Fan front mesh enclosure and fan

Abstract

The utility model relates to the technical field of household appliances, and discloses a fan front mesh enclosure and a fan, the fan front mesh enclosure comprises a plurality of air guide grilles which are sequentially arranged in the circumferential direction, an air guide gap is formed between every two adjacent air guide grilles, and the windward sides of the air guide grilles are provided with air guide faces and confluence faces; the air guide face and the confluence face are arranged at a set angle so as to guide airflow to converge in the direction close to the inner side air guide gap. By means of the air guide face and the confluence face which are arranged on the windward side of the air guide grille at the set angle, airflow can be guided to converge in the direction close to the inner side air guide gap, so that the center air feeling can be enhanced, airflow turbulence divergence is reduced, long-distance air speed attenuation is reduced, the air feeling experience of a user is improved, and the problems that in the prior art, fan airflow divergence is poor, and the service life of the fan is prolonged are effectively solved. The attenuation of the central wind speed is too fast, and the long-distance wind feeling experience is poor.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a front grille of a fan and a fan. Background Art

[0002] The existing fan air supply device generally adopts a combination of a wind blade and a grille. Since the metal grille has a high cost, it has gradually been replaced by a plastic grille. However, compared with the metal grille, the plastic grille has a large wind resistance and a large air volume loss, and there are problems such as fan air flow divergence, rapid attenuation of the central wind speed, and poor wind feeling experience at a long distance. Summary of the Utility Model

[0003] In view of this, the utility model provides a front grille of a fan and a fan to solve the problems of fan air flow divergence, rapid attenuation of the central wind speed, and poor wind feeling experience at a long distance in the prior art.

[0004] In a first aspect, the utility model provides a front grille of a fan, comprising:

[0005] A plurality of air guide grilles arranged in sequence along the circumferential direction, an air guide gap is formed between two adjacent air guide grilles, and the windward side of the air guide grille has an air guide surface and a confluence surface;

[0006] The air guide surface and the confluence surface are arranged at a set angle to guide the air flow to converge towards the direction close to the inner air guide gap.

[0007] Beneficial effects: By arranging the air guide surface and the confluence surface at a set angle on the windward side of the air guide grille, the air flow can be guided to converge towards the direction close to the inner air guide gap, thereby enhancing the central wind feeling, reducing the air flow turbulence divergence, reducing the long-distance wind speed attenuation, improving the user's wind feeling experience, and effectively solving the problems of fan air flow divergence, rapid attenuation of the central wind speed, and poor wind feeling experience at a long distance in the prior art.

[0008] In an optional embodiment, along the gas flow direction, the air guide surface is a first inclined surface that gradually inclines outwards, and at least one side of the air guide surface is provided with a confluence surface.

[0009] Beneficial effects: By adopting the design of the first inclined surface that gradually inclines outwards and diffuses for the air guide surface, the air supply range can be increased, and large air volume and large-range air supply can be realized. Moreover, by arranging the confluence surface on at least one side of the air guide surface, the air flow can be guided to converge towards the direction close to the inner air guide gap. Thus, on the basis of solving the large air volume air supply range, the problems of air flow divergence, rapid attenuation of the central wind speed, and weak long-distance wind feeling can be solved, and safe air supply with large air volume, high wind feeling, high performance, and economy can be realized.

[0010] In an optional embodiment, the confluence surface includes a first confluence surface arranged on the air outlet side of the air guide surface;

[0011] Set the inclination angle of the air guiding surface as α, and the inclination angle of the first confluence surface as β, where β < 180° - α.

[0012] Beneficial effects: By setting the first confluence surface on the air outlet side of the air guiding surface, and setting the included angle between the first confluence surface and the air guiding surface to be less than 180°, the first confluence surface can play a role in guiding the flow field, straightening the inclined part of the wind direction, which is more conducive to improving the wind gathering effect and increasing the central wind speed.

[0013] In an optional embodiment, 90° ≤ β ≤ 120°.

[0014] Beneficial effects: By setting the included angle between the first confluence surface and the air guiding surface between 90° and 120°, the best wind gathering effect can be achieved.

[0015] In an optional embodiment, the confluence surface further includes a second confluence surface provided on the air inlet side of the air guiding surface;

[0016] Set the inclination angle of the air guiding surface as α, and the inclination angle of the second confluence surface as γ, where γ ≥ α.

[0017] Beneficial effects: By setting the second confluence surface on the air inlet side of the air guiding surface, and setting the inclination angle γ of the second confluence surface to be greater than or equal to the inclination angle α of the air guiding surface, the second confluence surface can play a role in guiding the flow field, increasing the air inlet area and air inlet volume.

[0018] In an optional embodiment, 90° ≤ γ ≤ 120°.

[0019] Beneficial effects: By setting the included angle between the second confluence surface and the air guiding surface between 90° and 120°, the air inlet area and air inlet volume can be effectively ensured.

[0020] In an optional embodiment, the air guiding surface is an inclined surface, and the inclination direction of the air guiding surface is the same as the rotation direction of the fan blades.

[0021] Beneficial effects: By setting the inclination angle direction of the air guiding surface to be the same as the rotation direction of the fan blades, the impact of the fan blade airflow on the grille can be reduced, the wind resistance can be lowered, and the wind gathered at the center of the fan blades is more likely to spread out, further increasing the wind speed and wind field, expanding the air supply area, and increasing the air volume.

[0022] In an optional embodiment, the air guiding surface is a flat straight surface, and the confluence surface is an inclined surface provided on the air outlet side of the air guiding surface and gradually inclined inward.

[0023] Beneficial effects: By adopting a flat straight surface for the air guiding surface and an inclined surface for the confluence surface, the air flow turbulence divergence can be further reduced, the central wind feeling can be enhanced, the wind speed attenuation over a long distance can be reduced, and the problem of weak wind feeling over a long distance can be solved.

[0024] In an alternative embodiment, the front grille of the fan includes a first wind expansion area at the center and a second wind expansion area surrounding the first wind expansion area. The air guiding grille includes:

[0025] A plurality of first ribs are sequentially arranged in the circumferential direction in the first wind expansion area. The windward side of the first rib is provided with an air guiding surface and a confluence surface;

[0026] A plurality of second ribs are sequentially arranged in the circumferential direction in the second wind expansion area. Along the gas flow direction, the windward side of the second rib is set as a second inclined surface that gradually inclines and diffuses outward.

[0027] Beneficial effects: The front grille of the fan includes a first rib in the inner circle and a second rib in the outer circle. By adopting the design of an air guiding surface and a confluence surface on the windward side of the first rib in the inner circle, it is more beneficial to improve the air gathering effect of the fan, enhance the central wind speed and the wind feeling experience. By adopting the design of gradually inclining and diffusing outward for the second rib in the outer circle, the air supply range can be expanded, the air volume tested in the outer ring can be increased, and safe air supply with a large air volume, high wind feeling, high performance and economy can be achieved. On the basis of the large air volume air supply range, the problems of existing fan air flow divergence and too fast attenuation of the central wind speed, and weak wind feeling over a long distance are solved.

[0028] In an alternative embodiment, one end of the first rib close to the center of the front grille of the fan is set as the first end, and the end close to the outer periphery of the front grille of the fan is set as the second end;

[0029] The inclination angle of the air guiding surface at the first end is α1, α1 < 90°, the inclination angle of the air guiding surface at the second end is α2, α2 < 90°, and α1 ≤ α2.

[0030] Beneficial effects: The inclination angles of the air guiding surfaces at the two ends of the first rib can be the same, or preferably, the inclination angles of the air guiding surfaces at the two ends of the first rib are different. By adopting the design of different inclination angles of the air guiding surfaces at the two ends of the first rib, the twist pitch of the first rib can be made larger and the wind resistance loss can be smaller. By setting α1 to be less than or equal to α2, the reduction gradient of the central wind speed can be compensated, making the central wind speed gradient a little smaller and showing a gradual change trend, effectively preventing the middle wind speed from dispersing too fast and the central wind speed from dropping too low quickly, resulting in a poor wind feeling experience over a long distance.

[0031] In an alternative embodiment, both the first rib and the second rib are twisted ribs, and the twisting directions of the first rib and the second rib are opposite.

[0032] Beneficial effects: Both the first rib and the second rib adopt twisted ribs. The spacing of the twisted ribs is larger, which can increase the air volume outlet area of the front grille of the fan. Moreover, the twisting directions of the first rib and the second rib are opposite, so that the air guiding surface on the first rib and the second inclined surface on the second rib rotate in opposite directions, and the inclined directions are opposite, further increasing the air volume outlet area. In addition, the first rib and the second rib form an S-shaped air guiding rib, which is more beautiful in shape.

[0033] In an optional embodiment, along the gas flow direction, the windward side of the second rib is set as a second inclined surface that gradually inclines and diffuses outward;

[0034] Set one end of the second rib close to the first rib as the third end, and the end far from the first rib as the fourth end;

[0035] The inclination angle of the second inclined surface at the third end is δ1, δ1 > 90°, the inclination angle of the second inclined surface at the fourth end is δ2, δ2 > 90°, and δ1 ≤ δ2.

[0036] Beneficial effects: By setting the inclination angle δ1 of the second inclined surface of the second rib close to the center side to be less than or equal to the inclination angle δ2 of the second inclined surface close to the outer periphery side, the wind speed and air volume at the center side can be increased, effectively preventing the problem that the air volume diffusion on the outer ring side is too large, resulting in a rapid decrease in the center wind speed and a poor long-distance wind feeling experience.

[0037] In a second aspect, the present invention also provides a fan, including:

[0038] A fan head having an air outlet;

[0039] The front grille of the fan according to any of the above embodiments, and the front grille of the fan is installed at the air outlet. Description of the Drawings

[0040] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0041] Figure 1 It is a cross-sectional air outlet schematic diagram of a flat air guiding grille in the prior art;

[0042] Figure 2 It is a cross-sectional air outlet schematic diagram of an air guiding grille provided with an air guiding surface and a confluence surface in an embodiment of the present invention;

[0043] Figure 3Schematic diagram of the structure of the fan head in the embodiment of the present utility model;

[0044] Figure 4 Schematic diagram of the structure of the front grille of the fan in the embodiment of the present utility model;

[0045] Figure 5 is Figure 4 Partial enlarged sectional view of;

[0046] Figure 6 is Figure 4 Side view of;

[0047] Figure 7 is Figure 6 Enlarged view of part A in;

[0048] Figure 8 Schematic diagram of the structure of the first air diffusion area in the embodiment of the present utility model;

[0049] Figure 9 is Figure 8 Sectional view in the direction of C-C in;

[0050] Figure 10 is Figure 9 Enlarged view of part B in;

[0051] Figure 11 Schematic diagram of the structure of the second air diffusion area in the embodiment of the present utility model;

[0052] Figure 12 is Figure 11 Sectional view in the direction of D-D in;

[0053] Figure 13 is Figure 12 Enlarged view of part E in;

[0054] Figure 14 Axonometric schematic diagram of part of the structure of the front grille of the fan in the embodiment of the present utility model;

[0055] Figure 15 Partial schematic diagram of the structure of the first rib in the first implementation manner in the embodiment of the present utility model;

[0056] Figure 16 is Figure 15 Cross-sectional view of;

[0057] Figure 17 Partial schematic diagram of the structure of the first rib in the second implementation manner in the embodiment of the present utility model;

[0058] Figure 18 is Figure 17 Cross-sectional view of;

[0059] Figure 19Partial structural schematic diagram of the first rib in the third embodiment of the present utility model;

[0060] Figure 20 is Figure 19 cross-sectional view;

[0061] Figure 21 Partial structural sketch of the front grille of the fan in the embodiment of the present utility model;

[0062] Figure 22 is Figure 21 structural schematic diagram from the a-a perspective in

[0063] Figure 23 is Figure 21 structural schematic diagram from the b-b perspective in

[0064] Figure 24 is Figure 21 structural schematic diagram from the c-c perspective in

[0065] Figure 25 is Figure 21 structural schematic diagram from the d-d perspective in

[0066] Explanation of reference numerals:

[0067] 1. Front grille of the fan;

[0068] 100. First air diffusion area; 200. Second air diffusion area; 300. Air guiding gap;

[0069] 10. Air guiding grille; 101. Air guiding surface; 102. Confluence surface; 1021. First confluence surface; 1022. Second confluence surface;

[0070] 11. First rib; 12. Second rib; 121. Second inclined surface;

[0071] 20. Partition rib;

[0072] 2. Wind blade. Detailed implementation manners

[0073] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0074] Existing fan air supply devices generally adopt a combination of thin - sheet impellers and metal or plastic mesh covers. The front mesh cover of the fan can change the air outlet type of the fan: air - concentrating type or diffusing type, improving the wind speed and air volume. Among them, the air - concentrating type can increase the wind speed, and the diffusing type can increase the air volume. Since the cost of the metal mesh cover is high, it has gradually been replaced by a plastic mesh cover. However, the plastic mesh cover has a problem of relatively large wind resistance, so a part of the air volume will be lost, resulting in a reduction in the air volume and wind feeling of the fan.

[0075] The fans in the related art use plastic grilles. Compared with metal grilles, the plastic grilles have a large wind resistance and a large air volume loss, resulting in a problem of insufficient energy efficiency. The plastic grilles usually adopt an inclined diffusion design, which can expand the air supply range and improve the measured air volume and energy efficiency problems. However, due to the diffusion of its fan grille, the turbulence increases, resulting in a weakened central wind feeling, too fast wind speed attenuation, and no wind feeling at a long distance, which causes a poor user experience.

[0076] The following combines Figures 1 to 25 to describe the embodiments of the present invention.

[0077] According to an embodiment of the present invention, on the one hand, the present invention provides a front mesh cover 1 of a fan, including a plurality of air guide grilles 10 arranged in sequence along the circumferential direction. An air guide gap 300 is formed between two adjacent air guide grilles 10. The windward side of the air guide grille 10 has an air guide surface 101 and a confluence surface 102; the air guide surface 101 and the confluence surface 102 are arranged at a set angle to guide the air flow to converge in the direction close to the inner air guide gap 300.

[0078] In the above - mentioned embodiment, by the air guide surface 101 and the confluence surface 102 arranged at a set angle on the windward side of the air guide grille 10, the air flow can be guided to converge in the direction close to the inner air guide gap 300, thereby enhancing the central wind feeling, reducing the turbulent divergence of the air flow, reducing the wind speed attenuation at a long distance, improving the user's wind feeling experience, and effectively solving the problems of air flow divergence, too fast central wind speed attenuation, and poor long - distance wind feeling experience in the prior art.

[0079] Specifically, the air guide surface 101 is an inclined surface or a flat surface. Preferably, the confluence surface 102 is connected to the air outlet side of the air guide surface 101, and the included angle between the air guide surface 101 and the confluence surface 102 is less than 180°. The confluence surface 102 can adopt an inclined surface or a flat surface. The confluence surface 102 can straighten part of the wind or guide and converge the air flow in the direction close to the inner air guide gap 300, reduce the turbulent divergence of the air flow, enhance the central wind feeling, reduce the wind speed attenuation at a long distance, and improve the wind feeling experience.

[0080] Furthermore, when the air guide surface 101 is an inclined surface, the confluence surface 102 can be an inclined surface or a flat surface; when the air guide surface 101 is a flat surface, the confluence surface 102 is an inclined surface.

[0081] In some embodiments, along the gas flow direction, the air guiding surface 101 is a first inclined surface that gradually slopes outward, and at least one side of the air guiding surface 101 is provided with a converging surface 102.

[0082] In the above embodiments, by adopting the design of the first inclined surface that gradually slopes outward and diffuses, the air guiding surface 101 can increase the air supply range, achieve a large air volume and a wide air supply range, and through the converging surface 102 provided on at least one side of the air guiding surface 101, the air flow can be guided to converge towards the direction close to the inner air guiding gap 300. Thus, on the basis of solving the problem of the air supply range of a large air volume, the problems of air flow divergence and too rapid attenuation of the central wind speed, and weak wind feeling at a long distance can be solved, realizing safe air supply with a large air volume, high wind feeling, high performance and economy.

[0083] In other alternative embodiments, the air guiding surface 101 is a flat surface, and the converging surface 102 is an inclined surface that is arranged on the air outlet side of the air guiding surface 101 and gradually slopes inward.

[0084] In the above embodiments, by adopting a flat air guiding surface 101 and an inclined surface for the converging surface 102, the air flow turbulence divergence can be further reduced, the central wind feeling can be enhanced, the wind speed attenuation at a long distance can be reduced, and the problem of weak wind feeling at a long distance can be solved.

[0085] In some embodiments, as Figure 19 、 Figure 20 shown, the converging surface 102 includes a first converging surface 1021 arranged on the air outlet side of the air guiding surface 101; setting the inclination angle of the air guiding surface 101 as α and the inclination angle of the first converging surface 1021 as β, wherein β < 180° - α.

[0086] In the above embodiments, through the first converging surface 1021 arranged on the air outlet side of the air guiding surface 101, and by setting the included angle between the first converging surface 1021 and the air guiding surface 101 to be less than 180°, the first converging surface 1021 can play a role in guiding the flow field, straightening the inclined part of the wind direction, which is more conducive to improving the wind gathering effect and increasing the central wind speed.

[0087] In some embodiments, 90° ≤ β ≤ 120°.

[0088] In the above embodiments, by setting the included angle between the first converging surface 1021 and the air guiding surface 101 between 90° and 120°, the best wind gathering effect can be achieved.

[0089] In some embodiments, the converging surface 102 further includes a second converging surface 1022 arranged on the air inlet side of the air guiding surface 101; setting the inclination angle of the air guiding surface 101 as α and the inclination angle of the second converging surface 1022 as γ, wherein γ ≥ α.

[0090] In the above embodiments, by providing the second confluence surface 1022 on the air inlet side of the air guiding surface 101, and by setting the inclination angle γ of the second confluence surface 1022 to be greater than or equal to the inclination angle α of the air guiding surface 101, the second confluence surface 1022 can play a role in guiding the flow field, increasing the air inlet area and the air inlet volume.

[0091] Preferably, γ > α. By setting the inclination angle of the second confluence surface 1022 to be greater than the inclination angle of the air guiding surface 101, the air inlet area and the air inlet volume can be increased.

[0092] In some embodiments, 90° ≤ γ ≤ 120°.

[0093] In the above embodiments, by setting the angle between the second confluence surface 1022 and the air guiding surface 101 to be between 90° and 120°, the air inlet area and the air inlet volume can be effectively ensured.

[0094] Preferably, γ > 90°.

[0095] It should be noted that, as shown in combination with Figure 19 、 Figure 20 In this embodiment, the inclination angles of the air guiding surface 101, the first confluence surface 1021, and the second confluence surface 1022 are all the angles with respect to the horizontal plane.

[0096] As shown in combination with Figures 15 to 20 Along the air outlet direction, the first rib 11 is successively divided into a second confluence section, an air guiding section, and a first confluence section according to the provided second confluence surface 1022, air guiding surface 101, and first confluence surface 1021. Among them, the height of the first confluence section is L1, the height of the air guiding section is L, and the height of the second confluence section is L2, where L > 0, L1 ≥ 0, L2 ≥ 0, and at most one of L1 and L2 is 0 mm. Usually, 0 < L ≤ 15 mm, 0 ≤ L1 ≤ 10 mm, and 0 ≤ L2 ≤ 10 mm. That is, the height of the first confluence surface 1021 is L1, the height of the air guiding surface 101 is L, and the height of the second confluence surface 1022 is L2. By adopting the design of the first confluence section and the second confluence section, the first confluence section and the second confluence section have a flow field guiding effect, which can straighten the wind direction of the inclined air guiding section of the first rib 11, is beneficial to improving the wind gathering effect and increasing the central wind speed, and can not only increase the air volume but also enhance the wind feeling.

[0097] In this embodiment, the first confluence section, the air guiding section, and the second confluence section can be combined in the following three ways:

[0098] ① First confluence section + air guiding section + second confluence section; ② First confluence section + air guiding section; ③ Air guiding section + second confluence section.

[0099] Effect comparison: Air volume ③ > ① ≈ ②; Wind feeling: ① > ② > ③.

[0100] In some embodiments, the air guiding surface 101 is an inclined surface, and the inclination direction of the air guiding surface 101 is the same as the rotation direction of the fan blades 2.

[0101] In the above embodiments, by setting the inclination angle direction of the air guiding surface 101 to be the same as the rotation direction of the fan blades 2, the impact of the airflow of the fan blades 2 on the grille can be reduced, the wind resistance can be lowered, so that the wind concentrated at the center of the fan blades 2 is more easily diffused, further increasing the wind speed and wind field, expanding the air supply area, and improving the air volume.

[0102] In some embodiments, the front grille 1 of the fan includes a first air diffusion area 100 located at the center and a second air diffusion area 200 located outside the first air diffusion area 100. The air guiding grille 10 includes: a plurality of first rib strips 11 and a plurality of second rib strips 12. The plurality of first rib strips 11 are sequentially arranged in the first air diffusion area 100 along the circumferential direction. An air guiding surface 101 and a confluence surface 102 are provided on the windward side of the first rib strips 11. The plurality of second rib strips 12 are sequentially arranged in the second air diffusion area 200 along the circumferential direction. Along the gas flow direction, the windward side of the second rib strips 12 is set as a second inclined surface 121 that gradually inclines and diffuses outward.

[0103] In the above embodiments, the front grille 1 of the fan includes the first rib strips 11 located in the inner circle and the second rib strips 12 located in the outer circle. By adopting the design of the air guiding surface 101 and the confluence surface 102 on the windward side of the first rib strips 11 in the inner circle, it is more conducive to improving the wind gathering effect of the fan, enhancing the wind speed and wind feeling experience at the center. By adopting the design of gradually inclining and diffusing outward for the second rib strips 12 in the outer circle, the air supply range can be expanded, the air volume of the outer ring test can be increased, and safe air supply with large air volume, high wind feeling, high performance and economy can be realized. On the basis of the large air volume air supply range, the problems of the existing fan such as the divergence of the air flow and the too fast attenuation of the wind speed at the center, and the weak wind feeling at a long distance are solved.

[0104] Specifically, in this embodiment, the windward side of the second rib strips 12 can be set as the second inclined surface 121 that gradually inclines and diffuses outward, or the windward surface of the second rib strips 12 can also be set to 90°. Preferably, the inclination angle of the second inclined surface 121 is greater than 90°, which can expand the air supply range. The main function of the second air diffusion area 200 is to expand the air volume of the outer ring, and there is no need to be set as multi-segment inclination like the first rib strips 11, and single-segment inclination is sufficient. The rib strip structures of the first air diffusion area 100 and the second air diffusion area 200 are different, and the inclination angles are different. Preferably, the inclination angle of the second rib strips 12 ≥ the inclination angle of the first rib strips 11.

[0105] In this embodiment, the outer ring grille of the front grille 1 of the fan adopts an inclined diffusion design, which can expand the air supply range and increase the air volume of the outer ring during the test. The inner ring grille adopts a segmented design. Specifically, along the air outlet direction, the air guide grille 10 is successively provided with a second confluence section, an air guide section, and a first confluence section. A second confluence surface 1022 is provided on the windward side of the second confluence section, and the second confluence surface 1022 can increase the air inlet area. An inclined air guide surface 101 is provided on the windward side of the air guide section, and the air guide surface 101 can expand the air supply range. A first confluence surface 1021 is provided on the windward side of the first confluence section, and the first confluence surface 1021 can accelerate the air outlet speed. The inclination angles of the air guide surfaces 101 at the roots of both ends of the first rib 11 are different, the twisting pitch of the rib is larger, and the wind resistance loss is smaller. By adopting the segmented design in this embodiment and through the design of the second confluence section and the first confluence section, the air flow of the inclined air guide surface 101 can be straightened, the air flow turbulence divergence can be reduced, the central air feeling can be enhanced, the wind speed attenuation at a long distance can be reduced, the air feeling experience can be improved, and the problem of weak air feeling at a long distance can be solved on the basis of ensuring the air supply range of a large air volume.

[0106] In some embodiments, as shown in Figures 21 to 23 set, one end of the first rib 11 close to the center of the front grille 1 of the fan is the first end, and one end close to the outer periphery of the front grille 1 of the fan is the second end; the inclination angle of the air guide surface 101 at the first end is α1, α1 < 90°, the inclination angle of the air guide surface 101 at the second end is α2, α2 < 90°, and α1 ≤ α2.

[0107] In the above embodiment, the inclination angles of the air guide surfaces 101 at the roots of both ends of the first rib 11 can be the same, or preferably, the inclination angles of the air guide surfaces 101 at the roots of both ends of the first rib 11 are different. By adopting the design with different inclination angles of the air guide surfaces 101 at the roots of both ends of the first rib 11, the twisting pitch of the first rib 11 can be made larger and the wind resistance loss can be smaller. By setting α1 to be less than or equal to α2, the gradient of the central wind speed reduction can be compensated, making the central wind speed gradient a little smaller and showing a gradual change trend, effectively preventing the middle wind speed from spreading too fast and the central wind speed from dropping too low quickly, resulting in a poor long-distance air feeling experience.

[0108] In this embodiment, the magnitudes of α1 and α2 can be set according to the performance test experiment. Exemplarily, the inclination angle α1 of the air guide surface 101 at the first end of the first rib 11 is set to 10°, and the inclination angle α2 of the air guide surface 101 at the second end of the first rib 11 is set to 20°. Alternatively, α1 and α2 can also be set to the same magnitude, for example, both are set to 20°. The numerical magnitudes of α1 and α2 in this embodiment are not specifically limited as long as α1 ≤ α2 and the air volume meets the set requirements.

[0109] It should be noted that in this embodiment, the first rib 11 can adopt the design of the air guiding surface 101 and the confluence surface 102 as a whole, or can also adopt the design of arranging the air guiding surface 101 and the confluence surface 102 in one or more segments. The specific lengths of the air guiding surface 101 and the confluence surface 102 only need to ensure that the air volume and air feeling meet the requirements, and the specific values can be determined according to performance test.

[0110] In this embodiment, the air guiding grille 10 can be constructed into any linear shape. Preferably, the line of the air guiding grille 10 is selected as a streamline shape, which can effectively reduce the noise generated by the interference between the air flow and the air guiding grille 10.

[0111] Specifically, the single root of the first rib 11 and the second rib 12 is matched to a smooth linear shape, such as a straight line, an S-shaped streamline, etc. Among them, the second rib 12 is a twisted rib with a streamline or straight line shape, or can also be a straight rib.

[0112] In some preferred embodiments, both the first rib 11 and the second rib 12 are twisted ribs, and the twisting directions of the first rib 11 and the second rib 12 are opposite.

[0113] In the above embodiment, both the first rib 11 and the second rib 12 adopt twisted ribs. The spacing of the twisted ribs is larger, which can increase the air volume outlet area of the front grille 1 of the fan. Moreover, the twisting directions of the first rib 11 and the second rib 12 are opposite, so that the air guiding surface 101 on the first rib 11 and the second inclined surface 121 on the second rib 12 rotate in opposite directions, and the inclined directions are opposite, further increasing the air volume outlet area. In addition, the first rib 11 and the second rib 12 form an S-shaped air guiding rib, which is more beautiful in shape.

[0114] In some embodiments, it is set that one end of the second rib 12 close to the first rib 11 is the third end, and the end far from the first rib 11 is the fourth end; the inclination angle of the second inclined surface 121 at the third end is δ1, δ1>90°, and the inclination angle of the second inclined surface 121 at the fourth end is δ2, δ2>90°, and δ1≤δ2.

[0115] In the above embodiment, by setting the inclination angle δ1 of the second inclined surface 121 of the second rib 12 close to the center side to be less than or equal to the inclination angle δ2 of the second inclined surface 121 close to the outer peripheral side, the wind speed and air volume at the center side can be increased, effectively preventing the problem that the air volume diffusion on the outer ring side is too large, resulting in a rapid decrease in the center wind speed and a poor long-distance air feeling experience.

[0116] Such as Figures 21 to 25As shown, within the first wind expansion region 100, along the a-a section, the inclination angle of the air guiding surface 101 of the first rib 11 at the root of the first end is α1, where α1 ≤ 90°; along the b-b section, the inclination angle of the air guiding surface 101 of the first rib 3 at the root of the second end is α2, where α2 ≤ 90°, and generally α1 ≤ α2. Within the second wind expansion region 200, along the c-c section, the angle of the second inclined surface 121 at the root of the second rib 12 is δ1, where δ1 ≥ 90°; along the d-d section, the angle of the second inclined surface 121 at the root of the second rib 12 is δ2, where δ2 ≥ 90°, and generally δ1 ≤ δ2.

[0117] Preferably, in this embodiment, the inclination angle α1 of the root of the air guiding surface 101 of the first rib 11 is further set to 50° ≤ α1 ≤ 90°, and α2 is further set to 60° ≤ α2 ≤ 90°; the inclination angle δ1 of the root of the second rib 12 is further set to 90° ≤ δ1 ≤ 130°, and δ2 is further set to 90° ≤ δ2 ≤ 140°. The height of the first confluence section of the first rib 11 is L1, the height of the air guiding section is L, and the height of the second confluence section is L2, which is further set to 0 < L < 8 mm, 0 ≤ L1 < 5 mm, 0 ≤ L2 < 5 mm. The cross-sectional angle β of the first confluence section is further set to β ≤ 100°; the cross-sectional angle γ of the first confluence section is further set to γ ≥ 80°; according to the test data, within this range of the inclination angles α1, α2, δ1, δ2, β, and γ, the improvement in air volume and air speed is more significant.

[0118] Taking α1 = 83°, α2 = 70°, δ1 = 108°, δ2 = 128°, β = 90°, γ = 90°, L = 6 mm, L1 = 3.5 mm, and L2 = 1.5 mm as an example, the comparison of the air delivery volume between the fan provided by this application and the traditional fan is shown in Table 1:

[0119] Table 1

[0120]

[0121] In some embodiments, the front grill 1 of the fan further includes an inner ring rib, an outer ring rib, and a partition rib 20 disposed between the inner ring rib and the outer ring rib. The partition rib 20 is annular, and there is at least one group of partition ribs 20. A ring-shaped first wind expansion region 100 is formed between the partition rib 20 and the inner ring rib, and a ring-shaped second wind expansion region 200 is formed between the partition rib 20 and the outer ring rib. A plurality of first ribs 11 and a plurality of second ribs 12 are respectively distributed at intervals along the circumferential direction within the first wind expansion region 100 and the second wind expansion region 200.

[0122] In other deformation solutions, there are two sets of partition ribs 20 arranged at intervals. Among them, a set of partition ribs 20 located on the central side forms an annular first air-diffusing region 100 between the inner ring ribs, and the region between the two sets of partition ribs 20 forms a second air-diffusing region 200.

[0123] This embodiment is based on the cooperation of the wind blade 2 and the front grille 1 of the fan. The rotating wind blade 2 is tangent to the surrounding air, and the rotation direction of the wind blade 2 is the same as the inclination angle direction of the air guiding surface 101, reducing the air volume loss caused by the air resistance between the air guiding grille 10 of the front grille 1 of the fan and the wind blade 2. The air guiding grille 10 at least partially adopts a multi-segment air guiding design, which can solve the problems that the existing inclined grille can send air with a large air volume and a large range, but there are problems such as air flow divergence, too fast attenuation of the central wind speed, and weak wind feeling at a long distance.

[0124] Combined with Figures 3 to 14 As shown in the figure, taking the clockwise rotation of the wind blade 2 as an example, the specific structure and principle of the front grille 1 of the fan will be introduced:

[0125] This embodiment provides a front grille 1 of a fan with double helix inclined straight extension acceleration. The front grille includes a first air-diffusing region 100 and a second air-diffusing region 200. There are multiple twisted first ribs 11 in the first air-diffusing region 100, and multiple twisted second ribs 12 in the second air-diffusing region 200. This embodiment adopts a segmented air guiding grille 10. Among them, the first rib 11 has three segments, namely a second converging section, an air guiding section, and a first converging section. The air guiding section of the first rib 11 and the second rib 12 are twisted ribs with different twisting angles of the first inclined surface and the second inclined surface 121 at both ends respectively, and the air guiding section is a twisted rib with a streamline or straight-line shape. The first converging section and the second converging section are extension sections of the upper and lower top surfaces of the air guiding section.

[0126] Among them, the second converging section, the air guiding section, and the first converging section can be used in combination, such as the second converging section + the air guiding section + the first converging section, the second converging section + the air guiding section, and the first converging section + the air guiding section. By adopting the segmented air guiding grille 10, on the basis of ensuring a large air volume for the air supply range, the problems of a wide air supply range but too fast attenuation of the central wind speed and poor wind feeling experience at a long distance are solved. By improving the structure of the air guiding grille 10 of the front grille 1 of the fan while maintaining the best installation distance, safe air supply with a large air volume, high wind speed, high performance, and economy is realized.

[0127] Combined with Table 2 shown below, by adopting the segmented air guiding grille 10 in this embodiment, while ensuring a large air volume, the central wind speed is significantly increased during long-distance air supply, and the air supply distance is also significantly increased, effectively solving the problems of air flow divergence of the fan in the prior art, too fast attenuation of the central wind speed, and poor wind feeling experience at a long distance.

[0128] Table 2

[0129]

[0130] According to an embodiment of the present utility model, on the other hand, there is provided a fan, including a fan head and the front grille 1 of any one of the above embodiments, the fan head having an air outlet; the front grille 1 of the fan is installed at the air outlet.

[0131] Furthermore, a wind blade 2 is disposed inside the fan head. Preferably, the fan in this embodiment is an axial flow fan.

[0132] The present utility model embodiment provides a front grille design of a segmented air guide grille 10, which is mainly applied to an axial flow fan. The front grille includes a first air expansion region 100 and a second air expansion region 200. A plurality of twisted first ribs 11 are provided inside the first air expansion region 100, and a plurality of twisted second ribs 12 are provided inside the second air expansion region 200. The first ribs 11 and the second ribs 12 are respectively arranged in sequence along the circumferences of the first air expansion region 100 and the second air expansion region 200. Among them, as Figure 3 , Figure 4 , Figure 14 , Figure 21 shown, the arc directions of the first ribs 11 in the first air expansion region 100 and the second ribs 12 in the second air expansion region 200 are opposite, and extend out from the central direction of the front grille.

[0133] The rotating wind blade 2 is tangent to the surrounding air and pushes the air forward in a spiral shape. There will inevitably be air resistance between the front grille of the fan and the wind blade 2, resulting in a loss of air volume. Therefore, in this embodiment, by optimizing the angle of the air guide grille 10, the air volume is increased and the air resistance loss is reduced. The inclination angle direction of the air guiding surface 101 of the first rib 11 is the same as the rotation direction of the wind blade 2, reducing the impact of the air flow of the wind blade 2 on the grille and reducing the air resistance. The air gathered at the center of the wind blade 2 diffuses out, further increasing the wind speed and wind field, expanding the air supply area, and increasing the air volume. The first converging surface 1021 and the second converging surface 1022 can straighten at least part of the air field that is inclined and diverging on the air guiding surface 101, improving the wind speed and wind feeling at the center of the wind field.

[0134] Although the embodiments of the present utility model have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A fan front grille, characterized in that: include: A plurality of air guide grilles (10) are sequentially arranged along the circumferential direction, an air guide gap (300) is formed between two adjacent air guide grilles (10), and the windward side of the air guide grilles (10) comprises an air guide surface (101) and a converging surface (102); The air guide surface (101) and the converging surface (102) are arranged at a set angle to guide the airflow to converge in a direction close to the inner air guide gap (300).

2. The fan front grille according to claim 1, characterized in that: Along the gas flow direction, the wind guide surface (101) is a first inclined surface that gradually inclines outwards, and the converging surface (102) is provided on at least one side of the wind guide surface (101).

3. The fan front grille according to claim 2, characterized in that: The converging surface (102) comprises a first converging surface (1021) arranged on the wind outlet side of the wind guide surface (101); The inclination angle of the wind guide surface (101) is set to α, and the inclination angle of the first converging surface (1021) is set to β, wherein β<180°-α.

4. The fan front grille according to claim 2 or 3, characterized in that: The converging surface (102) further comprises a second converging surface (1022) arranged on the wind inlet side of the wind guide surface (101); The inclination angle of the wind guide surface (101) is set to α, and the inclination angle of the second converging surface (1022) is set to γ, wherein γ≥α.

5. The fan front grille according to any one of claims 1 to 3, characterized in that: The wind guide surface (101) is an inclined surface, and the inclination direction of the wind guide surface (101) is the same as the rotation direction of the fan blades (2).

6. The fan front grille according to claim 1, characterized in that: The wind guide surface (101) is a flat surface, and the converging surface (102) is an inclined surface arranged on the wind outlet side of the wind guide surface (101) and gradually inclined inwards.

7. The fan front grille (1) according to any one of claims 1 to 3, characterized in that: The fan front grille (1) comprises a first wind expansion area (100) located in the center and a second wind expansion area (200) located outside the first wind expansion area (100), and the wind guide grille (10) comprises: A plurality of first ribs (11) are sequentially arranged in the first wind expansion area (100) along the circumferential direction, and the windward side of the first ribs (11) is provided with the wind guide surface (101) and the converging surface (102); A plurality of second ribs (12) are sequentially arranged in the second air diffusion area (200) along the circumferential direction, and along the gas flow direction, the windward side of the second ribs (12) is arranged as a second inclined surface (121) that diffuses outward in a step-by-step manner.

8. The fan front grille according to claim 7, characterized in that: The end of the first rib (11) close to the center of the front fan mesh cover (1) is set as the first end, and the end close to the outer periphery of the front fan mesh cover (1) is set as the second end; The inclination angle of the wind guide surface (101) located at the first end is α1, α1<90°, and the inclination angle of the wind guide surface (101) located at the second end is α2, α2<90°, and α1≤α2.

9. The fan front grille according to claim 7, characterized in that: The first rib (11) and the second rib (12) are both twisted ribs, and the twisting directions of the first rib (11) and the second rib (12) are opposite.

10. The fan front grille according to claim 7, characterized in that: An end of the second rib (12) close to the first rib (11) is set as the third end, and an end away from the first rib (11) is set as the fourth end; The second inclined surface (121) located at the third end has an inclination angle of δ1, δ1>90°, and the second inclined surface (121) located at the fourth end has an inclination angle of δ2, δ2>90°, δ1≤δ2.

11. A fan, characterized in that: include: A fan head, wherein the fan head has an air outlet; The fan front mesh cover (1) according to any one of claims 1 to 10, wherein the fan front mesh cover (1) is installed at the air outlet.

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