JP7161034B2 - air circuit breaker cover - Google Patents

Description

The present invention relates to a detachable air circuit breaker cover.

BACKGROUND ART Conventionally, a circuit breaker is provided with a detachable cover attached to a circuit breaker body. For example, Patent Literature 1 discloses a technique of providing a snap-fit structure to a cover attached to a circuit breaker body in order to make the cover detachable.

JP 2009-266480 A

The air circuit breaker can be attached with accessories, and has a structure in which the cover can be removed from the circuit breaker body so that the accessories can be replaced or added even after installation on the switchboard. Such a cover generally has a structure in which a plurality of portions are fastened to the main body of the air circuit breaker with fastening members such as screws in order to withstand the internal gas pressure generated at the time of interruption. Therefore, it is difficult to easily replace or add accessories.

When the snap-fit structure described in Patent Document 1 is adopted for the cover that covers the accessories, the work of replacing or adding accessories can be easily performed, but the fixing strength against the internal gas pressure generated when shutting down is insufficient. there's a possibility that. Moreover, this is not limited to the cover that covers the accessories, and the same applies to other covers to which the internal gas pressure generated at the time of disconnection is applied.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cover for an air circuit breaker that can be easily removed while maintaining fixing strength against the internal gas pressure generated at the time of interruption.

In order to solve the above-mentioned problems and achieve the object, the cover of the air circuit breaker of the present invention is provided with a cover main body and cantilevered on one end of the cover main body, and engaged with an engagement target in the air circuit breaker. and two or more mating engagement pieces. Each of the two or more engaging pieces includes a V-shaped elastic portion whose base end is supported by the end portion of the cover body, and a V-shaped elastic portion provided at a distal end of the elastic portion at positions separated from each other to engage with the engagement target. and a pair of protrusions that A hooking rib for hooking the tip of the tool and a guide groove for guiding the tip of the tool to the hooking rib are formed at the tip of the elastic portion at the central portion in the direction in which the pair of protrusions face each other. The guide groove is formed continuously from the end surface of the tip of the elastic portion to the hooking rib.

ADVANTAGE OF THE INVENTION According to this invention, it is effective in the ability to remove easily, giving fixing strength with respect to the gas internal pressure which generate|occur|produces at the time of interruption|blocking.

1 is an external perspective view of a cover of an air circuit breaker according to Embodiment 1 of the present invention; FIG. Front view of the cover of the air circuit breaker according to the first embodiment FIG. 4 is a diagram showing how the attached detachable cover according to the first embodiment is removed from the main cover; FIG. 2 is an external perspective view of an engagement piece of the accessory detachable cover according to the first embodiment; Cross-sectional view along the V-V line in Fig. 2 FIG. 4 is a diagram for explaining a method of removing the accessory detachable cover from the main cover according to the first embodiment; FIG. 4 is a cross-sectional view for explaining the force applied to the engaging piece when the attached detachable cover according to the first embodiment is removed from the main cover; FIG. 4 is a diagram showing a state in which the engagement between the engagement piece of the accessory detachable cover and the main cover according to the first embodiment is released; A diagram for explaining the force generated in the elastic portion of the engaging piece when it is assumed that the center of rotation is closer to the case than the center of rotation shown in FIG. The figure which shows an example of the cover of the air circuit breaker concerning Embodiment 2 of this invention.

Below, the cover of the air circuit breaker according to the embodiment of the present invention will be described in detail based on the drawings. In addition, this invention is not limited by this embodiment.

Embodiment 1.
FIG. 1 is an external perspective view of a cover of an air circuit breaker according to Embodiment 1 of the present invention. 2 is a front view of the cover of the air circuit breaker according to the first embodiment. FIG.

As shown in FIGS. 1 and 2, the air circuit breaker cover 100 includes a main cover 1 attached to a case 200 and an attached removable cover 2 detachably attached to the main cover 1 . In FIG. 1, the outer shape of the case 200 is indicated by imaginary lines, but the shape of the case 200 is not limited to the example shown in FIG.

In addition, the main cover 1 includes a first front wall portion 11 in which an ON button, an OFF button, a display, etc. are arranged, and one end continuous with the outer edge of the first front wall portion 11, and extending from one end to the other end. A plurality of side walls 12, 13, 14, 15 extending toward the case 200 are provided. Further, the main cover 1 includes a second front wall portion 16 having one end continuous with the other end of the side wall portion 12 and extending in a direction parallel to the first front wall portion 11 and away from the other end of the side wall portion 12, and the side wall portion 13 , parallel to the first front wall portion 11 and extending in a direction away from the other end of the side wall portion 13 .

Further, the main cover 1 has a side wall portion 18 having one end continuous with the other end of the second front wall portion 16 and extending from one end toward the other end toward the case 200 , and the other end of the third front wall portion 17 . A side wall portion 19 having one end continuous and extending from one end to the other end toward the case 200 is provided.

A plurality of fastening portions 16a and 16b are formed on the second front wall portion 16, a plurality of fastening portions 17a and 17b are formed on the third front wall portion 17, and a fastening portion 18a is formed on the side wall portion 18. It is formed. These fastening portions 16a, 16b, 17a, 17b, 18a and the case 200 are fastened with screws. As a result, the main cover 1 is firmly fixed to the case 200, and fixing strength against the internal gas pressure generated when the air circuit breaker is interrupted can be secured.

The attachment/detachment cover 2 includes a cover body 20 that covers an accessory (not shown), and two engaging pieces 3 that are cantilevered at the ends of the cover body 20 . Further, the cover main body 20 is formed with a concave engaging portion 4 into which a convex engaging portion (not shown) of the main cover 1 is inserted. The accessory detachable cover 2 is fixed to the main cover 1 by two engaging pieces 3 and an engaging portion 4 . The accessories (not shown) are, for example, a voltage tripping device that turns off the air circuit breaker from a distance, an undervoltage tripping device that turns off the air circuit breaker when the voltage of the electric circuit drops below the standard, An auxiliary switch that electronically indicates the on or off state of the air circuit breaker.

The cover body 20 includes a front wall portion 21 arranged in a notch portion of the first front wall portion 11 of the main cover 1 and positioned on the same plane as the first front wall portion 11 , and one end at the upper end of the front wall portion 21 . A side wall portion 22 continuously extending from one end to the other end toward the case 200 side, and a side wall portion having one end continuous to one side end of the front wall portion 21 and extending from the one end toward the other end toward the case 200 side. 23. The cover body 20 also includes an overhanging portion 24 whose one end is continuous with the other end of the side wall portion 23 and which extends in parallel with the front wall portion 21 and away from the other end of the side wall portion 23 . The projecting portion 24 is located on the same plane as the second front wall portion 16 .

Each engaging piece 3 has a snap-fit structure. A convex engaging portion (not shown) of the main cover 1 is inserted into a concave engaging portion 4 formed in the cover body 20 , and the two engaging pieces 3 are engaged with the second front wall portion 16 of the main cover 1 . By fitting together, the attached detachable cover 2 is fixed to the main cover 1. - 特許庁The engagement between the main cover 1 and the attachment/detachment cover 2 by the two engagement pieces 3 and the engagement portion 4 will be specifically described below.

3A and 3B are diagrams showing how the accessory detachable cover according to the first embodiment is removed from the main cover. FIG. FIG. 4 is an external perspective view of an engagement piece of the attached detachable cover according to the first embodiment. 5 is a cross-sectional view taken along line V-V in FIG. 2. FIG.

As shown in FIG. 3, a tool 300 such as a slotted screwdriver can be used to disengage the two engaging pieces 3 of the accessory detachable cover 2 from the second front wall portion 16 of the main cover 1. As shown in FIG. .

As shown in FIG. 4, the engaging piece 3 is provided at a V-shaped elastic portion 31 whose base end is supported by the other end of the overhanging portion 24 and at the distal end portion of the elastic portion 31 at positions separated from each other. It has a pair of protrusions 32 that engage the second front wall portion 16 .

The elastic portion 31 has a base end supported by the other end of the overhanging portion 24, and extends from the base end toward the tip in a direction perpendicular to the extending direction of the overhanging portion 24, and a first extending portion 31a. The proximal end is continuous with the distal end of 31 a and has a folded portion 31 b that folds back toward the second front wall portion 16 . In addition, the elastic portion 31 has a second extension portion 31c that extends to a region facing the first extension portion 31a, with the proximal end continuing to the distal end of the folded portion 31b. The second extending portion 31c extends away from the first extending portion 31a toward the distal end from the proximal end in the direction facing the first extending portion 31a.

The engaging piece 3 also has a guide groove 33 for guiding the tip of the tool 300 and a hooking rib 34 for hooking the tip of the tool 300 . The guide groove 33 and the hooking rib 34 are formed at the central portion of the distal end portion of the elastic portion 31 in the direction in which the pair of projecting portions 32 face each other.

As shown in FIG. 5, an engaging portion 7 is provided at the end of the second front wall portion 16 facing the engaging piece 3 . The engaging portion 7 has an engaging surface 71 that faces the case 200 and an inclined surface 72 that is formed on the opposite side of the case 200 and that is inclined toward the case 200 toward the tip. . In the state shown in FIG. 5, the projecting portion 32 of the engaging piece 3 is in contact with the engaging surface 71 of the engaging portion 7, and the projecting portion 32 of the engaging piece 3 is engaged with the engaging portion 7. be. As a result, removal of the accessory detachable cover 2 from the main cover 1 is suppressed.

In addition, since the attached detachable cover 2 is engaged with the main cover 1 by two engaging pieces 3, it is firmly fixed to the main cover 1, and the fixing strength against the internal gas pressure generated when the air circuit breaker is cut off is increased. can be secured. Note that the attachment/detachment cover 2 may be configured to have three or more engagement pieces 3 . In addition, since the fastening portion 16a is fastened to the case 200 by screws between the two engagement pieces 3 of the main cover 1, the position of the engagement portion 7 changes due to the internal gas pressure generated when the air circuit breaker is interrupted. can be suppressed. As a result, it is possible to ensure the fixing strength against the internal gas pressure generated when the air circuit breaker is interrupted.

Next, a method of removing the attachment/detachment cover 2 from the main cover 1 will be described. FIG. 6 is a diagram for explaining a method of removing the accessory detachable cover from the main cover according to the first embodiment. As shown in FIG. 6 , when the accessory detachable cover 2 is attached to the main cover 1 , the recessed engaging portion 4 formed in the cover body 20 has the first front wall portion 11 of the main cover 1 attached thereto. A convex engaging portion 5 formed in the is inserted.

As shown in FIG. 6 , the attachment/detachment cover 2 is removed from the main cover 1 by inserting the tip of a tool 300 into the engagement piece 3 . Specifically, by inserting the tip of the tool 300 into the guide groove 33 shown in FIG. . In this state, by moving the tip of the tool 300 in the direction in which the elastic portion 31 of the engaging piece 3 bends, the projecting portion 32 of the engaging piece 3 moves away from the engaging portion 7 .

With the pair of protruding portions 32 separated from the engaging portion 7 , the attachment/detachment cover 2 is rotatable around the engaging portion 5 . By rotating the attachment/detachment cover 2 counterclockwise in FIG. 6, the attachment/detachment cover 2 can be removed from the main cover 1 as shown in FIG.

Here, the force applied to the engagement piece 3 when the attachment detachable cover 2 is detached from the main cover 1 will be described. FIG. 7 is a cross-sectional view for explaining the force applied to the engaging pieces when the attached detachable cover according to the first embodiment is removed from the main cover. FIG. 8 is a diagram showing a state in which the engagement between the engagement piece of the attached detachable cover and the main cover according to the first embodiment is released.

When the attached detachable cover 2 rotates around the engaging portion 5 shown in FIG. 6 while the operator bends the elastic portion 31 of one of the engaging pieces 3 with the tool 300, the state shown in FIG. 7 is obtained. Become. In the state shown in FIG. 7, the elastic portion 31 of one of the engaging pieces 3 is bent by the engaging portion 7, and the elastic portion 31 does not return to the original shape 9 indicated by the phantom line. A force in the direction of arrow A is generated.

Further, since the center of rotation of the attached detachable cover 2 is the engaging portion 5 shown in FIG. It moves along an arc trajectory 51 with 5 as the center. Therefore, as the elastic portion 31 of the engaging piece 3 moves in the direction of the arrow B, the elastic portion 31 moves toward the inclined surface 72 . Therefore, the force that causes the elastic portion 31 to return to the original shape 9, that is, the force in the direction of the arrow A generated in the elastic portion 31 can be increased.

Further, as described above, the engaging portion 7 is formed with the inclined surface 72 , and the elastic portion 31 is in contact with the inclined surface 72 in the state shown in FIG. 7 . Therefore, the inclined surface 72 generates a force to move in the direction of the arrow B with the engaging portion 5 as the center of rotation. The direction of the arrow B is the direction in which the attachment detachable cover 2 is removed from the main cover 1 in the circular arc trajectory 51 of the elastic portion 31 with the engaging portion 5 as the center of rotation.

Therefore, even when the operator releases the attachment/detachment cover 2, the position of one of the engaging pieces 3 is maintained at the position shown in FIG. It will not return to the position shown in FIG. 5 unless intentionally applied.

In this state, when the elastic portion 31 of the other engaging piece 3 is flexed, the attachment attachment/detachment attachment is moved in the direction of the arrow B by the force generated in the one engaging piece 3 to move in the direction of the arrow B. Cover 2 moves. As a result, the attachment/detachment cover 2 is removed from the main cover 1, as shown in FIG. As a result, the attachment/detachment cover 2 configured to have two or more engagement pieces 3 can be easily removed from the main cover 1 .

The cover 100 is configured such that when one of the engaging pieces 3 is in the state shown in FIG. 7 and the elastic portion 31 of the other engaging piece 3 is bent, the attachment/detachment cover 2 does not move in the direction of the arrow B. may be Even in this case, a force to move in the direction of arrow B is generated in one engaging piece 3 . Therefore, the worker can easily remove the attachment/detachment cover 2 from the main cover 1 with a small force for moving the attachment/detachment cover 2 in the direction of the arrow B.

Here, it is assumed that the center of rotation is not the engagement portion 5 shown in FIG. 6 but the end portion 8 shown in FIG. FIG. 9 is a diagram for explaining the force generated in the elastic portion of the engaging piece when it is assumed that the center of rotation is closer to the case than the center of rotation shown in FIG.

As shown in FIG. 9, when the end portion 8 shown in FIG. 6 is the center of rotation of the accessory detachable cover 2, the elastic portion 31 of the engaging piece 3 moves along an arc trajectory 52 around the end portion 8 shown in FIG. to move. In this case, the elastic portion 31 of the engaging piece 3 moves away from the inclined surface 72 as it moves in the direction of arrow C, so that the force generated in the direction of arrow A is different from the case shown in FIG. weak in comparison.

On the other hand, when the engaging portion 5 shown in FIG. 6 becomes the rotation center of the attachment detachable cover 2, the elastic portion 31 of the engaging piece 3 moves in the direction approaching from the inclined surface 72 as described above. The force generated in the direction of arrow A is stronger than in the state shown in FIG. Therefore, the attachment/detachment cover 2 according to the first embodiment can increase the force for moving the cover body 20 in the arrow B direction.

In addition, since the elastic portion 31 of the engaging piece 3 is formed in a V shape, it is possible to increase the amount of bending compared to the case where it is formed in a U shape. Therefore, the elastic portion 31 of the engaging piece 3 can increase the force of the elastic portion 31 trying to return to the original shape 9 when moved in the direction of approaching from the inclined surface 72 . Therefore, the attachment/detachment cover 2 configured to have two or more engagement pieces 3 can be easily removed from the main cover 1 .

In addition, although the object to which the engaging piece 3 and the engaging portion 4 are provided is the attached detachable cover 2, the engaging piece 3 and the engaging portion 4 are not limited to the attached detachable cover 2. It may be provided on a cover other than the accessory detachable cover 2 to which the pressure is applied. Further, the object to be engaged with the accessory detachable cover 2 may be the case 200 instead of the main cover 1 .

In the example described above, the engaging portion 4 is formed in a concave shape and the engaging portion 5 is formed in a convex shape, but the present invention is not limited to such an example. For example, the cover 100 may have a configuration in which the engaging portion 4 is formed in a convex shape and the engaging portion 5 is formed in a concave shape.

As described above, the detachable cover 2 attached to the cover 100 includes the cover main body 20 and two or more cantilevered support members of the cover main body 20 that engage with the main cover 1 that is the object of engagement in the air circuit breaker. and an engaging piece 3 . Each engaging piece 3 includes a V-shaped elastic portion 31 whose base end is supported by the end of the cover body 20, and a protruding portion 32 provided at the tip of the elastic portion 31 and engaged with an engagement target. have. In this way, since the attachment/detachment cover 2 is engaged with the main cover 1 by the two engagement pieces 3, it is firmly fixed to the main cover 1 and is fixed against the internal gas pressure generated when the air circuit breaker is cut off. Strength can be secured. Further, since the engaging piece 3 has a snap-fit structure, the attachment/detachment cover 2 can be easily attached/detached when replacing or adding an accessory. Moreover, since the elastic portion 31 of the engaging piece 3 is formed in a V shape, it is possible to increase the amount of bending. Therefore, for example, the force of the elastic portion 31 to return to the original shape 9 can be increased, and the force to move the accessory detachable cover 2 in the detaching direction is increased. The attachment/detachment cover 2 having the structure can be easily removed from the main cover 1. - 特許庁

Further, the cover main body 20 rotates when the cover main body 20 is removed from the main cover 1 to the engaging portion 5 different from the engaging portion 7 with which the two or more engaging pieces 3 of the main cover 1 engage. It has an engagement part 4 for possible engagement. The engaging portion 7 is an example of a first engaging portion, the engaging portion 5 is an example of a second engaging portion, and the engaging portion 4 is an example of a cover body engaging portion. The engaging portion 4 is arranged at a position where the elastic portion 31 of the engaging piece 3 approaches the engaging portion 7 when the cover body 20 is removed from the main cover 1 . As a result, the force for moving the cover body 20 in the direction of removing the attached detachable cover 2 from the main cover 1 can be increased. Therefore, the attachment/detachment cover 2 configured to have two or more engaging pieces 3 can be easily removed from the main cover 1 .

Also, the cover 100 has a cover body 20 and two or more engaging pieces 3, an attachment/detachment cover 2 for covering accessories of the air circuit breaker, and a main cover 1 to which the attachment/detachment cover 2 is attached. and The attachment/detachment cover 2 is an example of a first cover, and the main cover 1 is an example of a second cover. As a result, the cover 100 can be partially removed, and accessories can be replaced or added more easily than when the entire cover 100 is removed.

Embodiment 2.
The cover of the air circuit breaker according to the second embodiment differs from the cover of the air circuit breaker according to the first embodiment in that the engaging piece has a knob portion. In the following, constituent elements having functions similar to those of the first embodiment are denoted by the same reference numerals, and descriptions thereof are omitted, and differences from the cover 100 of the first embodiment are mainly described. FIG. 10 is a diagram showing an example of the cover of the air circuit breaker according to Embodiment 2 of the present invention.

As shown in FIG. 10, the air circuit breaker cover 100A according to the second embodiment includes a main cover 1 and an attached detachable cover 2A. The attachment/detachment cover 2A includes a cover body 20 and engagement pieces 3A. The engaging piece 3A projects outward from the main cover 1 in a state in which the attached detachable cover 2A is attached to the main cover 1, and has a grip portion 35 that can be pinched by an operator's fingers. different from 3. Two or more engaging pieces 3A are provided on the attachment/detachment cover 2A.

The knob portion 35 has a proximal end that is continuous with the distal end of the elastic portion 31 , and the distal end protrudes from the second front wall portion 16 in the state shown in FIG. 10 . The operator can release the engagement between the elastic portion 31 of the engaging piece 3A and the engaging portion 7 of the second front wall portion 16 by pinching the knob portion 35 and moving it toward the cover body 20. can be done. In addition, in the accessory detachable cover 2A, the knob portion 35 is provided on each engagement piece 3A, but the knob portion 35 may be provided on at least one of the two or more engagement pieces 3A. good.

As described above, in the attached detachable cover 2A of the cover 100A according to the second embodiment, at least one of the two or more engaging pieces 3A has the knob portion 35 that bends the elastic portion 31. Prepare. As a result, the engagement between the accessory detachable cover 2A and the main cover 1 can be easily released. Therefore, the attachment/detachment cover 2A can be easily removed from the main cover 1. As shown in FIG.

The configuration shown in the above embodiment shows an example of the content of the present invention, and it is possible to combine it with another known technology, and one configuration can be used without departing from the scope of the present invention. It is also possible to omit or change the part.

Reference Signs List 1 main cover 2, 2A attachment/detachment cover 3, 3A engagement piece 4, 5, 7 engagement portion 8 end 9 shape 11 first front wall portion 12, 13, 14, 15, Reference Signs List 18, 19, 22, 23 side wall portion 16 second front wall portion 16a, 16b, 17a, 17b, 18a fastening portion 17 third front wall portion 20 cover main body 21 front wall portion 24 projecting portion 31 Elastic portion 31a First extension portion 31b Folded portion 31c Second extension portion 32 Protruding portion 33 Guide groove 34 Hook rib 35 Knob portion 51, 52 Circular track 71 Engaging surface 72 Inclined surface 100, 100A cover, 200 case, 300 tool, A, B, C arrows.

Claims (4)

a cover body;
two or more engagement pieces that are cantilevered on one end of the cover body and engage with an engagement target in the air circuit breaker;
Each of the two or more engagement pieces,
a V-shaped elastic portion having a base end supported by an end portion of the cover body;
a pair of protruding portions that are provided at positions separated from each other at the distal end of the elastic portion and that engage with the engagement target ;
At the tip of the elastic part,
A hooking rib for hooking the tip of the tool and a guide groove for guiding the tip of the tool to the hooking rib are formed in the central portion in the direction in which the pair of protrusions face each other,
The guide groove is
It is formed continuously from the end surface of the tip of the elastic portion to the hooking rib.
An air circuit breaker cover characterized by: At least one engaging piece among the two or more engaging pieces,
The cover for an air circuit breaker according to claim 1, further comprising a knob portion that bends the elastic portion. The cover body is
A second engaging portion different from the first engaging portion with which the two or more engaging pieces engage among the engaging objects is rotatably engaged when the cover main body is removed from the engaging object. a cover body engaging portion that fits,
The cover body engaging portion is
The air circuit breaker cover according to claim 1 or 2, wherein the elastic portion is arranged at a position approaching the first engaging portion when the cover main body is removed from the engagement target. a first cover having the cover main body and the two or more engaging pieces and covering an accessory of the air circuit breaker;
The air circuit breaker cover according to any one of claims 1 to 3, further comprising a second cover to which the first cover is attached and which is the object of engagement.

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