Fan accessory and fan assembly
A fan accessory includes an air-inlet piece configured to be disposed in front of a fan and has a first hole adjacent to an outside and a second hole adjacent to the fan. The first hole is in communication with the second hole. The first hole has a first diameter gradually decreased in an airflow direction from the outside to the fan, and the second hole has a second diameter gradually increased in the airflow direction. The fan accessory also includes an air-outlet piece configured to be disposed behind the fan and have a third hole. The third hole has a third diameter gradually decreased in the airflow direction.
1 . A fan accessory comprising:
an air-inlet piece configured to be disposed in front of a fan and comprising a first hole adjacent to an outside and a second hole adjacent to the fan, wherein the first hole is in communication with the second hole, the first hole has a first diameter gradually decreased in an airflow direction from the outside to the fan, and the second hole has a second diameter gradually increased in the airflow direction; and
an air-outlet piece configured to be disposed behind the fan and comprising a third hole, wherein the third hole has a third diameter gradually decreased in the airflow direction,
wherein the air-inlet piece further comprises a fourth hole disposed between and in communication with the first hole and the second hole, wherein a diameter of the fourth hole is a constant.
2 . The fan accessory of claim 1 , wherein the first hole has a largest diameter greater than a largest diameter of the second hole.
3 . The fan accessory of claim 2 , wherein the first hole has a smallest diameter equal to a smallest diameter of the second hole and equal to the diameter of the fourth hole.
4 . The fan accessory of claim 1 , wherein the air-outlet piece further comprises a fifth hole in communication with the third hole, wherein a diameter of the fifth hole is a constant.
5 . The fan accessory of claim 4 , wherein the third hole has a smallest diameter equal to the diameter of the fifth hole.
6 . The fan accessory of claim 1 , wherein the first hole has a depth greater than a depth of the second hole.
7 . The fan accessory of claim 1 , wherein the first hole has a depth greater than a depth of the second hole, and the depth of the second hole is greater than a depth of the fourth hole.
8 . The fan accessory of claim 4 , wherein the third hole has a depth greater than a depth of the fifth hole.
9 . The fan accessory of claim 1 , wherein a surface of the first hole, a surface of the second hole, and a surface of the third hold are flat.
10 . A fan assembly comprising:
a fan;
an air-inlet piece configured to be disposed in front of the fan and comprising a first hole adjacent to an outside and a second hole adjacent to the fan, wherein the first hole is in communication with the second hole, the first hole has a first diameter gradually decreased in an airflow direction from the outside to the fan, and the second hole has a second diameter gradually increased in the airflow direction; and
an air-outlet piece configured to be disposed behind the fan and comprising a third hole, wherein the third hole has a third diameter gradually decreased in the airflow direction,
wherein the air-outlet piece further comprises a fifth hole in communication with the third hole, wherein a diameter of the fifth hole is a constant.
11 . The fan assembly of claim 10 , wherein the air-inlet piece further comprises a fourth hole disposed between and in communication with the first hole and the second hole, wherein a diameter of the fourth hole is a constant.
12 . The fan assembly of claim 11 , wherein the first hole has a largest diameter greater than a largest diameter of the second hole.
13 . The fan assembly of claim 12 , wherein the first hole has a smallest diameter equal to a smallest diameter of the second hole and equal to the diameter of the fourth hole.
14 . The fan assembly of claim 10 , wherein the third hole has a smallest diameter equal to the diameter of the fifth hole.
15 . The fan assembly of claim 10 , wherein the first hole has a depth greater than a depth of the second hole.
16 . The fan assembly of claim 11 , wherein the first hole has a depth greater than a depth of the second hole, and the depth of the second hole is greater than a depth of the fourth hole.
17 . The fan assembly of claim 10 , wherein the third hole has a depth greater than a depth of the fifth hole.
18 . A fan assembly comprising
a fan;
an air-inlet piece configured to be disposed in front of the fan and comprising a first hole adjacent to an outside and a second hole adjacent to the fan, wherein the first hole is in communication with the second hole, the first hole has a first diameter gradually decreased in an airflow direction from the outside to the fan, and the second hole has a second diameter gradually increased in the airflow direction;
an air-outlet piece configured to be disposed behind the fan and comprising a third hole, wherein the third hole has a third diameter gradually decreased in the airflow direction; and
a fastener configured to fasten the air-inlet piece and the air-outlet piece to the fan,
wherein the first hole has a depth greater than a depth of the second hole.