JP2015072790A - Conductor connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply-configured and inexpensive conductor connection device capable of bolt-fastening a plurality of bus bars, while achieving diversification of a service voltage and miniaturization.SOLUTION: A conductor connection device comprises a connection conductor 1. In the connection conductor 1, a conductor 11 with a predetermined length, which is provided with a connection part 11b for being connected to another conductor 3 fixed by a fastening bolt 2, and a bottomed cylinder-like box nut part 12, which is connected to an opening 11a formed in the connection part and in which a screw thread 12a for being screwed to the fastening bolt is formed on an inner peripheral part, are integrally formed of the same material.

Description

  The present invention relates to a conductor connecting device in which a connecting portion of a conductor such as a bus bar used in a power converter or the like and a cap nut portion are integrated.

  As a conventional technique, when electrically connecting a plurality of conductors such as bus bars by screw fastening, in addition to a general terminal block, for example, it is disclosed in Patent Document 1 below related to the prior application of the present applicant. Thus, as shown in FIG. 5B of the accompanying drawings of the present application, a nut portion 13 comprising a plurality of parts including a nut main body 13a, a nut body bottom cover 13b, and a flange 13c is connected to the connecting portion 11b at the end of the bus bar 11. Are integrated by resin molding.

Japanese Patent Application No. 2012-128523 ([0013] to [0016], FIGS. 1 to 5)

  In the conventional technology as described above, after preparing a plurality of members in which the bus bar 11 and the nut portion 13 are separate, resin molding is performed using a mold, so that the number of parts is inevitably high, and the manufacturing cost and management are inevitably large. There is a problem that the cost is increased because the cost is increased and the manufacturing is troublesome. Further, when it is necessary to reduce the height in order to meet the recent demand for miniaturization, there is a problem that it is difficult to earn the creeping insulation distance in the space 7 portion if the height is lowered.

  The present invention has been made to solve the above-described problems, and provides a conductor connection device that has a simple configuration and can be reduced in size even for diversified operating voltages and downsizing of resin molded products. It is intended to provide.

  The conductor connecting device according to the present invention is connected to a conductor having a predetermined length provided with a connecting portion with another conductor fixed by a fastening bolt, and an opening formed in the connecting portion, and the inner peripheral portion is connected to the inner peripheral portion. A bottomed cylindrical cap nut portion formed with a screw thread to be screwed into a fastening bolt is provided with a connection conductor integrally formed of the same material.

  According to the present invention, by providing the connection conductor in which the conductor having a predetermined length and the bottomed cylindrical cap nut portion are integrally formed of the same material, the configuration is simplified and the miniaturization and manufacture are easy. Thus, the effect of improving the insulation performance can be obtained.

It is a partial expanded perspective view which shows typically the principal part structure part in the use condition of the conductor connection apparatus which resin-molded the cap nut part of the conductor connection apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows roughly the principal part of the conductor connection apparatus which concerns on Embodiment 1 of this invention, (a) is a perspective view, (b) is arrow sectional drawing in the AA of FIG. 2 (a). It is. It is a figure explaining the state at the time of resin molding of the conductor connection apparatus which resin-molded the cap nut part shown by FIG. 1, (a) was pinched | interposed into the fixed side resin molding die and the movable side resin molding die Sectional drawing which shows a state, (b) is an arrow directional cross-sectional view in the BB line in Fig.3 (a). It is a figure explaining the creeping insulation distance in the use condition of the conductor connection apparatus which resin-molded the cap nut part shown by FIG. It is sectional drawing which shows notionally the height dimension of the conductor connection apparatus which resin-molded the cap nut part shown by FIG. 1 compared with the conventional one, (a) is implementation of implementation of this invention shown in FIG. In the case of the form 1, (b) is a case of a prior art example. It is principal part sectional drawing explaining the state when resin-molding the connection part which has a cap nut part of the conductor connection apparatus which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
FIG. 1 is a partially developed perspective view schematically showing a main part constituent part in a use state of a conductor connecting device in which a cap nut portion of a conductor connecting device according to Embodiment 1 of the present invention is resin-molded. FIG. It is a figure which shows roughly the principal part of the conductor connection apparatus which concerns on Embodiment 1, (a) is a perspective view, (b) is arrow sectional drawing in the AA line of Fig.2 (a). In addition, the same code | symbol shows the same or an equivalent part between each figure. In the figure, as shown in FIG. 2, the connection conductor 1 is inserted into the connection portion 11b formed with the fastening opening portion 11a formed at the end portion of the bus bar 11 as a conductor and the inner peripheral portion from the opening portion 11a. A bottomed cylindrical cap nut portion 12 formed with a thread 12a to be screwed to the fastening bolt 2 is integrally formed of the same material. The connecting portion 11b is bent in a step shape so as to be one step higher than the electric circuit portion 11c of the bus bar 11. The connecting portion 11b also has a flange function with respect to the cap nut portion 12.

  In addition, the material of the connection conductor 1 is not specifically limited, For example, generally used electrically-conductive materials, such as copper, aluminum, those alloys, can be used suitably. In this document, a portion excluding the connection portion 11b of the bus bar 11 is referred to as an electric circuit portion 11c for convenience. The cap nut portion 12 can be easily formed by, for example, forming a predetermined portion of a long linear body having the same shape as the electric path portion 11c of the bus bar 11 by drawing with a press, and then screwing a thread 12a on the inner peripheral portion. Can be formed. In addition, the connection portion 11b including the cap nut portion 12 is provided at both ends of the bus bar 11 formed to have a desired length, or is provided at an intermediate portion in the longitudinal direction of the bus bar 11, for example. One or more locations can be provided.

  The connection conductor 1 formed as described above can be used as it is for electrical connection as a conductor connection device. However, as illustrated in FIG. 1, a connection portion 11 b including a cap nut portion 12 is preferably used. As a conductor connection device 10 formed of a mold resin and provided with an insulating holding member 4, for example, as a terminal block for connection to a power module, a capacitor, or the like in a power conversion device (not shown), or to other bus bars 3, etc. Used. FIG. 1 schematically shows only the main configuration, and the conductor connecting device 10 is formed on the outside of the bottom 12b of the cap nut portion 12 excluding the surface of the connecting portion 11b in the connecting conductor 1 and the electric path portion 11c of the bus bar 11. , The back side of the connecting portion 11b and the stepped upper portion are integrally insert-molded with a casting resin using a resin molding die to be described later, and an insulating holding member is provided on the connecting portion 11b. 4 is provided.

  The bottom portion 12b of the cap nut portion 12 has a structure that is integrally covered with the insulating holding member 4 and is not exposed to the outside. Note that a side portion of the insulating holding member 4 is provided with a mounting portion having a mounting hole (not shown), and is fixed to the metal housing 5 as a mounting portion by a fixing screw (not shown). Used. In the example of FIG. 1, the portion that contacts the metal housing 5 of the insulating holding member 4 is a fixed portion. Moreover, although the conductor connection apparatus 10 which has only one connection conductor 1 is illustrated in FIG. 1, the conductor provided with the some connection part 11b by carrying out insert molding by mutually separating the some connection conductor 1 from each other. The connection device 10 can be obtained. One or more of the other bus bars 3 are fixed to the connecting portion 11b by the fastening bolts 2 and are electrically connected.

  Next, molding of the conductor connecting device 10 using a resin molding die will be described with reference to FIG. FIG. 3 is a view for explaining the state of resin molding of the conductor connecting device in which the cap nut portion shown in FIG. 1 is resin-molded. FIG. 3A is a diagram illustrating a fixed-side resin molding die and a movable-side resin molding die. Sectional drawing which shows the state pinched | interposed into the type | mold, (b) is an arrow directional cross-sectional view in the BB line in Fig.3 (a). In FIG. 3, for example, a plurality of connection conductors 1 (only one is shown in the figure) is set at a predetermined position of a fixed side resin molding die (referred to as a first die) 6A. The first mold 6 </ b> A is formed with a cylindrical convex portion 6 </ b> A <b> 1 having a dimension (outer diameter and height) that enters the inside of the cap nut portion 12 and the upper end surface comes into contact with the bottom portion 12 b of the cap nut portion 12. When set, the surface portion of the connecting portion 11b having the function of a flange and the inner surface portion of the bottom portion 12b of the cap nut portion 12 are simultaneously brought into contact with the upper surface side of the first mold 6A. In addition, the cross section of the cap nut part 12 is a cylinder or a rectangular tube shape, and the dimension of the connection part 11b is formed larger than the maximum outer dimension.

  Thereafter, when the movable side resin molding die (referred to as the second die) 6B is combined with the first die 6A, a plurality of protrusions projecting from the predetermined portion of the second die 6B toward the first die 6A. The front ends of the four leg portions 6B1 (here, four) are held at a position where the back portion of the connecting portion 11b is pressed. That is, the connection conductor 1 is held so that both front and back end faces of the connection portion 11b having a flange function are sandwiched between the first mold 6A on the fixed side and the second mold 6B on the movable side. Then, insert molding or outsert molding is performed using an insulating resin material.

  In the state where the connection conductor 1 is sandwiched as described above, a predetermined resin for filling the casting resin is provided between the lower surface of the second mold 6B and the outer surface of the bottom 12b of the cap nut portion 12. The length of the leg portion 6B1 is set to be larger than the length of the cap nut portion 12 so that a clearance gap is formed, and since the casting resin is filled in the separation portion, the outside of the bottom portion 12b of the cap nut portion 12 is It is covered with resin and never exposed. Therefore, unlike the conventional technique in which the portion corresponding to the bottom portion 12b of the cap nut portion 12 is separately formed and used, the portion corresponding to the bottom portion 12b of the conductor connection device is not exposed, and the cap nut portion 12 is exposed. As a result, the conductor connecting device 10 can be obtained in which the whole is integrally surrounded by resin. Needless to say, the resin mold may have a configuration in which the fixed side and the movable side are opposite to those in FIG.

  Next, the effect of Embodiment 1 comprised as mentioned above is demonstrated with reference to FIG.4 and FIG.5 other than FIGS. 1-3. 4 is a diagram for explaining the creeping insulation distance in the usage state of the conductor connecting device in which the cap nut portion shown in FIG. 1 is resin-molded, and FIG. 5 is a conductor in which the cap nut portion shown in FIG. 1 is resin-molded. It is sectional drawing which shows notionally the height dimension of a connection apparatus compared with a conventional one, (a) is the case of Embodiment 1 of this invention shown in FIG. 1, (b) is the case of a prior art example. is there. First, in the first embodiment, the connection conductor 1 shown in FIG. 2 has a bottomed cylindrical bag nut portion 12 as a nut portion to which the fastening bolt 2 in the connection portion 11b of the bus bar 11 is screwed. It is possible to prevent metal chips generated when a plurality of other bus bars 3 are fastened with the fastening bolts 2 from being scattered outside the cap nut portion 12, and since the cap nut portion 12 and the bus bar 11 are integrated, There is no need to consider preventing slipping or rotation.

  In addition, the conductor connecting device 10 shown in FIG. 1 in which the connecting portion 11b and the cap nut portion 12 are resin-molded is used when the bus bar 11 integrated with the cap nut portion 12 is set in a resin molding die during resin molding. The plate-like connecting portion 11b that also functions as a flange is held so as to be sandwiched between the tips of the first mold 6A on the fixed side and the leg portion 6B1 of the second mold 6B on the movable side. When the mold is removed, as shown in FIG. 4, a plurality of round hole-shaped cavities 7 (four in this case) are formed, and the back side of the connecting portion 11b is viewed from the side of the metal housing 5 that is the attached portion. It becomes an exposed portion C through the void 7. For this reason, in use, a space insulation distance and a creeping insulation distance L between the exposed portion C of the conductor connection device 10 and the metal housing 5 are generated. However, as is clear from the comparison between FIG. 5A and FIG. 5B, the insulation distance is equivalent to that according to Patent Document 1, and the prior art shown as the prior art of Patent Document 1 is used. As compared with the above, the operating voltage can be increased and the size can be reduced.

  As described above, according to the first embodiment, the connection conductor 1 includes the connection portion 11b in which the opening portion 11a for fastening in the bus bar 11 is formed, and the fastening bolt 2 that is inserted into the inner peripheral portion from the opening portion 11a. By forming the bottomed cylindrical cap nut portion 12 formed with the screw thread 12a to be screwed together with the same material, the structure is simplified, the size can be easily reduced, and the insulation performance is improved. Improvement can also be achieved, and the torque and axial thrust acting on the conductor can be sufficiently received, so that it is possible to flexibly deal with, for example, diversified power converters.

  In the conductor connecting device 10 in which the connecting conductor 1 in which the bus bar 11 and the cap nut portion 12 are integrated is insert-molded and the back surface of the connecting portion 11 b and the outer surface of the cap nut portion 12 are surrounded by the insulating holding member 4, The insulation performance between the metal casing 5 as the attachment portion can be greatly improved. Further, since the connecting portion 11b also functions as a flange, the surface pressure when the other bus bar 3 is fastened with the fastening bolt 2 is dispersed, and the contact resistance between the other bus bar 3 and the connecting portion 11b is reduced. It becomes possible. Further, as apparent from the comparison diagram of FIG. 5, the bus bar and the nut portion are integrated with each other as compared with the prior art bus bar 11 and the nut portion 13 which are separately molded with resin. It is possible to reduce the number of parts and reduce the cost.

Embodiment 2. FIG.
FIG. 6 is a cross-sectional view of an essential part for explaining a state when a connecting portion having a cap nut portion of a conductor connecting device according to Embodiment 2 of the present invention is molded by resin molding. In the second embodiment, as shown in FIG. 6, a movable side mold formed so that a gate G (resin injection port) is located near the center of the bottom 12b of the cap nut portion 12 as a movable side mold. Using the mold 6C, the connecting conductor 1A is set on the first mold 6A on the fixed side similar to that in FIG. 3 of the first embodiment and cast. Note that the connecting portion 11b of the connecting conductor 1A is formed so that the outer peripheral portion of the flange portion 11d is positioned inside the insulating holding member 4 formed of cast resin. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  In Embodiment 2 configured as described above, by providing the gate G at a position corresponding to the vicinity of the bottom 12b of the cap nut portion 12 of the movable mold 6C, the flange portion 11d is moved to the arrow at the time of resin molding. The resin is molded by pressing the first mold 6A on the fixed side with the molding resin pressure P acting in this direction. According to the second embodiment, except for the surface of the connecting portion 11b of the bus bar 11 in which the cap nut portion 12 is integrated, the insulating holding member 4 is completely covered with the resin, and the exposed portion of the connecting conductor 1A after the resin molding is Only the surface of the connecting portion 11b on the flange portion 11d side is provided. In the first embodiment, there is a creeping insulation distance L as shown in FIG. 4, but in this second embodiment, there is no such creeping insulation distance, and the exposed portion on the surface of the connection portion and the metal housing 3 are not present. Therefore, it is not necessary to substantially consider the space insulation distance and the creeping insulation distance. Therefore, better insulation characteristics can be obtained than the resin molded product of the first embodiment. Further, since the outer peripheral portion of the flange portion 11d is molded into the insulating holding member 4, the bonding strength with the insulating holding member 4 is increased.

Embodiment 3 FIG.
In this third embodiment, a resin molded body corresponding to an insulating holding member 4 in which a connecting conductor 1 having a bus bar 11 integrated with a cap nut portion 12 similar to that of the first embodiment shown in FIG. A conductor connecting device (not shown) in which the cap nut portion 12 is surrounded by an insulating molded body is obtained by being inserted into (not shown) and united.
According to the third embodiment, depending on the shape of the insulating holding member 4, when it is difficult to use the mold of the first or second embodiment, the connecting nut 1 is insulated by the insert nut molding 12 without using the insert molding. A conductor connecting device (not shown) surrounded by the material can be obtained, and the same effect as in the first embodiment can be obtained. Further, since the resin molding not shown in the figure can be made without the voids shown in FIG. 4, there is an advantage that the insulating characteristics are improved.

Embodiment 4 FIG.
In the fourth embodiment, the electric circuit portion 11c of the bus bar 11 of the conductor connecting device 10 in which the cap nut portion 12 of the connecting conductor 1 is surrounded by an insulating member, similar to the first and second embodiments shown in FIGS. A thin-leaf insulating material such as insulating paper, a resin film, a prepreg tape, a heat shrinkable tube, or the like is used to eliminate exposure of the charging part (not shown). The insulating coating for the electric circuit portion 11c of the bus bar 11 is applied after the insulating holding member 4 is provided on the connecting portion 11b having the cap nut portion 12 by insert molding or the method of combining in the third embodiment, or in advance. Alternatively, the insulating holding member 4 may be provided on the connection portion 11b having the cap nut portion 12 after providing an insulating coating (not shown) on the electric circuit portion 11c of the bus bar 11.

  According to the fourth embodiment, the same effects as those of the first to third embodiments can be obtained, and the entire conductor connection device 10 except for the surface of the connection portion is insulated by an insulating coating (not shown). In the test or use, the occurrence of short circuits and defective products can be prevented, and the safety can be improved.

  In the present invention, each embodiment can be appropriately modified or omitted within the scope of the invention. For example, the conductor is not limited to the bus bar 11.

  DESCRIPTION OF SYMBOLS 1 Connection conductor, 1A connection conductor, 10 Conductor connection apparatus, 11 Bus bar, 11a Opening part, 11b Connection part, 11c Electric circuit part, 11d Flange part, 12 Cap nut part, 12a Thread, 12b Bottom part, 2 Fastening bolt, 3 Other bus bars, 4 insulation holding members, 5 metal housing, 6A first mold, 6A1 convex part, 6B second mold, 6B1 leg part, 6C movable side mold, 7 voids, C exposed part, G gate, L Creeping insulation distance, P Molding resin pressure.

The conductor connecting device according to the present invention is connected to a conductor having a predetermined length provided with a connecting portion with another conductor fixed by a fastening bolt, and an opening formed in the connecting portion, and the inner peripheral portion is connected to the inner peripheral portion. A bottomed cylindrical cap nut portion formed with a screw thread to be screwed into the fastening bolt is provided with a connection conductor integrally formed of the same material, and includes the outside of the bottom portion of the cap nut portion of the connection conductor. The outer surface portion is surrounded by molding by an insulating holding member, and the insulating holding member is formed with a fixing portion for the attached portion, and the bottomed cylindrical cap nut portion constitutes the connection conductor The predetermined part of the filament is formed by drawing by a press .

According to the present invention, the conductor having a predetermined length provided with the connecting portion and the outer surface portion including the outside of the bottom portion connected to the opening formed in the connecting portion and formed by drawing by the press are formed by the insulating holding member. By providing a connecting conductor that is integrally formed of the same material with a bottomed cylindrical cap nut part that is surrounded by molding , the structure is simplified, facilitating downsizing and manufacturing, and improving insulation performance. The effect that it can also be obtained is acquired.

Claims (7)

  A conductor having a predetermined length provided with a connecting portion to another conductor fixed by a fastening bolt, and a screw connected to an opening formed in the connecting portion and screwed to the fastening bolt on an inner peripheral portion A conductor connection device comprising a connection conductor integrally formed of the same material with a bottomed cylindrical cap nut portion formed with a mountain.   2. The conductor connection according to claim 1, wherein a size of the connection portion is formed larger than a maximum outer dimension of the cap nut portion, and the connection portion also has a function of a flange with respect to the cap nut portion. apparatus.   The outer surface of the cap nut portion of the connection conductor is surrounded by an insulating holding member, and a fixing portion for the attached portion is formed on the insulating holding member. Conductor connection device.   The conductor connection device according to claim 3, wherein a plurality of the connection conductors are arranged in parallel and spaced apart from each other, and the outer surfaces of the plurality of cap nut portions are surrounded by the common insulating holding member.   5. The conductor connection device according to claim 3, wherein the insulating holding member is formed by insert molding or outsert molding using a mold.   5. The conductor connection device according to claim 3, wherein the insulating holding member is formed separately from the connection conductor, and is attached to the cap nut portion by uniting. .   The conductor connection device according to any one of claims 3 to 6, wherein an insulating coating is provided on a surface of the electric path portion excluding the connection portion and the cap nut portion of the conductor.

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