Blower

Patent metadata

Field	Value
Publication number	US-11959488-B2
Application number	US-202017783091-A
Country	US
Kind code	B2
Filing date	Dec 8, 2020
Priority date	Dec 9, 2019
Publication date	Apr 16, 2024
Grant date	Apr 16, 2024

Abstract

The present invention relates to a blower, the blower according to an embodiment of the present invention comprising: a lower case having a suction hole formed therein through which air is introduced; an upper case arranged on the upper side of the lower case and having a discharge hole formed therein through which air is discharged; and a fan arranged in the lower case and including a plurality of blades. Each of the plurality of blades includes a plurality of airfoils respectively extending along different camber lines from one another, and a leading edge of connecting the leading ends of the plurality of airfoils. Entrance angles formed by the respective camber lines of the plurality of airfoils and the rotation directions of the blades are different from one another. Thus, due to the curved shape of the leading edge and the design of a recessed notch, a flow separating from the leading edge is reduced, and thus, there is an advantage in that air volume performance is improved.

First claim

The invention claimed is:

1. A blower, comprising:
a lower case in which at least one suction hole through which air flows inside is formed;
an upper case that is disposed on the lower case and in which at least one discharge hole through which air is discharged is formed; and
a fan that is disposed in the lower case and comprises a hub coupled to a motor, a shroud spaced apart below from the hub, and a plurality of blades that connects the hub and the shroud, wherein each of the plurality of blades includes:
a tip portion connected to the shroud;
a root portion connected to the hub;
a trailing edge defined as a rear end with respect to a rotational direction;
a leading edge that faces the trailing edge, defined as a front end with respect to the rotational direction, curved toward the trailing edge such that a maximum curved point is formed where a distance between the leading edge and the trailing edge becomes minimal;
a first reference airfoil defined as a surface parallel to the tip portion and the root portion, and located downstream of the leading edge with respect to the maximum curved point;
a second reference airfoil defined as a surface parallel to the tip portion and the root portion, and located upstream of the leading edge with respect to the maximum curved point, wherein a first inlet angle defined as a contained angle between a trace of the leading edge and a tangential line of the first reference airfoil at an intersection point of the leading edge and the first reference airfoil is smaller than a second inlet angle defined as a contained angle between a trace of the leading edge and a tangential line of the second reference airfoil at an intersection point of the leading edge and the second reference airfoil.

2. The blower of claim 1 , wherein an inlet angle is continuously variable along the leading edge.

3. The blower of claim 1 , wherein each of the plurality of blades further includes at least one notch recessed in a direction crossing the leading edge from the leading edge.

4. The airfoil of claim 1 , wherein the fan has a vertical rotational axis and discharges air in a direction oblique to the vertical rotational axis.

5. The blower of claim 1 , wherein the first reference airfoil is disposed above the second reference airfoil so as to be closer to a rotational axis.

6. The blower of claim 1 , wherein a ratio of a distance from the first reference airfoil to the root portion and to the tip portion is 1:2, and wherein a ratio of a distance from the second reference airfoil to the root portion and to the tip portion is 2:1.

7. The blower of claim 6 , wherein the first inlet angle is 23.5° or more and 25° or less, and the second inlet angle is 29° or more and 30.5° or less.

8. The blower of claim 1 , wherein the first reference airfoil is closer to an air inlet of the shroud than the second reference airfoil.

9. A blower, comprising:
a lower case in which at least one suction hole through which air flows inside is formed;
an upper case that is disposed in the lower case and in which at least one discharge hole through which air is discharged is formed; and
a fan that is disposed in the lower case and comprising a plurality of blades that rotates about a vertical rotational axis, wherein each of the plurality of blades includes:
a leading edge defined as a front end with respect to a rotational direction;
a trailing edge facing the leading edge, and defined as a rear end with respect to the rotational direction;
a pressure surface that connects the leading edge and the trailing edge, and defined as an upstream surface with respect to an airflow direction;
a negative pressure surface that connects the leading edge and the trailing edge, and defined as a downstream surface with respect to the airflow direction; and
at least one notch recessed toward the pressure surface from the leading edge and the negative pressure surface, and wherein the at least one notch includes:
a bottom line formed as a deepest recessed portion of the at least one notch, having a line shape, and extending in a circumferential direction about the vertical rotational axis;
a first inclined surface that extends obliquely from a first side of the bottom line so as to connect the bottom line with the leading edge and the negative pressure surface; and

a second inclined surface facing the first inclined surface, extending obliquely from a second side of the bottom line so as to connect the bottom line with the leading edge and the negative pressure surface, wherein the first inclined surface and the second inclined surface are connected by the bottom line.

10. The blower of claim 9 , wherein the at least one notch extends in the circumferential direction with respect to the vertical rotational axis of the fan.

11. The blower of claim 9 , wherein the fan includes:
a hub into which a motor shaft of a fan motor is inserted and that is connected with each of the blade: and
a shroud that is disposed to be spaced apart from the hub,
wherein the pressure surface faces the hub, and the negative pressure surface faces the shroud.

12. The blower of claim 11 , wherein the at least one notch is formed such that a width thereof becomes narrower as the at least one notch extends toward the pressure surface.

13. The blower of claim 11 , wherein as the at least one notch comprises a plurality of notches formed at positions spaced apart from the hub, such that a length from the trailing edge increases.

14. The blower of claim 11 , wherein the at least one notch comprises a plurality of notches, and wherein a number of notches formed closer to the shroud than the hub is larger than a number of notches formed closer to the hub than the shroud.

15. The blower of claim 9 , wherein as the at least one notch extends away from the leading edge, a recessed depth thereof decreases.

16. The blower of claim 9 , wherein the at least one notch is formed such that a length extending toward the trailing edge is larger than a recessed depth thereof.

17. The blower of claim 9 , wherein a corner is formed at a position of the at least one notch which is spaced apart from the bottom line.

18. The blower of claim 9 , wherein the bottom line has a slope of degree with respect to a horizontal surface perpendicular to the vertical rotational axis.

19. The blower of claim 18 , wherein the slope of degree of the bottom line is 0 to 10.

Assignees

• Lg Electronics Inc

Inventors

• Jung Jaehyuk
• Choi Seokho
• Lee Changhoon
• Kim Juhyun
• Park Hyungho
• Kim Hoojin
• Kim Yongmin
• CHOI Chiyoung

Classifications

• F04D29/281 Primary

  for fans or blowers · CPC title

• F04D25/06

  the pump being electrically driven (F04D25/08 takes precedence) · CPC title

• F04D25/08 Primary

  the working fluid being air, e.g. for ventilation · CPC title

• F04D29/053

  Shafts · CPC title

• F04D29/326

  comprising a rotating shroud · CPC title