JP7427332B2 - circuit breaker - Google Patents

Description

The present invention relates to a circuit breaker equipped with an overcurrent tripping device.

A circuit breaker includes an overcurrent tripping device that interrupts a circuit when an overcurrent flows through the circuit. A circuit breaker has a case divided into a lower base and an upper cover, and the overcurrent tripping device is usually housed inside the base and attached to the circuit breaker by covering it with a cover.

Conventionally, a small gap has been provided between the yoke and the cover in consideration of the dimensional tolerance between the yoke and the cover that constitute the overcurrent tripping device. As a result, when the handle of the circuit breaker is turned off, the impact force causes the yoke to vibrate strongly, causing the armature attached to the yoke to lift or rotate, potentially causing a malfunction that could cause the circuit breaker to trip. .

Therefore, as described in Patent Document 1, if the upper end of the yoke is brought into contact with the back surface of the cover, part of the impact force is released to the cover, thereby suppressing the vibration of the yoke and preventing the armature from floating or rotating. Can be suppressed. However, as mentioned above, there are dimensional tolerances between the yoke and the cover, so if they are molded to be larger than the standard dimensions, the cover will be lifted by the yoke, and there will be gaps between the cover and the base, or between the cover and other parts. There was a risk that an undesirable gap would occur.

Japanese Patent Application Publication No. 7-161278

Therefore, an object of the present invention is to provide a circuit that prevents the armature from floating or rotating due to the impact force when the handle is operated, and also prevents undesirable gaps from forming between the cover and the base or between the cover and other parts. The purpose is to provide circuit breakers.

The present invention, which was made to solve the above problems, houses a mechanism section that opens and closes a circuit, and an overcurrent tripping device that opens the mechanism section when an overcurrent flows through the circuit, and houses the mechanism section and the overcurrent tripping device that opens the mechanism section when an overcurrent flows in the circuit. The overcurrent tripping device is a circuit breaker covered with The deformable portion is a deformable member that is attached to either the upper end of the vertical piece of the yoke or the cover, and deforms when the upper end of the vertical piece of the yoke contacts either of the cover. That is.

The present invention, which was made to solve the above problems, houses a mechanism section that opens and closes a circuit, and an overcurrent tripping device that opens the mechanism section when an overcurrent flows through the circuit, and houses the mechanism section and the overcurrent tripping device that opens the mechanism section when an overcurrent flows in the circuit. The overcurrent tripping device is a circuit breaker covered with The deformable portion is a convex portion that protrudes toward the yoke from inside a yoke holding groove that is formed on the back surface of the cover and holds the yoke, and is characterized in that it deforms when it comes into contact with the yoke. be. The yoke includes protrusions that protrude in the left-right direction above the vertical piece, the upper ends of these protrusions are held in the yoke holding groove, and the deformed part and the upper ends of these protrusions abut. The structure can be Further, the yoke may have a structure in which an armature storage portion is provided at the upper end of the vertical piece, and one of the upper ends of the vertical piece forming the storage portion further protrudes toward the storage portion .

According to the present invention, by forming the deformed part between the upper end of the vertical piece of the yoke and the cover, the yoke and the cover are brought into contact via the deformed part, and the impact force when the handle is operated is reduced. Some of it can escape into cover. This prevents the armature from floating or rotating due to impact force when operating the handle. Furthermore, since the deformed portion absorbs dimensional tolerances between the yoke and the cover, it is possible to prevent undesirable gaps from forming between the cover and the base or between the cover and other parts.

It is an external perspective view of a circuit breaker of an embodiment. FIG. 3 is a perspective view with the cover removed. 2 is a sectional view taken along line AA in FIG. 1. FIG. FIG. 4 is an exploded view of FIG. 3; FIG. 3 is an enlarged sectional view of main parts. FIG. 3 is a perspective view of main parts. FIG. 3 is an exploded perspective view of main parts. It is an explanatory view of a deformation part. 2 is a sectional view taken along line BB in FIG. 1. FIG.

Preferred embodiments of the present invention will be described below.
FIG. 1 is an external perspective view of a circuit breaker according to an embodiment, FIG. 2 is a perspective view with a cover removed, and FIG. 3 is a sectional view taken along line AA in FIG. 1. As shown in these figures, the circuit breaker of the embodiment includes a case that is made up of a base 10 and a cover 11 and can be divided into upper and lower parts. In this embodiment, the sub-base 12 is provided below the base 10, but the sub-base 12 may be omitted. 13 is a power supply side terminal arranged on the front side of the base 10, 14 is a load side terminal arranged on the rear side, and 15 is a handle. In this specification, as shown in FIG. 2, the direction of the power supply side terminal 13 is the front, the direction of the handle 15 is the top, and the width direction is the left and right.

Inside the base 10, there is a known mechanism that opens and closes the circuit by moving a movable contact in conjunction with the handle 15, and a mechanism that opens and closes the circuit when an abnormal current such as an overcurrent or large current flows in the circuit. Built-in overcurrent trip device. As shown in FIGS. 5 and 6, the overcurrent tripping device includes a yoke 20, an armature 21, a trigger lever 22, a dashpot 23, and the like.

The yoke 20 is formed into a substantially L-shape when viewed from the side, and includes a vertical piece 24 and a bottom portion 25. The dashpot 23 is attached to the bottom part 25 of the yoke 20, and a coil 26 is provided around it. The upper end of the coil 26 is welded to the adjacent L-shaped load side terminal 14, and the other end is connected to an electric wire to a movable contact (not shown). When an excessive current flows through the circuit, a magnetic attraction force acts between the head of the dashpot 23 and the armature 21, and the armature 21 is attracted to the head of the dashpot 23 against the force of the spring 27. As a result, the leg of the armature 21 acts on the trigger lever 22, tripping the mechanism to open the contacts and interrupt the circuit. Note that the armature 21 is assembled to the upper part of the yoke 20, as shown in FIGS. 6 and 7. Such an overcurrent tripping device is not particularly different from the conventional one.

A mounting portion 29 is formed at the lower end of the vertical piece portion 24 of the yoke 20. By inserting this mounting portion 29 into a slit-shaped yoke mounting portion (FIG. 3) provided in the base 10, the yoke 20 is attached to the base 10. By bending a portion of this attachment portion 29 in the front-back direction, movement of the yoke 20 in the front-back direction can be suppressed.

As shown in FIG. 6, this embodiment includes protrusions 30 and 31 that protrude in the left-right direction above the vertical piece 24 of the yoke 20. When the cover 11 is attached to the base 10, the upper ends of these protrusions 30, 31 are held in an inverted U-shaped yoke holding groove 32 formed on the back surface of the cover 11, as shown in FIG. A deformed portion 33 is formed inside this yoke holding groove 32, and as shown in FIG. 9, the deformed portion 33 and the upper ends of these protrusions 30 and 31 are in contact with each other. In the present invention, a deformed portion 33 is formed between the upper end of the vertical piece 24 forming the armature storage portion 40 provided at the upper end of the vertical piece 24 of the yoke 20 and the yoke holding groove 32 of the cover 11. Good too. Furthermore, the side surfaces of the left and right protrusions 30 and 31 are in contact with the cover 11 to restrict movement of the yoke 20 in the left and right direction.

In this embodiment, the deformable portion 33 is a substantially hemispherical convex portion integrally molded with the cover 11 . Since the cover 11 is made of resin and the deformable portion 33 is a small protrusion, it is deformable, and even if there is a dimensional tolerance between the yoke 20 and the cover 11, the yoke 20 and the cover 11 can be kept in contact with each other at all times. The deformed portion 33 can also be formed on the yoke 20 side. In addition to integrally molding the deformable portion 33 with the cover 11 and the yoke 20 as described above, a separate deformable member such as an elastic sheet such as a rubber sheet or an elastic tape may be attached to the cover 11 and the yoke 20. Here, the deformable portion 33 may be one that deforms elastically or plastically, and when the cover 11 is attached to the base 10 and the base 10 and the cover 11 are tightened with screws. Any type of material may be used as long as it is deformed and comes into contact with the cover 11 or the yoke 20.

If the deformed portion 33 is formed between the upper end of the vertical piece 24 of the yoke 20 and the cover 11 in this way, even if there is a dimensional tolerance between the yoke 20 and the cover 11, when the cover 11 is attached to the base 10, By deforming the deforming portion 33, the yoke 20 and the cover 11 can be brought into constant contact. Therefore, undesirable gaps do not occur between the cover 11 and the base 10 or between the cover 11 and other parts.

Further, since the yoke 20 and the cover 11 can be kept in contact with each other through the deformable portion 33, the impact force received by the yoke when the handle 15 is turned off and the mechanism is operated is absorbed by the deformable portion 33. It can be released to the cover 11 through. As a result, the armature 21 supported by the yoke 20 can be prevented from lifting or rotating due to impact force, and malfunctions such as tripping of the circuit breaker can be eliminated.

The configuration specific to this embodiment will be explained below.
As shown in FIGS. 6 and 7, in this embodiment, an armature housing portion 40 is provided at the upper end of the vertical piece 24 of the yoke 20. Recesses 41 and 42 are formed on the left and right sides of the armature 21, and the armature 21 is supported by the yoke 20 by fitting these recesses 41 and 42 loosely into the upper ends of the vertical pieces 24. A second protrusion 43 is formed at the upper end of the vertical piece 24 forming the armature housing 40 shown in FIG. 6, and projects inward toward the armature housing 40. As shown in FIG.

By providing the second protrusion 43 in this manner, it is possible to suppress the vertical movement of the armature 21 stored in the armature storage portion 40, and to prevent the armature 21 from falling off or from floating and rotating. It is possible to prevent the armature 21 from being pinched and fixed to the upper end of the yoke 20.

Further, as shown in FIG. 6, a cutout 45 is formed in the center of the vertical piece 24 of the yoke 20, and a first cutout-side protrusion 46 and a second cutout-side protrusion extend toward the cutout 45. 47 is formed. The lower end of a spring 27 for adjusting the angle of the armature 21 when the armature 21 is attached to the yoke 20 is locked to the first cutout side protrusion 46 .

In addition, if the armature 21 is lifted due to impact force, there is a risk that the armature 21 will be caught and fixed to the upper end of the yoke 20, but by forming the second cutout side protrusion 47, the lifting can be prevented. In this case, the leg portion of the armature 21 also comes into contact with the second cutout side protrusion 47 to suppress excessive rotation of the armature 21. Therefore, it is possible to prevent the armature 21 from becoming stuck due to being pinched by the upper end of the yoke 20.

10 Base 11 Cover 12 Sub-base 13 Power side terminal 14 Load side terminal 15 Handle 20 Yoke 21 Armature 22 Trigger lever 23 Dashpot 24 Vertical piece 25 Bottom part 26 Coil 27 Spring 28 Armature storage part 29 Mounting part 30 Projection part 31 Protrusion Section 32 Yoke holding groove 33 Deformation section 40 Armature storage section 41 Recess 42 Recess 43 Second protrusion 45 Cutout 46 First cutout side protrusion 47 Second cutout side protrusion

Claims (4)

A circuit breaker that houses a mechanical part that opens and closes a circuit, and an overcurrent tripping device that opens the mechanical part when an overcurrent flows in the circuit, and is covered with a cover,
The overcurrent tripping device includes a yoke formed in a substantially L-shape when viewed from the side, and a deformed portion is formed between the upper end of the vertical piece of the yoke and the cover ,
The deformable portion is a deformable member that is attached to either the upper end of the vertical piece of the yoke or the cover, and deforms when it comes into contact with either the upper end of the vertical piece of the yoke or the cover. circuit breaker. A circuit breaker that houses a mechanical part that opens and closes a circuit, and an overcurrent tripping device that opens the mechanical part when an overcurrent flows in the circuit, and is covered with a cover,
The overcurrent tripping device includes a yoke formed in a substantially L-shape when viewed from the side, and a deformed portion is formed between the upper end of the vertical piece of the yoke and the cover,
The circuit breaker is characterized in that the deformable part is a convex part that is formed on the back surface of the cover and protrudes toward the yoke from inside a yoke holding groove that holds the yoke, and deforms when it comes into contact with the yoke. The yoke includes protrusions that protrude in the left-right direction above the vertical piece, the upper ends of these protrusions are held in the yoke holding groove, and the deformed part and the upper ends of these protrusions are in contact with each other. The circuit breaker according to claim 2, characterized in that: 3. The yoke is characterized in that the armature storage portion is provided at the upper end of the vertical piece, and one of the upper ends of the vertical piece forming the storage portion further protrudes toward the storage portion. A circuit breaker as described in .

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