JP6232201B2 - Conductor connection device - Google Patents

Description

  Embodiments described herein relate generally to a conductor connection device that connects main circuit conductors used in a switchgear and the like.

  2. Description of the Related Art Conventionally, some power receiving and distribution devices such as switch gears use a main circuit conductor having a predetermined energization capacity and are connected to a connecting portion using a contact (see, for example, Patent Document 1). Also, there are some that are bolted and fixed with a predetermined stress using bolts and nuts (see, for example, Patent Document 2).

  In such a connection part, in order to suppress contact resistance, the contact area is increased or the number of bolts is increased, and the outer shape tends to increase in size. For this reason, in the connection part, what can suppress contact resistance and can reduce an external shape, without increasing the number of volt | bolts etc. was desired. If the contact resistance increases, the temperature increases and it becomes difficult to continue the operation.

JP-A-2-285909 JP 2003-309923 A

  The problem to be solved by the present invention is to provide a conductor connecting device capable of suppressing the contact resistance and reducing the size of the connecting portion that fastens and fixes the main circuit conductors with bolts and nuts. .

In order to solve the above-described problem, the conductor connection device according to the embodiment includes a first main circuit conductor provided with a first through hole, and a second through hole connected to the first main circuit conductor. A second main circuit conductor; a bolt that penetrates the first through hole and the second through hole; a nut that is screwed to the bolt; and a shaft portion of the bolt; A cylindrical contact that can extend and contract in an axial direction and a radial direction passing through one through hole and the second through hole, and the first main circuit conductor and the second main circuit conductor, When the bolt is tightened and fixed with the nut, the outer periphery of the cylindrical contact is in contact with the inner surface of the first through hole and the second through hole .

Sectional drawing which shows the structure of the conductor connection apparatus which concerns on Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a partial cross section of a configuration of a cylindrical contact according to a first embodiment of the present invention. Sectional drawing which shows the application example of the conductor connection apparatus which concerns on Example 1 of this invention. Sectional drawing which shows the structure of the conductor connection apparatus which concerns on Example 2 of this invention. Sectional drawing which shows the structure of the conductor connection apparatus which concerns on Example 3 of this invention.

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

  First, a conductor connection device according to a first embodiment of the present invention will be described with reference to FIGS. 1 is a cross-sectional view illustrating a configuration of a conductor connection device according to a first embodiment of the present invention. FIG. 2 is a perspective view illustrating a partial cross-section of a configuration of a cylindrical contact according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view illustrating an application example of the conductor connection device according to the first embodiment of the present invention.

  As shown in FIG. 1, a plate-like first main circuit conductor 1 made of a copper material is provided with a first through hole 2 and is made of a copper material connected to the first main circuit conductor 1. The second main circuit conductor 3 is provided with a second through hole 4. A bolt 5 made of a steel material passes through the first through hole 2 and the second through hole 4 and is fastened and fixed by a nut 6. The bolt 5 includes a head portion 5a and a shaft portion 5b. Around the shaft portion 5b, there is provided a cylindrical bellows-like expandable and contractable cylindrical contact 7 made of a metal material having elasticity and high conductivity such as zirconium copper and phosphor bronze. A flat seat 8 made of steel is provided on the head 5a side, and a flat seat 9 and a spring seat 10 made of steel are provided on the nut 6 side.

  The cylindrical contact 7 will be described with reference to FIG. Ring-shaped presser plates 11 and 12 made of a copper material are fixed to both ends of the opening by brazing, and come into contact with the flat seats 8 and 9. On the outer periphery, a plurality of slits 13 are provided in parallel with the axial direction, and each part can be bent freely in the radial direction. When not compressed, the axial length is longer than the sum of the plate thicknesses of the first main circuit conductor 1 and the second main circuit conductor 3, and the outer diameter is the first and second through holes. It is smaller than the inner diameters of 2 and 4.

  As a result, the first and second main circuit conductors 1 and 3 are overlapped while the first and second through holes 2 and 4 are aligned, the bolt 5 provided with the cylindrical contactor 7 is penetrated, and the nut 6 is When screwed and fastened, the cylindrical contact 7 is contracted in the axial direction by the presser plates 11 and 12, and each part is expanded in the radial direction. The expanded part contacts the inner surfaces of the first and second through holes 2 and 4. That is, the first and second main circuit conductors 1 and 3 are contacted by the cylindrical contactor 7 on the inner surfaces of the first and second through holes 2 and 4 as well as the contact surfaces that are in plane contact with each other. For this reason, a contact area increases and contact resistance can be suppressed.

  The outer diameter and length of the cylindrical contactor 7 are appropriately determined based on the thickness and number of the first and second main circuit conductors 1 and 3 and the inner diameters of the first and second through holes 2 and 4. You can choose. Further, if one end of the cylindrical contactor 7 is attached to the head portion 5a side of the shaft portion 5b, workability can be improved.

  Such a cylindrical contact 7 works effectively when the center axes of the first and second through holes 2 and 4 are deviated as shown in FIG. When the outer surface of the shaft portion 5b and the inner surfaces of the first and second through-holes 2 and 4 are wide, the first and second through-holes 2 and 4 are bent slightly. Will come into contact. For this reason, the central axes of the first and second through holes 2 and 4 may be slightly shifted, the degree of freedom of arrangement of the main circuit conductors 1 and 3 can be increased, and the assembling property of the power receiving and distributing device is improved. Can be made. In addition, if a plurality of slits 13 having different lengths are provided in the axial direction and the circumferential direction at random, and the bending in the axial direction and the circumferential direction is made random, the contact property can be further improved. .

  According to the conductor connection device of the first embodiment, the bolt 5 is passed through the first and second through holes 2 and 4 via the cylindrical contact 7, and the first and second main circuit conductors with the nut 6. Since 1 and 3 are fastened and fixed, the inner surfaces of the first and second through holes 2 and 4 can be brought into contact with the contact surfaces of the first and second main circuit conductors 1 and 3, and the contact resistance Can be suppressed. In addition, the connection portion can be reduced in size.

  Next, a conductor connecting device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a cross-sectional view illustrating the configuration of the conductor connection device according to the second embodiment of the present invention. The difference between Example 2 and Example 1 is that the conductivity of the surface of the shaft portion of the bolt is increased. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, a copper layer 14 is provided on the surface of the shaft portion 5 b of the bolt 5 by spraying a copper material. A material having higher conductivity than steel such as aluminum may be sprayed. These are referred to as conductive layers having higher conductivity than steel materials. In addition, since the thread part of the volt | bolt 5 is the same as that of Example 1, mechanical strength is the same.

  According to the conductor connection device of the second embodiment, in addition to the effects of the first embodiment, the inner surface of the cylindrical contact 7 is in contact with the conductive layer having a higher conductivity than the steel material, so that the contact resistance is further suppressed. Can do.

  Next, a conductor connecting device according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 5 is a cross-sectional view showing the configuration of the conductor connection device according to the third embodiment of the present invention. The third embodiment differs from the first embodiment in that a copper pipe is provided on the outer periphery of the bolt shaft. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, a copper pipe 15 is provided on the outer periphery of the shaft portion 5 b of the bolt 5. A cylindrical contact 7 is disposed on the outer periphery of the copper pipe 15. An aluminum pipe having a higher conductivity than the bolt 5 may be used. These are called pipes having higher conductivity than steel.

  According to the conductor connection device of the third embodiment, in addition to the effects of the first embodiment, the inner surface of the cylindrical contact 7 is in contact with a pipe having a higher conductivity than the steel material, so that the contact resistance can be further suppressed. it can.

  According to the embodiment as described above, since the elastic cylindrical contact is provided on the outer periphery of the bolt and the main circuit conductor is fastened and fixed, the contact area can be increased and the contact resistance is greatly increased. Can be suppressed.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 1st main circuit conductor 2 1st through-hole 3 2nd main circuit conductor 4 2nd through-hole 5 Bolt 6 Nut 7 Cylindrical contactor 14 Copper layer 15 Copper pipe

Claims (2)

A first main circuit conductor provided with a first through hole;
A second main circuit conductor provided with a second through hole connected to the first main circuit conductor;
A bolt that penetrates the first through hole and the second through hole;
A nut screwed onto the bolt;
A cylindrical contact that is provided at a shaft portion of the bolt and that can extend and contract in an axial direction and a radial direction through the first through hole and the second through hole ;
When the first main circuit conductor and the second main circuit conductor are fastened and fixed by the bolt and the nut, the outer periphery of the cylindrical contact is connected to the inner surface of the first through hole and the second A conductor connecting device, wherein the conductor connecting device contacts an inner surface of the through hole . Conductor connecting device according to claim 1, characterized in that the material of the bolt provided with a highly conductive layer having conductivity than the steel in the shaft portion and the steel.

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