Fan

Abstract

The utility model belongs to the technical field of fans, and particularly relates to a fan. The fan comprises a fan impeller, the fan impeller is connected with a rotor, the rotor is connected with a motor, a current collector is further arranged at the air inlet end of the fan impeller, the current collector is fixed to the motor through a support, 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, and the lower edges of the blades are fixedly connected with the impeller disc. The blades are evenly distributed in the circumferential direction of the wheel disc, the wheel cover comprises a front disc and a diffusion disc, the molded line of the front disc is located in the area between a line a and a line b, the flow collector comprises an installation disc and a flow guide ring, and the molded line of the flow guide ring is located in the area between a line c and a line d. The fan has the advantages of being small in overall resistance, small in airflow loss, low in noise and high in efficiency.

Description

Technical Field

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

[0002] The main body of the flow passage part of a centrifugal fan mainly consists of an impeller, a casing, and a collector. The impeller is a key component of the fan, and its main function is to introduce external air flow and convert it into air flow generated by internal mechanical movement. The collector is a stationary flow guiding component, and its function is to introduce axial air intake into the fan impeller. The cross-sectional arc shape of the collector directly affects the form of the air flow entering the impeller.

[0003] When the air flow passes through the collector and the shroud, it will be subject to frictional resistance and form resistance. Among them, the frictional resistance is generated by the viscosity of the fluid, and a very thin fluid layer with a large velocity gradient is formed on the adjacent side, that is, the boundary layer. 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. The efficiency of the fan is thus affected and needs to be further improved. Content of the Utility Model

[0004] The purpose of the utility model is to provide a fan 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 includes a fan impeller, the fan impeller is connected to a rotor, the rotor is connected to a motor, and a collector is further provided at the air inlet end of the fan impeller. The collector is fixed to the motor through a bracket;

[0006] The fan impeller includes a shroud, a hub, and a plurality of blades. The upper edge of the blade is fixedly connected to the shroud, the lower edge of the blade is fixedly connected to the hub, the blades are evenly distributed along the circumferential direction of the hub, and the shroud includes a front disc and a diffuser disc. The profile line of the front disc is located in the area between line a and line b.

[0007] 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 impeller diameter is 0.2, the angle of arc segment 2 is 33 degrees, the ratio of the radius Ra2 of arc segment 2 to the impeller diameter is 0.086, the angle of arc segment 3 Xa3 is 13 degrees, the ratio of the radius Ra3 of arc segment 3 to the impeller diameter is 0.083, the angle of arc segment 4 is 10 degrees, the ratio of the radius Ra4 of arc segment 4 to the impeller diameter is 0.17, and the inclination angle of straight line segment 1 is 156 degrees.

[0008] 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;

[0009] The collector includes a mounting disc and a guide ring. The profile line of the guide ring is located in the area between line c and line d.

[0010] Line c includes successively connected arc segment seven, arc segment eight, and straight line Yc3. The angle of arc segment seven is 78 degrees, the ratio of the radius Rc1 of arc segment seven to the impeller diameter is 0.086, the angle of arc segment eight is 16 degrees, the ratio of the radius Rc2 of arc segment eight to the impeller diameter is 0.1943, and the inclination angle of straight line segment four is 94 degrees.

[0011] Line d includes successively connected arc segment nine, arc segment ten, arc segment eleven, and straight line segment five. The angle of arc segment nine is 22 degrees, the ratio of the radius Rd1 of arc segment nine to the impeller diameter is 0.057, the angle of arc segment ten is 63 degrees, the ratio of the radius Rd2 of arc segment ten to the impeller diameter is 0.0836, the angle of arc segment eleven is 16 degrees, the ratio of the radius Rd3 of arc segment eleven to the impeller diameter is 0.28, and the inclination angle of straight line segment five is 102 degrees.

[0012] In the above-mentioned fan, when the impeller diameter is 250 mm, the profile line of the front disc includes successively connected arc segment twelve, arc segment thirteen, arc segment fourteen, arc segment fifteen, and straight line segment six. The starting-end inclination angle of arc segment twelve is 94 - 96 degrees, the angle of arc segment twelve is 15 - 17 degrees, the radius R2501 of arc segment twelve is 37.5 - 39.5 mm, the angle of arc segment thirteen is 25 - 27 degrees, the radius R2502 of arc segment thirteen is 16.3 - 18.3 mm, the angle of arc segment fourteen is 5 - 7 degrees, the radius R2503 of arc segment fourteen is 51 - 53 mm, the angle of arc segment fifteen is 12 - 14 degrees, the radius R2504 of arc segment fifteen is 9 - 11 mm, the inclination angle of straight line segment six is 155 - 157 degrees, and the height of the hub cover is 29 - 31 mm.

[0013] In the above-mentioned fan, the starting-end inclination angle of arc segment twelve is 95 degrees, the angle of arc segment twelve is 16 degrees, the radius R2501 of arc segment twelve is 38.5 mm, the angle of arc segment thirteen is 26 degrees, the radius R2502 of arc segment thirteen is 17.3 mm, the angle of arc segment fourteen is 6 degrees, the radius R2503 of arc segment fourteen is 52 mm, the angle of arc segment fifteen is 13 degrees, the radius R2504 of arc segment fifteen is 10 mm, the inclination angle of straight segment six is 156 degrees, and the height of the wheel cover is 30 mm.

[0014] In the above-mentioned fan, when the impeller diameter is 250 mm, the profile of the guide vane ring includes successively connected arc segment sixteen, arc segment seventeen, and arc segment eighteen. The angle of arc segment sixteen is 22 degrees, the radius YR2501 of arc segment sixteen is 15 mm, the angle of arc segment seventeen is 63 degrees, the radius YR2502 of arc segment seventeen is 22 mm, the angle of arc segment eighteen is 16 degrees, the radius YR2503 of arc segment eighteen is 73.76, and the inclination angle of the tangent line at the ending-end of arc segment eighteen is 102 degrees.

[0015] In the above-mentioned fan, when the impeller diameter is 280 mm, the profile of the front disc includes successively connected straight segment seven, arc segment nineteen, arc segment twenty, and straight segment eight. The starting-end inclination angle of straight segment seven is 105 - 107 degrees, the height of straight segment seven is 9.3 - 10.3 mm, the angle of arc segment nineteen is 27 - 29 degrees, the radius R2801 of arc segment nineteen is 21 - 23 mm, the angle of arc segment twenty is 22 - 24 degrees, the radius R2802 of arc segment twenty is 21 - 23 mm, the inclination angle of straight segment eight is 155 - 157 degrees, the height of straight segment eight is 9 - 10 mm, and the height of the wheel cover is 33 - 35 mm.

[0016] In the above-mentioned fan, the inclination angle of straight segment seven is 106 degrees, the height of straight segment seven is 9.8 mm, the angle of arc segment nineteen is 28 degrees, the radius R2801 of arc segment nineteen is 22 mm, the angle of arc segment twenty is 23 degrees, the radius R2802 of arc segment twenty is 22 mm, the inclination angle of straight segment eight is 156 degrees, the height of straight segment eight is 9.5 mm, and the height of the wheel cover is 34 mm.

[0017] In the above-mentioned fan, when the impeller diameter is 280 mm, the profile of the guide vane ring includes successively connected arc segment twenty-one, arc segment twenty-two, and straight segment nine. The angle of arc segment twenty-one is 78 degrees, the radius YR2801 of arc segment twenty-one is 21.5 mm, the angle of arc segment twenty-two is 16 degrees, the radius YR2802 of arc segment twenty-two is 51.85 mm, the inclination angle of straight segment nine is 94 degrees, and the height of straight segment nine is 21 - 23 mm.

[0018] In the above-mentioned fan, the ratio of the inlet diameter of the wheel cover to the impeller diameter is 0.7 - 0.73, the ratio of the outlet diameter of the wheel cover to the impeller diameter is 0.95 - 0.9, the ratio of the height of the wheel cover to the impeller diameter is 0.12 - 0.13, the ratio of the inlet diameter of the air collector to the impeller diameter is 0.8 - 0.87, the ratio of the outlet diameter of the air collector to the impeller diameter is 0.65 - 0.7, the ratio of the throat diameter of the air collector to the impeller diameter is 0.65 - 0.67, and the ratio between the height of the air collector and the impeller diameter is 0.15 - 0.2.

[0019] In the above-mentioned fan, when the impeller diameter is 250 mm, the inlet diameter of the wheel cover is 177 mm, the outlet diameter of the wheel cover is 239.8 mm, the inlet diameter D1 of the air collector is 204.5 mm, the outlet diameter D2 of the air collector is 171.4 mm, the throat diameter D3 of the air collector is 165.5 mm, and the height of the air collector is 40.7 mm.

[0020] In the above-mentioned fan, when the impeller diameter is 280 mm, the inlet diameter of the wheel cover is 198 mm, the outlet diameter of the wheel cover is 272 mm, the inlet diameter D1 of the air collector is 238 mm, the outlet diameter D2 of the air collector is 193 mm, the throat diameter D3 of the air collector is 186 mm, and the height of the air collector is 53 mm.

[0021] Compared with the existing technology, the advantages of this fan are as follows: The front disc profile of the wheel cover can make the gas flow change slowly and smoothly transition. The air flow is close to the inner wall of the front disc, with a thin boundary layer, which can reduce air flow separation and eddy current loss. The air collector can accelerate the gas flowing into the fan, ensuring that the gas flows into the fan impeller evenly under the condition of very small pressure loss. The combination of the two makes the overall resistance of the fan small, the air flow loss less, the noise low, and the fan efficiency high. Brief Description of the Drawings

[0022] Figure 1 is a three-dimensional view of the fan provided by the present utility model.

[0023] Figure 2 is a cross-sectional view of the fan provided by the present utility model.

[0024] Figure 3 is a schematic diagram of line a and line b provided by the present utility model.

[0025] Figure 4 is a schematic structural diagram of line a provided by the present utility model.

[0026] Figure 5 is a schematic structural diagram of line b provided by the present utility model.

[0027] Figure 6It is a schematic diagram of wire c and wire d provided by the present utility model.

[0028] Figure 7 It is a schematic structural diagram of wire c provided by the present utility model.

[0029] Figure 8 It is a schematic structural diagram of wire d provided by the present utility model.

[0030] Figure 9 It is a cross-sectional view of a collector with an impeller diameter of 250 mm provided by the present utility model.

[0031] Figure 10 It is a cross-sectional view of a hub with an impeller diameter of 250 mm provided by the present utility model.

[0032] Figure 11 It is a cross-sectional view of a collector with an impeller diameter of 280 mm provided by the present utility model.

[0033] Figure 12 It is a cross-sectional view of a fan impeller with an impeller diameter of 280 mm provided by the present utility model.

[0034] In the figure, overall: fan impeller 1, rotor 2, motor 3, collector 4, bracket 5, hub 6, wheel disc 7, blade 8, front disc 9, diffuser disc 10, mounting disc 11, guide ring 12;

[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 wire c: arc segment seven Yc1, arc segment eight Yc2, straight segment four Yc3, radius of arc segment seven Rc1, radius of arc segment eight Rc2;

[0038] Labels of wire d: arc segment nine Yd1, arc segment ten Yd2, arc segment eleven Yd3, straight segment five Yd4, radius of arc segment nine Rd1, radius of arc segment ten Rd2, radius of arc segment eleven Rd3;

[0039] Fan impeller 250 labels: Arc segment twelve X2501, Arc segment thirteen X2502, Arc segment fourteen X2503, Arc segment fifteen X2504, Straight segment six X2505, Radius R2501 of Arc segment twelve X2501, Radius R2502 of Arc segment thirteen X2502, Radius R2503 of Arc segment fourteen X2503, Radius R2504 of Arc segment fifteen X2504;

[0040] Labels of the 250mm air inlet cone: Arc segment sixteen Y2501, Arc segment seventeen Y2502, Arc segment eighteen Y2503, Radius YR2501 of Arc segment sixteen Y2501, Radius YR2502 of Arc segment seventeen Y2502, Radius YR2503 of Arc segment eighteen Y2503;

[0041] Fan impeller 280 labels: Straight segment seven X2801, Arc segment nineteen X2802, Arc segment twenty X2803, Straight segment eight X2804, Radius R2801 of Arc segment nineteen X2802, Radius R2802 of Arc segment twenty X2803;

[0042] Labels of the 280mm air inlet cone: Arc segment twenty - one Y2801, Arc segment twenty - two Y2802, Straight segment nine Y2803, Radius YR2801 of Arc segment twenty - one Y2801, Radius YR2802 of Arc segment twenty - two Y2802. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0044] Embodiment 1

[0045] As Figures 1-8 shown, this fan includes a fan impeller 1, the fan impeller 1 is connected to a rotor 2, the rotor 2 is connected to a motor 3, an air inlet cone 4 is further provided at the air inlet end of the fan impeller 1, and the air inlet cone 4 is fixed to the motor 3 through a bracket 5;

[0046] The fan impeller 1 includes a hub 6, a disc 7 and a plurality of blades 8. The upper edge of the blade 8 is fixedly connected to the hub 6, the lower edge of the blade 8 is fixedly connected to the disc 7, and the blades 8 are evenly distributed along the circumferential direction of the disc 7. It is characterized in that the hub 6 includes a front disc 9 and a diffuser disc 10, and the profile line of the front disc 9 is located in the area between line a and line b.

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

[0048] Line b includes successively connected straight line segment two Xb1, arc segment five Xb2, 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 arc segment five Xb2 is 36 degrees, the ratio of the radius Rb1 of arc segment five Xb2 to the impeller diameter is 0.076, the angle of arc segment six Xb3 is 8 degrees, the ratio of the radius Rb2 of arc segment six Xb3 to the impeller diameter is 0.096, and the inclination angle of straight line segment three Xb4 is 156 degrees;

[0049] The collector 4 includes a mounting disc 11 and a guide ring 12. The profile line of the guide ring 12 is located in the area between line c and line d.

[0050] Line c includes successively connected arc segment seven Yc1, arc segment eight Yc2, and straight line segment four Yc3. The angle of arc segment seven Yc1 is 78 degrees, the ratio of the radius Rc1 of arc segment seven Yc1 to the impeller diameter is 0.086, the angle of arc segment eight Yc2 is 16 degrees, the ratio of the radius Rc2 of arc segment eight Yc2 to the impeller diameter is 0.1943, and the inclination angle of straight line segment four Yc3 is 94 degrees.

[0051] Line d includes successively connected arc segment nine Yd1, arc segment ten Yd2, arc segment eleven Yd3, and straight line segment five Yd4. The angle of arc segment nine Yd1 is 22 degrees, the ratio of the radius Rd1 of arc segment nine Yd1 to the impeller diameter is 0.057, the angle of arc segment ten Yd2 is 63 degrees, the ratio of the radius Rd2 of arc segment ten Yd2 to the impeller diameter is 0.0836, the angle of arc segment eleven Yd3 is 16 degrees, the ratio of the radius Rd3 of arc segment eleven Yd3 to the impeller diameter is 0.28, and the inclination angle of straight line segment five Yd4 is 102 degrees.

[0052] The ratio of the inlet diameter of the wheel cover 6 to the impeller diameter is 0.7 - 0.73, the ratio of the outlet diameter of the wheel cover 6 to the impeller diameter is 0.95 - 0.9, the ratio of the height of the wheel cover 6 to the impeller diameter is 0.12 - 0.13, the ratio of the inlet diameter of the collector 4 to the impeller diameter is 0.8 - 0.87, the ratio of the outlet diameter of the collector 4 to the impeller diameter is 0.65 - 0.7, the ratio of the throat diameter of the collector 4 to the impeller diameter is 0.65 - 0.67, and the ratio of the height of the collector 4 to the impeller diameter is 0.15 - 0.2.

[0053] The profile line of the front disc 9 of the wheel cover 6 can make the gas flow change slowly and smoothly transition. The air flow is close to the inner wall of the front disc 9, with a thin boundary layer, which can reduce air flow separation and eddy current loss.

[0054] The collector 4 is composed of a converging section, a transition section and a diffusing section. After the air flow enters the collector 4, it first accelerates slowly, forms a high-speed air flow at the throat, and then diffuses evenly to fill the entire impeller passage. The collector 4 can accelerate the gas flowing into the fan, so that it can ensure that the gas flows into the fan impeller 1 evenly under the condition of very small pressure loss. The combination of the two makes the overall resistance of the fan small, the air flow loss small, the noise small, and the fan efficiency high.

[0055] Example 2

[0056] As Figure 9 、 10 shown, when the impeller diameter of the fan is 250 mm, the profile line of the front disc 9 includes the arc segment twelve X2501, the arc segment thirteen X2502, the arc segment fourteen X2503, the arc segment fifteen X2504 and the straight line segment six X2505 connected in sequence. The starting end inclination angle of the arc segment twelve X2501 is 94 - 96 degrees, the angle of the arc segment twelve X2501 is 15 - 17 degrees, the radius R2501 of the arc segment twelve X2501 is 37.5 - 39.5 mm, the angle of the arc segment thirteen X2502 is 25 - 27 degrees, the radius R2502 of the arc segment thirteen X2502 is 16.3 - 18.3 mm, the angle of the arc segment fourteen X2503 is 5 - 7 degrees, the radius R2503 of the arc segment fourteen X2503 is 51 - 53 mm, the angle of the arc segment fifteen X2504 is 12 - 14 degrees, the radius R2504 of the arc segment fifteen X2504 is 9 - 11 mm, the inclination angle of the straight line segment six X2505 is 155 - 157 degrees, and the height of the wheel cover 6 is 29 - 31 mm.

[0057] The starting end inclination angle of the twelfth circular arc segment X2501 is 95 degrees, the angle of the twelfth circular arc segment X2501 is 16 degrees, the radius R2501 of the twelfth circular arc segment X2501 is 38.5 mm, the angle of the thirteenth circular arc segment X2502 is 26 degrees, the radius R2502 of the thirteenth circular arc segment X2502 is 17.3 mm, the angle of the fourteenth circular arc segment X2503 is 6 degrees, the radius R2503 of the fourteenth circular arc segment X2503 is 52 mm, the angle of the fifteenth circular arc segment X2504 is 13 degrees, the radius R2504 of the fifteenth circular arc segment X2504 is 10 mm, the inclination angle of the sixth straight line segment X2505 is 156 degrees, and the height of the wheel cover 6 is 30 mm.

[0058] The profile line of the flow guide ring 12 includes successively connected sixteenth circular arc segment Y2501, seventeenth circular arc segment Y2502, and eighteenth circular arc segment Y2503. The angle of the sixteenth circular arc segment Y2501 is 22 degrees, the radius YR2501 of the sixteenth circular arc segment Y2501 is 15 mm, the angle of the seventeenth circular arc segment Y2502 is 63 degrees, the radius YR2502 of the seventeenth circular arc segment Y2502 is 22 mm, the angle of the eighteenth circular arc segment Y2503 is 16 degrees, the radius YR2503 of the eighteenth circular arc segment Y2503 is 73.76, and the inclination angle of the tangent line at the end point of the eighteenth circular arc segment Y2503 is 102 degrees.

[0059] The inlet diameter of the wheel cover 6 is 177 mm, the outlet diameter of the wheel cover 6 is 239.8 mm, the inlet diameter of the air collector 4 is 204.5 mm, the outlet diameter of the air collector 4 is 171.4 mm, the throat diameter of the air collector 4 is 165.5 mm, and the height of the air collector 4 is 40.7 mm.

[0060] Embodiment 3

[0061] As Figure 11 、 12 shown, when the impeller diameter of the fan is 280 mm, the profile line of the front disc 9 includes successively connected seventh straight line segment X2801, nineteenth circular arc segment X2802, twentieth circular arc segment X2803, and eighth straight line segment X2804. The starting end inclination angle of the seventh straight line segment X2801 is 105 - 107 degrees, the height of the seventh straight line segment X2801 is 9.3 - 10.3 mm, the angle of the nineteenth circular arc segment X2802 is 27 - 29 degrees, the radius R2801 of the nineteenth circular arc segment X2802 is 21 - 23 mm, the angle of the twentieth circular arc segment X2803 is 22 - 24 degrees, the radius R2802 of the twentieth circular arc segment X2803 is 21 - 23 mm, the inclination angle of the eighth straight line segment X2804 is 155 - 157 degrees, the height of the eighth straight line segment X2804 is 9 - 10 mm, and the height of the wheel cover 6 is 33 - 35 mm.

[0062] The inclination angle of the straight line segment seven X2801 is 106 degrees, the height of the straight line segment seven X2801 is 9.8 mm, the angle of the arc segment nineteen X2802 is 28 degrees, the radius R2801 of the arc segment nineteen X2802 is 22 mm, the angle of the arc segment twenty X2803 is 23 degrees, the radius R2802 of the arc segment twenty X2803 is 22 mm, the inclination angle of the straight line segment eight X2804 is 156 degrees, the height of the straight line segment eight X2804 is 9.5 mm, and the height of the wheel cover 6 is 34 mm.

[0063] The profile line of the flow guide ring 12 includes successively connected arc segments twenty-one Y2801, arc segments twenty-two Y2802, and straight line segment nine Y2803. The angle of the arc segment twenty-one Y2801 is 78 degrees, the radius YR2801 of the arc segment twenty-one Y2801 is 21.5 mm, the angle of the arc segment twenty-two Y2802 is 16 degrees, the radius YR2802 of the arc segment twenty-two Y2802 is 51.85 mm, the inclination angle of the straight line segment nine Y2803 is 94 degrees, and the height of the straight line segment nine Y2803 is 21 - 23 mm.

[0064] The inlet diameter of the wheel cover 6 is 198 mm, the outlet diameter of the wheel cover 6 is 272 mm, the inlet diameter D1 of the collector 4 is 238 mm, the outlet diameter D2 of the collector 4 is 193 mm, the throat diameter D3 of the collector 4 is 186 mm, and the height of the collector 4 is 53 mm.

[0065] In the inclination angle determination method 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.

[0066] The specific embodiments described in this article are only examples of the present invention. Those skilled in the technical field to which the present invention pertains can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, but will not deviate from the present invention or exceed the scope defined by the appended claims.

[0067] Although this article uses more terms, it does not exclude the possibility of using other terms. Using these terms is only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the present invention.

Claims

1. A fan, characterized in that: The fan impeller (1) is connected to a rotor (2), the rotor (2) is connected to a motor (3), and a collector (4) is provided at the air inlet end of the fan impeller (1), and the collector (4) is fixed to the motor (3) via a bracket (5); The fan impeller (1) comprises a wheel cover (6), a wheel disc (7) and a plurality of blades (8), wherein the upper edge of the blade (8) is fixedly connected to the wheel cover (6), the lower edge of the blade (8) is fixedly connected to the wheel disc (7), the blades (8) are evenly distributed along the circumference of the wheel disc (7), the wheel cover (6) comprises a front disc (9) and a diffuser disc (10), the profile of the front disc (9) 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) 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; The current collector (4) comprises a mounting plate (11) and a guide ring (12), wherein the profile of the guide ring (12) is located in the area between line c and line d. Line c includes arc segment seven (Yc1), arc segment eight (Yc2) and straight line segment four (Yc3) connected in sequence, the angle of arc segment seven (Yc1) is 78 degrees, the ratio of the radius Rc1 of arc segment seven (Yc1) to the impeller diameter is 0.086, the angle of arc segment eight (Yc2) is 16 degrees, the ratio of the radius Rc2 of arc segment eight (Yc2) to the impeller diameter is 0.1943, and the inclination angle of straight line segment four (Yc3) is 94 degrees. Line d includes arc segment nine (Yd1), arc segment ten (Yd2), arc segment eleven (Yd3) and straight line segment five (Yd4) which are connected in sequence. The angle of arc segment nine (Yd1) is 22 degrees, the ratio of the radius Rd1 of arc segment nine (Yd1) to the impeller diameter is 0.057, the angle of arc segment ten (Yd2) is 63 degrees, the ratio of the radius Rd2 of arc segment ten (Yd2) to the impeller diameter is 0.0836, the angle of arc segment eleven (Yd3) is 16 degrees, the ratio of the radius Rd3 of arc segment eleven (Yd3) to the impeller diameter is 0.28, and the inclination angle of straight line segment five (Yd4) is 102 degrees.

2. The fan according to claim 1, characterized in that: When the impeller diameter is 250 mm, the profile of the front disk (9) includes arc segment 12 (X2501), arc segment 13 (X2502), arc segment 14 (X2503), arc segment 15 (X2504) and straight line segment 6 (X2505) which are connected in sequence, the starting end inclination angle of arc segment 12 (X2501) is 94-96 degrees, the angle of arc segment 12 (X2501) is 15-17 degrees, the radius R2501 of arc segment 12 (X2501) is 37.5-39.5 mm, arc segment 13 (X2502) is 15-17 degrees, the radius R2501 of arc segment 12 (X2501) is 37.5-39.5 mm, arc segment 13 (X2502) is 15-17 degrees, the radius R2502 of arc segment 13 (X2503) is 15-17 degrees, the radius R2501 of arc segment 12 (X2501) is 37.5-39.5 mm ...1 of arc segment 13 (X2502) is 15-17 degrees, the radius R2501 of arc segment 13 (X2503) is 15-17 degrees, the radius R2501 of arc segment 13 (X2503) is 15-17 degrees, the radius R2501 of arc segment 13 (X2503) is 15-17 degrees, the radius R2501 of arc segment 13 (X2503) is The angle of the arc segment thirteen (X2502) is 25-27 degrees, the radius R2502 of the arc segment thirteen (X2502) is 16.3-18.3mm, the angle of the arc segment fourteen (X2503) is 5-7 degrees, the radius R2503 of the arc segment fourteen (X2503) is 51-53mm, the angle of the arc segment fifteen (X2504) is 12-14 degrees, the radius R2504 of the arc segment fifteen (X2504) is 9-11mm, the inclination angle of the straight line segment six (X2505) is 155-157 degrees, and the height of the wheel cover (6) is 29-31mm.

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

4. The fan according to claim 3, characterized in that: When the impeller diameter is 250 mm, the profile of the guide ring (12) includes arc segment 16 (Y2501), arc segment 17 (Y2502), and arc segment 18 (Y2503) which are connected in sequence, the angle of arc segment 16 (Y2501) is 22 degrees, the radius YR2501 of arc segment 16 (Y2501) is 15 mm, the angle of arc segment 17 (Y2502) is 63 degrees, the radius YR2502 of arc segment 17 (Y2502) is 22 mm, the angle of arc segment 18 (Y2503) is 16 degrees, the radius YR2503 of arc segment 18 (Y2503) is 73.76, and the inclination angle of the tangent line at the end point of arc segment 18 (Y2503) is 102 degrees.

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

6. The fan according to claim 5, characterized in that: The inclination angle of straight line segment seven (X2801) is 106 degrees, the height of straight line segment seven (X2801) is 9.8 mm, the angle of arc segment nineteen (X2802) is 28 degrees, the radius R2801 of arc segment nineteen (X2802) is 22 mm, the angle of arc segment twenty (X2803) is 23 degrees, the radius R2802 of arc segment twenty (X2803) is 22 mm, the inclination angle of straight line segment eight (X2804) is 156 degrees, the height of straight line segment eight (X2804) is 9.5 mm, and the height of wheel cover (6) is 34 mm.

7. The fan according to claim 6, characterized in that: When the impeller diameter is 280 mm, the profile of the guide ring (12) includes arc segment twenty-one (Y2801), arc segment twenty-two (Y2802), and straight line segment nine (Y2803) which are connected in sequence, the angle of arc segment twenty-one (Y2801) is 78 degrees, the radius YR2801 of arc segment twenty-one (Y2801) is 21.5 mm, the angle of arc segment twenty-two (Y2802) is 16 degrees, the radius YR2802 of arc segment twenty-two (Y2802) is 51.85 mm, the inclination angle of straight line segment nine (Y2803) is 94 degrees, and the height of straight line segment nine (Y2803) is 21-23 mm.

8. The fan according to any one of claims 1 to 7, characterized in that: The ratio of the diameter of the air inlet of the wheel cover (6) to the diameter of the impeller is 0.7-0.73, the ratio of the diameter of the air outlet of the wheel cover (6) to the diameter of the impeller is 0.95-0.9, the ratio of the height of the wheel cover (6) to the diameter of the impeller is 0.12-0.13, the ratio of the diameter of the air inlet of the collector (4) to the diameter of the impeller is 0.8-0.87, the ratio of the diameter of the air outlet of the collector (4) to the diameter of the impeller is 0.65-0.7, the ratio of the throat diameter of the collector (4) to the diameter of the impeller is 0.65-0.67, and the ratio of the height of the collector (4) to the diameter of the impeller is 0.15-0.

2.

9. The fan according to claim 8, characterized in that: When the impeller diameter is 250 mm, the air inlet diameter of the wheel cover (6) is 177 mm, the air outlet diameter of the wheel cover (6) is 239.8 mm, the air inlet diameter D1 of the collector (4) is 204.5 mm, the air outlet diameter D2 of the collector (4) is 171.4 mm, the throat diameter D3 of the collector (4) is 165.5 mm, and the height of the collector (4) is 40.7 mm.

10. The fan according to claim 8, characterized in that: When the impeller diameter is 280 mm, the air inlet diameter of the wheel cover (6) is 198 mm, the air outlet diameter of the wheel cover (6) is 272 mm, the air inlet diameter D1 of the collector (4) is 238 mm, the air outlet diameter D2 of the collector (4) is 193 mm, the throat diameter D3 of the collector (4) is 186 mm, and the height of the collector (4) is 53 mm.

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