US20150152875A1 - Air blower - Google Patents

Air blower Download PDF

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Publication number
US20150152875A1
US20150152875A1 US14/404,259 US201314404259A US2015152875A1 US 20150152875 A1 US20150152875 A1 US 20150152875A1 US 201314404259 A US201314404259 A US 201314404259A US 2015152875 A1 US2015152875 A1 US 2015152875A1
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US
United States
Prior art keywords
blade
serrations
flow
blower
air
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.)
Abandoned
Application number
US14/404,259
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English (en)
Inventor
Masaru Kamiya
Hideki Ooya
Kenji Yoshida
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
Assigned to DENSO CORPORATION reassignment DENSO CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OOYA, Hideki, KAMIYA, MASARU, YOSHIDA, KENJI
Publication of US20150152875A1 publication Critical patent/US20150152875A1/en
Abandoned 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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/002—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying geometry within the pumps, e.g. by adjusting vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • 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

Definitions

  • the present invention relates to an axial flow blower, centrifugal blower, diagonal flow blower, etc., more particularly relates to a structure of a fan blade which can suppress disturbances in the air flow and reduce noise.
  • PLT 1 discloses providing a plurality of triangular shape projections in a sawtooth manner (hereinafter referred to as “serrations”) in a chord line direction with an all leading edge part of each blade to reduce the noise of rotation due to the blower fan.
  • the flow of air near a blade surface of a blower greatly differs depending on the part.
  • the direction of the air flow at the outer circumference side of the blower fan, with respect to the direction of rotation greatly changes depending on the design of the blade (forward curved blade or backward curved blade). That is, in a forward curved blade (forward swept wing), the flow becomes an axial flow which concentrates at the blade center, while in a backward curved blade (sweptback wing), the flows becomes a slanted flow which heads toward the blade outer circumferential direction.
  • a back flow also occurs from a positive pressure surface to a negative pressure surface side.
  • serrations which were provided with a blade could not sufficiently suitably deal with changes in the flow of air depending on the portion of the blade and a sufficient noise reduction effect sometimes could not be obtained. Further, a drop in the air flow was sometimes caused or the drive torque increased and a drop in efficiency was caused.
  • PLT 1 Japanese Unexamined Patent Publication No. 2000-087898
  • the present invention in consideration of the problem, provides a blower which prevents a drop in the air flow while effectively reducing the fan noise.
  • an aspect of the invention of claim 1 provides a blower comprising a drive motor and a blower fan having a hub which is attached to the drive motor, and a plurality of blades which are provided at the hub, wherein the blades are provided at their blade leading edge parts with serrations comprised of pluralities of triangular shape projecting parts along the blade leading edge parts and the serrations are changed in pitch, height, or direction according to the flows of air at radial direction positions of the blower fan.
  • an aspect of the invention of claim 10 provides a blower fan having a hub which adapts to be attached to a drive unit, and a plurality of blades which are provided at said hub, wherein
  • each said blade has a first portion of a blade leading edge part of said blade which has a first distance in the radial direction from the center of rotation of said blade, and a second portion of a blade leading edge part of said blade which has a second distance in the radial direction from the center of rotation of said blade, said blade leading edge part is provided with a plurality of serrations which stick out to an upstream side of flow of air, wherein said serrations have first slanted sides which are slanted with respect to a direction of flow of air, and second slanted sides which are slanted in a different direction from said first slanted sides with respect to a direction of flow of air, and at least one of a pitch, height, and direction of said projections at said first portion differs from at least one of a pitch, height, and direction of said projections at said second portion.
  • the parenthesized reference notations show the correspondence with specific examples which are described in the later mentioned embodiments.
  • FIG. 1 is a front schematic view of a first embodiment of the present invention.
  • FIG. 2 is a schematic view of a blade of a first embodiment of the present invention.
  • FIG. 3 is a view of one example of the results of simulation analyzing the structure of the flow around leading edge serrations by CFD (computational fluid dynamics).
  • FIG. 4 is an explanatory view of the results of simulation of FIG. 3 .
  • FIG. 5 is a cross-sectional view of a blade of the simulation of FIG. 3 .
  • FIG. 6A is an explanatory view for explaining a general axial flow blower.
  • FIG. 6B is a cross-sectional view developed along the line A-A of FIG. 6A .
  • FIG. 6C is an explanatory view for explaining a positive pressure surface and a negative pressure surface of a blade of FIG. 6B .
  • FIG. 7 is a schematic view of a blade of a second embodiment of the present invention.
  • FIG. 8 is a schematic view of a blade of a third embodiment of the present invention.
  • FIG. 9 is a schematic view of a blade of a fourth embodiment of the present invention.
  • FIG. 10 is a schematic view of a blade of a fifth embodiment of the present invention.
  • FIG. 11 is a schematic view of a blade of a sixth embodiment of the present invention.
  • FIG. 12 is a schematic view of a blade of a seventh embodiment of the present invention.
  • FIG. 13 is a schematic view of a blade of an eighth embodiment of the present invention.
  • FIG. 14 is a schematic view of a blade of a ninth embodiment of the present invention.
  • a blower 10 is a so-called electric blower comprising a blower fan 1 which is placed in a shroud 200 and which is driven to rotate by a drive motor (electric motor) 300 .
  • the blower 10 is fastened to an engine side of an automobile radiator by mounts 250 which are provided near the four corners of the shroud 200 and blows air for cooling use to the core part of the radiator.
  • the outside shape of the shroud 200 forms a rectangular shape corresponding to the core part of the radiator.
  • a ring-shaped shroud ring part 210 is formed so as to encircle the blower fan 1 by its outer circumference.
  • This shroud ring part 210 is provided at the shroud 200 so as to be positioned at the outside of the ring 2 of the blower fan 1 in the radial direction. There may also be no ring 2 of the blower fan 1 in the present embodiment.
  • the blower 10 and the later explained blades 3 of the present invention are not limited to use for an automobile radiator. They are may be used for general industrial use. The explanation will mainly be given for an axial flow blower, but similar effects can be obtained even for a centrifugal blower, diagonal flow blower, and cross-flow blower.
  • the drive motor 300 is not necessarily limited to an electric motor.
  • an air conduit 220 is formed which expands toward the upstream side of air of the blower fan 1 .
  • a circular motor holding part 230 is formed at the center of the shroud ring part 210 .
  • This motor holding part 230 is supported by a plurality of motor stays 240 which extend radiately to the outside in the radial direction and are connected to the shroud ring part 210 .
  • an electric motor 300 is fastened at the motor holding part 230 .
  • the shaft of the electric motor 300 and the hub 4 of the blower fan 1 (see FIG. 2 ) are fastened.
  • the blower 10 comprises this blower fan 1 , electric motor 300 , etc.
  • the hub 4 of the blower fan 1 is cylindrical in shape and is provided with a plurality of blades 3 in the radial direction.
  • Parameters of the blades 3 such as the chord line C, positive pressure surface, negative pressure surface, angle of attack a, lift, etc. are the same as the general definitions such as shown in FIGS. 6A to 6C . Further, a blade shape where the blade end part at the outer circumference side is curved backward in the direction of rotation of the blower fan 1 will be called a “backward curved blade”, while a blade shape where the blade end part at the outer circumference side is curved forward in the direction of rotation of the blower fan 1 will be called a “forward curved blade”. At the blade leading edge part of the blade 3 , a plurality of serrations (triangular shape projecting parts) are formed.
  • the serrations have first slanted sides 3 a which are slanted with respect to the direction of flow of air and second slanted sides 3 b which are slanted in a different direction from the first slanted sides 3 a with respect to the direction of flow of air (see FIG. 7 ).
  • the bottom side of the triangular shape projecting part will be called the “pitch p” of the serrations (triangular shape projecting parts)
  • the line segment bisecting the vertex a of the triangular shape projecting part will be called the “direction” of the serrations (triangular shape projecting parts)
  • the distance of the bisecting line segment of the vertex to the bottom side will be called the “height h” of the serrations (triangular shape projecting parts).
  • the larger “size” of the serrations (triangular shape projecting parts) indicates the larger of the pitch or height of the serrations.
  • the vertexes a of the triangular shape projecting parts are called vertexes a of the serrations. In the case where the sides of the triangular shapes are curved, the shapes are generally based on these.
  • FIG. 3 is a view of a blade leading edge as seen from an upper position.
  • the arrow marks which are shown in FIG. 3 show projections of the tangential velocity of the flows around the serrations on the projection plane of the X-Z plane (S plane of FIG. 4 ).
  • a flow from the valley parts at the two sides to the top surface of a peak part can be seen as occurring.
  • small vortexes occur. These grow to large vortexes further toward the valleys.
  • the first embodiment of the present invention is an embodiment changing the pitch, height, or direction of the serrations according to the flow of air at the radial direction position of the blower fan 1 , in order to utilize the above basic effect of the serrations. That is, the first embodiment differs in at least one of the pitch, height, and direction of serrations in the first portion and second portion which are different in distance in the radial direction of the blower fan from the center Q of rotation of the blade 3 .
  • the first portion and second portion of the blade 3 parts differing in the flow rate of air (flow rates of FIGS. 7 and 8 ) and directions of flow etc. may be mentioned. However the invention is not limited to these portions, but portions of any two locations along the blade 3 .
  • the flow of air near the blade surfaces of the blower greatly differ depending on the portion.
  • the flow becomes an axial flow which concentrates at the blade center
  • the flow becomes a diagonal flow which heads toward the outer circumferential direction of the blade.
  • a back flow arises from the positive pressure surface to the negative pressure surface.
  • the first embodiment is a fan which is characterized by providing flow control shapes which minimize the noise which is produced due to disturbance of the air at different positions of the blades. Due to the flow control shapes, the effect is obtained of both noise reduction and prevention of a drop in the air flow and increase of the drive torque.
  • the blades have serration shape (sawtooth teeth) portions.
  • the serration shapes are changed according to the flow of air. According to this, it is possible to suitably set the serration shapes at the individual portions which differ in direction of air flow and flow rate, so it is possible to realize the effect of both noise reduction and the prevention of both a drop of the air flow and increase of the drive torque.
  • the second and third embodiments are embodiments corresponding to the case where the air near a blade surface of the blower flows in the circumferential direction of the blower fan.
  • the second embodiment as shown in FIG. 7 , is characterized in that the further to the blade outside diameter side the blade is, the larger the sizes of the serrations are made.
  • the serrations are directed toward the circumferential direction of the blower fan. According to this, the size of the serrations is increased at the portion with a large flow rate at the blade outer circumference side, and the whirled air flow which is formed at the serrations, becomes weaker at a portion further toward the blade inside circumference side and becomes stronger at a portion further toward the blade outer circumference side.
  • the third embodiment is characterized in that the further to the blade outside diameter side the blade is, the more acute the vertices a of the serrations is.
  • the serration angle is made acute at the portion of the large flow rate at the blade outer circumference side, and the whirled air flow which is formed at the serrations becomes weaker at a portion further to the blade inside circumference side and becomes stronger at a portion further to the blade outer circumference side. Due to this, at the flow with a high flow rate where flow separation would easily occur, it is possible to strengthen the downward flow at the blade surfaces formed at the serration valley parts in order to achieve both noise reduction, and prevention of both a drop in air flow and increase in drive torque in the blade as a whole.
  • the invention is not limited to the case of making the pitch p of the serrations constant and increasing the height h of the serrations to make the angle acute. It is also possible to make the serration angle acute, regardless of the length of the bottom sides of the triangular shaped projections, at the portions with a large flow rate at the blade outer circumference side.
  • the fourth embodiment is characterized in that the blade trailing edge 7 is also provided with serrations and in that the blade leading edge 6 and blade trailing edge 7 are changed in serration shapes.
  • the blade trailing edge 7 is provided with serrations, since the flow at the high pressure blade positive pressure surface and the flow at the low pressure blade negative pressure surface are mixed near the blade trailing edge, the flows of the two surfaces gradually cross due to the serrations, so it is possible to suppress the disturbances in the flow of air of the blade trailing edge.
  • the blade leading edge 6 and the blade trailing edge 7 may be suitably set with serration shapes.
  • the serrations at the blade leading edge side which are provided for suppressing flow separation, can be made larger so as to form a radiated flow.
  • the serrations at the blade trailing edge side which are provided for suppressing disturbances of the air flow, can be made smaller so as to make the flows at the positive and negative pressure surfaces gradually cross. Therefore, the effect is obtained of both noise reduction, and the prevention of both a drop in the air flow and increase of the drive torque. It is also possible to change the range of provision of serrations between the blade trailing edge and the blade leading edge, and possible to provide serrations at only suitable positions of the blade leading edge 6 and blade trailing edge 7 .
  • the fifth embodiment is an embodiment corresponding to the case where the flow of air near the blade surfaces of the blower is a diagonal flow.
  • the fifth embodiment matches the direction of the serrations of the blade leading edge with the direction of diagonal flow.
  • the sixth embodiment is characterized by changing the range of provision of serrations between the blade trailing edge 7 and the blade leading edge 6 . For example, when the air flow becomes a diagonal flow such as with a backward curved blade, the air flows on the blade surface in the direction to the outer circumference, from the blade leading edge 6 toward the blade trailing edge 7 .
  • the following seventh and eighth embodiments are embodiments corresponding to the case where the flow of air near the blade surface of the blower is a back flow from the positive pressure surface of the blade end part to the negative pressure surface side.
  • the seventh embodiment is characterized by making the serration shapes of the blade end part smaller. According to this, the serration shapes are made smaller at the blade end part where the disturbance of the air flow due to the back flow is large, so the swirl of the air flow formed at the serrations is subdivided. Due to this, the disturbance of the air flow at the blade end part can be reduced, so the effect is obtained of noise reduction, and prevention of both a drop in air flow and increase of drive torque.
  • the eighth embodiment is characterized by making the serration shapes of the blade end part at the blade trailing edge 7 smaller. Operational effects similar to the seventh embodiment are obtained.
  • the ninth embodiment is an embodiment which makes the direction of the serrations of the blade leading edge 6 match the direction of diagonal flow and makes the serration shapes of the blade end part match the air flow due to the back flow, so as to deal with the flow of air near the blade surface of the blower.
  • the ninth embodiment is included in the first embodiment. According to this, it is possible to set the direction of the serrations to match the direction of flow, so the effect is obtained of noise reduction, and prevention of both a drop in air flow and increase in drive torque.
  • combinations of the fifth and sixth embodiments for the diagonal flow and the seventh and eighth embodiments for the back flow is included in the ninth embodiment.
  • the present invention was described with reference to specific embodiments selected in accordance with the purpose of illustration, but it is clear that a person skilled in the art could conceive of numerous modifications without departing from the basic concept of the present invention and scope of disclosure of the same.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US14/404,259 2012-05-31 2013-05-31 Air blower Abandoned US20150152875A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2012-124250 2012-05-31
JP2012124250A JP5880288B2 (ja) 2012-05-31 2012-05-31 送風機
PCT/JP2013/065282 WO2013180296A1 (ja) 2012-05-31 2013-05-31 送風機

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US20150152875A1 true US20150152875A1 (en) 2015-06-04

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US14/404,259 Abandoned US20150152875A1 (en) 2012-05-31 2013-05-31 Air blower

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US (1) US20150152875A1 (zh)
JP (1) JP5880288B2 (zh)
CN (1) CN104364532B (zh)
DE (1) DE112013002698T5 (zh)
WO (1) WO2013180296A1 (zh)

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US20180180062A1 (en) * 2015-06-16 2018-06-28 Resmed Limited Impeller with inclined and reverse inclined blades
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US10473113B2 (en) 2015-12-16 2019-11-12 Denso Corporation Centrifugal blower
US20200072233A1 (en) * 2016-12-16 2020-03-05 Gree Electric Appliances, Inc. Of Zhuhai Centrifugal Fan Blade Assembly and Centrifugal Fan
USD901669S1 (en) 2017-09-29 2020-11-10 Carrier Corporation Contoured fan blade
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US11187083B2 (en) 2019-05-07 2021-11-30 Carrier Corporation HVAC fan
US20220003242A1 (en) * 2018-11-22 2022-01-06 Gd Midea Air-Conditioning Equipment Co., Ltd. Axial-flow impeller and air-conditioner having the same
CN114738319A (zh) * 2022-04-20 2022-07-12 浙江尚扬通风设备有限公司 低噪声轴流风机及其使用方法
US20220307519A1 (en) * 2021-03-26 2022-09-29 Champ Tech Optical (Foshan) Corporation Impeller with improved heat dissipation performance and reduced noise and heat dissipation fan having the same
US11560796B2 (en) * 2018-10-18 2023-01-24 Safran Aircraft Engines Profiled structure for an aircraft or turbomachine for an aircraft
USD980965S1 (en) 2019-05-07 2023-03-14 Carrier Corporation Leading edge of a fan blade
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WO2018179075A1 (ja) * 2017-03-28 2018-10-04 三菱電機株式会社 プロペラファン
DE102017212231A1 (de) * 2017-07-18 2019-01-24 Ziehl-Abegg Se Flügel für das Laufrad eines Ventilators, Laufrad sowie Axialventilator, Diagonalventilator oder Radialventilator
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CN113738700B (zh) * 2020-05-27 2023-06-02 广东美的白色家电技术创新中心有限公司 风机、空调室外机和空调系统
CN112012960B (zh) * 2020-08-03 2021-06-22 珠海格力电器股份有限公司 风叶组件、风机组件和空调器
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DE112013002698T5 (de) 2015-02-26
JP2013249762A (ja) 2013-12-12

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