Air conditioner
By optimizing the β-angle linear diagram and shape of the axial flow fan blade, adjusting the work area, and setting a sawtooth notch at the trailing edge, the problems of low efficiency and high noise of the axial flow fan are solved, and more efficient airflow and noise reduction are achieved.
Patent Information
- Application Number
- CN202311553614.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-20
- Publication Date
- 2025-05-20
AI Technical Summary
The axial flow fan has problems of low efficiency and high noise during the working process, mainly because the airflow is separated in the middle of the blade.
By optimizing the β-angle linear plot of the leading edge and trailing edge of the blade, the shape of the blade is adjusted so that the work area of the blade moves to the trailing edge side, and a sawtooth notch is provided at the trailing edge to improve airflow.
It improves the working efficiency of the axial flow fan, reduces noise, and effectively avoids the problem of early separation of airflow.
Smart Images
Figure CN120020455A_ABST
Abstract
Claims
1. An air conditioner, characterized in that: include: case; An axial flow fan is arranged in the housing and is used to drive air flow. The axial flow fan comprises: mid-game; A blade is connected to the outer periphery of the middle disk, the blade having a negative pressure surface located on the upstream side of the airflow direction and a positive pressure surface located on the downstream side, and the blade includes: leading and trailing edges; An inner edge connected to the center disk to form an edge of the inner circumference of the blade; an outer edge forming an edge portion of an outer peripheral side of the blade; In the circumferential section of the blade, the angle between an imaginary line perpendicular to the axis of the center disk and intersecting a point on the circumferential section and an imaginary line representing a tangent to the point is defined as angle β; Assuming that the horizontal axis of the leading edge β angle linear graph is the distance in the radial direction from the inner edge to the outer edge, and the vertical axis is the β angle of the leading edge, the relationship between the β angle of the leading edge and the distance in the radial direction from the inner edge to the outer edge is represented as a leading edge β angle linear line; The leading edge β angle linear line increases first, then decreases, and then increases again from the inner edge side to the outer edge side.
2. The air conditioner according to claim 1, characterized in that: In a direction from the inner edge side to the outer edge side, the leading edge of the blade has a shape that first protrudes toward the negative pressure surface direction and then protrudes toward the positive pressure surface direction.
3. The air conditioner according to claim 1, characterized in that: Assuming that the horizontal axis of the trailing edge β angle linear graph is the distance in the radial direction from the inner edge to the outer edge, and the vertical axis is the β angle of the trailing edge, the relationship between the β angle of the trailing edge and the distance in the radial direction from the inner edge to the outer edge is represented as a trailing edge β angle linear line; The trailing edge β angle linear line includes a first region close to the trailing edge side, and a second region connected to the first region and located in the middle. The first region presents a downward trend from the inner edge side to the outer edge side.
4. The air conditioner according to claim 3, characterized in that: The slope of the first region is steeper than that of the second region.
5. The air conditioner according to claim 1, characterized in that: In the circumferential section of the blade, the distance from the trailing edge to any point is defined as Ln, the distance from the trailing edge to the leading edge is defined as L, and Ln / L represents the chord length ratio; Assuming that the horizontal axis of the outer edge β angle linear graph is the chord length ratio, and the vertical axis is the β angle size of the outer edge, the relationship between the β angle size of the outer edge and the chord length ratio is expressed as the outer edge β angle linear line; The outer edge β angle linear line can be divided into a fourth region close to the trailing edge side and a fifth region close to the leading edge side, and the fourth region forms a steeper slope than the fifth region.
6. The air conditioner according to claim 5, characterized in that: The fourth region is further divided into a sixth region close to the trailing edge and a seventh region far from the trailing edge; the slope of the sixth region is not lower than the slope of the seventh region.
7. The air conditioner according to claim 1, characterized in that: A plurality of sawtooth notches are arranged at intervals on the rear edge.
8. The air conditioner according to claim 1, characterized in that: The middle plate includes: An outer ring portion, the outer circumference of which is connected to the blades; The outer ring portion is provided with a notch corresponding to the blade, and the notch is surrounded by a first curve and a second curve, the first curve is parallel to the inner edge of the blade, and the second curve is parallel to the axis of the middle disk.
9. The air conditioner according to claim 1, characterized in that: The thickness of a portion of the front edge close to the inner edge gradually increases in a direction close to the inner edge.
10. An air conditioner, characterized in that: include: case; An axial flow fan is arranged in the housing and is used to drive air flow. The axial flow fan comprises: mid-game; A blade is connected to the outer periphery of the middle disk, the blade having a negative pressure surface located on the upstream side of the airflow direction and a positive pressure surface located on the downstream side, and the blade includes: leading and trailing edges; An inner edge connected to the center disk to form an edge of the inner circumference of the blade; an outer edge forming an edge portion of an outer peripheral side of the blade; A portion of the blade close to the outer edge and close to the trailing edge is warped toward the negative pressure surface; In any circumferential section of the blade, the angle between an imaginary line perpendicular to the axis of the center disk and intersecting a point on the circumferential section and an imaginary line representing a tangent to the point is defined as angle β; Assuming that the horizontal axis of the leading edge β angle linear graph is the distance in the radial direction from the inner edge to the outer edge, and the vertical axis is the β angle of the leading edge, the relationship between the β angle of the leading edge and the distance in the radial direction from the inner edge to the outer edge is represented as a leading edge β angle linear line; The leading edge β angle linear line increases first, then decreases, and then increases again from the inner edge side to the outer edge side.