WO2023281994A1 - 送風装置及びそれを備えた空気調和システム - Google Patents
送風装置及びそれを備えた空気調和システム Download PDFInfo
- Publication number
- WO2023281994A1 WO2023281994A1 PCT/JP2022/023822 JP2022023822W WO2023281994A1 WO 2023281994 A1 WO2023281994 A1 WO 2023281994A1 JP 2022023822 W JP2022023822 W JP 2022023822W WO 2023281994 A1 WO2023281994 A1 WO 2023281994A1
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- WIPO (PCT)
- Prior art keywords
- blade
- blower device
- fixed
- outer peripheral
- blower
- Prior art date
Links
- 238000004378 air conditioning Methods 0.000 title claims description 9
- 238000007664 blowing Methods 0.000 title 1
- 230000002093 peripheral effect Effects 0.000 claims abstract description 91
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 57
- 238000009434 installation Methods 0.000 claims abstract description 38
- 230000007423 decrease Effects 0.000 claims description 5
- 230000000052 comparative effect Effects 0.000 description 13
- 230000003068 static effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
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
- F04D19/00—Axial-flow pumps
- F04D19/007—Axial-flow pumps multistage 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
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using 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
- F04D19/00—Axial-flow pumps
- F04D19/002—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
- 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
- F04D29/26—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
- F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud
-
- 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
-
- 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
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/542—Bladed diffusers
-
- 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
- F04D29/542—Bladed diffusers
- F04D29/544—Blade shapes
-
- 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
- F05D2240/10—Stators
- F05D2240/12—Fluid guiding means, e.g. vanes
- F05D2240/121—Fluid guiding means, e.g. vanes related to the leading edge of a stator vane
-
- 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
- F05D2240/10—Stators
- F05D2240/12—Fluid guiding means, e.g. vanes
- F05D2240/122—Fluid guiding means, e.g. vanes related to the trailing edge of a stator vane
-
- 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
- F05D2250/00—Geometry
- F05D2250/10—Two-dimensional
- F05D2250/18—Two-dimensional patterned
- F05D2250/182—Two-dimensional patterned crenellated, notched
Definitions
- the present disclosure relates to a blower including a stationary blade having a plurality of fixed blades and a rotor blade having a plurality of rotating blades and arranged upstream of the stationary blade, and an air conditioning system including the same.
- Patent Document 1 discloses a stationary vane having a stationary hub, a plurality of stationary vanes protruding radially outward from the stationary hub at intervals in the circumferential direction, and a plurality of rotating vanes, and a rotor blade disposed upstream of the stator vane.
- this blower the main flow of air discharged from the moving blades is concentrated on the outer peripheral side of the rotating blades relative to the radially central portion.
- the mounting angle of the fixed blade at the outer peripheral end of the fixed blade is set to be smaller than the mounting angle of the fixed blade at the central portion in the radial direction of the fixed blade. , the collision loss at the outer peripheral end of the fixed blade is suppressed.
- Patent Document 1 since the mounting angle of the fixed blade is small on the inner peripheral side of the center portion of the fixed blade in the radial direction, the air easily swirls along the fixed blade. Therefore, the swirl of the air on the inner peripheral side of the radially central portion of the fixed blade cannot be suppressed so much.
- An object of the present disclosure is to effectively suppress swirl of air on the inner peripheral side of the radial center of the fixed blade.
- a first aspect of the present disclosure has a stationary hub (19) and a plurality of stationary vanes (20) projecting radially outward from the stationary hub (19) at intervals in the circumferential direction.
- An air blower comprising a stationary blade (18) and a rotor blade (30) having a plurality of rotating blades (32) and arranged upstream of the stationary blade (18), wherein the stationary blade ( 20), the chord line (CHL) of 20) is inclined downstream in the direction of rotation of the rotor blade (30) over the entire radial direction, and extends from the outer peripheral end of the upstream edge of the fixed blade (20) Installation angle formed by the chord line (CHL) of the stationary blade (20) on the outer peripheral side of the midpoint of the straight line extending radially to the outer peripheral surface of the stationary hub (20) with respect to the plane perpendicular to the axis of rotation (AX)
- the average value of ( ⁇ ) is smaller than the average value of the installation angle ( ⁇ ) on the inner peripheral side of the midpoint of the fixed
- the installation angle ( ⁇ ) on the inner peripheral side of the midpoint of a straight line extending radially from the outer peripheral end of the upstream edge of the stationary blade (20) to the outer peripheral surface of the stationary hub (19) is larger than the average value of the installation angles ( ⁇ ) on the outer peripheral side of the midpoint, the air is effectively swirled on the inner peripheral side of the midpoint of the fixed blade (20). can be suppressed to
- a second aspect of the present disclosure is characterized in that, in the first aspect, the installation angle ( ⁇ ) gradually decreases from the inner peripheral side to the outer peripheral side of the fixed blade (20). .
- the installation angle ( ⁇ ) at the inner peripheral end of the upstream edge of the fixed blade (20) is the largest, the air is effectively swirled around the inner peripheral end of the fixed blade (20). can be suppressed to
- the installation angle ( ⁇ ) at the inner peripheral end of the upstream edge of the fixed blade (20) is It is characterized by being 14 degrees or more larger than the setting angle ( ⁇ ) at the outer peripheral end of the side edge.
- the installation angle ( ⁇ ) at the inner peripheral end of the upstream edge of the fixed blade (20) is 14 degrees greater than the installation angle ( ⁇ ) at the outer peripheral end of the upstream edge of the fixed blade (20).
- the average swirl speed of the air blown out from the stator vane (18) on the downstream side of the stator vane (18) can be reduced as compared with the case where the angle is increased by less than a degree.
- the center line (CL) extending at the center in the thickness direction of the fixed blade (20) is the downstream end , the angle formed with the rotation axis (AX) is constant throughout the radial direction.
- the direction of the air blown out from the stator vane (18) can be made uniform over the entire circumferential direction of the stator vane (18).
- a fifth aspect of the present disclosure is characterized in that, in any one of the first to fourth aspects, an annular shroud (13) is connected to an outer peripheral end of the fixed blade (20). do.
- the shroud (13) suppresses the flow of air to the outer peripheral side of the stationary blade (18), so the occurrence of short circuit can be suppressed.
- the shroud (13) has an inner peripheral surface at the downstream end portion thereof formed with an inclined surface (14a) inclined toward the outer peripheral side toward the downstream side. It is characterized by
- the flow path of the air passing through the inside of the shroud (13) widens toward the outer peripheral side toward the downstream side, so the speed of the air flowing through the outer peripheral end of the stationary blade (18) can be reduced. Therefore, it is possible to suppress a decrease in efficiency and an increase in noise due to interference between the fixed blades (20) at the outer peripheral end of the stationary blade (18) and the air.
- a seventh aspect of the present disclosure is characterized in that, in any one of the first to sixth aspects, the numbers of the fixed vanes (20) and the numbers of the rotary vanes (32) are relatively prime.
- the tip vortex of the fixed blade (20) and the tip vortex of the rotating blade (32) are less likely to interfere with each other, so noise can be reduced.
- An eighth aspect of the present disclosure is characterized in that, in any one of the first to seventh aspects, a ring (33) is connected to the outer peripheral end of the rotating blade (32).
- generation of tip vortices in the rotor blade (32) can be suppressed, so that abnormal noise can be reduced.
- a ninth aspect of the present disclosure is any one of the first to eighth aspects, further comprising a motor (40) for rotating the moving blades (30), wherein the motor (40) rotates the fixed hub (19) is attached to the
- the mounting member for the motor (40) does not have to be provided separately from the stationary blade (18), so space can be saved.
- a tenth aspect of the present disclosure is characterized in that, in any one of the first to ninth aspects, serrations (21) are formed on the upstream edge of the fixed blade (20). do.
- An eleventh aspect of the present disclosure is an air conditioning system comprising the air blower (5) of any one of the first to tenth aspects.
- FIG. 1 is a block diagram showing the configuration of an air conditioning system.
- FIG. 2 is a perspective view of the chiller device.
- FIG. 3 is a perspective view of the air blower according to Embodiment 1.
- FIG. 4 is a plan view of the blower.
- FIG. 5 is a meridional cross-sectional view of the blower.
- FIG. 6 is a perspective view around the fixed hub with the upper surface portion of the fixed hub removed.
- 7 is a cross-sectional view taken along line VII-VII of FIG. 4.
- FIG. FIG. 8 is a graph showing the relationship between the ratio of the radial distance from the fixed hub to the radial length of the upstream edge of the fixed blade and the installation angle.
- FIG. 8 is a graph showing the relationship between the ratio of the radial distance from the fixed hub to the radial length of the upstream edge of the fixed blade and the installation angle.
- FIG. 9 shows the ratio of the radial distance from the fixed hub to the radial length of the upstream edge of the fixed blade, and the centerline extending in the thickness direction center of the fixed blade forms the rotation axis at the downstream end. It is a graph which shows the relationship with an angle.
- FIG. 10 is a perspective view of a rotor blade.
- FIG. 11A is a velocity distribution map of air around fixed blades.
- FIG. 11B is a view corresponding to FIG. 11A when the installation angle of the outer peripheral portion of the fixed blade is made smaller than in FIG. 11A.
- FIG. 12 is a view corresponding to FIG. 3 of a comparative example.
- FIG. 11A is a velocity distribution map of air around fixed blades.
- FIG. 11B is a view corresponding to FIG. 11A when the installation angle of the outer peripheral portion of the fixed blade is made smaller than in FIG. 11A.
- FIG. 12 is a view corresponding to FIG. 3 of a comparative example.
- FIG. 13 is a graph showing the relationship between the ratio of the radial distance from the fixed hub to the radial length of the upstream edge of the fixed blade and the installation angle in the first embodiment and the comparative example.
- FIG. 14 is a graph showing the relationship between the ratio of the radial distance from the fixed hub to the radial length of the upstream edge of the fixed blade and the swirl speed in the first embodiment and the comparative example.
- FIG. 15 is a graph showing the relationship between the difference obtained by subtracting the installation angle at the outer peripheral end of the upstream edge of the fixed blade from the installation angle at the inner peripheral end of the upstream edge of the fixed blade, and the average turning speed. .
- FIG. 16 shows the relationship between the difference obtained by subtracting the installation angle at the outer peripheral end of the upstream edge of the fixed blade from the installation angle at the inner peripheral end of the upstream edge of the fixed blade, and the static pressure efficiency of the blower.
- FIG. FIG. 10 is a view equivalent to FIG. 10 of another embodiment;
- Figure 1 shows an air conditioning system (1).
- This air conditioning system (1) uses a chiller device (2) that adjusts the temperature of the heat medium and the heat medium whose temperature is adjusted by the chiller device (2) to adjust the temperature of the air and supply it to the room. and an air conditioner (3).
- the air conditioner (3) has, for example, an air handling unit and a fan coil unit.
- the chiller device (2) has a pair of rectangular heat exchangers (4a, 4b) in plan view.
- the heat exchangers (4a, 4b) are arranged to have a substantially V-shaped cross section with their longitudinal directions directed horizontally and facing each other and open upward.
- a rectangular metal top panel (11) with its plate surface facing up and down is arranged to cover the heat exchangers (4a, 4b) from above. It is A pair of circular air outlets (12) are formed in the top panel (11) at intervals in the longitudinal direction of the heat exchangers (4a, 4b).
- a blower device (5) according to Embodiment 1 of the present invention which is also shown in FIGS.
- Each blower (5) has a stationary vane (18) fixed to the top panel (11), and is provided below the stationary vane (18) so as to be rotatable around a rotation axis (AX) extending in the vertical direction. and a motor (40), shown only in FIG. ing.
- AX rotation axis
- FIG. 5 the arrow X indicates the air transport direction. Therefore, the upper side is the downstream side and the lower side is the upstream side. Also, the rotating direction of the moving blade (30) is the counterclockwise direction when viewed from above.
- Each blower (5) is covered from above with a blower grille (41) shown only in FIG.
- the stationary vane (18) comprises a stationary hub (19) and eleven stationary vanes (20) projecting radially outward from the stationary hub (19) at intervals in the circumferential direction. , and a shroud (13) connected to the outer peripheral edge of the fixed vane (20).
- the fixed hub (19) includes a cylindrical tubular portion (19a) whose axial direction is oriented vertically, a circular upper surface portion (19b) that closes the upper end of the tubular portion (19a), and the upper surface portion (19b). is integrally formed with an annular lower surface portion (19c) (shown only in FIG. 6) protruding inward from the lower edge of the cylindrical portion (19a) so as to face the cylindrical portion (19a).
- a mounting hole (not shown) for mounting a motor is formed inside the lower surface portion (19c). Then, as shown in FIG. 6, the motor (40) is attached to the lower surface portion (19c). A portion of the motor (40) other than the rotating shaft is accommodated inside the cylindrical portion (19a), and the rotating shaft of the motor (40) is inserted through the mounting hole of the lower surface portion (19c).
- Each fixed blade (20) is formed in a long plate shape and integrally protrudes from the outer peripheral surface of the cylindrical portion (19a) of the fixed hub (19). As shown in FIG. 7, the chord line (CHL) of each fixed blade (20) is inclined downstream in the direction of rotation of the rotor blade (30) over the entire radial direction. In FIG. 7, arrow Y indicates the direction of rotation of the rotor blade (30).
- FIG. 8 shows the relationship between the ratio of the radial distance from the fixed hub (19) to the radial length of the upstream edge of the fixed blade (20) and the installation angle ( ⁇ ).
- the horizontal axis represents the radial length of the upstream edge of the stationary blade (20) (intersection point (Q) between the upstream edge of the stationary blade (20) and the inner peripheral surface of the shroud (13) and R is the radial distance from the fixed hub (19) and r is the radial distance from the fixed hub (19).
- chord line (CHL) of each fixed blade (20) with respect to the plane perpendicular to the axis of rotation (AX) is gradually decreases towards Therefore, the chord line ( CHL) with respect to a plane perpendicular to the axis of rotation (AX) is the average value of the installation angles ( ⁇ ) on the inner peripheral side of the midpoint of the fixed blade (20). is smaller than
- the installation angle ( ⁇ ) at the inner peripheral end of the upstream edge of the fixed blade (20) is set to be 14 degrees or more larger than the installation angle ( ⁇ ) at the outer peripheral end of the upstream edge of the fixed blade (20).
- the angle ( ⁇ ) formed by the center line (CL) extending at the center in the thickness direction of the stationary blade (20) and the rotation axis (AX) at the downstream end thereof is as follows, as shown in FIG. It is constant over the entire radial direction.
- the angle ( ⁇ ) is the angle that the tangent line of the center line (CL) forms with the rotation axis (AX) at its downstream end.
- the shroud (13) is formed with a substantially constant thickness over the entire circumferential direction and the rotation axis (AX) direction.
- the shroud (13) has a downstream end (base end) formed along the entire circumference with a shroud inclined portion (14) inclined outward toward the downstream side.
- the shroud slant portion (14) includes a tapered upstream slant portion (15) and a smaller slant than the upstream slant portion (15) with respect to the rotation axis (AX) direction of the rotor blade (30), and a tapered downstream inclined portion (16) formed downstream of the upstream inclined portion (15).
- An inner peripheral surface of the shroud sloped portion (14) forms a shroud sloped surface (14a) that slopes outward toward the downstream side.
- An upstream inclined surface (15a) formed by the inner peripheral surface of the upstream inclined portion (15) is formed at the upstream end of the shroud inclined surface (14a).
- 15a) a downstream sloped surface (16a) is formed by the inner peripheral surface of the downstream sloped portion (16).
- the upstream sloped portion (15), the upstream sloped surface (15a), the downstream sloped portion (16), and the downstream sloped surface (16a) are each linear in cross section in the radial direction.
- the outer peripheral end of the fixed blade (20) is connected to the upper end of the upstream inclined portion (15) and the lower end of the downstream inclined portion (16) of the shroud (13).
- the moving blade (30) is provided upstream (below) of the stationary blade (18) so as to be rotatable around a vertically extending rotating shaft (AX).
- the moving blade (30), as shown in FIG. 10, includes a rotating hub (31), four rotating blades (32), and a ring (33).
- the rotating hub (31) is formed in a cylindrical shape, and a portion corresponding to the central axis thereof is connected to the rotating shaft of the motor (40).
- each rotary vane (32) radially protrude radially outward from the rotary hub (31) at intervals in the circumferential direction.
- each rotary vane (32) is slanted toward the upstream side (downward) in the counterclockwise direction when viewed from above over the entire radial direction. That is, each rotor blade (32) is inclined upstream in the rotational direction (the direction indicated by arrow Y) over the entire radial direction. Therefore, when the rotating vane (32) rotates counterclockwise, the air is conveyed from the lower side to the upper side.
- the ring (33) is formed in a substantially tubular shape and is connected to the outer peripheral end of the rotary vane (32) so as to surround the rotary vane (32) and the rotary hub (31) from the outer peripheral side.
- the ring (33) is formed with a substantially constant thickness over the entire circumferential direction and the rotation axis (A) direction.
- a ring inclined portion (34) inclined toward the outer periphery toward the downstream side is formed along the entire circumference of the downstream end portion of the ring (33).
- the outer peripheral surface of the ring sloped portion (34) forms a ring sloped surface (34a) that slopes outward toward the downstream side. That is, a ring inclined surface (34a), which is inclined toward the outer peripheral side toward the downstream side, is formed over the entire circumference of the outer peripheral surface of the downstream end portion of the ring (33).
- a protruding portion (35) that protrudes to the outer peripheral side is formed along the entire circumference of the upstream end portion of the ring (33).
- a portion of the ring (33) excluding the ring slant portion (34) and the projection (35), that is, the portion upstream of the ring slant portion (34) and downstream of the projection (35) is cylindrical. form a ring tubular portion (36).
- the outer peripheral end of the rotary vane (32) is connected to the ring tubular portion (36).
- the rotating hub (31) and rotating blades (32) of the rotor blade (30) configured as described above are arranged entirely inside the shroud (13).
- a portion of the rotor blade (30) excluding the lower end of the ring (33) is disposed inside the shroud (13), and the lower end of the ring tubular portion (36) of the ring (33) and the projecting portion (35) are disposed inside the shroud (13). ) is located below the lower end of the shroud (13).
- the average value of the installation angle ( ⁇ ) on the inner peripheral side of the midpoint of a straight line extending radially from the outer peripheral end of the upstream edge of the fixed blade (20) to the outer peripheral surface of the fixed hub (19). is larger than the average value of the installation angles ( ⁇ ) on the outer peripheral side of the midpoint, so that the swirl of the air is effectively suppressed on the inner peripheral side of the midpoint of the stationary blade (20).
- the angle ( ⁇ ) formed by the center line (CL) extending at the center in the thickness direction of the stationary blade (20) and the rotation axis (AX) at the downstream end thereof is kept constant throughout the radial direction. Therefore, the direction of the air blown out from the stationary blade (18) tends to be uniform over the entire circumferential direction of the stationary blade (18).
- shroud (13) suppresses the flow of air to the outer peripheral side of the stationary blade (18), suppressing the occurrence of short circuit.
- the shroud slanted surface (14a) sloping toward the outer periphery toward the downstream side is formed on the inner peripheral surface of the downstream end of the shroud (13), the air passing through the inside of the shroud (13) flow path spreads toward the outer peripheral side toward the downstream side, and the speed of the air flowing through the outer peripheral end of the stationary blade (18) is reduced. Therefore, it is possible to suppress a decrease in efficiency and an increase in noise due to interference between the fixed blades (20) at the outer peripheral end of the stationary blade (18) and the air.
- the tip vortices of the fixed blades (20) and the rotary blades (32) are less likely to interfere with each other, resulting in noise. is reduced.
- the ring (33) is connected to the outer peripheral end of the rotor blade (32), the generation of the tip vortex of the rotor blade (32) is suppressed, and the noise is reduced.
- FIG. 11A shows the velocity distribution of air around the fixed blade (20), and FIG. 11B is equivalent to FIG. 11A when the installation angle ( ⁇ ) at the outer peripheral portion of the fixed blade (20) is made smaller than in FIG. 11A. It is a diagram.
- FIG. 12 shows a blower device (5) according to a comparative example.
- the installation angle ( ⁇ ) of the fixed blades (20) is different from that of the first embodiment, but the rest of the configuration is the same as that of the first embodiment.
- FIG. 13 shows the installation angle ( ⁇ ) of the fixed blade (20) in Embodiment 1 and Comparative Example.
- the average value of the installation angle ( ⁇ ) on the outer peripheral side of the midpoint of the straight line extending radially from the outer peripheral edge of the upstream edge of the fixed blade (20) to the outer peripheral surface of the fixed hub (19) is larger than the average value of the installation angle ( ⁇ ) on the inner peripheral side of the midpoint of the fixed blade (20).
- FIG. 14 shows the swirling speed (circumferential speed of air) at each position in the radial direction calculated based on the measurement results of the measurement surface arranged on the downstream side of the stationary blade (18) in the first embodiment and the comparative example. show.
- the turning speed on the fixed hub (19) side is lower than in the comparative example.
- the average turning speed in the entire radial direction is 3.02 m/s in the first embodiment and 3.18 m/s in the comparative example, which are lower in the first embodiment than in the comparative example.
- FIG. 15 shows the difference ( ⁇ ) and the average turning speed in the entire radial direction.
- FIG. 16 shows the relationship between the difference ( ⁇ ) and the static pressure efficiency of the blower (5).
- the dashed line indicates the static pressure efficiency in the comparative example.
- the difference ( ⁇ ) is set to 14 degrees or more, that is, the installation angle ( ⁇ ) at the inner peripheral end of the upstream edge of the fixed blade (20) is adjusted to the upstream edge of the fixed blade (20).
- FIG. 17 shows a blower (5) according to Embodiment 2 of the present invention.
- serrations (21) are formed along the entire length of the upstream edge of each fixed blade (20). That is, sawtooth grooves are formed at equal intervals along the entire length of the upstream edge of each fixed blade (20).
- Embodiments 1 and 2 the present invention is applied when the rotor blade (30) is provided with the ring (33). It can also be applied when (33) is not provided.
- the shroud slant surface (14a) and the ring slant surface (34a) are formed by straight surfaces in the cross section in the radial direction. It can be configured in a plane.
- the present invention is applied to the blower device (5) that blows air upward, but the present invention is also applicable to the blower device that blows air downward and the rotating shaft (AX ) in the horizontal direction, that is, a blower that blows air in the horizontal direction.
- the stationary blade (18) is provided with 11 fixed blades (20), but a plurality of fixed blades (20) other than 11 may be provided.
- the rotor blade (30) is provided with four rotor blades (32), but a plurality of rotor blades (32) other than four may be provided.
- the present disclosure is useful for air blowers and air conditioning systems including the same.
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- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
図1は、空気調和システム(1)を示す。この空気調和システム(1)は、熱媒体の温度を調整するチラー装置(2)と、チラー装置(2)によって温度が調整された熱媒体を用いて、空気の温度を調節して部屋へ供給する空気調和機(3)とを備えている。空気調和機(3)は、例えば、エアハンドリングユニット及びファンコイルユニットを備えている。
図17は、本発明の実施形態2に係る送風装置(5)を示す。本実施形態2では、各固定羽根(20)の上流側端縁に、全長に亘ってセレーション(21)が形成されている。つまり、各固定羽根(20)の上流側端縁に、全長に亘って鋸歯状の溝が等間隔で形成されている。
なお、上記実施形態1,2では、動翼(30)にリング(33)を設けた場合に本発明を適用したが、図18に示すように、本発明は、動翼(30)にリング(33)を設けない場合にも適用できる。
5 送風装置
13 シュラウド
14a シュラウド傾斜面
18 静翼
19 固定ハブ
20 固定羽根
21 セレーション
30 動翼
32 回転羽根
33 リング
40 モータ
CHL 翼弦線
AX 回転軸
θ 設置角
CL 中心線
Claims (11)
- 固定ハブ(19)、及び前記固定ハブ(19)から周方向に互いに間隔を空けて径方向外側に向けて突設された複数の固定羽根(20)を有する静翼(18)と、
複数の回転羽根(32)を有し、前記静翼(18)の上流側に配置された動翼(30)とを備えた送風装置であって、
前記固定羽根(20)の翼弦線(CHL)は、径方向全体に亘って前記動翼(30)の回転方向に向かって下流側に傾斜し、
前記固定羽根(20)の上流側端縁の外周端から固定ハブ(19)の外周面に至るまで径方向に延びる直線の中点よりも外周側における前記固定羽根(20)の翼弦線(CHL)が回転軸(AX)に垂直な面に対してなす設置角(θ)の平均値は、前記固定羽根(20)の前記中点よりも内周側における前記設置角(θ)の平均値よりも小さく、
前記回転羽根(32)の翼弦線(CHL)は、径方向全体に亘って前記回転方向に向かって上流側に傾斜していることを特徴とする送風装置。 - 請求項1に記載の送風装置において、
前記設置角(θ)は、前記固定羽根(20)の内周側から外周側に向かって徐々に減少していることを特徴とする送風装置。 - 請求項1又は2に記載の送風装置において、
前記固定羽根(20)の上流側端縁の内周端における前記設置角(θ)は、前記固定羽根(20)の上流側端縁の外周端における前記設置角(θ)よりも14度以上大きいことを特徴とする送風装置。 - 請求項1~3のいずれか1項に記載の送風装置において、
周方向断面において、前記固定羽根(20)の厚さ方向中央で延びる中心線(CL)がその下流端において前記回転軸(AX)となす角度(φ)は、径方向全体に亘って一定であることを特徴とする送風装置。 - 請求項1~4のいずれか1項に記載の送風装置において、
前記固定羽根(20)の外周端には、環状のシュラウド(13)が接続されていることを特徴とする送風装置。 - 請求項5に記載の送風装置において、
前記シュラウド(13)の下流側端部の内周面には、下流側に向けて外周側に傾斜する傾斜面(14a)が形成されていることを特徴とする送風装置。 - 請求項1~6のいずれか1項に記載の送風装置において、
前記固定羽根(20)及び前記回転羽根(32)の枚数は、互いに素であることを特徴とする送風装置。 - 請求項1~7のいずれか1項に記載の送風装置において、
前記回転羽根(32)の外周端には、リング(33)が接続されていることを特徴とする送風装置。 - 請求項1~8のいずれか1項に記載の送風装置において、
前記動翼(30)を回転させるモータ(40)をさらに備え、
前記モータ(40)は、前記固定ハブ(19)に取り付けられていることを特徴とする送風装置。 - 請求項1~9のいずれか1項に記載の送風装置において、
前記固定羽根(20)の上流側端縁には、セレーション(21)が形成されていることを特徴とする送風装置。 - 請求項1~10のいずれか1項に記載の送風装置(5)を備えた空気調和システム。
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EP22837412.0A EP4357622A4 (en) | 2021-07-05 | 2022-06-14 | AIR BLOWING DEVICE AND AIR CONDITIONING SYSTEM COMPRISING SAME |
CN202280046353.8A CN117581026A (zh) | 2021-07-05 | 2022-06-14 | 送风装置及包括该送风装置的空调系统 |
US18/404,445 US20240183358A1 (en) | 2021-07-05 | 2024-01-04 | Air blowing device and air conditioning system including same |
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- 2022-06-14 CN CN202280046353.8A patent/CN117581026A/zh active Pending
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JP2023008054A (ja) | 2023-01-19 |
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