JP2013192427A - Slip ring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a slip ring device the cooling efficiency of which can be enhanced when compared with prior art.SOLUTION: A slip ring device 10A comprises: a slip ring 11 provided on a rotating shaft 1; and a brush 12 being pressed against the surface of the slip ring 11. A plurality of slip rings 11 are provided, side by side in the axis Ax direction, on the rotating shaft 1. The plurality of slip rings 11 are arranged while spaced apart in the axis Ax direction so as not to come into contact with each other. An insulation ring 13 is provided coaxially with the rotating shaft 1 between adjoining slip rings 11. When viewed from a direction orthogonal to the axis Ax direction, the insulation ring 13 has a cross-sectional surface formed asymmetrically with respect to the axis Ax direction.

Description

  The present invention includes a conductive ring member and a conductive brush member pressed against the surface of the ring member, and one of the ring member and the brush member is provided on the rotating body and the other is provided on the fixed portion. The present invention relates to a slip ring device.

  One of the slip ring and the brush is provided on the rotating body and the other is provided on the fixed body, and the brush is pressed against the slip ring to exchange electricity such as electric power or electric signal between them. It has been known. As such a slip ring device, a device in which a slip ring and a brush are accommodated in a cover member in which a plurality of heat radiating holes are provided on a peripheral wall is known (see Patent Document 1).

JP 2011-166842 A

  In the apparatus of Patent Document 1, when the temperature in the cover member rises, the internal air and the amount of heat are discharged from the vent hole to the outside, and the external air flows from the other vent hole. Thus, in this apparatus, the flow of air is generated by utilizing the rise in temperature in the cover member, thereby cooling the apparatus. However, in this apparatus, since the air flow does not occur until the temperature in the cover member rises, the cooling efficiency is poor.

  Therefore, an object of the present invention is to provide a slip ring device capable of improving the cooling efficiency of the device as compared with the conventional one.

  The slip ring device of the present invention includes a conductive ring member and a conductive brush member pressed against the surface of the ring member, and one of the ring member and the brush member is arranged around an axis. In a slip ring device that is provided in a rotating part that is provided on a rotating part and the other member is provided in a non-rotatably fixed part, and that exchanges electricity between the ring member and the brush member, A plurality of one members are provided side by side in the axial direction, and the plurality of one members are arranged apart from each other in the axial direction so as not to contact each other, and a ring-shaped insulation is provided between the adjacent one members. A member is provided coaxially with the rotating body, and the insulating member has a non-sectional shape with respect to the axial direction when viewed from a direction orthogonal to the axial direction. Is formed in a universal (claim 1).

  In the slip ring device of the present invention, since the surrounding gas or liquid is sheared from the ring member or the insulating member when the rotating body rotates, a vortex rotating in the rotating direction of the rotating body is formed. The insulating member has an asymmetric cross-sectional shape with respect to the axial direction. Therefore, when the rotating body rotates, a pressure difference is generated between one side and the other side in the axial direction around the insulating member, thereby generating an axial flow around the insulating member. This axial flow collides with the other member to form a radially outward flow. And since the vortex disturbance mentioned above can be generated from the low rotation area by these flows, the heat transfer coefficient between the ring member and the brush member and the surrounding gas or liquid can be improved. Thereby, since the movement of the heat from a ring member and a brush member to gas or a liquid can be accelerated | stimulated, the cooling efficiency of an apparatus can be improved.

  In one form of the slip ring device of the present invention, the insulating member may have an outer diameter larger than a radial size of the one member (Claim 2). In this case, the pressure difference generated around the insulating member when the rotating body rotates can be increased. Therefore, the axial flow generated around the insulating member can be strengthened. As a result, the vortex disturbance can be increased, and the heat transfer coefficient can be further improved. Therefore, the cooling efficiency of the apparatus can be further improved.

  In one form of the slip ring device of the present invention, the rotating body is provided with three or more of the one members, and the insulating members are provided between the one members, and the insulating members are adjacent to each other. One of the two insulating members is such that one surface in the axial direction of the insulating member faces one side in the axial direction and the one surface of the other insulating member faces the other side in the axial direction. It may be provided (Claim 3). According to this aspect, it is possible to generate a flow from one side in the axial direction to the other side and a flow from the other side to the other side. Thereby, since the vortex disturbance can be further increased, the heat transfer coefficient can be further improved. Therefore, the cooling efficiency of the apparatus can be further improved.

  As described above, according to the slip ring device of the present invention, since the axial direction flow can be generated by the insulating member, the vortex generated around the rotating body from the low rotation range can be disturbed. Thereby, since the heat transfer rate between the ring member and the brush member and the surrounding gas or liquid can be improved, the cooling efficiency of the apparatus can be improved.

The figure which shows schematically the slip ring apparatus which concerns on one form of this invention. The figure which expands and shows the part enclosed with the broken line of FIG. The figure which shows the modification of an insulating ring. The figure which shows schematically the other slip ring apparatus with which this invention is applied.

  FIG. 1 schematically shows a slip ring device according to an embodiment of the present invention. The slip ring device 10A includes a plurality of (three in FIG. 1) slip rings 11 as ring members and a brush 12 as a brush member. The slip ring 11 is made of a conductive material such as metal. The slip ring 11 is formed in a ring shape. The slip ring 11 is coaxially fixed to the rotating shaft 1 as a rotating body that can rotate about the axis Ax. Therefore, the slip ring 11 corresponds to one member of the present invention. As shown in this figure, the slip rings 11 are arranged apart from each other in the axis Ax direction so as not to contact each other.

  The brush 12 is a block-shaped material containing graphite (carbon) and having conductivity. A plurality of, for example, three brushes 12 are provided for one slip ring 11. In this figure, only one is shown. The brush 12 is supported by a case (not shown) as a fixed portion so as not to rotate and to move in the radial direction. Therefore, the brush 12 corresponds to the other member of the present invention. The brush 12 is urged radially inward so as to be pressed against the slip ring 11 by a spring (not shown). Since the slip ring 11 and the brush 12 are the same as those of a known slip ring device, detailed description thereof is omitted.

  The slip ring device 10A includes an insulating ring 13 as an insulating member. The insulating ring 13 is made of an insulating material such as resin. The insulating ring 13 is formed in a ring shape. As shown in this figure, the insulating ring 13 is formed so that the outer diameter is larger than the outer diameter of the slip ring 11. The insulating rings 13 are respectively disposed between the adjacent slip rings 11. The insulating ring 13 is fixed to the rotating shaft 1 so as to rotate integrally with the rotating shaft 1.

  FIG. 2 shows an enlarged portion P1 surrounded by a broken line in FIG. As shown in this figure, one surface 13a in the direction of the axis Ax of the insulating ring 13 is formed so as to extend straight in the radial direction from the inner periphery to the outer periphery. On the other hand, the other surface 13b in the axis Ax direction of the insulating ring 13 is formed obliquely so as to approach the one surface 13a side from the inner periphery toward the outer periphery. As described above, the insulating ring 13 is formed so that the cross-sectional shape is asymmetric with respect to the axis Ax direction when viewed from the direction orthogonal to the axis Ax direction. The shape of the insulating ring 13 is set so that a sufficient insulating distance can be secured between the adjacent slip rings 11. Thereby, it is possible to prevent a short circuit from occurring between the adjacent slip rings 11. As shown in FIG. 1, the insulating rings 13 are provided so that the directions in the axis Ax direction are alternately opposite. That is, one of the adjacent insulating rings 13 is provided such that one surface 13a faces one side in the axis Ax direction (for example, the right side in FIG. 1), and the other insulating ring 13 The surface 13a is provided so as to face the other side in the axis Ax direction (for example, the left side in FIG. 1).

  In this slip ring device 10 </ b> A, when the rotating shaft 1 rotates, the surrounding air is sheared from the slip ring 11 and the insulating ring 13, so that an air vortex rotating in the rotating direction of the rotating shaft 1 is formed. Since the insulating ring 13 has an asymmetric cross-sectional shape with respect to the axis Ax direction, a pressure difference is generated between the one surface 13a and the other surface 13b when the rotary shaft 1 rotates. Therefore, an air flow F in the direction of the axis Ax is generated around the insulating ring 13 as shown in FIG. As shown in FIG. 1, the insulating rings 13 are provided so that the directions in the axis Ax direction are alternately opposite. Therefore, a right air flow Fr and a left air flow Fl in FIG. 1 are generated around the slip ring device 10A. In addition, when these air flows Fr and Fl collide with the brush 12, an air flow Fout directed radially outward is formed.

  As described above, according to the slip ring device 10A of the present invention, the air flows Fr and Fl in the direction of the axis Ax can be formed by the insulating ring 13 when the rotary shaft 1 rotates. Moreover, the air flow Fout which goes to radial direction outer side by this can be formed. In the slip ring device 10A of the present invention, since the outer diameter of the insulating ring 13 is larger than the outer diameter of the slip ring 11, the pressure difference between the one surface 13a and the other surface 13b of the insulating ring 13 is increased. Can be big. Therefore, the air flows Fr, Fl, and Fout can be strengthened. And since these air flows Fr, Fl, and Fout can generate vortex turbulence from the low rotation range, the heat transfer coefficient between the slip ring 11 and the brush 12 and the surrounding air can be improved. it can. Therefore, the heat transfer from the slip ring 11 and the brush 12 to the air can be promoted. Therefore, the cooling efficiency of the slip ring device 10A can be improved. Further, this can reduce the amount of wear of the brush 12. Further, it is possible to prevent the abrasion powder generated from the brush 12 from being accumulated in a specific place due to the air flow Fout directed radially outward. Therefore, it is possible to suppress the occurrence of a failure due to wear powder.

  In addition, the cross-sectional shape of the insulating ring 13 provided in the slip ring device 10A of the present invention is not limited to the shape described above. For example, the shape shown in FIG. 3 may be used. 3 is a view corresponding to FIG. 2. In this modification, as shown in FIG. 2, the insulating ring 13 has a vertical portion 20 extending radially outward, and extends from the tip of the vertical portion 20 in the axis Ax direction. And a horizontal portion 21. The horizontal portion 21 is provided only on one side of the vertical portion 20 in the axis Ax direction. As a result, the cross-sectional shape of the insulating ring 13 is formed asymmetrically with respect to the direction of the axis Ax. Also in this modified example, a pressure difference is generated between one side and the other side of the insulating ring 13 when the rotary shaft 1 is rotated, so that an air flow F in the axis Ax direction can be generated around the insulating ring 13. . Therefore, the vortex disturbance is generated from the low rotation region as in the above-described embodiment. Therefore, the cooling efficiency of the slip ring device 10A can be improved.

  The slip ring device to which the present invention is applied is not limited to the above-described air cooling type. For example, as shown in FIG. 4, the present invention is applied to a slip ring device 10 </ b> B in which a slip ring 11 and a brush 12 are housed in a sealed housing case 30 and a fluorine-based liquid FL is sealed in the housing case 30. May be. In this figure, parts common to those in FIG. 1 or FIG. As the fluorinated liquid FL, a solvent having a boiling point of a maximum use temperature of the slip ring 11, for example, 150 ° C. or more is used. Such a fluorinated liquid is commercially available for refrigerants, cleaning or lubrication. In the present invention, such a well-known fluorinated liquid may be used. Therefore, the detailed description regarding the fluorinated liquid is omitted. As shown in this figure, the amount of the fluorinated liquid FL to be sealed is adjusted so that the liquid level is about the axis Ax of the rotating shaft 1 when the rotating shaft 1 is stopped. Thereby, the head space 31 is provided in the housing case 30. The housing case 30 is provided with an oil seal 32 in order to prevent the fluorinated liquid FL from leaking from the gap between the case 30 and the rotary shaft 1.

  In the slip ring device 10B as well, the flows Fr and Fl of the air and the fluorinated liquid FL can be formed when the rotating shaft 1 rotates as in the above-described embodiment. Further, it is possible to form a flow Fout of the air or the fluorinated liquid FL toward the radially outer side. Therefore, the heat transfer coefficient between the slip ring 11 and the brush 12 and the surrounding air or the fluorinated liquid FL can be improved. Therefore, the cooling efficiency of the slip ring device 10B can be improved. Further, this can reduce the amount of wear of the brush 12. Note that the amount of the fluorinated liquid FL sealed in the slip ring device 10B is not limited to the amount shown in FIG. For example, the fluorinated liquid FL may be enclosed in the housing case 30 so that the entire slip ring 11 and the brush 12 are immersed in the fluorinated liquid FL.

  This invention is not limited to each form mentioned above, It can implement with a various form. For example, the slip ring apparatus to which the present invention is applied is not limited to an apparatus in which a slip ring is provided on a rotating body and a brush is provided on a fixed side. The present invention may be applied to a slip ring device in which a brush is provided on a rotating body and a slip ring is provided on a fixed side.

  The slip ring device to which the present invention is applied is not limited to one having three slip rings. The present invention can be applied to a slip ring device provided with two or more slip rings. Further, the number of brushes in the slip ring device of the present invention is not limited to three for one slip ring. The number of brushes provided for one slip ring may be one or two. Moreover, you may provide four or more brushes with respect to one slip ring.

1 Rotating shaft (Rotating body)
10A, 10B Slip ring device 11 Slip ring (ring member, one member)
12 Brush (Brush member, other member)
13 Insulation ring (insulation member)
13a One side Ax axis

Claims (3)

A conductive ring member and a conductive brush member pressed against the surface of the ring member, and one of the ring member and the brush member is provided on a rotating body that rotates about an axis. In the slip ring device which is provided in a fixed portion where the other member is fixed so as not to rotate, and exchanges electricity between the ring member and the brush member,
The rotating member is provided with a plurality of the one member arranged in the axial direction, and the plurality of one members are arranged apart in the axial direction so as not to contact each other,
Between the one adjacent members, a ring-shaped insulating member is provided coaxially with the rotating body,
The insulating ring is a slip ring device in which a cross-sectional shape is formed asymmetrically with respect to the axial direction when viewed from a direction orthogonal to the axial direction.   The slip ring device according to claim 1, wherein the insulating member has an outer diameter larger than a radial size of the one member. The rotating body is provided with three or more of the one member and the insulating member between the one member,
In each insulating member, one of the two insulating members adjacent to each other in the axial direction faces one side in the axial direction, and the other insulating member faces in the axial direction. The slip ring device according to claim 1 or 2, wherein the slip ring device is provided so as to face the other side.

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