WO2006126408A1 - Centrifugal blower and air conditioner using the same - Google Patents

Centrifugal blower and air conditioner using the same Download PDF

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Publication number
WO2006126408A1
WO2006126408A1 PCT/JP2006/309633 JP2006309633W WO2006126408A1 WO 2006126408 A1 WO2006126408 A1 WO 2006126408A1 JP 2006309633 W JP2006309633 W JP 2006309633W WO 2006126408 A1 WO2006126408 A1 WO 2006126408A1
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WO
WIPO (PCT)
Prior art keywords
shroud
main plate
centrifugal blower
blade
thickness
Prior art date
Application number
PCT/JP2006/309633
Other languages
French (fr)
Japanese (ja)
Inventor
Kaku Okada
Original Assignee
Toshiba Carrier Corporation
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 Toshiba Carrier Corporation filed Critical Toshiba Carrier Corporation
Priority to JP2007517774A priority Critical patent/JP4693842B2/en
Priority to EP06746380A priority patent/EP1887227A1/en
Publication of WO2006126408A1 publication Critical patent/WO2006126408A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30Vanes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05DINDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00Components
    • F05D2240/20Rotors
    • F05D2240/30Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/303Characteristics 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 a centrifugal blower and an air conditioner, and more particularly, to a blower with an improved blade front edge shape on the shroud side and an air conditioner using the same.
  • a ceiling fan In general, a ceiling fan is often mounted on a ceiling cassette type air conditioner or the like.
  • This air conditioner includes a housing whose lower end is opened, and an electric centrifugal blower is attached to the center of the housing.
  • This centrifugal blower is equipped with an impeller, and a heat exchanger is provided around the centrifugal blower.
  • the impeller also has a main plate having a boss provided with a motor rotating shaft mounting hole, a shroud disposed opposite to the main plate, and a plurality of blades provided between the shroud and the main plate. ing.
  • Such centrifugal blowers generally have the problem of high noise levels and low fan efficiency.
  • the blade thickness of all or part of the impeller is formed so as to gradually increase from the shroud toward the main plate, and the mutual blades are mutually connected.
  • an impeller of a centrifugal blower in which the blade interval is gradually narrowed toward the shroud force main plate (Japanese Patent Laid-Open No. 2001-132687).
  • Japanese Patent Laid-Open No. 2001-132687 Japanese Patent Laid-Open No. 2001-132687.
  • the distance between the blades on the main plate side, which is the main flow of air is shortened, the air inflow area is smaller than the shroud side, and the air volume is reduced.
  • the present invention has been made in view of the above-described circumstances, and an object thereof is to provide a centrifugal fan with high fan efficiency.
  • Another object of the present invention is to provide a high-efficiency air conditioner using a centrifugal fan with high fan efficiency.
  • a centrifugal blower includes a main plate having a boss provided with a motor rotation shaft mounting hole, a shroud disposed to face the main plate, and the shroud. It has an impeller comprising a plurality of blades provided between the main plates, the shroud side end on the blade leading edge side is formed in a curved surface, and the curvature radius on the pressure side of the curved end is determined. R, where R is the radius of curvature on the suction side, R ⁇ R
  • an air conditioner according to the present invention is provided with a main plate having a boss provided with a motor rotating shaft mounting hole, a shroud disposed to face the main plate, and between the shroud and the main plate.
  • a centrifugal blower having an impeller composed of a plurality of blades, and a heat exchanger disposed on an outer peripheral portion of the centrifugal blower.
  • the centrifugal blower according to the present invention can provide a centrifugal fan with high fan efficiency.
  • a highly efficient air conditioner using such a high fan efficiency centrifugal blower can be provided.
  • FIG. 1 is a longitudinal sectional view of an air conditioner according to the present invention.
  • FIG. 2 is a plan view of an impeller used in a centrifugal blower according to the present invention.
  • FIG. 3 is a longitudinal sectional view of the impeller along the line ⁇ - ⁇ in FIG.
  • FIG. 4 shows the shroud side end of the leading edge side of the blade used in the centrifugal blower according to the present invention.
  • FIG. 5 is a perspective view of a blade used in the centrifugal blower according to the present invention.
  • FIG. 6 is a conceptual diagram showing an air flow during use of a blade used in a centrifugal blower according to the present invention.
  • FIG. 7 is a result of a static pressure and fan efficiency measurement test using the centrifugal fan according to the present invention.
  • FIG. 8 is a diagram showing a result of a blade thickness ratio and static pressure ratio measurement test using the centrifugal fan according to the present invention.
  • FIG. 9 is a conceptual diagram showing the tip of a blade used in a conventional centrifugal blower.
  • FIG. 10 is a schematic diagram showing an air flow when using a blade used in a centrifugal blower according to the present invention.
  • an air conditioner 1 is, for example, a ceiling cassette type air conditioner, and includes a casing 2 having an open lower end portion.
  • a centrifugal blower 20 comprising a fan motor 3 and an impeller 21 is provided. That is, the fan motor 3 is attached to the center of the upper bottom of the housing 2 via the motor base 4, and the impeller 21 is attached to the rotating shaft of the fan motor 3.
  • a suction bell mouth 5 is provided at the lower portion of the centrifugal blower 20, a drain pan 6 is disposed on the outer peripheral portion of the suction bell mouth 5, and the centrifugal blower 20 is surrounded by the upper portion thereof.
  • the heat exchanger 7 is arranged in the front.
  • the lower open end of the suction bell mouth 5 serves as a suction port for air, and a filter 8 is attached here.
  • the outside of the heat exchanger 7 is an air supply passage 10, and the lower surface portion is an air outlet 11.
  • a frame-shaped front panel 12 is attached to the opening of the casing of the air conditioner.
  • the air conditioner 1 is suspended and fixed to a beam or the like by a mounting bracket 13 or the like.
  • the impeller 21 is provided with a motor rotating shaft mounting hole.
  • a main plate 24 having a boss 22 and a hub 23 provided on the outer periphery of the boss 22, a plurality of blades 25 provided in the circumferential direction of the main plate 24, and a main plate 24 sandwiching the blade 25 Is provided with a shroud 26 arranged opposite to it.
  • the shape of the R portion (curved end portion) of the shroud side end portion on the front edge 25a side of the blade 25 is R
  • the radius of curvature on the pressure surface 25b side is R, negative.
  • the thickness of the blade 25 as a whole is gradually increased from the main plate 24 side cover to the shroud 26 side, so that the main plate side thickness is tl and the shroud side thickness is When t2, the relationship of l ⁇ t2Ztl ⁇ l. 7 is established. In particular, it is preferable that l ⁇ t2Ztl ⁇ l.5.
  • the blade 25 has a space between the blades on the main plate 24 side, which is the main flow of wind, that is, the distance between the suction surface of the blade located in the front and the pressure surface of the blade located in the rear is on the shroud 26 side. It becomes larger than the interval between the blades.
  • the air inflow area on the main plate 24 side becomes larger than the air inflow area on the shroud 26 side, and the inflow resistance on the main plate 24 side, which is the main flow of wind, can be reduced and the air volume can be increased.
  • the inflow area force S on the shroud 26 side which is easy to peel off, is reduced, and peeling on the shroud 26 side can be reduced.
  • the air sucked and sucked through the suction bell mouth 5 is energized by the blade 25, increases the flow velocity, and is blown out of the impeller 21.
  • the shape of the R portion (curved end portion) of the shroud side end portion on the front edge side 25a of the blade 25 is R
  • the radius of curvature on the pressure surface 25b side is R, negative.
  • the static pressure especially in the large air volume (high rotation speed) region increases, the fan efficiency improves, and the fan operation range can be expanded.
  • the thickness of the entire blade 25 is gradually increased from the main plate 24 side cover to the shroud 26 side, and the main plate side wall thickness is tl, and the shroud side wall thickness is When t2, the relation of l ⁇ t2Ztl ⁇ l.7 is established, so that the inflow resistance on the main plate 24 side, which is the main wind, can be reduced and the air volume can be increased. Furthermore, as shown in FIG. 6, the peeling on the suction surface side of the shell 26, which is easily peeled, can be greatly reduced. As a result, the inflow of airflow is smoothed and the static pressure is increased, improving the fan efficiency.
  • the air conditioner of the present invention incorporating the centrifugal fan with high fan efficiency as described above also has high efficiency.
  • Test 1 Using a centrifugal blower (Example 1) having a blade shape as shown in FIG. 4 and a centrifugal blower (conventional example 1) having a blade shape as shown in FIG. The relationship between pressure and air volume, and air volume and efficiency was investigated.
  • Example 1 The results are shown in FIG. In Example 1, the air volume at the same static pressure increased as compared with Conventional Example 1, and it was proved that Example 1 was more efficient than Conventional Example 1 at the same air volume.
  • Test 2 Centrifugal blower (Example 2) in which the thickness of the blade 25 as shown in Fig. 5 was gradually increased from the main plate 24 side to the shroud 26 side and the thickness of the blade 25 was reversed.
  • a centrifugal blower (conventional example 2) that was gradually thickened from the shroud to the 26th main plate 24 side, the relationship between the ratio t2Zt1 of the main plate side wall thickness 1 to the shroud side wall thickness t2 was examined.
  • the centrifugal fan according to the present invention can provide a centrifugal fan with high fan efficiency.
  • a highly efficient air conditioner using such a high fan efficiency centrifugal blower can be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)

Abstract

A centrifugal blower having a bladed wheel with blades arranged between a shroud and a main plate. A shroud-side end section on the front edge side of a blade is formed into a curved surface, and the centrifugal blower satisfies R1 < R2, where R1 is the curvature radius on the positive pressure side of the curved end section, and R2 is the curvature radius on the negative pressure side.

Description

明 細 書  Specification
遠心送風機およびこれを用いた空気調和機  Centrifugal blower and air conditioner using the same
技術分野  Technical field
[0001] 本発明は遠心送風機及び空気調和機に係り、特にブレード前縁'シユラウド側形状 を改良した送風機及びこれを用いた空気調和機に関する。  TECHNICAL FIELD [0001] The present invention relates to a centrifugal blower and an air conditioner, and more particularly, to a blower with an improved blade front edge shape on the shroud side and an air conditioner using the same.
背景技術  Background art
[0002] 一般に天井カセット形の空気調和機等にはターボファンが装着されることが多い。  In general, a ceiling fan is often mounted on a ceiling cassette type air conditioner or the like.
この空気調和機は下端部が開放された筐体を備え、この筐体内には、中央部に電動 遠心送風機が取り付けられる。この遠心送風機は羽根車を備え、さらに、遠心送風機 の周囲には熱交^^が設けられている。  This air conditioner includes a housing whose lower end is opened, and an electric centrifugal blower is attached to the center of the housing. This centrifugal blower is equipped with an impeller, and a heat exchanger is provided around the centrifugal blower.
[0003] 上記羽根車はモータ回転軸取付用孔を設けたボスを有する主板と、この主板と対 向して配置されたシユラウドと、このシュラウドと主板間に設けられた複数のブレードと 力もなつている。このような遠心送風機は、一般に騒音レベルが高ぐファン効率が低 いという問題があった。  [0003] The impeller also has a main plate having a boss provided with a motor rotating shaft mounting hole, a shroud disposed opposite to the main plate, and a plurality of blades provided between the shroud and the main plate. ing. Such centrifugal blowers generally have the problem of high noise levels and low fan efficiency.
[0004] そこで、ブレード長さやブレードピッチ等の配置を改良し、低騒音、高効率化を図つ た遠心送風機が提案されている(特開 2003— 279061号公報)。し力しながら、特開 2003— 279061号公報に記載のものにおいては、図 9及び図 10に示すように、ブレ ード 31はブレード前縁 31a側のシュラウド側端部の R部(曲面状端部)の形状は、正 圧面側の曲率半径 Rと負圧面側の曲率半径 Rは等しく (R =R )、吸込まれた空気  [0004] Therefore, a centrifugal blower has been proposed in which the arrangement of the blade length, the blade pitch, etc. is improved to achieve low noise and high efficiency (Japanese Patent Laid-Open No. 2003-290661). However, in the one described in Japanese Patent Laid-Open No. 2003-290661, as shown in FIGS. 9 and 10, the blade 31 has an R portion (curved surface shape) at the shroud side end on the blade leading edge 31a side. As for the shape of the edge, the radius of curvature R on the pressure surface side and the radius of curvature R on the suction surface side are equal (R = R), and the sucked air
3 4 3 4  3 4 3 4
が負圧面側ブレード先端部 (R部分)で剥離してしまい、負圧面側での剥離が増加  Peels off at the tip of the suction side blade (R part), increasing peeling on the suction side
4  Four
していたため、ファン効率が低くかった。  As a result, fan efficiency was low.
[0005] また、低騒音、高効率化を目的として、羽根車の全部または一部のブレードの肉厚 を、シユラウドから主板に向力うにつれて徐々に厚くなるように形成し、各ブレードの 相互のブレード間隔を、シュラウド力 主板に向力うにつれて徐々に狭くした遠心形 送風機の羽根車が提案されている(特開 2001— 132687号公報)。しかしながら、こ の公報に記載のものは、空気の主流である主板側のブレード相互間の間隔が短くな り、空気の流入面積がシュラウド側より小さくなり風量が低下してしまう。 [0006] 発明の開示 [0005] Further, for the purpose of reducing noise and increasing efficiency, the blade thickness of all or part of the impeller is formed so as to gradually increase from the shroud toward the main plate, and the mutual blades are mutually connected. There has been proposed an impeller of a centrifugal blower in which the blade interval is gradually narrowed toward the shroud force main plate (Japanese Patent Laid-Open No. 2001-132687). However, in this publication, the distance between the blades on the main plate side, which is the main flow of air, is shortened, the air inflow area is smaller than the shroud side, and the air volume is reduced. [0006] Disclosure of the Invention
本発明は上述した事情を考慮してなされたもので、高ファン効率の遠心送風機を 提供することを目的とする。  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a centrifugal fan with high fan efficiency.
[0007] また、高ファン効率の遠心送風機を用いた高効率の空気調和機を提供することを 目的とする。 [0007] Another object of the present invention is to provide a high-efficiency air conditioner using a centrifugal fan with high fan efficiency.
[0008] 上述した目的を達成するため、本発明に係る遠心送風機は、モータ回転軸取付用孔 を設けたボスを有する主板と、この主板と対向して配置されたシユラウドと、このシユラ ウドと前記主板間に設けられた複数のブレードとからなる羽根車を有し、前記ブレー ド前縁側のシュラウド側端部を曲面状に形成するとともに、この曲面状端部の正圧面 側の曲率半径を R、負圧面側の曲率半径を Rとしたとき、 R <Rとしたことを特徴と  [0008] In order to achieve the above-described object, a centrifugal blower according to the present invention includes a main plate having a boss provided with a motor rotation shaft mounting hole, a shroud disposed to face the main plate, and the shroud. It has an impeller comprising a plurality of blades provided between the main plates, the shroud side end on the blade leading edge side is formed in a curved surface, and the curvature radius on the pressure side of the curved end is determined. R, where R is the radius of curvature on the suction side, R <R
1 2 1 2  1 2 1 2
する。  To do.
[0009] また、前記ブレードの肉厚を tとした時、 R <R <tの関係を満たすようにしてもよい  [0009] Further, when the thickness of the blade is t, the relationship of R <R <t may be satisfied.
1 2  1 2
[0010] さらに、上記遠心送風機にお!、て、ブレード全体の肉厚を主板側カもシユラウド側 にかけて徐々に厚くし、主板側肉厚を t、シュラウド側肉厚を tとしたとき、 Kt Zt [0010] Further, in the above centrifugal blower, when the thickness of the entire blade is gradually increased from the main plate side to the shroud side, the main plate side thickness is t, and the shroud side thickness is t, Zt
1 2 2 1 1 2 2 1
≤1. 7を満たすようにしてもよい。 ≤1.7 may be satisfied.
[0011] さらにまた、本発明による空気調和機は、モータ回転軸取付用孔を設けたボスを有 する主板と、この主板と対向して配置されたシユラウドと、このシュラウドと前記主板間 に設けられた複数のブレードとからなる羽根車を有する遠心送風機と、この遠心送風 機の外周部に配置された熱交換器を有することを特徴とする。 Furthermore, an air conditioner according to the present invention is provided with a main plate having a boss provided with a motor rotating shaft mounting hole, a shroud disposed to face the main plate, and between the shroud and the main plate. A centrifugal blower having an impeller composed of a plurality of blades, and a heat exchanger disposed on an outer peripheral portion of the centrifugal blower.
[0012] 本発明に係る遠心送風機によれば、高ファン効率の遠心送風機を提供することが できる。また、このような高ファン効率の遠心送風機を用いた高効率の空気調和機を 提供することができる。 [0012] The centrifugal blower according to the present invention can provide a centrifugal fan with high fan efficiency. In addition, a highly efficient air conditioner using such a high fan efficiency centrifugal blower can be provided.
図面の簡単な説明  Brief Description of Drawings
[0013] [図 1]本発明に係る空気調和機の縦断面図。 FIG. 1 is a longitudinal sectional view of an air conditioner according to the present invention.
[図 2]本発明に係る遠心送風機に用いられる羽根車の平面図。  FIG. 2 is a plan view of an impeller used in a centrifugal blower according to the present invention.
[図 3]図 2の ΠΙ-ΠΙ線に沿う羽根車の縦断面図。  FIG. 3 is a longitudinal sectional view of the impeller along the line ΠΙ-ΠΙ in FIG.
[図 4]本発明に係る遠心送風機に用いられるブレードの前縁側のシュラウド側端部を 示す概念図。 FIG. 4 shows the shroud side end of the leading edge side of the blade used in the centrifugal blower according to the present invention. FIG.
[図 5]本発明に係る遠心送風機に用いられるブレードの斜視図。  FIG. 5 is a perspective view of a blade used in the centrifugal blower according to the present invention.
[図 6]本発明に係る遠心送風機に用いられるブレードの使用時の空気流を示す概念 図。  FIG. 6 is a conceptual diagram showing an air flow during use of a blade used in a centrifugal blower according to the present invention.
[図 7]本発明に係る遠心送風機を用いた静圧、ファン効率測定試験の結果図。  FIG. 7 is a result of a static pressure and fan efficiency measurement test using the centrifugal fan according to the present invention.
[図 8]本発明に係る遠心送風機を用いたブレードの厚さ比と静圧比測定試験の結果 図。  FIG. 8 is a diagram showing a result of a blade thickness ratio and static pressure ratio measurement test using the centrifugal fan according to the present invention.
[図 9]従来の遠心送風機に用いられるブレードの先端部を示す概念図。  FIG. 9 is a conceptual diagram showing the tip of a blade used in a conventional centrifugal blower.
[図 10]本発明に係る遠心送風機に用いられるブレードの使用時の空気流を示す概 念図。  FIG. 10 is a schematic diagram showing an air flow when using a blade used in a centrifugal blower according to the present invention.
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0014] 以下、本発明の一実施形態に係る空気調和機について添付図面を参照して説明 する。 Hereinafter, an air conditioner according to an embodiment of the present invention will be described with reference to the accompanying drawings.
[0015] 尚、以下の記載において、上下、左右等方向を示す用語は添付図面の参照にお いて、または、実際の取り付け状態に基づいて用いられている。  In the following description, terms indicating vertical and horizontal directions are used with reference to the accompanying drawings or based on actual mounting conditions.
[0016] 図 1に示すように、本発明に係る空気調和機 1は、例えば天井カセット形の空気調 和機であり、下端部が開放された筐体 2を備え、この筐体 2内にファンモータ 3と羽根 車 21からなる遠心送風機 20が設けられている。すなわち、この筐体 2の上底の中央 部にファンモータ 3がモータベース 4を介して取り付けられ、このファンモータ 3の回転 軸に羽根車 21が取り付けられている。  As shown in FIG. 1, an air conditioner 1 according to the present invention is, for example, a ceiling cassette type air conditioner, and includes a casing 2 having an open lower end portion. A centrifugal blower 20 comprising a fan motor 3 and an impeller 21 is provided. That is, the fan motor 3 is attached to the center of the upper bottom of the housing 2 via the motor base 4, and the impeller 21 is attached to the rotating shaft of the fan motor 3.
[0017] さらに、この遠心送風機 20の下部には、吸込みベルマウス 5が設けられており、この 吸込みベルマウス 5の外周部にドレンパン 6が配置され、その上部に、遠心送風機 2 0を取り囲むように熱交換器 7が配置されている。吸込みベルマウス 5の下部開放端 は空気の吸込口となり、ここに、フィルタ 8が装着されている。熱交 7の外側は送 風通路 10となり、その下面部が吹出口 11になっている。そして、空気調和機の筐体 の開口部に枠状の前面パネル 12が装着されている。また、空気調和機 1は取付金具 13などにより梁などに吊り下げ固定されている。  Further, a suction bell mouth 5 is provided at the lower portion of the centrifugal blower 20, a drain pan 6 is disposed on the outer peripheral portion of the suction bell mouth 5, and the centrifugal blower 20 is surrounded by the upper portion thereof. The heat exchanger 7 is arranged in the front. The lower open end of the suction bell mouth 5 serves as a suction port for air, and a filter 8 is attached here. The outside of the heat exchanger 7 is an air supply passage 10, and the lower surface portion is an air outlet 11. A frame-shaped front panel 12 is attached to the opening of the casing of the air conditioner. The air conditioner 1 is suspended and fixed to a beam or the like by a mounting bracket 13 or the like.
[0018] 図 2及び図 3に示すように、上記羽根車 21はモータ回転軸取付用孔が設けられた ボス 22と、このボス 22の外周部に設けられたハブ 23とを有する主板 24と、この主板 2 4の円周方向に設けられた複数枚のブレード 25と、このブレード 25を挟んで主板 24 に対向して配置されたシユラウド 26を備えている。 [0018] As shown in Figs. 2 and 3, the impeller 21 is provided with a motor rotating shaft mounting hole. A main plate 24 having a boss 22 and a hub 23 provided on the outer periphery of the boss 22, a plurality of blades 25 provided in the circumferential direction of the main plate 24, and a main plate 24 sandwiching the blade 25 Is provided with a shroud 26 arranged opposite to it.
[0019] 図 3及び図 4に示すように、ブレード 25の前縁 25a側でシュラウド側端部の R部(曲 面状端部)の形状は、正圧面 25b側の曲率半径を R、負圧面 25c側の曲率半径を R 、ブレード 25の肉厚を tとしたとき、ブレード 25の前縁 25a側のシュラウド側端部全域[0019] As shown in Figs. 3 and 4, the shape of the R portion (curved end portion) of the shroud side end portion on the front edge 25a side of the blade 25 is R, and the radius of curvature on the pressure surface 25b side is R, negative. When the radius of curvature on the pressure surface 25c side is R and the wall thickness of the blade 25 is t, the entire edge of the shroud side of the front edge 25a side of the blade 25
2 2
、すなわち、吸込み側全域に渡り R <R <tの関係が成り立つように設定されている  That is, it is set so that the relationship of R <R <t is established over the entire suction side.
1 2  1 2
[0020] このように構成することにより、吸込まれた空気は図 4及び図 6に示すようにブレード 25の負圧面側端部 (R部)での剥離が低減されブレード 25の負圧面 25c側での剥 [0020] With this configuration, the sucked-in air is less separated from the suction surface side end (R portion) of the blade 25 as shown in FIGS. 4 and 6, and the suction surface 25c side of the blade 25 is reduced. Peeling off
2  2
離が抑制され、図 7のように、静圧が増大し、ファン効率が向上した。特に大風量 (高 回転数)域でのファン効率が向上し、ファン運転範囲を拡大することができる。  As shown in Fig. 7, static pressure increased and fan efficiency improved. In particular, fan efficiency is improved in a large air volume (high rotation speed) range, and the fan operating range can be expanded.
[0021] また、図 5に示すように、ブレード 25全体の肉厚は、主板 24側カもシユラウド 26側 にかけて徐々に厚くなつており、主板側の肉厚を tl、シュラウド側の肉厚を t2としたと き、 l < t2Ztl≤l. 7の関係が成り立つように設定されている。特に、 l < t2Ztl≤l . 5にするのが好ましい。これにより、ブレード 25は風の主流となる主板 24側のブレー ド相互間の間隔、すなわち、前方に位置するブレードの負圧面と後方に位置するブ レードの正圧面との間隔がシュラウド 26側のブレード相互間の間隔より大きくなる。そ の結果、主板 24側の空気流入面積がシュラウド 26側の空気流入面積より大きくなり 、風の主流となる主板 24側の流入抵抗が低減して風量を増加させることができる。さ らに、剥離しやすいシュラウド 26側の流入面積力 S小さくなり、シュラウド 26側の剥離を 低減することができる。 In addition, as shown in FIG. 5, the thickness of the blade 25 as a whole is gradually increased from the main plate 24 side cover to the shroud 26 side, so that the main plate side thickness is tl and the shroud side thickness is When t2, the relationship of l <t2Ztl≤l. 7 is established. In particular, it is preferable that l <t2Ztl≤l.5. As a result, the blade 25 has a space between the blades on the main plate 24 side, which is the main flow of wind, that is, the distance between the suction surface of the blade located in the front and the pressure surface of the blade located in the rear is on the shroud 26 side. It becomes larger than the interval between the blades. As a result, the air inflow area on the main plate 24 side becomes larger than the air inflow area on the shroud 26 side, and the inflow resistance on the main plate 24 side, which is the main flow of wind, can be reduced and the air volume can be increased. In addition, the inflow area force S on the shroud 26 side, which is easy to peel off, is reduced, and peeling on the shroud 26 side can be reduced.
[0022] これにより、図 8に示すように、空気流の流入がスムーズになり、静圧が増大してファ ン効率が向上する。  [0022] Thereby, as shown in FIG. 8, the inflow of the air flow becomes smooth, the static pressure is increased, and the fan efficiency is improved.
[0023] 次に本発明に係る空気調和機による空気調和作用と本発明に係る遠心送風機の 送風作用について説明する。  Next, the air conditioning action by the air conditioner according to the present invention and the air blowing action of the centrifugal blower according to the present invention will be described.
[0024] 図 1に示すように、ファンモータ 3に通電すると遠心送風機 20が回転され、室内空 気が矢印 A方向に吸い込まれ、熱交換器 7で熱交換された後、送風通路 10及び吹 出口 11を通して矢印 B方向に吹き出される。これによつて、天井カセット形の空気調 和機による室内の空調が行われる。 As shown in FIG. 1, when the fan motor 3 is energized, the centrifugal blower 20 is rotated, the indoor air is sucked in the direction of arrow A, and heat exchange is performed by the heat exchanger 7. Blows in the direction of arrow B through exit 11. As a result, indoor air conditioning is performed using a ceiling cassette type air conditioner.
[0025] この空調過程にお!、て、吸込みベルマウス 5を介して吸!、込まれた空気は、ブレー ド 25によって付勢され、流速を増して羽根車 21外に送風される。また、この送風過程 において、図 4に示すように、ブレード 25の前縁側 25aでシユラウド側端部の R部(曲 面状端部)の形状は、正圧面 25b側の曲率半径を R、負圧面 25c側の曲率半径を R 、ブレード 25の肉厚を tとしたとき、吸込み側全域に渡り R <Rく tの関係にあるのIn this air conditioning process, the air sucked and sucked through the suction bell mouth 5 is energized by the blade 25, increases the flow velocity, and is blown out of the impeller 21. In addition, in this air blowing process, as shown in FIG. 4, the shape of the R portion (curved end portion) of the shroud side end portion on the front edge side 25a of the blade 25 is R, and the radius of curvature on the pressure surface 25b side is R, negative. When the radius of curvature on the pressure surface 25c side is R and the wall thickness of the blade 25 is t, there is a relationship of R <R t over the entire suction side.
2 1 2 2 1 2
で、特に大風量 (高回転数)域での静圧が増大するとともにファン効率が向上し、ファ ン運転範囲を拡大することができる。  As a result, the static pressure especially in the large air volume (high rotation speed) region increases, the fan efficiency improves, and the fan operation range can be expanded.
[0026] また、図 5に示すように、ブレード 25全体の肉厚は、主板 24側カもシユラウド 26側 にかけて徐々に厚くなつており、主板側の肉厚を tl、シュラウド側の肉厚を t2としたと き、 l<t2Ztl≤l. 7の関係にあるので、風の主流となる主板 24側の流入抵抗が低 減して風量を増加させることができる。さらに、図 6に示すように、剥離しやすいシユラ ウド 26の負圧面側での剥離を大幅に低減できる。これにより、空気流の流入がスムー ズとなり静圧が増大してファン効率が向上する。 In addition, as shown in FIG. 5, the thickness of the entire blade 25 is gradually increased from the main plate 24 side cover to the shroud 26 side, and the main plate side wall thickness is tl, and the shroud side wall thickness is When t2, the relation of l <t2Ztl≤l.7 is established, so that the inflow resistance on the main plate 24 side, which is the main wind, can be reduced and the air volume can be increased. Furthermore, as shown in FIG. 6, the peeling on the suction surface side of the shell 26, which is easily peeled, can be greatly reduced. As a result, the inflow of airflow is smoothed and the static pressure is increased, improving the fan efficiency.
[0027] 従って、上記のような高ファン効率の遠心送風機を^ aみ込んだ本発明の空気調和 機も高効率になる。  [0027] Therefore, the air conditioner of the present invention incorporating the centrifugal fan with high fan efficiency as described above also has high efficiency.
実施例  Example
[0028] 試験 1 : 図 4に示すような形状のブレードを備えた遠心送風機 (実施例 1)と図 9に 示すような形状のブレードを備えた遠心送風機 (従来例 1)を用いて、静圧と風量、風 量と効率の関係を調べた。  [0028] Test 1: Using a centrifugal blower (Example 1) having a blade shape as shown in FIG. 4 and a centrifugal blower (conventional example 1) having a blade shape as shown in FIG. The relationship between pressure and air volume, and air volume and efficiency was investigated.
[0029] 結果を図 7に示す。実施例 1は従来例 1に比べて同一静圧での風量が増し、また、 同一風量では、実施例 1は従来例 1に比べて効率が高いことがわ力つた。  [0029] The results are shown in FIG. In Example 1, the air volume at the same static pressure increased as compared with Conventional Example 1, and it was proved that Example 1 was more efficient than Conventional Example 1 at the same air volume.
[0030] 試験 2 : 図 5に示すようなブレード 25の肉厚を主板 24側からシュラウド 26側にかけ て徐々に厚くした遠心送風機(実施例 2)とこれとは逆にブレード 25の肉厚をシュラウ ドから 26側主板 24側にかけて徐々に厚くした遠心送風機 (従来例 2)を用いて、主板 側の肉厚 1とシユラウド側の肉厚 t2の比 t2Zt 1と静圧比の関係を調べた。  [0030] Test 2: Centrifugal blower (Example 2) in which the thickness of the blade 25 as shown in Fig. 5 was gradually increased from the main plate 24 side to the shroud 26 side and the thickness of the blade 25 was reversed. Using a centrifugal blower (conventional example 2) that was gradually thickened from the shroud to the 26th main plate 24 side, the relationship between the ratio t2Zt1 of the main plate side wall thickness 1 to the shroud side wall thickness t2 was examined.
[0031] 結果を図 8に示す。実施例 2は t2Ztlが 1〜1. 5の範囲では、従来例 2の静圧に対 して、ほぼ 101. 3%に向上し、 1〜1. 7の範囲でも 100%を上回ることがわかった。 本発明に係る遠心送風機によれば、高ファン効率の遠心送風機を提供することが できる。また、このような高ファン効率の遠心送風機を用いた高効率の空気調和機を 提供することができる。 [0031] The results are shown in FIG. In Example 2, when t2Ztl is in the range of 1 to 1.5, the static pressure of Conventional Example 2 is not affected. As a result, it was improved to almost 101.3%, and it was found that the range of 1 to 1.7 exceeded 100%. The centrifugal fan according to the present invention can provide a centrifugal fan with high fan efficiency. In addition, a highly efficient air conditioner using such a high fan efficiency centrifugal blower can be provided.

Claims

請求の範囲 [1] モータ回転軸取付用孔を設けたボスを有する主板と、この主板と対向して配置され たシユラウドと、このシュラウドと前記主板間に設けられた複数のブレードとからなる羽 根車を有し、前記ブレード前縁側のシュラウド側端部を曲面状に形成するとともに、こ の曲面状端部の正圧面側の曲率半径を R Claims [1] A blade comprising a main plate having a boss provided with a motor rotating shaft mounting hole, a shroud disposed opposite to the main plate, and a plurality of blades provided between the shroud and the main plate The shroud end on the blade leading edge side is formed in a curved surface, and the radius of curvature on the pressure surface side of the curved end is set to R.
1、負圧面側の曲率半径を R  1. The radius of curvature on the suction side is R
2としたとき、 R 2 and R
<R <R
1 2としたことを特徴とする遠心送風機。  1 Centrifugal blower characterized by being 2
[2] 前記ブレードの肉厚を tとした時、 R <Rく tの関係にあることを特徴とする請求項 1  [2] The relation of R <R tt is satisfied, where t is the thickness of the blade.
1 2  1 2
記載の遠心送風機。  The centrifugal blower described.
[3] 前記ブレード全体の肉厚を主板側力ゝらシユラウド側にかけて徐々に厚くし、主板側 肉厚を t、シュラウド側肉厚を tとしたとき、 Kt Zt≤1. 7としたことを特徴とする請 [3] When the thickness of the entire blade is gradually increased from the main plate side force to the shroud side, the main plate side thickness is t, and the shroud side thickness is t, Kt Zt≤1.7. Special features
1 2 2 1 1 2 2 1
求項 1に記載の遠心送風機。  The centrifugal fan according to claim 1.
[4] モータ回転軸取付用孔を設けたボスを有する主板と、この主板と対向して配置され たシユラウドと、このシュラウドと前記主板間に設けられた複数のブレードとからなる羽 根車を有する遠心送風機と、この遠心送風機の外周部に配置された熱交換器を有 することを特徴とする空気調和機。 [4] A bladed wheel comprising a main plate having a boss provided with a motor rotating shaft mounting hole, a shroud disposed opposite to the main plate, and a plurality of blades provided between the shroud and the main plate. An air conditioner comprising: a centrifugal blower having a heat exchanger disposed on an outer peripheral portion of the centrifugal blower.
PCT/JP2006/309633 2005-05-26 2006-05-15 Centrifugal blower and air conditioner using the same WO2006126408A1 (en)

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CN101184922A (en) 2008-05-21
KR20080003444A (en) 2008-01-07
JP4693842B2 (en) 2011-06-01
KR100917091B1 (en) 2009-09-15
JPWO2006126408A1 (en) 2008-12-25

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