JPWO2015151394A1 - Breaker - Google Patents

Abstract

The circuit breaker includes a fixed terminal having a fixed contact, a movable terminal having a movable contact for contact with and separating from the fixed contact by an opening / closing operation, a movable side traveling unit, a fixed side commutation unit, a grid, One side plate and two rib blocks. The movable side traveling unit is electrically connected to the movable terminal. The fixed side commutation part is electrically connected to the fixed terminal. The grid is disposed between the movable side traveling unit and the fixed side commutation unit. Each of the two rib blocks is formed with a plurality of ribs extending from the fixed contact toward the grid. The two rib blocks are arranged with a plurality of ribs facing each other. The two side plates sandwich the two rib blocks. Each one of the two rib blocks is attached to each of the two side plates so as to be detachable.

Description

  The present invention relates to a circuit breaker.

  In general, in indoor wiring at home, a circuit breaker is installed between the commercial power supply and the indoor wiring to prevent damage to the indoor wiring due to overcurrent or electrical equipment connected to the tip of the indoor wiring. Yes. The circuit breaker has a contact for opening and closing the electric circuit, and when an overcurrent flows through the circuit breaker, the contact is opened to interrupt the electric circuit. In a circuit breaker, when a contact is opened by manual operation or overcurrent detection, an arc is generated between the contacts. The circuit breaker has a extinguishing arc portion that quickly extinguishes the arc (for example, Patent Documents 1 to 5).

Japanese Examined Patent Publication No. 62-58094 JP 2002-352692 A JP 56-69744 A JP-A-60-230321 Japanese Patent Laid-Open No. 03-266328

  A circuit breaker according to the present invention includes a fixed terminal having a fixed contact, a movable terminal having a movable contact for making contact with and separating from the fixed contact by an opening / closing operation, a movable side traveling unit, a fixed side commutation unit, and a grid And two side plates and two rib blocks. The movable side traveling unit is electrically connected to the movable terminal. The fixed side commutation part is electrically connected to the fixed terminal. The grid is disposed between the movable side traveling unit and the fixed side commutation unit. Each of the two rib blocks is formed with a plurality of ribs extending from the fixed contact toward the grid. The two rib blocks are arranged with a plurality of ribs facing each other. The two side plates sandwich the two rib blocks. Each one of the two rib blocks is attached to each of the two side plates so as to be detachable.

  With the above configuration, in the circuit breaker according to the present invention, an increase in arc voltage can be promoted, and the arc current limiting performance of the arc current can be improved.

1 is an internal side view of a circuit breaker according to a first embodiment of the present invention. FIG. 2A is a perspective view of a rib block in the circuit breaker of FIG. FIG. 2B is an internal side view showing a state where the rib block is removed from the circuit breaker of FIG. 1. FIG. 3A is a diagram illustrating a state in which an arc in the circuit breaker of FIG. 1 has transitioned between the fixed-side traveling unit and the movable-side traveling unit. FIG. 3B is a diagram illustrating a state in which the arc in the circuit breaker of FIG. 1 has shifted between the fixed-side commutation unit and the movable-side traveling unit. FIG. 4 is an explanatory diagram showing temporal transition of arc current and arc voltage in the circuit breaker of FIG. FIG. 5 is a perspective view of a rib block in the circuit breaker according to the second embodiment of the present invention. FIG. 6 is a perspective view of a rib block in the circuit breaker according to the third embodiment of the present invention. FIG. 7 is an internal side view of a conventional circuit breaker. It is a figure which shows the state which the arc in the circuit breaker of FIG. 7 shifted between the fixed side traveling part and the movable side traveling part. It is a figure which shows the state which the arc in the circuit breaker of FIG. 7 moved between the fixed side commutation part and the movable side traveling part. It is a figure which shows the time transition of the arc current and arc voltage in the circuit breaker of FIG.

  Prior to the description of the embodiment of the present invention, problems in the prior art circuit breaker 200 will be described.

  FIG. 7 is an internal side view of the circuit breaker 200, and FIG. 8A is a diagram illustrating a state in which the arc in the circuit breaker 200 has shifted between the fixed side traveling unit 116 and the movable side traveling unit 118, and FIG. FIG. 6 is a diagram showing a state where an arc in the circuit breaker 200 has shifted between a fixed-side commutation portion 119 and a movable-side traveling portion 118. 7, 8 </ b> A, and 8 </ b> B are states in which the fixed contact 113 and the movable contact 115 are separated from each other.

  When the movable contact 115 is separated from the fixed contact 113, an arc is generated between the fixed contact 113 and the movable contact 115. High temperature gas is generated due to the arc. The high temperature gas becomes a high temperature gas flow F and is guided from the generation point toward the grid 117 by the plurality of ribs 123 provided on the side plate 122. The grid 117 is composed of a plurality of stacked iron plates and has a function of inducing an arc. When the arc is guided to the grid 117, the arc moves between the tip 116 a of the fixed side traveling unit 116 electrically connected to the fixed contact 113 and the movable side traveling unit 118, and becomes an arc A <b> 1. When the hot gas moves to the grid 117, the arc A1 is cooled, and the electric path of the arc A1 is increased in resistance. Therefore, the arc A1 moves between the movable side traveling unit 117 and the fixed side commutation unit 119 that is electrically connected to the fixed side traveling unit 116, and becomes an arc A2. As a result, since the arc current is limited by the increase in arc voltage, the arc A2 disappears.

  In the circuit breaker 200, a plurality of curved ribs 123 extending from the fixed contact 113 toward the grid 117 are arranged at substantially equal intervals. The rib tip 123b of the rib 123 extends toward the grid 117. However, the rib 123 is not arranged at the place where the fixed side traveling unit 116 is arranged. That is, the rib 123 extending from the intermediate portion 17M of the grid 117 to the fixed-side commutation portion 119 (upper portion of the grid 117) is not formed. Therefore, as shown in FIG. 8A, most of the hot gas flow F is guided by the rib 123 from the intermediate portion 17M of the grid 117 to the range of the movable side traveling portion 118 (lower portion of the grid 117).

  For this reason, the arc A1 is less likely to move from the fixed-side traveling unit 116 to the fixed-side commutation unit 119, and tends to stay between the movable-side traveling unit 118 and the fixed-side traveling unit 116.

  FIG. 9 shows the time transition of the arc voltage and arc current in the circuit breaker 200. The retention of the arc A1 prevents the increase of the arc voltage Va2 in the initial generation of the arc (3 msec to 4 msec), so that the arc current limiting performance of the arc current Ia2 is reduced. That is, the current value ΔIa2 that decreases after reaching the peak in the arc current Ia2 may be insufficient.

  On the other hand, in a circuit breaker that does not require high arc current limiting performance, the rib 123 may not be required.

  Hereinafter, the circuit breaker concerning one mode of the present invention is explained, referring to drawings. Note that each of the embodiments described below shows a preferred specific example. Among the constituent elements in the embodiment, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are described as optional constituent elements. Accordingly, numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and do not limit the present disclosure.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. In each figure, substantially the same structure is denoted by the same reference numeral, and redundant description is omitted or simplified.

(Embodiment 1)
Hereinafter, the circuit breaker 100 according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is an internal side view of the circuit breaker 100.

  FIG. 2A is a perspective view of the rib block 23 in the circuit breaker 100. FIG. 2B is an internal side view showing the circuit breaker 100 with the rib block 23 removed. FIG. 3A is a diagram illustrating a state in which the arc in the circuit breaker 100 has shifted between the fixed side traveling unit 16 and the movable side traveling unit 18. FIG. 3B is a diagram illustrating a state in which the arc in the circuit breaker 100 has shifted between the fixed-side commutation unit 19 and the movable-side traveling unit 18. FIG. 4 is an explanatory diagram showing the time transition of the arc current and arc voltage in the circuit breaker 100. 1, 2 </ b> B, 3 </ b> A, and 3 </ b> B are states in which the fixed contact 13 and the movable contact 15 are separated from each other.

  The circuit breaker 100 has a fixed terminal 12 having a fixed contact 13 and a movable terminal 14 having a movable contact 15 for making contact with and separating from the fixed contact 13 by an opening / closing operation. The fixed contact 13 and the movable contact 15 are arranged to face each other. The fixed terminal 12 is fixed to the case 11, and the movable terminal 14 is supported by the case 11 so as to rotate with respect to the case 11. Both the fixed terminal 12 and the movable terminal 14 are made of metal processed into a plate shape.

  The fixed terminal 12 and the movable terminal 14 are interposed in wiring from a commercial power source. If the fixed contact 13 and the movable contact 15 are separated by the rotation of the movable terminal 14, the electric path from the commercial power source is interrupted.

  In the circuit breaker 100, the fixed-side traveling unit 16 is curved in a direction away from the movable terminal 14 and extends from the fixed terminal 12. The fixed terminal 12 having the fixed contact 13 and the fixed side traveling portion 16 are metal plate materials, are integrally formed, and are electrically connected.

  The circuit breaker 100 further has an arc extinguishing part. The arc extinguishing part includes a grid 17, a movable side traveling part 18, a fixed side commutation part 19, and two side plates 22. The grid 17 is formed by laminating a plurality of iron plates 17a via gaps 17b. The movable side traveling unit 18 is disposed on one end side of the grid 17 in the stacking direction. The fixed side traveling unit 16 is disposed on the other end side of the grid 17 in the stacking direction. The two side plates 22 are arranged with a space between the fixed side traveling unit 16 and the movable side traveling unit 18 interposed therebetween. There are gaps between the grid 17 and the movable side traveling part 18 and the fixed side commutation part 19.

  The movable side traveling unit 18 is electrically connected to the movable terminal 14. The fixed commutation part 19 is electrically connected to the fixed terminal 12. The grid 17 is disposed between the movable side traveling unit 18 and the fixed side commutation unit 19. The distal end portion 16 a of the fixed side traveling portion 16 is disposed at a position facing the grid 17. The fixed-side commutation unit 19 is disposed at a position farther from the movable-side traveling unit 18 than the fixed-side traveling unit 16. Both the movable side traveling part 18 and the fixed side commutation part 19 are made of metal processed into a plate shape.

  The circuit breaker 100 has two side plates 22 that sandwich a space 30 formed between the fixed side traveling unit 16 and the movable side traveling unit 18. Two rib blocks 23 are arranged in the space 30. Further, the fixed terminal 12 formed integrally with the fixed-side traveling unit 16 is also sandwiched between the two side plates 22. In FIG. 1, one side plate 22 and a rib block 23 are drawn, and the other side plate (not shown) and the rib block (not shown) are arranged in front of the page. Each of the two rib blocks 23 has a shape symmetrical with respect to the paper surface. The side plate 22 is formed of a synthetic resin, and is integrally formed with the case 11 formed of the same synthetic resin. A rib block 23 is attached to the side plate 22 so as to be attached and detached. In the present embodiment, the side plate 22 is formed with a recess 31 for attaching and detaching the rib block 23. The rib block 23 is fitted in the recess 31. The structure which attaches the rib block 23 to the side plate 22 may be other than this. For example, the rib block 23 and the side plate 22 may be screwed.

  The rib block 23 is formed with a plurality of ribs 23 a to 23 d extending from the fixed contact 13 toward the grid 17. Among the plurality of ribs 23a to 23d, the rib 23a closest to the fixed traveling portion 16 extends toward the fixed-side commutation portion 19, and the rib 23d closest to the movable-side traveling portion 18 is the intermediate portion 17M of the grid 17. And extending between the movable side traveling unit 18. Each of the two rib blocks 23 is disposed in the space 30 with the plurality of ribs 23a to 23d facing each other. In the two rib blocks 23, the ribs 23 a to 23 d arranged to face each other are not in contact with each other. That is, there is a gap between each of the opposing ribs 23a to 23d. The rib block 23 is made of a synthetic resin. The synthetic resin used for the rib block 23 may be a synthetic resin used for the side plate 22.

  In the circuit breaker 100, an arc is generated when the fixed contact 13 and the movable contact 15 are separated. As shown in FIG. 3A, the high temperature gas generated due to the arc becomes a high temperature gas flow F1 to F3 and is guided toward the grid 17 from the fixed contact 13 and the movable contact 15 by the ribs 23a to 23d. The high-temperature gas that has reached the grid 17 flows into the gap 17b of the iron plate 17a constituting the grid 17, flows along the iron plate 17a, and is discharged to the outside from the exhaust port 29.

  As shown in FIG. 2A, the ribs 23 a to 23 d are formed to be curved so as to surround the fixed terminal 12 and the fixed-side traveling unit 16. One end of the ribs 23a to 23d is a rib base end 23a1 to 23d1, and the other end is a rib tip 23a2 to 23d2. The rib base end portions 23a1 to 23d1 are arranged at equal intervals. The ribs 23a to 23d are formed so that the interval between the adjacent ribs 23a to 23d gradually increases from the rib base end portions 23a1 to 23d1 toward the rib distal end portions 23a2 to 23d2. That is, the interval at the rib tip end portions 23a2 to 23d2 that are the rib end portions close to the grid 17 is wider than the interval at the rib base end portions 23a1 to 23d1 that are the rib end portions close to the fixed contact 13.

  The rib 23 a closest to the fixed-side traveling unit 16 extends toward the fixed-side commutation unit 19. That is, the rib 23 a extends from the fixed-side commutation portion 19 toward the nearest iron plate 17 a in the grid 17.

  The rib 23b adjacent to the rib 23a extends from the intermediate portion 17M of the grid 17 toward the iron plate 17a closer to the fixed-side commutation portion 19. Further, the rib 23 c adjacent to the rib 23 b extends toward the iron plate 17 a in the intermediate portion 17 </ b> M of the grid 17. The rib 23d adjacent to the rib 23c extends from the intermediate portion 17M of the grid 17 toward the iron plate 17a closer to the movable side traveling portion 18. Therefore, the rib front end portions 23a2 to 23d2 are formed by sequentially changing the direction from the fixed side commutation portion 19 toward the movable side traveling portion 18.

  With this configuration, the high-temperature gas flows F <b> 1 to F <b> 3 that flow toward the grid 17 from between the two adjacent ribs among the ribs 23 a to 23 d flow evenly over the entire grid 17.

  Next, the operation of the circuit breaker 100 will be described.

  In the circuit breaker 100, when the movable contact 15 is separated from the fixed contact 13 by rotating the movable terminal 14, the electric circuit interposed in the circuit breaker 100 is interrupted.

  Then, an arc is generated between the fixed contact 13 and the movable contact 15. As shown in FIG. 3A, the arc attached / detached from the fixed contact 13 and the movable contact 15 is guided to the grid 17 and moves between the fixed traveling unit 16 and the movable traveling unit 18 to become an arc A1. .

  At this time, due to the high-temperature gas flows F1 to F3 guided by the ribs 23a to 23d, the end A1a close to the fixed-side traveling portion 16 of the arc A1 is transferred to the fixed-side commutation portion 19, and the movable-side traveling portion of the arc A1. As shown in FIG. 3B, the end A1b close to 18 moves below the grid 17 to become an arc A2.

  As shown in FIG. 4, the rise of the arc voltage Va1 is promoted by the cooling action of the grid 17 and the high-temperature gas, and the arc current Ia1 is suppressed. As a result, the current value ΔIa1 that decreases after a predetermined time from reaching the peak value in the arc current Ia1 becomes larger than the current value ΔIa2 shown in FIG. As a result, the arc current limiting performance of the circuit breaker 100 is improved. That is, in the circuit breaker 100, the arc can be reliably extinguished.

  With the circuit breaker 100, the following effects can be obtained.

  (1) When the fixed contact 13 and the movable contact 15 are separated in a state in which the rib block 23 is fitted in the recess 31, the circuit breaker 100 causes the arc to be fixed to the fixed-side commutation portion by the action of the ribs 23a to 23d. 19 and the movable side traveling part 18 can be shifted. As a result, an increase in arc voltage can be promoted by the action of the grid 17 and the arc current limiting performance of the circuit breaker 100 can be improved.

  (2) When it is not necessary to ensure the arc current limiting performance, the rib block 23 can be used without being assembled. Therefore, by selecting whether or not the rib block 23 is assembled, two types of circuit breakers having different arc current limiting performance can be configured.

  (3) Therefore, parts can be shared and cost can be reduced.

(Embodiment 2)
The rib block 24 included in the circuit breaker according to Embodiment 2 of the present invention will be described with reference to FIG. The rib block 24 has a rib connecting portion 241 at an end portion (base end portion) near the fixed contact of the plurality of ribs 24a to 24d. Other configurations are the same as those of the rib block 23. Therefore, in the circuit breaker 100 according to the first embodiment, the rib block 24 can be attached instead of the rib block 23.

  The rib connecting portion 241 connects the base end portions 24a1 to 24d1 of the adjacent ribs 24a to 24d. With this configuration, as shown in FIG. 5, warping in the X direction is prevented by the ribs 24 a to 24 d, and warping in the Y direction is prevented by the rib connecting portion 241.

  Therefore, in the second embodiment, in addition to the effects obtained in the first embodiment, the rib block 24 can be prevented from warping due to the heat generated by the arc.

(Embodiment 3)
A rib block 25 included in a circuit breaker according to Embodiment 3 of the present invention will be described with reference to FIG. The rib block 25 has a first surface 251 on which a plurality of ribs including ribs 25 a are formed, a first surface 251, and a second surface 252 facing away from the first surface 251, and has a flange 253 around the second surface 252. . That is, the second surface 252 is surrounded by the flange portion 253. Other configurations are the same as those of the rib block 23 or the rib block 24. Therefore, in the circuit breaker 100 according to the first embodiment, the rib block 25 can be attached instead of the rib block 23.

  The height of the flange 253 is constant with respect to the second surface 252. That is, a rib recess 254 is formed inside the flange 253.

  With this configuration, warping of the rib block 25 can be prevented as in the second embodiment.

  In the rib block 25, a magnetic plate 27 such as an iron plate may be accommodated in the rib recess 254. That is, the rib block 25 in which the magnetic plate 27 is accommodated in the rib recess 254 may be fitted into the recess 30. With this configuration, the arc can be reliably moved between the distal end portion 16 a of the fixed side traveling unit 16 and the movable side traveling unit 18 via the surface of the rib block 25.

  In the circuit breaker according to the present embodiment, it is possible to select a specification in which the magnetic plate 27 is attached to the rib block 25 and a specification in which the magnetic plate 27 is removed. That is, it becomes possible to share components in circuit breakers with different specifications.

  As described above, the first to third embodiments may be modified as follows.

  You may provide the rib part 253 provided in the rib block 25 of Embodiment 3 in the rib block 24 of Embodiment 2. FIG.

12 fixed terminal 13 fixed contact 14 movable terminal 15 movable contact 16 fixed side traveling part 17 grid 17M intermediate part 18 movable side traveling part 19 fixed side commutation part 22 side plates 23, 24, 25 rib blocks 23a-23d, 24a-24d, 25a-253d rib 241 rib connecting portion 253 flange 254 rib recess 27 magnetic plate

Claims (6)

A fixed terminal having a fixed contact;
A movable terminal having a movable contact for making contact with and separating from the fixed contact by an opening and closing operation;
A movable side traveling unit electrically connected to the movable terminal;
A fixed-side commutation portion electrically connected to the fixed terminal;
A grid disposed between the movable side traveling part and the fixed side commutation part;
A plurality of ribs extending from the fixed contact toward the grid, and two rib blocks arranged with the plurality of ribs facing each other;
Two side plates sandwiching the two rib blocks, and
Each one of the two rib blocks is detachably attached to each of the two side plates.
Circuit breaker. The circuit breaker according to claim 1, wherein each of the two rib blocks has a rib connecting portion at an end portion of the plurality of ribs close to the fixed contact. Each of the two rib blocks has a first surface on which the plurality of ribs are formed and a second surface facing away from the first surface, and has a flange on a peripheral portion of the second surface. Item 3. The circuit breaker according to item 1 or 2. The circuit breaker according to claim 3, wherein each of the two rib blocks has a magnetic plate that can be attached to and detached from the inside of the flange. In the plurality of ribs of each of the two rib blocks, the rib closest to the fixed traveling portion extends toward the fixed-side commutation portion, and the rib closest to the movable-side traveling portion is The circuit breaker as described in any one of Claim 1 to 4 extended toward between the intermediate part of a grid, and the said movable side traveling part. The rib adjacent to each other in the plurality of ribs of each of the two rib blocks has a wider interval at the end near the grid than at the end near the fixed contact. Breaker according to item.

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