Fan impeller

Abstract

The utility model belongs to the technical field of fans, and particularly relates to a fan impeller. The fan impeller comprises an impeller cover, an impeller disc and a plurality of blades, the upper edges of the blades are fixedly connected with the impeller cover, the lower edges of the blades are fixedly connected with the impeller disc, the blades are evenly distributed in the circumferential direction of the impeller disc, the impeller cover comprises a front disc and a diffuser disc, and the molded line of the front disc is located in the area between a line a and a line b. The utility model has the advantages that the molded line of the front disc can enable the flow of gas to change slowly and be in smooth transition, the airflow is close to the inner wall of the front disc, the boundary layer is thin, airflow separation and eddy loss can be reduced, and the fan efficiency is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fans, and particularly relates to a fan impeller. Background Art

[0002] The impeller is a key component of a fan, and the quality of the impeller directly affects the performance of the fan. When the air flow passes through the wheel cover, it will be subject to frictional resistance and form resistance. The frictional resistance is generated by the viscosity of the fluid, and a very thin fluid layer with a large velocity gradient, that is, a boundary layer, is formed on the side close to the wheel cover. The form resistance refers to the separation of the boundary layer and the generation of eddy currents when the fluid bypasses an object, resulting in air flow loss.

[0003] Patent document [CN2018210633447] discloses a centrifugal wind wheel and its air flow guiding cover, including a wind wheel cover and a wind wheel disk arranged below the wind wheel cover. Wind wheel blades are arranged between the wind wheel cover and the wind wheel disk. A through hole is arranged in the middle of the wind wheel disk, and a rotor body is sleeved in the through hole. A wind flow guiding cover is sleeved on the rotor body, and the guiding cover body is fixedly installed on the wind wheel disk. The contour line intercepted on the outer peripheral wall of the guiding cover body by the plane of the axis of the guiding cover body is two symmetrically arranged curves. Eddy current loss will still occur during the use of this centrifugal wind wheel, and the efficiency of the fan needs to be further improved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a fan impeller with small resistance, less eddy current loss and high efficiency for the above problems.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions: This fan impeller includes a wheel cover, a wheel disk and a plurality of blades. The upper edge of the blade is fixedly connected to the wheel cover, and the lower edge of the blade is fixedly connected to the wheel disk. The blades are evenly distributed along the circumferential direction of the wheel disk. Its characteristic lies in that the wheel cover includes a front disk and a diffuser disk, and the profile line of the front disk is located in the area between line a and line b.

[0006] Line a includes successively connected arc segment 1, arc segment 2, arc segment 3, arc segment 4, and straight line segment 1. The inclination angle of the starting end of arc segment 1 is 92 degrees, the angle of arc segment 1 is 9 degrees, the ratio of the radius Ra1 of arc segment 1 to the diameter of the impeller is 0.2, the angle of arc segment 2 is 33 degrees, the ratio of the radius Ra2 of arc segment 2 to the diameter of the impeller is 0.086, the angle of arc segment 3 is 13 degrees, the ratio of the radius Ra3 of arc segment 3 to the diameter of the impeller is 0.083, the angle of arc segment 4 is 10 degrees, the ratio of the radius Ra4 of arc segment 4 to the diameter of the impeller is 0.17, and the inclination angle of straight line segment 1 is 156 degrees.

[0007] Line b includes successively connected straight line segment two, arc segment five, arc segment six, and straight line segment three. The inclination angle of straight line segment two is 107 degrees, the ratio of the height of straight line segment two to the impeller diameter is 0.033, the angle of arc segment five is 36 degrees, the ratio of the radius Rb1 of arc segment five to the impeller diameter is 0.076, the angle of arc segment six is 8 degrees, the ratio of the radius Rb2 of arc segment six to the impeller diameter is 0.096, and the inclination angle of straight line segment three is 156 degrees.

[0008] In the above-mentioned fan impeller, when the impeller diameter is 250 mm, the profile line of the front disc includes successively connected arc segment seven, arc segment eight, arc segment nine, arc segment ten, and straight line segment four. The starting-end inclination angle of arc segment seven is 94 - 96 degrees, the angle of arc segment seven is 15 - 17 degrees, the radius R2501 of arc segment seven is 37.5 - 39.5 mm, the angle of arc segment eight is 25 - 27 degrees, the radius R2502 of arc segment eight is 16.3 - 18.3 mm, the angle of arc segment nine is 5 - 7 degrees, the radius R2503 of arc segment nine is 51 - 53 mm, the angle of arc segment ten is 12 - 14 degrees, the radius R2504 of arc segment ten is 9 - 11 mm, the inclination angle of straight line segment four is 155 - 157 degrees, and the height of the hub cap is 29 - 31 mm.

[0009] In the above-mentioned fan impeller, the starting-end inclination angle of arc segment seven is 95 degrees, the angle of arc segment seven is 16 degrees, the radius R2501 of arc segment seven is 38.5 mm, the angle of arc segment eight is 26 degrees, the radius R2502 of arc segment eight is 17.3 mm, the angle of arc segment nine is 6 degrees, the radius R2503 of arc segment nine is 52 mm, the angle of arc segment ten is 13 degrees, the radius R2504 of arc segment ten is 10 mm, the inclination angle of straight line segment four is 156 degrees, and the height of the hub cap is 30 mm.

[0010] In the above-mentioned fan impeller, when the impeller diameter is 280 mm, the profile line of the front disc includes successively connected straight line segment five, arc segment eleven, arc segment twelve, and straight line segment six. The starting-end inclination angle of straight line segment five is 105 - 107 degrees, the height of straight line segment five is 9.3 - 10.3 mm, the angle of arc segment eleven is 27 - 29 degrees, the radius R2801 of arc segment eleven is 21 - 23 mm, the angle of arc segment twelve is 22 - 24 degrees, the radius R2802 of arc segment twelve is 21 - 23 mm, the inclination angle of straight line segment six is 155 - 157 degrees, the height of straight line segment six is 9 - 10 mm, and the height of the hub cap is 33 - 35 mm.

[0011] In the above-mentioned fan impeller, the inclination angle of straight line segment five is 106 degrees, the height of straight line segment five is 9.8 mm, the angle of arc segment eleven is 28 degrees, the radius R2801 of arc segment eleven is 22 mm, the angle of arc segment twelve is 23 degrees, the radius R2802 of arc segment twelve is 22 mm, the inclination angle of straight line segment six is 156 degrees, the height of straight line segment six is 9.5 mm, and the height of the wheel cover is 34 mm.

[0012] In the above-mentioned fan impeller, when the impeller diameter is 310 mm, the profile line of the front disc includes straight line segment seven, arc segment thirteen, arc segment fourteen and straight line segment eight connected in sequence. The inclination angle of straight line segment seven is 97 - 99 degrees, the height of straight line segment seven is 6.1 - 7.1 mm, the angle of arc segment thirteen is 22 - 24 degrees, the radius R3101 of arc segment thirteen is 22.6 - 24.6 mm, the angle of arc segment fourteen is 34 - 36 degrees, the radius R3102 of arc segment fourteen is 30.1 - 32.1 mm, the inclination angle of straight line segment eight is 156 - 158 degrees, the height of straight line segment eight is 4.4 - 5.4 mm, and the height of the wheel cover is 36.5 - 38.5 mm.

[0013] In the above-mentioned fan impeller, the inclination angle of straight line segment seven is 98 degrees, the height of straight line segment seven is 6.6 mm, the angle of arc segment thirteen is 23 degrees, the radius R1 of arc segment thirteen is 23.6 mm, the angle of arc segment fourteen is 35 degrees, the radius R2 of arc segment fourteen is 31.1 mm, the inclination angle of straight line segment eight is 157 degrees, the height of straight line segment eight is 4.9 mm, and the height of the wheel cover is 37.5 mm.

[0014] In the above-mentioned fan impeller, when the impeller diameter is 355 mm, the profile line of the front disc includes straight line segment nine, arc segment fifteen, arc segment sixteen and straight line segment ten connected in sequence. The inclination angle of straight line segment nine is 100 - 102 degrees, the height of straight line segment nine is 9.1 - 10.1 mm, the angle of arc segment fifteen is 42 - 44 degrees, the radius R3551 of arc segment fifteen is 27.8 - 29.8 mm, the angle of arc segment sixteen is 12 - 14 degrees, the radius R3552 of arc segment sixteen is 57.5 - 59.5 mm, the inclination angle of straight line segment ten is 156 - 158 degrees, the height of straight line segment ten is 8.5 - 9.5 mm, and the height of the wheel cover is 42 - 44 mm.

[0015] In the above-mentioned fan impeller, the inclination angle of straight line segment nine is 101 degrees, the height of straight line segment nine is 9.6 mm, the angle of arc segment fifteen is 43 degrees, the radius R3551 of arc segment fifteen is 28.8 mm, the angle of arc segment sixteen is 13 degrees, the radius R3552 of arc segment sixteen is 58.5 mm, the inclination angle of straight line segment ten is 157 degrees, the height of straight line segment ten is 9 mm, and the height of the wheel cover is 43 mm.

[0016] In the above-mentioned fan impeller, the impeller diameter is 400 mm. The profile of the front disc includes successively connected straight line segment eleven, arc segment seventeen, arc segment eighteen, arc segment nineteen, arc segment twenty, and straight line segment twelve. The inclination angle of straight line segment eleven is 101 - 103 degrees, the height of straight line segment eleven is 10.9 - 11.9 mm, the angle of arc segment seventeen is 8 - 10 degrees, the radius R4001 of arc segment seventeen is 30.7 - 32.7 mm, the angle of arc segment eighteen is 17 - 19 degrees, the radius R4002 of arc segment eighteen is 25.5 - 27.5 mm, the angle of arc segment nineteen is 22 - 24 degrees, the radius R4003 of arc segment nineteen is 39.4 - 41.4 mm, the angle of arc segment twenty is 3 - 5 degrees, the radius R4004 of arc segment twenty is 209 - 211 mm, the inclination angle of straight line segment twelve is 155 - 157 degrees, the height of straight line segment twelve is 8 - 9 mm, and the height of the wheel cover 1 is 47 - 49 mm.

[0017] In the above-mentioned fan impeller, the inclination angle of straight line segment eleven is 102 degrees, the height of straight line segment eleven is 11.4 mm, the angle of arc segment seventeen is 9 degrees, the radius R4001 of arc segment seventeen is 31.7 mm, the angle of arc segment eighteen is 18 degrees, the radius R4002 of arc segment eighteen is 26.5 mm, the angle of arc segment nineteen is 23 degrees, the radius R4003 of arc segment nineteen is 40.4 mm, the angle of arc segment twenty is 4 degrees, the radius R4004 of arc segment twenty is 210 mm, the inclination angle of straight line segment twelve is 156 degrees, the height of straight line segment twelve is 8.5 mm, and the height of the wheel cover is 48 mm.

[0018] In the above-mentioned fan impeller, the impeller diameter is 450 mm. The profile of the front disc includes successively connected straight line segment thirteen, arc segment twenty-one, arc segment twenty-two, straight line segment fourteen, and straight line segment fifteen. The inclination angle of straight line segment thirteen is 100 - 102 degrees, the height of straight line segment thirteen is 15 - 16 mm, the angle of arc segment twenty-one is 34 - 36 degrees, the radius R4501 of arc segment twenty-one is 29 - 31 mm, the angle of arc segment twenty-two is 17 - 19 degrees, the radius R4502 of arc segment twenty-two is 57 - 59 mm, the inclination angle of straight line segment fourteen is 154 - 156 degrees, the inclination angle of straight line segment fifteen is 158 - 160 degrees, the total height of straight line segment fourteen and straight line segment fifteen is 14 - 15 mm, and the height of the wheel cover is 54.5 - 56.5 mm.

[0019] In the above-mentioned fan impeller, the inclination angle of the straight section XIII is 102 degrees, the height of the straight section XIII is 15.5 mm, the angle of the arc section XXI is 35 degrees, the radius R4501 of the arc section XXI is 30 mm, the angle of the arc section XXII is 18 degrees, the radius R4502 of the arc section XXII is 58 mm, the inclination angle of the straight section XIV is 155 degrees, the inclination angle of the straight section XV is 159 degrees, the total height of the straight section XIV and the straight section XV is 14.5 mm, and the height of the wheel cover is 55.5 mm.

[0020] In the above-mentioned fan impeller, the impeller diameter is 500 mm. The profile line of the front disc includes successively connected straight section XVI, arc section XXIII, arc section XXIV, arc section XXV, straight section XVII and straight section XVIII. The inclination angle of the straight section XVI is 99 - 101 degrees, the height of the straight section XVI is 9.9 - 10.9 mm, the angle of the arc section XXIII is 10 - 12 degrees, the radius R5001 of the arc section XXIII is 61 - 63 mm, the angle of the arc section XXIV is 35 - 37 degrees, the radius R5002 of the arc section XXIV is 38.3 - 40.3 mm, the angle of the arc section XXV is 9 - 11 degrees, the radius R5003 of the arc section XXV is 80 - 82 mm, the inclination angle of the straight section XVII is 155 - 157 degrees, the inclination angle of the straight section XVIII is 157 - 159 degrees, the total height of the straight section XVII and the straight section XVIII is 14.5 - 15.5 mm, and the height of the wheel cover is 61 - 63 mm.

[0021] In the above-mentioned fan impeller, the inclination angle of the straight section XVI is 100 degrees, the height of the straight section XVI is 10.4 mm, the angle of the arc section XXIII is 11 degrees, the radius R5001 of the arc section XXIII is 62 mm, the angle of the arc section XXIV is 36 degrees, the radius R5002 of the arc section XXIV is 39.3 mm, the angle of the arc section XXV is 10 degrees, the radius R5003 of the arc section XXV is 81 mm, the inclination angle of the straight section XVII is 156 degrees, the inclination angle of the straight section XVIII is 158 degrees, the total height of the straight section XVII and the straight section XVIII is 15 mm, and the height of the wheel cover is 62 mm.

[0022] Compared with the existing technology, the advantages of this fan impeller are as follows: The profile line of the front disc can make the gas flow change slowly and have a smooth transition. The air flow is close to the inner wall of the front disc, the boundary layer is thin, which can reduce the air flow separation and the eddy current loss, and greatly improve the fan efficiency. Description of the Drawings

[0023] Figure 1 is a cross-sectional view of the fan impeller provided by the present utility model.

[0024] Figure 2 is a schematic diagram of line a and line b provided by the present utility model.

[0025] Figure 3 It is a schematic structural diagram of wire a provided by the present utility model.

[0026] Figure 4 It is a schematic structural diagram of wire b provided by the present utility model.

[0027] Figure 5 It is a cross-sectional view of the hub with an impeller diameter of 250 mm provided by the present utility model.

[0028] Figure 6 It is a cross-sectional view of the fan impeller with an impeller diameter of 280 mm provided by the present utility model.

[0029] Figure 7 It is a cross-sectional view of the fan impeller with an impeller diameter of 310 mm provided by the present utility model.

[0030] Figure 8 It is a cross-sectional view of the fan impeller with an impeller diameter of 355 mm provided by the present utility model.

[0031] Figure 9 It is a cross-sectional view of the fan impeller with an impeller diameter of 400 mm provided by the present utility model.

[0032] Figure 10 It is a cross-sectional view of the fan impeller with an impeller diameter of 450 mm provided by the present utility model.

[0033] Figure 11 It is a cross-sectional view of the fan impeller with an impeller diameter of 500 mm provided by the present utility model.

[0034] In the figure, overall: hub 1, disk 2, blade 3, front disk 4, diffuser disk 5;

[0035] Labels of wire a: arc segment one Xa1, arc segment two Xa2, arc segment three Xa3, arc segment four Xa4, straight segment one Xa5, radius of arc segment one Ra1, radius of arc segment two Ra2, radius of arc segment three Ra3, radius of arc segment four Ra4;

[0036] Labels of wire b: straight segment two Xb1, arc segment five Xb2, arc segment six Xb3, straight segment three Xb4, radius of arc segment five Rb1, radius of arc segment six Rb2;

[0037] Labels of the fan impeller with a diameter of 250: arc segment seven X2501, arc segment eight X2502, arc segment nine X2503, arc segment ten X2504, straight segment four X2505, radius of arc segment seven X2501 R2501, radius of arc segment eight X2502 R2502, radius of arc segment nine X2503 R2503, radius of arc segment ten X2504 R2504;

[0038] Fan impeller 280 labels: straight segment five X2801, arc segment eleven X2802, arc segment twelve X2803, straight segment six X2804, radius R2801 of arc segment eleven X2802, radius R2802 of arc segment twelve X2803;

[0039] Fan impeller 310 labels: straight segment seven X3101, arc segment thirteen X3102, arc segment fourteen X3103, straight segment eight X3104, radius R3101 of arc segment thirteen X3102, radius R3102 of arc segment fourteen X3103;

[0040] Fan impeller 355 labels: straight segment nine X3551, arc segment fifteen X3552, arc segment sixteen X3553, straight segment ten X3554, radius R3551 of arc segment fifteen X3552, radius R3552 of arc segment sixteen X3553;

[0041] Fan impeller 400 labels: straight segment eleven X4001, arc segment seventeen X4002, arc segment eighteen X4003, arc segment nineteen X4004, arc segment twenty X4005, straight segment twelve X4006, radius R4001 of arc segment seventeen X4002, radius R4002 of arc segment eighteen X4003, radius R4003 of arc segment nineteen X4004, radius R4004 of arc segment twenty X4005;

[0042] Fan impeller 450 labels: straight segment thirteen X4501, arc segment twenty - one X4502, arc segment twenty - two X4503, straight segment fourteen X4504, straight segment fifteen X4505, radius R4501 of arc segment twenty - one X4502, radius R4502 of arc segment twenty - two X4503;

[0043] Fan impeller 500 labels: straight segment sixteen X5001, arc segment twenty - three X5002, arc segment twenty - four X5003, arc segment twenty - five X5004, straight segment seventeen X5005, straight segment eighteen X5006, radius R5001 of arc segment twenty - three X5002, radius R5002 of arc segment twenty - four X5003, radius R5003 of arc segment twenty - five X5004. Specific implementation mode

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0045] Example 1

[0046] As Figure 1 、 2 shown, this fan impeller includes a hub cover 1, a hub plate 2 and a plurality of blades 3. The upper edge of the blade 3 is fixedly connected to the hub cover 1, the lower edge of the blade 3 is fixedly connected to the hub plate 2, and the blades 3 are evenly distributed along the circumferential direction of the hub plate 2. It is characterized in that the hub cover 1 includes a front disc 4 and a diffuser disc 5. The profile line of the front disc 4 is located in the area between line a and line b, and this area is shown as mark A.

[0047] As Figure 3 shown, line a includes successively connected circular arc segment one Xa1, circular arc segment two Xa2, circular arc segment three Xa3, circular arc segment four Xa4, and straight line segment one Xa5. The inclination angle of the starting point of circular arc segment one Xa1 is 92 degrees, the angle of circular arc segment one Xa1 is 9 degrees, the ratio of the radius Ra1 of circular arc segment one Xa1 to the impeller diameter is 0.2, the angle of circular arc segment two Xa2 is 33 degrees, the ratio of the radius Ra2 of circular arc segment two Xa2 to the impeller diameter is 0.086, the angle of circular arc segment three Xa3 is 13 degrees, the ratio of the radius Ra3 of circular arc segment three Xa3 to the impeller diameter is 0.083, the angle of circular arc segment four Xa4 is 10 degrees, the ratio of the radius Ra4 of circular arc segment four Xa4 to the impeller diameter is 0.17, the inclination angle of straight line segment one Xa5 is 156 degrees, and the ratio of the height of straight line segment one Xa5 to the impeller diameter is 0.032.

[0048] As Figure 4 shown, line b includes successively connected straight line segment two Xb1, circular arc segment five Xb2, circular arc segment six Xb3, and straight line segment three Xb4. The inclination angle of straight line segment two Xb1 is 107 degrees, the ratio of the height of straight line segment two Xb1 to the impeller diameter is 0.033, the angle of circular arc segment five Xb2 is 36 degrees, the ratio of the radius Rb1 of circular arc segment five Xb2 to the impeller diameter is 0.076, the angle of circular arc segment six Xb3 is 8 degrees, the ratio of the radius Rb2 of circular arc segment six Xb3 to the impeller diameter is 0.096, the inclination angle of straight line segment three Xb4 is 156 degrees, and the ratio of the height of straight line segment three Xb4 to the impeller diameter is 0.035.

[0049] The profile line of the front disc 4 can make the flow of gas change slowly and transition smoothly. The air flow is close to the inner wall of the front disc 4, the boundary layer is thin, which can reduce the air flow separation and reduce the eddy current loss, and greatly improve the fan efficiency.

[0050] Example 2

[0051] As Figure 5As shown in the figure, the impeller of this fan includes a hub cover 1, a hub plate 2, and several blades 3. The upper edge of the blade 3 is fixedly connected to the hub cover 1, and the lower edge of the blade 3 is fixedly connected to the hub plate 2. The blades 3 are evenly distributed along the circumferential direction of the hub plate 2. The diameter of the impeller is 250 mm. The profile line of the front disc 4 includes an arc segment seven X2501, an arc segment eight X2502, an arc segment nine X2503, an arc segment ten X2504, and a straight line segment four X2505 that are connected in sequence. The starting end inclination angle of the arc segment seven X2501 is 94 - 96 degrees, the angle of the arc segment seven X2501 is 15 - 17 degrees, the radius R2501 of the arc segment seven X2501 is 37.5 - 39.5 mm, the angle of the arc segment eight X2502 is 25 - 27 degrees, the radius R2502 of the arc segment eight X2502 is 16.3 - 18.3 mm, the angle of the arc segment nine X2503 is 5 - 7 degrees, the radius R2503 of the arc segment nine X2503 is 51 - 53 mm, the angle of the arc segment ten X2504 is 12 - 14 degrees, the radius R2504 of the arc segment ten X2504 is 9 - 11 mm, the inclination angle of the straight line segment four X2505 is 155 - 157 degrees, and the height of the hub cover 1 is 29 - 31 mm.

[0052] Preferably, the starting end inclination angle of the arc segment seven X2501 is 95 degrees, the angle of the arc segment seven X2501 is 16 degrees, the radius R2501 of the arc segment seven X2501 is 38.5 mm, the angle of the arc segment eight X2502 is 26 degrees, the radius R2502 of the arc segment eight X2502 is 17.3 mm, the angle of the arc segment nine X2503 is 6 degrees, the radius R2503 of the arc segment nine X2503 is 52 mm, the angle of the arc segment ten X2504 is 13 degrees, the radius R2504 of the arc segment ten X2504 is 10 mm, the inclination angle of the straight line segment four X2505 is 156 degrees, and the height of the hub cover 1 is 30 mm.

[0053] Example 3

[0054] As Figure 6As shown in the figure, the impeller of this fan includes a hub cover 1, a hub plate 2, and a number of blades 3. The upper edge of the blade 3 is fixedly connected to the hub cover 1, the lower edge of the blade 3 is fixedly connected to the hub plate 2, and the blades 3 are evenly distributed along the circumferential direction of the hub plate 2. The diameter of the impeller is 280 mm. The profile line of the front disc 4 includes a straight line segment five X2801, an arc segment eleven X2802, an arc segment twelve X2803, and a straight line segment six X2804 that are connected in sequence. The starting end inclination angle of the straight line segment five X2801 is 105 - 107 degrees, the height of the straight line segment five X2801 is 9.3 - 10.3 mm, the angle of the arc segment eleven X2802 is 27 - 29 degrees, the radius R2801 of the arc segment eleven X2802 is 21 - 23 mm, the angle of the arc segment twelve X2803 is 22 - 24 degrees, the radius R2802 of the arc segment twelve X2803 is 21 - 23 mm, the inclination angle of the straight line segment six X2804 is 155 - 157 degrees, the height of the straight line segment six X2804 is 9 - 10 mm, and the height of the hub cover 1 is 33 - 35 mm.

[0055] Preferably, the inclination angle of the straight line segment five X2801 is 106 degrees, the height of the straight line segment five X2801 is 9.8 mm, the angle of the arc segment eleven X2802 is 28 degrees, the radius R2801 of the arc segment eleven X2802 is 22 mm, the angle of the arc segment twelve X2803 is 23 degrees, the radius R2802 of the arc segment twelve X2803 is 22 mm, the inclination angle of the straight line segment six X2804 is 156 degrees, the height of the straight line segment six X2804 is 9.5 mm, and the height of the hub cover 1 is 34 mm.

[0056] Example 4

[0057] As Figure 7 shown in the figure, the impeller of this fan includes a hub cover 1, a hub plate 2, and a number of blades 3. The upper edge of the blade 3 is fixedly connected to the hub cover 1, the lower edge of the blade 3 is fixedly connected to the hub plate 2, and the blades 3 are evenly distributed along the circumferential direction of the hub plate 2. The diameter of the impeller is 310 mm. The profile line of the front disc 4 includes a straight line segment seven X3101, an arc segment thirteen X3102, an arc segment fourteen X3103, and a straight line segment eight X3104 that are connected in sequence. The inclination angle of the straight line segment seven X3101 is 97 - 99 degrees, the height of the straight line segment seven X3101 is 6.1 - 7.1 mm, the angle of the arc segment thirteen X3102 is 22 - 24 degrees, the radius R3101 of the arc segment thirteen X3102 is 22.6 - 24.6 mm, the angle of the arc segment fourteen X3103 is 34 - 36 degrees, the radius R3102 of the arc segment fourteen X3103 is 30.1 - 32.1 mm, the inclination angle of the straight line segment eight X3104 is 156 - 158 degrees, the height of the straight line segment eight X3104 is 4.4 - 5.4 mm, and the height of the hub cover 1 is 36.5 - 38.5 mm.

[0058] Preferably, the inclination angle of the straight line segment seven X3101 is 98 degrees, the height of the straight line segment seven X3101 is 6.6 mm, the angle of the arc segment thirteen X3102 is 23 degrees, the radius R1 of the arc segment thirteen X3102 is 23.6 mm, the angle of the arc segment fourteen X3103 is 35 degrees, the radius R2 of the arc segment fourteen X3103 is 31.1 mm, the inclination angle of the straight line segment eight X3104 is 157 degrees, the height of the straight line segment eight X3104 is 4.9 mm, and the height of the wheel cover 1 is 37.5 mm.

[0059] Example 5

[0060] As Figure 8 shown, the impeller of this fan includes a wheel cover 1, a wheel disc 2 and a number of blades 3. The upper edge of the blade 3 is fixedly connected to the wheel cover 1, the lower edge of the blade 3 is fixedly connected to the wheel disc 2, the blades 3 are evenly distributed along the circumferential direction of the wheel disc 2, the impeller diameter is 355 mm, the profile line of the front disc 4 includes a straight line segment nine X3551, an arc segment fifteen X3552, an arc segment sixteen X3553 and a straight line segment ten X3554 connected in sequence. The inclination angle of the straight line segment nine X3551 is 100 - 102 degrees, the height of the straight line segment nine X3551 is 9.1 - 10.1 mm, the angle of the arc segment fifteen X3552 is 42 - 44 degrees, the radius R3551 of the arc segment fifteen X3552 is 27.8 - 29.8 mm, the angle of the arc segment sixteen X3553 is 12 - 14 degrees, the radius R3552 of the arc segment sixteen X3553 is 57.5 - 59.5 mm, the inclination angle of the straight line segment ten X3554 is 156 - 158 degrees, the height of the straight line segment ten X3554 is 8.5 - 9.5 mm, and the height of the wheel cover 1 is 42 - 44 mm.

[0061] Preferably, the inclination angle of the straight line segment nine X3551 is 101 degrees, the height of the straight line segment nine X3551 is 9.6 mm, the angle of the arc segment fifteen X3552 is 43 degrees, the radius R3551 of the arc segment fifteen X3552 is 28.8 mm, the angle of the arc segment sixteen X3553 is 13 degrees, the radius R3552 of the arc segment sixteen X3553 is 58.5 mm, the inclination angle of the straight line segment ten X3554 is 157 degrees, the height of the straight line segment ten X3554 is 9 mm, and the height of the wheel cover 1 is 43 mm.

[0062] Example 6

[0063] As Figure 9As shown in the figure, the fan impeller includes a hub cover 1, a hub plate 2, and a number of blades 3. The upper edge of the blade 3 is fixedly connected to the hub cover 1, and the lower edge of the blade 3 is fixedly connected to the hub plate 2. The blades 3 are evenly distributed along the circumferential direction of the hub plate 2. The diameter of the impeller is 400 mm. The profile line of the front disc 4 includes a straight line segment eleven X4001, an arc segment seventeen X4002, an arc segment eighteen X4003, an arc segment nineteen X4004, an arc segment twenty X4005, and a straight line segment twelve X4006 that are connected in sequence. The inclination angle of the straight line segment eleven X4001 is 101 - 103 degrees, the height of the straight line segment eleven X4001 is 10.9 - 11.9 mm, the angle of the arc segment seventeen X4002 is 8 - 10 degrees, the radius R4001 of the arc segment seventeen X4002 is 30.7 - 32.7 mm, the angle of the arc segment eighteen X4003 is 17 - 19 degrees, the radius R4002 of the arc segment eighteen X4003 is 25.5 - 27.5 mm, the angle of the arc segment nineteen X4004 is 22 - 24 degrees, the radius R4003 of the arc segment nineteen X4004 is 39.4 - 41.4 mm, the angle of the arc segment twenty X4005 is 3 - 5 degrees, the radius R4004 of the arc segment twenty X4005 is 209 - 211 mm, the inclination angle of the straight line segment twelve X4006 is 155 - 157 degrees, the height of the straight line segment twelve X4006 is 8 - 9 mm, and the height of the hub cover 1 is 47 - 49 mm.

[0064] Preferably, the inclination angle of the straight line segment eleven X4001 is 102 degrees, the height of the straight line segment eleven X4001 is 11.4 mm, the angle of the arc segment seventeen X4002 is 9 degrees, the radius R4001 of the arc segment seventeen X4002 is 31.7 mm, the angle of the arc segment eighteen X4003 is 18 degrees, the radius R4002 of the arc segment eighteen X4003 is 26.5 mm, the angle of the arc segment nineteen X4004 is 23 degrees, the radius R4003 of the arc segment nineteen X4004 is 40.4 mm, the angle of the arc segment twenty X4005 is 4 degrees, the radius R4004 of the arc segment twenty X4005 is 210 mm, the inclination angle of the straight line segment twelve X4006 is 156 degrees, the height of the straight line segment twelve X4006 is 8.5 mm, and the height of the hub cover 1 is 48 mm.

[0065] Example 7

[0066] As Figure 10As shown in the figure, the fan impeller includes a hub cover 1, a hub plate 2 and a number of blades 3. The upper edge of the blade 3 is fixedly connected to the hub cover 1, and the lower edge of the blade 3 is fixedly connected to the hub plate 2. The blades 3 are evenly distributed along the circumferential direction of the hub plate 2. The diameter of the impeller is 450 mm. The profile of the front disc 4 includes successively connected straight line segment thirteen X4501, arc segment twenty-one X4502, arc segment twenty-two X4503, straight line segment fourteen X4504 and straight line segment fifteen X4505. The inclination angle of the straight line segment thirteen X4501 is 100 - 102 degrees, the height of the straight line segment thirteen X4501 is 15 - 16 mm, the angle of the arc segment twenty-one X4502 is 34 - 36 degrees, the radius R4501 of the arc segment twenty-one X4502 is 29 - 31 mm, the angle of the arc segment twenty-two X4503 is 17 - 19 degrees, the radius R4502 of the arc segment twenty-two X4503 is 57 - 59 mm, the inclination angle of the straight line segment fourteen X4504 is 154 - 156 degrees, the inclination angle of the straight line segment fifteen X4505 is 158 - 160 degrees, the total height of the straight line segment fourteen X4504 and the straight line segment fifteen X4505 is 14 - 15 mm, and the height of the hub cover 1 is 54.5 - 56.5 mm.

[0067] Preferably, the inclination angle of the straight line segment thirteen X4501 is 102 degrees, the height of the straight line segment thirteen X4501 is 15.5 mm, the angle of the arc segment twenty-one X4502 is 35 degrees, the radius R4501 of the arc segment twenty-one X4502 is 30 mm, the angle of the arc segment twenty-two X4503 is 18 degrees, the radius R4502 of the arc segment twenty-two X4503 is 58 mm, the inclination angle of the straight line segment fourteen X4504 is 155 degrees, the inclination angle of the straight line segment fifteen X4505 is 159 degrees, the total height of the straight line segment fourteen X4504 and the straight line segment fifteen X4505 is 14.5 mm, and the height of the hub cover 1 is 55.5 mm.

[0068] Example 8

[0069] As Figure 11As shown in the figure, the impeller of this fan includes a hub cover 1, a hub plate 2, and a number of blades 3. The upper edge of the blade 3 is fixedly connected to the hub cover 1, the lower edge of the blade 3 is fixedly connected to the hub plate 2, and the blades 3 are evenly distributed along the circumferential direction of the hub plate 2. The diameter of the impeller is 500 mm. The profile line of the front disc 4 includes successively connected straight line segment sixteen X5001, arc segment twenty-three X5002, arc segment twenty-four X5003, arc segment twenty-five X5004, straight line segment seventeen X5005, and straight line segment eighteen X5006. The inclination angle of the straight line segment sixteen X5001 is 99 - 101 degrees, the height of the straight line segment sixteen X5001 is 9.9 - 10.9 mm, the angle of the arc segment twenty-three X5002 is 10 - 12 degrees, the radius R5001 of the arc segment twenty-three X5002 is 61 - 63 mm, the angle of the arc segment twenty-four X5003 is 35 - 37 degrees, the radius R5002 of the arc segment twenty-four X5003 is 38.3 - 40.3 mm, the angle of the arc segment twenty-five X5004 is 9 - 11 degrees, the radius R5003 of the arc segment twenty-five X5004 is 80 - 82 mm, the inclination angle of the straight line segment seventeen X5005 is 155 - 157 degrees, the inclination angle of the straight line segment eighteen X5006 is 157 - 159 degrees, the total height of the straight line segment seventeen X5005 and the straight line segment eighteen X5006 is 14.5 - 15.5 mm, and the height of the hub cover 1 is 61 - 63 mm.

[0070] Preferably, the inclination angle of the straight line segment sixteen X5001 is 100 degrees, the height of the straight line segment sixteen X5001 is 10.4 mm, the angle of the arc segment twenty-three X5002 is 11 degrees, the radius R5001 of the arc segment twenty-three X5002 is 62 mm, the angle of the arc segment twenty-four X5003 is 36 degrees, the radius R5002 of the arc segment twenty-four X5003 is 39.3 mm, the angle of the arc segment twenty-five X5004 is 10 degrees, the radius R5003 of the arc segment twenty-five X5004 is 81 mm, the inclination angle of the straight line segment seventeen X5005 is 156 degrees, the inclination angle of the straight line segment eighteen X5006 is 158 degrees, the total height of the straight line segment seventeen X5005 and the straight line segment eighteen X5006 is 15 mm, and the height of the hub cover 1 is 62 mm.

[0071] In the method for determining the inclination angle in this article, if it is an arc segment, the inclination angle of a certain point on it is to draw a tangent line at that point, and then draw a horizontal line extending towards the center of the fan through the upper end of the tangent line. The angle between this horizontal line and the tangent line is the inclination angle of that point on the arc segment; if it is a straight line segment, then draw a horizontal line extending towards the center of the fan through the upper end of the straight line segment. The angle between this horizontal line and the straight line segment is the inclination angle of this straight line segment.

[0072] The specific embodiments described herein are merely illustrative of the present utility model. Those skilled in the art to which the present utility model pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the present utility model or exceed the scope defined by the appended claims.

[0073] Although the terms are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is only for more conveniently describing and explaining the essence of the present utility model; any interpretation of them as any additional limitation is contrary to the present utility model.

Claims

1. A fan impeller, comprising a wheel cover (1), a wheel disc (2) and a plurality of blades (3), wherein the upper edge of the blade (3) is fixedly connected to the wheel cover (1), the lower edge of the blade (3) is fixedly connected to the wheel disc (2), and the blades (3) are evenly distributed along the circumference of the wheel disc (2), characterized in that: The wheel cover (1) comprises a front disc (4) and a diffuser disc (5), wherein the profile of the front disc (4) is located in the area between line a and line b. Line a includes arc segment 1 (Xa1), arc segment 2 (Xa2), arc segment 3 (Xa3), arc segment 4 (Xa4), and straight line segment 1 (Xa5) which are connected in sequence. The inclination angle of the starting end of arc segment 1 (Xa1) is 92 degrees, the angle of arc segment 1 (Xa1) is 9 degrees, the ratio of radius Ra1 of arc segment 1 (Xa1) to impeller diameter is 0.2, and the angle of arc segment 2 (Xa2) is 33 degrees. The ratio of the radius Ra2 of the arc segment 2 (Xa2) to the impeller diameter is 0.086, the angle of the arc segment 3 (Xa3) is 13 degrees, the ratio of the radius Ra3 of the arc segment 3 (Xa3) to the impeller diameter is 0.083, the angle of the arc segment 4 (Xa4) is 10 degrees, the ratio of the radius Ra4 of the arc segment 4 (Xa4) to the impeller diameter is 0.17, and the inclination of the straight line segment 1 (Xa5) is 156 degrees. Line b includes a straight line segment 2 (Xb1), an arc segment 5 (Xb2), an arc segment 6 (Xb3), and a straight line segment 3 (Xb4) which are connected in sequence. The inclination angle of the straight line segment 2 (Xb1) is 107 degrees, the ratio of the height of the straight line segment 2 (Xb1) to the impeller diameter is 0.033, the angle of the arc segment 5 (Xb2) is 36 degrees, the ratio of the radius Rb1 of the arc segment 5 (Xb2) to the impeller diameter is 0.076, the angle of the arc segment 6 (Xb3) is 8 degrees, the ratio of the radius Rb2 of the arc segment 6 (Xb3) to the impeller diameter is 0.096, and the inclination angle of the straight line segment 3 (Xb4) is 156 degrees.

2. The fan impeller according to claim 1, characterized in that: When the impeller diameter is 250 mm, the profile of the front disk (4) includes arc segment seven (X2501), arc segment eight (X2502), arc segment nine (X2503), arc segment ten (X2504) and straight line segment four (X2505) which are connected in sequence, the starting end inclination angle of the arc segment seven (X2501) is 94-96 degrees, the angle of the arc segment seven (X2501) is 15-17 degrees, the radius R2501 of the arc segment seven (X2501) is 37.5-39.5 mm, the arc segment eight (X2502) is The angle is 25-27 degrees, the radius R2502 of arc segment eight (X2502) is 16.3-18.3 mm, the angle of arc segment nine (X2503) is 5-7 degrees, the radius R2503 of arc segment nine (X2503) is 51-53 mm, the angle of arc segment ten (X2504) is 12-14 degrees, the radius R2504 of arc segment ten (X2504) is 9-11 mm, the inclination angle of straight line segment four (X2505) is 155-157 degrees, and the height of the wheel cover (1) is 29-31 mm.

3. The fan impeller according to claim 2, characterized in that: The starting end inclination angle of arc segment seven (X2501) is 95 degrees, the angle of arc segment seven (X2501) is 16 degrees, the radius R2501 of arc segment seven (X2501) is 38.5 mm, the angle of arc segment eight (X2502) is 26 degrees, the radius R2502 of arc segment eight (X2502) is 17.3 mm, the angle of arc segment nine (X2503) is 6 degrees, the radius R2503 of arc segment nine (X2503) is 52 mm, the angle of arc segment ten (X2504) is 13 degrees, the radius R2504 of arc segment ten (X2504) is 10 mm, the inclination angle of straight line segment four (X2505) is 156 degrees, and the height of wheel cover (1) is 30 mm.

4. The fan impeller according to claim 1, characterized in that: When the impeller diameter is 280 mm, the profile of the front disk (4) includes a straight line segment 5 (X2801), an arc segment 11 (X2802), an arc segment 12 (X2803) and a straight line segment 6 (X2804) connected in sequence, the starting end inclination angle of the straight line segment 5 (X2801) is 105-107 degrees, the height of the straight line segment 5 (X2801) is 9.3-10.3 mm, the angle of the arc segment 11 (X2802) is 2 7-29 degrees, the radius R2801 of the arc segment eleven (X2802) is 21-23mm, the angle of the arc segment twelve (X2803) is 22-24 degrees, the radius R2802 of the arc segment twelve (X2803) is 21-23mm, the inclination angle of the straight line segment six (X2804) is 155-157 degrees, the height of the straight line segment six (X2804) is 9-10mm, and the height of the wheel cover (1) is 33-35㎜.

5. The fan impeller according to claim 4, characterized in that: The inclination angle of straight line segment five (X2801) is 106 degrees, the height of straight line segment five (X2801) is 9.8 mm, the angle of arc segment eleven (X2802) is 28 degrees, the radius R2801 of arc segment eleven (X2802) is 22 mm, the angle of arc segment twelve (X2803) is 23 degrees, the radius R2802 of arc segment twelve (X2803) is 22 mm, the inclination angle of straight line segment six (X2804) is 156 degrees, the height of straight line segment six (X2804) is 9.5 mm, and the height of wheel cover (1) is 34 mm.

6. The fan impeller according to claim 1, characterized in that: When the impeller diameter is 310 mm, the profile of the front disk (4) includes a straight line segment seven (X3101), an arc segment thirteen (X3102), an arc segment fourteen (X3103) and a straight line segment eight (X3104) which are connected in sequence, the inclination angle of the straight line segment seven (X3101) is 97-99 degrees, the height of the straight line segment seven (X3101) is 6.1-7.1 mm, the angle of the arc segment thirteen (X3102) is 22-24 degrees, and the arc segment thirteen The radius R3101 of (X3102) is 22.6-24.6 mm, the angle of arc segment fourteen (X3103) is 34-36 degrees, the radius R3102 of arc segment fourteen (X3103) is 30.1-32.1 mm, the inclination angle of straight line segment eight (X3104) is 156-158 degrees, the height of straight line segment eight (X3104) is 4.4-5.4 mm, and the height of wheel cover (1) is 36.5-38.5 mm.

7. The fan impeller according to claim 6, characterized in that: The inclination angle of straight line segment seven (X3101) is 98 degrees, the height of straight line segment seven (X3101) is 6.6 mm, the angle of arc segment thirteen (X3102) is 23 degrees, the radius R1 of arc segment thirteen (X3102) is 23.6 mm, the angle of arc segment fourteen (X3103) is 35 degrees, the radius R2 of arc segment fourteen (X3103) is 31.1 mm, the inclination angle of straight line segment eight (X3104) is 157 degrees, the height of straight line segment eight (X3104) is 4.9 mm, and the height of wheel cover (1) is 37.5 mm.

8. The fan impeller according to claim 1, characterized in that: When the impeller diameter is 355 mm, the profile of the front disk (4) includes a straight line segment nine (X3551), an arc segment fifteen (X3552), an arc segment sixteen (X3553) and a straight line segment ten (X3554) which are connected in sequence, the inclination angle of the straight line segment nine (X3551) is 100-102 degrees, the height of the straight line segment nine (X3551) is 9.1-10.1 mm, the angle of the arc segment fifteen (X3552) is 42-44 degrees, and the arc segment ten (X3554) is 100-102 degrees. The radius R3551 of arc segment fifteen (X3552) is 27.8-29.8 mm, the angle of arc segment sixteen (X3553) is 12-14 degrees, the radius R3552 of arc segment sixteen (X3553) is 57.5-59.5 mm, the inclination angle of straight line segment ten (X3554) is 156-158 degrees, the height of straight line segment ten (X3554) is 8.5-9.5 mm, and the height of the wheel cover (1) is 42-44 mm.

9. The fan impeller according to claim 8, characterized in that: The inclination angle of straight line segment nine (X3551) is 101 degrees, the height of straight line segment nine (X3551) is 9.6 mm, the angle of arc segment fifteen (X3552) is 43 degrees, the radius R3551 of arc segment fifteen (X3552) is 28.8 mm, the angle of arc segment sixteen (X3553) is 13 degrees, the radius R3552 of arc segment sixteen (X3553) is 58.5 mm, the inclination angle of straight line segment ten (X3554) is 157 degrees, the height of straight line segment ten (X3554) is 9 mm, and the height of wheel cover (1) is 43 mm.

10. The fan impeller according to claim 1, characterized in that: The impeller has a diameter of 400 mm, and the profile of the front disc (4) includes a straight line segment 11 (X4001), an arc segment 17 (X4002), an arc segment 18 (X4003), an arc segment 19 (X4004), an arc segment 20 (X4005), and a straight line segment 12 (X4006) which are connected in sequence. The inclination angle of the straight line segment 11 (X4001) is 101-103 degrees, the height of the straight line segment 11 (X4001) is 10.9-11.9 mm, the angle of the arc segment 17 (X4002) is 8-10 degrees, the radius R4001 of the arc segment 17 (X4002) is 30.7-32.7 mm, and the arc segment 18 (X4004) is 10.9-11.9 mm. The angle of the arc segment 4003 is 17-19 degrees, the radius R4002 of the arc segment 18 (X4003) is 25.5-27.5mm, the angle of the arc segment 19 (X4004) is 22-24 degrees, the radius R4003 of the arc segment 19 (X4004) is 39.4-41.4mm, the angle of the arc segment 20 (X4005) is 3-5 degrees, the radius R4004 of the arc segment 20 (X4005) is 209-211mm, the inclination angle of the straight line segment 12 (X4006) is 155-157 degrees, the height of the straight line segment 12 (X4006) is 8-9mm, and the height of the wheel cover (1) is 47-49㎜.

11. The fan impeller according to claim 10, characterized in that: The inclination angle of the straight line segment 11 (X4001) is 102 degrees, the height of the straight line segment 11 (X4001) is 11.4 mm, the angle of the arc segment 17 (X4002) is 9 degrees, the radius R4001 of the arc segment 17 (X4002) is 31.7 mm, the angle of the arc segment 18 (X4003) is 18 degrees, the radius R4002 of the arc segment 18 (X4003) is 26.5 mm, and the arc segment 19 The angle of (X4004) is 23 degrees, the radius R4003 of arc segment 19 (X4004) is 40.4 mm, the angle of arc segment 20 (X4005) is 4 degrees, the radius R4004 of arc segment 20 (X4005) is 210 mm, the inclination angle of straight line segment 12 (X4006) is 156 degrees, the height of straight line segment 12 (X4006) is 8.5 mm, and the height of wheel cover (1) is 48 mm.

12. The fan impeller according to claim 1, characterized in that: The impeller has a diameter of 450 mm, and the profile of the front disc (4) includes a straight line segment thirteen (X4501), an arc segment twenty-one (X4502), an arc segment twenty-two (X4503), a straight line segment fourteen (X4504) and a straight line segment fifteen (X4505) which are connected in sequence, the inclination angle of the straight line segment thirteen (X4501) is 100-102 degrees, the height of the straight line segment thirteen (X4501) is 15-16 mm, the angle of the arc segment twenty-one (X4502) is 34-36 degrees, and the arc segment twenty-one (X4502) is 100-102 degrees. ) has a radius R4501 of 29-31 mm, an angle of arc segment twenty-two (X4503) of 17-19 degrees, a radius R4502 of arc segment twenty-two (X4503) of 57-59 mm, an inclination angle of straight segment fourteen (X4504) of 154-156 degrees, an inclination angle of straight segment fifteen (X4505) of 158-160 degrees, a total height of straight segment fourteen (X4504) and straight segment fifteen (X4505) of 14-15 mm, and a height of the wheel cover (1) of 54.5-56.5 mm.

13. The fan impeller according to claim 12, characterized in that: The inclination angle of the straight line segment thirteen (X4501) is 102 degrees, the height of the straight line segment thirteen (X4501) is 15.5 mm, the angle of the arc segment twenty-one (X4502) is 35 degrees, the radius R4501 of the arc segment twenty-one (X4502) is 30 mm, the angle of the arc segment twenty-two (X4503) is 18 degrees, the radius R4502 of the arc segment twenty-two (X4503) is 58 mm, the inclination angle of the straight line segment fourteen (X4504) is 155 degrees, the inclination angle of the straight line segment fifteen (X4505) is 159 degrees, the total height of the straight line segment fourteen (X4504) and the straight line segment fifteen (X4505) is 14.5 mm, and the height of the wheel cover (1) is 55.5 mm.

14. The fan impeller according to claim 1, characterized in that: The impeller has a diameter of 500 mm, and the profile of the front disk (4) includes a straight line segment 16 (X5001), an arc segment 23 (X5002), an arc segment 24 (X5003), an arc segment 25 (X5004), a straight line segment 17 (X5005) and a straight line segment 18 (X5006) which are connected in sequence. The inclination angle of the straight line segment 16 (X5001) is 99-101 degrees, the height of the straight line segment 16 (X5001) is 9.9-10.9 mm, the angle of the arc segment 23 (X5002) is 10-12 degrees, the radius R5001 of the arc segment 23 (X5002) is 61-63 mm, and the arc segment The angle of arc segment twenty-four (X5003) is 35-37 degrees, the radius R5002 of arc segment twenty-four (X5003) is 38.3-40.3 mm, the angle of arc segment twenty-five (X5004) is 9-11 degrees, the radius R5003 of arc segment twenty-five (X5004) is 80-82 mm, the inclination angle of straight line segment seventeen (X5005) is 155-157 degrees, the inclination angle of straight line segment eighteen (X5006) is 157-159 degrees, the total height of straight line segment seventeen (X5005) and straight line segment eighteen (X5006) is 14.5-15.5 mm, and the height of the wheel cover (1) is 61-63 mm.

15. The fan impeller according to claim 14, characterized in that: The inclination angle of the straight line segment 16 (X5001) is 100 degrees, the height of the straight line segment 16 (X5001) is 10.4 mm, the angle of the arc segment 23 (X5002) is 11 degrees, the radius R5001 of the arc segment 23 (X5002) is 62 mm, the angle of the arc segment 24 (X5003) is 36 degrees, and the radius R5002 of the arc segment 24 (X5003) is 39.3 mm, the angle of arc segment twenty-five (X5004) is 10 degrees, the radius R5003 of arc segment twenty-five (X5004) is 81 mm, the inclination angle of straight line segment seventeen (X5005) is 156 degrees, the inclination angle of straight line segment eighteen (X5006) is 158 degrees, the total height of straight line segment seventeen (X5005) and straight line segment eighteen (X5006) is 15 mm, and the height of the wheel cover (1) is 62 mm.

Images