FR2254233A5 - Noise reduction on axial fan - involves by transferring fraction of flow from upstream of rotor to circumference of blades - Google Patents

Noise reduction on axial fan - involves by transferring fraction of flow from upstream of rotor to circumference of blades

Info

Publication number
FR2254233A5
FR2254233A5 FR7344198A FR7344198A FR2254233A5 FR 2254233 A5 FR2254233 A5 FR 2254233A5 FR 7344198 A FR7344198 A FR 7344198A FR 7344198 A FR7344198 A FR 7344198A FR 2254233 A5 FR2254233 A5 FR 2254233A5
Authority
FR
France
Prior art keywords
blades
flow
circumference
rotor
involves
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.)
Expired
Application number
FR7344198A
Other languages
French (fr)
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.)
Electricite de France SA
Original Assignee
Electricite de France SA
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 Electricite de France SA filed Critical Electricite de France SA
Priority to FR7344198A priority Critical patent/FR2254233A5/en
Priority to DE2458709A priority patent/DE2458709C3/en
Priority to US05/531,714 priority patent/US3951566A/en
Priority to GB5356774A priority patent/GB1454630A/en
Application granted granted Critical
Publication of FR2254233A5 publication Critical patent/FR2254233A5/en
Expired 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
    • F04D29/66—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
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
    • 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
    • F04D27/009—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by bleeding, by passing or recycling fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • F05B2260/962—Preventing, counteracting or reducing vibration or noise by means creating "anti-noise"

Abstract

Method to improve the efficiency of an axial fan ventilator involves extending the stable operating area and reduction of the noise produced by removal of through ports and rejoins the main flow in line with the tops of the fan blades. The supply of the flow medium to the circumference of the fan rotor is made with a pulsing flow at a frequency proportional to both the revolutions of the fan rotor and the number of its blades. Pulsations caused by the blades are thus neutralised.
FR7344198A 1973-12-11 1973-12-11 Noise reduction on axial fan - involves by transferring fraction of flow from upstream of rotor to circumference of blades Expired FR2254233A5 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7344198A FR2254233A5 (en) 1973-12-11 1973-12-11 Noise reduction on axial fan - involves by transferring fraction of flow from upstream of rotor to circumference of blades
DE2458709A DE2458709C3 (en) 1973-12-11 1974-12-11 Axial fan
US05/531,714 US3951566A (en) 1973-12-11 1974-12-11 Axial-flow fan with by-pass pipe or pipes
GB5356774A GB1454630A (en) 1973-12-11 1974-12-11 Axial-flow fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7344198A FR2254233A5 (en) 1973-12-11 1973-12-11 Noise reduction on axial fan - involves by transferring fraction of flow from upstream of rotor to circumference of blades

Publications (1)

Publication Number Publication Date
FR2254233A5 true FR2254233A5 (en) 1975-07-04

Family

ID=9129045

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7344198A Expired FR2254233A5 (en) 1973-12-11 1973-12-11 Noise reduction on axial fan - involves by transferring fraction of flow from upstream of rotor to circumference of blades

Country Status (1)

Country Link
FR (1) FR2254233A5 (en)

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Legal Events

Date Code Title Description
ST Notification of lapse