WO2023276570A1 - 送風ファン - Google Patents

送風ファン Download PDF

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Publication number
WO2023276570A1
WO2023276570A1 PCT/JP2022/022790 JP2022022790W WO2023276570A1 WO 2023276570 A1 WO2023276570 A1 WO 2023276570A1 JP 2022022790 W JP2022022790 W JP 2022022790W WO 2023276570 A1 WO2023276570 A1 WO 2023276570A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
blades
blower fan
fan rotation
line
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/JP2022/022790
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
知美 馬場
卓也 宇佐見
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.)
Denso Corp
Original Assignee
Denso 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 Denso Corp filed Critical Denso Corp
Priority to CN202280043958.1A priority Critical patent/CN117545927A/zh
Publication of WO2023276570A1 publication Critical patent/WO2023276570A1/ja
Priority to US18/514,403 priority patent/US12297840B2/en
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
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • 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
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
    • 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
    • F04D29/384—Blades characterised by form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/31—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor with roughened surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2250/00—Geometry
    • F05D2250/10—Two-dimensional
    • F05D2250/18—Two-dimensional patterned
    • F05D2250/182—Two-dimensional patterned crenellated, notched

Definitions

  • the present disclosure relates to blower fans.
  • This blower fan includes a hub attached to a drive motor, a plurality of blades provided on the hub, and a ring portion provided to connect the tips of the plurality of blades.
  • a serration consisting of a plurality of triangular projections is provided on the leading edge of each blade from the center to the tip.
  • An object of the present disclosure is to provide a blower fan capable of more accurately suppressing noise while maintaining the air volume.
  • a blower fan is a blower fan that rotates about a predetermined fan rotation axis in a fan rotation direction, and includes a hub arranged on the fan rotation axis and a hub extending outward from the outer circumference of the hub.
  • a plurality of formed blades and an annular ring portion provided so as to connect respective tip portions of the plurality of blades are provided.
  • a divergence suppression structure is formed at the tip of the blade to suppress divergence of the air flow from the blade.
  • the blade has a shape that directs the flow direction of the air passing through the blade to the divergence suppression structure of the adjacent blade that is arranged behind the blade in the fan rotation direction.
  • the air that has passed through a given blade can easily flow toward the divergence suppression structure of the adjacent blade arranged behind that blade, so the effect of the divergence suppression structure can be enhanced. Therefore, it is possible to more accurately suppress noise while maintaining the air volume.
  • FIG. 1 is a front view showing the front structure of the blower fan of the first embodiment.
  • FIG. 2 is an enlarged view showing the enlarged structure of the blade of the first embodiment.
  • FIG. 3 is a graph showing the relationship between blade pitch and skew angle of the blade of the first embodiment.
  • FIG. 4 is a graph showing the relationship between the blade pitch and skew angle inclination of the blade of the first embodiment.
  • FIG. 5 is a cross-sectional view showing a cross-sectional structure along line VV of FIG.
  • FIG. 6 is a graph showing the relationship between the blade pitch and the blade chord length of the blade of the first embodiment.
  • FIG. 7 is an enlarged view showing the enlarged structure of the blade of the first embodiment.
  • FIG. 8 is a front view showing the front structure of the blower fan of the first embodiment.
  • FIG. 9 is a diagram schematically showing the flow of air in the blades of the first embodiment.
  • FIG. 10 is a diagram schematically showing the flow of air around the serrations of the first embodiment.
  • FIG. 11 is a front view showing the front structure of the blower fan of the second embodiment.
  • FIG. 12 is an enlarged view showing the enlarged structure of the blade of another embodiment.
  • FIG. 13 is an enlarged view showing the enlarged structure of the blade of another embodiment.
  • FIG. 14 is an enlarged view showing the enlarged structure of the blade of another embodiment.
  • FIG. 15 is an enlarged view showing the enlarged structure of the blade of another embodiment.
  • blower fan 10 of the first embodiment shown in FIG. 1 will be described.
  • the blower fan 10 rotates about the fan rotation axis m10 in the direction indicated by the arrow F, thereby forming an air flow in the direction along the fan rotation axis m10.
  • the blower fan 10 is made of resin or the like.
  • the blower fan 10 includes a hub 20 , blades 30 and a ring portion 40 .
  • the direction indicated by the arrow F will be referred to as the "fan rotation direction F”
  • the radial direction about the fan rotation axis m10 will be referred to as the "fan radial direction”.
  • the hub 20 is provided on the fan rotation axis m10, and is formed in a bottomed cylindrical shape around the fan rotation axis m10.
  • the blower fan 10 has a plurality of blades 30 , specifically seven blades 30 .
  • the blades 30 are formed to extend outward in the fan radial direction from the outer periphery of the hub 20 .
  • the blade 30 has a curved shape protruding in the fan rotation direction F.
  • the end of the blade 30 connected to the hub 20 is referred to as a base end 31 and the opposite end thereof is referred to as a tip end 32 .
  • Each blade 30 has the same shape and is arranged at equal angular intervals ⁇ in the fan rotation direction F. As shown in FIG. That is, each blade 30 is arranged at equal pitches.
  • the ring portion 40 is formed in an annular shape centering on the fan rotation axis m10 and is provided so as to connect the tip portions 32 of the blades 30 .
  • the hub 20 rotates in the fan rotation direction F about the fan rotation axis m10 by transmitting the power of the motor (not shown) to the hub 20.
  • the motor not shown
  • the shape of the blade 30 of this embodiment will be specifically described.
  • the blade 30 has a bent portion 36 at a portion closer to the proximal end 31 than the center between the proximal end 31 and the distal end 32 .
  • the bent portion 36 is formed to protrude in the fan rotation direction F.
  • the blade 30 is formed in an L shape as a whole.
  • a serration 34 is formed on the front edge portion 33 of the tip portion 32 of the blade 30 in the fan rotation direction F.
  • the serrations 34 consist of a plurality of triangular projections.
  • the serrations 34 function as a separation suppression structure that suppresses the separation of the airflow from the blades 30 .
  • the serrations 34 suppress the divergence of the airflow from the blades 30, thereby suppressing the generation of noise.
  • the center point at each position of the blade 30 in the fan radial direction can be defined as “C10”, “C11”, and “C12", for example.
  • C10 is the center point of the width of the base end portion 31 of the blade 30 in the fan circumferential direction.
  • C11 is the center point of the width in the fan circumferential direction at the tip portion 32 of the blade 30 where the serration 34 is not provided.
  • C12 is the center point of the width of the portion of the blade 30 located on the virtual circle VC11 with the radius R11 centered on the fan rotation axis m10.
  • the reference line m20 of the blade 30 is defined as indicated by a two-dot chain line in FIG. Define as That is, the reference line m20 is a line perpendicular to the fan rotation axis m10 and passing through the center point C10 of the base end portion 31 of the blade 30 .
  • the blade centerline m30 is a line connecting the center points C10 to C12 of the blade 30 from the base end 31 to the tip end 32 of the blade 30. As shown in FIG.
  • the angle formed by a line perpendicular to the fan rotation axis m10 and passing through a predetermined position on the blade centerline m30 of the blade 30, for example, the lines n11 and n12 shown in FIG. Define the skew angle ⁇ at a given position.
  • a line n11 is a line orthogonal to the fan rotation axis m10 and passing through the position C11.
  • the skew angle at the position C11 of the wing centerline m30 of the blade 30 can be defined by the angle ⁇ 11 formed by this line n11 with respect to the reference line m20.
  • a line n12 is perpendicular to the fan rotation axis m10 and passes through the position C12.
  • the skew angle at the position C12 on the wing centerline m30 of the blade 30 can be defined by the angle ⁇ 12 formed by this line n12 with respect to the reference line m20.
  • lines n11 and n12 correspond to predetermined position lines.
  • the reference line m20 is taken as a reference, that is, the reference line m20 is set to "0[°]", and the angle of deviation in the fan rotation direction F is represented by a positive value.
  • An angle deviating in the direction opposite to the direction F is represented by a negative value. Therefore, the skew angle ⁇ 11 at the position C11 of the blade 30 is a negative value, and the skew angle ⁇ 12 at the position C12 of the blade 30 is a positive value.
  • each blade 30 changes from the proximal end 31 toward the distal end 32 as shown in FIG.
  • the blade pitch P in FIG. It is a parameter normalized by a value in the range from 0 to 1.0. Therefore, the position of the blade 30 on the blade center line m30 where the blade pitch P is "0.5" is the center of the blade center line m30. Further, in FIG. 3, the blade pitch P corresponding to the bent portion 36 of the blade 30 is indicated by "Pc".
  • each blade 30 has a shape in which the skew angle ⁇ changes with respect to the blade pitch P as shown in FIG.
  • FIG. 4 shows the relationship between the inclination ⁇ of the skew angle ⁇ and the blade pitch P shown in FIG.
  • the change amount ⁇ of the inclination of the skew angle ⁇ of the blade 30 is "60 [°] ” to “90[°]”.
  • FIG. 5 shows the cross-sectional structure of the blade 30 along line VV shown in FIG.
  • the blade chord length LW when the length of a straight line n20 connecting the leading edge portion 33 and the trailing edge portion 35 in the cross section of the blade 30 is defined as "wing chord length LW", the blade chord length with respect to the blade pitch P LW is set as shown in FIG.
  • the chord length LW2 of the bent portion 36 of the blade 30 is longer than the chord length LW1 of the root portion 31 of the blade 30, and the chord length LW3 of the tip portion 32 of the blade 30 is the blade It is longer than the chord length LW2 of the bent portion 36 of 30.
  • each blade 30 is indicated by reference numeral 37, and the outer portion of the blade 30 from the bent portion 36 to the tip portion 32 is indicated by reference numeral 38. is indicated.
  • a straight line connecting one end portion 37a located at the base end portion 31 and the other end portion 37b located at the bent portion 36 in the front edge portion 33 of the inner portion 37 is indicated by a two-dot chain line u10.
  • the area projected vertically from the two-dot chain line u10 to the rear in the fan rotation direction F will be referred to as a "backward air flow area Aw”.
  • a blade arranged behind any one blade 30 in the fan rotation direction F is called an "adjacent blade 30a".
  • the blower fan 10 of this embodiment when the blower fan 10 rotates, an air flow is formed as indicated by arrows in FIG. That is, the flow direction W1 of the air that has passed through the inner portion 37 of the blade 30 is diagonalized in the direction toward the ring portion 40 . Also, the flow direction W2 of the air passing through the outer portion 38 of the blade 30 is the direction toward the outer portion 38 of the adjacent blade 30a. As a result, the air that has passed through the blades 30 is concentrated in the vicinity of the serrations 34 of the adjacent blades 30a, so that the noise reduction effect of the serrations 34 can be efficiently obtained. As a result, it is possible to obtain a noise reduction effect greater than the sum of the noise reduction effect achieved by the serration alone and the noise reduction effect achieved by the blade alone.
  • the blade 30 has a shape that directs the flow direction of the air passing through the blade 30 to the serration 34 of the adjacent blade 30a. According to this configuration, the air passing through the blades 30 easily flows toward the serrations 34 of the adjacent blade 30a, so that the effect of the serrations 34 can be enhanced. Therefore, it is possible to more accurately suppress noise while maintaining the air volume.
  • the skew angle ⁇ of the blade 30 gradually increases from the proximal end 31 to the bent portion 36 and reaches a maximum value at the bent portion 36. It has a shape in which the skew angle .theta. According to this configuration, it is possible to easily realize a shape in which the flow direction of the air passing through the blades 30 is directed toward the serrations 34 of the adjacent blades 30a.
  • the blade 30 has a shape in which the rear airflow region Aw of the inner portion 37 thereof does not overlap the entire region of the front edge portion 33 of the adjacent blade 30a. According to this configuration, the air passing through the inner portion 37 of the blade 30 can be easily concentrated on the serrations 34 of the adjacent blades 30a, so that the effect of the serrations 34 can be further improved.
  • a serration 34 consisting of a plurality of triangular projections is used as a divergence suppressing structure that suppresses divergence of the air flow from the blades 30 .
  • a serration 34 consisting of a plurality of triangular projections is used as a divergence suppressing structure that suppresses divergence of the air flow from the blades 30 .
  • the divergence of the air flow from the negative pressure surface of 30 can be suppressed more accurately. Therefore, the noise reduction effect can be improved.
  • the blower fan 10 includes the first blade 30b in which the rear airflow region Aw of the inner portion 37 does not overlap the entire region of the front edge portion 33 of the adjacent blade, and the rear airflow region Aw of the inner portion 37 is the front edge portion of the adjacent blade. 33 and a second blade 30c.
  • the blower fan 10 has four first blades 30b and three second blades 30c. Therefore, the number of first blades 30b is greater than the number of second blades 30c.
  • blower fan 10 of the present embodiment in addition to the actions and effects shown in (1) to (4) above, it is possible to obtain the action and effect shown in (5) below.
  • the plurality of blades 30 are arranged at different angular intervals in the fan rotation direction F. According to this configuration, it is possible to prevent the sound of a specific frequency from being emphasized when the blower fan 10 rotates, so that noise can be suppressed.
  • the above embodiment can also be implemented in the following forms.
  • the position of the serrations 34 on the blade 30 can be changed arbitrarily.
  • the serrations 34 may be formed, for example, on the trailing edge 35 of the tip 32 of the blade 30 as shown in FIG. 12, or on the leading edge 33 of the tip 32 of the blade 30 as shown in FIG. and the trailing edge 35 .
  • the divergence suppressing structure that suppresses the divergence of the air flow from the blade 30 is not limited to the serrations 34, but may be a concave portion 50 shown in FIG. 14, a convex portion 51 called a vortex generator shown in FIG. good too.
  • the present disclosure is not limited to the above specific examples. Appropriate design changes made by those skilled in the art to the above specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure.
  • Each element included in each specific example described above, and its arrangement, conditions, shape, etc., are not limited to those illustrated and can be changed as appropriate. As long as there is no technical contradiction, the combination of the elements included in the specific examples described above can be changed as appropriate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
PCT/JP2022/022790 2021-07-02 2022-06-06 送風ファン Ceased WO2023276570A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280043958.1A CN117545927A (zh) 2021-07-02 2022-06-06 送风风扇
US18/514,403 US12297840B2 (en) 2021-07-02 2023-11-20 Blower fan

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-110939 2021-07-02
JP2021110939A JP7615925B2 (ja) 2021-07-02 2021-07-02 送風ファン

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/514,403 Continuation US12297840B2 (en) 2021-07-02 2023-11-20 Blower fan

Publications (1)

Publication Number Publication Date
WO2023276570A1 true WO2023276570A1 (ja) 2023-01-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/022790 Ceased WO2023276570A1 (ja) 2021-07-02 2022-06-06 送風ファン

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US (1) US12297840B2 (https=)
JP (1) JP7615925B2 (https=)
CN (1) CN117545927A (https=)
WO (1) WO2023276570A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119129114A (zh) * 2024-11-15 2024-12-13 中国航发商用航空发动机有限责任公司 提供开式转子发动机反推力的设计方法、计算机可读介质、计算机程序产品、开式转子发动机以及风扇叶片

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1060648S1 (en) * 2023-02-02 2025-02-04 Phillip S. Eggers Blade for an industrial air-circulation fan
KR20260042962A (ko) * 2024-09-23 2026-03-31 삼성전자주식회사 공기조화기의 실외기

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5880288B2 (ja) * 2012-05-31 2016-03-08 株式会社デンソー 送風機
CN110145491A (zh) * 2019-07-07 2019-08-20 代元军 一种叶片叶尖后缘呈锯齿型结构的矿用局部轴流式通风机

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0214500U (https=) * 1988-07-14 1990-01-30
US5273400A (en) * 1992-02-18 1993-12-28 Carrier Corporation Axial flow fan and fan orifice
DE69820853T2 (de) * 1998-03-23 2004-11-18 Spal S.R.L., Correggio Axiallüfter
ITBO20040507A1 (it) * 2004-08-05 2004-11-05 Spal Srl Ventola a flusso assiale

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5880288B2 (ja) * 2012-05-31 2016-03-08 株式会社デンソー 送風機
CN110145491A (zh) * 2019-07-07 2019-08-20 代元军 一种叶片叶尖后缘呈锯齿型结构的矿用局部轴流式通风机

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119129114A (zh) * 2024-11-15 2024-12-13 中国航发商用航空发动机有限责任公司 提供开式转子发动机反推力的设计方法、计算机可读介质、计算机程序产品、开式转子发动机以及风扇叶片

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Publication number Publication date
US12297840B2 (en) 2025-05-13
CN117545927A (zh) 2024-02-09
JP2023007842A (ja) 2023-01-19
JP7615925B2 (ja) 2025-01-17
US20240084814A1 (en) 2024-03-14

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