Vacuum cleaner

• US 5,027,469 A
• Filed: 04/03/1990
• Issued: 07/02/1991
• Est. Priority Date: 04/05/1989
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Arai, Jiro, Jyoraku, Fumio, Ishii, Yoshitaro, Kawamata, Mitsuhisa, Toyoshima, Hisanori
• Primary Examiner(s): MOORE, CHRISTOPHER K
• Application Number:
  US07/503,764
• Time in Patent Office: 455 Days
• Field of Search: 15/412, 15/339, 15/347, 15/352
• US Class Current: 15/339
• CPC Class Codes: A47L 5/22 with rotary fans
• CPC Class Codes: A47L 9/02 Nozzles suction nozzles for fluid transport B65G51/00
• CPC Class Codes: A47L 9/122 flat
• CPC Class Codes: A47L 9/22 Mountings for motor fan assemblies

Abstract

A vacuum cleaner comprising a fan motor disposed in a main body case thereof and having a motor with a permanent magnet stator or rotor, and a fan arranged to be rotated by the motor. A dust-collecting chamber collects dust suctioned into the main body case due to the rotation of the fan motor, and a dust-collecting filter causes the dust suctioned into the main body case to be caught in the dust-collecting chamber. A magnetic material adhesion preventing device is provided in a passage through which air flows due to rotation of the fan motor, with the magnetic material adhesion preventing device acting to prevent adhesion of fine dust composed of magnetic materials included in the air flow to a portion in the vicinity of the permanent magnet. As a result, adhesion of fine dust between the rotor and stator can be prevented thereby increasing the service life and the reliability of the vacuum cleaner.

Claims

1. A vacuum cleaner comprising:

a fan disposed in a main body case of the vacuum cleaner;

a fan motor for driving said fan and including a rotor or stator of a permanent magnet;

a dust-collecting chamber for collecting dust suctioned into said main body case due to rotation of said fan motor;

a dust-collecting filter for causing said dust suctioned into said main body case to be caught in said dust-collecting chamber; and

magnetic material adhesion preventing means disposed in an inlet passage of said fan motor, said magnetic material adhesion preventing means acting to prevent adhesion of fine dust composed of magnetic materials included in air flow to a vicinity of said permanent magnet.

2. A vacuum cleaner according to claim 1, wherein said magnetic material adhesion preventing means includes a fine-dust catching filter capable of catching said fine dust composed of said magnetic materials passing through said dust-collecting filter.

3. A vacuum cleaner according to claim 2, wherein said magnetic material adhesion preventing means is positioned between said dust-collecting filter and said fan motor.

5. A vacuum cleaner according to claim 1, wherein said magnetic material adhesion preventing means includes a body disposed in a nozzle communicated with said main body case and capable of catching suctioned dust composed of said magnetic materials.

4. A vacuum cleaner comprising:

a fan motor disposed in a main body case thereof and having a motor arranged in such a manner that its rotor or its stator uses a permanent magnet and a fan arranged to be rotated by said motor;

a dust-collecting chamber for collecting dust suctioned into said main body case due to rotation of said fan motor; and

a dust-collecting filter for causing said dust suctioned into said main body case to be caught in said dust collecting chamber,

wherein magnetic material adhesion preventing means is positioned between said fan and said motor, said magnetic material adhesion preventing means includes a fine-dust catching filter capable of catching said fine dust composed of magnetic materials passing through said dust-collecting filter, said magnetic material adhesion preventing means acting to prevent adhesion of fine dust composed of magnetic materials includes in said air flow to a portion in a vicinity of said permanent magnet.

6. A vacuum cleaner comprising:

a fan disposed in a main body case of the vacuum cleaner;

a fan motor for driving the fan and including a rotor of a permanent magnet;

a dust-collecting chamber disposed in a suction side of said fan motor and capable of collecting dust suctioned into said main body case due to a rotation of said fan motor;

a dust-collecting filter for causing said dust suctioned into said main body case to be caught in said dust collecting chamber; and

magnetic material adhesion preventing means provided in an inlet passage through which air flows due to a rotation of said fan motor, said magnetic material adhesion preventing means acting to prevent adhesion of fine dust composed of magnetic materials included in said air flow to a vicinity of said permanent magnet.

10. A vacuum cleaner according to claim 6, wherein said magnetic material adhesion preventing means is a fine-dust catching filter in the form of a cylinder covering said rotor of said motor and is capable of catching said fine dust composed of magnetic materials.

7. A vacuum cleaner comprising:

a fan motor disposed in a main body case thereof and consisting of a motor arranged in such a manner that its rotor uses a permanent magnet and a fan arranged to be rotated by said motor;

a dust-collecting chamber disposed in a suction side of said fan motor and capable of collecting dust suctioned into said main body case due to a rotation of said fan motor;

a dust-collecting filter for causing said dust suctioned into said main body case to be caught in said dust collecting chamber; and

magnetic material adhesion preventing means including an insulating wall for hermetically insulating said rotor from air flow generated due to rotation of said fan motor provided in an inlet passage through which the air flows due to the rotation of the fan motor, said magnetic material adhesion preventing means acting to prevent adhesion of fine dust composed of magnetic materials included in said air flow to a vicinity of said permanent magnet.

8. A vacuum cleaner according to claim 7, wherein said insulating wall is formed by two cylindrical bodies, one of said two cylindrical bodies is disposed between a housing of said fan motor and a stator, and the other of said two cylindrical bodies is disposed between an end bracket of said fan motor and said stator.

9. A vacuum cleaner according to claim 8, wherein said cylindrical body disposed between said housing of said motor and said stator is formed integrally with said housing and said cylindrical body disposed between said end bracket of said motor and said stator is formed integrally with said end bracket.

11. A vacuum cleaner comprising:

a fan disposed in a main body case of the vacuum cleaner;

a fan motor including a rotor of a permanent magnet for rotatably driving said fan;

a dust-collecting chamber disposed in a suction side of said fan motor and capable of collecting dust suctioned into said main body case due to a rotation of said fan motor;

a dust-collecting filter for causing said dust suctioned into said main body case to be caught in said dust-collecting chamber; and

magnetic material adhesion preventing means provided in an inlet passage through which air flows due to the rotation of said fan motor for preventing adhesion of fine dust composed of magnetic materials included in said air flow to a vicinity of said permanent magnet, said magnetic material adhesion preventing means comprising a fine-dust catching filter capable of catching fine dust composed of magnetic material passing through said dust-collecting filter and an insulating wall capable of insulating said rotor from an air flow generated due to the rotation of said fan motor.

12. A vacuum cleaner comprising:

a fan disposed in a main body case of the vacuum cleaner;

a fan motor for driving said fan and including a rotor or stator of a permanent magnet;

a dust-collecting chamber disposed in a suction side of said fan motor and capable of collecting dust suctioned into said main body case due to a rotation of said fan motor;

a dust-collecting filter for causing said dust suctioned into said main body case to be caught in said dust-collecting chamber; and

magnetic material adhesion preventing means provided in an inlet passage through which air flows due to the rotation of said fan motor and for preventing adhesion of fine dust composed of magnetic materials included in said air flow to a vicinity of said permanent magnet, and wherein said dust-collecting filter serves as said magnetic adhesion preventing means by arranging the same so as to enable a catching of said fine dust composed of said magnetic materials.