Electric work machine
AssigneeMakita Corporation
InventorSho ENOMOTO
Life of this patent
Estimating the term…
Abstract
A centrifugal fan for an electric work machine (1) includes a wall part (136), which radially surrounds a fan main body (5) that includes a blade unit (55) having radially-extending blades (56) on one surface of a disc (51). The wall part is defines a flow path, between an outer-circumferential edge (D1) of the blade unit and an inner surface of the wall part, that directs, in a first direction that is parallel to the first axis, air delivered radially outward from (by) the plurality of blades. The inner diameter (D2) of the blade unit is 45%-60% of the outer diameter (D1) of the blade unit. The outer diameter (D3) of the disc is 80%-95% of the outer diameter of the blade unit. The inner diameter (D4) of the wall part is 110%-120% of the outer diameter of the blade unit.
Claims16
A centrifugal fan for an electric work machine, comprising:
- a fan main body;
- and
- a wall part, which radially surrounds the fan main body;
- wherein:
- the fan main body comprises:
- a disc centered about a first axis;
- and
- a blade unit, which comprises a plurality of blades arranged on one surface of the disc, each blade extending radially outward from a central portion of the blade unit to beyond an outer-circumferential edge of the disc;
- the wall part is configured to define a flow path, between an outer-circumferential edge of the blade unit and an inner surface of the wall part, that directs, in a first direction that is parallel to the first axis, air delivered radially outward from the plurality of blades;
- the inner diameter of the blade unit is in the range of 45%-60% of the outer diameter of the blade unit;
- the outer diameter of the disc is in the range of 80%-95% of the outer diameter of the blade unit;
- and
- the inner diameter of the wall part is in the range of 110%-120% of the outer diameter of the blade unit.
An electric work machine, comprising:
- a housing, which has at least one air-intake port and at least one air-exhaust port;
- a motor, which is disposed inside the housing;
- a centrifugal fan, which is disposed inside the housing and is configured to generate a flow of air from the air-intake port(s) to the air-exhaust port(s) inside the housing when rotated by the motor around a first axis;
- and
- a wall part, which is radially surrounds the centrifugal fan;
- wherein:
- the centrifugal fan comprises:
- a disc centered about the first axis;
- and
- a blade unit, which comprises a plurality of blades arranged on one surface of the disc, each blade extending radially outward from a central portion of the blade unit to beyond an outer-circumferential edge of the disc;
- the wall part is configured to define a flow path, between an outer-circumferential edge of the plurality of blades and an inner surface of the wall part, that directs, in a first direction that is parallel to the first axis, air delivered radially outward from the plurality of blades;
- the inner diameter of the blade unit is in the range of 45%-60% of the outer diameter of the blade unit;
- the outer diameter of the disc is in the range of 80%-95% of the outer diameter of the blade unit;
- and
- the inner diameter of the wall part is in the range of 110%-120% of the outer diameter of the blade unit.
Dependencies are inferred from the claim text.