Air intake grille and fan

Abstract

This invention provides an air intake grille and a fan. The air intake grille includes a plurality of radially distributed ribs (10). Each rib (10) has a radial portion and an extension extending toward the fan blade. The tangent of the extension along a cross section perpendicular to the fan blade axis is inclined relative to a plane defined by the endpoint of the long dimension (11) near the fan blade axis and the axis of the fan blade axis, with the inclination angle A ranging from 1° to 89°. The technical solution of this invention effectively solves the problem in the prior art where the straight line containing the long side of the radial rib cross section passes through the central axis of the fan blade, resulting in a large airflow angle blowing towards the leading edge of the fan blade and the suction surface, thus causing poor sound quality in circulating fans.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, specifically to an air intake grille and a fan. Background Technology

[0002] Currently, such as Figure 1 As shown, the main difference between an air circulator fan and a common electric fan is that the circulator fan's blades (3) have a larger installation angle, and the blades (3) are paired with a relatively long, enclosed air guide tube (2) that almost completely encloses the blades (3) axially. Therefore, the airflow effect of a circulator fan differs from that of a regular fan. With blades of the same size, the circulator fan delivers more concentrated airflow, higher air pressure, and a longer airflow distance, enabling it to quickly circulate air in a room and distribute the temperature evenly in air-conditioned or heated rooms.

[0003] In existing technologies, such as Figure 1 and Figure 2 As shown, the air inlet grille of the circulating fan includes multiple radial ribs 1 and multiple circumferential ribs, with the radial ribs 1 arranged radially. Since the long side 4 of the cross-section of the radial ribs 1 passes through the central axis of the fan blades, the airflow entering from the radial ribs parallel to the airflow direction is forcibly deflected by the grille into oblique axial airflow. This results in a large angle of attack of the airflow blowing towards the leading edge of the fan blades and the suction surface, generating vortices on the pressure surface. This leads to poor sound quality and a noticeable humming sound in the circulating fan. Furthermore, to achieve better circulation, the fan blade speed needs to be increased, thus increasing the noise level. Figure 3 The fan blades rotate counterclockwise. Figure 3 The solid arrow in the image points to the tangent line 5 in the direction of the fan blade's rotation. Summary of the Invention

[0004] The main objective of this invention is to provide an air intake grille and a fan to solve the problem in the prior art where the long side of the radial rib cross-section passes through the central axis of the fan blade, resulting in a large angle of airflow blowing towards the leading edge of the fan blade and the suction surface, which leads to poor sound quality in the circulating fan.

[0005] To achieve the above objectives, the present invention provides an air intake grille comprising: a plurality of radially distributed ribs, each rib having a radial portion and an extension portion extending toward the fan blade, the extension portion having a cross section perpendicular to the fan blade axis, the long-scale tangent of which is inclined relative to a plane defined by the long-scale endpoint near the fan blade axis and the axis of the fan blade axis, and the inclination angle A being in the range of 1° to 89°.

[0006] Furthermore, the tilt angle A is in the range of 5° to 60°.

[0007] Furthermore, the inclination angle A of the tangent at the end of the long-scale blade near the pivot point gradually decreases in the direction away from the blade.

[0008] Furthermore, the long-scale features are either straight or arc-shaped.

[0009] Furthermore, the reinforcing bars are plates of uniform thickness.

[0010] Furthermore, the cross-section of the extension perpendicular to the fan blade axis is airfoil-shaped.

[0011] Furthermore, the ribs extend in a spiral shape.

[0012] Furthermore, the radii have the same tilt angle as the extensions.

[0013] Furthermore, the air intake grille also includes annular ribs that are connected to multiple ribs.

[0014] The present invention also provides a fan, including: an air inlet grille, wherein the air inlet grille is the air inlet grille described above.

[0015] The technical solution of the present invention has the following advantages: the tangent of the extension along the long dimension of the cross section perpendicular to the fan blade axis is inclined relative to the plane determined by the long dimension near the end point of the fan blade axis and the axis of the fan blade axis, and the inclination angle A is in the range of 1° to 89°. This makes the inclination direction face the rotation direction of the fan blade, and the airflow is pre-rotated and deflected through the extension of the rib, thereby enabling the airflow sent into the fan blade to generate a positive deflection in advance, thereby reducing the intake angle, reducing the fan blade shedding vortex, improving the sound quality, and increasing the air delivery distance at the same rotation speed and improving the sound quality at the same torque. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0017] Figure 1 A cross-sectional schematic diagram of a circulating fan in the prior art is shown;

[0018] Figure 2 It shows Figure 1 A schematic diagram of the air intake grille of a circulating fan;

[0019] Figure 3 It shows Figure 2 A simplified schematic diagram showing the cross-section of a rib of the air intake grille and the rotation direction of the fan blades;

[0020] Figure 4 It shows Figure 1A simulation diagram illustrating the air delivery effect of a circulating fan;

[0021] Figure 5 A front view schematic diagram of an embodiment of the air intake grille according to the present invention is shown;

[0022] Figure 6 It shows Figure 5 A cross-sectional schematic diagram of the air intake grille near the fan blades;

[0023] Figure 7 It shows Figure 6 Enlarged schematic diagram of point B of the air intake grille;

[0024] Figure 8 It shows Figure 7 A simplified schematic diagram showing the middle cross-section of the air intake grille and the rotation direction and air intake direction of the fan blades;

[0025] Figure 9 A simplified schematic diagram of the cross-section of a rib of the air intake grille according to a second embodiment of the present invention, and the rotation direction and air intake direction of the fan blades are shown.

[0026] Figure 10 A simplified schematic diagram of the cross-section of a rib of an air intake grille according to a third embodiment of the present invention, and the rotation direction and air intake direction of the fan blades are shown.

[0027] Figure 11 A front view schematic diagram of an embodiment four of the air intake grille according to the present invention is shown;

[0028] Figure 12 A simulation diagram illustrating the air delivery effect of the circulating fan according to the present invention is shown.

[0029] The reference numerals in the above figures are as follows:

[0030] 1. Radial ribs; 2. Air guide tube; 3. Fan blades; 4. Long side; 5. Tangent; 10. Ribs; 11. Long dimension; 20. Tangent; 30. Annular ribs. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figures 5 to 7As shown, the air intake grille of this embodiment includes: a plurality of radially distributed ribs 10, each rib 10 having a radial portion and an extension portion extending toward the fan blade. The extension portion, along a cross-section perpendicular to the fan blade axis, has a tangent of its long dimension 11 inclined relative to a plane defined by the endpoint of the long dimension 11 near the fan blade axis and the axis of the fan blade axis, with an inclination angle A ranging from 1° to 89°. Figure 8 The fan blades rotate counterclockwise. Figure 8 The solid arrow in the image refers to the tangent 20 in the direction of the fan blade's rotation, while the dashed arrow indicates the direction of air intake.

[0034] In the air intake grille of this embodiment, the tangent of the extended portion along the long dimension 11 of the cross section perpendicular to the fan blade axis is inclined relative to the plane defined by the endpoint of the long dimension 11 near the fan blade axis and the axis of the fan blade axis, and the inclination angle A is in the range of 1° to 89°. This makes the inclination direction face the rotation direction of the fan blade, and the airflow is pre-rotated and deflected through the extension of the rib, thereby enabling the airflow sent into the fan blade to generate a positive deflection in advance, thereby reducing the intake angle of attack, reducing the fan blade shedding vortex, improving the sound quality, increasing the air delivery distance at the same rotation speed, and improving the sound quality at the same torque.

[0035] Preferably, the tilt angle A is in the range of 5° to 60°. Within this range, there is a certain pre-rotation effect, which is conducive to demolding and will not deflect excessively.

[0036] In this embodiment, as Figure 7 and Figure 8 As shown, the long dimension 11 is straight, which facilitates processing and reduces manufacturing difficulty. In this embodiment, the rib 10 is a plate of uniform thickness, which facilitates manufacturing and reduces manufacturing costs. Of course, the distance between the two long dimensions can gradually decrease along the direction close to the fan blade axis, that is, the rib is not a plate of uniform thickness.

[0037] In this embodiment, as Figure 5 As shown, the spokes have the same tilt angle as the extension. The airflow is pre-rotated and deflected by the spokes of the ribs, which can reduce the intake angle and reduce the shedding vortex of the fan blades, thus improving the sound quality. Compared with the air intake grilles in the prior art, the above-mentioned air intake grille increases the air delivery distance at the same rotation speed and improves the sound quality at the same torque.

[0038] In this embodiment, the air intake grille also includes annular ribs 30 that are connected to multiple ribs 10. The annular ribs 30 strengthen the air intake grille and prevent it from deforming under external force.

[0039] In this embodiment, the spokes of the rib 10 extend radially along the fan blade axis.

[0040] The air intake grille in the prior art and the air intake grille of Embodiment 1 with an inclination angle within the range of 5° to 60° were tested. The test data are shown in Table 1 below.

[0041] Table 1

[0042]

[0043] As can be seen from Table 1, the air intake grille of Embodiment 1 can increase the airflow by 10.4% while reducing the air intake grille rotation speed by 35 rpm compared to the prior art, and the corresponding noise peak is also reduced.

[0044] Example 2

[0045] Figure 9 The structure of a second embodiment of the air intake grille of the present invention is shown. The difference between the air intake grille of the second embodiment and that of the first embodiment lies in the shape of the long dimension 11. In the second embodiment, the long dimension 11 is arc-shaped.

[0046] Example 3

[0047] Figure 10 The structure of an air intake grille according to a third embodiment of the present invention is shown. The difference between the air intake grille of the third embodiment and that of the first embodiment lies in the shape of its cross-section. In the second embodiment, the cross-section of the extension perpendicular to the fan blade axis is airfoil-shaped.

[0048] Example 4

[0049] Figure 11 The structure of an air intake grille according to Embodiment 4 of the present invention is shown. The difference between the air intake grille of Embodiment 4 and Embodiment 1 lies in the different extension directions of the ribs. In Embodiment 4, the ribs 10 extend in a spiral shape, and the spiral extension direction is consistent with the rotation direction of the fan blades. This reduces the number of ribs while maintaining the grille spacing, thereby increasing the air intake volume. Furthermore, the radius of curvature of the spiral is not limited.

[0050] As an alternative implementation, the inclination angle A of the tangent at the end of the long dimension near the blade axis gradually decreases in the direction away from the blade.

[0051] The present invention also provides a fan, the fan comprising: an air inlet grille, wherein the air inlet grille is as described above. In this embodiment, the fan is a circulating fan. Figure 12 The simulated velocity cloud diagram of the air delivery effect of the circulating fan in this embodiment is shown. Figure 4 This diagram shows a simulated velocity contour plot of the airflow effect of a circulating fan in the prior art. Figure 4 and Figure 12 By comparison, it is clear that the circulating fan in this embodiment can effectively increase the air delivery distance and improve the air volume at the same rotation speed.

[0052] As an alternative implementation, the fan can also be an oscillating fan, a floor fan, a table fan, or other types of fans.

[0053] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0054] The inclined ribs can pre-deflect the airflow into the fan blades, reducing the intake angle, decreasing the shedding vortex of the fan blades, and improving air delivery efficiency. At the same speed, it can increase the air volume passing through the air duct of the circulating fan, thereby increasing the air pressure and achieving a longer air delivery distance. Furthermore, because the shedding vortex is reduced, the sound quality is improved. If the air volume is kept constant, the fan speed can be reduced, thereby improving the sound quality and reducing the noise level.

[0055] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An air intake grille, comprising: Multiple radially distributed ribs (10), each rib (10) having radial portions and extensions extending toward the fan blade, characterized in that the tangent of the extension along a cross section perpendicular to the fan blade axis is inclined relative to a plane defined by the endpoint of the long dimension (11) near the fan blade axis and the axis of the fan blade axis, with the inclination angle A ranging from 1° to 89°. The inclination angle A of the tangent at the end of the long dimension (11) near the end of the fan blade axis gradually decreases in the direction away from the fan blade.

2. The air intake grille according to claim 1, characterized in that, The tilt angle A is in the range of 5° to 60°.

3. The air intake grille according to claim 1, characterized in that, The long dimension (11) is either straight or arc-shaped.

4. The air intake grille according to claim 3, characterized in that, The reinforcing bar (10) is a plate of equal thickness.

5. The air intake grille according to claim 1, characterized in that, The cross-section of the extension perpendicular to the fan blade axis is airfoil-shaped.

6. The air intake grille according to claim 1, characterized in that, The ribs (10) extend in a spiral shape.

7. The air intake grille according to claim 1, characterized in that, The radial portion has the same tilt angle as the extension portion.

8. The air intake grille according to any one of claims 1 to 7, characterized in that, The air intake grille also includes annular ribs (30) that are connected to the plurality of ribs (10).

9. A fan, comprising: An air intake grille, characterized in that the air intake grille is the air intake grille according to any one of claims 1 to 8.

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