JPS59150998A - Air quantity regulating device for centrifugal fan - Google Patents

Air quantity regulating device for centrifugal fan

Info

Publication number
JPS59150998A
JPS59150998A JP58022892A JP2289283A JPS59150998A JP S59150998 A JPS59150998 A JP S59150998A JP 58022892 A JP58022892 A JP 58022892A JP 2289283 A JP2289283 A JP 2289283A JP S59150998 A JPS59150998 A JP S59150998A
Authority
JP
Japan
Prior art keywords
centrifugal fan
air quantity
runner
air volume
guidance device
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
JP58022892A
Other languages
Japanese (ja)
Inventor
Hiroyuki Fukumitsu
福光　弘幸
Nobuo Shimono
展雄 下野
Katsuhiko Igaue
伊賀上　克彦
Shunichi Sato
俊一 佐藤
Akikuni Iwai
岩井　彬訓
Masao Sekiguchi
関口　征男
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.)
Mitsubishi Power Ltd
Original Assignee
Babcock Hitachi KK
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 Babcock Hitachi KK filed Critical Babcock Hitachi KK
Priority to JP58022892A priority Critical patent/JPS59150998A/en
Publication of JPS59150998A publication Critical patent/JPS59150998A/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
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid 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
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0253—Surge control by throttling
    • 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
    • F04D29/40—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
    • F04D29/46—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/462—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps
    • F04D29/464—Fluid-guiding means, e.g. diffusers adjustable especially adapted for elastic fluid pumps adjusting flow cross-section, otherwise than by using adjustable stator blades
    • 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
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet

Landscapes

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

Abstract

PURPOSE:To prevent the generations of noise and vibration by a method wherein a guidance device, providing a runner with pre-rotation, is provided at the entrance of the runner for the centrifual fan so as to be capable of providing the runner with proper pre-rotation in any air quantity zone. CONSTITUTION:The guidance device 9 is provided at the entrance of the runner of the centrifugal fan and the downstream of an air quantity regulating damper 8. The guidance device is consisting of a plurality of guide plates 9a and respective guide plates 9a are fixed in substantially parallel mutually with optimum angle to provide the runner with the pre-rotation. In case the air quantity is reduced by choking the air quantity regulating damper, the guidance device 9 is independent of said damper 8, therefore, the angle of the guidance device 9 may be maintained independently of the opening degree of the damper. Accordingly, the direction of airflow is changed forcibly in the guidance device 9 into a direction in accordance with the angle of the guide plate 9 even if the direction of suction in the air quantity regulating damper 8 is any other direction, and the proper pre-rotation is provided to the runner. As a result, noise and vibration may be prevented in any zone of air quantity.

Description

【発明の詳細な説明】 本発明はボイラ装置等積々の装置に用いられる遠心ファ
ンにおいて、その風量を調整する遠心ファン風量調整装
置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a centrifugal fan air volume adjusting device for adjusting the air volume of a centrifugal fan used in a number of devices such as boiler equipment.

通常、遠心ファンにおいては、その風量を調整するため
に、遠心ファン入口に風量調整ダンパが設けられている
。そして、この風量調整グンパとしては、風量調整とと
もに、遠心ファンの羽根車に予旋回を与えて軸動力の低
下を図り、且つ、サージングを防止するため、平行翼ダ
ンパが使用されている。Generally, in a centrifugal fan, an air volume adjustment damper is provided at the inlet of the centrifugal fan in order to adjust the air volume. As this air volume adjustment gunpa, a parallel blade damper is used in order to adjust the air volume, give pre-swivel to the impeller of the centrifugal fan to reduce shaft power, and prevent surging.

第１図は従来の遠心ファン風量調整装置の概略構成図で
ある。図で、−１は支持台、２は支持台１に支持された
Ｉａｂ受、３は軸受２に軸支された遠心ファン軸、４は
複数個に分割されたケーシング、５はケーシング５の支
持部材、６は入口ダクト、７は出口ダクトである。８は
入口〉リトロにＪ数個並置して設けられた千打翼ダンパ
であり、その翼は回動可能となっており、適宜←させる
ことにより遠心ファンの風量が調整される。FIG. 1 is a schematic diagram of a conventional centrifugal fan air volume adjustment device. In the figure, -1 is a support stand, 2 is an Iab bearing supported on support stand 1, 3 is a centrifugal fan shaft supported on bearing 2, 4 is a casing divided into multiple pieces, and 5 is a support for casing 5. 6 is an inlet duct, and 7 is an outlet duct. Reference numeral 8 denotes several thousand-blade dampers arranged in parallel at the entrance (retro).The blades are rotatable, and the air volume of the centrifugal fan can be adjusted by turning them appropriately.

一般に、遠心ファンの回転方向が矢印Ａで示す方向だと
すると、各風量調整ダンパ８の翼を図示の方向に傾斜さ
せて矢印Ｂで示す方向からの吸込風量を調整するととも
に、サージングを防止し、さらに１吸込み方向を回転方
向と一致させることにより遠心ファンの羽根車に予旋回
を与えて軸動力を低下させ動力損失誉少なくしている。Generally, if the rotational direction of the centrifugal fan is the direction shown by arrow A, the blades of each air volume adjustment damper 8 are tilted in the direction shown to adjust the suction air volume from the direction shown by arrow B, and also prevent surging. 1. By making the suction direction coincide with the rotation direction, a pre-turn is given to the impeller of the centrifugal fan, thereby reducing shaft power and reducing power loss.

ところで、この遠心ファンを低風量域で使用する場合、
各ダンパ８の翼を種々の方向に急角度に絞る必要がある
。そうすると、ダンパ８を通過する吸込方向と遠心ファ
ンの回転方向とが一致せず、予旋回の方向が不適切とな
って、著るしい騒音および振動が発生するという欠点が
あった。By the way, when using this centrifugal fan in a low air volume area,
It is necessary to narrow the blades of each damper 8 to steep angles in various directions. In this case, the direction of suction passing through the damper 8 and the direction of rotation of the centrifugal fan do not match, resulting in an inappropriate direction of pre-swivel, resulting in significant noise and vibration.

本発明の目的は、上記従来の欠点を除き、どのような風
量域においても騒音および振動を防止することができる
遠心ファン風量調整装置を提供するにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a centrifugal fan air volume adjusting device that eliminates the above-mentioned conventional drawbacks and can prevent noise and vibration in any air volume range.

この目的を達成するため、本発明は、遠心７７ンにおけ
る羽根車入口に、この羽根車に予旋回を与える案内装置
を設けたことを特徴とする。To achieve this object, the present invention is characterized in that the inlet of the impeller in the centrifugal 77 engine is provided with a guide device that gives a pre-swivel to the impeller.

以下、本発明を第２図に示す実施例に基づいて説明する
。The present invention will be explained below based on the embodiment shown in FIG.

第２図は本発明の実施例に係る遠心ファン風量調整装置
の概略構成図である。図で、第１図に示す部分と同一部
分には同一符号を付して説明を省略する。９は入口ダク
ト６に設けられた案内装置である。この案内装置９の設
置位置は、遠心ファンの羽根車入口で、且つ、風量調整
ダンパ８の後流部である。FIG. 2 is a schematic diagram of a centrifugal fan air volume adjusting device according to an embodiment of the present invention. In the figure, parts that are the same as those shown in FIG. 9 is a guide device provided in the inlet duct 6. The guide device 9 is installed at the inlet of the impeller of the centrifugal fan and at the downstream side of the air volume adjustment damper 8.

案内装置９は複数の案内板９ａより成り、これら各案内
板９ａはある角度で互いにほぼ平行に配列固定されてい
る。そして、その角度は遠心ファンの羽根車に予旋回を
与えるのに最適な角度に選定されている。The guide device 9 consists of a plurality of guide plates 9a, which are arranged and fixed substantially parallel to each other at a certain angle. The angle is selected to be optimal for giving pre-swing to the impeller of the centrifugal fan.

今、風量調整ダンパ８を図示のように絞り低風量とした
場合、案内装置９は風量調整ダゾノく８とは独立して設
置されているため風量調整ダンツク８の開度とは無関係
にその角度を保持し、したがって、風量調整ダンパ８に
おける吸込の方向がとの−ような方向であっても、案内
装置９においてその方向は強制的に案内板９０角度にし
たがった方向に変更され、羽根車に吸込まれるときは羽
根車に適切な予旋回を与える方向となる。Now, when the air volume adjustment damper 8 is throttled to a low air volume as shown in the figure, the guide device 9 is installed independently of the air volume adjustment damper 8, so its angle is independent of the opening degree of the air volume adjustment damper 8. Therefore, even if the suction direction in the air volume adjustment damper 8 is in the direction shown in -, the direction is forcibly changed in the guide device 9 to the direction according to the angle of the guide plate 90, and the impeller When the impeller is sucked in, the direction is to give the impeller an appropriate pre-turn.

このように、本実施例では、適宜の角度でほぼ平行に配
列固定された複数の案内板より成る案内装置を、風量調
整ダンパ後流部の羽根車入口に設置したの゛で、どのよ
うな風量域においても羽根車に適切な予旋回を与えるこ
とができ、騒音および振動の発生を防止し、又、遠心フ
ァンの動力損失を少なくして効率を向上させることがで
きろうなお、上記実施例の説明では、案内装置における
各案内板を固定されたものとして説明したが、可動とし
て角度調節ができるようにしてもよいのは当然である。In this way, in this example, a guide device consisting of a plurality of guide plates arranged and fixed in approximately parallel at appropriate angles was installed at the impeller inlet downstream of the air volume adjustment damper. It should be noted that it is possible to give an appropriate pre-turn to the impeller even in the air volume range, prevent the generation of noise and vibration, and improve efficiency by reducing the power loss of the centrifugal fan. In the above description, each guide plate in the guide device was explained as being fixed, but it is of course possible to make it movable so that the angle can be adjusted.

又、風量調整ダンパは入口ダクトでなく出口ダクトに設
けても何等の支障をもきたさない。Further, the air volume adjusting damper may be provided in the outlet duct instead of the inlet duct without causing any trouble.

以上述べたように、本発明では、遠心ファンの羽根車入
口に、この羽根車に予旋回を与える案内装置を設けたの
で、どのような風量域においても羽根用に適切な予旋回
を与えることができ、噺音および振動の発生を防止する
ことができる。又、遠心ファンの動力損失を少なくして
効率を向上させることができる。As described above, in the present invention, since a guide device is provided at the inlet of the impeller of the centrifugal fan to give the impeller a pre-turn, it is possible to give the blade an appropriate pre-turn in any air volume range. This makes it possible to prevent noise and vibration from occurring. In addition, efficiency can be improved by reducing power loss of the centrifugal fan.

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

第１図は従来の遠心ファン風量ｉ！Ｉ整装置の概略構成
図、第２図は本発明の実施例に係る遠心ファン風、Ｉｌ
−調整装置の概略構成図である。 ３・・・・・・遠心ファン軸、６・・・・・ご入口ダク
ト、７・・・・・・出口ダクト、８・・・・・・風量調
整ダンパ、９・・・・・・案内装置、９ａ・・・・・・
案内板。Figure 1 shows the conventional centrifugal fan air volume i! FIG. 2 is a schematic configuration diagram of the I adjustment device, and FIG.
- It is a schematic block diagram of an adjustment device. 3... Centrifugal fan shaft, 6... Inlet duct, 7... Outlet duct, 8... Air volume adjustment damper, 9... Guide Device, 9a...
Guide plate.

Claims (1)

【特許請求の範囲】 １、　風Ｊｉｔ　ｉｉＱ整ダンパを備えた遠心ファンに
おいて、この遠心ファンの羽根車入口にこの羽根車に予
旋回を与える案内装置を設けたことを特徴とする遠心フ
ァン風量調整装置。 ２、特許請求の範囲第１項において、前記案内装置は、
適宜角度でほぼ平行に配置された複数の板状部材で構成
されていることを特徴とする遠心ファン風量調整装置。[Claims] 1. Centrifugal fan air volume adjustment in a centrifugal fan equipped with a wind damper, characterized in that a guide device is provided at the inlet of the impeller of the centrifugal fan to give a pre-swing to the impeller. Device. 2. In claim 1, the guide device comprises:
A centrifugal fan air volume adjustment device comprising a plurality of plate-like members arranged substantially parallel at appropriate angles.
JP58022892A 1983-02-16 1983-02-16 Air quantity regulating device for centrifugal fan Pending JPS59150998A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP58022892A JPS59150998A (en) 1983-02-16 1983-02-16 Air quantity regulating device for centrifugal fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58022892A JPS59150998A (en) 1983-02-16 1983-02-16 Air quantity regulating device for centrifugal fan

Publications (1)

Publication Number Publication Date
JPS59150998A true JPS59150998A (en) 1984-08-29

Family

ID=12095306

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58022892A Pending JPS59150998A (en) 1983-02-16 1983-02-16 Air quantity regulating device for centrifugal fan

Country Status (1)

Country Link
JP (1) JPS59150998A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4968907A (en) * 1972-11-08 1974-07-04

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4968907A (en) * 1972-11-08 1974-07-04

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