Axial flow fan and wind wheel thereof

Abstract

The utility model discloses an axial flow fan and a wind wheel thereof, the wind wheel comprises a wind wheel body, the wind wheel body comprises a hub and a plurality of blades respectively installed on the peripheral wall of the hub; the blades are provided with balance clamp installation positions and are distributed close to the hub, the distance from the center of each balance clamp installation position to the central axis of the hub is a first correction radius R1, on the basis, the balance clamp installation positions of the blades are distributed close to the outer edges of the blades, and the distance from the center of each balance clamp installation position to the central axis of the hub is a second correction radius R2; the second correction radius R2 is larger than the first correction radius R1. According to the wind wheel provided by the scheme, the mounting positions of the balance clamps of the blades are distributed close to the outer edges of the blades, namely the mounting positions of the balance clamps of the blades are distributed away from the center of a rotating shaft of the axial flow fan, so that the correction radius of a rotor of the wind wheel is increased, the dynamic balance difficulty of the wind wheel is reduced, and the weight of weighted balance is reduced; and meanwhile, the dynamic balance efficiency of the wind wheel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flow fans, in particular to an axial flow fan and a wind wheel thereof. Background Art

[0002] The axial flow fan consists of a wind wheel and a motor. The wind wheel consists of a hub and multiple blades installed on the hub. In order to achieve dynamic balance adjustment of the wind wheel, Figure 1 As shown, the blades of the existing wind wheel have a position for installing a balancing clip, but the installation position of the balancing clip is relatively close to the center of the rotating shaft of the axial flow fan, that is, the distance from the center position of the installation position of the balancing clip to the center of the rotating shaft of the axial flow fan (that is, the correction radius) is small, which makes it difficult to perform dynamic balancing of the wind wheel. The number of balancing clips added is large, and the weight of the balancing is large. In addition, although increasing the speed of the axial flow fan can increase the air volume and pressure, this will be limited by noise and blade strength. Utility Model Content

[0003] In view of this, the utility model provides a wind wheel, in which the installation position of the balance clamp of the blade is distributed away from the center of the rotating shaft of the axial flow fan, so that the rotor correction radius of the wind wheel is increased, thereby helping to reduce the difficulty of dynamic balancing of the wind wheel and reduce the weight of the added balance.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A wind wheel, used in an axial flow fan, includes a wind wheel body, the wind wheel body including: a hub and a plurality of blades respectively mounted on the outer peripheral wall of the hub; wherein the blades are mounted on the outer peripheral wall of the hub at a first mounting angle β1, the blades have a balancing clamp mounting position and are distributed close to the hub, and the distance from the center of the balancing clamp mounting position to the central axis of the hub is a first correction radius R1.

[0006] The installation position of the balance clamp of the blade is distributed close to the outer edge of the blade, and the distance from the center of the installation position of the balance clamp to the central axis of the hub is the second correction radius R2, and the second correction radius R2 is greater than the first correction radius R1.

[0007] Preferably, the second correction radius R2 is greater than or equal to 0.45 times the diameter of the wind rotor body and less than or equal to 0.48 times the diameter of the wind rotor body.

[0008] Preferably, the thickness of the second side edge of the blade is less than the thickness of the first side edge and is equal to or less than the clamping thickness of the balancing clamp;

[0009] The balancing clamp installation positions include: a first balancing clamp installation position and a second balancing clamp installation position;

[0010] The first balancing clip installation position is located at the first side edge of the blade. A balancing clip installation groove is provided at the portion of the blade where the first balancing clip installation position is located on the front side of the blade, so that the thickness from the bottom of the balancing clip installation groove to the back side of the blade is equal to the thickness of the second side edge. A first backstab clamping structure is provided at the bottom of the balancing clip installation groove for cooperating with the backstab of the balancing clip.

[0011] The second balancing clip installation position is located at the second side edge of the blade. The second balancing clip installation position is located on the front of the blade and is provided with a second backstab clamping structure for cooperating with the backstab of the balancing clip, and is spaced apart from the second side edge.

[0012] Preferably, the first backstab clamping structure includes a first backstab clamping groove;

[0013] The second backstab clamping structure includes a second backstab clamping groove.

[0014] Preferably, the first back-stab snap-in groove is a strip-shaped snap-in groove, and its distribution direction is parallel to the first side edge;

[0015] The second back-stab snap-in groove is a strip-shaped snap-in groove, and its distribution direction is parallel to the second side edge.

[0016] Preferably, the blade is mounted on the outer peripheral wall of the hub at a second mounting angle β2, and the second mounting angle β2 is greater than the first mounting angle β1.

[0017] Preferably, the second installation angle β2 is 40° to 45°.

[0018] An axial flow fan comprises a wind wheel, wherein the wind wheel is the wind wheel described above.

[0019] It can be seen from the above technical solution that the wind wheel provided by the utility model distributes the installation position of the balance clamp of each blade close to the outer edge of the blade, that is, the installation position of the balance clamp of the blade is distributed away from the center of the rotating shaft of the axial flow fan, so that the rotor correction radius of the wind wheel is increased, thereby helping to reduce the difficulty of dynamic balancing of the wind wheel, reduce the weight of the added balance, and also help to improve the dynamic balancing efficiency of the wind wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a structural front view of an existing wind wheel;

[0022] Figure 2 for Figure 1 AA section view;

[0023] Figure 3 A front view of the structure of the wind wheel provided in an embodiment of the utility model;

[0024] Figure 4 for Figure 3 BB cross-sectional view;

[0025] Figure 5 A structural side view of an axial flow fan provided by an embodiment of the present utility model;

[0026] Figure 6 A structural side view of another axial flow fan provided by an embodiment of the present utility model;

[0027] Figure 7 A front view of the structure of another axial flow fan provided by an embodiment of the present utility model;

[0028] Figure 8 The flow coefficient-pressure coefficient comparison curve of the existing wind wheel and the wind wheel of this invention is shown in FIG.

[0029] Figure 9 It is the PQ comparison curve of the existing wind wheel and the wind wheel of this invention.

[0030] Among them, 1 is the wind wheel, 11 is the hub, 12 is the blade, 121 is the balance clamp installation position, 122 is the balance clamp installation slot, 123 is the first backstab clamping slot, and 124 is the second backstab clamping slot; 2 is the motor; 3 is the mesh cover. DETAILED DESCRIPTION

[0031] The utility model discloses a wind wheel, in which the balancing clip installation position 121 of the blade 12 is distributed away from the center of the rotating shaft of the axial flow fan, so as to increase the dynamic balancing correction radius of the wind wheel, thereby effectively solving the dynamic balancing bottleneck problem of the wind wheel.

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] The wind wheel provided in the embodiment of the present invention is applied to an axial flow fan, and includes a wind wheel body, such as Figure 1As shown, the wind wheel body includes: a hub 11 and a plurality of blades 12 respectively mounted on the outer peripheral wall of the hub 11; Figure 2 As shown, the blade 12 is mounted on the outer peripheral wall of the hub 11 at a first mounting angle β1, as shown in FIG. Figure 1 As shown, the blade 12 has a balancing clamp installation position 121 and is distributed close to the hub 11. The distance from the center of the balancing clamp installation position 121 to the central axis of the hub 11 is a first correction radius R1.

[0034] On this basis, this solution improves the wind wheel, among which, Figure 3 As shown, the balancing clamp installation position 121 of the blade 12 is distributed close to the outer edge of the blade 12, and the distance from the center of the balancing clamp installation position 121 to the central axis of the hub 11 is the second correction radius R2, which is greater than the first correction radius R1.

[0035] It should be noted that, in the existing wind wheel, each blade 12 is mounted on the outer peripheral wall of the hub 11 at a first mounting angle β1 (e.g. Figure 2 As shown), the balance clamp installation position 121 of each blade 12 is distributed close to the hub 11 (as shown Figure 1 As shown), the distance from the center of the blade 12 balance clamp installation position 121 to the central axis of the hub 11 (i.e., the first correction radius R1) is also correspondingly smaller;

[0036] In the wind wheel provided by this solution, the balancing clamp installation position 121 of each blade 12 is distributed close to the outer edge of the blade 12 (such as Figure 3 As shown), that is, it is distributed away from the hub 11, so that the balancing clamp installation position 121 of each blade 12 in the axial flow fan is distributed away from the center of the axial flow fan's rotating shaft, and the distance from the center of the blade balancing clamp installation position 121 to the central axis of the hub 11 is increased, that is, the distance from the center of the blade balancing clamp installation position 121 to the center of the axial flow fan's rotating shaft (that is, the second correction radius R2) is increased, which helps to reduce the difficulty of dynamic balancing of the wind wheel, reduce the weight of the added balance, and is also beneficial to improving the dynamic balancing efficiency of the wind wheel.

[0037] That is to say, the wind wheel provided by this solution distributes the balancing clamp installation position 121 of each blade 12 close to the outer edge of the blade 12, that is, the balancing clamp installation position 121 of the blade 12 is distributed away from the center of the rotating shaft of the axial flow fan, so that the rotor correction radius of the wind wheel is increased, thereby helping to reduce the difficulty of dynamic balancing of the wind wheel, reduce the weight of the added balance, and also help to improve the dynamic balancing efficiency of the wind wheel.

[0038] In this solution, to better achieve dynamic balancing of the wind rotor, the second correction radius R2 is preferably greater than or equal to 0.45 times the diameter of the wind rotor body and less than or equal to 0.48 times the diameter of the wind rotor body. In other words, the optimal rotor correction radius of this wind rotor is between 0.45 and 0.48 of the diameter D of the wind rotor body.

[0039] In addition, it should be noted that the simplified calculation formula for the residual unbalance is: m = 9549MG / r×n;

[0040] Where M is the rotor mass (in kg);

[0041] G is the balancing accuracy grade;

[0042] n is the working speed of the workpiece (in rpm);

[0043] m is the residual unbalance (in g);

[0044] r is the rotor correction radius (in mm);

[0045] The second correction radius R2 of the wind rotor can be 1.5 times the first correction radius R1 of the existing wind rotor. For example, the first correction radius R1 of the existing wind rotor is 120 mm, and the second correction radius R2 of the wind rotor is 180 mm. The balancing accuracy level is G2.5, and the rotor mass is 1.46 kg. Accordingly, the residual unbalance of the existing wind rotor is m1=9549MG / R1×n=9549*1.46*2.5 / 120*1400=0.207g, and the residual unbalance of the wind rotor is m2=9549MG / R2×n=9549*1.46*2.5 / 180*1400=0.138g.

[0046] That is to say, under the above working conditions, the existing wind wheel needs to add a 0.207g balance clamp to meet the G2.5 balance accuracy level requirement, while the present wind wheel only needs to add a 0.138g balance clamp to meet the G2.5 balance accuracy level requirement.

[0047] Specifically, the thickness of the second side edge of the blade 12 is less than the thickness of the first side edge and is equal to or less than the clamping thickness of the balancing clamp; wherein, Figure 3 As shown, the first side edge of the blade 12 is the side edge pointed by the arrow on the blade 12, the second side edge is the side edge not pointed by the shear head, and the outer edge of the blade 12 is the end of the blade 12 away from the hub 11, that is, the blade 12 has three edges; preferably, the thickness of the second side edge of the blade 12 can be equal to the clamping thickness of the balancing clamp, of course, the balancing clamp has a back thorn;

[0048] The balancing clamp installation positions include: a first balancing clamp installation position and a second balancing clamp installation position;

[0049] The first balancing clip installation position is located at the first side edge of the blade 12, wherein the first balancing clip installation position is actually located at the portion of the first side edge of the blade 12 close to the outer edge. The first balancing clip installation position is distributed on both the front and back sides of the portion of the first side edge of the blade 12, such as Figure 3 As shown, a balancing clip installation groove 122 is provided at the portion of the first balancing clip installation position 121 located on the front face of the blade 12, so that the thickness from the bottom of the balancing clip installation groove 122 to the back face of the blade 12 is equal to the thickness of the second side edge, that is, the material thickness matches the thickness to be clamped by the balancing clip, thereby facilitating the balancing clip to be clamped in the first balancing clip installation position neither loose nor tight. A first back stab engaging structure for cooperating with the back stab of the balancing clip is provided at the bottom of the balancing clip installation groove 122, so that the balancing clip can be locked after being clamped in the balancing clip installation groove 122, thereby preventing the balancing clip from being detached from the balancing clip installation groove 122.

[0050] The second balancing clip installation position is located at the second side edge of the blade 12, wherein the second balancing clip installation position is actually located at the portion of the second side edge of the blade 12 close to the outer edge. The second balancing clip installation position is distributed on both the front and back sides of the portion of the second side edge of the blade 12, such as Figure 3 As shown, the second balancing clip installation position is located on the front side of the blade 12 and is provided with a second back stab clamping structure for cooperating with the back stab of the balancing clip, and is spaced apart from the second side edge so that the balancing clip can be locked after being clamped at the second balancing clip installation position to prevent the balancing clip from detaching at the second balancing clip installation position; in this way, the balancing clip is also firmly clamped at the balancing clip installation position.

[0051] Further, if Figure 3 As shown, the first backstab clamping structure includes a first backstab clamping groove 123;

[0052] The second backstab engaging structure includes a second backstab engaging groove 124. When the balancing clip is mounted in the first balancing clip mounting position 122 or the second balancing clip mounting position on the blade 12, the backstab of the balancing clip engages within the backstab engaging groove and abuts against a sidewall of the backstab engaging groove, thereby achieving engagement between the backstab of the balancing clip and the backstab engaging groove. In other words, the backstab engaging structure at the balancing clip mounting position of the blade 12 of this embodiment utilizes a backstab engaging groove, resulting in a simple structure and convenient engagement.

[0053] Furthermore, if Figure 3 As shown, the first back-stab engaging groove 123 is a strip-shaped engaging groove, and its distribution direction is parallel to the first side edge;

[0054] The second back-stab engaging grooves 124 are strip-shaped engaging grooves and are distributed in a direction parallel to the second side edge. This facilitates the engagement of the back-stabs of multiple balancing clips at the first balancing clip installation position or the second balancing clip installation position of the blade 12, that is, facilitates the clamping and fastening of multiple balancing clips at the first balancing clip installation position or the second balancing clip installation position of the blade 12, and further facilitates the clamping and fastening of multiple balancing clips according to the situation, thereby facilitating better dynamic balancing adjustment of the wind rotor.

[0055] In this program, if Figure 4 As shown, the blades 12 are installed on the outer peripheral wall of the hub 11 at a second installation angle β2, and the second installation angle β2 is greater than the first installation angle β1. In the wind wheel provided by this solution, each blade 12 is installed on the outer peripheral wall of the hub 11 at a second installation angle β2, and the second installation angle β2 is greater than the existing installation angle of the blade 12, that is, the installation angle of the blade 12 is increased. In this way, under the same rotation speed, it helps to increase the air volume and pressure of the axial flow fan and avoid the limitation of noise and blade strength due to the increase of the rotating shaft. In other words, in the wind wheel provided by this solution, the installation angle of the blades 12 is increased, so that the fan can obtain higher air volume and pressure under the same conditions and rotation speed. Figure 8 As shown, the flow coefficient ψ and pressure coefficient Ψ of this wind wheel are higher than those of the existing wind wheel.

[0056] Specifically, in order to enable the fan to obtain a higher air volume and pressure under the same conditions and speed, the second installation angle β2 is preferably 40° to 45°. In other words, the optimal installation angle of each blade 12 of the wind wheel is 40° to 45°.

[0057] In addition, if the first installation angle β1 of the blades of the existing wind wheel is 35°, and the second installation angle β2 of the blades of the present wind wheel is 41°, and it is assumed that the diameter of the wind wheel D is 0.4m and the rotation speed is 1400r / min, then the PQ (pressure-flow) curve comparison between the existing wind wheel and the present wind wheel is as follows: Figure 9 shown.

[0058] like Figure 5 and Figure 6 As shown, the embodiment of the present invention also provides an axial flow fan, including a wind wheel, and the wind wheel is the wind wheel described above. Since this solution adopts the above-mentioned wind wheel, it also has corresponding beneficial effects. For details, please refer to the previous description and will not be repeated here. In addition, as Figure 6 and Figure 7 As shown, the axial flow fan further includes a mesh cover 3 , which is arranged on the motor 2 and is used to cover part of the wind wheel 1 .

[0059] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0060] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wind wheel, used in an axial flow fan, comprising a wind wheel body, wherein the wind wheel body comprises: A hub (11) and a plurality of blades (12) respectively mounted on the outer peripheral wall of the hub (11); wherein the blades (12) are mounted on the outer peripheral wall of the hub (11) at a first mounting angle β1, the blades (12) have a balancing clamp mounting position (121) and are distributed close to the hub (11), and the distance from the center of the balancing clamp mounting position (121) to the central axis of the hub (11) is a first correction radius R1, characterized in that: The balancing clamp installation position (121) of the blade (12) is distributed close to the outer edge of the blade (12), and the distance from the center of the balancing clamp installation position (121) to the central axis of the hub (11) is a second correction radius R2, and the second correction radius R2 is greater than the first correction radius R1.

2. The wind wheel according to claim 1, characterized in that: The second correction radius R2 is greater than or equal to 0.45 times the diameter of the wind rotor body and less than or equal to 0.48 times the diameter of the wind rotor body.

3. The wind wheel according to claim 1, characterized in that: The thickness of the second side edge of the blade (12) is less than the thickness of the first side edge and is equal to or less than the clamping thickness of the balancing clamp; The balancing clamp installation positions include: a first balancing clamp installation position and a second balancing clamp installation position; The first balancing clip installation position is located at the first side edge of the blade (12); a balancing clip installation groove (122) is provided at the portion of the first balancing clip installation position located at the front of the blade (12), so that the thickness from the bottom of the balancing clip installation groove (122) to the back of the blade (12) is equal to the thickness of the second side edge; and a first back thorn clamping structure for cooperating with the back thorn of the balancing clip is provided at the bottom of the balancing clip installation groove (122); The second balancing clip installation position is located at the second side edge of the blade (12); the second balancing clip installation position is located at the front of the blade (12) and is provided with a second backstab clamping structure for cooperating with the backstab of the balancing clip, and is spaced apart from the second side edge.

4. The wind wheel according to claim 3, characterized in that: The first backstab clamping structure comprises a first backstab clamping groove (123); The second backstab clamping structure includes a second backstab clamping groove (124).

5. The wind wheel according to claim 4, characterized in that: The first back-stab snap-in groove (123) is a strip-shaped snap-in groove, and its distribution direction is parallel to the first side edge; The second back-stab snap-in groove (124) is a strip-shaped snap-in groove, and its distribution direction is parallel to the second side edge.

6. The wind wheel according to claim 1, characterized in that: The blade (12) is mounted on the outer peripheral wall of the hub (11) at a second mounting angle β2, and the second mounting angle β2 is greater than the first mounting angle β1.

7. The wind wheel according to claim 6, characterized in that: The second installation angle β2 is 40° to 45°.

8. An axial flow fan, comprising a wind wheel, characterized in that: The wind wheel is the wind wheel according to any one of claims 1 to 7.

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