ELECTRIC BRUSH MODULE AND X-RAY CT APPARATUS
An electric brush module according to an embodiment is used in an X-ray Computed Tomography (CT) apparatus including a slip ring and a gantry fixed part and includes an electric brush holder, an electric brush, and a wear debris collecting mechanism. The electric brush holder is provided in the gantry fixed part, has an arc shape with an opening part formed therein, and has a plate-like shape. The electric brush is attached to the electric brush holder and is configured to transmit either electric power or a signal, by being in contact with the slip ring. The wear debris collecting mechanism is attached to the electric brush holder, so as to form a substantially hermetically-closed space, together with the electric brush and the electric brush holder.
1 . An electric brush module used in an X-ray Computed Tomography (CT) apparatus including a slip ring and a gantry fixed part, the electric brush module comprising:
an electric brush holder that is provided in the gantry fixed part, has an arc shape with an opening part formed therein, and has a plate-like shape;
an electric brush attached to the electric brush holder and configured to transmit either electric power or a signal, by being in contact with the slip ring; and
a wear debris collecting mechanism attached to the electric brush holder, so as to form a substantially hermetically-closed space, together with the electric brush and the electric brush holder.
2 . The electric brush module according to claim 1 , wherein
the wear debris collecting mechanism includes:
a dust collecting mechanism attached, on a radially outer side of the electric brush holder, to a surface on one of sides of the electric brush holder on which the electric brush is attached, so as to be positioned in a vicinity of a contact part between the electric brush and the slip ring;
an air passage partition attached to an end section along a circumferential direction of the opening part of the electric brush holder;
a sealing plate attached, on a surface of the electric brush holder on a side opposite from the one of the sides on which the electric brush is attached, to a section of the electric brush holder positioned on the radially outer side, so as to extend approaching the slip ring from the radially outer side; and
a wear debris partition attached to a section of the electric brush holder positioned on a radially inner side, so as to oppose the sealing plate while the air passage partition is interposed therebetween.
3 . The electric brush module according to claim 2 , wherein
the dust collecting mechanism includes:
a casing of which one face is attached to the electric brush holder and which has formed, on an inside thereof, a chamber that opens onto a face opposing the face attached to the electric brush holder, the casing having a debris entrance for sucking wear debris formed on a surface positioned on the radially inner side in a state where the dust collecting mechanism is attached to the electric brush holder, and the casing having an opening formed on a surface positioned on the radially outer side in a state where the dust collecting mechanism is attached to the electric brush holder;
an adsorbent cotton detachably attached to the chamber of the casing; and
an air suction mechanism attached to the casing so as to communicate with the opening.
4 . The electric brush module according to claim 3 , wherein
the air passage partition is formed to have an L-shaped cross-section and extends along a radial direction, from a section positioned radially more inward than a radially inward section of a contact part between the electric brush and the slip ring, to a section positioned radially more outward than a radially outward portion of the contact part between the electric brush and the slip ring,
an end section of the air passage partition positioned on the radially outer side extends approaching an end section of the debris entrance positioned on a circumferentially outer side, and
the air passage partition extends, from a surface of the electric brush holder, in a direction in which the electric brush is attached, along a direction perpendicular to a plate plane direction of the electric brush holder.
5 . The electric brush module according to claim 2 , wherein
a plate plane of the sealing plate extends along an arc of which an arc degree is equal to that of the electric brush holder,
an arc length of the sealing plate is longer than an arc length of the electric brush holder when measured in a location of a same radius, and
the sealing plate is attached to a position more radially outward than the opening part of the electric brush holder.
6 . The electric brush module according to claim 2 , wherein
a cross-section of the sealing plate in a radial direction is inverted L-shaped,
a fin sheet is formed on the sealing plate toward an inside of the arc, and
the sealing plate has formed therein a cutout part for accommodating the dust collecting mechanism.
7 . The electric brush module according to claim 2 , wherein
a plate plane of the wear debris partition extends along an arc of which an arc degree is equal to that of the electric brush holder,
an arc length of the wear debris partition is equal to an arc length of the electric brush holder when measured in a location of a same radius, and
the wear debris partition is attached to a position radially more inward than the opening part of the electric brush holder.
8 . The electric brush module according to claim 2 , wherein
a cross-section of the wear debris partition in a radial direction is inverted L-shaped, and
a fin sheet is formed on the wear debris partition toward an outside of the arc.
9 . The electric brush module according to claim 2 , wherein
the wear debris partition is provided so as to extend approaching the slip ring in a direction perpendicular to a plate plane direction of the electric brush holder, and
the wear debris partition is positioned apart from the slip ring by 5 mm or longer, in a direction perpendicular to the surface of the electric brush holder.
10 . The electric brush module according to claim 3 , wherein the air suction mechanism is one selected from among an axial fan, a centrifugal fan, and a bladeless fan.
11 . The electric brush module according to claim 3 , further comprising: a soundproof mechanism provided for the casing so as to surround the air suction mechanism, while keeping an exhaust port exposed.
12 . The electric brush module according to claim 11 , wherein the soundproof mechanism is formed as a hexahedron of which two adjacently-positioned faces are open.
13 . The electric brush module according to claim 3 , further comprising: a wear debris blocking shield extending from a separator positioned between the casing and the air suction mechanism, in a direction toward where an exhaust port of the air suction mechanism is positioned, so as to block the exhaust port of the air suction mechanism.
14 . An X-ray CT apparatus comprising:
a gantry fixed part;
a slip ring; and
an electric brush module, wherein
the electric brush modules includes
an electric brush holder that is provided in the gantry fixed part, has an arc shape with an opening part formed therein, and has a plate-like shape;
an electric brush attached to the electric brush holder and configured to transmit either electric power or a signal, by being contact in the slip ring; and
a wear debris collecting mechanism attached to the electric brush holder, so as to form a substantially hermetically-closed space, together with the electric brush and the electric brush holder.
15 . The X-ray CT apparatus according to claim 14 , further comprising: a slip ring sealing mechanism provided along the slip ring, for a section of the slip ring other than a section overlapping with the electric brush module, the slip ring sealing mechanism surrounding the slip ring so as to substantially seal the slip ring.
16 . The X-ray CT apparatus according to claim 15 , wherein
the slip ring sealing mechanism includes:
a slip ring shell attached to the gantry fixed part so as to surround a radially outer side of the slip ring and a side of the slip ring opposite from one of sides opposing the gantry fixed part; and
a slip ring shell sealing plate attached to the slip ring shell so as to cover a radially inner side of the slip ring.
17 . The X-ray CT apparatus according to claim 16 , wherein
the slip ring sealing mechanism further comprises a hermetically-closing fixed plate attached to the gantry fixed part while being positioned between the slip ring and the gantry fixed part, and
the slip ring shell is attached to the hermetically-closing fixed plate so as to surround the radially outer side of the slip ring and the side of the slip ring opposite from the one of the sides opposing the gantry fixed part.
18 . The X-ray CT apparatus according to claim 17 , wherein the hermetically-closing fixed plate is attached to the gantry fixed part, in such a manner that at least a part thereof has a gap from the gantry fixed part.
19 . The X-ray CT apparatus according to claim 16 , wherein there is a distance of 5 mm or longer between the slip ring shell sealing plate and a rim of the slip ring on the radially inner side of a surface positioned on the one of the sides opposing the gantry fixed part.
20 . The X-ray CT apparatus according to claim 18 , wherein the gap between said at least a part of the hermetically-closing fixed plate and the gantry fixed part is 5 mm or larger.