CN103021754A - Arc extinguishing system of molded case circuit breaker - Google Patents
Arc extinguishing system of molded case circuit breaker Download PDFInfo
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- CN103021754A CN103021754A CN2012105251609A CN201210525160A CN103021754A CN 103021754 A CN103021754 A CN 103021754A CN 2012105251609 A CN2012105251609 A CN 2012105251609A CN 201210525160 A CN201210525160 A CN 201210525160A CN 103021754 A CN103021754 A CN 103021754A
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Abstract
The invention discloses an arc extinguishing system of a molded case circuit breaker. An arc extinguishing chamber is in the structure formed by symmetrically splicing a left casing and a right casing, a vertically downward first groove is respectively arranged on the upper portion of the left casing and on the upper portion of the right casing, an opening of a U-shaped magnetism-enhanced block of a moving contact faces vertically downwards, and two lateral walls of the U-shaped magnetism-enhanced block of the moving contact downwards extend into the two first grooves. A vertically upward groove is respectively arranged on the lower portion of the left casing of the arc extinguishing chamber and on the lower portion of the right casing of the arc extinguishing chamber, an opening of a U-shaped magnetism-enhanced block of a fixed contact faces vertically upwards, and two lateral walls of the U-shaped magnetism-enhanced block of the fixed contact upwards extend into the two second grooves. The extreme position of the moving contact for upwards repelling is located between the two lateral walls of the U-shaped magnetism-enhanced block of the moving contact, and the highest point of the moving contact is close to but is not contacted with the top wall of the U-shaped magnetism-enhanced block of the moving contact. The U-shaped magnetism-enhanced block of the moving contact and the U-shaped magnetism-enhanced block of the fixed contact can respectively increase self-excitation magnetic fields in the moving contact area and the fixed contact area, and burning loss of the moving contact is reduced. The left casing and the right casing of the arc extinguishing chamber can be fixed, and accordingly grid sheet installation quality can be ensured.
Description
Technical field
The invention belongs to the low-voltage electrical technical field, is a kind of arc quenching system of breaker of plastic casing.
Background technology
Arc quenching system is the critical piece of breaker of plastic casing, is used for reliably rapidly extinguish arcs, with the scaling loss that reduces the contact and the interrupting performance that improves circuit breaker.The arc control device of existing breaker of plastic casing generally have two kinds of structures: the first structure is exactly the open type arc control device, in the arc control device shell, two left and right sides insulation boards and some arc extinguishing grid pieces are riveted together, the right and left at the grid sheet arranges boss, at insulation board square three-way groove is set, each sheet grating sheet is riveted after passing its corresponding square three-way groove, the defective of this arc control device is: in the riveted joint installation process, easily cause grid sheet distortion or fixing not firm with insulation board, make circuit breaker grid sheet arc cutting effectively in breaking course, cause failure of interruption.The second structure is semi-enclosed arc control device, these arc control device have two housings assembled, and internal structure is complicated, processing technology is had relatively high expectations, and the inner magnetic patch that increases that does not have the moving contact zone, be not strong self-excitation magnetic field, moving contact zone, cause the electric arc long period to corrode moving contact, make pitting of contacts serious.
Summary of the invention
For the problems referred to above, the invention provides a kind of arc quenching system of breaker of plastic casing, in the moving contact moving region, increase self-excitation magnetic field, guarantee electric arc fast transfer from the moving contact, reduce the break-time of circuit breaker; Simultaneously, also make things convenient for the installation of grid sheet, the grid sheet is installed firmly not yielding.
The technical solution used in the present invention is: comprise arc control device, fixed contact, moving contact and several arc extinguishing grid pieces, arc control device are two shell splicing constructions of left and right symmetry, the top of the left and right shell of arc control device all has the first groove vertically downward, the opening that the moving contact U-shaped of U-shaped structure increases magnetic patch towards under and the moving contact U-shaped two side that increases magnetic patch stretch downwards in two the first grooves; The bottom of the left and right shell of arc control device all has the second groove vertically upward, the opening that the fixed contact U-shaped of U-shaped structure increases magnetic patch towards directly over and the fixed contact U-shaped increase the magnetic patch two side and extend upwardly in two grooves; The fixed contact of fixed contact increases symmetrical centre place between the magnetic patch two side at the fixed contact U-shaped, the extreme position that moving contact is upwards scolded out the place the moving contact U-shaped increase between the magnetic patch two side and the moving contact peak near but be not contacted with the roof that the moving contact U-shaped increases magnetic patch.
The invention has the beneficial effects as follows:
1, the U-shaped of dynamic and static contact increases the self-excitation magnetic field that magnetic patch can increase respectively dynamic and static voltage contact area, also can fix left and right arc control device shell, formation can plug-in mounting grid sheet cavity volume, guaranteed the installation quality of grid sheets, also reduce the number of spare parts of whole system simultaneously.
2, the moving contact U-shaped increases magnetic patch and can attract electric arc, upwards attracts moving contact to scold out speed to accelerate moving contact, guarantees electric arc fast transfer from the moving contact, reduces the break-time of circuit breaker, reduces the scaling loss of moving contact, improves current limiting performance.
3, the U-shaped in moving contact zone increases magnetic patch and the moving contact arc striking piece is the structure of integral type, and arc striking piece can upwards attract electric arc, strengthens the effect of grid sheet arc cutting, improves arc voltage; Also processing parts quantity can be reduced, the efficient of production can be improved.
4, the fixed contact U-shaped increases the self-excitation magnetic field that magnetic patch can strengthen the fixed contact zone greatly, accelerates the movement of electric arc, reduces the scaling loss of fixed contact.
5, the arc quenching chamber structure of splicing is simple about, is convenient to processing and arc extinguishing grid pieces is installed.
Description of drawings
Below by by reference to the accompanying drawings with shown in the infinite example to explanation preferred but not exclusive embodiment, can know and understand further characteristic of the present invention and advantage;
Fig. 1 is overall structure figure of the present invention;
Fig. 2 is the explosive view of Fig. 1 structure;
Fig. 3 is arc quenching chamber structure view among Fig. 1;
Fig. 4 is structure chart and the magnetic direction schematic diagram after Fig. 1 removes arc control device 2 and arc extinguishing grid pieces 5;
Fig. 5 is the structural representation after the moving contact 6 among Fig. 4 is scolded out;
Among the figure: 1. the moving contact U-shaped increases magnetic patch; 2. arc control device; 3. the fixed contact U-shaped increases magnetic patch; 4. fixed contact; 5. arc extinguishing grid pieces; 6. moving contact; 11. moving contact arc striking piece; 21,22. grooves; 23. groove.
Embodiment
Referring to Fig. 1 and Fig. 2, arc quenching system of the present invention comprises that arc control device 2, moving contact U-shaped increase magnetic patch 1, the fixed contact U-shaped increases magnetic patch 3, fixed contact 4, moving contact 6 and several arc extinguishing grid pieces 5.In Fig. 3, arc control device 2 are structures of the two shells splicing of left and right symmetry, be provided with some grooves 23 on the inwall of the left and right shell of arc control device 2, be used for installing several arc extinguishing grid pieces 5, arc extinguishing grid pieces 5 is stretched into arc control device 2 inside by the direction of circuit breaker end of incoming cables, be inserted in successively in order groove 23 inside.Fixed contact 4 is fixed on the bottom of arc control device 2, and the fixed contact of fixed contact 4 is positioned at arc control device 2, and moving contact 6 stretches into the arc control device 2 from leading-out terminal.
On the top of the left and right shell of arc control device 2, and near leading-out terminal, have groove 21 vertically downward, in the bottom of the left and right shell of arc control device 2, and near leading-out terminal, have groove 22 vertically upward.It is the U-shaped structure that the moving contact U-shaped increases magnetic patch 1, the opening that the moving contact U-shaped increases magnetic patch 1 towards under, and the moving contact U-shaped increases whole the stretching in two grooves 21 in two side of magnetic patch 1 downwards, it is consistent that the downward degree of depth of two grooves 21 and moving contact U-shaped increase the length of two side of magnetic patch 1, and the moving contact U-shaped is increased between the left and right shell that magnetic patch 1 is connected across arc control device 2.In like manner, it is U-shaped structures that the fixed contact U-shaped increases magnetic patch 3, the opening that the fixed contact U-shaped increases magnetic patch 3 towards directly over, and the fixed contact U-shaped increases whole upwards the stretching in two grooves 22 in two side of magnetic patch 3, it is consistent that the degree of depth that two grooves 22 make progress and fixed contact U-shaped increase the length of two side of magnetic patch 3, and the fixed contact U-shaped is increased between the left and right shell that magnetic patch 3 is connected across arc control device 2.
Referring to Fig. 1-4, the fixed contact of fixed contact 4 increases symmetrical centre position between magnetic patch 3 two sides at the fixed contact U-shaped, and is provided with at fixed contact 4 and can makes the fixed contact U-shaped increase the groove that magnetic patch 3 passes.Moving contact 6 is stretched in the arc control device 2 by the breaker outgoing line end, between fixed contact 4 and arc extinguishing grid pieces 5, when moving contact 6 is upwards scolded out to extreme position, moving contact 6 is wrapped between the two side that the moving contact U-shaped increases magnetic patch 1, moving contact 6 movable end peaks near but be not contacted with the roof that the moving contact U-shaped increases magnetic patch 1.
The moving contact U-shaped increases the roof of magnetic patch 1, be extended with a upwards boss of bending towards the circuit breaker end of incoming cables, upwards the boss of bending namely is moving contact arc striking piece 11, and moving contact arc striking piece 11 can upwards attract electric arc, strengthen the effect of arc extinguishing grid pieces 5 arc cuttings, improve arc voltage.
When the present invention installs, the moving contact U-shaped is increased in magnetic patch 1 is installed to groove 21 on the arc control device 2 downwards from top, then fixed contact 4 is installed in the bottom of arc control device 2 and is in contact with it, the fixed contact of welding stretches into the inside of arc control device 2 on the fixed contact 4.Secondly the fixed contact U-shaped is increased magnetic patch 3 and penetrates groove on the fixed contact 4 from the bottom, stretch in the groove 22 of arc control device 2, be installed to can not promote again till.The moving contact U-shaped increases magnetic patch 1 and fixed contact U-shaped and increases magnetic patch and certain gap is arranged between about in the of 3, and namely groove 21 and groove 22 do not communicate between the two, prevent from playing reverse effect.Some arc extinguishing grid pieces 5 are installed in arc control device 2 inner chambers at last.
Referring to Fig. 4-5, just begun energising at circuit breaker, when moving contact 6 was not opened fully with fixed contact 4, moving contact 6 movable ends and fixed contact were positioned at the symmetrical centre position that the fixed contact U-shaped increases magnetic patch 3 two sides; The moving contact U-shaped increases magnetic patch 1 and produces magnetic field, the direction in magnetic field as shown by the arrows in Figure 4, wherein a part of magnetic field can upwards attract moving contact 6 that it is scolded out fast, reduces the break-time of circuit breaker, improves current limiting performance.After moving contact 6 is scolded out, the moving contact U-shaped increases the two side of magnetic patch 1 and wraps up moving contact 6 fully, moving contact 6 movable end peaks near but do not contact the roof that the moving contact U-shaped increases magnetic patch 1, this moment, the moving contact U-shaped increased the stronger magnetic field of generation on the magnetic patch 1, magnetic direction as shown by the arrows in Figure 5, the transfer of electric arc can be accelerated in this magnetic field.The fixed contact U-shaped increases magnetic patch 3 and produce magnetic field after energising, and its direction is shown in arrow among Fig. 4 and Fig. 5, and this magnetic field can make electric arc shift rapidly, avoids fixed contact seriously to be ablated.
Claims (4)
1. the arc quenching system of a breaker of plastic casing, comprise arc control device (2), fixed contact (4), moving contact (6) and several arc extinguishing grid pieces (5), arc control device (2) are two shell splicing constructions of left and right symmetry, it is characterized in that: the top of the left and right shell of arc control device (2) all has the first groove (21) vertically downward, the opening that the moving contact U-shaped of U-shaped structure increases magnetic patch (1) towards under and the moving contact U-shaped two side that increases magnetic patch (1) stretch downwards in two the first grooves (21); The bottom of the left and right shell of arc control device (2) all has the second groove (22) vertically upward, the opening that the fixed contact U-shaped of U-shaped structure increases magnetic patch (3) towards directly over and the fixed contact U-shaped increase magnetic patch (3) two side and extend upwardly in two grooves (22); The fixed contact of fixed contact (4) is positioned at the fixed contact U-shaped and increases symmetrical centre place between magnetic patch (3) two side, moving contact (6) upwards scold out the extreme position at place be positioned at the moving contact U-shaped increase between magnetic patch (1) two side and moving contact (6) peak near but be not contacted with the roof that the moving contact U-shaped increases magnetic patch (1).
2. arc quenching system according to claim 1 is characterized in that: the roof that the moving contact U-shaped increases magnetic patch (1) is extended with a upwards moving contact arc striking piece (11) of bending towards the circuit breaker end of incoming cables.
3. arc quenching system according to claim 1, it is characterized in that: it is consistent that the downward degree of depth of two the first grooves (21) and moving contact U-shaped increase the length of two side of magnetic patch (1), and it is consistent that the degree of depth that two the second grooves (22) make progress and fixed contact U-shaped increase the length of two side of magnetic patch (3).
4. arc quenching system according to claim 1 is characterized in that: be provided with some grooves (23) for arc extinguishing grid pieces (5) is installed on the inwall of the left and right shell of arc control device 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105251609A CN103021754A (en) | 2012-12-10 | 2012-12-10 | Arc extinguishing system of molded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105251609A CN103021754A (en) | 2012-12-10 | 2012-12-10 | Arc extinguishing system of molded case circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103021754A true CN103021754A (en) | 2013-04-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105251609A Pending CN103021754A (en) | 2012-12-10 | 2012-12-10 | Arc extinguishing system of molded case circuit breaker |
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| Country | Link |
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| CN (1) | CN103021754A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441039A (en) * | 2013-06-28 | 2013-12-11 | 江苏西门控电器有限公司 | Low-voltage plastic shell breaker element box device |
| CN103903919A (en) * | 2014-03-14 | 2014-07-02 | 乐清市捷利电气有限公司 | Miniature circuit breaker |
| CN107633977A (en) * | 2017-09-26 | 2018-01-26 | 厦门宏发开关设备有限公司 | A kind of high voltage DC breaker that can effectively improve arc quenching effect |
| CN112885675A (en) * | 2021-03-24 | 2021-06-01 | 西屋低压开关设备(镇江)有限公司 | Modular single-breakpoint contact arc extinguishing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0917319A (en) * | 1995-06-28 | 1997-01-17 | Matsushita Electric Works Ltd | Arc-extinguishing device |
| JP3216776B2 (en) * | 1994-06-14 | 2001-10-09 | 富士電機株式会社 | Circuit breaker |
| CN101986415A (en) * | 2010-11-11 | 2011-03-16 | 江苏辉能电气有限公司 | Arc extinguishing chamber of molded case low voltage circuit breaker |
| CN102427006A (en) * | 2011-11-08 | 2012-04-25 | 江苏辉能电气有限公司 | Contact structure for low-current molded case low-voltage circuit breaker |
-
2012
- 2012-12-10 CN CN2012105251609A patent/CN103021754A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3216776B2 (en) * | 1994-06-14 | 2001-10-09 | 富士電機株式会社 | Circuit breaker |
| JPH0917319A (en) * | 1995-06-28 | 1997-01-17 | Matsushita Electric Works Ltd | Arc-extinguishing device |
| CN101986415A (en) * | 2010-11-11 | 2011-03-16 | 江苏辉能电气有限公司 | Arc extinguishing chamber of molded case low voltage circuit breaker |
| CN102427006A (en) * | 2011-11-08 | 2012-04-25 | 江苏辉能电气有限公司 | Contact structure for low-current molded case low-voltage circuit breaker |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441039A (en) * | 2013-06-28 | 2013-12-11 | 江苏西门控电器有限公司 | Low-voltage plastic shell breaker element box device |
| CN103903919A (en) * | 2014-03-14 | 2014-07-02 | 乐清市捷利电气有限公司 | Miniature circuit breaker |
| CN107633977A (en) * | 2017-09-26 | 2018-01-26 | 厦门宏发开关设备有限公司 | A kind of high voltage DC breaker that can effectively improve arc quenching effect |
| CN112885675A (en) * | 2021-03-24 | 2021-06-01 | 西屋低压开关设备(镇江)有限公司 | Modular single-breakpoint contact arc extinguishing device |
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Application publication date: 20130403 |