CN101145475A - Moulded case type circuit breaker instant tripping device - Google Patents
Moulded case type circuit breaker instant tripping device Download PDFInfo
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Abstract
An instantaneous trip mechanism used in a tripping mechanism of a molded case circuit breaker is provided, which can easily regulate the sensitivity of tripping current for actuating the instantaneous trip operation and can provide a constant sensitivity of tripping current by using a control unit with simple structure and a product and produce molded case circuit breakers with reliable performance. The instantaneous trip mechanism for molded case circuit breakers comprises a fixed electromagnet for producing a magnetic force which can change along with the current flowing through the circuit; an armature being equipped oppositely to the fixed electromagnet and adapted to rotate to the tripping position of the molded case circuit breaker under the magnetic action of the fixed electromagnet when a current higher than the normal current flows thought the circuit; a spring for elastically biasing the armature in the direction apart from the fixed electromagnet; a dial regulating member with a cam surface for regulating the space between the armature and the fixed electromagnet; and a regulating rod with one end in contact with the cam surface of the dial regulating member and the other end in contact with the armature and adapted to rotate to push the armature to change the space according to the position contacting with the cam surface of the dial regulating member.
Description
Technical field
The present invention relates to a kind of molded case circuit breakers, and be specifically related to a kind of moment tripping mechanism of molded case circuit breakers, it can utilize simple mechanism to regulate the tripping current susceptibility, and can according to product produce provide constant tripping current susceptibility, molded case circuit breakers reliably.
Background technology
Usually, molded case circuit breakers is represented a kind of electric equipment, and when producing overcurrent or short circuit current on the circuit between power supply and electric load, it is open circuit automatically.
Molded case circuit breakers comprises the terminal unit that is connected on power supply or the electric load generally, be electrically connected to fixed contact and armature contact on the terminal unit, switching mechanism, by mobile armature contact to fixed contact position contacting or the position that separates with fixed contact, conversion (disconnecting or closure) circuit, and moment tripping mechanism, be used for when the big electric current greater than normal current flows through circuit, detecting (induction) big electric current, trigger switch mechanism moves it the position that is used for disconnecting (connection) circuit thus.
Usually use molded case circuit breakers, make it be connected with circuit with this structure, thus when the generation abnormal current, connect/cut off the electricity supply and electric load between circuit, or open circuit is protected electric load and circuit thus.
On the other hand, be different from the switching position that manually switching mechanism is driven into circuit, when producing abnormal current on circuit, molded case circuit breakers is sensed the abnormal current that is produced, and moves to the position of automatic shutoff circuit thus.This operation is called trip operation.
When the electric current that is equivalent to the several times rated current flows through circuit, need the moment trip avoidance function, so that make molded case circuit breakers sense this electric current, thus moment open circuit (promptly carrying out trip operation).
The present invention relates to a kind of raising mechanism that is used for the moment tripping operation of molded case circuit breakers.To the moment tripping mechanism according to the molded case circuit breakers of correlation technique be described now.
Fig. 1 is the sectional view of the structure of the existing molded case circuit breakers of expression, and Fig. 2 is the longitdinal cross-section diagram of expressing according to moment of the present invention tripping mechanism.
As represented among Fig. 1 and 2, existing molded case circuit breakers 100 comprises the fixed contact 110 and 120 that is connected on power supply or the electric load, armature contact 130, this armature contact 130 can rotate to its (OFF or TRIP) position (ON) and that separate with them that contacts with fixed contact 110 and 120, switching mechanism 140, be used for moving contact 130 is moved to contact or disconnected position, with the on/off circuit, handle 150, be connected on the switching mechanism 140, in order to driving switch mechanism 140 manually, moment tripping mechanism 160, the situation that is used for the big electric current that surpasses normal current is flow through circuit between power supply and the electric load is responded to, trigger switch mechanism 140 moves it trip position and the arc-extinguishing mechanism 170 of connecting circuit thus, be used for armature contact 130 and fixed contact 110 when 120 separate, eliminate the electric arc that is created between armature contact 130 and fixed contact 110 and 120.
Referring now to Fig. 2 moment tripping mechanism 160 the detailed structure according to the embodiment in the correlation technique is made an explanation.
As represented among Fig. 2, the fixed electromagnet according to the moment tripping mechanism 160 of correlation technique comprises on the lead that is arranged on regularly between fixed contact 110,120 and the terminal is used for when big electric current flows through circuit, produces and the big proportional magnetic attraction of electric current; With the armature 162 that is installed in fixed electromagnet 161 opposites, it can rotate near the position of fixed electromagnet 161 or away from the position of fixed electromagnet 161, and it has operating unit 162a, is used in the top part and carries out trip operation.
Tripping mechanism 160 according to correlation technique comprises reflector 163, the one end has lock arm 163a, the other end is connected on the switching mechanism 140, cross bar 164, it rotates to the locking or the position of unclamping reflector 163, and under the impetus of the operating unit 162a of armature 162, cross bar 164 can rotate to the position of unclamping reflector, and regulate dial 166, the side that it has as the cam surface is used to regulate the tripping current sensitivity of moment tripping mechanism.
Tripping mechanism 160 according to correlation technique also comprises first actuating force transmission bar 165, it has and the contacted upper end of cam surface 166a of regulating dial 166, with the lower end that is used for transmission of drive force, and this first actuating force is transmitted bar 165 and can be rotated according to the displacement of contact point on cam surface 166a, and this displacement comes from the rotation of adjusting dial 166; Second actuating force is transmitted bar 168, can rotatably be installed in the contacted position of upper end 162a with armature 162, transmits the actuating force of bar 165 and passes to armature 162 thereby will come from first actuating force; With spring 167, its upper end is transmitted bar 165 by first actuating force and is supported, its lower end is transmitted bar 168 by second actuating force and is supported, thereby the actuating force that will come from first actuating force transmission bar 165 passes to second actuating force and transmits bar 168, and maintain the relative position of regulating between dial 166 and first actuating force transmission bar 165 simultaneously, and second actuating force transmit relative position between bar 168 and the armature 162, with it as setting (adjusting) position.
The upper surface of regulating dial 166 has the link slot (not shown) that is used for screwdriver, regulates the tripping current sensitivity of molded case circuit breakers to allow the user.The side of regulating dial 166 is cam surface 166a, and it has the radius of variation, so that transmits bar 165 along with rotating with the contact position of cam surface 166a with contacted first actuating force of cam surface 166a.
Armature 162 is set at torsion spring (not providing its Reference numeral) bias voltage of its underpart, has accepted thus along the elastic force that more is close to fixed electromagnet 161 directions.The upper end 162a of armature 162 is transmitted bar 168 by second actuating force to be stopped.Therefore, armature 162 can be in constantly with fixed electromagnet 161 isolated states under.
Now will to according to correlation technique, have said structure be used to regulate molded case circuit breakers moment tripping mechanism the operation of tripping current sensitivity make an explanation.
Depend on distance between fixed electromagnet 161 and the armature about the sensitivity of tripping current.That is to say that the distance between them is short more, will obtain high more sensitivity, and the distance between them is long more, will obtain low more sensitivity.Thus, when adjustable range shortened it, tripping mechanism also can become as the sensitivity that starts trip operation, even work as normal current, just when the electric current that approaches rated current flows through.When adjustable range made it elongated, tripping mechanism was only carried out trip operation when remarkable electric current greater than rated current flows through circuit.
Thus, rotation is regulated dial 166 when obtaining the high sensitivity about tripping current in the clockwise direction, the upper end that first actuating force is transmitted bar 165 contacts with the position that cam surface 166a goes up than the long radius place, and the bar 165 of first actuating force transmission simultaneously is rotated in a clockwise direction.Thus, spring 167 descends, thereby discharges second actuating force transmission bar 168 that (unclamping) promoted.Afterwards, second actuating force transmission bar 168 is rotated in a clockwise direction.Thereby, the flexible bias pressure of torsion spring is imposed on armature 162, make armature 162 move a segment distance thus towards direction near fixed electromagnet 161, this segment distance transmits the distance that bar 168 has rotated through corresponding to second actuating force.Like this, the current sensitivity that flows through circuit that trip operation is started can be regulated De Genggao.
Opposite, in order to obtain muting sensitivity about tripping current, promptly in order to regulate the electric current on the circuit that is used to start trip operation, make it to be much higher than rated current, when dial 166 is regulated in rotation in the counterclockwise direction, the upper end that first actuating force is transmitted bar 165 contacts with the position at the small radii place of cam surface 166a, and the bar 165 of first actuating force transmission simultaneously rotates in the counterclockwise direction.Thus, spring 167 raises.Thereby promote second actuating force and transmit bar 168.Second actuating force is transmitted bar 168 rotation in the counterclockwise direction thus.Therefore, armature 162 overcomes the flexible bias pressure of torsion spring, thereby moves away fixed electromagnet 161 1 segment distances, and this displacement is transmitted the distance that bar 168 rotates through corresponding to second actuating force.Thus, the current sensitivity that flows through circuit that is used to start trip operation can be adjusted to lowlyer, just allow with respect to the big current practice armature 162 that flows through circuit.
Now will to according to correlation technique moment tripping mechanism trip operation make an explanation.
Flow through the electric current of circuit in adjusting, make tripping mechanism start after the trip operation, just after regulating trip sensitivity, if (for example on circuit, produced as the abnormal current as the big electric current that is equivalent to the several times rated current, short circuit current), then under the effect of big electric current, fixed electromagnet 161 is magnetized, and has produced bigger magnetic attraction thus.Here, the magnetic attraction of fixed electromagnet 161 is much larger than the braking force of being brought by spring 167 to second actuating force transmission bar 168.Therefore, the operating unit 162a of armature 162 transmits bar 168 with second actuating force and releases, and rotation in the counterclockwise direction, thus the lower end of hitting cross bar 164.Afterwards, under the effect of impact of the operating unit 162a of armature 162, cross bar 164 is rotated in a clockwise direction.Thus, lock arm is released, thereby and make reflector 163 rotation, trigger the switching mechanism 140 among Fig. 1 afterwards, make it to move to trip position.Thus, by moving of switching mechanism 140, make the armature contact 130 that is connected on the switching mechanism 140 with fixed contact 110 with opened in 120 minutes, thereby be in the tripped condition that circuit is disconnected.
The tripping mechanism that is used for molded case circuit breakers in the correlation technique has complicated structure, and utilizes the elastic force of spring 167 to be maintained fixed gap between electromagnet 161 and the armature 162.Thus, when a large amount of manufacturing molded case circuit breakers because the elasticity of spring 167 and non-constant, even thereby at a predetermined angle rotation regulate dial 166, fixed electromagnet 161 also may be different along with product with the gap between the armature 162.Therefore, disadvantageously be difficult to produce reliably, have the molded case circuit breakers of the constant current numerical value that is used to start trip operation.
On the other hand; often in family expenses and industrial distribution wire, use the layout that two molded case circuit breakers are installed; a molded case circuit breakers (promptly main molded case circuit breakers); be used for conversion and protection main circuit (promptly being close to the upper circuit of power supply); with a molded case circuit breakers (promptly auxiliary molded case circuit breakers); be used for conversion and protection auxiliary circuit (promptly the lower circuit that branches away from upper circuit is close to electric load equipment).Be equipped with in the circuit of layout of two molded case circuit breakers in protection; the trip sensitivity of supposing will to be used to have the molded case circuit breakers of instantaneous tripping mechanism is adjusted to roughly the same; the molded case circuit breakers of upper and lower circuit trips simultaneously; or, only make the molded case circuit breakers tripping operation of upper circuit with respect to obvious abnormal current greater than rated current.
Consider the priority of circuit protection, preferentially protect the load equipment that is positioned on the lower circuit in response to abnormal current, protect upper circuit afterwards, this is not preferred.Thus, need be installed in the molded case circuit breakers in the upper circuit, make and compare that instantaneous tripping operation can postpone with the molded case circuit breakers that is installed in the lower circuit.
Summary of the invention
Thus, one object of the present invention is to provide a kind of instantaneous tripping mechanism that is used for molded case circuit breakers, it can utilize simple mechanism to regulate tripping current sensitivity, and can construct reliable molded case circuit breakers by the constant sensitivity that tripping current is provided.
Another object of the present invention is to provide a kind of instantaneous tripping mechanism that is used for molded case circuit breakers, and in being installed on the molded case circuit breakers of upper circuit, it can postpone instantaneous tripping operation.
In order to obtain these and other advantages, and,, provide a kind of instantaneous tripping mechanism that is used for molded case circuit breakers as embodying at this and broadly explanation according to purpose of the present invention, it comprises: fixed electromagnet is used for producing according to electric current on the circuit magnetive attraction of change; Armature is faced setting mutually with fixed electromagnet, and can utilize the magnetive attraction of fixed electromagnet to rotate to the position that makes the molded case circuit breakers tripping operation when the big electric current that surpasses normal current flow through circuit; Spring is used for being elastically biased toward armature along the direction that makes armature leave fixed electromagnet; Regulate dial member, it has cam surface, is used to regulate the gap between armature and the fixed electromagnet; And adjusting rod, it has and the contacted end face of cam surface of regulating dial member, and the other end contact with armature, and rotatable, and the contact position by basis and the cam surface of adjusting dial member promotes (pushing) armature, thereby changes described gap.
According to another object of the present invention, the instantaneous tripping mechanism that is used for molded case circuit breakers also can comprise delay cell, and it is connected on the armature, is used for utilizing quiet inertia to postpone instantaneous tripping operation when the big electric current that surpasses normal current flows through circuit.
From below in conjunction with the detailed description of the present invention of accompanying drawing, aforementioned and other purposes of the present invention, feature, aspect and advantage will be more obvious.
Description of drawings
Accompanying drawing has been described embodiments of the invention, and is used for explaining principle of the present invention with specification, and these accompanying drawings are comprised in order to provide about further understanding of the present invention, is attached in this specification, and constitutes an one part.
In the drawings:
Fig. 1 is a sectional view of describing existing molded case circuit breakers;
Fig. 2 is a longitdinal cross-section diagram of describing the instantaneous tripping mechanism embodiment of correlation technique;
Fig. 3 is the perspective view of structure of describing according to an embodiment of the invention, be used for the instantaneous tripping mechanism of molded case circuit breakers;
Fig. 4 A and 4B are the views of the mode of operation of critical piece, described be used to regulate according to an embodiment of the invention, the operation of the tripping current sensitivity of the instantaneous tripping mechanism of molded case circuit breakers,
Wherein Fig. 4 A describes the state that tripping current sensitivity is heightened, and the starting current that is about to trip is adjusted to the state of little electric current, and Fig. 4 B describes the state that tripping current sensitivity is turned down, and the starting current that is about to trip is adjusted to the state of big electric current;
Fig. 5 is the perspective view of structure of describing according to another embodiment of the present invention, be used for the instantaneous tripping mechanism of molded case circuit breakers;
Fig. 6 A is the view of mode of operation of critical piece of describing according to another embodiment of the present invention, be used for the instantaneous tripping mechanism of molded case circuit breakers to 6C,
Wherein Fig. 6 A describes according to another embodiment of the present invention, the mode of operation of critical piece when the conduction normal current that is used for the instantaneous tripping mechanism of molded case circuit breakers, Fig. 6 B describes according to another embodiment of the present invention, the mode of operation of armature that is used for the instantaneous tripping mechanism of molded case circuit breakers, at first under attraction force acts, armature is moved towards fixed electromagnet, the delay counterweight is stopped, and Fig. 6 C describes according to another embodiment of the present invention, the mode of operation of delay counterweight that is used for the instantaneous tripping mechanism of molded case circuit breakers, this delay counterweight is stopped by quiet inertia, under the elastic force effect of spring element, this postpones the counterweight rotation, thereby hit cross bar, make the cross bar rotation thus.
Embodiment
Provide detailed description of the present invention referring now to accompanying drawing.
With reference now to accompanying drawing, the preferred embodiment that is used for the instantaneous tripping mechanism of molded case circuit breakers according to the present invention is made an explanation.The instantaneous tripping mechanism that is used for molded case circuit breakers according to the present invention can be with reference to the molded case circuit breakers shown in the figure 1.The same in the typical structure of the molded case circuit breakers shown in Fig. 1 and the aforementioned related art will do not carried out repetition of explanation to it thus.
At first, Fig. 3 is the perspective view of structure of describing according to an embodiment of the invention, be used for the instantaneous tripping mechanism of molded case circuit breakers.
As shown in Figure 3, according to an embodiment of the invention, the instantaneous tripping mechanism that is used for molded case circuit breakers comprises: fixed electromagnet 261, be used to produce magnetic force, it can change along with the electric current that flows through circuit; Armature 262, it is set at the opposite of fixed electromagnet 261, and when the big electric current that surpasses normal current flow through circuit, under the effect of the magnetic force that comes from fixed electromagnet 261, it can rotate to the position that makes the molded case circuit breakers tripping operation; Spring 267 is used for being elastically biased toward armature 262 towards the direction of separating with fixed electromagnet 261; Regulate dial member 266, it has the cam surface 266a that is used to regulate clearance G between armature 262 and the fixed electromagnet 261; With adjusting rod 265, it has and the contacted end 265a of cam surface 266a that regulates dial member 266, its other end 265b contacts with armature 262, and it is rotatable, so that push (promotion) armature 262, thereby change clearance G according to contact position with the cam surface 266a that regulates dial member 266.The other end 265b of adjusting rod 265 is formed curved shape, is used for engaging with armature 262.
In Fig. 3, Reference numeral 263 expressions are used for the switching mechanism of molded case circuit breakers is triggered to the reflector of trip position, and Reference numeral 264 expression cross bars are used for locking and discharge reflector 263, and Reference numeral 264a represents the lock bolt part of cross bar 264.And, among Fig. 3, Reference numeral 264b represents the actuating force transfer unit of cross bar 264, is used to accept the revolving force of armature 262, and Reference numeral 262a represents to be arranged at the sweep of armature 262 upper ends, is used for support spring 267 and engages with adjusting rod 265 at described other end 265b.The height of sweep 262a is determined consistent with the other end 265b of adjusting rod 265.Determine angle of bend, thereby prevent that armature is rotated in a clockwise direction, but during trip operation, under the effect of attraction, move, thereby can rotate in the counterclockwise direction towards fixed electromagnet 261.
The instantaneous tripping mechanism that is used for molded case circuit breakers according to the present invention shown in Fig. 3 also can comprise the unit that is connected on the spring 267, is used to change the angle between spring 267 and the armature 262, thus the flexible bias pressure of regulating spring 267.This unit that is used to change angle between spring 267 and the armature 262 comprises the support component 268 that is connected to the adjustment screw 268a on spring 267 1 ends and is used to support adjustment screw 268a.Here, support component 268 forms the flat board member with threaded portion, and threaded portion is set in the through hole that passes for adjustment screw 268a.
For example, when utilizing screwdriver to be rotated in a clockwise direction adjustment screw 268a, adjustment screw 268a travels forward by the through hole that is provided with threaded portion.Thus, the angle of 262 at spring 267 and armature becomes bigger.Thereby, armature 262 accepted along with the big moment of fixed electromagnet 261 detaching directions, just along the clockwise big moment of Fig. 3.In addition, when utilizing screwdriver to rotate adjustment screw 268a in the counterclockwise direction, adjustment screw 268a moves backward by the through hole that is provided with threaded portion.Thus, the angle of 262 at spring 267 and armature becomes littler.Thereby, armature 262 accepted along with the little moment of fixed electromagnet 261 detaching directions, just along anticlockwise little moment among Fig. 3.Thus, armature 262 accepted along with the moment of fixed electromagnet 261 detaching directions, just clockwise direction among Fig. 3.Yet the sweep of being located at armature 262 upper ends joins the other end 265b of adjusting rod 265 to, and this prevents that armature is rotated in a clockwise direction.
Now, will with reference to figure 4A and 4B to adjusting have this structure, according to an embodiment of the invention, the operation of trip sensitivity that is used for the instantaneous tripping mechanism of molded case circuit breakers makes an explanation.
Fig. 4 A and 4B are the views of critical piece mode of operation, and it has described the operation of the trip sensitivity that is used to regulate the instantaneous tripping mechanism that is used for molded case circuit breakers according to an embodiment of the invention.
Fig. 4 A describes tripping current sensitivity toward high situation of regulating, and the starting current that just will trip is turned down.
Fig. 4 B describes tripping current sensitivity toward low situation of regulating, and the starting current that just will trip is transferred big.
At first, screwdriver is inserted in the screwdriver insertion groove (Reference numeral that does not have appointment) that is formed on adjusting dial 266 end faces, afterwards to turn clockwise.As shown in Fig. 4 A, an end 265a of adjusting rod 265 contact with a part that has than long radius among the cam surface 266a that regulates dial 266 thus, and so rotates adjusting rod 265.Thereby armature 262 overcomes the elastic force of the spring 267 shown in Fig. 3, and along being rotated counterclockwise.The clearance G that armature 262 and fixed electromagnet are 261 narrows down thus.Therefore, when tripping mechanism had high trip sensitivity, tripping mechanism was just carried out trip operation at the electric current (for example, being equivalent to the electric current bigger tens percentage points than rated current) less times greater than rated current when flowing through circuit.
On the contrary, screwdriver is inserted in the screwdriver insertion groove, to be rotated counterclockwise.Afterwards as shown in Fig. 4 B, an end 265a of adjusting rod 265 contacts with the part of small radii among the cam surface 266a that regulates dial 266 thus.Therefore, the elastic force of spring shown in Fig. 3 267 is rotated counterclockwise adjusting rod 265.Thereby when the elastic force of spring shown in Fig. 3 267 turned clockwise armature 262, the clearance G that armature 262 and fixed electromagnet are 261 broadened thus.Therefore, when tripping mechanism had low trip sensitivity, tripping mechanism was obviously just being carried out trip operation greater than the electric current (the big electric current that for example, is equivalent to the several times of rated current) of rated current when flowing through circuit.
Below with reference to Fig. 3 the trip operation of the instantaneous tripping mechanism that is used for molded case circuit breakers is according to an embodiment of the invention made an explanation.
After adjusting is used to start electric current on the circuit of trip operation of tripping mechanism, just after regulating trip sensitivity, for example, when (for example on circuit, having produced abnormal current, short circuit current), as when being equivalent to the big electric current of several times rated current, fixed electromagnet 261 is by this big current magnetizations, thereby produce magnetic attraction greatly thus.Here, the magnetic attraction of fixed electromagnet 261 is more much bigger than the elastic force of spring 267.Thus, armature 262 rotates along the counter clockwise direction among the figure.By the promotion of armature 262, be rotated in a clockwise direction after the actuating force transfer unit 264b of cross bar 264.From reflector 263, discharge after the lock bolt part of cross bar 264.After this, the switching mechanism 140 that reflector 263 triggers among Fig. 1, thus make it to move to trip position.Therefore,, make the armature contact that is connected on the switching mechanism 140 130 with fixed contact 110 with opened in 120 minutes by driving switch mechanism, and open circuit thus, tripped condition promptly be in.
Fig. 5 is a perspective view of describing according to another embodiment of the present invention, be used for the instantaneous tripping mechanism structure of molded case circuit breakers.In the main molded case circuit breakers that will be close to power supply and two molded case circuit breakers being close to the auxiliary molded case circuit breakers of electric load are installed to situation on the power circuit, can with shown in Fig. 5 according to another embodiment of the present invention, the instantaneous tripping mechanism that is used for molded case circuit breakers is applied to molded case circuit breakers.In other words, another embodiment of the present invention is characterised in that it has tripping operation delay cell, is used to make main molded case circuit breakers to compare with auxiliary molded case circuit breakers, and tripping operation postpones.Therefore identical or similar in other structures in another embodiment of the present invention and operation and the aforementioned one embodiment of the invention will no longer explain them in detail.
As shown in Figure 5, according to another embodiment of the present invention, the instantaneous tripping mechanism that is used for molded case circuit breakers comprises: fixed electromagnet 261, be used to produce magnetic force, it can change along with the electric current that flows through circuit; Armature 262 is arranged at the opposite of fixed electromagnet 261, and when the big electric current that surpasses normal current flows through circuit, under the effect of the magnetive attraction that comes from fixed electromagnet 261, can rotates to the position that makes the molded case circuit breakers tripping operation; Spring 267 is used for being elastically biased toward armature 262 towards the direction of separating with fixed electromagnet 261; Regulate dial member 266, it has the cam surface 266a that is used to regulate clearance G between armature 262 and the fixed electromagnet 261; With adjusting rod 265, it has and the contacted end 265a of cam surface 266a that regulates dial member 266, its other end 265b contacts with armature 262, and it is rotatable, thereby push (promotion) armature 262 according to contact position, thereby change clearance G with the cam surface 266a that regulates dial member 266.The other end 265b of adjusting rod 265 forms curve (bending) shape, is used for engaging with armature 262.
In Fig. 5, Reference numeral 263 expressions are used for the switching mechanism of molded case circuit breakers is triggered to the reflector of trip position, Reference numeral 264 expression cross bars, and it is used for locking and discharges emission 263, and Reference numeral 264a represents the lock bolt part of cross bar 264.And, among Fig. 5, Reference numeral 264b represents the actuating force transfer unit of cross bar 264, is used to accept the revolving force of armature 262, Reference numeral 262a represents to be located at the sweep of armature 262 upper ends, is used for support spring 267 upper ends and engages with adjusting rod 265 at described other end 265b.
The instantaneous tripping mechanism that is used for molded case circuit breakers according to the present invention shown in Fig. 5 also can comprise the unit that is connected on the spring 267, and it is used to change the angle between spring 267 and the armature 262, thus the flexible bias pressure of regulating spring 267.This unit that is used to change angle between spring 267 and the armature 262 comprises the support component 268 that is connected to the adjustment screw 268a on spring 267 1 ends and is used to support adjustment screw 268a.Here, support component 268 forms the flat board member with threaded portion, and this threaded portion is set in the through hole that passes for adjustment screw 268a.
The instantaneous tripping mechanism that is used for molded case circuit breakers according to the present invention also can comprise delay cell 269 and 269a, and they are connected on the armature 262 and utilize quiet inertia, flows through the slow moment tripping operation of circuit time delay at the big electric current that surpasses normal current.
Delay cell 269 and 269a comprise spring element 269a, and this spring element 269a one end is fixed on the armature 262, be used for charging into elastic energy when armature 262 rotations, and discharge the elastic energy that has charged into after a period of time postpones; Counterweight 269, it is fixed to the other end of spring element 269a, be used for when armature rotates, providing quiet inertia force to spring element, thereby allow spring element to charge into elastic energy, and after predetermined delay, discharge elastic energy, under the effect of the elastic energy of spring element 269a, counterweight 269 can be rotated with spring element 269a.
Here, be provided with by groove 262b, so that allow rotatablely moving of counterweight 269 with corresponding to position, armature 262 tops.Preferably, spring element 269a is configured to leaf spring, and preferredly is configured for thin corrosion resistant plate.
Fig. 6 A is the view of mode of operation of critical piece of describing according to another embodiment of the present invention, be used for the instantaneous tripping mechanism of molded case circuit breakers to 6C, and wherein Fig. 6 A describes according to another embodiment of the present invention, is used for the mode of operation of critical piece when the conduction normal current of the instantaneous tripping mechanism of molded case circuit breakers.
As shown in Fig. 6 A, as the front about according to an embodiment of the invention, be used for the description of the instantaneous tripping mechanism of molded case circuit breakers, when normal current flows through the circuit that molded case circuit breakers is housed thereon, the sweep 262a (referring to Fig. 5) of armature 262 joins on the other end 265b of adjusting rod 265 in the position that is made it by spring 267 with fixed electromagnet 261 spaced apart setting clearance G, and armature keeps its position thus.In this state, spring element 269a keeps its state that is close to armature 262, charges into elastic energy in this state hardly.
Fig. 6 B has described such mode of operation, according to another embodiment of the present invention, the armature that is used for the instantaneous tripping mechanism of molded case circuit breakers at first moves towards fixed electromagnet under the effect of attraction, under quiet action of inertia, postpone counterweight afterwards and stop.
As shown in Fig. 6 B, when the big electric current that surpasses normal current flows through the main circuit that is close to the power supply that molded case circuit breakers has been installed, to fixed electromagnet 261 rotations, this fixed electromagnet 261 is by big current magnetization under the effect of the magnetic attraction of fixed electromagnet 261 for armature 262.After this, an end that is fixed to the spring element 269a on the armature 262 that is rotated counterclockwise among Fig. 6 B rotates in the counterclockwise direction with armature 262.Yet, being fixed under the quiet effect of inertia that counterweight produced on the other end, the other end of spring element 269a temporarily keeps its quiet state.Therefore, the mid portion of spring element 269a is bent, thereby has charged into elastic energy.
Fig. 6 C describes such mode of operation, according to another embodiment of the present invention, the delay counterweight that has stopped under quiet effect of inertia that is used for the instantaneous tripping mechanism of molded case circuit breakers is subjected to the effect rotation of flexible member elastic force and hits cross bar, rotary bar thus.
As shown in Fig. 6 C, after a period of time postpones, discharge the elastic energy that has charged at this moment by making the partly crooked therebetween spring element 269a that has charged into elastic energy of spring element 269a under the quiet inertia force effect that is produced in counterweight 269.Thus, counterweight 269 is also rotated in the counterclockwise direction along with the other end of spring element 269a, and the other end of spring element 269a rotates by means of the elastic energy that discharges from spring element 269a.
As previously described, the present invention can be provided for the instantaneous tripping mechanism of molded case circuit breakers, thereby produce the instantaneous tripping mechanism that is used for molded case circuit breakers effectively, it can utilize simple mechanism and regulate tripping current sensitivity simply, and by provide constant tripping current sensitivity to produce reliable molded case circuit breakers for each product.
In addition, after being installed in a molded case circuit breakers on the main circuit that is adjacent to power supply, another molded case circuit breakers being installed on the circuit that is adjacent to load, in the molded case circuit breakers on the circuit on being installed in (being main circuit), obtained being used for the instantaneous tripping mechanism of molded case circuit breakers effectively, thereby compare with the molded case circuit breakers on being installed in down circuit (promptly propping up circuit), more postpone to carry out instantaneous tripping operation.
Because the present invention can be embodied in several forms of not running counter to spirit of the present invention or inner characteristic, what therefore will also be understood that is, unless otherwise stipulate, the foregoing description is not subjected to the restriction of aforesaid any details, and should be considered as in the spirit and scope that claims limit, widely it being made an explanation, and thus, drop in claim border and the scope change and be out of shape or the equivalent of these borders and scope is all comprised by claims.
Claims (7)
1. instantaneous tripping mechanism that is used for molded case circuit breakers, it comprises:
Fixed electromagnet is used to produce magnetic force, and this magnetic force can change according to the electric current that flows through on the circuit;
Armature, it is configured in the face of this fixed electromagnet, and when the big electric current that surpasses normal current flows through circuit, is coming under the magneticaction of fixed electromagnet, and this armature can rotate to the position that makes the molded case circuit breakers tripping operation;
Spring is used for being elastically biased toward armature along the direction of separating with this fixed electromagnet;
Regulate dial member, it has the cam surface that is used to regulate gap between described armature and the described fixed electromagnet; With
Adjusting rod, its have with the contacted end of the cam surface of this adjusting dial member and with the contacted other end of this armature, and this adjusting rod can rotate, thereby according to the contacted position of cam surface of regulating dial member, change described gap by promoting described armature.
2. mechanism according to claim 1 wherein, also comprises the unit that is connected on the described spring, is used to change the angle between described spring and the described armature, thereby regulates the flexible bias pressure of this spring.
3. mechanism according to claim 2, wherein, the described unit that is used to change the angle between described spring and the described armature comprises:
Adjustment screw, it is connected on the end of described spring; With
Support component is used to support this adjustment screw.
4. mechanism according to claim 1 wherein, also comprises delay cell, and described delay cell is connected on the described armature, and utilizes quiet inertia, when the big electric current that surpasses normal current flows through circuit, postpones instantaneous tripping operation.
5. mechanism according to claim 4, wherein, described delay cell comprises the counterweight that is connected on the described armature.
6. mechanism according to claim 4, wherein, delay cell comprises:
Spring element, one end are fixed on the described armature, charge into elastic energy when armature rotates, and discharge the elastic energy that charges into after certain hour postpones; With
Counterweight, it is fixed on the other end of this spring element, and when rotating, armature provides quiet inertia force to described spring element, allow spring element to charge into elastic energy thus, and allow spring element after one section delay, to discharge elastic energy, under the effect of the elastic energy of spring element, this counterweight can be rotated with described spring element.
7. according to claim 5 or 6 described mechanisms, wherein, described counterweight has a part that is used to hit the relative part of molded case circuit breakers, makes this molded case circuit breakers tripping operation thus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101536755A CN101145475B (en) | 2006-09-12 | 2006-09-12 | Moulded case type circuit breaker instant tripping device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101536755A CN101145475B (en) | 2006-09-12 | 2006-09-12 | Moulded case type circuit breaker instant tripping device |
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| CN101145475A true CN101145475A (en) | 2008-03-19 |
| CN101145475B CN101145475B (en) | 2011-09-07 |
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| CN2006101536755A Active CN101145475B (en) | 2006-09-12 | 2006-09-12 | Moulded case type circuit breaker instant tripping device |
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| CN101719439A (en) * | 2009-11-19 | 2010-06-02 | 天津市百利电气有限公司 | Adjustable standby tripper of circuit breaker |
| CN101908447A (en) * | 2009-06-08 | 2010-12-08 | 三菱电机株式会社 | Circuit-breaker |
| CN102347175A (en) * | 2010-07-30 | 2012-02-08 | 上海良信电器股份有限公司 | Electronic releaser for molded case circuit breaker |
| CN102446666A (en) * | 2010-09-30 | 2012-05-09 | 北京人民电器厂有限公司 | Trip execution mechanism of circuit breaker |
| CN102543602A (en) * | 2010-12-23 | 2012-07-04 | Ls产电株式会社 | Tripping unit of molded shell and tube circuit breaker and circuit breaker with the same |
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| DE1098589B (en) * | 1954-03-18 | 1961-02-02 | Siemens Ag | Quick release, especially for installation in motor protection switches |
| US3944957A (en) * | 1974-12-23 | 1976-03-16 | General Electric Company | Flux-transfer trip device for a circuit breaker |
| DE19903911B4 (en) * | 1999-02-01 | 2004-09-23 | Ge Power Controls Polska Sp.Z.O.O. | Tripping device for switches and switch contact arrangement |
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| CN104160466A (en) * | 2012-03-05 | 2014-11-19 | 西门子公司 | Methods and apparatus for an improved magnetic armature selective tripping device of a circuit breaker |
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| CN102881532A (en) * | 2012-10-01 | 2013-01-16 | 北京人民电器厂有限公司 | Trip actuating device of circuit breaker |
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