CN101399137B - Low-voltage plastic case breakers - Google Patents
Low-voltage plastic case breakers Download PDFInfo
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- CN101399137B CN101399137B CN2007101516031A CN200710151603A CN101399137B CN 101399137 B CN101399137 B CN 101399137B CN 2007101516031 A CN2007101516031 A CN 2007101516031A CN 200710151603 A CN200710151603 A CN 200710151603A CN 101399137 B CN101399137 B CN 101399137B
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- rotating shaft
- contact
- joint construction
- contact support
- circuit breaker
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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
- H01H1/20—Bridging contacts
- H01H1/2041—Rotating bridge
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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
- H01H73/045—Bridging contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
- H01H2003/326—Driving mechanisms, i.e. for transmitting driving force to the contacts using bearings
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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
- H01H2009/0094—Details of rotatable shafts which are subdivided; details of the coupling means thereof
Abstract
A monopole or multi-pole low-pressure plastic-cast breaker is provided with the rotating shaft of a rolling bearing; the rotating shaft that is connected with and drives the moving contact bridge of each pole is arranged on a plastic-case base by the rolling bearing; the rolling bearing is installed in the bearing base via the bearing base and the bearing cover board on the plastic-case base, so as to increase the movement precision and rotation flexibility of the rotating shaft components; therefore, the operating force needed by an operating mechanism is reduced and the short-circuit breaking capacity of the breaker is enhanced; the arc breaking time is shortened and the contact properties of the moving and stationary contact are improved. In addition, the rotating shaft and the contact support on the shaft are independent elements with uniform shape and size and can be substituted for each other; therefore, the low-pressure plastic-case breakers with different poles can use the same rotating shaft and contact support and the rotating shaft components of breakers with different poles can be assembled on one production line, which greatly increases the productivity and reduces the production cost.
Description
Technical field
The present invention relates to a kind of low-pressure plastic shell circuit breaker, particularly a kind of low-pressure plastic shell circuit breaker that adopts the electrodynamic repulsion force principle to carry out current limliting, be equipped with in the shell by the contact system of dynamic and static contact to constituting, wherein moving contact adopts the structure of cut-offfing of rotation contact bridge type double break point.
Background technology
Breaker of plastic casing is a kind of low-voltage circuit breaker with mold insulation shell, or claims generally to be used for the branch switch as low-voltage distribution system by MCCB (Molded-case Circuit Breaker), belongs to the class in the most frequently used low-voltage circuit breaker.This class breaker of plastic casing comprises that mainly the double-contact contact system that cut-offs structure that adopts double break point, the grid sheet arc quenching system that utilizes air-blowing effect striking, operating mechanism, employing impact electromagnet structure and reach the heat-magnetic-type release of current limliting purpose and input, output connection device.All parts of breaker of plastic casing all are contained on its plastic casing that can snap together, and have both played the supporter effect, play insulating effect again, and operating grip is positioned at the top of moulding shell.
In the contact system of breaker of plastic casing, the rotating shaft system of moving contact is a vitals, and it is made up of contact holding components, operation driver part, rotating axis component.The effect of contact holding components described here is that moving contact is fixed in the rotating shaft by the contact support.The effect of described operation driver part is that the power of the operating mechanism of circuit breaker and tripping mechanism and Motion Transmission are arrived rotating shaft system, thereby realizes operating mechanism and the operation control of tripping mechanism countershaft and the control of threading off of circuit breaker.Under the control of operating mechanism, when rotating shaft was rotated under the drive of operation driver part, rotating shaft can drive the moving contact swing, thereby made moving contact and the fixed contact closure or the disconnection of circuit breaker; Under the control of tripping mechanism, rotating shaft can drive the disconnection action that moving contact is finished circuit breaker.The effect of rotating axis component described here then is that rotating shaft is bearing in moulding on the shell base of circuit breaker pivotally, to guarantee the operate as normal of rotating shaft.
As everyone knows, the double-contact contact system adopts the structure of cut-offfing of rotating dual-breakpoint, has better current limliting effect than single-break structure.Yet the rotation flexibility of its rotating shaft is the key that influences the closure/opening speed of the required operating physical force size of the operating mechanism of circuit breaker, contact holding components, and the kinematic accuracy of rotating shaft is the key of the contact performance between the dynamic and static contact of influence.The size of operating physical force described here not only influences the break performance of circuit breaker product, but also directly influences the volume and weight of circuit breaker product.Because operating physical force is big more, hard more during operation, for bearing operating physical force load, have to strengthen the size of moulding stressed members such as shell, have enough mechanical strengths to guarantee stressed member, also increased manufacturing cost thus.Closure/opening speed described here, be short circuit breaking capacity, electrical endurance and the functional reliability that influences circuit breaker, the key element of fail safe, closure/opening speed is fast more, short circuit breaking capacity is strong more, electric arc is more little to the ablative degradation of contact, the electrical endurance of product is long more, and functional reliability, fail safe are high more.Kinematic accuracy described here, the synchronism of the closure/disconnection of each utmost point contact of the contact performance of dynamic and static contact, multipole circuit breaker and the harmony of each utmost point contact contact force all there is direct influence, the synchronism of the closure/disconnection of each utmost point contact is poor more, get over the equipment of easy burn-out circuit breaker load end, the harmony of each utmost point contact contact force is poor more, then the contact resistance of each utmost point contact differs big more, causes the serious or cisco unity malfunction of the big utmost point temperature rise of contact resistance.Contact performance described here is meant the size of the contact resistance after the crimping of dynamic and static contact phase, and contact resistance is big more, and then contact performance is poor more, and temperature rise is serious more.Because contact performance is relevant with the size and the contact position of contact force, therefore, the rotation precision of rotating shaft is very responsive for contact performance.
Existing low-pressure plastic shell circuit breaker, the rotating axis component of its contact system is sliding bearing, because rotating shaft and mould the structure that has adopted sliding bearing between the shell base, there is serious sliding-frictional resistance between them, serious problems such as cause thus that operating physical force is big, rotating shaft is rotated dumb and kinematic accuracy is low.In the structure of the rotating axis component of existing low-pressure plastic shell circuit breaker, typical case and use most often single shaft sliding support structure the most, be characterized in the multipole contact support is connected together, repressed or be injection molded into a whole rotating shaft with thermoset plastics, this rotating shaft relies on two or more the semicircular bearing pedestals on the base to support, the upper end is pushed down with the bearing cap of a semicircle, fixes with the center of rotation that guarantees rotating shaft, and rotating shaft and bearing pedestal are sliding friction.Because must be gapped between the bearing pedestal of rotating shaft and its lower end and the bearing cap of upper end, then if excesssive gap, the center of rotation of rotating shaft will change, and is difficult to guarantee the kinematic accuracy of rotating shaft; If instead too small, then rotate dumb, friction is big, thereby make that the operating physical force of whole circuit breaker is big, the closure/opening speed of circuit breaker is slow, has a strong impact on the speed of breaking electric arc, thereby causes the short circuit breaking capacity of circuit breaker to reduce.The processing dimension of the size of countershaft and bearing pedestal, bearing cap and matching requirements are very high in addition, and designing requirement is difficult to be guaranteed during production.
As disclosed in the patent document 92111529.6 (Granted publication number for CN1028935C) be a kind of rotating axis component structure of typical known low-pressure plastic shell circuit breaker, three utmost points of moving contact or multipole contact support are independent cylinders in its contact system, have one or have two holes symmetrically in cylindrical side, with one or two slender axles the lower link of operating mechanism and three utmost points or multipole contact support are coupled together, realize the closure and the opening operation of circuit breaker.The morpheme size and the assembly precision of the rotating shaft of this kind structural requirement, bearing pedestal, bearing cap are very high, and production efficiency reduction, manufacturing cost are raise.Rotating shaft because of elongated, rigidity is poor, so stressed easy deformation, make that the contact kinematic accuracy is low, cause contact pressure decline especially easily away from the utmost point of operating mechanism, contact pressure between moving contact and the fixed contact can not get reliable assurance, thereby cause contact resistance big, temperature rise the no power phenomenon may occur, burn out the problems such as equipment of load end when situation is serious.For addressing this problem, some low-voltage circuit breaker installs an auxiliary switching-in mechanism additional for the utmost point away from operating mechanism specially, is used for guaranteeing contact terminate pressure, has so not only improved cost, and functional reliability has also descended.
The development of industrial economy and the raising of people's living standard, promoted the extensive use of modern low-voltage distribution system greatly, developing rapidly of low-voltage distribution cause, not only require low-voltage circuit breaker miniaturization, modularization as low-voltage distribution electrical equipment, and require to have high-performance, particularly require to have high break performance.The enterprise that makes breaker of plastic casing at present both at home and abroad all is faced with when satisfying miniaturization, modularization, is difficult to keep and improve the puzzlement of the connecting-disconnecting function of small low-voltage breaker of plastic casing.The rotating shaft of above-mentioned existing low-voltage circuit breaker and the structure of moulding shell base employing sliding bearing, owing to there is very big frictional force between them, thereby cause that rotating shaft rotates that operating physical force dumb, circuit breaker is big, closure/opening speed is slow, short circuit breaking capacity is low, the kinematic accuracy of moving contact is low, the contact force of the closure of each utmost point contact/disconnection poor synchronization, each utmost point contact is unbalanced, serious problems such as the contact performance difference of dynamic and static contact are difficult to keep the connecting-disconnecting function that requires and reach the due effect of cut-offfing.
In addition, rotating shaft and contact are supported repressed or injection moulding forms one, so the rotating shaft of the circuit breaker of different numbers of poles because its length is different with the quantity of contact support, must be shaped with different injection molds, have increased production cost greatly, have reduced production efficiency.
Summary of the invention
The objective of the invention is to overcome the various defectives of above-mentioned prior art, provide a kind of and simple in structurely be easy to make, cost is low, reliable operation and the long low-voltage circuit breaker of new generation of electrical endurance.Owing in rotating shaft, adopted rolling bearing dexterously, changing sliding bearing is rolling bearing, not only operating physical force is little for this circuit breaker, on/off speed is fast, short circuit breaking capacity strong, the kinematic accuracy height of moving contact, and each utmost point moving contact highly versatile, contact performance are good, thereby the synchronism of the closure/disconnection of each extremely dynamic and static contact is good.
[0010]To achieve these goals, the present invention has adopted following circuit breaker technical scheme.
Have mould shell base 5 and with mould the mold insulation shell that housing-plate constitutes of moulding that shell base 5 matches, in described shell, be provided with the contact system and the operating mechanism thereof of executive circuit closure/opening operation, described contact system is made up of fixed contact parts, moving contact part, arc control device and the arc-chute that is installed in the arc control device, described moving contact part is included in operating mechanism and drives and can realize down and contact of fixed contact parts or the double-contact movable contact bridge that separates, with a rotating axis component 30 that the moving contact part of consecutive roots is fixedlyed connected.Described rotating axis component 30 comprises that at least one is used to install the contact support 1 of movable contact bridge, at least one is used to connect the rotating shaft 3 of consecutive roots contact support 1, the rolling bearing 4 that at least one is used for supporting shaft 3, described rotating axis component 30 is installed in by rolling bearing 4 and moulds on the shell base 5, to improve the kinematic accuracy and the kinematic dexterity of rotating axis component 30.Described bearing 4 is installed in the bearing pedestal 6,7 by bearing pedestal 6,7 and the bearing cover 8,9 moulded on the shell base 5, thereby rotating axis component 30 pivotally, neatly, accurately is installed to moulding in the shell base 5 of circuit breaker.Should meet the following conditions simultaneously between the number of poles N of the number G of the number F of the number E of described contact support 1, rotating shaft 3, rolling bearing 4 and circuit breaker:
E=N; With
N-1≤F≤N+1; With
1≤G≤F。
According to the specific embodiment of the present invention, described rotating shaft 3 is provided with a fitting surface 32, interior annular distance interference fit by on this fitting surface 32 and the rolling bearing 4 is assembled together rolling bearing 4 and rotating shaft 3, guarantees that they are loosening all the time under service load.End at the two ends of described rotating shaft 3 is provided with joint construction 31, the two ends of described contact support 1 be provided with rotating shaft 3 on the joint construction that is complementary of joint construction 31, rotating shaft 3 is connected and fixed by described joint construction that is complementary and contact support 1.Joint construction 31 in the rotating shaft 3 mates mutually with the joint construction in the contact support 1, connects by above-mentioned coupling assembling, and rotating shaft 3, rolling bearing 4 are assembled into rotating axis component 30 with contact support 1.
According to the present invention, described joint construction can be a channel shaped axis hole joint construction.Described channel shaped axis hole joint construction comprises: support at its groove that axially is provided with of lateral surface upper edge of the axle shape end at rotating shaft 3 two ends, at contact 1 end face along its axial hole that axially is provided with and in the medial surface upper edge of axial hole its raised line that axially is provided with; Groove on the axle shape end of rotating shaft 3 and contact are supported the interior raised line of axial hole on 1, mate mutually with the relation of groove/raised line or raised line/groove; Rotating shaft 3 is by the axial hole in its shape end embedding contact support 1, realization is connected and fixed with contact support 1, and cooperate contact force and the groove/raised line provide that the barrier force that provides is provided by axis hole, make their obtain assembly precision, and loosening under service load.
According to the present invention, described joint construction is annular knurl oblique crank Z hole joint construction also.Described annular knurl oblique crank Z hole joint construction comprises: in the axle shape end at rotating shaft 3 two ends, at the end face of contact support 1 along its axial hole that axially is provided with and on the lateral surface of axle shape end and/or the annular knurl that is provided with on the medial surface at axial hole; Cross sectional shape, the size of the axial hole in the cross sectional shape of the end of rotating shaft 3, size and the contact support 1 are mated mutually; Rotating shaft 3 is by the axial hole in its shape end embedding contact support 1, realization is connected and fixed with contact support 1, and cooperate contact force and the annular knurl face provide that the frictional resistance that provides is provided by axis hole, make their obtain assembly precision, and loosening under service load.
According to the present invention, described joint construction is polygonal axis hole joint construction also.Described polygonal axis hole joint construction comprises: be polygonal shape end in the cross section at rotating shaft 3 two ends and be polygonal axial hole at the end face of contact support 1 along cross sectional shape that it axially is provided with; Cross sectional shape, the size of the axial hole in cross sectional shape, size and the contact support 1 of the axle shape end of rotating shaft 3 are mated mutually; Rotating shaft 3 embeds contact by its shape end and supports axial hole on 1, realizes and being connected and fixed of contact support 1, and cooperates the contact force and the polygonal that provide that the barrier force that provides is provided by axis hole, makes their obtain assembly precision, and loosening under service load.
According to the present invention, described joint construction is interference fit profile shaft hole joint construction also.Described interference fit profile shaft hole joint construction comprises: support 1 end face along its axial hole that axially is provided with in the axle shape end at rotating shaft 3 two ends with at contact; Rotating shaft 3 is passed through its shape end with the axial hole in the form embedding contact support 1 of interference fit, being connected and fixed of realization and contact support 1, and it is not, make them obtain assembly precision, and loosening under service load by contact force and frictional resistance that the axis hole interference fit provides.
According to the present invention, described joint construction is adhesion type axis hole joint construction also, is included in the axle shape end at rotating shaft 3 two ends and supports its axial hole that axially is provided with of 1 end face upper edge at contact; Cross sectional shape, the size of cross sectional shape, size and the axial hole of described axle shape end are complementary, and be bonding with bonding agent between them; Rotating shaft 3 embeds the axial hole in the contact support 1 and inject bonding agent between them by its shape end, realizes being adhesively fixed of rotating shaft 3 and contact support 1, makes them obtain assembly precision, and not loosening under service load.
According to the present invention, described joint construction can also adopt hole axle joint construction, and its shape end is arranged on contact and supports on 1, and axial hole is arranged in the rotating shaft 3.The structure of the axial hole of hole axle joint construction and axle shape end can adopt any one form in above-mentioned channel shaped, annular knurl shape, polygonal, interference fit type and the adhesion type.
According to the present invention, described joint construction can adopt injection molding way to realize again, is about to axle 3 and is fixed in when the injection moulding in the plastics that contact supports as inserts.
The material of described rotating shaft 3 is to guarantee its indeformable metal or high strength, plastics of easily being shaped under the situation of stand under load.Described bearing cover 8,9 can be an element independently, also can be made into integration with the housing-plate of moulding of circuit breaker.
The shape and size of the rotating shaft 3 of each utmost point also are unified, the shape and size of the contact support 1 of each utmost point are unified, to guarantee that the assembling between all contact supports 1 and all rotating shafts 3 is interchangeable, the circuit breaker of different numbers of poles can be adopted with a kind of rotating shaft 3, with a kind of contact support 1 with a kind of rolling bearing 4, make same production line can assemble the rotating axis component 30 of the circuit breaker of different numbers of poles.
Description of drawings
Fig. 1 is the schematic diagram of one embodiment of the present of invention, and the expression rotating shaft system is assemblied in the molded view of moulding in the shell of circuit breaker.
Fig. 2 is the multipole moving contact of Fig. 1 and the schematic diagram of rotating axis component thereof.
Fig. 3 is the assembling schematic diagram of an embodiment of rotating shaft of the present invention and bearing.
Fig. 4 is the structural representation of the rotating shaft of Fig. 3, for clarity sake, has removed bearing.
Fig. 5 is the structural representation of an embodiment of the bearing pedestal of circuit breaker of the present invention.
Fig. 6 a and Fig. 6 b are the structural representations of an embodiment of the bearing cap of circuit breaker of the present invention.
Embodiment
Describe the specific embodiment of the low-pressure plastic shell circuit breaker of the rotating shaft with rolling bearing of the present invention in detail below in conjunction with accompanying drawing, the description of following circuit breaker embodiment of the present invention is just as nonrestrictive example.
Shown in Figure 1 is a multipolar low-voltage breaker of plastic casing mould shell base 5, it be installed on it with mould the mold insulation shell that the housing-plate (not shown) constitutes circuit breaker jointly of moulding that shell base 5 cooperates.Moulding on the shell base 5, be provided with the tripping mechanism and the termination that is used to be connected inlet wire and outlet of the contact system of the arc control device that belong to 95111529.6 described the sort of types and arc extinguishing assembly, executive circuit closure/opening operation and operating mechanism thereof, control circuit breaker trip.The core component that focuses on circuit breaker of the present invention---comprise the improvement of contact assembly and rotating axis component,, improved the technical indicators such as break performance of low-pressure plastic shell circuit breaker comprehensively by improving the rotating axis component of moving contact dexterously at interior contact system.
Specific embodiment shown in Fig. 1,2,5,6, the moving contact rotating axis component 30 of low-voltage circuit breaker of the present invention is made up of rotating shaft 3 and 2 rolling bearings 4 that are used for supporting shaft 3 that 31,2 of contact supports that are used to install moving contact are used to connect each utmost point contact support 1.Rolling bearing 4 is installed in and moulds on the shell base 5 by moulding at least one bearing pedestal 6 (with 7) on the shell base 5 and at least one bearing cap 9 (with 8).
As shown in Figure 3 and Figure 4, the interior annular distance and the fitting surface in the rotating shaft 3 32 of rolling bearing 4 are interference fit, by this interference fit, rolling bearing 4 and rotating shaft 3 are assembled together, and make them be convenient to assemble and do not become flexible all the time under service load.The end at rotating shaft 3 two ends is provided with joint construction 31, the two ends of contact support 1 be provided with rotating shaft on the joint construction (not shown) that is complementary of joint construction 31, by described joint construction, rotating shaft 3 and each utmost point contact support 1 are connected and fixed, can make them be convenient to assembling, and under service load, cannot not remain looseningly.Joint construction in joint construction in the rotating shaft and the contact support mates mutually, connects by above-mentioned coupling assembling, and rotating shaft, rolling bearing and contact support are assembled into rotating axis component.Because each utmost point contact support 1 is the standard component that produces with same mould, each utmost point rotating shaft 3 and rolling bearing 4 are the standard component of same shape and size, and the shape and size of their joint construction also are unification, interchangeable, therefore, the circuit breaker of different numbers of poles can adopt with a kind of rotating shaft 3, with a kind of contact support 1 with a kind of rolling bearing 4, the rotating axis component 30 of the circuit breaker of different numbers of poles can be assembled on same production line, thereby has improved production efficiency greatly and reduced manufacturing cost.
The embodiment of the low-voltage circuit breaker of the present invention shown in Fig. 1,2,5 is a three-pole breaker, and the number of the contact support 1 of its rotating axis component 30 is that 3, the number of rolling bearing 4 are 2, and the number of rotating shaft 3 is 2.Relation in the number of poles N of low-voltage circuit breaker of the present invention and the rotating axis component 30 between the number G of the number F of the number E of contact support 1, rotating shaft 3 and rolling bearing 4 should meet the following conditions simultaneously:
N＝E
N-1≤F≤N+1 and
1≤G≤F。
When G=1, rolling bearing 4 is cantilevered feature for the supporting construction of rotating shaft 3, the advantage of this structure be simple in structure, cost is low, its shortcoming is that the service load that bears is little, the kinematic accuracy of rotating shaft is low, so, it only is applicable to the one pole low-pressure plastic shell circuit breaker of little load, low precision, perhaps cooperates other supporting structure to use together.
When G=2, rolling bearing 4 is best for the support effect of rotating shaft 3, can satisfy requirement simple in structure, that cost is low, can guarantee the kinematic accuracy of rotating shaft again, can also bear bigger service load.Therefore, should first-selected this technical scheme when the design rotating axis component.
When G 〉=3,, there is the manufacturing cost height though rolling bearing 4 is good for the support effect of rotating shaft 3, problems such as assembling difficulty, and G is big more, and these problems are outstanding more, therefore, the scheme of G 〉=3 is only applicable to service load intensity big or rotating shaft 3 and needs extra situation about strengthening.
The value of F is set according to the needs of the topology layout of low-pressure plastic shell circuit breaker.When F=N-1, the two ends of rotating axis component 30 are contact and support 1 (as shown in Figure 1, 2) to be the most frequently used form, it not only simply, but also economical.When F=N or F=N+1, the one or both ends of rotation member 30 are rotating shaft 3, and this form is applicable to the situation that needs to be provided with in the one or both ends of rotating axis component 30 bearing.
Shown in Fig. 1,5,6a, 6b, moulding on the shell base 5, be provided with two bearing pedestals 6 and 7, bearing pedestal 6 and 7 is a semi-circular recesses, the external diameter of its diameter and rolling bearing 4 is complementary.Bearing cap 8 (with 9) is provided with semi-circular recesses 81 (with 91), and the external diameter of its diameter and rolling bearing 4 is complementary.Be connected by semi-circular recesses 6 and 81 (7 and 91), the outer shroud of rolling bearing 4 be fixed on mould in the shell base 5.Adopt this mounting structure, not only easy for installation, but but also very economical ground obtains higher installing and locating precision and enough bearing capacitys.Described bearing cover can be an element independently, also can be made of one with the housing-plate of moulding of circuit breaker.
Bearing cap 8 and 9 shown in Fig. 6 a, the 6b is respectively an example of independent component.The execution mode of another kind of replaceable embodiment shown in the drawings is, the mould housing-plate (not shown) of bearing cap 8 (with 9) with breaker of plastic casing is integrated, by the moulding shell base 5 and mould being fixedly connected of housing-plate of circuit breaker, rolling bearing 4 is installed in the bearing pedestal 6 (with 7).
As shown in Figure 4, the joint construction 31 in the end of rotating shaft 3 is a channel shaped axis hole joint construction, is characterized in: be provided with a shape end at rotating shaft 3 two ends, on the lateral surface of axle shape end, be axially arranged with groove or raised line along it; Be provided with the axial hole (not shown) in the end of contact support 1, on the medial surface of described axial hole, be axially arranged with raised line or groove along it; Groove (or raised line) on the lateral surface of rotating shaft 3 ends and contact support the interior raised line (or groove) of axial hole on 1 to be complementary, be that groove is joined raised line, or raised line is joined groove, by the axial hole in the axle shape end embedding contact support 1 of rotating shaft, rotating shaft 3 and contact support 1 are connected and fixed, cooperate the contact force and the groove/raised line that provide that the resistance shelves power that provides is provided by axis hole, make rotating shaft 3 and contact support 1 to obtain good assembly precision, and under service load, cannot not remain looseningly.
Another embodiment of the present invention is to adopt the alternative channel shaped axis hole of annular knurl oblique crank Z hole joint construction joint construction, specifically, on the lateral surface of the axle shape end at rotating shaft 3 two ends, be provided with annular knurl, on the medial surface of the axial hole of the end of contact support 1, can be provided with (also can not being provided with) annular knurl, the axle shape end of rotating shaft 3 embeds axial hole, rotating shaft 3 and contact support 1 are connected and fixed, and the frictional resistance that cooperates the contact force provide and annular knurl to provide by axis hole, make them obtain enough assembling position precision, and under service load, cannot not remain looseningly.
Another embodiment of the present invention is to adopt the alternative channel shaped axis hole of polygonal axis hole joint construction joint construction, be characterized in: the cross sectional shape of the axle shape end of rotating shaft 3 is identical polygonal with the cross sectional shape of the axial hole of the end of contact support 1, embed axial hole by roller end, rotating shaft 3 and contact support 1 are connected and fixed, and by the contact force of axis hole cooperation and the resistance shelves power of polygonal cooperation, make them obtain enough assembly precisions, and under service load, cannot not remain looseningly.
Have again, another embodiment of the present invention is to adopt the alternative channel shaped axis hole of interference fit profile shaft hole joint construction joint construction, be characterized in: the axle shape end and the contact at rotating shaft 3 two ends support that the axial hole of 1 end is an interference fit, by the axial hole in the axle shape end embedding contact support 1 of rotating shaft 3, rotating shaft 3 and contact support 1 are connected and fixed, and the contact force and the frictional resistance that provide by the axis hole interference fit, make them obtain enough assembly precisions, and under service load, cannot not remain looseningly.
Another embodiment of the present invention is to adopt the alternative channel shaped axis hole of adhesion type axis hole joint construction joint construction, be characterized in: the axial hole that the axle shape end at rotating shaft 3 two ends and contact prop up 1 end is interference fits or matched in clearance, by the axial hole in the axle shape end embedding contact support 1 of rotating shaft 3, and between two mating surfaces, inject and be stained with that to connect agent bonding, thereby rotating shaft 3 is supported that 1 is connected and fixed with touching, make them obtain enough assembly precisions, and not loosening all the time under service load.
In above-mentioned various axis hole joint construction execution modes, common characteristic is, axial hole is arranged on contact and supports on 1, and an axle shape end is arranged in the rotating shaft 3.But rotating shaft 3 is supported 1 joint construction with contact, is not limited to the foregoing description, and also having a kind of execution mode is to adopt the alternative axis hole interlocking of hole axle joint construction knot, and its shape end is arranged on contact and supports on 1, and axial hole is arranged in the rotating shaft 3.The structure of the axial hole of hole axle joint construction and axle shape end can adopt any one form in above-mentioned channel shaped, annular knurl shape, polygonal, interference fit type and the adhesion type.In addition, described joint construction can adopt injection molding way to realize again, is about to axle 3 and is fixed in when the injection moulding in the plastics that contact supports as inserts.
For making rotating shaft 3 have enough rigidity, the diameter of rotating shaft 3 and length are designed to thick as far as possible and lack, and the material of rotating shaft 3 preferably adopts metal material, the plastics of perhaps adopt high strength, easily processing.
The rotating axis component of the moving contact of low-pressure plastic shell circuit breaker of the present invention because to change sliding bearing be rolling bearing, the frictional resistance of rolling bearing 4 is very little, precision is very high, so that rotating shaft 3 has high kinematic accuracy and splendid rotation flexibility.Because the rotation of rotating shaft is extremely flexible, institute so that the required operating physical force of operating mechanism reduce greatly, operate very laborsaving, the closure of dynamic and static contact/opening speed quickening, mechanism can do smaller and more exquisitely.Because the kinematic accuracy of rotating shaft 3 is very high, supports that 1 kinematic accuracy is very high so guaranteed the contact that moving contact is housed on it, thereby improved the contact performance between the dynamic and static contact greatly.Owing to accelerated the closure/opening speed between the dynamic and static contact and improved contact performance between them, so strengthened the short circuit breaking capacity of circuit breaker greatly, shortened the time of breaking arc greatly, thereby the fail safe and the reliability of circuit breaker operation mechanism work have been improved, reduced the ablative degradation of electric arc to contact, significant prolongation the useful life of low-pressure plastic shell circuit breaker.
Claims (11)
1. low-pressure plastic shell circuit breaker, have mould shell base (5) and with mould the mold insulation shell that housing-plate constitutes of moulding that the shell base matches, in described shell, be provided with the contact system and the operating mechanism thereof of executive circuit closure/opening operation, described contact system is by the fixed contact parts, moving contact part, arc control device and the arc-chute that is installed in the arc control device are formed, described moving contact part is included in operating mechanism and drives and can realize down and contact of fixed contact parts or the double-contact movable contact bridge that separates, with a rotating axis component that the moving contact part of consecutive roots is fixedlyed connected (30), it is characterized in that:
Described rotating axis component (30) comprises that at least one is used to install the contact support (1) of movable contact bridge, at least one is used to connect the consecutive roots contact and supports the rotating shaft (3) of (1), the rolling bearing (4) that at least one is used for supporting shaft (3), described rotating axis component (30) is installed in by rolling bearing (4) and moulds on the shell base (5), to improve the kinematic accuracy and the kinematic dexterity of rotating axis component (30);
Described bearing (4) is installed in the bearing pedestal (6,7) by bearing pedestal (6,7) and the bearing cover (8,9) moulded on the shell base (5), thereby rotating axis component (30) pivotally, neatly, accurately is installed to moulding in the shell base (5) of circuit breaker;
Should meet the following conditions simultaneously between the number G of the number F of the number E of described contact support (1), rotating shaft (3), rolling bearing (4) and the number of poles N of circuit breaker:
E=N; With
N-1≤F≤N+1; With
1≤G≤F。
2. circuit breaker according to claim 1 is characterized in that:
Described rotating shaft (3) is provided with a fitting surface (32), by the interior annular distance interference fit on this fitting surface (32) and the rolling bearing (4), rolling bearing (4) and rotating shaft (3) is assembled together, and guarantees that they are loosening all the time under service load;
End at the two ends of described rotating shaft (3) is provided with joint construction (31), the two ends of described contact support (1) be provided with rotating shaft (3) on the joint construction that is complementary of joint construction (31), rotating shaft (3) is connected and fixed by described joint construction that is complementary and contact support (1);
Joint construction in joint construction (31) in the rotating shaft (3) and the contact support (1) mates mutually, connects by above-mentioned coupling assembling, and rotating shaft (3), rolling bearing (4) are assembled into rotating axis component (30) with contact support (1).
3. circuit breaker according to claim 2 is characterized in that:
Described joint construction is a channel shaped axis hole joint construction;
Described channel shaped axis hole joint construction comprises: its groove that axially is provided with of lateral surface upper edge of the axle shape end at rotating shaft (3) two ends, the end face of contact support (1) along its axial hole that axially is provided with and in the medial surface upper edge of axial hole its raised line that axially is provided with;
Groove on the axle shape end of rotating shaft (3) and the raised line in the axial hole in the contact support (1) mate mutually with the relation of groove/raised line or raised line/groove;
Rotating shaft (3) is by the axial hole in its shape end embedding contact support (1), realization is connected and fixed with contact support (1), and cooperate contact force and the groove/raised line provide that the resistance shelves power that provides is provided by axis hole, make their obtain assembly precision, and loosening under service load.
4. circuit breaker according to claim 2 is characterized in that:
Described joint construction is an annular knurl oblique crank Z hole joint construction;
Described annular knurl oblique crank Z hole joint construction comprises: in the axle shape end at rotating shaft (3) two ends, at the end face of contact support (1) along its axial hole that axially is provided with and on the lateral surface of axle shape end and/or the annular knurl that is provided with on the medial surface at axial hole;
Cross sectional shape, the size of the axial hole in the cross sectional shape of the end of rotating shaft (3), size and the contact support (1) are mated mutually;
Rotating shaft (3) is by the axial hole in its shape end embedding contact support (1), realization is connected and fixed with contact support (1), and cooperate contact force and the annular knurl face provide that the frictional resistance that provides is provided by axis hole, make their obtain assembly precision, and loosening under service load.
5. circuit breaker according to claim 2 is characterized in that:
Described joint construction is a polygonal axis hole joint construction;
Described polygonal axis hole joint construction comprises: be polygonal shape end in the cross section at rotating shaft (3) two ends and be polygonal axial hole at the end face of contact support (1) along cross sectional shape that it axially is provided with;
Cross sectional shape, the size of the axial hole in cross sectional shape, size and the contact support (1) of the axle shape end of rotating shaft (3) are mated mutually;
Rotating shaft (3) is by the axial hole in its shape end embedding contact support (1), realization is connected and fixed with contact support (1), and cooperate contact force and the polygonal provide that the barrier force that provides is provided by axis hole, make their obtain assembly precision, and loosening under service load.
6. circuit breaker according to claim 2 is characterized in that:
Described joint construction is an interference fit profile shaft hole joint construction;
Described interference fit profile shaft hole joint construction comprises: the axle shape end at rotating shaft (3) two ends and at the end face of contact support (1) along its axial hole that axially is provided with;
Rotating shaft (3) is passed through its shape end with the axial hole in the form embedding contact support (1) of interference fit, being connected and fixed of realization and contact support (1), and it is not, make them obtain assembly precision, and loosening under service load by contact force and frictional resistance that the axis hole interference fit provides.
7. circuit breaker according to claim 2 is characterized in that:
Described joint construction is an adhesion type axis hole joint construction;
Described adhesion type axis hole joint construction comprises: at the axle shape end at rotating shaft (3) two ends and axial hole of its axial setting in contact support (1) end face upper edge;
Cross sectional shape, the size of cross sectional shape, size and the axial hole of described axle shape end are complementary, and be bonding with bonding agent between them;
Rotating shaft (3) embeds the axial hole in the contact support (1) and inject bonding agent between them by its shape end, realizes being adhesively fixed of rotating shaft (3) and contact support (1), makes them obtain assembly precision, and not loosening under service load.
8. according to arbitrary described circuit breaker among claim 2, the 4-7, it is characterized in that:
Described joint construction is a hole axle joint construction;
Described hole axle joint construction is included in its axial hole that axially is provided with of end face upper edge of rotating shaft (3) and holds the axle shape end that (1) end is provided with in the contact skill;
The joint construction of described axial hole and axle shape end adopts any one in described channel shaped, annular knurl shape, polygonal, interference fit type, the adhesion type;
Contact supports (1) by the axial hole in its shape end embedding rotating shaft (3), realizes the contact support
(1), and make their obtain assembly precision with being connected and fixed of rotating shaft (3), and loosening under service load.
9. according to the described circuit breaker of arbitrary claim in the claim 1 to 7, it is characterized in that: the material of described rotating shaft (3) is to guarantee its indeformable metal or high strength, plastics of easily being shaped under the situation of stand under load; The shape and size of the rotating shaft of each utmost point (3) also are unified, the shape and size of the contact support (1) of each utmost point are unified, support that to guarantee all contacts the assembling between (1) and all rotating shafts (3) is interchangeable, the circuit breaker of different numbers of poles can be adopted with a kind of rotating shaft (3), with a kind of contact support (1) with a kind of rolling bearing (4), make same production line can assemble the rotating axis component (30) of the circuit breaker of different numbers of poles.
10. circuit breaker according to claim 1 is characterized in that: described bearing cover (8,9) can be an element independently, also can be made into integration with the housing-plate of moulding of circuit breaker.
11. circuit breaker according to claim 2 is characterized in that: described joint construction can adopt injection molding way to realize again, is about to axle (3) and is fixed in when the injection moulding in the plastics that contact supports as inserts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101516031A CN101399137B (en) | 2007-09-25 | 2007-09-25 | Low-voltage plastic case breakers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101516031A CN101399137B (en) | 2007-09-25 | 2007-09-25 | Low-voltage plastic case breakers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101399137A CN101399137A (en) | 2009-04-01 |
| CN101399137B true CN101399137B (en) | 2011-06-29 |
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ID=40517595
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101516031A Active CN101399137B (en) | 2007-09-25 | 2007-09-25 | Low-voltage plastic case breakers |
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| Country | Link |
|---|---|
| CN (1) | CN101399137B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101604600B (en) * | 2009-06-05 | 2012-10-03 | 上海诺雅克电气有限公司 | Multi-stage breaker with auxiliary supports |
| DE102014204750A1 (en) | 2014-03-14 | 2015-09-17 | Siemens Aktiengesellschaft | Rotor shaft module for a rotor shaft of a molded case circuit breaker, rotor shaft for a molded case circuit breaker, molded case circuit breaker and method for producing a rotor shaft module for a rotor shaft of a molded case circuit breaker |
| CN204375671U (en) * | 2014-11-20 | 2015-06-03 | 浙江正泰电器股份有限公司 | Multi-pole double-break |
| DE102015200825B4 (en) * | 2015-01-20 | 2022-03-17 | Siemens Aktiengesellschaft | Support shaft for an electromechanical switching device and electromechanical switching device |
| US9576761B2 (en) * | 2015-05-20 | 2017-02-21 | General Electric Company | Circuit breaker crossbar assembly |
| CN105355483B (en) * | 2015-12-10 | 2018-01-26 | 二一三电器(上海)有限公司 | The phase insulation device of double breaking points change-over switch |
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| US5898146A (en) * | 1997-09-18 | 1999-04-27 | Eaton Corporation | Molded case circuit breaker with modular crossbar |
| CN1298547A (en) * | 1998-06-24 | 2001-06-06 | 施耐德电器工业公司 | Low voltage multipole circuit breaker with high electrodynamic resistance, whereof the pole shaft is arranged in the compartment housing the poles |
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| Publication number | Publication date |
|---|---|
| CN101399137A (en) | 2009-04-01 |
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Application publication date: 20090401 Assignee: Wenzhou Zhengtai Electrical Technology Co., Ltd Assignor: Zhejiang Chint Electrics Co.,Ltd. Contract record no.: X2020330000078 Denomination of invention: Low voltage moulded case circuit breaker Granted publication date: 20110629 License type: Common License Record date: 20201021 |
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