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EP3619436B1 - Blower and air conditioning apparatus having the same - Google Patents

Blower and air conditioning apparatus having the same Download PDF

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Publication number
EP3619436B1
EP3619436B1 EP18797937.2A EP18797937A EP3619436B1 EP 3619436 B1 EP3619436 B1 EP 3619436B1 EP 18797937 A EP18797937 A EP 18797937A EP 3619436 B1 EP3619436 B1 EP 3619436B1
Authority
EP
European Patent Office
Prior art keywords
electrode
shroud
blower
air conditioner
conditioner 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.)
Active
Application number
EP18797937.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3619436A4 (en
EP3619436A1 (en
Inventor
Shinji Goto
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority claimed from PCT/KR2018/005435 external-priority patent/WO2018208119A1/en
Publication of EP3619436A1 publication Critical patent/EP3619436A1/en
Publication of EP3619436A4 publication Critical patent/EP3619436A4/en
Application granted granted Critical
Publication of EP3619436B1 publication Critical patent/EP3619436B1/en
Active 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • F04D29/687—Plasma actuators therefore
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
    • 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
    • F04D29/56—Fluid-guiding means, e.g. diffusers adjustable
    • F04D29/563—Fluid-guiding means, e.g. diffusers adjustable 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
    • 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
    • F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial 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
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • 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
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/2406—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes
    • H05H1/2425—Generating plasma using dielectric barrier discharges, i.e. with a dielectric interposed between the electrodes the electrodes being flush with the dielectric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/96—Preventing, counteracting or reducing vibration or noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/10—Purpose of the control system
    • F05B2270/20—Purpose of the control system to optimise the performance of a machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2240/00—Components
    • F05D2240/20—Rotors
    • F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05D2240/307—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the tip of a rotor blade
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/01—Purpose of the control system
    • F05D2270/17—Purpose of the control system to control boundary layer
    • F05D2270/172—Purpose of the control system to control boundary layer by a plasma generator, e.g. control of ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/002—Influencing flow of fluids by influencing the boundary layer
    • F15D1/0065—Influencing flow of fluids by influencing the boundary layer using active means, e.g. supplying external energy or injecting fluid
    • F15D1/0075—Influencing flow of fluids by influencing the boundary layer using active means, e.g. supplying external energy or injecting fluid comprising electromagnetic or electrostatic means for influencing the state of the fluid, e.g. for ionising the fluid or for generating a plasma

Definitions

  • the present disclosure relate to an air conditioner having a blower.
  • US 2017/130723 A1 relates to a centrifugal blower.
  • US 2009/065064 A1 relates to compressor tip gap flow control using plasma actuators.
  • blower including a plasma actuator disclosed in Japanese Patent Publication No. 2014-103094 in order to actively solve the above problem by controlling the flow of air in the blower.
  • the blower disclosed in Japanese Patent Publication No. 2014-103094 includes a turbine formed of a metal material, a cylindrical shroud surrounding the turbine, and a plasma actuator provided on an outer circumferential end of the turbine blade and an inner circumferential surface of the shroud.
  • the plasma actuator includes a power source for applying a high-voltage, high-frequency alternating-current voltage between an insulated coating wire of a coil shape installed along the circumferential direction on the inner surface of the shroud and an outer peripheral end of the blade.
  • a power source for applying a high-voltage, high-frequency alternating-current voltage between an insulated coating wire of a coil shape installed along the circumferential direction on the inner surface of the shroud and an outer peripheral end of the blade.
  • the material of the propeller fan must be metal.
  • the clearance between the outer circumferential end of the propeller fan and the inner circumferential surface of the shroud must be set very small. Therefore, an assembly error between the propeller fan and the shroud must be strictly controlled and the manufacturing cost is greatly increased.
  • Japanese Patent Publication No. 2014-103094 has a limitation in applying to general air conditioners in which the manufacturing cost is strictly limited and the material of the propeller fan is limited to a resin material.
  • the induced airflow generated in the plasma actuator flows in the radial direction, the induced airflow flows to a portion of the outer peripheral end of the blade. As a result, unintended disturbance or vortex occurs.
  • the airflow flowing through the blade surface does not sufficiently flow at the outer peripheral end having the fastest velocity, so that even if the leakage flow can be suppressed, the blade cannot be utilized as efficiently as possible.
  • an air conditioner according to claim 1.
  • Embodiments of the invention are set out in the dependent claims.
  • the first electrode and the second electrode may be alternately arranged along the circumferential direction of the shroud.
  • the first electrode may protrude from the inner circumferential surface of the shroud.
  • the second electrode may be disposed outside the first electrode along the radial direction of the shroud.
  • a plurality of the actuators may be spaced apart from each other along a circumferential direction of the shroud.
  • the air conditioner may further comprise a plurality of power sources to apply a voltage to each of the plurality of actuators; and a control unit to control the plurality of power sources.
  • the control unit may be configured to independently control the plurality of power sources.
  • the control unit may be configured to apply a voltage to a power source nearest to an outer peripheral end of the fan when the fan rotates.
  • the first electrode and the second electrode may be disposed so as to overlap each other at least in a section along the circumferential direction of the shroud.
  • the first electrode may be disposed obliquely with respect to the inner circumferential surface of the shroud.
  • the shroud may include a receiving groove to receive at least a portion of the first electrode.
  • the shroud may include a bell mouth formed in a cylindrical shape; a flow reducing portion provided on an upstream side of the bell mouth to reduce a flow path area; and a diffuser provided on a downstream side of the bell mouth to enlarge a flow path area.
  • the actuator may be provided on an inner peripheral surface of the bell mouth.
  • the actuator is a plasma actuator configured to generate plasma by a dielectric barrier discharge (DBD).
  • DBD dielectric barrier discharge
  • the leakage flow is suppressed by the plasma actuator, so that the high efficiency and low noise can be achieved.
  • the plasma actuator can be installed in the blower at a low cost, the productivity of the blower and the air conditioner is improved.
  • first may be referred to as a second component
  • second component may also be referred to as a first component
  • a blower 100 according to a first embodiment of the present disclosure will be described with reference to Figs. 1 to 5 .
  • the blower 100 of the first embodiment may be provided in, for example, an outdoor unit of an air conditioner. Meanwhile, the blower 100 according to the first embodiment of the present disclosure may be provided not only in the outdoor unit but also in an indoor unit of the air conditioner.
  • the blower 100 is an axial flow fan, and includes a propeller fan 1 made of a resin material having one or a plurality of blades 12, a cylindrical-shaped shroud 2 disposed around the propeller fan 1, and a plasma actuator 3 installed in the shroud 2 and configured to generate an induced flow (IF) along an inner circumferential surface of the shroud 2.
  • a propeller fan 1 made of a resin material having one or a plurality of blades 12
  • a cylindrical-shaped shroud 2 disposed around the propeller fan 1
  • a plasma actuator 3 installed in the shroud 2 and configured to generate an induced flow (IF) along an inner circumferential surface of the shroud 2.
  • the blower 100 includes a motor 4 for rotating the propeller fan 1, a power source 5 for applying a voltage to the plasma actuator 3, and a control unit 6 which is constituted by software and controls the power supply 5.
  • the propeller fan 1 includes a cylindrical hub 11 formed of a resin material and rotated by the motor 4 and provided at a central portion of the propeller fan 1, and three blades 12 provided on the outer peripheral surface of the hub 11 at regular intervals.
  • the blade 12 has a shape curved in a helical shape along the direction of the rotation axis of the hub 11.
  • blower 100 when the propeller fan 1 is rotated by the motor 4, airflow is formed along the axial direction (mainstream direction) of the propeller fan 1 from the lower side to the upper side in Fig. 1 .
  • the shroud 2 is provided with a bell mouth 22 formed in a cylindrical shape and a flow reduction portion provided on the upstream side of the bell mouth 22 to reduce an area of a flow path through which airflow introduced by the propeller fan 1 flows and a diffuser 23 provided on the downstream side of the bell mouth 22 to enlarge the area of the flow path.
  • the bell mouth 22 is disposed such that its inner peripheral surface faces the outer peripheral end 13 of the blade 12 of the propeller fan 1.
  • a clearance is formed between the inner peripheral surface of the bell mouth 22 and the outer peripheral end 13 of the blade 12.
  • the clearance may have a width of 1 mm or more and 100 mm or less along the radial direction of the bell mouth 22.
  • This clearance can be determined from the positional accuracy or assembly accuracy of the propeller fan 1 relative to the shroud 2.
  • the plasma actuator 3 generates plasma by a dielectric barrier discharge (DBD) to form an induced flow (IF) along the inner circumferential surface of the bell mouth 22.
  • DBD dielectric barrier discharge
  • the plasma actuator 3 includes a pair of electrodes 31 and 32 connected to a power source 5 having a predetermined voltage and a predetermined frequency and a dielectric 33 formed between the pair of electrodes 31 and 32.
  • a plurality of plasma actuators 3 are aligned in the circumferential direction of the bell mouth 22, and each electrode included in each plasma actuator 3 is aligned in parallel with the inner circumferential surface of the bell mouth 22.
  • the respective electrodes of the plasma actuator 3 are arranged so as to be located in the passage region of each blade 12.
  • the plasma actuator 3 is not provided on the inner peripheral surface of the flow reduction portion 21 of the shroud 2 in the blower 100 according to the first embodiment.
  • Fig. 2a is a plan view of a part of the inner circumferential surface of the bell mouth 22 according to the direction in which the electrodes are arranged
  • Fig. 2b is a sectional view thereof.
  • each of the plasma actuators 3 includes a pair of electrodes 31 and 32.
  • the pair of electrodes 31 and 32 includes a first electrode 31 provided on the inner peripheral surface of the bell mouth 22 and a second electrode 32 embedded in the bell mouth 22.
  • the second electrode 32 is disposed outside the first electrode 31 along the radial direction of the shroud 2.
  • the first electrode 31 is exposed on the inner peripheral surface of the bell mouth 22 and the second electrode 32 is embedded in the bell mouth 22. Therefore, in the following description, the first electrode 31 will be referred to as an exposed electrode, and the second electrode 32 will be referred to as an embedded electrode.
  • the exposed electrode 31 is inclined with respect to the inner peripheral surface of the bell mouth 22 and extends obliquely with respect to the direction of the rotation axis of the hub 11.
  • the inclined or curved shape of the exposed electrode 31 corresponds to a shape formed when the outer peripheral end 13 of the blade 12 is projected on the inner peripheral surface of the bell mouth 22 in the radial direction of the bell mouth 22.
  • a layer of dielectric 33 is formed between the exposed electrode 31 and the embedded electrode 32.
  • the dielectric 33 is disposed on the outside of the exposed electrode 31 along the radial direction of the bell mouth 22 and the embedded electrode 32 is disposed on the outside of the dielectric 33. That is, the exposed electrode 31, the dielectric 33, and the embedded electrode 32 are arranged in order along the radial direction of the bell mouth 22.
  • a central axis passing through the center of the exposed electrode 31 and a central axis passing through the center of the embedded electrode 32 are arranged to be shifted from each other along the arrangement direction of the electrodes.
  • a circumferential distance along the circumferential direction of the bell mouth 22 between the exposed electrode 31 and the embedded electrode 32 constituting one plasma actuator 3 is smaller than the distance to the adjacent other plasma actuator 3.
  • the exposed electrode 31 and the embedded electrode 32 are arranged so as to generate an induced flow (IF) in one direction.
  • the exposed electrode 31 and the embedded electrode 32 are arranged to overlap at least in a section along the circumferential direction of the bell mouth 22 so that the circumferential distance between the exposed electrode 31 and the embedded electrode 32 along the circumferential direction of the bell mouth 22 is zero, and the plasma actuators 3 adjacent to each other are arranged at regular intervals.
  • plasma is formed on the inner circumferential surface of the bell mouth 22 adjacent to the exposed electrode 31.
  • the exposed electrode 31 protrudes radially inward from the inner circumferential surface of the bell mouth 22 and is disposed within the clearance.
  • the exposed electrode 31 is disposed so as to be spaced apart from the outer peripheral end 13 of the blade 12 by a predetermined distance.
  • a side surface of the exposed electrode 31 and a side surface of the embedded electrode 32 are arranged in parallel with the inner circumferential surface of the bell mouth 22 and the plurality of exposed electrodes 31 and the embedded electrodes 32 are alternately arranged along the circumferential direction of the bell mouth 22.
  • Each of the plurality of exposed electrodes 31 and the embedded electrodes 32 are disposed apart from each other along the circumferential direction of the bell mouth 22.
  • the power supply 5 has a plurality of independently controllable power supply systems. It is preferable that the plurality of power supply systems are configured to have the same number as the number of the plasma actuators 3 divided by the number of the blades 12. However, the number and type of power supply systems that can be independently controlled may be provided in various numbers and types.
  • the power source 5 is configured to apply a predetermined high-voltage, high-frequency AC voltage so as to generate plasma between the exposed electrode 31 and the embedded electrode 32.
  • the power source 5 may be configured to apply an AC voltage or a pulse voltage of 3 kV, 10 kH between the exposed electrode 31 and the embedded electrode 32.
  • the control unit 6 is configured to control the ON / OFF of the voltage of the plurality of plasma actuators 3 in synchronization with the rotation of the propeller fan 1.
  • control unit 6 acquires the current rotation angle of the propeller fan 1 from the encoder or armature current installed in the motor 4, and determines which of the plurality of plasma actuators 3 is to be driven in accordance with the rotation angle of the propeller fan 1 and apply the voltage of the power source 5 to the corresponding plasma actuator 3.
  • control unit 6 may operate the plasma actuator 3 closest to the outer peripheral end 13 of the blade 12 of the propeller fan 1.
  • Synchronization with the rotation of the propeller fan 1 means not only turning the voltage ON at a time when the outer peripheral end 13 of the blade 12 passes through the exposed electrode 31 but also turning the voltage ON at a predetermined time before or after the time when the outer peripheral end 13 of the blade 12 passes through the exposed electrode 31.
  • plasma is formed every time the outer peripheral end 13 of the blade 12 of the propeller fan 1 passes the exposed electrode 31, an induced flow (IF) is formed along the inner peripheral surface of the bell mouth 22.
  • the induced flow (IF) is formed along the inner circumferential surface of the bell mouth 22 in a direction perpendicular to the outer peripheral end 13 of the blade 12. That is, the induced flow (IF) is formed as a flow having an axial component and a circumferential component along the inner peripheral surface of the bell mouth 22.
  • a high-voltage, high-frequency AC voltage is applied between a propeller fan 1 having a metal material and a coating wire provided on the inner circumferential surface of the shroud 2 to form plasma, an induced flow (IF) flowing in the radial direction of the shroud 2 is formed.
  • IF induced flow
  • the induced flow (IF) flowing in the radial direction also flows on the outer peripheral end 13 of the blade 12, so that the leakage flow is suppressed.
  • air cannot be pushed out at the outer peripheral end of the blade 12 where the flow of air is the fastest, which causes a decrease in the efficiency of the blower.
  • a pair of the exposed electrodes 31 and the embedded electrodes 32 are formed on the inner peripheral surface of the bell mouth 22, the induced flow (IF) flows in the clearance along the inner peripheral surface of the bell mouth 22.
  • the efficiency of the blower 100 is improved and the noise is reduced.
  • the blower 100 has a structure in which the exposed electrode 31 is provided on the inner peripheral surface of the bell mouth 22.
  • one surface of the exposed electrode 31 is provided so as to coincide with the inner peripheral surface of the bell mouth 22.
  • spaces between the plurality of exposed electrodes 31 are filled with the dielectric 33 or another resin or the like to form the inner peripheral surface of the bell mouth 22.
  • one surface of the exposed electrode 31 and one surface of the embedded electrode 32 are formed to be inclined so as to intersect the inner peripheral surface of the bell mouth 22.
  • the bell mouth 22 includes a receiving groove to receive a portion of the radially outer side of the exposed electrode 31.
  • a portion of the radially inner side of the exposed electrode 31 is not accommodated in the receiving groove but protrudes from the inner peripheral surface of the bell mouth 22.
  • the plasma actuator 3 forms the induced flow (IF) along the inner peripheral surface of the bell mouth 22, so that the leakage flow of the propeller fan 1 can be suppressed.
  • IF induced flow
  • blower 100 according to a second embodiment of the present disclosure that is not covered by the claimed invention will be described with reference to Fig. 8a and 8B .
  • the blower 100 has a structure in which the exposed electrode 31 and the embedded electrode 32 of the plasma actuator 3 are arranged along the circumferential direction of the shroud 2, the induced flow (IF) generated by the plasma actuator 3 flows in a direction perpendicular to the peripheral end 13 of the blade 12.
  • the exposed electrode 31, the embedded electrode 32, and the dielectric 33 of the plasma actuator 3 are formed in a ring shape and aligned in only one set in the direction of the rotational axis of the hub 11.
  • the plasma actuator 3 provided at the bell mouth 22 forms a induced flow (IF) flowing in the axial direction along the inner peripheral surface of the bell mouth 22.
  • the structure of the pair of electrodes constituting the plasma actuator 3 can be simplified.
  • IF cylindrical induced flow
  • a set of plasma actuator 3 is provided in the blower 100 according to the second embodiment shown in Fig. 8a and 8B , a plurality of sets of plasma actuators 3 may be provided.
  • the plasma actuator 3 is installed only in the propeller fan 1.
  • a set of the exposed electrodes 31 and the embedded electrodes 32 are formed along the outer peripheral end of the blade 12 of the propeller fan 1, and the induced flow (IF) is generated on the outer peripheral end of the blade 12.
  • the induced flow (IF) can be formed directly on the outer peripheral end of the blade 12 where the leakage flow occurs , so that the suppression effect of the leakage flow can be obtained even with the small induced flow (IF).
  • a pair of electrodes for forming plasma in the plasma actuator may be installed only in the shroud to generate plasma regardless of the size of the clearance.
  • the plasma actuator is not limited to forming an induced flow (IF) by dielectric barrier discharge, and it is also possible to form an induced flow (IF) by, for example, atmospheric pressure glow discharge.
  • the plasma actuator may be installed not only on the inner circumferential surface of the bell mouth but also on the inner circumferential surface of the diffuser. Further, the plasma actuator may be provided only on the inner peripheral surface of the diffuser.
  • the blower may be configured to perform an air cleaning function by using a sterilizing component or an air cleaning component of plasma generated in the plasma actuator.
  • the leakage flow is suppressed by the plasma actuator, so that the high efficiency and low noise can be achieved.
  • the plasma actuator can be installed in the blower at a low cost, the productivity of the blower and the air conditioner is improved.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Plasma Technology (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
  • Other Air-Conditioning Systems (AREA)
EP18797937.2A 2017-05-12 2018-05-11 Blower and air conditioning apparatus having the same Active EP3619436B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2017096039A JP2018193876A (ja) 2017-05-12 2017-05-12 送風機、及び、空気調和装置
KR1020180037531A KR102455234B1 (ko) 2017-05-12 2018-03-30 송풍기 및 이를 가지는 공기 조화 장치
PCT/KR2018/005435 WO2018208119A1 (en) 2017-05-12 2018-05-11 Blower and air conditioning apparatus having the same

Publications (3)

Publication Number Publication Date
EP3619436A1 EP3619436A1 (en) 2020-03-11
EP3619436A4 EP3619436A4 (en) 2020-05-13
EP3619436B1 true EP3619436B1 (en) 2024-01-17

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18797937.2A Active EP3619436B1 (en) 2017-05-12 2018-05-11 Blower and air conditioning apparatus having the same

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