A mixed flow impeller for a fan and a fan

Abstract

The utility model provides a kind of mixed flow impeller and fan for fan. Mixed flow impeller includes front disc, rear disc and multiple blades. The middle part of front disc is provided with air inlet. Rear disc is set to the rear side of front disc. Multiple blades are set between front disc and rear disc. Every blade includes first edge connected to front disc, second edge connected to rear disc, third edge connecting the outer end of first edge and the outer end of second edge, and fourth edge connecting the inner end of first edge and the inner end of second edge. The distance between the front end of third edge and the axis of air inlet is greater than the radius of rear disc, not only makes the contact area of blade front side and airflow larger, to make impeller can more effectively guide axial airflow to enter air duct at air inlet, also expand the air outlet between front disc and rear disc, and the air outlet is inclined to rear, to be more easily flowed from rear side along axial when airflow flows out from between front disc and rear disc under the guidance of blade, improve the air outlet efficiency of mixed flow fan.

Description

Technical Field

[0001] This utility model relates to the field of wind turbine technology, and in particular to a mixed-flow impeller and a wind turbine. Background Technology

[0002] Most existing centrifugal impellers are typically used in centrifugal fans with axial inlet and radial outlet. However, when applied to mixed-flow fans that require axial inlet and outlet, the airflow needs to be guided by an additional flow guide structure in conjunction with the impeller to change the flow direction and achieve axial outlet, resulting in lower outlet efficiency for the mixed-flow fan. Utility Model Content

[0003] In view of the above problems, this utility model is proposed to provide a mixed-flow impeller and a fan for a fan that overcomes or at least partially solves the above problems. It can solve the problem of low air outlet efficiency of the mixed-flow fan when the existing impeller is applied to the mixed-flow fan, and achieve the purpose of improving the air outlet efficiency of the mixed-flow fan.

[0004] Specifically, this utility model provides a mixed-flow impeller for a fan, comprising: The front plate has an air inlet in the middle.

[0005] The rear plate is located behind the front plate.

[0006] Multiple blades are disposed between the front disc and the rear disc. Each blade includes a first edge connected to the front disc, a second edge connected to the rear disc, a third edge connecting the outer ends of the first edge and the second edge, and a fourth edge connecting the inner ends of the first edge and the second edge.

[0007] The distance between the front end of the third edge and the axis of the air inlet is greater than the radius of the rear plate.

[0008] Optionally, the ratio of the radius of the rear disc to the distance between the front end of the third edge and the axis of the air inlet is 4 / 5 to 9 / 10.

[0009] Optionally, the ratio of the distance between the inner end of the first edge and the axis of the air inlet to the distance between the front end of the third edge and the axis of the air inlet is 11 / 20 to 13 / 20.

[0010] Optionally, the projection of each blade onto a reference plane perpendicular to the axis of the air inlet is a straight line.

[0011] The angle between the perpendicular line between the leading edge of the third edge of each blade and the axis of the air inlet and the blade is 30° to 40°.

[0012] Optionally, the front surface of the rear plate is a plane and perpendicular to the axis of the air inlet.

[0013] The ratio of the distance from the front end of the third edge to the front surface of the rear plate to the distance between the front end of the third edge and the axis of the air inlet is 1 / 10 to 3 / 10.

[0014] Optionally, the rear surface of the front disc is a gradually expanding surface that gradually increases in size along the front-rear direction.

[0015] The ratio of the distance from the front end of the fourth edge to the front surface of the rear plate to the distance between the front end of the third edge and the axis of the air inlet is 4 / 5 to 9 / 10.

[0016] Optionally, the rear end of the third edge is connected to the outer edge of the rear disc.

[0017] The front end of the third edge is connected to the outer edge of the front disc.

[0018] The inner end of the first edge is located at the edge of the air inlet.

[0019] The fourth edge is parallel to the axis of the air inlet.

[0020] The air inlet is equipped with a forward-extending air guide ring.

[0021] This utility model also provides a fan, including: Air duct.

[0022] The aforementioned mixing impeller is disposed within the air guide duct. The axis of the air inlet is coaxial with that of the air guide duct.

[0023] Optionally, the ratio of the distance between the front end of the third edge and the axis of the air inlet to the inner radius of the air guide tube is 3 / 4 to 4 / 5.

[0024] Optionally, the fan also includes: An air guide shroud is disposed at the front end of the air guide tube and configured to guide airflow into the air inlet.

[0025] A wind deflector ring is disposed on the inner wall of the air guide duct, and the outer edge of the front disc is located behind the wind deflector ring.

[0026] A wind deflector is disposed on the rear side of the rear plate, and the wind deflector is coaxial with the air guide.

[0027] Multiple partitions are evenly distributed between the air guide duct and the wind deflector.

[0028] In the mixed-flow impeller of this invention, since the third edge is the outer edge of the blade, the distance between the front end of the third edge and the axis of the air inlet is greater than the radius of the rear plate. This not only makes the contact area between the front side of the blade and the airflow larger, so that the impeller can more effectively guide the axial airflow into the air duct at the air inlet, but also expands the air outlet between the front plate and the rear plate. Moreover, the air outlet is tilted backward so that when the airflow flows out from between the front plate and the rear plate under the guidance of the blade, it is guided to the rear side, making it easier for the airflow to flow out from the rear side along the axial direction, thereby improving the air outlet efficiency of the mixed-flow fan.

[0029] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0030] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic structural diagram of a mixed-flow impeller according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of a fan according to an embodiment of the present utility model; Figure 3 This is a schematic exploded view of a fan according to an embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of a fan according to an embodiment of the present invention; Figure 5 This is a schematic cross-sectional view of a fan according to an embodiment of the present invention; Figure 6 This is a simulation diagram of the internal airflow of a fan according to an embodiment of the present invention.

[0031] List of reference numerals in the attached diagram: 100. Front panel; 110. Air intake; 200, Rear End; 300. Leaf blade; 400. Air guide ring; 500, air guide tube; 600, air guide cover; 700, wind deflector ring; 800, air deflector tube; 900, partition plate. Detailed Implementation

[0032] The following reference Figures 1 to 6This invention describes a mixed-flow impeller for a fan and a fan according to embodiments of the present invention. In this description, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0033] Unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," "fix," and "couple" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] Figure 1 This is a schematic structural diagram of a mixed-flow impeller according to an embodiment of the present invention, as shown below. Figure 1 As shown, and refer to Figures 2 to 6 This utility model provides a mixed-flow impeller for a fan. The mixed-flow impeller includes a front disc 100, a rear disc 200, and multiple blades 300.

[0037] An air inlet 110 is provided in the middle of the front disc 100. A rear disc 200 is located behind the front disc 100. Multiple blades 300 are disposed between the front disc 100 and the rear disc 200. Each blade 300 includes a first edge connected to the front disc 100, a second edge connected to the rear disc 200, a third edge connecting the outer ends of the first edge and the second edge, and a fourth edge connecting the inner ends of the first edge and the second edge. The distance R1 between the leading edge of the third edge and the axis of the air inlet 110 is greater than the radius R2 of the rear disc 200.

[0038] In this embodiment, the third edge is the outer edge of the blade 300. The distance R1 between the front end of the third edge and the axis of the air inlet 110 is greater than the radius R2 of the rear plate 200. That is, the distance R1 between the front end of the third edge and the axis of the air inlet 110 is greater than the distance between the rear end of the third edge and the axis of the air inlet 110. This not only makes the contact area between the front side of the blade 300 and the airflow larger, so that the impeller can more effectively guide the axial airflow into the air duct at the air inlet 110, but also expands the air outlet between the front plate 100 and the rear plate 200. The air outlet is tilted backward so that when the airflow flows out from between the front plate 100 and the rear plate 200 under the guidance of the blade 300, it is guided to the rear. In addition, the smaller diameter of the rear plate 200 also expands the flow space of the airflow, making it easier for the airflow to flow out from the rear along the axis, thus improving the air outlet efficiency of the mixed flow fan.

[0039] In some embodiments of this utility model, such as Figure 1 As shown, the ratio of the radius R2 of the rear plate 200 to the distance R1 between the front end of the third edge and the axis of the air inlet 110 is 4 / 5 to 9 / 10.

[0040] In this embodiment, when the ratio is less than 4 / 5, the problem of poor structural strength between the blade 300 and the front disc 100 due to excessive axial extension of the blade 300's front end compared to its rear end is avoided. When the ratio is greater than 9 / 10, the axial extension of the blade 300's front end compared to its rear end is insufficient, resulting in a weakened guiding effect on the airflow and limiting the air outlet efficiency. The ratio range of 4 / 5 to 9 / 10 ensures that the front side of the blade 300 has sufficient contact area with the airflow to improve airflow capture efficiency, while also ensuring the structural stability of the blade 300 under high-speed rotation of the mixed-flow impeller.

[0041] In some embodiments of this utility model, such as Figure 1 and Figure 5As shown, the ratio of the distance R3 between the inner end of the first edge and the axis of the air inlet 110 to the distance R1 between the front end of the third edge and the axis of the air inlet 110 is 11 / 20 to 13 / 20.

[0042] In this embodiment, when the ratio of the distance R3 between the inner end of the first edge and the axis of the air inlet 110 to the distance R1 between the front end of the third edge and the axis of the air inlet 110 is less than 11 / 20, the inner edge of the blade 300 is too close to the axis of the air inlet 110, resulting in a smaller air intake size of the air inlet 110, which increases the intake resistance and easily induces vortices. When the ratio is greater than 13 / 20, the inner edge of the blade 300 is too outward, resulting in a larger air intake size of the air inlet 110, which weakens the ability to guide the airflow in the area near the axis and reduces the air outlet efficiency of the mixed-flow fan.

[0043] In some embodiments of this utility model, such as Figure 5 As shown, the projection of each blade 300 onto a reference plane perpendicular to the axis of the air inlet 110 is a straight line, which facilitates the demolding process during the production and molding of the blade 300 and improves the manufacturing efficiency of the blade 300.

[0044] The angle β between the perpendicular line between the leading edge of the third edge of each blade 300 and the axis of the air inlet 110 and the blade 300 is 30° to 40°.

[0045] In this embodiment, when the angle β between the perpendicular line from the leading edge of the third edge of each blade 300 and the axis of the inlet 110 and the blade 300 is less than 30°, the blade 300 is too radially biased towards the inlet 110, weakening its axial airflow guiding capability. When the angle is greater than 40°, the blade 300 will bear greater bending stress during rotation, making it prone to deformation. An angle of 30° to 40° allows the blade 300 to effectively guide airflow axially while protecting it from excessive bending stress, thus improving its service life.

[0046] In some embodiments of this utility model, such as Figure 1 As shown, the front surface of the rear plate 200 is a plane and is perpendicular to the axis of the air inlet 110.

[0047] The ratio of the distance B from the front end of the third edge to the front surface of the rear plate 200 to the distance R1 between the front end of the third edge and the axis of the air inlet 110 is 1 / 10 to 3 / 10.

[0048] In this embodiment, when the ratio of the distance B from the front end of the third edge to the front surface of the rear plate 200 to the distance R1 between the front end of the third edge and the axis of the air inlet 110 is less than 1 / 10, the front end of the third edge is too close to the front surface of the rear plate, restricting the airflow space and increasing flow resistance. When the ratio is greater than 3 / 10, the front end of the third edge is too far from the front surface of the rear plate, making the blade 300 too long and reducing the stiffness of the blade 300. A ratio of 1 / 10 to 3 / 10 allows the airflow to flow smoothly between the front plate 100 and the rear plate 200, while ensuring the stiffness of the blade 300 through the support of the front and rear covers with appropriate distances.

[0049] In some embodiments of this utility model, such as Figure 1 and Figure 4 As shown, the rear surface of the front plate 100 is a gradually expanding surface that gradually increases in size along the front-to-back direction, which allows the airflow to smoothly diffuse radially after entering from the air inlet 110, effectively reducing energy loss at the air inlet 110.

[0050] The ratio of the distance H from the front end of the fourth edge to the front surface of the rear plate 200 to the distance R1 between the front end of the third edge and the axis of the air inlet 110 is 4 / 5 to 9 / 10.

[0051] In this embodiment, when the ratio of the distance H from the front end of the fourth edge to the front surface of the rear plate 200 to the distance R1 between the front end of the third edge and the axis of the air inlet 110 is less than 4 / 5, the front end of the fourth edge is too close to the front surface of the rear plate, restricting the flow space of the airflow and increasing the flow resistance. When the ratio is greater than 9 / 10, the front end of the fourth edge, that is, the inner edge of the blade 300, extends too far forward, resulting in a small taper of the tapered surface of the front plate 100. This makes the contact area between the front end of the blade 300 at the air inlet 110 and the airflow too small, reducing the guiding effect of the front plate 100 on the airflow.

[0052] In some embodiments of this utility model, such as Figure 4 As shown, the rear end of the third edge is connected to the outer edge of the rear disc 200. The front end of the third edge is connected to the outer edge of the front disc 100. The rear end of the third edge is directly connected to the outer edge of the rear disc 200, while the front end is connected to the outer edge of the front disc 100, in order to guide the airflow smoothly from between the front disc 100 and the rear disc 200.

[0053] like Figure 5As shown, the inner end of the first edge is located at the edge of the air inlet 110, which effectively avoids obstructing the airflow at the air inlet 110 and improves the guiding effect. The fourth edge is parallel to the axis of the air inlet 110. The fourth edge is designed to be parallel to the axis of the air inlet 110, so that the flow channel inside the blade 300 maintains a constant cross-section flow and reduces internal flow losses. A forward-extending guide ring 400 is provided at the air inlet 110 to guide the airflow axially into the impeller.

[0054] This utility model provides a fan. For example... Figure 3 and Figure 4 As shown, the fan includes an air guide duct 500 and a mixing impeller as described in any of the above embodiments. The mixing impeller is disposed within the air guide duct 500. The axis of the air inlet 110 is coaxial with that of the air guide duct 500.

[0055] In this embodiment, the mixed-flow impeller is placed inside the air guide duct 500, and the axis of the impeller's air inlet 110 is arranged coaxially with the axis of the air guide duct 500, which ensures a smooth transition of airflow from the air guide duct 500 inlet to the impeller air inlet 110, avoiding eddies and energy loss caused by the deflection of the airflow channel. The distance R1 between the front end of the third edge and the axis of the air inlet 110 is greater than the radius R2 of the rear plate 200. This not only makes the contact area between the front side of the blade 300 and the airflow larger, so that the impeller can more effectively guide the axial airflow into the air duct at the air inlet 110, but also expands the air outlet between the front plate 100 and the rear plate 200. The air outlet is tilted backward so that when the airflow flows out from between the front plate 100 and the rear plate 200 under the guidance of the blade 300, it is guided to the rear side. Furthermore, the smaller diameter of the rear plate 200 also expands the flow space of the airflow, making it easier for the airflow to flow out from the rear side axially, thus improving the air outlet efficiency of the mixed flow fan.

[0056] In some embodiments of this utility model, such as Figure 1 and Figure 4 As shown, the ratio of the distance R1 between the front end of the third edge and the axis of the air inlet 110 to the inner radius R4 of the air duct 500 is 3 / 4 to 4 / 5.

[0057] In this embodiment, when the ratio of the distance R1 between the front end of the third edge and the axis of the air inlet 110 to the inner radius R4 of the air guide duct 500 is less than 3 / 4, the third edge of the impeller is too close to the center of the air guide duct 500, resulting in insufficient impeller sweep area and limiting the air output efficiency of the mixed-flow fan. When the ratio is greater than 4 / 5, the third edge of the impeller is excessively close to the inner wall of the air guide duct 500, increasing the friction loss between the airflow and the inner wall surface, which can easily cause vortex noise. A ratio of 3 / 4 to 4 / 5 maximizes the use of the space inside the air guide duct 500 to increase the flow rate, while maintaining sufficient clearance between the blades 300 and the air guide duct 500 to reduce the friction between the airflow and the inner wall surface.

[0058] In some embodiments of this utility model, the ratio of the distance R1 between the front end of the third edge and the axis of the air inlet 110 to the inner radius R4 of the air guide duct 500 is preferably 0.77.

[0059] In some embodiments of this utility model, such as Figure 3 As shown, the fan also includes a wind guide shroud 600, a wind baffle ring 700, a wind baffle 800, and multiple partition plates 900.

[0060] In some embodiments of this utility model, such as Figure 3 As shown, the air guide shroud 600 is disposed at the front end of the air guide tube 500 and configured to guide the airflow into the air inlet 110. The air guide shroud 600 has a streamlined profile to effectively guide the external airflow smoothly into the impeller air inlet 110, reducing inlet turbulence and energy loss.

[0061] In some embodiments of this utility model, such as Figure 3 As shown, the wind deflector ring 700 is disposed on the inner wall of the air guide duct 500, and the outer edge of the front disc 100 is located behind the wind deflector ring 700. It is used to suppress the circumferential flow generated when the impeller rotates and improve the axial conveying efficiency of the airflow.

[0062] In some embodiments of this utility model, such as Figure 3 As shown, the wind deflector 800 is located on the rear side of the rear plate 200. The wind deflector 800 and the air guide 500 are coaxial to form a continuous flow channel structure, ensuring that the airflow can be orderly discharged after the impeller is accelerated, and avoiding pressure loss caused by sudden diffusion.

[0063] In some embodiments of this utility model, such as Figure 3 As shown, multiple partition plates 900 are evenly distributed between the air guide duct 500 and the wind deflector 800, which not only enhances the rigidity of the cylinder structure and suppresses operational vibration, but also divides the annular flow channel into multiple independent channels, further regulating the airflow direction and reducing the generation of eddies.

[0064] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A mixed-flow impeller for a fan, characterized in that, include: The front plate has an air inlet in the middle. The rear plate is located behind the front plate; Multiple blades are disposed between the front disc and the rear disc; each blade includes a first edge connected to the front disc, a second edge connected to the rear disc, a third edge connected to the outer end of the first edge and the outer end of the second edge, and a fourth edge connected to the inner end of the first edge and the inner end of the second edge. The distance between the front end of the third edge and the axis of the air inlet is greater than the radius of the rear plate.

2. The mixed-flow impeller according to claim 1, characterized in that, The ratio of the radius of the rear disc to the distance between the front end of the third edge and the axis of the air inlet is 4 / 5 to 9 / 10.

3. The mixed-flow impeller according to claim 1, characterized in that, The ratio of the distance between the inner end of the first edge and the axis of the air inlet to the distance between the front end of the third edge and the axis of the air inlet is 11 / 20 to 13 / 20.

4. The mixed-flow impeller according to claim 1, characterized in that, The projection of each blade onto a reference plane perpendicular to the axis of the air inlet is a straight line; The angle between the perpendicular line between the leading edge of the third edge of each blade and the axis of the air inlet and the blade is 30° to 40°.

5. The mixed-flow impeller according to claim 1, characterized in that, The front surface of the rear plate is a plane and is perpendicular to the axis of the air inlet; The ratio of the distance from the front end of the third edge to the front surface of the rear plate to the distance between the front end of the third edge and the axis of the air inlet is 1 / 10 to 3 / 10.

6. The mixed-flow impeller according to claim 5, characterized in that, The rear surface of the front disc is a gradually expanding surface that gradually increases in size along the front-rear direction. The ratio of the distance from the front end of the fourth edge to the front surface of the rear plate to the distance between the front end of the third edge and the axis of the air inlet is 4 / 5 to 9 / 10.

7. The mixed-flow impeller according to claim 1, characterized in that, The rear end of the third edge is connected to the outer edge of the rear disc; The front end of the third edge is connected to the outer edge of the front disc; The inner end of the first edge is located at the edge of the air inlet; The fourth edge is parallel to the axis of the air inlet; The air inlet is equipped with a forward-extending air guide ring.

8. A fan, characterized in that, include: Air duct; The mixing impeller as described in any one of claims 1 to 7, wherein the mixing impeller is disposed within the air guide tube; The axis of the air inlet is coaxial with that of the air guide tube.

9. The fan according to claim 8, characterized in that, The ratio of the distance between the front end of the third edge and the axis of the air inlet to the inner radius of the air guide tube is 3 / 4 to 4 / 5.

10. The fan according to claim 8, characterized in that, Also includes: An air guide shroud is disposed at the front end of the air guide tube and configured to guide airflow into the air inlet; A wind deflector ring is disposed on the inner wall of the air guide tube, and the outer edge of the front disc is located behind the wind deflector ring; A wind deflector is disposed on the rear side of the rear plate, and the wind deflector is coaxial with the air guide duct; Multiple partitions are evenly distributed between the air guide duct and the wind deflector.

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