JPH0321122Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a control center in which control units for controlling electric motors and the like are stacked in multiple stages, and particularly relates to the bus bar configuration thereof.

[Prior art and its issues]

FIG. 8 shows an outline of the busbar configuration of the control center, in which numeral 1 is a box of the control center and two sides thereof are arranged side by side. Reference numeral 2 denotes a plurality of control units housed in the front and rear surfaces.
Reference numeral 3 denotes a horizontal busbar disposed astride between the control centers arranged in a row. Reference numeral 4 denotes a vertical bus bar disposed in the center of the box, and 5 a connecting conductor connecting the horizontal bus bar and the vertical bus bar. Reference numeral 6 designates the plug connection device provided in each control unit. Conventionally, conductors with a rectangular cross section are used for both the horizontal busbar and the vertical busbar, and the horizontal busbar has three phases arranged side by side in the front-rear direction, and the vertical busbar has three phases arranged side by side in the left-right direction. Moreover, since the plug-in connection device is inserted into the vertical busbar from the front and back, its rectangular cross section is arranged at right angles to the longitudinal direction of the horizontal busbar. Therefore, in order to connect the vertical bus bar to the horizontal bus bar, it was necessary to twist the bus bar 90 degrees, and the configuration was complicated. In addition, since the current capacity of the vertical busbar is changed by changing the width of the busbar, if the capacity is small or large, it is necessary to insert a plug-in connection device from the rear, or if there is a problem with the busbar support device. This also caused problems regarding the strength of the electromagnetic force between the busbars. In order to improve this problem, it has been proposed to use a vertical generatrix having a Z-shaped cross section, as shown in Japanese Utility Model Publication No. 59-26738. The busbar configuration will be explained with reference to FIGS. 9 to 12. 3 is a horizontal generatrix, which is the same as that shown in FIG.
4 is a vertical bus bar, which is roll-formed from a strip of conductive material so that its cross section is approximately Z-shaped;
42 is a short leg that is bent from one end of the middle part at right angles to the front side and then folded back inward from the middle. 43 is a short leg part that is bent at right angles to the rear side from the other end of the middle part and further inward. The long legs are folded back. The tip of each leg forms a flattened ellipse and engages with a contact 61 of the plug-in connection device 6. 21 is a part of the control unit case to which the plug connection device 6 is attached. Reference numerals 5A and 5B denote connection conductors having a rectangular cross section, which are fastened to an intermediate portion 41 between the horizontal busbar 3 and the vertical busbar by bolts 8 and nuts 9. The longitudinal direction of the horizontal generatrix 3 and the intermediate portion 41 of the vertical generatrix are parallel. The longitudinal position of the intermediate portion 41 of the vertical busbar is determined by arranging the short leg portion 42 of the vertical busbar on the front side and the long leg portion 43 on the rear side, so that the connecting conductor attached to the intermediate portion 41 is placed on the vertical busbar. It is biased so that it is centered in the longitudinal direction. The connecting conductor reaches from the horizontal busbar 3 to the vertical busbar 4 as shown at 10A and 10B in FIG. It is tightened and integrated with the vertical generatrix using bolts 12. In the busbar configuration as described above, the strength against electromagnetic force between the busbars increases due to the cross-sectional effect, and since the connecting conductor is connected along the middle part of the vertical busbar, the current capacity increases, and the actual External dimensions can always be unified to the minimum dimensions. In the above busbar configuration, since a common vertical busbar is used on the front and rear sides of the control center, the phase order of the busbars is reversed between the front and rear sides, and the specifications of the units are different. could not be shared. The structure of the vertical bus bar that solved this problem and made it possible to share the unit was developed in 1983.
It is disclosed in Publication No. 83906. This publication discloses the structure of a vertical bus bar that can share a unit, but how should the horizontal bus bar and vertical bus bar be connected so that the phase order is the same when viewed from the insertion side on the front side and the rear side? There is no mention or suggestion as to whether units can be shared. In addition to the above-mentioned connection structure between the horizontal bus bar and the vertical bus bar, there is also a structure in which the vertical bus bar is connected to the horizontal bus bar by twisting it.
It is disclosed in the No. However, this connection structure has the following problems. (1) The vertical busbar has a length of approximately 2m. Bending such a long object is more troublesome to process and handle than short objects, and the pressurization cost and storage cost increase accordingly. Furthermore, since it is inconvenient to handle, there is also a problem in ensuring machining accuracy. (2) Standardization of parts is a requirement of the times in order to provide products of constant quality at low prices. In the case of the vertical generatrix described in the above publication, it is necessary to manufacture a plurality of types of long vertical generatrixes with complicatedly different bending shapes, which goes against the demands of the times. (3) Since the vertical busbar of a long item is heavy and is bent in a complicated manner, installation work in the narrow space of the control center is troublesome and time consuming. Note that this publication discloses a device in which the vertical generatrix is not processed and the horizontal generatrix is bent.
Standardization of parts seems possible at first glance, but it is far from being sufficient. In other words, the control center itself is generally standardized, and therefore the capacity of the vertical busbars is also generally standardized. However, the capacity of the horizontal bus bar that sends current to the vertical bus bar varies depending on the number of sets of control centers, and as the number of sets increases, it is necessary to allow a correspondingly larger amount of current to flow. In such cases, the capacity can be increased by stacking the plates that make up the horizontal generatrix, but when folded plates of the same shape are stacked, they may shift slightly due to the overlapping parts of the bending process. This occurs and the shape also changes, so it is necessary to prepare horizontal busbar plates with slightly different shapes, and there is a problem that it is not possible to standardize the parts.

[Purpose of invention]

An object of the present invention is to provide a control center that uses a common horizontal busbar and has the same phase order of vertical busbars on the front side and rear side when viewed from the insertion side, so that a common unit can be used. It is in. Another purpose of the present invention is to make it possible to use the same shape for the vertical bus bar and the horizontal bus bar, which are the main and large components, and to use multiple connecting conductors, which are the small components that connect the horizontal bus bar and the vertical bus bar. The purpose of the present invention is to provide a control center that standardizes parts as a whole by performing different bending processes. Furthermore, another object of the present invention is to make the phase order of the vertical busbars the same and to make it possible to use a common unit, which requires a troublesome bending process. To provide a control center that reduces bending processing costs and storage costs by concentrating on a conductor, contributes to improved processing accuracy by simplifying handling, and is easy to install in a narrow space. There is a particular thing.

[Structure of the idea]

The structure of the invention devised to achieve the above purpose is as follows. That is, the present invention provides a control center that is equipped with a horizontal busbar and a vertical busbar inside a box body, and has unit chambers arranged on both the front and rear sides. Both sides of the L-shaped cross section are folded and overlapped in a part of the longitudinal direction, and the direction of the overlapping part is angled so that it is located in the middle of both sides of the L-shaped cross section to form a connection part. A plurality of the horizontal busbars are arranged in parallel on the box, and the vertical busbar is placed on the front side of the box with one side facing the plug-in connection device of the control unit. and the rear side, and the vertical busbar is electrically connected to each horizontal busbar via a connecting conductor so that the phase order is the same when viewed from the insertion side on the front and rear sides. The connecting conductor is a control center which is bent so that a common unit can be used on the front side and the rear side.

[Effect]

Since the vertical bus bars on the front side and the rear side of the control center can be provided separately and configured symmetrically, the phase order on the front side and the rear side is the same, making it possible to unify the unit specifications and provide compatibility. Furthermore, the space factor of the bus bar can be reduced, the distance between phases can be shortened, and the control center can be made more compact overall, and it has the cross-sectional strength to withstand electromagnetic force in the event that an accidental large current flows through the bus bar. can.

【Example】

The present invention will be explained in more detail below based on embodiments shown in the drawings. Figure 1 is a plan view showing the main parts;
Figure 2 is a side view showing the main parts, Figure 3 is an exploded perspective view showing the arrangement of horizontal busbars, vertical busbars, and connection conductors, Figure 4 is a plan view of the vertical busbars, and Figure 5 is the control center. 6 is a partially cutaway side view of FIG. 5, and FIG. 7 is a sectional view taken along the line - in FIG. 5. In these figures, 1 is a control center box, which corresponds to one side of the row of panels. Reference numeral 2 denotes a plurality of control units housed in the front and rear surfaces. Reference numeral 3 denotes a horizontal busbar disposed across control centers arranged in a row. Although it is arranged at the upper part of the box body 1 in the same figure, it may be arranged at the lower part if necessary. Reference numeral 4 denotes a vertical bus bar disposed in the center of the box, and 5 a connecting conductor connecting the horizontal bus bar and the vertical bus bar. Reference numeral 6 designates a plug connection device provided in each control unit. The horizontal bus bar uses a flat conductor with a rectangular cross section, and the three phases (3R, 3S, 3T) are arranged side by side in the front and back direction, and a large space is taken in the center of the plane of the box. Vertical busbars for each of three phases are arranged side by side in the left-right direction on the front side and the rear side, respectively. Since the plug connection device is inserted into the vertical busbar 4, one side of its L-shaped cross section is arranged at right angles to the longitudinal direction of the horizontal busbar. Further, at the connection portion between the connecting conductor 5 that connects the vertical bus bar 4 to the horizontal bus bar 3 and the vertical bus bar 4, the connection surface is inclined with respect to the longitudinal direction of the horizontal bus bar 4, that is, with respect to the parallel direction of the vertical bus bar 4. The cross section of the vertical generatrix 4 is formed into an L-shape consisting of a long side 4a and a short side 4b, and the terminal part thereof is formed as a connecting part 4c by folding and pressing the long side 4a and short side 4b until they overlap. do. This connecting part 4c is located in the middle between the long side 4a and the short side 4b of the L shape,
It is inclined with respect to the long side 4a. The connecting conductors 5 [each phase (5R, 5S, 5T) on the front side, each phase (5R', 5S', 5T') on the connection side] are made as short as possible by the arrangement of the horizontal busbar 3 and the vertical busbar 4. They are formed so that they can be easily connected to each other across distances, but the shapes differ for each phase. Its shape is represented in FIG. That is, among the connecting conductors, 5S, 5S', 5T, 5
Since there is no other phase between the horizontal generatrix 3 and the vertical generatrix 4, T' is formed simply by bending, especially 5T
and 5T' are integrally formed in this case. 5R,
Since 5R' has an S phase in the middle, the shape becomes complicated in order to avoid it. 5R and 5
R′ has a roughly similar shape. FIG. 3 shows an example of 5R. To explain this, the connection conductor 5R extends from the connection part 5Ra with the horizontal busbar 3 to the falling part 5Rb and the transverse part 5.
Rc, connection part 5 with vertical bus bar 4 via torsion part 5Rd
Leading to Re. As described above, the connection portion 5Re has an inclination angle with respect to the longitudinal direction of the horizontal busbar 3, that is, the parallel direction of the vertical busbars 4, and is connected to the connection portion 4c of the vertical busbar, which also has an inclination angle with respect to the horizontal busbar 3. be done.
In this case, the angle of inclination is approximately 30 degrees with respect to the insertion direction of the plug-in connection device, that is, the direction perpendicular to the longitudinal direction of the horizontal busbar 3.

[Effect of the idea]

The present invention has the above configuration and has the following effects. (1) The vertical busbars are formed into an L-shaped cross section, and a plurality of vertical busbars are provided on each of the front and rear sides of the box with one side facing the direction of the plug-in connection device of the control unit. is electrically connected to each horizontal bus bar via a connecting conductor so that the phase order is the same on the front side and the rear side when viewed from the insertion side, and the connecting conductor is connected on the front side and the rear side. It is bent so that a common unit can be used. Therefore, the control unit specifications can be unified and compatible. (2) The horizontal generatrix is formed into a flat plate shape, and the vertical generatrix is formed into an L-shaped cross section, and in a part of the longitudinal direction, both sides of the L-shaped cross section are folded and overlapped. There is a way to form a connecting part by setting the direction of the part at an angle so that it is located in the middle of both sides of the L-shaped cross section. The connecting conductor connecting the horizontal bus bar and the vertical bus bar is bent so that a common unit can be used. For this reason, the same shape can be used for the vertical and horizontal busbars, which are the main and large parts, and it is only necessary to bend the connecting conductors, which are small parts, in multiple types, thereby standardizing the parts as a whole. Can be done. (3) Since the troublesome bending process to enable the use of a common unit on the front and rear sides has been consolidated into a small component, the connecting conductor, bending process costs and storage costs can be reduced. Furthermore, since it is easy to handle, it can contribute to improving processing accuracy, and it is also easy to install in a narrow space. (4) The connection part between the vertical busbar and the connecting conductor is formed by overlapping both sides of the L-shaped cross section, and the direction is set at an angle so that it is located in the middle of both sides, so the connection part of the connecting conductor is Bolts can be tightened at an angle with respect to the parallel direction of the busbars, making it easier to maintain the spacing between the bolts and nuts of each phase connection, and vertical busbars can be placed in narrow spaces, reducing space factors. Can be made smaller. (5) It is possible to increase the rigidity of the entire vertical bus bar, including the L-shaped section of the vertical bus bar and the connection part where the L-shaped section section is folded and overlapped, and the cross-sectional area is also maintained. The rigidity against the electromagnetic force acting between the vertical bus bars and its surroundings can be prevented from being damaged when a short circuit current flows, and the current carrying capacity can also be increased.

[Brief explanation of drawings]

Figure 1 is a plan view showing the main parts, Figure 2 is a side view showing the main parts, Figure 3 is an exploded perspective view showing the arrangement of horizontal busbars, vertical busbars, and connection conductors. A plan view of the vertical busbar, FIG. 5 is a front view of the control center box, FIG. 6 is a partially cutaway side view of FIG. 5, FIG. 7 is a sectional view taken along the line - in FIG. 5, and FIG. is a schematic explanatory diagram of the busbar configuration of a control center, FIG. 9 is a front view showing the busbar configuration of a conventional control center, and FIG. 10 is a side view thereof.
FIG. 11 is a plan view thereof, and FIG. 12 is a schematic explanatory diagram of a bus bar configuration showing another conventional embodiment. 1: Box body, 2: Control unit, 3: Horizontal bus bar,
4: Vertical busbar, 4a: Long side, 4b: Short side, 5: Connection conductor, 5Ra: Connection part with horizontal busbar, 5Rb: Falling part, 5Rc: Transverse part, 5Rd: Swing part, 5
Re: Connection with vertical busbar, 6: Plug-in connection device.

Claims (1)

[Scope of Claim for Utility Model Registration] In a control center that is equipped with a horizontal busbar and a vertical busbar in a box body, and unit chambers are arranged on both the front side and the rear side, the horizontal busbar is formed into a flat plate and has an L-shaped cross section; The connecting portion is formed by folding both sides of an L-shaped cross section in a part of the longitudinal direction and overlapping both sides, and making an angle so that the direction of the overlapping part is located in the middle of both sides of the L-shaped cross section. and a vertical busbar formed with; a plurality of the horizontal busbars are arranged in parallel on the box body, and the vertical busbar is mounted on the box body with one side thereof facing the direction of the plug-in connection device of the control unit. The vertical busbar is electrically connected to each horizontal busbar via a connecting conductor so that the phase order is the same on the front and rear sides when viewed from the insertion side. 1. A control center characterized in that the connection conductor is bent so that a common unit can be used on the front side and the rear side.