Vortex wind gathering fan blade and fan with same

Abstract

The vortex wind gathering fan blade comprises an impeller and a blade body, the blade body is arranged on the peripheral face of the impeller, the blade body comprises a blade top, a blade bottom, a blade front edge and a blade rear edge, and the blade top and the blade bottom oppositely conduct vortex twisting to form a first curved surface portion and a second curved surface portion. A vortex included angle is formed between the blade top and the blade bottom, a sharp angle is formed between the blade front edge and the blade bottom, the blade is connected with the impeller through the blade rear edge, and the blade rear edge extends to an air inlet of the impeller conical surface along an air outlet of the impeller conical surface. Vortex blades on the outer ring of the impeller rotate, the vortex blades drive wind power to move forwards and are matched with the middle position of the inner ring of the impeller to be communicated, an air inlet of the inner ring of the impeller is large in taper, negative pressure appears on the inner side of the impeller under the action of the taper and the vortex blades on the outer ring, and the long-distance vortex air gathering and supplying effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of fan blades, in particular to a vortex wind-gathering blade and a fan having the same. Background Art

[0002] At present, the fan blades are usually equipped with 3 / 5 / 7 large-blade fan blades on one impeller. Such blades generally have a large air volume, but the air blown out is not focused, the air supply distance is short, and the user experience is not good. In order to gather wind, the circulation fan structure generally adds a deeper air duct and replaces the blades with large twist angle blades for the fan to gather flow. In addition, the flow inside the fan impeller is usually three-dimensional and viscous. When the fluid flows through the impeller blades, various complex vortices will be generated inside the impeller. Various complex vortices will increase the energy consumption of the impeller rotation and seriously affect the efficiency of the fan. Summary of the invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a vortex wind-gathering blade and a fan having the same, in which the outer ring vortex blades rotate, and the middle position of the tapered inner ring is connected to create an intermediate negative pressure, thereby achieving a long-distance vortex wind gathering and air supply effect.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a vortex wind-focusing blade, including an impeller and blades, the blades are arranged on the outer peripheral surface of the impeller, the blades include a blade top, a blade bottom, a blade leading edge and a blade trailing edge, the blade top and the blade bottom are vortex-twisted towards each other to form a first curved surface portion and a second curved surface portion, the blade top and the blade bottom have a vortex angle, and there is a sharp angle between the blade leading edge and the blade bottom, the blade is connected to the impeller through the blade trailing edge, and the blade trailing edge extends along the air outlet of the impeller conical surface to the air inlet of the impeller conical surface.

[0005] As a further improvement of the present invention: the impeller is configured to be a cone with concave side surfaces, and both end surfaces of the impeller are connected to form an air duct with a conical surface, and the air duct of the impeller is configured from large to small from the air inlet end to the air outlet end.

[0006] As a further improvement of the present invention: the blades extend along the outer side of the impeller cone surface from the air outlet vortex of the impeller cone surface to the air inlet of the impeller cone surface, and the blades extend outwardly from the air inlet end surface of the impeller cone surface to have an air inlet portion.

[0007] As a further improvement of the present invention: the first curved surface portion is an arc surface convex from the back side of the windward surface to the front side of the windward surface on the upper side of the wind blade, and the second curved surface portion is an arc surface convex from the front side of the windward surface to the back side of the windward surface on the lower side of the wind blade.

[0008] As a further improvement of the present invention: the blade top has a first meridian d1 along the impeller axis direction, the blade bottom has a second meridian d2 along the impeller axis direction, the first meridian d1 and the second meridian d2 have a vortex angle α along the impeller axis direction, and the vortex angle 40≤α≤65°.

[0009] As a further improvement of the present invention: the air inlet portion extends outward from the air inlet end surface of the impeller conical surface to form a sharp angle, the sharp angle is the angle β between the leading edge of the blade and the bottom of the blade, and the angle is 30°≤β≤75°.

[0010] As a further improvement of the present invention: a transition camber surface is provided along the first curved surface portion in the vortex torsion, and the minimum camber radius of the transition camber surface is 15 mm.

[0011] As a further improvement of the present invention: before the vortex twisting of the blade, the center points of the two end planes of the top and bottom of the blade are connected to form a connecting line d3;

[0012] After the blade is twisted by the vortex, the center points of the two end planes connecting the top and bottom of the blade form the center line d4 of the blade cross section;

[0013] There is a concave depth h1 at the concave surface of the second curved portion between the connecting line d3 and the center line d4 of the blade cross section. The concave depth h1 is 0.5-3 times the thickness L of the blade.

[0014] As a further improvement of the present invention: a hub is provided at the air outlet end of the impeller, the impeller and the hub are connected by a twig, the radius of the air outlet end of the impeller is r1, the outer ring radius of the hub is r2, and the difference between the air outlet end radius r1 of the impeller and the outer ring radius r2 of the hub is greater than 2 mm.

[0015] On the other hand, the present invention also provides a fan comprising the vortex wind-focusing blades described in any one of the aforementioned embodiments.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention rotates the vortex blades on the outer ring of the impeller, and the vortex blades drive the wind forward, cooperate with the middle position of the inner ring of the impeller to make a connection, and the air inlet of the inner ring of the impeller is set with a large taper. Under the action of the taper and the outer ring vortex blades, the vortex blades on the outer side of the impeller drive the wind flow rate to be larger when rotating, while the wind flow rate on the inner side of the impeller is smaller, so that negative pressure appears on the inner side of the impeller. The wind blown out by the rotating vortex blades will drive the wind on the inner side of the impeller, thereby realizing the effect of long-distance vortex wind gathering and air supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution, the drawings required for use in the implementation will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Figure 1 It is a schematic diagram of the perspective structure of the fan blade of the present invention from top view.

[0020] Figure 2 It is a schematic diagram of the side perspective structure of the fan blade of the present invention.

[0021] Figure 3 It is a perspective schematic diagram of the assembly of the blades and the impeller of the present invention.

[0022] Figure 4 It is a schematic diagram of the structure of the blade of the present invention.

[0023] Figure 5 It is a schematic diagram of the curved surface structure of the blade of the present invention.

[0024] Figure 6 It is a schematic diagram of the curved surface sharp corner structure of the blade of the present invention.

[0025] Figure 7 It is a schematic structural diagram of the center lines at both ends of the blade of the present invention.

[0026] Figure 8 It is a schematic diagram of the top view of the center line of the two ends of the blade of the present invention.

[0027] Fig. 9 It is a schematic structural diagram of the angles at both ends of the blade of the present invention.

[0028] Fig.10 It is a schematic structural diagram of the assembly of the hub and the impeller of the present invention.

[0029] Fig.11 It is a side perspective structural schematic diagram of the fan of the present invention.

[0030] Fig.12 It is a front structural schematic diagram of the fan of the present invention.

[0031] Figure numerals: 1. impeller, 2. fan blade, 21. blade top, 22. blade bottom, 23. blade trailing edge, 24. blade leading edge, 25. air inlet, 3. hub, 11. first curved surface portion, 12. second curved surface portion. DETAILED DESCRIPTION

[0032] In order to enable a clear and complete understanding of the technical solution, the present invention is further described in conjunction with the embodiments and drawings. Obviously, the described embodiments are only some embodiments of the present invention, and all other embodiments obtained by technicians in the relevant field without making creative work are within the scope of protection of the present invention.

[0033] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0034] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0035] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0036] An embodiment of the present invention provides a vortex wind-focusing blade, including an impeller 1 and blades, wherein the blades are arranged on the outer peripheral surface of the impeller 1, and the blades include a blade top 21, a blade bottom 22, a blade leading edge 24 and a blade trailing edge 23. The blade top 21 and the blade bottom 22 are vortex-twisted toward each other to form a first curved surface portion 11 and a second curved surface portion 12, the blade top 21 and the blade bottom 22 have a vortex angle, and there is a sharp angle between the blade leading edge 24 and the blade bottom 22. The blade is connected to the impeller 1 through the blade trailing edge 23, and the blade trailing edge 23 extends along the air outlet of the conical surface of the impeller 1 to the air inlet of the conical surface of the impeller 1.

[0037] One way to use the vortex wind-gathering blade 2 of the present application is on a fan that blows air into a plastic bag. The fan needs to have a good wind-gathering ability. By utilizing the wind-gathering ability of the fan, the plastic bag is kept at a certain distance from the fan, and the fan blows air into the plastic bag. Compared with blowing directly through the mouth, it is easier to fill the plastic bag with gas.

[0038] In this embodiment, the impeller 1 is configured to be a cone with concave side surfaces, and both end surfaces of the impeller 1 are connected to form an air duct with a conical surface. The air duct of the impeller 1 is configured from large to small from the air inlet end to the air outlet end. By setting the impeller 1 to be conical in shape, a large-tapered air duct is made on the inner side of the air inlet end of the impeller 1, and the large opening taper at the air inlet end of the impeller 1 gradually decreases to the small taper at the air outlet end of the impeller 1, and the air inlet capacity of the air duct gradually decreases, thereby forming gas compression. In conjunction with the vortex wind-gathering blades 2 on the outer side of the impeller 1, the vortex blades on the outer side of the impeller 1 drive a larger wind flow rate when rotating, while the wind flow rate on the inner side of the impeller 1 is smaller, so that negative pressure appears on the inner side of the impeller 1, and the wind blown out by the rotating vortex blades will drive the wind on the inner side of the impeller 1, thereby achieving a long-distance vortex wind-gathering air supply effect, and driven by the high-speed wind on the outer side of the impeller 1, the wind flow rate near the air outlet end of the impeller 1 will be greater than the wind flow rate at the air inlet end of the impeller 1, and the pressure at the air outlet end of the impeller 1 will be less than the pressure at the air inlet end of the impeller 1, which will prompt more wind from the air inlet end of the impeller 1 to flow to the air outlet end of the impeller 1, thereby increasing the air volume.

[0039] Furthermore, the blades extend from the air outlet vortex of the impeller 1 conical surface to the air inlet of the impeller 1 conical surface along the outer side of the impeller 1 conical surface, and the blades have an air inlet portion extending outwardly from the air inlet end surface of the impeller 1 conical surface. Furthermore, the first curved surface portion 11 is an arc surface convex from the back of the windward surface to the front of the windward surface on the upper side of the fan blade 2, and the second curved surface portion 12 is an arc surface convex from the front of the windward surface to the back of the windward surface on the lower side of the fan blade 2. The wind body is cut by the air inlet portion of the air inlet end of the impeller 1 extending out of the blade, so that when the blade rotates with the impeller 1, the airflow passing through the air inlet position of the bottom 22 of the blade first flows to the second curved surface portion 12, and flows along the extension direction of the arc surface of the second curved surface portion 12, and flows to the first curved surface portion 11 of the other blade to gather wind. Since the second curved surface portion 12 between the two blades is wide, and the first curved surface portion 11 between the two blades is narrower than the position of the second curved surface portion 12 between the two blades, after the air inlet portion of the air inlet end of the impeller 1 extending out of the blade cuts the wind body, a vortex is formed on the second curved surface portion 12, and the vortex will draw more air into the second curved surface portion 12, and the curved surface stroke of the second curved surface portion 12 is short. After the air forms a vortex on the second curved surface portion 12, it is quickly eliminated in the first curved surface portion 11 of the other blade, thereby reducing the existence time of the vortex on the blade, the vortex intensity is small, and the noise generated by the elimination of the vortex by the first curved surface portion 11 is reduced.

[0040] In this embodiment, the blade top 21 has a first meridian d1 along the axis of the impeller 1, and the blade bottom 22 has a second meridian d2 along the axis of the impeller 1. The first meridian d1 and the second meridian d2 have a vortex angle α along the axis of the impeller 1, and the vortex angle is 40≤α≤65°. By adjusting the angle between the blade top 21 and the blade bottom 22, the backflow and vortex phenomenon of the airflow between the blades can be reduced, and the energy loss can be reduced, thereby improving the air volume efficiency of the fan; a larger vortex angle can usually produce a larger air volume, but it may also increase noise and energy consumption. There is a balance point between air volume and noise. An excessively large blade angle usually produces a larger wind pressure, and the air volume will be relatively reduced; when the vortex angle is 40≤α≤65°, when a large air volume is required, a blade with a larger vortex angle can be selected, and when low-noise operation is required, a blade with a smaller vortex angle can be selected. The vortex angle is 40≤α≤65°. In the present application, a second curved portion 12 is designed at the rear end of the air inlet portion of the blade. After the wind enters the blade, it passes through the second curved portion 12. The inclination angle of the second curved portion 12 with the air inlet portion is small, and the surface pressure on the second curved portion 12 is small, which reduces the backflow phenomenon and enhances the wind gathering performance of the fan blade 2.

[0041] In this embodiment, the air inlet portion extends outward from the air inlet end face of the conical surface of the impeller 1 to form a sharp angle, and the sharp angle is the angle β between the leading edge 24 of the blade and the bottom 22 of the blade, and the angle is 30°≤β≤75°. By setting a sharp angle at the air inlet end of the blade, the sharp angle shape helps to reduce the friction between the blade and the air, thereby reducing the generation of turbulence. The airflow guidance at the sharp angle of the blade can reduce the backflow and vortex phenomenon of the airflow between the blades, reduce the noise generated by the turbulent airflow, further improve the performance of the fan, and can also reduce the airflow resistance. By reducing the airflow resistance, the fan can generate a larger air volume while consuming the same power, and it also helps to increase the wind pressure of the fan, thereby generating a larger air volume at the same speed.

[0042] In this embodiment, a transition arc surface is provided along the first curved surface portion 11 in the vortex torsion, and the minimum arc radius of the transition arc surface is 15 mm.

[0043] In this embodiment, before the vortex twisting of the blade, the center points of the two end planes of the blade top 21 and the blade bottom 22 of the blade are connected to form a connecting line d3;

[0044] After the blade is twisted by the vortex, the center points of the two end planes connecting the top 21 and the bottom 22 of the blade form the center line d4 of the blade cross section;

[0045] There is a concave depth h1 at the concave surface of the second curved portion 12 between the connecting line d3 and the center line d4 of the blade cross section. The concave depth h1 is 0.5-3 times the thickness L of the blade.

[0046] The windward surface of a single blade is concave by 0.5 to 3 times the thickness of the blade, which can better bear the rotating air supply volume and achieve a better air supply effect. At the same time, the first curved portion 11 of the blade is curved, and the minimum radius of the arc angle of the first curved portion 11 is 15mm, which ensures smooth air flow at the starting point of the blade and reduces air supply resistance.

[0047] In this embodiment, the air outlet end of the impeller 1 is provided with a hub 3, and the impeller 1 and the hub 3 are connected by a bramble. The air outlet radius of the impeller 1 is r1, and the outer ring radius of the hub 3 is r2. The difference between the air outlet radius r1 of the impeller 1 and the outer ring radius r2 of the hub 3 is greater than 2mm. After the middle inner ring hub 3 is connected to the impeller 1 by a bramble, a hollow connection is made between the hub 3 and the impeller 1, and the hollow gap needs to be greater than 2mm to ensure that the impeller 1 introduces air with a large taper, and an outer ring vortex is formed under the drive of the outer turbofan blades 2, and the middle culvert air supply structure realizes the air supply and wind gathering function.

[0048] On the other hand, the present invention also provides a fan, including the vortex wind-gathering blades described in any one of the above embodiments. This embodiment has an internal and external laminated, integrated design, with a large taper structure added in the middle, and a mesh cover and the wind duct are installed on the outer ring of the blade to achieve double-layer wind guidance, wind volume gathering, and improved air supply efficiency.

[0049] In this embodiment, the vortex blades on the outer ring of the impeller 1 rotate, and the vortex blades drive the wind forward, cooperate with the middle position of the inner ring of the impeller 1 to make a connection, and the air inlet of the inner ring of the impeller 1 is set with a large taper. Under the action of the taper and the outer ring vortex blades, the vortex blades on the outer side of the impeller 1 drive the wind flow rate to be larger when rotating, while the wind flow rate on the inner side of the impeller 1 is smaller, so that negative pressure appears on the inner side of the impeller 1, and the wind blown out by the rotating vortex blades will drive the wind on the inner side of the impeller 1, so as to achieve the effect of long-distance vortex wind gathering and air supply.

[0050] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the present invention without creative mental work, which all fall within the scope of protection of the present invention.

Claims

1. A vortex wind-gathering blade, comprising an impeller and blades, wherein the blades are arranged on the outer peripheral surface of the impeller, and the blades include a blade top, a blade bottom, a blade leading edge and a blade trailing edge, characterized in that: The top and bottom of the blade are vortex-twisted toward each other to form a first curved surface portion and a second curved surface portion, the top and bottom of the blade have a vortex angle, a sharp angle is provided between the leading edge of the blade and the bottom of the blade, the blade is connected to the impeller via the trailing edge of the blade, and the trailing edge of the blade extends along the air outlet of the impeller conical surface to the air inlet of the impeller conical surface.

2. The vortex wind-gathering blade according to claim 1, characterized in that: The impeller is configured to be a conical shape with a concave side surface. Both end surfaces of the impeller are connected to form an air duct with a conical surface. The air duct of the impeller is configured from large to small from the air inlet end to the air outlet end.

3. The vortex wind-gathering blade according to claim 2, characterized in that: The blades extend along the outer side of the impeller conical surface from the air outlet vortex of the impeller conical surface to the air inlet of the impeller conical surface, and the blades extend outwardly from the air inlet end surface of the impeller conical surface to have an air inlet portion.

4. The vortex wind-concentrating blade according to claim 1, characterized in that: The first curved surface portion is an arc surface convex from the back side of the windward surface to the front side of the windward surface on the upper side of the fan blade, and the second curved surface portion is an arc surface convex from the front side of the windward surface to the back side of the windward surface on the lower side of the fan blade.

5. The vortex wind-gathering blade according to claim 1, characterized in that: The blade top has a first meridian d1 along the impeller axis, the blade bottom has a second meridian d2 along the impeller axis, the first meridian d1 and the second meridian d2 have a vortex angle α along the impeller axis, and the vortex angle 40≤α≤65°.

6. The vortex wind-gathering blade according to claim 3, characterized in that: The air inlet portion extends outward from the air inlet end surface of the impeller conical surface to form a sharp angle, and the sharp angle is the angle β between the leading edge of the blade and the bottom of the blade, and the angle is 30°≤β≤75°.

7. The vortex wind-concentrating blade according to claim 4, characterized in that: A transition camber surface is provided along the first curved surface portion in the vortex torsion, and the minimum camber radius of the transition camber surface is 15 mm.

8. The vortex wind-gathering blade according to claim 7, characterized in that: Before the vortex twisting of the blade, the center points of the two end planes of the top and bottom of the blade are connected to form a connecting line d3; After the blade is twisted by the vortex, the center points of the two end planes connecting the top and bottom of the blade form the center line d4 of the blade cross section; There is a concave depth h1 at the concave surface of the second curved portion between the connecting line d3 and the center line d4 of the blade cross section. The concave depth h1 is 0.5-3 times the thickness L of the blade.

9. The vortex wind-gathering blade according to claim 3, characterized in that: The air outlet end of the impeller is provided with a hub, and the impeller and the hub are connected by a bramble. The air outlet end radius of the impeller is r1, and the outer ring radius of the hub is r2. The difference between the air outlet end radius r1 of the impeller and the outer ring radius r2 of the hub is greater than 2mm.

10. A fan, characterized in that: It comprises the vortex wind-gathering blade as described in any one of claims 1 to 9.

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