JP4892266B2 - Connection structure between main breaker and branch breaker - Google Patents

Description

  The present invention relates to a connection structure for connecting a so-called plug-type branch breaker and a main breaker.

  Conventionally, when wiring from a main breaker to a plurality of branch breakers, a so-called plug-type branch breaker in which a primary side connection terminal is formed in a plug shape is connected to a main bar connected to a secondary side terminal of the main breaker. The structure is generally known. Here, a known example of the main bar to which the branch breaker is connected will be described with reference to FIGS. 5 and 6 are explanatory views showing a connection structure between a main breaker and a branch breaker that are conventionally known. 5 and 6, A is a branch breaker connected to the main bar.

FIG. 5 shows a main breaker 51 in which main bars 52, 52,... Formed in straight strips are installed in parallel in the front-rear direction, and each main bar 52 is a connection bar. It is connected to the secondary side terminal 54 of the main breaker 51 through 53. In this configuration, the main bars 52, 52... Are installed in a stepped manner at the connection bar 53 connection side end so that the main bars 52 and the connection bars 53 can be connected by screws 55.
On the other hand, FIG. 6 shows a main circuit breaker 61 in which strip-shaped main bars 62, 62,... Having arc-shaped corner portions are installed in parallel in the front-rear direction. These are connected to the secondary side terminals 64 of the main breaker 61 via the connection bars 63, respectively. In this configuration, since the corner portions are provided in the main bars 62, 62,..., The main bars 62 and the connection bars 63 can be connected at the same height in the vertical direction of the main breaker 61. it can.

Moreover, as a connection structure which employs a configuration different from the above-described conventional example, there is a structure in which a connection bar as disclosed in Patent Document 1, for example, is bent.
Japanese Utility Model Publication No. 3-4090

However, in the configuration shown in FIG. 5, the main bars 52, 52,... Therefore, it is necessary to increase the dimension a shown in FIG. 5, and there arises a problem that the cabinet for storing and installing the main breaker 51 and the like must be enlarged.
Further, in the configuration as shown in FIG. 6, since the corner portions are provided in the main bars 62, 62... As described above, it is not necessary to install the main bars in a step shape as shown in FIG. However, if the strip-shaped main bar 62 is provided with an arc-shaped corner portion, the outer edge of the corner portion may be cracked, so that the corner portion needs to have a large radius. Therefore, as a result, the problem such as shortening of the dimension b shown in FIG. 6 cannot be effectively solved, and the above problem of increasing the size of the cabinet cannot be solved.

  On the other hand, according to the configuration disclosed in Patent Document 1, when the connection bar is bent, in order to suitably connect the connection bar and the main bar, the main bar is stepped as shown in FIG. Must be installed in. Therefore, the dimension a shown in FIG. 5 cannot be shortened. In addition, when the electric capacity of the main trunk is large, it is necessary to form a large cross-sectional area of the connection bar. In this case, the connection bar should be formed with a large thickness (because the connection bar is connected to the secondary terminal of the main breaker, so that the width of the connection bar matches the secondary terminal of the main breaker). Because it is prescribed). When the connection bar is formed thick, it is physically impossible to perform a bending process as disclosed in Patent Document 1 on the connection bar. Therefore, it can be said that the configuration of Patent Document 1 cannot be suitably used for a large-capacity trunk breaker or the like, that is, lacks practicality and versatility.

  Therefore, the present invention has been made in view of the above problems, and provides a connection structure between a main breaker and a branch breaker that can reduce the size of the cabinet by shortening the distance between the main breaker and the branch breaker. It is something to try.

In order to achieve the above object, the present invention provides a main breaker having a plurality of secondary terminals and a branch breaker having a plug-like primary power supply terminal, which are attached to the secondary terminals, respectively. A main breaker and a branch breaker that are connected to each other via a connection bar and three plate-shaped main bars that are connected to the connection bar and arranged in a stacked manner with a predetermined interval in the thickness direction. In the connection structure, one of the main bars has a straight band shape, while the other two main bars have both ends of the straight metal plate in the same direction with respect to the straight portion. A bent portion that overlaps in the thickness direction is formed by bending so as to protrude at an angle of 90 °, and the length in the longitudinal direction is the same as that of the straight belt-shaped main bar, and the straight belt-shaped main trunk Bar and the fold The main bars are overlapped with each other in the thickness direction at a predetermined interval so that the straight portions of the main bars are parallel to each other, and the bent portions are overlapped with the bent main bars reversed from each other. The connecting bars are respectively projected in opposite directions from the mating portions, and the connection bars are connected to the ends of the straight main bar and the bent parts of the bent main bar, respectively , and the ends of the bent parts A plurality of screw holes for connecting the connection bar are formed in the part, and the screw holes used for connecting the connection bar can be selected according to the interval between the secondary terminals in the main breaker, After the connection bar is connected, an excessively protruding portion of the bent portion is cut .

According to the connection structure of the present invention, a bent portion that overlaps in the thickness direction is formed in at least one of the plurality of main bars, and an end portion thereof is outward from the overlapping portion of the main bars. Since the connecting bars are connected to the ends of the bent portions, all the main bars are stepped when the main bars are arranged in a stacked manner with a predetermined interval in the thickness direction. Even if it is not installed, the main bar and the connection bar can be suitably connected. Therefore, the distance between the main breaker and the branch breaker can be shortened as compared with the conventional connection structure in which all the main bars are installed in a staircase shape, and as a result, the cabinet for storing and installing the main breaker and the branch breaker. The size can be reduced.
In addition, the work to be performed on the main bar is not a process to bend in an arc, but a bending process. Therefore, the distance between the main breaker and the branch breaker can be surely shortened, and the manufacturing cost of the main bar can be reduced. Can be suppressed.
Furthermore, according to the connection structure according to the present invention, unlike the prior art, the main bar connected to the connection bar is bent instead of the connection bar directly attached to the secondary terminal of the main breaker. That is, the main bar is not limited by the shape and size of the secondary terminal of the main breaker, and the main bar is bent. Therefore, even when the capacity of the main trunk is large, for example, the right and left width of the main trunk bar can be widened to cope with it without physically becoming unrealizable, which is highly practical and versatile.
In addition, since the same member is used as the two main bars having the bent portions, the types of parts can be reduced, and the cost required for the mold can be kept low. In addition, it is only necessary to prepare two types of parts at the time of assembling work, and various kinds of work can be simplified, such as easy parts management.
In addition, a plurality of screw holes for connecting the connection bar are drilled at the end of the bent portion of the main bar, and the screw holes used for connecting the connection bar according to the distance between the secondary terminals of the main circuit breaker. Since it can be selected, it is possible to deal with various types of main circuit breakers having different secondary terminal intervals, and it is possible to improve practicality and versatility.

  Hereinafter, a connection structure between a main breaker and a branch breaker according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an explanatory view showing a state in which the main breaker 1 and branch breakers A, A,. FIG. 2 is an explanatory view showing the main bars 3a, 3b, 3c, and FIG. 3 is an explanatory view showing a state in which the main bars 3b, 3c are bent.
Reference numeral 20 denotes a distribution board in which a main breaker 1 and a plurality of branch breakers A, A,... Are housed and installed in a box-shaped cabinet 2, and the main breaker 1 and the branch breakers A, A,. Are connected to the secondary terminals 5, 5,... Of the main breaker 1 via the connecting bars 4, 4,... And the main bars 3a, 3b, 3c connected to the connecting bars 4, respectively.

Here, the main bars 3a, 3b, 3c will be described.
The main bar 3a is a straight belt-like metal plate, and screw holes 6 and 6 are formed at both ends for coupling to the connection bar 4 and the like. Further, the main bar 3b is formed by bending the upper and lower portions of a straight belt-like metal plate as described later, and the screw holes 6 are formed in the bent portions 7 and 7 protruding rightward from the straight portion 8. , 6 are drilled. Further, the main bar 3c is configured such that the main bar 3b is turned upside down and the bent portions 7 and 7 protrude leftward from the straight portion 8 contrary to the main bar 3b.

  As shown in FIG. 3, the bent portions 7 of the main bars 3b and 3c are first bent so as to stand along L1 having an angle of 45 ° with respect to the straight portion 8, and then further bent to L2 parallel to L1. It is formed by folding along. Further, both the upper and lower bent parts 7 and 7 are bent so as to protrude in the same direction with respect to the straight line part 8, and the vertical lengths of the main bars 3b and 3c in the bent state are the upper and lower parts of the main bar 3a. It is almost the same as the direction length.

As shown in FIG. 2, the main bars 3a, 3b, 3c have a predetermined interval in the front-rear direction (thickness direction) in such a posture that the main bar 3a and the straight portions 8 of the main bars 3b, 3c are overlapped in parallel. Placed. In this state, the bent portions 7 and 7 of the main bars 3b and 3c protrude from the overlapping portion of the main bar 3a to the left or right. And the upper end side of each main bar 3a, 3b, 3c and the connection bar 3 are connected with the screw 9, respectively. Further, the plug type primary side connection terminals of the branch breakers A, A,... Are inserted into the straight portions of the main bars 3a, 3b, 3c from the direction perpendicular to the straight portions, and the branch breakers A, A,. Connected.
Each main bar 3a, 3b, 3c is fixed to the cabinet 2 by a fixture (not shown).

According to the connection structure having the above-described configuration, the main bars 3b and 3c are bent so that the connecting portion (the bent portion 7) of the main bars 3b and 3c protrudes left and right from the main bar 3a. Forming. Therefore, unlike the prior art, it is not necessary to install the connection side of the connecting bar 4 in a stepped manner, and the dimension c shown in FIG. 1 can be greatly shortened, and the cabinet 2 can be downsized.
In addition, since the processing to be performed on the main bars 3b and 3c is not the processing to bend in an arc shape but the above-described bending processing, the c dimension can be further reduced and the manufacturing cost of the main bars 3b and 3c can be reduced. Can be suppressed.

  Further, since the main bars 3 a, 3 b, 3 c are not directly attached to the secondary side terminal 5 of the main breaker 1, their left and right widths are not defined as the left and right widths of the secondary side terminals 5. Therefore, the main bars 3a, 3b, 3c can be handled without increasing the thickness by widening the left and right width when the main capacity is large. Therefore, it is possible to bend the main bar used for the main breaker having a large main capacity, and the connection structure described in the above embodiment can be employed. That is, the connection structure described in the above embodiment is rich in practicality and versatility.

  In addition, the main bar 3c is used by turning the main bar 3b upside down. That is, the main bar 3b and the main bar 3c are the same member. Therefore, the types of parts can be reduced, the cost required for the mold can be kept low, and the cost can be reduced, and only two kinds of parts need be prepared at the time of assembling work. It is possible to simplify various operations such as easy part management.

  The configuration according to the connection structure of the present invention is not limited to the aspect of the above embodiment, and the material and shape of the connection bar and the main bar, the connection between the two, and the like without departing from the spirit of the present invention. The configuration related to the above, the configuration related to the installation position of the main breaker and the branch breaker, and the like can be changed as appropriate.

  For example, the connection structure of the present invention is naturally applicable to the case where the main breaker 1 is disposed immediately above the branch breakers A, A... As shown in FIG. And in order to apply suitably in such a case, let the protrusion amount of the bending parts 7 and 7 of the trunk bars 3b and 3c correspond to the space | interval of the secondary side terminals 5 and 5 ... of the trunk breaker 1 (namely ,. A main bar that forms the bent portion 7 in the main bar 3b so that the interval between the screw hole 6 of the main bar 3a and the screw hole 6 of the main bar 3b is substantially the same as the interval between the secondary terminals 5 and 5. The same applies to 3c). By adopting such a configuration, for example, a strip-shaped metal plate can be employed as the connection bars 4, 4..

In addition, in order to be able to cope with various types (especially, secondary terminal spacing) of the main breaker, the main trunk has a relatively long bent portion and a plurality of screw holes formed in the bent portion. Arbitrary screw holes can be used in accordance with the interval between the secondary terminals of the main breaker using a bar, and an excessively protruding bent portion can be cut and used. By adopting this configuration, the practicality and versatility can be further improved.
In addition, when the main bar is bent, the bent portion does not necessarily have to be perpendicular to the straight portion, and there is no problem even if it is bent in an acute angle direction or an obtuse angle direction.

It is explanatory drawing which showed the cabinet which accommodated the connected master breaker and branch breaker. It is explanatory drawing which showed the main bar. It is explanatory drawing which showed a mode that a trunk bar was bent. It is explanatory drawing shown about the connection state at the time of arrange | positioning the main breaker just above a branch breaker. It is explanatory drawing shown about an example of the connection structure of the main breaker and branch breaker known conventionally. It is explanatory drawing shown about the other example of the connection structure of the trunk breaker and branch breaker known conventionally.

Explanation of symbols

  1 .... Main breaker 2 .... Cabinet 3a, 3b, 3c ...... Main bar 4 .... Connection bar 5 .... Secondary terminal 6 .... Screw hole 7 ... Folded part 8 ... Straight part, 9 screw.

Claims (1)

A main breaker having a plurality of secondary side terminals and a branch breaker having a plug-like primary power supply terminal, three connection bars respectively attached to the secondary side terminals, and each connected to the connection bar, A connection structure between a main breaker and a branch breaker that is connected via three plate-shaped main bars that are arranged side by side with a predetermined interval in the thickness direction,
While the main bar of one of the main bars is a straight belt,
The other two main bars are bent so that both ends of the straight belt-shaped metal plate protrude at an angle of 90 ° in the same direction with respect to the straight portion, thereby forming a bent portion overlapping in the thickness direction. And the length in the longitudinal direction is the same as the straight belt-shaped main bar,
The main bars are overlapped with each other in the thickness direction at a predetermined interval so that the straight belt-shaped main bar and the straight portion of the bent main bar are parallel to each other, and the bent main bars are attached to each other. As the reverse of the front and back, the bent part protrudes in the opposite direction from the overlapped part,
The connection bar is coupled to the end of the straight main bar and the end of the bent part of the bent main bar , respectively.
A plurality of screw holes for connecting the connection bar are drilled at the end of the bent portion, and screw holes used for connecting the connection bar according to the interval of the secondary side terminal in the main breaker. A connecting structure between the main breaker and the branch breaker, which is selectable, and further, after the connection of the connection bar, an excessively protruding portion of the bent portion is cut .

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