Air supply structure of fan and fan

Abstract

The present invention provides a fan air supply structure and a fan, the air supply structure including a centrifugal fan, the centrifugal fan including a housing having an air outlet, an air outlet duct corresponding to the air outlet, a diverter plate disposed within the air outlet duct, the diverter plate separating the air outlet duct into a first air duct near the outside of the housing and a second air duct near the inside of the housing, thereby achieving diverted air supply. Based on the technical solution of the present invention, the diverter plate diverts the airflow into each air duct, making the air volume and wind speed after diversion more uniform; at the same time, the diverter plate has a certain blocking effect on the airflow, reducing the wind speed after the airflow enters the air duct, reducing the impact of the airflow on the subsequent air outlet grille and diverter structure, and thus reducing the cavity noise of the bladeless fan.

Description

Technical Field

[0001] The present invention relates to the technical field of bladeless fans, and in particular to an air supply structure of a fan and the fan. Background Art

[0002] With the improvement of living standards, people's demand for fan functions and performance diversity has also increased, and fans that bring a comfortable experience are more popular. Bladeless fans are widely recognized by consumers for their safety, cleanliness, and aesthetics. However, the narrow slit air outlet used by bladeless fans makes the wind resistance from the centrifugal fan outlet to the air outlet relatively large. Currently, the air supply requirements of centrifugal fans are mainly met by matching them with high-speed motors. However, when running at high speeds, the overall noise of bladeless fans is relatively high, affecting the user experience. In addition, in order to achieve uniform air supply, bladeless fans are equipped with more guide components in the air duct, and the structure is relatively complex.

[0003] Therefore, it is necessary to propose an air supply structure that can reduce working noise while achieving the functions of air diversion and guidance. Summary of the Invention

[0004] In order to solve the problem of high noise caused by the use of high-speed motors to solve the wind resistance problem in the fan in the prior art, the present application proposes a fan air supply structure and a fan, which improves the air supply effect from the air supply structure to replace the high-speed motor.

[0005] In a first aspect, the present invention proposes an air supply structure of a fan, including a centrifugal fan, wherein the centrifugal fan includes a shell having an air outlet, an air outlet duct corresponding to the air outlet inside the shell, and a diverter plate is provided inside the air outlet duct, and the diverter plate divides the air outlet duct into a first air duct close to the outside of the shell and a second air duct close to the inside of the shell to achieve diverted air supply.

[0006] In one embodiment, the outer shell includes a volute and an air-guiding structure connected to the volute, and the end of the air-guiding structure corresponds to the air outlet; the air outlet flow channel includes an arc segment located in the volute and a straight segment located in the air-guiding structure, and the shape of the arc segment matches the shape of the volute at the corresponding position.

[0007] In one embodiment, the diverter plate includes an arc segment and a straight segment. The arc segment is located within the arc segment, and their extension paths match each other. The straight segment is located within the straight segment. In this embodiment, the shape of the diverter plate's path along its length matches the shape of the outlet flow channel along its extension direction, preventing the diverter plate from excessively obstructing the airflow and ensuring smooth and continuous airflow.

[0008] In one embodiment, there is a connection point between the straight plate segment and the arc plate segment. There is an inclination angle β between the plane where the straight plate segment is located and the tangent line of the arc plate segment at the connection point, where 8° < β < 15°, so that the width of the first air duct gradually increases at the straight line segment, and the width of the second air duct gradually decreases at the straight line segment. Through this embodiment, the inclined straight plate segment causes the direction of the air flow output from the second air duct to have a certain deflection, that is, it is not along the tangent direction of the volute, but偏向于 the center side of the volute, which is beneficial to the flow of the air flow in the subsequent flow channels.

[0009] In one embodiment, there is an included angle θ between the two connection lines where the two ends of the arc plate segment are respectively connected to the corresponding center points of the impeller center in the volute, where 60° < θ < 90°. Through this embodiment, the arc plate segment will not prematurely guide the air flow, resulting in most of the air flow entering the second air duct, providing enough space for the divergence process of the air flow, and ensuring that the air flow can evenly enter the first air duct and the second air duct under the action of the flow splitting plate.

[0010] In one embodiment, the width of the end of the first air duct far from the air outlet is b, and the width of the end of the air outlet flow channel far from the air outlet is c, where 0.3c < b < 0.5c. Through this embodiment, the width of its air inlet end is set, that is, the widths of the air inlet ends of the first air duct and the second air duct are allocated, ensuring that the widths of the two can achieve the even distribution of the air flow.

[0011] In one embodiment, the vertical distance between the end of the flow splitting plate close to the air outlet and the air outlet cross-section is f, and the width of the air outlet cross-section in the direction perpendicular to the width direction of the flow splitting plate is e, where 0 < f < 0.3e. Through this embodiment, such a setting makes the first flow channel and the second flow channel have an intersection point at the air outlet. If there is still a problem of uneven air volume in the air flows in the first flow channel and the second flow channel, then under the action of the natural diffusion of the air flow, the first flow channel and the second flow channel can further average the air flow at the intersection point, making the air volume and air speed distribution in each air duct more uniform.

[0012] In one embodiment, it further includes an air outlet cavity connecting the outer shell and communicating with the air outlet, and the air outlet cavity has at least one air outlet slit extending in one direction.

[0013] In one embodiment, the air outlet slit extends along the direction of the air flow output through the air outlet. The air outlet slit includes a first air outlet portion away from the air outlet and a second air outlet portion close to the air outlet. The first air outlet portion corresponds to the first air duct, and the second air outlet portion corresponds to the second air duct. Through this embodiment, the air flows in the first air duct and the second air duct are respectively guided to the first air outlet portion and the second air outlet portion, which is beneficial to ensuring the coherence of the air flow.

[0014] In one embodiment, the extension path of the volute casing matches an Archimedean spiral and has an extension starting point and an extension ending point. The opening corresponding to the air outlet is between the extension starting point and the extension ending point;

[0015] The space between the volute casing and the impeller inside it has a throat with the smallest width. The throat is located between the extension starting point and the extension ending point and is close to the extension starting point. Through this embodiment, the distance between the volute and the impeller gradually decreases from the extension starting point and reaches the minimum at the throat; then the distance between the volute and the impeller gradually increases from the throat in the direction of the extension ending point. Such a setting can improve the air pressure in the volute, overcome the air resistance in the air duct of the air supply device, and thus improve the working efficiency of the centrifugal fan.

[0016] In one embodiment, the width of the throat is h, the outer diameter of the impeller is D, 0.05D < h < 0.1D, and h > 3 mm.

[0017] In one embodiment, the air guiding structure includes an air guiding back plate and a volute tongue. One end of the volute tongue is connected to the extension starting point, and one end of the air guiding back plate is connected to the extension ending point.

[0018] In a second aspect, the present invention provides a fan, which includes the above-mentioned air supply structure.

[0019] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the object of the present invention can be achieved.

[0020] The air supply structure of a fan and the fan provided by the present invention have at least the following beneficial effects compared with the prior art:

[0021] The air supply structure of a fan and the fan of the present invention shunt the air flow into each air duct through a shunt plate and guide it to be discharged after the outlet of the centrifugal fan, making the air volume and air speed at the air outlet more uniform; at the same time, the shunt plate has a certain blocking effect on the air flow, reducing the air speed after the air flow enters the air duct and reducing the impact of the air flow on the subsequent air outlet grille and shunt structure, thereby reducing the cavity noise of the bladeless fan. Description of the Drawings

[0022] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0023] Figure 1 A schematic structural diagram showing the centrifugal fan portion of the air outlet structure of the present invention;

[0024] Figure 2 A cross-sectional view showing the overall structure of the air outlet structure of the present invention;

[0025] Figure 3 An outline diagram showing the overall structure of the air outlet structure of the present invention;

[0026] Figure 4 The corresponding velocity cloud diagram of the air outlet structure of the present invention is shown;

[0027] Figure 5 The velocity contour corresponding to the conventional air outlet structure is shown.

[0028] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily true to scale.

[0029] Reference numerals:

[0030] 1- centrifugal fan, 10- casing, 101- air outlet, 11 volute, 12- air guide structure, 121- air guide back plate, 122- volute tongue, 20- air outlet duct, 21- first air duct, 22- second air duct, 30- diverter plate, 31- arc plate segment, 32- straight plate segment, 2- impeller, 3- air outlet cavity, 4- air outlet slit, 41- first air outlet part, 42- second air outlet part, 5- connecting structure. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings.

[0032] An embodiment of the present invention provides an air supply structure of a fan, including a centrifugal fan 1, the centrifugal fan 1 includes a shell 10 with an air outlet 101, an air outlet duct 20 corresponding to the air outlet 101 is provided inside the shell 10, and a diverter plate 30 is provided inside the air outlet duct 20. The diverter plate 30 separates the air outlet duct 20 into a first air duct 21 close to the outside of the shell 10 and a second air duct 22 close to the inside of the shell 10 to achieve diverted air supply.

[0033] The outer shell 10 includes a volute 11 and an air-guiding structure 12 connected to the volute 11, and the end of the air-guiding structure 12 corresponds to the air outlet 101; the air outlet duct 20 includes an arc segment located in the volute 11 and a straight segment located in the air-guiding structure 12, and the shape of the arc segment matches the shape of the volute 11 at the corresponding position.

[0034] Specifically, as shown in the accompanying drawings Figure 1As shown, the air supply structure of the present invention is applied to a bladeless fan, which primarily includes a centrifugal fan 1 serving as the air supply power source. The centrifugal fan 1 generally includes a housing 10 and an impeller 2 disposed within the housing 10. The main body of the housing 10 is a volute 11, on which an air guide structure 12 is disposed corresponding to an air outlet 101. The area between the impeller 2 and the housing 10 forms an air outlet channel 20. Since the final air outlet direction of current centrifugal fans 1 is generally along the tangent direction of the volute 11, the air outlet channel 20 is correspondingly divided into an arcuate section within the volute 11 and a straight section within the air guide structure 12 that discharges air along the tangent direction.

[0035] Based on the above main structure of centrifugal fan 1, the present invention provides a diverter plate 30 within the outlet duct 20, forming a first duct 21 near the outside of the housing 10 and a second duct 22 near the inside of the housing 10. This diverts and guides the airflow during outlet, ensuring uniform airflow in the two ducts. At the same time, diverter plate 30 also provides a certain degree of blocking effect on the airflow output by impeller 2, reducing the impact of the airflow on the outlet grille and diverter structure at the end of the fan, thereby reducing the cavity noise of the bladeless fan.

[0036] In one embodiment, the diverter plate 30 includes an arc segment 31 and a straight segment 32 . The arc segment 31 is located in the arc segment and their extension paths match each other. The straight segment 32 is located in the straight segment.

[0037] Specifically, as shown in the accompanying drawings Figure 1 As shown, the shape of the path extending along the length direction of the diverter plate 30 matches the shape of the air outlet channel 20 in the extension direction, thereby avoiding the diverter plate 30 from having an excessive blocking effect on the airflow and ensuring the smoothness and continuity of the airflow.

[0038] In one embodiment, there is a connection point between the straight plate segment 32 and the arc plate segment 31, and there is an inclination angle β between the plane where the straight plate segment 32 is located and the tangent of the arc plate segment 31 at the connection point, 8°<β<15°, so that the width of the first air duct 21 at the straight segment gradually increases and the width of the second air duct 22 at the straight segment gradually decreases.

[0039] Specifically, as shown in the accompanying drawings Figure 1 As shown, the straight section 32 is angled toward the second air duct 22 as it approaches the air outlet 101. Furthermore, at the straight section of the outlet duct 20 corresponding to the straight section 32, the width of the first air duct 21 gradually increases, while the width of the second air duct 22 gradually decreases as it approaches the air outlet 101. Furthermore, the straight section 32 deflects the direction of the airflow output from the second air duct 22, shifting it toward the center of the volute 11 rather than along a tangent line to the volute 11. This facilitates the flow of air in subsequent ducts.

[0040] In one embodiment, an angle θ is formed between two lines connecting the two ends of the arc plate segment 31 and the center point of the volute 11 corresponding to the center of the impeller 2, and the angle θ is 60°<θ<90°.

[0041] Specifically, the angle θ (not shown in the drawings) is Figure 1 The complementary angle of the angle γ on the volute 11 is 0°<θ<30°, and the angle θ corresponds to the extension range of the arc plate segment 31 of the diverter plate 30. Based on the main structure of the centrifugal fan 1, one end of the arc plate segment 31 corresponds to the tangent point of the end of the volute 11, and the setting of the angle θ makes the arc plate segment 31 in the rectangular coordinate system established with the line between the tangent point of the end of the volute 11 and the center of the volute 11 as the x-axis, and always belongs to the first phenomenon in the upper right corner, as shown in the accompanying figure. Figure 1 As shown, the other end of the arc plate segment 31 will not enter the fourth quadrant.

[0042] Based on the air outlet principle of centrifugal fan 1, airflow is emitted outward in a spiral direction from centrifugal fan 1, and thus a certain amount of space is required for the airflow to diverge. Therefore, the other end of the arc plate segment 31 is ensured not to enter the fourth quadrant, so that the arc plate segment 31 does not prematurely guide the airflow, causing most of the airflow to enter the second air duct 22. Sufficient space is provided for the airflow to diverge, ensuring that the airflow can enter the first air duct 21 and the second air duct 22 evenly under the action of the diverter plate 30.

[0043] In one embodiment, the width of the first air duct 21 at one end away from the air outlet 101 is b, the width of the outlet flow channel 20 at one end away from the air outlet 101 is c, 0.3c <b<0.5c。

[0044] Specifically, as shown in the accompanying drawings Figure 1 As shown, the end of the first air duct 21 away from the air outlet 101 is the air inlet end of the first air duct 21. The width of its air inlet end is set, that is, the width of the air inlet ends of the first air duct 21 and the second air duct 22 are distributed to ensure that the widths of the two can achieve equal distribution of the airflow.

[0045] In one embodiment, the vertical distance between the end of the diverter plate 30 close to the air outlet 101 and the wind section of the air outlet 101 is f, and the width of the wind section of the air outlet 101 in the direction perpendicular to the width direction of the diverter plate 30 is e. <f<0.3e。

[0046] Specifically, this arrangement allows the first flow channel and the second flow channel to have an intersection at the air outlet 101. If there is still a problem of uneven air volume in the airflow in the first flow channel and the second flow channel, then under the action of natural diffusion of the airflow, the first flow channel and the second flow channel can further average the airflow at the intersection, so that the air volume and wind speed in each air channel are more evenly distributed.

[0047] In one embodiment, the air outlet cavity 3 is further included, which is connected to the housing 10 and communicates with the air outlet 101 . The air outlet cavity 3 has at least one air outlet slit 4 extending in one direction.

[0048] Specifically, as shown in the accompanying drawings Figure 2 and Figure 3 As shown, the air outlet cavity 3 is connected to the shell 10 through the connecting structure 5 and communicates with the air outlet 101, so that the airflow generated by the centrifugal fan 1 can enter the air outlet cavity 3 through the connecting structure 5 and be blown out from the air outlet slit 4 to achieve air outlet.

[0049] In one embodiment, the air outlet slit 4 extends along the direction of the air flow output through the air outlet 101, and the air outlet slit 4 includes a first air outlet portion 41 away from the air outlet 101 and a second air outlet portion 42 close to the air outlet 101. The first air outlet portion 41 corresponds to the first air duct 21, and the second air outlet portion 42 corresponds to the second air duct 22.

[0050] Specifically, as shown in the accompanying drawings Figure 2 As shown, the air outlet slit 4 is divided into two sections, namely the first air outlet portion 41 and the second air outlet portion 42, which correspond to the first air duct 21 and the second air duct 22 respectively, that is, the airflow of the first air duct 21 is blown out by the first air outlet portion 41, and the airflow of the second air duct 22 is blown out by the second air outlet portion 42.

[0051] The airflow is directed separately based on its location and flow characteristics. For example, if the first air outlet 41 is close to the air outlet 101 and closer to the second air duct 22, the airflow in the first air duct 21 requires a larger deflection angle to enter the first air outlet 41 (the bottom end of the air outlet slit 4), which is not conducive to airflow continuity. Therefore, the airflow in the first air duct 21 and the second air duct 22 is directed to the first air outlet 41 and the second air outlet 42 respectively to ensure airflow continuity.

[0052] Previously, the straight plate section 32 of the diverter plate 30 was set to be inclined, that is, in order to specifically guide the airflow of the second air duct 22 to the second air outlet portion 42 of the air outlet slit 4 (the second air outlet portion 42 is close to the air outlet 101 and has a larger deflection angle, so it is further guided by the inclined straight plate section 32), the connecting structure 5 is also correspondingly set to be biased from the air outlet 101 to the side of the center of the shell 10 to assist in guiding the airflow.

[0053] It should be noted that the air outlet cavity 3 has two flow channels corresponding to the first air channel 21 and the second air channel 22 respectively, so as to guide the airflow in the two air channels separately.

[0054] In one embodiment, the extension path of the volute 11 housing matches an Archimedean spiral and has an extension starting point and an extension ending point, and the opening corresponding to the air outlet 101 is between the extension starting point and the extension ending point; the space between the volute 11 housing and the impeller 2 inside it has a throat with the smallest width, and the throat is located between the extension starting point and the extension ending point and is close to the extension starting point.

[0055] The air guiding structure 12 includes an air guiding back plate 121 and a volute tongue 122. One end of the volute tongue 122 is connected to the extension starting point, and one end of the air guiding back plate 121 is connected to the extension ending point.

[0056] Furthermore, the width of the throat is h, the outer diameter of the impeller 2 is D, 0.05D < h < 0.1D, and h > 3 mm. The width of the throat is set based on the outer diameter of the impeller 2, specifically to slow down the air leakage of the volute 11 and improve the air output of the centrifugal fan 1.

[0057] Specifically, as shown in the attached drawings Figure 1 As shown, the distance between the extension starting point where the arc-shaped volute tongue 122 is located and the impeller 2 is greater than the width of the throat. This can reduce the working noise of the centrifugal fan 1, thereby improving the user experience. At the same time, it slows down the air leakage of the volute 11 and improves the air output of the centrifugal fan 1, thus improving the working efficiency of the centrifugal fan 1.

[0058] At the same time, the distance between the volute 11 and the impeller 2 gradually decreases from the extension starting point and reaches the minimum at the throat; then the distance between the volute 11 and the impeller 2 gradually increases from the throat towards the extension ending point. Such a setting can increase the air pressure in the volute 11, overcome the air resistance in the air duct of the air supply device, and thus improve the working efficiency of the centrifugal fan 1.

[0059] It should be noted that the size of the angle α in the attached drawings Figure 1 actually represents the length of the volute 11 between the position where the volute tongue 122 is located and the throat. This actually affects the size at the air outlet 101, and the angle of the α angle can be adjusted according to actual requirements.

[0060] The air supply structure of the present invention obtained based on the above improvements, especially the air outlet structure of the centrifugal fan 1 part, has a significant performance improvement compared with the existing centrifugal fan 1 during actual application. Refer to the velocity cloud diagrams shown in the attached drawings Figure 4 and Figure 5 As shown. At 1800 rpm, the comparison of the performance parameters between the two is shown in the following table:

[0061] flow power noise Air outlet structure of the present invention 369 50 56.1 Air outlet structure of existing technology 367 50 58.7

[0062] From Figure 4 and Figure 5It can be seen from the velocity cloud diagram shown that the diverter plate 30 proposed in the present invention has a diverting effect on the airflow of the centrifugal fan 1, which can effectively increase the airflow rate and reduce the noise without changing the power, and no high-speed fan needs to be installed.

[0063] An embodiment of the present invention further provides a fan, which includes the above-mentioned air supply structure and thus has all the technical effects thereof.

[0064] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0065] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A fan air supply structure, comprising a centrifugal fan, characterized in that: The centrifugal fan includes a housing having an air outlet, an air outlet passage corresponding to the air outlet, and a diverter plate provided inside the air outlet passage. The diverter plate divides the air outlet passage into a first air passage close to the outside of the housing and a second air passage close to the inside of the housing, so as to realize diverted air supply. It also includes an air outlet cavity connected to the housing and connected to the air outlet, wherein the air outlet cavity has at least one air outlet slit extending in one direction; The air outlet slit extends along the direction of the air flow output through the air outlet, and the air outlet slit includes a first air outlet portion away from the air outlet and a second air outlet portion close to the air outlet, the first air outlet portion corresponds to the first air duct, and the second air outlet portion corresponds to the second air duct; The diverter plate includes an arc segment and a straight segment, the arc segment is located within the arc segment and their extension paths match each other, the straight segment is located within the straight segment, and along the direction close to the air outlet, the straight segment is inclined toward the second air duct; There is an angle θ between the two lines connecting the center points of the impeller inside the volute at both ends of the arc plate segment, and the angle θ corresponds to the extension range of the arc plate segment of the diverter plate. Based on the main structure of the centrifugal fan, one end of the arc plate segment corresponds to the tangent point of the end of the volute, and the setting of the angle θ makes the arc plate segment in a rectangular coordinate system established with the line between the tangent point of the end of the volute and the center of the volute as the y-axis, and always belongs to the first quadrant in the upper right corner; the other end of the arc plate segment will not enter the fourth quadrant.

2. The air supply structure of the fan according to claim 1, characterized in that: The housing includes a volute and an air guide structure connected to the volute, and the end of the air guide structure corresponds to the air outlet; The air outlet flow channel includes an arc segment located in the volute and a straight segment located in the air guide structure, and the shape of the arc segment matches the shape of the volute at the corresponding position.

3. The air supply structure of the fan according to claim 1, characterized in that: There is a connection point between the straight plate segment and the arc plate segment, and there is an inclination angle β between the plane where the straight plate segment is located and the tangent of the arc plate segment at the connection point, 8°<β<15°, so that the width of the first air duct at the straight segment gradually increases and the width of the second air duct at the straight segment gradually decreases.

4. The air supply structure of the fan according to claim 1, characterized in that: The range of the angle θ is 60°<θ<90°.

5. The air supply structure of the fan according to any one of claims 1 to 4, characterized in that: The width of the first air duct away from the air outlet is b, the width of the outlet air duct away from the air outlet is c, 0.3c <b<0.5c。 6. The air supply structure of a fan according to any one of claims 1 to 4, characterized in that: The vertical distance between the end of the diverter plate close to the air outlet and the air flow section of the air outlet is f, and the width of the air flow section of the air outlet in the direction perpendicular to the width direction of the diverter plate is e. <f<0.3e。 7. The air supply structure of the fan according to claim 2, characterized in that: The extension path of the volute housing matches the Archimedean spiral and has an extension start point and an extension end point, and an opening corresponding to the air outlet is between the extension start point and the extension end point; The space between the volute housing and the impeller inside the volute housing has a throat portion with the smallest width, and the throat portion is located between the extension start point and the extension end point and close to the extension start point.

8. The air supply structure of the fan according to claim 7, characterized in that: The width of the throat is h, the outer diameter of the impeller is D, 0.05D < h < 0.1D, and h > 3 mm.

9. The air supply structure of the fan according to claim 7, characterized in that: The air guiding structure includes an air guiding back plate and a volute tongue. One end of the volute tongue is connected to the starting point of the extension, and one end of the air guiding back plate is connected to the ending point of the extension.

10. A fan, characterized in that: It includes the air supply structure according to any one of claims 1 to 9.

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