Dust extractor
A dust extractor ( 1 ) includes a motor ( 30 ) and a blower fan ( 40 ), which is disposed downward of the motor and is connected to the motor. The dust extractor further includes a flexible (pliable) support member ( 50; 500 ), which has a lower-end portion ( 52 ) connected to the motor and suspends the motor.
1. A motor assembly comprising:
a motor;
a blower fan disposed downward of the motor and connected to the motor;
a flexible support member having a lower-end portion connected to the motor, the flexible support member suspending the motor; and
a motor case supporting an upper-end portion of the flexible support member;
wherein:
the motor case comprises a lower case connected to an upper case; and
the upper-end portion of the flexible support member is interposed between the upper case and the lower case at a connection location of the upper case and lower case.
2. The motor assembly according to claim 1 , wherein:
the flexible support member is made of rubber; and
the flexible support member has a Shore durometer A of 80 or less.
3. The motor assembly according to claim 2 , wherein the flexible support member has a Shore durometer A of 55 or more.
4. The motor assembly according to claim 1 , wherein the motor is disposed such that a rotational axis of the motor extends in an up-down direction.
5. The motor assembly according to claim 4 , wherein the flexible support member includes a portion that is inclined upward as it goes outward in the radial direction of the rotational axis.
6. The motor assembly according to claim 4 , wherein the flexible support member comprises a membrane portion disposed around the rotational axis and having a ring shape in transverse cross-section.
7. The motor assembly according to claim 6 , wherein the membrane portion has a thickness in a range of 1-3 millimeters.
8. The motor assembly according to claim 6 , wherein the membrane portion has a tensile strength of at least 3.0 MPa.
9. The motor assembly according to claim 6 , wherein the membrane portion has an elongation at break of at least 150%.
10. The motor assembly according to claim 6 , wherein:
the motor comprises a rotor shaft connected to the blower fan; and
the membrane portion has an opening, in which the rotor shaft is disposed.
11. The motor assembly according to claim 1 , wherein:
the motor comprises a motor main body and a motor housing, which is disposed around the motor main body; and
the flexible support member suspends the motor housing.
12. The motor assembly according to claim 11 , further comprising:
a base member connected to the motor housing;
wherein the lower-end portion of the flexible support member is interposed between the motor housing and the base member.
13. The motor assembly according to claim 12 , further comprising:
a fan cover disposed around the blower fan and fixed to the base member;
wherein the flexible support member suspends the motor, the base member, the blower fan, and the fan cover.
14. The motor assembly according to claim 1 , wherein an intermediate portion of the flexible support member between the upper-end portion and the lower-end portion of the flexible support member is spaced apart from the motor and from the motor case.
15. The motor assembly according to claim 14 , wherein the motor case houses the motor, the support member, and the blower fan.
16. The motor assembly according to claim 1 , wherein:
the upper case has an upper opening, which is disposed upward of the support member;
an upper-end portion of the motor is disposed in the upper opening; and
a first seal seals a boundary between the motor and the upper case.
17. The motor assembly according to claim 16 , wherein:
the lower case has a lower opening, which is disposed downward of the blower fan; and
a second seal contacts the lower case and has a passageway, which is fluidly connected with the lower opening.
18. The motor assembly according to claim 17 , further comprising:
a motor housing that houses the motor case;
a base member connected to the motor housing; and
a fan cover disposed around the blower fan and fixed to the base member;
wherein:
the lower-end portion of the flexible support member is interposed between the motor housing and the base member;
the flexible support member suspends the motor, the motor case, the motor housing, the base member, the blower fan, and the fan cover;
the intermediate portion comprises a water-impermeable, truncated cone-shaped membrane portion made of an elastomer having a Shore durometer A in a range of 55-80, a tensile strength of at least 3.0 MPa and an elongation at break of at least 150%;
the membrane portion has a thickness in a range of 1-3 millimeters;
the motor is disposed such that a rotational axis of a rotor shaft of the motor extends in an up-down direction; and
the membrane portion has through hole, in which the rotor shaft is disposed.
19. A dust extractor comprising:
a housing having a suction port;
a tank disposed in the housing; and
the motor assembly according to claim 1 disposed in the housing in a fluid communication path between the suction port and the tank.
20. The dust extractor according to claim 19 , wherein:
the flexible support member is made of rubber and has a Shore durometer A of 80 or less; and
the flexible support member comprises a membrane portion disposed around a rotational axis of a rotor shaft of the motor and having a ring shape in transverse cross-section.