Magnet pumps

Claim 2

A magnet pump, comprising: a closed type impeller having a first portion with a permanent magnet embedded therein, a plurality of vanes attached to said first portion, and a main plate attached to said vanes, said impeller being rotatably driven by a magnetic force from the outside of said impeller, said permanent magnet being disk shaped and oriented perpendicular to a rotational axis of said impeller; a pump casing including a suction port, a discharge port and a pumping chamber in which the impeller is contained, the impeller being rotatably contained in said pumping chamber of said casing and having the permanent magnet embedded therein; a bearing provided on the suction side of the impeller and having a stationary part fixed to said casing and a moving part fixed to said impeller, an outer diameter of said bearing being smaller than an inner diameter of said permanent magnet embedded in said impeller, said bearing being shaped to support radial force and thrust force acting on said impeller; a magnetic force driving mechanism constituting a means for affording the magnetic force on said permanent magnet within said impeller to rotatably drive the latter, said magnetic force driving mechanism being mounted on a non-liquid-contacting portion of said casing on a suction side of said impeller and facing said impeller in respect to the direction of the rotary shaft axis of said impeller; and a fluid inlet passage for communicating between said suction port and said pumping chamber, said fluid inlet passage being formed to pass through the center portion of said magnetic force driving mechanism and the center of the bearing as defined by the rotational axis of the impeller.

Claim 3

A magnet pump as set forth in claim 1, wherein the permanent magnet embedded in said impeller is contained in a container made of an inorganic material.

Claim 4

A magnet pump as set forth in any one of claims 1 or 2, wherein the material of said bearing is ceramic, and said bearing is formed in its sliding surface with grooves for generating dynamic pressure.

Claim 5

A magnet pump as set forth in claim 3, wherein said ceramic includes a substrate of silicon carbide sintered material and a thin layer of silicon carbide coated on the surface of the substrate by a thermal CVD process.

Claim 6

A magnet pump, comprising: a closed type impeller having a first portion with a permanent magnet embedded therein, a plurality of vanes attached to said first portion, and a main plate attached to said vanes, said impeller being rotatably driven by a magnetic force from the outside of said impeller, said permanent magnet being shaped and oriented perpendicular to a rotational axis of said impeller; a pump casing including a suction port, a discharge port and a pumping chamber in which the impeller is contained, the impeller being rotatably contained in said pumping chamber of said casing and having the permanent magnet embedded therein; a bearing provided on the suction side of the impeller and having a stationary part fixed to said casing and a moving part fixed to said impeller, an outer diameter of said bearing being smaller than an inner diameter of said permanent magnet embedded in said impeller, said bearing being shaped to support radial force and thrust force acting on said impeller; a magnetic force driving mechanism constituting a means for affording the magnetic force on said permanent magnet within said impeller to rotatably drive the latter, said magnetic force driving mechanism having a permanent magnet which is rotatable about said axis of said impeller and is mounted on a non-liquid-contacting portion of said casing on a suction side of said impeller, said permanent magnet of said magnetic force driving mechanism facing said impeller with respect to the direction of the rotary shaft axis of said impeller; and a fluid inlet passage for communicating between said suction port and said pumping chamber, said fluid inlet passage being formed to pass through the center portion of said magnetic force driving mechanism and the center of the bearing as defined by the rotational axis of the impeller.

Claim 7

A magnet pump, comprising: a closed type impeller having a first portion with a permanent magnet embedded therein, a plurality of vanes attached to said first portion, and a main plate attached to said vanes, said impeller being rotatably driven by a magnetic force from the outside of said impeller, said permanent magnet being shaped and oriented perpendicular to a rotational axis of said impeller; a pump casing including a suction port, a discharge port and a pumping chamber in which the impeller is contained, the impeller being rotatably contained in said pumping chamber of said casing and having the permanent magnet embedded therein; a bearing provided on the suction side of the impeller and having a stationary part fixed to said casing and a moving part fixed to said impeller, an outer diameter of said bearing being smaller than an inner diameter of said permanent magnet embedded in said impeller, said bearing being shaped to support radial force and thrust force acting on said impeller; a magnetic force driving mechanism constituting a means for affording the magnetic force on said permanent magnet within said impeller to rotatably drive the latter, said magnetic force driving mechanism having a permanent magnet which is rotatable about said axis of said impeller and is mounted on a non-liquid-contacting portion of said casing on a suction side of said impeller, said permanent magnet of said magnetic force driving mechanism facing said impeller with respect to the direction of the rotary shaft axis of said impeller; and a fluid inlet passage for communicating between said suction port and said pumping chamber, said fluid inlet passage being formed to pass through the center portion of said magnetic force driving mechanism and the center of the bearing as defined by the rotational axis of the impeller.

Claim 8

A magnet pump as set forth in claim 5, wherein the permanent magnet embedded in said impeller is contained in a container made of an inorganic material.

Claim 9

A magnet pump as set forth in any one of claims 5 or 6, wherein the material of said bearing is ceramic, and said bearing is formed in its sliding surface with grooves for generating dynamic pressure.

Claim 10

A magnet pump as set forth in claim 7, wherein said ceramic includes a substrate of silicon carbide sintered material and a thin layer of silicon carbide coated on the surface of the substrate by a thermal CVD process.

Claim 11

A magnet pump, comprising: a closed type impeller having a first portion with a permanent magnet embedded therein, a plurality of vanes attached to said first portion, and a main plate attached to said vanes, said impeller being rotatably driven by a magnetic force from the outside of said impeller, said permanent magnet being disk shaped and oriented perpendicular to a rotational axis of said impeller; a pump casing including a suction port, a discharge port and a pumping chamber in which the impeller is contained, the impeller being rotatably contained in said pumping chamber of said casing and having the permanent magnet embedded therein; a bearing provided on the suction side of the impeller and having a stationary part fixed to said casing and a moving part fixed to said impeller, an outer diameter of said bearing being smaller than an inner diameter of said permanent magnet embedded in said impeller, said bearing being shaped to support radial force and thrust force acting on said impeller; a magnetic force driving mechanism constituting a means for affording the magnetic force on said permanent magnet within said impeller to rotatably drive the latter, said magnetic force driving mechanism having a stator fixed to a non-liquid-contacting portion of said casing on a suction side of said impeller and facing said impeller with respect to the direction of the rotary shaft axis of said impeller; and a fluid inlet passage for communicating between said suction port and said pumping chamber, said fluid inlet passage being formed to pass through the center portion of said magnetic force driving mechanism and the center of the bearing as defined by the rotational axis of the impeller.

Claim 12

A magnet pump, comprising: a closed type impeller having a first portion with a permanent magnet embedded therein, a plurality of vanes attached to said first portion, and a main plate attached to said vanes, said impeller being rotatably driven by a magnetic force from the outside of said impeller, said permanent magnet being disk shaped and oriented perpendicular to a rotational axis of said impeller; a pump casing including a suction port, a discharge port and a pumping chamber in which the impeller is contained, the impeller being rotatably contained in said pumping chamber of said casing and having the permanent magnet embedded therein; a bearing provided on the suction side of the impeller and having a stationary part fixed to said casing and a moving part fixed to said impeller, an outer diameter of said bearing being smaller than an inner diameter of said permanent magnet embedded in said impeller, said bearing being shaped to support radial force and thrust force acting on said impeller; a magnetic force driving mechanism constituting a means for affording the magnetic force on said permanent magnet within said impeller to rotatably drive the latter, said magnetic force driving mechanism having a stator fixed to a non-liquid-contacting portion of said casing on a suction side of said impeller and facing said impeller with respect to the direction of the rotary shaft axis of said impeller; and a fluid inlet passage for communicating between said suction port and said pumping chamber, said fluid inlet passage being formed to pass through the center portion of said magnetic force driving mechanism and the center of the bearing as defined by the rotational axis of the impeller.

Claim 13

A magnet pump as set forth in claim 9, wherein the permanent magnet embedded in said impeller is contained in a container made of an inorganic material.

Claim 14

A magnet pump as set forth in any one of claims 9 or 10, wherein the material of said bearing is ceramic, and said bearing is formed in its sliding surface with grooves for generating dynamic pressure.

Claim 15

A magnet pump as set forth in claim 11, wherein said ceramic includes a substrate of silicon carbide sintered material and a thin layer of silicon carbide coated on the surface of the substrate by a thermal CVD process.

Claim 16

A magnet pump, comprising: a closed type impeller having a first portion with a permanent magnet embedded therein, a plurality of vanes attached to said first portion, and a main plate attached to said vanes, said impeller being rotatably driven by a magnetic force from the outside of said impeller, said permanent magnet being disk shaped and oriented perpendicular to a rotational axis of said impeller; a pump casing including a suction port, a discharge port and a pumping chamber in which the impeller is contained, the impeller being rotatably contained in said pumping chamber of said casing and having the permanent magnet embedded therein; a bearing provided on the suction side of the impeller and having a stationary part fixed to said casing and a moving part fixed to said impeller, an outer diameter of said bearing smaller than an inner diameter of said permanent magnet embedded in said impeller, said bearing being shaped to support radial, force and thrust force acting on said impeller; a magnetic force driving mechanism constituting a means for affording the magnetic force on said permanent magnet within said impeller to rotatably drive the latter, said magnetic force driving mechanism having a permanent magnet which is rotatable about said axis of said impeller and which is mounted on a non-liquid-contacting portion of said casing on a suction side of said impeller, said permanent magnet of said magnetic force driving mechanism facing said impeller with respect to the direction of the rotary shaft axis of said impeller; a stator being fixed to a non-liquid-contacting portion of said magnetic force driving mechanism opposite to said permanent magnet of the magnet force driving mechanism; and a fluid inlet passage for communicating between said suction port and said pumping chamber, said fluid inlet passage being formed to pass through the center portion of said magnetic force driving mechanism and the center of the bearing as defined by the rotational axis of the impeller.

Claim 17

A magnet pump, comprising: a closed type impeller having a first portion with a permanent magnet embedded therein, a plurality of vanes attached to said first portion, and a main plate attached to said vanes, said impeller being rotatably driven by a magnetic force from the outside of said impeller, said permanent magnet being disk shaped and oriented perpendicular to a rotational axis of said impeller; a pump casing including a suction port, a discharge port and a pumping chamber in which the impeller is contained, the impeller being rotatably contained in said pumping chamber of said casing and having the permanent magnet embedded therein; a bearing provided on the suction side of the impeller and having a stationary part fixed to said casing and a moving part fixed to said impeller, an outer diameter of said bearing smaller than an inner diameter of said permanent magnet embedded in said impeller, said bearing being shaped to support radial, force and thrust force acting on said impeller; a magnetic force driving mechanism constituting a means for affording the magnetic force on said permanent magnet within said impeller to rotatably drive the latter, said magnetic force driving mechanism having a permanent magnet which is rotatable about said axis of said impeller and which is mounted on a non-liquid-contacting portion of said casing on a suction side of said impeller, said permanent magnet of said magnetic force driving mechanism facing said impeller with respect to the direction of the rotary shaft axis of said impeller; a stator being fixed to a non-liquid-contacting portion of said magnetic force driving mechanism opposite to said permanent magnet of the magnet force driving mechanism; and a fluid inlet passage for communicating between said suction port and said pumping chamber, said fluid inlet passage being formed to pass through the center portion of said magnetic force driving mechanism and the center of the bearing as defined by the rotational axis of the impeller.

Claim 18

A magnet pump as set forth in claim 13, wherein the permanent magnet embedded in said impeller is contained in a container made of an inorganic material.

Claim 19

A magnet pump as set forth in any one of claims 13 or 14, wherein the material of said bearing is ceramic, and said bearing is formed in its sliding surface with grooves for generating dynamic pressure.

Claim 20

A magnet pump as set forth in claim 15, wherein said ceramic includes a substrate of silicon carbide sintered material and a thin layer of silicon carbide coated on the surface of the substrate by a thermal CVD process.