WO2021111582A1 - 軸流ファン、送風装置、及び、冷凍サイクル装置 - Google Patents

軸流ファン、送風装置、及び、冷凍サイクル装置 Download PDF

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Publication number
WO2021111582A1
WO2021111582A1 PCT/JP2019/047624 JP2019047624W WO2021111582A1 WO 2021111582 A1 WO2021111582 A1 WO 2021111582A1 JP 2019047624 W JP2019047624 W JP 2019047624W WO 2021111582 A1 WO2021111582 A1 WO 2021111582A1
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WO
WIPO (PCT)
Prior art keywords
axial
vertical cross
edge portion
section
outer peripheral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/047624
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English (en)
French (fr)
Japanese (ja)
Inventor
敬英 田所
翔太 森川
奨太 細見
勝幸 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2021562281A priority Critical patent/JP7275312B2/ja
Priority to PCT/JP2019/047624 priority patent/WO2021111582A1/ja
Publication of WO2021111582A1 publication Critical patent/WO2021111582A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades

Definitions

  • the present invention relates to an axial fan provided with a blade, a blower equipped with the axial fan, and a refrigeration cycle device provided with the blower, and particularly to the shape of the blade.
  • a conventional axial fan is provided with a plurality of blades along the peripheral surface of a cylindrical boss, and the blades rotate according to the rotational force applied to the boss to transport a fluid.
  • the fluid existing between the blades collides with the blade surface.
  • the pressure on the surface where the fluid collides rises, and the fluid is pushed out and moved in the direction of the rotation axis, which is the central axis when the blade rotates.
  • a hub for connecting to a rotary drive device and a blade provided around the hub and having an upward warp portion that warps from the pressure surface side to the negative pressure surface side near the outer peripheral edge are provided.
  • An axial fan is proposed in which the radial width of the upper warp is set to narrow from the front edge side to the trailing edge side of the wing in the range on the trailing edge side of the wing covered with bell mouth. (See, for example, Patent Document 1).
  • Patent Document 1 on the front edge side where the airflow flows in from the periphery of the wing, for example, in what direction the airflow flowing in from the radial direction flows, which direction the airflow flowing in from the radial direction flows. There is no mention of how to handle it.
  • the airflow flowing in the axial direction is driven to the inner peripheral side by the airflow flowing inward in the radial direction.
  • the axial fan is on the outer peripheral side where the torque for pushing out the airflow is high, and when the amount of airflow to be blown is large, the efficiency of the blades at the time of blowing can be improved.
  • the axial fan changes the direction of the airflow flowing in from the radial direction in the axial direction on the front edge side where the airflow flows in from the periphery of the blade.
  • the present invention is for solving the above-mentioned problems, and is an axial flow fan that changes the direction of the airflow flowing in from the radial direction in the axial direction on the front edge side where the airflow flows in from the periphery of the blade. It is an object of the present invention to provide a blower equipped with an axial fan and a refrigeration cycle device equipped with the blower.
  • the axial flow fan according to the present invention includes a hub that is rotationally driven to form a rotating shaft, and a blade that is formed around the hub and has a front edge portion and a trailing edge portion, and the blade is in the axial direction of the rotating shaft.
  • the edge warp portion is provided at the outer peripheral end of the wing, and the edge warp portion is formed so that the normal of the pressure surface faces outward in the radial direction.
  • it is formed at least in the region between the front edge portion and the central portion which is an intermediate position between the front edge portion and the trailing edge portion, and is formed on the pressure surface in the vertical cross section on the front edge portion side.
  • the length along the trailing edge is formed to be larger than the length along the pressure plane in the vertical cross section on the trailing edge side.
  • the blower according to the present invention includes an axial fan having the above configuration, a drive source for applying a driving force to the axial fan, a bell mouth covering the outer peripheral edge of the wing near the trailing edge, an axial fan, and a drive. It is provided with a casing for accommodating the source.
  • the refrigeration cycle device includes a blower having the above configuration and a refrigerant circuit having a condenser and an evaporator, and the blower blows air to at least one of the condenser and the evaporator. ..
  • the axial flow fan has an edge warp portion at an end portion on the outer peripheral side of the blade in a vertical cross section along the axial direction and the radial direction of the rotating shaft.
  • the edge warp portion is formed so that the normal direction of the pressure surface is outward in the radial direction, and is formed at least in the circumferential direction between the front edge portion and the front edge portion and the trailing edge portion. It is formed in the area between the central part and the position. Further, the edge warp portion is formed so that the length along the pressure plane in the vertical cross section on the front edge portion side is larger than the length along the pressure plane in the vertical cross section on the trailing edge portion side.
  • the axial flow fan can apply a force to push out radially outward from the pressure surface to the airflow flowing inward in the radial direction from the outer peripheral side, and from the radial inward direction to the axial direction.
  • the direction of the airflow can be changed.
  • FIG. FIG. 5 is a top view of the axial fan according to the first embodiment as viewed in parallel with the rotation axis. It is sectional drawing in the axial direction and the radial direction of the axial flow fan at the position A in the circumferential direction shown in FIG. It is sectional drawing in the axial direction and the radial direction of the axial flow fan at the position AO in the circumferential direction shown in FIG. It is sectional drawing in the axial direction and the radial direction of the axial flow fan shown in FIG. It is sectional drawing in the axial direction and the radial direction of the axial flow fan shown in FIG. It is sectional drawing in the axial direction and the radial direction of the axial flow fan shown in FIG.
  • FIG. It is a perspective view of the axial flow fan shown in FIG. It is a rotation projection drawing of an axial fan seen from the viewpoint VP of FIG. 7. It is a perspective view of the axial flow fan which concerns on a comparative example. It is a rotation projection drawing of an axial fan seen from the viewpoint VP of FIG. It is sectional drawing in the axial direction and the radial direction at the position A and the position C shown in FIG. 2 of the axial flow fan which concerns on Embodiment 2. FIG. It is sectional drawing in the axial direction and the radial direction at the position A, the position B and the position C shown in FIG. 2 of the axial flow fan which concerns on Embodiment 2. FIG.
  • FIG. 1 It is sectional drawing in the axial direction and the radial direction at the position A and the position C shown in FIG. 2 of the axial flow fan which concerns on Embodiment 3.
  • FIG. 2 It is sectional drawing in the axial direction and the radial direction at the position A, the position B and the position C shown in FIG. 2 of the axial flow fan which concerns on Embodiment 3.
  • FIG. It is sectional drawing in the axial direction and the radial direction of the axial flow fan which concerns on Embodiment 4.
  • FIG. It is sectional drawing in the axial direction and the radial direction of the axial flow fan which concerns on Embodiment 4 shown in FIG. It is a rotation projection drawing of the axial flow fan which concerns on Embodiment 4.
  • FIG. 4 It is a rotation projection drawing of the axial flow fan which concerns on Embodiment 4.
  • FIG. 1 is a perspective view showing a schematic configuration of an axial fan 100 according to the first embodiment.
  • the rotation direction DR indicated by the arrow in the figure indicates the rotation direction DR of the axial fan 100.
  • the circumferential direction CD indicates the circumferential direction of the axial fan 100.
  • the direction F indicated by the white arrow in the figure indicates the direction F in which the air flow flows.
  • the Z1 side with respect to the axial fan 100 is the upstream side of the airflow with respect to the axial fan 100
  • the Z2 side with respect to the axial fan 100 is the airflow with respect to the axial fan 100. It is on the downstream side of.
  • the Z1 side is the air suction side with respect to the axial fan 100
  • the Z2 side is the air blow side with respect to the axial fan 100
  • the Y-axis represents the radial direction of the axial flow fan 100 with respect to the rotation axis RA.
  • Y1 is located on the outer peripheral side with respect to Y2, and Y2 is located on the inner peripheral side with respect to Y1. That is, the Y2 side of the axial fan 100 is the inner peripheral side of the axial fan 100, and the Y1 side of the axial fan 100 is the outer peripheral side of the axial fan 100.
  • the axial fan 100 is used, for example, in an air conditioner, a ventilation device, or the like.
  • the axial flow fan 100 includes a hub 10 connected to a rotating shaft of a drive source such as a motor (not shown), and a plurality of blades 20 formed around the hub 10. Be prepared.
  • the axial fan 100 includes a so-called bossless type fan in which the front edge side and the trailing edge side of adjacent blades 20 of a plurality of blades 20 are connected so as to form a continuous surface without a boss.
  • the hub 10 is rotationally driven by a drive source such as a connected motor (not shown) to form a rotary shaft RA.
  • the hub 10 rotates about the rotation axis RA.
  • the rotational direction DR of the axial fan 100 is the clockwise direction indicated by the arrow in FIG.
  • the rotation direction DR of the axial fan 100 is not limited to clockwise, and may be counterclockwise by changing the mounting angle of the blade 20 or the direction of the blade 20. ..
  • the hub 10 may be connected to the rotation shaft of the drive source as described above, and its shape is not limited.
  • the hub 10 may be formed in a cylindrical shape or may be formed in a plate shape.
  • the plurality of blades 20 are configured to extend radially outward from the hub 10.
  • the plurality of wings 20 are provided apart from each other in the circumferential direction CD.
  • the embodiment in which the number of blades 20 is three is illustrated, but the number of blades 20 is not limited to this.
  • the wing 20 has a front edge portion 21, a trailing edge portion 22, an outer peripheral edge portion 23, and an inner peripheral edge portion 24.
  • the front edge portion 21 is located on the upstream side (Z1 side) of the generated airflow, and is formed on the forward side of the rotation direction DR in the blade 20. That is, the front edge portion 21 is located forward with respect to the trailing edge portion 22 in the rotation direction DR.
  • the trailing edge portion 22 is located on the downstream side (Z2 side) of the generated airflow, and is formed on the wing 20 on the reverse side of the rotation direction DR. That is, the trailing edge portion 22 is located rearward with respect to the front edge portion 21 in the rotation direction DR.
  • the axial fan 100 has a front edge portion 21 as a blade end portion facing the rotational direction DR of the axial flow fan 100, and a trailing edge portion 22 as a blade end portion opposite to the front edge portion 21 in the rotational direction DR. have.
  • the outer peripheral edge portion 23 is a portion extending back and forth and in an arc shape so as to connect the outermost peripheral portion of the front edge portion 21 and the outermost peripheral portion of the trailing edge portion 22.
  • the outer peripheral edge portion 23 is located at the end portion in the radial direction (Y-axis direction) of the axial flow fan 100, and forms the outer peripheral edge portion of the blade 20.
  • the inner peripheral edge portion 24 is a portion extending back and forth and in an arc shape between the innermost peripheral portion of the front edge portion 21 and the innermost peripheral portion of the trailing edge portion 22.
  • the inner peripheral edge portion 24 serves as the base of the wing 20.
  • the inner peripheral edge 24 of the wing 20 is connected to the outer periphery of the hub 10.
  • the wing 20 is formed so as to be inclined at a predetermined angle with respect to the rotation axis RA so that the pressure surface 25 faces the rotation direction DR and the negative pressure surface 26 faces the direction opposite to the rotation direction DR.
  • the blade 20 conveys the fluid by pushing the gas existing between the blades 20 with the blade surface as the axial fan 100 rotates.
  • the surface of the blade surface where the pressure rises by pushing the gas is referred to as the pressure surface 25, and the surface on the back surface of the pressure surface 25 where the pressure decreases is designated as the negative pressure surface 26.
  • the surface on the upstream side (Z1 side) of the blade 20 is the negative pressure surface 26 and the surface on the downstream side (Z2 side) is the pressure surface 25 with respect to the direction F in which the air flow flows.
  • FIG. 2 is a top view of the axial fan 100 according to the first embodiment as viewed in parallel with the rotating shaft RA.
  • FIG. 3 is a cross-sectional view of the axial flow fan 100 in the axial direction and the radial direction at the position A of the circumferential CD shown in FIG.
  • FIG. 4 is a cross-sectional view of the axial flow fan 100 in the axial direction and the radial direction at the position AO of the circumferential CD shown in FIG.
  • FIG. 2 in order to explain the shape of the wing 20, only one wing 20 is described, and the illustration of the other wing 20 is omitted. Further, the cross-sectional views of the axial fan 100 after FIG. 3 conceptually show the curved shape of the blade 20.
  • the blade thickness between the pressure surface 25 and the negative pressure surface 26 is not specified and is simply shown, and the cross section of the blade 20 is shown linearly. ..
  • the axial fan 100 does not limit the thickness of the blade 20.
  • the blade 20 has an edge warped portion 30 at an end portion on the outer peripheral side of the blade 20 in a vertical cross section along the axial direction and the radial direction of the rotating shaft RA.
  • the edge warp portion 30 is formed so that the outer peripheral edge portion 23 warps toward the upstream side of the axial flow fan 100 in the flow direction F of the air flow formed by the axial flow fan 100.
  • the edge warp portion 30 is formed so that the pressure surface 25 of the blade 20 faces in a direction away from the rotation axis RA. That is, the edge warp portion 30 is a region in which the normal direction HN of the pressure surface 25 of the blade 20 is outward in the radial direction.
  • the edge warp portion 30 is formed at least in the region between the front edge portion 21 and the central portion 27 in the circumferential direction CD.
  • the central portion 27 is an intermediate position between the front edge portion 21 and the trailing edge portion 22 in the circumferential direction CD.
  • the edge warp portion 30 is formed in all regions between the front edge portion 21 and the central portion 27 in the circumferential direction CD.
  • the edge warp portion 30 is not limited to the configuration formed in all the regions between the front edge portion 21 and the central portion 27 in the circumferential direction CD.
  • the edge warp portion 30 may be formed in a part of the region between the front edge portion 21 and the central portion 27 in the circumferential direction CD.
  • edge warp portion 30 is formed in the front edge portion 21, but if it is formed in the region between the front edge portion 21 and the central portion 27, the edge warp portion 30 is formed in the front edge portion 21.
  • the edge warp portion 30 may be formed at least in the region between the front edge portion 21 and the central portion 27 in the circumferential direction CD, and is further continuously formed in the region between the central portion 27 and the trailing edge portion 22. It may be formed in.
  • the edge warp portion 30 is formed in a curved shape in a vertical cross section along the axial direction and the radial direction of the rotation axis RA. That is, in the edge warped portion 30, the pressure surface 25 of the blade 20 is formed in a curved surface shape. However, the edge warp portion 30 may be formed so that the normal direction HN of the pressure surface 25 of the blade 20 is outward in the radial direction, and is formed in a vertical cross section along the axial direction and the radial direction of the rotation axis RA. , It is not limited to the configuration formed in a curved shape. For example, the edge warp portion 30 may be formed linearly in a vertical cross section along the axial direction and the radial direction of the rotation axis RA.
  • the edge warp portion 30 is formed between the outer peripheral edge portion 23 and the apex portion 35 located on the inner peripheral side of the outer peripheral edge portion 23. That is, the edge warped portion 30 has an outer peripheral edge portion 23 at one end in the radial direction and an apex 35 at the other end.
  • the relationship between the apex 35 and the outer peripheral edge 23 on the same cross section of the blade 20 is such that the apex 35 is located downstream of the outer peripheral edge 23 in the flow direction F of the airflow formed by the axial fan 100. Is formed in.
  • the relationship between the apex 35 and the outer peripheral edge 23 on the same cross section of the blade 20 is that the outer peripheral edge 23 is located upstream of the apex 35 in the flow direction F of the airflow formed by the axial fan 100. It is formed to do.
  • the ratio of "the region from the inner peripheral edge portion 24 to the apex portion 35" to "the region from the apex portion 35 to the outer peripheral edge portion 23" is, for example, “8: 2" to "9.5: 0.5".
  • the ratio is an example, and the ratio of "the region from the inner peripheral edge portion 24 to the apex portion 35" to "the region from the apex portion 35 to the outer peripheral edge portion 23" is "8: 2" to "9.5: 0.5". Is not limited to.
  • the apex portion 35 is a portion forming the apex that first appears in the direction from the outer peripheral edge portion 23 toward the inner peripheral side.
  • the apex 35 forms a apex that is convex on the downstream side in the flow direction F of the air flow formed by the axial fan 100. That is, the apex 35 forms the apex of the wing 20 that is convex toward the pressure surface 25.
  • the edge warp portion 30 is a portion formed so as to warp from the pressure surface 25 side to the negative pressure surface 26 side with the apex portion 35 as a boundary.
  • the wing 20 forms a ridge line portion 36 which is a series of apex portions 35 on the pressure surface 25.
  • the ridge line portion 36 is formed from the front edge portion 21 toward the trailing edge portion 22 side and the outer peripheral edge portion 23 side.
  • the wing 20 may have a convex portion 33 at an end portion on the outer peripheral side of the wing 20 in a vertical cross section along the axial direction and the radial direction of the rotating shaft RA.
  • the convex portion 33 is curved so as to be convex toward the downstream side of the air flow in the flow direction F of the air flow formed by the axial fan 100.
  • the apex of the convex portion 33 is the apex portion 35 in the vertical cross section along the axial direction and the radial direction of the rotation axis RA.
  • the wing 20 has an edge warped portion 30 between the apex portion 35 of the convex portion 33 and the outer peripheral edge portion 23.
  • the blade 20 may have an edge warp portion 30 at an end opposite to the rotation axis RA in a vertical cross section of the blade 20 in the radial direction, and has a shape between the apex portion 35 and the inner peripheral edge portion 24.
  • the wing 20 may be formed in a substantially S-shape from the inner peripheral edge portion 24 to the apex portion 35 as shown in FIG. 3 in a vertical cross section along the axial direction and the radial direction of the rotation axis RA. It may be formed linearly from the inner peripheral edge portion 24 to the apex portion 35.
  • the wing 20 may have one or a plurality of curved portions from the inner peripheral edge portion 24 to the apex portion 35 in a vertical cross section along the axial direction and the radial direction of the rotation axis RA, and the inner peripheral edge portion may be provided. It may have one or more linear portions from 24 to the apex 35.
  • FIG. 5 is a cross-sectional view of the axial flow fan 100 shown in FIG. 2 in the axial direction and the radial direction.
  • the cross-sectional views of the position A, the position B, and the position C shown in FIG. 5 show the position A, the position B, and the position B between the front edge portion 21 and the trailing edge portion 22 of the blade 20 in the circumferential direction CD shown in FIG. It shows the cross-sectional shape of the axial fan 100 in the radial direction at three positions C. It is assumed that the position A, the position B and the position C are located in the order of the position A, the position B and the position C from the front edge portion 21 toward the trailing edge portion 22.
  • the position B is located on the trailing edge 22 side of the position A, and the position C is located on the trailing edge 22 side of the position B. Further, the position B is located on the front edge portion 21 side of the position C, and the position A is located on the front edge portion 21 side of the position B.
  • the edge warp portion 30 provided on the blade 20 of the axial fan 100 according to the first embodiment will be described with reference to FIGS. 2 and 5.
  • the length of the edge warp portion 30 along the pressure surface 25 is defined as the distance L. That is, the distance L is a distance along the pressure surface 25 from the outer peripheral edge portion 23 to the apex portion 35 in the vertical cross section along the axial direction and the radial direction of the rotation axis RA.
  • the distance L is a general term for the distance LA, the distance LB, the distance LC, and the like at each position of the circumferential CD, which will be described later.
  • the length of the edge warp portion 30A along the pressure surface 25 is defined as the distance LA. That is, the distance LA is the distance along the pressure surface 25 from the outer peripheral edge portion 23 to the apex portion 35A in the vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position A.
  • the length of the edge warp portion 30B along the pressure surface 25 is defined as the distance LB. That is, the distance LB is the distance along the pressure surface 25 from the outer peripheral edge portion 23 to the apex portion 35B in the vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position B.
  • the length of the edge warp portion 30C along the pressure surface 25 is defined as the distance LC. That is, the distance LC is the distance along the pressure surface 25 from the outer peripheral edge portion 23 to the apex portion 35C in the vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position C.
  • edge warp portion 30A, the edge warp portion 30B, and the edge warp portion 30C are collectively referred to as the above-mentioned edge warp portion 30, and the apex portion 35A, the apex portion 35B, and the apex portion 35C are collectively referred to as the above-mentioned apex portion 35.
  • the distance LA is formed larger than the distance LB
  • the distance LB is formed larger than the distance LC (distance LA> distance LB> distance LC).
  • the length of the edge warp portion 30 along the pressure surface 25 in the vertical cross section on the front edge portion 21 side is rearranged so that the distance LA> the distance LB, the distance LB> the distance LC, and the distance LA> the distance LC. It is formed so as to be larger than the length along the pressure surface 25 in the vertical cross section on the edge portion 22 side. Further, the length of the edge warped portion 30 along the pressure surface 25 gradually increases from the trailing edge portion 22 side to the front edge portion 21 side so that the distance LA> the distance LB> the distance LC. Is formed in.
  • the distance D is a radial distance perpendicular to the rotation axis RA from the outer peripheral edge portion 23 to the apex portion 35 in a vertical cross section along the axial direction and the radial direction of the rotation axis RA, and is the outer peripheral edge portion 23 in a plan view. It is a radial distance from to the apex 35.
  • the distance D is a general term for the distance DA, the distance DB, the distance DC, and the like at each position of the circumferential CD, which will be described later.
  • the length of the edge warp portion 30A in the radial direction perpendicular to the rotation axis RA is defined as the distance DA. That is, the distance DA is a radial distance perpendicular to the rotation axis RA from the outer peripheral edge portion 23 to the apex portion 35A in a vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position A, and is a plan view. It is a radial distance from the outer peripheral edge portion 23 to the apex portion 35A in the above.
  • the distance DB is a radial distance perpendicular to the rotation axis RA from the outer peripheral edge portion 23 to the apex portion 35B in a vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position B, and is a plane. It is a radial distance from the outer peripheral edge portion 23 to the apex portion 35B in the visual direction.
  • the length of the edge warp portion 30C in the radial direction perpendicular to the rotation axis RA is defined as the distance DC. That is, the distance DC is a radial distance perpendicular to the rotation axis RA from the outer peripheral edge portion 23 to the apex portion 35C in a vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position C, and is a plane. It is a radial distance from the outer peripheral edge portion 23 to the apex portion 35C in the visual direction.
  • the distance DA is formed larger than the distance DB
  • the distance DB is formed larger than the distance DC (distance DA> distance DB> distance DC).
  • the edge warp portion 30 is formed so that distance DA> distance DB, distance DB> distance DC, and distance DA> distance DC. Therefore, in the edge warped portion 30, the length in the radial direction perpendicular to the rotation axis RA in the vertical cross section on the front edge portion 21 side is larger than the length in the radial direction perpendicular to the rotation axis RA in the vertical cross section on the trailing edge portion 22 side. Is also formed to be large.
  • the radial distance D between the outer peripheral edge portion 23 and the apex portion 35 in the vertical cross section on the front edge portion 21 side is the same as the outer peripheral edge portion 23 in the vertical cross section on the trailing edge portion 22 side. It is formed so as to be larger than the radial distance D from the apex portion 35.
  • the edge warped portion 30 is gradually lengthened in the radial direction perpendicular to the rotation axis RA from the trailing edge portion 22 side to the front edge portion 21 side so that the distance DA> the distance DB> the distance DC. It is formed to be large. That is, the edge warp portion 30 is formed so that the radial distance D between the outer peripheral edge portion 23 and the apex portion 35 gradually increases from the trailing edge portion 22 side to the front edge portion 21 side. There is.
  • FIG. 6 is a cross-sectional view of the axial flow fan 100 shown in FIG. 5 in the axial direction and the radial direction.
  • the dotted line VA shown in FIG. 6 is a line parallel to the rotation axis RA passing through the apex portion 35A.
  • the distance WA shown by the broken line is the distance between the dotted line VA and the rotation axis RA.
  • the dotted line VB is a line parallel to the rotation axis RA passing through the apex 35B.
  • the distance WB shown by the broken line is the distance between the dotted line VB and the rotation axis RA.
  • the dotted line VC is a line parallel to the rotation axis RA passing through the apex portion 35C.
  • the distance WC shown by the broken line is the distance between the dotted line VC and the rotation axis RA.
  • the blade 20 of the axial fan 100 has a distance WA formed smaller than the distance WB and a distance WB formed smaller than the distance WC (distance WA ⁇ distance WB ⁇ distance WC). Therefore, the apex portion 35 is formed so that the front edge portion 21 side is located on the inner peripheral side in the radial direction rather than the trailing edge portion 22 side. In this case, the blade 20 has the same distance between the rotating shaft RA and the outer peripheral edge portion 23 at any position of the circumferential CD, and the blade outer diameter of the axial fan 100 is constant.
  • the apex portion 35 is not limited to the one formed so that the front edge portion 21 side is located on the inner peripheral side in the radial direction rather than the trailing edge portion 22 side.
  • the normal direction HA of the pressure surface 25 of the edge warp portion 30A is indicated by a white arrow.
  • the normal direction HB of the pressure surface 25 of the edge warp portion 30B is indicated by a white arrow.
  • the normal direction HC of the pressure surface 25 of the edge warp portion 30C is indicated by a white arrow.
  • the normal direction of the pressure surface 25 of the edge warp portion 30 is outward in the radial direction as shown in the normal direction HA, the normal direction HB, and the normal direction HC.
  • the above-mentioned normal direction HN is a general term for the normal direction HA, the normal direction HB, and the normal direction HC, and represents the normal direction of the pressure surface 25.
  • the apex 35 is arranged so that the front edge 21 side is located on the inner peripheral side in the radial direction rather than the trailing edge 22 side.
  • the region where the normal direction of the pressure surface 25 is outward in the radial direction can be made wider on the front edge portion 21 side than on the trailing edge portion 22 side. That is, when the outer diameter of the blade of the axial fan 100 is constant, the apex portion 35 is arranged so that the front edge portion 21 side is located on the inner peripheral side in the radial direction rather than the trailing edge portion 22 side.
  • the wing 20 can have the edge warped portion 30 wider on the front edge portion 21 side than on the trailing edge portion 22 side.
  • FIG. 7 is a perspective view of the axial fan 100 shown in FIG.
  • FIG. 8 is a rotation projection drawing of the axial fan 100 as seen from the viewpoint VP of FIG. 7.
  • FIG. 8 shows an example of the axial fan 100 when the axial fan 100 according to the first embodiment is rotationally projected onto the meridional plane.
  • the blade 20 when rotationally projected onto the meridional plane is indicated by the blade projection portion 20t
  • the hub 10 when rotationally projected onto the meridional plane is indicated by the hub projection portion 10t.
  • FIG. 8 shows an example of the axial fan 100 when the axial fan 100 according to the first embodiment is rotationally projected onto the meridional plane.
  • the blade 20 when rotationally projected onto the meridional plane is indicated by the blade projection portion 20t
  • the hub 10 when rotationally projected onto the meridional plane is indicated by the hub projection portion 10t.
  • FIG. 8 shows a case where the axial fan 100 is used together with the bell mouth 63.
  • the airflow SF shown in FIG. 8 is an airflow that flows into the axial flow fan 100 from the axial direction of the rotating shaft RA, and the airflow OF is an airflow that flows into the axial flow fan 100 from the radial direction. The effect of the axial fan 100 will be described with reference to FIGS. 7 and 8.
  • the axial flow fan 100 has an edge warped portion 30 at an end portion on the outer peripheral side of the blade 20 in a vertical cross section along the axial direction and the radial direction of the rotating shaft RA.
  • the edge warped portion 30 is formed so that the normal direction HN of the pressure surface 25 is outward in the radial direction, and in the circumferential direction CD, at least the front edge portion 21, the front edge portion 21, and the trailing edge are formed. It is formed in a region between the central portion 27 and the central portion 27 which is an intermediate position between the portions 22 and the central portion 27.
  • the edge warped portion 30 is formed so that the length along the pressure surface 25 in the vertical cross section on the front edge portion 21 side is larger than the length along the pressure surface 25 in the vertical cross section on the trailing edge portion 22 side.
  • the axial flow fan 100 can apply a force EF that pushes out from the pressure surface 25 in the radial direction to the airflow OF that flows inward in the radial direction from the outer peripheral side, and from the inward direction in the radial direction.
  • the direction of the airflow OF can be changed in the axial direction.
  • the axial fan 100 suppresses the occurrence of a state in which the airflow SF flowing in on the inner peripheral side is further driven to the inner peripheral side by the airflow OF flowing in from the outer peripheral side. As a result, the axial fan 100 blows more airflow on the outer peripheral side where the torque for pushing out the airflow is high, and the efficiency of the blade 20 at the time of blowing air improves. Further, in the axial fan 100, the vortex generated near the outer peripheral end of the blade 20 is eliminated, and the energy loss is reduced.
  • the axial fan 100 improves the efficiency of the fan by improving the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side having a high torque for pushing out the airflow and reducing the energy loss by suppressing the generation of vortices. Can be made to.
  • FIG. 9 is a perspective view of an axial fan 100L according to a comparative example.
  • FIG. 10 is a rotation projection drawing of the axial fan 100L as seen from the viewpoint VP of FIG.
  • FIG. 10 shows an example of the axial fan 100L when the axial fan 100L according to the comparative example is rotationally projected onto the meridional plane.
  • the edge warp portion 30 is a central portion that is at least an intermediate position between the front edge portion 21 and the front edge portion 21 and the trailing edge portion 22 in the circumferential direction CD. It is formed in the region between 27.
  • the warped portion 30L that warps from the pressure surface 25 side to the negative pressure surface 26 side is located between the front edge portion 21 and the trailing edge portion 22 in the circumferential direction CD. It is formed in the area. That is, the axial flow fan 100 according to the first embodiment and the axial flow fan 100L according to the comparative example have different forming ranges of the edge warp portion 30 and the warp portion 30L in the circumferential direction CD.
  • the edge warped portion 30 has a length along the pressure surface 25 in the vertical cross section on the front edge portion 21 side, which is the pressure surface in the vertical cross section on the trailing edge portion 22 side. It is formed so as to be larger than the length along 25.
  • the length of the warped portion 30L along the pressure surface 25 in the vertical cross section on the trailing edge portion 22 side is the pressure surface 25 in the vertical cross section on the front edge portion 21 side. It is formed so as to be larger than the length along the.
  • the axial fan 100 according to the first embodiment has a wider range of the edge warp portion 30 on the front edge portion 21 side with respect to the trailing edge portion 22 side, whereas the axial flow fan 100L according to the comparative example has a front edge portion 21 side.
  • the range of the warped portion 30L on the trailing edge portion 22 side is wider than that on the edge portion 21 side.
  • the size of the warped portion 30L on the front edge portion 21 side is smaller than the size of the warped portion 30L on the trailing edge portion 22 side. Therefore, in the axial fan 100L according to the comparative example, the airflow OF flowing inward in the radial direction flows into the front edge portion 21, and the airflow SF flowing in the axial direction is driven to the inner peripheral side. As a result, in the axial fan 100L according to the comparative example, the airflow to be blown on the outer peripheral side where the torque for pushing out the airflow is high is reduced, and the efficiency of the blades at the time of blowing may be lowered.
  • the airflow near the outer peripheral end of the blade 20 becomes low, and the turbulent VT is caused by the speed difference between the airflow near the outer peripheral end of the blade 20 and the airflow on the inner peripheral side of the blade 20. It may occur and cause energy loss.
  • the axial flow fan 100 since the axial flow fan 100 according to the first embodiment has the above configuration, the force EF that pushes the airflow OF that flows inward in the radial direction from the outer peripheral side from the pressure surface 25 outward in the radial direction is applied. In addition, the airflow OF turns from radial inward to axial. Therefore, the axial fan 100 suppresses the occurrence of a state in which the airflow SF flowing in on the inner peripheral side is further driven to the inner peripheral side by the airflow OF flowing in from the outer peripheral side.
  • the axial fan 100 improves the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side where the torque for pushing out the airflow is high, and reduces the energy loss by suppressing the generation of vortices. , The efficiency of the fan can be improved.
  • the axial fan 100 has an edge warped portion 30 having a large area on the front edge portion 21 side with respect to the trailing edge portion 22 side. Therefore, the axial fan 100 has many surfaces that push air outward in the radial direction on the front edge portion 21 side where the air flow in the radial direction easily flows.
  • the airflow is corrected in the axial direction of the rotating shaft RA from the front edge portion 21 side to the trailing edge portion 22 side by the edge warp portion 30 on the front edge portion 21 side.
  • a surface that pushes air outward in the radial direction becomes unnecessary, and the area of the edge warped portion 30 becomes smaller.
  • the edge warp portion 30 forming a surface that pushes air outward in the radial direction is formed so as to become smaller from the upstream side to the downstream side in the flow direction F of the air flow formed by the axial fan 100.
  • edge warp portion 30 is formed so that the length along the pressure surface 25 increases from the trailing edge portion 22 side to the front edge portion 21 side. Since the axial flow fan 100 has this configuration, the flow is changed so as to gradually push the airflow OF flowing in from the side surface side in the axial direction, so that sudden changes in the direction of the airflow that causes turbulence VT are reduced. Therefore, the axial fan 100 can reduce the energy loss.
  • the edge warped portion 30 is formed so that the radial length in the vertical cross section on the front edge portion 21 side is larger than the radial length in the vertical cross section on the trailing edge portion 22 side.
  • an axial fan there is an airflow flowing in from the radial direction on the front edge side where the airflow flows in from the periphery of the blade.
  • the axial fan 100 can form the area of the edge warped portion 30 on the front edge portion 21 side larger than the area of the edge warped portion 30 on the trailing edge portion 22 side.
  • the axial flow fan 100 can apply a force EF that pushes outward from the pressure surface 25 to the airflow OF that flows inward in the radial direction from the outer peripheral side at the front edge portion 21, and is inward in the radial direction.
  • the direction of the airflow can be changed from the direction to the axial direction. Therefore, as described above, the axial fan 100 improves the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side where the torque for pushing out the airflow is high, and reduces the energy loss by suppressing the generation of vortices. The efficiency of the fan can be improved.
  • edge warp portion 30 is formed so that the length in the radial direction increases from the trailing edge portion 22 side to the front edge portion 21 side. Since the axial flow fan 100 has this configuration, the flow is changed so as to gradually push the airflow OF flowing in from the side surface side in the axial direction, so that sudden changes in the direction of the airflow that causes turbulence VT are reduced. Therefore, the axial fan 100 can reduce the energy loss.
  • the edge warped portion 30 has an outer peripheral edge portion 23 forming the outer peripheral edge of the wing 20 and an apex portion 35 forming the apex that first appears in the direction from the outer peripheral edge portion 23 toward the inner peripheral side in the vertical cross section. It is formed between.
  • the axial flow fan 100 can form the edge warp portion 30 as an inclined surface in the radial direction.
  • the axial flow fan 100 can apply a force EF that pushes out from the pressure surface 25 in the radial direction to the airflow OF that flows inward in the radial direction from the outer peripheral side at the edge warp portion 30, and from the inward direction in the radial direction.
  • the direction of the airflow can be changed in the axial direction.
  • the axial fan 100 improves the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side where the torque for pushing out the airflow is high, and reduces the energy loss by suppressing the generation of vortices.
  • the efficiency of the fan can be improved.
  • the radial distance D between the outer peripheral edge portion 23 and the apex portion 35 in the vertical cross section on the front edge portion 21 side is the same as the outer peripheral edge portion 23 in the vertical cross section on the trailing edge portion 22 side. It is formed so as to be larger than the radial distance D from the apex portion 35.
  • the axial fan 100 can form the area of the edge warped portion 30 on the front edge portion 21 side larger than the area of the edge warped portion 30 on the trailing edge portion 22 side.
  • the axial flow fan 100 can apply a force EF that pushes outward from the pressure surface 25 to the airflow OF that flows inward in the radial direction from the outer peripheral side at the front edge portion 21, and is inward in the radial direction.
  • the direction of the airflow can be changed from the direction to the axial direction. Therefore, as described above, the axial fan 100 improves the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side where the torque for pushing out the airflow is high, and reduces the energy loss by suppressing the generation of vortices. The efficiency of the fan can be improved.
  • edge warp portion 30 is formed so that the radial distance D between the outer peripheral edge portion 23 and the apex portion 35 increases from the trailing edge portion 22 side to the front edge portion 21 side. Since the axial flow fan 100 has this configuration, the flow is changed so as to gradually push the airflow OF flowing in from the side surface side in the axial direction, so that sudden changes in the direction of the airflow that causes turbulence VT are reduced. Therefore, the axial fan 100 can reduce the energy loss.
  • the apex portion 35 is radially closer to the front edge portion 21 side than to the trailing edge portion 22 side. It is formed so as to be located on the inner peripheral side of.
  • the axial fan 100 can form the area of the edge warped portion 30 on the front edge portion 21 side larger than the area of the edge warped portion 30 on the trailing edge portion 22 side. That is, in the axial fan 100, the region where the normal direction HN of the pressure surface 25 is radially outward is wider in the front edge portion 21 than in the trailing edge portion 22 side.
  • the axial flow fan 100 can apply a force EF that pushes outward from the pressure surface 25 to the airflow OF that flows inward in the radial direction from the outer peripheral side at the front edge portion 21, and is inward in the radial direction.
  • the direction of the airflow can be changed from the direction to the axial direction. Therefore, as described above, the axial fan 100 improves the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side where the torque for pushing out the airflow is high, and reduces the energy loss by suppressing the generation of vortices. The efficiency of the fan can be improved.
  • the axial fan 100 since the distance between the inner peripheral edge portion 24 and the apex portion 35 on the trailing edge portion 22 side of the blade 20 is wider than that on the front edge portion 21 side, the area for catching air is widened and the fan Efficiency can be improved.
  • FIG. 11 is a cross-sectional view of the axial flow fan 100 according to the second embodiment in the axial and radial directions at positions A and C shown in FIG.
  • FIG. 12 is a cross-sectional view of the axial flow fan 100 according to the second embodiment in the axial and radial directions at positions A, B, and C shown in FIG.
  • the axial fan 100 according to the second embodiment will be described with reference to FIGS. 11 and 12.
  • the axial fan 100 according to the second embodiment specifies the length of the edge warp portion 30 in the axial direction of the rotary shaft RA.
  • the parts having the same configuration as the axial fan 100 of FIGS. 1 to 10 are designated by the same reference numerals, and the description thereof will be omitted.
  • the distance T is a distance in a direction parallel to the axial direction of the rotating shaft RA from the outer peripheral edge portion 23 to the apex portion 35 in the vertical cross section along the axial direction and the radial direction of the rotating shaft RA, and is radially outside. It is a distance from the outer peripheral edge portion 23 to the apex portion 35 in the side view seen from the side.
  • the distance T is a general term for the distance TA, the distance TB, the distance TC, and the like at each position of the circumferential CD, which will be described later.
  • the length of the edge warp portion 30A in the direction parallel to the axial direction of the rotating shaft RA is defined as the distance TA. .. That is, the distance TA is the distance in the direction parallel to the axial direction of the rotating shaft RA from the outer peripheral edge portion 23 to the apex portion 35A in the vertical cross section along the axial direction and the radial direction of the rotating shaft RA at the position A. It is the distance from the outer peripheral edge portion 23 to the apex portion 35A in the side view seen from the outside in the radial direction.
  • the length of the edge warp portion 30B in the direction parallel to the axis direction of the rotation axis RA is defined as the distance TB. That is, the distance TB is a distance in a direction parallel to the axial direction of the rotation axis RA from the outer peripheral edge portion 23 to the apex portion 35B in the vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position B. It is the distance from the outer peripheral edge portion 23 to the apex portion 35B in the side view seen from the outside in the radial direction.
  • the length of the edge warp portion 30C in the direction parallel to the axis direction of the rotation axis RA is defined as the distance TC. That is, the distance TC is a distance in a direction parallel to the axial direction of the rotation axis RA from the outer peripheral edge portion 23 to the apex portion 35C in the vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position C. It is the distance from the outer peripheral edge portion 23 to the apex portion 35C in the side view seen from the outside in the radial direction.
  • the distance TA is formed larger than the distance TB, and the distance TB is formed larger than the distance TC (distance TA> distance TB> distance TC).
  • the edge warp portion 30 is formed so that distance TA> distance TB, distance TB> distance TC, and distance TA> distance TC. Therefore, the length of the edge warped portion 30 in the direction parallel to the axial direction of the rotating shaft RA in the vertical cross section on the front edge portion 21 side is parallel to the axial direction of the rotating shaft RA in the vertical cross section on the trailing edge portion 22 side. It is formed so as to be larger than the length in the direction.
  • the distance T in the direction parallel to the axial direction of the rotation axis RA between the outer peripheral edge portion 23 and the apex portion 35 in the vertical cross section on the front edge portion 21 side is on the trailing edge portion 22 side. It is formed so as to be larger than the distance T in the direction parallel to the axial direction of the rotation axis RA between the outer peripheral edge portion 23 and the apex portion 35 in the vertical cross section.
  • the edge warp portion 30 has a length in a direction parallel to the axial direction of the rotation axis RA so as to be such that distance TA> distance TB> distance TC, as the length of the edge warp portion 30 goes from the trailing edge portion 22 side to the front edge portion 21 side. It is formed so as to gradually increase in size. That is, in the edge warped portion 30, the distance T in the direction parallel to the axial direction of the rotation axis RA between the outer peripheral edge portion 23 and the apex portion 35 gradually increases from the trailing edge portion 22 side to the front edge portion 21 side. It is formed to be large.
  • the normal direction HA of the pressure surface 25 of the edge warp portion 30A is closer to parallel to the radial direction than the normal direction HB of the pressure surface 25 of the edge warp portion 30B.
  • the normal direction HB of the pressure surface 25 of the edge warp portion 30B is closer to parallel to the radial direction than the normal direction HC of the pressure surface 25 of the edge warp portion 30C. That is, the normal direction of the pressure surface 25 of the edge warped portion 30 is closer to the front edge portion 21 side than the trailing edge portion 22 side in parallel with the radial direction.
  • the normal direction of the pressure surface 25 of the edge warped portion 30 gradually approaches parallel to the radial direction from the trailing edge portion 22 side to the front edge portion 21 side.
  • the normal direction HB of the pressure surface 25 of the edge warp portion 30B is closer to parallel to the axial direction of the rotation axis RA than the normal direction HA of the pressure surface 25 of the edge warp portion 30A.
  • the normal direction HC of the pressure surface 25 of the edge warp portion 30C is closer to parallel to the axial direction of the rotation axis RA than the normal direction HB of the pressure surface 25 of the edge warp portion 30B. That is, the normal direction of the pressure surface 25 of the edge warped portion 30 is closer to the trailing edge portion 22 side than the front edge portion 21 side in parallel with the axial direction of the rotation axis RA.
  • the normal direction of the pressure surface 25 of the edge warped portion 30 gradually approaches parallel to the axial direction of the rotation axis RA from the front edge portion 21 side to the trailing edge portion 22 side.
  • the length of the warped edge portion 30 in the direction parallel to the axial direction of the rotating shaft RA in the vertical cross section on the front edge portion 21 side is parallel to the axial direction of the rotating shaft RA in the vertical cross section on the trailing edge portion 22 side. It is formed to be larger than the length.
  • the axial fan 100 can form the area of the edge warped portion 30 on the front edge portion 21 side larger than the area of the edge warped portion 30 on the trailing edge portion 22 side. That is, in the axial fan 100, the region where the normal direction HN of the pressure surface 25 is radially outward is wider in the front edge portion 21 than in the trailing edge portion 22 side.
  • the axial flow fan 100 can apply a force EF that pushes outward from the pressure surface 25 to the airflow OF that flows inward in the radial direction from the outer peripheral side at the front edge portion 21, and is inward in the radial direction.
  • the direction of the airflow can be changed from the direction to the axial direction. Therefore, as described above, the axial fan 100 improves the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side where the torque for pushing out the airflow is high, and reduces the energy loss by suppressing the generation of vortices. The efficiency of the fan can be improved.
  • the distance T in the direction parallel to the axial direction of the rotation axis RA between the outer peripheral edge portion 23 and the apex portion 35 in the vertical cross section on the front edge portion 21 side is on the trailing edge portion 22 side. It is formed so as to be larger than the distance T in the direction parallel to the axial direction of the rotation axis RA between the outer peripheral edge portion 23 and the apex portion 35 in the vertical cross section.
  • the axial fan 100 can form the area of the edge warped portion 30 on the front edge portion 21 side larger than the area of the edge warped portion 30 on the trailing edge portion 22 side.
  • the region where the normal direction HN of the pressure surface 25 is radially outward is wider in the front edge portion 21 than in the trailing edge portion 22 side. Then, the axial flow fan 100 can apply a force EF that pushes outward from the pressure surface 25 to the airflow OF that flows inward in the radial direction from the outer peripheral side at the front edge portion 21, and is inward in the radial direction.
  • the direction of the airflow can be changed from the direction to the axial direction.
  • the axial fan 100 improves the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side where the torque for pushing out the airflow is high, and reduces the energy loss by suppressing the generation of vortices.
  • the efficiency of the fan can be improved.
  • the rotation axis RA gradually increases as the normal direction HN of the pressure surface 25 of the edge warp portion 30 moves from the front edge portion 21 side to the trailing edge portion 22 side. It is approaching parallel to the axial direction of. Then, on the front edge portion 21 side of the blade 20 which is the inlet of the air flow, the normal direction HN of the pressure surface 25 of the blade 20 faces the outermost radial direction. Therefore, the axial fan 100 is more likely to direct the airflow flowing from the outer peripheral side to the inner peripheral side in the axial direction by the force EF that pushes the airflow outward in the radial direction.
  • edge warp portion 30 is formed so that the length in the direction parallel to the axial direction of the rotation axis RA increases from the trailing edge portion 22 side to the front edge portion 21 side. Since the axial flow fan 100 has this configuration, the flow is changed so as to gradually push the airflow OF flowing in from the side surface side in the axial direction, so that sudden changes in the direction of the airflow that causes turbulence VT are reduced. Therefore, the axial fan 100 can reduce the energy loss.
  • the distance T in the direction parallel to the axial direction of the rotation axis RA between the outer peripheral edge portion 23 and the apex portion 35 increases from the trailing edge portion 22 side to the front edge portion 21 side. It is formed to be. Since the axial flow fan 100 has this configuration, the flow is changed so as to gradually push the airflow OF flowing in from the side surface side in the axial direction, so that sudden changes in the direction of the airflow that causes turbulence VT are reduced. Therefore, the axial fan 100 can reduce the energy loss.
  • FIG. 13 is a cross-sectional view of the axial flow fan 100 according to the third embodiment in the axial and radial directions at positions A and C shown in FIG.
  • FIG. 14 is an axial and radial cross-sectional view of the axial fan 100 according to the third embodiment at positions A, B and C shown in FIG.
  • the axial fan 100 according to the third embodiment will be described with reference to FIGS. 13 and 14.
  • the axial fan 100 according to the third embodiment specifies the curvature of the edge warp portion 30 in the axial direction of the rotating shaft RA.
  • the parts having the same configuration as the axial fan 100 of FIGS. 1 to 12 are designated by the same reference numerals, and the description thereof will be omitted.
  • the edge warp portion 30 is formed in a curved shape in a vertical cross section along the axial direction and the radial direction of the rotation axis RA.
  • the edge warp portion 30A is formed in an arc shape that is convex toward the downstream side in the flow direction F of the air flow formed by the axial flow fan 100. Therefore, the pressure surface 25 of the edge warp portion 30 is formed in a curved surface shape that is convex to the downstream side in the flow direction F of the air flow formed by the axial fan 100.
  • the curvature of the edge warp portion 30 is defined as the curvature C in the vertical cross section along the axial direction and the radial direction of the rotation axis RA.
  • Curvature C is a general term for curvature CA, curvature CB, curvature CC, etc. at each position of the circumferential CD, which will be described later.
  • the curvature of the edge warp portion 30A is defined as the curvature CA in the vertical cross section along the axial direction and the radial direction of the rotation axis RA at the position A.
  • the curvature of the edge warp portion 30B is defined as the curvature CB.
  • the curvature of the edge warp portion 30C is defined as the curvature CC.
  • the blade 20 of the axial fan 100 has a curvature CA formed larger than the curvature CB and a curvature CB formed larger than the curvature CC (curvature CA> curvature CB> curvature CC).
  • the edge warp portion 30 is formed so that the curvature CA> the curvature CB, the curvature CB> the curvature CC, and the curvature CA> the curvature CC. Therefore, the edge warp portion 30 is formed so that the curvature C in the vertical cross section on the front edge portion 21 side is larger than the curvature C in the vertical cross section on the trailing edge portion 22 side. Further, the edge warp portion 30 is formed so that the curvature gradually increases from the trailing edge portion 22 side to the front edge portion 21 side so that the curvature CA> the curvature CB> the curvature CC.
  • the normal direction HA of the pressure surface 25 of the edge warp portion 30A is closer to parallel to the radial direction than the normal direction HB of the pressure surface 25 of the edge warp portion 30B.
  • the normal direction HB of the pressure surface 25 of the edge warp portion 30B is closer to parallel to the radial direction than the normal direction HC of the pressure surface 25 of the edge warp portion 30C. That is, the normal direction of the pressure surface 25 of the edge warped portion 30 is closer to the front edge portion 21 side than the trailing edge portion 22 side in parallel with the radial direction.
  • the normal direction of the pressure surface 25 of the edge warped portion 30 gradually approaches parallel to the radial direction from the trailing edge portion 22 side to the front edge portion 21 side.
  • the edge warped portion 30 is formed so that the curvature C in the vertical cross section on the front edge portion 21 side is larger than the curvature C in the vertical cross section on the trailing edge portion 22 side.
  • the axial fan 100 is formed in an arc shape from the apex portion 35 to the outer peripheral edge portion 23, and the larger the curvature, the more the normal direction HN on the pressure surface 25 near the outer peripheral edge portion 23 becomes outward in the radial direction. In the axial fan 100, the region where the normal direction HN of the pressure surface 25 is radially outward is wider on the front edge portion 21 than on the trailing edge portion 22 side.
  • the axial flow fan 100 can apply a force EF that pushes outward from the pressure surface 25 to the airflow OF that flows inward in the radial direction from the outer peripheral side at the front edge portion 21, and is inward in the radial direction.
  • the direction of the airflow can be changed from the direction to the axial direction. Therefore, as described above, the axial fan 100 improves the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side where the torque for pushing out the airflow is high, and reduces the energy loss by suppressing the generation of vortices. The efficiency of the fan can be improved.
  • edge warp portion 30 is formed so that the curvature increases from the trailing edge portion 22 side toward the front edge portion 21 side. Since the axial flow fan 100 has this configuration, the flow is changed so as to gradually push the airflow OF flowing in from the side surface side in the axial direction, so that sudden changes in the direction of the airflow that causes turbulence VT are reduced. Therefore, the axial fan 100 can reduce the energy loss.
  • FIG. 15 is a cross-sectional view of the axial flow fan 100 according to the fourth embodiment in the axial direction and the radial direction.
  • FIG. 16 is a cross-sectional view of the axial fan 100 according to the fourth embodiment shown in FIG. 15 in the axial direction and the radial direction.
  • the axial fan 100 according to the fourth embodiment will be described with reference to FIGS. 15 and 16.
  • the axial fan 100 according to the fourth embodiment specifies the shape between the inner peripheral edge portion 24 and the apex portion 35 of the blade 20.
  • the parts having the same configuration as the axial fan 100 of FIGS. 1 to 14 are designated by the same reference numerals, and the description thereof will be omitted.
  • a straight line connecting the inner peripheral edge portion 24 and the apex portion 35, which are the roots of the blade 20 is defined as a straight line DL.
  • the straight line DL is inclined so that the apex portion 35, which is one end, is located downstream of the inner peripheral edge 24, which is the other end, in the flow direction F of the airflow formed by the axial fan 100. ..
  • the straight line DL connecting the inner peripheral edge portion 24 and the apex portion 35, which is the base of the blade 20, is on the downstream side in the flow direction F of the air flow formed by the axial fan 100 as it goes from the inner peripheral edge portion 24 to the apex portion 35. It is tilted toward.
  • the direction of the normal line HD of the straight line DL connecting the inner peripheral edge portion 24 and the apex portion 35, which is the base of the wing 20, is the inner side in the radial direction. It is formed so as to face.
  • the normal HD faces the side opposite to the direction toward the pressure surface 25. That is, in the vertical cross section along the axial direction and the radial direction of the rotation axis RA, the direction of the normal HD facing the side opposite to the direction toward the pressure surface 25 is directed toward the rotation axis RA. Is formed in.
  • the wing 20 has a vertical cross section along the axial direction and the radial direction of the rotation axis RA forming a straight line DL at at least one position of the circumferential direction CD.
  • the wing 20 has a portion in which the normal HI of the pressure surface 25 faces the inner circumference in the region on the inner peripheral side of the apex portion 35, as shown in FIG. ..
  • FIG. 17 is a rotation projection drawing of the axial fan 100 according to the fourth embodiment.
  • the blade 20 of the axial flow fan 100 according to the fourth embodiment is a normal HD of a straight line DL connecting the inner peripheral edge portion 24 and the apex portion 35, which are the roots of the blade 20 in the vertical cross section, and faces the pressure surface 25. It is formed so that the direction of the normal HD facing the opposite side of the direction faces the inside in the radial direction.
  • the blade 20 has a portion in which the normal HI of the pressure surface 25 faces the inner circumference in the region on the inner circumference side of the apex 35, and the airflow flowing in from the inner circumference side is directed to the outer circumference side in the radial direction. It can be blown without pushing it out.
  • the airflow OF flowing from the outer peripheral side to the inner peripheral side in the radial direction and the airflow IF flowing from the inner peripheral side are blown without interfering with each other. The loss can be reduced and the efficiency of the fan can be improved.
  • FIG. 18 is a rotation projection drawing of the axial fan 100R according to the comparative example.
  • the axial fan 100 according to the comparative example is the axial fan 100 according to the first to third embodiments.
  • the airflow flowing into the inner peripheral side of the blade tends to move toward the outer peripheral side in the radial direction due to centrifugal force.
  • the edge warped portion 30 of the axial flow fan 100 according to the first to third embodiments suppresses the airflow from the outer peripheral side in the radial direction to the inner peripheral side, the airflow IF flowing into the inner peripheral side is the outer peripheral side in the radial direction. It becomes easier to move to.
  • the airflow near the inner peripheral edge portion 24 of the blade 20 is reduced, and a vortex VU that causes turbulence of the airflow may be generated.
  • the blade 20 has a portion in which the normal HI of the pressure surface 25 faces the inner circumference in a region on the inner circumference side of the apex portion 35. , The airflow flowing in from the inner peripheral side can be blown without being pushed out to the outer peripheral side in the radial direction. Therefore, in the axial fan 100 according to the fourth embodiment, the airflow becomes slow on the inner peripheral side, and the generation of the vortex VU that causes turbulence can be suppressed.
  • the axial fan 100 can rectify the airflow flowing on the inner peripheral side of the blade 20 and the airflow flowing on the outer peripheral side of the blade 20 by the synergistic effect of the above configuration of the blade 20 and the edge warp portion 30. Further, the efficiency of the fan can be improved.
  • Embodiment 5 describes a case where the axial fan 100 and the like of the first to fourth embodiments are applied to the outdoor unit 50 of the refrigeration cycle device 70 as a blower.
  • FIG. 19 is a schematic view of the refrigeration cycle device 70 according to the fifth embodiment.
  • the refrigeration cycle device 70 will be described when it is used for air conditioning, but the refrigeration cycle device 70 is not limited to the one used for air conditioning.
  • the refrigeration cycle device 70 is used for refrigeration or air conditioning applications such as refrigerators or freezers, vending machines, air conditioners, refrigeration devices, and water heaters.
  • the refrigerating cycle device 70 includes a refrigerant circuit 71 in which a compressor 64, a condenser 72, an expansion valve 74, and an evaporator 73 are connected in order by a refrigerant pipe.
  • the condenser 72 is provided with a condenser fan 72a that blows heat exchange air to the condenser 72.
  • the evaporator 73 is provided with an evaporator fan 73a that blows heat exchange air to the evaporator 73.
  • At least one of the condenser fan 72a and the evaporator fan 73a is composed of the axial flow fan 100 according to any one of the above-described first to fourth embodiments.
  • the refrigerating cycle device 70 may be configured to provide a flow path switching device such as a four-way valve for switching the flow of the refrigerant in the refrigerant circuit 71 to switch between the heating operation and the cooling operation.
  • FIG. 20 is a perspective view of the outdoor unit 50, which is a blower, when viewed from the air outlet side.
  • FIG. 21 is a diagram for explaining the configuration of the outdoor unit 50 from the upper surface side.
  • FIG. 22 is a diagram showing a state in which the fan grill 54 is removed from the outdoor unit 50.
  • FIG. 23 is a diagram showing the internal configuration by removing the fan grill 54, the front panel 52, and the like from the outdoor unit 50.
  • the outdoor unit main body 51 which is a casing, is configured as a housing having a pair of left and right side surfaces 51a and 51c, a front surface 51b, a back surface 51d, an upper surface 51e, and a bottom surface 51f.
  • An opening for sucking air from the outside is formed on the side surface 51a and the back surface 51d.
  • the front panel 52 is formed with an outlet 53 as an opening for blowing air to the outside.
  • the air outlet 53 is covered with a fan grill 54, thereby preventing contact between an external object or the like of the outdoor unit main body 51 and the axial fan 100 to ensure safety.
  • the arrow AR in FIG. 21 indicates the air flow.
  • An axial fan 100 and a fan motor 61 are housed in the outdoor unit main body 51.
  • the axial flow fan 100 is connected to a fan motor 61, which is a drive source on the back surface 51d side, via a rotating shaft 62, and is rotationally driven by the fan motor 61.
  • the fan motor 61 applies a driving force to the axial fan 100.
  • the inside of the outdoor unit main body 51 is divided into a blower chamber 56 in which the axial fan 100 is installed and a machine room 57 in which the compressor 64 and the like are installed by a partition plate 51 g which is a wall body.
  • Heat exchangers 68 that extend in a substantially L-shape in a plan view are provided on the side surface 51a side and the back surface 51d side in the blower chamber 56.
  • the heat exchanger 68 functions as a condenser 72 during the cooling operation and as an evaporator 73 during the heating operation.
  • the heat exchanger 68 provided on the suction side of the axial flow fan 100 includes a plurality of fins arranged side by side so that the plate-shaped surfaces are parallel to each other, and a heat transfer tube penetrating each fin in the parallel arrangement direction. It has.
  • a refrigerant that circulates in the refrigerant circuit 71 circulates in the heat transfer tube.
  • the heat exchanger 68 of the present embodiment is configured such that a heat transfer tube extends in an L shape from the side surface 51a and the back surface 51d of the outdoor unit main body 51, and a plurality of stages of heat transfer tubes meander while penetrating the fins. ..
  • the heat exchanger 68 is connected to the compressor 64 via a pipe 65 or the like, and further connected to an indoor heat exchanger, an expansion valve or the like (not shown) to form a refrigerant circuit 71 of the air conditioner. .. Further, a board box 66 is arranged in the machine room 57, and the equipment mounted in the outdoor unit is controlled by the control board 67 provided in the board box 66.
  • a bell mouth 63 is arranged on the radial outer side of the axial flow fan 100 arranged in the blower chamber 56.
  • the bell mouth 63 is located outside the outer peripheral end of the blade 20 and forms an annular shape along the rotation direction of the axial fan 100.
  • the partition plate 51g is located on one side of the bell mouth 63, and a part of the heat exchanger 68 is located on the other side.
  • the front end of the bell mouth 63 is connected to the front panel 52 of the outdoor unit 50 so as to surround the outer circumference of the air outlet 53.
  • the bell mouth 63 may be integrally configured with the front panel 52, or may be separately prepared so as to be connected to the front panel 52.
  • the flow path between the suction side and the blow side of the bell mouth 63 is configured as an air passage near the air outlet 53. That is, the air passage in the vicinity of the air outlet 53 is separated from other spaces in the air blowing chamber 56 by the bell mouth 63.
  • FIG. 24 is a conceptual diagram showing the relationship between the axial fan 100 and the bell mouth 63.
  • the bell mouth 63 is formed in a tubular shape, and has an inlet portion 63a formed so that the flow path narrows from the upstream side to the downstream side in the flow direction F of the air flow formed by the blade 20, and a rotation shaft. It has a straight pipe portion 63b formed so as to extend in a direction parallel to the axial direction of RA.
  • the inlet portion 63a is formed so that the opening diameter gradually decreases from the upstream end to the downstream end in the direction of the air flow sucked into the outdoor unit main body 51.
  • the straight pipe portion 63b is formed in a cylindrical shape.
  • the inner diameter of the straight pipe portion 63b may change slightly in manufacturing, but the change in inner diameter due to manufacturing is not taken into consideration.
  • the range in which the straight pipe portion 63b and the blade 20 of the axial flow fan 100 overlap at the axial position of the rotary axis RA is referred to as a range RY.
  • the wrapping range RY is a range in which the bell mouth 63 covers the outer peripheral edge portion 23 of the wing 20 in the radial direction.
  • the wrapping range RY is a range in which the bell mouth 63 and the blade 20 of the axial fan 100 overlap at a position in the axial direction of the rotation axis RA.
  • the range in which the outer peripheral edge portion 23 of the blade 20 is not covered by the straight pipe portion 63b is referred to as a non-wrapping range RN.
  • the range in which the inlet portion 63a and the blade 20 of the axial fan 100 overlap at the axial position of the rotary shaft RA is defined as the unwrapped range RN.
  • the bell mouth 63 covers the outer peripheral edge projection portion 23t closer to the trailing edge portion 22, that is, the outer peripheral edge portion 22 of the wing 20. In other words, the bell mouth 63 does not cover the outer peripheral edge of the wing 20 near the front edge 21.
  • the axial fan 100 and the bell mouth 63 are arranged so that the edge warp portion 30 is located in the range RN where the blade 20 of the axial fan 100 and the bell mouth 63 do not wrap.
  • the edge warp portion 30 may be formed in a range RN in which the blade 20 of the axial fan 100 and the bell mouth 63 do not wrap.
  • the edge warp portion 30 is formed on the outer peripheral edge of the wing 20 in a range not covered by the bell mouth 63. Therefore, the edge warp portion 30 is not limited to the configuration formed at least in the region between the front edge portion 21 and the central portion 27 in the circumferential direction CD.
  • the length of the edge warped portion 30 along the pressure surface 25 is from the trailing edge portion 22 side to the front edge portion 21 in a range RN in which the blade 20 of the axial fan 100 and the bell mouth 63 do not wrap. It is set to increase toward the side. That is, in the outdoor unit 50, the length of the edge warped portion 30 along the pressure surface 25 increases from the trailing edge portion 22 side to the front edge portion 21 side in a range not covered by the bell mouth 63. It is set.
  • the radial length of the edge warp portion 30 is directed from the trailing edge portion 22 side to the front edge portion 21 side in a range RN in which the blade 20 of the axial fan 100 and the bell mouth 63 do not wrap. It is set to increase as it increases. That is, the outdoor unit 50 is set so that the radial length of the edge warp portion 30 increases from the trailing edge portion 22 side to the front edge portion 21 side in a range not covered by the bell mouth 63. There is.
  • the length of the edge warped portion 30 in the direction parallel to the axial direction of the rotating shaft RA is on the trailing edge portion 22 side in the range RN in which the blade 20 of the axial fan 100 and the bell mouth 63 do not wrap. It is set to increase from the front edge portion 21 side toward the front edge portion 21 side. That is, in the outdoor unit 50, the length of the edge warped portion 30 in the direction parallel to the axial direction of the rotating shaft RA goes from the trailing edge portion 22 side to the front edge portion 21 side within a range not covered by the bell mouth 63. It is set to increase as it increases.
  • the curvature of the edge warp portion increases from the trailing edge portion 22 side to the front edge portion 21 side in the range RN where the blade 20 of the axial fan 100 and the bell mouth 63 do not wrap. It is set. That is, the outdoor unit 50 is set so that the curvature of the edge warp portion increases from the trailing edge portion 22 side to the front edge portion 21 side in a range not covered by the bell mouth 63.
  • FIG. 25 is a conceptual diagram of a modified example of the bell mouth 63 shown in FIG. 24.
  • the bell mouth 63 shown in FIG. 25 has an entrance portion 63d in which the structure of the entrance portion 63a is further specified.
  • the inlet portion 63d of the bell mouth 63 forms an inclined surface approaching the rotation axis RA from the outer side in the radial direction to the inner side. ing.
  • the entrance portion 63d of the bell mouth 63 is formed in the shape of a truncated cone.
  • FIG. 26 is a conceptual diagram of another modification of the bell mouth 63 shown in FIG. 24.
  • the bell mouth 63 shown in FIG. 26 has an entrance portion 63e in which the structure of the entrance portion 63a is further specified.
  • the inlet portion 63e of the bell mouth 63 has a curved portion that is convex toward the rotating shaft RA side of the axial flow fan 100.
  • the inlet portion 63e of the bell mouth 63 has a range formed by a curved surface that is convex toward the rotation axis RA side of the axial flow fan 100.
  • the axial fan 100 is a fan by improving the efficiency of the blade 20 at the time of blowing by using the airflow on the outer peripheral side having a high torque for pushing out the airflow and reducing the energy loss by suppressing the generation of vortices. Efficiency can be improved. Therefore, if the axial fan 100 is mounted on the blower, the blower can increase the amount of blown air with high efficiency.
  • the axial flow fan 100 is mounted on the air conditioner or the outdoor unit for hot water supply, which is the refrigeration cycle device 70 composed of the compressor 64 and the heat exchanger 68, the amount of air passing through the heat exchanger 68 is highly efficient. Can be earned, and the amount of heat exchange in the heat exchanger 68 can be increased. Therefore, the refrigeration cycle device 70 can realize energy saving of the device. Further, if the axial flow fan 100 is mounted on the refrigeration cycle device 70, the refrigeration cycle device 70 can be changed to a heat exchanger 68 which is smaller than when the conventional axial flow fan is used, and the amount of refrigerant can be reduced. Can contribute.
  • blower and the refrigeration cycle device 70 are provided from the radial outer side to the inner side by the edge warp portion 30 in the range RN where the blade 20 and the bell mouth 63, in which the inflow airflow increases from the radial outer side to the inner side, do not wrap. It is possible to apply a radial outer force to the inflow airflow. Therefore, the blower and the refrigeration cycle device 70 can suppress the turbulence of the airflow due to the interference between the airflow flowing in from the inner peripheral side and the inflowing airflow from the outside to the inside in the radial direction.
  • the inlet portion 63d of the bell mouth 63 forms an inclined surface approaching the rotating shaft RA from the outer side in the radial direction to the inner side.
  • the inlet portion 63e of the bell mouth 63 has a curved portion that is convex toward the rotating shaft RA side of the axial flow fan 100.
  • the blower and the refrigeration cycle device 70 have such a configuration, the airflow from the outside in the radial direction can easily flow along the bell mouth 63, so that the airflow from the outside in the radial direction can be easily sucked into the axial fan 100. Become. Then, after the airflow flows between the rotating blades 20, the blower and the refrigerating cycle device 70 can rectify the airflow flowing in from the outer peripheral side where the suction airflow is large by the axial flow fan 100 in the axial direction. it can.
  • the blower and refrigeration cycle device 70 combine an axial fan 100, which is efficient with respect to the inflow of airflow from the outside in the radial direction, and a bell mouth 63, which promotes the inflow of airflow from the outside in the radial direction.
  • the air volume driven by the fan 100 can be increased.
  • the inlet portion 63a, the inlet portion 63d, or the inlet portion 63e of the bell mouth 63 faces the edge warp portion 30 in the radial direction. Since the blower and the refrigeration cycle device 70 have such a configuration, the airflow from the outside in the radial direction can easily flow along the bell mouth 63, so that the airflow from the outside in the radial direction can be easily sucked into the axial fan 100. Become. Then, after the airflow flows between the rotating blades 20, the blower and the refrigerating cycle device 70 can rectify the airflow flowing in from the outer peripheral side where the suction airflow is large by the axial flow fan 100 in the axial direction. it can.
  • the blower and refrigeration cycle device 70 combine an axial fan 100, which is efficient with respect to the inflow of airflow from the outside in the radial direction, and a bell mouth 63, which promotes the inflow of airflow from the outside in the radial direction.
  • the air volume driven by the fan 100 can be increased.
  • the configuration shown in the above embodiment is an example, and can be combined with another known technique, or a part of the configuration may be omitted or changed without departing from the gist. It is possible.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
PCT/JP2019/047624 2019-12-05 2019-12-05 軸流ファン、送風装置、及び、冷凍サイクル装置 Ceased WO2021111582A1 (ja)

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PCT/JP2019/047624 WO2021111582A1 (ja) 2019-12-05 2019-12-05 軸流ファン、送風装置、及び、冷凍サイクル装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024051594A (ja) * 2022-09-30 2024-04-11 山洋電気株式会社 軸流ファン

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Publication number Priority date Publication date Assignee Title
JPS5887999U (ja) * 1981-12-11 1983-06-15 株式会社日立製作所 プロペラフアン
JPH07301198A (ja) * 1994-05-09 1995-11-14 Matsushita Refrig Co Ltd 送風機
JP2003148395A (ja) * 2001-11-09 2003-05-21 Matsushita Electric Ind Co Ltd 空調用送風機羽根車
JP2012233420A (ja) * 2011-04-28 2012-11-29 Mitsubishi Electric Corp 送風機
JP2013213420A (ja) * 2012-04-02 2013-10-17 Panasonic Corp 送風機とそれを用いた室外ユニット
CN103486081A (zh) * 2012-06-11 2014-01-01 珠海格力电器股份有限公司 轴流风叶、风机及空调器室外机
JP2018150933A (ja) * 2017-03-10 2018-09-27 日本電産株式会社 軸流ファン

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5887999U (ja) * 1981-12-11 1983-06-15 株式会社日立製作所 プロペラフアン
JPH07301198A (ja) * 1994-05-09 1995-11-14 Matsushita Refrig Co Ltd 送風機
JP2003148395A (ja) * 2001-11-09 2003-05-21 Matsushita Electric Ind Co Ltd 空調用送風機羽根車
JP2012233420A (ja) * 2011-04-28 2012-11-29 Mitsubishi Electric Corp 送風機
JP2013213420A (ja) * 2012-04-02 2013-10-17 Panasonic Corp 送風機とそれを用いた室外ユニット
CN103486081A (zh) * 2012-06-11 2014-01-01 珠海格力电器股份有限公司 轴流风叶、风机及空调器室外机
JP2018150933A (ja) * 2017-03-10 2018-09-27 日本電産株式会社 軸流ファン

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2024051594A (ja) * 2022-09-30 2024-04-11 山洋電気株式会社 軸流ファン

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