JPS6050298A - Low flow characteristic improviding system for centrifugal fan and compressor - Google Patents

Low flow characteristic improviding system for centrifugal fan and compressor

Info

Publication number
JPS6050298A
JPS6050298A JP58158855A JP15885583A JPS6050298A JP S6050298 A JPS6050298 A JP S6050298A JP 58158855 A JP58158855 A JP 58158855A JP 15885583 A JP15885583 A JP 15885583A JP S6050298 A JPS6050298 A JP S6050298A
Authority
JP
Japan
Prior art keywords
impeller
air
low flow
compressor
centrifugal fan
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.)
Pending
Application number
JP58158855A
Other languages
Japanese (ja)
Inventor
Takeshi Kato
剛 加藤
Hirotoshi Yanagi
浩敏 柳
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.)
Hitachi Zosen Corp
Original Assignee
Hitachi Zosen 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 Hitachi Zosen Corp filed Critical Hitachi Zosen Corp
Priority to JP58158855A priority Critical patent/JPS6050298A/en
Publication of JPS6050298A publication Critical patent/JPS6050298A/en
Pending legal-status Critical Current

Links

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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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
    • F04D29/685—Inducing localised fluid recirculation in the stator-rotor interface

Landscapes

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

Abstract

PURPOSE:To prevent noise of a centrifugal fan under low flow, by providing a path for circulating a portion of air and returning to the upper stream of impeller at the portion of air path innercircumferential face facing with the upper stream end of impeller. CONSTITUTION:An inner tube 6 having innercircumferential face flat with that of an air path 2 is provided in an annular recess 5 formed at the portion of innercircumferential face of air path 2 facing with the upper stream end of impeller 3. The inner tube 6 and the recess 5 are forming a path 7 for returning/ circulating a portion of air to be fed through rotation of the impeller 3 from the impeller 3 to the upper stream. Since the apparent flow will not drop at the inlet of impeller, the low flow characteristic is improved to prevent the low frequency noise.

Description

【発明の詳細な説明】 本発明は遠心送風機及び圧縮機における低流量特性の改
善装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for improving low flow characteristics in centrifugal blowers and compressors.

遠心型の送Ｘ機や圧＃１機において杜、中心部から吸引
した空気を遠心力により外周部から外側へ吹き出して所
定機器に供給している。一般にこのような送風機や圧縮
機では羽根車の回転数を一定にしであるので、所定機器
における送風空気の消ｑ！址が少なくなると、送ａｍや
圧縮機が低流量状自で運転することを強いられ、貴人口
先端でに回（１） 失速が発生し、それに起因した低周波騒音を生じさせる
ことがおる。In a centrifugal type X-blowing machine or pressure #1 machine, the air sucked from the center of the forest is blown out from the outer periphery by centrifugal force, and is supplied to predetermined equipment. Generally, in such blowers and compressors, the number of revolutions of the impeller is kept constant, so it is difficult to eliminate the blown air in a given device. When the flow rate decreases, the transmitter am and the compressor are forced to operate at a low flow rate, which can cause a stall at the tip of the valve, resulting in low-frequency noise.

そこで本発明はかかる問題点を解消した遠心送風機及び
圧縮機における低流−１ｉ特性の改善装置を提供するも
のでろって、その特徴とするところは、空気通路内周面
の羽根車上流端に対向するＷｂ所に、羽根車の回転によ
って送シ出される空気の一部を羽根車より上流側へ戻し
て循環させる循環経路を設けたことにある。かかる構成
によれば、低流量状態で運転することを強いられている
場合でも、羽根車の回転によって送り出される空気の一
部を循環経路を介して再び羽根車に送り込むものである
から、羽根車翼入口部に対する見かけ上の流蓋は減少し
ない。したがって貴人口先端部で発生する旋回失速を防
止することができ、低周波騒音も生じないものである。Therefore, the present invention provides a device for improving the low flow-1i characteristics in centrifugal blowers and compressors that solves such problems. A circulation path is provided at the opposing Wb location to return and circulate a part of the air sent out by the rotation of the impeller to the upstream side of the impeller. According to this configuration, even when the operation is forced to occur in a low flow state, a part of the air sent out by the rotation of the impeller is sent back to the impeller via the circulation path, so the impeller The apparent flow top for the blade inlet is not reduced. Therefore, it is possible to prevent rotational stall from occurring at the tip of the nose, and no low frequency noise is generated.

以下、本発明の一実施例を第１図に基づいて説明する。An embodiment of the present invention will be described below with reference to FIG.

この実施例はオープン羽根車を用いた遠心送風機または
圧縮機に関するもので、（１）は中心（０）から外周部
に向けて空気通路（２）を有するケージ（２） ング、（３）は空気通路（２）内に回転自在に配設され
た羽根車であって、軸部（３Ａ）と翼部（３Ｂ）とを有
する。This example relates to a centrifugal blower or compressor using an open impeller; (1) is a cage (2) having an air passage (2) from the center (0) to the outer periphery; The impeller is rotatably disposed within the air passage (2) and has a shaft portion (3A) and a wing portion (3B).

（４）はディフューザ、（５）は空気通路（２）の内周
面の羽根車（３）の−Ｌ流量に対向する箇所に形成され
た環状四部、（６）は該環状四部（５）内に配設される
と共に内周面が空気通路（２）の内周面と而−状に設定
された内筒であって、との内筒（６）と四部（５）とで
羽根車（３）の回転によって送り出される空気の一部を
羽根車（３）よシ上流側へ戻して循環させる循環経路（
７）を形成しである。（８）は内筒（６）を四部（５）
に固定すると共に空気の流れを整える整流翼であって、
周方自適ゴビ 当間隔、に配設されている。(4) is a diffuser, (5) is an annular four part formed on the inner peripheral surface of the air passage (2) at a location opposite to the -L flow rate of the impeller (3), and (6) is the annular four part (5). an inner cylinder disposed inside the air passageway (2) and whose inner peripheral surface is set in the same shape as the inner peripheral surface of the air passage (2), the inner cylinder (6) and the fourth part (5) forming an impeller. A circulation path (3) that circulates some of the air sent out by the rotation of the impeller (3) back upstream.
7) is formed. (8) is the inner cylinder (6) with four parts (5)
A rectifying blade that fixes the air and adjusts the air flow,
It is arranged at the appropriate interval around the circumference.

上記構成において、羽根車（３）を回転させると、外部
空気が矢印（Ａ）で示すごとく吸引され、その吸引空気
は矢印（Ｂ）で示すごとく外周部へ吹き出され、所定機
器に供給されるものである。ところで低流量状態になっ
ても、羽根車（３）によって送シ出される空気の一部が
矢印ｆｃ）で示すごとく循環通路（７）を通って羽根車
（３）の上流側へ戻されるので、羽根車（３）の実入口
先端部に対する見かけ−Ｆの流量は減少（３） しないものでおる。In the above configuration, when the impeller (3) is rotated, external air is sucked in as shown by the arrow (A), and the sucked air is blown out to the outer periphery as shown by the arrow (B) and is supplied to predetermined equipment. It is something. By the way, even in a low flow state, a part of the air sent out by the impeller (3) is returned to the upstream side of the impeller (3) through the circulation passage (7) as shown by the arrow fc). , the apparent flow rate of -F to the actual inlet tip of the impeller (3) does not decrease (3).

本発明の他の実施例を第２図に基づいて説明する。この
実施例はシュラウド付き羽根車を用いた遠心送風機また
は圧縮機に関するもので、シュラウド（３Ｃ）の上流端
を削除して羽根車（３）から遠心力により外方へ送シ出
された空気の一部を循環経路（７）内に積極的に送９込
めるようにしである。Another embodiment of the present invention will be described based on FIG. This embodiment relates to a centrifugal blower or compressor using an impeller with a shroud, and the upstream end of the shroud (3C) is removed so that the air blown outward from the impeller (3) by centrifugal force is A portion of it is actively sent into the circulation path (7).

以上述べたごとく本発明によれば、低流量状態で運転す
ることを強いられている場合でも、羽根車の回転によっ
て送り出される空気の一部を羽根車に対向するケーシン
グ内周面に設けられた循環経路を介して再び羽根車に送
り込むものであるから、羽根車の具入口先端部に対する
見かけ上の流量は減少しない。したがって広大口先端部
が発生する旋回失速を防止することができ、それに起因
した低周波騒音も生じないものである。As described above, according to the present invention, even when the operation is forced to operate at a low flow rate, a part of the air sent out by the rotation of the impeller can be transferred to the Since the water is sent back to the impeller via the circulation path, the apparent flow rate to the tip of the impeller's inlet port does not decrease. Therefore, it is possible to prevent rotational stall caused by the wide mouth tip, and low frequency noise caused by this can be prevented.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示す要部の縦断面図、第２
図は本発明の他の実施例を示す要部の縦断面図である。 （４） （２）・・・空気通路、（３）・・・羽根車、（７）・
・・循塊経路代理人　森　本　義　弘 （５） 第１図Fig. 1 is a vertical sectional view of the main part showing one embodiment of the present invention, Fig.
The figure is a vertical cross-sectional view of a main part showing another embodiment of the present invention. (4) (2)... Air passage, (3)... Impeller, (7)...
...Circulation route agent Yoshihiro Morimoto (5) Figure 1

Claims (1)

【特許請求の範囲】[Claims] １、　空気通路内周面の羽根車上流端に対向する箇所に
、羽根車の回転によって送シ出される空気の一部を羽根
車より上流側へ戻して循環させる循環経路を設けたこと
を特徴とする遠心送風機及び圧縮機における低流量特性
の改善装置。1. A circulation path is provided at a location on the inner peripheral surface of the air passage facing the upstream end of the impeller to circulate a portion of the air sent out by the rotation of the impeller back to the upstream side of the impeller. A device for improving low flow characteristics in centrifugal blowers and compressors.
JP58158855A 1983-08-29 1983-08-29 Low flow characteristic improviding system for centrifugal fan and compressor Pending JPS6050298A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58158855A JPS6050298A (en) 1983-08-29 1983-08-29 Low flow characteristic improviding system for centrifugal fan and compressor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58158855A JPS6050298A (en) 1983-08-29 1983-08-29 Low flow characteristic improviding system for centrifugal fan and compressor

Publications (1)

Publication Number Publication Date
JPS6050298A true JPS6050298A (en) 1985-03-19

Family

ID=15680875

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58158855A Pending JPS6050298A (en) 1983-08-29 1983-08-29 Low flow characteristic improviding system for centrifugal fan and compressor

Country Status (1)

Country Link
JP (1) JPS6050298A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6437639U (en) * 1987-08-27 1989-03-07
JPH0242199A (en) * 1988-06-29 1990-02-13 Asea Brown Boveri Ag Device for enlarging characteristic of radial compressor
JPH02307719A (en) * 1989-05-23 1990-12-20 Mazda Motor Corp Reaction injection mold
JPH0368599U (en) * 1989-11-07 1991-07-05
JPH06147195A (en) * 1992-10-30 1994-05-27 Ishikawajima Harima Heavy Ind Co Ltd Compressor housing of turbo charger
JPH06331169A (en) * 1993-05-20 1994-11-29 Toupure Kk Air supplying apparatus
JPH11201094A (en) * 1998-01-19 1999-07-27 Ishikawajima Harima Heavy Ind Co Ltd Turbo-compressor
US6514034B2 (en) * 2001-04-05 2003-02-04 Hitachi, Ltd. Pump
JP2003106299A (en) * 2001-09-28 2003-04-09 Mitsubishi Heavy Ind Ltd Fluid machinery
JP2003314496A (en) * 2002-04-18 2003-11-06 Ishikawajima Harima Heavy Ind Co Ltd Centrifugal compressor
JP2012087709A (en) * 2010-10-21 2012-05-10 Ihi Corp Turbocompressor
US8256218B2 (en) * 2007-01-19 2012-09-04 Cummins Turbo Technologies Limited Compressor
JP2017141691A (en) * 2016-02-08 2017-08-17 三菱重工業株式会社 Centrifugal rotary machine
CN107208658A (en) * 2015-02-18 2017-09-26 株式会社Ihi Centrifugal compressor and booster

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5063508A (en) * 1973-10-08 1975-05-30
JPS5971998U (en) * 1982-11-08 1984-05-16 株式会社荏原製作所 centrifugal pump

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5063508A (en) * 1973-10-08 1975-05-30
JPS5971998U (en) * 1982-11-08 1984-05-16 株式会社荏原製作所 centrifugal pump

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6437639U (en) * 1987-08-27 1989-03-07
JPH0242199A (en) * 1988-06-29 1990-02-13 Asea Brown Boveri Ag Device for enlarging characteristic of radial compressor
JPH02307719A (en) * 1989-05-23 1990-12-20 Mazda Motor Corp Reaction injection mold
JPH0368599U (en) * 1989-11-07 1991-07-05
JPH06147195A (en) * 1992-10-30 1994-05-27 Ishikawajima Harima Heavy Ind Co Ltd Compressor housing of turbo charger
JPH06331169A (en) * 1993-05-20 1994-11-29 Toupure Kk Air supplying apparatus
JPH11201094A (en) * 1998-01-19 1999-07-27 Ishikawajima Harima Heavy Ind Co Ltd Turbo-compressor
US6514034B2 (en) * 2001-04-05 2003-02-04 Hitachi, Ltd. Pump
JP2003106299A (en) * 2001-09-28 2003-04-09 Mitsubishi Heavy Ind Ltd Fluid machinery
JP2003314496A (en) * 2002-04-18 2003-11-06 Ishikawajima Harima Heavy Ind Co Ltd Centrifugal compressor
US8256218B2 (en) * 2007-01-19 2012-09-04 Cummins Turbo Technologies Limited Compressor
US8820073B2 (en) 2007-01-19 2014-09-02 Cummins Turbo Technologies Limited Compressor
JP2012087709A (en) * 2010-10-21 2012-05-10 Ihi Corp Turbocompressor
CN107208658A (en) * 2015-02-18 2017-09-26 株式会社Ihi Centrifugal compressor and booster
US10364825B2 (en) 2015-02-18 2019-07-30 Ihi Corporation Centrifugal compressor and turbocharger
JP2017141691A (en) * 2016-02-08 2017-08-17 三菱重工業株式会社 Centrifugal rotary machine

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