EP2360378B1 - Blower with noise reduction device - Google Patents

Blower with noise reduction device Download PDF

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Publication number
EP2360378B1
EP2360378B1 EP11154387.2A EP11154387A EP2360378B1 EP 2360378 B1 EP2360378 B1 EP 2360378B1 EP 11154387 A EP11154387 A EP 11154387A EP 2360378 B1 EP2360378 B1 EP 2360378B1
Authority
EP
European Patent Office
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.)
Active
Application number
EP11154387.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2360378A3 (en
EP2360378A2 (en
Inventor
Hideaki Takano
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.)
Makita Corp
Original Assignee
Makita Corp
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 Makita Corp filed Critical Makita Corp
Publication of EP2360378A2 publication Critical patent/EP2360378A2/en
Publication of EP2360378A3 publication Critical patent/EP2360378A3/en
Application granted granted Critical
Publication of EP2360378B1 publication Critical patent/EP2360378B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04D29/663—Sound attenuation
    • 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
    • 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
    • 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.
  • US 4,870,714 A discloses a portable blower/vacuum system.
  • US 6 575 696 B1 discloses a blower with two part housing and integral noise reduction cavity.
  • 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 disclose 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 blower according to claim 1 comprising a noise reduction device including 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.
  • 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 is 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 further effectively achieve reduction of the noise.
  • a noise reduction device for a blower in another example (that does not show all features of the claims), 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 formed 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 mused.
  • a start switch 13a and a stop switch 13b each configured as a push button switch are mounted to the upper portion ef the handle 13. The motor 2 starts when the start switch 13a is pushed, while me motor 2 stops when the stop switch 13b 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 3a.
  • 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 eternal 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 3a 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 10L and a right housing half 10R molded separately from each other.
  • the left and right housing halves 10L and 10R are joined together after they are brought to abut to each other.
  • the left housing half low and the right housing half low 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 J where the left and right housing halves 10L and low abut to each other.
  • the left and right housing halves 10L and 10R 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 10L and low, 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 low and low to abut to each other and joining together.
  • An upper wall 16a and a lower wall 16b 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 16a and 16b.
  • 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 16b, an are-shaped bottom wall 21a formed integrally with a lower portion of the lower wall 16b, a front wall 21b and a rear wall 21c.
  • the noise reduction hole 22 is formed in the lower wall 16b.
  • 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 communicates with any other spaces, except for the noise reduction hole 22.
  • Each of the upper wall 16a, the lower wall 16b, the front wall 21b, the rear wall 21c 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 16a, the lower wall 16b, the front wall 21b, the rear wall 21c and the noise reduction hole 22, left and right halves corresponding to these parts and integrally molded with portions of the left and right housing halves 10 L and low 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 10L and 10R 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 3a of the fan 3 may be produced in the air flowing within the air blowing passage 16. Due to the pressure variation of air, 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. When such movement of air between the air blowing passage 16 and the noise reduction chamber 21 occurs, 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 me air blowing sound, which may vary with the number of fins 3a 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 3a 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, and a thickness t of the lower wall 16b or the depth (length) of the noise reduction hole 22 is set to be 1.5 mm.
  • the inventor of the present invention conformed 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 10L and 10R, for example, by using molds slightly modified from those used for molding the housing halves 10L and 10R 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 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 me 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 31a and a lower wall 31b 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 32a disposed along a lower wall 31b and a noise reduction hole 32b formed in the lower wall 31b.
  • the upper noise reduction portion 33 has a noise reduction chamber 33a disposed along an upper wall 31a and a noise reduction hole 33b formed in the upper wall 31a.
  • the lower noise reduction chamber 32a and the upper noise reduction chamber 33a are sealed from the outside except for the noise reduction hole 32b and the noise reduction hole 33b, respectively.
  • the diameters of the lower and upper noise reduction holes 32b and 33b are suitably determined based on a frequency of the air blowing sound, which may depend on the number of fins 3a of the fan 3, the rotational speed of me fan 3 or any other factors.
  • the noise reduction device 30 configured in this way, it is possible to achieve substantially the same 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 volume of the noise reduction chamber 21 (32a, 33) and the diameter of the noise reduction hole 22 (32b, 33b) 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 Bow 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 art 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)
EP11154387.2A 2010-02-15 2011-02-14 Blower with noise reduction device Active EP2360378B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010029802A JP5620690B2 (ja) 2010-02-15 2010-02-15 ブロワ

Publications (3)

Publication Number Publication Date
EP2360378A2 EP2360378A2 (en) 2011-08-24
EP2360378A3 EP2360378A3 (en) 2012-09-05
EP2360378B1 true EP2360378B1 (en) 2015-06-10

Family

ID=43759342

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11154387.2A Active EP2360378B1 (en) 2010-02-15 2011-02-14 Blower with noise reduction device

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)

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US20110200426A1 (en) 2011-08-18
EP2360378A3 (en) 2012-09-05
JP5620690B2 (ja) 2014-11-05
RU2011105456A (ru) 2012-08-20
CN102162473A (zh) 2011-08-24
EP2360378A2 (en) 2011-08-24
JP2011163300A (ja) 2011-08-25

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