CN101170034A - Small breaker - Google Patents

Small breaker Download PDF

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Publication number
CN101170034A
CN101170034A CNA2007101903960A CN200710190396A CN101170034A CN 101170034 A CN101170034 A CN 101170034A CN A2007101903960 A CNA2007101903960 A CN A2007101903960A CN 200710190396 A CN200710190396 A CN 200710190396A CN 101170034 A CN101170034 A CN 101170034A
Authority
CN
China
Prior art keywords
contact
moving contact
tripping
rod
circuit breaker
Prior art date
Application number
CNA2007101903960A
Other languages
Chinese (zh)
Other versions
CN100555507C (en
Inventor
潘万军
王茂华
王振宇
卢为民
晏国云
Original Assignee
Tcl低压电器(无锡)有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tcl低压电器(无锡)有限公司 filed Critical Tcl低压电器(无锡)有限公司
Priority to CNB2007101903960A priority Critical patent/CN100555507C/en
Publication of CN101170034A publication Critical patent/CN101170034A/en
Application granted granted Critical
Publication of CN100555507C publication Critical patent/CN100555507C/en

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Abstract

A small-scaled breaker used in overcurrent protection and short-circuit protection includes a contact system, an arch extinguishing system, an operation mechanism, a free tripping mechanism, an overcurrent protection system and a short-circuit protection system, etc. An operation handle can actuates the operation mechanism to drive a moving contact in hinge connection to move towards a fixed contact for making circuit. In overcurrent or short circuit fault, the overcurrent protection system or the short-circuit protection system drives the free tripping mechanism to trip, with the circuit disconnected; the operation mechanism lever has an opening, which can be connected with a switchable neutral pole by a shaft, in order to realize simultaneous action of two poles. The upper end of the moving contact can realize the quick make of the moving contact by cooperating with a limiting component. A plurality of single pole small-scaled breakers can be integrated in connection by the handle, the free tripping mechanism and etc, to form the multi-pole small-scaled breaker.

Description

Miniature circuit breaker
Technical field
The present invention relates to a kind of miniature circuit breaker that is used for overcurrent protection and short-circuit protection.
Background technology
In each unit of miniature circuit breaker, contact system, arc quenching system, operating mechanism and free tripping mechanism, over-current protection system, short circuit protection system, insulation crust, operating grip etc. have been comprised.The moving contact that operating mechanism is driven in the contact system by operating grip moves, and miniature circuit breaker is connected and disjunction, realizes the control to electric wiring; By sensing, electric wiring is transshipped, implements during fault such as short circuit protection to the thermal effect and the magnetic effect of electric current.
When dynamic/static contact contact and when enough contact pressures are arranged, miniature circuit breaker is connected electric loop, and the variation of the local temperature by bimetallic element sensing miniature circuit breaker is judged and the size of current of circuit system realized excess current protective function.When loop current remains on load current value that miniature circuit breaker sets and when following, it is very little that the thermal effect that this electric current produces makes bimetallic element produce thermal deformation, can not promote free tripping mechanism and trip; When the electric current in loop surpassed the rated current of setting, the bimetallic element temperature of miniature circuit breaker raise, and can produce enough thermal deformations; the promotion free tripping mechanism is triped; moving contact is opened under the effect of spring fast, cuts off current circuit, realizes excess current protective function.
Short circuit protection system is by the variation of solenoid electromagnet sensing loop electric current, when loop current is in normal value or when the short-circuit protection value of setting is following, the electromagnetic attraction that solenoid electromagnet produces can not overcome the active force of reaction spring, and moving iron core remains on initial position under the active force of reaction spring; When current circuit is short-circuited fault; electric current sharply increases; the electromagnetic attraction that solenoid electromagnet produces overcomes the active force of reaction spring; moving iron core promotes push rod; and act on free tripping mechanism, and free tripping mechanism is triped, moving contact is opened under the effect of spring fast; cut off current circuit, realize short-circuit protection function.
The effect of free tripping mechanism is when there is the signal of overcurrent fault or other No switching on order in the loop, even the handle of operation miniature circuit breaker desires to make it to close a floodgate, the moving contact of miniature circuit breaker still remains on open position; When the loop exists overcurrent or short trouble and when sending the disjunction instruction, miniature circuit breaker threaded off, cut off current circuit.
The effect of operating mechanism is the active force that transmits operating grip, drives the moving contact motion in the contact system, realizes connecting and disjunction; To reach between dynamic/static contact and keep enough contact pressures in order to make, moving contact will have enough excess of stroke; In dynamic/static contact disconnection process,, require moving contact that enough opening speeds will be arranged in order to realize metering function; In order to make miniature circuit breaker enough dielectric strengths be arranged when the off-state, must make to have enough electric clearances between dynamic/static contact.
The effect of arc quenching system be when miniature circuit breaker when disconnecting excessive short circuit current, by effect, realize that the restriction electric current continues the trend that increases, i.e. metering function, and arc extinction the most at last to electric arc.When electric arc enters arc control device, be separated into many sections by the metal gate sheet in the arc control device, every section electric arc all produces a proximal pole voltage near the metal gate sheet, the pressure drop of whole electric arc is improved rapidly, and electric arc is extinguished rapidly.
A plurality of one pole miniature circuit breakers constitute the multipole small-size circuit breaker by operating grip, free tripping mechanism etc. is connected as one.The multipole small-size circuit breaker is realized multipole simultaneous operation by the operating grip that connects as one; When disconnecting, realize that by the reciprocal interlocking free tripping mechanism multipole small-size circuit breaker disconnects synchronously when producing fault at least one minimal type circuit breaker.
In traditional miniature circuit breaker, even operating mechanism and free tripping mechanism mechanically still connect together behind trip free, when short circuit breaking, time has only tens microseconds, the mechanism that connects together may influence the break-time of mechanism, even have only the influence of several microseconds, also be very large to effect of arc, this influence is should be not uncared-for.
In addition, in the arc quenching system of traditional miniature circuit breaker, when the disjunction short circuit current, electric arc is before entering arc control device, finish from shifting between guide arc plate and the arc leading angle between dynamic/static contact, and through leading the arc road between arc plate and the arc leading angle, just can enter arc control device, in this process, the arc root of electric arc is transferred to the moment of leading the arc plate from moving contact, and sudden change has taken place in the loop that produces the magnetic blow-out effect, and the magnetic blow-out effect in loop to the electric power of electric arc a sudden change can take place also, the electric power of magnetic blow-out effect has weakened, and electric arc enters arc control device and becomes more difficult through leading arc road between arc plate and the arc leading angle.
Molded insulation crust is still installed the support of various parts except the basic insulation that miniature circuit breaker is provided, therefore, molded insulation crust must have enough electrical strengths and mechanical strength, could satisfy the performance requirement of miniature circuit breaker.
Summary of the invention
The objective of the invention is to design a kind of dependable performance, miniature circuit breaker that breaking capacity is high.
According to design provided by the present invention, the contact system that comprises moving contact, fixed contact is installed in plastic casing;
And arc quenching system: comprise being used to install the contact support of fixed contact and being positioned at contact and support the bottom-right arc plate of leading; And, the contact support with lead the arc plate be positioned at before and after the cavity that surrounds of arc sheet, in contact support and the left side of leading the arc plate arc control device are arranged;
Operating system and free tripping mechanism: comprise handle, the connecting rod with handle is hinged reaches tripping part and lever;
It is characterized in that, the middle part of tripping part and the middle part of lever are rotationally connected with on the main shaft, left side, upper end at lever is provided with end face, the right-hand member of connecting rod directly acts on the end face of lever, torsion spring is arranged on main shaft, the tripping part near this end face, is provided with a locating surface that the right-hand member of connecting rod can be positioned between lever and the tripping part on the right side, upper end of tripping part under the effect of torsion spring; The middle part of moving contact utilizes bearing pin to be articulated in the lower end of lever, on the moving contact, bearing pin above and between the right side of shell spring is arranged.
End face and connecting rod are angled, and when moving contact and fixed contact were closed, if connecting rod is not subjected to the effect of tripping part, the right-hand member of connecting rod can slide along end face, and skids off end face.When the locating surface of tripping part pinned the right-hand member of connecting rod, connecting rod can not slide along end face.The plane is arranged on handle, and this plane is positioned at the right side of the pin joint of connecting rod and handle, and behind connecting rod and tripping part trip free, connecting rod resets under the effect on this plane.
Position in the left side of moving contact corresponding to main shaft is provided with stop surface, and when moving contact and fixed contact were in open position, the stop surface of moving contact leaned against on the main shaft, the moving contact of moving contact lower end under the effect of spring away from fixed contact.Upper end at lever is provided with through hole, but for the 1PN type miniature circuit breaker of the neutral pole N (not shown) that has the disjunction contact, after the neutral pole N that can cut-off utilizes the pin that is through in the through hole and lever hinged, can realize the synchronization action of two neutral pole N.
In the enclosure, the upper right side of moving contact is provided with the slide block that can slide up and down, in the closing course of moving contact and fixed contact, the upper end of moving contact on the left surface of this slide block to lower slider, slide down to when breaking away from slide block in the upper end of moving contact, moving contact and fixed contact are quick-make.In the contact support arc leading angle is set, a minimum range point is set leading between arc plate and the arc leading angle, this minimum range point is positioned at the middle part of leading the arc plate, and the minimum range of this minimum range point equals or approach the distance of opening of moving contact and fixed contact.
Over-current protection system also is installed in the enclosure: comprise being positioned at the bimetallic element and the pull bar of leading arc plate right side; And short circuit protection system: comprise the electromagnet that is positioned at tripping part left side.
Advantage of the present invention is: dependable performance, breaking capacity is strong.
Description of drawings
Fig. 1 is the open position state of miniature circuit breaker.
Fig. 2 is the on-position state of miniature circuit breaker.
Fig. 3 is when fast closing mechanism is housed, the state before fast closing mechanism discharges.
Fig. 4 is when fast closing mechanism is housed, the state after fast closing mechanism discharges.
Embodiment
For removing the miniature circuit breaker of lid, the contact system of being made up of moving contact 11, fixed contact 10 is installed in plastic casing 1 as shown in Figure 1 and Figure 2; By contact support 15, lead the arc quenching system that arc plate 14, arc sheet 16 and arc control device 17 constitute; Operating system that constitutes by handle 5, connecting rod 4, lever 3, tripping part 6, spring 9 and free tripping mechanism, the over-current protection system that constitutes by bimetallic element 13 and pull bar 12; The short circuit protection system that electromagnet 2 constitutes.
Miniature circuit breaker as shown in Figure 1 and Figure 2, conductive components such as the coil of last lug plate, electromagnet 2, contact support 15, fixed contact 10 are with spot-welded on together; The static iron core of electromagnet 2, yoke and contact support 15 rivet together; Moving contact 11, the line that is flexible coupling, bimetallic element 13, connecting plate, lead arc plate 14, down conductive parts such as lug plate are with spot-welded on together; Moving contact 11 rivets together with tripping part 6 usefulness tubular rivets with lever 3, lever 3, and is free to rotate each other behind the riveted; The main shaft 7 of lever 3 is fixed on the shell 1; Other parts assemble as shown in the figure.
In operating mechanism and free tripping mechanism, connecting rod 4 directly acts on the end face 3 ' of lever 3, tripping part 6 is close this end face 3 ' under the effect of torsion spring 19, there is a locating surface 6 ' can pin connecting rod 4 on the tripping part 6, connecting rod 4 is positioned between lever 3 and the tripping part 6, if connecting rod 4 is not subjected to the effect of tripping part 6 or says that tripping part 6 pushed aside by external force, then connecting rod 4 can slide along end face 3 ' when closed, and can skid off this end face 3 ', promptly realize the trip free of mechanism; Tripping part 6 and lever 3 are got back to open position around same main shaft 7 rotations under the effect of spring 9; Behind trip free, connecting rod 4 can be under the pressure on the plane 5 ' on the handle 5 resets and resets smoothly with the rotation of handle 5.
In addition, a through hole 3 is arranged on the lever 3 ", can pass this through hole 3 by an axle " can cut-off neutral pole and link to each other with one, realize the two poles of the earth synchronization action.
The main shaft 7 that lever 3 is installed was grown in the upper end 11 ' of moving contact 11, and can act on a slide block 18, realized the quick-make of moving contact 11 and fixed contact 10.In the starting stage of closure, moving contact 11 is around main shaft 7 and bearing pin 8 motions, and the upper end 11 ' of moving contact 11 moves along a straight line under the stopping of slide block 18 up to position shown in Figure 3, when moving contact 11 travels forward again, the upper end 11 ' of moving contact 11 is just discharged by slide block 18 and rotates around bearing pin 8 rapidly, moving contact 11 is connected rapidly with fixed contact 10, as shown in Figure 4, realizes the quick-make of moving contact 11 and fixed contact 10.
Moving contact 11 and lever 3 are articulated in bearing pin 8, and moving contact 11 can be around bearing pin 8 rotations, and when miniature circuit breaker was in open position, moving contact 11 had a stop surface to lean against on the main shaft 7, and moving contact 11 is parked in open position under the effect of spring 9.
Operating grip 5 is when on-position (being the position of moving contact 11 and fixed contact 10 closures) motion (position shown in Figure 2), moving contact 11 begins to rotate around axle 7, when moving contact 11 moves to when contacting with fixed contact 10, moving contact 11 just can not travel forward with the contact-making surface of fixed contact 10 again, this moment is when handle 5 travels forward again, moving contact 11 just begins to rotate around bearing pin 8, the stop surface that moving contact 11 contacts with main shaft 7 just leaves main shaft 7, and the contact pressure of 10 of moving contact 11 and fixed contacts is increased suddenly; Handle 5 travels forward until closure again, and the contact pressure that moving contact 11 and fixed contact are 10 will continue to increase, and until the contact pressure that satisfies design, and the stroke of this section moving contact 11 is exactly the excess of stroke.
Contact support 15 is provided with arc leading angle 15 ', a minimum range point 14 ' is set leading between arc plate 14 and the arc leading angle 15 ', this minimum range point 14 ' is positioned at the middle part of leading arc plate 14, and the minimum range that this minimum range point 14 ' is located equals or approaches the distance of opening between moving contact 11 and the fixed contact 10.When the disjunction short circuit current, electric arc is transferred to the moment of leading arc plate 14 from moving contact 11, under the situation that the electric power of magnetic blow-out effect weakens suddenly, because the existence of this minimum range, electric arc can move to this minimum range point rapidly, the magnetic blow-out effect is strengthened once more, make electric arc enter arc control device 17 smoothly fast; After electric arc enters arc control device 17, be separated into many sections by the metal gate sheet in the arc control device 17, every section electric arc all produces a proximal pole voltage near the metal gate sheet, the pressure drop of whole electric arc is improved rapidly, and electric arc is extinguished rapidly; The quick transfer of electric arc and extinguish and guaranteed that the actual short electric current is far smaller than prospective short circuit current can well realize metering function; In the spray arc road of arc control device 17 back, a de-ionizing grid is arranged, can absorb the high-temperature ionized gas that electric arc produces, avoid ionized gas in miniature circuit breaker, to spray.
In over-current protection system; continue the time of a fixed length when overcurrent after; bimetallic element 13 will produce the bent distortion of enough changes; and pulling pull bar 12 moves right; 12 pullings of pull bar tripping part 6; tripping part 6 discharges connecting rod 4 after rotating counterclockwise certain angle, the miniature circuit breaker trip free, thus realize excess current protective function.
In short circuit protection system; electric current increases rapidly when producing short trouble in the loop; produce suction between the sound iron core in electromagnet 2 greater than the active force of reaction spring; iron core is travelled forward promote push rod tripping part 6 is rotated; the miniature circuit breaker trip free, thus realize short-circuit protection function.
Shell 1 and lid (not shown) constitute the insulation crust of miniature circuit breaker among Fig. 1 and Fig. 2, molded insulation crust is except the basic insulation that miniature circuit breaker is provided, the support of various parts still is installed, have enough electrical strengths and mechanical strength, satisfy the performance requirement of miniature circuit breaker.
A plurality of one pole miniature circuit breakers constitute the multipole small-size circuit breaker by operating grip 5, free tripping mechanism etc. are connected as one.The multipole small-size circuit breaker is realized multipole simultaneous operation by the operating grip 5 that connects as one; When disconnecting, realize that by the free tripping mechanism of phase interconnected lock the multipole small-size circuit breaker disconnects synchronously when producing fault at least one minimal type circuit breaker.

Claims (9)

1. a miniature circuit breaker is equipped with the contact system that comprises moving contact (11), fixed contact (10) in plastic casing;
And arc quenching system: comprise being used to install the contact support (15) of fixed contact (10) and being positioned at the bottom-right arc plate (14) of leading of contact support (15); And, contact support (15) with lead arc plate (14) be positioned at before and after the cavity that surrounds of arc sheets (16), in contact support (15) and the left side of leading arc plate (14) arc control device (17) are arranged;
Operating system and free tripping mechanism: comprise handle (5), the connecting rod (4) with handle (5) is hinged reaches tripping part (6) and lever (3);
It is characterized in that, the middle part of the middle part of tripping part (6) and lever (3) is rotationally connected with on the main shaft (7), left side, upper end at lever (3) is provided with end face (3 '), the right-hand member of connecting rod (4) directly acts on the end face (3 ') of lever (3), torsion spring (19) is arranged on main shaft (7), tripping part (6) near this end face (3 '), is provided with a locating surface (6 ') that the right-hand member of connecting rod (4) can be positioned between lever (3) and the tripping part (6) on the right side, upper end of tripping part (6) under the effect of torsion spring (19); The middle part of moving contact (11) utilizes bearing pin (8) to be articulated in the lower end of lever (3), goes up at moving contact (11), spring (9) is arranged between the right side of the top of bearing pin (8) and shell.
2. miniature circuit breaker as claimed in claim 1, it is characterized in that: end face (3 ') is angled with connecting rod (4), when moving contact (11) and fixed contact (10) are closed, if connecting rod (4) is not subjected to the effect of tripping part (6), the right-hand member of connecting rod (4) can slide along end face (3 '), and skids off end face (3 ').
3. miniature circuit breaker as claimed in claim 1 is characterized in that: the locating surface (6) in tripping part (6) ' when pinning the right-hand member of connecting rod (4), connecting rod (4) can not slide along end face (3 ').
4. miniature circuit breaker as claimed in claim 1, it is characterized in that: on handle (5), plane (5 ') is arranged, this plane (5 ') is positioned at the right side of the pin joint of connecting rod (4) and handle (5), behind connecting rod (4) and tripping part (6) trip free, connecting rod (4) resets under the effect on this plane (5 ').
5. miniature circuit breaker as claimed in claim 1, it is characterized in that: corresponding to the position of main shaft (7) stop surface (11 ") is set; when moving contact (11) and fixed contact (10) when being in open position; the stop surface of moving contact (11) (11 ") leans against on the main shaft (7) in the left side of moving contact (11), the moving contact of moving contact (11) lower end under the effect of spring (9) away from fixed contact.
6. as claim 1 and 2 described miniature circuit breakers, it is characterized in that: through hole (3 ") is set in the upper end of lever (3), and pin and lever (3) that the neutral pole utilization that can cut-off is through in the through hole (3 ") are hinged, the synchronization action of two neutral poles of realization.
7. miniature circuit breaker as claimed in claim 1, it is characterized in that: in the enclosure, the upper right side of moving contact (11) is provided with the slide block (18) that can slide up and down, in the closing course of moving contact (11) and fixed contact (10), the upper end (11 ') of moving contact (11) on the left surface of this slide block (18) to lower slider, slide down to when breaking away from slide block (18) in the upper end (11 ') of moving contact (11), moving contact (11) is quick-make with fixed contact (10).
8. miniature circuit breaker as claimed in claim 1, it is characterized in that: in contact support (15), arc leading angle (15 ') is set, a minimum range point (14 ') is set leading between arc plate (14) and the arc leading angle (15 '), this minimum range point (14 ') is positioned at the middle part of leading arc plate (14), and the minimum range of this minimum range point (14 ') equals or approach the distance of opening of moving contact (11) and fixed contact (10).
9. miniature circuit breaker as claimed in claim 1 is characterized in that: over-current protection system also is installed in the enclosure: comprise being positioned at the bimetallic element (13) and the pull bar (12) of leading arc plate (14) right side;
And short circuit protection system: comprise the electromagnet (2) that is positioned at tripping part (6) left side.
CNB2007101903960A 2007-11-27 2007-11-27 Miniature circuit breaker CN100555507C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2007101903960A CN100555507C (en) 2007-11-27 2007-11-27 Miniature circuit breaker

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2007101903960A CN100555507C (en) 2007-11-27 2007-11-27 Miniature circuit breaker

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Publication Number Publication Date
CN101170034A true CN101170034A (en) 2008-04-30
CN100555507C CN100555507C (en) 2009-10-28

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102368461A (en) * 2011-09-13 2012-03-07 上海诺雅克电气有限公司 Miniature circuit breaker
CN102427002A (en) * 2011-11-24 2012-04-25 天津市百利电气有限公司 Molded case circuit breaker for realizing brake separation at different distances
CN103337425A (en) * 2013-05-28 2013-10-02 宁波市镇海怡福莱文化创意有限公司 Electromagnetic direct-drive protector
CN103500692A (en) * 2013-09-30 2014-01-08 长城电器集团有限公司 Arc extinguishing device of circuit breaker
CN104319203A (en) * 2014-11-13 2015-01-28 杭州泰姆电气有限公司 Breaker operation mechanism
CN105070609A (en) * 2015-08-05 2015-11-18 浙江凯发电气股份有限公司 Novel prepaid miniature circuit breaker

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102368461A (en) * 2011-09-13 2012-03-07 上海诺雅克电气有限公司 Miniature circuit breaker
CN102427002A (en) * 2011-11-24 2012-04-25 天津市百利电气有限公司 Molded case circuit breaker for realizing brake separation at different distances
CN103337425A (en) * 2013-05-28 2013-10-02 宁波市镇海怡福莱文化创意有限公司 Electromagnetic direct-drive protector
CN103500692A (en) * 2013-09-30 2014-01-08 长城电器集团有限公司 Arc extinguishing device of circuit breaker
CN104319203A (en) * 2014-11-13 2015-01-28 杭州泰姆电气有限公司 Breaker operation mechanism
CN104319203B (en) * 2014-11-13 2017-08-25 杭州泰姆电气有限公司 Circuit breaker operation mechanism
CN105070609A (en) * 2015-08-05 2015-11-18 浙江凯发电气股份有限公司 Novel prepaid miniature circuit breaker

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Owner name: WUXI TCL LEGRAND LOW VOLTAGE ELECTRICAL APPLIANCES

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CP01 Change in the name or title of a patent holder

Address after: 214028 Jiangsu Wuxi New District Wang Zhuang Industrial Park (zone 1)

Patentee after: Wuxi TCL-Legrand Low Voltage Electrical Co, Ltd.

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Patentee before: TCL Low-Voltage Electric(Wuxi) Co., Ltd.

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Owner name: LEGRAND LOW-VOLTAGE ELECTRIC (WUXI) CO., LTD.

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Address after: 214028 B15, national hi tech Industrial Development Zone, New District, Jiangsu, Wuxi

Patentee after: LEGRAND LOW-VOLTAGE ELECTRICAL (WUXI) CO., LTD.

Address before: 214028 Jiangsu Wuxi New District Wang Zhuang Industrial Park (zone 1)

Patentee before: Wuxi TCL-Legrand Low Voltage Electrical Co, Ltd.

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Granted publication date: 20091028

Termination date: 20131127