EP3211247B1 - Ventilateur à écoulement diagonal - Google Patents

Ventilateur à écoulement diagonal Download PDF

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Publication number
EP3211247B1
EP3211247B1 EP14904616.1A EP14904616A EP3211247B1 EP 3211247 B1 EP3211247 B1 EP 3211247B1 EP 14904616 A EP14904616 A EP 14904616A EP 3211247 B1 EP3211247 B1 EP 3211247B1
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EP
European Patent Office
Prior art keywords
wheel
fan
diagonal flow
flow fan
wheel hub
Prior art date
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Active
Application number
EP14904616.1A
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German (de)
English (en)
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EP3211247A4 (fr
EP3211247A1 (fr
Inventor
Shuhua HE
Weidong Chen
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.)
Fans Tech Electric Co Ltd
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Fans Tech Electric Co Ltd
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Publication date
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Publication of EP3211247A4 publication Critical patent/EP3211247A4/fr
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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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/06—Helico-centrifugal 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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially 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
    • 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
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • 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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
    • F04D29/162—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of a centrifugal flow wheel
    • 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
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow 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
    • F04D29/40—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
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/662—Balancing of rotors

Definitions

  • This application relates to a ventilation apparatus, and particularly relates to a diagonal flow fan.
  • a diagonal flow fan in the conventional technology is shown in Figures 1 and 2 , which includes a motor 6, a fan wheel 2, a blade 4, and a balancing component 9.
  • the balancing component 9 is configured to maintain dynamic balance of the diagonal flow fan and is fixedly mounted at the blade 4, and the dynamic balancing effect is inferior, causing that the diagonal flow fan has defects such as having a low efficiency, a high noise, and being difficult to debug the dynamic balance.
  • an air inlet cover of the diagonal flow fan is not provided with an air guiding ring, resulting in a large amount of air loss at an air inlet of the air inlet cover and a low energy efficiency of the fan.
  • the European Union stipulates lowest energy efficiency standards respectively for different types of fans in a power range from 0.125KW to 500KW, and these standards are stipulated according to the types of fans, a measurement device and an electric power consumed.
  • the ErP Directive is implemented in two stages in 2013 and 2015.
  • the energy efficiency limit in the ErP Directive set by the European Union is rather stringent, and even in the first stage, 30% of all the existing fans will fail to comply with the new regulation. With the implementation of the second stage started from 2015, 20% more of the existing products will fail to comply with the energy efficiency requirement.
  • US 2012/020778 A1 discloses a diagonal fan for gaseous media which has a diagonal impeller with a plurality of vanes, which are fastened on a carrier plate, and a guide device, adjoining the diagonal impeller in the axial direction on the outflow side, for increasing the pressure of the medium, with a plurality of guide vanes.
  • the vanes of the diagonal impeller and/or the guide vanes of the guide device are three-dimensionally twisted.
  • DE 958 147 C discloses a paddle wheel for blowers, in particular for vacuum cleaners, in which the blades are arranged between two side plates. One of the two side plates together with the blades forms a plastic part to which the other metal side plate is fastened.
  • US 2008/085188 A1 discloses a mixed flow fan having a housing, a stator, and an impeller, with the housing having a downward extending skirt and an upper perimeter as air inlet and a lower perimeter as air exhaust, a central hub with an outer edge, and a plurality of struts connected to the upper perimeter of the skirt and to the outer edge of the central hub.
  • the outer edge of the central hub may be concave or curvilinear or conical.
  • a stator cup which houses the motor is connected to the outer wall of the impeller and to the central hub.
  • EP 0 781 928 A1 discloses a method of balancing fan rotors, particularly electric fans for use in motor vehicles.
  • the fan rotor is balanced by the addition of material in at least one selected position on the fan rotor wherein the material is added by the application of one or more metal staples.
  • a technical issue to be addressed by the present application is to provide a diagonal flow fan which has a compact structure and a high efficiency.
  • a diagonal flow fan includes an air duct, a motor, a fan wheel, a blade, an air guiding ring, and a wheel hub
  • the air guiding ring has one end connected to the air duct
  • the blade and the wheel hub are located inside the fan wheel
  • the blade has one end connected to the wheel hub and another end connected to the fan wheel
  • the motor is located inside the wheel hub and connected to the wheel hub
  • the air guiding ring has another end located at an inner side of the fan wheel, and a gap exists between the air guiding ring and the fan wheel.
  • a balancing component configured to maintain dynamic balance of the diagonal flow fan is fixedly mounted at an outer peripheral surface of the fan wheel.
  • the balancing component is a balance nail.
  • the air guiding ring is in a trumpet shape, and the end of the air guiding ring that is connected to the air duct is flared outwards.
  • a size S of the gap is 0mm ⁇ S ⁇ 10mm.
  • the blade and the wheel hub are formed as an integral structure.
  • a protrusion is provided on the blade, and the protrusion is fitted into a locking slot of the fan wheel, and the protrusion and the fan wheel are welded by ultrasonic welding process.
  • the motor is an outer rotor type motor, and an outer rotor shaft of the motor is inserted into a central hole of the wheel hub.
  • the diagonal flow fan further includes a steel ring, wherein the steel ring is fixedly connected to the motor and the wheel hub respectively.
  • the steel ring is fixedly connected to the wheel hub by a screw, and the steel ring is fixedly connected to the motor by riveting and/or welding.
  • the present application has the following advantages.
  • a diagonal flow fan is provided according to an embodiment of the present application, which includes an air duct, a motor, a fan wheel, a blade, an air flow guide ring, and a wheel hub, and a gap exists between the fan wheel and the air guiding ring.
  • the airflow flowing through the air guiding ring is guided by the gap, and the backflow loss of airflow can be reduced by controlling the size of the gap, thus, the working efficiency of the diagonal flow fan is improved.
  • the smaller the gap the higher the efficiency.
  • the balancing component is fixedly mounted at an outer peripheral surface of the fan wheel to achieve dynamic balance of the diagonal flow fan, thus addressing the issues of low efficiency and inferior dynamic balance of the diagonal flow fan in the conventional technology in which dynamic balance is achieved by using a balance clip.
  • the blade is fixed to the fan wheel by ultrasonic welding, thus, the issue of inferior appearance caused by fusion welding is addressed, and also the issue of scraps falling into the fan resulted from the sputtering of a hot melt adhesive in welding is avoided.
  • the outer rotor of the motor and the steel ring are connected by riveting and/or welding, thus the steel ring is not apt to fall off.
  • the motor shaft and the fan wheel are cooperated with each other in a concentric positioning configuration, thus, the issue that an overly large dynamic imbalance caused by a poor assembling concentricity between the fan wheel and the steel ring is addressed.
  • the basic concept of the present application is to provide a diagonal flow fan, to address the technical issues that a diagonal flow fan in the conventional technology has a low efficiency.
  • the diagonal flow fan according to the present application includes an air duct, a motor, a fan wheel, a blade, an air guiding ring, and a wheel hub.
  • the air guiding ring has one end connected to the air duct.
  • the blade and the wheel hub are located inside the fan wheel, and the blade has one end connected to the wheel hub and another end connected to the fan wheel.
  • the motor is located inside the wheel hub and connected to the wheel hub.
  • the air guiding ring has another end located at an inner side of the fan wheel, and a gap exists between the air guiding ring and the fan wheel.
  • FIG. 7 illustrates the invention.
  • the diagonal flow fan includes an air duct 8, a motor 6, a fan wheel 2, a blade 4, an air guiding ring 1, and a wheel hub 3.
  • the air guiding ring 1 has one end connected to the air duct 8.
  • the blade 4 and the wheel hub 3 are located inside the fan wheel 2, and the blade 4 has one end connected to the wheel hub 3 and another end connected to the fan wheel 2.
  • the motor 6 is located inside the wheel hub 3 and connected to the wheel hub 3.
  • the air guiding ring 1 has another end located at an inner side of the fan wheel 2, and a gap exists between the air guiding ring 1 and the fan wheel 2. It is to be noted that, in this embodiment, the air guiding ring 1 is connected to the air duct 8 by electric welding, and in other embodiments, the air guiding ring 1 and the air duct 8 may also be fixedly connected by other connecting methods.
  • the air guiding ring 1 of the diagonal flow fan has a trumpet-shaped structure with a flared mouth facing outwards.
  • the air guiding ring 1 has one end flared outwards, and an outwardly rolled edge is formed at a tail end of the outwards flared end, and another end of the air guiding ring 1 is located at the inner side of the fan wheel 2.
  • the outwardly rolled edge at the outwards flared end of the air guiding ring 1 is connected to the air duct 8.
  • FIG. 6 another end of the air guiding ring 1 is located at the inner side of the fan wheel 2, and a gap exists between the air guiding ring 1 and the fan wheel 2.
  • the gap has a size S, and 0mm ⁇ S ⁇ 10mm, the backflow loss of airflow can be reduced by controlling the size of the gap, thus improving the energy efficiency of the fan.
  • the smaller the gap the higher the efficiency of the fan. It is concluded by repeated tests that, the best processing size of the gap between the air guiding ring 1 and the fan wheel 2 is 2.5mm, and with this best processing size, the energy efficiency can be higher than ERP2015 requirement by 6% to 8%.
  • the blade 4 and the wheel hub 3 are embodied as an integral structure, and are mainly formed integrally by injection molding, to prevent loosening of the blade 4 and the wheel hub 3.
  • the blade 4 and the wheel hub 3 are arranged inside the fan wheel 2.
  • the blade 4 is provided with a protrusion
  • the fan wheel 2 is provided with a locking slot configured to engage with the protrusion of the blade 4.
  • the protrusion of the blade 4 can be fitted into the locking slot of the fan wheel 2, to fixedly connect the blade 4 to the fan wheel 2.
  • the protrusion can be welded to a portion, close to the periphery of the locking slot, of the fan wheel by ultrasonic welding, to allow the fixed connection between the blade 4 and the fan wheel 2 to be more reliably.
  • the number of the blade 4 is more than two, and multiple blades 4 are twisted in the same direction, and the twisting direction of the blades 4 is almost the same as the rotation direction of the fan wheel.
  • a balancing component 9 is provided on an outer peripheral surface of the fan wheel 2 in a range of 360 degrees to achieve dynamic balance.
  • the dynamic balance is achieved by mounting a balance nail 9 on an upper side and a lower side of the outer peripheral surface of the fan wheel 2 in a range of 360 degrees, and multiple balance nails 9 may be provided according to the requirement for achieving dynamic balance.
  • a balance nail is employed to achieve dynamic balance, which addresses the issues of low efficiency and inferior dynamic balance of the diagonal flow fan in the conventional technology in which dynamic balance is achieved by using a balance clip.
  • the diagonal flow fan in the conventional technology has a dynamic balancing efficiency ranging from 10minutes per set to 20minutes per set and requires eight to twelve balance clips.
  • the diagonal flow fan according to this embodiment has a dynamic balancing efficiency ranging from 3minutes per set to 5minutes per set and requires four to six balance nails.
  • a balance nail is employed as the balancing component.
  • five holes are provided in a top end of the wheel hub 3, one of the five holes is located in the center of the wheel hub 3, and an outer rotor shaft of the motor is inserted into the central hole of the wheel hub, to achieve a concentric positioning configuration of the motor shaft and the fan wheel.
  • a steel ring 5 is fixed on the wheel hub 3, and an inner wall of the wheel hub 3 is provided with a reinforcing rib configured to support the steel ring 5 and the motor 6.
  • the wheel hub 3 and the steel ring 5 are fixed to each other by screw, and the steel ring 5 and the rotor of the motor 6 are connected by riveting and/or welding, thus preventing the steel ring from falling off.
  • the motor shaft and the fan wheel employ a concentric positioning configuration, thus addressing the issue that an overly large dynamic imbalance is caused by a poor assembling concentricity between the fan wheel and the steel ring.
  • a rotor of the motor 6 employs an electro-coating process, thus preventing the service life of the motor from being reduced by rusting of the rotor.
  • the motor 6 employs an outer rotor type motor configuration, and the outer rotor type motor 6 is mounted inside the wheel hub 3, and the outer rotor shaft of the motor 6 is mounted in the central hole of the wheel hub 3, the motor shaft and the fan wheel 2 are cooperated with each other in a concentric positioning configuration, thus addressing the issue that an overly large dynamic imbalance is caused by a poor assembling concentricity between the fan wheel 2 and the steel ring 5.
  • An initial imbalance amount of the fan wheel in the diagonal flow fan in the conventional technology ranges from 5grams to 10grams, and an initial imbalance amount of the fan wheel of the diagonal flow fan in this embodiment ranges from 2grams to 4grams.
  • the shape of the wheel hub 3 changes from a cylindrical shape to a conical shape.
  • a central part of a rear guide vane 7 is fixedly connected to the motor 6, a rear end of the rear guide vane 7 is connected to the air duct 8, and the rear guide vane 7 is concentrically sleeved into the air duct 8, and the rear guide vane 7 and the air duct 8 are fixed by a screw.
  • the unit of the flow rate obtained from testing an airflow amount of a fan is m 3 /h, thus, the unit of the flow rate needs to be converted into m 3 /s when calculating actual energy efficiency under a static pressure.
  • test and calculation results are as follows.
  • Table 1 is a comparison table between actual energy efficiency values of the conventional diagonal flow fans and lowest energy efficiency values required by the European Union standard.
  • Table 1 serial number fan wheel diameter(ln.) voltage/ frequency static pressure (Pa) full pressure (Pa) flow (m3/h) power( W) ERP2013 requirement ERP2015 requirement actual energy efficiency pressure) 1 10 230V/50Hz 264.0 271.0 586.2 148.9 27.80% 30.8% 28.9% 2 12 230V/50Hz 352.0 355.3 660.1 260.0 30.40% 33.4% 24.8%
  • Table 2 is a comparison table between actual energy efficiency values of diagonal flow fans according to the present application and the lowest energy efficiency values required by the European Union standard.
  • Table 2 serial number fan wheel diameter (ln.) voltage/ frequency static pressure (Pa) full pressure (Pa) flow rate (m 3 /h) Power (W) ERP2013 lowest requirement ERP2015 lowest requirement actual energy efficiency (static pressure) 1 10 230V/50Hz 217.4 246.4 751.6 140.8 27.6% 30.6% 32.2% 2 12 230V/50Hz 302.6 316.6 1234.6 251.7 30.2% 33.2% 41.2%
  • Table 3 is a comparison table between the actual energy efficiency values of the diagonal flow fans according to the present application and the actual energy efficiency values of the conventional diagonal flow fans.
  • Table 3 serial number fan wheel diameter (ln.) voltage/ frequency ERP2013 lowest requirement ERP2015 lowest requirement actual energy efficiency (static pressure) 1 10(conventional technology) 230V/50Hz Pass No 28.9% 10(the present application) 230V/50Hz Pass Pass 32.2% (increased by 3.3% under the same condition) 2 12(conventional technology) 230V/50Hz No No 24.8% 12(the present application) 230V/50Hz Pass Pass 41.2% (increased by 16.4% under the same condition)
  • the improved diagonal flow fan according to the present application has a significantly improved energy efficiency, and complies with the energy efficiency standards set by the European Union (Data in accordance with ErP Directive 327/2011 of the European Parliament).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (8)

  1. Ventilateur à écoulement diagonal, comprenant un conduit d'air (8), un moteur (6), une roue de ventilateur (2), une pale (4), un anneau de guidage d'air (1) et un moyeu de roue (3), l'anneau de guidage d'air (1) ayant une extrémité connectée au conduit d'air (8), et la pale (4) et le moyeu de roue (3) étant situés à l'intérieur de la roue de ventilateur (2), la pale (4) ayant une extrémité connectée au moyeu de roue (3) et une autre extrémité connectée à la roue de ventilateur (2), le moteur (6) étant situé à l'intérieur du moyeu de roue (3) et étant connecté au moyeu de roue (3), l'anneau de guidage d'air (1) ayant une autre extrémité située au niveau d'un côté intérieur de la roue de ventilateur (2), et un espace existant entre l'anneau de guidage d'air (1) et la roue de ventilateur (2) ;
    caractérisé en ce
    qu'un composant d'équilibrage (9) configuré pour maintenir un équilibre dynamique du ventilateur à écoulement diagonal est monté fixement au niveau d'une surface périphérique extérieure de la roue de ventilateur (2) et en ce que le composant d'équilibrage (9) est un clou d'équilibrage.
  2. Ventilateur à écoulement diagonal selon la revendication 1, dans lequel l'anneau de guidage d'air (1) présente une forme en trompette, et l'extrémité de l'anneau de guidage d'air (1) qui est connectée au conduit d'air (8) est évasée vers l'extérieur.
  3. Ventilateur à écoulement diagonal selon la revendication 1, dans lequel une dimension S de l'espace est telle que 0mm≤S≤10mm.
  4. Ventilateur à écoulement diagonal selon la revendication 1, dans lequel la pale (4) et le moyeu de roue (3) sont formés sous forme de structure intégrale.
  5. Ventilateur à écoulement diagonal selon la revendication 1, dans lequel une saillie est prévue sur la pale (4), et la saillie est ajustée dans une fente de verrouillage de la roue de ventilateur (2), et la saillie et la roue de ventilateur (2) sont soudées par un processus de soudage par ultrasons.
  6. Ventilateur à écoulement diagonal selon la revendication 1, dans lequel le moteur (6) est un moteur de type à rotor extérieur, et un arbre de rotor extérieur du moteur (6) est inséré dans un trou central du moyeu de roue (3).
  7. Ventilateur à écoulement diagonal selon la revendication 1, comprenant en outre un anneau en acier (5), l'anneau en acier (5) étant connecté fixement au moteur (6) et au moyeu de roue (3), respectivement.
  8. Ventilateur à écoulement diagonal selon la revendication 7, dans lequel l'anneau en acier (5) est connecté fixement au moyeu de roue (3) par une vis, et l'anneau en acier (5) est connecté fixement au moteur (6) par rivetage et/ou soudage.
EP14904616.1A 2014-10-22 2014-10-22 Ventilateur à écoulement diagonal Active EP3211247B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/089118 WO2016061747A1 (fr) 2014-10-22 2014-10-22 Ventilateur à écoulement diagonal

Publications (3)

Publication Number Publication Date
EP3211247A1 EP3211247A1 (fr) 2017-08-30
EP3211247A4 EP3211247A4 (fr) 2018-10-24
EP3211247B1 true EP3211247B1 (fr) 2019-11-27

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Country Link
US (1) US20170045060A1 (fr)
EP (1) EP3211247B1 (fr)
CN (1) CN106471259A (fr)
WO (1) WO2016061747A1 (fr)

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US20170045060A1 (en) 2017-02-16
EP3211247A4 (fr) 2018-10-24
EP3211247A1 (fr) 2017-08-30

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