CN102427006A - Contact structure for low-current molded case low-voltage circuit breaker - Google Patents
Contact structure for low-current molded case low-voltage circuit breaker Download PDFInfo
- Publication number
- CN102427006A CN102427006A CN2011103490367A CN201110349036A CN102427006A CN 102427006 A CN102427006 A CN 102427006A CN 2011103490367 A CN2011103490367 A CN 2011103490367A CN 201110349036 A CN201110349036 A CN 201110349036A CN 102427006 A CN102427006 A CN 102427006A
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- Prior art keywords
- contact
- static
- circuit breaker
- conductive rod
- fixed contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/44—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet
- H01H9/446—Means for extinguishing or preventing arc between current-carrying parts using blow-out magnet using magnetisable elements associated with the contacts
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a contact structure for a low-current molded case low-voltage circuit breaker. A static conducting rod is positioned at the front-lower part of a movable contact; a static contact is positioned between the static conducting rod and the movable contact; a U-shaped lug boss of which the width is smaller than that of the static conducting rod is bent at the rearmost part of the static conducting rod in an extending manner facing to the opposite direction of current; the orientation of an opening of the U-shaped lug boss is opposite to the direction of the rearmost part current of the static conducting rod; a static contact is fixedly connected onto the U-shaped lug boss; the front end face of the U-shaped lug boss forwards extends at the same width to form a static arc striking sheet which is obliquely bent towards the direction of the movable contact and is abutted together; a distance is reserved between the static arc striking sheet and the static contact; U-shaped magnetism-increasing blocks are formed by eudipleurally upwards extending from the tail of the static conducting rod; four different functions of increasing the resistance of the circuit breaker, enhancing a self-excitation magnetic field in a contact region, absorbing an electric arc generated on the static contact during repelling open of the static contact and forming an electric repelling force between the movable contact and the static contact are achieved by one integral member; and the performance of the circuit breaker is increased.
Description
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Technical field
The present invention relates to little electric current breaker of plastic casing, be specifically related to the structure of contact terminal of little electric current breaker of plastic casing, belong to the low-voltage electrical technical field.
Background technology
Low-voltage circuit breaker is of many uses; It not only is used for the protection that backbone, branch road, circuit end etc. are made faults such as frequently not the closing of circuit and electric equipment, branch and overload, short circuit, under voltage; Also be applied to various loads, using separately and protecting like lighting loop, electric heating loop, motor circuit, capacitor loops etc.The different in kind of load selects for use the rated current of circuit breaker and protective feature also variant.So according to the character and the needed defencive function of load of load, the less breaker of plastic casing of rated current is at present also in a large amount of uses, the less breaker of plastic casing of rated current mainly be with the rated current the following breaker of plastic casing of 32A be main.Above-mentioned little electric current breaker of plastic casing is in order to realize its disjunction index; Flow through the actual current of breaker of plastic casing when reducing disjunction; The element of protection breaker of plastic casing inside is not by scaling loss; The structure of some parts in the galvanic circle of little electric current breaker of plastic casing need be done some adjustment, and the inner loop resistance of breaker of plastic casing is increased, and realizes the purpose of current limliting.
In little electric current breaker of plastic casing, in order to increase the current-limiting resistance of little electric current breaker of plastic casing, the parts of its galvanic circle are designed with three kinds of structures usually at present.First kind of structure is that fixed contact is made the shape that is similar to the snake coiling is promptly snakelike, so just can increase the length that is discharged to fixed contact from connection, thereby the resistance of increase static conductive rod increases the current limliting purpose of circuit breaker with this.Be created in the electric arc on the fixed contact when attracting dynamic/static contact to scold out in this structure, do a quiet striking sheet in addition again, other quiet striking sheet is connected the front end of fixed contact through certain mode, realize the striking function.Second kind of structure is that connection row is split type with fixed contact; In order to increase resistance; Connect between row and the fixed contact and can link together through certain mode through the heating resistor alloy of S type; Thereby increase the resistance of circuit breaker, flow through the actual current of circuit breaker when reducing disjunction, the element of protective circuit breaker inside is not by scaling loss.The third structure is that the heater element that breaker of plastic casing is inner is made similar snakelike structure or increased the loop resistance of circuit breaker at heater element end increase resistive element, thereby reaches the purpose of current limliting.
In three kinds of above structures, first kind of structure need be done extra quiet striking sheet, and quiet striking sheet will connect through certain mode, so not only will increase part but also will increase the mode of processing, and it is complicated that this kind structure is installed.After arc transfer is to the quiet striking sheet, because electric current is without fixed contact but directly through the quiet striking sheet of fixed contact front end, reduce so current-limiting resistance has a bit.Second kind of structure need be made three parts, also will connect through certain mode between per two two, and this kind structure can only realize simply increasing a kind of function of current-limiting resistance, and number of parts increases, and makes the installation of fixed contact complicated.The third structure is made serpentine configuration with heater element and is increased resistance; Because heater element is positioned at the tripping system of breaker of plastic casing; In order not influence the dropout performance of circuit breaker, it is bigger that the resistance of general heating element cannot increase, so current limitation effect neither be clearly.
Summary of the invention
The objective of the invention is to improve the deficiency of prior art; A kind of static contact structure of simple in structure, the easy for installation and little electric current breaker of plastic casing that current limitation effect is good is provided; When the circuit breaker disjunction; Can increase resistance to greatest extent, flow through the actual current of circuit breaker when reducing disjunction, the element of protective circuit breaker inside is not by scaling loss.
The technical scheme that the present invention adopts is: comprise static conductive rod, fixed contact and moving contact; Static conductive rod is positioned at the front lower place of moving contact; Fixed contact is between static conductive rod and moving contact; Be bent with the U type boss of a width less than static conductive rod at the tail end surface of static conductive rod to the opposite direction of electric current, the opening of U type boss is fixedly connected fixed contact towards opposite with the afterbody sense of current of static conductive rod on the U type boss with extending; On the front end face of U type boss, extend one to the inclination bending of moving contact direction and to lumping together the quiet striking sheet of formation, have distance between quiet striking sheet and the fixed contact with width ground forward end.
Further, the present invention extends upward a U type at the afterbody left and right symmetrically of static conductive rod and increases magnetic patch, and fixed contact is positioned at the centre that two U types increase magnetic patch.
The invention has the beneficial effects as follows:
1, static conductive rod is made serpentine configuration, and adopts the high-resistance alloy material of ferromagnetism, and the current-limiting resistance of circuit breaker is increased to greatest extent, flows through the actual current of circuit breaker when reducing the disjunction short circuit current, guarantees that the inner element of circuit breaker is not by scaling loss.
2, snakelike static conductive rod and the U type increases magnetic patch and quiet striking grid sheet is made of one the structure of formula and be provided with the boss of inverted U at the afterbody of static conductive rod; So not only reduced the part when installing; And can realize four kinds of different functions through a part, promptly (1) serpentine configuration can increase the resistance of circuit breaker; (2) the U type increases the self-excitation magnetic field that magnetic patch can strengthen voltage contact area; Quiet striking sheet is created in the electric arc on the fixed contact when (3) can attract dynamic/static contact to scold out; (4) electric current that flows through the inverted U boss after the energising is opposite with the sense of current that flows through moving contact; Can between dynamic/static contact, form electrodynamic repulsion force like this, under the situation of disjunction short circuit current, the quick pull-up moving contact of electrodynamic repulsion force meeting; Dynamic/static contact is separated fast; Thereby quick arc extinguishing, thus the current limiting performance of circuit breaker increased, the performance of circuit breaker is got a promotion greatly.
3, the U type increases the self-excitation magnetic field that magnetic patch can strengthen voltage contact area, makes the dynamic and static contact of breaker of plastic casing contact apparatus
The electric arc that produces when scolding out is transferred on the striking grid sheet fast, avoids the fixed contact scaling loss, more effectively guarantees the break performance of circuit breaker.
4, the U type increases magnetic patch and following striking grid sheet and is used, and more effectively protects fixed contact, the break performance of assurance circuit breaker.
5, after arc transfer is to the quiet striking grid sheet; This structure can guarantee that still electric current flows through this serpentine configuration; And because the quiet striking sheet of fixed contact front end has certain length, so after arc transfer was to the quiet striking grid sheet, resistance can also increase again.
Description of drawings
Below by combine accompanying drawing 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 overall structure figure of fixed contact;
Fig. 3 is the explosive view after fixed contact launches among Fig. 2;
Fig. 4 is the vertical view of Fig. 2;
Fig. 5 is the current diagram that flows through fixed contact and moving contact;
Among the figure: 1. static conductive rod; 2. fixed contact; 3. moving contact; 11. the U type increases magnetic patch; 12.U type boss; 121. quiet striking sheet; 21. cylinder; 122. circular hole.
Embodiment
As shown in Figure 1, the present invention includes static conductive rod 1, fixed contact 2 and moving contact 3, wherein, static conductive rod 1 is positioned at the front lower place of moving contact 3, and fixed contact 2 is between static conductive rod 1 and moving contact 3, and static contact structure comprises static conductive rod 1 and fixed contact 2.
Shown in Fig. 2-5, static conductive rod 1 has been made and has been similar to snakelike structure, and the material of static conductive rod 1 adopts ferromagnetic high-resistance alloy.Serpentine configuration can increase the length of static conductive rod 1, and ferromagnetic high-resistance alloy can increase the resistance of static conductive rod 1, thereby increases the current-limiting resistance of circuit breaker, flows through the actual current of circuit breaker when reducing disjunction.Be bent with the U type boss 12 of a width less than static conductive rod 1 at the tail end surface of static conductive rod 1 to the opposite direction of electric current, the opening of U type boss 12 is towards opposite with the afterbody sense of current of static conductive rod 1 with extending, promptly towards the front end of static conductive rod 1; Between U type boss 12 and the static conductive rod 1 certain height is arranged, like this, static conductive rod 1 is an overall structure with U type boss 12; The electric current that after little electric current breaker of plastic casing energising, flows through U type boss 12 is opposite with the sense of current that flows through moving contact 3; Shown in arrow among Fig. 5, between dynamic/static contact, form electrodynamic repulsion force like this, under the situation of disjunction short circuit current; The quick pull-up moving contact 3 of electrodynamic repulsion force meeting; Dynamic/static contact is separated fast, thus quick arc extinguishing, thus increased the current limiting performance of circuit breaker.U type boss 12 is provided with the circular hole 122 that is used for installing fixed contact 2, and circular hole 122 is symmetrical with the right and left of U type boss 12.Below fixed contact 2, be provided with one and be used for the cylinder 21 that matches with circular hole 122.Processing through certain way after being placed on cylinder 21 in the circular hole 122 just can make U type boss 12 be connected reliably with fixed contact 2 between the two, and like this, when breaker closing, electric current flows through moving contact 3 from static conductive rod 1 behind U type boss 12 and fixed contact 2.
On the front end face of U type boss 12, extend one to moving contact 3 direction inclination bendings and to lumping together the quiet striking sheet 121 of formation, its thickness is 2 times of U type boss 12 thicknesss of slab with width ground forward end.Like this; Static conductive rod 1, U type boss 12 and quiet striking sheet 121 threes are an overall structure; And the involutory structure that is divided into two of quiet striking sheet 121 can guarantee the thickness of quiet striking sheet 121; Prevent that dynamic/static contact from scolding out the electric arc of generation to blow quiet striking sheet 121, make the electrical arc erosion fixed contact 2 that produces once more, influence divides the performance of the circuit breaker of having no progeny.Distance between quiet striking sheet 121 and the fixed contact 2 should be suitable, otherwise quiet striking sheet 121 can not play the effect of striking.After arc transfer is to the quiet striking sheet 121, because this structure is the structure of integral type, so can guarantee that electric current flows through this serpentine configuration.Because the quiet striking sheet 121 and the static conductive rod 1 of fixed contact 2 front ends are integral types; And also has certain length; So after arc transfer was to the quiet striking sheet 121, the current-limiting resistance of circuit breaker can also increase again, flow through the actual current of little electric current breaker of plastic casing when reducing disjunction.
Extend upward a U type at the afterbody left and right symmetrically of static conductive rod 1 and increase magnetic patch 11; Make static conductive rod 1 and U type increase magnetic patch 11 and also be integral the formula structure; Like this; It is an overall structure that static conductive rod 1, U type boss 12, quiet striking sheet 121 and U type increase magnetic patch 11 4, and fixed contact is positioned at the centre position that the U type increases magnetic patch 11.The height that the U type increases magnetic patch 11 is higher than the height of U type boss 12.The U type increases the self-excitation magnetic field that magnetic patch 11 can strengthen the fixed contact zone; The electric arc that produces when the dynamic and static contact of breaker of plastic casing contact apparatus is scolded out is transferred on the quiet striking sheet 121 fast; Avoid the scaling loss of fixed contact 2, guarantee the interrupting performance of circuit breaker more effectively.
The U type increases magnetic patch 11 and is used with quiet striking sheet 121, makes fixed contact 2 obtain good protection, if having only quiet striking sheet 121 separately; Scold out when producing electric arc when dynamic/static contact so because the electric power of voltage contact area is strong inadequately, can not be fast arc transfer to quiet striking sheet 121; Cause fixed contact 2 scaling loss serious, the break performance of circuit breaker is reduced greatly, if having only the U type to increase magnetic patch 11 separately; Scold out when producing electric arc when dynamic/static contact so and since the fixed contact front do not have can transferred arc thing, then electric arc still can burn on fixed contact 2; Cause fixed contact 2 scaling loss serious, influence the break performance of circuit breaker.Be used the effect that just can reach effective striking so have only quiet striking sheet 121 to increase magnetic patch 11, more advantageously protect fixed contact 2, guarantee the break performance of circuit breaker with the U type.
Inverted U boss 12 is set on static conductive rod 1; The electric current that after little electric current breaker of plastic casing energising, flows through inverted U boss 12 is opposite with the sense of current that flows through moving contact 3; Shown in arrow among Fig. 5; Can increase the electrodynamic repulsion force between the dynamic/static contact like this, thereby also can increase the current-limiting resistance of little electric current breaker of plastic casing.
Hence one can see that, and the fixed contact among the present invention is to increase the overall structure that magnetic patch 11 4 forms by static conductive rod 1, U type boss 12, quiet striking sheet 121 and U type, and static conductive rod 1 is the resistance that serpentine configuration can increase circuit breaker; And the afterbody at static conductive rod 1 is provided with inverted U boss 12; The electric current that flows through U type boss 12 after the energising is opposite with the sense of current that flows through moving contact 3, between dynamic/static contact, forms electrodynamic repulsion force, under the situation of disjunction short circuit current; The quick pull-up moving contact of electrodynamic repulsion force meeting; Dynamic/static contact is separated fast, thus quick arc extinguishing, thus increased the current limiting performance of circuit breaker.A part can be realized four kinds of different functions simultaneously among the present invention, and is simple in structure, and function admirable is greatly improved the interrupting performance of circuit breaker.Fixed contact is easy for installation; A part is created in the electric arc on the fixed contact and strengthens voltage contact area self-excitation magnetic field, four kinds of different effects of increase electrodynamic repulsion force in the time of can realizing increasing current-limiting resistance simultaneously and attract dynamic/static contact to scold out, and the performance of circuit breaker is significantly promoted.
Claims (3)
1. one kind is used for the structure of contact terminal that little electric current is moulded case low-voltage circuit breaker; Comprise static conductive rod (1), fixed contact (2) and moving contact (3); Static conductive rod (1) is positioned at the front lower place of moving contact (3); Fixed contact (2) is between static conductive rod (1) and moving contact (3); It is characterized in that: be bent with the U type boss (12) of a width less than static conductive rod (1) width at the tail end surface of static conductive rod (1) to the opposite direction of electric current, the afterbody sense of current of the opening direction of U type boss (12) and static conductive rod (1) is opposite, fixed connection fixed contact (2) on the U type boss (12) with extending; On the front end face of U type boss (12), extend one to moving contact (3) direction inclination bending and to lumping together the quiet striking sheet (121) of formation, have distance between quiet striking sheet (121) and the fixed contact (2) with width ground forward end.
2. a kind of structure of contact terminal that little electric current is moulded case low-voltage circuit breaker that is used for according to claim 1
,It is characterized in that: extend upward a U type at the afterbody left and right symmetrically of static conductive rod (1) and increase magnetic patch (11), fixed contact (2) is positioned at the centre that two U types increase magnetic patch (11).
3. a kind of structure of contact terminal that little electric current is moulded case low-voltage circuit breaker that is used for according to claim 1
,It is characterized in that: the below of fixed contact (2) is provided with cylinder (21), fixedly matches through the circular hole (122) on cylinder (21) and the U type boss (12) between fixed contact (2) and the U type boss (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103490367A CN102427006A (en) | 2011-11-08 | 2011-11-08 | Contact structure for low-current molded case low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103490367A CN102427006A (en) | 2011-11-08 | 2011-11-08 | Contact structure for low-current molded case low-voltage circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102427006A true CN102427006A (en) | 2012-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103490367A Pending CN102427006A (en) | 2011-11-08 | 2011-11-08 | Contact structure for low-current molded case low-voltage circuit breaker |
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| Country | Link |
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| CN (1) | CN102427006A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103021754A (en) * | 2012-12-10 | 2013-04-03 | 江苏辉能电气有限公司 | Arc extinguishing system of molded case circuit breaker |
| EP3109879A1 (en) * | 2015-06-23 | 2016-12-28 | Schneider Electric Industries SAS | Device for quenching an arc in an electrical protection unit and electrical protection unit comprising such a device |
| WO2017020439A1 (en) * | 2015-08-06 | 2017-02-09 | 北京人民电器厂有限公司 | Contact system in low-voltage switch, and low-voltage switch |
| CN107342178A (en) * | 2017-08-23 | 2017-11-10 | 河北宝凯电气股份有限公司 | A kind of high-breaking miniature breaker |
| CN107342196A (en) * | 2017-08-23 | 2017-11-10 | 河北宝凯电气股份有限公司 | A kind of high breaking moulded case circuit breaker arc-control device |
| CN107359068A (en) * | 2017-08-23 | 2017-11-17 | 河北宝凯电气股份有限公司 | A kind of breaker of plastic casing with compound arc extinction performance |
| CN107393780A (en) * | 2017-08-23 | 2017-11-24 | 河北宝凯电气股份有限公司 | A kind of miniature circuit breaker of strong breaking capacity |
| CN107393777A (en) * | 2017-08-23 | 2017-11-24 | 河北宝凯电气股份有限公司 | A kind of breaker of plastic casing with high breaking performance |
| CN107424856A (en) * | 2017-08-23 | 2017-12-01 | 河北宝凯电气股份有限公司 | A kind of flashboard type contact of breaker arc-extinguishing mechanism |
| CN107808790A (en) * | 2017-11-17 | 2018-03-16 | 河南森源电气股份有限公司 | Breaker of plastic casing structure of contact terminal magnet assemblies |
| CN107845551A (en) * | 2017-09-21 | 2018-03-27 | 天津市百利电气有限公司 | Splashing electric arc can be introduced to the mold cased circuit breaker of arc-chutes |
| CN109494133A (en) * | 2019-01-09 | 2019-03-19 | 常熟开关制造有限公司(原常熟开关厂） | A kind of contact structure of breaker |
| CN112185780A (en) * | 2020-10-12 | 2021-01-05 | 西屋低压开关设备(镇江)有限公司 | Contact arc striking pin |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103021754A (en) * | 2012-12-10 | 2013-04-03 | 江苏辉能电气有限公司 | Arc extinguishing system of molded case circuit breaker |
| EP3109879A1 (en) * | 2015-06-23 | 2016-12-28 | Schneider Electric Industries SAS | Device for quenching an arc in an electrical protection unit and electrical protection unit comprising such a device |
| FR3038124A1 (en) * | 2015-06-23 | 2016-12-30 | Schneider Electric Ind Sas | ARC EXTINGUISHING DEVICE IN AN ELECTRICAL PROTECTION APPARATUS AND ELECTRICAL PROTECTION APPARATUS COMPRISING SUCH A DEVICE |
| WO2017020439A1 (en) * | 2015-08-06 | 2017-02-09 | 北京人民电器厂有限公司 | Contact system in low-voltage switch, and low-voltage switch |
| CN107393780B (en) * | 2017-08-23 | 2020-04-28 | 河北宝凯电气股份有限公司 | Miniature circuit breaker with strong breaking capacity |
| CN107424856B (en) * | 2017-08-23 | 2020-04-28 | 河北宝凯电气股份有限公司 | Flashboard circuit breaker contact arc extinguishing mechanism |
| CN107359068A (en) * | 2017-08-23 | 2017-11-17 | 河北宝凯电气股份有限公司 | A kind of breaker of plastic casing with compound arc extinction performance |
| CN107393780A (en) * | 2017-08-23 | 2017-11-24 | 河北宝凯电气股份有限公司 | A kind of miniature circuit breaker of strong breaking capacity |
| CN107393777A (en) * | 2017-08-23 | 2017-11-24 | 河北宝凯电气股份有限公司 | A kind of breaker of plastic casing with high breaking performance |
| CN107424856A (en) * | 2017-08-23 | 2017-12-01 | 河北宝凯电气股份有限公司 | A kind of flashboard type contact of breaker arc-extinguishing mechanism |
| CN107342178B (en) * | 2017-08-23 | 2020-07-24 | 河北宝凯电气股份有限公司 | High-breaking miniature circuit breaker |
| CN107342196B (en) * | 2017-08-23 | 2020-06-09 | 河北宝凯电气股份有限公司 | Arc extinguishing device of high-breaking plastic casing type circuit breaker |
| CN107359068B (en) * | 2017-08-23 | 2020-05-22 | 河北宝凯电气股份有限公司 | Moulded case circuit breaker with compound arc extinguishing performance |
| CN107342196A (en) * | 2017-08-23 | 2017-11-10 | 河北宝凯电气股份有限公司 | A kind of high breaking moulded case circuit breaker arc-control device |
| CN107393777B (en) * | 2017-08-23 | 2020-04-28 | 河北宝凯电气股份有限公司 | Moulded case circuit breaker with high breaking performance |
| CN107342178A (en) * | 2017-08-23 | 2017-11-10 | 河北宝凯电气股份有限公司 | A kind of high-breaking miniature breaker |
| CN107845551A (en) * | 2017-09-21 | 2018-03-27 | 天津市百利电气有限公司 | Splashing electric arc can be introduced to the mold cased circuit breaker of arc-chutes |
| CN107808790A (en) * | 2017-11-17 | 2018-03-16 | 河南森源电气股份有限公司 | Breaker of plastic casing structure of contact terminal magnet assemblies |
| CN109494133A (en) * | 2019-01-09 | 2019-03-19 | 常熟开关制造有限公司(原常熟开关厂） | A kind of contact structure of breaker |
| CN112185780A (en) * | 2020-10-12 | 2021-01-05 | 西屋低压开关设备(镇江)有限公司 | Contact arc striking pin |
| CN112185780B (en) * | 2020-10-12 | 2022-08-16 | 西屋低压开关设备(镇江)有限公司 | Contact arc striking pin |
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Application publication date: 20120425 |