Fans and air conditioners equipped with them

Abstract

To improve the airflow performance of a fan equipped with multiple main wings and multiple ailerons. [Solution] The fan 24 has a hub 40 with a rotational centerline CL extending in the front-rear direction, a plurality of main wings 42 that are tilted forward in the rotational direction and have a first outer peripheral end 42c, a first trailing edge 42b, and a first leading edge 42a that extends forward from the hub 40 toward the first outer peripheral end 42c and in a spiral curve in the rotational direction, and the same number of ailerons 44 as the main wings 42, each having a second outer peripheral end 44c, a second trailing edge 44b, and a second leading edge 44a that extends forward from the hub 40 toward the second outer peripheral end 44c and in a spiral curve in the rotational direction. The second rotational gradient, which is the ratio of the front-rear length to the rotational length of the second outer peripheral end 44c in the aileron 44, is greater than the first rotational gradient, which is the ratio of the front-rear length to the rotational length of the first outer peripheral end 42c in the main wings 42.

Description

【Technical Field】 【0001】 The present disclosure relates to a fan and an air conditioner including the fan. 【Background Art】 【0002】 Patent Document 1 discloses a fan used in an air conditioner. This fan includes two main blades and two auxiliary blades. Specifically, the main blades and the auxiliary blades are arranged alternately in the rotation direction of the fan, the main blades and the auxiliary blades have a similar shape, and the auxiliary blades are smaller than the main blades. By providing such auxiliary blades, the fan has improved air blowing performance compared to a fan with only two main blades. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2013-83158 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 An object of the present disclosure is to further improve the air blowing performance of a fan including a plurality of main blades and a plurality of auxiliary blades. 【Means for Solving the Problems】 【0005】 In order to solve the above problems, according to one aspect of the present disclosure, a hub having a rotation center line extending in the front-rear direction, a plurality of main blades that are inclined forward in the rotation direction and have a first outer peripheral side end, a first trailing edge, and a first leading edge that extends in a spiral curve shape forward and in the rotation direction from the hub toward the first outer peripheral side end, and a plurality of auxiliary blades that are inclined forward in the rotation direction and have a second outer peripheral side end, a second trailing edge, and a second leading edge that extends in a spiral curve shape forward and in the rotation direction from the hub toward the second outer peripheral side end, and the same number of auxiliary blades as the main blades. The radial length of the aileron is smaller than the radial length of the main wing. The rotational length of the second outer edge of the aileron is smaller than the rotational length of the second outer edge of the main wing. A fan is provided in which a second rotational gradient, which is the ratio of the longitudinal length to the rotational length of the second outer edge of the aileron, is greater than a first rotational gradient, which is the ratio of the longitudinal length to the rotational length of the first outer edge of the main wing. 【0006】 Furthermore, according to another aspect of this disclosure, The aforementioned fans, An air conditioner is provided which includes a heat exchanger positioned opposite the fan. [Effects of the Invention] 【0007】 According to this disclosure, the airflow performance of a fan having multiple main wings and multiple ailerons can be further improved. [Brief explanation of the drawing] 【0008】 [Figure 1] Schematic diagram of an air conditioner according to one embodiment of the present disclosure. [Figure 2] Fan oblique view [Figure 3] Front view of the fan [Figure 4] Side view of the fan [Figure 5] A side view of the fan, seen from a different angle than Figure 4. [Figure 6] A schematic diagram showing multiple airfoil sections of the fin and the airflow. [Figure 7A] Contour diagram showing the velocity distribution behind the main wing of the fan in the embodiment. [Figure 7B] Vector diagram showing the velocity distribution behind the main wing of the fan in the embodiment. [Figure 8A] Contour diagram showing the velocity distribution behind the main wing of the fan in Comparative Example 1. [Figure 8B]Vector diagram showing the velocity distribution behind the main blade of the fan of Comparative Example 1 [Figure 9A] Contour diagram showing the velocity distribution behind the main blade of the fan of Comparative Example 2 [Figure 9B] Vector diagram showing the velocity distribution behind the main blade of the fan of Comparative Example 2 [Figure 10] Diagram showing the relationship between the ratio of the rotational direction gradient of the auxiliary blade to the rotational direction gradient of the main blade and the fan air volume ratio [Figure 11] Diagram showing the relationship between the angle between the trailing edge of the main blade and the leading edge of the auxiliary blade and the fan air volume ratio 【Mode for Carrying Out the Invention】 【0009】 The fan according to one aspect of the present disclosure includes a hub having a rotation center line extending in the front-rear direction, a plurality of main blades that are tilted forward in the rotation direction and have a first outer peripheral side end, a first trailing edge, and a first leading edge that extends in a spiral curve shape forward and in the rotation direction from the hub toward the first outer peripheral side end, and auxiliary blades that are tilted forward in the rotation direction and have a second outer peripheral side end, a second trailing edge, and a second leading edge that extends in a spiral curve shape forward and in the rotation direction from the hub toward the second outer peripheral side end, and have the same number as the main blades. The radial length of the auxiliary blade is smaller than the radial length of the main blade, the rotational direction length of the second outer peripheral side end of the auxiliary blade is smaller than the rotational direction length of the second outer peripheral side end of the main blade, and a second rotational direction gradient, which is the ratio of the rotational direction length to the front-rear direction length of the second outer peripheral side end of the auxiliary blade, is larger than a first rotational direction gradient, which is the ratio of the rotational direction length to the front-rear direction length of the first outer peripheral side end of the main blade. 【0010】 According to such an aspect, the air blowing performance of the fan including a plurality of main blades and a plurality of auxiliary blades can be further improved. 【0011】 For example, preferably, the ratio of the second rotational direction gradient to the first rotational direction gradient is in the range of 1.5 to 2. 【0012】 For example, preferably, a second radial gradient, which is the ratio of the longitudinal length to the radial length in the auxiliary wing, is larger than a first radial gradient, which is the ratio of the longitudinal length to the radial length in the main wing. 【0013】 For example, preferably, in the longitudinal view, the distance in the rotational direction between the first trailing edge of the main wing and the second leading edge of the auxiliary wing is smaller than the distance in the rotational direction between the second trailing edge of the auxiliary wing and the first leading edge of the main wing. 【0014】 For example, preferably, in the longitudinal view, the angle between the first trailing edge of the main wing and the second leading edge of the auxiliary wing is 3 degrees or more. 【0015】 For example, preferably, at the same radial position, the longitudinal length of the main wing is larger than the longitudinal length of the auxiliary wing. 【0016】 An air conditioner according to another aspect of the present disclosure includes the above-described fan and a heat exchanger disposed to face the fan. 【0017】 According to such another aspect, the blowing performance of the fan including a plurality of main wings and a plurality of auxiliary wings can be further improved. As a result, the heat exchange efficiency of the heat exchanger is improved. 【0018】 Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. 【0019】 FIG. 1 is a schematic view of an air conditioner according to an embodiment of the present disclosure. 【0020】 As shown in FIG. 1, an air conditioner 10 according to the present embodiment has an indoor unit 12 disposed indoors and an outdoor unit 14 disposed outdoors. 【0021】 As shown in Figure 1, the indoor unit 12 is equipped with a housing 16 installed indoors, a heat exchanger 18 located inside the housing 16 that exchanges heat with the indoor air, and a cross-flow fan 20 that generates an airflow of indoor air so that the indoor air passes through the heat exchanger 18. When the cross-flow fan 20 rotates, indoor air flows into the housing 16 and passes through the heat exchanger 18. The air that has passed through the heat exchanger 18 is blown out of the housing 16 to the outside. 【0022】 As shown in Figure 1, the outdoor unit 14 is equipped with a heat exchanger 22 that exchanges heat with outdoor air, a fan 24 positioned opposite the heat exchanger 22 and generating an airflow of outdoor air so that outdoor air passes through the heat exchanger 22, and a compressor 26 that delivers the refrigerant (first fluid) that passes through the heat exchangers 18 and 22. The heat exchangers 18, 22, and compressor 26 are connected via refrigerant piping 28. An expansion valve 30 for reducing the pressure of the refrigerant and a four-way valve 32 for changing the direction of the refrigerant flow are located on the refrigerant piping 28. 【0023】 During cooling operation, the refrigerant is discharged from the compressor 26 and returns to the compressor 26 after passing through the four-way valve 32, the heat exchanger 22 of the outdoor unit 14, the expansion valve 30, and the heat exchanger 18 of the indoor unit 12 in that order. During heating operation, the refrigerant is discharged from the compressor 26 and returns to the compressor 26 after passing through the four-way valve 32, the heat exchanger 18 of the indoor unit 12, the expansion valve 30, and the heat exchanger 22 of the outdoor unit 14 in that order. The flow of the refrigerant during cooling operation and the flow of the refrigerant during heating operation are switched by the four-way valve 32. 【0024】 Figure 2 is a perspective view of the fan. Figure 3 is a front view of the fan. Furthermore, Figures 4 and 5 are side views of the fan from different directions, respectively. Finally, Figure 6 is a schematic diagram showing the multiple airfoil sections of the fins and the airflow. Note that the XYZ Cartesian coordinate system shown in the drawings is for the purpose of facilitating understanding of the embodiment and does not limit the embodiment. The Z-axis direction indicates the direction of extension of the fan's rotation centerline. 【0025】 As shown in Figures 2 to 5, the fan 24 has a hub 40 with a rotational centerline CL extending in the front-rear direction (Z-axis direction), two main blades 42 provided on the hub 40, and two ailerons 44 provided on the hub 40. The ailerons 44 are positioned between the two main blades 42 in the rotational direction RD. That is, the main blades 42 and ailerons 44 are arranged alternately in the rotational direction RD. 【0026】 The hub 40 of the fan 24 is generally frustoconical in shape and includes a front end 40a, a rear end 40b, and an outer circumferential surface 40c connecting the front end 40a and the rear end 40b. When the fan 24 rotates in the rotational direction RD around the rotational centerline CL, it draws in air from the front end 40a side of the hub 40 and blows out air from the rear end 40b side of the hub 40. Note that the hub 40 is not limited to a frustoconical shape, but may be cylindrical, for example. 【0027】 Each of the two main wings 42 of the fan 24 has the same shape and is mounted on the outer surface 40c of the hub 40 in a 180-degree rotationally symmetrical manner with respect to the rotation centerline CL. The main wing 42 has a leading edge 42a (first leading edge), a trailing edge 42b (first trailing edge), an outer edge side 42c (first outer edge side), a ventral surface 42d, and an inverted surface 42e. Furthermore, the main wing 42 has a radial length R1, a rotational length C1, and a longitudinal length H1. 【0028】 In this specification, the "radial length" of the main wing and aileron refers to the length in the direction perpendicular to the rotation centerline CL, and is the distance from the hub to the outer edge when viewed in the longitudinal direction (Z-axis direction). 【0029】 Furthermore, the "rotational length" of the main wing and aileron as used herein refers to the length of the rotational RD at the outer edge, centered on the rotational centerline CL. 【0030】 Furthermore, the "longitudinal length" of the main wing and aileron as used herein refers to the length in the direction in which the rotation centerline CL extends (Z-axis direction). In this embodiment, the "longitudinal length" is the length of the straight line drawn in the direction in which the rotation centerline CL extends, connecting the portion of the main wing 42 (aileron 44) located at the foremost end 40a of the hub 40 and the portion located at the rearmost end 40b, in a side view of the fan 24 (viewed in the X-axis direction and Y-axis direction). 【0031】 Specifically, the main wing 42 of the fan 24 is tilted forward in the rotational direction RD. That is, it is mounted on the hub 40 in a tilted state such that the leading edge 42a is on the front end 40a side of the hub 40 and the trailing edge 42b is on the rear end 40b side of the hub 40. 【0032】 Furthermore, the leading edge 42a of the main wing 42 extends forward from the hub 40 toward the outer peripheral edge 42c (forward in the direction of extension of the rotation centerline CL (Z-axis direction)) and in a spiral curve in the rotational direction RD. 【0033】 Furthermore, as shown in Figure 6, the main wing 42 has an airfoil cross-section in which the underside 42d is concave and the back surface 42e is convex. 【0034】 Furthermore, the main wing 42 has a shape in which, when viewed in the longitudinal direction (Z-axis direction), the length of the rotational direction RD increases from the hub 40 toward the outer edge 42c. 【0035】 Each of the two ailerons 44 of the fan 24 has the same shape and is provided on the outer circumferential surface 40c of the hub 40 in a 180-degree rotationally symmetrical manner with respect to the rotational centerline CL. The aileron 44 has a leading edge 44a (second leading edge), a trailing edge 44b, an outer circumferential side edge 44c (second outer circumferential side edge), a ventral surface 44d, and a back surface 44e. Furthermore, the aileron 44 has a radial length R2, a rotational length C2, and a longitudinal length H2. 【0036】 Specifically, the auxiliary blades 44 of the fan 24 are tilted forward in the rotational direction RD. That is, they are mounted on the hub 40 in a tilted state such that the leading edge 44a is on the front end 40a side of the hub 40 and the trailing edge 44b is on the rear end 40b side of the hub 40. 【0037】 Furthermore, the leading edge 44a of the aileron 44 extends forward from the hub 40 toward the outer peripheral end 44c (forward in the direction of extension of the rotation centerline CL (Z-axis direction)) and in a spiral curve in the rotational direction RD. 【0038】 Furthermore, as shown in Figure 6, the aileron 44 has an airfoil cross-section in which the ventral surface 44d is concave and the ventral surface 44e is convex. 【0039】 Furthermore, the auxiliary wing 44 has a shape in which the length of the rotational direction RD increases as it moves from the hub 40 toward the outer peripheral end 44c when viewed in the longitudinal direction (Z-axis direction). 【0040】 Therefore, the aileron 44 has a shape very similar to the main wing 42. Now, let's explain the major differences between the main wing 42 and the aileron 44. 【0041】 First, as shown in Figure 3, the radial length R1 of the main wing 42 is greater than the radial length R2 of the aileron 44. Also, at the outer peripheral ends 42c and 44c, the rotational length C1 of the main wing 42 is greater than the rotational length C2 of the aileron 44. Furthermore, as shown in Figures 4 and 5, in this embodiment, the longitudinal length H1 of the main wing 42 and the longitudinal length H2 of the aileron 44 are substantially the same. 【0042】 Furthermore, as shown in Figures 4 and 5, the rotational gradient θcs (second rotational gradient) of the aileron 44 is greater than the rotational gradient θcm (first rotational gradient) of the main wing 42. The rotational gradients θcm and θcs are defined by equations 1 and 2. 【0043】 【number】 【0044】 【number】 【0045】 Furthermore, the radial gradient θrs (second radial gradient) of the aileron 44 is greater than the radial gradient θrm (first radial gradient) of the main wing 42. The radial gradients θrm and θrs are defined by equations 3 and 4. 【0046】 【number】 【0047】 【number】 【0048】 With a fan 24 of this shape, as shown in Figure 6, when the fan 24 rotates around the rotation center line CL, an airflow F1 is generated along the ventral surface 42d of the main wing 42 and an airflow F2 is generated along the ventral surface 44d of the aileron 44. 【0049】 Furthermore, the difference in shape between the main wing 42 and the aileron 44 increases the airflow. The inventor has demonstrated this through simulations. 【0050】 Figures 7A and 7B are contour plots and vector diagrams showing the velocity distribution behind the main wing of the fan in the embodiment. Figures 8A and 8B are contour plots and vector diagrams showing the velocity distribution behind the main wing of the fan in Comparative Example 1. Figures 9A and 9B are contour plots and vector diagrams showing the velocity distribution behind the main wing of the fan in Comparative Example 2. In the contour plots, bright areas indicate high-velocity regions, and dark areas indicate low-velocity regions. In the vector diagrams, the direction of the arrows indicates the direction of airflow, and the length of the arrows indicates the magnitude of the velocity. 【0051】 The fan in the embodiment shown in Figures 7A and 7B is the fan 24 of the embodiment described above. The fan in Comparative Example 1 shown in Figures 8A and 8B corresponds to the fan 24 of the embodiment described above with the two ailerons 44 removed. Furthermore, the fan in Comparative Example 2 shown in Figures 9A and 9B corresponds to the fan in Comparative Example 24 of the embodiment described above with the shape of the ailerons 44 changed to the shape of a 1 / 2 size main wing 42, that is, the main wing 42 and ailerons 44 have similar shapes to each other. 【0052】 When the fans of Example, Comparative Example 1, and Comparative Example 2 were rotated at the same rotational speed (310 rpm), the velocity distributions shown in Figures 7A to 9B were obtained. Furthermore, the fan airflow of Comparative Example 1 (14.17 m³) 3 When compared to the reference value (per minute), the fan airflow of Comparative Example 2 increased by approximately 1.0% compared to Comparative Example 1, and the fan airflow of the Example increased by approximately 4.1% compared to Comparative Example 1. 【0053】 The inventor considered the following regarding this increase in airflow: 【0054】 First, as shown in Figures 7A and 9A, in the case of Example and Comparative Example 2, behind each main wing there is a high-speed region A1 generated by the airflow F1 flowing along the main wing and a high-speed region A2 generated by the airflow F2 flowing along the aileron. In contrast, in Comparative Example 1, there is no aileron, so there is no high-speed region A2 behind the main wing that originates from the aileron. 【0055】 The high-speed region A2 generated by the ailerons preceding the main wing is located behind the main wing, increasing the flow rate of the airflow F1 flowing along the main wing. In other words, the airflow F1 flowing along the main wing increases due to being drawn into the high-speed region A2 generated behind the main wing by the ailerons. As a result, the fan airflow increases. 【0056】 Furthermore, as shown in the embodiment in Figure 7A and Comparative Example 1 in Figure 9A, the high-speed region A2 generated by the airflow F2 flowing along the aileron is wider and faster (brighter) in the embodiment. 【0057】 In the embodiment, as shown in Figures 4 and 5, the rotational gradient θcs of the aileron 44 is greater than the rotational gradient θcm of the main wing 42. Also, the radial gradient θrs of the aileron 44 is greater than the radial gradient θrm of the main wing 42. In contrast, in Comparative Example 2, the rotational gradients of the main wing and aileron are the same, and the radial gradients of the main wing and aileron are also the same (because the main wing and aileron have similar shapes). 【0058】 These differences in aileron shape result in differences in the aileron-induced high-speed region behind the main wing. 【0059】 Therefore, in the fan 24 according to this embodiment, the main blade 42 and the aileron blade 44 are configured such that the rotational gradient θcs of the aileron blade 44 is larger than the rotational gradient θcm of the main blade 42, and the radial gradient θrs of the aileron blade 44 is larger than the radial gradient θrm of the main blade 42. As a result, the fan 24 achieves a large airflow performance. 【0060】 Furthermore, the ratio of the rotational gradient θcs of the aileron 44 to the rotational gradient θcm of the main wing 42 (θcs / θcm) is preferably in the range of approximately 1.5 to 2. 【0061】 Figure 10 shows the relationship between the ratio of the rotational gradient of the aileron to the rotational gradient of the main wing and the fan airflow ratio. 【0062】 As shown in Figure 10, the inventors obtained through simulation the change in the fan airflow ratio when the ratio of the rotational direction gradient of the aileron to the rotational direction gradient of the main wing is changed. The fan airflow ratio is shown as a ratio to the fan airflow of Comparative Example 1 described above. The rotational direction gradient ratio and the fan airflow ratio are also shown as percentages. In other words, a fan airflow ratio of 100% is substantially the same as the fan airflow of Comparative Example 1, which does not have ailerons. 【0063】 When the ratio of the rotational gradient θcs of the aileron 44 to the rotational gradient θcm of the main wing 42 (θcs / θcm) is smaller than approximately 1.5 (150%), the fan airflow ratio falls below that of Comparative Example 1. In this case, the opening of the aileron 44 becomes too small (hidden by the influence of the main wing), and almost no airflow improvement effect is obtained, which is undesirable. 【0064】 When the ratio of the rotational gradient θcs of the aileron 44 to the rotational gradient θcm of the main wing 42 (θcs / θcm) exceeds approximately 2.0 (200%), the fan airflow ratio decreases significantly. This is thought to be because the high-speed region A2 generated by the airflow F2 flowing along the aileron 44, as shown in Figure 7A, is too far from the main wing 42 to adequately induce the airflow F1 flowing along the main wing 42. Therefore, a rotational gradient ratio (θcs / θcm) exceeding approximately 2.0 is undesirable. Furthermore, when the rotational gradient ratio (θcs / θcm) exceeds approximately 2.0, the aileron 44 becomes a large rotational resistance to the fan 24, increasing the load torque acting on the motor that rotates the fan 24. Therefore, even considering the motor load torque, a rotational gradient ratio (θcs / θcm) exceeding approximately 2.0 is undesirable. 【0065】 As shown in Figure 3, in a longitudinal view (Z-axis direction), it is preferable that the distance RD in the rotational direction between the trailing edge 42b of the main wing 42 and the leading edge 44a of the aileron 44 at the same radial position is smaller than the distance RD in the rotational direction between the trailing edge 44b of the aileron 44 and the leading edge 42a of the main wing 42. In other words, in a longitudinal view (Z-axis direction), it is preferable that the angle θ1 between the trailing edge 42b of the main wing 42 and the leading edge 44a of the aileron 44 is smaller than the angle θ2 between the trailing edge 44b of the aileron 44 and the leading edge 42a of the main wing 42. 【0066】 Figure 11 shows the relationship between the angle between the trailing edge of the main wing and the leading edge of the aileron and the fan airflow ratio. 【0067】 As shown in Figure 11, the inventors obtained through simulation the change in the fan airflow ratio when the angle between the trailing edge of the main wing and the leading edge of the aileron was changed. The fan airflow ratio represents the ratio to the fan airflow of Comparative Example 1 described above. The fan airflow ratio is also expressed as a percentage. That is, a fan airflow ratio of 100% indicates that it is substantially the same as the fan airflow of Comparative Example 1, which does not have an aileron. 【0068】 As shown in Figure 11, the peak of the fan airflow ratio exists in the range where the angle θ1 between the trailing edge 42b of the main wing 42 and the leading edge 44a of the aileron 44 is smaller than the angle θ2 between the trailing edge 44b of the aileron 44 and the leading edge 42a of the main wing 42. Furthermore, when the angle θ1 becomes less than approximately 3 degrees, the fan airflow ratio decreases significantly. Therefore, it is preferable that the angle θ1 is greater than the angle θ2, and moreover, it is preferable that the angle θ1 is approximately 3 degrees or more. 【0069】 Furthermore, by making the angle θ1 between the trailing edge 42b of the main wing 42 and the leading edge 44a of the aileron 44 smaller than the angle θ2 between the trailing edge 44b of the aileron 44 and the leading edge 42a of the main wing 42, a noise reduction effect is also obtained. As shown in Figure 6, when angle θ1 is made smaller than angle θ2, the aileron 44 approaches the back surface 42e of the main wing 42. The airflow F2 flowing along the underside 44d of the aileron 44 rectifies the turbulence that is generated by the separation of the back surface 42e of the main wing 42 near the trailing edge 42b and causes noise. As a result, the noise generated from the fan 24 is reduced. 【0070】 Furthermore, considering factors other than fan airflow and noise, such as the torque load of the motor that rotates the fan 24, it is preferable that the longitudinal length of the main blade 42 is greater than the longitudinal length of the auxiliary blade 44 at the same radial position. As a result, in the rotational direction RD view, the entire auxiliary blade 44 is hidden by the main blade 42, the auxiliary blade 44 does not substantially contribute to rotational resistance, and the load torque is reduced (compared to the case where a part of the auxiliary blade 44 is exposed from the main blade 42 in the rotational direction RD view). 【0071】 According to this embodiment, the airflow performance of a fan equipped with multiple main wings and multiple ailerons can be further improved. 【0072】 Although the present disclosure has been described above with reference to the embodiments described above, the present disclosure is not limited to the embodiments described above. 【0073】 For example, in the embodiment described above, as shown in Figure 3, the fan 24 comprises two main blades 42 and two ailerons 44. However, the embodiments of this disclosure are not limited to this. The fan according to the embodiments of this disclosure only needs to have two or more identical numbers of main blades and ailerons. 【0074】 Furthermore, in the above-described embodiment, in the fan 24, the rotational gradient θcs of the aileron 44 is larger than the rotational gradient θcm of the main blade 42, and the radial gradient θrs of the aileron 44 is larger than the radial gradient θrm of the main blade 42. However, the embodiments of this disclosure are not limited to this. For example, if the rotational gradient ratio (θcs / θcm) shown in Figure 10 is approximately 1.9 (190%) (when the fan airflow ratio is at its peak), the radial gradient θrs of the aileron 44 may be slightly smaller than the radial gradient θrm of the main blade 42. Even in this case, the fan airflow is higher than in the case where the main blade and aileron have similar shapes (Comparative Example 2). 【0075】 Furthermore, because the radial gradient θrs of the aileron 44 is larger than the radial gradient θrm of the main wing 42, the following effects are obtained, unlike when the radial gradient θrs of the aileron 44 is smaller than the radial gradient θrm of the main wing 42. 【0076】 First, near the hub, if the rotational speed is the same, when the radial gradient θrs of the aileron 44 is larger than the radial gradient θrm of the main wing 42, the airflow is greater compared to when the radial gradient θrs of the aileron 44 is smaller than the radial gradient θrm of the main wing 42. From another perspective, if the airflow is the same, when the radial gradient θrs of the aileron 44 is larger than the radial gradient θrm of the main wing 42, the fan rotational speed can be reduced to lower the noise level, and the fan can also be made lighter. This is because, if the radial length of the aileron 44 is the same, when the radial gradient θrs of the aileron 44 is larger than the radial gradient θrm of the main wing 42, the projected area in the direction of rotation of the aileron 44 is larger, and it can come into contact with more air. Furthermore, because the ailerons 44, which have a shorter radial length than the main wings 42, come into contact with more air, the fan 24, which has two main wings 42 and two ailerons 44, can achieve roughly the same airflow performance as a fan with four main wings without ailerons, and the motor load torque is reduced compared to a fan with four main wings without ailerons. 【0077】 In other words, the fan according to the embodiment of the present disclosure, in a broad sense, comprises a hub having a rotational centerline extending in the longitudinal direction, a plurality of main wings that are inclined forward in the rotational direction and have a first outer peripheral end, a first trailing edge, and a first leading edge that extends forward from the hub toward the first outer peripheral end and in a spiral curve in the rotational direction, and a second leading edge that is inclined forward in the rotational direction and has a second outer peripheral end, a second trailing edge, and a second leading edge that extends forward from the hub toward the second outer peripheral end and in a spiral curve in the rotational direction, A fan having the same number of ailerons as the main wing, wherein the radial length of the ailerons is smaller than the radial length of the main wing, the rotational length of the second outer edge of the ailerons is smaller than the rotational length of the second outer edge of the main wing, and the second rotational gradient, which is the ratio of the longitudinal length to the rotational length of the second outer edge of the ailerons, is larger than the first rotational gradient, which is the ratio of the longitudinal length to the rotational length of the first outer edge of the main wing. [Industrial applicability] 【0078】 This disclosure is applicable to a fan having multiple main wings and multiple ailerons. [Explanation of Symbols] 【0079】 24 Fans 40 Hub 42 Main wing 42a First leading edge 42b First trailing edge 42c First outer edge 44 Ailerons 44a Second leading edge 44b Second trailing edge 44c Second outer edge

Claims

[Claim 1] A hub having a rotational centerline extending in the front-to-back direction, Multiple main wings, each having a first outer peripheral edge, a first trailing edge, and a first leading edge that extends forward from the hub toward the first outer peripheral edge and in a spiral curve in the direction of rotation, It has the same number of ailerons as the main wing, which are inclined forward in the rotational direction and have a second outer peripheral edge, a second trailing edge, and a second leading edge that extends forward from the hub toward the second outer peripheral edge and in a spiral curve in the rotational direction, and which do not overlap the main wing when viewed in the front-rear direction, The radial length of the aileron is smaller than the radial length of the main wing. The rotational length of the second outer peripheral end of the aileron is smaller than the rotational length of the second outer peripheral end of the main wing. The second rotational gradient, which is the ratio of the longitudinal length to the rotational length of the second outer edge of the aileron, is greater than the first rotational gradient, which is the ratio of the longitudinal length to the rotational length of the first outer edge of the main wing. The ratio of the second rotational gradient to the first rotational gradient is in the range of 1.5 to 2. A fan in which the second radial gradient, which is the ratio of the longitudinal length to the radial length of the aileron, is greater than the first radial gradient, which is the ratio of the longitudinal length to the radial length of the main wing. [Claim 2] The fan according to claim 1, wherein, in the forward and backward view, the distance in the rotational direction between the first trailing edge of the main wing and the second leading edge of the aileron is smaller than the distance in the rotational direction between the second trailing edge of the aileron and the first leading edge of the main wing. [Claim 3] The fan according to claim 2, wherein, in the forward and backward view, the angle between the first trailing edge of the main wing and the second leading edge of the aileron is 3 degrees or more. [Claim 4] The fan according to claim 1, wherein, at the same radial position, the longitudinal length of the main wing is greater than the longitudinal length of the aileron. [Claim 5] A fan according to any one of claims 1 to 4 above, An air conditioner including a heat exchanger positioned opposite the aforementioned fan.

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