JP2001186639A - Method of manufacturing a branching bar and a branching bar manufactured with the same method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a branching bar which may be allocated in the higher density with effective use of narrow space while keeping the insulation distance from conductor of different magnetic pole and moreover may be manufactured with rather small size punching metal dies with less non-effective use of the material. SOLUTION: A belt type conductive material of the specified width having the predetermined cross-section area determined from a current density is cut in the predetermined size, while forming a bus connecting part 11a and a branching circuit breaker 11b in order to form the primary part 11, and an escaping part is formed to the body 11c of the primary part 11 through the squeezing process. Moreover, the vertical bending process is executed as required at the boundary part of the bus connecting part 11a and body 11c and at the boundary part of the branching circuit breaker 11b and body 11c, and the lateral bending process is also executed to the escaping part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a branch bar for guiding electric power from a bus to a branch breaker in a distribution board, and to a branch bar manufactured by the method.

[0002]

2. Description of the Related Art FIG. 11 is a perspective view showing a state in which a bus bar and an input section of a branch breaker are connected using a conventional branch bar.

[0003] Three (three-phase) buses 31, 3 extending in parallel
The input unit 35 of the branch breaker 34 is arranged in parallel to the input breakers 2 and 33. The input section 35 of the branch breaker 34 includes a plurality of terminals 35a to 35d, each of which is connected to the branch bar 3.
6 is connected to any of the three buses 31, 32, 33. One end side of branch bar 36 (bus connecting portion) 3
Reference numeral 6a is screwed to the bus bar, and the other end (branch breaker connection portion) 36b is screwed to a terminal of an input portion of the branch breaker. Although not shown in FIG. 11, the buses 31,
Another branch breaker is arranged so as to face the branch breaker 34 with 32 and 33 interposed therebetween.

A branch bar used for connecting the bus and the input of the branch breaker as described above has a flat bus connection and a branch breaker connection at both ends, and a central body has an adjacent different pole. In order to secure an insulation distance from the conductor, it is preferable that the distance is as small as possible. However, it is necessary to secure a cross-sectional area that satisfies the required current density.

[0005] In addition, there is a demand for a branch bar that enables high-density arrangement by effectively utilizing a narrow space while securing an insulation distance from an adjacent different-polarity conductor. Therefore, it is necessary to prepare a branch bar having various shapes that are meandering both planarly and three-dimensionally.

[0006]

Conventionally, as shown in FIG. 11, the outer shape is cut out from a plate-like material such as a thick copper plate by using an outer shape cutting die corresponding to such a meandering shape. Such a bar-shaped branch bar has been manufactured. Therefore, many losses occur in the material. In addition, the outer shape removing die becomes large and complicated. As a result, there is a problem that the manufacturing cost of the branch bar increases.

The present invention solves the above-mentioned conventional problems, and enables high-density arrangement by effectively utilizing a narrow space while securing the insulation distance from the different-polarity conductor, and furthermore, the waste of material is small. It is another object of the present invention to provide a method of manufacturing a branch bar that can be manufactured with a relatively small punching die.

[0008]

According to a first method of manufacturing a branch bar according to the present invention, a flat bus bar connecting portion connected to a bus bar is provided at one end, and a flat branch bar connected to an input portion of a branch breaker is provided. A method of manufacturing a branch bar including a breaker connection portion on the other end side, a relief portion for securing an insulation distance from an adjacent different-polarity conductor in a body portion, and guiding power from a bus to an input portion of a branch breaker. And forming a primary part by cutting a strip-shaped conductive material having a predetermined cross-sectional area determined by a current density into a predetermined size while forming a bus bar connection part and a branch breaker connection part, and forming a trunk part of the primary part. A relief portion is formed by drawing.

According to such a manufacturing method, a relatively thin strip-shaped conductive material having a predetermined width is cut into a predetermined size, instead of punching out the outer shape of a bar-shaped branch bar from a thick plate-like material as in the related art. Since the branch bar composed of the busbar connection part, the branch breaker connection part and the body part is formed, a conventional large-sized die-cutting die is not required, and a small-sized die for forming the busbar connection part and the branch breaker connection part is unnecessary. A partial mold is sufficient. Therefore, die costs are reduced. Also, material loss is reduced.

Further, since the relief portion is formed in the body by drawing, the insulation distance between the adjacent conductors of different polarity is secured while substantially maintaining the initial cross-sectional area (predetermined current density) of the strip-shaped conductive material. be able to.

According to a second method of manufacturing a branch bar according to the present invention, a flat bus connection portion connected to a bus bar is provided at one end, and a flat branch breaker connection portion connected to an input portion of a branch breaker is provided at the other end. A method of manufacturing a branch bar provided on the side and provided with a relief portion on the body portion for securing an insulation distance between adjacent different-polarity conductors, and furthermore, bent at the relief portion to guide power from the bus to the input portion of the branch breaker. And forming a primary part by cutting a band-shaped conductive material having a predetermined cross-sectional area determined by a current density into a predetermined size while forming a bus connection part and a branch breaker connection part. It is characterized in that a relief portion is formed by subjecting the body portion to a drawing process so as to become thinner in the bending direction, and the relief portion is bent at the relief portion.

According to such a manufacturing method, in addition to the first manufacturing method, the relief portion is formed so as to be thin in the bending direction by drawing, so that excessive stress is applied to the body portion and the crack is generated. The body part (relief part) can be bent with a relatively small force and high accuracy without causing any problem.

A first configuration of the branch bar according to the present invention is characterized in that a flat bus connecting portion connected to a bus is provided at one end, and a flat branch breaker connecting portion connected to an input portion of the branch breaker is provided. A branch bar that is provided on the end side and has a relief portion on the body to secure an insulation distance between adjacent different-polarity conductors, and guides power from the bus bar to the input portion of the branch breaker. A band-shaped conductive material having a predetermined width having an area is cut into a predetermined size while forming a busbar connection portion and a branch breaker connection portion to form a primary part, and a relief portion is formed in the body of the primary part by drawing. It is characterized by becoming.

In a second configuration of the branch bar according to the present invention, a flat bus connection portion connected to the bus bar is provided at one end, and a flat branch breaker connection portion connected to the input portion of the branch breaker is provided at the other end. In the branch bar, a relief portion for securing an insulation distance between adjacent different-polarity conductors is provided in the body portion, and furthermore, the branch bar is bent at the relief portion and guides electric power from the bus to the input portion of the branch breaker, A band-shaped conductive material having a predetermined cross-sectional area determined by a current density is cut into a predetermined size while forming a bus connection portion and a branch breaker connection portion to form a primary part. The relief portion is formed by performing a drawing process so as to become thinner in the bending direction, and is bent at the relief portion.

Further, it is preferable to use an easily bendable copper material as the belt-shaped conductive material. For example, two branch bars may be connected to a bus in a state where bus connection portions are overlapped in order to guide power to input portions of breakers symmetrically arranged with respect to the bus. In such a case, the height of the branch bar at which the bus bar connection portion is at the top is displaced by the thickness of the bus bar connection portion of the branch bar at the bottom, so the branch bar is deformed by that amount and connected to the input portion of the breaker. However, a branch bar manufactured using a copper-brought material can easily cope with position adjustment due to such deformation.
Therefore, the branch bars having slightly different connection heights can be shared, and the types of branch bars to be prepared can be reduced.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show a manufacturing process of a branch bar according to an embodiment of the present invention. In each figure,
(A) is a plan view and (b) is a side view.

First, as shown in FIG.
Is cut into a predetermined length to form a primary part 11. The strip-shaped conductive material 10 is preferably made of a copper-bending material that is easily bent. Further, the width is determined so as to have a thickness that is easy to process and a cross-sectional area that satisfies a required current density. Such a strip-shaped conductive material 10 is generally available in the form of a copper busbar or a roll material. A cutout portion, which is connected to the bus by screwing, is formed at one end of the primary component 11, that is, a bus connecting portion 11a, and a branch having a screw hole connected to the input of the branch breaker is formed at the other end. The breaker connection part 11b is formed. The busbar connection portion 11a and the branch breaker connection portion 11b are formed at the same time when the strip-shaped conductive material 10 is cut into the primary parts 11 by, for example, punching. In this case, the punching die does not have to be a conventional large-sized die cutting die but a small cutting die.

Next, as shown in FIG. 2, in order to form a relief portion in the body portion 11c of the primary part 11, a first stage drawing process is performed to make a sectional shape U-shaped.

Further, as shown in FIG. 3, the U-shaped cross section of the body 11c is crushed so that it becomes flat in the direction perpendicular to the surfaces of the busbar connection portion 11a and the branch breaker connection portion 11b (ie, the original plate-like surface). Process into As a result, the bus connecting portion 11
This makes it easier to apply a bending process to the body 11c in a direction parallel to the surface of the a and the branch breaker connecting portion 11b (see FIG. 5). In addition, since the thickness of the body portion (relief portion) 11c in a direction perpendicular to the original plate-like surface is thinner than that of the conventional bar-shaped branch bar, the thickness of the body and the different pole conductor adjacent to each other in the state of being attached to the breaker and the busbar are reduced. It is easy to secure the insulation distance.

In the next step shown in FIG. 4, in the line connecting portion 11a
A bending process is performed in the vertical direction on the boundary between the body and the body 11c. Similarly, the boundary between the branch breaker connection portion 11b and the trunk portion 11c is also bent in the vertical direction. As a result,
As can be seen from FIG. 4 (b), the surface of the busbar connection portion 11a and the surface of the branch breaker connection portion 11b are separated by a predetermined distance (height) while maintaining parallelism.

Finally, in the step of FIG. 5, the body 11c is subjected to a lateral bending process. Since the body portion 11c is flattened in a direction perpendicular to the original plate-like surface by the drawing process shown in FIGS. 2 and 3, the body portion 11c can be easily bent in the lateral direction along the original plate-like surface. As a result, as can be seen from FIG. 5 (a), the surface of the bus connecting portion 11a and the branch breaker connecting portion 1
1b, the axis AX1 of the busbar connection 11a and the branch breaker connection 11
b has a predetermined angle with the axis AX2.

As described above, the final branch bar 12 is manufactured from the strip-shaped conductive material 10 through the primary component 11.
Note that the manufacturing steps shown in FIGS. 1 to 5 and the shape of the branch bar 12 manufactured by the manufacturing steps are merely examples. By the same process, for example, as shown in FIGS.
Branch bars of various sizes and shapes can be manufactured.

The manufacturing process of the branch bar 13 shown in FIG. 6 does not include the process shown in FIG. 4, and the surface of the busbar connecting portion 13a and the surface of the branch breaker connecting portion 13b are located on the same plane (same height). are doing.

In the manufacturing process of the branch bar 14 shown in FIG.
In a process corresponding to FIG.
The boundary between b and the trunk 14c is not bent vertically. Instead, the busbar connection portion 14a and the trunk portion 14
Steps are formed in this portion by performing a bending process twice in the vertical direction on the boundary portion with c. As a result, the surface of the bus connecting portion 14a and the surface of the branch breaker connecting portion 14b are separated from each other by a predetermined distance (height) while maintaining parallelism.

In the manufacturing process of the branch bar 15 shown in FIG.
In the process corresponding to FIG. 4, the boundary between the busbar connection portion 15 a and the trunk portion 15 c and the boundary between the branch breaker connection portion 15 b and the trunk portion 15 c are each subjected to two vertical bending processes to perform the bending process. Forming steps. As a result, the surface of the bus connecting portion 15a and the branch breaker connecting portion 1
A predetermined distance (height) while maintaining the plane 5b in parallel
And the trunk (escape portion) 15c is
5a and the branch breaker connection portion 15b. Further, in this branch bar 15,
As shown by the broken line, the body 15c is covered with a heat-shrinkable tube. Due to the insulating effect of the heat-shrinkable tube, the branch bar 15 can be used in an application in which a different-polarity branch bar is arranged adjacent to a narrower space.

In the manufacturing process of the branch bar 16 shown in FIG.
In the process corresponding to FIG. 2 and FIG. 3, a part of the body part 16a (substantially half of the branch breaker connection part 16b side), not the whole part, has a cross-sectional shape that is vertically elongated from a U-shaped cross-section by drawing. An escape portion is formed. Further, FIG.
Bus bar connecting portion 16a and trunk portion 16
Steps are formed by performing two bendings in the vertical direction on each of the boundary portion with the branch breaker connecting portion 16b and the trunk portion 16c. Further, a heat-shrinkable tube is covered on the cross-section deformed portion of the body 16c as shown by a broken line. As in this example, the relief portion formed by drawing may be formed not on the entire body but on a part thereof.

In addition to the modifications shown in FIGS. 6 to 9, branch bars of various shapes and dimensions can be manufactured by the manufacturing method of the present invention.

FIG. 10 is a sectional view showing an example of a state in which the bus bar and the input section of the branch breaker are connected by using various branch bars as described above. Parallel and three-dimensional,
Three (three-phase) buses 21 and 2 extending in a direction perpendicular to the paper surface
A pair of branch breakers 24 and 25 are arranged so as to sandwich the pair 2 and 23. In FIG. 10, a branch bar 26 connects the bus 21 to one terminal of the input unit of the branch breaker 25, a branch bar 27 connects the bus 22 to one terminal of the input unit of the branch breaker 24, and a branch bar A branch bar 28 connecting one terminal of the input part of the breaker 24 is shown.

As shown in FIG. 10 used in the description of the prior art, a plurality of branch bars are arranged along the longitudinal direction of buses 21, 22, 23 (the direction perpendicular to the plane of FIG. 11). If the branch breaker connection is a branch breaker 24 or 2
5 are connected to the corresponding terminals of the input section.

The present invention is not limited to the above embodiments and modifications, but can be implemented in various forms.

[0032]

As described above, according to the present invention, a relatively thin strip-shaped conductive material having a predetermined width is cut into a predetermined size to form a branch bar comprising a busbar connection portion, a branch breaker connection portion, and a trunk portion. Therefore, a large-sized die for removing the external shape as in the related art is not required, and a small partial die for forming the busbar connection portion and the branch breaker connection portion is sufficient. Therefore, die costs are reduced. Also, material loss is reduced. Furthermore,
Since the relief portion is formed in the body by drawing, it is possible to secure an insulation distance between adjacent different-polarity conductors while substantially maintaining the initial cross-sectional area (predetermined current density) of the strip-shaped conductive material. Further, it becomes easy to bend in the horizontal direction at the relief portion deformed into a vertically long cross section by drawing.

[Brief description of the drawings]

FIG. 1 is a view showing a cutting step in a branch bar manufacturing process according to an embodiment of the present invention.

FIG. 2 is a view showing a U-shaped cross-section forming step in the manufacturing process of the branch bar according to the embodiment of the present invention.

FIG. 3 is a view showing a cross-section crushing step in the manufacturing process of the branch bar according to the embodiment of the present invention.

FIG. 4 is a view illustrating a vertical bending step in the manufacturing process of the branch bar according to the embodiment of the present invention.

FIG. 5 is a view illustrating a lateral bending step in the manufacturing process of the branch bar according to the embodiment of the present invention.

FIG. 6 is a view showing a branch bar according to a first modification of the embodiment of the present invention.

FIG. 7 is a view showing a branch bar according to a second modification of the embodiment of the present invention.

FIG. 8 is a view showing a branch bar according to a third modification of the embodiment of the present invention.

FIG. 9 is a view showing a branch bar according to a fourth modification of the embodiment of the present invention.

FIG. 10 is a cross-sectional view showing an example of a state in which a bus bar and an input unit of a branch breaker are connected using the branch bar according to the embodiment of the present invention.

FIG. 11 is a perspective view showing a state where a bus bar and an input section of a branch breaker are connected using a conventional branch bar.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Band-shaped conductive material 11 Primary components 12, 13, 14, 15, 16 Branch bar 11a, 13a, 14a, 15a, 16a Busbar connection part 11b, 13b, 14b, 15b, 16b Branch breaker connection part 11c, 13c, 14c, 15c , 16c Trunk 21, 22, 23 Bus bar 24, 25 Branch breaker 26, 27, 28 Branch bar

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Kondo 1048 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Works, Ltd. (reference) 5G030 EA02 XX20 5G365 AA02 AC03 AD06

Claims (5)

[Claims] 1. A flat busbar connection portion connected to a bus bar is provided on one end side, and a flat branch breaker connection portion connected to an input portion of a branch breaker is provided on the other end side. A method of manufacturing a branch bar having an escape portion for securing an insulation distance in a body portion and guiding power from a bus bar to an input portion of a branch breaker, comprising: a strip-shaped conductive material having a predetermined cross-sectional area determined by a current density. A primary part is formed by cutting into predetermined dimensions while forming a busbar connection part and a branch breaker connection part, and a relief part is formed in the body part of the primary part by drawing. Production method. 2. A flat busbar connection portion connected to a bus bar is provided on one end side, and a flat branch breaker connection portion connected to an input portion of the branch breaker is provided on the other end side. A method of manufacturing a branch bar provided with a relief portion for securing an insulation distance in a body portion and bent at the relief portion to guide power from a bus bar to an input portion of a branch breaker, wherein a predetermined cross-sectional area determined from a current density is provided. A band-shaped conductive material having a predetermined width is cut to a predetermined size while forming a busbar connection portion and a branch breaker connection portion to form a primary part, and the body of the primary part is thinned in the bending direction. A method of manufacturing a branch bar, comprising forming a relief portion by drawing, and bending at the relief portion. 3. A flat busbar connecting portion connected to a bus bar is provided at one end, a flat branch breaker connecting portion connected to an input portion of the branch breaker is provided at the other end, and a flat bus breaker connecting portion is provided. A branch bar provided with a relief portion in the body to secure an insulation distance, and for guiding electric power from the bus to an input portion of the branch breaker, wherein a bus-shaped conductive material having a predetermined cross-sectional area having a predetermined cross-sectional area determined by a current density is provided. A branch bar formed by forming a primary part by cutting to a predetermined size while forming a connection part and a branch breaker connection part, and forming a relief part by drawing in a body part of the primary part. 4. A flat bus breaker connecting portion connected to a bus bar is provided on one end side, and a flat branch breaker connecting portion connected to an input portion of the branch breaker is provided on the other end side, and the flat branch breaker connecting portion is connected to an adjacent heteropolar conductor. A branch bar provided with a relief portion for securing an insulation distance in the body portion, and further bent at the relief portion, for guiding power from the bus bar to the input portion of the branch breaker, and having a predetermined cross-sectional area determined by a current density. The width of the strip-shaped conductive material is cut into a predetermined size while forming a busbar connection portion and a branch breaker connection portion to form a primary part, and a drawing process is performed on the body part of the primary part so as to be thin in the bending direction. A branch bar formed by forming a relief portion by applying the bent portion. 5. The branch bar according to claim 3, wherein a copper-clad material is used as the strip-shaped conductive material.