JP2024008694A - circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circuit breaker which can be downsized and stably perform a rotating operation of a movable contactor.

SOLUTION: A current interruption section corresponding to each phase of a main circuit comprises a long tabular movable contactor 16 with a first movable contact 16d and a second movable contact 16e provided in both ends. In the movable contactor, a power source side spring arrangement space 19 is provided by forming a first recess on one surface in a width direction closer on a side closer to the first movable contact than a shank 16a provided in a central part in a length direction, and a load side spring arrangement space 21 is provided by forming a second recess on the other face in the width direction closer to the second movable contact than the shank. A power source side contact pressure spring 17 is arranged in the power source side spring arrangement space, and both ends of the spring are engaged to the movable contactor and a movable element holder 14. A load side contact pressure spring 18 is arranged in the load side spring arrangement space, and both ends of the spring are engaged to the movable contactor and the movable holder.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a circuit breaker applied to a molded case circuit breaker, an earth leakage circuit breaker, and the like.

A circuit breaker is equipped with an opening/closing mechanism, an overcurrent tripping device, and a current interrupting section. When an overcurrent flows in the main circuit, the opening/closing mechanism starts tripping in response to a command from the overcurrent tripping device, and the current is interrupted. The part performs the opening operation. A circuit breaker is generally a three-phase AC circuit breaker, and three sets of two-point cut-off type current interrupting units corresponding to each phase are built in parallel in the circuit breaker case.

In the two-point cut-off type current interrupter described in Patent Document 1, a power supply side fixed contact, a load side fixed contact, and a movable unit are housed in a case. The movable element unit includes a movable element holder, a movable contact rotatably supported by the movable element holder, and a contact pressure spring composed of a tension coil spring whose both ends are engaged with the movable element holder and the movable contact element. It is equipped with.
The movable contact is a long plate-shaped conductor, and is rotatably supported by the movable element holder at the center position in the longitudinal direction. This movable contact is formed with the same width dimension from one end in the longitudinal direction to the other end, and has a first movable contact at one end in the longitudinal direction that contacts and separates from the power supply side fixed contact of the power supply side fixed contact. A second movable contact that contacts and separates from the load-side fixed contact of the load-side fixed contact is provided at the other end in the longitudinal direction.

The contact pressure spring is a power supply side contact pressure spring that engages with one end side of the movable contact and the movable element holder and applies a biasing force to the movable contact so that contact pressure is applied from the first movable contact to the power supply side fixed contact. and a load-side contact pressure spring that engages with the other end of the movable contact and the movable element holder and applies a biasing force to the movable contact so that contact pressure is applied from the second movable contact to the load-side fixed contact; It is equipped with

Japanese Patent Application Publication No. 2013-97905

By the way, the movable element unit that constitutes the two-point cut-off type current interrupting section of Patent Document 1 has a pair of power supply side contact pressure springs along both sides of the movable contact so as to sandwich the movable contact from the width direction. , and a pair of load-side contact pressure springs are arranged. A movable unit in which a pair of power supply side contact pressure springs and a pair of load side contact pressure springs are arranged on both sides of a movable contactor is a unit with increased widthwise dimension.

In this way, when a current interrupting section having a mover unit with an increased width dimension is incorporated into a circuit breaker, the width dimension of the multiple phase current interrupting sections arranged in parallel increases, resulting in a large circuit breaker. There is a risk.
Furthermore, in the movable unit described in Patent Document 1, when the movable contact rotates, there is a risk that the power supply side contact pressure spring and the load side contact pressure spring arranged on the same side of the movable contact may interfere with each other. However, there is a problem in stable rotational movement of the movable contact.

An object of the present invention is to provide a circuit breaker that can be downsized and that can stably rotate a movable contact.

In order to achieve the above object, a circuit breaker according to one aspect of the present invention incorporates a plurality of two-point cut-off type current interrupting sections corresponding to each phase of the main circuit in parallel in a breaker case. . The current interrupting unit includes a power supply side fixed contact having a power supply side fixed contact, a load side fixed contact having a load side fixed contact, and a second contact that connects and disconnects from the power supply side fixed contact and the load side fixed contact. A long plate-shaped movable contact with a first movable contact and a second movable contact provided at both ends, a movable element holder that rotates the movable contact, and contact pressure is applied from the first movable contact to the power supply side fixed contact. a power-side contact pressure spring that applies a biasing force to the movable contact, and a load-side contact pressure spring that applies a biasing force to the movable contact so that contact pressure is applied from the second movable contact to the load-side fixed contact. , is equipped with. The movable contact is provided with a power supply side spring placement space by forming a first recess on one surface in the width direction on the first movable contact side from the shaft provided in the central part in the longitudinal direction, and A load-side spring arrangement space is provided by forming a second recess in the other widthwise surface on the second movable contact side, and the power-supply side contact pressure spring is arranged in the power-supply spring arrangement space. , both ends of the spring are engaged with the movable contact and the movable element holder, the load-side contact pressure spring is arranged in the load-side spring arrangement space, and both ends of the spring are engaged with the movable contact and the movable element holder. There is.

According to the circuit breaker according to the present invention, size reduction can be achieved by arranging the power supply side contact pressure spring and the load side contact pressure spring so that the width direction dimension of the movable element unit is small, and the power supply side contact pressure spring can be reduced. By eliminating interference between the pressure spring and the load-side contact pressure spring, the movable contact can rotate stably.

FIG. 1 is a schematic configuration diagram showing a circuit breaker including a current interrupting section according to the present invention. FIG. 3 is a diagram showing the internal structure of the current interrupting section according to the first embodiment of the present invention. It is a figure showing the shape of the movable contact which constitutes the electric current cutoff part of a 1st embodiment concerning the present invention, and the arrangement position of the power supply side contact pressure spring and the load side contact pressure spring. It is a figure which shows the shape of the movable contact which comprises the current interruption part of 2nd Embodiment based on this invention, and the arrangement position of the power supply side contact pressure spring and the load side contact pressure spring.

Next, embodiments according to the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar symbols. However, it should be noted that the drawings are schematic and the relationship between thickness and planar dimensions, the ratio of the thickness of each layer, etc. are different from reality. Therefore, the specific thickness and dimensions should be determined with reference to the following explanation. Furthermore, it goes without saying that the drawings include portions with different dimensional relationships and ratios.

In addition, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention. etc. are not specified as those listed below. The technical idea of the present invention can be modified in various ways within the technical scope defined by the claims.
In addition, for terms indicating the directions of "one and the other in the long direction", "one and the other in the short direction", and "one and the other in the width direction" described in the following explanation, refer to the directions of the attached drawings. It is used as

[First embodiment]
FIG. 1 shows a three-phase AC circuit breaker 1 according to a first embodiment of the present invention, which includes an opening/closing handle 2, a toggle type opening/closing mechanism 3, an overcurrent tripping device 4, and a current interrupting part 5. The current interrupting section 5 is installed in parallel in the circuit breaker case corresponding to each phase of the main circuit. The circuit breaker 1 opens and closes the current interrupting section 5 of each phase via the opening/closing mechanism 3 by turning the opening/closing handle 2 ON/OFF.

FIG. 2 shows a detailed structure of the two-point cut-off type current interrupting section 5 of the first embodiment.
The current interrupter 5 includes a interrupter case 8, a power supply side fixed contact 9, a load side fixed contact 10, a mover unit 11, a power supply side arc extinguisher 12, and a load side extinguisher housed in the interrupter case 8. An arc portion 13 is provided.
The movable element unit 11 includes a movable element holder 14, a movable contact 16 rotatably supported by the movable element holder 14, and a tension coil spring whose both ends are engaged with the movable element holder 14 and the movable contact 16. The power supply side contact pressure spring 17 and the load side contact pressure spring 18 are provided.

The movable element holder 14 is a substantially cylindrical insulating member with openings at both ends in the axial direction closed, and is rotatable within the interrupter case 8 by sliding its outer periphery on the curvature inner walls 8a, 8b of the interrupter case 8. is supported by
The power supply side fixed contact 9 is disposed on one side of the cut-off part case 8 in the longitudinal direction, and is a band-shaped conductor that extends in a crank shape from one side to the other in the longitudinal direction. A power supply side terminal (not shown) is connected to one end 9a of the power supply side fixed contact 9 protruding to the outside of the interrupting part case 8, and a fixed contact 9b is connected to the other end of the power supply side fixed contact 9. It is provided.

The load-side fixed contact 10 is disposed on the other side of the interrupter case 8 in the longitudinal direction, and is a flat band-shaped conductor extending in the longitudinal direction. A fixed contact 10a is provided inside the cut-off case 8 of the load-side fixed contact 10, and a load-side terminal (not shown) is provided at the end 10b of the load-side fixed contact 10 located on the outside of the cut-off case 8. ) are connected.
The movable contact 16 is a long conductor, and includes a shaft portion 16a provided at the center in the longitudinal direction, a power supply side movable portion 16b extending from the shaft portion 16a toward the power supply side fixed contact 9 side, and a shaft portion 16b. A load side movable part 16c extending from the part 16a to the load side fixed contact 10 side is provided. A rotating shaft 15 passes through the shaft portion 16a, and the movable contact 16 is rotatably supported by the movable element holder 14 via the rotating shaft 15.

FIG. 3 is a diagram showing the movable contactor 16 of the first embodiment from one side in the short direction. In the power source side movable portion 16b, the first power source side width surface 16b1 on one side in the width direction is formed flush with the first axial width surface 16a1 of the shaft portion 16a, and the second power source side width surface 16b2 on the other side in the width direction is formed flush with the first axial width surface 16a1 of the shaft portion 16a. A stepped portion 16f is formed between the portion 16a and the second shaft width surface 16a2, and extends parallel to the first power supply side width surface 16b1 at a position closer to one side in the width direction. A first movable contact 16d that comes into contact with and separates from the fixed contact 9b of the power supply fixed contactor 9 is formed at the end of the power supply side movable part 16b. The stepped portion 16f is formed obliquely on the other side surface of the movable contactor 16 along the power supply side contact pressure spring 17.

Further, the power source side movable portion 16b is provided with a stepped portion 16f between it and the second shaft width surface 16a2 of the shaft portion 16a, and then a stepped surface extending parallel to the first power source side width surface 16b1 is formed. A spring arrangement space 19 is provided by this stepped surface. An engagement pin 20 that protrudes toward the spring arrangement space 19 is fixed to one end in the short direction of the second power supply side width surface 16b2 (see FIG. 3).

In addition, the load side movable portion 16c has a second load side width surface 16c2 on the other side in the width direction flush with the second shaft width surface 16a2 of the shaft portion 16a, and a first load side width surface 16c1 on the one side in the width direction. A stepped portion 16g is formed between the shaft portion 16a and the first shaft width surface 16a1, and extends parallel to the second load side width surface 16c2 at a position closer to the other side in the width direction. A second movable contact 16e that comes into contact with and separates from the fixed contact 10a of the load-side fixed contact 10 is formed at the end of the load-side movable portion 16c. The stepped portion 16g is formed obliquely on one side surface of the movable contactor 16 along the power supply side contact pressure spring 18.

Further, the load side movable portion 16c is provided with a stepped portion 16g between it and the first shaft width surface 16a1 of the shaft portion 16a, and then a stepped surface extending parallel to the second load side width surface 16c2 is formed. A spring arrangement space 21 is provided by this stepped surface. An engagement pin 22 that protrudes toward the spring arrangement space 19 is fixed to the other end in the short direction of the first load side width surface 16c1 (see FIG. 3).

As shown in FIG. 2, the engagement pin 23 is fixed at a position closer to the other side of the rotary shaft 15 of the movable element holder 14 in the short direction. The power supply side contact pressure spring 17 is arranged with one end engaged with the engagement pin 20 and the other end engaged with the engagement pin 23. As a result, as shown in FIG. 3, substantially the entire area of the power supply side contact pressure spring 17 is arranged in the spring arrangement space 19, and the power supply side contact pressure spring 17 is moved from the first movable contact 16d to the fixed contact 9b. The movable contactor 16 is biased in a tension spring state so that contact pressure is applied.

Furthermore, an engagement pin 24 is fixed at a position closer to one side in the short direction than the rotation axis 15 of the movable element holder 14. The load-side contact pressure spring 18 is arranged with one end engaged with the engagement pin 22 and the other end engaged with the engagement pin 24. As a result, as shown in FIG. 3, the load-side contact pressure spring 18 is arranged with almost the entire area entering the spring arrangement space 21, and the load-side contact pressure spring 18 is moved from the second movable contact 16e to the fixed contact 10a. The movable contact 16 is biased in a tension spring state so that contact pressure is applied.

As shown in FIG. 2, through holes 25a and 25b are formed in the movable element holder 14, and a connecting shaft is connected to these through holes 25a and 25b and a through hole (not shown) formed in the blocking part case 8. (not shown) is inserted. The connection shaft is also inserted into the movable element holder 14 of the current interrupting section 5 of the other phase arranged in parallel.

In the circuit breaker 1 of this embodiment, when an overcurrent flows while the main circuit is energized and the overload tripping device 4 is activated, the tripping operation of the opening/closing mechanism 3 interrupts the current of each phase via the above-mentioned connection shaft. The movable element holder 14 of the movable element unit 11 constituting the section 5 rotates clockwise. Due to the rotation of the movable element holder 14, the first movable contact 16d of the movable contact 16 separates from the fixed contact 9b of the power supply side fixed contact 9 and becomes an open state, and the second movable contact 16e becomes the load side fixed contact. 10 fixed contacts 10a to be in an open state.

Next, the effects of the circuit breaker 1 of this embodiment will be explained.
The movable element unit 11 constituting the two-point cut type current interrupting part 5 of the circuit breaker 1 of this embodiment has a stepped part 16f between the shaft part 16a of the movable contact 16 and the power supply side movable part 16b. By providing this, a spring arrangement space 19 is formed along the second power supply side width surface 16b2, and substantially the entire area of the power supply side contact pressure spring 17 is arranged in this spring arrangement space 19. Further, by providing the stepped portion 16g between the shaft portion 16a of the movable contact 16 and the load side movable portion 16c, a spring placement space 21 is formed along the first load side width surface 16c1, and this spring placement space 21 is formed along the first load side width surface 16c1. The load-side contact pressure spring 18 is disposed such that substantially the entire area thereof is inserted into the space 21 . In the movable element unit 11 of this embodiment, substantially the entire area of the power-side contact pressure spring 17 is arranged in the spring arrangement space 19, and substantially the entire area of the load-side contact pressure spring 18 is arranged in the spring arrangement space 21. Compared to the conventional movable unit (a unit in which a pair of power supply side contact pressure springs and load side contact pressure springs are arranged on both sides of the movable contact so as to sandwich the movable contact from the width direction as explained in the assignment) The dimensions can be designed into smaller units.

As a result, if the three-phase current interrupting section 5 having the mover unit 11 with a small width dimension is installed in parallel inside the circuit breaker 1, the width dimension of the entire device becomes smaller, so the circuit breaker 1 can be made smaller. can be achieved.
In addition, the load side contact pressure spring 18 is disposed on one side of the movable contact 16 in the width direction (the first load side width surface 16c1), and Since the power supply side contact pressure spring 17 is arranged on the width surface 16b2) side, the power supply side contact pressure spring 17 and the load side contact pressure spring 18 do not interfere with each other when the movable contact 16 rotates, and the movable contact Stable rotational movement of the child 16 can be achieved.

[Second embodiment]
Next, FIG. 4 is a diagram showing the shape of a movable contactor 30 according to a second embodiment of the present invention from one side in the short direction. Note that the same components as those shown in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
Like the movable contact 16 of the first embodiment, the movable contact 30 of this embodiment is also an elongated conductor, and includes a shaft portion 30a provided at the center in the longitudinal direction, and a long length extending from the shaft portion 30a. It includes a power supply side movable part 30b extending in one direction, and a load side movable part 30c extending in the other longitudinal direction from the shaft part 30a. A rotating shaft 15 passes through the shaft portion 30a, and a movable contact 16 is rotatably supported by the movable element holder 14 via the rotating shaft 15.

A first movable contact 30d that contacts and separates from the fixed contact 9b of the power source fixed contact 9 is formed at the end of the power source side movable section 30b, and a load side fixed contact 30d is formed at the end of the load side movable section 30c. A second movable contact 30e that comes into contact with and separates from the ten fixed contacts 10a is formed. Here, the straight line indicated by the symbol L1 in FIG. 4 is the center line in the width direction of the movable contactor 30.
In the power source side movable portion 30b of this embodiment, a V-shaped notch portion 31 is formed in a part of the second power source side width surface 30b2 on the other side in the width direction toward the first power source side width surface 30b1. There is. This notch 31 is formed to a depth that intersects the width direction center line L1, and the inner space of this notch 31 is used as a spring arrangement space 32. Furthermore, an engagement pin 20 that protrudes toward the spring arrangement space 32 is fixed to the bottom of the notch 31 .

In the load-side movable portion 30c, a V-shaped notch 33 is formed in a part of the first load-side width surface 30c1 on one side in the width direction toward the second load-side width surface 30c2. This notch 33 is also formed to a depth that intersects the width direction center line L1, and the space inside this notch 33 is used as a spring arrangement space 34. Furthermore, an engagement pin 22 that protrudes toward the spring arrangement space 34 is fixed to the bottom of the notch 33 .

The power supply side contact pressure spring 17 of this embodiment is disposed in a tension spring state, with one end engaging the engagement pin 20 and the other end engaging the engagement pin 23 fixed to the movable element holder 14. As a result, the power supply side contact pressure spring 17 is arranged with substantially the entire area thereof entering the spring arrangement space 32.
Further, the load-side contact pressure spring 18 of this embodiment is disposed in a tension spring state, with one end engaging the engagement pin 22 and the other end engaging the engagement pin 24 fixed to the movable element holder 14. Ru. As a result, the load-side contact pressure spring 18 is arranged such that substantially the entire area thereof enters into the spring arrangement space 34.

Next, the effects of the circuit breaker 1 provided with the movable contactor 30 of this embodiment will be explained.
In the movable element unit 11 including the movable contactor 30 of this embodiment, a spring arrangement space 32 is formed by providing a V-shaped notch 31 in the power supply side movable part 30b. The power supply side contact pressure spring 17 is disposed in a state in which substantially the entire area is inserted. Further, by providing a V-shaped notch 33 in the load side movable part 30c, a spring arrangement space 34 is formed, and the load side contact pressure spring 18 is arranged with almost the entire area inserted into this spring arrangement space 34. be done. In the movable element unit 11 of this embodiment, substantially the entire area of the power-side contact pressure spring 17 is arranged in the spring arrangement space 32 of the movable contact 30, and substantially the entire area of the load-side contact pressure spring 18 is arranged in the spring arrangement space 34. Because of this, it is possible to design a unit with a smaller width dimension compared to the conventional mover unit, and the three-phase current interrupting section 5 having this mover unit 11 can be connected in parallel inside the circuit breaker 1. When incorporated, the width of the entire device becomes smaller, so the circuit breaker 1 can be made smaller.

In addition, the load side contact pressure spring 18 is disposed on one side of the movable contact 30 in the width direction (first load side width surface 30c1), and the load side contact pressure spring 18 is arranged on the side of the movable contact 30 on the opposite side in the width direction (second power supply side). Since the power supply side contact pressure spring 17 is arranged on the width surface 30b2) side, the power supply side contact pressure spring 17 and the load side contact pressure spring 18 do not interfere with each other when the movable contact 30 rotates, and the movable contact Stable rotational movement of the child 16 can be achieved.

Furthermore, since the notch 31 of the power supply side movable part 30b and the notch 33 of the load side movable part 30c are provided so as to intersect with the widthwise center line L1 of the movable contactor 30, the spring arrangement space 32 is The arranged power supply side contact pressure spring 17 generates a biasing force on the movable contact 30 near the center position in the width direction of the movable contact 30, and the load side contact pressure spring 18 arranged in the spring arrangement space 34 causes the movable contact 30 to be biased. A biasing force is generated on the movable contact 30 near the center position in the width direction. As a result, the power supply side contact pressure spring 17 and the load side contact pressure spring 18 do not apply a rotational force about the width direction center line L1 to the movable contact 30, and the first movable contact 30d is connected to the power supply side fixed contact. The second movable contact 30e can apply an optimal contact pressure to the fixed contact 10a of the load-side fixed contact 10.

1 Circuit breaker 2 Opening/closing handle 3 Opening/closing mechanism 4 Overcurrent tripping device 5 Current interrupting part 8 Breaking part cases 8a, 8b Curvature inner wall 9 Power side fixed contact 9b Fixed contact 10 Load side fixed contact 10a Fixed contact 11 Mover Unit 12 Power supply side arc extinguishing part 13 Load side arc extinguishing part 14 Movable element holder 15 Rotating shaft 16 Movable contact 16a Shaft part 16a1 First shaft width surface 16a2 Second shaft width surface 16b Power supply side movable part 16b1 First power supply side width surface 16b2 2 power supply side width surface 16c Load side movable part 16c1 1st load side width surface 16c2 2nd load side width surface 16d 1st movable contact 16e 2nd movable contact 16f, 16g Stepped portion 17 Power supply side contact pressure spring 18 Load side contact pressure spring 19 Spring placement space (power supply side spring placement space)
21 Spring arrangement space (load side spring arrangement space)
20, 22, 23, 24 Engagement pins 25a, 25b Through hole 30 Movable contact 30a Shaft portion 30a
30b Power side movable portion 30b1 First power source side width surface 30b2 Second power source side width surface 30c Load side movable portion 30c1 First load side width surface 30c2 Second load side width surface 30d First movable contact 30e Second movable contact 31 Notch portion (first 1 notch)
32 Spring arrangement space (power supply side spring arrangement space)
33 Notch part (second notch part)
34 Spring arrangement space (power supply side spring arrangement space)

Claims (4)

In a circuit breaker in which multiple two-point cut-off type current interrupting sections corresponding to each phase of the main circuit are built in parallel in the breaker case,
The current interrupting unit has a power supply side fixed contact having a power supply side fixed contact, a load side fixed contact having a load side fixed contact, and a power supply side fixed contact having a load side fixed contact connected to the power supply side fixed contact and the load side fixed contact in the interrupting unit case. a long plate-shaped movable contact provided at both ends with a first movable contact and a second movable contact to be separated; a movable element holder that rotates the movable contact; and a fixed part from the first movable contact to the power supply side. a power supply side contact pressure spring that applies a biasing force to the movable contact so that contact pressure is applied to the contact; and a biasing force that applies a biasing force to the movable contact so that contact pressure is applied from the second movable contact to the load side fixed contact. and a load-side contact pressure spring that acts on the
In the movable contact, a power supply side spring arrangement space is provided by forming a first recess on one surface in the width direction on the side of the first movable contact from a shaft portion provided at a central portion in the longitudinal direction; A load-side spring arrangement space is provided by forming a second recess on the other surface in the width direction closer to the second movable contact than the shaft;
The power supply side contact pressure spring is arranged in the power supply side spring arrangement space, and both ends of the spring are engaged with the movable contact and the movable element holder,
The circuit breaker is characterized in that the load-side contact pressure spring is arranged in the load-side spring arrangement space, and both ends of the spring are engaged with the movable contact and the movable element holder. The first recess is provided with a stepped portion from one side in the width direction of the shaft portion to form a stepped surface extending toward the first movable contact, and the stepped surface provides a space for arranging the power supply side spring. It is provided,
The second recess is provided with a stepped portion from the other widthwise side surface of the shaft portion to form a stepped surface extending toward the second movable contact, and the stepped surface extends the load-side spring arrangement space. A circuit breaker according to claim 1, characterized in that it is provided. The first recess is a first notch formed in a part of one side in the width direction on the side of the first movable contact from the shaft, and the first notch allows the power supply side spring placement space to be closed. is provided,
The second recess is a second notch formed in a part of the other side surface in the width direction on the side of the second movable contact from the shaft, and the second notch allows the power supply side spring placement space to be closed. The circuit breaker according to claim 1, further comprising: a. 4. The circuit breaker according to claim 3, wherein the first notch and the second notch are formed to a depth that intersects a center line in the width direction of the movable contact.

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