US20110200426A1 - Noise reduction devices for blowers - Google Patents
Noise reduction devices for blowers Download PDFInfo
- Publication number
- US20110200426A1 US20110200426A1 US13/024,722 US201113024722A US2011200426A1 US 20110200426 A1 US20110200426 A1 US 20110200426A1 US 201113024722 A US201113024722 A US 201113024722A US 2011200426 A1 US2011200426 A1 US 2011200426A1
- Authority
- US
- United States
- Prior art keywords
- noise reduction
- air
- blower
- air outlet
- passage
- 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.)
- Abandoned
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Classifications
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- 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
- F04D29/663—Sound attenuation
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01H—STREET CLEANING; CLEANING OF PERMANENT WAYS; CLEANING BEACHES; DISPERSING OR PREVENTING FOG IN GENERAL CLEANING STREET OR RAILWAY FURNITURE OR TUNNEL WALLS
- E01H1/00—Removing undesirable matter from roads or like surfaces, with or without moistening of the surface
- E01H1/08—Pneumatically dislodging or taking-up undesirable matter or small objects; Drying by heat only or by streams of gas; Cleaning by projecting abrasive particles
- E01H1/0809—Loosening or dislodging by blowing ; Drying by means of gas streams
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- 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
- F04D29/02—Selection of particular materials
-
- 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
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials 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
- 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
- F04D29/4226—Fan casings
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- 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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/626—Mounting or removal of fans
-
- 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
- F04D29/663—Sound attenuation
- F04D29/665—Sound attenuation by means of resonance chambers or interference
Definitions
- the present invention relates to noise reduction devices for blowers that may be used for blowing wind to powder dust or the like generated, for example, at a construction site in order to gather the same or, conversely, for drawing and collecting the powder dust or the like.
- a known blower has a fan disposed within a body housing and rotatably driven by a motor for producing a flow of air into an air inlet portion and out of an air outlet portion of the body housing, so that air is blown out of the air outlet portion, while any dust is drawn into the air inlet portion.
- a noise air blowing sound
- a noise air blowing sound
- Japanese Laid-Open Patent Publication Nos. 2001-50196 and 45-30389 discloses a technique of removing static electricity that may be produced during the use of a blower.
- Japanese Laid-Open Patent Publication No. 45-30389 discloses a technique of reducing a noise. According to this noise reduction technique, a tubular muffler and a specific sound absorbing material each having a plurality of small holes are provided at each of an air inlet portion and an air outlet portion for reducing a noise within a specific frequency range.
- blowers are used as subsidiary devices at construction sites, and therefore, configuring a blower to have the muffler and the specific sound absorbing material as disclosed in Japanese Laid-Open Patent Publication No. 45-30389 leads to a complicated construction of the blower and increase of the manufacturing cost.
- a noise reduction device for a blower includes a noise reduction member.
- the noise reduction member has a noise reduction chamber and a noise reduction opening defined therein, so that a part of air flowing into, through or out of the blower can enter the noise reduction chamber via the noise reduction opening.
- FIG. 1 is a side view of a blower according to a first example with a portion around an air outlet shown in a vertical sectional view;
- FIG. 2 is a plan view of the blower as viewed in a direction of arrow II in FIG. 1 with a portion around the air outlet shown in a horizontal sectional view;
- FIG. 3 is a vertical sectional view taken along line III-III in FIG. 1 and showing a portion around the air outlet in a vertical sectional view.
- FIG. 4 is an enlarged side view of a noise reduction portion of the blower.
- FIG. 5 is a vertical sectional view of a noise reduction adaptor and an air outlet portion of a blower according to a second example.
- a blower in one example, includes a body housing and a rotary fan.
- the body housing has an air inlet portion and an air outlet portion defining an air inlet passage and an air outlet passage, respectively.
- the rotary fan is disposed within the body housing.
- the body housing includes a noise reduction portion having a noise reduction chamber and a noise reduction hole. The noise reduction chamber communicates with one of the air inlet passage and the air outlet passage.
- the primary component of the air blowing sound can be reduced based on the principle of Helmholtz resonator. Because a muffler or a specific sound reduction material as required in the known art for reducing the noise is not necessary, it is possible to achieve effective noise reduction by a simple and low-cost construction.
- the blower of this example can be advantageously used for a blower that is used for performing a relatively light duty and ancillary work for blowing air or collecting dust.
- the noise reduction chamber may be disposed in juxtaposed relationship with the air inlet or outlet passage.
- the noise reduction chamber may communicate with the air outlet passage defined in the air outlet portion via the noise reduction hole.
- the body housing may be split into a left housing half and a right housing half joined together to form the body housing.
- the left housing half and the right housing half are positioned on a left side and a right side with respect to a direction of flow of air within the air inlet or outlet passage.
- the noise reduction portion may be split into a left portion and a right portion corresponding to the left housing half and the right housing half, respectively. With this arrangement, it is possible to easily manufacture the body housing that has the noise reduction portion.
- Each of the left housing half and the right housing half may be molded by resin.
- the left housing half may have a first portion and a first wall integrated with the first portion.
- the right housing half may have a second portion and a second wall integrated with the second portion.
- the air outlet passage of the air outlet portion may be defined between the first portion and the second portion.
- the noise reduction chamber and the noise reduction hole of the noise reduction portion may be defined between the first wall and the second wall.
- a volume of the noise reduction chamber and a diameter of the noise reduction hole may be determined based on the number of fins of the fan and the rotational speed of the fan, so that it is possible to thither effectively achieve reduction of the noise.
- a noise reduction device for a blower.
- the noise reduction device includes a tubular member capable of mounting to one of the air inlet portion and the air outlet portion.
- the tubular member defines therein an air blowing passage, a noise reduction chamber and a noise reduction hole.
- the air blowing passage communicates with the air inlet or outlet passage when the tubular member is mounted to one of the air inlet portion and the air outlet portion.
- the noise reduction chamber communicates with the air blowing passage via the noise reduction hole.
- the noise reduction chamber may be disposed in juxtaposed relationship with the air blowing passage.
- the adaptor constructed in this way, it is possible to achieve the same noise reduction effect as the noise reduction portion formed on the blower.
- the adaptor is simple in construction and can be manufactured at a lower cost.
- the blower 1 has an electric motor 2 that serves as a drive source and is disposed within a body housing 10 .
- the motor 2 is a DC motor that receives a supply of electric power from a battery pack 14 .
- An air outlet portion 11 has a tubular configuration and is integrally formed with the front portion of the body housing 10 .
- An air inlet portion 12 includes an air inlet passage.
- the air inlet passage is a plurality of slit-like air inlet openings fanned in the lower portion of the body housing 10 .
- a loop-shaped handle 13 is disposed at the rear portion of the body housing 10 , and the battery pack 14 serving as a DC power source is mounted to the lower portion of the handle 13 .
- the electric power of the battery pack 14 is supplied to the motor 14 for rotating the same.
- the battery pack 14 has rechargeable batteries and can be removed from the handle 13 .
- a battery charger prepared separately from the battery pack 14 can recharge the batteries, so that the battery pack 14 can be repeatedly used.
- a start switch 13 a and a stop switch 13 b each configured as a push button switch are mounted to the upper portion of the handle 13 . The motor 2 starts when the start switch 13 a is pushed, while the motor 2 stops when the stop switch 13 b is pushed.
- a fan 3 is mounted to an output shaft of the motor 2 .
- a centrifugal fan is used for the fan 3 .
- the fan 3 has nine fins 3 a .
- a fan case 15 is provided at substantially the central portion of the body housing 10 and is configured like a circular disk extending laterally therefrom.
- an external air is drawn into the fan case 15 from the air inlet portion 12 and is then blown in a radial direction along the fins 3 a to collide with the inner surface of the fan case 15 .
- a stream of air circulating in a counterclockwise direction as viewed in FIG. 2 is produced and the streaming air is thereafter blown out of the air outlet portion 11 .
- a noise reduction portion 20 serving as a noise reduction device of the first example is disposed at the air outlet portion 11 .
- the details of the noise reduction portion 20 be described later.
- the body housing 10 is made of resin and has a split-half construction having a left housing half 10 L and a right housing half 10 R molded separately from each other.
- the left and right housing halves 10 L and 10 R are joined together after they are brought to abut to each other.
- the left housing half 10 L and the right housing half 10 R are positioned on the left side and the right side, respectively, with respect to a direction of flow of air indicated by an outline arrow in FIG. 1 .
- FIGS. 2 and 3 show a mating plane 3 where the left and right housing halves 10 L and 10 R abut to each other.
- the left and right housing halves 10 L and 10 R are configured to be symmetrical with each other except for portions forming the fan case 15 .
- Each of the air inlet portion 11 , the air outlet portion 12 , and the handle 13 of the body housing 10 is split into two parts that are formed integrally with the left and right housing halves 10 L and 10 R, respectively.
- the air outlet portion 11 formed integrally with the front portion of the body housing 10 has a substantially cylindrical tubular shape and has a configuration split into a left half and a right half according to the split-half configuration of the housing 10 .
- the noise reduction portion 20 provided at the air outlet portion 11 also has a configuration split into a left half and a right half. Therefore, the air outlet portion 11 and the noise reduction portion 20 are assembled simultaneously with assembling the body housing 10 by bringing the left and right housing halves 10 L and 10 R to abut to each other and joining together.
- An upper wall 16 a and a lower wall 16 b are formed integrally with the air outlet portion 11 .
- An air blowing passage 16 serving as an air outlet passage of the blower 1 is defined between the upper and lower walls 16 a and 16 b .
- An upstream side of the air blowing passage 16 communicates within inside of the fan case 15 .
- the air of the stream produced by the rotation of the fan 3 flows through the air blowing passage 16 and is thereafter blown out of the air outlet portion 11 .
- a nozzle (not shown) may be attached to the air outlet portion 11 , so that air may flow out of an end portion of the nozzle.
- FIG. 4 shows the details of the noise reduction portion 20 .
- the noise reduction portion 20 is disposed on the lower side of the air blowing passage 16 and has a noise reduction chamber 21 and a noise reduction hole 22 .
- the noise reduction chamber 21 is defined by the lower wall 16 b , an arc-shaped bottom wall 21 a formed integrally with a lower portion of the lower wall 16 b , a front wall 21 b and a rear wall 21 c .
- the noise reduction hole 22 is formed in the lower wall 16 b .
- the noise reduction chamber 21 communicates with the air blowing passage 16 via the noise reduction hole 22 .
- the noise reduction chamber 21 is sealed not to communicate with any other spaces, except for the noise reduction hole 22 .
- Each of the upper wall 16 a , the lower wall 16 b , the front wall 21 b , the rear wall 21 c and the noise reduction hole 22 has a configuration split into a left half and a right half corresponding to the split-half configuration of the body housing 10 . Therefore, in order to assemble the upper wall 16 a , the lower wall 16 b , the front wall 21 b , the rear wall 21 c and the noise reduction hale 22 , left and right halves corresponding to these parts and integrally molded with portions of the left and right housing halves 10 L and 10 R forming the air outlet portion 11 are abutted to and joined to each other.
- assembling the body housing 10 by joining the left and right housing halves 10 L and 10 R together leads to simultaneously assemble the noise reduction chamber 21 and the noise reduction hole 22 by joining the corresponding left and right halves together.
- the noise reduction portion 20 can be formed without need of a specific additional operation.
- a variation (pulsation) in pressure depending on the number of fins 3 a of the fan 3 may be produced in the air flowing within the air blowing passage 16 .
- movement (flow) of air between the air blowing passage 16 and the noise reduction chamber 21 occurs in accordance of the principle of a Helmholtz resonator.
- a heat may be produced by a friction between an edge portion of the noise reduction hole 22 and the air flowing along the edge portion. This generation of the frictional heat means that sound energy of the air passing through the air blowing passage 16 is converted into heat energy, so that an air blowing sound is reduced accordingly.
- the volume of the noise reduction chamber 21 and the diameter of the noise reduction hole 22 are suitably set according to the frequency of the air blowing sound, which may vary with the number of fins 3 a of the fan 3 , the rotational speed of the fan 3 , or any other factors. More specifically, in this example, the rotational speed of the fan 3 having the nine fins 3 a is set to 16,000 rpm to produce an air blowing sound having a frequency of about 2.4 kHz.
- the volume of the noise reduction chamber 21 is set to be 14,100 mm 3
- the diameter of the noise reduction hole 22 is set to be 25 mm
- a thickness t of the lower wall 16 b or the depth (length) of the noise reduction hole 22 is set to be 1.5 mm.
- the inventor of the present invention confirmed through experiments that setting the sizes of these parts in this way can provide an excellent noise reduction effect.
- the level of the primary component of the noise produced by the air blown through the air outlet portion 11 was reduced by about 5 to 10 dB than that of the noise produced by air blown through an air outlet of a known blower having no specific sound reduction device. Therefore, no high-pitched and unpleasant noise was generated, and a quality of the sound could be improved. As a result, it is possible to improve the operation performance of the blower 1 .
- the sound reduction portion 20 includes the noise reduction chamber 21 juxtaposed with the air blowing passage 16 and further includes the noise reduction hole 22 communicating between the noise reduction chamber 21 and the air blowing passage 16 . Because the noise reduction chamber 21 and the noise reduction hole 22 are formed by parts that are integral with the body housing 10 and each has a configuration split into a left half and a right half, they can be assembled simultaneously with assembling the body housing 10 .
- the left and right halves forming the noise reduction chamber 21 and the noise reduction hole 22 can be molded together with the corresponding housing halves 10 L and 10 R, for example, by using molds slightly modified from those used for molding the housing halves 10 L and 10 R that do not include the noise reduction chamber 21 and the noise reduction hole 22 . Therefore, the noise reduction portion 20 can be easily and economically manufactured in comparison with a construction using a muffler or a specific noise reduction material.
- the air outlet portion 11 having the noise reduction portion 20 is formed integrally with the body housing 10 having a split-half construction in the first example, the noise reduction portion 20 may be formed separately from the body housing 10 .
- a plurality of noise reduction devices each having a noise reduction member corresponding to the noise reduction portion 20 may be prepared for exchangeably mounting to an air outlet portion or an air inlet portion of a body housing of a blower that does not have the noise reduction portion.
- the noise reduction devices prepared in this way may be configured as adaptors that can be removably mounted to existing blowers having no specific noise reduction devices.
- a noise reduction device prepared as an adopter for mounting to a blower will be hereinafter described as a second example with reference to FIG. 5 .
- the basic construction of the blower 1 of the second example is the same as that of the blower 1 shown in FIGS. 1 to 4 .
- the blower 1 of the second example is different from the blower 1 shown in FIGS. 1 to 4 in that the air outlet portion 17 has no noise reduction portion 20 . Therefore, only the front portion of the air outlet portion 17 is shown in FIG. 5 .
- a noise reduction device 30 according to the second example shown in FIG. 5 can be detachably mounted to the air outlet 17 .
- the noise reduction device 30 has a noise reduction member 35 having a substantially tubular shape and made of resin. Similar to the body housing 10 , the noise reduction member 35 has a split-half construction similar to that of the body housing 10 . An upper wall 31 a and a lower wall 31 b are formed within the noise reduction member 35 and define an air blowing passage 31 therebetween. When the noise reduction device 30 is mounted to the air outlet portion 17 of the blower 1 , the air blowing passage 31 communicates with the air blowing passage 16 of the air outlet portion 17 .
- the noise reduction member 35 has two lower and upper noise reduction portions 32 and 33 .
- the lower noise reduction portion 32 has a noise reduction chamber 32 a disposed along a lower wall 31 b and a noise reduction hole 32 b formed in the lower wall 31 b .
- the upper noise reduction portion 33 has a noise reduction chamber 33 a disposed along an upper wall 31 a and a noise reduction hole 33 b formed in the upper wall 31 a .
- the lower noise reduction chamber 32 a and the upper noise reduction chamber 33 a are sealed from the outside except for the noise reduction hole 32 b and the noise reduction hole 33 b , respectively.
- the diameters of the lower and upper noise reduction holes 32 b and 33 b are suitably determined based on a frequency of the air blowing sound, which may depend on the number of fins 3 a of the fan 3 , the rotational speed of the fan 3 or any other factors.
- the noise reduction device 30 configured in this way, it is possible to achieve substantially the sane advantages as the first example.
- the noise reduction device 30 can be detachably mounted to the air outlet portion 17 , it is possible to provide a sound reduction effect to an existing blower that does not have a specific noise reduction function.
- a noise reduction function can be given to the existing blower by simply mounting the noise reduction device 30 thereto.
- the first and second examples can be further modified.
- the volume of the noise reduction chamber 21 ( 32 a , 33 ) and the diameter of the noise reduction hole 22 ( 32 b , 33 b ) can be suitably determined based on the frequency of the air blowing sound, which may vary with change of the number of fins of the fan, the rotational speed of the fan or any other factors.
- a plurality of noise reduction holes may be provided for one or each noise reduction chamber, and it may be possible to provide a plurality of noise reduction chambers arranged along the direction of flow of the blowing air.
- the blower 1 in the above examples is driven by the motor 2 that receives the supply of electric power from the battery pack 14
- the DC motor 2 may be replaced with an AC motor that receives a supply of an AC power from a commercially available AC power source.
- the blower 1 may be configured as an AC blower.
- the DC motor 2 may be replaced with an internal combustion engine to configure the blower as an engine blower.
- the blower 1 discharges air from the air outlet portion 11 ( 17 ) or the noise reduction adaptor 30 in the above examples, it may be possible to draw air from the air outlet portion 11 ( 17 ) or the noise reduction device 30 for collecting dust or the like by rotating the fan 3 in a reverse direction.
- the noise reduction portion 20 (the noise reduction device 30 ) can be applied to one or both of the air outlet portion and the air inlet portion.
- the noise reduction portion 20 (the noise reduction device 30 ) can be used at any place where the air pressure varies or fluctuates depending on the number of fans or other factors.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Harvester Elements (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010-029802 | 2010-02-15 | ||
JP2010029802A JP5620690B2 (ja) | 2010-02-15 | 2010-02-15 | ブロワ |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110200426A1 true US20110200426A1 (en) | 2011-08-18 |
Family
ID=43759342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/024,722 Abandoned US20110200426A1 (en) | 2010-02-15 | 2011-02-10 | Noise reduction devices for blowers |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110200426A1 (ja) |
EP (1) | EP2360378B1 (ja) |
JP (1) | JP5620690B2 (ja) |
CN (1) | CN102162473A (ja) |
RU (1) | RU2011105456A (ja) |
Cited By (14)
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US20140230181A1 (en) * | 2013-02-20 | 2014-08-21 | Chervon (Hk) Limited | Handheld blower |
US20140299406A1 (en) * | 2013-03-15 | 2014-10-09 | Human Design Medical, Llc | Systems and methods for providing low-noise positive airway pressure |
DE102015015281A1 (de) * | 2014-12-16 | 2017-06-01 | Makita Corporation | Bläsergerät |
CN109196232A (zh) * | 2016-04-21 | 2019-01-11 | 史密斯医疗 Asd 公司 | 空气加温器 |
US10428837B2 (en) | 2012-05-16 | 2019-10-01 | Dyson Technology Limited | Fan |
US10473120B2 (en) | 2017-03-09 | 2019-11-12 | Denso International America, Inc. | Blower assembly having resonators and resonator assembly |
CN112740860A (zh) * | 2019-10-29 | 2021-05-04 | 安德烈·斯蒂尔股份两合公司 | 带有径向鼓风机的手持式加工设备 |
US11117446B2 (en) | 2017-04-11 | 2021-09-14 | Denso Corporation | Blower device |
US11247007B2 (en) * | 2015-10-16 | 2022-02-15 | Metran Co., Ltd. | Silencer and artificial ventilator |
US11434929B2 (en) | 2019-08-02 | 2022-09-06 | Techtronic Cordless Gp | Blowers having noise reduction features |
US11441569B2 (en) | 2019-09-24 | 2022-09-13 | Makita Corporation | Blower |
US11518016B2 (en) * | 2018-03-07 | 2022-12-06 | Husqvarna Ab | Power tool configured to operate in low-noise mode |
US11778960B2 (en) | 2020-01-21 | 2023-10-10 | Techtronic Cordless Gp | Blowers |
US11817073B2 (en) | 2020-01-21 | 2023-11-14 | Techtronic Cordless Gp | Power tool having noise reduction features |
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GB2518935B (en) * | 2012-05-16 | 2016-01-27 | Dyson Technology Ltd | A fan |
CN103103955A (zh) * | 2013-01-31 | 2013-05-15 | 苏州苏农园艺景观有限公司 | 新型园艺吹风机 |
JP2016135229A (ja) * | 2015-01-23 | 2016-07-28 | 日本電産株式会社 | ヘアードライヤー |
WO2016188583A1 (en) * | 2015-05-28 | 2016-12-01 | Husqvarna Ab | Blower with improved sound reduction |
CN108397273B (zh) * | 2017-02-06 | 2022-04-29 | 福特环球技术公司 | 用于发动机冷却系统的冷却风扇 |
SE542268C2 (en) * | 2018-04-27 | 2020-03-31 | Husqvarna Ab | Debris blower |
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- 2011-02-10 US US13/024,722 patent/US20110200426A1/en not_active Abandoned
- 2011-02-14 CN CN2011100413405A patent/CN102162473A/zh active Pending
- 2011-02-14 EP EP11154387.2A patent/EP2360378B1/en active Active
- 2011-02-14 RU RU2011105456/06A patent/RU2011105456A/ru not_active Application Discontinuation
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US10428837B2 (en) | 2012-05-16 | 2019-10-01 | Dyson Technology Limited | Fan |
US10774487B2 (en) | 2013-02-20 | 2020-09-15 | Chervon (Hk) Limited | Handheld blower having engine cooling flow |
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US20140230181A1 (en) * | 2013-02-20 | 2014-08-21 | Chervon (Hk) Limited | Handheld blower |
US9375543B2 (en) * | 2013-03-15 | 2016-06-28 | Human Design Medical, Llc | Systems and methods for providing low-noise positive airway pressure |
US20140299406A1 (en) * | 2013-03-15 | 2014-10-09 | Human Design Medical, Llc | Systems and methods for providing low-noise positive airway pressure |
US11141552B2 (en) | 2013-03-15 | 2021-10-12 | Breas Medical, Inc. | Systems and methods for providing low-noise positive airway pressure |
DE102015015281B4 (de) | 2014-12-16 | 2024-03-07 | Makita Corporation | Bläsergerät |
DE102015015281A1 (de) * | 2014-12-16 | 2017-06-01 | Makita Corporation | Bläsergerät |
DE102015015281B8 (de) | 2014-12-16 | 2024-06-20 | Makita Corporation | Bläsergerät |
US11247007B2 (en) * | 2015-10-16 | 2022-02-15 | Metran Co., Ltd. | Silencer and artificial ventilator |
CN109196232A (zh) * | 2016-04-21 | 2019-01-11 | 史密斯医疗 Asd 公司 | 空气加温器 |
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US11434929B2 (en) | 2019-08-02 | 2022-09-06 | Techtronic Cordless Gp | Blowers having noise reduction features |
US11841023B2 (en) | 2019-08-02 | 2023-12-12 | Techtronic Cordless Gp | Blowers having noise reduction features |
US11441569B2 (en) | 2019-09-24 | 2022-09-13 | Makita Corporation | Blower |
US11434926B2 (en) * | 2019-10-29 | 2022-09-06 | Andreas Stihl Ag & Co. Kg | Hand-guided working apparatus having a radial fan |
EP3815520A1 (de) * | 2019-10-29 | 2021-05-05 | Andreas Stihl AG & Co. KG | Handgeführtes bearbeitungsgerät mit radialgebläse |
CN112740860A (zh) * | 2019-10-29 | 2021-05-04 | 安德烈·斯蒂尔股份两合公司 | 带有径向鼓风机的手持式加工设备 |
US11778960B2 (en) | 2020-01-21 | 2023-10-10 | Techtronic Cordless Gp | Blowers |
US11817073B2 (en) | 2020-01-21 | 2023-11-14 | Techtronic Cordless Gp | Power tool having noise reduction features |
Also Published As
Publication number | Publication date |
---|---|
RU2011105456A (ru) | 2012-08-20 |
JP5620690B2 (ja) | 2014-11-05 |
EP2360378A3 (en) | 2012-09-05 |
EP2360378A2 (en) | 2011-08-24 |
JP2011163300A (ja) | 2011-08-25 |
CN102162473A (zh) | 2011-08-24 |
EP2360378B1 (en) | 2015-06-10 |
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