JPS5462509A - Blower-noise reducing method by phase control - Google Patents

Blower-noise reducing method by phase control

Info

Publication number
JPS5462509A
JPS5462509A JP12890277A JP12890277A JPS5462509A JP S5462509 A JPS5462509 A JP S5462509A JP 12890277 A JP12890277 A JP 12890277A JP 12890277 A JP12890277 A JP 12890277A JP S5462509 A JPS5462509 A JP S5462509A
Authority
JP
Japan
Prior art keywords
motor
runner
noises
hours
phase control
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.)
Granted
Application number
JP12890277A
Other languages
Japanese (ja)
Other versions
JPS6142120B2 (en
Inventor
Iku Harada
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.)
National Institute of Advanced Industrial Science and Technology AIST
Original Assignee
Agency of Industrial Science and Technology
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 Agency of Industrial Science and Technology filed Critical Agency of Industrial Science and Technology
Priority to JP12890277A priority Critical patent/JPS5462509A/en
Publication of JPS5462509A publication Critical patent/JPS5462509A/en
Publication of JPS6142120B2 publication Critical patent/JPS6142120B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

PURPOSE: To reduce the noises of more than two blowers at the same time by allowing the pressure waves to interfere each other through the phase control of the noise pressure waves of a plural number of blowers.
CONSTITUTION: Two runners 1 and 2 which are revolved by motors Mi and M2 are arranged on the same shaft in a casing 3. When the motor M2 is phase-shifted for the motor Mi by a fixed amount and driven, then noises interfere each other and are offset. Namely, when the distance between runners is l, and the velocity of noise is C, it takes l/C hours for the pressure wave I generated on the runner 1 to reach the position of the runner 2, therefore, in order to generate the pressure wave II which has reverse phase to the pressure wave I' after l/c hours on the runner 2, the revolution of the motor M2 is delayed by the hours At=l/C+T/2 for the motor Mi, then the phases of the pressure waves are made reverse each other on the discharge side, and noises are offset. T means a period.
COPYRIGHT: (C)1979,JPO&Japio
JP12890277A 1977-10-27 1977-10-27 Blower-noise reducing method by phase control Granted JPS5462509A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12890277A JPS5462509A (en) 1977-10-27 1977-10-27 Blower-noise reducing method by phase control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12890277A JPS5462509A (en) 1977-10-27 1977-10-27 Blower-noise reducing method by phase control

Publications (2)

Publication Number Publication Date
JPS5462509A true JPS5462509A (en) 1979-05-19
JPS6142120B2 JPS6142120B2 (en) 1986-09-19

Family

ID=14996173

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12890277A Granted JPS5462509A (en) 1977-10-27 1977-10-27 Blower-noise reducing method by phase control

Country Status (1)

Country Link
JP (1) JPS5462509A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5999097A (en) * 1982-11-26 1984-06-07 Ebara Corp Axial flow type hydraulic machine
JP2007126983A (en) * 2005-11-01 2007-05-24 Toa Corp Drive device of electric fan

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4997601A (en) * 1972-11-24 1974-09-14
JPS5173746A (en) * 1974-12-20 1976-06-25 Matsushita Seiko Kk TONNERUYOHAIKISOCHI
JPS53122908A (en) * 1977-04-04 1978-10-26 Yasurou Nakanishi Rotor blade apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4997601A (en) * 1972-11-24 1974-09-14
JPS5173746A (en) * 1974-12-20 1976-06-25 Matsushita Seiko Kk TONNERUYOHAIKISOCHI
JPS53122908A (en) * 1977-04-04 1978-10-26 Yasurou Nakanishi Rotor blade apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5999097A (en) * 1982-11-26 1984-06-07 Ebara Corp Axial flow type hydraulic machine
JP2007126983A (en) * 2005-11-01 2007-05-24 Toa Corp Drive device of electric fan
JP4711802B2 (en) * 2005-11-01 2011-06-29 ティーオーエー株式会社 Electric fan drive unit

Also Published As

Publication number Publication date
JPS6142120B2 (en) 1986-09-19

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