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EP1479917A1 - Lüfter - Google Patents

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Publication number
EP1479917A1
EP1479917A1 EP04012269A EP04012269A EP1479917A1 EP 1479917 A1 EP1479917 A1 EP 1479917A1 EP 04012269 A EP04012269 A EP 04012269A EP 04012269 A EP04012269 A EP 04012269A EP 1479917 A1 EP1479917 A1 EP 1479917A1
Authority
EP
European Patent Office
Prior art keywords
casing
impeller
fan
motor
fan according
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Withdrawn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
EP04012269A
Other languages
English (en)
French (fr)
Inventor
Kazuya Nakagawa
Hidenori Sawada
Hideki Aoi
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.)
Nidec Shibaura Corp
Original Assignee
Nidec Shibaura 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
Priority claimed from JP2003145448A external-priority patent/JP4409859B2/ja
Priority claimed from JP2003270185A external-priority patent/JP2005023897A/ja
Priority claimed from JP2003408319A external-priority patent/JP2005171763A/ja
Application filed by Nidec Shibaura Corp filed Critical Nidec Shibaura Corp
Publication of EP1479917A1 publication Critical patent/EP1479917A1/de
Withdrawn legal-status Critical Current

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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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • 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
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports

Definitions

  • the present invention relates to a fan for supplying fuel gas to a combustion apparatus such as a boiler. More specifically, the present invention relates to an improvement of a casing, an impeller and a motor of a fan for cost reduction, safety and low-noise operation.
  • a fan is used for supplying fuel gas to a combustion apparatus such as a boiler.
  • a combustion apparatus such as a boiler.
  • a centrifugal fan that has an impeller having a plurality of blades and a gas inlet in upper part of the impeller as shown in the Figures of this publication, a motor for rotating the impeller to generate a gas flow from the gas inlet to the outer circumference of the impeller and a casing that encloses the periphery of the impeller.
  • the centrifugal fan has an advantage of a static pressure higher than other type fans such as an axial fan or a laminar flow fan, but has a disadvantage of making noise due to a turbulent flow or a vortex generated in the casing.
  • a DC motor having a mechanical commutator is called as DS brush motor.
  • the DS brush motor usually generates sparks during its rotating. So when using a DC brush motor for supplying fuel gas to a combustion apparatus as a gas flow generating fan , many efforts and much cost may be required in order to avoid the burning risk.
  • a DC motor having a electrical commutation control is called as DC brushless motor. Because of electrical commutation, the DC brushless motor may not generates a spark at its commutation. However if the DS brushless motor is used for supplying fuel gas, it is necessary to insure that no spark is generated when the motor is rotating.
  • a first object of the present invention is to provide a fan that can prevent a gas to be supplied from leaking out of the fan from other than the outlet of the fan.
  • a second object of the present invention is to provide a fan that can suppress a noise caused by the fan rotation with maintaining better static pressure and better flow quantity than before.
  • a third object of the present invention is to provide a fan that can supply fuel gas to a combustion apparatus such as a boiler more safely than before.
  • inlet openings are formed on both ends of a casing in the axial direction of a fan, so that an air pressure inside the casing is always lower than that of the outside.
  • the motor part of the fan may be molded by a resin or the like so that the gas does not leak externally through the inside of the motor.
  • a flow duct cylinder can be provided to the inlet opening of the casing and is extended to an opening of a shroud of the impeller.
  • This flow duct cylinder suppresses generation of a circulation and a turbulent flow of the gas inside the casing so that a noise caused by the circulation and the flow can be reduced.
  • the static pressure and the flow quantity characteristics are also improved.
  • the motor can be a DC brushless motor so that the brush and the commutator can be eliminated.
  • a spark that might be generated between them at commutation does not appear, so there is little risk that the fuel gas catches fire by motor rotation. Accordingly, the fuel gas can be supplied safely.
  • the motor part of the fan is molded by a resin or the like, so as to prevent adhesion of dust or water to a part inside the motor such as an electric contact that may cause a short circuit or a spark other than sparks caused by the commutation. Therefore, the risk that the fuel gas catches fire from the short circuit portion or others can be reduced substantially.
  • Fig. 1 is a cross section and an enlarged view of a main portion indicating a fan according to a first embodiment.
  • the fan 1 includes an impeller 2, a motor 3 and a casing 4.
  • the impeller 2 is positioned in the casing 4, and the motor 3 rotates the impeller 2 relatively to the casing 4.
  • the impeller 2 includes a disk portion 22 and a plurality of blades 21 that are arranged along a circumference of a circle on the disk portion 22.
  • the impeller 2 is attached to a rotation shaft 36 of the motor 3 at the rotation center of the impeller 2.
  • the casing 4 comprises a side wall 40a that faces an outer peripheral end portion 21a of the blade 21 without contact, a first end plate 40b as an upper wall that is positioned at the upper end of the casing 4 and a second end plate 40c as a lower wall that is positioned at the lower end of the casing 4.
  • a circular first aperture 41 serving as an inlet is formed in the first end plate 40b at a center area including the rotational axis of the impeller 2.
  • the diameter of the first Aperture 41 is substantially the same as the one defined by the inner circumferential ends 21b of the blades 21.
  • the second end plate 40c is provided with a second aperture (42), serving in the shown embodiment as an inlet at a periphery of the rotation center axis of the impeller 2.
  • Fig. 5 is a perspective view of the impeller 2 that is divided into two after removing the first end plate 40b.
  • the disc portion 22 is provided with a plurality of small holes, defining passageways having definite section. Thus suction is provided in the vicinity of the second aperture.
  • the passageways may be formed in various ways and are provided in the shown embodiment to be holes with diameters varying with the respective distance to the rotation center axis of the impeller 2.
  • the side wall 40a includes a circular peripheral wall and a linear wall portion that is continuous from the circular peripheral wall in the tangent direction thereof as shown in Figs. 3 and 4.
  • An outlet 43 is provided to the extended end portion of the linear wall portion.
  • the peripheral wall 40a may have an equiangular spiral shape in which a radius of a part of the curved surface in the cylindrical shape of the side wall 40a increases gradually in the rotational direction of the impeller 2.
  • the side wall 40a has the maximum radius portion of the side wall 40a and the minimum radius portion of the side wall 40a, and there is an opening to make the outlet 43 between the maximum radius portion of the side wall 40a and the minimum radius portion of the side wall 40a.
  • Fig. 6 is a cross section of the motor 3.
  • the motor 3 includes a rotor magnet 31, a stator 33 having a plurality of coils 32, a circuit board 34 having a driving circuit for controlling supply of electricity to the coil 32, a motor housing 35, an output shaft 36 and a bearing 37. Note it is better for this bearing 37 to be enclosed by rubber or to be sealed the same.
  • the rubber member 38 reduces communication between the inside of the motor 3 and the inside of the casing 4.
  • This motor 3 is a DC brushless motor, in which the driving circuit controls excitation of the coil 32 instead of a brush and a commutator. Therefore, a spark is not generated in the DC brushless motor though it can be generated between a brush and a commutator when exciting the coil.
  • rotation efficiency of the brushless motor is high because there is little loss of rotation energy due to friction compared with the brush motor that includes a brush and a commutator that contact each other and slide during rotation.
  • a life of the motor 3 can be elongated because there is no abrasion between a brush and a commutator. In addition, there is no sliding noise due to a brush and a commutator, so rotation noise can be reduced.
  • excitation of the coil 32 is controlled by the electric signal in the DC brushless motor, so it is possible to perform a fine control in accordance with the change of torque and rotation speed.
  • An operation of the fan according to this embodiment is as follows. First, the motor 3 and the impeller 2 that is attached to the motor 3 start to rotate relatively to the casing 4. Then, gas at the inner circumferential portion of the impeller blade 21 is led in the outer circumferential direction of the impeller blade 21 by a centrifugal force. Thus, there is a negative pressure to a barometric pressure outside the casing 4 at the vicinity of the inner circumferential portion of the impeller 21 . On the other hand, the gas is compressed at the vicinity of the outer circumferential portion of the impeller 21, where higher pressure is generated than a barometric pressure outside the casing 4.
  • gas outside the casing is led into the casing 4 through the first aperture 41 of the casing 4 that is open to the inner circumferential portion of the impeller blade 21.
  • the gas is discharged externally through the outlet 43 of the casing 4 that is open to the outer circumferential portion of the impeller blade 21.
  • the second aperture 42 of the casing 4 is opposed to the surface of the disk portion 22 of the impeller 2 on which the blades are not arranged.
  • the outlet 43 is open to the outer circumferential portion and is at a pressure substantially the same as the barometric pressure outside. Since a definite passageway is provided in the disc portion 22 gas can be sucked from the area surrounding the second aperture 42.
  • the entire inside of the casing 4 is at a lower pressure than the outer circumferential portion, so the vicinity of the second aperture 42 is at a lower pressure than the barometric pressure outside. Therefore, the gas does not leak externally from the inside of the casing.
  • auxiliary blades 24 can be arranged along a circumference of a circle on the surface of the disk portion 22 of the impeller 2 on which the blade are not arranged as shown in Fig. 2.
  • this auxiliary blade 24 can work as a rib for reinforcing the impeller 2 because it is provided at the inner circumferential side with reference to the blade 21.
  • the fan can be used as a fan for supplying fuel gas to a combustion apparatus such as a boiler in this embodiment.
  • the fuel gas can be fire by a spark. Therefore, it is necessary to prevent the fan from generating a spark or being a cause of fire, and to prevent the fuel gas from leaking externally.
  • stator 33 and the circuit board 34 of this motor are molded 38 by a resin having insulating properties.
  • This mold resin 38 is preferably a synthetic resin, a natural resin, a rubber, a vinyl or a plastic. Since the motor 3 is molded, it will not happen that dust is deposited on the circuit board 34, and a short circuit is formed on the circuit board 34. In addition, it is also possible to prevent an electric connection portion such as a contact between the coil 32 and the circuit board 34 is broken by a vibration of the motor 3 or the device.
  • the impeller 2 is made of a resin that contains a conductive material as conductive filler.
  • the conductive filler may be particles of a metal such as copper, a copper alloy, silver, nickel or a low melting point alloy, metal oxide particles such as zinc oxide, tin oxide or indium oxide, conductive polymer particles such as various types of carbon black, polypyrrole or polyaniline, a polymer particles coated with a metal, particles of copper or silver coated with a rare metal, metal fibers, or carbon fibers. Collision of gas molecules or particles that are contained in the gas always occurs on the surface of the impeller blade 21, so static electricity can be easily accumulated. Therefore, by containing the impeller blade 21 of a conductive material, electrification of the static electricity can be prevented.
  • the casing 4 is made of aluminum by die casting.
  • Aluminum has a good conductivity of electricity and is also improved in its mechanical strength by the die casting process. Therefore, the casing 4 is always conductive so that electrification of the static electricity can be prevented, sufficient strength is obtained by die casting, and fine machining of the casing 4 can be performed.
  • the casing 4 can be made of a resin by molding so as to produce it at a low cost. Furthermore, if it is formed integrally with the mold resin 38 of the motor 3, leakage of gas through the inside of the motor 3 externally can be prevented stably.
  • Fig. 7 is a cross section showing a fan according to the second embodiment.
  • the fan 101 includes an impeller 102, a motor 103 and a casing 104.
  • the impeller 102 is positioned in the casing 104, and the motor 103 rotates the impeller 102 relatively to the casing 104.
  • the impeller 102 includes a disk portion 122 and a plurality of blades 121 arranged along a circumference of a circle on the surface of the disk portion 122.
  • the impeller 102 is attached to a rotation shaft 136 of the motor 103 at the rotation center portion.
  • a disk-like shroud 123 having a circular hole 123a at the center thereof is provided at the upper end portion of the blade 121.
  • an outer rim end 123b of the shroud 123 is extended longer than the outer circumferential end 121b of the blade 121 to the outer circumference.
  • a gas flow from the outer rim end 123b to the circular hole 123a may be decreased, because an opening between the outer rim end 123b and an inner side wall of the casing 104 is made be narrower. Therefore a noise due to a back flow, a turbulent flow or the vortex flow of the gas can be suppressed in the upper area of the shroud 123.
  • the casing 104 comprises a side wall 140a that is opposed to the outer peripheral end portion 121 a of the blade 121 without contact, a first end plate 140b as an upper wall that is positioned at the upper side of the casing 104, a second end plate 140c as an lower wall that is positioned at the lower side of the casing 104 and a cylinder-like wind tunnel 145.
  • a circular first aperture 141 is formed in the first end plate 140b at a center area including the rotational axis of the impeller 2.
  • a motor 103 is attached on the lower wall 140c of the casing.
  • the side wall 140a has an equiangular spiral shape in which a radius of a part of the curved surface in the cylindrical shape of the side wall 140a increases gradually in the rotation direction of the impeller 102, having the same shape as the side wall 40a shown in Fig. 3.
  • the side wall 140a has the maximum radius portion of the side wall 140a and the minimum radius portion of the side wall 140a, and there is an opening to make the outlet 143 between the maximum radius portion of the side wall 140a and the minimum radius portion of the side wall 140a.
  • the wind tunnel 145 is provided so that the upper end thereof is attached closely on the lower side of the upper wall 140b at the position where the circular opening of the wind tunnel 145 is aligned with the first inlet hole 141, and the lower end of the wind tunnel 145 is extending to the same position or below the upper end of the center hole 123a of the shroud 123.
  • the motor 103 has the same structure as the motor 3 described in the first embodiment.
  • An operation of the fan in the second embodiment is as follows. First, the motor 103 and the impeller 102 that is attached to the motor 103 start to rotate relatively to the casing 104. Then, the gas at the inner circumferential portion of the impeller blade 121 is led in the outer circumferential direction of the impeller blade 121 by its rotation. And a negative pressure comparing with a barometric pressure outside the casing 104 is generated at the vicinity of the inner circumferential portion of the impeller 102. On the other hand, the gas is compressed at the vicinity of the outer circumferential portion of the impeller 121, where higher pressure is generated than a barometric pressure outside the casing 104.
  • the gas outside the casing 104 is led into the casing 104 through the first aperture 141 of the casing 104 that is open to the inner circumferential portion of the impeller 102 through the wind tunnel 145.
  • the wind tunnel 145 is open at the circular hole 123a of the shroud 123.
  • an external air can be led into the casing 104 efficiently and can be discharged smoothly from the portion.
  • the lower end of the wind tunnel 145 is extending to below the top end of the center hole 123a of the shroud 123.
  • a cylindrical gap between the outer circumferential surface of the wind tunnel 145 and the inner circumferential portion 123a of the shroud 123 is formed.
  • An outer circumferential end 123b of the shroud 123 is extended longer than the outer circumferential end 121a of the blade 121 to the outer circumference. Therefore, the gas is prevented from flowing into the upper portion of the shroud 123 to form a circulating flow. Thus, the gas that is led into the outer circumferential portion of the impeller blade 121 is discharged to the outside of the casing 104 through the outlet 143 of the casing 104 that is open to the outer circumferential portion of the impeller blade 121.
  • first and the second embodiments described above are just examples of various embodiments of the present invention, and they can be modified or corrected in the scope of the present invention.
  • a space may be provided at the inner circumferential portion of the impeller for housing the motor so as to realize a compact size.
  • a material of the impeller or the casing, a shape and a position of the first and/or second aperture or the outlet, a shape of the impeller blade, and others can be determined freely.
  • it is determined freely whether or not there is the shroud or the wind tunnel that is continuous to the first aperture in the first embodiment, or a structure of the motor and whether or not there is the second aperture in the second embodiment.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP04012269A 2003-05-22 2004-05-24 Lüfter Withdrawn EP1479917A1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2003145448 2003-05-22
JP2003145448A JP4409859B2 (ja) 2003-05-22 2003-05-22 ボイラー用送風機
JP2003270185A JP2005023897A (ja) 2003-07-01 2003-07-01 送風機
JP2003270185 2003-07-01
JP2003408319A JP2005171763A (ja) 2003-12-05 2003-12-05 送風機
JP2003408319 2003-12-05

Publications (1)

Publication Number Publication Date
EP1479917A1 true EP1479917A1 (de) 2004-11-24

Family

ID=33101977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04012269A Withdrawn EP1479917A1 (de) 2003-05-22 2004-05-24 Lüfter

Country Status (1)

Country Link
EP (1) EP1479917A1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102042652A (zh) * 2009-10-26 2011-05-04 广东松下环境系统有限公司 多室吸入换气产品
CN105370624A (zh) * 2015-11-30 2016-03-02 广东美的制冷设备有限公司 离心风机及移动式空调器
US9885367B2 (en) 2012-07-05 2018-02-06 Minebea Co., Ltd. Centrifugal fan
US9933185B2 (en) 2014-02-24 2018-04-03 Noritz Corporation Fan and water heater provided with the same, and impeller and water heater provided with the same
US10072842B2 (en) 2014-02-21 2018-09-11 Noritz Corporation Water heater
CN110905850A (zh) * 2019-10-28 2020-03-24 天津怡和嘉业医疗科技有限公司 用于通气治疗设备的叶轮、风机以及通气治疗设备
EP4242465A1 (de) * 2022-03-07 2023-09-13 GrowTrend Biomedical Co., Ltd. Gebläse

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3730642A (en) * 1971-10-14 1973-05-01 Vernco Corp Cooling means for motor of a wet pick-up vacuum sweeper
EP1122444A2 (de) * 2000-02-01 2001-08-08 ebm Werke GmbH & Co. KG Radialventilator und Düse für einen Radialventilator
US6328529B1 (en) * 1998-04-28 2001-12-11 Denso Corporation Cooling device with support members facing fin
US20020057965A1 (en) * 2000-11-16 2002-05-16 Delta Electronics Inc. Centrifugal fan
US20020057022A1 (en) * 1999-03-31 2002-05-16 Katsuhiko Yamamoto Fan motor
US20020146318A1 (en) * 2001-03-30 2002-10-10 Sunonwealth Electric Machine Industry Co., Ltd. Blower-type fan with dual inlet arrangements

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3730642A (en) * 1971-10-14 1973-05-01 Vernco Corp Cooling means for motor of a wet pick-up vacuum sweeper
US6328529B1 (en) * 1998-04-28 2001-12-11 Denso Corporation Cooling device with support members facing fin
US20020057022A1 (en) * 1999-03-31 2002-05-16 Katsuhiko Yamamoto Fan motor
EP1122444A2 (de) * 2000-02-01 2001-08-08 ebm Werke GmbH & Co. KG Radialventilator und Düse für einen Radialventilator
US20020057965A1 (en) * 2000-11-16 2002-05-16 Delta Electronics Inc. Centrifugal fan
US20020146318A1 (en) * 2001-03-30 2002-10-10 Sunonwealth Electric Machine Industry Co., Ltd. Blower-type fan with dual inlet arrangements

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102042652A (zh) * 2009-10-26 2011-05-04 广东松下环境系统有限公司 多室吸入换气产品
CN102042652B (zh) * 2009-10-26 2015-01-14 广东松下环境系统有限公司 多室吸入换气产品
US9885367B2 (en) 2012-07-05 2018-02-06 Minebea Co., Ltd. Centrifugal fan
US10072842B2 (en) 2014-02-21 2018-09-11 Noritz Corporation Water heater
US9933185B2 (en) 2014-02-24 2018-04-03 Noritz Corporation Fan and water heater provided with the same, and impeller and water heater provided with the same
US10473359B2 (en) 2014-02-24 2019-11-12 Noritz Corporation Fan and water heater provided with the same, and impeller and water heater provided with the same
US10473360B2 (en) 2014-02-24 2019-11-12 Noritz Corporation Fan and water heater provided with the same, and impeller and water heater provided with the same
CN105370624A (zh) * 2015-11-30 2016-03-02 广东美的制冷设备有限公司 离心风机及移动式空调器
CN110905850A (zh) * 2019-10-28 2020-03-24 天津怡和嘉业医疗科技有限公司 用于通气治疗设备的叶轮、风机以及通气治疗设备
EP4242465A1 (de) * 2022-03-07 2023-09-13 GrowTrend Biomedical Co., Ltd. Gebläse

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