vanes

Abstract

The application provides a blade, a plurality of blades can form an impeller, the blade has a first control surface, a second control surface and at least one third control surface, the first control surface is located at a first end of the blade, the second control surface is located at a second end of the blade, and the at least one third control surface is located between the first control surface and the second control surface; wherein the first control surface, the second control surface and the at least one third control surface are all transverse sections, the area of the at least one third control surface is greater than the area of the first control surface and less than the area of the second control surface, a first section of the blade is formed between the first control surface and the at least one third control surface, a second section of the blade is formed between the second control surface and the at least one third control surface, and the trend of the outer surface of the first section of the blade is different from the trend of the outer surface of the second section of the blade. The blade in the application can improve the performance of the impeller.

Description

TECHNICAL FIELD

[0001] The present application relates to a blade, especially a blade applied to a centrifugal fan. BACKGROUND

[0002] A centrifugal fan includes an impeller and a housing, the impeller is driven by a motor and can rotate in the housing so that energy can be converted between shaft power and fluid medium. The impeller of the fan has a plurality of circumferentially arranged blades, each blade is generally strip-shaped and has a suction surface and a pressure surface. The shape and arrangement of the blade have certain influence on the performance and noise of the fan. SUMMARY

[0003] The present application provides a blade, a plurality of the blades can form an impeller, the blade extends along a length direction, in the length direction of the blade, the blade has a first end and a second end, the blade further has a first control surface, a second control surface and at least one third control surface, the first control surface is located at the first end of the blade, the second control surface is located at the second end of the blade, and the at least one third control surface is located between the first control surface and the second control surface, wherein the first control surface, the second control surface and the at least one third control surface are all transverse sections, the area of the at least one third control surface is greater than the area of the first control surface and less than the area of the second control surface, a first segment of the blade is formed between the first control surface and the at least one third control surface, a second segment of the blade is formed between the second control surface and the at least one third control surface, and the trend of the outer surface of the first segment of the blade is different from the trend of the outer surface of the second segment of the blade.

[0004] The blade as described above, the first control surface, the at least one third control surface and the second control surface are uniformly distributed in the length direction of the blade.

[0005] The blade as described above, the at least one third control surface includes one third control surface, and the one third control surface is located at the midpoint in the length direction of the blade.

[0006] The blade as described above, the area of the third control surface is less than the average of the areas of the first control surface and the second control surface.

[0007] The blade as described above, each of the first control surface, the second control surface and the at least one third control surface has a thickness direction, the difference between the thickness of the first end of the third control surface and the thickness of the first end of the first control surface is less than the difference between the thickness of the first end of the third control surface and the thickness of the first end of the second control surface.

[0008] The blade as described above, each of the first control surface, the second control surface and the at least one third control surface has a width direction, along the width direction, each control surface has a first control point, a second control point, a third control point and a fourth control point, wherein the first control point and the fourth control point are located at both ends of the width direction respectively, the second control point is located at the thickest part of the thickness direction, and the third control point is located between the second control point and the fourth control point.

[0009] The blade as described above, the first control point, the second control point, the third control point are on a first circular arc, and the third control point and the fourth control point are on a second circular arc, wherein the diameter of the first circular arc is smaller than the diameter of the second circular arc.

[0010] The blade as described above, the thickness of each control surface at the first control point is greater than the thickness at the fourth control point.

[0011] The blade as described above, the blade forms a blade projection surface on a meridian plane of the impeller, the blade projection surface comprises a first side edge, a second side edge, an inlet edge and an outlet edge, wherein the first side edge and the second side edge are oppositely arranged, the inlet edge and the outlet edge are oppositely arranged and connected with the first side edge and the second side edge, the length of the first side edge is greater than the length of the second side edge, the outlet edge is a circular arc, and the center of the circular arc intersects with the extension line of the second side edge.

[0012] The application further provides a centrifugal fan, comprising a shell and an impeller, wherein the impeller is located in the shell, and the impeller is formed by a plurality of blades as described above arranged in a circumferential direction.

[0013] The blade in the application is long strip-shaped, has a plurality of control surfaces in the length direction, so that the variation trend of the outer contour of the blade in the length direction is different.

[0014] The blade in the application has at least three control surfaces, so as to form at least two segments with different variation trends. Each control surface has four control points. The shape design of the blade in the application can improve the performance of the impeller. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1A is a perspective view of the fan in the application;

[0016] Figure 1B is Figure 1A is an exploded view of the fan in the application;

[0017] Figure 2A is Figure 1B is a side view of the main body of the fan in the application;

[0018] Figure 2Bis Figure 1B a side view of the impeller;

[0019] Figure 3 is Figure 2B an exploded view of the impeller;

[0020] Figure 4A is Figure 3 a perspective view of the first blade set;

[0021] Figure 4B is Figure 4A a perspective view of the first blade set as seen in the axial direction;

[0022] Figure 5 is a perspective view of one blade in Fig. 4;

[0023] Figure 6A is Figure 5 a schematic view of the shape of the first control surface of the blade;

[0024] Figure 6B is Figure 5 a schematic view of the shape of the third control surface of the blade;

[0025] Figure 6C is Figure 5 a schematic view of the shape of the second control surface of the blade;

[0026] Figure 7 is Figure 5 a schematic view of the blade projection plane formed by the blade in the meridian plane of the impeller. DETAILED DESCRIPTION

[0027] Various specific embodiments of the present application will be described below with reference to the accompanying drawings, which are incorporated in, and form a part of, this specification. It should be understood that, although terms are used in this application in describing the various example structural parts and elements of the present application, such as "front", "back", "up", "down", "left", "right", "top", "bottom", etc., these terms are used only for the purpose of convenience in describing the various example embodiments of the present application, and are determined based on the example orientation shown in the drawings. Since the embodiments disclosed in this application can be arranged in different directions, these terms indicating directions are only for the purpose of illustration and should not be considered as limiting. Where possible, the same or similar reference numerals are used in this application to refer to the same or similar parts.

[0028] Figure 1A is a perspective view of a fan of the present application, Figure 1B is Figure 1A an exploded view of the fan, Figure 1A and Figure 1B shows the structure of the fan.

[0029] As Figure 1Aand Figure 1B As shown in FIG. 1, the blower 100 includes a driving device 101 and a blower body 102. The blower body 102 includes a housing 111 and an impeller 112, which is disposed in the housing 111. The driving device 101 includes a motor 108 having a driving shaft 109, which is connected to the impeller 112 of the blower body 102, and the driving shaft 109 is rotatable to drive the impeller 112 to rotate. The rotation of the impeller 112 can introduce gas into the housing 111 and discharge from a gas outlet of the housing 111. The blower 100 can change the flow direction and pressure of the gas flow.

[0030] Figure 2A is Figure 1B a side view of the blower body 102, Figure 2B is Figure 1B a side view of the impeller, Figure 2A and Figure 2B shows the structure of the blower body.

[0031] As shown in FIG. 1, the blower 100 includes a driving device 101 and a blower body 102. The blower body 102 includes a housing 111 and an impeller 112, which is disposed in the housing 111. The driving device 101 includes a motor 108 having a driving shaft 109, which is connected to the impeller 112 of the blower body 102, and the driving shaft 109 is rotatable to drive the impeller 112 to rotate. The rotation of the impeller 112 can introduce gas into the housing 111 and discharge from a gas outlet of the housing 111. The blower 100 can change the flow direction and pressure of the gas flow. Figure 2A and Figure 2B As shown in FIG. 1, the blower 100 includes a driving device 101 and a blower body 102. The blower body 102 includes a housing 111 and an impeller 112, which is disposed in the housing 111. The driving device 101 includes a motor 108 having a driving shaft 109, which is connected to the impeller 112 of the blower body 102, and the driving shaft 109 is rotatable to drive the impeller 112 to rotate. The rotation of the impeller 112 can introduce gas into the housing 111 and discharge from a gas outlet of the housing 111. The blower 100 can change the flow direction and pressure of the gas flow.

[0032] The impeller 112 is mounted in the impeller mounting passage 215, and the impeller 112 can be driven by the driving device 101 to rotate relative to the housing 111 to guide the fluid to flow from the fluid passage inlet 261 into the fluid passage and out of the fluid passage outlet 262.

[0033] Figure 3 is Figure 2B an exploded view of the impeller, asFigure 3 As shown, the impeller 112 is generally cylindrical and includes a first blade group 301, a support portion 302, and a second blade group 303. The first blade group 301 and the second blade group 303 are respectively connected to the two sides of the support portion 302.

[0034] The support portion 302 includes a support plate 321 and a central portion 322. The support plate 321 is a generally circular flat plate with a first side surface 331 and a second side surface 332. The central portion 322 protrudes from the support plate 321. The central portion 322 is used to connect with the drive shaft 109 of the motor, so that the drive shaft 109 can drive the support portion 302 to rotate. The first blade group 301 is connected to the first side surface 331 of the support plate 321, and the second blade group 303 is connected to the second side surface 332 of the support plate 321. The second blade group 303 has the same structure as the first blade group 301 and is symmetrically arranged with respect to the support portion 302. The structure of the blade group will be described below using the first blade group 301 as an example.

[0035] Figure 4A yes Figure 3 A three-dimensional view of the first blade group. Figure 4B yes Figure 4A A side view of the first blade group viewed along the axial direction. (See image below.) Figure 4A and Figure 4B As shown, the first blade group 301 includes multiple blades 450 and a connecting portion 460. The connecting portion 460 is generally annular. Each blade 450 is generally elongated, with its length direction aligned with the axial direction of the impeller 112. The multiple blades 450 are evenly arranged along the circumferential direction to form a cylindrical shape. The first ends 461 of the multiple blades 450 are connected by the connecting portion 460, and the second ends 462 are connected to the first side surface 331 of the support portion 302. The connecting portion 460 is connected to the outer side of the multiple blades 450. There is a gap between adjacent blades 450, allowing fluid to enter the fluid channel inlet 261 through the gap between adjacent blades 450.

[0036] Figure 5 This is a 3D view of one of the blades in Figure 4. (As shown...) Figure 5As shown, the blade 450 extends along a length direction, i.e. an axial direction of the impeller 112. In the length direction of the blade, the blade 450 has a first end 511 and a second end 512. The first end 511 is an end close to the connecting portion 460, and the second end 512 is an end close to the support portion 302. An end surface of the first end 511 and an end surface of the second end 512 extend perpendicularly to the length direction of the blade 450. The end surface of the first end 511 forms a first control surface 521, and the end surface of the second end 512 forms a second control surface 522. The blade 450 further includes a third control surface 523, which is a cross section at a midpoint of the length direction of the blade 450. The first control surface 521, the second control surface 522 and the third control surface 523 are parallel to each other. The first control surface 521 and the third control surface 523 form a first blade segment 541, an outer surface of the first blade segment 541 smoothly transitions from the first control surface 521 to the third control surface 523, and the second control surface 522 and the third control surface 523 form a second blade segment 542, an outer surface of the second blade segment 542 smoothly transitions from the second control surface 522 to the third control surface 523. The areas of the first control surface 521, the third control surface 523 and the second control surface 522 increase in turn, but the area of the third control surface 523 is less than an average of the areas of the first control surface 521 and the second control surface 522, i.e. the areas of the first control surface 521, the third control surface 523 and the second control surface 522 do not increase uniformly. Thus, a variation trend of the outer surface of the first blade segment 541 is different from a variation trend of the outer surface of the second blade segment 542. That is, in the length direction of the blade 450, an extension direction of the outer surface of the first blade segment 541 is different from an extension direction of the outer surface of the second blade segment 542. Generally, the cross section of the blade 450 gradually increases from the first control surface 521 to the second control surface 522, and a variation speed of the cross section of the first blade segment 541 is less than a variation speed of the cross section of the second blade segment 542.

[0037] Figure 6A is Figure 5 a schematic view of a shape of a first control surface of a blade, Figure 6B is Figure 5 a schematic view of a shape of a third control surface of a blade, Figure 6C is Figure 5 a schematic view of a shape of a second control surface of a blade.

[0038] As Figure 6A shown, each of the first control surface 521, the third control surface 523 and the second control surface 522 is generally curved and has a width direction W and a thickness direction T.

[0039] As Figure 6AAs shown, along the width direction W, the first control surface 521 has a first end 611 and a second end 612, the first end 611 is located at the inner side of the impeller 112, and the second end 612 is located at the outer side of the impeller 112. That is, the first end 611 is an end located upstream in the flow direction of the gas, and the second end 612 is an end located downstream in the flow direction of the gas. From the direction of the first end 611 and the second end 612, the thickness of the first control surface 521 first increases and then decreases. The first end 611 and the second end 612 also have a first control point 601, a second control point 602, a third control point 603, and a fourth control point 604, wherein the first control point 601 is located at the first end 611, the fourth control point 604 is located at the second end 612, the second control point 602 is located at the thickest in the thickness direction, and the third control point 603 is located between the second control point 602 and the fourth control point 604. The first control point 601, the second control point 602, and the third control point 603 are on a first circular arc, the third control point 603 and the fourth control point 604 are on a second circular arc, the diameter of the first circular arc A11 is smaller than the diameter of the second circular arc A12. The sum of the lengths of the first circular arc A11 and the second circular arc A12 is L1. The second end 612 has an outlet edge 618, the outlet edge 618 intersects the second circular arc A12 at a P1 point, and an outlet angle β1 is formed between the tangent of the second circular arc A12 at the P1 point and the outlet edge 618.

[0040] Similarly, as shown, Figure 6B As shown, along the width direction W, the third control surface 523 has a first end 631 and a second end 632, the first end 631 is located at the inner side of the impeller 112, and the second end 632 is located at the outer side of the impeller 112. That is, the first end 631 is an end located upstream in the flow direction of the gas, and the second end 632 is an end located downstream in the flow direction of the gas. From the direction of the first end 631 and the second end 632, the thickness of the third control surface 523 first increases and then decreases. The first end 631 and the second end 632 also have a first control point 671, a second control point 672, a third control point 673, and a fourth control point 674, wherein the first control point 671 is located at the first end 631, the fourth control point 674 is located at the second end 632, the second control point 672 is located at the thickest in the thickness direction, and the third control point 673 is located between the second control point 672 and the fourth control point 674. The first control point 671, the second control point 672, and the third control point 673 are on a first circular arc, the third control point 673 and the fourth control point 674 are on a second circular arc, the diameter of the first circular arc A31 is smaller than the diameter of the second circular arc A32. The sum of the lengths of the first circular arc A31 and the second circular arc A32 is L3. The second end 632 has an outlet edge 638, the outlet edge 638 intersects the second circular arc A32 at a P3 point, and an outlet angle β3 is formed between the tangent of the second circular arc A32 at the P3 point and the outlet edge 638.

[0041] Similarly, such as Figure 6C As shown, along the width direction W, the second control surface 522 has a first end 621 and a second end 622. The first end 621 is located inside the impeller 112, and the second end 622 is located outside the impeller 112. That is, the first end 621 is the upstream end in the gas flow direction, and the second end 622 is the downstream end in the gas flow direction. From the direction of the first end 621 and the second end 622, the thickness of the third control surface 523 first increases and then decreases. The first end 621 and the second end 622 also have a first control point 651, a second control point 652, a third control point 653, and a fourth control point 654, wherein the first control point 651 is located at the first end 621, the fourth control point 654 is located at the second end 622, the second control point 652 is located at the thickest point in the thickness direction, and the third control point 653 is located between the second control point 652 and the fourth control point 654. The first control point 651, the second control point 652, and the third control point 653 are on the first arc, and the third control point 653 and the fourth control point 654 are on the second arc. The diameter of the first arc A21 is smaller than the diameter of the second arc A22. The sum of the lengths of the first arc A21 and the second arc A22 is L2. The second end 622 has an exit edge 628, which intersects the second arc A22 at point P2. The tangent of the second arc A22 at point P2 forms an exit angle β2 with the exit edge 628.

[0042] The difference between the thickness of the first end 631 of the third control surface 523 and the thickness at the corresponding position of the first end 611 of the first control surface is smaller than the difference between the thickness of the first end 631 of the third control surface 523 and the thickness at the corresponding position of the first end 621 of the second control surface 522.

[0043] In one embodiment of this application, the impeller outlet diameter is R. The diameter range of the first arc A11 of the first control surface 521 is (0.063-0.078)R, and the diameter range of the second arc A12 is (0.142-0.175)R. In the thickness direction, the thickness range at the first control point 601 is 1mm-1.2mm, the thickness range at the second control point 602 is 1.35mm-1.62mm and is located at (0.24-0.35)L1, the thickness range at the third control point 603 is 1.02mm-1.24mm, and the thickness range at the fourth control point 604 is 0.7mm-0.85mm. The outlet angle β1 ranges from 30° to 34°.

[0044] The diameter of the first circular arc A31 of the third control surface 523 ranges from (0.089-0.096)R, and the diameter of the second circular arc A32 ranges from (0.178-0.192)R. In the thickness direction of the third control surface 523, the thickness at the first control point 671 ranges from 1.4mm-1.65mm, the thickness at the second control point 672 ranges from 1.73mm-1.94mm and is located at (0.27-0.4)L2, the thickness at the third control point 673 ranges from 1.38mm-1.48mm, and the thickness at the fourth control point 674 ranges from 0.9-1.05. The angle of the outlet angle β3 ranges from 35°-40°.

[0045] The diameter of the first circular arc A21 of the second control surface 522 ranges from (0.089-0.096)R, and the diameter of the second circular arc A22 ranges from (0.143-0.165)R. In the thickness direction, the thickness at the first control point 601 ranges from 1.2mm-1.4mm, the thickness at the second control point 602 ranges from 1.52mm-1.70mm and is located at (0.31-0.45)L1, the thickness at the third control point 603 ranges from 1.13mm-1.36mm and is located at (0.55-0.65)L1, and the thickness at the fourth control point 604 ranges from 1.1-1.25. The angle of the outlet angle β1 ranges from 33°-37°.

[0046] Figure 7 is Figure 5 A schematic view of a blade projection plane formed by the blades in the impeller on the meridian plane of the impeller. As shown in Figure 7 , the blade projection plane includes a first side edge 711, a second side edge 712, an inlet edge 713 and an outlet edge 714, wherein the first side edge 711 and the second side edge 712 are oppositely arranged, the inlet edge 713 and the outlet edge 714 are oppositely arranged and connected with the first side edge 711 and the second side edge 712, the length of the first side edge 711 is greater than the length of the second side edge 712, the outlet edge 714 is a circular arc, and the center of the outlet edge 714 intersects with the extension line of the second side edge 712.

[0047] The blade in the present application has at least three control surfaces, thereby forming at least two segments with different variation trends. Each control surface has four control points. The shape design of the blade in the present application can improve the performance of the impeller. In one practical example of the present application, compared with the impeller composed of the regular blade with the same outer surface variation trend, the static pressure of the impeller using the blade of the present application can be improved from 51 Pa to 66 Pa, i.e. an increase of 15 Pa, under the same air volume and the same rotating speed, the efficiency can be improved from 38.9% to 44.9%, i.e. a total increase of 6%. Switching to the same flow rate, the rotating speed can be reduced by 50 revolutions under the static pressure condition, thereby reducing the power consumption of the motor by 7.2%, reducing the noise value and improving the noise level of the fan. The use of the blade of the present application can reduce the maximum speed inside the impeller, the flow state inside the impeller is improved, especially near the pressure surface and the outlet edge of the impeller, and the internal backflow is reduced.

[0048] While the present disclosure has been described in connection with the examples of the embodiments outlined above, it will be evident to those skilled in the art that various alternatives, modifications, variations, improvements, and / or substantial equivalents, whether known or not, can be used to practice the present disclosure. Additionally, the technical effects and / or technical problems described in this specification are exemplary and not limiting; therefore, the disclosure in this specification can be used to solve other technical problems and have other technical effects. Accordingly, the examples of the embodiments of the present disclosure as set forth above are intended to be illustrative not limiting. Various changes can be made without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure is intended to include all known or earlier developed alternatives, modifications, variations, improvements, and / or substantial equivalents.

Claims

1. A blade, a plurality of said blades being capable of forming an impeller, said blade extending along a length direction, in the length direction of the blade, the blade (450) having a first end (511) and a second end (512), characterized in that The blade (450) has: a first control surface (521) located at a first end of the blade; a second control surface (522) located at a second end of the blade; at least one third control surface (523) located between the first control surface (521) and the second control surface (522); wherein the first control surface (521), the second control surface (522) and the at least one third control surface (523) are all transverse sections, the area of the at least one third control surface (523) is greater than the area of the first control surface (521) and less than the area of the second control surface (522), a blade first section (541) is formed between the first control surface (521) and the at least one third control surface (523), a blade second section (542) is formed between the second control surface (522) and the at least one third control surface (523), and the trend of the outer surface of the blade first section (541) is different from the trend of the outer surface of the blade second section (542), wherein the at least one third control surface (523) comprises one third control surface, and the one third control surface (523) is located at the midpoint of the length direction of the blade, wherein the area of the third control surface (523) is less than the average of the areas of the first control surface (521) and the second control surface (522), and wherein each of the first control surface (521), the second control surface (522) and the at least one third control surface (523) has a thickness direction (T), and the difference between the thickness of the first end (631) of the third control surface (523) and the thickness of the first end (611) of the first control surface is less than the difference between the thickness of the first end (631) of the third control surface (523) and the thickness of the first end (621) of the second control surface (522).

2. The blade of claim 1, wherein: each of the first control surface (521), the second control surface (522) and the at least one third control surface (523) has a width direction (W), and along the width direction, each control surface has a first control point (601), a second control point (602), a third control point (603) and a fourth control point (604), wherein the first control point (601) and the fourth control point (604) are located at both ends of the width direction respectively, the second control point (602) is located at the thickest part of the thickness direction, and the third control point (603) is located between the second control point (602) and the fourth control point (604).

3. The blade of claim 2, wherein: The first control point (601), the second control point (602) and the third control point (603) are on a first circular arc, and the third control point (603) and the fourth control point (604) are on a second circular arc, wherein the diameter of the first circular arc is smaller than the diameter of the second circular arc.

4. The blade of claim 3, wherein: The thickness of each control surface at the first control point (601) is greater than the thickness at the fourth control point (604).

5. The blade of claim 1, wherein: The blade forms a blade projection plane on a meridian plane of the impeller, and the blade projection plane comprises a first side edge (711), a second side edge (712), an inlet edge (713) and an outlet edge (714), wherein the first side edge (711) and the second side edge (712) are oppositely arranged, the inlet edge (713) and the outlet edge (714) are oppositely arranged and connected with the first side edge (711) and the second side edge (712), the length of the first side edge (711) is greater than the length of the second side edge (712), the outlet edge (714) is in the shape of a circular arc, and the center of the circular arc of the outlet edge (714) intersects with the extension line of the second side edge (712).

6. A centrifugal fan characterized by The impeller (112) is arranged in the shell (111) and formed by a plurality of blades according to any one of claims 1-5 arranged in a circumferential direction. The impeller (112) is arranged in the shell (111) and formed by a plurality of blades according to any one of claims 1-5 arranged in a circumferential direction. ​

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