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WO2015147461A1 - Ventilateur centrifuge - Google Patents

Ventilateur centrifuge Download PDF

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Publication number
WO2015147461A1
WO2015147461A1 PCT/KR2015/002236 KR2015002236W WO2015147461A1 WO 2015147461 A1 WO2015147461 A1 WO 2015147461A1 KR 2015002236 W KR2015002236 W KR 2015002236W WO 2015147461 A1 WO2015147461 A1 WO 2015147461A1
Authority
WO
WIPO (PCT)
Prior art keywords
back plate
centrifugal fan
end portion
shroud
discharge end
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/KR2015/002236
Other languages
English (en)
Inventor
Taeman Yang
Woojoo Choi
Dongkyun Im
Choonmyun Chung
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.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 LG Electronics Inc filed Critical LG Electronics Inc
Priority to US15/124,899 priority Critical patent/US20170023001A1/en
Publication of WO2015147461A1 publication Critical patent/WO2015147461A1/fr
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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • 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
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • 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
    • F04D29/288—Part of the wheel having an ejecting effect, e.g. being bladeless diffuser
    • 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • 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
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes

Definitions

  • the present invention relates to a centrifugal fan, and more particularly, to a centrifugal fan capable of maximizing efficiency of a diffuser to reduce flow noise.
  • blower fans for forcibly blowing gas are installed in home appliances such as an air conditioner or ventilation systems of factory equipment.
  • blower fans may be classified into an axial fan and a centrifugal fan according to flow characteristics of blowing gas.
  • the axial fan is a blower fan in which gas flow is generated in parallel with a rotary shaft.
  • the centrifugal fan is a blower fan in which gas flow at an inlet of each blade is generated in a direction of a rotary shaft but gas flow at an outlet of the blade is generated in a radial direction perpendicular to the rotary shaft.
  • the axial fan has a disadvantage that static pressure performance is very low due to a structure thereof. Thus, a size of the blade or a rotation speed of the fan should be increased in order to increase the static pressure performance in the axial fan.
  • FIG. 1 is a cross-sectional view illustrating an example of a circular compressor in which a bell mouth 200 is coupled to the conventional centrifugal fan 100.
  • the centrifugal fan 100 may be coupled to the bell mouth 200 which is arranged at an introduction side of fluid with respect to the centrifugal fan 100 and has an inner diameter that gradually decreases toward the centrifugal fan 100.
  • the fluid introduced into the bell mouth may be guided in a direction of a rotation center shaft of the centrifugal fan 100 through a shroud 110 to be described later.
  • the centrifugal fan 100 includes a back plate 130 having a central portion for coupling with the rotation center shaft.
  • a plurality of blades 120 which aids in movement of the fluid and transfers energy to the fluid, is arranged at the back plate 130.
  • centrifugal fan 100 may include the shroud 110 coupled to end portions of the blades 120.
  • the shroud 110 defines a movement passage of the fluid together with the blades 120.
  • the centrifugal fan 100 may include a diffuser 140 for increasing a pressure of the fluid.
  • the diffuser 140 serves to increase the pressure of the fluid by decreasing the speed of the fluid passing through the inside of the centrifugal fan 100.
  • the diffuser 140 may be formed at both tip ends of the shroud 110 and the back plate 130. As shown in FIG. 1, discharge end portions of the diffuser 140, namely, discharge end portions of the shroud 110 and back plate 130 through which the fluid is discharged, generally have a chamfered shape.
  • An object of the present invention devised to solve the problem is to provide a centrifugal fan including a diffuser capable of minimizing vortex generation.
  • Another object of the present invention devised to solve the problem is to provide a centrifugal fan capable of increasing efficiency of a diffuser by decreasing a vortex generated on a surface of a shroud to reduce torque of fluid.
  • a further object of the present invention devised to solve the problem is to provide a centrifugal fan capable of increasing efficiency of a diffuser so that abnormal temperature increase of fluid is prevented and compression performance of a compressor is increased.
  • the object of the present invention can be achieved by providing a centrifugal fan including a back plate having a central portion for coupling with a rotation center shaft, a plurality of blades extending from the back plate, and a shroud having a circular ring shape and connected to end portions of the blades.
  • the shroud may include an introduction end portion through which fluid is introduced, a connection portion curved to have a diameter that gradually increases from the introduction end portion, and a discharge end portion through which the fluid is discharged via the connection portion, and the discharge end portion may be rounded in a direction away from the back plate.
  • the discharge end portion of the shroud and a circumferential portion of the back plate may be rounded in opposite directions to each other.
  • the back plate may include a connection portion which extends in a radial direction of the back plate from the central portion and connects the central portion to a circumferential portion.
  • the discharge end portion of the shroud and the circumferential portion of the back plate may form a diffuser.
  • the circumferential portion may be rounded in a direction away from the discharge end portion of the shroud. That is, a distance between the discharge end portion of the shroud and the circumferential portion of the back plate may be gradually increased in a discharge direction of the fluid.
  • the central portion may protrude toward the introduction end portion. That is, the back plate may be continuously rounded from the central portion to the circumferential portion of the back plate.
  • the discharge end portion may have a larger curvature than the connection portion, and the curvature of the discharge end portion may be equal to or more than a single arc (1arc).
  • centrifugal fan capable of increasing efficiency of a diffuser by decreasing a vortex generated on a surface of a shroud to reduce torque of fluid.
  • centrifugal fan capable of increasing the efficiency of the diffuser so that abnormal temperature increase of fluid is prevented and compression performance of a compressor is increased.
  • FIG. 1 is a cross-sectional view illustrating an example of a circular compressor in which a bell mouth is coupled to a conventional centrifugal fan;
  • FIG. 2 is a perspective view illustrating a centrifugal fan according to an exemplary embodiment of the present invention
  • FIG. 3 is a cross-sectional view illustrating a circular compressor in which a bell mouth is coupled to the centrifugal fan according to the exemplary embodiment of the present invention
  • FIG. 4 is an enlarged cross-sectional view illustrating both tip ends of a shroud according to the exemplary embodiment of the present invention
  • FIGS. 5 and 6 are cross-sectional views illustrating a circular compressor including a centrifugal fan according to another exemplary embodiment of the present invention
  • FIG. 7 is a table illustrating a comparison of efficiency of diffusers according to the related art and the exemplary embodiments of the present invention.
  • FIG. 8 is a graph illustrating P-Q performance measured according to the related art and the exemplary embodiments of the present invention.
  • FIG. 9 is a graph illustrating the efficiency of the diffusers according to the related art and the exemplary embodiments of the present invention.
  • each component or feature may be selectively considered.
  • Each component or feature may be embodied in a form which is not combined with another component or feature.
  • the embodiments of the present invention may also be configured by combination of partial components and/or features. A partial configuration or feature of any embodiment may be incorporated in other embodiments, or may be replaced with the corresponding configuration or feature of the other embodiments.
  • FIG. 2 is a perspective view illustrating a centrifugal fan 100 according to an exemplary embodiment of the present invention. A structure of the centrifugal fan 100 according to the exemplary embodiment of the present invention will be described with reference to FIG. 2.
  • the centrifugal fan 100 may include a back plate 130 having a central portion 131 for coupling with a rotation center shaft, and a plurality of blades 120 extending from the back plate 130. Each blade may extend such that an outer contour thereof is curved.
  • the blades 120 form rotary vanes of the centrifugal fan 100 and function to transfer kinetic energy of the centrifugal fan 100 to fluid.
  • the plurality of blades 120 may be provided at predetermined intervals and radially arranged on the back plate 130.
  • the centrifugal fan 100 may include a shroud 110 coupled to end portions of the blades 120.
  • the shroud 110 may be formed at a position facing the back plate 130, and have a circular ring shape.
  • the shroud 110 has an introduction end portion 111 through which the fluid is introduced, and a discharge end portion 113 through which the fluid is discharged.
  • the shroud may be curved so as to have a diameter decreased toward the introduction end portion 111 from the discharge end portion 113.
  • the shroud 110 may include a connection portion 112 which connects the introduction end portion 111 to the discharge end portion 113 in a curved form.
  • the connection portion may have a curvature and be rounded such that an inside cross-sectional area of the shroud is enlarged.
  • the shroud 110 may define a movement passage of the fluid together with the back plate 130 and the blades 120.
  • the fluid introduced in a direction of the center shaft may flow in a circumferential direction of the centrifugal fan 100 by rotation of the blades 120.
  • the centrifugal fan 100 may discharge the fluid in a radial direction of the centrifugal fan 100 by increasing flow speed with centrifugal force.
  • the centrifugal fan 100 may include a diffuser 140 for converting kinetic energy of the fluid into pressure energy. The speed of the fluid is decreased while the fluid accelerated in the circumferential direction by rotation of the centrifugal fan 100 is diffused, and the kinetic energy of the fluid may be converted into an effective pressure.
  • the diffuser for increasing the pressure of the fluid may be formed by the shroud 110 and the back plate 130.
  • the shroud 110 coupled to the end portions of the blades 120 may be spaced apart from the back plate 130 by a predetermined distance.
  • the shroud 110 has a surface which is parallel with and faces the back plate 130.
  • the diffuser 140 is formed between both tip ends of the shroud 110 and back plate 130. That is, the discharge end portion 113 of the shroud 110 through which the fluid is discharged and a circumferential portion 132 of the back plate may serve as a diffuser.
  • the efficiency of the diffuser may be measured by dividing the product of a pressure P and a quantity of flow Q of fluid by the product of torque and revolutions per minute (RPM).
  • RPM revolutions per minute
  • FIG. 3 is a cross-sectional view illustrating a circular compressor in which a bell mouth 200 is coupled to the centrifugal fan 100 according to the exemplary embodiment of the present invention.
  • the centrifugal fan 100 is not limited to being applied to the above-mentioned embodiments, and the centrifugal fan 100 according to the present invention is applied as long as it may change pressures and speeds of fluid by rotation.
  • the discharge end portion 113 of the shroud 110 forming the diffuser may be rounded to have a predetermined curvature.
  • the discharge end portion 113 of the shroud 110 is preferably rounded in a direction away from the back plate 130.
  • the curvature through which the discharge end portion of the shroud or the circumferential portion of the back plate is rounded may be provided such that a length L defined from a starting point of the rounded portion of the shroud 110 to the tip end of the shroud 100 and a height H of the shroud 110 are a single arc (1arc) or a double arc (2arc).
  • the discharge end portion 113 may have a larger curvature than the connection portion 112. That is, the discharge end portion is preferably rounded with a larger curvature than the circumferential portion in the direction away from the back plate.
  • a back plate 130 and a shroud 110 are both optimized in order to increase efficiency of a diffuser.
  • both of a discharge end portion 113 of the shroud 110 and a circumferential portion 132 of the back plate 130 may have a curvature and are rounded.
  • circumferential portion 132 of the back plate 130 and the discharge end portion 113 of the shroud 110 may be rounded in opposite directions to each other.
  • a distance between the discharge end portion 113 of the shroud 110 and the circumferential portion 132 of the back plate 130 be gradually increased in a discharge direction of fluid.
  • the circumferential portion 132 of the back plate 130 is rounded in an arc form, the distance between the shroud 110 and the back plate 130 is gradually increased toward both tip ends thereof.
  • the curvature may be provided to be a single arc (1arc) or a double arc (2arc), but the present invention is not limited thereto.
  • the back plate may be rounded to both ends from a central portion 131 which is the highest portion. That is, the central portion may protrude toward an introduction end portion 111.
  • the back plate may be formed in a parabolic form extending from the central portion 131 of the back plate to the circumferential portion 132 thereof.
  • the back plate is continuously rounded from the central portion 131 to the circumferential portion 132 thereof.
  • a distance between an imaginary line connecting the lowest points of the discharge end portion 113 of the shroud 110 and the back plate 130 is preferably the closest in the central portion 131 provided in the back plate 130.
  • the diffuser 140 (hereinafter, referred to as OPT.1 ) of the embodiment in which the discharge end portion of the shroud 110 is rounded to have a predetermined curvature may improve efficiency by 0.57%, compared to the conventional diffuser 140 shown in FIG. 1 in which the discharge end of the diffuser 140 has the chamfered shape instead of having a curvature.
  • the diffuser (hereinafter, referred to as OPT.2 ) of the embodiment in which the central portion 131 of the back plate 130 protrudes toward the introduction end portion 111 may improve efficiency by 0.93%, compared to the conventional diffuser 140.
  • the diffuser 140 may have the highest efficiency.
  • the efficiency of the diffuser may be increased.
  • the exemplary embodiments of the present invention described above have been designed to minimize a vortex generated by the diffuser 140.
  • torque of the fluid is decreased.
  • efficiency of the diffuser is increased.
  • P-Q static pressure curves of the OPT.1 and OPT.3 are little difference from that of the conventional diffuser 140. That is, the P-Q performance according to variations of the pressure and the quantity of flow may be almost identical even though the shapes of the shroud 110 and back plate 130 are changed.
  • the efficiency of the OPT.1 or the OPT.3 may be improved compared to that of the conventional diffuser 140, as shown in FIG. 9.
  • the efficiency of the OPT.2 may also be significantly improved compared to that of the conventional diffuser 140, under the quantity of flow which is equal to or less than about 170 CMM.
  • the OPT.3 may have the maximum efficiency. That is, when both of the shroud 110 and the back plate 130 are rounded with a predetermined curvature, the diffuser may have the highest efficiency.
  • centrifugal fan 100 The configuration and method of the above-mentioned centrifugal fan 100 are not limited to the above embodiments, and the entirety or a portion of each embodiment may be selectively combined such that various modifications may be made in the embodiments.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention porte sur un ventilateur centrifuge. Le ventilateur centrifuge comprend une plaque arrière ayant une partie centrale pour un couplage avec un arbre central de rotation, une pluralité de pales s'étendant à partir de la plaque arrière, et un carénage qui est relié à des parties d'extrémité des pales, et qui a une partie d'extrémité d'introduction et une partie d'extrémité de décharge à travers lesquelles passe un fluide, la partie d'extrémité de décharge étant arrondie avec une courbure prédéterminée dans une direction s'éloignant à partir de la plaque arrière.
PCT/KR2015/002236 2014-03-27 2015-03-09 Ventilateur centrifuge Ceased WO2015147461A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US15/124,899 US20170023001A1 (en) 2014-03-27 2015-03-09 Centrifugal fan

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0035812 2014-03-27
KR1020140035812A KR101625061B1 (ko) 2014-03-27 2014-03-27 원심팬

Publications (1)

Publication Number Publication Date
WO2015147461A1 true WO2015147461A1 (fr) 2015-10-01

Family

ID=54195921

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2015/002236 Ceased WO2015147461A1 (fr) 2014-03-27 2015-03-09 Ventilateur centrifuge

Country Status (3)

Country Link
US (1) US20170023001A1 (fr)
KR (1) KR101625061B1 (fr)
WO (1) WO2015147461A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021204491A1 (de) 2021-05-04 2022-11-10 Ziehl-Abegg Se Ventilator, insbesondere Radial- oder Diagonalventilator

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
CN107642491B (zh) * 2017-11-02 2024-03-12 洛阳北玻三元流风机技术有限公司 动车、高铁牵引变压器冷却用三元流化离心风机
CN109899319B (zh) * 2019-04-08 2024-09-10 中山宜必思科技有限公司 一种后向离心风轮
MX2021010819A (es) * 2019-04-08 2021-10-01 Zhongshan Ebs Tech Co Ltd Ventilador centrifugo con paletas hacia atras.
KR102342194B1 (ko) * 2021-02-16 2021-12-23 주식회사 삼인비엔에프 고효율 저소음 송풍기
KR20250014744A (ko) 2023-07-21 2025-02-03 엘지전자 주식회사 원심팬 및 그 제조방법

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JP2010144698A (ja) * 2008-12-22 2010-07-01 Ihi Corp 遠心圧縮機
JP2011208558A (ja) * 2010-03-29 2011-10-20 Mitsubishi Heavy Ind Ltd 遠心式流体機械
KR20120023320A (ko) * 2010-09-02 2012-03-13 엘지전자 주식회사 공기조화기용 터보팬

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Publication number Priority date Publication date Assignee Title
DE102021204491A1 (de) 2021-05-04 2022-11-10 Ziehl-Abegg Se Ventilator, insbesondere Radial- oder Diagonalventilator

Also Published As

Publication number Publication date
KR101625061B1 (ko) 2016-05-27
US20170023001A1 (en) 2017-01-26
KR20150112200A (ko) 2015-10-07

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