JP5502687B2 - Slip ring device - Google Patents

Description

  One embodiment relates to a slip ring device.

  For example, an antenna directing device such as a radar device has a vertical slip ring device having a rotation axis extending in the vertical direction. In this type of slip ring device, an electrode ring is provided on the rotating side, a brush is provided on the fixed side, and the brush can slide on the ring outer peripheral surface of the electrode ring. When the rotation-side electrode ring is driven to rotate, the fixed-side brush comes into sliding contact with the outer peripheral surface of the ring, and electrical coupling is performed between the rotation-side and the fixed-side. By incorporating graphite into the brush material, the orientation of the brush is increased, and friction associated with the sliding contact of the brush is reduced.

JP 2003-324905 A Japanese Patent No. 2,848,838 JP 07-23546 A

  By the way, since the slip ring which is an electrode ring is arrange | positioned in multiple numbers by the up-down direction, a brush and the outer peripheral surface of a slip ring will slidably contact, and an abrasion powder will arise. The wear powder accumulates on the upper surface of the slip ring below the brush sliding contact portion. When the slip ring rotates, the abrasion powder scatters around the slip ring by the rotational drive. The abrasion powder adheres to the surface of the frame that supports the brush and the inner wall of the cover that covers the slip ring. In electrical coupling, it is difficult to adjust the power with high accuracy, resulting in problems such as electrical noise and poor insulation.

  For this reason, the present inventor has already been supported so as to be freely rotatable, and the second rotation in which the slip ring is formed on the outer peripheral wall and the first rotation portion in which the slip ring is formed on the inner peripheral wall. A rotating body disposed coaxially with each other, an insulating plate interposed between the first and second rotating parts of the rotating body and electrically insulating each other, and the rotating body A first brush that is slidably contacted with the slip ring of the first rotating part in conjunction with the rotation, and a second brush that is slidably contacted with the slip ring of the second rotating part in conjunction with the rotation of the rotating body. A slip ring device with a brush was proposed. This slip ring device makes a 1st brush and a ring inner peripheral wall contact, and makes a 2nd brush and a ring outer peripheral wall contact.

  However, each electrode ring is supplied with a large current from a DC power supply, and heat is generated by brush sliding contact, which may deteriorate the solid lubricating performance by graphite.

  In order to solve such a problem, according to one embodiment, a shaft body that is rotatably supported around an axis extending in the vertical direction, and each of the shaft bodies are stacked and disposed so as to be rotatable through a gap. A plurality of first electrode rings each having a slip ring formed on each outer peripheral wall, and a plurality of first electrode rings that are in contact with each outer peripheral wall of each of the first electrode rings and feed the same potential between the plurality of first electrode rings. Each of the first brushes, and an electrical insulator provided on one of the axial ends of the shaft body with respect to the first brush and the plurality of first electrode rings, A plurality of second electrode rings which are provided on the one end side of the insulator, and are rotatably stacked on the shaft body through a gap, each of which has a slip ring formed on each inner peripheral wall; Contact each inner wall of 2 electrode ring And a plurality of second brushes that supply the same potential between the plurality of second electrode rings and different from the potential, and the second brush contacts the inner peripheral wall of the second electrode ring. And a heat radiating member provided radially outward of the shaft body from the outer peripheral wall of the second electrode ring, and the heat radiating member radiates the heat to the second brush. A slip ring device is provided which receives heat from the outer peripheral wall opposite to the surface and dissipates heat.

  Further, according to another embodiment, a shaft body rotatably supported around a shaft extending in the vertical direction, and each of the shaft bodies are stacked so as to be rotatable via a gap, and slip to each inner peripheral wall. A plurality of second electrode rings in which a ring is formed, and a plurality of second brushes that are in contact with the respective inner peripheral walls of these second electrode rings and that feed the same potential between the plurality of second electrode rings An electrical insulator provided on the other end side of the axial ends of the shaft body with respect to the second brush and the plurality of second electrode rings, and the insulator more than the insulator, respectively. A plurality of first electrode rings which are provided on the other end side, are rotatably arranged on the shaft body via a gap, and each of the first electrode rings has a slip ring formed on each outer peripheral wall; A plurality of first electric power contacts the outer peripheral wall; A plurality of first brushes that supply the same potential between the rings and a potential different from the potential, and receive heat generated by the first brush coming into contact with the outer peripheral wall of the first electrode ring; An element attached to the inner peripheral wall of the first electrode ring, and the element receives the heat from the inner peripheral wall opposite to the contact surface of the first brush. A ring device is provided.

It is a perspective view of the slip ring device concerning an embodiment. It is the perspective view which looked at the slip ring device concerning an embodiment from the lower part in the state where the cover was removed. It is a front view of the outer ring simple substance containing the 1st electrode ring of the slip ring device concerning an embodiment, the 2nd electrode ring, and an insulator. It is a top view of the slip ring device concerning an embodiment. It is a bottom view of the slip ring device concerning an embodiment. It is a front view of the slip ring apparatus which concerns on a prior art example. It is a top view of the slip ring device concerning other embodiments. It is a bottom view of the slip ring device concerning other embodiments.

Hereinafter, a slip ring device according to an embodiment will be described with reference to FIGS. 1 to 7. In the drawings, the same portions are denoted by the same reference numerals, and redundant description is omitted.
FIG. 1A is a perspective view of a slip ring device according to an embodiment. FIG.1 (b) is the perspective view which looked at the slip ring apparatus of the state which removed the cover from upper direction. FIG. 2 is a perspective view of the slip ring device with the cover removed as viewed from below. In FIG. 2, the outer ring when the upper plate is attached with the number of electrode ring stages increased as appropriate is arranged. It is shown. FIG. 3 is a front view of a single outer ring. FIG. 4A is a top view of a slip ring device showing an arrangement structure of inner and outer rings, brushes, and brush holders. FIG. 4B is a bottom view of the slip ring device showing the arrangement structure of the inner and outer rings and the like. 4A and 4B show an example of the structure of the same slip ring device with the cover removed, and the arrow A in FIGS. 4A and 4B corresponds to the front direction in FIG. In these drawings, elements having the same reference numerals represent the same elements.

  The slip ring device 1 is a vertical rotating body device that transmits power supply power and signals via a plurality of annular electrode rings arranged in a coaxial manner around a longitudinal axis and a plurality of brush groups. is there. The slip ring device 1 uses all the upper half of the plurality of electrode rings as a ground potential slip ring, and adds all the lower half of the electrode rings via an insulating insulator provided in the center in the height direction. Used as a potential slip ring. In the present embodiment, the slip ring device 1 has a structure in which the upper half ground potential electrode rings and the lower half positive potential electrode rings are individually cooled among all the electrode rings. .

  The slip ring device 1 includes a shaft body (rotating shaft) 101 that receives a driving force from a driving mechanism (not shown) and rotates in the vertical axis direction, and a hollow cylindrical outer ring 10 that rotates with the rotation of the shaft body 101. The inner ring 18 disposed inside the outer ring 10 and the cover 19 that covers the outer periphery of the outer ring 10 are provided.

  The shaft body 101 is a rotor shaft. The outer ring 10 is a power stage ring for supplying DC power from a power source connected to the slip ring device 1 to, for example, an antenna directing device connected to the slip ring device 1. The power supply has a hot terminal for positive potential and a return terminal for ground potential. The inner ring 18 is a signal stage ring for signal transmission. The inner ring 18 is fixed to the outer peripheral surface of the shaft body 101. The inner ring 18 and the outer ring 10 are inserted into each other so that the inner peripheral surface of the outer ring 10 does not contact the outer peripheral surface of the inner ring 18.

  Of the power source power and signals that can be transmitted by the slip ring device 1, the power source power transmission function will be described. As shown in FIG. 3, the outer ring 10 is a rotating body and is a two-stage ground to which a ground potential is applied. Between the electrode ring 111 (second electrode ring), a two-stage plus electrode ring 121 (first electrode ring) that is a rotating body and to which a plus potential is applied, and between the lower ground electrode ring 111 and the upper plus electrode ring 121 And an insulating plate 13 (insulator) that electrically insulates. Reference numeral 20 denotes a flange portion.

  The two-stage ground electrode ring 111 is cylindrical and constitutes the ground electrode stage ring 11. The ground electrode rings 111 are separated by a gap. The two-stage positive electrode ring 121 is also cylindrical and constitutes the positive electrode step ring 12. The positive electrode rings 121 are separated from each other via a gap. Both the ground electrode step ring 11 and the plus electrode step ring 12 have a two-layer cylindrical shape in appearance. In the outer ring 10, the shaft body 101 is rotatably supported by the fixed body 15 via a bearing 14, and a rotational force can be applied via a drive mechanism and a transmission mechanism (not shown).

  The insulating plate 13 has a hollow portion around the axis and has a substantially donut shape in appearance. Wear powder, thread-like metal pieces, chips and the like from the ground electrode ring 111 can be dropped onto the fixed body 15 through the hollow portion. The outer diameter dimension of the insulating plate 13 is larger than both the outer diameter dimension of the ground electrode step ring 11 and the outer diameter dimension of the plus electrode step ring 12. The insulating plate 13 has a sufficient thickness in the height direction in order to insulate the ground electrode step ring 11 and the plus electrode step ring 12 from each other. For example, a synthetic resin molding is used for the insulating plate 13. The insulating plate 13 is located on the upper end side of the shaft body 101 with respect to each brush 17 and each plus electrode ring 121, and is located on the lower end side of the shaft body 101 with respect to each brush 16 and each ground electrode ring 111.

  The two-stage ground electrode ring 111 is made of a metal cylinder, and has an inner inner peripheral wall surface and an outer outer peripheral wall surface. The inner peripheral wall is subjected to, for example, two parallel rows of silver plating. The two rows of silver plating each have a width along the vertical direction, and a gap is provided between the silver platings. The strip-shaped silver plating is formed around the inner peripheral wall surface of the ring. When the upper half of the outer ring 10 is viewed from above, as shown in FIG. 4A, two first brushes 16 each formed of silver graphite or the like are provided inside the ground electrode ring 111. These brushes 16 are respectively held by the brush holders 21 in contact with the inner peripheral surface of each ground electrode ring 111. Each brush 16 is a stationary object.

  The material of the brush 16 has a component in which graphite is mixed with silver. The brush 16 is formed in a chip shape by sintering and hardening this component. The orientation of the brush 16 is given by this graphite. The orientation refers to the property that the brush slides in the vertical direction perpendicular to the circumferential direction on the ring outer peripheral surface or the ease of sliding.

  The two brush holders 21 are made of an insulating material. Each brush holder 21 is juxtaposed in the vertical direction, and corresponds to the two-stage ground electrode ring 111. These brush holders 21 are provided with terminals and contacts for conducting with the brush 16 and terminals and contacts for conducting with the power source. The wiring material to the power source is wired so as to pass through a gap space between the inner peripheral surface of the ground electrode ring 111 and the outer peripheral surface of the inner ring 18. A plate-like brush mounting plate 22 is erected in the gap space. Two brush holders 21 are attached to the brush attachment plate 22. The lower end portion of the brush mounting plate 22 is fixed to the fixed body 15 or a support member extending upward from the fixed body 15. The plurality of brushes 16 form a group of brushes while being fixed to the brush holder 21. The vertical position of each brush 16 is determined according to the height of the silver plating width on the inner peripheral surface of the ring. These brushes 16 and the inner peripheral wall of the two-stage ground electrode ring 111 constitute a slip ring, and a ground (GND) potential is applied to each slip ring.

  The brush holder 21 will be described in detail. The brush holder 21 is a rod body or an elongated thin plate, and has a shape in which two middle portions of the rod or plate are bent in the same direction. Of the entire brush holder 21, the brushes 16 are respectively attached to the tips of the arm portions that expand from the portion that contacts the flat portion of the brush mounting plate 22 in a “C” shape when viewed from above. For example, an elastic force such as a spring or a leaf spring is applied to these arm portions from the outside toward the rotational axis of the outer ring 10, and each brush 16 is connected to the inner peripheral surface of the ring via a spring or the like. Can be pressed down. The shaft body 101 and the brush 16 are electrically coupled.

  In the present embodiment, the outer ring 10 has a pair of heat sinks 23 (heat dissipating members) disposed in open spaces in the vicinity of the outer peripheral wall surface of each ground electrode ring 111 so that the fin portions face each other. The slip ring device according to the conventional example is different from the slip ring device 1 in which the empty space is brought into contact with the outside air in that the brush is arranged on the outer periphery and does not have an empty space. The material of the heat sink 23 is substantially the same as that used for corrugated fins and the like. This material has excellent heat dissipation characteristics. Two heat sinks 23 are provided for the upper ground electrode ring 111 and the lower ground electrode ring 111, respectively, and the pair of heat sinks 23 are provided horizontally at two opposite locations on the circumference of the ring cross section. . These heat sinks 23 are attached to the plate surface on the axial center side of the heat sink attachment plate 24 (FIG. 2). In the example of FIG. 3, the two heat sinks 23 are attached to the fin portion so that a plurality of horizontal fin rows are arranged vertically. The heat sink mounting plate 24 is a plate that does not contact the inner peripheral surface of the cover 19 and the outer ring 10, and a connector, an outlet, and terminals are provided on the plate surface opposite to the shaft core of the heat sink 23. The heat sink mounting plate 24 is always stationary. When each brush 16 is disposed inside the ground electrode ring 111, the outside of the ground electrode ring 111 is in contact with outside air. A heat sink 23 or the like is attached in the vicinity of the portion where the brush 16 and the ring outer peripheral surface come into contact with each other to dissipate heat from the outside, thereby suppressing an increase in the temperature of the ground electrode ring 111. The cooling performance is improved by the radiation fins.

  The lower two-stage positive electrode ring 121 is a metal cylinder, and silver plating is applied to each outer peripheral wall. As shown in FIG. 4B, a heat transport element 25 is attached to the inner peripheral wall surface of each positive electrode ring 121. The element 25 is a heat conductive material such as a highly heat conductive material or a Beltier element. In the example shown in the figure, two elements 25 are provided in one positive electrode ring 121. These elements 25 are affixed at the same position in the ring height direction of the one-stage positive electrode ring 121 in a state of being in contact with the inner peripheral surface of the ring with a space therebetween. One end of a wire 26 (heat transport material) is connected to each element 25. The other end of the wire 26 exchanges heat with the outside air. The wire material 26 is, for example, a lead wire shape, a fiber shape, or a wire shape. As the material of the wire rod 26, a highly heat conductive material or a heat conductive material such as a Beltier element may be used. The wire 26 is provided on the inner peripheral surface of the plus electrode ring 121. The other end of the wire 26 having one end connected to the element 25 is connected to the fixed body 15 or a support member extending upward from the fixed body 15.

  The brush 17 (second brush) is in sliding contact with the ring outer peripheral surface of the positive electrode ring 121, and heat is generated between the ring outer peripheral surface and the brush 17. The inner circumferential surface of the ring opposite to the brush contact surface functions as a heat transfer surface. Two elements 25 per one positive electrode ring 121 receive heat from the ring outer peripheral surface by the ring inner peripheral surface. The wire rod 26 is routed so that the other end of the wire rod 26 is exposed to the outside air through the inside of the plus electrode step ring 12 through the opening below the plus electrode step ring 12. Heat exchange with the outside air becomes possible, and temperature rise due to internal heat generation of the outer ring 10 is suppressed. The element 25 directly cools the inside of the ring (opposite the brush contact surface). The outer ring 10 can be efficiently radiated and cooled from the inside, and the rise in heat can be suppressed.

  In the ground electrode ring 111, one of the inside and outside of the ring is a space for brush contact, and the other of the inside and outside of the ring is a space for cooling the generated heat. The ground electrode ring 111 has a double structure in which two spaces are used inside and outside the ring. The positive electrode ring 121 also has a double structure inside and outside the ring.

  As shown in FIGS. 2, 4A, and 4B, the slip ring device 1 includes, for example, four pillars 27 erected in parallel vertically on the outer peripheral side of the outer ring 10, and a lower side in the height direction. Between the two pillars 27 and the two plate-like brush mounting plates 28 (only one is shown), and between the two pillars 27 on the upper side in the height direction. Two plate-like heat sink mounting plates 24 (only one is shown), a plurality of brush holders 29 fixed to the plate surface on the axis side of each brush mounting plate 28, and these brushes Two brushes 17 provided at each one end and each other end of the holder 29 are provided. These brushes 17 constituting a group of brushes and the outer peripheral surface of the two-stage positive electrode ring 121 constitute a slip ring, and a positive potential is applied to each slip ring.

  Each pillar 27 is a stationary object and is always stationary with respect to the rotating body. The upper portions of these pillars 27 are fixed to the annular flange surface 20 a of the flange portion 20. The flange portion 20 is a stationary object and is always stationary with respect to the rotating body. The brush mounting plate 28 is always stationary, and a connector, an outlet, and terminals are provided on the plate surface opposite to the shaft core. The plurality of brush holders 29 are made of an insulating material, and these brush holders 29 are juxtaposed in the vertical direction. These brush holders 29 are provided with terminals and contacts that are electrically connected to the brush 17 and terminals and contacts that are electrically connected to the power supply side. The brush 17 is made of a material having a component in which graphite is mixed with silver, and this component is sintered and hardened to form a chip shape. An upper support 30 and a fixed body 31 are provided on the flange surface 20b side on the opposite surface side of the annular flange surface 20a. Both the upper support 30 and the fixed body 31 are rotating bodies, and these rotate with the rotation of the outer ring 10. A bearing or the like is provided between the upper support 30 and the flange portion 20. Each brush 17 provided at both ends of a brush holder 29 extending from each pillar 27 comes into contact with and slides on the outer peripheral conductive portion of the outer ring 10 that is driven to rotate, and is electrically coupled to the outer ring 10. ing.

  When the plus wiring for hot and the ground wiring for return are connected between the slip ring device 1 having such a configuration and the DC power source, the slip ring device 1 is conditioned. The slip ring device 1 is applied with a current smaller than the current value during actual operation, and the surface of each brush 16 and the inner peripheral surface of the ground electrode ring 111 are rubbed together. The surface of each brush 17 and the outer peripheral surface of the plus electrode ring 121 are rubbed together. The current applied from the power source generates heat due to the metal resistance, and the contact portion between the brush and ring peripheral surface is electrically melted by the heat. The unevenness of the contact part is removed, and the surface roughness is reduced to such an extent that it cannot be visually recognized.

  Thereafter, the slip ring device 1 starts actual operation, and a current is applied from the DC power source. Each surface of the brush 16 and the brush 17 is covered with graphite, and silver is not in direct contact between the brush and the inner peripheral surface of the ring and between the brush and the outer peripheral surface of the ring. Move. The ground electrode ring 111 and the plus electrode ring 121 are electrically coupled to each other and transmit electric power. A solid lubricant layer is formed at the contact portion between the brush 16 and the inner peripheral surface of the ground electrode ring 111. A solid lubricating layer is formed at the contact portion between the brush 17 and the outer peripheral surface of the plus electrode ring 121. The outer ring 10 rotates while being lubricated inside and outside the ring.

  When the number of rotations accumulates, wear powder is generated on each of the outer peripheral surface side and the inner peripheral surface side. Further, chips of the brushes 16 and 17 shaped like hair may appear. The two-stage ground electrode ring 111 generates abrasion powder by sliding contact with the brush 16. Chips and wear powder fall from the inner peripheral wall of each ground electrode ring 111 through the inner diameter hole of the insulating plate 13, pass through the inner peripheral wall of each positive electrode ring 121, and fall on the lower fixed body 15.

  The two-stage positive electrode ring 121 generates abrasion powder by sliding contact with the brush 17. The wear powder falls on the fixed body 15 below the outer peripheral wall of each positive electrode ring 121. Wear powder is dispersed and falls through two paths, the inner side and the outer side of the outer ring 10. Thereby, generation | occurrence | production of the short circuit of all the paths by the abrasion powder in the slip ring structure laminated | stacked can be prevented. Short circuit all means dead short. In the slip ring device 1 according to the present embodiment, it is possible to promote the prevention of insulation failure due to the occurrence of this all-circuit short circuit and the like, and it is possible to ensure high-quality electrical coupling over a long period of time. .

  The outer ring 10 has a structure in which the inside and outside of the cylinder are doubled. With respect to the upper ground electrode ring 111, the heat sink 23 is located outside the outer peripheral surface of the ground electrode ring 111, which is the opposite side of the brush contact surface on which the brush 16 slides on the inner peripheral surface of the ground electrode ring 111. For this reason, it becomes possible to efficiently radiate and cool from the opposite side of the brush contact surface.

  In general, brush tips such as the brushes 16 and 17 require lubrication by moisture at the contact portion between the brush tip and the ring, and therefore humidity is required in the rotating body device. The wear rate of brush tips accelerates as humidity decreases. The wear rate is a wear rate due to friction, and indicates a reduction rate of the weight of the brush tip obtained by comparing the weight of the brush tip before use with the weight of the same brush tip after use. When cold air or the like is applied directly to the outer peripheral surface, inner peripheral surface or brush tip of the electrode ring, the water film on the ring surface may be lost, and the metal wear powder may dry out, leading to abnormal brush wear. When the brush is abnormally worn, the wear powder increases and the life of the slip ring is shortened.

  On the other hand, in the slip ring device 1 according to the present embodiment, the temperature increase of the ground electrode ring 111 itself can be suppressed without drying the ring surface of the ground electrode ring 111. In particular, the temperature rise at the contact portion between the ring outer peripheral surface and the brush 16 can be suppressed.

  As shown in FIG. 4A, when the brush 16 is arranged on the inner side of the ring, the outer side of the ring is in contact with the outside air, so heat can be radiated from the outer side of the ring by attaching a heat sink 23 or the like to the ground electrode ring 111. The temperature rise of the ground electrode ring 111 can be suppressed. In this way, the cooling performance by the heat radiating fins can be improved.

  As shown in FIG. 4B, when the brush 17 is arranged on the outer side of the ring, the plus electrode ring 121 uses a double structure, and the inside of the plus electrode ring 121 has a high thermal conductivity material or a heat conducting material such as a Beltier element. The element 25 made of a substance is brought into contact. A temperature increase due to internal heat generation can be suppressed by contacting the outer peripheral surface of the outer ring in the radial direction as viewed from the element 25 with the outside air, and the plus electrode ring 121 can be cooled from the inside. Since it is close to the contact portion and does not interfere with other parts, the inside of the contact surface between the positive electrode ring 121 and the brush 17 is effective. In this way, the cooling performance can be improved by the high heat conductive material. Improvement of heat dissipation can also be expected by using a heat pipe or a forced air cooling device instead of the wire material 26, or by using the wire material 26 in combination with a heat pipe or a forced air cooling device.

  During operation of the slip ring device 1, the temperature of the ground electrode ring 111 and the plus electrode ring 121 does not always rise evenly over the entire ring. In the slip ring device 1, the temperature at the contact portion with the brush 16 or the brush 17 is higher than the temperature at the remaining portion. On the upper side, heat is dissipated by fins, and on the lower side, an element 25 for releasing heat is attached inside the positive electrode ring 121 and heat is transported by the wire 26. For this reason, the heat from the site | part which becomes high temperature can be released, and efficient cooling can be performed.

  FIG. 5 is a front view of a vertical slip ring device according to a conventional example. The outer ring constituting the slip ring device 200 has an electrode step ring 250 for DC high power, in which electrode rings 210 and 220 are laminated coaxially. In order to improve the insulation performance between the electrode rings 210 and 220 having different potentials, an insulating plate 230 is interposed between the rings. The slip ring device 200 is electrically connected by simultaneously sliding the brush 240 provided on the fixed side. Since the slip ring device 20 has other electrode rings at the lower part of each electrode ring, a short circuit is likely to occur in the lower stage of the slip ring device 200. In the electrode step ring 250, in addition to sliding wear, metal wear powder is generated due to the influence of current, and this wear powder causes a short circuit in the entire path between the electrode rings 210 and 220 having different potentials. When the insulating plate 230 is inserted between the rings, the abrasion powder accumulates, and the brush 240 may ride on the metal block formed on the outer peripheral surface to form an electrical path and generate a spark.

  When the silver plating on the outer peripheral surface is melted by the high temperature and the slip ring device 200 is cooled, a metal lump is generated by the melted metal, and the ring surface is roughened. The metal mass changes the value of the gap between the brush 240 and the ring outer peripheral surface. When the pressing force applied to the outer peripheral surface from the brush 240 in sliding contact is reduced for a moment, the brush 240 is lifted from the outer peripheral surface. The electric field in the vicinity of the outer peripheral surface changes, charge concentration occurs at any point, and sparks and arcs occur again.

  On the other hand, in the slip ring device 1, it is possible to radiate heat while maintaining the atmosphere at the time of contact with the ring surface by cooling from the surface opposite to the surface with which the brush 17 contacts. Atmosphere refers to temperature and humidity. The ring surface is cooled by the cooling structure of the slip ring device 1, and the ring surface does not exceed the melting point of silver plating. Moreover, since excessive rise in temperature is prevented, it is possible to avoid excessively drying the ring surface. An increase in temperature in the slip ring device 1 can be suppressed, and the slip ring device 1 can continue to maintain a sufficient humidity with respect to temperature fluctuation. By adjusting to an appropriate temperature with respect to the humidity, it is possible to draw out the lubricating performance by graphite using a film of water obtained from moisture in the air. Instead of humidity, which is difficult to control, temperature can be used to control heat dissipation and cooling, increasing convenience in handling.

(Modification)
(1) A plurality of first brushes 16 on the upper side of the outer ring 10 and a plurality of lower brushes 17 on the lower side may be provided for each outer ring 10. FIG. 6 shows a top view of a slip ring device according to another embodiment. FIG. 7 shows a bottom view of the apparatus.

  As a result, when the outer ring 10A is driven to rotate, the four brushes 16 contact and slide against the inner peripheral surface of one ground electrode ring 111 as shown in FIG. As shown in FIG. 7, the four brushes 17 slide in contact with the outer peripheral surface of one plus electrode ring 121. Electrical coupling is performed between the outer ring 10A and the power source.

(2) In the above embodiment, the example using the outer ring 10 in which the ground electrode step ring 11 is stacked on the plus electrode step ring 12 has been described. However, the outer ring is added on the ground electrode step ring 11. The electrode step ring 12 may be stacked. For example, each of the ground electrode step ring 11 and the plus electrode step ring 12 may be provided with one step or three or more steps of slip rings. Alternatively, the brush 16 may be opposed to the outer peripheral wall of the ground electrode step ring 11 and the brush 17 may be opposed to the inner peripheral wall of the plus electrode step ring 12. The effect of changing the stacking arrangement of these electrode rings or electrode step rings is the same as that of the above embodiment.

(3) In the above embodiment, the outer ring 10 uses the upper ground electrode ring 111 as a ground potential and the lower positive electrode ring 121 as a positive potential. The combination of the polarity and the potential and polarity of the lower electrode ring may be a minus potential and a ground potential, a ground potential and a minus potential, or a minus potential and a plus potential, a plus potential and a minus potential, a minus potential and a minus potential. It is good. The effects obtained by changing these potentials and polarities are the same as those of the above embodiment.

(4) The shape, structure, number, position, etc. of the heat sink 23 as a heat radiating member can be variously changed. Instead of the heat sink 23, a forced air cooling device such as a heat pipe or a blower may be used as the heat radiating member. For example, the heat sink 23 and the ground electrode ring 111 may be directly cooled by cold air from a blower. In this way, the cooling efficiency can be further improved. Moreover, you may use together the heat sink 23, a heat pipe, and a forced air cooling device. The position, number, size, and the like of the heat transport element 25 can be variously changed. The heat dissipating member and the heat transport element 25 may be used in combination with a water cooling device. The shape and structure of the pillars such as the pillar 27, the ring thickness of the outer ring, the inner ring, and the like can be variously changed, and various modifications can be made without departing from the scope of the invention in the implementation stage. The superiority of the slip ring device according to the present embodiment with respect to the invention that has only been implemented with these changes is not impaired.

(5) Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Slip ring device 10, 10A ... Outer ring, 11 ... Ground electrode step ring, 12 ... Positive electrode step ring, 13 ... Insulating plate (insulator), 14 ... Bearing, 15 ... Fixed body, 16 ... Brush (No. 1) 1 brush), 17 ... brush (second brush), 18 ... inner ring, 19 ... cover, 20 ... flange portion, 20a ... annular flange surface, 20b ... flange surface, 21 ... brush holder, 22 ... brush mounting plate 23 ... Heat sink (heat radiating member), 24 ... Heat sink mounting plate, 25 ... Element (heat transport material), 26 ... Wire rod, 27 ... Pillar, 28 ... Brush mounting plate, 29 ... Brush holder, 30 ... Upper support, 31 ... fixed body, 101 ... shaft, 111 ... ground electrode ring (second electrode ring), 121 ... positive electrode ring (first electrode ring).

Claims (5)

A shaft body rotatably supported around an axis extending in the vertical direction;
A plurality of first electrode rings, each of which is rotatably stacked on the shaft body via a gap, and a slip ring is formed on each outer peripheral wall;
A plurality of first brushes that contact each outer peripheral wall of each of the first electrode rings and feed the same potential between the plurality of first electrode rings;
An electrical insulator provided on one of the axial ends of the shaft body with respect to the first brush and the plurality of first electrode rings; and
A plurality of second electrode rings that are provided on the one end side than the insulators, are rotatably stacked on the shaft body via a gap, and have a slip ring formed on each inner peripheral wall;
A plurality of second brushes that are in contact with the respective inner peripheral walls of these second electrode rings, respectively, and that feed power of the same potential between the plurality of second electrode rings and different from the potential;
The second brush dissipates heat generated by contacting the inner peripheral wall of the second electrode ring, and a heat dissipating member provided radially outward of the shaft body from the outer peripheral wall of the second electrode ring; With
The heat dissipation member radiates heat by receiving the heat from the outer peripheral wall opposite to the contact surface of the second brush. A shaft body rotatably supported around an axis extending in the vertical direction;
A plurality of second electrode rings, each of which is rotatably stacked on the shaft body via a gap, and a slip ring is formed on each inner peripheral wall;
A plurality of second brushes that contact each inner peripheral wall of each of these second electrode rings and feed the same potential between the plurality of second electrode rings;
An electrical insulator provided on the other end side of the axial ends of the shaft body with respect to the second brush and the plurality of second electrode rings; and
A plurality of first electrode rings which are provided on the other end side than the insulators, are rotatably stacked on the shaft body via a gap, and have slip rings formed on the outer peripheral walls;
A plurality of first brushes that contact each outer peripheral wall of each of these first electrode rings, and that feed power of the same potential between the plurality of first electrode rings and different from the potential;
Receiving the heat generated when the first brush contacts the outer peripheral wall of the first electrode ring, and an element attached to the inner peripheral wall of the first electrode ring, and
This element receives the heat from the inner peripheral wall on the side opposite to the contact surface of the first brush.   A cover that covers the plurality of first electrode rings and the plurality of second electrode rings, and a cooling device that is provided between an inner wall of the cover and an outer peripheral wall of the second electrode ring, and cools the heat. The slip ring device according to claim 1, wherein   3. The slip ring device according to claim 2, wherein the element material of the element is a highly heat conductive material or a heat conductive material.   3. The slip ring according to claim 2, wherein the element is connected to a heat transport material that transports the heat inside the plurality of first electrode rings and exchanges heat with the outside air. apparatus.

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