CN105762038A - Circuit breaker contact system and circuit breaker - Google Patents
Circuit breaker contact system and circuit breaker Download PDFInfo
- Publication number
- CN105762038A CN105762038A CN201610286899.7A CN201610286899A CN105762038A CN 105762038 A CN105762038 A CN 105762038A CN 201610286899 A CN201610286899 A CN 201610286899A CN 105762038 A CN105762038 A CN 105762038A
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- Prior art keywords
- conducting strip
- contact
- busbar
- conducting
- gap
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
- H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
- H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
- H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
- H01H1/226—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member having a plurality of parallel contact bars
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- Breakers (AREA)
Abstract
The invention discloses a circuit breaker contact system and a circuit breaker.The circuit breaker contact system comprises a contact support, a rotary support shaft, a busbar, multiple conducting strip groups and flexible connecting pieces; each conducting strip group comprises two or three conducting strips, each conducting strip is provided with a contact, and the conducting strip groups are arranged in parallel and rotatably supported on the contact support through the rotary support shaft, so that the contacts form a contact surface which can make contact with an outer conductor to achieve electric conduction; the two ends of the flexible connecting pieces are electrically connected with the conducting strips and the busbar respectively, a first gap is formed between every two adjacent conducting strip groups, a second gap is formed between every two adjacent conducting strips in each conducting strip groups, the first gaps are larger than the second gaps, and the contacts arranged on the conducting strips which are located on the two sides of each conducting strip group are arranged in the mode of being far away from each other and deflected in the arranging direction of the conducting strips.Accordingly, the phenomenon that the contact pressure of the conducting strips and the outer conductor is decreased due to the fact that the contacts are overheated to generate fusion welding is avoided.
Description
Technical field
The invention belongs to electric switch technical field, particularly relate to a kind of breaker contact system and chopper.
Background technology
Chopper is the pith of electrical power distribution apparatus, is mainly used in industrial low-voltage power system, is used for connecting and electric current in disjunction mains-power circuit and protection circuit and power-supply device are from the harm of the faults such as overload, under-voltage, short circuit, single-phase earthing.Along with power engineering is to improving constantly that power supply and equipment for power transmission and distribution require, the performance requirement for circuit protecting switch is also more and more higher, and miniaturization, high-performance, modularity, high reliability is the main development direction of present stage omnipotent breaker.
Chopper is divided into primary cut-out and low-voltage circuit breaker by its use scope.Low-voltage circuit breaker, also known as automatic switch, is commonly called as " air switch ", and it is a kind of existing manual divide-shut brake function, can automatically carry out again the electrical equipment of decompression, under-voltage, overload and short trouble intellectual analysis, protection.In chopper is actually used; when it is in closure state; if there is short trouble in circuit; the needs of property protection, then require that it has the protection feature of deferred action by choice, namely can bear, in the short time before short circuit current is cut-off, the impact that short circuit current brings; when such guarantee lower end branch road breaks down; removed fault by lower end chopper as far as possible, reduce power-off scope, reduce loss.
Contact system is the important component part of chopper, and in contact system, the design of touch spring parameter and contact end pressure value is very crucial, is directly connected to the tolerance performance in short-term of chopper.Improve chopper KA Rms value and can increase the selective protection scope of B class chopper, be effectively improved the reliability of electrode difference protection, it is prevented that the generation of the accidents such as tripping operation of bypassing the immediate leadership.Under short-circuit current rush, huge electrodynamic repulsion force can cause contact pressure between contact to reduce and cause overheated or even melting welding, makes chopper cannot continue normal operation；Even also can result in dynamic and static contact to scold out, cause hard arc to burn contact and chopper.
It is known that, increase fingertip quantity and can be effectively reduced electrodynamic repulsion force, and then make chopper when not improving contact end pressure, higher short circuit tolerance electric current can be passed through, Chinese patent 200710025637.6 discloses a kind of moving contact of breaker structure, in order to improve KA Rms, contact supporting adopts the scheme increasing contact blade quantity, detailed description of the invention is for removing conducting strip and contact supporting all-in-one-piece isolation grid, fixed support and grid is used to separate contact, thinning isolation grid is adopted to increase the accommodation space of contact, and then increase the way of number of conductors.This method and prior art have the disadvantage in that
Contact number is increased on the one hand in limited space, the scheme of this increase contact quantity will certainly cause that contact thickness reduces, too much contact quantity and excessively thin contact thickness in turn result in the space being positioned at below contact for laying touch spring and significantly reduce, cause that the ratio of height to diameter of spring is excessive, or too much contact quantity can cause the lower thickness of isolation grid, when causing closing a floodgate, there is tilt phenomenon in contact, the spring contacted between contact and contact support is made to occur crooked, and spring is always at the limit pressured state during touch spring long time continuous working, easily lost efficacy because of tired, cause that contact pressure is reduced by touch spring during closing position, and then cause that contact end pressure reduces；
Contact end pressure reduces on the other hand; the contact surface contact resistance contacted with each other increases; reliability of electrical connection reduces; contact temperature rise increases; reduce the resistance fusion welding of contact, cause that chopper temperature rise is too high, make chopper shortening in service life, reliability lower; and then KA Rms reduces, the degree of accuracy that the scope of selective protection just diminishes, extreme difference coordinates reduces or lost efficacy；And because the increase of part, structure is too compact, causes installation difficulty, not easily realizes automatization.
Accordingly, it would be desirable to the breaker contact system of a kind of improvement and chopper.
Summary of the invention
For effectively solving one or more defect above-mentioned existed in prior art, the invention provides a kind of breaker contact system and chopper, it is capable of increasing the end pressure value of breaker contact system, the bigger electrodynamic repulsion force produced by short circuit current can be overcome, and the structure of optimized breaker contact system, and control one or more purpose in the temperature rise of breaker contact system and chopper.
To achieve these goals, this invention takes following technical scheme:
According to an aspect of the invention, it is provided a kind of breaker contact system, including: contact supporting；Revolving support axle；Busbar；And multiple conducting strip group, each described conducting strip group includes two or three conducting strips, each described conducting strip is provided with contact, the plurality of conducting strip group laid out in parallel is also rotatably supported on described contact supporting by described revolving support axle, makes multiple described contact form the contact surface that can contact conduction with external conductor；Flexible connecting member, described flexible connecting member two ends electrically connect with the plurality of conducting strip and described busbar respectively；Wherein, between two adjacent described conducting strip groups, there is the first gap, each described conducting strip group has the second gap between two adjacent conducting strips, and described first gap is more than the second gap, described conducting strip group is positioned at the contact on the conducting strip of both sides in the orientation of described conducting strip, biases setting away from each other.
By making gap between adjacent conducting strip group more than gap between adjacent conductive sheet in each conducting strip group identical for the gap between original each conducting strip changing into, the quantity of conducting strip and contact can be effectively increased, the structure of optimized breaker contact system, thus increasing its current capacity, improve the breaker contact system tolerance to specified KA Rms, improve the overall electric conductivity of breaker contact system and current-carrying capacity, avoid owing to KA Rms causes being scolded between conducting strip and external conductor opening the contact system temperature rise increase problem caused.
And owing to the contact being positioned in conducting strip group on the conducting strip of both sides to be biased in the orientation of described conducting strip setting away from each other, the multiple contacts in each conducting strip group are made to form predetermined gap each other, the air gap in each conducting strip group can be increased on the one hand, improve the mobility of each contact surrounding air in conducting strip group, when being conducive to chopper in running order, the heat of contact distributes, prevent when chopper carries out pressure test, owing to the contact gap between them on the multiple conducting strips in a conducting strip group is too small, the contact caused occurs melting welding and silver to precipitate out phenomenon, and cause conducting strip that adhesion phenomenon occurs, conducting strip actual quantity is caused to reduce the problem making purpose of breaker failure or test failure, improve chopper in high temperature environments appearance index does not drop, and then reduce chopper temperature rise.
According to an aspect of the present invention, described conducting strip has and arranges face for the contact connecting described contact, is positioned at the contact of the conducting strip of both sides and arranges face and bias setting in the orientation of described conducting strip away from each other in described conducting strip group.The mode that contact arranges face biasing is adopted to be biased contact to ensure the simple in construction of conducting strip while avoiding contact melted.
According to an aspect of the present invention, also include the first isolation part and the second isolation part, described first isolation part is between adjacent conducting strip group, so that keeping the first gap between described adjacent conducting strip group, between the conducting strip that described second isolation part is adjacent in conducting strip group, so that keeping the second gap between described adjacent conducting strip.Make to keep respectively between adjacent conducting strip group and adjacent conducting strip the first gap and the second gap by arranging the first isolation part and the second isolation part, to provide conducting strip is spacing and lateral support effect, it is ensured that conducting strip with the structural stability in the contact process of external conductor.
According to an aspect of the present invention, described first isolation part and/or described second isolation part include the lobe formed on described conducting strip or the separator being separately provided.First isolation part and the second isolation part diversification of forms is set, and the installing space of the conducting strip in realizing breaker contact system increase while ensure that conducting strip is subject to effective support, will not with the contact process of external conductor in tilt phenomenon occurs.
According to an aspect of the present invention, described busbar is provided with flowing through the electric current deflection section that the sense of current of this busbar deflects, with the active force producing to make the contact of described conducting strip move towards described external conductor to described flexible connecting member.Increase the contact pressure between conducting strip and external conductor.
According to an aspect of the present invention, described electric current deflection section is the rake being arranged on described busbar near the position of described flexible connecting member.The rake formed by busbar body constitutes electric current deflection section, ensures the simple in construction of busbar while making the active force that flexible connecting member produces to make the contact of described conducting strip to move towards described external conductor by busbar, easy to process, and reduces cost.
According to an aspect of the present invention, described electric current deflection section is formed by the groove being opened on described busbar, and the bearing of trend of described groove is parallel to described contact surface.The electric current deflection section being easy to make busbar by offering the form of groove forms suitable angle of inclination, and then makes the electric current after deflection promote conducting strip and contact to move towards external conductor the flexible connecting member stronger electrodynamic repulsion force of generation.
According to an aspect of the present invention, the cross section of described groove is V-type or U-shaped.The gradient of the electric current deflection section so formed is more beneficial for the electrodynamic repulsion force that the electric current after deflection is stronger to flexible connecting member generation.
According to an aspect of the present invention, the degree of depth of described groove is set to residing for it the 1/2 to 2/3 of busbar area thickness.Make the electric current after deflection, in the groove region of busbar, flexible connecting member be produced stronger electrodynamic repulsion force, thus providing bigger electric repulsion for flexible connecting member.
According to an aspect of the present invention, described groove includes the multiple grooves being arranged on described busbar along the sense of current, and adjacent two described grooves are positioned on the opposite side of described busbar and offset one from another.So that flexible connecting member is subject to the electrodynamic repulsion force of multiple superposition, thus the contact pressure increased between conducting strip and external conductor.
According to an aspect of the present invention, described breaker contact system also includes: elastic component, and described elastic component is correspondingly arranged between described each conducting strip group and the support of described contact.Adopting one group of conducting strip to share the mode of an elastic component so that the installing space of elastic component increases, what make elastic component curls up ratio reduction, promotes the performance of elastic component, it is to avoid elastic component premature fatigue failures.
Providing a kind of chopper according to another aspect of the present invention, described chopper includes described breaker contact system.
Accompanying drawing explanation
The drawings below of the application is used for understanding the application in this as the part of the application.Embodiment shown in accompanying drawing and description thereof are used for explaining principles of the invention.In the accompanying drawings:
Fig. 1 is the overall structure schematic diagram illustrating breaker contact system according to embodiments of the present invention；
Fig. 2 is the decomposition texture schematic diagram illustrating breaker contact system；
Fig. 3 is the part-structure schematic diagram illustrating breaker contact system；
Fig. 4 is the main TV structure schematic diagram of the one group of conducting strip illustrating breaker contact system；
Fig. 5 illustrates the perspective view that one group of conducting strip of Fig. 4 is sandwiched between intermediate plate；
Fig. 6 is the lateral structural representation of the conducting strip illustrating Fig. 5；
Fig. 7 is the busbar structure schematic diagram illustrating breaker contact system；
Fig. 8 is another busbar structure schematic diagram illustrating breaker contact system；
Fig. 9 is another busbar structure schematic diagram illustrating breaker contact system；
Figure 10 is the part-structure generalized section illustrating breaker contact system gate-dividing state；
Figure 11 is the part-structure generalized section illustrating breaker contact system "on" position；
Figure 12 is the operation principle schematic diagram illustrating breaker contact system.
Detailed description of the invention
Feature and the exemplary embodiment of various aspects of the invention are described more fully below.In the following detailed description, many details have been explained and illustrated, in order to complete understanding of the present invention is provided.But, it will be apparent to those skilled in the art that the present invention can implement when some details in not needing these details.It is only used to the description of embodiment below provide being better understood from the present invention by the example of the description present invention.The invention is not restricted to any concrete configuration set forth below, but in any amendment, replacement and the improvement that cover the structure to the present invention without departing from the spirit of the invention and parts are made.In the the accompanying drawings and the following description, it does not have illustrate known structure and technology, to avoid causing unnecessary puzzlement to understanding technical scheme.
In order to be more fully understood that the present invention, breaker contact system and chopper below in conjunction with Fig. 1-12 couples embodiment of the present invention illustrated are described in detail.
Refer to Fig. 1; the overall structure schematic diagram of the breaker contact system of the embodiment of the present invention illustrated; breaker contact system 100 is located in chopper; for controlling the voltage/current in chopper disjunction/Guan Bi circuit, and there is the protection feature of deferred action, namely can bear, in the short time before short circuit current is cut-off, the impact that short circuit current brings; ensure when lower end branch road breaks down; removed fault by lower end chopper as far as possible, reduce power-off scope, reduce loss.
Specifically, breaker contact system 100 has multiple conducting strip 20 (being also commonly referred to as contact or fingertip), multiple conducting strips 20 are electrically connected with busbar 40 by flexible connecting member 30, and multiple conducting strips 20 adopt laid out in parallel mode and are rotatablely arranged on contact supporting 10 by revolving support axle 80 (shown in Fig. 2), each conducting strip 20 is respectively arranged with contact 21 (being also commonly referred to as movable contact or silver contact), the contact surface that multiple contacts 21 are formed can contact conduction or separate power-off with external conductor, so that chopper may be at energising or off-position.
Contact supporting 10 is for frame-like structures and adopts insulant, the multiple conducting strips 20 being fixed thereon can be played the effect of insulating supporting, contact supporting 10 two ends are respectively through side plate and adopt screw fixation method to be connected to a pair auxiliary fixing plate 51,52, certain auxiliary fixing plate 51,52 can also be connected with contact supporting 10 by other means, or serves as auxiliary fixing plate 51,52 by other structures.The two ends of revolving support axle 80 will be arranged in multiple conducting strip 20 thereon by the axis hole 13 preset respectively on two auxiliary fixing plates 51,52 and be located between two auxiliary fixing plates 51,52, make auxiliary fixing plate 51,52 coordinate with contact supporting 10 and jointly provide support limit effect for multiple conducting strips 20.
Busbar 40 and contact supporting 10 are fixed in chopper also by a fixed mount 60, and adopt rotary way to be connected by rotating shaft 53 between fixed mount 60 with contact supporting 10.Electrically connected by flexible connecting member 30 between multiple conducting strips 20 and busbar 40.Flexible connecting member 30 is flexible connection structure, it is preferably copper connecting line or other flexible connection structure being made up of it, for ensureing good electric conductivity, flexible connecting member 30 two ends are connected by mode respectively that preferably employ welding with multiple conducting strips 20 and busbar 40, make to realize between multiple conducting strip 20 and busbar 40 by the transition conduction that is flexible coupling.
Connected mode between flexible connecting member 30 and conducting strip 20 and busbar 40 and the shape of itself are not limited by certain present invention, such as connecting hole can also be set on flexible connecting member 30, additionally corresponding connecting hole configuration connecting pin on busbar 40 and conducting strip 20, is coordinated by connecting pin and connecting hole and adopts the mode of screw threads for fastening to be attached fixing to it.
Breaker contact system also includes contact guard shield 70; contact guard shield 70 is U-shaped platy structure; work for not interfering with conducting strip 20; it encloses is located at the contact surface position below place that the contact 21 of multiple conducting strip 20 is formed; contact guard shield 70 is adopted the mode being screwed and is attached fixing by the screwed hole preset on auxiliary fixing plate 51,52; there is provided insulation and the effect of protection further for multiple conducting strips 20, the quantity that arranges of certain contact guard shield 70 does not limit, it is possible to for one or more.
Refer to Fig. 2, the decomposition texture schematic diagram of the breaker contact system of the embodiment of the present invention illustrated, as shown in the figure, conducting strip 20 is laminated structure, its head, towards contact supporting 10 lateral bend, forms a recess, and the corresponding contact position with external conductor in contact 21 is arranged on the end of below conducting strip 20 head, multiple contacts 21 laid out in parallel can form a contact surface, and conducting strip 20 realizes contacting conduction with external conductor or separating power-off by the contact surface that contact 21 is formed.
The position on the lower side, middle part of each conducting strip 20 is provided through for the axis hole 24 for revolving support axle 80 traverse, after multiple conducting strips 20 are arranged on described contact supporting 10 by revolving support axle 80, its head captured is in the U-shaped space that contact supporting 10 and connected biside plate are formed, and it can rotate around revolving support axle 80.Certainly, quantity and the shape of conducting strip 20 are not limited by the present invention, use needs and installation site to be correspondingly adjusted according to it.
Refer to Fig. 3, it is shown that the part-structure schematic diagram of breaker contact system of the embodiment of the present invention, as it can be seen, wherein, multiple conducting strips 20 are configured to multiple conducting strip group 201.Schematically illustrate conducting strip group 201 in the present embodiment and include two conducting strips 20, and form the first gap between adjacent two conducting strip groups 201, form the second gap between adjacent conducting strip 20 in each conducting strip group 201, and the first gap is more than the second gap.Conducting strip 20 quantity in certain conducting strip group 201 arranges and is not limited to this, can also need adaptively to carry out increase and decrease according to practical application to adjust, such as when the conducting strip quantity in contact system is odd number, multiple conducting strips might also be configured into two conducting strips and constitute a conducting strip group and/or the form of three conducting strip one conducting strip groups of composition and the form that an independent conducting strip and the mixing of multiple conducting strip group are arranged.
Breaker contact system 100 also includes the first isolation part and the second isolation part, and this first isolation part is arranged between the conducting strip group 201 that the chien shih of two adjacent conducting strip groups 201 is adjacent and keeps the first gap；Second isolation part is arranged between adjacent two conducting strip 20 in each conducting strip group 201 so that it is between keep the second gap.Make to be spaced from each other between adjacent conducting strip 20 and adjacent conducting strip group 201 by arranging the first isolation part and the second isolation part, the structure of conducting strip 20 is supported, it is prevented that it occurs rolling, and prevents conducting strip 20 place heat build-up in work.Exemplarily, above-mentioned first isolation part is dividing plate 11, and the second isolation part is intermediate plate 22, and dividing plate 11 adopts electric arc high temperature resistant, resistance to and the higher thermosetting plastics of structural strength to make.
Intermediate plate 22 is located between two conducting strips 20 in each conducting strip group 201, intermediate plate 22 is shaped to identical with the shape of conducting strip 20, and its thickness is less than the thickness of dividing plate 11, for preventing conducting strip 20 in the course of the work together with accessory septa 11 due to persistently overheating and occur crooked, cause the problem that the contact force between external conductor reduces.
By multiple conducting strips 20 are configured to multiple conducting strip group 201, and the dividing plate between the adjacent conductive sheet 20 in each conducting strip group 201 is replaced with thinner intermediate plate 22, retain the dividing plate 11 between each two conducting strip group 201 simultaneously, the installing space of conducting strip 20 can be increased, thus increasing the quantity of conducting strip 20, breaker contact system is optimized setting, make conducting strip and external conductor contact process can overcome bigger electrodynamic repulsion force, be effectively improved the tolerance performance in short-term of breaker contact system.Additionally, by substituting dividing plate 11 with intermediate plate 22, the multiple conducting strips 20 in conducting strip group 201 are made to have thinner gross thickness, and without arranging independent elastic component for each conducting strip 20, but make the multiple conducting strips 20 in conducting strip group 201 share elastic component, such as, in the present embodiment, each conducting strip group 201 uses one/group spring to provide elastic force for it.
By retaining the dividing plate 11 between adjacent conducting strip group 201, can under the auxiliary of intermediate plate 22, conducting strip 20 for laid out in parallel provides solid fixing reliably and position-limiting action lateral, ensure the stability of multiple conducting strip structure, solution conducting strip rolls the conducting strip caused and contacts the problem that the contact force in the process conducted electricity reduces with external conductor, thus improving the reliability of breaker contact system.Further, in order to optimize space, simplify the structure of breaker contact system, and make conducting strip 20 be operatively supported, it is preferred to adopt integral structure to be arranged on contact supporting 10 on dividing plate 11.
The first isolation part and the second isolation part function in breaker contact system are that conducting strip is carried out limited support, and in the embodiment cited by the present invention, the first isolation part is dividing plate 11, and the second isolation part is intermediate plate 22.But it should be noted that the structure of the first isolation part and the second isolation part is not limited to this, for instance, the first isolation part and the second isolation part can also is that the lobe formed on conducting strip 20 or other separator being separately provided in breaker contact system.It is equally possible carries out lateral support and then ensures the stability of multiple conducting strip structure multiple conducting strips, it is to avoid produce the problem that in its process contacting conduction with external conductor, contact force reduces.
nullFurther，Please also refer to Fig. 4，The structural representation of the conducting strip group 201 of the embodiment of the present invention illustrated，And Fig. 5，The perspective view of the conducting strip group 201 of the embodiment of the present invention illustrated，As shown in the figure，Conducting strip 20 arranges face 25 connecting terminal 21 by contact formed thereon，And the contact being positioned on the conducting strip 20 of both sides in conducting strip group 201 biases setting away from each other in the orientation of multiple conducting strips 20，In the present embodiment，The contact 21 on two conducting strips 20 in each conducting strip group 201 is respectively facing dividing plate 11 direction of its both sides and biases a preset distance，Refer to the lateral structural representation of the conducting strip of the embodiment of the present invention shown in Fig. 6，Two conducting strips 20 in each conducting strip group 201 adopt stamping forming mode that contact arranges face 25 and are respectively facing dividing plate 11 direction (i.e. direction away from each other) of its both sides and bias a predeterminable range (shown in Fig. 3)，So that being formed at the contact 21 that contact arranges on face 25 be together biased setting，Make formation predetermined gap between adjacent contact 21.In order to make contact ambient air circulation more preferably, conducting strip structure is simpler, it is preferable that contact 21 is evenly distributed on multiple conducting strip 20 formed contact surface place.Above-mentioned preset distance can set according to the gap needing reservation between the contact of breaker contact system in real work, by contact is biased preset distance, it is possible to make to keep between adjacent contact predetermined gap.In the present embodiment by the contact of conducting strip 20 is arranged face 25 toward each other away from direction biasing preset distance, the contact 21 making each conducting strip group 201 forms gap each other and is easy to air flowing, other modes can also be adopted in other examples to be biased the multiple contacts in each conducting strip group processing, it is simple to it keeps good air circulation each other.
Adopt the mode of uniform contact, the air gap at contact 21 place of each conducting strip group 201 can be increased, improve the mobility of air, such that it is able to the temperature rise controlled in breaker contact system work, be conducive to distributing of contact 21 heat, and then appearance index does not drop in raising chopper in high temperature environments.Additionally, when chopper carries out resistance test in short-term, avoid the gap between due to two conducting strips 20 in a conducting strip group 201 too small, contact 21 place's melting welding is caused to cause two conducting strip 20 adhesion problems when silver precipitates out, conducting strip 20 relative populations reduce and cause test termination situation generation, improve the tolerance performance in short-term of breaker contact system.
Being uniformly distributed of certain above-mentioned contact is not absolute, is to realize ensureing contact 21 ambient air circulation so that forming predetermined gap between the adjacent contacts 21 in each conducting strip group 201 by conducting strip 20 biasing in both sides in conducting strip group 201 in the present embodiment.And the present embodiment schematically show only conducting strip group 201 there is the situation of two conducting strips 20, in other embodiments, such as when each conducting strip group has three conducting strips, only the contact being positioned in conducting strip group on the conducting strip of both sides need to be biased a predeterminable range towards the dividing plate direction of its both sides, and be in the conducting strip in the middle of conducting strip group and do not do bias treatment, equally possible reach the purpose of the present invention, realization makes to keep between contact adjacent in conducting strip group predetermined gap, certainly when each conducting strip group comprises three conducting strips, the predetermined gap kept between its adjacent contact can be the same or different.
Busbar 40 (shown in Fig. 2) can be provide the copper bar electrically connected or aluminum to arrange for chopper with the switch in each shunt circuit, and its one end is that cylindrical shape is used for being connected conduction with outside terminal, and the other end is tabular or block structure.The shape of certain busbar 40 is not limited to this, and in other embodiments, busbar 40 can also be overall block structure.
Busbar 40 place is configured with electric current deflection section 44, the sense of current for flowing through electric current deflection section 44 place deflects, flexible connecting member 30 can be created towards the active force away from the motion of busbar 40 direction by the electric current of this yawing moment, make this flexible connecting member 30 that multiple conducting strip 20 can be driven to move, thus the contact force increased between multiple conducting strip 20 and external conductor, namely the end pressure between contact is increased, so that multiple conducting strips 20 and external conductor contact process can overcome bigger electrodynamic repulsion force, improve chopper KA Rms value.
Specifically, refer to Fig. 7, it is shown that the busbar structure schematic diagram of breaker contact system of the embodiment of the present invention.As shown in the figure, electric current deflection section 44 is the rake that busbar 40 body is arranged in the present embodiment, this rake is arranged on the busbar 40 position near flexible connecting member 30, and the angle formed between rake and flexible connecting member 30 is less than 90 degree, the electric current realizing being flowed in busbar 40 by flexible connecting member 30 is flowing through the deflection of rake generation direction, produce flexible connecting member 30 to make it be directed away from the electric repulsion of busbar 40 direction motion, thus driving the contact part of multiple conducting strip 20 to rotate around revolving support axle 80 (shown in Figure 12) towards near busbar 40 side.
Further, refer to Fig. 8, it is shown that another busbar structure of the embodiment of the present invention.nullAs shown in the figure，Busbar 40 forms electric current deflection section 44 by offering groove 41 at it near the bottom surface place of flexible connecting member 30，The shape of cross section of groove 41 is inverted V-shaped，And the bearing of trend of groove 41 is parallel to the contact surface that above-mentioned multiple contact 21 is formed，The electric current being flowed in busbar 40 by flexible connecting member 30 is made to flow through the deflection of generation direction, groove 41 region，Flexible connecting member 30 is produced electric repulsion，Flexible connecting member 30 is made to be directed away from the motion of busbar 40 direction，Owing to multiple conducting strips 20 are connected with flexible connecting member 30，And it is rotatably fixed on contact supporting 10，Therefore the flexible connecting member 30 being connected to multiple conducting strip 20 lower end passes through leverage，The contact part that can promote multiple conducting strip 20 rotates around revolving support axle 80 towards near busbar 40 side，Thus the contact force (i.e. contact end pressure) increased between the plurality of conducting strip 20 and external conductor.The form that arranges of certain groove 41 is not limited to this, in other embodiments of the invention, the shape of cross section of groove 42 can also be set to other shapes inverted U-shaped or that busbar 40 place can be made to form electric current deflection section, and groove 41 can not also be opened in the bottom surface place of busbar 40, as long as its setting can meet the electric current deflection section 44 making busbar 40 be formed and make flexible connecting member 30 be subject to being directed away from the active force of busbar 40 direction motion.
Refer to Fig. 9, another kind of busbar structure schematic diagram according to embodiments of the present invention.As it can be seen, in another embodiment of the invention, busbar 40 arranges multiple groove, and specifically, busbar 40, along electric current flow direction therein, arranges one or more groove after groove 41, and makes groove opposition be crisscross arranged.So-called opposition is crisscross arranged, it is situation shown in Fig. 9, groove 43 is opened in the upper end surface of busbar 40, the shape of cross section making groove 41 and groove 43 is configured the form opposed in opposite directions, and groove 43 cell wall adjacent with groove 41 is for be arrangeding in parallel, it is simple to electric current circulates better in busbar.By this structure, flexible connecting member 30 can be made to be subject to the electric repulsion of multiple superposition, increase flexible connecting member 30 and be directed away from the motion amplitude in busbar 40 direction, the revolving force that the multiple conducting strips 20 being attached to rotate towards busbar 40 side along revolving support axle 80 can be increased further, and then the contact force between multiple conducting strip 20 and external conductor can be increased.
One groove 43 is set after Fig. 9 is only shown in groove 41, multiple groove can also be set certainly after groove 41, form multiple electric currents deflection section 44 that the electric current flowing through busbar 40 turns to, it is possible to increase the contact force between multiple conducting strips 20 and external conductor further.
Further, flow through, for increasing as far as possible, the electric repulsion that flexible connecting member 30 is produced by the electric current at electric current deflection section 44 place, the degree of depth of groove 41 is set to it residing for busbar 40 the 1/2 to 2/3 of region place thickness, as shown in Figure 8.nullWhen contact system stands short circuit current，When electric current flows through busbar 40，It is overall that electric current spreads all over busbar 40，Circulate to flexible conductive element 30 direction (owing to being that alternating current is so electric current has positive and negative two circulating directions，Namely flow to busbar 40 from flexible conductive element 30 or flow to flexible conductive element 30 from busbar 40，But both direction is identical to the direction of the electric repulsion that flexible conductive element 30 produces)，When electric current flows through 46 place, busbar front end，The electric current line formed tentatively is compressed，For producing better electrodynamic repulsion force，A groove 41 is set up at busbar 40 place，Groove 41 makes its residing busbar 40 region place thickness reduce，Electric current line is made again to be compressed，The magnetic line of force is strengthened again，The degree of depth of groove 41 is set to busbar 40 residing for it region place thickness more than 1/2，The effect to electric current line recompression can be played.
It is controlled by the thickness at busbar 40 region place residing for groove 41, what namely control groove 41 offers the degree of depth, make the maximum current that the maximum carrying capacity at busbar 40 region place residing for groove 41 circulates less than busbar front end 46 place, prevent busbar front end 46 place current-carrying capacity excessive, busbar heating increases, cause breaker body caloric value to increase, ensure that the current-carrying capacity of busbar 40 will not generate heat time less with this and have a strong impact on chopper overall performance.
And owing to the degree of depth of groove 41 is set to this scope, the angle formed between electric current deflection section 44 and flexible conductive element 30 can so that electric current circulates in busbar 40, when flowing through region residing for groove 41, the incline direction that its level flows to by effectively changing into along two parallel-slopes of electric current deflection section 44 circulates, flexible connecting member 30 can be produced bigger electrodynamic repulsion force by consequent electric current yawing moment, flexible connecting member 30 can be made to provide bigger revolving force for multiple conducting strips 20, make multiple conducting strip 20 and external conductor contact process can overcome bigger electrodynamic repulsion force.
Further, for ensureing the current flowing in busbar 40, and make electric current form preferably yawing moment, and increase flows through the electric repulsion that flexible connecting member 30 is produced by the electric current at electric current deflection section 44 place as far as possible, also the thickness at the electric current section of deflection 44 place can be carried out uniform thickness setting.By the electric current section of deflection 44 is arranged to equal thickness so that flow through the trafficability performance that electric current deflection section 44 electric current that occurs direction to deflect can keep good, too much loss will not be produced, and weaken the electrodynamic repulsion force to flexible connecting member 30 of the electric current after deflection.
Further, for making electric current be partial to section 44 at electric current, flexible connecting member is produced sufficiently large electrodynamic repulsion force, also the thickness of the electric current section of deflection 44 can be set smaller than or equal to busbar 40 near the thickness of the connecting portion 45 of flexible connecting member 30, and make groove 41 the distance keeping less between position and flexible connecting member 30 is set.Because when electric current deflection section 44 place flows through larger current, distance between magnetic field intensity and groove 41 and flexible connecting member 30 that busbar 40 surface produces is inversely proportional to, therefore to flexible connecting member 30 is produced bigger repulsion, can be set to the original position of the electric current section of deflection 44 overlap with the flexible connecting member 30 terminal position on busbar 40, thus flexible connecting member 30 is produced bigger electrodynamic repulsion force.
Refer to Figure 10, the part-structure generalized section of the breaker contact system gate-dividing state of the embodiment of the present invention illustrated, in breaker contact system 100, corresponding multiple conducting strip groups 201 are respectively arranged with elastic component, this elastic component is resisted against between each conducting strip group 201 and contact supporting 10, for contacting in conducting process at multiple conducting strips 20 with external conductor, provide contact force for conducting strip 20.
Elastic component is preferably helical spring 90, specifically, the recess that two conducting strips 20 in each conducting strip group 201 and the intermediate plate 22 being located between two conducting strips 20 are collectively forming is provided with the support slot 23 (please also refer to Fig. 5) for holding helical spring 90, one end of helical spring 90 is resisted against in this support slot 23, the other end is resisted against in the groove 12 that the corresponding support slot 23 of contact supporting 10 is arranged, and provided position-limiting action by the dividing plate 11 of each conducting strip group 201 both sides from both sides for being located at helical spring 90 therebetween, sharing an elastic component by each conducting strip group 201 is that elastic component increases installing space, so that the ratio that curls up of elastic component reaches preferred range.
Said structure makes the installing space of the helical spring 90 in breaker contact system 100 add one times, so that curling up of helical spring 90 reduces one times than the spring in compared to existing technology, and then the structural strength of helical spring 90 can be strengthened so that it is service life and tolerance fatigability are greatly promoted.
Further, the elastic component at each conducting strip group 201 place can also be adopted and be arranged by mutually sheathed or parallel arranged form by two helical springs 90 different for diameter, breaker contact system further enhances service life and the tolerance fatigability of elastic component, so that can overcome bigger electrodynamic repulsion force.
Simultaneously, each conducting strip group 201 is resisted against the mode of contact supporting 10 by an elastic component, the position that arranges that can make support slot 23 is totally lifted up, the acting force arm of conducting strip 20 is lengthened by helical spring 90 centered by revolving support axle 80, thus when not increasing end pressure, by increasing the moment of the active force that helical spring 90 provides, breaker contact system 100 realizes increasing the contact pressure between conducting strip 20 and external conductor, so that can overcome bigger electrodynamic repulsion force.
The structure of certain elastic component is not limited to this, for instance elastic component can also be set to torsion spring or other can provide the elastic structure of active force for multiple conducting strips 20.
When breaker contact system 100 is in gate-dividing state, helical spring 90 two ends are resisted against in support slot 23 and groove 12 and are in micro-compressive state, be in and separate off-position between multiple conducting strips 20 and external conductor；Please also refer to Figure 11, it is shown that the part-structure generalized section of breaker contact system "on" position of the embodiment of the present invention.As shown in the figure, when breaker contact system 100 needs work turn-on current, pass through closing operation, make contact supporting 10 can rotate by axle centered by rotating shaft 53 (shown in Fig. 1), helical spring 90 two ends are resisted against in support slot 23 and groove 12 and are in complete compressive state multiple conducting strips 20 are applied elastic force, make to keep good contacting between multiple conducting strip 20 and external conductor.
Please also refer to Figure 12, the operation principle schematic diagram of the breaker contact system provided according to embodiments of the present invention, below in conjunction with operation principle schematic diagram, the action principle and effect that arrange groove 41 generation are illustrated.
After combined floodgate, current flowing direction in breaker contact system 100 is as shown in the figure, when breaker contact system 100 is when running into short circuit current (or being called abnormal big electric current), electric current is after entering busbar 40, when flowing through in electric current deflection section 44, direction deflects, even if the circulating direction of electric current is partial to section 44 place at electric current becomes similar parabolical bottom-up circulating direction, flexible connecting member 30 can be produced an electric repulsion (Lorentz force) by the electric current that therefore this electric current deflection section 44 place flows through.
nullSimultaneously，Electric current also produces an electric compensating power (Lorentz force) when flexible connecting member 30 itself，Electric compensating power and electric repulsion direction owing to flexible connecting member 30 being produced are consistent，The power that flexible connecting member 30 is subject to is made to be overlapped，The power of two superpositions makes flexible connecting member 30 move towards the direction farther away from busbar 40，Owing to busbar 40 and contact supporting 10 are fixed by fixed mount 60，Multiple conducting strip 20 lower ends then can be produced pulling force by flexible connecting member 30，Then multiple conducting strips 20 are arranged on revolving support axle 80，Due to lever principle，Multiple conducting strips 20 are located at revolving support axle 80 above part and can be rotated towards busbar 40 side around revolving support axle 80，Thus increasing the contact force being between multiple contact 21 thereon and external conductor，And then the end pressure of breaker contact system can be increased，Make breaker contact system 100 can overcome the bigger electrodynamic repulsion force because short circuit current produces at external conductor and conducting strip 20 contact surface place.
A kind of chopper is also provided for, including above-mentioned breaker contact system 100 according to another embodiment of the present invention.Its structure and advantage have been described above, and do not repeat them here.
Claims (6)
1. a breaker contact system, including:
Contact supporting；
Revolving support axle；
Busbar；And
Multiple conducting strip groups, each described conducting strip group includes two or three conducting strips, each described conducting strip is provided with contact, the plurality of conducting strip group laid out in parallel is also rotatably supported on described contact supporting by described revolving support axle, makes multiple described contact form the contact surface that can contact conduction with external conductor；
Flexible connecting member, described flexible connecting member two ends electrically connect with the plurality of conducting strip and described busbar respectively；
Wherein, between two adjacent described conducting strip groups, there is the first gap, each described conducting strip group has the second gap between two adjacent conducting strips, and described first gap is more than the second gap, described conducting strip group is positioned at the contact on the conducting strip of both sides in the orientation of described conducting strip, biases setting away from each other.
2. breaker contact system according to claim 1, wherein, described conducting strip has and arranges face for the contact connecting described contact, is positioned at the contact of the conducting strip of both sides and arranges face and bias setting in the orientation of described conducting strip away from each other in described conducting strip group.
3. breaker contact system according to claim 1, also include the first isolation part and the second isolation part, described first isolation part is between adjacent conducting strip group, so that keeping the first gap between described adjacent conducting strip group, between the conducting strip that described second isolation part is adjacent in conducting strip group, so that keeping the second gap between described adjacent conducting strip.
4. breaker contact system according to claim 3, wherein, described first isolation part and/or described second isolation part include the lobe formed on described conducting strip or the separator being separately provided.
5. breaker contact system according to claim 1, also includes:
Elastic component, described elastic component is correspondingly arranged between described each conducting strip group and described contact supporting.
6. a chopper, wherein, described chopper includes the breaker contact system described in any one of claim 1 to 5.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286899.7A CN105762038B (en) | 2016-04-29 | 2016-04-29 | Breaker contact system and breaker |
| PCT/CN2017/081444 WO2017186061A1 (en) | 2016-04-29 | 2017-04-21 | Circuit breaker contact system and circuit breaker |
| MX2018012426A MX2018012426A (en) | 2016-04-29 | 2017-04-21 | Circuit breaker contact system and circuit breaker. |
| ZA2018/06529A ZA201806529B (en) | 2016-04-29 | 2018-10-02 | Contact system of circuit breaker and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610286899.7A CN105762038B (en) | 2016-04-29 | 2016-04-29 | Breaker contact system and breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105762038A true CN105762038A (en) | 2016-07-13 |
| CN105762038B CN105762038B (en) | 2018-01-05 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610286899.7A Active CN105762038B (en) | 2016-04-29 | 2016-04-29 | Breaker contact system and breaker |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN105762038B (en) |
| MX (1) | MX2018012426A (en) |
| WO (1) | WO2017186061A1 (en) |
| ZA (1) | ZA201806529B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017186061A1 (en) * | 2016-04-29 | 2017-11-02 | 首瑞（天津）电气设备有限公司 | Circuit breaker contact system and circuit breaker |
| EP3330988A1 (en) * | 2016-12-05 | 2018-06-06 | LSIS Co., Ltd. | Air circuit breaker |
| CN111157941A (en) * | 2020-01-19 | 2020-05-15 | 广东电网有限责任公司计量中心 | Device and method for quickly switching and checking primary winding of power transformer |
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| CN112750803B (en) * | 2019-10-31 | 2023-05-16 | 株洲中车时代电气股份有限公司 | Busbar terminal and IGBT power module |
| CN113990717A (en) * | 2020-07-27 | 2022-01-28 | 上海量乘机电科技有限公司 | Moving contact system of circuit breaker |
| FR3122944B1 (en) * | 2021-05-11 | 2023-11-10 | Hager Electro Sas | Mobile contact configured to be integrated into a circuit breaker |
| CN114267561B (en) * | 2021-11-12 | 2023-03-31 | 中国电子科技集团公司第二十九研究所 | Delay circuit design method and delay circuit structure of microwave integrated circuit |
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- 2016-04-29 CN CN201610286899.7A patent/CN105762038B/en active Active
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- 2017-04-21 WO PCT/CN2017/081444 patent/WO2017186061A1/en active Application Filing
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| EP3330988A1 (en) * | 2016-12-05 | 2018-06-06 | LSIS Co., Ltd. | Air circuit breaker |
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| CN111157941A (en) * | 2020-01-19 | 2020-05-15 | 广东电网有限责任公司计量中心 | Device and method for quickly switching and checking primary winding of power transformer |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017186061A1 (en) | 2017-11-02 |
| ZA201806529B (en) | 2019-06-26 |
| MX2018012426A (en) | 2019-07-04 |
| CN105762038B (en) | 2018-01-05 |
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