EP2503159A2 - Axialgebläse - Google Patents

Axialgebläse Download PDF

Info

Publication number
EP2503159A2
EP2503159A2 EP12160575A EP12160575A EP2503159A2 EP 2503159 A2 EP2503159 A2 EP 2503159A2 EP 12160575 A EP12160575 A EP 12160575A EP 12160575 A EP12160575 A EP 12160575A EP 2503159 A2 EP2503159 A2 EP 2503159A2
Authority
EP
European Patent Office
Prior art keywords
casing
axial blower
adapter
axial
fitting part
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.)
Withdrawn
Application number
EP12160575A
Other languages
English (en)
French (fr)
Other versions
EP2503159A3 (de
Inventor
Kazuhiro Nitta
Akira Ueda
Atsushi Yamaguchi
Akihiro Otsuka
Tadashi Katsui
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP2503159A2 publication Critical patent/EP2503159A2/de
Publication of EP2503159A3 publication Critical patent/EP2503159A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • F04D29/68—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
    • 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F04D29/526—Details of the casing section radially opposing blade tips
    • 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

Definitions

  • the embodiment discussed herein is directed to an axial blower.
  • An axial blower is used for cooling electronic equipments in many cases. An amount of heat generated by parts incorporated in an electronic equipment tends to increase, and it is necessary to improve a cooling effect of an axial blower. In order to improve a cooling effect, it is suggested to increase a revolution speed of the axial blower or stacking a plurality of axial blowers in an axial direction to increase a fan pressure or velocity pressure.
  • an axial blower is designed to be operated at a target operating point which is set in accordance with a system impedance of the equipment into which the axial blower is incorporated.
  • the target operating point is an operating condition acquired as an intersection of the system impedance of the equipment into which the axial blower is incorporated and a static pressure-air flow amount characteristic of the axial blower.
  • the actual operating point of the axial blower is shifted from the target operating point.
  • the operation sound of the axial blower is increased.
  • Such a shift of the actual operating point can be adjusted by changing a structure of the axial blower to cause the operating point of the axial blower to match the actual system impedance of the equipment.
  • the target operating point can be shifted by changing the shapes of a moving vane and/or a stationary vane.
  • an axial blower includes: a moving vane generating air flow by rotation; a casing accommodating said moving vane; and an adapter detachably attached to the casing, the adapter including a fitting part to be fit to an inner surface of the casing, the adapter forming a protrusion or a step on the inner surface of the casing.
  • the adaptor is detachably attached to the casing.
  • the blower body for each equipment.
  • a reduction in a noise can be attempted by selecting an adaptor suitable for each equipment, a cost reduction can be made for the equipment.
  • FIG. 1 is a cross-sectional view of an axial blower provided with a turbulence generating step.
  • FIG. 1 a stationary vane 4 and a moving vane 6 are provided in a casing 2 having a cylindrical shape. An air flow is generated in a direction of arrow in FIG 1 by rotation of the moving vane 6.
  • a step (or a protrusion or a bump) is provided in an inner surface 2a of the casing 2, the inner surface 2a being normally an cylindrical inner surface.
  • the step provided on the inner surface 2a causes the air flow in the casing 2 to generate turbulence. Thereby, a static pressure-air flow amount characteristic of the axial blower is changed, which results in a reduction in an operation sound generated by the axial blower.
  • the step or protrusion for generating turbulence can be provided by, for example, molding the casing 2 so that the step or protrusion is formed in the inner surface 2a of the casing 2.
  • the step or protrusion is integrally formed as a part of the casing 2
  • the entire casing 2 must be replaced with a different casing in order to change a shape of the protrusion or a height (level difference) of the step.
  • the inventors considered that such an inconvenience can be omitted by providing the protrusion or step by attaching an adapter on the inner surface 2a of the casing 2 while maintaining the inner surface 2a of the casing 2 to be a cylindrical form.
  • FIG. 2 is a cross-sectional view illustrating a state before incorporating an adapter for providing a step into an axial blower.
  • FIG. 3 is a cross-sectional view of the axial blower after incorporating the adapter.
  • FIG. 4 is a perspective view of the axial blower before incorporating the adapter into the axial blower.
  • the axial blower 10 illustrated in FIG. 2 through FIG. 4 has a structure in which a support part 14 is attached to an inner surface 12a of the casing 12 having a cylindrical shape and an axis of a moving vane 16 is supported on a central part of the support part 14.
  • a support part 14 is attached to an inner surface 12a of the casing 12 having a cylindrical shape and an axis of a moving vane 16 is supported on a central part of the support part 14.
  • an air flow is generated in a direction of arrow indicated in the figures.
  • the adapter 20 is fitted to the inner surface 12a of the casing 12 from the side of the support part 14.
  • the adapter 20 includes a fitting part 20a of a cylindrical shape to be fitted into the inner surface 12a of the casing 12 and a stopper part 20b extending perpendicular to the fitting part 20a on one end side of the fitting part 20a.
  • the stopper 20b has substantially the same shape as a flange part 10a on one end side of the axial blower 10.
  • the stopper 20b has pin holes 20c into which pins 10b are inserted.
  • the fitting part 20a is provided with notch parts 20a for avoiding parts that extend from the casing 12 to fix the support part 14.
  • the stopper part 20b bumps into the flange part 10a of the axial blower 10.
  • the tip of the fitting part 20a is positioned in the vicinity of the moving vane 16, resulting in formation of a turbulence generating step by the tip of the fitting part 20a. Turbulence is generated by the thus-formed step in the vicinity of the moving vane 16.
  • the position of the tip of the fitting part 20a is a position where the stopper part 20b bumps into the flange part 10a of the axial blower 10.
  • the tip of the fitting part 20a can be positioned with high accuracy in the casing 12. That is, by merely inserting the fitting part 20a into the casing 12 until the stopper part 20b bumps into the flange 10a of the axial blower 10, the tip of the fitting part 20a can be positioned with high accuracy, thereby forming the step at an accurate position on the inner surface 12a of the casing 12.
  • the height and shape of the step are not limited to that illustrated in FIGS. 2 and 3 , and may be changed while observing turbulence generated by the step. Because the height of the step corresponds to the thickness of the fitting part 20a of the adapter 20, the height of the step can be adjusted by changing the thickness of the fitting part 20a. Moreover, because the shape of the step corresponds to the shape of the tip of the fitting part 20a, the shape of the step can be changed by making the tip of the fitting part 20a into a slanting surface as illustrated in FIG. 5 or a curved surface as illustrated in FIG. 5B .
  • the adapter 20 illustrated in FIG. 2 and FIG. 3 has a shape, which is insertable into the casing 12 from the side of the axial blower 10 where the support part 14 is formed, the adapter 20 may be made into a shape, which is insertable from the opposite side.
  • FIG. 6 is a cross-sectional view illustrating a state where the adapter 20 is inserted into the casing 12 from the open side of the axial blower 10.
  • the adapter 20A illustrated in FIG. 6 has a shape, which is insertable from the open side (a side through which air flows in). Specifically, the fitting part 20Aa, which is fitted to the inner surface 12a of the casing 12, is shorter than the fitting part 20a of the adapter 20 illustrated in FIGS. 2 and 3 .
  • the length of the fitting portion 20Aa is set shorter than the length of the fitting part 20a by a portion corresponding to the support part so that the tip of the fitting part 20Aa is located at a predetermined position close to the moving vane 16. Moreover, because there is no need to cause the fitting part 20Aa to pass through the support part 14 when inserting the fitting part 20Aa into the casing 12, there is no need to provide notch parts to the fitting part 20Aa and the fitting part 20Aa can be mere a cylindrical shape.
  • FIG. 7A is a plan view of the adapter 20A
  • FIG. 7B is a side view of the adapter 20A. Similar to the adapter 20, the adapter 20A has a stopper part 20Ab. The tip of the fitting part 20Aa is located at a predetermined position, when inserting the fitting part 20Aa into the casing 12, by the stopper part 20Ab being brought into contact with the open side end of the casing 12.
  • FIG. 8A is a plan view of an adapter 20B, which is a variation of the adapter 20 illustrated in FIGS. 2 and 3 .
  • FIG. 8B is a side vie of the adapter 208.
  • a fitting part 20Ba of the adapter 20B has notch parts 20d similar to the adapter 20. However, in addition to the notch parts 20d, the fitting part 20Ba is provided with slits 20Be having the same shape as the notch parts 20d. Accordingly, the fitting part 20Ba of the adapter 20B is formed by a plurality of stripe parts 20Bf extending from the stopper part 20Bb.
  • a turning flow of air may be generated in the vicinity of the inner surface 12a of the casing 12 due to rotation of the moving vane 16.
  • the strip parts 20Bf are formed by the slits 20Be extending in the axial direction as is in the adapter 20B illustrated in FIG. 8B , the turning flow interferes with the strip parts 20Bf, which may be a cause of generation of a noise.
  • slits 20C which are slanted relative to the axial direction, are provided to form slanted strip parts 20Cf in the adapter 20C.
  • the slant angle of the strip parts 20Cf may be determined based on an angle of the spirally turning flow generated by rotation of the moving vane 16 so that interference between the turning flow and the strip parts 20Cf is suppressed, which suppresses generation of a noise due to the turning flow.
  • the adapter may be provided with a finger guard function by providing a finger guard 30 to the above mentioned adapters (for example, the adapter 20A) so that fingers cannot enter the interior of the axial blower.
  • FIG. 11 is a flowchart of a procedure of selecting an adapter to be incorporated into an axial blower.
  • step S1 a characteristic of an axial blower to be incorporated into an equipment is acquired (step S1), and a system impedance of the equipment (a resistance loss with respect to an air flow in the equipment) is acquired (step S2). Then, an operating point, at which the axial blower is operated when the axial blower is incorporated in the equipment, is acquired, and an operation sound (noise) of the axial blower being operated at the acquired operating point is acquired (step S3). Then, it is determined whether the operation sound acquired in the step S3 is equal to or smaller than an allowable value (step S4).
  • step S5 If the operation sound is equal to or smaller than the allowable value, a determination is made that there is no need to improve the operation sound (noise) and the axial blower is made as a completed product without change (step S5). On the other hand, if the operation sound exceeds the allowable value, a determination is made that an improvement in the operating sound (noise) is necessary and the above-mentioned turbulence generating step or protrusion is formed (step S7).
  • various adapters for forming the turbulence generating step or protrusion are prepared beforehand (step S6). After attaching one of the adapters to the axial blower, the axial blower is incorporated into the equipment and an operation sound is checked. If the operation sound (noise) is equal to or smaller than the allowable value, the axial blower in which the adapter has been incorporated is made as a completed product (step S5).
  • adapters having various shapes are prepared beforehand, and an optimum one of the adapters can be found by checking an operation sound while changing the adapters incorporated in the axial blower.
  • the turbulence generating step or protrusion can be formed easily at an accurate position by merely inserting and attaching the adapters to the casing of the axial blower.
  • the adapter can be exchanged easily to the adapter having a different shape, which enables easy selection of an appropriate adapter within a short time.
  • the turbulence generating step or protrusion is formed in a single stage axial blower (a single fan) as an axial blower.
  • the turbulence generating step may be formed in a contra-rotating type axial blower (contra-rotating type fan) having moving vanes arranged in two stages in an axial direction.
  • turbulence may be generated in the vicinity of the moving vane of the second (rear) stage by forming the turbulence generating step or protrusion at a position between the moving vanes that rotates opposite directions to each other in the contra-rotating type axial blower in order to reduce an operation sound of the contra-rotating type axial blower.
  • the contra-rotating type axial blower can be divided between a front stage blower and a rear stage blower.
  • the adapter may be inserted into the rear stage blower having the rear stage moving vane from a side of a support part.
  • the adapter may be inserted into the rear stage blower having the rear stage moving vane from an open side (a side through which air flows out).
  • FIG. 12A indicates values of operating sound measured when four kinds ((b) through (e)) of turbulence generating step are formed in a contra-rotating type axial blower (normal (a)), which is designed to have a target operating point of an air flow amount of 0.45 m 3 /min and a static pressure of 300 Pa, without changing the target operating point.
  • FIG. 12B is a graph illustrating static pressure-air flow amount characteristics of the contra-rotating type axial blower set in the conditions indicated in FIG. 12A .
  • “convex 1 mm” means that a size of the turbulence generating step (difference in height in a radial direction) is 1 mm.
  • the contra-rotating type axial blower provided with a front stage impeller (vane), a rear stage impeller (vane) and a middle stage stationary part so that an operation sound at the target operating point becomes a predetermined sound pressure level, providing the turbulence generating protruding surface (turbulence generating step) may be a cause of increasing an operation sound.
  • the target operating point is not changed as indicated in FIG. 12B .
  • FIG. 13A indicates values of operation sound measured when four kinds ((b1) through (e1)) of turbulence generating step are formed in a contra-rotating type axial blower (normal (a)), which is designed to have a target operating point of an air flow amount of 0.45 m 3 /min and a static pressure of 300 Pa, by changing the target operating point to a target operating point of an air flow amount of 0.4 m 3 /min and a static pressure of 320 Pa (normal (al)).
  • FIG. 13B is a graph illustrating static pressure-air flow amount characteristics of the contra-rotating type axial blower set in the conditions indicated in FIG. 13A .
  • the operation sound when using the axial blower by decreasing the air flow amount, the operation sound, when the turbulence generating step having a difference of 0.2 mm in height in a radial direction is formed, is smaller than the operation sound when the turbulence generating step is not provided (normal (al)). Therefore, it can be found that the operation sound can be reduced by merely providing the turbulence generating protruding surface (turbulence generating step) without changing the shapes and sizes of the front stage impeller (vane), the rear stage impeller (vane) and the middle stage stationary part.
  • the operating sound which may be increased when the target operating point of the axial blower, which has already been designed to be used at a specific target operating point, can be reduced by providing the turbulence generating protruding surface (turbulence generating step).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP12160575.2A 2011-03-22 2012-03-21 Axialgebläse Withdrawn EP2503159A3 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011063107A JP2012197740A (ja) 2011-03-22 2011-03-22 軸流送風機

Publications (2)

Publication Number Publication Date
EP2503159A2 true EP2503159A2 (de) 2012-09-26
EP2503159A3 EP2503159A3 (de) 2014-10-22

Family

ID=45932158

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12160575.2A Withdrawn EP2503159A3 (de) 2011-03-22 2012-03-21 Axialgebläse

Country Status (5)

Country Link
US (1) US20120243985A1 (de)
EP (1) EP2503159A3 (de)
JP (1) JP2012197740A (de)
CN (1) CN102691679A (de)
TW (1) TW201241319A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2876305A1 (de) * 2013-11-25 2015-05-27 ebm-papst Mulfingen GmbH & Co. KG Lüfterbaueinheit
WO2018175359A1 (en) * 2017-03-20 2018-09-27 Shop Vac Corporation Axial fan having housing formed by connectable pieces and including air guide ribs and an internal ramp

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5256184B2 (ja) * 2009-12-14 2013-08-07 国立大学法人 東京大学 二重反転式軸流送風機
CN111980970B (zh) * 2020-08-31 2022-02-11 青岛顺威精密塑料有限公司 一种轴流风扇的出风结构
CN111911438B (zh) * 2020-09-24 2021-11-19 江西艾斯欧匹精密智造科技有限公司 一种便于拆装的高散热风机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4128194B2 (ja) 2005-09-14 2008-07-30 山洋電気株式会社 二重反転式軸流送風機

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173605A (en) * 1963-06-21 1965-03-16 Rotron Mfg Co Fan housing
US3178099A (en) * 1963-10-09 1965-04-13 Lachlan W Child Under-body ventilating fan units
US4353680A (en) * 1979-06-19 1982-10-12 Tokyo Shibaura Denki Kabushiki Kaisha Exhaust fan with removable face cover
US4750860A (en) * 1986-06-30 1988-06-14 Tandem Computers Incorporated Fan
JPS63193792U (de) * 1987-06-02 1988-12-13
JPS63193795U (de) * 1987-06-02 1988-12-13
JPH0432300U (de) * 1990-07-11 1992-03-16
JPH0687695U (ja) * 1993-05-28 1994-12-22 西芝電機株式会社 軸流送風機
JP2635003B2 (ja) * 1993-12-28 1997-07-30 西芝電機株式会社 軸流送風機
JP3491342B2 (ja) * 1994-06-27 2004-01-26 松下電工株式会社 軸流ファン
JP3311526B2 (ja) * 1994-12-02 2002-08-05 株式会社日立製作所 軸流送風機
CN2317434Y (zh) * 1997-12-31 1999-05-05 浙江上风实业股份有限公司 增压通风排风专用风机
US6254343B1 (en) * 1999-12-06 2001-07-03 Motorola, Inc. Low-noise cooling fan for electronic components and method of making the same
JP4441978B2 (ja) * 2000-04-27 2010-03-31 パナソニック株式会社 送風装置
JP2004293389A (ja) * 2003-03-26 2004-10-21 Kyushu Hitachi Maxell Ltd ヘアードライヤ
GB2400141B (en) * 2003-03-31 2005-01-19 Sun Microsystems Inc Fan grill
CN2720170Y (zh) * 2004-08-10 2005-08-24 沈阳鹭岛通风净化设备有限责任公司 新型消声风机
JP2007040110A (ja) * 2005-08-01 2007-02-15 Calsonic Kansei Corp 熱交換器のファンシュラウド構造
US7658592B1 (en) * 2005-12-29 2010-02-09 Minebea Co., Ltd. Slots in fan housing to reduce tonal noise
US20100247344A1 (en) * 2006-12-18 2010-09-30 Sheng-An Yang Heat dissipating fan
CN201013674Y (zh) * 2006-12-29 2008-01-30 上海通用风机股份有限公司 一种装于风机进风口内的消声器
US8087886B2 (en) * 2007-06-13 2012-01-03 Tek-Chain Technology Co., Ltd. Sectional fan frame structure
JP2009127612A (ja) * 2007-11-28 2009-06-11 Nippon Keiki Works Ltd ファンモータのベンチュリー構造
CN201486936U (zh) * 2009-06-10 2010-05-26 佛山市顺德区泛仕达机电有限公司 轴流风机用的进风圈
CN201600635U (zh) * 2009-12-14 2010-10-06 鸿富锦精密工业（深圳）有限公司 挡风装置及具有挡风装置的电子装置
JP5256184B2 (ja) * 2009-12-14 2013-08-07 国立大学法人 東京大学 二重反転式軸流送風機

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4128194B2 (ja) 2005-09-14 2008-07-30 山洋電気株式会社 二重反転式軸流送風機

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2876305A1 (de) * 2013-11-25 2015-05-27 ebm-papst Mulfingen GmbH & Co. KG Lüfterbaueinheit
WO2018175359A1 (en) * 2017-03-20 2018-09-27 Shop Vac Corporation Axial fan having housing formed by connectable pieces and including air guide ribs and an internal ramp
US11359643B2 (en) 2017-03-20 2022-06-14 Shop Vac Corporation Fan having housing formed by connectable pieces and including air guide ribs and an internal ramp

Also Published As

Publication number Publication date
TW201241319A (en) 2012-10-16
CN102691679A (zh) 2012-09-26
JP2012197740A (ja) 2012-10-18
US20120243985A1 (en) 2012-09-27
EP2503159A3 (de) 2014-10-22

Similar Documents

Publication Publication Date Title
EP2503159A2 (de) Axialgebläse
EP3133292B1 (de) Axialgebläse und axialgebläse zur seriellen anwendung
CN102536911B (zh) 空气循环机压缩机扩散器
EP3073276B1 (de) Luftdatensonde mit verbesserter leistung beim betrieb unter einem hohen anstellwinkel
US20140105763A1 (en) Axial-flow fan
EP2175141A1 (de) Propellerlüfter
US8033785B2 (en) Features to properly orient inlet guide vanes
US7762767B2 (en) Axial-flow fan
EP2570677A1 (de) Axialgebläse
EP2781761B1 (de) Zentrifugallüfter und Klimaanlage diesen umfassend
US20160290358A1 (en) Centrifugal fan
CN203548365U (zh) 送风风扇
US20150086348A1 (en) Single suction type centrifugal fan
EP2949944A1 (de) Zentrifugalgebläse
EP2800905B1 (de) Azimuthale ausrichtung von drei teilen eines verdichterspiralgehäuse
CN110067776A (zh) 用于压缩机的扩散器
CN112352107A (zh) 用于降噪的风扇的离心叶轮的布置
US10619506B2 (en) Measuring total pressure of a fluid in a turbo machine
EP3505769B1 (de) Zentrifugalgebläse mit mehreren schaufeln
US11460039B2 (en) Impeller-air intake interface for a centrifugal fan, and centrifugal fan therewith
JP4397832B2 (ja) 軸流送風機
JP5682751B2 (ja) 多翼送風機
JP6531457B2 (ja) プロペラファン
JP3130089U (ja) 遠心送風機
EP3312428A1 (de) Induktor und pumpe

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

RIC1 Information provided on ipc code assigned before grant

Ipc: F04D 29/52 20060101ALI20140917BHEP

Ipc: F04D 25/06 20060101AFI20140917BHEP

Ipc: F04D 29/68 20060101ALI20140917BHEP

17P Request for examination filed

Effective date: 20141126

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20150603