Blower

1. A blower configured to be held or worn in a predetermined posture by a user, the blower comprising:

a volute case defining a suction port, a volute chamber, and a discharge port;

an impeller rotatably supported within the volute chamber;

a motor connected to the impeller and configured to drive the impeller;

at least one battery pack configured to supply electric power to the motor;

a motor controller configured to control the electric power to be supplied to the motor;

an outer case accommodating the suction port of the volute case and the motor and configured to be detachably attached to the at least one battery pack,

wherein

the outer case comprises an external suction port and defines an air passage extending from the external suction port to the suction port of the volute case,

the external suction port is located in the outer case such that the external suction port is directed to be open vertically downward when the blower is held or worn in the predetermined posture by the user,

the air passage is configured such that at least a part of the air passage extends along the at least one battery pack or at least a part of the motor controller is exposed to the air passage, and

an amount of air passing through the external suction port of the outer case that is directed to be open vertically downward is not less than 95 percent of an amount of air passing through the suction port of the volute case when the blower is held or worn in the predetermined posture by the user and the motor drives the impeller.

2. The blower according to claim 1 , wherein

the suction port of the volute case is directed to be open horizontally when the blower is held or worn in the predetermined posture.

3. The blower according to claim 2 , wherein

the outer case comprises a bottom portion facing a ground when the blower is in the predetermined posture, and

the external suction port is located at the bottom portion of the outer case.

4. The blower according to claim 3 , wherein

the bottom portion of the outer case comprises a ground contact face configured to contact the ground when the user places the blower on the ground, and

at least a part of the external suction port is located at a position different from the ground contact face.

5. The blower according to claim 1 , wherein

the outer case comprises a bottom portion facing a ground when the blower is held or worn in the predetermined posture, and

the external suction port is located at the bottom portion of the outer case.

6. The blower according to claim 5 , wherein

the bottom portion of the outer case comprises a ground contact face configured to contact the ground when the user places the blower on the ground, and

at least a part of the external suction port is located at a position different from the ground contact face.

7. The blower according to claim 1 , wherein the at least a part of the air passage extends along the at least one battery pack.

8. The blower according to claim 1 , wherein

the external suction port comprises a first external suction port and a second external suction port,

the air passage comprises a first air passage extending from the first external suction port and a second air passage extending from the second external suction port, and

the at least one battery pack is located between the first air passage and the second air passage.

9. The blower according to claim 1 , wherein the at least a part of the motor controller is exposed to the air passage.

10. The blower according to claim 1 , wherein

the blower is a backpack blower configured to be worn in the predetermined posture on a back of the user.

11. The blower according to claim 10 , wherein

when the blower is worn in the predetermined posture by the user, the motor is located between the user and the volute case and the suction port of the volute case is open rearward away from the user.

12. The blower according to claim 1 , wherein

the external suction port comprises a first external suction port and a second external suction port,

the air passage comprises a first air passage extending from the first external suction port and a second air passage extending from the second external suction port,

the blower further comprises at least one battery pack located between the first air passage and the second air passage, and

each of the first air passage and the second air passage at least partly extends along the at least one battery pack.

13. The blower according to claim 12 , wherein

the at least one battery pack comprises a first battery pack and a second battery pack,

the first air passage at least partly extends along the first battery pack, and

the second air passage at least partly extends along the second battery pack.

14. The blower according to claim 13 , further comprising:

a motor controller configured to control electric power to be supplied to the motor,

wherein at least a part of the motor controller is exposed to the air passage.

15. A backpack blower configured to be worn in a predetermined posture on a back of a user, the backpack blower comprising:

a volute case defining a suction port, a volute chamber, and a discharge port;

an impeller rotatably supported within the volute chamber;

a motor connected to the impeller and configured to drive the impeller; and

an outer case accommodating the suction port of the volute case and the motor,

wherein

the outer case comprises two external suction ports and defines an air passage extending from each of the external suction ports to the suction port of the volute case,

the two external suction ports are located on opposite sides of the outer case in a left-right direction when the blower is held or worn in the predetermined posture by the user,

the two external suction ports are located in the outer case such that the two external suction ports are directed to be open vertically downward when the backpack blower is worn in the predetermined posture on the back of the user, and

an amount of air passing through the two external suction ports of the outer case that is directed to be open vertically downward is not less than 95 percent of an amount of air passing through the suction port of the volute case when the blower is held or worn in the predetermined posture by the user and the motor drives the impeller.

16. The backpack blower according to claim 15 , wherein the suction port of the volute case is directed to be open horizontally when the backpack blower is worn in the predetermined posture on the back of the user.

17. The backpack blower according to claim 16 , wherein

the outer case comprises a bottom portion facing a ground when the backpack blower is worn in the predetermined posture on the back of the user, and

the two external suction ports are located at the bottom portion of the outer case.