CN2553506Y

CN2553506Y - Double-contact circuit breaker

Info

Publication number: CN2553506Y
Application number: CN02230766U
Authority: CN
Inventors: 金起永
Original assignee: Lg Electric Power Co ltd
Current assignee: Lg Electric Power Co ltd; LS Electric Co Ltd
Priority date: 2001-04-13
Filing date: 2002-04-12
Publication date: 2003-05-28
Anticipated expiration: 2012-04-12
Also published as: KR20020079185A; KR100417579B1; JP3089278U

Abstract

The utility model relates to a double-contact circuit breaker with four poles, which comprises three first fixed contact components, which are respectively provided with one contact and connected with three-phase AD power-supply, one second fixed contact component, which is provided with one contact and connected with the ground; three third fixed contact components, which are respectively provided with one contact and connected with the load to supply three-phase AC power-supply to the load; three first moveable contact component, which are respectively provided with a pair of contacts and can be moved to a certain position, and one pair of contacts on the position are communicated with the contact in the first fixed contact component and the contact in the third fixed contact component, or disconnected with the contact in the first fixed contact component and the contact in the third fixed contact component; one second moveable contact component, which is provided with one contact and communicated or disconnected with the second moveable contact component, wherein, the second moveable contact component rotates to make the moving angle for the communication or separating with the contact of the second fixed contact component smaller than the moving angle for the communication and disconnecting for the first fixed contact component and the contact in the first fixed contact component and the contact in the third fixed contact component, as well as the bracket.

Description

The double-contact type circuit breaker

Technical field

The utility model relates to a kind of double-contact type circuit breaker, more particularly, relate to a kind of double-contact type four-pole circuit breaker, wherein when circuit is connected, the neutral pole contact of ground connection is connected each other early than other utmost point contact, then be later than other utmost point contact during disconnection, therefore, improved the reliability and the fail safe of circuit breaker.

Background technology

Usually, circuit breaker is installed between electric loading and the power supply, so that protection electric loading, for example motor, electric or electronic installation when producing fault current (for example short circuit, earth fault or overcurrent) in electric loop (for example industrial power distribution loop).

Industrial circuit breaker is generally used for carrying out three-phase alternating current (AC) the power supply outage of maybe will loading to load, and corresponding for this reason every 3 fixed contacts and 3 moving contacts installed mutually are so that switch Switching power and load loop.This circuit breaker is called as three-phase breaker or three-pole breaker.

In addition,, then be referred to as four-pole circuit breaker, and the contact that is used for loop ground connection is called the neutral pole contact if circuit breaker also comprises a fixed contact and moving contact that is used for power supply and load loop ground connection.

Every 2 moving contacts and 2 fixed contacts of comprising mutually of double-contact type circuit breaker, the electricity that wherein produces when circuit switching switches is lonely to be shared by 2 contacts with high breaking capacity.

Introduce the double-contact type circuit breaker of prior art below with reference to Fig. 1.

Fig. 1 is the cross-sectional view of the double-contact type circuit breaker of prior art.

As shown in fig. 1, this double-contact type circuit breaker comprises: the first fixed contact element (fixedcondactor) 104, and it comprises the fixed contact element of 3 fixed contact elements that are connected with the three-phase AC power supplies and 1 ground connection; 4 second fixed contact elements 102 that are connected with load; 4 moving contact elements 106, be rotatably installed between the first fixed contact element 104 and the second fixed contact element 102, and can be connected with the second fixed contact element 102, or can separate with the second fixed contact element 102 with the first fixed contact element 104 with the first fixed contact element 104; Bearing support 116, rotatably mounted by the main body 113 of circuit breaker, and be used to support 4 moving contact elements 106 so that rotation simultaneously; Linkage 108, being connected with bearing support 116 and being used for rotation drives bearing support 116; Dropout operating mechanism 110 is used for when detecting overcurrent drive link mechanism 108 to disconnect this loop; Switch knob 112 is used for the manual switchover circuit breaker to connect (ON) loop or disconnection (OFF) loop; Arc extinguishing unit 114, be installed near the contact in the first fixed contact element 104 and the second fixed contact element 102 and the moving contact element 106, be used for when the first fixed contact element 104 and the second fixed contact element 102 and moving contact element 106 are connected each other or disconnected each other, the arc extinction that produces.

By a pin (not shown) 4 moving contact elements 106 are connected with bearing support 116, and by bearing support 116 supportings.

The connection of 4 moving contact elements 106 is identical with circuit breaker of the present utility model with supporting structure, therefore can the figure shows the bottom view of 4 moving contact elements and branching bolster structure with reference to Fig. 5.

With reference to Fig. 5, the part of pressing label 36 signs is pressed label 38 and 50 parts that indicate corresponding to moving contact element 106 corresponding to bearing support 116.

Each moving contact element 106 comprises: a support arm that constitutes moving contact element 106 bodies, and a pair of contact that is attached to these two ends of support arm.

The detailed structure of moving contact element 106 is identical with the utility model circuit breaker, therefore can be with reference to Fig. 6.

With reference to Fig. 6, the part of pressing label 36 signs is pressed label 40 and 42 parts that indicate corresponding to a pair of contact corresponding to support arm.

When by linkage 108 swivel bearing framves 116,4 moving contact elements 106 since they by a public bearing support 116 supportings also rotation simultaneously, and the first fixed contact element 104 is connected with the second fixed contact element 102 or is separated.

3 moving contact elements in 4 moving contact elements 106 (3 moving contact elements that refer to left side in Fig. 5) play the effect that switches in the loop between three-phase AC power supplies and the load, and remaining one is the neutral pole contact elements that is used for ground connection.

Tripping mechanism 110 comprises: trip unit 122, be used for detection of excessive current and when at load loop because electric leakage and short circuit generation actuating force when producing overcurrent; Nail shape part 124 is owing to the actuating force that trip unit 122 produces is rotated; And master jaw 126, be used for coming action link rod mechanism 108 according to the rotation of nail shape part 124.

Trip unit 122 can comprise usually: heat coil, generate heat when overcurrent takes place; And bimetal leaf, because heat coil and crooked and be used to produce actuating force.In addition, trip unit can be made of a coil and an operating mechanism, and this coil is used for producing pulling force when overcurrent takes place, and this operating mechanism is used for because this coil effect produces actuating force.

Linkage 108 comprises: claw 130 is locked or is released out by master jaw 126; Last connecting rod 132 is connected the core of claw 130 by a pin, and when (as shown in fig. 1) released out and be rotated counterclockwise to claw 130 by lock-out state, is rotated counterclockwise with claw 130; Lower link 134, its upper end utilize a pin 136 to be connected with last connecting rod 132, and its bottom is connected with bearing support 116, and owing to being rotated counterclockwise of last connecting rod 132 turns clockwise, bearing support 116 is used to turn clockwise; Spring 138, its bottom is connected with pin 136, and its upper end is connected with a supporting member that is connected with handle 14, is used to provide elastic energy, and connecting rod 132 and lower link 134 are gone up in rotation when releasing out claw 130 with box lunch.

To explain operation below according to the circuit breaker of the prior art of said structure.

When producing overcurrent, trip unit 122 detection of excessive current, and the actuating force of the operation that is provided for threading off are according to these actuating force nail shape part 124 rotations.

Then, master jaw 126 rotates along with the rotation of nail shape part 124, makes and is released out by the master jaw 126 of claw 130 lockings.

Correspondingly, along with spring 138 is shunk by extended state and pin 136 is upwards drawn, last connecting rod 132 is rotated counterclockwise, and lower link 134 turns clockwise.At this moment, utilize pin also to be rotated counterclockwise with the claw 130 that last connecting rod 132 is connected.

When lower link 134 turned clockwise, the bearing support 116 that utilizes pin to be connected with lower link 134 also turned clockwise.

Along with being rotated counterclockwise of bearing support 116, turn clockwise simultaneously by bearing support 116 common 4 moving contact elements 106 that support, and therefore each moving contact element 106 separates with the first fixed contact element 104 and the second fixed contact element 102.So circuit between deenergization and the load.

In load loop, produce after the reason elimination of overcurrent, for circuit breaker being returned the ON position, when the user moves to the ON position with handle 112, spring 138 is strained with downward promotion pin 136, make that going up connecting rod 132 turns clockwise, lower link 134 is rotated counterclockwise.

Then, bearing support 116 is rotated counterclockwise, and 4 moving contact elements 106 that supported by bearing support 116 are rotated counterclockwise, and the while and the first fixed contact element 104 and the second fixed contact element 102 are connected.Correspondingly, with the circuit closed between power supply and the load.

Simultaneously, when connecting the loop, the neutral pole contact is the contact in the neutral pole moving contact element and the connection of the contact in the fixed contact element, early than the connection of other utmost point contact (contact in other utmost point moving contact element and the contact in the fixed contact element); When cutoff circuit, the neutral pole contact disconnects the disconnection that then is later than other utmost point contact.

Its reason is because need ground connection, so arc current consumption that when switching circuit, produces between the contact, perhaps issuable leakage current consumption in load loop or in electric power loop, for guaranteeing the person and device security, by with path ground connection, ground connection before the loop between power supply and the load is connected, and, after cutoff circuit, continue the scheduled time for more careful safety.

Yet, in the double-contact type circuit breaker of routine, because the neutral pole moving contact element and the fixed contact element of ground connection, have the structure identical with the fixed contact element with other utmost point moving contact element, when the neutral pole moving contact element of ground connection and fixed contact element switches with the time point when disconnecting, time point during with other utmost point moving contact element and fixed contact element switches and disconnection is identical, and the problem of generation is the safety that can not guarantee the person and electric loading unit.

Summary of the invention

Therefore, the purpose of this utility model provides a kind of double-contact type four-pole circuit breaker, wherein when the loop between power supply and the load is connected, the contact of neutral pole contact is early than the contact of other utmost point contact, compare with the disconnection of other utmost point contact, therefore the disconnection of neutral pole contact has improved safety and reliability after postponing a scheduled time.

In order to realize these and other advantage, according to the purpose of this utility model,, provide a kind of double-contact type circuit breaker as that embodied in this specification and extensive introduction, comprise: 3 first fixed contact elements have a contact respectively and are connected with the three-phase AC power supplies; 1 second fixed contact element, it has a contact and ground connection; 3 the 3rd fixed contact elements have a contact respectively and are connected with electric loading, so that the three-phase AC power supplies to be provided to load; 3 first moving contact elements, has a pair of contact respectively, and be movable to a position, contact in a pair of contact in this position and the first fixed contact element and the contact in the 3rd fixed contact element are connected, perhaps with the first fixed contact element in contact and the contact in the 3rd fixed contact element disconnect, so that provide the three-phase AC power supplies, perhaps disconnect the current supply circuit between three-phase AC power supplies and the load to load; 1 second moving contact element, it has a contact, the contact of itself and the second fixed contact element is switched on or switched off, and be movable to the position of connecting with the contact of the second fixed contact element, or be movable to the position of separating with the contact of the second fixed contact element, wherein second moving contact element rotation, with the contact connection of the second fixed contact element or the move angle that separates, less than first fixed contact element rotation, the move angle of connecting or separating with contact in the first fixed contact element and the contact in the 3rd fixed contact element; And bearing support, be used to support first and second moving contact elements that need drive simultaneously.

In conjunction with the drawings to detailed introduction of the present utility model, make above-mentioned and other purpose of the present utility model, feature, various aspects and advantage will become more obvious.

Description of drawings

The accompanying drawing that is comprised is combined in this specification and constitutes the part of this specification, is used for further understanding the utility model, and these accompanying drawings are represented embodiment more of the present utility model, are used to explain principle of the present utility model together with explanation.

Wherein:

Fig. 1 is the sectional drawing according to the double-contact type four-pole circuit breaker of prior art;

Fig. 2 is the sectional drawing according to double-contact type four-pole circuit breaker of the present utility model;

Fig. 3 represents according to the utility model, when double-contact type four-pole circuit breaker and a loop are connected, and first moving contact element and linkage mode of operation end view;

Fig. 4 represents according to the utility model, when double-contact type four-pole circuit breaker and a loop disconnect, and first moving contact element and linkage mode of operation end view;

Fig. 5 represents according to the utility model, 4 moving contact elements in the double-contact type four-pole circuit breaker and the connection between the bearing support and the bottom view of support relation;

Fig. 6 be along the section line II-II among Fig. 5 got sectional drawing, expression is according to the utility model, when first moving contact element in the double-contact type four-pole circuit breaker and fixed contact element switches with the move angle when disconnecting;

Fig. 7 represents when the double-contact type four-pole circuit breaker is in ON (connection), the end view of the state of ground connection neutral pole contact and linkage unit;

Fig. 8 represents when the double-contact type circuit breaker is in disconnection, the end view of the state of ground connection neutral pole contact and linkage;

Fig. 9 be along the section line III-III among Fig. 5 got sectional drawing, expression is according to the utility model, when the ground connection neutral pole moving contact element in the double-contact type circuit breaker and fixed contact element switches with the move angle when disconnecting.

Embodiment

Introduce preferred embodiment of the present utility model with reference to the accompanying drawings in detail, accompanying drawing is represented some examples wherein.

According to the utility model several embodiment can be arranged, will introduce more preferred embodiment below.

Fig. 2 is the sectional drawing according to double-contact type four-pole circuit breaker of the present utility model.

Comprise according to double-contact type four-pole circuit breaker of the present utility model: 3 first fixed contact elements 4 ', have a contact 4 ' a respectively and be connected with the three-phase AC power supplies; 1 second fixed contact element 4 has a contact 4a and a ground connection respectively; 3 the 3rd fixed contact elements 2 have a contact 2a respectively and are connected with load, so that the three-phase AC power supplies to be provided to load; 3 first moving contact elements 38, have a pair of contact 40 and 42 respectively, and be movable to a wherein a pair of contact 40 and the 42 and first fixed contact element 4 ' in contact 4a ' and the contact 2a in the 3rd fixed contact element 2 connect, perhaps with the first fixed contact element 4 ' in contact 4a ' and the position that disconnects of the contact 2a in the 3rd fixed contact element 2, so that provide the three-phase AC power supplies, perhaps disconnect the current supply circuit between three-phase AC power supplies and the load to load; 1 second moving contact element 50, has a contact 54 respectively, the contact 4a of itself and second moving contact element 4 is switched on or switched off, and be movable to the position of connecting with the contact 4a of the second fixed contact element 4, or be movable to the position that disconnects with the contact 4a of the second fixed contact element 4, the move angle of second moving contact element 50 rotation wherein to connect or to separate with the contact 4a of the second fixed contact element 4, less than the rotation of first moving contact element 38, with the first fixed contact element 4 ' in contact 4a ' and the move angle that is switched on or switched off of the contact 2a in the 3rd fixed contact element 2; And bearing support 36, be used to support first moving contact element 38 and second moving contact element 50 that need drive simultaneously.

Fig. 2 is the sectional drawing of expression ground connection neutral pole contact, is used to explain the structure of circuit breaker of the present utility model, wherein because section that this circuit breaker is got is mainly expression ground connection neutral pole contact, so do not represent other three-phase AC electrode contact.

Therefore, though do not represent fixed contact element 4 ' and its contact 4a ', first moving contact element 38 and its contact 40 and 42 and fixed contact element 2 and its contact 2a in the drawings, they can be with reference to Fig. 6.

Introduce these feature structures of the present utility model same as the prior art below.

As with in the prior art components identical shown in Fig. 1, circuit breaker of the present utility model also comprises: linkage 10 is connected with bearing support 36 and is used to drive bearing support 36 rotations; Dropout operating mechanism 12 is used for drive link mechanism 10, disconnects a loop when detecting overcurrent with box lunch; Switch knob 14 is used for the described circuit breaker of manual switchover, makes the loop be in connection (ON) or disconnection (OFF) position; Arc extinguishing unit 16, installation site be near contact, and be used for when the first and second fixed contact elements 4 ' and 2 and moving contact element 38 extinguish the electric arc of generation when being switched on or switched off each other.

4 moving contact elements, promptly 3 first moving contact elements 38 and second moving contact element 50 utilize the pin (not shown) to be connected with bearing support 36, and by bearing support 36 supportings.

Bearing support 36 is supported rotationally by breaker body 13.

4 moving contact elements 38 with 50 with bearing support 36 be connected and supporting structure can be with reference to Fig. 5, Fig. 5 represents the bottom view according to the structure between 4 moving contact elements of the present utility model and the bearing support.

3 first moving contact elements (3 moving contact elements 38 in left side among Fig. 5) are carried out the handoff functionality between load and the three-phase AC power supplies, and all the other one second fixed contact elements (1 moving contact element 50 in the rightmost side among Fig. 5) are the neutral pole contact elements with grounding function.

As shown in Figure 2, according to second moving contact element 50 of the present utility model, be that unlike the prior art it is not connected with load by the fixed contact element.

On the contrary, as a jockey that is used for second moving contact element 50 is switched to load, be connected towards the end of loading in lead-in wire 56 and second moving contact element 50, and end bracket 58 and screw element (not indicating with label) be housed, 56 be connected with load so that will go between as link.

For example utilize the method for welding that end bracket 58 is connected with lead-in wire 56, this screw element passes in the end bracket 58 and installs.

By screw element ground lead is connected with load, realizes the connection between jockey and the load.

Provide lead-in wire 56 by many annealed copper wires of twisting or by a plurality of soft scale coppers of closed assembly, the feasible rotation of not disturbing second moving contact element 50.

Move angle when second moving contact element 50 moves to the position that the contact 4a in the one and second fixed contact element 4 is switched on or switched off, less than first moving contact element 38 move to the first fixed contact element 4 ' contact 4a ' and the contact 2a of the 3rd fixed contact element 2 move angle when being switched on or switched off the position, be described in detail below with reference to relevant accompanying drawing.

Dropout operating mechanism 12 comprises: trip unit 18 is used for detection of excessive current and load loop because the overcurrent that leakage current or short circuit cause produces actuating force; Nail shape part 19 rotates by the actuating force of trip unit; And master jaw 20, be used for according to the rotation of nail shape part 19 and drive link mechanism 10.

Trip unit 18 can comprise usually: heat coil, generate heat when overcurrent takes place; An and bimetal leaf, because heat coil and crooked and be used to produce actuating force.In addition, trip unit can be made of a coil and an operating mechanism, and this coil is used for producing pulling force when overcurrent takes place, and operating mechanism is owing to the coil tension produces actuating force.

Linkage 10 comprises: claw 24 is locked or is released out by master jaw 20; Last connecting rod 26 is connected the core of claw 24 by a pin, and when (as shown in Figure 2) released out and be rotated counterclockwise to claw 24 by lock-out state, is rotated counterclockwise with claw 24; Lower link 28, its upper end utilize a pin 30 to be connected with last connecting rod 26, and its bottom is connected with bearing support 36, owing to being rotated counterclockwise of last connecting rod 26 turns clockwise, so that turn clockwise bearing support 36; Spring 34, its bottom is connected with pin 130, and its upper end is connected with a supporting member that is connected with handle 14, is used to provide elastic energy, and connecting rod 26 and lower link 28 are gone up in rotation when releasing out claw 24 with box lunch.

Arc extinguishing unit 16 constitutes by a plurality of U-shaped arc quenching plates of closed assembly usually.

Fig. 3 represents according to the utility model, when double-contact type four-pole circuit breaker and a loop are connected, and first moving contact element and linkage mode of operation end view.

As shown in Figure 3, as first moving contact element 38, be provided for 3 moving contact elements of three-phase AC electrode, corresponding to each phase among the three-phase AC; Contact 40 and 42 longitudinally is attached to the both ends in first moving contact element 38, towards the first fixed contact element 4 ' and the 3rd fixed contact element 2.

Longitudinal center's part in 3 first moving contact elements 38 utilizes the pin (not shown) to be connected with bearing support 36, therefore by bearing support 36 supportings first moving contact element 38.

The bottom of lower link 28 utilizes pin (not indicating with label) to be connected with bearing support 36, and its upper end utilizes pin 30 to be connected with last connecting rod 26.

The top of last connecting rod 26 utilizes the pin (not shown) to be connected with the longitudinal center portion branch of claw 24.

The upper end of spring 34 is connected with the connector (not indicating with label) of handle 14 with one, and the bottom of spring 34 is connected with pin 30.As spring 34, preferably use a helical spring, storage elastic energy when its tension.

With reference to Fig. 3, when the user places ON (connection) position with handle 14, spring 34 tensions, in this state, active force from spring 34 is applied to connecting rod 26 by pin 30 clockwise directions, counterclockwise is applied to lower link 28 from the active force of spring 34 by pin 30.At this moment, master jaw 20 lock dog 24, as shown in Figure 2.

Correspondingly, the contact 40 and 42 in first moving contact element 38 keep with the first fixed contact element 4 ' in contact 4a ' and the state that is connected of contact 2a in the 3rd fixed contact element 2.

Fig. 4 represents when disconnecting according to double-contact type four-pole circuit breaker of the present utility model, first moving contact element and linkage mode of operation end view.

As shown in Figure 4, the structure of first moving contact element and linkage, with introduced among reference Fig. 2 and Fig. 3 identical, therefore, no longer it is described, and first moving contact element when circuit breaker disconnected and the operation of linkage are introduced.

Similar with prior art, when in load loop because electric leakage and short circuit when producing overcurrent, trip unit 18 detection of excessive current and providing for the actuating force of following closely shape part 19.

Then, because the actuating force of trip unit 18 makes 19 rotations of nail shape part,, claw 24 is released out from lock-out state because its rotary pawl seat 20 also rotates.

Then, the spring 34 of stretching shrinks and upwards spurs pin 30, and therefore, last connecting rod 26 and claw 24 are rotated counterclockwise (from figure).

Correspondingly, lower link 28 turns clockwise around pin 30 centers, the bearing support 36 that utilizes pin to be connected with lower link 28 also turns clockwise, thereby, first moving contact element, 38 anglec of rotation θ by bearing support 36 supportings, make the contact 40 and the 42 and first fixed contact element 4 ' in contact 4a ' and the contact 2a in the 3rd fixed contact element 2 disconnect, like this loop between power supply and the load is disconnected.

Fig. 5 represents according to the utility model, 4 moving contact elements in the double-contact type four-pole circuit breaker and the connection between the bearing support and the bottom view of support relation.

As shown in Figure 5,4 moving contact elements of bearing support 36 common supportings, bearing support 36 comprises supporting part, is used to support a plurality of moving contact elements and the shaft portion that is used to be connected this supporting part.Bearing support 36 is made by the molded synthetic resin material monolithic.

In Fig. 5,3 first moving contact elements 38 are provided in the left side, as 3 moving contact elements that are used for three-phase AC electricity, provide second moving contact element 50 in the rightmost side, as ground connection neutral pole moving contact element.

With the first fixed contact element 4 ' in contact 4a ' and the contact 2a contact 40 and 42 that is connected or disconnects in the 3rd fixed contact element 2, be attached to the vertical both ends in each first moving contact element 38.

Though contact 52 appends to towards the end of the second fixed contact element 4 of second moving contact element 50.The contact 52 that appends to the other end of second moving contact element 50 is actually useless, thereby can add.

Its reason is, Fig. 2 introduces as reference, and the other end of second moving contact element 50 often 56 is connected with the screw shaped part with end bracket 58 by going between, and not corresponding to the fixed contact of contact 54.

The contact 4a that second moving contact element 50 moves to the one and second fixed contact element 4 is switched on or switched off the move angle of position, less than first moving contact element 38 move to the one and first fixed contact element 4 ' in contact 4a ' and the move angle of the position that is switched on or switched off of the contact 2a in the 3rd fixed contact element 2, introduce this architectural feature below with reference to Fig. 6 and 9.

At first, as shown in Figure 6, be used for the longitudinal center of first moving contact element 38 of three-phase AC electrode, insert first hinge pin 44 of installing and pass its core (seeing the sectional drawing of bearing support 36 supporting parts), therefore by bearing support 36 supportings.

Spring 46 is inserted between the bearing support 36 and first moving contact element 38, contact 40 and 42 with convenient first moving contact element 38, with the first fixed contact element 4 ' in contact 4a ' and the contact 2a in the 3rd fixed contact element 2 when connecting, apply the power of keeping connection.

In more detail, the core of spring 46 on first hinge pin 44, end of spring 46 be connected mutually in the side-prominent projection 48 of bearing support 36, its another end is connected mutually with a upper surface of moving contact element 38.

Correspondingly, when bearing support 36 is rotated counterclockwise, the contact 40 and the 42 and first fixed contact element 4 ' in contact 4a ' and the contact 2a in the 3rd fixed contact element 2 when connecting, one elastic force is applied to first moving contact element 38, the elastic force direction make they and the first fixed contact element 4 ' in contact 4a ' and the contact 2a in the 3rd fixed contact element 2 connect, counterclockwise promptly.

In this respect, the elastic force of the spring of being introduced as reference Fig. 2 to 4 46 is less than the elastic force of spring 32.

When the loop between power supply and the load disconnects owing to the generation overcurrent, first moving contact element, 38 dextrorotation gyrations are that anglec of rotation α is identical with move angle, make the contact 40 and 42 in the moving contact element 38 of winning, with the first fixed contact element 4 ' in contact 4a ' and the 3rd fixed contact element 2 in contact 2a disconnect each other according to angle [alpha].

On the contrary, when the loop between power supply and the load is connected, it is that anglec of rotation α is identical with move angle that first moving contact element 38 is rotated counterclockwise angle, make the contact 40 and the 42 and first fixed contact element 4 ' in contact 4a ' and the 3rd fixed contact element 2 in contact 2a connect mutually.

Simultaneously, as shown in Figure 9, according to the utility model, the longitudinal center that is used for the second fixed contact element 50 of ground connection neutral pole inserts second hinge pin 62, hinge pin 62 is installed and is passed its underpart and divided from central division and reach a preset distance, (seeing the sectional drawing of bearing support 36 supporting parts).

Spring 60 inserts between the bearing supports 36 and second moving contact element 50, during with the connection of the contact 4a in the second fixed contact element 4, applies the power of keeping connection with the contact 54 of convenient second moving contact element 50.

In more detail, the core of spring 60 on second hinge pin 62, end of spring 46 be connected mutually in the side-prominent projection 64 of bearing support 36, its another end is connected mutually with a upper surface of second moving contact element 50.

Correspondingly, when bearing support 36 be rotated counterclockwise with the contact 54 and the second fixed contact element 4 in contact 4a when connecting, one elastic force is applied to second moving contact element 50, and the elastic force direction is connected the contact 4a in they and the second fixed contact element 4, counterclockwise promptly.

At this on the one hand, the elastic force of spring 60 less than as with reference to the elastic force of the spring 32 that Fig. 2 to 4 introduced.

When the loop between power supply and the load disconnects owing to the generation overcurrent, second moving contact element, 50 dextrorotation gyrations are that anglec of rotation β is identical with move angle, make and contact 54 in second moving contact element 50 and the contact 4a in the second fixed contact element 4 disconnect each other according to angle beta.

At this moment, in view of the bearing support 36 as benchmark, compare with first moving contact element 38, the installation of second moving contact element 50 is more near the first and second fixed contact elements 4 ' and 4.Therefore when the loop between power supply and the load disconnects, the time point that contact 4a in the contact 54 in second moving contact element 50 and the second fixed contact element 4 disconnects, be later than the contact 40 and 42 in first moving contact element 38, with the first fixed contact element 4 ' in contact 4a ' and the time point that disconnects of the contact 2a in the 3rd fixed contact element 2.

On the contrary, when the loop between power supply and the load is connected, it is that anglec of rotation β is identical with move angle that second moving contact element 50 is rotated counterclockwise angle, makes contact 54 in second moving contact element 50 and the contact 4a in the second fixed contact element 4 disconnect each other.

At this moment, when bearing support 36 during as benchmark, compare with first moving contact element 38, the installation of second moving contact element 50 is more near the first and second fixed contact elements 4 ' and 4, promptly, in other words, as shown in Fig. 6 and 9, anglec of rotation β is less than anglec of rotation α, the time point that contact 4a in the contact 54 in second moving contact element 50 and the second fixed contact element 4 connects, early than the contact 40 in first moving contact element 38 and 42 and the first fixed contact element 4 ' in contact 4a ' and the time point of the connection of the contact 2a in the 3rd fixed contact element 2.

Method according to second moving contact element 50 that neutral pole is installed, wherein compare with first moving contact element 38, the installation of second moving contact element 50 is more near the first and second fixed contact elements 4 ' and 4, longitudinal center in second moving contact element 40 can insert second hinge pin 62 and by its supporting, the installation of pin 62 is passed its underpart and reached a preset distance from the section center of bearing support 36 supporting parts.

According to another embodiment, insertion is by the hinge pin of bearing support 36 supportings second moving contact element 50, pass the core of bearing support 36, and it is different with first moving contact element, 38 setting angles, second moving contact element 50 can be installed on the hinge pin, compares with first moving contact element 38 more near the first and second fixed contact elements 4 ' and 4.

Fig. 7 represents when the double-contact type four-pole circuit breaker is in ON (connection), the side view of the state of ground connection neutral pole contact and linkage unit;

As shown in Figure 7,, provide one second moving contact element 50, an end on contact 54 is attached in second moving contact element 50 vertically, the contact 4a in the second fixed contact element 4 as the moving contact element that is used for ground connection.

Another end in end of lead-in wire 56 and second moving contact element 50 on vertical is connected.

As mentioned above, another end in second moving contact element 50 is useless, therefore can remove.

Another end of lead-in wire 56 is connected with end bracket 58.

The core of second moving contact element 50 on vertically utilizes a pin (not shown) to be connected with bearing support 36, makes and supports second moving contact element 50 by bearing support 36.

The bottom of lower link 28 utilizes a pin (not indicating with label) to be connected with bearing support 38, and the upper end utilizes a pin 30 to be connected with last connecting rod 26.

The upper end of last connecting rod 26 utilizes the core of a pin (not shown) and claw 24 on vertically to be connected.

Spring 34 is connected with the connector (not indicating with label) of handle 14 with one, and the bottom of spring 34 is connected with pin 30.

As spring 34, preferably use a helical spring, storage elastic energy when it is stretched.

As shown in Figure 7, when the user placed ON (connection) position with handle 14, spring 34 was in tension state, therefore because spring 34 by pin 30, will be gone up connecting rod 26 respectively and promote clockwise, lower link 28 was promoted counterclockwise.

At this moment, because master jaw 20 makes claw 24 be in locked state, as shown in Figure 2.

Correspondingly, the contact 54 in second moving contact element 50 keep with the second fixed contact element 4 in the on-state of contact 4a, and will load and grounded circuit is connected.

Fig. 8 represents when the double-contact type circuit breaker is in disconnection, the end view of the state of ground connection neutral pole contact and linkage.

As shown in Figure 8, therefore the structure of second moving contact element and linkage, is no longer introduced it, and first moving contact element when circuit breaker disconnects and the operation of linkage is introduced with identical with reference to what Fig. 2 and Fig. 7 introduced.

Below second moving contact element when the loop disconnects and the operation of linkage are introduced.

To similar in the prior art, when in load loop because electric leakage and short circuit when producing overcurrent, trip unit 18 detection of excessive current and provide actuating force to following closely shape part 19.

Actuating force by trip unit 18 makes 19 rotations of nail shape part, and master jaw 20 is along with the rotation of nail shape part 19 is also rotated, and makes claw 24 be released out by blocked state.

Then, the spring 34 that has stretched shrinks pin is upwards drawn, and correspondingly, last connecting rod 26 and claw 24 are rotated counterclockwise (from drawing).

Correspondingly, lower link 28 turns clockwise around pin 30 centers, the bearing support 36 that utilizes pin to be connected with lower link 28 also turns clockwise, and second moving contact element 50 by bearing support 36 supportings also turns clockwise, make contact 54 separate, the loop between load loop and the ground is connected disconnect with contact 4a in the second fixed contact element 4.

Below with reference to the overall operation of Fig. 2 to 9 explanation according to aforesaid double-contact type four-pole circuit breaker of the present utility model.

When in load loop because electric leakage and short circuit when producing overcurrent, trip unit 18 detection of excessive current and provide actuating force to following closely shape part 19.

Then, make 19 rotations of nail shape part by the actuating force of trip unit 18, master jaw 20 is along with the rotation of nail shape part 19 is also rotated, and makes claw 24 be released out by blocked state.

Then, the spring 34 that has stretched shrinks, and pin 30 is upwards drawn, and correspondingly, last connecting rod 26 and claw 24 are rotated counterclockwise (from drawing).

Correspondingly, lower link 28 turns clockwise around pin 30 centers, and the bearing support 36 that utilizes pin to be connected with lower link 28 also turns clockwise.

The contact 40 in first moving contact element 38 and the 42 and first fixed contact element 4 ' in contact 4a ' disconnection, contact 4a in second moving contact element 40 in the contact 54 and the second fixed contact element 4 postpones to disconnect, this time of delay, therefore poor corresponding between angle [alpha] and the β realized the disconnection in the loop between power supply and the load.

In load loop, produce after the reason elimination of overcurrent, for circuit breaker being returned the ON state, when the user moves to the ON position with handle 14, with spring 34 tensions, last connecting rod 26 is subjected to clockwise thrust from spring 34 by pin 30, lower link is subjected to counterclockwise thrust from spring 34 by pin 30, transfers the state shown in Fig. 3 and 7 to.

At this moment, by master jaw 20 claw 24 is locked, as shown in Figure 2.

At this moment, contact 4a in the contact 54 in second moving contact element 50 and the second fixed contact element 4 early connects, early the time poor corresponding between angle [alpha] and the β, guarantee safety so that connect grounded circuit, then, the contact 40 in first moving contact element 38 and the 42 and first fixed contact element 4 ' in contact 4a ' connection, make that the loop between power supply and the load is connected.

As mentioned above, double-contact type four-pole circuit breaker of the present utility model has following advantage.

When the loop disconnected, because the moving contact of three-phase AC electrode and fixed contact disconnect, after postponing a scheduled time, ground connection neutral pole contact and ground connection fixed contact disconnected.When this loop was connected, before the moving contact and fixed contact connection of three-phase AC electrode, ground connection neutral pole moving contact was connected with the fixed contact that is used for ground connection earlier simultaneously.Therefore can improve the safety and the reliability of circuit breaker.

Under the situation that does not break away from design of the present utility model or essential characteristic, the utility model can embody by several forms, should understand, the foregoing description and the details of can't help in the above-mentioned specification are limited to, unless stipulate in addition, and should constitute, therefore according to design and the scope broad sense that the claims that proposed limit, fall into all changes and improvement or equivalent in claims, comprise by the claims that propose.

Claims

1. a double-contact type circuit breaker is characterized in that, this circuit breaker comprises:

3 first fixed contact elements have a contact respectively and are connected with the three-phase AC power supplies;

1 second fixed contact element, it has a contact and ground connection;

3 the 3rd fixed contact elements have a contact respectively and are connected with electric loading, so that the three-phase AC power supplies to be provided to load;

3 first moving contact elements, has a pair of contact respectively, and be movable to a position, contact in a pair of contact in this position and the first fixed contact element and the contact in the 3rd fixed contact element are connected, perhaps with the first fixed contact element in contact and the contact in the 3rd fixed contact element disconnect, so that provide the three-phase AC power supplies, perhaps disconnect the current supply circuit between three-phase AC power supplies and the load to load;

1 second moving contact element, it has a contact, the contact of this contact and the second fixed contact element is switched on or switched off, and be movable to the position of connecting with the contact of the second fixed contact element, or be movable to the position of separating with the contact of the second fixed contact element, wherein second moving contact element rotation, with the contact connection of the second fixed contact element or the move angle that separates, less than first fixed contact element rotation, the move angle of connecting or separating with contact in the first fixed contact element and the contact in the 3rd fixed contact element; And

Bearing support, first and second moving contact elements that supporting drives simultaneously.

2. circuit breaker according to claim 1 is characterized in that, comprises that also one is connected to the jockey of load with second moving contact element.

3. circuit breaker according to claim 2 is characterized in that, described jockey comprises a lead-in wire and lead-in wire is connected to the link of load.