Racemizer, mixed-flow fan and air conditioner

Abstract

The present invention relates to a swirler, a mixed-flow fan and an air conditioner. The swirler includes a wheel cover (10), a hub (20), a first blade (30) and a second blade (40). The wheel cover (10) has a through cavity, the hub (20) is arranged in the cavity, and a flow passage (50) is formed between the hub (20) and the cavity wall. The first blade (30) and the second blade (40) are arranged in the flow passage (50) in the front and rear directions along the air flow direction. The first blade (30) and the second blade (40) are configured to guide the air flow flowing through the flow passage (50) to flow out in a direction deviating from the axis of the swirler, and the flow guiding capabilities of the first blade (30) and the second blade (40) are different. The swirler of the present invention includes a first blade and a second blade arranged in the flow passage in the front and rear directions along the air flow direction, which can guide the air flow flowing through the flow passage to flow out in a direction deviating from the axis of the swirler, eliminate the circumferential velocity of the air flow as much as possible, and improve the air supply concentration.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and particularly to a swirler, a mixed-flow fan, and an air conditioner. Background Art

[0002] In order to improve the quality and comfort of air conditioners, it is necessary to match appropriate fans according to different requirements and models. On the premise of meeting the requirements of air volume and noise, in order to achieve high-static-pressure air supply, mixed-flow fans are currently often used for air supply in air conditioners.

[0003] However, the air outlet of the mixed-flow fan itself is inclined, and the air supply is not concentrated, which seriously affects the wind speed distribution and heat transfer performance on the surface of the heat exchanger inside the air conditioner, and the required aerodynamic performance cannot be achieved only by optimizing the mixed-flow fan.

[0004] It should be noted that the information disclosed in the background art part of the present invention is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] Embodiments of the present invention provide a swirler, a mixed-flow fan, and an air conditioner to improve the concentration of air supply.

[0006] According to one aspect of the present invention, a swirler is provided, including:

[0007] A wheel cover having a through cavity;

[0008] A hub disposed in the cavity and forming a flow channel between the hub and the cavity wall;

[0009] A first blade and a second blade are arranged in the flow channel in the front and rear directions of the air flow. The first blade and the second blade are configured to guide the air flow flowing through the flow channel to flow out in a direction deviating from the axis of the swirler, and the flow guiding capabilities of the first blade and the second blade are different.

[0010] In some embodiments, both the first blade and the second blade are connected between the outer wall of the hub and the cavity wall.

[0011] In some embodiments, the first blade is disposed upstream of the second blade, and the axial flow guiding capability of the first blade is greater than that of the second blade.

[0012] In some embodiments, the first blade is disposed upstream of the second blade, and the blade profile bend angle of the first blade is greater than that of the second blade.

[0013] In some embodiments, the first blade is disposed upstream of the second blade, and the outlet installation angle of the first blade is less than that of the second blade.

[0014] In some embodiments, the intersection point of the axis of the racemizer and the inlet end face of the racemizer is point O1. The projection of the trailing edge point on the intersection surface of the first vane and the outer wall of the hub on the inlet end face of the racemizer is point A. The connection line between point O1 and point A is the first connection line. The projection of the leading edge point on the intersection surface of the second vane and the outer wall of the hub on the inlet end face of the racemizer is point B. The connection line between point O1 and point B is the second connection line. There is a first included angle between the first connection line and the second connection line.

[0015] In some embodiments, the first included angle is 5° to 20°.

[0016] In some embodiments, the intersection point of the axis of the racemizer and the inlet end face of the racemizer is point O1. The projection of the trailing edge point on the intersection surface of the first vane and the outer wall of the hub on the inlet end face of the racemizer is point C. The connection line between point O1 and point C is the third connection line. The connection line of all the leading edge points of the first vane from the end close to the hub to the end far from the hub is a straight line. There is a second included angle between this straight line and the third connection line.

[0017] In some embodiments, the second included angle is -5° to 5°.

[0018] In some embodiments, the intersection point of the axis of the racemizer and the inlet end face of the racemizer is point O1. The projection of the leading edge point on the intersection surface of the second vane and the outer wall of the hub on the inlet end face of the racemizer is point B. The connection line between point O1 and point B is the second connection line. The connection line of all the leading edge points of the second vane from the end close to the hub to the end far from the hub is a straight line. There is a third included angle between this straight line and the second connection line.

[0019] In some embodiments, the third included angle is -3° to 3°.

[0020] In some embodiments, the intersection point of the axis of the racemizer and the outlet end face of the racemizer is point O2. The projection of the trailing edge point on the intersection surface of the first vane and the outer wall of the hub on the inlet end face of the racemizer is point D. The connection line between point O2 and point D is the fourth connection line. The connection line of all the trailing edge points of the first vane from the end close to the hub to the end far from the hub is a straight line. There is a fourth included angle between this straight line and the fourth connection line.

[0021] In some embodiments, the fourth included angle is -16° to 16°.

[0022] In some embodiments, the intersection point of the axis of the racemizer and the outlet end face of the racemizer is point O2. The projection of the trailing edge point on the intersection surface of the second vane and the outer wall of the hub on the inlet end face of the racemizer is point E. The connection line between point O2 and point E is the fifth connection line. The connection line of all the trailing edge points of the second vane from the end close to the hub to the end far from the hub is a straight line. There is a fifth included angle between this straight line and the fifth connection line.

[0023] In some embodiments, the fifth included angle is -10° to 10°.

[0024] In some embodiments, the number of the first blades and the second blades is 12 to 18.

[0025] In some embodiments, the number of both the first blades and the second blades is 15.

[0026] According to another aspect of the present invention, there is provided a mixed-flow fan, including a fan main body and the above-mentioned swirler, and the swirler is arranged at the air outlet of the fan main body.

[0027] According to still another aspect of the present invention, there is provided an air conditioner, including the above-mentioned swirler or the above-mentioned mixed-flow fan.

[0028] Based on the above technical solutions, the swirler embodiment of the present invention includes a first blade and a second blade arranged in the flow channel in the front-back direction along the air flow direction, which can guide the air flow flowing through the flow channel to flow out along the direction deviating from the axis of the swirler, eliminate the circumferential velocity of the air flow as much as possible, and improve the air supply concentration; at the same time, through the two-stage guiding actions of the first blade and the second blade, the flow velocity and the flow direction of the air flow can be gradually adjusted, avoiding serious flow separation caused by sudden change of the blade profile, and being beneficial to effectively controlling the unsteady flow separation of various upstream incoming flows. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention. In the drawings:

[0030] Figure 1 is a schematic structural diagram of an embodiment of the swirler of the present invention.

[0031] Figure 2 is a schematic structural diagram of a hub, a first blade and a second blade in an embodiment of the swirler of the present invention.

[0032] Figure 3 is a longitudinal sectional view of an embodiment of the swirler of the present invention.

[0033] Figure 4 is a schematic structural diagram of a first blade and a second blade in an embodiment of the swirler of the present invention.

[0034] Figure 5 is a locus diagram of a first mean camber line in an embodiment of the swirler of the present invention.

[0035] Figure 6 is a locus diagram of a second mean camber line in an embodiment of the swirler of the present invention.

[0036] Figure 7 This is a schematic structural view of an embodiment of the racemizer of the present invention as viewed from the inlet end face along the gas flow direction.

[0037] Figure 8 This is a schematic structural view of an embodiment of the racemizer of the present invention as viewed from the outlet end face along the reverse direction of the gas flow.

[0038] Figure 9 This is a schematic view of the contour line of the wheel cover in an embodiment of the racemizer of the present invention.

[0039] Figure 10 This is a schematic view of the contour line of the hub in an embodiment of the racemizer of the present invention.

[0040] Figure 11 and Figure 12 are the vorticity diagrams of the reference racemizer example and the racemizer embodiment of the present invention respectively.

[0041] In the figure:

[0042] 10. Wheel cover; 11. Wheel cover contour line; 20. Hub; 21. Hub contour line; 30. First blade; 31. First mid-arc line; 40. Second blade; 41. Second mid-arc line; 50. Flow channel; 51. Inlet; 52. Outlet; 53. Central locus line; 60. Axis. Detailed implementation manners

[0043] Next, the technical solutions in the embodiments 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 the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "transverse", "longitudinal", "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present invention.

[0045] Reference Figures 1 - 3As shown, in an embodiment of the de-rotator provided by the present invention, the de-rotator includes a wheel cover 10, a hub 20, a first vane 30 and a second vane 40. The wheel cover 10 has a through cavity, the hub 20 is disposed in the cavity, and a flow channel 50 is formed between the hub 20 and the cavity wall. The first vane 30 and the second vane 40 are arranged in the flow channel 50 in the front and rear directions along the air flow direction. The first vane 30 and the second vane 40 are configured to guide the air flow flowing through the flow channel 50 to flow out in a direction deviating from the axis of the de-rotator, and the flow guiding capabilities of the first vane 30 and the second vane 40 are different.

[0046] In this embodiment, the de-rotator includes a first vane 30 and a second vane 40 arranged in the flow channel 50 in the front and rear directions along the air flow direction, which can guide the air flow flowing through the flow channel 50 to flow out in a direction deviating from the axis of the de-rotator, eliminate the circumferential velocity of the air flow as much as possible, and improve the air supply concentration. At the same time, through the two-stage flow guiding effects of the first vane 30 and the second vane 40, the flow velocity and flow direction of the air flow can be gradually adjusted, avoiding serious flow separation caused by sudden changes in blade profiles, and being beneficial to the effective unsteady flow separation control of various upstream incoming flows.

[0047] In this embodiment, the first vane 30 and the second vane 40 are arranged along the axis direction of the de-rotator, and the first vane 30 is located upstream of the second vane 40. As Figure 3 shown, the flow channel 50 includes an inlet 51 and an outlet 52, and the first vane 30 is closer to the inlet 51 than the second vane 40. When applying the de-rotator embodiment to a fan, the first vane 30 is closer to the air outlet of the fan than the second vane 40.

[0048] In some embodiments, the numbers of both the first vane 30 and the second vane 40 are multiple, and the multiple first vanes 30 are evenly arranged in the circumferential direction of the flow channel 50, and the multiple second vanes 40 are evenly arranged in the circumferential direction of the flow channel 50.

[0049] The specific numbers of the first vane 30 and the second vane 40 can be flexibly selected according to needs. The numbers of the first vane 30 and the second vane 40 can be the same or different.

[0050] In the embodiment as Figure 1 shown, the numbers of both the first vane 30 and the second vane 40 are 15. In other embodiments, the numbers of the first vane 30 and the second vane 40 can be 12 to 18.

[0051] Further, the first blade 30 and the second blade 40 can be connected between the outer wall of the hub 20 and the wall of the cavity. One end of the first blade 30 is connected to the outer wall of the hub 20, and the other end of the first blade 30 is connected to the wall of the cavity; one end of the second blade 40 is connected to the outer wall of the hub 20, and the other end of the second blade 40 is connected to the wall of the cavity. Such an arrangement can improve the flow guiding effect.

[0052] The first blade 30 can be arranged upstream of the second blade 40, and the axial flow guiding ability of the first blade 30 is greater than that of the second blade 40. Such an arrangement can make the air flow gradually stable during the flowing process and make the outlet air flow more concentrated.

[0053] In order to achieve a better flow guiding effect on the air flow in the flow channel 50, the blade profile bend angle of the first blade 30 is greater than that of the second blade 40.

[0054] The first blade 30 and the second blade 40 (collectively referred to as blades) include a blade root and an outer edge. The blade root is connected to the hub 20, and the outer edge is connected to the wall of the wheel cover 10. In the direction from the blade root to the outer edge, there are different cross-sections at different heights, and each cross-section forms a blade profile line of the blade at that height. The shapes of these blade profile lines can be the same or different.

[0055] The blade profile line includes a leading edge arc, a concave arc, a trailing edge line, and a convex arc that are connected end to end in sequence. The blade profile line is a closed curve. The leading edge arc faces the air inlet end of the air flow, and the trailing edge arc faces the air outlet end of the air flow. The connection line of the centers of the inscribed small circles of the blade profile line is the middle arc line of the blade profile line. The intersection point of the middle arc line of the blade profile line and the leading edge arc is the leading edge point, and the intersection point of the middle arc line of the blade profile line and the trailing edge arc is the trailing edge point.

[0056] In some embodiments, the blade profile lines intercepted by different cross-sections of the first blade 30 and the second blade 40 in the direction from the blade root to the outer edge are all the same.

[0057] As Figure 4 shown, the bending degree of the first blade 30 is greater than that of the second blade 40. The blade profile bend angle of the first blade 30 is the included angle θ1 between the tangent line of the first middle arc line 31 of the blade profile line of the first blade 30 at the leading edge point and the tangent line at the trailing edge point, and the blade profile bend angle of the second blade 40 is the included angle θ2 between the tangent line of the second middle arc line 41 of the blade profile line of the second blade 40 at the leading edge point and the tangent line at the trailing edge point, and θ1 > θ2.

[0058] The outlet installation angle of the first blade 30 is the angle σ1 between the tangent of the first mean camber line 31 of the blade profile of the first blade 30 at the trailing edge point and the straight line perpendicular to the air flow direction. The outlet installation angle of the second blade 40 is the angle σ2 between the tangent of the second mean camber line 41 of the blade profile of the second blade 40 at the trailing edge point and the straight line perpendicular to the air flow direction, and σ1 < σ2.

[0059] The angle of the camber of the first blade 30 and the second blade 40 can be 20° to 60°, and the angle of the outlet installation angle can be 50° to 100°.

[0060] The shape of the mean camber line of the blade profile has a direct impact on the overall shape of the blade. There are various implementation methods for the specific formation of the mean camber line.

[0061] In some embodiments, the intersection surface of the first blade 30 and / or the second blade 40 with the shroud 10 forms a blade profile in the longitudinal section passing through the axis 60 of the swirl eliminator, and the equation satisfied by the mean camber line of the blade profile is:

[0062] x = m1 * cos2πt + m2 * cos4πt;

[0063] y = k1 * sin2πt + k2 * sin2πt;

[0064] where m1, m2, k1, and k2 are adjustable parameters, and 0 ≤ t ≤ 1.

[0065] The mean camber line of the blade profile of the first blade 30 and / or the second blade 40 can all be obtained by the above equation. By adjusting the magnitudes of m1, m2, k1, and k2, arcs with different cambers can be obtained.

[0066] As Figure 5 shown is the locus diagram of the first mean camber line 31. As Figure 6 shown is the locus diagram of the second mean camber line 41. The degree of bending of the first mean camber line 31 is greater than that of the second mean camber line 41. When the chord lengths are equal, θ1 > θ2.

[0067] Both the outer edge section and the root section of the blade can adopt the curve of this locus to flexibly adjust the inlet air angle of the blade according to the oncoming flow situation, gradually eliminate the circumferential component velocity of the air flow, avoid severe bending in some areas of the blade, generate local air flow impact and boundary layer separation, and greatly reduce the flow loss; at the same time, make the air flow distribution in the outlet area of the swirl eliminator uniform, eliminate the vortex area, and reduce the vortex noise.

[0068] As Figure 7As shown, the intersection point of the axis 60 of the racemizer and the inlet end face of the racemizer is point O1. The projection of the trailing edge point on the intersection surface of the first blade 30 and the outer wall of the hub 20 on the inlet end face of the racemizer is point A. The connection line between point O1 and point A is the first connection line. The projection of the leading edge point on the intersection surface of the second blade 40 and the outer wall of the hub 20 on the inlet end face of the racemizer is point B. The connection line between point O1 and point B is the second connection line. There is a first included angle between the first connection line and the second connection line.

[0069] The first included angle can be 5° to 20°, such as 5°, 10°, 11°, 15°, 20°, etc.

[0070] The intersection point of the axis 60 of the racemizer and the inlet end face of the racemizer is point O1. The projection of the trailing edge point on the intersection surface of the first blade 30 and the outer wall of the hub 20 on the inlet end face of the racemizer is point C. The connection line between point O1 and point C is the third connection line. The connection line of all the leading edge points of the first blade 30 from the end close to the hub 20 to the end far from the hub 20 is a straight line. There is a second included angle between this straight line and the third connection line.

[0071] The second included angle can be -5° to 5°, such as -5°, -3°, -1°, 1°, 3°, 5°, etc. A negative number indicates that the third connection line is on the other side of the above straight line.

[0072] The intersection point of the axis 60 of the racemizer and the inlet end face of the racemizer is point O1. The projection of the leading edge point on the intersection surface of the second blade 40 and the outer wall of the hub 20 on the inlet end face of the racemizer is point B. The connection line between point O1 and point B is the second connection line. The connection line of all the leading edge points of the second blade 40 from the end close to the hub 20 to the end far from the hub 20 is a straight line. There is a third included angle between this straight line and the second connection line.

[0073] The third included angle can be -3° to 3°, such as -3°, -2°, -1°, 1°, 2°, 3°, etc. A negative number indicates that the second connection line is on the other side of the above straight line.

[0074] The intersection point of the axis 60 of the racemizer and the outlet end face of the racemizer is point O2. The projection of the trailing edge point on the intersection surface of the first blade 30 and the outer wall of the hub 20 on the inlet end face of the racemizer is point D. The connection line between point O2 and point D is the fourth connection line. The connection line of all the trailing edge points of the first blade 30 from the end close to the hub 20 to the end far from the hub 20 is a straight line. There is a fourth included angle between this straight line and the fourth connection line.

[0075] The fourth included angle can be -16° to 16°, such as -16°, -12°, -10°, -8°, 8°, 10°, 12°, 16°, etc. A negative number indicates that the fourth connection line is on the other side of the above straight line.

[0076] The intersection point of the axis 60 of the racemizer and the outlet end face of the racemizer is point O2. The projection of the trailing edge point on the intersection surface of the second vane 40 and the outer wall of the hub 20 on the inlet end face of the racemizer is point E. The connection line between point O2 and point E is the fifth connection line. The connection line of all the trailing edge points of the second vane 40 from the end close to the hub 20 to the end far from the hub 20 is a straight line, and there is a fifth included angle between this straight line and the fifth connection line.

[0077] The fifth included angle can be -10° to 10°, such as -10°, -8°, -7°, -5°, 5°, 7°, 8°, 10°, etc. A negative number indicates that the fifth connection line is on the other side of the above straight line.

[0078] The embodiment of the present invention also improves the shape of the flow channel 50 and the outer contour shapes of the wheel cover 10 and the hub 20.

[0079] In some embodiments, as Figure 3 shown, the central locus line 53 of the flow channel 50 in the longitudinal section passing through the axis 60 of the racemizer includes a first locus line M1M2, and the distance between the first locus line M1M2 and the axis 60 of the racemizer increases along the air flow direction.

[0080] Furthermore, the central locus line 53 further includes a second locus line M2M3. The second locus line M2M3 is located downstream of the first locus line M1M2, and the distance between the second locus line M2M3 and the axis 60 of the racemizer decreases along the air flow direction.

[0081] The central locus line 53 includes a first locus line M1M2 and a second locus line M2M3 located downstream of the first locus line M1M2. The distance between the first locus line M1M2 and the axis 60 of the racemizer increases along the air flow direction, and the distance between the second locus line M2M3 and the axis 60 of the racemizer decreases along the air flow direction. In this way, the air flow flowing through the flow channel 50 can be guided, so that the air flow is more biased towards the axis direction of the racemizer when flowing out, the circumferential component velocity of the air flow is eliminated as much as possible, the outlet wind pressure head is increased, and the air supply performance is improved.

[0082] The central locus line 53 here refers to the reference line formed by the midpoints of the connection lines between the corresponding points of the projection lines of the cavity wall of the inner cavity of the wheel cover 10 and the projection lines of the outer wall of the hub 20 in the longitudinal section.

[0083] The first locus line M1M2 includes at least one of a straight line, a spline curve, and a Bezier curve; and / or, the second locus line M2M3 includes at least one of a straight line, a spline curve, and a Bezier curve.

[0084] The first locus line M1M2 can be a straight line segment, a spline curve segment, or a Bezier curve segment, or any combination of two of the straight line segment, the spline curve segment, and the Bezier curve segment, or different combinations of the three line segments of the straight line segment, the spline curve segment, and the Bezier curve segment.

[0085] The second locus line M2M3 can be a straight line segment, a spline curve segment, or a Bezier curve segment, or any combination of two of the straight line segment, the spline curve segment, and the Bezier curve segment, or different combinations of the three line segments of the straight line segment, the spline curve segment, and the Bezier curve segment.

[0086] The central locus line 53 further includes a straight line segment M3M4 located downstream of the second locus line.

[0087] The straight line segment M3M4 gradually approaches the axis 60 of the swirl eliminator along the air flow direction. Such a setting can further concentrate the air flow towards the middle and improve the concentration of the air supply.

[0088] The outlet section of the flow channel 50 is in a flared shape. Such a setting can achieve the purpose of decelerating and increasing the pressure, effectively improving the fan head and achieving a good anti-static pressure effect.

[0089] As Figure 9 shown, the projection of the wheel cover 10 on the longitudinal section passing through the axis 60 of the swirl eliminator forms a wheel cover contour line 11. The wheel cover contour line 11 includes a second curve segment, and the distance between the second curve segment and the axis 60 of the swirl eliminator first increases and then decreases.

[0090] The wheel cover contour line 11 further includes a second straight line segment located downstream of the second curve segment. The distance between the second straight line segment and the axis 60 of the swirl eliminator remains unchanged along the air flow direction.

[0091] As Figure 10 shown, the projection of the hub 20 on the longitudinal section passing through the axis 60 of the swirl eliminator forms a hub contour line 21. The hub contour line 21 includes a first curve segment, and the distance between the first curve segment and the axis 60 of the swirl eliminator first increases and then decreases.

[0092] The hub contour line 21 further includes a first straight line segment located downstream of the first curve segment. The distance between the first straight line segment and the axis 60 of the swirl eliminator gradually decreases along the air flow direction.

[0093] The curvature of the first curve segment and the curvature of the second curve segment can be the same or different. In the embodiment as Figure 3 shown, the curvature of the first curve segment is less than the curvature of the second curve segment.

[0094] The included angle between the first straight line segment and the axis 60 of the de-rotator is 15° to 20°, such as 15°, 18°, 20°, etc. The ratio of the length of the first straight line segment to the length of the second straight line segment is 2 to 4.

[0095] In some embodiments, in the axial direction of the de-rotator, the hub 20 includes a portion extending outside the cavity of the wheel cover 10. Such a setting can enable the air flow to still flow along the outer contour of the hub 20 under the action of inertia after flowing out of the cavity, and can further concentrate the air flow towards the middle.

[0096] As Figure 11 shown, it is the vorticity diagram of the de-rotator example before the structural improvement of the de-rotator embodiment provided by the present invention.

[0097] After the structural improvement of the de-rotator embodiment provided by the present invention, it is set that the blade camber angle θ1 corresponding to the blade profile trace line of the outer edge and the root section of the first blade 30 is 69°, the outlet installation angle σ1 is 32°, and the corresponding chord length is 23.46 mm; the blade camber angle θ2 corresponding to the blade profile trace line of the outer edge and the root section of the second blade 40 is 79°, the outlet installation angle σ2 is 15°, and the corresponding chord length is 18.83 mm. Then, each parameter value of the trace line equation is adjusted to obtain the vorticity diagram as Figure 12 shown.

[0098] Figure 11 And Figure 12 The blocks in represent the vortex cluster regions, and the darker the color, the smaller the eddy current velocity. Through the comparison results, it can be seen that after the structural improvement of the de-rotator provided by the present invention, the covered area of the vortex cluster is significantly reduced, indicating that the eddy current is reduced under the same scale. In particular, the high-speed vortex region at the inlet of the de-rotator is weakened, and there are only partial vortex regions at the leading edge and trailing edge of the blades. The air volume, efficiency, and head of the mixed-flow fan have all increased, and the aerodynamic performance and wind noise level of the fan have been significantly improved.

[0099] Through the description of multiple embodiments of the de-rotator of the present invention, it can be seen that the de-rotator embodiment of the present invention can eliminate the circumferential component velocity of the air flow at the outlet of the mixed-flow fan through reasonable optimization of the structure of the de-rotator. When the air flow passes through the mixed-flow fan, the flow direction gradually changes from circumferential to oblique, improving the air supply concentration; improving the air supply conditions, optimizing the high-speed air outlet area, reducing excessive flow losses, reducing eddy current noise and discrete noise; by improving the shape of the flow channel, optimizing the flow condition, realizing uniform air volume distribution on the surface of the air conditioner heat exchanger, improving the flow efficiency and head, and ensuring strong anti-static pressure ability.

[0100] Based on the above de-rotator, the present invention also proposes a mixed-flow fan, which includes the above de-rotator.

[0101] Based on the above-mentioned mixed-flow fan, the present invention further provides an air conditioner, which includes the above-mentioned de-rotator or mixed-flow fan.

[0102] The positive technical effects of the de-rotator in the above-mentioned various embodiments are equally applicable to the mixed-flow fan and the air conditioner, and will not be elaborated here.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that without departing from the principle of the present invention, modifications can still be made to the specific implementation manners of the present invention or equivalent replacements can be made to some technical features, and these modifications and equivalent replacements should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A racemizer, characterized in that, Comprising: A wheel cover (10) having a through cavity; A wheel hub (20) disposed in the cavity and forming a flow channel (50) between the wheel hub and the cavity wall; A first blade (30) and a second blade (40) arranged in the flow channel (50) in the front - rear direction along the air flow direction. The first blade (30) and the second blade (40) are configured to guide the air flow flowing through the flow channel (50) to flow out in a direction deviating towards the axis of the swirl eliminator. The flow - guiding capabilities of the first blade (30) and the second blade (40) are different. The first blade (30) is disposed upstream of the second blade (40), and the axial flow - guiding capability of the first blade (30) is greater than that of the second blade (40); Wherein, the intersection point of the axis (60) of the swirl eliminator and the inlet end face of the swirl eliminator is point O1. The projection of the trailing edge point on the intersection surface of the first blade (30) and the outer wall of the wheel hub (20) on the inlet end face of the swirl eliminator is point A. The connection line between point O1 and point A is the first connection line. The projection of the leading edge point on the intersection surface of the second blade (40) and the outer wall of the wheel hub (20) on the inlet end face of the swirl eliminator is point B. The connection line between point O1 and point B is the second connection line. There is a first included angle between the first connection line and the second connection line, and the first included angle is 5° - 20°.

2. The racemizer according to claim 1, characterized in that, Both the first blade (30) and the second blade (40) are connected between the outer wall of the wheel hub (20) and the cavity wall.

3. The racemizer according to claim 1, characterized in that, The first blade (30) is disposed upstream of the second blade (40), and the camber angle of the first blade (30) is greater than that of the second blade (40).

4. The racemizer according to claim 1, characterized in that, The first blade (30) is disposed upstream of the second blade (40), and the outlet installation angle of the first blade (30) is less than that of the second blade (40).

5. The racemizer according to claim 1, characterized in that, The intersection point of the axis (60) of the swirl eliminator and the inlet end face of the swirl eliminator is point O1. The projection of the trailing edge point on the intersection surface of the first blade (30) and the outer wall of the wheel hub (20) on the inlet end face of the swirl eliminator is point C. The connection line between point O1 and point C is the third connection line. The connection line of all the leading edge points of the first blade (30) from the end close to the wheel hub (20) to the end far from the wheel hub (20) is a straight line, and there is a second included angle between this straight line and the third connection line.

6. The racemizer according to claim 5, characterized in that, The second included angle is - 5° - 5°.

7. The racemizer according to claim 1, characterized in that, The intersection point of the axis (60) of the swirl eliminator and the inlet end face of the swirl eliminator is point O1. The projection of the leading edge point on the intersection surface of the second blade (40) and the outer wall of the wheel hub (20) on the inlet end face of the swirl eliminator is point B. The connection line between point O1 and point B is the second connection line. The connection line of all the leading edge points of the second blade (40) from the end close to the wheel hub (20) to the end far from the wheel hub (20) is a straight line, and there is a third included angle between this straight line and the second connection line.

8. The racemizer according to claim 7, characterized in that, The third included angle is - 3° - 3°.

9. The racemizer according to claim 1, wherein The intersection point of the axis (60) of the swirler and the outlet end face of the swirler is point O2. The projection of the trailing edge point on the intersection surface of the first blade (30) and the outer wall of the hub (20) on the inlet end face of the swirler is point D. The connection line between point O2 and point D is the fourth connection line. The connection line of all the trailing edge points of the first blade (30) from the end close to the hub (20) to the end far from the hub (20) is a straight line, and there is a fourth included angle between this straight line and the fourth connection line.

10. The racemizer according to claim 9, wherein, The fourth included angle is -16° to 16°.

11. The racemizer according to claim 1, characterized in that, The intersection point of the axis (60) of the swirler and the outlet end face of the swirler is point O2. The projection of the trailing edge point on the intersection surface of the second blade (40) and the outer wall of the hub (20) on the inlet end face of the swirler is point E. The connection line between point O2 and point E is the fifth connection line. The connection line of all the trailing edge points of the second blade (40) from the end close to the hub (20) to the end far from the hub (20) is a straight line, and there is a fifth included angle between this straight line and the fifth connection line.

12. The racemizer according to claim 11, wherein The fifth included angle is -10° to 10°.

13. The racemizer according to claim 1, characterized in that, The number of the first blades (30) and the second blades (40) is 12 to 18.

14. The racemizer according to claim 1, wherein, The number of both the first blades (30) and the second blades (40) is 15.

15. A mixed-flow fan, characterized in that, It includes a fan main body and the swirler according to any one of claims 1 to 14, and the swirler is arranged at the air outlet of the fan main body.

16. An air conditioner, characterized in that, It includes the swirler according to any one of claims 1 to 14 or the mixed-flow fan according to claim 15.

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