Blade, impeller and fan

Abstract

The utility model discloses a blade, an impeller and a fan, and relates to the technical field of fresh air, the blade is provided with an inner edge and an outer edge which are both of a continuous arc-shaped structure, and the curvature radius of the middle of the inner edge and / or the outer edge is smaller than that of the two ends of the inner edge and / or the outer edge. The energy consumption in the working process of the impeller can be reduced, and the energy efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fresh air, in particular to a blade, an impeller and a fan. Background Art

[0002] In the prior art, plastic impellers are usually formed in one step by injection molding. The resulting impeller has good integrity and a smooth surface. However, the plastic impeller has poor strength and insufficient load capacity and cannot meet the working requirements of high speed and high load.

[0003] The rigid impeller has good aerodynamic characteristics, good strength and high rigidity, and is suitable for demanding working environments. The rigid impeller is usually composed of a cover plate and several impellers that are manufactured separately, but the impeller structure design in the prior art is not reasonable enough, which can easily lead to additional energy loss and affect the overall energy efficiency of the fan. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a blade, which can reduce energy consumption during the operation of the impeller and improve energy efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A blade comprises: the blade has an inner edge and an outer edge both of which are continuous arc structures, and the curvature radius of the inner edge and / or the middle part of the outer edge is smaller than the curvature radius of both ends thereof.

[0007] Compared with the prior art, the utility model has the following beneficial effects:

[0008] The inner edge of the blade has a variable radius of curvature, which can reduce the wind resistance of the impeller and reduce the energy loss during the operation of the impeller; and the curvature change of the outer edge of the blade can also play a better rectifying role, inhibit the generation of turbulence, and improve the flow quality of the airflow and the working stability of the impeller.

[0009] As a preferred solution, the minimum radius of curvature of the inner edge is greater than or equal to the minimum radius of curvature of the outer edge.

[0010] As a preferred solution, the inner edge and the outer edge have the same bending direction.

[0011] As a preferred embodiment, one side of the upper end of the blade close to the inner edge is bent toward the outer surface of the blade, and one side of the upper end of the blade close to the outer edge is bent toward the inner surface of the blade.

[0012] The utility model also proposes an impeller, which is equipped with any one of the blades described above, the upper end of the blade is inclined toward the edge of the impeller, and the outer surface of the blade has an inclination angle A with the radial reference surface of the impeller.

[0013] In addition to the beneficial effects of the above-mentioned blades, the impeller has a blade inclination angle design that expands the impeller's air intake range, can increase the air intake volume per unit time, and allows the airflow to transition smoothly, which can reduce the local resistance of the airflow at the structural connection, play a rectifying role, and further improve the working efficiency of the impeller.

[0014] As a preferred embodiment, the inclination angle A between the outer surface at the outer edge of the blade and the radial reference plane is greater than or equal to the inclination angle A between the outer surface at the inner edge of the blade and the radial reference plane.

[0015] As a preferred solution, the shell includes an upper cover and a lower cover, and the blades are installed between the upper cover and the lower cover.

[0016] As a preferred solution, the side wall of the lower cover forms an inclination angle B with the radial reference plane, and the inclination angle B gradually decreases from the center to the edge of the lower cover.

[0017] As a preferred solution, the upper cover comprises an arc-shaped extending main body, and an annular rectifying ring perpendicular to the radial reference plane is provided on the edge of the main body.

[0018] The utility model also provides a fan, comprising any of the blades described above, and / or any of the impellers described above.

[0019] The impeller of the fan has a simple manufacturing process, has a good energy efficiency ratio, and can work stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the overall structure of the impeller and the motor in the embodiment;

[0021] Figure 2 It is a schematic diagram of the structure of the blade and the lower cover;

[0022] Figure 3 is a side view of the lower cover;

[0023] Figure 4 is a side view of the upper cover;

[0024] Figure 5 This is a cross-sectional view of the impeller;

[0025] Figure 6 It is the side view of the impeller;

[0026] Figure 7 Schematic diagram of the blade structure.

[0027] In the above drawings:

[0028] 1. Impeller; 2. Blades; 201. Inner edge; 202. Outer edge; 3. Upper cover; 4. Lower cover; 5. Motor; 6. Air inlet; 7. Annular retaining ring; 8. Main body; 9. Rivets; 10. Reinforcement ribs. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments; the structures described in the various embodiments can be freely combined without any conflict in structure or principle.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] For ease of understanding, in the description of the present invention, the direction parallel to the rotation axis of the impeller 1 is defined as "axial", the direction perpendicular to the rotation axis of the impeller 1 is defined as "radial", and the direction around the rotation axis of the impeller 1 is defined as "circumferential".

[0033] The following is a description of some embodiments of the present invention in conjunction with the accompanying drawings:

[0034] like Figure 1 and Figure 7As shown, the utility model proposes a blade 2. In order to facilitate the understanding of the technical solution, the blade 2 is combined with the impeller 1 for explanation, wherein the impeller 1 includes a housing, which is specifically divided into an upper cover 3 and a lower cover 4, and the blade 2 is installed between the upper cover 3 and the lower cover 4; the impeller 1 is a circular structure as a whole and is driven by a motor 5. The center of the impeller 1 is the rotation axis, and the number of blades 2 is designed according to demand. In this embodiment, five curved blades 2 are taken as an example, as shown in FIG. Figure 2 As shown, five curved blades 2 are tilted and arranged clockwise or counterclockwise around the rotation axis of the impeller 1; each blade 2 extends from the center of the impeller 1 to the edge of the impeller 1 (that is, the air outlet direction). An air inlet 6 is provided at the center of the upper cover 3, and the air flow passes through the air inlet 6 from the axial direction into the impeller 1, and after being integrated and guided by the blades 2, the air is discharged from the radial direction.

[0035] To facilitate understanding of blade 2, the following definitions are made: the portion of blade 2 close to lower cover 4 is the lower end, the portion of blade 2 close to upper cover 3 is the upper end, the side of blade 2 close to the center of impeller 1 is the air inlet side, and the edge of the air inlet side is the inner edge 201; the side of blade 2 away from the center of impeller 1 is the air outlet side, and the edge of the air outlet side is the outer edge 202 of blade 2; the surface of blade 2 close to the center of impeller 1 is the inner surface, and the surface of blade 2 away from the center of impeller 1 is the outer surface.

[0036] like Figure 7 As shown, one side of the upper end of the blade 2 close to the inner edge 201 is bent toward the outer surface of the blade 2 (i.e., bent away from the center of the impeller 1), and one side of the upper end of the blade 2 close to the outer edge 202 is bent toward the inner surface of the blade 2 (i.e., bent toward the center of the impeller 1).

[0037] Such a design can expand the air flow path near the air inlet, play a good rectifying role at the airflow output end, and suppress the generation of turbulence; and the flow path of the airflow at the upper end of the blade 2 is gradually reduced, which increases the circulation speed of the airflow and increases the air volume and airflow quality per unit time; thereby reducing the energy consumption of the impeller 1 during operation and improving energy efficiency.

[0038] As a preferred solution, the blade 2 has an inner edge 201 and an outer edge 202 both of which are continuous arc structures, and the radius of curvature of the middle portion of the inner edge 201 is set to be smaller than the radius of curvature of the two ends thereof, and the radius of curvature of the middle portion of the outer edge 202 is set to be smaller than the radius of curvature of the two ends thereof. It should be understood that the middle portion mentioned above is only a general statement, and in fact the minimum radius of curvature may appear at any position of the inner edge 201 or the outer edge 202, as long as it conforms to the variation trend of the radius of curvature mentioned above.

[0039] For example, the radius of curvature of the inner edge 201 decreases gradually from bottom to top, reaches a minimum value when approaching the center point, and then gradually increases. The radius of curvature of the outer edge 202 increases gradually from bottom to top, increases to a maximum value when approaching the 1 / 4 point, then gradually decreases to a minimum value (roughly at the center point), then gradually increases, increases to a maximum value when approaching the 3 / 4 point, and then gradually decreases.

[0040] As a preferred solution, the minimum radius of curvature of the inner edge 201 is greater than or equal to the minimum radius of curvature of the outer edge 202 .

[0041] As a preferred solution, Figure 2 As shown, the bending directions of the inner edge 201 and the outer edge 202 are designed to be consistent.

[0042] In this way, the inner edge 201 of the blade 2 has a variable radius of curvature, which can reduce the wind resistance of the impeller 1 and reduce the energy loss during the operation of the impeller 1; and the curvature change of the outer edge 202 of the blade 2 can also play a better rectifying role, inhibit the generation of turbulence, and improve the flow quality of the airflow and the working stability of the impeller 1.

[0043] As a preferred solution, Figure 2 and Figure 7 As shown, the side of the lower end of the blade 2 close to the air inlet side and the side close to the air outlet side are bent toward the inner surface of the blade 2, forming an inward curved structure. It should be understood that although the lower end of the blade 2 is in a curved structure, the overall extension direction of the lower end of the blade 2 is still from the center of the impeller 1 to the edge of the impeller 1. When viewed from above the impeller 1, the edge of the lower end of the blade 2 close to the air outlet side is at most parallel to the edge of the lower cover 4, and should not gradually point to the inside of the impeller 1. This design can extend the flow path of the airflow, cooperate with the upper end of the blade 2, and improve the working efficiency of the impeller 1.

[0044] As a preferred solution, Figure 7 As shown, a plurality of reinforcing ribs 10 are evenly distributed on the surface of the blade 1, and the reinforcing ribs 10 protrude toward the outer surface of the blade 1 and extend laterally along the length direction of the blade 1. The reinforcing ribs 10 can change the geometric shape of the surface of the blade 1, thereby forming different stress distributions, reducing stress concentration, improving the overall strength of the blade 1, and delaying fatigue damage.

[0045] The utility model also provides an impeller 1, which is equipped with any one of the above-mentioned blades 2. In addition, if Figure 5 and Figure 6As shown, the upper end of the blade 2 is tilted toward the edge of the impeller 1 as a whole. The utility model refers to the plane passing through the rotation axis of the impeller 1 and extending radially as the "radial reference plane". The outer surface of the blade 2 has an inclination angle A with the radial reference plane; the inclination angle between the outer surface at the outer edge 202 of the blade 2 and the radial reference plane is greater than the inclination angle between the outer surface at the inner edge 201 of the blade 2 and the radial reference plane. Preferably, the size of the inclination angle A increases linearly during the extension of the blade 2 toward the edge. Furthermore, the range of the inclination angle A is 53 to 68 degrees.

[0046] In addition to the beneficial effects of the blades 2 mentioned above, the impeller 1 has a design of the inclination angle of the blades 2, which expands the air intake range of the impeller 1, can increase the air intake volume per unit time, and allows the airflow to transition smoothly, which can reduce the local resistance of the airflow at the structural connection, play a rectifying role, further improve the working efficiency of the impeller 1, and make the impeller 1 have a good energy efficiency ratio.

[0047] As a preferred solution, Figure 1 and Figure 2 As shown, the blades 2 are distributed on the upper surface of the lower cover 4. Specifically, the blades 2 separate from the center of the lower cover 4 to the edge of the impeller 1 and gradually extend along the outlet direction of the airflow. Figure 3 As shown, the top of the lower cover 4 is designed as an annular retaining ring 7, the outer wall of the annular retaining ring 7 extends obliquely downward to form the side wall of the lower cover 4, and the side wall is an arc surface; further, the side wall of the lower cover 4 is inclined at an angle B with the radial reference plane, and the inclination angle B is from the center of the lower cover 4 to the edge (i.e. Figure 3 It decreases gradually from top to bottom.

[0048] With such a design, the lower cover 4 of the impeller 1 can support the overall structure of the impeller 1, and can smoothly guide the air from the air inlet 6 to the inside of the impeller 1, thereby reducing the resistance during the air intake process and reducing the working energy consumption of the impeller 1. By changing the size of the inclination angle B, the flow path of the airflow can be extended, the air volume guided into the inside of the impeller 1 can be increased, and the energy efficiency ratio of the impeller 1 can be improved.

[0049] As a preferred solution, the inclination angle B is set to 22 to 27 degrees.

[0050] In addition, the lower cover 4 also serves to install a driving device such as a motor 5; for example, Figure 1 As shown, the center of the lower cover 4 is a hollow structure, and the annular retaining ring 7 is arranged around the hollow structure. The annular retaining ring 7 is provided with a plurality of through holes for connecting the driving device with the impeller 1, etc. The motor 5 can be an outer rotor motor 5, that is, the main shaft of the motor 5 does not rotate, the outer shell of the motor 5 rotates with the rotor, and the lower cover 4 is fixedly connected to the outer shell of the motor 5 and rotates with it. The motor 5 can also be an inner rotor motor 5, the main shaft of the motor 5 rotates with the rotor, and the lower cover 4 is fixedly connected to the main shaft of the motor 5.

[0051] As a preferred solution, Figure 1 and Figure 4 As shown, the upper cover 3 includes a main body 8 extending in an arc shape. An annular rectifying ring is provided at the bottom edge of the main body 8. Specifically, the lower edge of the main body 8 extends upward with a fixed radius of curvature to form an arc-shaped rectifying structure, and the edge of the rectifying structure extends upward perpendicularly to the radial reference plane to form an annular structure perpendicular to the radial reference plane. The annular structure and the rectifying structure are collectively referred to as an annular rectifying ring. The annular rectifying ring can be regarded as a transition area of ​​the airflow, guiding the flow of the airflow around the main body 8. In this way, the flow path of the airflow gradually increases and is evenly distributed when it is discharged, thereby suppressing the generation of vortices and turbulence.

[0052] According to this structure, the upper cover 3 of the impeller 1 and the lower cover 4 of the impeller 1 work together to support the overall structure of the impeller 1, avoiding adverse effects such as displacement and loosening of the blades 2. At the same time, the annular rectifying ring of the upper cover 3 can expand the flow path of the airflow, suppress the generation of turbulence, increase the air volume and improve the working stability of the impeller 1.

[0053] Furthermore, the top end of the upper cover 3 is provided with an air inlet retaining ring perpendicular to the radial reference plane. The retaining ring is formed separately or integrally with the main body 8 and is located around the air inlet 6 to guide the air inlet.

[0054] As a preferred solution, Figure 1 , Figure 6 and Figure 7 As shown, rivets 9 are provided at the upper and lower ends of the blade 2. The number of rivets 9 can be increased or decreased according to actual needs. The figure shows that a total of 6 rivets 9 are provided on a single blade 2. The side walls of the main body 8 and the lower cover 4 are provided with mounting holes matching the rivets 9. The rivets 9 on the blade 2 are inserted into the mounting holes and then riveted. The upper cover 3 and the lower cover 4 are connected into one piece by self-riveting of the blade 2. The manufacturing process is simple, and the blade 2 of the impeller 1 is stably installed at an angle, and the impeller 1 has good dynamic balance and concentricity, and can work stably for a long time.

[0055] The utility model also provides a fan, which includes any one of the above blades 2 and / or any one of the impellers 1. Thus, the impeller 1 of the fan has a simple manufacturing process, good energy efficiency ratio, and can work stably for a long time.

Claims

1. A blade, characterized in that: The blade (2) has an inner edge (201) and an outer edge (202) both of which are continuous arc-shaped structures, and the radius of curvature of the middle portion of the inner edge (201) and / or the outer edge (202) is smaller than the radius of curvature of both ends thereof.

2. A blade according to claim 1, characterized in that: The minimum radius of curvature of the inner edge (201) is greater than or equal to the minimum radius of curvature of the outer edge (202).

3. A blade according to claim 1, characterized in that: The inner edge (201) and the outer edge (202) have the same bending direction.

4. The blade according to any one of claims 1 to 3, characterized in that: A side of the upper end of the blade (2) close to the inner edge (201) is bent toward the outer surface of the blade (2), and a side of the upper end of the blade (2) close to the outer edge (202) is bent toward the inner surface of the blade (2).

5. An impeller, characterized in that: It comprises a housing and a blade as claimed in any one of claims 1 to 4 installed in the housing, wherein the upper end of the blade (2) is inclined toward the edge of the impeller (1), and the outer surface of the blade (2) has an inclination angle A with the radial reference surface of the impeller (1).

6. An impeller according to claim 5, characterized in that: The inclination angle A between the outer surface at the outer edge (202) of the blade (2) and the radial reference plane is greater than or equal to the inclination angle A between the outer surface at the inner edge (201) of the blade (2) and the radial reference plane.

7. An impeller according to claim 5 or 6, characterized in that: The shell comprises an upper cover (3) and a lower cover (4), and the blade (2) is installed between the upper cover (3) and the lower cover (4).

8. An impeller according to claim 7, characterized in that: The side wall of the lower cover (4) forms an inclination angle B with the radial reference plane, and the inclination angle B gradually decreases from the center of the lower cover (4) to the edge.

9. An impeller according to claim 7, characterized in that: The upper cover (3) comprises an arc-shaped extending main body (8), and the edge of the main body (8) is provided with an annular rectifying ring perpendicular to the radial reference plane.

10. A fan, characterized in that: It comprises the blade (2) according to any one of claims 1 to 4, and / or the impeller (1) according to any one of claims 5 to 9.

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