WO2017145275A1 - 送風機及びそれを用いた空気調和機 - Google Patents
送風機及びそれを用いた空気調和機 Download PDFInfo
- Publication number
- WO2017145275A1 WO2017145275A1 PCT/JP2016/055347 JP2016055347W WO2017145275A1 WO 2017145275 A1 WO2017145275 A1 WO 2017145275A1 JP 2016055347 W JP2016055347 W JP 2016055347W WO 2017145275 A1 WO2017145275 A1 WO 2017145275A1
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- WIPO (PCT)
- Prior art keywords
- blade
- peripheral edge
- downstream
- blower according
- upstream
- Prior art date
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Classifications
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- 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
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- 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
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- 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
- F04D29/386—Skewed 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
- F04D29/388—Blades characterised by construction
-
- 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
- F04D29/545—Ducts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
-
- 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
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
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- 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
- F05B2240/301—Cross-section characteristics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
- F25D17/067—Evaporator fan units
Definitions
- the present invention relates to a blower provided with a propeller fan and an air conditioner using the blower.
- Patent Document 1 a blower that suppresses the turbulence of the suction flow by providing an S-shaped enlarged portion on the upstream side of the bell mouth as means for reducing power consumption for driving the fan and noise during blowing.
- Patent Document 2 proposes means for enlarging the downstream portion of the bell mouth in the radial direction to increase the efficiency of the blower.
- Patent Document 3 an outdoor unit of an air conditioner has been proposed in which a cover that prevents a hand from touching a rotating wing is attached to the blowing side.
- JP 2011-185236 A Japanese Patent Laying-Open No. 2015-81691 JP 2003-130396 A
- the normal direction of the blade surface is inward in the radial direction from the middle portion of the chord to the trailing edge, and suction is stronger from the side surface of the blade.
- the bell mouth surrounding the wing is composed of a duct portion having a minimum inner diameter and an inlet portion having a long distance between the bell mouth and the outer peripheral edge of the wing, and a region where the side suction is strong spans two regions of the bell mouth.
- a cover is provided on the blowout side so as not to touch the rotating wings.
- the cover whose blowing direction is vertically upward needs to make the mesh finer or thicken the cross that constitutes the guard in order to prevent the strength against falling of an object from outside and snowfall from accumulating in the bell mouth.
- the airflow blown out from the fan is biased outward due to centrifugal force, increasing the airflow resistance of the airflow passing through the mesh and increasing the loss.
- the present invention has been made to solve the above-described problems, and reduces noise and increases efficiency by reducing the loss of inflow to the side of the fan and suppressing the loss of airflow that passes through the guard of the bell mouth.
- An object of the present invention is to provide a blower capable of realizing a large air volume and an air conditioner using the same.
- a blower according to the present invention includes a propeller fan in which a plurality of wings are attached around a boss attached to a rotating shaft, and a bell mouth surrounding an outer peripheral edge of the propeller fan, and the bell mouth includes the propeller.
- a cylindrical duct portion that surrounds the outer periphery of the fan, and an inlet portion that is provided upstream of the duct portion and that reduces the passage area of the wind from upstream to downstream, and the blades rotate the rotation
- the upstream end of the blade outer periphery is upstream than the upstream end of the blade inner periphery
- the downstream end of the blade outer periphery is downstream of the downstream end of the blade inner periphery.
- the blower according to the present invention since the airflow is inward, the loss of the inflow of the fan side surface is reduced, and the loss of the airflow passing through the bell mouth guard is suppressed, thereby reducing noise and improving efficiency. Also, a large air volume can be realized.
- FIG. 3 is a radial cross section (AA cross section) including the rotation axis of FIG. 2. It is explanatory drawing for demonstrating the line segment L shown in FIG. It is explanatory drawing for demonstrating the line segment L shown in FIG. It is sectional drawing of the blade
- FIG. 1 is a perspective view showing an example of a configuration of a propeller fan 1 used in a blower according to Embodiment 1 of the present invention.
- the propeller fan 1 will be described with reference to FIG.
- the rotation direction of the propeller fan 1 is represented by the rotation direction 5
- the airflow direction is represented by the airflow direction 10.
- the propeller fan 1 has a cylindrical boss 2 provided in the center and a plurality of blades 3 attached around the boss 2.
- the boss 2 is connected to a shaft (rotary shaft 13) of a driving device such as a motor (not shown).
- FIG. 1 shows an example in which four blades 3 are attached to the boss 2.
- the blade 3 includes a front edge 6 facing the rotation direction 5, a rear edge 7 facing the front edge 6, an end on the outer peripheral side of the blade (outer peripheral end 8), and an end on the inner peripheral side of the blade 3. It is comprised so that it may be enclosed by the inner peripheral end 9 connected with.
- a side facing the downstream side of the blade surface with respect to the air flow direction 10 is called a pressure surface 11, and a side facing the upstream side is called a negative pressure surface 12.
- FIG. 2 is a top view of the propeller fan 1.
- 3 is a radial cross section (AA cross section) including the rotary shaft 13 of FIG.
- FIG. 3 is a view (rotated projection view) showing a locus appearing in the AA section when the propeller fan 1 is rotated with respect to the blade 3.
- the propeller fan 1 will be described in more detail based on FIG. 2 and FIG.
- the locus made by the outer peripheral edge 8 of the propeller fan 1 in the cross section is called an outer peripheral edge 14, and the locus made by the inner peripheral end 9 in the cross section is called an inner peripheral edge 15.
- a bell mouth 16 surrounding the wing 3 is installed outside the outer peripheral edge 14 of the propeller fan 1.
- the bell mouth 16 includes three parts, a duct part 18, an outlet part 20, and an inlet part 19.
- the trajectory of the outer peripheral edge 14 formed by the rotation of the wing 3 is generally cylindrical.
- the duct portion 18 is a cylindrical portion that surrounds and closes to the cylindrical locus.
- the inlet portion 19 is a portion that is located on the upstream side of the duct portion 18 and has a reduced ventilation area from upstream to downstream.
- FIG. 2 shows an example in which the cross-sectional shape is a curved surface, but there may be a portion that is partially reduced to a straight line. Also, the phenomenon shown in this patent is not affected even if the area is not continuously reduced.
- the outlet part 20 is located on the downstream side of the duct part 18 and is a part where the area of the air passage is enlarged toward the downstream.
- FIG. 2 shows an example in which the cross section is formed in a tapered shape that linearly expands, but it may be formed with a smooth curved surface in the same manner as the inlet portion 19. In addition, the phenomenon shown in this patent is not affected even if the area does not continuously expand.
- the duct portion 18 has a function of ensuring a pressure difference between the upstream side and the downstream side where the blades 3 are pressurized, so that the size of the gap is generally larger than 0% of the fan diameter and about 3% so that the wind does not leak. Is set.
- the duct portion 18 is formed of a cylinder having a substantially constant inner diameter. In the case of manufacturing with resin, in order to remove the mold after molding, a draft of several percent is given in the drawing direction, and the inner diameter changes in the direction of the rotation axis.
- the distance between the outer peripheral edge 14 of the wing 3 and the bell mouth 16 is the smallest in the duct portion 18, and the closest point is a point 17. If the boundary between the duct portion 18 and the inlet portion 19 is P and the boundary between the duct portion 18 and the outlet portion 20 is Q in the bellmouth cross section, the point 17 is located anywhere between P to Q in the figure. Good.
- a line segment connecting the upstream end of the inner peripheral edge 15 of the blade 3 and the upstream end of the outer peripheral edge 14 is L1
- a line segment connecting the upstream end of the inner peripheral edge 15 of the blade 3 and the upstream end of the outer peripheral edge 14 is L2.
- a propeller fan is considered in which a straight line M perpendicular to the rotation shaft 13 is used as a reference line, L1 is inclined downstream with respect to the reference line, and L2 is inclined upstream.
- the point at which the outer peripheral edge 14 of the blade 3 is internally divided between the upstream side and the downstream side is B1
- the inner peripheral edge 15 is internally divided at the same ratio as the outer peripheral edge 14 into the upstream side and the downstream side.
- a point is B2
- a line segment connecting B1 and B2 is L
- an angle formed by L and a straight line M perpendicular to the rotation shaft 13 is ⁇
- an angle ⁇ inclined to the downstream side with respect to the straight line M is positive.
- FIGS. 4 and 5 are explanatory diagrams for explaining the line segment L shown in FIG.
- the line segment L will be described with reference to FIGS.
- a combination of a point B1 that internally divides the outer peripheral edge 14 and a point B2 that internally divides the inner peripheral edge 15 is selected as (B1a, B2a), (B1b, B2b), (B1c, B2c),.
- B1a, B2a a point B1 that internally divides the outer peripheral edge 14
- B1b, B2b a point B2 that internally divides the inner peripheral edge 15
- B1c, B2c an infinite number of La, Lb, Lc... Can be drawn on the cross section.
- the angle ⁇ formed by these line segment L and straight line M is negative on the upstream side L1 of the blade 3, and the downstream end L2 of the blade 3 is positive.
- L0 There exists a line segment L0.
- the point R is in a region surrounded by the duct portion 18 of the bell mouth 16 in the example of the present invention. That is, the formed angle ⁇ changes from negative to positive in the duct portion 18 of the bell mouth 16.
- FIG. 6 is a cross-sectional view of the blade 3 of the propeller fan 1.
- FIG. 6 shows an example of the blade cross-sectional shape when the upstream side and the downstream side are internally divided at the same ratio with respect to each radius of the three-dimensional blade 3.
- FIG. 7 is a schematic diagram for explaining the operation of the blower provided with the propeller fan 1.
- FIG. 8 is a schematic diagram for explaining the operation of a conventional blower.
- FIG. 9 is a schematic diagram for explaining the operation of the blower provided with the propeller fan 1.
- the blades 3 push the airflow downstream, and the wind flows from the upstream.
- a device that drives the propeller fan 1 such as a fan motor
- the blades 3 push the airflow downstream, and the wind flows from the upstream.
- the normal line of the pressure surface 11 of the blade 3 faces radially outward. Is guided radially outward by a radially outward force Fb1. Since the outer peripheral side of the blade 3 has a long distance from the rotating shaft 13 and the moment of the force applied to the airflow is increased, the force for driving the blade 3 can be efficiently applied to the wind. Therefore, noise can be reduced by reducing the power consumption of the propeller fan 1 and by reducing the rotational speed when the required air volume is blown.
- the normal line of the pressure surface 11 of the blade 3 is directed radially inward.
- the wind flowing between the blades increases in swirling speed from upstream to downstream, and a radially outward force is exerted by the centrifugal force Fr.
- the radially inward force Fb is applied from the pressure surface 11, the airflow is caused by the balance between the two. Will not be biased to the outside of the radius compared to the conventional case.
- the wind speed decreases. Since loss is proportional to the logarithm of the wind speed squared and noise is the sixth power of wind speed, energy loss and noise are reduced. Since the wind between the blades is pushed radially inward, a suction flow is generated radially inward at the outer peripheral edge 14.
- a conventional propeller fan 100 shown in FIG. 8 has a cylindrical boss 200 provided in the center and a plurality of blades 300 attached around the cylindrical boss 200.
- the boss 200 is connected to a shaft (rotary shaft 130) of a driving device such as a motor (not shown).
- the vortex generated at the outer peripheral edge causes loss and turbulence, and narrows the flow path of the outer peripheral portion of the blade 300. Therefore, the efficiency of the blade 300 during blowing is reduced, and the number of rotations for blowing the required air volume increases and noise increases. Invite.
- the outer peripheral edge 14 that is strongly sucked radially inward at the outer peripheral edge 14 downstream of the straight line L is accommodated in the duct portion 18 of the bell mouth 16.
- the suction spaces are equalized, the wind speed difference is reduced, and the vortex immediately after flowing in from the outer peripheral edge 14 is suppressed.
- flow loss and turbulence are reduced, and a wide flow path in the outer peripheral portion of the blade can be ensured, so that the blade 3 can be operated with high efficiency and low noise.
- FIG. FIG. 10 is a schematic diagram for explaining the operation of the blower according to Embodiment 2 of the present invention. Based on FIG. 10, the blower according to Embodiment 2 will be described.
- FIG. 10 is a diagram obtained by rotational projection onto a radial section including the rotation shaft 13.
- differences from the first embodiment will be mainly described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.
- the angle ⁇ formed by the straight line L0 connecting the points B10 and B20 that divide the outer peripheral edge 14 and the inner peripheral edge 15 into two equal parts and the straight line M perpendicular to the rotary shaft 13 is positive. It is the value of. Since the angle ⁇ formed by the straight line L0 connecting the outer peripheral edge 14 and the inner peripheral edge 15 of the blade 3 and the straight line M perpendicular to the rotary shaft 13 is positive, the normal direction of the blade 3 is radially inward. The area to become wide.
- the blower according to Embodiment 2 Since the area where the airflow passing between the blades receives the radially inward force is widened, in the blower according to Embodiment 2, the airflow 21a blown out of the blades 3 is made uniform in the radial direction, and loss and noise can be reduced. Further, the blower according to the second embodiment can suppress the airflow that collides with the duct portion 18 because the force inward in the radial direction acts on the airflow 21b flowing through the duct portion 18 more strongly. Disturbances that occur can be suppressed, and loss and noise can be reduced.
- FIG. FIG.11 and FIG.12 is a schematic diagram for demonstrating operation
- FIG. 11 is a diagram obtained by rotational projection onto a radial cross section including the rotation shaft 13.
- differences from the first and second embodiments will be mainly described, and the same parts as those in the first and second embodiments will be denoted by the same reference numerals and the description thereof will be omitted.
- the propeller fan 1B included in the blower according to Embodiment 3 is configured such that the downstream end 14e of the outer peripheral edge 14 of the blade 3 is surrounded by the duct portion 18.
- the airflow passing through the downstream end of the outer peripheral edge 14 of the blade 3 is the place where the energy from the blade 3 is most strongly received, and the airflow velocity is fast.
- FIG. 12 when the downstream end 14e of the outer peripheral edge 14 of the blade 3 is in a position surrounded by the outlet portion 20, the airflow that has passed through the blade 3 attracts air between the blade 3 and the outlet portion 20, and the vortex 22 occurs, causing loss and increased noise.
- the outer peripheral edge 14 of the blade 3 is surrounded by the duct portion 18 so that vortices caused by airflow attraction from the side surface can be reduced. Therefore, according to the air blower concerning Embodiment 3, loss can be made small.
- FIG. 13 is a schematic diagram for explaining the operation of the blower according to Embodiment 4 of the present invention. Based on FIG. 13, a blower according to Embodiment 4 will be described. FIG. 13 is a diagram obtained by rotational projection onto a radial cross section including the rotation shaft 13.
- differences from the first to third embodiments will be mainly described, and the same parts as those in the first to third embodiments will be denoted by the same reference numerals and the description thereof will be omitted.
- the propeller fan 1C provided in the blower according to Embodiment 4 is configured such that the downstream end 14e of the outer peripheral edge 14 of the blade 3 coincides with the downstream end of the duct portion 18. Since the airflow blown out from the downstream end 14e of the blade 3 is high speed, the energy loss due to friction increases when the duct portion 18 extends long downstream. Therefore, in the blower according to the fourth embodiment, the downstream end 14e of the outer peripheral edge 14 and the downstream end of the duct portion 18 are configured to coincide with each other to reduce the friction loss, and the same as the blower according to the third embodiment. It is possible to maintain the effect.
- FIG. 14 is a schematic diagram for explaining the operation of the blower according to Embodiment 5 of the present invention. Based on FIG. 14, the blower according to the fifth embodiment will be described.
- FIG. 14 is a diagram obtained by rotational projection onto a radial section including the rotation shaft 13.
- differences from the first to fourth embodiments will be mainly described, and the same parts as those in the first to fourth embodiments will be denoted by the same reference numerals and description thereof will be omitted.
- the propeller fan 1D included in the blower according to Embodiment 5 has a configuration in which a part of the outer peripheral edge 14 of the wing 3 is surrounded by a duct portion 18 of the bell mouth 16 and the rest is surrounded by an inlet portion 19. According to the blower according to the fifth embodiment, since the pressure boosted by the wing 3 by the bell mouth 16 is maintained, if the entire wing is surrounded, the leakage of wind due to the differential pressure can be reduced, and the loss can be reduced. .
- the blower according to Embodiment 5 can reduce the loss of leakage flow and ensure a large air volume.
- FIG. 15 is a schematic diagram for explaining the operation of the blower according to the sixth embodiment of the present invention. Based on FIG. 15, the blower according to the sixth embodiment will be described.
- FIG. 15 is a diagram obtained by rotational projection onto a radial section including the rotation shaft 13.
- differences from the first to fifth embodiments will be mainly described, and the same parts as those in the first to fifth embodiments will be denoted by the same reference numerals and description thereof will be omitted.
- the propeller fan 1E included in the blower according to Embodiment 6 has a configuration in which the inlet 19 of the bell mouth 16 surrounds the entire outer peripheral edge 14, and the inlet 19 has a curved cross section and gradually increases from upstream to downstream. The cross sectional area is reduced.
- a radially outward force acts on the airflow 21a passing between the blades near the inlet portion 19 of the bell mouth 16, but gradually becomes a radially inward force toward the downstream.
- the air flow direction changes from the radially outward direction to the axial direction.
- the cross-sectional area of the inlet portion 19 of the bell mouth 16 is reduced from the upstream side to the downstream side, so that the air flow 21b flowing from the side surface into the wing 3 changes from the radially inward to the axial direction, and near the duct portion 18.
- the blower according to the sixth embodiment it is possible to reduce turbulence when both flows merge when flowing into the space between the blades from the side surface.
- the case where the inlet 19 has an arc cross section is taken as an example.
- the present invention is not limited to this, and the same effect can be obtained if the cross section decreases in the downstream direction. It is done.
- FIG. 16 to 18 are schematic views for explaining the blower according to the seventh embodiment of the present invention.
- FIG. 17 shows that the angle ⁇ formed by the straight line L0 connecting the points dividing the outer peripheral edge 14 and the inner peripheral edge 15 of the blower according to the seventh embodiment at the same ratio and the straight line M perpendicular to the rotation axis is 0 °.
- the relationship between the position and power consumption is shown.
- FIG. 18 shows that the angle ⁇ formed by the straight line L0 connecting the points dividing the outer peripheral edge 14 and the inner peripheral edge 15 of the blower according to Embodiment 7 at the same ratio and the straight line M perpendicular to the rotation axis is 0 °.
- the relationship between the position and noise is shown.
- a blower according to the seventh embodiment will be described with reference to FIGS.
- differences from the first to sixth embodiments will be mainly described, and the same parts as those in the first to sixth embodiments will be denoted by the same reference numerals and the description thereof will be omitted.
- a point B 1 that internally divides the outer peripheral edge 14 of the blade 3 at the upstream side and the downstream side is connected to a point B 2 that internally divides the inner peripheral edge 15 into the upstream side and the downstream side at the same ratio as the outer peripheral edge 14.
- a line with an angle of 0 ° with the straight line M is defined as L0. Assume that the intersection of L0 and the duct portion 18 is R, and the axial distance between the upstream end of the duct portion 18 and R is a. The axial distance of the duct portion 18 is b.
- the propeller fan 1F included in the blower according to the seventh embodiment specifies the numerical range of a / b.
- the blower according to Embodiment 7 since the numerical range of a / b is specified, a high effect is exhibited in both power consumption and noise.
- FIG. 19 is a perspective view showing a configuration example of a blower according to Embodiment 8 of the present invention. Based on FIG. 19, a blower according to Embodiment 8 will be described.
- differences from the first to seventh embodiments will be mainly described, and the same parts as those in the first to seventh embodiments will be denoted by the same reference numerals and the description thereof will be omitted.
- the propeller fan 1 of the blower according to the first embodiment is applied will be described as an example, but any of the propeller fans of the blower according to the second to seventh embodiments can be applied.
- the blower according to the eighth embodiment has a protective guard 23 attached to the downstream end of the outlet 20 of the bell mouth 16.
- the protective guard 23 is configured by a plurality of vertical and horizontal bars 24 arranged in a lattice pattern. That is, the blower according to the eighth embodiment includes a mesh-like protective guard 23 at the outlet 20 of the bell mouth 16.
- the protective guard 23 is attached to prevent contact between the rotating wing 3 and a human finger or a foreign object.
- a protective guard 23 is provided so as to equalize the blowing air speed.
- FIG. FIG. 20 is a perspective view showing a configuration example of a blower according to Embodiment 9 of the present invention. Based on FIG. 20, the blower according to Embodiment 9 will be described. In the ninth embodiment, differences from the first to eighth embodiments will be mainly described, and the same parts as those in the first to eighth embodiments will be denoted by the same reference numerals and description thereof will be omitted. Here, a case where the propeller fan 1 of the blower according to Embodiment 1 is applied will be described as an example, but any of the propeller fans of the blower according to Embodiments 2 to 8 can be applied.
- the outlet 20 is provided. Therefore, in the blower according to the ninth embodiment, the blown airflow is made uniform in the radial direction, and the wind speed of the wind passing through the narrow bars 24 is reduced. As a result, according to the blower according to the ninth embodiment, it is possible to realize energy saving and noise reduction of the device by reducing the ventilation resistance of the protective guard 23.
- the crosspieces 24 are arranged so that the mesh gap outside the radius is smaller than the inside, the strength of the protective guard 23 is also increased.
- FIG. FIG. 21 is a perspective view showing a configuration example of the outdoor unit 101 of the air conditioner according to Embodiment 10 of the present invention.
- FIG. 22 is a schematic diagram showing a section CC including the rotation shaft 13 of the propeller fan 1 of the outdoor unit 101. Based on FIG.21 and FIG.22, the air conditioner which concerns on Embodiment 10 is demonstrated.
- differences from the first to ninth embodiments will be mainly described, and the same parts as those in the first to ninth embodiments will be denoted by the same reference numerals and the description thereof will be omitted.
- a case where the blower according to Embodiment 1 is applied to the outdoor unit 101 will be described as an example, but any of the blowers according to Embodiments 2 to 9 is applied to the outdoor unit 101. Can do.
- an indoor unit (not shown) and an outdoor unit 101 as shown in FIG. 21 are connected by a refrigerant pipe, and a refrigerant is circulated between the units to constitute a refrigeration cycle.
- the outdoor unit 101 includes a housing 102 and an in-unit device 103 accommodated in the housing 102.
- the indoor unit has a housing and an in-unit device accommodated in the housing.
- Examples of the in-unit equipment 103 include a compressor, a decompressor, and an accumulator.
- Examples of the in-unit equipment of the indoor unit include a heat exchanger and a blower.
- the housing 102 is equipped with a heat exchanger 105 that exchanges heat between the refrigerant and the air.
- the heat exchanger 105 is disposed so as to face the side surface of the housing 102.
- the upper end of the housing 102 is covered with a top plate 106, and a bottom plate 107 is attached to the lower end.
- a bell mouth 16 surrounding the outlet is attached to the top plate 106.
- a protective guard 23 is provided at the downstream end of the bell mouth 16.
- a fan motor 108 for driving the propeller fan 1 is provided on the lower side of the propeller fan.
- the outdoor unit 101 it is preferable to reduce the installation area as much as possible because the degree of freedom of the installation location is increased.
- the unit width may be close to the diameter of the propeller fan.
- the outdoor unit 101 is configured such that the width 110 inside the heat exchanger 105 is smaller than the width 109 of the bell mouth most upstream part. Therefore, in the outdoor unit 101, when the airflow 201 that has passed through the heat exchanger 105 goes to the blower, it flows into the rotating shaft side, and the wind flows into the inner peripheral side of the blower.
- blowers according to Embodiments 1 to 9 since any of the blowers according to Embodiments 1 to 9 is applied to the outdoor unit 101, the airflow can be distributed to the outside, and the blower can be operated in an efficient state. It is like that.
- an air conditioner it can apply to refrigeration apparatuses, such as a showcase, for example, a room air conditioner, a package air conditioner, a building multi air conditioner, a heat pump water heater. Further, if a flow path switching device (for example, a combination of a four-way valve, a two-way valve, or a three-way valve) is provided on the discharge side of the compressor, the heating operation and the cooling operation can be switched.
- a flow path switching device for example, a combination of a four-way valve, a two-way valve, or a three-way valve
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
Description
図1は、本発明の実施の形態1に係る送風機に用いられるプロペラファン1の構成の一例を示す斜視図である。図1に基づいて、プロペラファン1について説明する。なお、図1において、プロペラファン1の回転方向を回転方向5で表し、気流方向を気流方向10で表している。
入口部19は、ダクト部18よりも上流側に位置し、上流から下流に向かい通風面積が縮小する部分である。なお、図2は断面形状が曲面で構成されている状態を例に示しているが、部分的に直線状に縮小する部分があってもよい。また、途中連続して面積縮小しないものについても本特許で示す現象に影響はない。
図10は、本発明の実施の形態2に係る送風機の動作を説明するための模式図である。図10に基づいて、実施の形態2に係る送風機について説明する。この図10は、回転軸13を含む径方向の断面に回転投影した図となっている。なお、実施の形態2では実施の形態1との相違点を中心に説明し、実施の形態1と同一部分には、同一符号を付して説明を省略するものとする。
図11及び図12は、本発明の実施の形態3に係る送風機の動作を説明するための模式図である。図11及び図12に基づいて、実施の形態3に係る送風機について説明する。この図11は、回転軸13を含む径方向の断面に回転投影した図となっている。なお、実施の形態3では実施の形態1、2との相違点を中心に説明し、実施の形態1、2と同一部分には、同一符号を付して説明を省略するものとする。
図13は、本発明の実施の形態4に係る送風機の動作を説明するための模式図である。図13に基づいて、実施の形態4に係る送風機について説明する。この図13は、回転軸13を含む径方向の断面に回転投影した図となっている。なお、実施の形態4では実施の形態1~3との相違点を中心に説明し、実施の形態1~3と同一部分には、同一符号を付して説明を省略するものとする。
図14は、本発明の実施の形態5に係る送風機の動作を説明するための模式図である。図14に基づいて、実施の形態5に係る送風機について説明する。この図14は、回転軸13を含む径方向の断面に回転投影した図となっている。なお、実施の形態5では実施の形態1~4との相違点を中心に説明し、実施の形態1~4と同一部分には、同一符号を付して説明を省略するものとする。
図15は、本発明の実施の形態6に係る送風機の動作を説明するための模式図である。図15に基づいて、実施の形態6に係る送風機について説明する。この図15は、回転軸13を含む径方向の断面に回転投影した図となっている。なお、実施の形態6では実施の形態1~5との相違点を中心に説明し、実施の形態1~5と同一部分には、同一符号を付して説明を省略するものとする。
図16~図18は、本発明の実施の形態7に係る送風機を説明するための模式図である。図17は、実施の形態7に係る送風機の外周縁14と内周縁15とを同比で内分する点を結んだ直線L0と回転軸に垂直な直線線Mとがなす角度θが0°になる位置と消費電力との関係を示している。図18は、実施の形態7に係る送風機の外周縁14と内周縁15とを同比で内分する点を結んだ直線L0と回転軸に垂直な直線線Mとがなす角度θが0°になる位置と騒音との関係を示している。図16~図18に基づいて、実施の形態7に係る送風機について説明する。なお、実施の形態7では実施の形態1~6との相違点を中心に説明し、実施の形態1~6と同一部分には、同一符号を付して説明を省略するものとする。
a/bが0.3以上になると、翼面の法線方向が外向きになる領域がダクト部18と重なるため、気流がベルマウス16に衝突して乱れを発生させ損失が大きくなり、特性が悪化すると考えられる。
なお、図18に示す騒音差についても同様のことが言える。
図19は、本発明の実施の形態8に係る送風機の構成例を示す斜視図である。図19に基づいて、実施の形態8に係る送風機について説明する。なお、実施の形態8では実施の形態1~7との相違点を中心に説明し、実施の形態1~7と同一部分には、同一符号を付して説明を省略するものとする。ここでは、実施の形態1に係る送風機のプロペラファン1が適用されている場合を例に説明するが、実施の形態2~7に係る送風機のプロペラファンのいずれかを適用することができる。
図20は、本発明の実施の形態9に係る送風機の構成例を示す斜視図である。図20に基づいて、実施の形態9に係る送風機について説明する。なお、実施の形態9では実施の形態1~8との相違点を中心に説明し、実施の形態1~8と同一部分には、同一符号を付して説明を省略するものとする。ここでは、実施の形態1に係る送風機のプロペラファン1が適用されている場合を例に説明するが、実施の形態2~8に係る送風機のプロペラファンのいずれかを適用することができる。
図21は、本発明の実施の形態10に係る空気調和機の室外ユニット101の構成例を示す斜視図である。図22は、室外ユニット101のプロペラファン1の回転軸13を含む断面CCで表示した模式図である。図21及び図22に基づいて、実施の形態10に係る空気調和機について説明する。なお、実施の形態10では実施の形態1~9との相違点を中心に説明し、実施の形態1~9と同一部分には、同一符号を付して説明を省略するものとする。また、ここでは、室外ユニット101に実施の形態1に係る送風機が適用されている場合を例に説明するが、室外ユニット101には実施の形態2~9に係る送風機のいずれかを適用することができる。
Claims (10)
- 回転軸に取り付けられるボスの周りに複数の翼を取り付けてなるプロペラファンと、
前記プロペラファンの外周縁を囲むベルマウスと、を有し、
前記ベルマウスは、
前記プロペラファンの外周縁を囲む円筒状のダクト部と、
前記ダクト部の上流に設けられ、上流から下流に向かって風の通過面積が縮小する入口部と、を備えており、
前記翼は、
前記回転軸に沿って見た場合に翼内周の上流端よりも翼外周の上流端が上流側にあり、翼内周の下流端よりも翼外周の下流端が下流側にあり、前記回転軸に沿って前記翼の外周及び内周のそれぞれの下流端と上流端を結ぶ線分を同じ比で内分する点同士を結んだ線分と前記回転軸に垂直な直線である基準線とのなす角度をθとし、下流側に傾く方向を正とすると、前記θが前記ダクト部で負から正に変化する
送風機。 - 前記回転軸に沿って前記翼の外周及び内周のそれぞれの下流端と上流端を結ぶ線分を2等分する点同士を結んだ線分と前記基準線とのなす角度をθが正の値になる
請求項1に記載の送風機。 - 前記翼の外周縁の下流端が前記ダクト部に囲まれている
請求項1又は2に記載の送風機。 - 前記翼の外周縁の下流端を前記ダクト部の下流端に一致されている
請求項3に記載の送風機。 - 前記翼の外周縁の下流側が前記ダクト部で囲まれ、前記翼の外周縁の上流側が前記入口部で囲まれている
請求項1~4のいずれか一項に記載の送風機。 - 前記回転軸を含む面に回転投影した断面において、前記入口部が曲線形状で構成されている
特徴とする請求項1~5のいずれか一項に記載の送風機。 - 前記翼の外周縁を上流側と下流側で内分する点と、前記翼の内周縁を外周縁と同じ比率で上流側と下流側に内分する点とを結び、前記基準線とのなす角度が0°となる線をL0とし、
前記L0と前記ダクト部の交点をRとし、
前記ダクト部の上流端と前記Rの軸方向距離をaとし、
前記ダクト部の軸方向距離をbとすると、
a/bを0以上、0.3以下の範囲とした
請求項1~6のいずれか一項に記載の送風機。 - 前記a/bを0.05以上、0.2以下の範囲とした
請求項7に記載の送風機。 - 前記ベルマウスの出口部に網目状の防護ガードを備え、
前記防護ガードは、
半径外側の網目隙間が内側に対して小さくなる
請求項1~8のいずれか一項に記載の送風機。 - 請求項1~9のいずれか一項に記載の送風機を室外ユニットに備えた
空気調和機。
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US16/072,977 US10890194B2 (en) | 2016-02-24 | 2016-02-24 | Air-sending device and air-conditioning apparatus using the same |
GB1810985.0A GB2562395B (en) | 2016-02-24 | 2016-02-24 | Air-sending device and air-conditioning apparatus using the same |
JP2018501459A JP6524331B2 (ja) | 2016-02-24 | 2016-02-24 | 送風機及びそれを用いた空気調和機 |
PCT/JP2016/055347 WO2017145275A1 (ja) | 2016-02-24 | 2016-02-24 | 送風機及びそれを用いた空気調和機 |
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EP3726150B1 (en) * | 2017-12-13 | 2023-09-13 | Mitsubishi Electric Corporation | Heat exchange unit and air conditioning device having same mounted therein |
CN207795681U (zh) * | 2018-01-13 | 2018-08-31 | 广东美的环境电器制造有限公司 | 轴流扇叶、轴流风机扇叶组件、轴流风机风道组件 |
USD910834S1 (en) * | 2018-12-05 | 2021-02-16 | Asia Vital Components Co., Ltd. | Impeller for a fan |
EP3670316A1 (en) * | 2018-12-17 | 2020-06-24 | Elomatic Oy | Grid for a tunnel thruster |
USD972120S1 (en) * | 2019-12-03 | 2022-12-06 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Ventilation unit |
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