Fragment prevention and containment for a bearing device for use in a pump
AssigneeEbara Corporation
InventorsMakoto Kobayashi, Masakazu Yamamoto, Yoshio Miyake, Koji Isemoto, Keita Uwai, Yoshiaki Miyazaki
Life of this patent
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Abstract
A bearing device for use in a pump which has a bearing member composed of a hard and brittle material made of ceramic such as silicon carbide (SiC). The bearing device has a bearing housing, a ceramic bearing member housed in the bearing housing and supporting a shaft, an elastic material around the ceramic bearing member for preventing the ceramic bearing member from being broken, and a thrust collar for preventing fragments of the ceramic bearing member from being scattered when the ceramic bearing member is broken.
Claims24
A bearing device for use in a pump having a bearing assembly for supporting a rotating body, the rotating body having a shaft, comprising:
- a bearing housing;
- a stationary bearing member formed of a brittle material and housed in said bearing housing and supporting said shaft, said stationary bearing member having an outer diameter which substantially corresponds to an inner diameter of said bearing housing;
- and
- a thrust collar fixed to said shaft and receiving a thrust force, said thrust collar being located inside said bearing housing;
- wherein said bearing housing and said thrust collar are provided so as to enclose said stationary bearing member.
A bearing device for use in a pump having a bearing assembly for supporting a rotating body, the rotating body having a shaft, comprising:
- a bearing housing;
- a stationary bearing member formed of a brittle material and housed in said bearing housing and supporting said shaft, said stationary bearing member having an outer diameter which substantially corresponds to an inner diameter of said bearing housing;
- and
- a rotatable bearing member fixed to said shaft so as to be rotatable with said shaft;
- wherein said rotatable bearing member comprises a rotatable radial bearing member having a coefficient of linear thermal expansion smaller than that of said shaft, said rotatable radial bearing member is in sliding contact with said stationary bearing member, and said rotatable radial bearing member is fixed to said shaft by means including a double nut for absorbing dimensional tolerances along the axis of the shaft.
A pump having a bearing device, comprising:
- a pump casing;
- a canned motor in said pump casing, said canned motor comprising:
- a motor frame housing a stator;
- a rotor rotatably supported by said motor frame and including a shaft having axially opposite end portions;
- and
- a bearing device disposed on one of said axially opposite end portions of said shaft, said bearing device comprising:
- a bearing housing;
- a stationary bearing member formed of a brittle material and housed in said bearing housing and supporting said shaft, said stationary bearing member having an outer diameter which substantially corresponds to an inner diameter of said bearing housing;
- and
- a thrust collar fixed to said shaft and receiving a thrust force, said thrust collar being located inside said bearing housing,
- wherein said bearing housing and said thrust collar are provided so as to enclose said stationary bearing member.
A pump having a bearing device, comprising:
- a pump casing;
- a canned motor in said pump casing, said canned motor comprising:
- a motor frame housing a stator;
- a rotor rotatably supported by said motor frame and including a shaft having a pair of axially opposite end portions;
- and
- a bearing device disposed on one of said axially opposite end portions of said shaft, said bearing device comprising:
- a bearing housing;
- a stationary bearing member formed of a brittle material and housed in said bearing housing and supporting said shaft, said stationary bearing member having an outer diameter which substantially corresponds to an inner diameter of said bearing housing;
- and
- a rotatable bearing member fixed to said shaft so as to be rotatable with said shaft;
- wherein said rotatable bearing member comprises a rotatable radial bearing member having a coefficient of linear thermal expansion smaller than that of said shaft, said rotatable radial bearing member is in sliding contact with said stationary bearing member, and said rotatable radial bearing member is fixed to said shaft by means including a double nut for absorbing dimensional tolerances along the axis of the shaft.
The pump according to claim 28, wherein said rotatable bearing member comprises a rotatable thrust bearing member, said rotatable thrust bearing member is held by a thrust disk, and at least one said of rotatable thrust bearing member and said thrust disk has a through hole forming a liquid passage capable of introducing liquid in the pump into a sliding portion of said rotatable bearing member.
Dependencies are inferred from the claim text.