CN106128883A - A kind of double-breakpoint contact system for low-voltage circuit breaker - Google Patents
A kind of double-breakpoint contact system for low-voltage circuit breaker Download PDFInfo
- Publication number
- CN106128883A CN106128883A CN201610643915.3A CN201610643915A CN106128883A CN 106128883 A CN106128883 A CN 106128883A CN 201610643915 A CN201610643915 A CN 201610643915A CN 106128883 A CN106128883 A CN 106128883A
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- Prior art keywords
- touch spring
- circuit breaker
- voltage circuit
- low
- contact
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- 230000005520 electrodynamics Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 239000004020 conductor Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 235000003332 Ilex aquifolium Nutrition 0.000 description 1
- 241000209027 Ilex aquifolium Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- UYKQQBUWKSHMIM-UHFFFAOYSA-N silver tungsten Chemical compound [Ag][W][W] UYKQQBUWKSHMIM-UHFFFAOYSA-N 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- 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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- Breakers (AREA)
Abstract
The invention discloses a kind of double-breakpoint contact system for low-voltage circuit breaker, belong to low-voltage circuit breaker technical field.The present invention is provided with touch spring axle and corresponding touch spring at the two ends of the moving conductive bridge of low-voltage circuit breaker, one end of touch spring hangs on touch spring axle, the other end hangs on support, each touch spring axle both sides are respectively arranged with a spring axle sleeve, making spring axle sleeve keep tangent contact with bracket edge all the time by the stretching of touch spring, when moving conductive bridge rotates, the stop by the middle cover of low-voltage circuit breaker is spacing.The present invention can effectively ensure that moving contact occurs without and again falls.
Description
Technical field
The invention belongs to low-voltage circuit breaker technical field, relate generally to a kind of double break contact system for low-voltage circuit breaker
System.
Background technology
At present, in the contact system of existing low-voltage circuit breaker, the end pressure of contact system is generally individually against touch spring
Being given, so requirement to touch spring is the highest, especially proposes at intensity, fatigue life, the aspect such as high temperature resistant to material
The highest requirement.On the other hand, when short circuit occur, after short circuit current arrives, low-voltage circuit breaker first will against electrodynamic repulsion force
Moving conductive bridge is scolded out.Being absolutely not to allow moving contact again to fall after scolding out, when moving contact is as again fallen, chopper is the most disconnected not
Open, cause burning of load end equipment.Ensure that moving contact occurs without again fall it is thus desirable to arrange corresponding mechanism.But it is existing
Some moving contact electric power scold opening mechanism, and many structures are complicated, assembling difficulty, and when electrodynamic repulsion force disappears, moving contact may be again
Return to original make position, thus cause potential safety hazard.
Chinese patent document CN 201898106 U proposes a kind of movable contact terminal system for single-breakpoint circuit breaker, this technical scheme
It is: movable contact terminal system for single-breakpoint circuit breaker includes moving contact, axle, roller, supporter, spring and rotating shaft.One end of moving contact leads to
Crossing rotating shaft to fix with supporter, the other end of roller and moving contact is chained together by axle.Spring one end is fixed on supporter,
The other end hangs over the jag of axle.Roller is strained by spring, makes roller slide on the work surface of supporter.Supporter work surface
Upper end be provided with circular arc, time at roller-coaster to circular arc, be stuck in circular arc.In the rear end of supporter, the opposite side of circular arc
It is provided with triangle bayonet socket.When moving contact is at logical super-high-current by the effect of electrodynamic repulsion force after can be separated into cut-offfing of contact
Position, and can be parked at the circular arc of moving contact supporter motionless, it is to avoid when electrodynamic repulsion force disappears, moving contact is returned to former
The make position come.The triangle bayonet socket of moving contact supporter is used as spacing, prevents this part from rotating excess.Therefore, above-mentioned
Technical scheme can dissolve the problem that moving contact falls again to a certain extent.
But, technique scheme there is also two major issues: the first, the upper end arc structure of supporter work surface
Design certainly will increase the difficulty of processing and the requirement of technique, just in case machining accuracy is inadequate, is difficult to block moving contact；The second,
Chopper uses for a long time and work surface will certainly be made to wear and tear, and may wear to certain degree and can not be blocked by contact, thus
Cause the hidden danger that secondary falls.Meanwhile, this structure to carry out the special spacing design of triangle bayonet socket on support, adds
The difficulty of processing and the requirement of technique.And the end pressure of contact system still provides against touch spring in this technical scheme,
The problem high to touch spring requirement cannot be solved.
Summary of the invention
The present invention seeks to: again fall to be further ensured that moving contact occurs without, reduce the difficulty to processing and work
The requirement of skill, changes the presentation mode of the end pressure of contact system, it is provided that a kind of double break contact system for low-voltage circuit breaker
System.
Specifically, the present invention realizes by the following technical solutions: a kind of double break for low-voltage circuit breaker taps
Head system, including the first quiet conducting bridge, the second quiet conducting bridge, support, central shaft and the moving conductive bridge around central axis,
Frame is connected with central shaft and rotates with central shaft, and the first quiet conducting bridge and the second quiet conducting bridge are respectively arranged with stationary contact
Point, moving conductive bridge is located in support, and its two ends pass support, and are being respectively arranged at two ends with lead quiet with the first quiet conducting bridge and second
The movable contact that stationary contact on electric bridge matches, is additionally provided with touch spring axle and corresponding contact bullet at the two ends of moving conductive bridge
Spring, one end of touch spring hangs on touch spring axle, the other end hangs on support, and each touch spring axle both sides are respectively arranged with one
Spring axle sleeve, makes spring axle sleeve keep tangent contact with bracket edge all the time by the stretching of touch spring, and moving conductive bridge turns
Time dynamic, the stop by the middle cover of low-voltage circuit breaker is spacing.
The principle of technique scheme is: when low-voltage circuit breaker closes a floodgate, and support passes through touch spring axle sleeve and contact bullet
By moving conductive bridge downwards " pressure ", when movable contact contacts with stationary contact, support and central shaft are rotated further the generation excess of stroke to spring axle, from
And produce end pressure.When there being short circuit current to arrive, rapidly moving conductive bridge is scolded out by electrodynamic repulsion force.Due to touch spring
Being constantly in extended state so that touch spring axle sleeve keeps tangent contact with bracket edge all the time, the pulling force of such spring begins
Point to normal direction eventually, there is no tangential force, so moving conductive bridge will not fall again, it is ensured that load equipment and the safety of the person, from
And without arranging the structure blocking moving conductive bridge on support.After moving conductive bridge is scolded out by electrodynamic repulsion force, directly broken by low
The stop of the middle cover of road device carries out spacing, is also no longer necessary to design special position limiting structure on support.
In technique scheme, described support includes that upper bracket and lower carriage, upper bracket and lower carriage rivet with central shaft.
In technique scheme, described moving conductive bridge be respectively arranged at two ends with slotted hole, touch spring axle is positioned at accordingly
In slotted hole.
Beneficial effects of the present invention is as follows: compared with prior art, on the one hand, the present invention changes the final pressure of contact system
The source of power, is rotated by the excess of stroke of support and central shaft and produces end pressure, thus reduce the high request to touch spring, by
Very big in end pressure, the bulk temperature rising of chopper is the lowest, improves the performance of chopper itself.On the other hand, the present invention touches
Head axle sleeve is tangent with support all the time, and the pulling force of spring points to normal direction all the time, without tangential force, it is ensured that moving conductive bridge will not fall；
The present invention is spacing to moving conductive bridge against middle cover, it is not necessary to carries out special spacing design on support, reduces the difficulty of processing
Requirement with technique.
Accompanying drawing explanation
Fig. 1 is the side view of the contact system of the present invention；
Fig. 2 is the contact system front view of the present invention；
Fig. 3 is the upper bracket front view of the present invention；
Fig. 4 is the lower carriage front view of the present invention；
Fig. 5 is the schematic diagram that the moving conductive bridge of the present invention is scolded out by electrodynamic repulsion force；
Fig. 6 is the schematic diagram of the moving conductive bridge reset of the present invention；
Fig. 7 is the schematic diagram of the moving conductive bridge of the present invention；
Label in figure: 1 first quiet conducting bridge 1,2 stationary contact, 3 movable contacts, 4 moving conductive bridges,
5 touch spring axles, 6 touch spring axle sleeves, 7 touch springs, 8 upper brackets, 9 central shafts,
10 second quiet conducting bridges, 11 lower carriages, the middle cover of 12 low-voltage circuit breakers.
Detailed description of the invention
Below in conjunction with embodiment and referring to the drawings the present invention is described in further detail.
Embodiment 1:
One embodiment of the present of invention, mainly by the first quiet conducting bridge 1 and the second quiet conducting bridge 10, stationary contact 2, movable contact
3, moving conductive bridge 4, touch spring axle 5, touch spring axle sleeve 6, touch spring 7, upper bracket 8, central shaft 9, lower carriage 11, low pressure
The middle cover 12 of chopper forms, as depicted in figs. 1 and 2.
Stationary contact 2 is separately positioned on the first quiet conducting bridge 1 and the second quiet conducting bridge 10.Upper bracket 8 and lower carriage 11 are used
Riveted gets up with central shaft 9 riveting, and rotates together with central shaft 9.Moving conductive bridge 4 is located in upper bracket 8 and lower carriage 11,
Rotating around central shaft 9, its two ends pass upper bracket 8 and lower carriage 11, and are respectively equipped with the movable contact matched with stationary contact 2
3。
Touch spring axle 5 and touch spring axle sleeve 6 are arranged on moving conductive bridge 4.As it is shown in fig. 7, the two ends of moving conductive bridge 4
It is respectively equipped with slotted hole (at the A of Fig. 7 and at B).Touch spring axle 5 is in slotted hole slide inside.Piece touch spring axle 5 both sides
Being respectively arranged with a spring axle sleeve 6, touch spring 7 one end hangs on touch spring axle 5, and one end hangs over upper bracket 8 or lower carriage 11
On.The touch spring of upper bracket 8 or lower carriage 11 both sides is full symmetric.No matter it is in which kind of duty, touch spring 7 one
Straight for extended state, thus ensure that spring axle sleeve 6 keeps tangent contact with the edge of upper bracket 8 or lower carriage 11 all the time,
The pulling force so making spring points to normal direction all the time, does not has tangential force.The edge of upper bracket 8 and lower carriage 11 and spring axle sleeve 6
Tangent inter_curve is distinguished the most as shown in Figure 3 and Figure 4, two complete centrosymmetry of curve.
When low-voltage circuit breaker closes a floodgate, upper bracket 8 and lower carriage 11 will by touch spring axle sleeve 6 and touch spring axle 5
Moving conductive bridge 4 downward " pressure ", when movable contact 3 contacts with stationary contact 2, upper bracket 8 and lower carriage 11 and central shaft 9 are rotated further
Produce the excess of stroke, thus produce end pressure.
When there being short circuit current to arrive, rapidly moving conductive bridge 4 is scolded out by electrodynamic repulsion force.After scolding out, as it was previously stated,
Owing to the elastic force of touch spring 7 always points to normal direction, tangentially there is no component, so moving conductive bridge 4 will not fall again, thus
Can determine ensure that the safety of load equipment and the person.
After moving conductive bridge 4 is scolded out by electrodynamic repulsion force, the stop by the middle cover 12 of chopper carries out spacing, as shown in Figure 5.Cause
This, it is not necessary on support, design special position limiting structure.When mechanism trips, moving conductive bridge 4 resets, as shown in Figure 6.
The technique effect of the present embodiment is described below by way of simulation calculation:
Low-voltage circuit breaker is from energy storage position making process, and movable contact 3 does not has pressure when just contacting with stationary contact 2.
When upper bracket 8 and lower carriage 11 pass through spring axle sleeve 6 and touch spring axle 5 by moving conductive bridge 4 downward " pressure ", just create super
Journey, therefore just creates end pressure between movable contact 3 and stationary contact 2.In order to verify its effect, can be inside three-dimensional software UG
Set up the threedimensional model of system, import to inside ADAMS, definition material, restriction relation, contact relation inside ADAMS,
Create spring, loaded load inside ADAMS, carry out simulation calculation.Result of calculation shows, when the excess of stroke is 2.5mm, end pressure can
Reach 80N.
When low-voltage circuit breaker normally uses process, when running into overload or short circuit current, only by the automatically jumping of mechanism
Having little time, at this time, it may be necessary to moving conductive bridge is scolded out by electrodynamic repulsion force by electromagnetism generation rapidly, electrodynamic repulsion force mainly has suddenly
Nurse power FH(Holm force) and Lorentz force FL(Lorentz force) the two part forms, and Huo Muli is to be touched by dynamic and static
The head electric current linear shrinkage that causes of contact point causes, Lorentz force then due to moving conductive bridge and quiet conducting bridge by overload (or
Person's short circuit) interacting after electric current produces.Wherein, nurse power F suddenlyHComputing formula be:
In formula:
μ0Permeability of vacuum；
I flows through the electric current (A) of shrinking zone conductor；
ξ is with the relevant coefficient of contact surface contact condition, and its scope is between 0.3-0.6；
Brinell hardness (the N/mm of H material2)；
FkContact force (N)；
The section radius of B contact conductor.
If for silver tungsten materials A gW (50), the desirable 900N/mm of H in formula2, ξ takes 0.45.So, when there being 20000A to arrive
Time, the Huo Muli of generation is about 150N.
If conduction current density is J in conductor, magnetic flux density vector is B, and the volume of current－carrying conductor is V, then act on
Total Lorentz force F on conductorLFor:
FL=∫VJ×BdV (2)
Calculating through ANSYS and ADAMS associative simulation, result shows meeting excess of stroke 2.5mm and the premise of end pressure 80N
Under, electrodynamic repulsion force can be scolded open contact within the 0.0015s time, and will not again fall, and stroke is 23.68mm, it is ensured that
The safety of equipment.
Although the present invention is open as above with preferred embodiment, but embodiment is not for limiting the present invention's.Not
Depart from the spirit and scope of the present invention, any equivalence change done or retouching, also belong to the protection domain of the present invention.Cause
The content that this protection scope of the present invention should be defined with claims hereof is as standard.
Claims (3)
1. for a double-breakpoint contact system for low-voltage circuit breaker, including the first quiet conducting bridge (1), the second quiet conducting bridge
(10), support, central shaft (9) and the moving conductive bridge (4) rotated around central shaft (9), support and central shaft (9) be connected and with in
Mandrel (9) rotates together, and the first quiet conducting bridge (1) and the second quiet conducting bridge (10) are respectively arranged with stationary contact (2), moving conductive
Bridge (4) is located in support, and its two ends pass support, and are being respectively arranged at two ends with and the first quiet conducting bridge (1) and the second quiet conduction
The movable contact (3) that stationary contact (2) on bridge (10) matches, it is characterised in that:
Touch spring axle (5) and corresponding touch spring (7), the one of touch spring (7) it is additionally provided with at the two ends of moving conductive bridge (4)
End hangs on touch spring axle (5), the other end hangs on support, and each touch spring axle (5) both sides are respectively arranged with a spring axle sleeve
(6), spring axle sleeve (6) is made to keep tangent contact, moving conductive bridge with bracket edge all the time by the stretching of touch spring (7)
(4) spacing by the stop of the middle cover (12) of low-voltage circuit breaker during rotation.
Double-breakpoint contact system for low-voltage circuit breaker the most according to claim 1, it is characterised in that: described support bag
Include upper bracket (8) and lower carriage (11), upper bracket (8) and lower carriage (11) to rivet with central shaft (9).
Double-breakpoint contact system for low-voltage circuit breaker the most according to claim 1 and 2, it is characterised in that: described dynamic
Conducting bridge (4) be respectively arranged at two ends with slotted hole, touch spring axle (5) is positioned at corresponding slotted hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610643915.3A CN106128883B (en) | 2016-08-08 | 2016-08-08 | A kind of double-breakpoint contact system for low-voltage circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610643915.3A CN106128883B (en) | 2016-08-08 | 2016-08-08 | A kind of double-breakpoint contact system for low-voltage circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106128883A true CN106128883A (en) | 2016-11-16 |
| CN106128883B CN106128883B (en) | 2019-11-05 |
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ID=57257409
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610643915.3A Expired - Fee Related CN106128883B (en) | 2016-08-08 | 2016-08-08 | A kind of double-breakpoint contact system for low-voltage circuit breaker |
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| Country | Link |
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| CN (1) | CN106128883B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023416A (en) * | 1989-10-03 | 1991-06-11 | Fuji Electric Co., Ltd. | Circuit breaker |
| CN101707170A (en) * | 2008-08-20 | 2010-05-12 | 西门子公司 | Circuit breaker, in particular for low voltages |
| CN203026469U (en) * | 2012-12-05 | 2013-06-26 | 上海电器股份有限公司人民电器厂 | Moving contact component of moulded case circuit breaker |
| CN105551840A (en) * | 2016-02-03 | 2016-05-04 | 首瑞（天津）电气设备有限公司 | Contact rotation shaft system and low-voltage switch |
| CN205920944U (en) * | 2016-08-08 | 2017-02-01 | 张文红 | A double break point contact system for low -voltage circuit breaker |
-
2016
- 2016-08-08 CN CN201610643915.3A patent/CN106128883B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5023416A (en) * | 1989-10-03 | 1991-06-11 | Fuji Electric Co., Ltd. | Circuit breaker |
| CN101707170A (en) * | 2008-08-20 | 2010-05-12 | 西门子公司 | Circuit breaker, in particular for low voltages |
| CN203026469U (en) * | 2012-12-05 | 2013-06-26 | 上海电器股份有限公司人民电器厂 | Moving contact component of moulded case circuit breaker |
| CN105551840A (en) * | 2016-02-03 | 2016-05-04 | 首瑞（天津）电气设备有限公司 | Contact rotation shaft system and low-voltage switch |
| CN205920944U (en) * | 2016-08-08 | 2017-02-01 | 张文红 | A double break point contact system for low -voltage circuit breaker |
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| Publication number | Publication date |
|---|---|
| CN106128883B (en) | 2019-11-05 |
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Granted publication date: 20191105 |
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