CN114078668A - Circuit breaker - Google Patents

Abstract

The invention provides a breaker which can quickly break the current after detecting the overload current and is easy to manage. A circuit breaker (100a) according to the present invention includes: a main shaft (25) that rotates in accordance with the movement of the link mechanisms (28, 29), rotates in the 1 st direction when the link mechanisms (28, 29) move in the closing direction, and rotates in the 2 nd direction when the link mechanisms (28, 29) move in the opening direction; a flexible conductor (35) which is electrically connected between the movable element (33) and the external connection terminal (37), is mechanically connected to the link mechanisms (28, 29), and can move the link mechanisms (28, 29) in the separation direction by being bent by an electromagnetic force generated by the energization between the movable element (33) and the external connection terminal (37); and a trip device (51a) which is used for releasing the engagement of the tripping latch (13) of the tripping rod (12) along with the rotation of the main shaft (25) in the 2 nd direction.

Description

Circuit breaker

Technical Field

The present invention relates to a circuit breaker having a trip device.

Background

A circuit breaker is a device that breaks a current when an accident such as an earth break or a short circuit occurs in a power transmission and transformation system or an electric circuit. The circuit breaker includes a breaking mechanism for breaking a current and a trip device for operating the breaking mechanism. When an accident occurs, the tripping device operates the breaking mechanism to break the current.

A conventional trip device includes a coil spring serving as a power source, a mechanism for transmitting power of the coil spring to a breaking mechanism unit, and a solenoid serving as a switch of the mechanism. The operation of moving the breaking mechanism unit in the trip device as described above is started by the tripping relay, which is an electronic circuit, detecting the overload current and sending an operation command to the solenoid. In the present operation mode, a time difference between the detection of the overload current and the start of the operation of moving the breaking mechanism unit is generally about 10 msec.

Patent document 1 describes a circuit breaker in which, in order to more rapidly break a current after detecting an overload current, a breaking mechanism unit is operated by a flexible means such as a spring, instead of operating the breaking mechanism unit by an operation command from a solenoid. The flexible unit rotates and operates the breaking mechanism unit when receiving an electromagnetic force of a current exceeding a predetermined correction threshold.

Patent document 1: japanese laid-open patent publication No. 9-288960

However, in the circuit breaker described in patent document 1, since the timing of operating the breaking mechanism unit depends on the threshold value of the flexible unit, when the flexible unit having a threshold value different from the current value of the rated breaking capacity or the flexible unit having a problem due to deterioration is provided in the circuit breaker, there is a possibility that the trip device cannot appropriately operate the breaking mechanism unit. Therefore, it is necessary to strictly manage the flexible unit so as to maintain an appropriate threshold value for operating the breaking mechanism portion.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a circuit breaker capable of quickly breaking a current after detecting an overload current and easily managing the current.

The circuit breaker of the invention comprises: a fixed contact; a movable member having a movable contact capable of being separated from and brought into contact with the fixed contact; a link mechanism which is linked with the movable element and can move in a closing direction for approaching the movable contact to the fixed contact and a separating direction for separating the movable contact from the fixed contact; a main shaft that rotates in accordance with the movement of the link mechanism, rotates in a 1 st direction when the link mechanism moves in the closing direction, and rotates in a 2 nd direction when the link mechanism moves in the opening direction; an external connection terminal connected to the external conductor; a flexible conductor which is electrically connected between the movable element and the external connection terminal, is mechanically connected to the link mechanism, and is deflected by an electromagnetic force generated by energization between the movable element and the external connection terminal, thereby moving the link mechanism in the separation direction; a trip latch for pulling the movable contact away from the fixed contact; a release lever that restricts an operation of releasing the release latch by engaging with the release latch; and a trip device which follows the rotation of the 2 nd direction of the main shaft and releases the clamping between the trip rod and the trip latch.

ADVANTAGEOUS EFFECTS OF INVENTION

The circuit breaker according to the present invention includes a trip device that releases engagement between a trip lever and a trip latch in response to rotation of a main shaft caused by flexure of a flexible conductor when a current greater than or equal to a rated breaking capacity flows, and therefore, the circuit breaker can break the current quickly and can be managed easily.

Drawings

Fig. 1 is a schematic side view of a closed circuit breaker according to embodiment 1.

Fig. 2 is a schematic side view of the circuit breaker according to embodiment 1 in a separated state.

Fig. 3 is an example of a schematic perspective view of a trip device according to embodiment 1.

Fig. 4 is an enlarged side view of the circuit breaker centering on the trip device of the circuit breaker in the separated state according to embodiment 1.

Fig. 5 is an enlarged side view of the circuit breaker according to embodiment 1, centering on the trip device of the circuit breaker in the closing operation.

Fig. 6 is an enlarged side view of the circuit breaker centering on the trip device of the circuit breaker in the closed state according to embodiment 1.

Fig. 7 is an enlarged side view of the circuit breaker centering on the trip device of the circuit breaker in the trip operation according to embodiment 1.

Fig. 8 is a schematic side view of the circuit breaker according to embodiment 1 after the trip operation.

Fig. 9 is an example of a schematic perspective view of a trip device according to embodiment 2.

Detailed Description

Embodiment 1.

Fig. 1 is a schematic side view of a closed circuit breaker 100a according to the present embodiment. In fig. 1, arrows F1 and F2 show the direction of the force.

Fig. 2 is a schematic side view of the circuit breaker 100a in the separated state according to the present embodiment.

Fig. 3 is an example of a schematic perspective view of the trip device 51a according to the present embodiment.

First, the structure of the circuit breaker 100a will be described with reference to fig. 1 to 3. Next, the operation of the circuit breaker 100a will be described.

As shown in fig. 1 and 2, the circuit breaker 100a includes a frame 41, a breaking mechanism 50, a trip device 51a, and a power conducting unit 60.

The structure of the circuit breaker 100a will be described in the order of the current carrying unit 60, the circuit breaking mechanism unit 50, and the trip device 51 a.

First, the current carrying portion 60 will be explained.

The current carrying portion 60 includes a current carrying portion link circuit 28, a current carrying portion link plate 29, a movable element shaft 30, a movable element holder 31, a movable element rotating shaft 32, a movable element 33, a movable contact 34, a flexible conductor 35, a fixed contact 36, an external connection terminal 37, a pressure contact spring 38, and a housing portion 70.

The pair of external connection terminals 37 are provided, and each of the external connection terminals penetrates a wall portion of a housing (not shown) that houses the circuit breaker 100a and is fixed to the housing.

One external connection terminal 37 is connected to a load-side conductor (not shown) outside the housing. The other external connection terminal 37 is connected to a power supply side conductor (not shown) outside the housing.

The frame 41 may be a part of the housing. The conducting portion link circuit 28 of the conducting portion 60 is connected to the breaking mechanism 50.

A fixed contact 36 is provided at the other end of the external connection terminal 37 having one end connected to the power supply side conductor. The flexible conductor 35 is connected to the other end of the external connection terminal 37 having one end connected to the load side conductor.

The movable element 33 is disposed opposite to the fixed contact 36.

The movable contact 34 is fixed to the movable element 33 and can be separated from and brought into contact with the fixed contact 36.

A flexible conductor 35 having flexibility is electrically connected between the mover 33 and the external connection terminal 37. One end of the flexible conductor 35 is connected to the external connection terminal 37, and the other end is connected to the energization portion link plate 29. In the present invention, "connected" is not particularly specified, and means mechanical connection, and includes not only direct connection without passing through other components but also indirect connection via other components. In addition, in the case of electrical connection, the reference is made to "electrical connection".

The pressure contact spring 38 is connected to the opposite side of the end of the flexible conductor 35 from the side supporting the current carrying portion link plate 29. The housing 70 houses the pressure contact spring 38. The housing section 70 may be shared with the housing.

The movable member shaft 30 is rotatably supported by the movable member 33.

The end of the movable element 33 on the side of the flexible conductor 35 is connected to the conducting portion link plate 29 via the movable element shaft 30.

One end of the mover holder 31 is rotatably supported by the mover shaft 30, and the other end is rotatably supported by the mover rotating shaft 32.

The link mechanism including the energization portion link circuit 28 and the energization portion link plate 29 is formed of an insulating material.

The energization portion link plate 29 is supported on the movable element 33 side so as to be rotatable with the movable element shaft 30. Further, the current carrying portion link plate 29 is fixed to the current carrying portion link passage 28 on the disconnecting mechanism 50 side. As is clear from comparison between fig. 1 and 2, if the link mechanism approaches the fixed contact 36, the movable element 33 rotates clockwise in conjunction with the approach of the link mechanism, and the movable contact 34 and the fixed contact 36 are closed. When the link mechanism is separated from the fixed contact 36, the movable element 33 rotates counterclockwise in conjunction with the separation of the fixed contact 36 from the movable contact 34. As described above, the link mechanism is movable in the closing direction in which the movable contact 34 is brought close to the fixed contact 36 and the separating direction in which the movable contact 34 is separated from the fixed contact 36. As will be described later, the link mechanism is connected to an arm plate 27 via an arm shaft 26, and the arm plate 27 is fixed to the main shaft 25 and rotates together with the main shaft 25. The circuit 80 includes the movable element 33, the movable contact 34, the flexible conductor 35, the fixed contact 36, and the external connection terminal 37.

Next, the breaking mechanism 50 will be explained.

The breaking mechanism 50 includes a trip lever 11, a trip bar 12, a trip latch 13, a trip latch shaft 14, a roller 15, a roller shaft 16, a frame shaft 17, a link lever 18, a link path 19, a link lever shaft 20, a link plate 21, a link path shaft 22, an arm path 23, a link plate shaft 24, a main shaft 25, an arm shaft 26, and an arm plate 27.

The arm plate 27 is supported rotatably with the arm shaft 26. The arm plate 27 is connected to the energizing portion link line 28 via the arm shaft 26.

The main shaft 25 is rotatably supported by the frame 41. As will be described in detail later, the main shaft 25 rotates in accordance with the movement of the link mechanism, and rotates counterclockwise (1 st direction) when the link mechanism moves in the closing direction, and rotates clockwise (2 nd direction) when the link mechanism moves in the opening direction.

The arm path 23 and the arm plate 27 are fixed to the main shaft 25. The fixing to the main shaft 25 may be any of a screw, a rivet, or a weld.

The arm path 23 and the link plate 21 are rotatably connected by a link plate shaft 24.

The link 19 and the link plate 21 are rotatably connected by a link shaft 22.

The other end of the trip latch 13 is rotatably connected to the frame 41 via a trip latch shaft 14.

In addition, a part of the trip latch 13 is engaged with the trip lever 12.

The trip lever 12 is rotatably supported to the frame 41.

The engaging portion between the trip lever 12 and the trip latch 13 is D-shaped. When engaging with the D-shaped arc portion 12a of the trip lever 12, the attitude of the trip latch 13 is held by a return spring (not shown) for regulation. When the engagement and disengagement are released by the restriction, the movable contact 34 is pulled away from the fixed contact 36, and the circuit breaker 100a is opened.

The trip lever 12 engages with the trip latch 13, thereby restricting the operation of opening the trip latch 13.

The trip lever 11 is fixed to the trip bar 12.

The link lever 18 is rotatably supported by a frame shaft 17 provided on the frame 41. The link lever 18 and the link path 19 are rotatably connected to a link lever shaft 20.

In the closed state of the circuit breaker 100a shown in fig. 1, the roller 15 is held by the engagement surface 13a on the release latch 13. The link lever 18 and the roller 15 are rotatably connected via the roller shaft 16.

At the time of disconnection, the main shaft 25 rotates the trip lever 12, which is the disconnection mechanism 50, by rotation of the lever 3 provided to the main shaft 25, and the main shaft 25 is disengaged from the trip latch 13. The breaking operation will be described later.

Next, the trip device 51a will be explained.

As shown in fig. 3, the trip device 51a includes a trip device link 1, a reverse operation preventing link 2, a lever 3, a slide shaft 4a, a slide shaft 4b, a frame pin 5, a frame portion, a return spring 8, and a holding spring 9. The frame portion in the present embodiment is composed of the 1 st frame 6 and the 2 nd frame 7.

As will be described in detail later, the trip device 51a releases the engagement between the trip lever 12 and the trip latch 13 in accordance with the clockwise rotation of the main shaft 25.

The 1 st frame 6 is fixed to the frame 41 by fixing screws 10. In the present embodiment, the fixing screw 10 is used, but any one of caulking and welding may be used.

The 2 nd frame 7 is fixed to the 1 st frame 6 by the frame pin 5 at a position opposite to the 1 st frame 6.

The 1 st frame 6 and the 2 nd frame 7 each have a long hole 6a and a long hole 7 a. The elongated hole 6a and the elongated hole 7a face each other.

The trip device link 1 is sandwiched between the 1 st frame 6 and the 2 nd frame 7 and movably supported by the sliding shaft 4 a. The trip device link 1 is slidable in the longitudinal direction of the elongated holes 6a and 7a by the slide shaft 4 a.

The reverse operation preventing link 2 is located between the 1 st frame 6 and the 2 nd frame 7, and is movably supported by the sliding shaft 4b on the inner side of the trip device link 1. The slide shaft 4b allows the reverse operation preventing link 2 to slide in the longitudinal direction of the elongated hole 7a of the 2 nd frame 7. The anti-reverse operation link 2 is rotatable about the slide shaft 4 b.

The lever 3 is fixed to the main shaft 25. Thus, the lever 3 moves while the main shaft 25 rotates. In the present embodiment, the lever 3 and the spindle 25 are fixed by a fixing screw, but may be fixed by caulking or welding.

The trip device link 1 is moved to push the trip lever 11. As a result, the engagement between the trip lever 11 and the trip latch 13 is released.

The return spring 8 is connected to the trip device link 1, and holds the posture of the trip device link 1 in the closed state.

The holding spring 9 is held by the slide shaft 4b, and engages with the slide shaft 4a and the reverse operation preventing link 2.

Here, the operation task of the circuit breaker 100a will be described. The O task and the CO task are present in the operation task of the circuit breaker. The O task is a task in which the circuit breaker performs a breaking operation when the circuit is in a short-circuit state due to a factor other than the circuit breaker in a closed state of the circuit breaker. The CO task is a task in which an accident occurs/remains on the load side when the breaker is in the open state, and the breaker performs a breaking operation when the circuit is in the short-circuited state due to the closing of the breaker into the closed state.

Next, a trip operation of the circuit breaker 100a according to the present embodiment at the time of the CO mission will be described.

Fig. 4 is an enlarged side view of the circuit breaker 100a centering on the trip device 51a of the circuit breaker 100a in the separated state. Arrow F3 shows the direction of the force.

Fig. 5 is an enlarged side view of the circuit breaker 100a centering on the trip device 51a of the circuit breaker 100a in the switching operation from the open state to the closed state. In this operation, the main shaft 25 rotates counterclockwise as indicated by an arrow M in fig. 5.

Fig. 6 is an enlarged side view of the circuit breaker 100a centering on the trip device 51a of the circuit breaker 100a in the closed state.

The operation from the open state of fig. 4 to the closed state of fig. 6 via fig. 5 will be described.

The trip device link 1 of fig. 4 is provided to push the trip lever 11. In the disengaged state, the trip device link 1 is pulled toward the return spring 8 by the force F3 generated by the return spring 8, and is stabilized at a stable position where it does not press the trip lever 11.

The reverse operation preventing link 2 is pressed against the engaging surface 1a of the trip device link 1 by a counterclockwise torque about the slide shaft 4b generated by the holding spring 9, and is thereby positioned at a stable position. This stable position of the anti-reverse operation link 2 is a position where the lever 3 contacts the anti-reverse operation link 2 when the lever 3 rotates together with the main shaft 25.

Next, the closing operation will be described with reference to fig. 1 and 5. Arrow F1 of fig. 1 shows the force generated by the roller 15.

The roller 15 is moved by a closing lever (not shown) which is moved by a handle (not shown) of the circuit breaker 100a, and applies a force F1 to the engagement surface 13a of the trip latch 13. The release latch 13 is rotated counterclockwise about the release latch shaft 14 by the force F1, and the release latch 13 is biased until it engages with the arc portion 12a of the release lever 12 shown in fig. 6. At this time, the energy storage arm 39 shown in fig. 1 rotates in the counterclockwise direction.

By the counterclockwise rotation of the charging arm 39, the joint of the link 19 and the link plate 21 moves toward the spindle 25, and the link plate shaft 24 and the arm shaft 26 move in the direction approaching the fixed contact 36. This causes the arm plate 27 to rotate counterclockwise with respect to the main shaft 25, and the main shaft 25 also rotates counterclockwise (in the direction of arrow M shown in fig. 5). The torque applied to the main shaft 25 at this time is set to the 1 st torque. That is, the main shaft 25 is rotated by applying the 1 st torque in the 1 st direction generated by the rotation of the energy storage arm 39. Further, when the link plate shaft 24 and the arm shaft 26 move in the direction approaching the fixed contact 36, the link mechanism constituted by the current-carrying portion link path 28 and the current-carrying portion link plate 29 moves in the direction approaching the fixed contact 36, that is, the closing direction. The movable element 33 is thereby rotated in the clockwise direction, and the movable contact 34 and the fixed contact 36 are brought into a closed state.

As shown in fig. 5, the lever 3 provided on the spindle 25 rotates counterclockwise as the spindle 25 rotates counterclockwise. Thereby, the lever 3 contacts the contact surface 2b of the reverse operation preventing link 2, and presses the reverse operation preventing link 2 in a direction away from the trip lever 12. Thereby, the reverse operation preventing link 2 rotates clockwise about the slide shaft 4 b. At this time, the rotational force is accumulated as an elastic force in the holding spring 9. If the lever 3 is separated from the reverse operation preventing link 2 during the rotation of the lever 3, the reverse operation preventing link 2 is rotated counterclockwise by the elastic force accumulated around the sliding shaft 4b, and is returned to the stable position. As described above, the reverse operation preventing link 2 rotates clockwise about the sliding shaft 4b with respect to the counterclockwise rotation of the lever 3, and thus the trip device link 1 can be held at the stable position without rotating the trip device link 1 toward the lever 3. As a result, the trip device link 1 is in the closed state shown in fig. 6.

Next, a trip operation from the closed state will be described.

Fig. 7 is an enlarged side view of the circuit breaker 100a centering on the trip device 51a of the circuit breaker 100a in the trip operation. Arrow M shows the direction of the force.

Fig. 8 is a schematic side view of the circuit breaker 100a after the trip operation.

The trip operation will be described with reference to fig. 1, 7, and 8.

In a state where a load side accident occurs or remains, if the breaker 100a is closed to the closed state shown in fig. 1, an overload current flows between the external connection terminal 37 connected to the load side conductor and the external connection terminal 37 connected to the power side conductor, and a force F2, which is an electromagnetic force, is generated in the flexible conductor 35.

Flexible conductor 35 is deflected by force F2 toward the orientation of arrow F2. Then, the mover holder 31 and the mover shaft 30 rotate counterclockwise about the mover rotational shaft 32. Further, since the conducting portion link plate 29 and the conducting portion link path 28 also move in the opening direction, that is, the release latch 13, the arm shaft 26 is rotated via the conducting portion link plate 29 and the conducting portion link path 28. As a result, the arm plate 27 moves in the direction of the trip latch 13, and the 2 nd torque rotating clockwise is applied to the main shaft 25.

When the movable element shaft 30 rotates counterclockwise by the movement of the flexible conductor 35, the movable contact 34 is separated from the fixed contact 36. When the movable contact 34 is separated from the fixed contact 36, a current force compensation effect of pulling the movable contact 34 toward the fixed contact 36 is generated in the circuit breaker 100 a. That is, the 2 nd torque is generated to rotate the mover 33 clockwise in fig. 1 about the mover shaft 30.

If the torque for rotating the main shaft 25 in the clockwise direction exceeds the torque for rotating the main shaft 25 in the counterclockwise direction, the main shaft 25 rotates in the clockwise direction. As a result, the lever 3 rotates clockwise together with the spindle 25. Further, the flexible conductor 35 moves, the pressure contact spring 38 expands, and the movable element 33 rotates counterclockwise, so that the movable contact 34 is separated from the fixed contact 36.

As shown in fig. 7, the lever 3 that rotates clockwise together with the spindle 25 contacts the contact surface 2a of the anti-reverse operation link 2. As a result, the trip device link 1, the reverse operation preventing link 2, and the holding spring 9 are pushed up and moved toward the trip lever 11 in the longitudinal direction of the elongated holes 6a and 7 a.

The moved trip device link 1 contacts the contact surface 11a of the trip lever 11 to move the trip lever 11. Then, the contact surface 11a of the trip lever 11 rotates the trip bar 12 counterclockwise.

If the trip lever 12 is rotated counterclockwise, the arc portion 12a of the trip lever 12 does not contact the tip end portion of the engaged trip latch 13. That is, the release lever 12 that supports the release latch 13 disappears, and thus the engagement is released. As a result, as shown in fig. 8, the circuit breaker 100a moves to a position where the trip latch 13 trips, and is broken. If the lever 3 is not in contact with the reverse operation preventing link 2 by the clockwise rotation of the lever 3, the trip device link 1 drops due to its own weight and the reverse operation preventing link 2 returns to the stable position.

When the reverse operation preventing link 2 is pressed by the clockwise rotation of the lever 3, it contacts the frame portion and is prevented from rotating so as not to rotate relative to the frame portions (the 1 st frame 6 and the 2 nd frame 7) more than the above-described stable position.

When a current greater than or equal to the rated breaking capacity flows, the trip device 51a according to the present embodiment starts the tripping operation of the breaking mechanism 50 by rotating the lever 3 provided to the main shaft 25 together with the main shaft 25 and moving the trip device link 1, and thus can break the current without strict management.

In the case of a circuit breaker in which the trip device operates in accordance with the threshold value of the spring, there is a possibility that the trip device 51a cannot be operated properly in the case where there is a problem or the like. On the other hand, in the circuit breaker 100a according to the present embodiment, the trip device 51a is moved by the lever 3 that rotates together with the rotation of the main shaft 25, and the trip mechanism 50 can be reliably tripped.

Further, since the lever 3 can be made of a material having no flexibility, it has high durability and is easy to manage as compared with a flexible unit.

In the CO mission, when an overload current exceeding the rated breaking capacity of the breaker 100a is applied, the breaking mechanism 50 is pushed back to the open state, which takes time to perform a trip operation and may make it difficult to secure a margin of time for a reclosing operation. According to the present embodiment, when an overload current is applied after the closing operation of the short circuit, the lever 3 rotates together with the rotation of the main shaft 25, and thereby the trip device 51a is moved without delay when the movable contact 34 is separated from the fixed contact 36, and the trip operation of the breaking mechanism 50 is started. Therefore, a margin of time can be secured for the reclosing operation.

Further, by providing the reverse operation preventing link 2, it is possible to suppress the trip device link 1 from being moved by the lever 3 rotating together with the rotation of the main shaft 25 at the time of the closing operation, and therefore it is possible to suppress a malfunction such as starting the trip operation other than at the time of the breaking operation.

Embodiment 2.

The difference between embodiment 1 and embodiment 2 is the shape of the trip device. In embodiment 1, the trip device is configured such that the frame portions are the 1 st frame and the 2 nd frame which are independent from each other, but in embodiment 2, the frame portions are configured in a state where at least a part of the 1 st frame and the 2 nd frame are connected to each other.

In the following, only the differences from embodiment 1 will be described, and descriptions of the same or corresponding parts will be omitted. The same or corresponding portions as those in embodiment 1 are denoted by the same reference numerals, and description thereof is omitted.

Fig. 9 is a schematic perspective view of a trip device 51b according to the present embodiment.

As shown in fig. 9, the trip device 51b includes a trip device link 1, a reverse operation preventing link 2, a lever 3, a slide shaft 4a, a slide shaft 4b, a frame pin 5, a return spring 8, a holding spring 9, and a frame member 90.

The 1 st frame and the 2 nd frame of the trip device 51a according to embodiment 1 are connected by a frame pin 5. In the present embodiment shown in fig. 9, a portion connected by the frame pin 5 is defined as a trip device 51b formed as a part of the frame portion 90.

In fig. 9, the frame pin 5 on the return spring 8 side in embodiment 1 is a part of the frame portion 90 of the present embodiment. In fig. 9, the frame portion 90 is provided on the return spring 8 side, but the frame pin 5 on the side opposite to the return spring 8 may be provided integrally as the frame portion 90, or both may be provided as the frame portions 90.

As in embodiment 1, when a current greater than or equal to the rated breaking capacity flows, the trip device 51b according to the present embodiment rotates together with the main shaft 25 and pushes the trip device link 1 against the trip lever 11 to start the trip operation of the breaking mechanism 50, and thus can break the current without strict management.

Further, in the same manner as in embodiment 1, if the breaker is a breaker that performs a trip operation according to the threshold value of the spring, there is a possibility that the trip device may not be operated properly in the case where there is a problem or the like. On the other hand, in the circuit breaker 100b according to the present embodiment, the trip device 51b is moved by the lever 3 that rotates together with the rotation of the main shaft 25, and therefore, the trip operation of the breaking mechanism 50 can be reliably performed. Further, since the lever 3 can be made of a material having no flexibility, it has high durability and is easy to manage as compared with a flexible unit.

Further, according to the present embodiment, as in embodiment 1, when the circuit is opened after closing the short circuit, the lever 3 is rotated together with the rotation of the main shaft 25, whereby the trip device 51b can be started to trip without delay, and therefore, a margin of time for starting the reclosing operation after the circuit is opened can be secured.

In the trip device 51b according to the present embodiment, at least a part of the frame portion is connected to each other, so that the strength of the entire structure of the trip device 51b can be improved. Further, the reliability of the trip operation of the circuit breaker can be improved.

Description of the reference numerals

1 trip device connecting rod

2 anti-reverse action connecting rod

3 lever

4a, 4b sliding shaft

5 frame pin

6 st frame

7 nd 2 nd frame

6a, 7a long hole

8 reset spring

9 holding spring

10 set screw

11 trip lever

12 trip bar

13 trip latch

14 trip latch shaft

15 roller

16 roll shaft

17 frame shaft

18-bar lever

19 link circuit

20 link lever shaft

21 link plate

22 link shaft

23 arm way

24 connecting rod plate shaft

25 spindle

26 arm shaft

27 arm board

28-electrifying part connecting rod circuit

29 electrifying part connecting rod plate

30 movable member shaft

31 movable member holder

32 rotating shaft of movable member

33 Movable part

34 movable contact

35 Flexible conductor

36 fixed contact

37 external connection terminal

38 crimping spring

50 circuit breaking mechanism part

51a, 51b trip unit

60 electrifying part

70 receiving part

90 frame part

100a, 100b circuit breaker

Claims (8)

1. A circuit breaker, having:

a fixed contact;

a movable member having a movable contact separable from and contactable with the fixed contact;

a link mechanism which is linked with the movable element and is capable of moving in a closing direction in which the movable contact is close to the fixed contact and in a separating direction in which the movable contact is separated from the fixed contact;

a main shaft that rotates in accordance with the movement of the link mechanism, and rotates in a 1 st direction when the link mechanism moves in the closing direction, and rotates in a 2 nd direction when the link mechanism moves in the opening direction;

an external connection terminal connected to the external conductor;

a flexible conductor that is electrically connected between the movable element and the external connection terminal, that is mechanically connected to the link mechanism, and that is deflected by an electromagnetic force generated by energization between the movable element and the external connection terminal, thereby moving the link mechanism in the separation direction;

a trip latch that pulls the movable contact away from the fixed contact;

a release lever that is engaged with the release latch to restrict the operation of releasing the release latch; and

and a trip device which releases the engagement between the trip lever and the trip latch in accordance with the rotation of the main shaft in the 2 nd direction.

2. The circuit breaker of claim 1,

the trip device is provided with a lever which rotates along with the rotation of the main shaft in the 2 nd direction and pushes the trip device to the trip rod.

3. The circuit breaker of claim 2,

the trip device comprises a frame part, an anti-reverse action link which is a component capable of rotating relative to the frame part, and a holding spring which accumulates elastic force through the rotation of the anti-reverse action link,

the lever rotates together with the rotation of the main shaft in the 1 st direction, thereby pressing the reverse operation preventing link in the 1 st direction,

the reverse operation preventing link rotates relative to the frame portion by being pushed in the 1 st direction, and returns to a stable position by an elastic force accumulated by the holding spring if the lever is separated from the reverse operation preventing link.

4. The circuit breaker of claim 3,

the trip device is provided with a trip device connecting rod which moves the trip rod and releases the clamping,

the lever rotates together with the rotation of the spindle in the 2 nd direction, thereby pressing the reverse operation preventing link in the 2 nd direction,

the reverse operation preventing link is pushed in the 2 nd direction, thereby pushing up the trip device link to be close to the trip bar, and if the lever is separated from the reverse operation preventing link, the trip device drops by its own weight, and the reverse operation preventing link returns to the stable position.

5. The circuit breaker of claim 4,

the anti-reverse link does not rotate relative to the frame portion relative to the stable position when pushed in the 2 nd direction.

6. The circuit breaker of any one of claims 2 to 5,

the lever is fixed to the main shaft.

7. The circuit breaker of any one of claims 1 to 6,

the linkage moves in the closing direction in response to rotation of the energy storage arm.

8. The circuit breaker of any one of claims 1 to 7,

a movable member shaft for rotatably supporting the movable member,

the link mechanism is connected to the movable member via the movable member shaft.

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