Cooling apparatus for motor means to protect commutator from dust and moisture in cooling air

Claim 2

In a motor means for use in a blower apparatus having said motor means, a fan means adapted to be driven by said motor means and a casing encasing said fan means, said motor means including a housing, a permanent magnet means formed substantially in an annular form on an inner surface of said housing, a shaft projected outwardly from one end surface of said housing and rotatably supported at both ends of said housing, said fan means being fixed to the projected end portion of said shaft, an armature mounted on a portion of said shaft disposed in opposition to said permanent magnet means, a commutator mounted on the portion of said shaft opposite to said projected end portion of said shaft and located adjacent to said armature, and a brush means electrically engaging with said commutator, a cooling apparatus for cooling said motor means comprising: an air introduction opening formed in a wall portion of said housing radially opposing said commutator; means for guiding a cooling air flow from said air introduction opening such that the cooling air flows along said armature into a low-pressure space in said blower apparatus, the pressure in said low-pressure space being lowered as a result of a rotation of said fan means to a level of the pressure around said air introduction opening, and deflecting means provided on a stationary part of the motor means at an upstream side of said armature as viewed in the direction of flow of said cooling air, for deflecting the cooling air from the guiding means away from the commutator and toward said armature so as to prevent a direct contact of dust and moisture in the cooling air with the commutator.

Claim 3

A cooling apparatus according to claim 1, wherein said means for guiding includes a rubber hose closely fitting said air introduction opening and providing a communication between on interior of said casing and an interior of said housing, said deflecting means includes a deflecting surface formed on an inner surface of an end portion of said rubber hose and a projection formed on said inner surface of said rubber hose in opposition to said deflecting surface.

Claim 4

A cooling apparatus according to claim 2, wherein said brush means is attached to a brush base plate disposed between said armature and the end surface of said housing opposite to the projected end portion of said shaft.

Claim 5

A cooling apparatus according to claim 1, wherein said deflecting means includes a porous plate plug closing said air introduction opening and a tongue-like projection formed on the surface of said plug in opposition to said commutator.

Claim 6

A cooling apparatus according to claim 1, wherein said means for guiding include a rubber hose closely fitting said air introduction opening and providing a communication between the space in said casing and the space in said housing, said deflecting means including a tongue-like projection integrally attached to an end surface of said rubber hose.

Claim 7

A cooling apparatus according to claim 1, wherein means are provided for fitting said deflecting means in said air introduction opening formed in the wall portion of said housing.

Claim 8

A cooling apparatus according to claim 1, wherein said deflecting means is made of an elastic material, and means are provided for fitting said deflecting means on said air introduction opening formed in the wall portion of said housing.

Claim 9

In a motor means for use in a blower apparatus having said motor means, a fan means adapted to be driven by said motor means and a casing encasing said fan means, said motor means including a housing, a permanent magnet means formed substantially in an annular form on an inner surface of said housing, a shaft projected outwardly from one end surface of said housing and rotatably supported at both ends of said housing, said fan means being fixed to the outwardly projected shaft, an armature mounted on a portion of said shaft disposed in opposition to said permanent magnet means, a commutator mounted on the portion of said shaft opposite to said outwardly projected shaft and located adjacent to said armature, and a brush means electrically engaging with said commutator, a cooling apparatus for cooling said motor means comprising: an air introduction opening formed in a wall portion of said housing radially opposing said commutator; means for guiding a cooling air flow from said air introduction opening such that the cooling air flows along said armature into a low pressure space in said blower apparatus, the pressure in said low pressure space being lowered as a result of a rotation of the fan means to a level of the pressure around said air introduction opening, said means for guiding including a hose fitting said air introduction opening and providing a communication between the interior of said casing and the interior of said housing, and wherein deflecting means are provided on a stationary part of the motor means at an upstream side of said armature as viewed in a direction of flow of said cooling air for deflecting the cooling air from the guiding means away from the commutator and toward said armature so as to prevent a direct contact of dust and moisture in the cooling air with the commutator, said deflecting means including a deflecting surface formed on an inner surface of an end portion of said hose and a projection formed on an inner surface of said hose in opposition to said deflecting surface.

Claim 10

In a motor means for use in a blower apparatus having said motor means, a fan means adapted to be driven by said motor means and a casing encasing said fan means, said motor means including a housing, a permanent magnet means formed substantially in an annular form on an inner surface of said housing, a shaft projected outwardly from one end surface of said housing and rotatably supported at both ends of said housing, said fan means being fixed to the outwardly projected shaft, an armature mounted on a portion of said shaft disposed in opposition to said permanent magnet means, a commutator mounted on the portion of said shaft opposite to said outwardly projected shaft and located adjacent to said armature, and a brush means electrically engaging with said commutator, a cooling apparatus for cooling said motor means comprising: an air introduction opening formed in a wall portion of said housing radially opposing said commutator; means for guiding a cooling air flow from said air introduction opening such that the cooling air flows along said armature into a low pressure space in said blower apparatus, the pressure in said low pressure space being lowered as a result of a rotation of the fan means to a level of the pressure around said air introduction opening, said means for guiding including a hose fitting said air introduction opening and providing a communication between the interior of said casing and the interior of said housing, and wherein deflecting means are provided on a stationary part of the motor means at an upstream side of said armature as viewed in a direction of flow of said cooling air for deflecting the cooling air from the guiding means away from the commutator and toward said armature so as to prevent a direct contact of dust and moisture in the cooling air with the commutator, said deflecting means including a deflecting surface formed on an inner surface of an end portion of said hose and a projection formed on an inner surface of said hose in opposition to said deflecting surface.

Claim 11

A cooling apparatus according to claim 8, wherein said deflecting means includes a porous plate plug closing said air introduction opening and a tongue-like projection of formed on a surface of said plug in opposition to said commutator.