CN201773802U - Miniature plastic casing type circuit breaker - Google Patents
Miniature plastic casing type circuit breaker Download PDFInfo
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- CN201773802U CN201773802U CN201020265886XU CN201020265886U CN201773802U CN 201773802 U CN201773802 U CN 201773802U CN 201020265886X U CN201020265886X U CN 201020265886XU CN 201020265886 U CN201020265886 U CN 201020265886U CN 201773802 U CN201773802 U CN 201773802U
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- tripping system
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- circuit breaker
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Abstract
The utility model relates to a miniature plastic casing type circuit breaker, which comprises an insulating plastic casing, an incoming and outgoing wire terminal, a thermal tripping system, a magnetic tripping system, movable and static contacts, an operating mechanism and an arc extinguishing system, wherein the incoming and outgoing wire terminal, the thermal tripping system, the magnetic tripping system, the movable and static contacts, the operating mechanism and the arc extinguishing system are placed in the insulating plastic casing; the operating mechanism drives the movable contact to realize the closing and switching off of the circuit; the magnetic tripping system comprises a magnetic clutch, an iron core, a sleeve and a coil; one end of the coil is connected with the static contact through the magnetic clutch or is directly connected with the static contact; the other end of the coil is connected with the thermal tripping system or is connected with a wiring terminal; and the coil of the magnetic tripping system adopts a non-circular structure. Moreover, the iron core of the magnetic tripping system is made of non-cylindrical magnetic conducting material; and the sleeve of the magnetic tripping system adopts a non-circular structure. The magnetic tripping system and the thermal tripping system are optimally designed; therefore, the utility model provides an ultrathin miniature circuit breaker with the width of 9 mm. Relative to the traditional products with the width of 18 mm, the circuit breaker is reduced by fifty percent in width, and has the advantages of high operating reliability, simple structure, low cost and the like.
Description
Technical field
The utility model relates to a kind of small plastic shell type circuit breaker, belongs to the low-voltage electrical apparatus field.
Background technology
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, for the demands for higher performance of circuit breaker.Need central controlled feeder number more and more simultaneously in the electrical network; for the ease of management, realize the maximization of unit space inner control feeder number, promptly 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.Simultaneously, the miniaturization of circuit breaker can also economical with materials, reduces manufacturing cost, and this problem is more outstanding for the miniature circuit breaker that has a large capacity and a wide range.Therefore, high-performance, miniaturization circuit breaker have become a kind of inexorable trend of electrical equipment development.At present, the miniature circuit breaker width of extensive use on the market is commonly 18mm (2 base modules), but also some product is that cost reduces the circuit breaker width to sacrifice the various technical performance indexs of circuit breaker.
The utility model content
According to the problems referred to above, the utility model aims to provide a kind of simple in structure, reliability is high, cost is low ultrathin small plastic shell type circuit breaker.It can reduce the circuit breaker width protecting under the constant condition of original technical performance, improves the space availability ratio of switch.
The technical solution adopted in the utility model is as follows:
A kind of small plastic shell type circuit breaker, the turnover line terminals that comprises the ambroin shell and be placed in one, hot tripping system, magnetic tripping system, dynamic/static contact, operating mechanism and arc quenching system, operating mechanism drives moving contact and realizes closing of circuit and disconnection; The magnetic release system by magnetic grip, iron core, sleeve pipe and coil form, its coil one end is gripped with fixed contact through magnetic and is connected, or directly is connected with fixed contact; The other end and heat are taken off that device is connected or are connected with binding post, it is characterized in that:
The coil of described magnetic tripping system is by the thread non-ring shape structure that is at least a circle of copper enamel-cover.
The iron core of described magnetic tripping system is made by the permeability magnetic material of a non-cylindrical.
The sleeve pipe of described magnetic tripping system is a non-ring shape structure.
Coil in the described magnetic tripping system, iron core, sleeve pipe all adopt square structure.
The utility model is for the parts in the miniature circuit breaker ambroin shell, especially the magnetic tripping system has carried out optimal design, coil in the magnetic tripping system, sleeve pipe, moving iron core, static iron core all adopt square structure, with respect to traditional circular configuration, have under the prerequisite of identical current carrying density, promptly have under the condition of same cross-sectional area, square structure on width less than the coil of circular configuration, sleeve pipe, moving iron core, static iron core.Therefore, the magnetic tripping system can satisfy the insulation shell inside that places the 9mm width under the condition of temperature rise, has reduced 50% with respect to this circuit breaker width of product of traditional 18mm width, has operating reliability height, simple in structure, low cost and other advantages.
Description of drawings
Fig. 1 is a small plastic shell type circuit breaker outline drawing;
Fig. 2 is a small plastic shell type circuit breaker cut-away view
Fig. 3 is a small plastic shell type circuit breaker magnetic tripping system sketch.
Embodiment
The utility model provides a kind of simple in structure, the ultrathin small plastic shell type of reliability is high, cost is low 9mm width circuit breaker.Theoretically, miniaturization means that promptly case for circuit breaker volume and inside thereof can utilize the space obviously to reduce, therefore, circuit breaker will realize that the miniaturization inevitable requirement forms each parts of circuit breaker and all will realize miniaturization, comprise arc quenching system, contact system, operating mechanism, magnetic tripping system, hot tripping system etc.But, miniaturization is not simply to dwindle the parts volume just can meet the demands, under the increasing situation of power load, the prerequisite of miniaturization is the through-current capability that can not sacrifice electrical equipment, the unit volume of saying so accurately through-current capacity (comprising current capacity and short circuit breaking capacity), even also will increase.
The subject matter of considering during the utility model design is as follows:
1. the flexibility of mechanism action and reliability.Because reducing of overall space, operating mechanism also will be optimized design according to the size of Shell of circuit breaker inner space, promptly under the requirement of satisfying space structure, need guarantee the operating mechanism action message when short circuit, overload fault and manual branch, combined floodgate;
2. temperature rise.Shell of circuit breaker is the space of a sealing, easily causes the air flow property deficiency, and radiating condition is poor.After adopting miniaturization Design, the reducing of shell volume makes the parts area of dissipation also reduce, component density increase simultaneously causes the caloric value of unit volume to increase, these unfavorable factors maximum difficult point that makes miniaturization Design bring that gathers together is exactly temperature rise, needs emphasis to consider in the miniaturization Design process so how to reduce temperature rise.
Require according to temperature rise test among the GB10963.1 and measurement of power loss: under any suitable voltage, each utmost point of circuit breaker is passed to the electric current that equals In (rated current of circuit breaker) simultaneously, the binding post temperature rise that connects external conductor should not surpass 60K, and every utmost point power consumption should not surpass 13W during rated current 63A.The circuit breaker internal volume diminishes, and what temperature rise was had the greatest impact is the magnetic tripping system, and in general, in order to satisfy the temperature rise requirement in the GB, the current carrying density Q of coil should be less than 7A/mm in the magnetic tripping system
2, that is:
Q＝I/S＜7 (1)
In the formula: Q is the current carrying density of coil, A/mm
2I is the electric current that flows through coil, A; S is the sectional area of coil, mm
2The sectional area of coil is circular in general, and dynamic and static iron core also adopts circular configuration simultaneously, but because reducing of inner space guaranteeing as adopting original structure, to be difficult to then guarantee that temperature rise meets the demands under the condition that circuit breaker shell frame grade does not reduce.At above problem, coil, dynamic and static iron core and reaction spring all adopt non-circular structure in the small plastic shell type circuit breaker magnetic tripping system of the present utility model.Absorbed domestic and international advanced person's design concept during the utility model design, by Computerized three-dimensional design software and motion analysis software optimal design and modularized design have been carried out in aspects such as circuit breaker overall structure, parts moulding, transmission mechanism, on/off switch spring, the overall performance of circuit breaker and mechanical property parameter are all guaranteed more fully.
The utility model comprises the ambroin shell and the turnover line terminals that is placed in one, hot tripping system, magnetic tripping system, dynamic/static contact, operating mechanism and arc quenching system, and operating mechanism drives moving contact and realizes closing of circuit and disconnection; The magnetic release system by magnetic grip, iron core, sleeve pipe and coil form, its coil one end is gripped with fixed contact through magnetic and is connected, or directly is connected with fixed contact; The other end and heat are taken off that device is connected or are connected with binding post, and wherein: the coil of described magnetic tripping system is for by the thread non-ring shape structure that is at least a circle of copper enamel-cover.The iron core of described magnetic tripping system is made by the permeability magnetic material of a non-cylindrical.The sleeve pipe of described magnetic tripping system is a non-ring shape structure.
Describe in detail below in conjunction with accompanying drawing.
With reference to accompanying drawing, the wide ultrathin small plastic shell type circuit breaker of the 9mm that the utility model provides mainly comprises: plastic insulation shell and the left and right sides binding post that is placed in one, operating mechanism, magnetic tripping system, hot tripping system, dynamic/static contact system and arc quenching system.Wherein, left binding post is connected with the magnetic tripping system; Right binding post is connected with hot tripping system; The magnetic tripping system is electrically connected by dynamic/static contact with hot tripping system.
The magnetic tripping system that is used for short-circuit protection mainly comprises coil 2, moving iron core 3, push rod 6 etc., and as shown in Figure 3, an end of coil 2 is electrically connected with left binding post 10, and the other end is electrically connected with fixed contact 8.When short circuit current occurring in the circuit, the magnetic field of flowing through the electric current generation in the coil 2 makes iron core 3 towards the motion of static iron core 5 directions, and the push rod 6 of riveting one with moving iron core hits tripping mechanism, causes dynamic and static contact to separate, and circuit breaker disconnects.
Coil in this preferred embodiment in the magnetic tripping system, sleeve pipe, moving iron core, static iron core all adopt square structure, with respect to traditional circular configuration, have under the prerequisite of identical current carrying density, promptly have under the condition of same cross-sectional area, square structure on width less than the coil of circular configuration, sleeve pipe, moving iron core, static iron core.Therefore, the magnetic tripping system can satisfy the insulation shell inside that places the 9mm width under the condition of temperature rise.
According to practical structures and magnetic field size requirements, getting iron core is thick steel plate of 1.5mm or electrical pure iron plate; Coil shape is 6.5mm * 18.7mm rectangle; Two static iron cores rivet together with yoke respectively; The push rod of moving iron core and cold pier moulding fits together with reaction spring one and is in coil inside together, and the initial position of moving iron core is located by pedestal.Other parameters are decided according to circuit breaker rated current specification and breaker structure space size.As shown in Figure 2, the hot tripping system that is used for overload protection mainly comprise bimetal leaf 13, connect 14 firmly, adjustment screw 15 etc.One end of bimetal leaf 13 was electrically connected with right binding post 11 by hard the connection, and the other end is electrically connected with moving contact 16 by being flexible coupling.When circuit overload, the heat that overload current produces causes the bimetal leaf bending, hits trip gear, causes dynamic and static contact to separate, and circuit breaker disconnects.
The size of bimetal leaf mainly is subjected to the space size restriction of product.Contour length is generally 30mm～40mm, will consider the length of switching on during practical application, and it directly influences the size of bi-metal plate deformed displacement and produces the size of thrust; The thickness of bimetal leaf is bigger to the product influence, and the bimetal leaf thickness of miniature circuit breaker is generally between 0.5mm～1.0mm; The width of bimetal leaf is little to the properties of product influence, generally between 4mm～8mm.Suppose when passing to electric current I in the circuit that according to bimetal leaf displacement, thrust computing formula and circuit breaker inner space size, by optimal design, width, length and the thickness of getting bimetal leaf respectively are respectively 5mm, 33mm, 0.7mm.Then have:
A＝KL
2·ΔT/h (2)
F＝KEbh
2·ΔT/(4L) (3)
In the formula, K is the ratio bending of bimetallic material; E is a modulus of elasticity; L is an arm of force length; B is a width, and h is a thickness, and F is a tripping force, and Δ T is temperature rise, and A is bending displacement.
Key problem in technology point of the present utility model is:
1. the coil of this small plastic shell type circuit breaker magnetic tripping system is the non-ring shape structure of being made by copper enamelled wire material that is at least a circle;
2. the iron core of this small plastic shell type circuit breaker magnetic tripping system is that the permeability magnetic material of a non-cylindrical is made;
3. the sleeve pipe of this small plastic shell type circuit breaker magnetic tripping system is a non-ring shape structure.
Claims (4)
1. small plastic shell type circuit breaker, the turnover line terminals that comprises the ambroin shell and be placed in one, hot tripping system, magnetic tripping system, dynamic/static contact, operating mechanism and arc quenching system, operating mechanism drives moving contact and realizes closing of circuit and disconnection; The magnetic release system by magnetic grip, iron core, sleeve pipe and coil form, its coil one end is gripped with fixed contact through magnetic and is connected, or directly is connected with fixed contact; The other end is connected with hot tripping system or is connected with binding post, it is characterized in that:
The coil of described magnetic tripping system is by the thread non-ring shape structure that is at least a circle of copper enamel-cover.
2. small plastic shell type circuit breaker magnetic tripping system as claimed in claim 1 is characterized in that:
The iron core of described magnetic tripping system is made by the permeability magnetic material of a non-cylindrical.
3. small plastic shell type circuit breaker magnetic tripping system as claimed in claim 1 is characterized in that:
The sleeve pipe of described magnetic tripping system is a non-ring shape structure.
4. small plastic shell type circuit breaker magnetic tripping system as claimed in claim 1 is characterized in that:
Coil in the described magnetic tripping system, iron core, sleeve pipe all adopt square structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020265886XU CN201773802U (en) | 2010-07-15 | 2010-07-15 | Miniature plastic casing type circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020265886XU CN201773802U (en) | 2010-07-15 | 2010-07-15 | Miniature plastic casing type circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201773802U true CN201773802U (en) | 2011-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020265886XU Expired - Fee Related CN201773802U (en) | 2010-07-15 | 2010-07-15 | Miniature plastic casing type circuit breaker |
Country Status (1)
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| CN (1) | CN201773802U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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) |
| CN102969210A (en) * | 2011-08-31 | 2013-03-13 | 首瑞（北京）投资管理集团有限公司 | Static contact of circuit breaker |
| WO2013107188A1 (en) * | 2012-01-20 | 2013-07-25 | 浙江鼎威科技有限公司 | Ultrathin miniature circuit breaker |
| CN105931928A (en) * | 2016-07-06 | 2016-09-07 | 上海电科电器科技有限公司 | Conductive loop of circuit breaker |
| CN107086161A (en) * | 2017-06-10 | 2017-08-22 | 南京日新科技有限公司 | The coil of method, breaker and magnetictrip that breaker built-in current is sampled |
| CN108447747A (en) * | 2018-05-16 | 2018-08-24 | 首瑞（天津）电气设备有限公司 | A kind of small size breaker |
-
2010
- 2010-07-15 CN CN201020265886XU patent/CN201773802U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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) |
| CN102339694B (en) * | 2010-07-15 | 2014-07-09 | 北京翠祥电器元件有限公司 | Small-sized molded case circuit breaker (MCCB) |
| CN102969210A (en) * | 2011-08-31 | 2013-03-13 | 首瑞（北京）投资管理集团有限公司 | Static contact of circuit breaker |
| WO2013107188A1 (en) * | 2012-01-20 | 2013-07-25 | 浙江鼎威科技有限公司 | Ultrathin miniature circuit breaker |
| CN105931928A (en) * | 2016-07-06 | 2016-09-07 | 上海电科电器科技有限公司 | Conductive loop of circuit breaker |
| CN105931928B (en) * | 2016-07-06 | 2018-11-09 | 上海电科电器科技有限公司 | The galvanic circle of breaker |
| CN107086161A (en) * | 2017-06-10 | 2017-08-22 | 南京日新科技有限公司 | The coil of method, breaker and magnetictrip that breaker built-in current is sampled |
| CN108447747A (en) * | 2018-05-16 | 2018-08-24 | 首瑞（天津）电气设备有限公司 | A kind of small size breaker |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110323 Termination date: 20140715 |
|
| EXPY | Termination of patent right or utility model |