JP2017174699A - Circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of dielectric breakdown between terminal sections due to insulation deterioration caused by arc gas discharged from an exhaust port of an adjacent terminal section.SOLUTION: A circuit breaker 1 includes a plurality of terminal sections 9 each including a terminal 3. Each of the terminal sections 9 includes an exhaust port 5 capable of discharging arc gas, the exhaust port 5 being formed such that the position of the front and rear direction of the exhaust port 5 is different from the position of the front and rear direction of an adjacent exhaust port 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a circuit breaker.

  Conventionally, a circuit breaker capable of interrupting the flow of current has been used. Since the circuit breaker may generate arc gas when the contact is released or short-circuited, it is known to provide an exhaust port for exhausting the arc gas. A plurality of the exhaust ports are provided adjacent to each of the terminal portions. For example, Patent Document 1 describes a circuit breaker in which terminal portions are formed side by side in the left-right direction, and an exhaust port is formed above each terminal portion.

  Patent Document 2 describes a circuit breaker in which terminal portions are formed side by side in the left-right direction, and exhaust ports are provided on both the upper and lower portions of each terminal portion. The technique described in Patent Document 2 focuses on rapidly discharging arc gas out of the casing.

JP 2009-043517 A JP 2005-158751 A

  By the way, there is a possibility that the insulating performance at the periphery of the exhaust port may deteriorate due to adhesion of components in the arc gas discharged from the exhaust port. There is a possibility that the insulation of the adjacent terminal portion may be broken due to adhesion of components in the arc gas around the adjacent exhaust port. Such a situation can be avoided by securing a distance between adjacent terminal portions. However, as a recent trend, it is required to reduce the size of the circuit breaker. If the width | variety of a circuit breaker is shortened along this request, it will become difficult to ensure the distance between terminal parts.

  The inventor of the present case tried to solve the problem by diligently examining this point. The subject of this invention is suppressing generation | occurrence | production of the dielectric breakdown between terminal parts by the insulation deterioration resulting from the arc gas discharged | emitted from the exhaust port of an adjacent terminal part.

  In order to solve the above problems, the following means are adopted. The first means includes a plurality of terminal portions each having a terminal to which wiring is connected, each terminal portion including an exhaust port capable of discharging arc gas, and the vertical position of the exhaust port is adjacent to the exhaust port. The circuit breakers are formed differently at the mouth. In addition, in this specification, the back side of a circuit breaker is made into the lower side, and the surface side is made into the upper side.

  In the first means, it is preferable that the second means has a configuration in which positions of the exhaust ports in the depth direction are different from each other at adjacent exhaust ports.

  In the first or second means, a third means having a configuration in which one of the exhaust ports is provided on the upper side of the terminal and an adjacent exhaust port is provided on the lower side of the terminal is preferable.

  In the first to third means, it is preferable that the fourth means has a configuration in which the vertical positions of the terminals are different from each other at adjacent terminals.

  In the first means, the vertical positions of the exhaust ports are formed to be different from each other at adjacent exhaust ports. Therefore, even if the periphery of the exhaust port is exposed to the arc gas, it is possible to maintain insulation between the terminals.

  In the second means, in addition to the first means, the positions of the exhaust ports in the depth direction are different from each other at the adjacent exhaust ports. Therefore, even if the periphery of the exhaust port is exposed to the arc gas, it is possible to further maintain insulation between the terminals.

  In the third means, one of the exhaust ports is provided on the upper side of the terminal, and the adjacent exhaust port is provided on the lower side of the terminal. Therefore, since the distance between the adjacent exhaust ports is increased, the insulation between the terminals can be further maintained.

  In the fourth means, the vertical positions of the terminals are formed so as to be different from each other at adjacent terminals. Therefore, the distance between the terminals can be secured, and the insulation between the terminals can be further maintained.

It is a perspective view of the circuit breaker of an embodiment. It is the elements on larger scale which expanded the exhaust port periphery in FIG. It is a disassembled perspective view of the circuit breaker of embodiment. It is a perspective view of a circuit breaker provided with a dust barrier. It is a perspective view of an internal mechanism part. It is the perspective view which looked at the internal mechanism part from the direction different from FIG. It is the side view which showed the cross section of the center terminal part. It is the side view which showed the cross section of the terminal part of the left side. It is the perspective view which showed the cross section of the center terminal part. It is the perspective view which showed the cross section of the terminal part on the left side.

  The form for implementing this invention is shown below. FIG. 1 is a perspective view of a circuit breaker 1 according to an embodiment. FIG. 2 is a partially enlarged view in which the periphery of the exhaust port 5 in FIG. 1 is enlarged. In FIG. 1 and the like, an arrow with X adjacent to it indicates the depth direction. An arrow with Y adjacent to it points upward. As shown in FIG. 1, the circuit breaker 1 of this Embodiment is provided with the some terminal. The terminal includes a power supply side terminal to which a power supply is connected and a load side terminal to be connected to the device. FIG. 1 shows a power supply side terminal 3 (hereinafter, terminal 3). Terminals 3 are formed at both ends of the circuit breaker 1. Moreover, as shown in FIG. 2, the circuit breaker 1 of this Embodiment is provided with the partition 7 which ensures the insulation distance between different poles. The partition wall 7 is formed so as to be positioned between adjacent terminals 3. Three terminals 3 of the present embodiment are formed, and two partition walls 7 are formed so as to separate adjacent terminals 3.

  In the vicinity of the terminal 3, an exhaust port 5 that can discharge the arc gas generated inside the circuit breaker 1 to the outside is formed. The exhaust ports 5 are respectively provided corresponding to the terminal portions 9 that are regions of the terminals 3 partitioned by the partition walls 7. In the present embodiment, one terminal portion 9 includes one terminal 3 and one exhaust port 5.

  The circuit breaker 1 includes a handle 11, and the handle 11 can open and close the circuit. The surface on which the handle 11 can be operated is a surface. A back surface 19 which is a surface opposite to the front surface is an attachment surface. FIG. 3 is an exploded perspective view of the circuit breaker 1 according to the embodiment. The circuit breaker 1 according to the present embodiment includes an internal mechanism unit 15 that enables opening and closing operations of a movable contact 12 described later by a handle operation. The internal mechanism portion 15 is fixed to the intermediate base 16. A cover 17 is attached so as to cover the intermediate base 16. A base 18 is attached to the back side of the intermediate base 16. The base 18 is a part that contacts the part to which the circuit breaker 1 is attached.

  In addition, the dust barrier 22 which suppresses that the dust etc. penetrate | invade into the inside of the circuit breaker 1 is normally attached to the terminal 3 on the left-right side of the circuit breaker 1 of this Embodiment. As shown in FIG. 4, the dust barrier 22 is disposed so as to cover a part of the exhaust ports 5. The dust barrier 22 can be bent, and has a configuration that can both suppress the intrusion of dust into the circuit breaker 1 and discharge the arc gas to the outside of the circuit breaker 1.

  FIG. 5 is a perspective view of the internal mechanism portion 15. FIG. 6 is a perspective view of the internal mechanism 15 as seen from a direction different from that in FIG. FIG. 7 is a side view showing a cross section of the central terminal portion 9a. FIG. 8 is a side view showing a cross section of the terminal portion 9b on the left and right sides. Each dust barrier 22 is omitted. The circuit breaker 1 moves the movable contact 12 when the circuit is switched from a closed state to an open state by a handle operation. More specifically, the movable contact 12 is moved so that the movable contact 12 and the fixed contact 13 are separated from the state in which the movable contact 12 and the fixed contact 13 are in contact with each other. In addition, when an overcurrent exceeding the rated current continues to flow through the circuit breaker 1 or when a short circuit accident occurs, the internal mechanism unit 15 operates from a state in which the circuit breaker 1 is closed, and the movable contact is forced. The child 12 is pulled away from the fixed contact 13 (trip operation). At this time, arc gas accompanying arc discharge is generated when the movable contact 12a of the movable contact 12 and the fixed contact 13a of the fixed contact 13 are detached. The generation source is in the vicinity of each contact 12a, 13a where the movable contact 12 and the fixed contact 13 contact. An arc extinguishing device 23 that extinguishes arc discharge is provided between the contact point and the exhaust port 5. In the arc extinguishing device 23 of the present embodiment, plate-like parts are arranged in the vertical direction. The circuit breaker 1 according to the present embodiment is configured such that arc gas can be discharged from the exhaust port 5 via the arc extinguishing device 23 as indicated by the broken line arrows in FIGS. 7 and 8. .

  The circuit breaker 1 of the present embodiment is formed such that the vertical positions of the exhaust ports 5 are different from each other at the adjacent exhaust ports 5. That is, the exhaust ports 5 belonging to the terminals 3 that are adjacent in the left-right direction have different distances from the mounting surface S that contacts the back surface 19 to the exhaust ports 5 during installation. In the present embodiment, among the three terminal portions 9, the distance between the exhaust port 5a and the mounting surface S in the terminal portion 9a located at the center is formed to be the shortest. Further, although the distance between the exhaust port 5b and the mounting surface S in the terminal portion 9b located on the left and right sides is the same, the terminal portion 9a located in the center is located between the terminal portions 9b located on the left and right sides. The distance between the exhaust ports 5 is ensured. In this specification, the terminal portions 9a and 9b are arranged substantially in parallel, and the terminal portion 9a located at the center and the terminal portion 9b located on the left and right sides are referred to as adjacent terminal portions 9. Further, when comparing the exhaust port 5a formed in one terminal portion 9a of the adjacent terminal portion 9 and the exhaust port 5b formed in the other terminal portion 9b, the exhaust ports 5a and 5b are adjacent to each other. This is called the exhaust port 5.

  By making the distance from the mounting surface S of the exhaust port 5 formed in the adjacent terminal part 9 different, it is suppressed that the distance between the adjacent exhaust ports 5 becomes short. Thus, even if the periphery of the exhaust port 5 is exposed to the arc gas, the height of the exhaust port 5 of the adjacent pole is different, so that both surfaces of the partition wall 7 are not exposed to the arc gas, the insulation is not deteriorated, and the terminals 3 It is easy to keep the insulation. Moreover, in this Embodiment, the position of the depth direction of the exhaust port 5 is formed so that it may mutually differ in the adjacent exhaust port 5. FIG. For this reason, since the distance between the exhaust ports 5 of the adjacent terminal portions 9 becomes longer, it becomes easier to maintain insulation between the terminals 3.

  One of the exhaust ports 5 of the circuit breaker 1 according to the present embodiment is located above the terminal 3 and can discharge the arc gas. An exhaust port 5 located below the terminal 3 and capable of discharging arc gas is formed adjacent to the exhaust port 5 capable of exhausting above the terminal 3. Therefore, since the distance between the adjacent exhaust ports 5 is increased, the insulation between the terminals 3 can be easily maintained.

  The circuit breaker 1 of the present embodiment is formed such that the vertical position of the terminal 3, that is, the distance from the mounting surface S to the terminal 3 is different between adjacent terminals 3. Therefore, the distance between the terminals 3 can be secured, and the insulation between the terminals 3 can be more easily maintained.

  Here, the periphery of the exhaust port 5 of the circuit breaker 1 of the present embodiment will be described more specifically. FIG. 9 is a perspective view showing a cross section of the central terminal portion 9a. FIG. 10 is a perspective view showing a cross section of the terminal portion 9b located on the left and right sides. Three exhaust ports 5 in the present embodiment are largely provided. The three exhaust ports 5 are provided so as to correspond to the respective terminals 3. The exhaust ports 5 of the present embodiment are all open in the depth direction. The exhaust port 5a corresponding to the central terminal 3a among the three terminals 3 is formed by a plurality of holes made of, for example, a slit shape or a lattice shape. The exhaust port 5a is formed to be evacuated below the central terminal 3a. The exhaust port 5b corresponding to the terminal 3b arranged on the left and right sides of the central terminal 3a is formed by a plurality of holes having a circular cross section. The exhaust port 5b is formed so as to be able to exhaust air above the terminals 3b arranged on the left and right sides.

  The upper end of the exhaust port 5a corresponding to the center terminal 3a is located below the lower end of the exhaust port 5b corresponding to the terminal 3b arranged on the left and right sides thereof. That is, the distance between the upper end of the exhaust port 5a corresponding to the center terminal 3a and the mounting surface S is shorter than the distance between the lower end of the exhaust port 5b arranged on the left and right sides and the mounting surface S.

  Next, the position in the depth direction of the exhaust port 5 in the circuit breaker 1 of the present embodiment will be described. Of the three terminals 3, the exhaust port 5a corresponding to the central terminal 3a is located on the end side of the exhaust port 5b corresponding to the terminal 3b arranged on the left and right sides thereof. More specifically, the exhaust port 5a corresponding to the central terminal 3a is formed in the end face 42. Therefore, the exhaust port 5 a is opened on the end side of the terminal 3.

  The exhaust ports 5b corresponding to the terminals 3b arranged on the left-right side are each formed closer to the center than the end face 42 of the circuit breaker 1. More specifically, the exhaust port 5b is opened at the center side that is closer to the handle 11 than the terminals 3b arranged on the left and right sides. The exhaust port 5b is located closer to the handle side of the circuit breaker 1 than the exhaust port 5a disposed on the end side of the center terminal 3a.

  Further, the terminals 3a and 3b formed in each terminal portion 9 are arranged to be staggered in the front-rear direction. More specifically, the central terminal 3a is disposed above the terminals 3b disposed on the left and right sides thereof.

  Incidentally, as can be understood from FIG. 2, a groove 72 is formed in the partition wall 7 formed between the terminals 3. The groove 72 contributes to securing a creepage distance between the terminals 3. It is also possible to guide a terminal cover (not shown) that covers the terminal portion 9. If a terminal cover is attached, it is easy to secure a spatial distance between the adjacent terminal portions 9.

  Moreover, the protruding partition part 44 is formed in the outer side of the terminal part 9b located in the left-right side used as both ends among the terminal parts 9 arrange | positioned in parallel. The protruding partition wall 44 is formed so as to protrude from the end face 42 where the exhaust port 5a corresponding to the central terminal 3a is formed. Since the protruding partition wall 44 is formed, it is possible to secure a spatial distance between the adjacent circuit breakers 1 even if a plurality of circuit breakers 1 are arranged in parallel.

  As mentioned above, although one embodiment has been described, the present invention is not limited to the above-described embodiment, and various modes can be adopted. For example, the number of terminals may be two or more than four.

  Even when three terminals 3 are formed, the central terminal 3a can be disposed below the terminals 3b disposed on the left and right sides thereof. In that case, the distance between the exhaust port 5a corresponding to the center terminal 3a and the mounting surface S can be longer than the distance between the exhaust port 5b corresponding to the terminal 3b arranged on the left and right sides and the mounting surface S. It is.

  Further, in the present invention, the terminal 3 has been described as a power supply side terminal. However, the terminal 3 may be used as a load side terminal 3.

  Further, the exhaust ports 5b corresponding to the terminals 3b arranged on the left and right sides may each have a height different from the mounting surface S. It is sufficient that at least the exhaust ports 5a and 5b of the adjacent terminals 3a and 3b have a height different from that of the mounting surface S.

1 Circuit breaker 3 Terminal 5 Exhaust port 7 Bulkhead 9 Terminal 19 Rear

Claims (4)

A plurality of terminal portions having terminals to which wiring is connected,
Each terminal has an exhaust port that can discharge arc gas,
A circuit breaker formed such that the vertical positions of the exhaust ports are different from each other at adjacent exhaust ports.   2. The circuit breaker according to claim 1, wherein the positions of the exhaust ports in the depth direction are different from each other at adjacent exhaust ports.   The circuit breaker according to claim 1 or 2, wherein one of the exhaust ports is provided above the terminal, and the adjacent exhaust port is provided below the terminal.   The circuit breaker according to any one of claims 1 to 3, wherein the vertical positions of the terminals are different from each other at adjacent terminals.

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