CN102427008B - Arc-extinguishing device for plastic shell low-voltage circuit breaker - Google Patents
Arc-extinguishing device for plastic shell low-voltage circuit breaker Download PDFInfo
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- CN102427008B CN102427008B CN201110349014.0A CN201110349014A CN102427008B CN 102427008 B CN102427008 B CN 102427008B CN 201110349014 A CN201110349014 A CN 201110349014A CN 102427008 B CN102427008 B CN 102427008B
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Abstract
The invention discloses an arc-extinguishing device for a plastic shell low-voltage circuit breaker. An air outlet is formed in the front wall of an arc-extinguishing chamber; a back opening is formed in the back wall of the arc-extinguishing chamber; the front end of a movable contact is extended into the inner cavity of the arc-extinguishing chamber from the external through the back opening and is connected with a movable contact plastic piece; the upper part of the movable contact plastic piece is fixedly connected with the movable contact; the lower part of the movable contact plastic piece is an elastic bending lug boss which is extended downwards from the back part of the upper part and is upwards bent towards the contact direction of the movable contact; included angles are formed between the initial position of the elastic bending lug boss and the horizontal direction, and between the initial position of the elastic bending boss and the movable contact; a lug boss which is extended upwards from the internal of the back opening is formed on the lower part of the back wall of the arc-extinguishing chamber; the sizes of the lug boss and the elastic bending lug boss in the left-and-right width direction are consistent with the size of the back; when the movable contact is detached to the bottom, the elastic bending lug boss is positioned above the lug boss and blocks a part of the back opening; therefore, an air blowing effect of the arc-extinguishing chamber is increased, and the switch-on and switch-off of the circuit breaker are effectively improved.
Description
Technical field
The present invention relates to a kind of case low-voltage circuit breaker of moulding, be specifically related to mould the arc-control device of case low-voltage circuit breaker, belong to the low-voltage electrical technical field.
Background technology
The arc control device of existing breaker of plastic casing generally all are comprised of arc extinguishing grid pieces and gas exhausted material.When circuit breaker cut-offs, dynamic/static contact is scolded out, and produces electric arc.Because the moving line of moving contact contact is in the cavity volume of the arc extinguishing grid pieces of arc-control device, therefore electric arc enters arc extinguishing grid pieces under electrodynamic action, arc extinguishing grid pieces cuts into electric arc the short arc of a series of series connection, electric arc is attenuated and improve fast arc voltage, thereby reaching the effect of arc extinguishing.Simultaneously, when gas exhausted material cut-offs at circuit breaker, can produce gas, form certain air-blowing, at gas, in the process of arc control device gas outlet motion, electric arc be blowed to the direction of grid sheet.But because an opening that provides moving contact to enter the arc control device motion is provided at the arc control device rear portion, in the process of arc control device gas blast arc-quenching, the gas of some is towards this rear aperture direction motion, cause the decline of whole arc control device blast pressure, weaken the air-blowing effect, be unfavorable for improving the arc extinction performance of circuit breaker.And, when circuit breaker cut-offs, due to the blast pressure insufficient strength, the metallic that electric arc or electrical arc erosion contact produce can be attached on the grid sheet, causes the short circuit between the grid sheet, reduces the break performance of circuit breaker.Gas in arc control device can blow out together with the part metals particle while blowing out towards the arc control device rear aperture, can make like this dielectric strength of the arc control device Background Region of whole circuit breaker reduce, and causes to cut-off the withstand voltage of rear circuit breaker and cannot pass through.
For addressing the above problem, the Patent Application Publication that publication number is CN102184814A a kind of arc-control device of breaker of plastic casing, moving contact working of plastics forward part is extended to the back lower place and is bent with a rear portion boss; At moving contact, scold in open procedure, this rear portion boss moves to the position that blocks rear aperture with moving contact, can block the rear aperture of arc control device, strengthen the air pressure in arc control device, strengthen the air-blowing effect in arc control device, effectively promote the disjunction of breaker of plastic casing, strengthen current limiting performance.But the defect of this structure is: bending angle and the bending shape of rear portion boss are fixed, do not there is elasticity, namely this boss just only has a kind of stationary state all the time, can not be out of shape with the generation of air-blowing in arc control device, so relatively high to the requirement of the size of this rear portion boss and bending angle.If the dimensioned of rear portion boss is not accurate, this rear portion boss will touch the rotating shaft of base or circuit breaker in breaker closing so, causes circuit breaker normally to close a floodgate; If the bending angle of rear portion boss is not accurate, can cause this kind of structure moving contact move to while scolding open position the rear portion boss can not the shutoff arc control device after opening not, thereby cause gas still can move towards the direction of arc control device rear aperture, blast pressure in arc control device is descended, reduce the break performance of circuit breaker.
Summary of the invention
In order to solve existing defect in current arc control device plugging structure, the present invention aims to provide a kind of device of effective shutoff arc control device rear aperture, strengthen the inner blast pressure of arc control device, the gas that in arc control device, gas exhausted material produces is moved towards the direction of the front gas outlet of arc control device as far as possible, so just being conducive to electric arc moves to the grid panel region, thereby utilize more efficiently the air-blowing effect of gas exhausted material generation, effectively improve the interrupting performance of breaker of plastic casing, strengthen the current limiting performance of circuit breaker.Gas can strengthen the dielectric strength of the arc control device Background Region of whole circuit breaker effectively towards the direction motion of the front gas outlet of arc control device, guarantees to divide the withstand voltage of circuit breaker of having no progeny.
The technical solution used in the present invention is: the arc control device with a cavity body structure, the antetheca of arc control device is provided with gas outlet, the rear wall of arc control device is provided with a rear aperture, the moving contact front end stretches into the arc control device inner chamber from outside by this rear aperture, the moving contact front end connects a moving contact working of plastics, the upper part of moving contact working of plastics is fixedly connected with moving contact, the lower part of moving contact working of plastics is to be extended downwards and towards make progress an elasticity bending boss of bending of moving contact contact direction by the rear portion of upper part, the initial position of elasticity bending boss has angle respectively and between horizontal direction and moving contact, the bottom of arc control device rear wall is provided with the boss extended upward from the inside of rear aperture, boss is all consistent with rear aperture with the size of elasticity bending boss on the Width of left and right, is provided with one at the front end of elasticity bending boss and scolds the bending angle of evolution to bending to moving contact, at circuit breaker, during in "on" position, elasticity bending boss is depressed into horizontal level by moving contact and is supported on boss, scold and reach the end during state at moving contact, elasticity bending boss is positioned at the top occluding member rear aperture of boss.
The invention has the beneficial effects as follows:
1, the moving contact working of plastics is enclosed within the moving contact outside, along with scolding out of moving contact, working of plastics is followed moving contact and is moved together, and the distortion of working of plastics elasticity bending boss can block the rear aperture of arc control device to greatest extent, strengthen the air pressure in arc control device, strengthen the air-blowing effect in arc control device.
2, the elasticity boss of moving contact working of plastics below due to the air-blowing distortion after, can make the air-flow of pouring into fast the arc control device rear aperture in arc-control device be blocked, and resilience changes route, front gas outlet direction motion towards arc control device, in this course, air-blowing is conducive to electric arc to the motion of grid panel region, can effectively promote cut-offfing of breaker of plastic casing, strengthens current limiting performance.
3, in interrupting process, this structure can occluding member arc control device rear aperture, strengthens air-blowing.After disjunction finishes, the elasticity bending boss in this structure can return to initial condition, guarantees the normal combined floodgate of circuit breaker.
4, circuit breaker during elasticity bending boss can extend the arc control device inner chamber when closing a floodgate in this structure, thus again normally closing a floodgate of circuit breaker guaranteed.
5, the present invention's easy realization simple in structure, easy for installation.
The accompanying drawing explanation
?below by by reference to the accompanying drawings with shown in infinite example to explanation preferred but not exclusive embodiment, can have a clear understanding of further characteristic of the present invention and advantage.
Show compactly structure of the present invention for more clear, omitted the parts such as rotating shaft in conventional breaker of plastic casing arc-control device and spring in accompanying drawing.
Fig. 1 is that moving contact working of plastics 1 of the present invention is when initial condition and the assembly structure figure of moving contact 3;
Fig. 2 be in Fig. 1 moving contact working of plastics 1 at the amplification assumption diagram of initial condition;
Fig. 3 is that in the present invention, state diagram is analysed and observe in the side of moving contact 3 in making process;
Fig. 4 is that state diagram is analysed and observe in circuit breaker side of the present invention when closing position;
Fig. 5 is the state diagram of circuit breaker when closing position;
Fig. 6 is the state diagram of circuit breaker when open position;
Fig. 7 is that state diagram is analysed and observe in circuit breaker side of the present invention when open position;
In figure: 1. moving contact working of plastics; 2. arc control device; 3. moving contact; 11. elasticity bending boss; 21. gas outlet; 22. rear aperture; 23. boss; 111. bending angle.
Embodiment
Referring to Fig. 3 to shown in Fig. 7, the present invention has arc control device 2, and arc control device 2 are a kind of cavity body structures, are provided with gas outlet 21 on the antetheca of arc control device 2, offer a rear aperture 22 on the rear wall of arc control device 2, rear aperture 22 makes way for moving up and down that moving contact 3 does when divide-shut brake.In arc control device 2, in the bottom of arc control device 2 rear walls, be provided with boss 23.Boss 23 and the consistent size of rear aperture 22 on left and right directions, boss 23 is to extend the boss of certain altitude to the top of opening from the inside of rear aperture 22, boss 23 can play 2 effects, and the firstth, the area of minimizing arc control device 2 rear aperture 22, the secondth, supporting role: due to the elasticity bending boss 11 on moving contact working of plastics 1, certain angle is arranged and there is elasticity when the initial condition, elasticity bending boss 11 is extended in arc control device 2 in level and by rear aperture 22 when moving contact 3 "on" position, just require moving contact 3 to rely on the pressure straight down of self to make elasticity bending boss 11 arrive the state shown in Fig. 4, boss 23 in this process on arc control device 2 can also play the effect of supporting the elasticity bending boss 11 on moving contact working of plastics 1, guarantee that elasticity bending boss 11 can arrive the position shown in Fig. 4.Moving contact 3 front ends stretch into arc control device 2 inner chambers from outside by this rear aperture 22, and in breaker open operation and making process, moving contact 3 moves up and down along rear aperture 22.
Shown in Fig. 1 and 2, the present invention connects a moving contact working of plastics 1 at moving contact 3 front ends, and moving contact working of plastics 1 is divided into upper and lower two parts.Upper part is in order to be fixedly connected with moving contact 3.The lower part of moving contact working of plastics 1 is to extend an also elasticity bending boss 11 of bending downwards by the rear portion of upper part, the wrap direction of elasticity bending boss 11 is the bendings that make progress of the direction towards the contact of moving contact 3, elasticity bending boss 11 and the consistent size of rear aperture 22 on the Width of left and right.Between the initial position of elasticity bending boss 11 and horizontal direction and moving contact 3, certain angle is all arranged.Be provided with one near the position of moving contact at the front end of elasticity bending boss 11 and scold the bending angle 111 of evolution to the bending certain angle to moving contact 3.When moving contact 3 closes a floodgate, bending angle 111 can guarantee that elasticity bending boss 11 is smoothly by the boss 23 on arc control device 2 rear walls.As shown in Figure 3, in moving contact 3 making processes, elasticity bending boss 11 starts to rely on the downforce of moving contact 3 to be pressed down from initial condition, when bending leg 111 has just started to touch with boss 23, because it has certain round and smooth excessive bending angle, so can make it streak the boss 23 on arc control device 2, reduce the frictional force between the boss 23 on elasticity bending boss 11 and arc control device 2, guarantee the normal combined floodgate of circuit breaker.If the boss 23 that elasticity bending boss 11 is encountered on the arc control device rear wall will cause moving contact 3 to be stuck, circuit breaker can not normally be closed a floodgate.
As shown in Figures 4 and 5, when circuit breaker during in "on" position, by moving contact 3, pressure straight down is pressed onto illustrated state to elasticity bending boss 11 on moving contact working of plastics 1, and now the rear section of moving contact 3 is positioned at outside rear aperture 22, and approaches horizontal level.Elasticity bending boss 11 extends in the cavity volume of rear aperture 23 inside and approaches horizontal level.Can guarantee that like this moving contact 3 is when "on" position, the elasticity bending boss 11 on moving contact working of plastics 1 can not touch mutually with the base of circuit breaker or the rotating shaft of circuit breaker, makes circuit breaker in normal "on" position.
As shown in Fig. 6 and Fig. 7, in moving contact 3 is scolded open procedure, when first scolding out because of moving contact 3, the bottom elasticity bending boss 11 of moving contact working of plastics 1 press pressure thereon to disappear, be released the initial condition of getting back to elasticity bending boss 11, then because air-blowing launches backward, and the rear aperture 22 of arc control device 2 has been blocked to greatest extent with shutoff in the motion of scolding out of following moving contact 3.The below elasticity bending boss 11 of moving contact working of plastics 1 is out of shape until disjunction finishes backward because the air-blowing power of the gas of gas exhausted material generation is unfolded.When moving contact 3, scold while reaching the end, the rear elastic boss 11 of moving contact working of plastics 1 shelters from part rear aperture 22, has reduced the gas effusion area of the rear aperture 22 of arc control device.When moving contact 3 is scolded out this state, the bending leg 111 on elasticity bending boss 11 is positioned at the top of the boss 23 of arc control device 2, guarantees again normally closing a floodgate of moving contact 3.When circuit breaker cut-offs, the gas part that the inner gas exhausted material of arc control device produces is towards 22 motions of arc control device rear aperture, and after touching elasticity bending boss 11, the gas resilience of rapid movement also changes route, and gas is discharged by gas outlet 21.Improve the rate of climb of arc control device 2 air pressure inside within the extremely short time, made gas pass through gas outlet 21 as far as possible and discharge, can effectively change towards the gas direction of arc control device 2 rear aperture 22 motions, like this, be conducive to strengthen the air-blowing effect of arc control device 2 inside.In the arc control device internal gas is discharged the process of motion towards gas outlet 21, be conducive to electric arc to the motion of grid sheet direction, gas drives electric arc towards the arc extinguishing grid pieces regional movement in arc control device, and electric arc is comparatively fast extinguished, and can effectively strengthen the interrupting performance of circuit breaker.Gas is discharged by gas outlet 21, also can guarantee the dielectric strength of the arc control device Background Region of circuit breaker.Simultaneously, the design of this elasticity bending structure of moving contact working of plastics 1 can guarantee to be unlikely to touch circuit breaker base in the motion process of moving contact 3 or rotating shaft causes circuit breaker normally to close a floodgate.After disjunction finishes, the below elasticity bending boss 11 of moving contact working of plastics 1 can rely on the strain of self to return to state as shown in Figure 1 again, the bending angle 111 in elasticity bending boss 11 the place aheads can guarantee that elasticity bending boss 11 is smoothly by the boss 23 on arc control device 2 rear walls, thereby guarantees the reliable combined floodgate of circuit breaker.The present invention is simple in structure, easy for installation, has effectively solved existing problem in current arc-extinguishing chamber of circuit breaker plugging structure.
Claims (1)
1. an arc-control device of moulding case low-voltage circuit breaker, arc control device (2) with a cavity body structure, the antetheca of arc control device (2) is provided with gas outlet (21), the rear wall of arc control device (2) is provided with a rear aperture (22), moving contact (3) front end stretches into arc control device (2) inner chamber from outside by this rear aperture (22), and moving contact (3) front end connects a moving contact working of plastics (1), the upper part of moving contact working of plastics (1) is fixedly connected with moving contact (3), it is characterized in that: the lower part of moving contact working of plastics (1) is to be extended downwards and towards the make progress elasticity bending boss (11) of bending of moving contact (3) contact direction by the rear portion of upper part, the initial position of elasticity bending boss (11) has angle respectively and between horizontal direction and moving contact (3), the bottom of arc control device (2) rear wall is provided with the boss (23) extended upward from the inside of rear aperture (22), boss (23) is all consistent with rear aperture (22) with the size of elasticity bending boss (11) on Width, is provided with one at the front end of elasticity bending boss (11) and scolds the bending angle (111) of evolution to bending to moving contact (3), at circuit breaker, during in "on" position, elasticity bending boss (11) is depressed into horizontal level by moving contact (3) and is supported on boss (23), scold and reach the end during state at moving contact (3), elasticity bending boss (11) is positioned at the top occluding member rear aperture (22) of boss (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110349014.0A CN102427008B (en) | 2011-11-08 | 2011-11-08 | Arc-extinguishing device for plastic shell low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110349014.0A CN102427008B (en) | 2011-11-08 | 2011-11-08 | Arc-extinguishing device for plastic shell low-voltage circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102427008A CN102427008A (en) | 2012-04-25 |
| CN102427008B true CN102427008B (en) | 2014-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110349014.0A Active CN102427008B (en) | 2011-11-08 | 2011-11-08 | Arc-extinguishing device for plastic shell low-voltage circuit breaker |
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| Country | Link |
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| CN (1) | CN102427008B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304424A (en) * | 2015-11-12 | 2016-02-03 | 天津市百利电气有限公司 | Molded case circuit breaker with semi-closed arc extinguishing chamber |
| CN107045967B (en) * | 2016-02-05 | 2019-08-20 | 上海良信电器股份有限公司 | A kind of arc-extinguishing chamber of circuit breaker sealing structure |
| CN107068508B (en) * | 2017-05-22 | 2019-08-27 | 浙江人民电器有限公司 | A kind of breaker |
| JP6832814B2 (en) * | 2017-09-01 | 2021-02-24 | 三菱電機株式会社 | Circuit breaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006294511A (en) * | 2005-04-13 | 2006-10-26 | Fuji Electric Fa Components & Systems Co Ltd | Circuit breaker |
| KR200446765Y1 (en) * | 2007-11-02 | 2009-12-03 | 엘에스산전 주식회사 | Arc shielding apparatus for mold cased circuit breaker |
| CN102064055A (en) * | 2011-01-21 | 2011-05-18 | 西安交通大学 | Contact system of circuit breaker |
| CN102184814A (en) * | 2011-05-03 | 2011-09-14 | 江苏辉能电气有限公司 | Arc extinguishing equipment of moulded case circuit breaker |
-
2011
- 2011-11-08 CN CN201110349014.0A patent/CN102427008B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006294511A (en) * | 2005-04-13 | 2006-10-26 | Fuji Electric Fa Components & Systems Co Ltd | Circuit breaker |
| KR200446765Y1 (en) * | 2007-11-02 | 2009-12-03 | 엘에스산전 주식회사 | Arc shielding apparatus for mold cased circuit breaker |
| CN102064055A (en) * | 2011-01-21 | 2011-05-18 | 西安交通大学 | Contact system of circuit breaker |
| CN102184814A (en) * | 2011-05-03 | 2011-09-14 | 江苏辉能电气有限公司 | Arc extinguishing equipment of moulded case circuit breaker |
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| Publication number | Publication date |
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| CN102427008A (en) | 2012-04-25 |
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Effective date of registration: 20220513 Address after: 212132 No. 97, Wufengshan Road, Dagang, New District, Zhenjiang City, Jiangsu Province Patentee after: Huineng low voltage electric appliance (Jiangsu) Co.,Ltd. Address before: 212132 No. 97, Wufengshan Road, Dagang, New District, Zhenjiang City, Jiangsu Province Patentee before: Jiangsu Phono Electric Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 212132 No. 97, Wufengshan Road, Dagang, New District, Zhenjiang City, Jiangsu Province Patentee after: Eaton Huineng low voltage electrical appliances (Jiangsu) Co.,Ltd. Address before: 212132 No. 97, Wufengshan Road, Dagang, New District, Zhenjiang City, Jiangsu Province Patentee before: Huineng low voltage electric appliance (Jiangsu) Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |