Derotators, mixed flow fans and air conditioners

Abstract

The present invention relates to a derotator, a mixed flow fan and an air conditioner, wherein the derotator comprises a wheel cover (10), a wheel hub (20) and blades, the wheel cover (10) has a through cavity, the wheel hub (20) is arranged in the cavity, and a flow channel (50) is formed between the wheel hub (20) and the cavity wall of the cavity, the blades are arranged in the flow channel and are used to guide the airflow flowing through the flow channel to flow out in a direction deviated from the axis of the derotator, wherein the central trajectory line (53) of the flow channel (50) on the longitudinal section passing through the axis (60) of the derotator comprises a first trajectory line and a second trajectory line, the distance between the first trajectory line and the axis (60) of the derotator increases along the flow direction of the airflow, the second trajectory line is located downstream of the first trajectory line, and the distance between the second trajectory line and the axis (60) of the derotator decreases along the flow direction of the airflow. The derotator of the present invention can improve the air supply performance and increase the outlet air pressure head.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a derotator, 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 needs and models. Under 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 conditioning air supply.

[0003] However, the mixed flow fan itself has an inclined air outlet and unconcentrated air supply, which seriously affects the wind speed distribution and heat exchange performance on the surface of the heat exchanger inside the air conditioner, and the required aerodynamic performance cannot be achieved by optimizing the mixed flow fan alone.

[0004] It should be noted that the information disclosed in the background technology section 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 acknowledging or suggesting in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0005] The embodiments of the present invention provide a derotator, a mixed flow fan and an air conditioner, which improve the centralization of air supply.

[0006] According to one aspect of the present invention, there is provided a racemizer, comprising:

[0007] A wheel cover having a through cavity;

[0008] A hub is disposed in the cavity and forms a flow channel with a cavity wall of the cavity; and

[0009] The blades are arranged in the flow channel and used to guide the airflow flowing through the flow channel to flow out in a direction deviated from the axis of the derotator;

[0010] Among them, the central trajectory line of the flow channel on the longitudinal section passing through the axis of the cyclone includes a first trajectory line and a second trajectory line, the distance between the first trajectory line and the axis of the cyclone increases along the flow direction of the airflow, the second trajectory line is located downstream of the first trajectory line, and the distance between the second trajectory line and the axis of the cyclone decreases along the flow direction of the airflow.

[0011] In some embodiments, the first trajectory line includes at least one of a straight line, a spline curve, and a Bezier curve; and / or the second trajectory line includes at least one of a straight line, a spline curve, and a Bezier curve.

[0012] In some embodiments, the central trajectory further includes a straight line segment downstream of the second trajectory.

[0013] In some embodiments, the straight segment gradually approaches the axis of the derotator along the flow direction of the gas flow.

[0014] In some embodiments, the projection of the intersection surface of the blade and the wheel cover on the longitudinal section through the axis of the derotator forms a blade profile, and the equation satisfied by the camber line of the blade profile is:

[0015] x=m1*cos(2πt)+m2*cos(4πt);

[0016] y=k1*sin(2πt)+k2*sin(2πt);

[0017] Among them, m1, m2, k1 and k2 are adjustable parameters, 0≤t≤1.

[0018] In some embodiments, the outlet section of the flow channel is flared.

[0019] In some embodiments, a projection of the hub on a longitudinal section passing through the axis of the derotator forms a hub contour line, and the hub contour line includes a first curved segment, and a distance between the first curved segment and the axis of the derotator first increases and then decreases.

[0020] In some embodiments, the hub contour line further includes a first straight line segment, the first straight line segment is located downstream of the first curved line segment, and the distance between the first straight line segment and the axis of the derotator gradually decreases along the flow direction of the airflow.

[0021] In some embodiments, a projection of the wheel cover on a longitudinal section passing through the axis of the derotator forms a wheel cover contour line, and the wheel cover contour line includes a second curved segment, and a distance between the second curved segment and the axis of the derotator first increases and then decreases.

[0022] In some embodiments, the wheel cover contour line further includes a second straight line segment, the second straight line segment is located downstream of the second curved line segment, and the distance between the second straight line segment and the axis of the derotator remains unchanged along the airflow direction.

[0023] In some embodiments, the projection of the wheel cover on the longitudinal section passing through the axis of the derotator forms a wheel cover contour line, and the wheel cover contour line includes a second curve segment, and the distance between the second curve segment and the axis of the derotator first increases and then decreases, and the curvature of the first curve segment is less than or equal to the curvature of the second curve segment.

[0024] In some embodiments, the hub includes a portion extending out of the cavity of the wheel cover in the axial direction of the derotator.

[0025] According to another aspect of the present invention, there is provided a mixed flow fan, comprising a fan body and the above-mentioned derotator, wherein the derotator is arranged at the air outlet of the fan body.

[0026] According to yet another aspect of the present invention, there is provided an air conditioner comprising the above-mentioned derotator or the above-mentioned mixed flow fan.

[0027] Based on the above technical scheme, the central trajectory line of the flow channel of the eliminator embodiment of the present invention on the longitudinal section passing through the axis of the eliminator includes a first trajectory line and a second trajectory line located downstream of the first trajectory line. The distance between the first trajectory line and the axis of the eliminator increases along the flow direction of the airflow, and the distance between the second trajectory line and the axis of the eliminator decreases along the flow direction of the airflow. In this way, the airflow flowing through the flow channel can be guided so that the airflow is more biased toward the axial direction of the eliminator when flowing out, thereby eliminating the circumferential component of the airflow as much as possible, increasing the outlet air pressure head, and improving the air supply performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 It is a schematic structural diagram of an embodiment of the racemizer of the present invention.

[0030] Figure 2 It is a schematic diagram of the structure of the hub, the first blade and the second blade in one embodiment of the derotator of the present invention.

[0031] Figure 3 It is a longitudinal cross-sectional view of an embodiment of the racemizer of the present invention.

[0032] Figure 4 It is a schematic diagram of the structure of the first blade and the second blade in one embodiment of the derotator of the present invention.

[0033] Figure 5 This is a trajectory diagram of the first middle arc in an embodiment of the derotator of the present invention.

[0034] Figure 6 This is a trajectory diagram of the second middle arc in one embodiment of the derotator of the present invention.

[0035] Figure 7 This is a schematic structural diagram of an embodiment of the derotator of the present invention as viewed from the inlet end face along the airflow direction.

[0036] Figure 8 This is a schematic structural diagram of an embodiment of the derotator of the present invention viewed from the outlet end face in the opposite direction of the airflow direction.

[0037] Fig. 9 Schematic diagram of the outline of the wheel cover in one embodiment of the derotator of the present invention.

[0038] Fig.10 Schematic diagram of the outline of the hub in one embodiment of the derotator of the present invention.

[0039] Fig.11 and Fig.12 Vorticity diagrams of a reference decyclone example and a decyclone embodiment of the present invention, respectively.

[0040] In the figure:

[0041] 10. Wheel cover; 11. Wheel cover contour line; 20. Wheel hub; 21. Wheel hub contour line; 30. First blade; 31. First center arc line; 40. Second blade; 41. Second center arc line; 50. Flow channel; 51. Inlet; 52. Outlet; 53. Center trajectory line; 60. Axis. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations 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 understood as limiting the scope of protection of the present invention.

[0044] refer to Figures 1 to 3 As shown, in one embodiment of the de-cyclone provided by the present invention, the de-cyclone includes a wheel cover 10, a wheel hub 20, a first blade 30 and a second blade 40, the wheel cover 10 has a through cavity, the wheel hub 20 is arranged in the cavity, and a flow channel 50 is formed between the wheel hub 20 and the cavity wall of the cavity, the first blade 30 and the second blade 40 are arranged in the flow channel 50 front and back along the flow direction of the airflow, the first blade 30 and the second blade 40 are configured to guide the airflow flowing through the flow channel 50 to flow out in a direction biased toward the axis of the de-cyclone, and the first blade 30 and the second blade 40 have different flow guiding capacities.

[0045] The derotator in this embodiment includes a first blade 30 and a second blade 40 arranged in the flow channel 50 front and back along the flow direction of the airflow, which can guide the airflow flowing through the flow channel 50 to flow out in the direction of the axis of the derotator, thereby eliminating the circumferential velocity of the airflow as much as possible and improving the centralization of the air supply; at the same time, through the double guiding effects of the first blade 30 and the second blade 40, the flow velocity and flow direction of the airflow can be gradually adjusted to avoid serious flow separation caused by sudden changes in blade shape, which is conducive to effective unsteady flow separation control of multiple upstream incoming flows.

[0046] In this embodiment, the first blade 30 and the second blade 40 are arranged along the axial direction of the derotator, and the first blade 30 is located upstream of the second blade 40. Figure 3 As shown, the flow channel 50 includes an inlet 51 and an outlet 52, and the first blade 30 is closer to the inlet 51 than the second blade 40. When the derotator embodiment is applied to a fan, the first blade 30 is closer to the air outlet of the fan than the second blade 40.

[0047] In some embodiments, the number of the first blades 30 and the number of the second blades 40 are both plural, the plurality of first blades 30 are evenly arranged along the circumference of the flow channel 50 , and the plurality of second blades 40 are evenly arranged along the circumference of the flow channel 50 .

[0048] The specific number of the first blades 30 and the second blades 40 can be flexibly selected according to needs. The number of the first blades 30 and the second blades 40 can be the same or different.

[0049] In such Figure 1 In the illustrated embodiment, the number of the first blades 30 and the number of the second blades 40 are both 15. In other embodiments, the number of the first blades 30 and the second blades 40 may be 12 to 18.

[0050] Further, the first blade 30 and the second blade 40 can be connected between the outer wall of the hub 20 and the cavity 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 cavity wall; 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 cavity wall of the cavity. This arrangement can improve the flow diversion effect.

[0051] The first blade 30 may be arranged upstream of the second blade 40, and the axial flow guiding capability of the first blade 30 is greater than the axial flow guiding capability of the second blade 40. This arrangement can gradually stabilize the airflow during the flow process, making the outlet airflow more concentrated.

[0052] In order to achieve a better guiding effect on the airflow in the flow channel 50 , the blade angle of the first blade 30 is greater than the blade angle of the second blade 40 .

[0053] The first blade 30 and the second blade 40 (collectively referred to as blades) include a blade root and an outer edge, wherein the blade root is connected to the hub 20, and the outer edge is connected to the cavity wall of the wheel cover 10. In the direction from the blade root to the outer edge, different heights have different cross sections, and each cross section forms a blade profile of the blade at the height, and the shapes of these blade profiles can be the same or different.

[0054] The blade profile includes a leading edge arc line, a concave arc line, a trailing edge line and a convex arc line connected end to end. The blade profile is a closed curve. The leading edge arc line faces the air inlet end of the airflow, and the trailing edge arc line faces the air outlet end of the airflow. The line connecting the centers of the inscribed small circles of the blade profile is the middle arc line of the blade profile. The intersection of the middle arc line of the blade profile and the leading edge arc line is the leading edge point, and the intersection of the middle arc line of the blade profile and the trailing edge arc line is the trailing edge point.

[0055] In some embodiments, the blade profiles of the first blade 30 and the second blade 40 obtained by cutting different cross sections in the direction from the blade root to the outer edge are the same.

[0056] like Figure 4 As shown, the curvature of the first blade 30 is greater than that of the second blade 40. The blade profile angle of the first blade 30 is the angle θ1 between the tangent line of the first mid-camber line 31 of the blade profile of the first blade 30 at the leading edge point and the tangent line at the trailing edge point, and the blade profile angle of the second blade 40 is the angle θ2 between the tangent line of the second mid-camber line 41 of the blade profile of the second blade 40 at the leading edge point and the tangent line at the trailing edge point, θ1>θ2.

[0057] The outlet installation angle of the first blade 30 is the angle σ1 between the tangent of the first mid-arc line 31 of the blade profile of the first blade 30 at the trailing edge point and the straight line perpendicular to the airflow direction. The outlet installation angle of the second blade 40 is the angle σ2 between the tangent of the second mid-arc line 41 of the blade profile of the second blade 40 at the trailing edge point and the straight line perpendicular to the airflow direction, σ1<σ2.

[0058] The blade profile bending angles of the first blade 30 and the second blade 40 may be 20° to 60°, and the outlet installation angle may be 50° to 100°.

[0059] The shape of the camber line of the blade profile has a direct impact on the overall shape of the blade. The specific formation of the camber line can be realized in many ways.

[0060] In some embodiments, the projection of the intersection surface of the first blade 30 and / or the second blade 40 with the wheel cover 10 on the longitudinal section through the axis 60 of the derotator forms a blade profile, and the mid-camber line of the blade profile satisfies the equation:

[0061] x=m1*cos2πt+m2*cos4πt;

[0062] y=k1*sin2πt+k2*sin2πt;

[0063] Among them, m1, m2, k1 and k2 are adjustable parameters, 0≤t≤1.

[0064] The median camber lines of the blade profiles of the first blade 30 and / or the second blade 40 can be obtained by using the above equations. By adjusting the values ​​of m1, m2, k1 and k2, camber lines with different curvatures can be obtained.

[0065] like Figure 5 The trajectory diagram of the first middle arc line 31 is shown as follows: Figure 6 The figure shows the trajectory of the second median arc 41. The curvature of the first median arc 31 is greater than that of the second median arc 41. When the chord lengths are equal, θ1>θ2.

[0066] The outer edge section and the root section of the blade can both adopt this trajectory curve to flexibly adjust the blade inlet angle according to the incoming flow conditions, gradually eliminate the circumferential component of the airflow, avoid severe bending of some areas of the blade, produce local airflow impact and boundary layer separation, and greatly reduce flow losses; at the same time, make the airflow in the outlet area of ​​the derotator evenly distributed, eliminate the vortex area, and reduce vortex noise.

[0067] like Figure 7 As shown, the intersection of the axis 60 of the de-rotator and the inlet end face of the de-rotator 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 de-rotator is point A, the line between point O1 and point A is the first 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 de-rotator is point B, the line between point O1 and point B is the second line, and there is a first angle between the first line and the second line.

[0068] The first angle may be 5° to 20°, such as 5°, 10°, 11°, 15°, 20°, etc.

[0069] The intersection of the axis 60 of the derotator and the inlet end face of the derotator 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 derotator is point C, the line between point O1 and point C is the third line, and the line connecting 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, and there is a second angle between the straight line and the third line.

[0070] The second angle may be -5° to 5°, such as -5°, -3°, -1°, 1°, 3°, 5°, etc. A negative number indicates that the third connecting line is located on the other side of the above straight line.

[0071] The intersection of the axis 60 of the derotator and the inlet end face of the derotator 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 derotator is point B, the line between point O1 and point B is the second line, and the line connecting 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, and there is a third angle between the straight line and the second line.

[0072] The third angle may be -3° to 3°, such as -3°, -2°, -1°, 1°, 2°, 3°, etc. A negative number indicates that the second connecting line is located on the other side of the straight line.

[0073] The intersection of the axis 60 of the eliminator and the outlet end face of the eliminator 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 eliminator is point D, the line between point O2 and point D is the fourth line, and the line connecting 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 angle between the straight line and the fourth line.

[0074] The fourth angle may be -16° to 16°, such as -16°, -12°, -10°, -8°, 8°, 10°, 12°, 16°, etc. A negative number indicates that the fourth connecting line is located on the other side of the straight line.

[0075] The intersection of the axis 60 of the eliminator and the outlet end face of the eliminator 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 eliminator is point E, the line between point O2 and point E is the fifth line, and the line connecting 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 angle between the straight line and the fifth line.

[0076] The fifth angle may be -10° to 10°, such as -10°, -8°, -7°, -5°, 5°, 7°, 8°, 10°, etc. A negative number indicates that the fifth connecting line is located on the other side of the above straight line.

[0077] 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 wheel hub 20 .

[0078] In some embodiments, Figure 3 As shown, the central trajectory line 53 of the flow channel 50 on the longitudinal section passing through the axis 60 of the decyclone includes a first trajectory line M1M2, and the distance between the first trajectory line M1M2 and the axis 60 of the decyclone increases along the flow direction of the gas flow.

[0079] Furthermore, the central trajectory 53 also includes a second trajectory M2M3, which is located downstream of the first trajectory M1M2, and the distance between the second trajectory M2M3 and the axis 60 of the derotator decreases along the airflow direction.

[0080] The center trajectory line 53 includes a first trajectory line M1M2 and a second trajectory line M2M3 located downstream of the first trajectory line M1M2. The distance between the first trajectory line M1M2 and the axis 60 of the eliminator increases along the flow direction of the airflow, and the distance between the second trajectory line M2M3 and the axis 60 of the eliminator decreases along the flow direction of the airflow. In this way, the airflow flowing through the flow channel 50 can be guided so that the airflow is more biased toward the axial direction of the eliminator when flowing out, thereby eliminating the circumferential component of the airflow as much as possible, increasing the outlet air pressure head, and improving the air supply performance.

[0081] The center trajectory line 53 here refers to the reference line formed by the midpoints of the lines connecting the corresponding points of the projection line of the inner cavity wall of the wheel cover 10 on the longitudinal section and the outer wall of the wheel hub 20 on the longitudinal section.

[0082] The first trajectory line M1M2 includes at least one of a straight line, a spline curve and a Bezier curve; and / or the second trajectory line M2M3 includes at least one of a straight line, a spline curve and a Bezier curve.

[0083] The first trajectory line M1M2 may be a straight line segment, a spline curve segment, or a Bezier curve segment, or a combination of any two of the straight line segment, the spline curve segment, or the Bezier curve segment, or different combinations of the three line segments.

[0084] The second trajectory line M2M3 can be a straight line segment, a spline curve segment and a Bezier curve segment, or a combination of any two of the straight line segment, spline curve segment and Bezier curve segment, or different combinations of the three line segments.

[0085] The central trajectory line 53 further includes straight line segments M3M4 located downstream of the second trajectory line.

[0086] The straight line segments M3M4 gradually approach the axis 60 of the derotator along the airflow direction. This arrangement can further concentrate the airflow toward the middle, thereby improving the centralization of the air supply.

[0087] The outlet section of the flow channel 50 is in a flared shape. This arrangement can achieve the purpose of reducing speed and expanding pressure, effectively increase the fan pressure head, and achieve a good anti-static pressure effect.

[0088] like Fig. 9As shown, the projection of the wheel cover 10 on the longitudinal section passing through the axis 60 of the derotator forms a wheel cover contour line 11, and the wheel cover contour line 11 includes a second curved segment, and the distance between the second curved segment and the axis 60 of the derotator first increases and then decreases.

[0089] The wheel cover contour line 11 also includes a second straight line segment, which is located downstream of the second curved line segment. The distance between the second straight line segment and the axis 60 of the derotator remains unchanged along the airflow direction.

[0090] like Fig.10 As shown, the projection of the hub 20 on the longitudinal section passing through the axis 60 of the derotator forms a hub contour line 21, and the hub contour line 21 includes a first curved segment, and the distance between the first curved segment and the axis 60 of the derotator first increases and then decreases.

[0091] The hub contour line 21 further includes a first straight line segment, which is located downstream of the first curved line segment. The distance between the first straight line segment and the axis 60 of the derotator gradually decreases along the airflow direction.

[0092] The curvature of the first curve segment and the curvature of the second curve segment may be the same or different. Figure 3 In the illustrated embodiment, the curvature of the first curved segment is smaller than the curvature of the second curved segment.

[0093] The angle between the first straight line segment and the axis 60 of the derotator 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 2-4.

[0094] In some embodiments, the hub 20 includes a portion extending out of the cavity of the wheel cover 10 in the axial direction of the derotator. This arrangement allows the airflow to 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 airflow toward the center.

[0095] like Fig.11 FIG. 1 is a vortex diagram of a reference derotator example before structural improvement is performed on the derotator embodiment provided by the present invention.

[0096] After the structure of the derotator embodiment provided by the present invention is improved, the blade profile trajectory line of the outer edge and root section of the first blade 30 is set to correspond to the blade profile angle θ1=69°, the outlet installation angle σ1=32°, and the corresponding chord length is 23.46mm; the blade profile trajectory line of the outer edge and root section of the second blade 40 corresponds to the blade profile angle θ2=79°, the outlet installation angle σ2=15°, and the corresponding chord length is 18.83mm, and then the values ​​of the parameters of the trajectory equation are adjusted to obtain the following: Fig.12 The vorticity diagram shown.

[0097] Fig.11 and Fig.12 The blocks in the figure represent the vortex area, and the darker the color, the smaller the vortex speed. By comparing the results, it can be seen that after the de-rotator provided by the present invention is used for structural improvement, the vortex coverage area is significantly reduced, indicating that the vortex is reduced at the same scale, especially the high-speed vortex area at the inlet of the de-rotator is weakened, and only some vortex areas remain at the leading and trailing edges of the blades. The air volume, efficiency and pressure head of the mixed flow fan are improved, and the aerodynamic performance and wind noise level of the fan are significantly improved.

[0098] Through the description of multiple embodiments of the derotator of the present invention, it can be seen that the derotator embodiment of the present invention can eliminate the circumferential component velocity of the airflow at the outlet of the mixed flow fan by reasonably optimizing the design of the structure of the derotator. When the airflow passes through the mixed flow fan, the flow direction gradually changes from circumferential to oblique, thereby improving the centralization of air supply; improving air supply conditions, optimizing the high-speed air outlet area, reducing excessive flow losses, and reducing eddy noise and discrete noise; by improving the shape of the flow channel and optimizing the flow conditions, the air volume distribution on the surface of the air conditioner heat exchanger is uniform, the flow efficiency and pressure head are improved, and a strong ability to resist static pressure is ensured.

[0099] Based on the above-mentioned derotator, the present invention further proposes a mixed flow fan, which includes the above-mentioned derotator.

[0100] Based on the above-mentioned mixed flow fan, the present invention further proposes an air conditioner, which includes the above-mentioned derotator or mixed flow fan.

[0101] The positive technical effects of the derotator in the above-mentioned embodiments are also applicable to mixed flow fans and air conditioners, which will not be described in detail here.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that without departing from the principles of the present invention, the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents, and these modifications and equivalent replacements should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A racemizer, characterized in that: include: The wheel cover (10) has a through cavity; A wheel hub (20) is disposed in the cavity and forms a flow channel (50) with a cavity wall of the cavity; and A blade is arranged in the flow channel and is used to guide the airflow flowing through the flow channel to flow out in a direction biased towards the axis of the derotator; the blade comprises a first blade (30) and a second blade (40) arranged in the flow channel (50) in front and behind along the flow direction of the airflow; the first blade (30) is arranged upstream of the second blade (40), the axial flow conduction capacity of the first blade (30) is greater than the axial flow conduction capacity of the second blade (40); the blade profile angle of the first blade (30) is greater than that of the second blade (40); The blade bend angles of the two blades (40); the blade bend angle of the first blade (30) is the angle θ1 between the tangent line of the first mid-camber line (31) of the blade profile of the first blade (30) at the leading edge point and the tangent line at the trailing edge point, and the blade bend angle of the second blade (40) is the angle θ2 between the tangent line of the second mid-camber line (41) of the blade profile of the second blade (40) at the leading edge point and the tangent line at the trailing edge point, wherein θ1>θ2; and both θ1 and θ2 are 20° to 60°; The central trajectory line (53) of the flow channel (50) on a longitudinal section passing through the axis (60) of the decyclone comprises a first trajectory line and a second trajectory line, the distance between the first trajectory line and the axis (60) of the decyclone increasing along the flow direction of the airflow, and the second trajectory line is located downstream of the first trajectory line, and the distance between the second trajectory line and the axis (60) of the decyclone decreasing along the flow direction of the airflow; The outlet installation angle of the first blade (30) is an angle σ1 between a tangent line of the first mid-arc line (31) of the blade profile of the first blade (30) at a trailing edge point and a straight line perpendicular to the airflow direction, and the outlet installation angle of the second blade (40) is an angle σ2 between a tangent line of the second mid-arc line (41) of the blade profile of the second blade (40) at a trailing edge point and a straight line perpendicular to the airflow direction, σ1<σ2; and both σ1 and σ2 are 50° to 100°.

2. The deracinator according to claim 1, characterized in that: The first trajectory line includes at least one of a straight line, a spline curve and a Bezier curve; and / or the second trajectory line includes at least one of a straight line, a spline curve and a Bezier curve.

3. The deracinator according to claim 1, characterized in that: The central trajectory (53) further comprises a straight line segment located downstream of the second trajectory.

4. The deracinator according to claim 3, characterized in that: The straight section gradually approaches the axis (60) of the derotator along the flow direction of the airflow.

5. The deracinator according to claim 1, characterized in that: The projection of the intersection surface of the blade and the wheel cover (10) on the longitudinal section passing through the axis (60) of the derotator forms a blade profile, and the mid-arc line of the blade profile satisfies the equation: x=m1*cos(2πt)+m2*cos(4πt); y=k1*sin(2πt)+k2*sin(2πt); Among them, m1, m2, k1 and k2 are adjustable parameters, 0≤t≤1.

6. The deracinator according to claim 1, characterized in that: The outlet section of the flow channel (50) is in a flared shape.

7. The deracinator according to claim 1, characterized in that: The projection of the hub (20) on a longitudinal section passing through the axis (60) of the de-rotator forms a hub contour line (21), wherein the hub contour line (21) comprises a first curved segment, wherein a distance between the first curved segment and the axis (60) of the de-rotator first increases and then decreases.

8. The derotator according to claim 7, characterized in that The hub contour line (21) further comprises a first straight line segment, the first straight line segment being located downstream of the first curved line segment, and the distance between the first straight line segment and the axis (60) of the derotator gradually decreases along the flow direction of the airflow.

9. The deracinator according to claim 1, characterized in that: The projection of the wheel cover (10) on a longitudinal section passing through the axis (60) of the derotator forms a wheel cover contour line (11), and the wheel cover contour line (11) includes a second curved segment, and the distance between the second curved segment and the axis (60) of the derotator first increases and then decreases.

10. The deracinator according to claim 9, characterized in that The wheel cover contour line (11) further comprises a second straight line segment, the second straight line segment being located downstream of the second curved line segment, and the distance between the second straight line segment and the axis (60) of the derotator remains constant along the airflow direction.

11. The derotator according to claim 7, characterized in that: The projection of the wheel cover (10) on the longitudinal section passing through the axis (60) of the derotator forms a wheel cover contour line (11), and the wheel cover contour line (11) includes a second curved segment, and the distance between the second curved segment and the axis (60) of the derotator first increases and then decreases, and the curvature of the first curved segment is less than or equal to the curvature of the second curved segment.

12. The deracinator according to claim 1, characterized in that In the axial direction of the derotator, the wheel hub (20) includes a portion extending outside the cavity of the wheel cover (10).

13. A mixed flow fan, characterized in that: It comprises a fan body and a derotator as described in any one of claims 1 to 12, wherein the derotator is arranged at the air outlet of the fan body.

14. An air conditioner, characterized in that: It comprises the derotator as described in any one of claims 1 to 12 or the mixed flow fan as described in claim 13.

Images