CN202651030U - Small circuit breaker - Google Patents
Small circuit breaker Download PDFInfo
- Publication number
- CN202651030U CN202651030U CN 201220291821 CN201220291821U CN202651030U CN 202651030 U CN202651030 U CN 202651030U CN 201220291821 CN201220291821 CN 201220291821 CN 201220291821 U CN201220291821 U CN 201220291821U CN 202651030 U CN202651030 U CN 202651030U
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- iron core
- magnetic
- circuit breaker
- permanent magnet
- moving iron
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Abstract
The utility model relates to a small circuit breaker which comprises a shell (1), manual operation devices (11, 12 and 13), open and closed contact devices (15 and 16), a trip execution device (14) and a magnetic tripper (17) for driving the trip execution device with high current, wherein the shell is made of insulating materials. The magnetic tripper comprises a magnetic yoke (41), a movable iron core (21), a coil (51), a magnetic return device (61) and a tubular element (31), wherein the coil (51), the movable iron core (21) and the tubular element (31) are of non-circular section structures, the magnetic return device (61) is arranged at the front end or the rear end of the movable iron core, and the movable iron core (21) overcomes suction of the magnetic return device (61) under the action of magnetic force and strikes the trip execution device (14) after moving by a distance, so that the circuit breaker is tripped. The small circuit breaker has the advantages of high operational reliability, simple structure, low cost and the like, the width of the circuit breaker is decreased, the size of the circuit breaker is reduced, and the number of circuit breakers placed in an existing complete switch cabinet is increased.
Description
Technical field
The utility model relates to a kind of miniature circuit breaker, belongs to Low Voltage Electrical Apparatus.
Background technology
At present, the miniature circuit breaker width of extensive use on the market is commonly 18mm, and along with the development of city and rural power grids, the electrical power trans mission/distribution system capacity constantly increases, and level of integrated system improves constantly, and has higher requirement for the performance of circuit breaker.Need simultaneously central controlled feeder number more and more in the electrical network; for the ease of management, realize the maximization of control feeder number in the unit space, namely improve the space availability ratio of protection electrical equipment; only dwindle protection electrical equipment volume, lay quantity with the circuit breaker that increases in the existing voltage switchgear.In addition, the miniaturization of circuit breaker can also economical with materials, reduces manufacturing cost.This problem is more outstanding for the miniature circuit breaker that has a large capacity and a wide range, 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: be comprised of the moving iron core 1 of circle, circular static iron core 5, circular coil 4, circular casing 2, back-moving spring 3, yoke 6.
Circular moving iron core is being fixed by plastic casing or the setting element that is fixed on the plastic casing away from the direction of 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, between the sound iron core, is in compressive state, and power value f1 makes circular moving iron core and the circular static iron core that is fixed on the yoke keep certain distance.
The electric current of magnetic tripping system in coil is during 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, be failure to actuate to guarantee moving iron core, maintain a certain distance with release lever, do not have dynamics to put on release lever, circuit breaker is not threaded off;
The electric current of magnetic tripping system in coil is during 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 the 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---the iron core external diameter is to the distance (cm) between the 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 circular configuration iron core, circular configuration coil reduces about 1/16.
The electric current of magnetic tripping system in coil is during greater than predetermined value, the magnetic force that produces is very little, if overcome the resistance f1 of back-moving spring 3, spring design can be become 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 can't 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 protection electrical equipment volume, improves the space availability ratio of protection electrical equipment, increases the trend that circuit breaker in the existing voltage switchgear is laid quantity.
The utility model content
Based on above-mentioned, in order to overcome the problem in the prior art scheme, the utility model 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 taked of the utility model 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 that nonmagnetic substance is made, its cross section are that hollow is non-circular, are used 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 the noncircular cross section around the aforementioned tube linear element of being made by insulated conductor; Yoke is made by permeability magnetic material, is arranged on around the above-mentioned coil; The magnetic return mechanism is arranged on front end or the rear end of moving the iron core direction of motion, is used for keeping when inactive state moving iron core apart from the tripping actuating device certain distance; When the electric current in the coil during greater than predetermined value, magnetic release is by the current excitation in the coil, and moving iron core overcomes the suction of magnetic return mechanism, moves to the tripping actuating device direction.
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.
Be provided with static iron core on the described yoke, this static iron core is non-circular perpendicular to the cross section of axis.
Described magnetic release has a fixed cap that is used for fixed permanent magnet, fixed cap is a chamber, cave with proper wall thickness of separating with shell, has 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 a fixed cap that is used for fixed permanent magnet, and fixed cap is a permanent magnet supporting surface with the 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 utility model 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 the existing voltage switchgear and laid quantity, have that operating reliability is high, simple in structure, low cost and other advantages.
Description of drawings
Fig. 1 is the structural representation of the utility model miniature circuit breaker 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 the utility model miniature circuit breaker forms schematic diagram;
Fig. 4 is the magnetic releasing structure cover plate schematic diagram of the utility model miniature circuit breaker;
Fig. 5 is the magnetic releasing structure fixed cap schematic diagram of the utility model miniature circuit breaker;
Fig. 6 is the magnetic releasing structure excited state upper/lower positions schematic diagram not of the utility model miniature circuit breaker;
Fig. 7 is the magnetic releasing structure excited state upper/lower positions schematic diagram of the utility model miniature circuit breaker.
Embodiment
The utility model 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 that nonmagnetic substance is made, its cross section are that hollow is non-circular, are used 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 the noncircular cross section around the aforementioned tube linear element of being made by insulated conductor; Yoke is made by permeability magnetic material, is arranged on around the above-mentioned coil; The magnetic return mechanism is arranged on front end or the rear end of moving the iron core direction of motion, is used for keeping when inactive state moving iron core apart from the tripping actuating device certain distance; When the electric current in the coil during greater than predetermined value, magnetic release is by the current excitation in the coil, and moving iron core overcomes the suction of magnetic return mechanism, moves to the tripping actuating device direction.
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.
Be provided with static iron core on the described yoke, this static iron core is non-circular perpendicular to the cross section of axis.
Described magnetic release has a fixed cap that is used for fixed permanent magnet, fixed cap is a chamber, cave with proper wall thickness of separating with shell, has 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 a fixed cap that is used for fixed permanent magnet, and fixed cap is a permanent magnet supporting surface with the 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.
The utility model is described in further detail below in conjunction with accompanying drawing.
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, is used for driving tripping actuating device 14, and the cross section of moving iron core 21 is the fillet rectangle;
Yoke 41 is made rectangle by permeability magnetic material and is arranged on around the above-mentioned coil 51;
When the electric current in the coil 51 during greater than predetermined value, magnetic release is by the current excitation in the 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 the fillet rectangle structure, compare the moving core area of the circular configuration under the 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
2In the miniature circuit breaker of the utility model 9mm, 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 the circular iron core structure, its area is 9mm
2If, the fillet rectangle, width is 3.4mm, and length can reach 7.4mm, and area has then reached 25mm
2For the little Type B circuit breaker of rated current, magnetic conductive area increases particularly important to the raising of magnetic force.
As shown in Figure 6: the 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 to the magnetic force f1 of moving iron core greater than magnetic force F, 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, when being greater than or equal to operating current, the magnetic force that moving iron core 21 is subject to is F to the magnetic tripping system at coil, and less than magnetic force F, moving iron core 21 overcomes permanent magnet and attracts setting in motion permanent magnet to the magnetic force f1 of moving iron core 21.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 is subject to of moving iron core 21 becomes rapidly large along with the distance with yoke (or static iron core) diminishes as can be known, moving iron core 21 is along with the magnetic force f1 that the increase with the permanent magnet distance is subject to reduces rapidly, and conventional reset spring decrement in the motion process of moving iron core 21 is increasing, and resistance is also increasing.Therefore, the impulsive force of the moving iron core 21 strike release levers in the utility model and speed make the circuit breaker tripping safety and reliability all greater than the back-moving spring in the traditional structure.
Shown in Fig. 3,6,7, the tube element 31 in the fillet rectangle cross section in the 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.
Shown in Fig. 3,4, the boss 46 of yoke 41, boss 47 cooperate the magnetic loop that forms the magnetic tripping system with groove 44, the groove 45 of corresponding cover plate 43, 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, and the inner face 75 of fixed cap 71 is fitted with the face of yoke 48.As shown in Figure 1, fixed cap 71, cover plate 43, yoke 41 are placed in chamber, cave corresponding to ambroin shell, and then can prevent permanent magnet translation on the direction beyond the tube element 31.
Embodiment 2
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 passed through large electric current, moving iron core to the direction motion of tripping actuating device 14, hit tripping actuating device 14 under the effect of the magnetic force in the magnetic field that helical coil produces, make circuit breaker tripping.Compare case study on implementation 1, when coil 51 passed through same current, the magnetic force to moving iron core of this structure generation was little, on the large product of rated current, had advantages of the static iron core of saving cost.
Miniature circuit breaker width of the present utility model is 9mm, adapt to improve the space availability ratio of protection electrical equipment, dwindles protection electrical equipment volume, lays the trend of quantity to increase circuit breaker in the 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 consist of any type of restriction to the desired protection range of the utility model, and claims of the present utility model have covered all modifications and changes.
Claims (5)
1. 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) is used for driving above-mentioned tripping actuating device (14), and moving iron core (21) is non-circular perpendicular to the cross section of axis;
The tube element that nonmagnetic substance is made (31), its cross section are that hollow is non-circular, are used 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 aforementioned tube linear element (31) noncircular cross section on every side of being made by insulated conductor;
Yoke (41) is made by permeability magnetic material, is arranged on above-mentioned coil (51) on every side;
Magnetic return mechanism (61) is arranged on front end or the rear end of moving iron core (21) direction of motion, is used for keeping when inactive state moving iron core (21) apart from tripping actuating device (17) certain distance;
When the electric current in the coil (51) during greater than predetermined value, magnetic release is by the current excitation in the coil (51), and moving iron core (21) overcomes the suction of magnetic return mechanism (61), moves to tripping actuating device (14) direction.
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:
Be provided with static iron core (25) on the described yoke, 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 (71) that is used for fixed permanent magnet, fixed cap (71) is a chamber, cave with proper wall thickness of separating with shell (1), has 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 (71) that is used for fixed permanent magnet, 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 |
|---|---|---|---|
| CN 201220291821 CN202651030U (en) | 2012-06-18 | 2012-06-18 | Small circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220291821 CN202651030U (en) | 2012-06-18 | 2012-06-18 | Small circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202651030U true CN202651030U (en) | 2013-01-02 |
Family
ID=47420095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220291821 Expired - Lifetime CN202651030U (en) | 2012-06-18 | 2012-06-18 | Small circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202651030U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103515162A (en) * | 2012-06-18 | 2014-01-15 | 北京人民电器厂有限公司 | Miniature circuit breaker |
-
2012
- 2012-06-18 CN CN 201220291821 patent/CN202651030U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103515162A (en) * | 2012-06-18 | 2014-01-15 | 北京人民电器厂有限公司 | Miniature circuit breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130102 |