EP1610068A1 - Outdoor unit for air conditioner - Google Patents
Outdoor unit for air conditioner Download PDFInfo
- Publication number
- EP1610068A1 EP1610068A1 EP04724144A EP04724144A EP1610068A1 EP 1610068 A1 EP1610068 A1 EP 1610068A1 EP 04724144 A EP04724144 A EP 04724144A EP 04724144 A EP04724144 A EP 04724144A EP 1610068 A1 EP1610068 A1 EP 1610068A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bell mouth
- vane
- rear edge
- profile line
- axial fan
- 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.)
- Granted
Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 10
- 230000001603 reducing effect Effects 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
-
- 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
- F24F1/40—Vibration or noise prevention at outdoor units
-
- 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
-
- 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
- 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
Definitions
- the present invention relates to an outdoor unit of an air conditioner, and more particularly to an outdoor unit provided with an axial blower which can suppress blower noise.
- the outdoor unit of the air conditioner is structured such that a bell mouth is attached to a discharge opening, and an axial blower having an axial fan provided with a plurality of vanes, which are arranged with a predetermined interval along an outer peripheral surface of a rotary hub, is arranged in an air inflow direction to the bell mouth.
- an axial fan in which a corner portion, at which a front edge portion of the vane and an outer peripheral portion of the vane intersect, protrudes largely to a rotation direction side, and a profile line of the rear edge portion is formed in a concave shape in the air inflow direction (for example, Japanese Patent Application Laid-Open No. 2002-257088).
- the present invention was conceived by taking the above circumstances into consideration, and an object of the present invention is to provide an outdoor unit of an air conditioner provided with an axial blower which intends to rectify a vane rear edge portion by optimizing a positional relation in an axial direction between the vane rear edge portion and a bell mouth, thereby reducing the blower noise.
- an outdoor unit of an air conditioner comprising: an axial fan provided with a plurality of vanes with a predetermined interval along an outer peripheral surface of a hub, each of the vanes having a vane rear edge portion having a profile line in a rotational direction to provide a concave shape in a vane front edge direction; and a bell mouth arranged on an air blowing side from the axial fan, wherein the bell mouth and the axial fan are arranged so as to satisfy a ratio (X/L) to be in a range between 0.2 and 0.8 in which X is a distance between a most recessed portion to an inner side in the rotational direction of the profile line of the vane rear edge and an air outflow surface of the bell mouth and L is a length in an axial direction of the bell mouth.
- an outdoor unit of an air conditioner comprising: an axial fan provided with a plurality of vanes with a predetermined interval along an outer peripheral surface of a hub, each of the vanes having a vane rear edge portion having a profile line in a rotational direction to provide a concave shape in a vane front edge direction; and a bell mouth arranged on an air blowing side from the axial fan, wherein the bell mouth and the axial fan are arranged so as to satisfy a ratio (Y/L) to be in a range between 0.3 and 0.9 in which Y is a distance between a point where a profile line in a circumferential direction of the vane and a profile line of the vane rear edge portion intersect and an air outflow surface of the bell mouth and L is a length in an axial direction of the bell mouth.
- Y/L a ratio
- the concave shape of the profile line of the vane rear edge portion is a circular arc shape.
- the concave shape of the profile line of the vane rear edge portion may be a V-shape or a trapezoidal shape.
- an outdoor unit of an air conditioner comprising: an axial fan provided with a plurality of vanes with a predetermined interval along an outer peripheral surface of a hub, each of the vanes having a vane rear edge portion having a profile line in a rotational direction to provide a concave shape in a vane front edge direction; and a bell mouth arranged on an air blowing side from the axial fan, wherein the bell mouth and the axial fan are arranged so as to satisfy a ratio (X/L) to be in a range between 0.2 and 0.8 in which X is a distance between a most recessed portion to an inner side in the rotational direction of the profile line of the vane rear edge and an air outflow surface of the bell mouth and L is a length in an axial direction of the bell mouth, and wherein the bell mouth and the axial fan are arranged so as to satisfy a ratio (Y/L) to be in a range between 0.3 and 0.9 in which Y is
- the outdoor unit of the air conditioner provided with the axial blower capable of satisfying both demands of a blowing rate and of reduction of the electric motor load, inhibiting a vortex generated in the vane rear edge portion of the axial fan and reducing a blower noise, by setting a positional relation between the vane of the axial fan and the bell mouth to an optimum value, in the outdoor unit of the air conditioner.
- Fig. 1 is a sectional view of an outdoor unit 1 of an air conditioner.
- the outdoor unit 1 is used in a state of being connected to an indoor unit, not shown, and is constituted by a bottom plate 2 arranged in a floor surface outside the room, structural members or parts, which will be mentioned hereinlater, arranged on the bottom plate 2, a discharge opening 4 and a main body cover 3 having a fan guard 5 which covers the discharge opening 4 and covering the structural members and the bottom plate 2.
- the outdoor unit 1 is provided with a compressor 6 circulating a refrigerant in a refrigeration cycle, a refrigeration cycle member including an outdoor heat exchanger 7 in which plate-like heat radiation fins are laminated with a predetermined interval in a heat exchanger tube through which the refrigerant flows, a blower 8 for supplying an outdoor air to the outdoor heat exchanger 7, and a bell mouth 9 formed to the discharge opening 4, as the structural members, in an inner portion thereof.
- the blower 8 is constituted by an axial fan 10 and a fan motor 11 and is arranged between the outdoor heat exchanger 7 and the bell mouth 9 in an axial direction thereof.
- the fan motor 11 is mounted to a motor fixing plate 11a mounted to the bottom plate 2 by a fixture such as screw or the like.
- the structural members or parts are arranged side by side in an axial direction of the motor in the order of the outdoor heat exchanger 7, the fan motor 11, the axial fan 10 and the bell mouth 9, from an upstream side of an air generated by the axial fan 10.
- Fig. 2 is a plan view showing an entire structure of the axial fan 10 according to the present invention viewed from a positive pressure surface side of vanes 10b
- Fig. 3 is an enlarged view showing one vane 10b in Fig. 2.
- a plurality of vanes 10b are integrated with or integrally attached to a side surface of an outer peripheral surface of a cylindrical hub 10a at uniformly divided positions in a circumferential direction thereof and is integrally formed, for example, by resin molding or the like.
- a rotating shaft of the fan motor 11 is inserted into and then fixed to a central portion of the hub 10a, and the axial fan 10 is rotated in a direction of an arrow M by the fan motor 11.
- the vane 10b has a portion integrally connected to the hub 10a as a root portion 20. Further, a front side in a rotational direction (M) of the vane 10b is formed as a vane front edge portion 21, a rear side in the rotational direction is formed as a vane rear edge portion 22, and an end portion connecting an outer peripheral end portion of the vane front edge portion 21 and an outer peripheral end portion of the vane rear edge 22 is formed as a vane outer peripheral portion 23.
- M rotational direction
- the vane front edge portion 21 corresponds to an air introducing direction
- the vane rear edge portion 22 corresponds to an air outflow direction (Fig. 3).
- the vane front edge portion 21 largely protrudes in the rotating or rotational direction toward the vane outer peripheral portion 23 from the root portion 20, and a profile line of the vane rear edge portion 22 is formed as a circular arc shaped concave portion recessed in the introducing direction opposite to the air outflow direction.
- a corner portion corresponding to a connection portion (an intersection portion) between the vane rear edge portion 22 and the vane outer peripheral portion 23 is formed as a convex bulge portion 24 bulging in the air outflow direction.
- the air is sucked into an inner portion of the outdoor unit by the rotation of the axial fan 10 and passes through the outdoor heat exchanger 7, the axial fan 10 and the bell mouth 9, and the air is then discharged to the outside of the outdoor unit 1 from the fan guard 5.
- Fig. 4 is a view showing a positional relation between the axial fan 10 and the bell mouth 9 in the first embodiment.
- the bell mouth 9 is provided around the discharge opening 4 of the main body cover 3 and is opposed to the vane rear edge portion 22 in the axial direction of the axial fan 10.
- the vane rear edge portion 22 of the vane 10b is arranged such that points G and Q thereof completely lap over the bell mouth 9 in an axial direction so as to enter into the bell mouth.
- Fig. 5 is a graph showing a relation between a ratio (X/L) and a blower noise in which a distance between a point G most recessed into an inner side in the rotational direction of the vane rear edge portion 22 of the vane 10b and the air outflow surface 9b of the bell mouth 9 in Fig. 4 is set to X, and a length in the axial direction of the bell mouth 9 is set to L.
- the blower noise is reduced by arranging the axial fan 10 and the bell mouth 9 in a range in which the length X from the point G of the vane rear edge portion 22 to the air outflow surface 9b of the bell mouth is between about 20% of the length L in the axial direction of the bell mouth 9 and 80% (0.2L to 0.8L), and in particular, the blower noise becomes minimum when the length X is near 50% of the length L. Accordingly, it is experimentally known that it is effective to set the length X to the range mentioned above to reduce the blower noise.
- the experiment for this knowledge has been executed by installing the outdoor unit within an anechoic room and placing a microphone connected to a noise level meter at a position 1 m apart from a front surface of the outdoor unit, on the basis of JIS (Z 8731).
- the blower noise through the microphone is displayed on the noise level meter by a sound pressure level (dB).
- the first modified embodiment shown in Fig. 6 has a shape of the vane rear edge portion different from the shape of the vane rear edge portion 22 of the first embodiment in Fig. 3, the other same or identical portions are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the axial fan has a profile line of the vane rear edge portion 22 used in the first embodiment, the axial fan being formed with an approximately V-shaped concave portion.
- the axial fan 10 is provided with the vane rear edge portion 22 having the profile line of approximately V-shaped concave portion recessed in an introducing direction opposite to the air outflow direction.
- a peak Z of the V-shape corresponds to a point G of the circular arc shaped concave portion in the first embodiment
- a point Q1 where the rear edge portion 22 of the V-shape and the vane outer peripheral portion 23 intersect corresponds to the point Q in the first embodiment
- the second modified embodiment shown in Fig. 7 has a shape of the vane rear edge portion different from the shape of the vane rear edge portion 22 of the first embodiment in Fig. 3, the other same or identical portions are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the axial fan has a profile line of the vane rear edge portion 22 used in the first embodiment, the axial fan being formed with a trapezoidal concave portion.
- the axial fan 10 is provided with the vane rear edge portion 22 having the profile line of approximately trapezoidal concave portion recessed in an introducing direction opposite to the air outflow direction.
- a linear portion U of the trapezoidal shape corresponds to the point G in the first embodiment
- a point Q2 where the rear edge portion 22 of the trapezoidal shape and the vane outer peripheral portion 23 intersect corresponds to the point Q in the first embodiment
- the bulge portion 24 of the vane 10b is arranged so as not to protrude from the air outflow surface 9b of the bell mouth 9 in the axial direction, contrary to the structure shown in Fig. 4.
- Fig. 8 relates to the second embodiment and is a graph showing a relation between a ratio (Y/L) and the blower noise in which a point where the vane outer peripheral portion 23 of the vane 10b and the vane rear edge portion 22 intersect is set to a point Q, a distance between the point Q and the air outflow surface 9b of the bell mouth 9 is set to Y, and the length in the axial direction of the bell mouth 9 is set to L.
- the blower noise is reduced by arranging the axial fan 10 and the bell mouth 9 in a range in which the length Y from the point Q of the vane rear edge portion 22 to the air outflow surface 9b of the bell mouth is between about 30% of the length L in the axial direction of the bell mouth 9 and 90% (0.3L to 0.9L), and in particular, the blower noise becomes minimum when the length Y is near 60% of the length L. Accordingly, it was found through an experiment that it is effective to set the length Y to the range mentioned above in order to reduce the blower noise. The experiment was executed under the same condition as that executed in connection with the first embodiment.
- an outdoor unit of an air conditioner provided with an axial blower which can satisfy both the requirements of the blowing rate and of reducing the electric motor load, and in addition, the vortex generation in the vane rear edge portion of the axial fan can be inhibited and the blower noise can be effectively reduced.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Other Air-Conditioning Systems (AREA)
Abstract
In an outdoor unit of an air conditioner, provided with
an axial fan provided with a plurality of vanes arranged with
a predetermined interval along an outer peripheral surface of
a hub, each of the vanes having a vane rear edge portion
having a profile line in a rotational direction so as to provide
concave shape in a vane front edge direction, and a bell
mouth arranged in an air blowing side by the axial fan, the
outdoor unit is provided with an axial blower in which the
bell mouth and the axial fan are arranged so as to satisfy a
ratio (X/L) to be in a range between 0.2 and 0.8 in which X is
a distance between a most fallen portion to an inner side in
the rotational direction of the profile line of the vane rear
edge and an air outflow surface of the bell mouth, and L is a
length in an axial direction of the bell mouth.
Description
The present invention relates to an outdoor unit of an
air conditioner, and more particularly to an outdoor unit
provided with an axial blower which can suppress blower
noise.
Conventionally, the outdoor unit of the air conditioner
is structured such that a bell mouth is attached to a
discharge opening, and an axial blower having an axial fan
provided with a plurality of vanes, which are arranged with
a predetermined interval along an outer peripheral surface of
a rotary hub, is arranged in an air inflow direction to the bell
mouth.
In the axial fan of the outdoor unit as mentioned above,
when air is blown in an axial direction in accordance with a
rotation of the axial fan, a front edge portion of the vane
accords with an air introducing direction, and a rear edge
portion of the vane accords with an air outflow direction.
In recent years, in order to fulfil a demand of
increasing a blowing amount and a demand of reducing a
load of an electric motor, there has been provided an axial
fan in which a corner portion, at which a front edge portion
of the vane and an outer peripheral portion of the vane
intersect, protrudes largely to a rotation direction side, and a
profile line of the rear edge portion is formed in a concave
shape in the air inflow direction (for example, Japanese
Patent Application Laid-Open No. 2002-257088).
In the axial fan mentioned above, it is possible to
reduce a vortex generated in wake of the vane rear edge
portion and, hence, to attain an effect of reducing the blower
noise and reducing the electric motor load in comparison
with a case that the rear edge portion of the vane is formed
in an approximately linear shape,.
However, in the conventional axial fan, since the profile
line of the vane rear edge portion is positioned in an air
introducing direction from a side peripheral end of the air
inflow surface of the bell mouth, the air flowing out from the
vane rear edge portion comes into collision with a peripheral
end portion of the air inflow surface of the bell mouth,
generating the vortex and, thereby, causing an increase of
the blower noise.
The present invention was conceived by taking the
above circumstances into consideration, and an object of the
present invention is to provide an outdoor unit of an air
conditioner provided with an axial blower which intends to
rectify a vane rear edge portion by optimizing a positional
relation in an axial direction between the vane rear edge
portion and a bell mouth, thereby reducing the blower noise.
In order to achieve the above object, according to the
present invention, there is provided an outdoor unit of an air
conditioner, comprising: an axial fan provided with a
plurality of vanes with a predetermined interval along an
outer peripheral surface of a hub, each of the vanes having a
vane rear edge portion having a profile line in a rotational
direction to provide a concave shape in a vane front edge
direction; and a bell mouth arranged on an air blowing side
from the axial fan, wherein the bell mouth and the axial fan
are arranged so as to satisfy a ratio (X/L) to be in a range
between 0.2 and 0.8 in which X is a distance between a most
recessed portion to an inner side in the rotational direction
of the profile line of the vane rear edge and an air outflow
surface of the bell mouth and L is a length in an axial
direction of the bell mouth.
The above object can be also achieved by providing an
outdoor unit of an air conditioner, comprising: an axial fan
provided with a plurality of vanes with a predetermined
interval along an outer peripheral surface of a hub, each of
the vanes having a vane rear edge portion having a profile
line in a rotational direction to provide a concave shape in a
vane front edge direction; and a bell mouth arranged on an
air blowing side from the axial fan, wherein the bell mouth
and the axial fan are arranged so as to satisfy a ratio (Y/L) to
be in a range between 0.3 and 0.9 in which Y is a distance
between a point where a profile line in a circumferential
direction of the vane and a profile line of the vane rear edge
portion intersect and an air outflow surface of the bell mouth
and L is a length in an axial direction of the bell mouth.
In the above embodiments, it is desired that the
concave shape of the profile line of the vane rear edge portion
is a circular arc shape.
The concave shape of the profile line of the vane rear
edge portion may be a V-shape or a trapezoidal shape.
More preferably, the above object of the present
invention is achieved by providing an outdoor unit of an air
conditioner, comprising: an axial fan provided with a
plurality of vanes with a predetermined interval along an
outer peripheral surface of a hub, each of the vanes having a
vane rear edge portion having a profile line in a rotational
direction to provide a concave shape in a vane front edge
direction; and a bell mouth arranged on an air blowing side
from the axial fan, wherein the bell mouth and the axial fan
are arranged so as to satisfy a ratio (X/L) to be in a range
between 0.2 and 0.8 in which X is a distance between a most
recessed portion to an inner side in the rotational direction
of the profile line of the vane rear edge and an air outflow
surface of the bell mouth and L is a length in an axial
direction of the bell mouth, and wherein the bell mouth and
the axial fan are arranged so as to satisfy a ratio (Y/L) to be
in a range between 0.3 and 0.9 in which Y is a distance
between a point where a profile line in a circumferential
direction of the vane and a profile line of the vane rear edge
portion intersect and an air outflow surface of the bell mouth
and L is a length in an axial direction of the bell mouth.
As described above, according to the present invention,
it is possible to provide the outdoor unit of the air
conditioner provided with the axial blower capable of
satisfying both demands of a blowing rate and of reduction of
the electric motor load, inhibiting a vortex generated in the
vane rear edge portion of the axial fan and reducing a blower
noise, by setting a positional relation between the vane of the
axial fan and the bell mouth to an optimum value, in the
outdoor unit of the air conditioner.
Hereunder, embodiments according to the present
invention will be described with reference to Figs. 1 to 8.
Fig. 1 is a sectional view of an outdoor unit 1 of an air
conditioner.
The outdoor unit 1 is used in a state of being connected
to an indoor unit, not shown, and is constituted by a bottom
plate 2 arranged in a floor surface outside the room,
structural members or parts, which will be mentioned
hereinlater, arranged on the bottom plate 2, a discharge
opening 4 and a main body cover 3 having a fan guard 5
which covers the discharge opening 4 and covering the
structural members and the bottom plate 2.
The outdoor unit 1 is provided with a compressor 6
circulating a refrigerant in a refrigeration cycle, a
refrigeration cycle member including an outdoor heat
exchanger 7 in which plate-like heat radiation fins are
laminated with a predetermined interval in a heat exchanger
tube through which the refrigerant flows, a blower 8 for
supplying an outdoor air to the outdoor heat exchanger 7,
and a bell mouth 9 formed to the discharge opening 4, as the
structural members, in an inner portion thereof.
The blower 8 is constituted by an axial fan 10 and a
fan motor 11 and is arranged between the outdoor heat
exchanger 7 and the bell mouth 9 in an axial direction
thereof.
The fan motor 11 is mounted to a motor fixing plate
11a mounted to the bottom plate 2 by a fixture such as screw
or the like.
In this case, the structural members or parts are
arranged side by side in an axial direction of the motor in the
order of the outdoor heat exchanger 7, the fan motor 11, the
axial fan 10 and the bell mouth 9, from an upstream side of
an air generated by the axial fan 10.
Fig. 2 is a plan view showing an entire structure of the
axial fan 10 according to the present invention viewed from a
positive pressure surface side of vanes 10b, and Fig. 3 is an
enlarged view showing one vane 10b in Fig. 2.
In the axial fan 10 of the first embodiment of the
present invention shown in Figs. 2 and 3, a plurality of vanes
10b are integrated with or integrally attached to a side
surface of an outer peripheral surface of a cylindrical hub
10a at uniformly divided positions in a circumferential
direction thereof and is integrally formed, for example, by
resin molding or the like.
A rotating shaft of the fan motor 11 is inserted into and
then fixed to a central portion of the hub 10a, and the axial
fan 10 is rotated in a direction of an arrow M by the fan
motor 11.
The vane 10b has a portion integrally connected to the
hub 10a as a root portion 20. Further, a front side in a
rotational direction (M) of the vane 10b is formed as a vane
front edge portion 21, a rear side in the rotational direction
is formed as a vane rear edge portion 22, and an end portion
connecting an outer peripheral end portion of the vane front
edge portion 21 and an outer peripheral end portion of the
vane rear edge 22 is formed as a vane outer peripheral
portion 23.
Further, with reference to the airflow on the vane 10b
in accordance with the rotation of the axial fan 10, the vane
front edge portion 21 corresponds to an air introducing
direction, and the vane rear edge portion 22 corresponds to
an air outflow direction (Fig. 3).
The vane front edge portion 21 largely protrudes in the
rotating or rotational direction toward the vane outer
peripheral portion 23 from the root portion 20, and a profile
line of the vane rear edge portion 22 is formed as a circular
arc shaped concave portion recessed in the introducing
direction opposite to the air outflow direction.
Further, a corner portion corresponding to a connection
portion (an intersection portion) between the vane rear edge
portion 22 and the vane outer peripheral portion 23 is formed
as a convex bulge portion 24 bulging in the air outflow
direction.
The air is sucked into an inner portion of the outdoor
unit by the rotation of the axial fan 10 and passes through
the outdoor heat exchanger 7, the axial fan 10 and the bell
mouth 9, and the air is then discharged to the outside of the
outdoor unit 1 from the fan guard 5.
Fig. 4 is a view showing a positional relation between
the axial fan 10 and the bell mouth 9 in the first embodiment.
The bell mouth 9 is provided around the discharge opening 4
of the main body cover 3 and is opposed to the vane rear edge
portion 22 in the axial direction of the axial fan 10.
In this case, the vane rear edge portion 22 of the vane
10b is arranged such that points G and Q thereof completely
lap over the bell mouth 9 in an axial direction so as to enter
into the bell mouth.
Fig. 5 is a graph showing a relation between a ratio
(X/L) and a blower noise in which a distance between a point
G most recessed into an inner side in the rotational direction
of the vane rear edge portion 22 of the vane 10b and the air
outflow surface 9b of the bell mouth 9 in Fig. 4 is set to X,
and a length in the axial direction of the bell mouth 9 is set
to L.
As shown in Fig. 5, the blower noise is reduced by
arranging the axial fan 10 and the bell mouth 9 in a range in
which the length X from the point G of the vane rear edge
portion 22 to the air outflow surface 9b of the bell mouth is
between about 20% of the length L in the axial direction of
the bell mouth 9 and 80% (0.2L to 0.8L), and in particular,
the blower noise becomes minimum when the length X is near
50% of the length L. Accordingly, it is experimentally known
that it is effective to set the length X to the range mentioned
above to reduce the blower noise. The experiment for this
knowledge has been executed by installing the outdoor unit
within an anechoic room and placing a microphone connected
to a noise level meter at a position 1 m apart from a front
surface of the outdoor unit, on the basis of JIS (Z 8731).
The blower noise through the microphone is displayed on the
noise level meter by a sound pressure level (dB).
Accordingly, it is possible to inhibit vortex generation
by a collision of the air flowing out from the vane rear edge
portion 22 with the peripheral end portion of the air inflow
surface 9a of the bell mouth 9, and it is possible to reduce
the blower noise generated by the vortex.
Hereunder, a modified embodiment of the outdoor unit
of the air conditioner according to the above-mentioned first
embodiment of the present invention will be described.
Although the first modified embodiment shown in Fig. 6
has a shape of the vane rear edge portion different from the
shape of the vane rear edge portion 22 of the first
embodiment in Fig. 3, the other same or identical portions
are denoted by the same reference numerals, and detailed
description thereof will be omitted.
In the modified embodiment, the axial fan has a profile
line of the vane rear edge portion 22 used in the first
embodiment, the axial fan being formed with an
approximately V-shaped concave portion.
As shown in Fig. 6, the axial fan 10 is provided with
the vane rear edge portion 22 having the profile line of
approximately V-shaped concave portion recessed in an
introducing direction opposite to the air outflow direction.
In this case, a peak Z of the V-shape corresponds to a
point G of the circular arc shaped concave portion in the first
embodiment, and a point Q1 where the rear edge portion 22
of the V-shape and the vane outer peripheral portion 23
intersect corresponds to the point Q in the first embodiment.
In the results obtained by executing the same
experiment as that executed in the first embodiment with the
use of the axial fan having the shape of the first modified
embodiment mentioned above, the same effects as those of
the first embodiment could be obtained.
A second modified embodiment of the outdoor unit of
the air conditioner according to the first embodiment of the
present invention will be further described with reference to
Fig. 7.
Although the second modified embodiment shown in Fig.
7 has a shape of the vane rear edge portion different from the
shape of the vane rear edge portion 22 of the first
embodiment in Fig. 3, the other same or identical portions
are denoted by the same reference numerals, and detailed
description thereof will be omitted.
In this second modified embodiment, the axial fan has
a profile line of the vane rear edge portion 22 used in the
first embodiment, the axial fan being formed with a
trapezoidal concave portion.
As shown in Fig. 7, the axial fan 10 is provided with
the vane rear edge portion 22 having the profile line of
approximately trapezoidal concave portion recessed in an
introducing direction opposite to the air outflow direction.
In this case, a linear portion U of the trapezoidal shape
corresponds to the point G in the first embodiment, and a
point Q2 where the rear edge portion 22 of the trapezoidal
shape and the vane outer peripheral portion 23 intersect
corresponds to the point Q in the first embodiment.
In the results obtained by executing the same
experiment as that executed in the first embodiment with the
use of the axial fan having the shape of the second modified
embodiment mentioned above, the same effects as those of
the first embodiment could be obtained.
Next, an outdoor unit of the air conditioner according
to the second embodiment of the present invention will be
further described.
In this second embodiment, the same portions as those
of the first embodiment shown in Fig. 4 are denoted by the
same reference numerals and a description thereof will be
omitted.
In the second embodiment, the bulge portion 24 of the
vane 10b is arranged so as not to protrude from the air
outflow surface 9b of the bell mouth 9 in the axial direction,
contrary to the structure shown in Fig. 4.
Fig. 8 relates to the second embodiment and is a graph
showing a relation between a ratio (Y/L) and the blower noise
in which a point where the vane outer peripheral portion 23
of the vane 10b and the vane rear edge portion 22 intersect is
set to a point Q, a distance between the point Q and the air
outflow surface 9b of the bell mouth 9 is set to Y, and the
length in the axial direction of the bell mouth 9 is set to L.
As shown in Fig. 8, the blower noise is reduced by
arranging the axial fan 10 and the bell mouth 9 in a range in
which the length Y from the point Q of the vane rear edge
portion 22 to the air outflow surface 9b of the bell mouth is
between about 30% of the length L in the axial direction of
the bell mouth 9 and 90% (0.3L to 0.9L), and in particular,
the blower noise becomes minimum when the length Y is near
60% of the length L. Accordingly, it was found through an
experiment that it is effective to set the length Y to the range
mentioned above in order to reduce the blower noise. The
experiment was executed under the same condition as that
executed in connection with the first embodiment.
As mentioned above, it is therefore possible to inhibit a
vortex flow generated by a collision of the air flowing out
from the bulge portion 24 with the fan guard 5 in the wake
side of the axial fan 10, and it is also possible to reduce the
blower noise generated by the vortex.
Further, in a further preferred embodiment of the
present invention, such as that designed so as to satisfy both
of the relation (the ratio) between the values X and L in the
first embodiment, as shown in Fig. 4, and the relation (the
ratio) between the values Y and L in the second embodiment,
it goes without saying that the noise reducing effect is
increased.
As mentioned above, in accordance with the present
invention, there can be provided an outdoor unit of an air
conditioner provided with an axial blower which can satisfy
both the requirements of the blowing rate and of reducing the
electric motor load, and in addition, the vortex generation in
the vane rear edge portion of the axial fan can be inhibited
and the blower noise can be effectively reduced.
Claims (9)
- An outdoor unit of an air conditioner, comprising:wherein the bell mouth and the axial fan are arranged so as to satisfy a ratio (X/L) to be in a range between 0.2 and 0.8 in which X is a distance between a most recessed portion to an inner side in the rotational direction of the profile line of the vane rear edge and an air outflow surface of the bell mouth and L is a length in an axial direction of the bell mouth.an axial fan provided with a plurality of vanes with a predetermined interval along an outer peripheral surface of a hub, each of the vanes having a vane rear edge portion having a profile line in a rotational direction to provide a concave shape in a vane front edge direction; anda bell mouth arranged on an air blowing side from the axial fan,
- The outdoor unit of an air conditioner according to claim 1, wherein the concave shape of the profile line of the vane rear edge portion is a circular arc shape.
- The outdoor unit of an air conditioner according to claim 1, wherein the concave shape of the profile line of the vane rear edge portion is a V-shape.
- The outdoor unit of an air conditioner according to claim 1, wherein the concave shape of the profile line of the vane rear edge portion is a trapezoidal shape.
- An outdoor unit of an air conditioner, comprising:wherein the bell mouth and the axial fan are arranged so as to satisfy a ratio (Y/L) to be in a range between 0.3 and 0.9 in which Y is a distance between a point where a profile line in a circumferential direction of the vane and a profile line of the vane rear edge portion intersect and an air outflow surface of the bell mouth and L is a length in an axial direction of the bell mouth.an axial fan provided with a plurality of vanes with a predetermined interval along an outer peripheral surface of a hub, each of the vanes having a vane rear edge portion having a profile line in a rotational direction to provide a concave shape in a vane front edge direction; anda bell mouth arranged on an air blowing side from the axial fan,
- The outdoor unit of an air conditioner according to claim 5, wherein the concave shape of the profile line of the vane rear edge portion is a circular arc shape.
- The outdoor unit of an air conditioner according to claim 5, wherein the concave shape of the profile line of the vane rear edge portion is a V-shape.
- The outdoor unit of an air conditioner according to claim 5, wherein the concave shape of the profile line of the vane rear edge portion is a trapezoidal shape.
- An outdoor unit of an air conditioner, comprising:wherein the bell mouth and the axial fan are arranged so as to satisfy a ratio (X/L) to be in a range between 0.2 and 0.8 in which X is a distance between a most recessed portion to an inner side in the rotational direction of the profile line of the vane rear edge and an air outflow surface of the bell mouth and L is a length in an axial direction of the bell mouth, andan axial fan provided with a plurality of vanes with a predetermined interval along an outer peripheral surface of a hub, each of the vanes having a vane rear edge portion having a profile line in a rotational direction to provide a concave shape in a vane front edge direction; anda bell mouth arranged on an air blowing side from the axial fan,
wherein the bell mouth and the axial fan are arranged so as to satisfy a ratio (Y/L) to be in a range between 0.3 and 0.9 in which Y is a distance between a point where a profile line in a circumferential direction of the vane and a profile line of the vane rear edge portion intersect and an air outflow surface of the bell mouth and L is a length in an axial direction of the bell mouth.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003096748A JP2004301451A (en) | 2003-03-31 | 2003-03-31 | Outdoor machine for air conditioner |
| JP2003096748 | 2003-03-31 | ||
| PCT/JP2004/004426 WO2004088210A1 (en) | 2003-03-31 | 2004-03-29 | Outdoor unit for air conditioner |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1610068A1 true EP1610068A1 (en) | 2005-12-28 |
| EP1610068A4 EP1610068A4 (en) | 2007-11-21 |
| EP1610068B1 EP1610068B1 (en) | 2009-09-16 |
Family
ID=33127524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04724144A Expired - Lifetime EP1610068B1 (en) | 2003-03-31 | 2004-03-29 | Outdoor unit for air conditioner |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1610068B1 (en) |
| JP (1) | JP2004301451A (en) |
| KR (1) | KR100724824B1 (en) |
| CN (2) | CN100343590C (en) |
| ES (1) | ES2332591T3 (en) |
| WO (1) | WO2004088210A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2085618A2 (en) * | 2008-01-30 | 2009-08-05 | LG Electronics Inc. | Outdoor unit of air-conditioner and fan used therefor |
| EP2960525A4 (en) * | 2013-02-22 | 2016-10-12 | Hitachi Appliances Inc | Propeller fan and air conditioner equipped with same |
| EP3182025A1 (en) * | 2015-12-14 | 2017-06-21 | Lg Electronics Inc. | Orifice for air conditioner |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4689262B2 (en) * | 2004-12-21 | 2011-05-25 | 東芝キヤリア株式会社 | Axial fan, outdoor unit of air conditioner |
| KR100749656B1 (en) | 2006-12-15 | 2007-08-14 | 주식회사 케이티 | Low noise type outdoor unit |
| JP5178816B2 (en) * | 2008-03-11 | 2013-04-10 | 三菱電機株式会社 | Air conditioner |
| KR20130109515A (en) * | 2012-03-27 | 2013-10-08 | 삼성전자주식회사 | Axial fan of outdoor unit of air conditioner |
| CN102720700B (en) * | 2012-06-21 | 2015-11-25 | 海尔集团公司 | The blade of axial fan and axial flow fan for air conditioner |
| US9551498B2 (en) * | 2012-06-28 | 2017-01-24 | Samsung Electronics Co., Ltd. | Indoor unit of air conditioner and method of controlling the air conditioner |
| JP6170783B2 (en) * | 2012-09-19 | 2017-07-26 | 東芝キヤリア株式会社 | Outdoor unit of propeller fan and air conditioner |
| CN106903875A (en) * | 2017-03-16 | 2017-06-30 | 青岛科技大学 | A kind of 3D printing small-sized screw plasticizing apparatus |
| JP7173939B2 (en) * | 2019-08-26 | 2022-11-16 | ダイキン工業株式会社 | Blower and heat pump unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002257088A (en) * | 2001-03-06 | 2002-09-11 | Toshiba Kyaria Kk | Axial flow fan |
| JP2002257096A (en) * | 2000-12-28 | 2002-09-11 | Daikin Ind Ltd | Outdoor unit for blower and air conditioner |
| JP2003013892A (en) * | 2001-04-26 | 2003-01-15 | Daikin Ind Ltd | Blower and air conditioner with blower |
| EP1357296A1 (en) * | 2000-12-28 | 2003-10-29 | Daikin Industries, Ltd. | Blower, and outdoor unit for air conditioner |
| EP1382856A1 (en) * | 2001-04-26 | 2004-01-21 | Daikin Industries, Ltd. | Blower and air conditioner with the blower |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2932814B2 (en) * | 1992-02-21 | 1999-08-09 | ダイキン工業株式会社 | Air conditioner |
| JPH06137608A (en) * | 1992-10-28 | 1994-05-20 | Toshiba Ave Corp | Outdoor unit for air conditioning apparatus |
-
2003
- 2003-03-31 JP JP2003096748A patent/JP2004301451A/en active Pending
-
2004
- 2004-03-29 CN CNB2004800085038A patent/CN100343590C/en not_active Expired - Lifetime
- 2004-03-29 CN CNB2007100057438A patent/CN100480591C/en not_active Expired - Lifetime
- 2004-03-29 ES ES04724144T patent/ES2332591T3/en not_active Expired - Lifetime
- 2004-03-29 EP EP04724144A patent/EP1610068B1/en not_active Expired - Lifetime
- 2004-03-29 KR KR1020057018293A patent/KR100724824B1/en active IP Right Grant
- 2004-03-29 WO PCT/JP2004/004426 patent/WO2004088210A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002257096A (en) * | 2000-12-28 | 2002-09-11 | Daikin Ind Ltd | Outdoor unit for blower and air conditioner |
| EP1357296A1 (en) * | 2000-12-28 | 2003-10-29 | Daikin Industries, Ltd. | Blower, and outdoor unit for air conditioner |
| JP2002257088A (en) * | 2001-03-06 | 2002-09-11 | Toshiba Kyaria Kk | Axial flow fan |
| JP2003013892A (en) * | 2001-04-26 | 2003-01-15 | Daikin Ind Ltd | Blower and air conditioner with blower |
| EP1382856A1 (en) * | 2001-04-26 | 2004-01-21 | Daikin Industries, Ltd. | Blower and air conditioner with the blower |
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| Title |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2085618A2 (en) * | 2008-01-30 | 2009-08-05 | LG Electronics Inc. | Outdoor unit of air-conditioner and fan used therefor |
| EP2085618A3 (en) * | 2008-01-30 | 2011-10-12 | LG Electronics, Inc. | Outdoor unit of air-conditioner and fan used therefor |
| US8191381B2 (en) | 2008-01-30 | 2012-06-05 | Lg Electronics Inc. | Outdoor unit of air-conditioner and fan used therefor |
| EP2960525A4 (en) * | 2013-02-22 | 2016-10-12 | Hitachi Appliances Inc | Propeller fan and air conditioner equipped with same |
| EP3182025A1 (en) * | 2015-12-14 | 2017-06-21 | Lg Electronics Inc. | Orifice for air conditioner |
| US10054355B2 (en) | 2015-12-14 | 2018-08-21 | Lg Electronics Inc. | Orifice for air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2332591T3 (en) | 2010-02-09 |
| WO2004088210A1 (en) | 2004-10-14 |
| CN101025281A (en) | 2007-08-29 |
| JP2004301451A (en) | 2004-10-28 |
| CN100343590C (en) | 2007-10-17 |
| EP1610068A4 (en) | 2007-11-21 |
| EP1610068B1 (en) | 2009-09-16 |
| KR20050120678A (en) | 2005-12-22 |
| KR100724824B1 (en) | 2007-06-04 |
| CN100480591C (en) | 2009-04-22 |
| CN1768237A (en) | 2006-05-03 |
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