산전 주식회사 | Current-limiting circuit breaker |
| DE102008039187B4 (en) * | 2008-08-20 | 2019-06-19 | Siemens Aktiengesellschaft | Circuit breaker, especially for low voltage |
-
2011
- 2011-08-09 CN CN201110226641.5A patent/CN102420082B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2826673Y (en) * | 2005-08-07 | 2006-10-11 | Tcl国际电工(无锡)有限公司 | Movable contact of moulded casing circuit breaker |
| CN201796839U (en) * | 2010-08-20 | 2011-04-13 | 华鹏集团有限公司 | Moving contact device of low-voltage molded case circuit breaker |
| CN102005314A (en) * | 2010-11-22 | 2011-04-06 | 江苏大全凯帆电器股份有限公司 | Contactor falling-resistant device |
| CN202189744U (en) * | 2011-08-09 | 2012-04-11 | 无锡新宏泰电器科技股份有限公司 | Device for preventing moving contact of moulded case circuit breaker from falling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102420082A (en) | 2012-04-18 |
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