JP2008204634A - Contactor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a contactor device capable of retaining stable and low electric resistance without large sizing the contactor device. <P>SOLUTION: A spring contactor 3 is fitted into a groove 2a installed at a fitting face of a conductor 2 along the circumferential direction, and in the case a side face of a short axial direction of the spring contactor 3 is made opposed to the bottom face of the groove 2a and fitted into the groove 2a, the groove 2a is formed in a shape that the side face of the groove 2a and the spring contactor 3 contact at two points, and an elastic body 4 to contact the side face of the spring contactor 3 is equipped at the bottom face of the groove 2a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a contact device used for a current-carrying part of an electric device.

In electrical equipment, the conductor is often divided into a plurality of parts to facilitate assembly of the equipment. Therefore, a contact device for connecting conductors is required when assembling an electric device. The contact device is required to stably maintain a low electric resistance. In addition, depending on the equipment used, it is necessary to absorb the equipment size tolerance during assembly and the relative displacement due to the thermal expansion and contraction of the conductor under use.
For example, as a conventional contact device in a gas-insulated switchgear, a pair of coaxially arranged conductors are moved in the axial direction and fitted at the ends, and the pair of conductors are electrically contacted with each other at the fitting surface. There has been a configuration in which current is supplied through a child (see, for example, Patent Document 1).
The contactor device of Patent Document 1 has at least two types of gaps on the fitting surfaces of a pair of conductors, and these gaps are formed by protrusions on the periphery of a cylindrical conductor. In addition, the contact disposed on the mating surface of the pair of conductors is formed of a coil spring-shaped spring contact, and contacts with the pair of conductors while maintaining a predetermined contact force, thereby obtaining a low contact resistance. It is done. With such a structure, a contact pressure stable against changes in the insertion angle of the conductor can be obtained at the connection portion of the pair of conductors.

The spring contactor is formed in a single band shape by winding a wire made of a conductive spring material in a spiral manner by inclining at an angle of 90 degrees or less with respect to its winding axis. Both ends are joined to form an annular spring contact, which is fitted into a groove provided along the circumferential direction on one fitting surface of the pair of conductors. A plurality of the grooves are provided in the axial direction, and a plurality of the annular spring contacts are arranged in the axial direction.
Since the spring contactor is wound spirally at an angle of 90 degrees or less with respect to the winding axis, the cross section perpendicular to the winding axis is elliptical, and the spring contacts in the short axis direction. Has the property of having elasticity. For this reason, the spring contactor having an elliptical cross section is fitted in the groove with the side surface in the short axis direction facing the bottom surface of the groove, and is arranged in the gap between the pair of conductors. The repulsive force acts between the spring contact and each conductor, and good electrical contact can be obtained.

JP 2005-176536 A

  Since the conventional contact device is configured as described above, when a contact device for a large current is required, in order to reduce contact resistance and suppress heat generation, a spring contact and a conductor In order to do so, it is necessary to increase the diameter of the conductor or increase the length of the conductor in the axial direction to increase the number of annular spring contacts and arrange them in parallel. is there. As a result, the size of the contact device increases, and there is a problem in that the electrical equipment using the contact device inevitably increases in size due to the current paths of different phases or the insulation distance between the housings.

  The present invention has been made to solve such a problem. The contact resistance of the contact portion between the conductor and the contact is reduced and the electrical resistance is stably maintained without increasing the size of the contact device. It is aimed to obtain a contact device that can be used.

  A contactor device according to the present invention is the contactor device in which a pair of conductors arranged on the same axis are moved and fitted in the axial direction, and the pair of conductors are energized through conductive contacts. The contact is a spring contact having an elliptical cross section in which a strand is wound in a spiral manner with respect to the winding axis, and either one of the pair of conductors has the fitting surface of the pair of conductors. And a groove that fits the spring contact, and the groove has a side surface in the minor axis direction of the spring contact having an elliptical cross section. Is formed so that the side surface of the groove and the spring contactor are in contact with each other at two locations, and the bottom surface of the groove is in contact with the side surface of the spring contactor. It has a body.

  According to this invention, it is possible to reduce the contact resistance of the contact portion between the conductor and the spring contactor without increasing the size of the contactor device, and to obtain a contactor device that can stably maintain a low electrical resistance. it can.

Embodiment 1 FIG.
FIG. 1 is a sectional configuration diagram showing a contact device according to Embodiment 1 of the present invention, and FIG. 2 is an enlarged view showing an enlarged contact portion of the contact device according to Embodiment 1 of the present invention. FIG. 3 is a sectional configuration view taken along line AA in FIG.
In the figure, the first conductor 1 and the second conductor 2 are paired to form an energization path. Both the first conductor 1 and the second conductor 2 have a cylindrical shape, and are arranged on the same axis (B) in order to form an energization path. The first conductor 1 has a cylindrical hollow structure at the end, the second conductor 2 has a small diameter structure at the end, and the small diameter part of the second conductor 2 fits into the hollow part of the first conductor 1. It has a structure that can be combined. The inner diameter of the hollow portion of the first conductor 1 is set larger than the outer diameter of the small diameter portion of the second conductor 2.

  In addition, the outer peripheral surface of the small-diameter portion of the second conductor 2 (the fitting surface that fits the first conductor 1) is a portion that intersects the surface that intersects the axis (B) direction of the conductors 1 and 2. A groove 2a is provided along the circumferential direction (here, along the circumferential direction), and the spring contact 3 is fitted in the groove 2a. An elastic body 4 is provided on the bottom surface of the groove 2a and supports the spring contact 3.

FIG. 4 is a side view showing a part of the spring contact. The spring contact is made by inclining an element wire made of a conductive spring material at an angle (α) within 90 degrees with respect to its winding axis S. It is spirally wound and formed into an integral band. In the present embodiment, both ends of such a spring contact are joined to form an annular spring contact 3, which is disposed over the entire circumference of the groove 2a of the conductor 2. At this time, the spring contact 3 may be wound as it is without welding, although there is no fear of dropping at the time of assembly by joining the end portions by welding so as to form an annular shape. A plurality of grooves 2a are provided in the axis (B) direction, and a plurality of annular spring contacts 3 are disposed in the axis (B) direction.
Further, since the spring contact 3 is spirally wound at an angle of 90 degrees or less with respect to the winding axis, the cross section perpendicular to the winding axis is elliptical, and the minor axis direction Has the property of having spring elasticity. For this reason, the side surface in the short axis direction of the spring contactor 3 having an elliptical cross section is fitted into the groove 2a so as to face the bottom surface of the groove 2a, and is arranged in the gap between the pair of conductors 1 and 2. The elastic repulsion force of the spring contact 3 acts between the spring contact 3 and each of the conductors 1 and 2, and good electrical contact can be obtained.

Further, as shown in FIG. 2, the cross-sectional shape of the groove 2a is a trapezoidal shape expanding outward, and the side surface in the short axis direction of the spring contact 3 having an elliptical cross section is defined as the bottom surface of the groove 2a. When it is fitted in the groove 2a so as to face each other, there is an angle θ ₀ (0 ° <θ ₀ <90 °) such that the side surface of the groove 2a and the spring contact 3 come into contact at two points.
By setting it as such a structure, the electricity supply path | route in the spring contactor 3 becomes short, and the electrical resistance between a pair of conductors 1 and 2 can be made small.
Furthermore, since two contact portions between the spring contact 3 and the conductor 2 provided with the groove 2a can be ensured reliably, the contact electrical resistance between the spring contact 3 and the conductor 2 can be achieved at one location. Compared to the case of contact, it can be made smaller.

As described above, in the present embodiment, when the spring contactor 3 is fitted into the groove 2a, the side surface in the short axis direction of the spring contactor 3 is opposed to the bottom surface of the groove 2a, and the side surface of the groove 2a and the spring The contact is made to contact at two points. However, since the cross section of the spring contact 3 is elliptical, the contact position on the side surface of the groove 2a is difficult to be determined, and the state in which the side surface in the short axis direction of the spring contact 3 faces the bottom surface of the groove 2a is not necessarily maintained. Not necessarily.
FIG. 5A shows a steady state before the spring contact 3 is tilted, and FIG. 5B shows a state where the spring contact 3 is tilted. For example, when the pair of conductors 1 and 2 are subjected to relative displacement, as shown in FIG. 5B, the spring contact itself tilts in the groove 2a due to sliding resistance, and the contact pressure increases or the spring contact occurs. It has been found that it is difficult to stably maintain a low contact resistance when problems such as plastic deformation of the child 3 itself occur.

In the present embodiment, in order to solve such a problem, an elastic body 4 is further provided on the bottom surface of the groove 2a, the spring contact 3 is supported by the elastic body 4, and the short axis of the spring contact 3 is provided. The side surface in the direction is stably opposed to the bottom surface of the groove 2a.
Specifically, as shown in FIG. 2, an elastic body 4 having a V-shaped concave curved surface in a cross section perpendicular to the extending direction of the groove 2a is provided on the bottom surface of the groove 2a. The spring contact 3 is supported by a concave curved surface.
The V-shaped angle θ1 is set to (180 ° −θ) <θ1 <180 ° so that the elastic body 4 can contact the spring contact 3 and stably support the spring contact 3. Here, θ is an angle formed by two contact portions where the spring contact 3 contacts the side surface of the groove 2a with respect to the elliptical center of the spring contact 3 having an elliptical cross section. The cross-sectional shape of the groove 2a is a groove shape expanded at a predetermined angle so that the side wall of the groove 2a to be contacted at two locations, and θ is set to be an arbitrary angle less than 180 degrees. .

Note that it is preferable that the elastic body 4 be arranged in a ring shape connected to the bottom surface of the groove 2a because there is no risk of falling off during assembly. However, one piece of the elastic body 4 is not connected to the ring shape but is connected to the bottom surface of the groove 2a. Or may be divided into a plurality of portions and arranged on the bottom surface of the groove 2a on the circumference.
In addition, the elastic body 4 is made of a polymer resin material, rubber, elastomer, foam, or the like, which has a sufficiently low elastic modulus as compared with metal materials such as copper, aluminum and iron used for the spring contact 3 and the conductors 1 and 2. A member or the like may be used.
The material of the conductor 2 on the side where the spring contact 3 is disposed is preferably a material having a lower hardness than the material of the spring contact 3. For example, when the spring contact 3 is made of a copper-based material, the conductor 2 is preferably made of an aluminum-based material.

Further, as described above, when the material of the conductor 2 on the side where the spring contact 3 is arranged cannot be made of a material having a lower hardness than the material of the spring contact 3, the groove 2a with which the spring contact 3 comes into contact is formed. It is desirable to coat the side portion with a material having a lower hardness than the material of the spring contact 3. For example, when the spring contact 3 is a copper-based material, it is desirable to form a film such as silver plating or tin plating in the groove 2a.
In this case, the spring contact 3 may be coated with a coating having a lower hardness than the spring contact 3.

Next, the operation will be described.
Since the spring contact 3 has such a characteristic that the spring constant becomes the smallest in the short axis direction, the spring contact 3 is sandwiched between the first conductor 1 and the second conductor 2 and bent in the short axis direction of the spring contact 3. 2 occurs, the contact load indicated by arrows F1 and F2 in FIG. 2 acts due to the repulsive force. At this time, since the force that the spring contact 3 acts on the second conductor 2 is in the direction indicated by the arrow F in the figure, the angle θ is applied to the side surface of the groove 2a of the second conductor 2. The force is divided, and the forces F1 and F2 act as component forces on both sides.
Similarly, a reverse force of the same magnitude as F acts on the first conductor 1 from the spring contact 3. At this time, it is easily estimated from the parallelogram law that the magnitudes of the component forces F1 and F2 increase as the angle θ increases within a range of less than 180 degrees.

  As described above, the spring contactor 3 is in contact with the first conductor 1 at one location with the force of F, and is contacted with the second conductor 2 at two locations with the forces of F1 and F2, respectively. Thus, the first conductor 1 and the second conductor 2 are established as a contact device that forms an energization path via the spring contact 3.

Here, in order to obtain a stable contact load insensitive to the dimensional accuracy of the distance between the first conductor 1 and the second conductor 2 facing each other, between the first conductor 1 and the second conductor 2. It is necessary to maintain the position of the spring contactor 3 installed in the short axis direction of the cross section, that is, the direction in which the spring constant is minimized.
In this embodiment, since the elastic body 4 having a V-shaped cross section is inserted in the bottom surface of the groove 2a, the position of the spring contact 3 is stably held by being supported by the elastic body 4 at two places. Is done. Further, even when an axial frictional force is applied when the first conductor 1 and the second conductor 2 are attached / detached, the spring contact 3 is restricted to a stable position so that the short axis direction becomes the bottom surface. Therefore, the spring elasticity is not lost, and a low electric resistance can be stably obtained.
In addition, since the elastic body 4 holding the spring contact 3 has a lower elastic modulus than the spring contact 3 and the conductors 1 and 2, the repulsive force is almost not affected by the repulsive force obtained from the spring contact 3. It acts on the side surface of the second groove 2a. Therefore, the contact load (F1 + F2) between the spring contact 3 and the side surface of the groove 2a of the conductor 2 is amplified to be greater than the repulsive force F of the spring contact 3, thereby increasing the contact area and increasing the electric resistance. Can be reduced.

Further, by making the material of the conductor 2 lower in hardness than the material of the spring contact 3, the contact area between the conductor 2 and the spring contact 3 is plastically deformed, thereby increasing the contact area and reducing the electrical resistance. There is.
The same effect can also be obtained by coating the contact portion of the groove 2a of the conductor 2 with the spring contact 3 or by coating the spring contact 3 with a material having a hardness lower than that of the spring contact 3.

As described above, the contact device according to the present embodiment has a spring contact with the side surface of the groove when the short-axis side surface of the spring contact member having an elliptical cross section is opposed to the bottom surface of the groove. Since the groove is in contact with the child at two locations, the energization path in the spring contact is shortened, and the electrical resistance between the pair of conductors can be reduced. In addition, since two contact portions between the spring contact and the conductor provided with the groove can be surely secured, the contact electrical resistance between the spring contact and the conductor is compared with a case where contact is made at one place. Can be reduced.
In addition, an elastic body that contacts the side surface of the spring contactor is provided on the bottom surface of the groove, and the side surface in the short axis direction of the spring contactor having an elliptical cross section is opposed to the bottom surface of the groove. Low electrical resistance can be maintained.
As a result, the contact device of the present embodiment can drastically reduce the electrical resistance between the first conductor and the second conductor without increasing the length and number of spring contacts. There is an effect that a large current can flow without increasing the size of the contact device.

Embodiment 2. FIG.
FIG. 6 is an enlarged view showing a contact portion of the contact device according to Embodiment 2 of the present invention.
In the contact device shown in the first embodiment, the elastic body 4 has a concave curved surface facing the spring contact 3 and a V-shaped cross section. In the contact device shown in the second embodiment, as shown in FIG. 6, the elastic body 4 has a concave curved surface on the surface facing the spring contact 3, and is orthogonal to the extending direction of the groove 2a. The difference from the first embodiment is that the cross-sectional shape is an arc. Other configurations and functions are the same as those of the contact device shown in the first embodiment.
In the present embodiment, the radius of curvature R1 of the elastic body 4 on the surface where the elastic body 4 and the spring contact 3 come into contact (the side surface in the short axis direction of the spring contact 3 in FIG. 6) is the spring contact 3 It is preferable that the radius of curvature is greater than or equal to (the radius of curvature Rs in the minor axis direction in FIG. 6).
Thereby, since there exists an effect which the spring contactor 3 is controlled by the stable position, stable electrical resistance is obtained.

  In addition, the cross-sectional shape of the elastic body 4 is not an arc shape, the contact surface of the elastic body 4 that contacts the spring contact 3 is a curved surface, and the curvature radius of the curved surface (contact surface) is the elastic body 4 and the spring contact 3. If the radius of curvature is greater than or equal to the radius of curvature of the spring contact 3 at the contact portion, the spring contact 3 is similarly regulated to a stable position, so that stable electrical resistance can be obtained.

Embodiment 3 FIG.
FIG. 7 is an enlarged view showing a contact portion of the contact device according to Embodiment 3 of the present invention.
In the contact device shown in the first embodiment, the elastic body 4 has a concave curved surface facing the spring contact 3 and a V-shaped cross section. In the contact device shown in the third embodiment, as shown in FIG. 7, the elastic body 4 has a trapezoidal cross section perpendicular to the extending direction of the groove 2a, and the portion facing the spring contact 3 is flat. This is different from the first embodiment. Other configurations and functions are the same as those of the contact device shown in the first embodiment.
In this case, since the elastic body 4 is slightly deformed, it can bite into the side surface of the spring contact 3 and can support the spring contact 3, so that a stable electrical resistance can be obtained.

Embodiment 4 FIG.
FIG. 8 is an enlarged view showing a contact portion of the contact device according to Embodiment 4 of the present invention.
In the contact device shown in the first embodiment, the groove 2a of the second conductor 2 has a trapezoidal shape with a cross section orthogonal to the extending direction of the groove 2a expanding outward. In the contact device shown in the fourth embodiment, as shown in FIG. 8, the groove 2a is a curved surface having a concave cross section perpendicular to the extending direction of the groove 2a, and is provided on the bottom surface of the groove 2a. 4 differs from the first embodiment in that the surface facing the spring contact 3 is a surface along the side surface of the spring contact 3. Other configurations and functions are the same as those of the contact device shown in the first embodiment.
In addition, when the side surface in the short axis direction of the spring contactor 3 having an elliptical cross section is fitted to the groove 2a so as to face the bottom surface of the groove 2a, the side surface of the groove 2a and the spring contactor 3 are in contact at two places. To this end, as shown in FIG. 8, the radius of curvature R2 of the groove 2a at the contact portion between the spring contact 3 and the groove 2a is larger than the radius of curvature R of the spring contactor 3 at the contact portion and has a cross section. Needs to be smaller than the radius of curvature Rs of the elliptical spring contact 3 in the minor axis direction.

  In FIG. 8, the elastic body 4 provided on the bottom surface of the groove 2 a is configured such that the surface facing the spring contact 3 is a surface along the side surface of the spring contact 3. As shown in the first to third embodiments, the opposing surface of the body 4 may be a V-shaped concave surface, an arc-shaped concave surface, or a flat surface.

  As a result, the same effects as in the first to third embodiments can be obtained, and at the contact surface between the spring contact 3 and the groove 2a of the conductor 2, the relative radius of curvature between the spring contact 3 and the side surface of the groove 2a is obtained. Therefore, even when the same contact load is applied between the spring contact 3 and the conductor 2, the contact area increases, so that the electrical resistance can be reduced.

Embodiment 5. FIG.
FIG. 9 is an enlarged view showing a contact portion of a contact device according to Embodiment 5 of the present invention.
In the contact device shown in the first to fourth embodiments, the groove 2a is provided in the small diameter portion of the second conductor 2, and the spring contact 3 is fitted in the groove 2a. In the contact device shown in the fifth embodiment, as shown in FIG. 9, the groove 1a is formed on the inner peripheral surface of the hollow portion of the first conductor 1, and the spring contact 3 is arranged in the groove 1a. The second conductor 2 is different from the first to fourth embodiments in that the small-diameter portion of the second conductor 2 is a solid rod. Other configurations and functions are the same as those of the contact device shown in the first to fourth embodiments.
Thereby, the effect similar to Embodiment 1-4 is acquired.

Embodiment 6 FIG.
FIG. 10 is an enlarged view showing a contact portion of a contact device according to Embodiment 6 of the present invention.
In the contact device shown in the first to fifth embodiments, both the first conductor 1 and the second conductor 2 are cylindrical. In the contact device shown in the sixth embodiment, as shown in FIG. 10, the first conductor 1 is a flat plate having a U-shaped cross section at the end, and the second conductor 2 is the second conductor 1. It is constituted by a flat plate inserted between the U-shaped gaps, and the spring contact 3 is configured to be fitted into a groove provided on one of the fitting surfaces of the pair of conductors 1 and 2. This is different from the first to fifth embodiments. The groove provided in one of the fitting surfaces of the pair of conductors is provided along a portion intersecting with the surface intersecting the axial direction of the pair of conductors. The upper and lower surfaces of the tip are provided along the direction orthogonal to the insertion direction of the conductor 2. Other configurations and functions are the same as those of the contact device shown in the first to fifth embodiments.
Thereby, the same effect as Embodiments 1 to 5 can be obtained not only for the cylindrical conductor but also for the flat conductor.

It is a cross-sectional block diagram which shows the contactor apparatus by Embodiment 1 of this invention. It is an enlarged view which shows the contact part of the contactor apparatus by Embodiment 1 of this invention. It is a cross-sectional block diagram in the AA of FIG. It is a side view which shows a part of spring contactor concerning Embodiment 1 of this invention. It is a figure explaining the behavior of the spring contactor concerning Embodiment 1 of this invention. It is an enlarged view which shows the contact part of the contactor apparatus by Embodiment 2 of this invention. It is an enlarged view which shows the contact part of the contactor apparatus by Embodiment 3 of this invention. It is an enlarged view which shows the contact part of the contactor apparatus by Embodiment 4 of this invention. It is a cross-sectional block diagram which shows the contactor apparatus by Embodiment 5 of this invention. It is a perspective view which shows the contactor apparatus by Embodiment 6 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st conductor, 2 2nd conductor, 3 Spring contact, 4 Elastic body, 1a, 2a Groove.

Claims (6)

In a contact device that moves and fits a pair of conductors arranged on the same axis in the axial direction and energizes the pair of conductors through a conductive contact,
The contact is a spring contact having an elliptical cross section, in which the strand is wound spirally with respect to the winding axis,
One fitting surface of the pair of conductors is provided along a portion intersecting a surface intersecting the axial direction of the pair of conductors, and has a groove for fitting the spring contact,
The groove has a shape in which the side surface of the groove and the spring contactor come into contact with each other at two locations when the side surface in the short axis direction of the spring contactor having an elliptical cross section is fitted to the bottom surface of the groove. A contactor device comprising an elastic body in contact with a side surface of the spring contactor on a bottom surface of the groove. 2. The contact device according to claim 1, wherein the surface of the elastic body facing the spring contact is a concave curved surface having a V-shaped cross section perpendicular to the extending direction of the groove. The surface of the elastic body that contacts the spring contact is a curved surface having a concave cross section perpendicular to the extending direction of the groove, and the radius of curvature of the curved surface is determined by the spring at the contact portion between the elastic body and the spring contact. The contactor device according to claim 1, wherein the contactor device has a radius of curvature greater than or equal to the contactor radius. The groove provided on one fitting surface of the pair of conductors is a curved surface having a concave cross section perpendicular to the extending direction of the groove, and the curvature of the groove at the contact portion between the spring contact and the groove. 2. The contact device according to claim 1, wherein the radius is larger than the radius of curvature of the spring contact at the contact portion and smaller than the radius of curvature of the spring contact having an elliptical cross section in the short axis direction. The contactor device according to any one of claims 1 to 4, wherein a material having a lower hardness than a material of the spring contactor is used as a conductor material provided with a groove for fitting the spring contactor. The contactor device according to any one of claims 1 to 4, wherein a side surface of the groove that contacts the spring contactor is coated with a material having a hardness lower than that of the spring contactor.

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