JP2005307868A - Centrifugal blower - Google Patents

Centrifugal blower Download PDF

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Publication number
JP2005307868A
JP2005307868A JP2004126619A JP2004126619A JP2005307868A JP 2005307868 A JP2005307868 A JP 2005307868A JP 2004126619 A JP2004126619 A JP 2004126619A JP 2004126619 A JP2004126619 A JP 2004126619A JP 2005307868 A JP2005307868 A JP 2005307868A
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Japan
Prior art keywords
impeller
centrifugal blower
shroud
front edge
plate
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Pending
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JP2004126619A
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Japanese (ja)
Inventor
Masahiro Shin
正廣 新
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Priority to JP2004126619A priority Critical patent/JP2005307868A/en
Publication of JP2005307868A publication Critical patent/JP2005307868A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a low noise and high efficient centrifugal blower to reduce a collision stream. <P>SOLUTION: The blower is provided with an impeller 1 comprising a main plate 2, a shroud 3 and a plurality of slats 4, a casing 6 involving the impeller 1, and a suction bellmouth 7 installed in the casing 6. A flat plate 4c, which has the same thickness as the slat 4 and is of a triangle shape, is integrally formed at the front edge 4a of the slats 4, and a side of the flat plate 4c is placed in contact with near the shroud 3 at the front edge 4a of the slats 4. Thereby, the flow on the downstream side of the suction bellmouth 7 is smoothly flowed into the slats 4 to lessen the turbulence in the inflow and obtain the low noise centrifugal blower. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、空気調和機などに用いられる遠心送風機に関するもので、特に遠心送風機の低騒音化に関するものである。   The present invention relates to a centrifugal blower used for an air conditioner and the like, and particularly relates to noise reduction of the centrifugal blower.

従来の遠心送風機について図3を用いて説明する。   A conventional centrifugal blower will be described with reference to FIG.

図において、1は羽根車であり、主板2、シュラウド3および複数の羽根板4より構成されている。羽根板4の前縁部4aと後縁部4bはほぼ平行に形成されている。モータ5は羽根車1に直結したモータであり、羽根車1とモータ5を内包するケーシング6に弾性的に固定されている。7は吸い込みベルマウスであり、ケーシング6に設けた吸い込み口6aにその先端が挿入され、モータ5の取り付け脚5aに対して同心状位置に設けた取り付けねじ穴8と吸い込みベルマウス7の中心に対して前記ねじ穴8と同径の同心円上に設けた穴7aとねじ9で固定されている。   In the figure, reference numeral 1 denotes an impeller, which includes a main plate 2, a shroud 3, and a plurality of blade plates 4. The front edge part 4a and the rear edge part 4b of the blade 4 are formed substantially in parallel. The motor 5 is a motor directly connected to the impeller 1 and is elastically fixed to a casing 6 that encloses the impeller 1 and the motor 5. Reference numeral 7 denotes a suction bell mouth, the tip of which is inserted into a suction port 6 a provided in the casing 6, and the attachment screw hole 8 provided concentrically with the attachment leg 5 a of the motor 5 and the center of the suction bell mouth 7. On the other hand, the screw hole 8 is fixed with a hole 7 a and a screw 9 provided on a concentric circle having the same diameter as the screw hole 8.

上記構成により、モータ5を駆動して羽根車1を回転させると、図4に示すように、空気はほぼ軸方向に吸い込みベルマウス7から吸い込まれ、羽根車1の羽根板4によって昇圧され、径方向に羽根車1から吹き出される(例えば、特許文献1参照)。
実公平6−29519号公報
With the above configuration, when the motor 5 is driven to rotate the impeller 1, as shown in FIG. 4, air is sucked in substantially in the axial direction from the bell mouth 7 and is boosted by the impeller 4 of the impeller 1, It blows off from the impeller 1 in radial direction (for example, refer patent document 1).
No. 6-29519

しかしながら、従来の遠心送風機の構成によると、羽根車1の回転の際、図4で空気の流れと速度を矢印で示すように、羽根板4の高さ方向に生じる速度分布は、シュラウド3側ほど速度が大きく、羽根板4の前縁部4aでの流れの剥離が生じやすくなっている。特にシュラウド3側における吸い込みベルマウス7の下流側の端面付近での流れの乱れと剥離とその乱れた流れがシュラウド3側の羽根板の前縁部4aに吸い込まれ、衝突することから、再び羽根板4の前縁部4aでの流れの乱れが生じ、騒音が発生しやすく、また羽根車の性能損失にもつながるといった課題を有していた。   However, according to the configuration of the conventional centrifugal blower, when the impeller 1 rotates, the velocity distribution generated in the height direction of the vane plate 4 is the shroud 3 side as shown in FIG. As the speed increases, flow separation at the front edge 4a of the blade 4 is likely to occur. In particular, the turbulence and separation of the flow in the vicinity of the downstream end face of the suction bell mouth 7 on the shroud 3 side and the turbulent flow are sucked into and collided with the front edge portion 4a of the blade plate on the shroud 3 side. Disturbance of the flow at the front edge portion 4a of the plate 4 occurs, noise is likely to occur, and there is a problem that it leads to performance loss of the impeller.

本発明はこのような従来の課題を解決するものであり、羽根車の吸い込み流れの乱れを低減し、低騒音かつ効率の良い遠心送風機を提供することを目的とする。   The present invention solves such a conventional problem, and an object of the present invention is to provide a centrifugal fan that reduces disturbance of the suction flow of the impeller and is low in noise and efficient.

上記課題を解決するために、本発明の遠心送風機は、主板とシュラウドと複数の羽根板からなる羽根車と、前記羽根車を内包するケーシングと、前記ケーシングに取り付けられた吸い込みベルマウスとを備え、前記羽根板の前縁部に、厚みが前記羽根板のそれと同一でかつ三角形状の平板を一体に形成し、前記平板の一辺を前記前縁部の前記シュラウド寄りに密着させたもので、吸い込みベルマウス下流側の流れが、羽根板に早くかつスムーズに流入するようになり、流入する空気の流れに乱れが少なくなり、騒音が低く、性能が向上した遠心送風機を提供することができる。   In order to solve the above problems, a centrifugal blower of the present invention includes an impeller including a main plate, a shroud, and a plurality of vanes, a casing containing the impeller, and a suction bell mouth attached to the casing. In the front edge portion of the blade plate, a thickness is the same as that of the blade plate and a triangular plate is integrally formed, and one side of the flat plate is closely attached to the shroud of the front edge portion, The flow downstream of the suction bell mouth can flow into the slats quickly and smoothly, the turbulence of the air flowing in is less turbulent, noise is reduced, and a centrifugal fan with improved performance can be provided.

本発明の遠心送風機は、流入する空気の流れに乱れが少なく、低騒音でかつ性能が良いものである。   The centrifugal blower of the present invention is less disturbed in the flow of air flowing in, has low noise, and has good performance.

第1の発明は、主板とシュラウドと複数の羽根板からなる羽根車と、前記羽根車を内包するケーシングと、前記ケーシングに取り付けられた吸い込みベルマウスとを備え、前記羽根板の前縁部に、厚みが前記羽根板のそれと同一でかつ三角形状の平板を一体に形成し、前記平板の一辺を前記前縁部の前記シュラウド寄りに密着させたもので、吸い込みベルマウス下流側の流れが、羽根板に早くかつスムーズに流入するようになり、流入する空気の流れに乱れが少なくなり、騒音が低く、性能が向上した遠心送風機を提供することができる。   1st invention is equipped with the impeller which consists of a main board, a shroud, and several blades, the casing which contains the said impeller, and the suction bell mouth attached to the said casing, The front edge part of the said blade , The thickness is the same as that of the slats, and a triangular plate is integrally formed, and one side of the plate is closely attached to the shroud of the front edge, and the flow downstream of the suction bell mouth is It is possible to provide a centrifugal blower that quickly and smoothly flows into the slats, less disturbs the flow of air that flows in, has low noise, and has improved performance.

第2の発明は、特に、第1の発明の平板の端面に丸みをもたせたもので、更に吸い込みベルマウスから羽根車に流入する際の流れの乱れ騒音を抑制することが出来る。   The second aspect of the invention is particularly that the end face of the flat plate of the first aspect is rounded, and the turbulence noise of the flow when flowing from the suction bell mouth into the impeller can be suppressed.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(実施の形態1)
図1は、本発明の第1の実施の形態における遠心送風機の断面図である。なお、従来例と同一部分については、同一符号を付してその説明を省略する。
(Embodiment 1)
FIG. 1 is a cross-sectional view of a centrifugal blower according to a first embodiment of the present invention. In addition, about the same part as a prior art example, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

図1において、羽根車1は、主板2、シュラウド3および複数の羽根板4より構成されている。羽根板4のシュラウド3側の前縁部4aには、羽根板4とほぼ同一の厚みを有し三角形の平板4cが羽根板4に沿って羽根車1の中心方向へ突出して一体に設けられ、三角形の一辺は羽根板4の前縁部4aのシュラウド3寄りに密着している。   In FIG. 1, an impeller 1 includes a main plate 2, a shroud 3, and a plurality of blade plates 4. A triangular flat plate 4c having substantially the same thickness as the vane plate 4 is provided on the front edge portion 4a of the vane plate 4 on the shroud 3 side so as to protrude along the vane plate 4 toward the center of the impeller 1. One side of the triangle is in close contact with the shroud 3 of the front edge 4a of the blade 4.

モータ5は羽根車1に直結したモータであり、羽根車1、モータ5を内包するケーシング6に弾性的に固定されている。吸い込みベルマウス7は、ケーシング6に設けた吸い込み口6aに先端を挿入され、モータ5の取り付け脚5aに対して同心状位置に設けた取り付けねじ穴8と吸い込みベルマウス7の中心に対して前記ねじ穴8と同径の同心円上に設けた穴7aとねじ9で固定されている。   The motor 5 is a motor directly connected to the impeller 1, and is elastically fixed to the casing 6 containing the impeller 1 and the motor 5. The suction bell mouth 7 has its tip inserted into a suction port 6 a provided in the casing 6, and is attached to the mounting screw hole 8 provided concentrically with the mounting leg 5 a of the motor 5 and the center of the suction bell mouth 7. It is fixed with a hole 7 a and a screw 9 provided on a concentric circle having the same diameter as the screw hole 8.

次に、上記構成による遠心送風機の動作、作用について図2を用いて説明する。   Next, the operation and action of the centrifugal fan configured as described above will be described with reference to FIG.

基本的な動作は、従来例と同様で、モータ5の駆動により羽根車1は回転し、空気はほぼ軸方向に吸い込みベルマウス7の案内によって吸い込まれ、羽根車1へ流入し、羽根板4によって昇圧され、径方向に羽根車1から吹き出される。   The basic operation is the same as in the conventional example. The impeller 1 is rotated by driving the motor 5, the air is sucked in substantially in the axial direction by the suction of the bell mouth 7, flows into the impeller 1, and the impeller 4 The pressure is increased by the pressure and blown out from the impeller 1 in the radial direction.

その際、まず、吸い込みベルマウス7の下流側端面からの流れは、一旦吸い込みベルマウス7から剥離し、その後シュラウド3の案内によって、羽根車1に導かれる。従来は吸い込みベルマウス7から剥離した流れが羽根板4の前縁部4aに直接衝突していたが、本実施の形態では、羽根板4の前縁部4aに三角形の平板4cがあるため、吸い込みベルマウス7の端面から羽根板4の前縁部4aまでの距離を極力短くすることができ、吸い込みベルマウス7の剥離流れを成長させることなく、羽根車1に流入させることができる。   At this time, first, the flow from the downstream end face of the suction bell mouth 7 is once separated from the suction bell mouth 7 and then guided to the impeller 1 by the guidance of the shroud 3. Conventionally, the flow separated from the suction bell mouth 7 directly collided with the front edge portion 4a of the blade plate 4, but in this embodiment, the front edge portion 4a of the blade plate 4 has a triangular flat plate 4c. The distance from the end face of the suction bell mouth 7 to the front edge 4a of the blade plate 4 can be made as short as possible, and the separation flow of the suction bell mouth 7 can be made to flow into the impeller 1 without growing.

特に吸い込みベルマウス7の下流側端面部からの剥離による流れの乱れを最小限に抑えた流れを早く三角形の平板4cに沿って付着させることができるので、羽根車1への空気の流入の際の剥離による損失や羽根への衝突騒音を下げることが出来る。また、平板4cにより羽根板4の面積が増えるので、羽根車1の翼面積(翼素)を増やすことが出来、羽根車1の総合的な性能を向上させることが出来る。   In particular, since the flow with minimal turbulence caused by separation from the downstream end surface portion of the suction bell mouth 7 can be quickly attached along the triangular flat plate 4c, the air flows into the impeller 1 It is possible to reduce the loss due to peeling and the noise of impingement on the blades. Further, since the area of the blade plate 4 is increased by the flat plate 4c, the blade area (blade element) of the impeller 1 can be increased, and the overall performance of the impeller 1 can be improved.

また、前記三角形の平板4cの端面に丸みをもたせようにすれば、更に吸い込みベルマウス7から羽根車1に流入する際の流れの乱れ騒音を抑制することもできる。   Further, if the end face of the triangular flat plate 4c is rounded, it is possible to further suppress the turbulent noise of the flow when flowing from the suction bell mouth 7 into the impeller 1.

本発明にかかる遠心送風機は、流入する空気の流れに乱れが少ないので、騒音が低く、性能も向上するので、遠心送風機を搭載する空気調和機、送風機、換気装置、燃焼装置、乾燥装置など各種機器に適用できる。   Since the centrifugal blower according to the present invention is less disturbed in the flow of air flowing in, the noise is low and the performance is improved. Applicable to equipment.

本発明の実施の形態1における遠心送風機の断面図Sectional drawing of the centrifugal blower in Embodiment 1 of this invention 同遠心送風機の要部拡大断面図Main section enlarged sectional view of the centrifugal blower 従来の遠心送風機の断面図Cross-sectional view of a conventional centrifugal blower 同遠心送風機の要部拡大断面図Main section enlarged sectional view of the centrifugal blower

符号の説明Explanation of symbols

1 羽根車
2 主板
3 シュラウド
4 羽根板
4a 前縁部
4c 平板
6 ケーシング
7 吸い込みベルマウス
1 impeller 2 main plate 3 shroud 4 impeller 4a front edge 4c flat plate 6 casing 7 suction bell mouth

Claims (2)

主板とシュラウドと複数の羽根板からなる羽根車と、前記羽根車を内包するケーシングと、前記ケーシングに取り付けられた吸い込みベルマウスとを備え、前記羽根板の前縁部に、厚みが前記羽根板のそれと同一でかつ三角形状の平板を一体に形成し、前記平板の一辺を前記前縁部の前記シュラウド寄りに密着させたことを特徴とした遠心送風機。 An impeller comprising a main plate, a shroud, and a plurality of impellers, a casing containing the impeller, and a suction bell mouth attached to the casing, wherein the impeller has a thickness at the front edge thereof. A centrifugal blower characterized in that a triangular flat plate is integrally formed, and one side of the flat plate is brought into close contact with the shroud of the front edge portion. 平板の端面に丸みをもたせたことを特徴とする請求項1記載の遠心送風機。 The centrifugal blower according to claim 1, wherein the end face of the flat plate is rounded.
JP2004126619A 2004-04-22 2004-04-22 Centrifugal blower Pending JP2005307868A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012085836A (en) * 2010-10-20 2012-05-10 Panasonic Corp Washing and drying machine
US10400605B2 (en) 2014-10-30 2019-09-03 Mitsubishi Electric Corporation Turbofan and indoor unit for air conditioning apparatus
WO2021172360A1 (en) * 2020-02-25 2021-09-02 三菱重工業株式会社 Centrifugal compressor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012085836A (en) * 2010-10-20 2012-05-10 Panasonic Corp Washing and drying machine
US10400605B2 (en) 2014-10-30 2019-09-03 Mitsubishi Electric Corporation Turbofan and indoor unit for air conditioning apparatus
WO2021172360A1 (en) * 2020-02-25 2021-09-02 三菱重工業株式会社 Centrifugal compressor

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