A forward curved fan blade, impeller and centrifugal fan

Abstract

The present invention discloses a forward-curved fan blade, an impeller and a centrifugal fan, wherein the forward-curved fan blade comprises a blade, the blade is arranged in a circular arc curve, the blade is unfolded and a first rectangular coordinate system is established with an end point of the bottom edge of the blade as the coordinate origin, the horizontal axis of the first rectangular coordinate system is the straight line where the bottom edge of the unfolded blade is located, points are taken in sequence in the first rectangular coordinate system, adjacent points are connected by smooth lines, and the horizontal axis of the rectangular coordinate system and the smooth connection line of adjacent points form an unfolded diagram of the blade; through the arrangement of this structure, the air outlet efficiency of the forward-curved fan can be effectively improved and the surge of the forward-curved fan can be reduced.

Description

Technical Field

[0001] The invention relates to a fan, in particular to a forward curved fan blade and an impeller and a centrifugal fan. Background Art

[0002] In traditional centrifugal fans, the impeller front disc also adopts a conical and single-arc structure, and the blades adopt a single arc shape and a narrow flow channel. The airflow energy enhancement opportunity is small, and the small air output increases the airflow resistance, resulting in high fluidity and airflow resistance when the air enters, thereby generating flow vortex noise of the airflow, which is prone to "surge" phenomenon and increases the noise during fan operation. Summary of the invention

[0003] The technical problem to be solved by the present invention is to solve at least one of the problems mentioned above.

[0004] The solution of the present invention to solve its technical problem is:

[0005] A forward curved wind blade comprises a blade, wherein the blade is arranged in an arc curve, the blade is unfolded and a first rectangular coordinate system is established with one end point of the bottom edge of the blade as the coordinate origin, the horizontal axis of the first rectangular coordinate system is the straight line where the bottom edge of the unfolded blade is located, and points (0, 0), (15.04, 72.31), (19.75, 141.79), (24.41, 139.26), (29.02, 136.99), (33.59, 134.93), (38.13, 133.05), (42.63, 131.33), (47.11, 129.77), (51.58, 128.33), (56.02, 127.03), (60.45, 125.83), (64. 84, 124.75), (69.14, 123.76), (73.38, 122.87), (77.55, 122.08), (81.65, 121.37), (85.71, 120.74), (89.71, 120.2), (93.66, 119.74), (97.58, 119.36), (101.45, 119.06), (105.29, 118.83), (109.1, 118.67), (112.88, 118.59), (116.64, 118.58), (139.2, 118.58), (139.2, 0), adjacent points are connected by smooth lines, and the horizontal axis of the rectangular coordinate system and the smooth lines of adjacent points form an unfolded diagram of the blade.

[0006] As a further improvement of the above scheme, a second rectangular coordinate system is established. The unit length of the second rectangular coordinate system is the same as that of the first rectangular coordinate system. The plane where the first rectangular coordinate system is located is perpendicular to the plane where the second rectangular coordinate system is located. Points (-13.4, 178.27), (0, 185.1), (4.22, 187.21), (8.41, 189.22), (12.6, 191.15), (16.78, 192. 99)、(20.97,194.74)、(25.15,196.42)、(29.34,198.02)、(33.53,199.53)、(37.73,200.97)、(41.95,202.33)、(46.14,203.63)、(50.26,204.87)、(54.33,206.06)、(58.34,207.19)、(62.3,208.29)、(66. 21,209.34), (70.09,210.34), (73.92,211.31), (77.72,212.23), (81.49,213.12), (85.24,213.97), (88.96,214.79), (92.66,215.56), (96.34,216.3), (100.01,217), (103.66,217.67), (107.29,218. 31), (110.91, 218.91), (114.51, 219.48), (118.1, 220.01), (118.59, 220.08), the points taken on the second rectangular coordinate system are smoothly connected in sequence, the blade is formed by bending the smooth connecting line corresponding to the points taken on the second rectangular coordinate system, and the point (0, 185.1) on the second rectangular coordinate system is the projection of the vertical line with the horizontal mark 19.75 on the first rectangular coordinate system on the second rectangular coordinate system.

[0007] As a further improvement of the above scheme, the second rectangular coordinate system is a smooth arc curve formed by connecting the points in sequence, and the radii r of the arc curves where the points in sequence are located in the second rectangular coordinate system are 178.78, 185.1, 187.26, 189.41, 191.66, 193.72, 195.87, 198.02, 200.18, 202.33, 204.48, 206.64, 208.79, 210.94, 213.1, 215.25, 217.4, 219.56, 221.71, 223.87, 226.02, 228.17, 230.33, 232.48, 234.63, 236.79, 238.94, 241.09, 243.25, 245.4, 247.55, 249.71, 250.

[0008] An impeller, comprising a front disk and a rear disk, the front disk being arranged in a horizontal direction, and also comprising a forward curved fan blade, the blade being arranged between the front disk and the rear disk, the front disk and the rear disk being parallel to each other, the bottom edge of the blade being fixedly connected to the rear disk and the front disk, the blade being perpendicular to the rear disk, a third rectangular coordinate system being established with the center origin of the rear disk, the blade intersecting with the longitudinal axis of the third rectangular coordinate system, the end of the blade close to the center of the rear disk being connected to the coordinate origin of the third rectangular coordinate system to form a first line segment, the first line segment and the third rectangular coordinate system being connected The longitudinal axis of the coordinate system forms a left deviation angle, which is β1, β1=4.23°, the wind outlet angle of the blade is β4, β4=36.55°, the wind inlet angle of the blade is β3, β3=22.7°, the line connecting the coordinate origin of the third rectangular coordinate system and the outer diameter of the blade forms a second line segment, and the second line segment and the longitudinal axis of the third rectangular coordinate system form a right deviation angle β2, β2=29.6°, and a plurality of blades are provided, and the plurality of blades are arranged in a circular array around the coordinate origin of the third rectangular coordinate system, and the highest point of the blade is arranged close to the center of the rear disc.

[0009] As a further improvement of the above scheme, an opening is opened on the front disk, the inner diameter of the opening is C1, the inner diameter surrounded by several impellers is C2, the outer diameter surrounded by several impellers is C3, C3 is 500, C1 is 370.2, C2 is 362.6, and the unit lengths of C1 and C2 are the same as the unit lengths of the first rectangular coordinate system.

[0010] As a further improvement of the above scheme, the opening of the front plate is bent toward the direction away from the rear plate to form a bent edge, the inner diameter of the bent edge is the inner diameter of the opening, the bent arc opening of the bent edge is away from the center of the front plate, the radius of the bending arc is 20.42, the wall of the front plate is set in an arc, the front plate and the bent edge have a smooth transition, the arc radius of the wall of the front plate is 62.5, the arc opening of the front plate is away from the center of the front plate, and the unit length of the bending arc radius and the arc radius of the wall of the front plate is equal to the unit length of the first rectangular coordinate system.

[0011] As a further improvement of the above scheme, the distance between the end surfaces of the front disk and the rear disk facing away from each other is 158, and the bit length of the distance between the end surfaces of the front disk and the rear disk facing away from each other is equal to the unit length of the first rectangular coordinate system.

[0012] As a further improvement of the above solution, 16 blades are provided.

[0013] A centrifugal fan comprises a volute, wherein the volute has an air inlet and an air outlet, and an impeller, wherein the impeller is arranged in the volute, the front disk is directly opposite to the air inlet, a fourth rectangular coordinate system is established on the end surface of the volute with the center of the air inlet as the origin, the direction of the air outlet is in the same direction as the longitudinal axis of the fourth rectangular coordinate system, the longitudinal axis of the fourth rectangular coordinate system is vertically upward, a first square, a second square, a third square, and a fourth square are drawn in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant of the fourth rectangular coordinate system, respectively, one of the vertex angles of the first square, the second square, the third square, and the fourth square coincides with the origin of the fourth rectangular coordinate system, and the first square, An adjacent right-angled side of the second square, the third square, and the fourth square coincides with the horizontal axis of the fourth rectangular coordinate and the vertical axis of the fourth rectangular coordinate, the corners of the first square, the second square, the third square, and the fourth square away from the fourth rectangular coordinate are respectively the first arc, the second arc, the third arc, and the fourth arc are respectively tangent to the adjacent first arc, the second arc, the third arc, and the fourth arc, respectively, the side lengths of the fourth square, the third square, the second square, and the first square are respectively 58.1, 47.3, 38.4, and 31.3, the fourth arc, the third arc, the second arc, and the first arc are respectively 574.3, 469, 383.4, and 313.6, to form the outer wall of the volute.

[0014] As a further improvement of the above scheme, the distance from the side of the air outlet away from the origin of the fourth rectangular coordinate system to the origin of the fourth rectangular coordinate system is 622.4, the width of the air outlet along the plane where the fourth rectangular coordinate system is located is 436.1, and the air outlet end of the volute is 350.7 away from the fourth arc.

[0015] The beneficial effect of the present invention is that, through the arrangement of the structure, the air outlet efficiency of the forward curved fan can be effectively improved and the surge of the forward curved fan can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0017] Figure 1 is an exploded view of the centrifugal fan of the present invention;

[0018] Figure 2 is a schematic diagram of a volute of the present invention;

[0019] Figure 3 It is a schematic diagram of the first rectangular coordinate system of the present invention;

[0020] Figure 4 is a schematic diagram of a second rectangular coordinate system of the present invention;

[0021] Figure 5 is a partial cross-sectional view of the front side of the impeller of the present invention;

[0022] Figure 6 It is a side sectional view of the impeller of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0024] Reference Figure 1 to Figure 6A forward curved wind blade comprises a blade 1, wherein the blade 1 is arranged in an arc curve, the blade 1 is unfolded and a first rectangular coordinate system 2 is established with one end point of the bottom edge of the blade 1 as the coordinate origin, the horizontal axis of the first rectangular coordinate system 2 is the straight line where the bottom edge of the unfolded blade 1 is located, and points (0, 0), (15.04, 72.31), (19.75, 141.79), (24.41, 139.26), (29.02, 136.99), (33.59, 134.93), (38.13, 133.05), (42.63, 131.33), (47.11, 129.77), (51.58, 128.33), (56.02, 127.03), (60.45, 125.83), are taken in sequence in the first rectangular coordinate system 2. (64.84, 124.75), (69.14, 123.76), (73.38, 122.87), (77.55, 122.08), (81.65, 121.37), (85.71, 120.74), (89.71, 120.2), (93.66, 119.74), (97.58, 119.36), (101.45 , 119.06), (105.29, 118.83), (109.1, 118.67), (112.88, 118.59), (116.64, 118.58), (139.2, 118.58), (139.2, 0), adjacent points are connected by smooth lines, and the horizontal axis of the rectangular coordinate system and the smooth lines of adjacent points form an unfolded view of blade 1.

[0025] Through the arrangement of this structure, the air outlet efficiency of the forward curved fan can be effectively improved and the surging of the forward curved fan can be reduced.

[0026] As a further preferred embodiment, a second rectangular coordinate system 3 is established. The second rectangular coordinate system 3 has the same unit length as the first rectangular coordinate system 2. The plane where the first rectangular coordinate system 2 is located is perpendicular to the plane where the second rectangular coordinate system 3 is located. In the two rectangular coordinate systems, points (-13.4, 178.27), (0, 185.1), (4.22, 187.21), (8.41, 189.22), (12.6, 191.15), (16.78, 19 2.99)、(20.97,194.74)、(25.15,196.42)、(29.34,198.02)、(33.53,199.53)、(37.73,200.97)、(41.95,202.33)、(46.14,203.63)、(50.26,204.87)、(54.33,206.06)、(58.34,207.19)、(62.3,208.29)、(66. 21,209.34)、(70.09,210.34)、(73.92,211.31)、(77.72,212.23)、(81.49,213.12)、(85.24,213.97)、(88.96,214.79)、(92.66,215.56)、(96.34,216.3)、(100.01,217)、(103.66,217.67)、(107.29,218.31) , (110.91, 218.91), (114.51, 219.48), (118.1, 220.01), (118.59, 220.08), the points taken on the second rectangular coordinate system 3 are smoothly connected in sequence, the blade 1 is bent by the smooth connecting line corresponding to the points taken on the second rectangular coordinate system 3, and the point (0, 185.1) on the second rectangular coordinate system 3 is the projection of the vertical line with the horizontal mark 19.75 on the first rectangular coordinate system 2 on the second rectangular coordinate system 3.

[0027] As a further preferred embodiment, the second rectangular coordinate system 3 is a smooth arc curve formed by sequentially connecting the points, and the radii r of the arc curves where the points sequentially taken on the second rectangular coordinate system 3 are located are 178.78, 185.1, 187.26, 189.41, 191.66, 193.72, 195.87, 198.02, 200.18, 202.33, 204.48 respectively. , 206.64, 208.79, 210.94, 213.1, 215.25, 217.4, 219.56, 221.71, 223.87, 226.02, 228.17, 230.33, 232.48, 234.63, 236.79, 238.94, 241.09, 243.25, 245.4, 247.55, 249.71, 250.

[0028] An impeller comprises a front disk 4 and a rear disk 5, wherein the front disk 4 is arranged in a horizontal direction, and further comprises a forward curved fan blade, wherein the blade 1 is arranged between the front disk 4 and the rear disk 5, wherein the front disk 4 and the rear disk 5 are parallel to each other, wherein the bottom edge of the blade 1 is fixedly connected to the rear disk 5 and the front disk 4, wherein the blade 1 is perpendicular to the rear disk 5, wherein a third rectangular coordinate system 6 is established with the center origin of the rear disk 5, wherein the blade 1 intersects with the longitudinal axis of the third rectangular coordinate system 6, wherein the coordinate origin of the third rectangular coordinate system 6 is the end of the blade 1 close to the center of the chassis and the coordinate origin of the third rectangular coordinate system 6 is connected to form a first line segment, wherein The first line segment forms a left deviation angle with the longitudinal axis of the third rectangular coordinate system 6, and the left deviation angle is β1, β1=4.23°. The wind outlet angle of the blade 1 is β4, β4=36.55°. The wind inlet angle of the blade 1 is β3, β3=22.7°. The line connecting the coordinate origin of the third rectangular coordinate system 6 and the outer diameter of the blade 1 forms a second line segment, and the second line segment forms a right deviation angle β2 with the longitudinal axis of the third rectangular coordinate system 6, β2=29.6°. There are a plurality of blades 1, and the plurality of blades 1 are arranged in a circular array around the coordinate origin of the third rectangular coordinate system 6, and the highest point of the blade 1 is arranged close to the center of the rear disc 5.

[0029] Further as a preferred embodiment, an opening 7 is opened on the front disk 4, the inner diameter of the opening 7 is C1, the inner diameter surrounded by the plurality of impellers is C2, the outer diameter surrounded by the plurality of impellers is C3, C3 is 500, C1 is 370.2, C2 is 362.6, and the unit lengths of C1 and C2 are the same as the unit lengths of the first rectangular coordinate system 2.

[0030] Further as a preferred embodiment, the opening 7 of the front plate 4 is bent toward the direction away from the rear plate 5 to form a bent edge, the inner diameter of the bent edge is the inner diameter of the opening 7, the bent arc opening of the bent edge is away from the center of the front plate 4, the bending arc radius is 20.42, the wall of the front plate 4 is set in an arc, the front plate 4 and the bent edge have a smooth transition, the arc radius of the wall of the front plate 4 is 62.5, the arc opening of the front plate 4 is away from the center of the front plate 4, and the unit length of the bending arc radius and the arc radius of the wall of the front plate 4 is equal to the unit length of the first rectangular coordinate system 2.

[0031] Further as a preferred embodiment, the distance between the end surfaces of the front disk 4 and the rear disk 5 facing away from each other is 158, and the unit length of the distance between the end surfaces of the front disk 4 and the rear disk 5 facing away from each other is equal to the unit length of the first rectangular coordinate system 2.

[0032] As a further preferred embodiment, the number of the blades 1 is 16.

[0033] A centrifugal fan, comprising a volute 8, the volute 8 having an air inlet and an air outlet 17, an impeller, the impeller being arranged in the volute 8, the front disk 4 facing the air inlet, a fourth rectangular coordinate system 18 being established on the end surface of the volute 8 with the center of the air inlet as the origin, the direction of the air outlet 17 being in the same direction as the longitudinal axis of the fourth rectangular coordinate system 18, the longitudinal axis of the fourth rectangular coordinate system 18 being vertically upward, a first square 9, a second square 10, a third square 11, and a fourth square 12 being drawn in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant of the fourth rectangular coordinate system, respectively, one of the vertices of the first square 9, the second square 10, the third square 11, and the fourth square 12 coincides with the origin of the fourth rectangular coordinate system 18, and the first square 9, the second square 10, the third square 11, and the fourth square 12 are respectively drawn in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant, 0, an adjacent right-angled side of the third square 11 and the fourth square 12 coincides with the horizontal axis of the fourth rectangular coordinate and the vertical axis of the fourth rectangular coordinate, the corners of the first square 9, the second square 10, the third square 11 and the fourth square 12 away from the fourth rectangular coordinate are respectively the first arc 13, the second arc 14, the third arc 15 and the fourth arc 16 as the origin, the adjacent first arc 13, the second arc 14, the third arc 15 and the fourth arc 16 are respectively tangent, the side lengths of the fourth square 12, the third square 11, the second square 10 and the first square 9 are 58.1, 47.3, 38.4 and 31.3 respectively, the fourth arc 16, the third arc 15, the second arc 14 and the first arc 13 are 574.3, 469, 383.4 and 313.6 respectively, to form the outer wall of the volute 8. The side lengths of the fourth square 12 , the third square 11 , the second square 10 , and the first square 9 are all the same as the unit length of the first rectangular coordinate system 2 .

[0034] As a further preferred embodiment, the distance from the side of the air outlet 17 away from the origin of the fourth rectangular coordinate system 18 to the origin of the fourth rectangular coordinate system 18 is 622.4, the width of the air outlet 17 along the plane where the fourth rectangular coordinate system 18 is located is 436.1, and the distance from the end of the air outlet 17 of the volute 8 to the fourth arc 16 is 350.7. The above values ​​are all the same as the unit length of the first rectangular coordinate system 2.

[0035] In order to verify this scheme, a wind tunnel test was conducted on a centrifugal fan in this scheme. The following results were obtained. During the test, the atmospheric pressure pa = 100056Pa, the atmospheric temperature ta = 27.83℃, the relative humidity RH = 0.87, and the impeller diameter was 500mm. The results are shown in Table 1 below:

[0036] Table 1:

[0037]

[0038] The conventional centrifugal fan, that is, the conventional volute 8 and the conventional impeller were used for the experiment. During the experiment, the diameter of the conventional impeller was 500 mm, the atmospheric pressure pa = 100056 Pa, the atmospheric temperature ta = 27°C, and the relative humidity RH = 0.87. The experimental results are shown in Table 2 below.

[0039] Table 2:

[0040]

[0041] The conventional volute 8 and the impeller of the present invention were combined for the experiment, the diameter of the conventional impeller was 500 mm, the atmospheric pressure pa = 100056 Pa, the atmospheric temperature ta = 27° C., and the relative humidity RH = 0.87. The experimental results are shown in Table 3 below.

[0042] Table 3:

[0043]

[0044]

[0045] The volute 8 of the present solution was used to conduct experiments with a conventional impeller. During the experiments, the diameter of the conventional impeller was 500 mm, the atmospheric pressure pa = 100056 Pa, the atmospheric temperature ta = 27° C., and the relative humidity RH = 0.87. The experimental results are shown in Table 4 below.

[0046] Table 4:

[0047]

[0048] As can be seen from Tables 1 to 4 above, the experimental data in Table 1 has the best effect. When the volume flow rate is similar, the impeller of the experimental object in Table 1 has the lowest power at the same operating point, which can effectively achieve the effect of saving energy. At the same time, at the same operating point, the A-level is also the lowest among the experimental data in Table 1, and the noise is the lowest.

[0049] However, through the analysis of Tables 1 to 4 above, it can be concluded that the impeller of this solution, when applied to the traditional volute 8, has a significant performance improvement in fan efficiency and static efficiency compared to the combination of the traditional impeller and the traditional volute 8, and can produce similar volume flow with less impeller power. However, when the volute 8 of this solution is combined with the traditional impeller, the effect is significantly worse than the effect of the combination of the traditional impeller and the traditional volute 8. However, in this solution, when the volute 8 of this solution is combined with the impeller of this solution, the best effect in the above-mentioned groups of experiments is achieved.

[0050] The preferred embodiments of the present invention are specifically described above, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A forward curved fan blade, comprising a blade (1), characterized in that: The blade (1) is arranged in an arc curve. The blade (1) is unfolded and a first rectangular coordinate system (2) is established with one end point of the bottom edge of the blade (1) as the coordinate origin. The horizontal axis of the first rectangular coordinate system (2) is the straight line where the bottom edge of the unfolded blade (1) is located. Points (0, 0), (15.04, 72.31), (19.75, 141.79), (24.41, 139.26), (29.02, 136.99), (33.59, 134.93), (38.13, 133.05), (42.63, 131.33), (47.11, 129.77), and (51.58, 128.33) are taken in sequence in the first rectangular coordinate system (2). 、(56.02,127.03)、(60.45,125.83)、(64.84,124.75)、(69.14,123.76)、(73.38,122.87)、(77.55,122.08)、(81.65,121.37)、(85.71,120.74)、(89.71,120.2)、(93.66,119.74)、(97.58,119.36)、(101.45,119.06)、(105.29,118.83)、(109.1,118.67)、(112.88,118.59)、(116.64,118.58)、(139.2 , 118.58), (139.2, 0), adjacent points are connected by smooth lines, and the horizontal axis of the rectangular coordinate system and the smooth lines of adjacent points form an unfolded view of the blade (1); a second rectangular coordinate system (3) is established, the second rectangular coordinate system (3) has the same unit length as the first rectangular coordinate system (2), the plane where the first rectangular coordinate system (2) is located is perpendicular to the plane where the second rectangular coordinate system (3) is located, and points (-13.4, 178.27), (0, 185.1), (4.22, 187.21), (8.41, 189.22), (12.6, 191.15), (16.78, 192.99), (20.97, 1 94.74)、(25.15,196.42)、(29.34,198.02)、(33.53,199.53)、(37.73,200.97)、(41.95,202.33)、(46.14,203.63)、(50.26,204.87)、(54.33,206.06)、(58.34,207.19)、(62.3,208.29)、(66.21,209.34)、(70.09,210.34)、(73.92,211.31)、(77.72,212.23)、(81.49,213.12)、(85.24,213.97)、(88.96,214.79), (92.66,215.56), (96.34,216.3), (100.01,217), (103.66,217.67), (107.29,218.31), (110.91,218.91), (114.51,219.48), (118.1,220.01), (118.59,220.08), the points taken on the second rectangular coordinate system (3) are smoothly transitioned and connected in sequence, the blade (1) is formed by bending the smooth connection line corresponding to the points taken on the second rectangular coordinate system (3), the point (0,185.1) on the second rectangular coordinate system (3) is the projection of the vertical line on the first rectangular coordinate system (2) where the horizontal mark is 19.75 on the second rectangular coordinate system (3); the second rectangular coordinate system (3) is a smooth arc curve formed by connecting the points in sequence. The radii r of the arc curves where the points in sequence are located on the second rectangular coordinate system (3) are 178.78, 185.1, 187.26, 189.41, 191.66, 193.72, 195.87, 198.02, 200.18, 202.33, 204.48, 206.64, 2 08.79, 210.94, 213.1, 215.25, 217.4, 219.56, 221.71, 223.87, 226.02, 228.17, 230.33, 232.48, 234.63, 236.79, 238.94, 241.09, 243.25, 245.4, 247.55, 249.71, 250. .

2. An impeller, comprising a front disc (4) and a rear disc (5), wherein the front disc (4) is arranged in a horizontal direction, and characterized in that: It also includes a forward-curved fan blade as claimed in claim 1, wherein the blade (1) is arranged between the front disk (4) and the rear disk (5), the front disk (4) and the rear disk (5) are parallel to each other, the bottom edge of the blade (1) is fixedly connected to the rear disk (5), and the front edge is fixedly connected to the front disk (4), the blade (1) is perpendicular to the rear disk (5), a third rectangular coordinate system (6) is established with the center origin of the rear disk (5), the blade (1) intersects with the longitudinal axis of the third rectangular coordinate system (6), the end of the blade (1) close to the center of the rear disk (5) is connected to the coordinate origin of the third rectangular coordinate system (6) to form a first line segment, and the first line segment and the third rectangular coordinate system (6) are connected. The longitudinal axis of the three rectangular coordinate systems (6) forms a left deviation angle, the left deviation angle is β1, β1=4.23°, the wind outlet angle of the blade (1) is β4, β4=36.55°, the wind inlet angle of the blade (1) is β3, β3=22.7°, the line connecting the coordinate origin of the third rectangular coordinate system (6) and the outer diameter of the blade (1) forms a second line segment, the second line segment and the longitudinal axis of the third rectangular coordinate system (6) form a right deviation angle β2, β2=29.6°, a plurality of blades (1) are provided, and the plurality of blades (1) are arranged in a circular array around the coordinate origin of the third rectangular coordinate system (6), and the highest point of the blade (1) is arranged close to the center of the rear disc (5).

3. An impeller according to claim 2, characterized in that: The front disc (4) is provided with an opening (7), the inner diameter of the opening (7) is C1, the inner diameter formed by the plurality of impellers is C2, the outer diameter formed by the plurality of impellers is C3, C3 is 500, C1 is 370.2, C2 is 362.6, and the unit lengths of C1 and C2 are the same as the unit lengths of the first rectangular coordinate system (2).

4. An impeller according to claim 2, characterized in that: The opening (7) of the front plate (4) is bent in a direction away from the rear plate (5) to form a bent edge, the inner diameter of the bent edge is the inner diameter of the opening (7), the bent arc opening of the bent edge faces away from the center of the front plate (4), the radius of the bent arc is 20.42, the wall of the front plate (4) is arranged in an arc, the front plate (4) and the bent edge are smoothly transitioned, the arc radius of the wall of the front plate (4) is 62.5, the arc opening of the front plate (4) faces away from the center of the front plate (4), and the unit lengths of the bending arc radius and the arc radius of the wall of the front plate (4) are equal to the unit length of the first rectangular coordinate system (2).

5. An impeller according to claim 2, characterized in that: The distance between the end surfaces of the front disk (4) and the rear disk (5) facing away from each other is 158, and the bit length of the distance between the end surfaces of the front disk (4) and the rear disk (5) facing away from each other is equal to the unit length of the first rectangular coordinate system (2).

6. An impeller according to claim 2, characterized in that: The number of blades (1) is 16.

7. A centrifugal fan, comprising a volute (8), wherein the volute (8) has an air inlet and an air outlet (17), characterized in that: The invention comprises an impeller as claimed in any one of claims 2 to 6, wherein the impeller as claimed in any one of claims 2 to 6 is arranged in the volute (8), the front disk (4) is directly opposite to the air inlet, a fourth rectangular coordinate system (18) is established on the end surface of the volute (8) with the center of the air inlet as the origin, the direction of the air outlet (17) is in the same direction as the longitudinal axis of the fourth rectangular coordinate system (18), the longitudinal axis of the fourth rectangular coordinate system (18) is vertically upward, a first square (9), a second square (10), a third square (11), and a fourth square (12) are drawn in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant of the fourth rectangular coordinate system, respectively, one of the vertices of the first square (9), the second square (10), the third square (11), and the fourth square (12) coincides with the origin of the fourth rectangular coordinate system (18), and the first square (9), the second square (10), the third square (11), and the fourth square (12) are respectively drawn in the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant, respectively, 1), an adjacent right-angled side of the fourth square (12) coincides with the horizontal axis of the fourth rectangular coordinate and the vertical axis of the fourth rectangular coordinate; the first square (9), the second square (10), the third square (11), and the fourth square (12) are respectively formed with a first arc (13), a second arc (14), a third arc (15), and a fourth arc (16) as the origin at their corners away from the fourth rectangular coordinate; the adjacent first arcs (13), the second arcs (14), the third arcs (15), and the fourth arcs (16) are respectively tangent to each other; the side lengths of the fourth square (12), the third square (11), the second square (10), and the first square (9) are respectively 58.1, 47.3, 38.4, and 31.3; the fourth arc (16), the third arc (15), the second arc (14), and the first arc (13) are respectively 574.3, 469, 383.4, and 313.6, thereby forming the outer wall of the volute (8).

8. A centrifugal fan according to claim 7, characterized in that: The distance from the side of the air outlet (17) away from the origin of the fourth rectangular coordinate system (18) to the origin of the fourth rectangular coordinate system (18) is 622.4, the width of the air outlet (17) along the plane where the fourth rectangular coordinate system (18) is located is 436.1, and the distance from the end of the air outlet (17) of the volute (8) to the fourth arc (16) is 350.7.

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