CN103515162A - Miniature circuit breaker - Google Patents
Miniature circuit breaker Download PDFInfo
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- CN103515162A CN103515162A CN201210205023.7A CN201210205023A CN103515162A CN 103515162 A CN103515162 A CN 103515162A CN 201210205023 A CN201210205023 A CN 201210205023A CN 103515162 A CN103515162 A CN 103515162A
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- iron core
- magnetic
- circuit breaker
- permanent magnet
- moving iron
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Abstract
The invention relates to a miniature circuit breaker. The miniature circuit breaker comprises a shell (1) made of an insulating material, manual operation devices (11, 12 and 13), disconnecting and closing contact devices (15 and 16), a tripping execution device (14) and a magnetic tripping device (17) of a high-current-driven tripping execution device. The magnetic tripping device comprises a magnetic yoke (41), a movable core (21), a coil (51), a magnetic return device (61) and a tubular element (31), wherein the coil (51), the movable core (21) and the tubular element (31) are of non-circular cross section structures, the magnetic return device (61) is arranged at the front end or the back end of the movable core. Under the effect of a magnetic force, the movable core (21) overcomes the attraction force of the magnetic return device (61), and beats the tripping execution device (14) after moving a segment of distance, such that the circuit breaker can trip. According to the miniature circuit breaker, the width and the size of the circuit breaker are decreased, and therefore, with the miniature circuit breaker adopted, more circuit breakers can be mounted in an existing complete set of switch cabinet. The miniature circuit breaker is advantageous in high reliability in operation, structural simplicity and low cost.
Description
Technical field
The present invention relates to a kind of miniature circuit breaker, belong to Low Voltage Electrical Apparatus.
Background technology
At present, the miniature circuit breaker width of extensive use on market is commonly 18mm, and along with the development of city and rural power grids, electrical power trans mission/distribution system capacity constantly increases, and level of integrated system improves constantly, and for the performance of circuit breaker, has higher requirement.In electrical network, need central controlled feeder number more and more simultaneously; for the ease of management, realize the maximization of controlling feeder number in unit space, improve the space availability ratio of protective device; only dwindle protective device volume, with the circuit breaker increasing in existing voltage switchgear, lay quantity.In addition, the miniaturization of circuit breaker can also be saved material, reduces manufacturing cost.For the miniature circuit breaker having a large capacity and a wide range, this problem is more outstanding, and therefore, high-performance, miniaturization circuit breaker have become a kind of inexorable trend of electrical equipment development.
The magnetic releasing structure of traditional circuit breaker that is applied in 18mm is as shown in Figure 2: the moving iron core 1 of circle, circular static iron core 5, circular coil 4, circular casing 2, back-moving spring 3, yoke 6, consist of.
Circular moving iron core is fixed by plastic casing or the setting element that is fixed on plastic casing in the direction away from circular static iron core, can not be to the direction motion away from static iron core; Back-moving spring 3 is positioned at circular casing, and between sound iron core, in compressive state, power value f1, makes circular moving iron core and the circular static iron core being fixed in yoke keep certain distance.
When the electric current of magnetic tripping system in coil is less than predetermined value, circular moving iron core is subject to the magnetic force F to circular static iron core direction, the resistance f1 of back-moving spring 3 should be greater than magnetic force F, to guarantee moving iron core, be failure to actuate, maintain a certain distance with release lever, do not have dynamics to put on release lever, circuit breaker is not threaded off;
When the electric current of magnetic tripping system in coil is greater than predetermined value, circular moving iron core is subject to the magnetic force F to circular static iron core direction, and the resistance f1 of back-moving spring 3 should be less than magnetic force F, and circular moving iron core moves to circular static iron core direction, velocity shock release lever with certain, makes circuit breaker tripping.
The magnetic attraction calculation formula of magnetic releasing structure
The current effective value that I---coil passes through (A);
The number of turn of W---coil;
Air gap between δ---iron core and armature (cm).
Cross-sectional area (the cm of s---dynamic and static iron core
2);
Z---moving iron core inserts the length (cm) of magnetic plug part;
The interior cavity length (cm) of lc---screwed pipe yoke;
μ
0---the magnetic capacity μ of air
0=0.4 π * 10
-8(H/cm);
The air-gap permeance of g---solenidal electromagnet,
G=2 π μ
0/ ln[(2C+2r)/2r] (H), in this formula: C---iron core external diameter is to the distance (cm) between screwed pipe inwall; R---the radius (cm) of moving (quiet) iron core.
After the width of miniature circuit breaker makes 9mm into by 18mm, can around the number of turn W of coil reduce approximately half, the cross-sectional area s of dynamic and static iron core reduces to be about 1/4, the magnetic force F of this kind of circular configuration iron core, circular configuration coil reduces 1/16 left and right.
When the electric current of magnetic tripping system in coil is greater than predetermined value, the magnetic force producing is very little, if overcome the resistance f1 of back-moving spring 3, spring design can be become to very little, if but the little ampere of Type B product, spring will be so small as to and exceeds scope of design, and extremely unstable, so circuit breaker cannot be realized the function of scheduled current action.
Therefore the structure of magnetic tripping system circular cross-section is difficult to adapt to and dwindles now protective device volume, improves the space availability ratio of protective device, increases the trend that circuit breaker in existing voltage switchgear is laid quantity.
Summary of the invention
Based on above-mentioned, in order to overcome the problem in prior art scheme, the present invention aims to provide the miniature circuit breaker of extra-thin 9mm, and this circuit breaker has that operating reliability is high, simple in structure, low cost and other advantages.
For this reason, the technical scheme that the present invention takes is:
A kind of miniature circuit breaker, comprise shell, hand-operating device that insulating material is made, the magnetic release of disconnection and closed contact device, tripping actuating device, large driven current density tripping actuating device, it is characterized in that magnetic release comprises: moving iron core, be used for driving above-mentioned tripping actuating device, moving iron core is non-circular perpendicular to the cross section of axis; The tube element ，Qi cross section that nonmagnetic substance is made is that hollow is non-circular, for assembling above-mentioned moving iron core, and moving iron core is led in the motion of axis direction; The coil that is wrapped in above-mentioned tube element noncircular cross section around of being made by insulated conductor; Yoke, is made by permeability magnetic material, is arranged on around above-mentioned coil; Magnetic return mechanism, is arranged on front end or the rear end of the moving iron core direction of motion, for keeping moving iron core apart from tripping actuating device certain distance when the inactive state; When the electric current in coil is greater than predetermined value, magnetic release is by the current excitation in coil, and moving iron core overcomes the suction of magnetic return mechanism, to tripping actuating device direction, moves.
Further:
Described magnetic return mechanism is the permanent magnet made from permanent magnetic material, and the magnetic flux distribution center line of permanent magnet is consistent with the central axis of moving iron core.
In described yoke, be provided with static iron core, this static iron core is non-circular perpendicular to the cross section of axis.
Described magnetic release has one for the fixed cap of fixed permanent magnet, fixed cap is a cave chamber with proper wall thickness separated with shell, there is definite position relationship with shell, fixed cap inside is useful on the groove that holds above-mentioned permanent magnet, and the degree of depth of this groove is not more than the length of permanent magnet on axis direction.
Described magnetic release has one for the fixed cap of fixed permanent magnet, and fixed cap is a permanent magnet supporting surface with shell one, and fixed cap inside is useful on the groove that holds above-mentioned permanent magnet, and the degree of depth of this groove is not more than the length of permanent magnet on axis direction.
Compared with prior art, the magnetic releasing structure width of miniature circuit breaker of the present invention is 7mm, the width of circuit breaker is 9mm, reduced circuit breaker width, dwindled the circuit breaker that the body that opens circuit amassed, increased in existing voltage switchgear and laid quantity, have that operating reliability is high, simple in structure, low cost and other advantages.
Accompanying drawing explanation
Fig. 1 is the structural representation of miniature circuit breaker of the present invention inside;
Fig. 2 is that the magnetic releasing structure of traditional miniature circuit breaker forms schematic diagram;
Fig. 3 is that the magnetic releasing structure of miniature circuit breaker of the present invention forms schematic diagram;
Fig. 4 is the magnetic releasing structure cover plate schematic diagram of miniature circuit breaker of the present invention;
Fig. 5 is the magnetic releasing structure fixed cap schematic diagram of miniature circuit breaker of the present invention;
Fig. 6 is the magnetic releasing structure excited state upper/lower positions schematic diagram not of miniature circuit breaker of the present invention;
Fig. 7 is the magnetic releasing structure excited state upper/lower positions schematic diagram of miniature circuit breaker of the present invention.
Embodiment
The present invention relates to a kind of miniature circuit breaker, comprise shell, hand-operating device that insulating material is made, the magnetic release of disconnection and closed contact device, tripping actuating device, large driven current density tripping actuating device, it is characterized in that magnetic release comprises: moving iron core, be used for driving above-mentioned tripping actuating device, moving iron core is non-circular perpendicular to the cross section of axis; The tube element ，Qi cross section that nonmagnetic substance is made is that hollow is non-circular, for assembling above-mentioned moving iron core, and moving iron core is led in the motion of axis direction; The coil that is wrapped in above-mentioned tube element noncircular cross section around of being made by insulated conductor; Yoke, is made by permeability magnetic material, is arranged on around above-mentioned coil; Magnetic return mechanism, is arranged on front end or the rear end of the moving iron core direction of motion, for keeping moving iron core apart from tripping actuating device certain distance when the inactive state; When the electric current in coil is greater than predetermined value, magnetic release is by the current excitation in coil, and moving iron core overcomes the suction of magnetic return mechanism, to tripping actuating device direction, moves.
Further:
Described magnetic return mechanism is the permanent magnet made from permanent magnetic material, and the magnetic flux distribution center line of permanent magnet is consistent with the central axis of moving iron core.
In described yoke, be provided with static iron core, this static iron core is non-circular perpendicular to the cross section of axis.
Described magnetic release has one for the fixed cap of fixed permanent magnet, fixed cap is a cave chamber with proper wall thickness separated with shell, there is definite position relationship with shell, fixed cap inside is useful on the groove that holds above-mentioned permanent magnet, and the degree of depth of this groove is not more than the length of permanent magnet on axis direction.
Described magnetic release has one for the fixed cap of fixed permanent magnet, and fixed cap is a permanent magnet supporting surface with shell one, and fixed cap inside is useful on the groove that holds above-mentioned permanent magnet, and the degree of depth of this groove is not more than the length of permanent magnet on axis direction.
Below in conjunction with accompanying drawing, the invention will be further described.
A kind of miniature circuit breaker, its width is 9mm, as shown in Figure 1, it comprises the magnetic release 17 of shell 1, hand-operating device 11-13, disconnection and closed contact device 15 and 16 that insulating material makes, tripping actuating device 14, large driven current density tripping actuating device.As shown in Figure 3, magnetic release comprises: fixed cap 71, moving iron core 21, push rod 23, tube element 31, yoke 41, magnetic return mechanism 61, coil 51, static iron core 25.Wherein:
Moving iron core 21 is fixing with push rod 23, and for driving tripping actuating device 14, the cross section of moving iron core 21 is fillet rectangle;
It is hollow fillet rectangle that tube element 31 is made ，Qi cross section by nonmagnetic substance, for assembling moving iron core 21, and moving iron core 21 is led in the motion of axis direction;
Coil 51 is made by insulated conductor, be wrapped in above-mentioned tube element 31 around ，Qi cross section be fillet rectangle;
Yoke 41 is made rectangle by permeability magnetic material and is arranged on around above-mentioned coil 51;
Magnetic return mechanism 61, is arranged on front end or the rear end of moving iron core 21 directions of motion, for keeping moving iron core apart from tripping actuating device 14 certain distances when the inactive state.
When the electric current in coil 51 is greater than predetermined value, magnetic release is by the current excitation in coil 51, and moving iron core 21 is to the direction motion of tripping actuating device 14.
In this preferred embodiment, coil 51, moving iron core 21 are designed to fillet rectangle structure, compare the moving core area of the circular configuration under equal width conditions, and fillet rectangle structure area obviously increases.The iron core diameter of the miniature circuit breaker of former 18mm is 5.8mm, and area is 26mm
2.In the miniature circuit breaker of 9mm of the present invention, the width of magnetic releasing structure is up to 7mm, deducts coil and sleeve pipe takes up space, and the Breadth Maximum of iron core is 3.4mm, if circular iron core structure, its area is 9mm
2if, fillet rectangle, width is 3.4mm, and length can reach 7.4mm, and area has reached 25mm
2.For the little Type B circuit breaker of rated current, magnetic conductive area increases particularly important to the raising of magnetic force.
Magnetic return mechanism 61 is permanent magnets made from permanent magnetic material, and the magnetic flux distribution center line of permanent magnet is consistent with the central axis of moving iron core.Permanent magnet has the wide feature of magnetic attraction scope of design of stable performance, generation, has solved spring force value and has been subject to the problem that volume restrictions is larger, more reliable than spring.Permanent magnet replacement back-moving spring is the fixation to moving iron core as magnetic tripping system.
Static iron core 25 is fixed in yoke 41, with the central axis of permanent magnet, moving iron core 21 on same axis.Static iron core 25 is fillet rectangle perpendicular to the cross section of axis.
As shown in Figure 6: magnetic tripping system at coil when being less than or equal to scheduled current, the magnetic force that moving iron core 3 is subject to is F, permanent magnet is greater than magnetic force F to the magnetic force f1 of moving iron core, moving iron core 21 is attracted, contacts by permanent magnet, guaranteed that moving iron core is failure to actuate, maintain a certain distance with tripping actuating device 14, do not have dynamics to put on tripping actuating device 14, circuit breaker is not threaded off.
As shown in Figure 7, magnetic tripping system is at coil when being greater than or equal to operating current, and the magnetic force that moving iron core 21 is subject to is F, and permanent magnet is less than magnetic force F to the magnetic force f1 of moving iron core 21, and moving iron core 21 overcomes permanent magnet and attracts setting in motion.The tripping actuating device 14 that moving iron core 21 promotes operating system drives dynamic and static contact separating brake, realizes the disconnection of circuit.
In the motion process of moving iron core 21, according to:
The electromagnetic force F that known moving iron core 21 is subject to becomes rapidly large along with the distance with yoke (or static iron core) diminishes, moving iron core 21 is along with the magnetic force f1 that the increase with permanent magnet distance is subject to reduces rapidly, and conventional reset spring decrement in the motion process of moving iron core 21 is increasing, resistance is also increasing.Therefore, impulsive force and speed that the moving iron core 21 in the present invention hits release lever are all greater than the back-moving spring in traditional structure, make circuit breaker tripping safety and reliability.
As shown in Fig. 3,6,7, the tube element 31 in the fillet rectangle cross section in magnetic tripping system, between moving iron core 21 and coil 51, its cross section is narrower than the cross section of permanent magnet at least one direction, can prevent that permanent magnet is to tube element 31 direction translations with yoke and the acting in conjunction of ambroin shell.
As shown in Figure 3,4, the boss 46 of yoke 41, boss 47 coordinate with groove 44, the groove 45 of corresponding cover plate 43 magnetic loop that forms magnetic tripping system, form yoke 41.
As shown in Figure 5, the inner of fixed cap 71 has groove 72, and its shape is identical with the outer surface of permanent magnet, and the degree of depth is not more than the length of permanent magnet on axis direction.Boss 74 groove 44 corresponding with cover plate that accommodates the fixed cap 71 of permanent magnet pegged graft, the inner face 75 of fixed cap 71 and 48 laminatings of the face of yoke.As shown in Figure 1, fixed cap 71, cover plate 43, yoke 41 are placed in the chamber, cave that ambroin shell is corresponding, and then can prevent that permanent magnet is to the translation in direction beyond tube element 31.
Case study on implementation 2 is with the difference of case study on implementation 1, does not comprise static iron core 25 and push rod 23 in the structure of magnetic release.When coil 51 logical super-high-current, under the effect of the magnetic force in the magnetic field that moving iron core produces at helical coil, to the direction motion of tripping actuating device 14, hit tripping actuating device 14, make circuit breaker tripping.Compare case study on implementation 1, when coil 51 passes through same current, the magnetic force to moving iron core of this structure generation is little, on the large product of rated current, has advantages of the static iron core of saving cost.
Miniature circuit breaker width of the present invention is 9mm, adapt to improve the space availability ratio of protective device, dwindles protective device volume, lays the trend of quantity to increase circuit breaker in existing voltage switchgear.And the magnetic releasing structure of this miniature circuit breaker adopts the mode of the moving iron core of permanent magnet and fillet rectangle cross section, has guaranteed the requirements such as the operating reliability of circuit breaker is high, simple in structure, cost is low.
Above-mentioned case study on implementation does not form any type of restriction to protection range of the presently claimed invention, and claims of the present invention have covered all modifications and changes.
Claims (5)
1. a miniature circuit breaker, comprise shell (1), hand-operating device (11,12,13) that insulating material is made, the magnetic release (17) of disconnection and closed contact device (15,16), tripping actuating device (14), large driven current density tripping actuating device, is characterized in that magnetic release comprises:
Moving iron core (21), for driving above-mentioned tripping actuating device (14), moving iron core (21) is non-circular perpendicular to the cross section of axis;
The tube element that nonmagnetic substance is made (31) ，Qi cross section is that hollow is non-circular, for assembling above-mentioned moving iron core (21), and moving iron core (21) is led in the motion of axis direction;
The coil (51) that is wrapped in above-mentioned tube element (31) noncircular cross section around of being made by insulated conductor;
Yoke (41), is made by permeability magnetic material, is arranged on above-mentioned coil (51) around;
Magnetic return mechanism (61), is arranged on front end or the rear end of moving iron core (21) direction of motion, for keeping moving iron core (21) apart from tripping actuating device (17) certain distance when the inactive state;
When the electric current in coil (51) is greater than predetermined value, magnetic release is by the current excitation in coil (51), and moving iron core (21) overcomes the suction of magnetic return mechanism (61), to tripping actuating device (14) direction, moves.
2. miniature circuit breaker as claimed in claim 1, is characterized in that:
Described magnetic return mechanism (61) is the permanent magnet made from permanent magnetic material, and the magnetic flux distribution center line of permanent magnet is consistent with the central axis of moving iron core.
3. miniature circuit breaker as claimed in claim 1, is characterized in that:
In described yoke, be provided with static iron core (25), this static iron core is non-circular perpendicular to the cross section of axis.
4. miniature circuit breaker as claimed in claim 1, is characterized in that:
Described magnetic release has a fixed cap for fixed permanent magnet (71), fixed cap (71) is that stop up in a cave with proper wall thickness separated with shell (1), there is definite position relationship with shell (1), fixed cap (71) inside is useful on the groove that holds above-mentioned permanent magnet, and the degree of depth of this groove is not more than the length of permanent magnet on axis direction.
5. miniature circuit breaker as claimed in claim 1, is characterized in that:
Described magnetic release has a fixed cap for fixed permanent magnet (71), fixed cap (71) is a permanent magnet supporting surface with shell (1) one, fixed cap inside is useful on the groove that holds above-mentioned permanent magnet, and the degree of depth of this groove is not more than the length of permanent magnet on axis direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210205023.7A CN103515162A (en) | 2012-06-18 | 2012-06-18 | Miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210205023.7A CN103515162A (en) | 2012-06-18 | 2012-06-18 | Miniature circuit breaker |
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| Publication Number | Publication Date |
|---|---|
| CN103515162A true CN103515162A (en) | 2014-01-15 |
Family
ID=49897707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210205023.7A Pending CN103515162A (en) | 2012-06-18 | 2012-06-18 | Miniature circuit breaker |
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| CN (1) | CN103515162A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109216122A (en) * | 2017-06-30 | 2019-01-15 | 浙江和泰电器有限公司 | Core component on permanent-magnet breaker |
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| US4626813A (en) * | 1984-04-04 | 1986-12-02 | Omron Tateisi Electronics Co. | Electromagnetic drive and polarized relay |
| CN1107606A (en) * | 1994-02-28 | 1995-08-30 | 断路器工业有限公司 | An electro-magnetic device |
| CN101461022A (en) * | 2006-06-12 | 2009-06-17 | 埃伦贝格尔及珀恩斯根有限公司 | Protection switch |
| CN102017042A (en) * | 2008-04-24 | 2011-04-13 | 松下电工株式会社 | Electromagnet for relay |
| CN102176393A (en) * | 2011-01-18 | 2011-09-07 | 西安交通大学 | Adaptive alternating current/direct current universal electromagnetic mechanism with permanent magnet |
| CN102339694A (en) * | 2010-07-15 | 2012-02-01 | 北京翠祥电器元件有限公司 | Small-sized molded case circuit breaker (MCCB) |
| CN202651030U (en) * | 2012-06-18 | 2013-01-02 | 北京人民电器厂有限公司 | Small circuit breaker |
-
2012
- 2012-06-18 CN CN201210205023.7A patent/CN103515162A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4626813A (en) * | 1984-04-04 | 1986-12-02 | Omron Tateisi Electronics Co. | Electromagnetic drive and polarized relay |
| CN1107606A (en) * | 1994-02-28 | 1995-08-30 | 断路器工业有限公司 | An electro-magnetic device |
| CN101461022A (en) * | 2006-06-12 | 2009-06-17 | 埃伦贝格尔及珀恩斯根有限公司 | Protection switch |
| CN102017042A (en) * | 2008-04-24 | 2011-04-13 | 松下电工株式会社 | Electromagnet for relay |
| CN102339694A (en) * | 2010-07-15 | 2012-02-01 | 北京翠祥电器元件有限公司 | Small-sized molded case circuit breaker (MCCB) |
| CN102176393A (en) * | 2011-01-18 | 2011-09-07 | 西安交通大学 | Adaptive alternating current/direct current universal electromagnetic mechanism with permanent magnet |
| CN202651030U (en) * | 2012-06-18 | 2013-01-02 | 北京人民电器厂有限公司 | Small circuit breaker |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109216122A (en) * | 2017-06-30 | 2019-01-15 | 浙江和泰电器有限公司 | Core component on permanent-magnet breaker |
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Application publication date: 20140115 |