EP2757268B1 - Scirocco fan and air-conditioning apparatus - Google Patents
Scirocco fan and air-conditioning apparatus Download PDFInfo
- Publication number
- EP2757268B1 EP2757268B1 EP14164771.9A EP14164771A EP2757268B1 EP 2757268 B1 EP2757268 B1 EP 2757268B1 EP 14164771 A EP14164771 A EP 14164771A EP 2757268 B1 EP2757268 B1 EP 2757268B1
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- European Patent Office
- Prior art keywords
- air
- fan
- scroll
- point
- motor
- Prior art date
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- 238000004378 air conditioning Methods 0.000 title claims description 9
- 238000007664 blowing Methods 0.000 description 27
- 230000003068 static effect Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. 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
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
- F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/422—Discharge tongues
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
-
- 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
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/601—Mounting; Assembling; Disassembling specially adapted for elastic fluid pumps
- F04D29/602—Mounting in cavities
-
- 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
-
- 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
-
- 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
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
- F24F1/0022—Centrifugal or radial fans
-
- 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
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0018—Indoor units, e.g. fan coil units characterised by fans
- F24F1/0033—Indoor units, e.g. fan coil units characterised by fans having two or more fans
-
- 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
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
- F24F1/0047—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in the ceiling or at the ceiling
-
- 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
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0043—Indoor units, e.g. fan coil units characterised by mounting arrangements
- F24F1/0057—Indoor units, e.g. fan coil units characterised by mounting arrangements mounted in or on a wall
-
- 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
- F24F1/0007—Indoor units, e.g. fan coil units
- F24F1/0059—Indoor units, e.g. fan coil units characterised by heat exchangers
- F24F1/0063—Indoor units, e.g. fan coil units characterised by heat exchangers by the mounting or arrangement of the heat exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/007—Ventilation with forced flow
-
- 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
- F05D2250/50—Inlet or outlet
- F05D2250/52—Outlet
Definitions
- the present invention relates to a sirocco fan and an air-conditioning apparatus in which a noise is reduced and an air-blowing characteristic is improved.
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 9-126193 (Pages 4 and 5, Fig. 1 and Fig. 2 )
- Patent Document 2 Japanese Unexamined Patent Application Publication No. 2006-138268 (Page 4, Fig. 1 and Fig. 3 )
- JP H11 324992 A discloses a blower provided with an impeller and a scroll casing including a tongue part and a auxiliary tongue part.
- an object of the present invention is to provide a sirocco fan capable of obtaining a large air-blowing amount at a time of a predetermined noise occurrence, in other words, to provide a sirocco fan capable of reducing a noise value and a number of revolutions of the sirocco fan, when obtaining a predetermined air-blowing amount, and the air-conditioning apparatus provided with the sirocco fan.
- Another object of the present invention is to suppress a reverse flow phenomenon by devising a shape of a scroll, and thereby reducing the noise value while keeping the predetermined air-blowing amount.
- the sirocco fan including a scroll, a fan body that is rotatably disposed in the scroll and includes a large number of blades arranged in a cylindrical manner, and a motor for rotationally driving the fan body
- the scroll includes two straight line portions being approximately in parallel with each other on a whorl-like outer shape thereof, and a rotation shaft of the motor is positioned nearer to one of the two straight line portions, which is situated nearer a tongue portion of the scroll.
- Fig. 1 is composed of a schematic plan view (a) and a schematic side elevation (b) illustrating an inner construction of an indoor unit of an air-conditioning apparatus provided with a sirocco fan in a first embodiment according to the present invention.
- a reference numeral 10 denotes an indoor unit constituting an indoor air-conditioning apparatus, and is provided with a pair of sirocco fans 1 and 1, a fan motor 2 that rotationally drives these sirocco fans 1 and 1 simultaneously, and a heat exchanger 3 that performs a heat-exchanging operation with air that is blown out from the sirocco fan 1.
- the sirocco fan 1 is provided with a whorl-shaped scroll 6, and a fan body including a large number of blades that are rotatably disposed in the scroll 6 and arranged in a cylindrical manner.
- a reference numeral 4 denotes a suction opening for the air
- a reference numeral 5 denotes a blowing-out opening for cool air or warm air
- a reference numeral 7 denotes a rotation shaft of the fan motor 2
- a reference numeral 8 denotes a tongue portion.
- the aforementioned indoor unit 10 is provided with a refrigerating circuit for a refrigerant, which is composed of a compressor, a condenser, an expansion valve, and an evaporator, all of which are not illustrated, and is configured to perform a cooling operation, a heating operation, or the like in a room.
- a refrigerating circuit for a refrigerant which is composed of a compressor, a condenser, an expansion valve, and an evaporator, all of which are not illustrated, and is configured to perform a cooling operation, a heating operation, or the like in a room.
- the sirocco fan 1 is configured to have a fan-diameter ⁇ of 160 mm, a width dimension of 190 mm, the number of the blades of 40, and the heat exchanger 3 is provided with a heat transmission pipe of 12 steps, and an array pitch of the heat transmission pipe is 12.7 mm and a step pitch thereof is 20.4 mm, a length in an axial direction of the heat transmission pipe is 700 mm, and a draft resistance ⁇ P1 is 23.1 V 1.3 [Pa] (V: velocity[m/s]). Furthermore, the indoor unit 10 is configured to have a depth of 680 mm, a height of 210 mm, and a width of 960 mm.
- the air in the room is sucked in from the suction opening 4 of the indoor unit 10, and is further sucked in from a suction opening of the scroll 6 in an axial direction.
- the air to which a dynamic pressure and a static pressure are applied by a cylindrical blade array rotated in the scroll 6 by means of the fan motor 2, is blown out from a discharge opening that is opening into an air path of the indoor unit 10.
- the air is heat-exchanged with the heat exchanger 3 installed in the air trunk, and is blown out from the blowing-out opening 5 into the room while being changed into cool air or warm air.
- Fig. 2 is a view illustrating a positional relationship between a center of the rotation shaft of the fan motor and a center of a bell mouth 9 in the first embodiment of the present invention.
- a point O denotes the center of the bell mouth 9 and a point P denotes the center of the rotation shaft of the fan motor 2 (a rotation center of the fan).
- the scroll 6 of the present first embodiment is provided with two straight line portions 12 and 13 that are approximately in parallel with each other on a whorl-like outer shape of the scroll 6, and the center of the rotation shaft 7 of the fan motor 2 is offset toward the straight line portion 12 situated nearer the tongue portion 8 of the scroll 6. That is, the rotation center P of the fan is offset relatively to the center O of the bell mouth 9 and the offset position is set to be nearer the straight line portion 12 situated nearer the tongue portion 8.
- Fig. 3 is a view illustrating a shape of the scroll in a second embodiment of the present invention.
- the center of the bell mouth 9 conforms to the rotation center of the fan motor 2 (in a case that offsetting amount is zero).
- the scroll 6 is provided with two straight line portions FH and EB that are approximately in parallel with each other on the whorl-like outer shape, and the shortest distance between the two straight line portions being approximately in parallel with each other is defined as CG, an intersecting point of a parallel line, which is in parallel with the straight line portions FH and EB of the scroll and passes through the center O of the bell mouth 9, and the outer shape of the scroll is defined as a point A, a point on the outer shape of the scroll, at which a distance between the outer shape of the scroll and the rotation center O of a fan is a maximum, is defined as a point B, intersecting points of a perpendicular line, which is perpendicular to the straight line portions FH and EB of the scroll and passes through the rotation center O of the fan, and the straight line portions FH and EB of the scroll are defined as a point C and a point G, respectively, a fan radius is defined as R, and an angle formed by a segment OA and a segment OB is defined as
- the (OC-R)/R is set to satisfy the formula of (OC-R)/R ⁇ 0.45.
- Fig. 4 is a perspective view showing a case that the fan body 11, the fan motor 2, and a motor-supporting stand 14 are assembled
- Fig. 5 is a perspective view showing a case that an airflow duct 15 is not formed in the motor-supporting stand 14
- Fig. 6 is a perspective view showing a case that the airflow duct 15 is formed in the motor-supporting stand 14.
- the constitution, in which the airflow duct 15 is provided in the motor-supporting stand 14 as described above, may be combined with the constitution of the above-described first embodiment or the second embodiment.
- Fig. 7 is a schematic perspective view illustrating a case where a rib 16 is provided at each of both ends of the tongue portion 8 of the scroll in the present embodiment
- Fig. 8 is a schematic side elevation thereof.
- the rib 16 takes a form of an approximately rectangular parallelepiped shape, and the following formula is satisfied: segment XY ⁇ segment XZ, where a point in the rib 16 most apart from the fan body 11 is defined as a point X, a point in a circular arc portion of the tongue portion 8 most apart from the fan body 11 is defined as a point Y, and a point in the rib 16 nearest to the fan body 11 is defined as a point Z.
- a velocity component that is perpendicular to a blowing-out opening 18 in a case where the rib 16 is absent is shown.
- a reverse flow area 20 indicated by a dashed line in the blowing-out opening 18 a flow toward an inner part of the fan from an outer part thereof is shown.
- stream lines, which are formed at a time when smoke is infused from, for example, a segment 21 on the suction opening 17, are shown, so as to prove a reverse flow phenomenon.
- the noise value and the number of revolutions can be reduced by providing a rib.
- the reason is that in a case where the rib is absent and a resistive element to the flow such as a heat exchanger or the like is present, the higher the draft resistance of the resistive element becomes, the more the reverse flow phenomenon, in which the airflow is headed toward the inner part of the fan from the blowing-out opening 18, occurs at the blowing-out opening 18 of the sirocco fan 1 as illustrated in Fig. 9 , and this becomes a cause of increasing the noise value and the number of revolutions. That is, as illustrated in Fig.
- an airflow blown out from gaps between the blades on a main plate side is headed toward both ends of the scroll along the scroll, and in the vicinity of both ends of the tongue portion 8, flows into a gap between the tongue portion 8 and the fan body 11, without flowing toward the blowing-out opening 18.
- the airflow further flows into the gaps between the blades, and is blown out from the gaps between the blades on the main plate side, so that a flow 22 blown out toward the outer part of the scroll is caused.
- the static pressure fluctuation on the wall surface is increased in the vicinity of both ends of the tongue portion, and a flow passing through the gaps between the blades many times is caused, and an air-blowing amount of the airflow that circulates in the inner part of the fan increases. Thereby, the air-blowing amount of the airflow passing through the gaps between the blades is also increased. This results in increasing the static pressure fluctuation on the blade surface, and increasing the noise value.
- the airflow blown out from the gaps between the blades on the main plate side is headed toward both ends of the scroll along the scroll.
- An air-flowing amount flowing into the gap between the tongue portion 8 and the fan body 11 in the vicinity of both ends of the tongue portion 8, without flowing toward the blowing-out opening 18 can be reduced.
- the noise value and the number of revolutions can be reduced as shown in Table 5.
- the constitution, in which the rib 16 of the present embodiment is provided may be combined with any one of the constitutions of the above-described first to third embodiment.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Air-Conditioning Room Units, And Self-Contained Units In General (AREA)
Description
- The present invention relates to a sirocco fan and an air-conditioning apparatus in which a noise is reduced and an air-blowing characteristic is improved.
- Hitherto, in a sirocco fan, a reverse flow phenomenon, in which a part of airflow that is blown out from a whorl-shaped scroll flows from an outer part of the sirocco fan to an inner part thereof occurs, is well known. When the reverse flow phenomenon occurs, since a reverse flow of air collides with a suction airflow, not only an air-blowing amount is reduced, but also a noise is increased. Therefore, it is devised that a shape of a bell mouth that forms a suction opening of the scroll is changed while dividing it into areas in circumferential directions so that such a reverse flow phenomenon is suppressed, or the like (for example, refer to Patent Document 1). Further, an example, in which an auxiliary tongue portion is provided in addition to a tongue portion, in a manner so as to protrude from the tongue portion, is also proposed (for example, refer to Patent Document 2).
- [Patent Document 1] Japanese Unexamined Patent Application Publication No.
9-126193 Pages 4 and 5,Fig. 1 andFig. 2 ) - [Patent Document 2] Japanese Unexamined Patent Application Publication No.
2006-138268 Fig. 1 andFig. 3 ) -
JP H11 324992 A - In the mean time, in the air-conditioning apparatus on which the hitherto known sirocco fan is mounted, there have been problems such as that, since an air-blowing amount of air blown out from the sirocco fan at a predetermined noise value is small and performance of a heat exchanger is lowered, a load of a compressor is increased and a COP (coefficient of performance) is lowered. In addition, if the air-blowing amount of the air blown out from the sirocco fan is increased in order to suppress the lowering of the COP, the noise value is increased and an uncomfortable feeling is given to a user.
- In light of the above-described problems, an object of the present invention is to provide a sirocco fan capable of obtaining a large air-blowing amount at a time of a predetermined noise occurrence, in other words, to provide a sirocco fan capable of reducing a noise value and a number of revolutions of the sirocco fan, when obtaining a predetermined air-blowing amount, and the air-conditioning apparatus provided with the sirocco fan.
- Further, another object of the present invention is to suppress a reverse flow phenomenon by devising a shape of a scroll, and thereby reducing the noise value while keeping the predetermined air-blowing amount.
- According to the present invention there is provided a sirocco fan as specified in the claims.
- According to the present invention, in the sirocco fan including a scroll, a fan body that is rotatably disposed in the scroll and includes a large number of blades arranged in a cylindrical manner, and a motor for rotationally driving the fan body, the scroll includes two straight line portions being approximately in parallel with each other on a whorl-like outer shape thereof, and a rotation shaft of the motor is positioned nearer to one of the two straight line portions, which is situated nearer a tongue portion of the scroll. Thereby, the air-blowing amount at a time of a predetermined noise occurrence can be increased and in a case of an air-conditioning apparatus, a COP can be improved.
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Fig. 1 is composed of a schematic plan view (a) and a schematic side elevation (b) illustrating an internal construction of an indoor unit of an air-conditioning apparatus provided with a sirocco fan in a first embodiment according to the present invention. -
Fig. 2 is view illustrating a positional relationship between a center of a bell mouth and a center of a rotation shaft in the first embodiment. -
Fig. 3 is a view illustrating a scroll shape in a second embodiment. -
Fig. 4 is a perspective view showing an assembled body of a motor-supporting stand, a fan motor, and a fan body in a third embodiment. -
Fig. 5 is a perspective view showing the motor-supporting stand inFig. 4 . -
Fig. 6 is a perspective view showing a case that an airflow duct is provided in the motor-supporting stand. -
Fig. 7 is a schematic view illustrating a case that a rib is provided at both ends of a tongue portion of the scroll in a fourth embodiment. -
Fig. 8 is a schematic side elevation illustrating a rib ofFig. 7 . -
Fig. 9 is a view illustrating a velocity distribution in a blowing-out opening of the sirocco fan. -
Fig. 10 is a view illustrating a reverse flow phenomenon in the blowing-out opening of the sirocco fan. -
- 1:
- sirocco fan
- 2:
- fan motor
- 3:
- heat exchanger
- 4:
- suction opening
- 5:
- blowing-out opening
- 6:
- scroll
- 7:
- rotation shaft
- 8:
- tongue portion
- 9:
- bell mouth
- 10:
- indoor unit
- 11:
- fan body
- 12:
- straight line portion
- 13:
- straight line portion
- 14:
- motor-supporting stand
- 15:
- airflow duct
- 16:
- rib
- 17:
- suction opening
- 18:
- blowing-out opening
- 20:
- reverse flow area
- 22:
- flow
- Hereinbelow, an embodiment of the present invention will be described with reference to the drawings.
-
Fig. 1 is composed of a schematic plan view (a) and a schematic side elevation (b) illustrating an inner construction of an indoor unit of an air-conditioning apparatus provided with a sirocco fan in a first embodiment according to the present invention. - In
Fig. 1 , areference numeral 10 denotes an indoor unit constituting an indoor air-conditioning apparatus, and is provided with a pair of sirocco fans 1 and 1, afan motor 2 that rotationally drives these sirocco fans 1 and 1 simultaneously, and aheat exchanger 3 that performs a heat-exchanging operation with air that is blown out from the sirocco fan 1. The sirocco fan 1 is provided with a whorl-shapedscroll 6, and a fan body including a large number of blades that are rotatably disposed in thescroll 6 and arranged in a cylindrical manner. In the drawing, a reference numeral 4 denotes a suction opening for the air, areference numeral 5 denotes a blowing-out opening for cool air or warm air, areference numeral 7 denotes a rotation shaft of thefan motor 2 and areference numeral 8 denotes a tongue portion. - The aforementioned
indoor unit 10 is provided with a refrigerating circuit for a refrigerant, which is composed of a compressor, a condenser, an expansion valve, and an evaporator, all of which are not illustrated, and is configured to perform a cooling operation, a heating operation, or the like in a room. Further, an example of specifications in the present first embodiment is as follows: the sirocco fan 1 is configured to have a fan-diameter ϕ of 160 mm, a width dimension of 190 mm, the number of the blades of 40, and theheat exchanger 3 is provided with a heat transmission pipe of 12 steps, and an array pitch of the heat transmission pipe is 12.7 mm and a step pitch thereof is 20.4 mm, a length in an axial direction of the heat transmission pipe is 700 mm, and a draft resistance ΔP1 is 23.1 V1.3 [Pa] (V: velocity[m/s]). Furthermore, theindoor unit 10 is configured to have a depth of 680 mm, a height of 210 mm, and a width of 960 mm. - The air in the room is sucked in from the suction opening 4 of the
indoor unit 10, and is further sucked in from a suction opening of thescroll 6 in an axial direction. The air, to which a dynamic pressure and a static pressure are applied by a cylindrical blade array rotated in thescroll 6 by means of thefan motor 2, is blown out from a discharge opening that is opening into an air path of theindoor unit 10. The air is heat-exchanged with theheat exchanger 3 installed in the air trunk, and is blown out from the blowing-outopening 5 into the room while being changed into cool air or warm air. -
Fig. 2 is a view illustrating a positional relationship between a center of the rotation shaft of the fan motor and a center of abell mouth 9 in the first embodiment of the present invention. A point O denotes the center of thebell mouth 9 and a point P denotes the center of the rotation shaft of the fan motor 2 (a rotation center of the fan). - The
scroll 6 of the present first embodiment is provided with twostraight line portions scroll 6, and the center of therotation shaft 7 of thefan motor 2 is offset toward thestraight line portion 12 situated nearer thetongue portion 8 of thescroll 6. That is, the rotation center P of the fan is offset relatively to the center O of thebell mouth 9 and the offset position is set to be nearer thestraight line portion 12 situated nearer thetongue portion 8. - In Table 1, a noise value and a number of revolutions, under the conditions that an air-blowing amount of air blown out from the indoor unit is 16 m3/min and a length OP is set to be 0 mm and 2 mm, are shown.
-
Table 1 Noise Value and Number of Revolutions at 16 m3/min Length OP 0 mm 2 mm Noise Value (dB) 45.8 45.3 Number of Revolutions (rpm) 1103 1092 - According to Table 1, it is found that when the length OP is set to be 2 mm, the noise valve and the number of revolutions can be reduced.
- Next, the reason of this result will be explained. In Table 2, a maximum air-blowing amount between the blades, under the conditions that the length OP is set to be 0 mm and the number of revolutions is 1103 rpm, and that the length OP is set to be 2 mm and the number of revolutions is 1092 rpm, are shown. Incidentally, the air-blowing amount is 16 m3/min in both conditions.
-
Table 2 Maximum Air-Blowing Amount between Blades at 16 m3/min Length OP 0 mm 2 mm Maximum Air-Blowing Amount between Blades (at 16 m3/min) 0.682 0.661 - According to Table 2, it is found that the maximum air-blowing amount between the blades at the length OP of 2 mm is smaller. A sound pressure energy is proportional to the sixth power of velocity, and the noise value is expressed by the following mathematical formula:
-
Fig. 3 is a view illustrating a shape of the scroll in a second embodiment of the present invention. Incidentally, in the present embodiment, the center of thebell mouth 9 conforms to the rotation center of the fan motor 2 (in a case that offsetting amount is zero). - The
scroll 6 is provided with two straight line portions FH and EB that are approximately in parallel with each other on the whorl-like outer shape, and the shortest distance between the two straight line portions being approximately in parallel with each other is defined as CG, an intersecting point of a parallel line, which is in parallel with the straight line portions FH and EB of the scroll and passes through the center O of thebell mouth 9, and the outer shape of the scroll is defined as a point A, a point on the outer shape of the scroll, at which a distance between the outer shape of the scroll and the rotation center O of a fan is a maximum, is defined as a point B, intersecting points of a perpendicular line, which is perpendicular to the straight line portions FH and EB of the scroll and passes through the rotation center O of the fan, and the straight line portions FH and EB of the scroll are defined as a point C and a point G, respectively, a fan radius is defined as R, and an angle formed by a segment OA and a segment OB is defined as θ. - As a curve FGHABCE illustrating a hitherto known scroll shape is formed of a logarithmic spiral and an 2R/CG is about 0.68, the fan diameter is small compared with that in the case of the present embodiment whose R/CG is set to satisfy the formula of 0.72 ≤ 2R/CG ≤ 0.82. Therefore, the number of revolutions required to obtain a predetermined air-blowing amount is increased.
- On the other hand, when the R/CG is increased, the number of revolutions required to obtain the predetermined air-blowing amount is reduced, but a segment EB comes closer to the fan, so that the air-blowing amount is concentrated on a space between the blades that are close to the segment EB. This results in increasing the noise value.
- Consequently, when the R/CG is increased and a curve AB is spaced apart from the fan relatively to the logarithmic spiral, the air-blowing amount between the blades in the vicinity of the curve AB is increased and the air-blowing amount between the blades in the vicinity of the segment EB is reduced by just that much.
- In Table 3, the noise value and the number of revolutions at the air-blowing amount of 16 m3/min of the air blown out from the indoor unit, in a case where the 2R/CG is 0.68 in the hitherto known scroll shape (CASE 1), and a case where the conditions of 2R/CG = 0.76, (OC-R)/R = 0.375, and the θ = 60° (CASE 2) are satisfied, are shown.
-
Table 3 Noise Value and Number of Revolutions at 16 m3/min Case 1 Case 2Noise Value (dB) 45.3 44.1 Number of Revolutions (rpm) 1092 1056 - As shown in Table 3, the sirocco fan in the present embodiment including the scroll shape whose condition is set as 2R/CG = 0.76, (OC-R)/R = 0.375, and θ = 60° can reduce the noise value and the number of revolutions compared with the hitherto known sirocco fan having the scroll shape formed of the logarithmic spiral, by increasing the R/CG and keeping the curve AB away from the fan.
- Incidentally, as for an upper limit value of the (OC-R)/R, when a distance between the straight line portion EB of the
scroll 6 and an outer circumferential end of the fan becomes 0.45 or more, the air-blowing amount is reduced and the noise value is increased. Therefore, the (OC-R)/R is set to satisfy the formula of (OC-R)/R ≤ 0.45. -
Fig. 4 is a perspective view showing a case that thefan body 11, thefan motor 2, and a motor-supportingstand 14 are assembled,Fig. 5 is a perspective view showing a case that anairflow duct 15 is not formed in the motor-supportingstand 14, andFig. 6 is a perspective view showing a case that theairflow duct 15 is formed in the motor-supportingstand 14. - Further, in Table 4, the noise value and the number of revolutions at the air-blowing amount of 16 m3/min of the air blown out from the indoor unit, in a case where the airflow duct is present in the motor-supporting stand and a case where the airflow duct is absent therein, are shown.
-
Table 4 Noise Value and Number of Revolutions at 16 m3/min Airflow Orifice of Motor-Supporting stand Present Absent Noise Value (dB) 44.8 45.3 Number of Revolutions (rpm) 1091 1092 - According to Table 4, it is found that although the number of revolutions is hardly changed, the noise value is reduced more in the case that the
airflow duct 15 is present in the motor-supportingstand 14. The reason is that although a static pressure fluctuation generated from the fan is transmitted to the motor-supportingstand 14 and thereby the static pressure fluctuation is generated on a wall surface of the motor-supportingstand 14 and the noise is generated in the case where theairflow duct 15 is absent in the motor-supportingstand 14, the static pressure fluctuation generated from the fan mutually counteract in a space in the vicinity of the motor-supportingstand 14 in the case where theairflow duct 15 is present in the motor-supportingstand 14, and thereby the static pressure fluctuation on the wall surface of the motor-supportingstand 14 is suppressed. - Further, it is found that there is no change in a suction space of the sirocco fan 1 even when the
airflow duct 15 is provided in the motor-supportingstand 14, because the number of revolutions is hardly changed. Incidentally, the constitution, in which theairflow duct 15 is provided in the motor-supportingstand 14 as described above, may be combined with the constitution of the above-described first embodiment or the second embodiment. -
Fig. 7 is a schematic perspective view illustrating a case where arib 16 is provided at each of both ends of thetongue portion 8 of the scroll in the present embodiment, andFig. 8 is a schematic side elevation thereof. - The
rib 16 takes a form of an approximately rectangular parallelepiped shape, and the following formula is satisfied: segment XY ≤ segment XZ, where a point in therib 16 most apart from thefan body 11 is defined as a point X, a point in a circular arc portion of thetongue portion 8 most apart from thefan body 11 is defined as a point Y, and a point in therib 16 nearest to thefan body 11 is defined as a point Z. - Furthermore, in
Fig. 9 , a velocity component that is perpendicular to a blowing-outopening 18 in a case where therib 16 is absent is shown. InFig. 9 , areverse flow area 20 indicated by a dashed line in the blowing-out opening 18 a flow toward an inner part of the fan from an outer part thereof is shown. InFig. 10 , stream lines, which are formed at a time when smoke is infused from, for example, asegment 21 on thesuction opening 17, are shown, so as to prove a reverse flow phenomenon. - In Table 5, the noise value and the number of revolutions at the air-blowing amount of 16 m3/min of the air blown out from the
indoor unit 10 in a case where the rib is present and a case where the rib is absent are shown. -
Table 5 Noise Value and Number of Revolutions at 16 m3/min Rib Present Absent Noise Value (dB) 44.4 45.3 Number of Revolutions (rpm) 1077 1092 - As shown in Table 5, the noise value and the number of revolutions can be reduced by providing a rib. The reason is that in a case where the rib is absent and a resistive element to the flow such as a heat exchanger or the like is present, the higher the draft resistance of the resistive element becomes, the more the reverse flow phenomenon, in which the airflow is headed toward the inner part of the fan from the blowing-out
opening 18, occurs at the blowing-outopening 18 of the sirocco fan 1 as illustrated inFig. 9 , and this becomes a cause of increasing the noise value and the number of revolutions. That is, as illustrated inFig. 10 , an airflow blown out from gaps between the blades on a main plate side is headed toward both ends of the scroll along the scroll, and in the vicinity of both ends of thetongue portion 8, flows into a gap between thetongue portion 8 and thefan body 11, without flowing toward the blowing-outopening 18. The airflow further flows into the gaps between the blades, and is blown out from the gaps between the blades on the main plate side, so that aflow 22 blown out toward the outer part of the scroll is caused. When such a flow is caused, the static pressure fluctuation on the wall surface is increased in the vicinity of both ends of the tongue portion, and a flow passing through the gaps between the blades many times is caused, and an air-blowing amount of the airflow that circulates in the inner part of the fan increases. Thereby, the air-blowing amount of the airflow passing through the gaps between the blades is also increased. This results in increasing the static pressure fluctuation on the blade surface, and increasing the noise value. - On the other hand, in a case where the
rib 16 is present, the airflow blown out from the gaps between the blades on the main plate side is headed toward both ends of the scroll along the scroll. An air-flowing amount flowing into the gap between thetongue portion 8 and thefan body 11 in the vicinity of both ends of thetongue portion 8, without flowing toward the blowing-outopening 18 can be reduced. Thereby, compared with the case where the rib is absent, the noise value and the number of revolutions can be reduced as shown in Table 5. Incidentally, it is appropriate for therib 16 to have a width in the range from 5 to 10 mm. Further, the constitution, in which therib 16 of the present embodiment is provided, may be combined with any one of the constitutions of the above-described first to third embodiment.
Claims (3)
- A sirocco fan including:a scroll (6);a fan body (11) that is rotatably disposed in the scroll (6) and includes a plurality of blades arranged in a cylindrical manner; anda motor (2) for rotationally driving the fan body (11), characterized in thata rib (16) having a width in a range from 5 to 10 mm taking a form of a substantially rectangular parallelepiped shape is provided along both ends of a tongue portion (8) of the scroll (6).
- The sirocco fan according to claim 1, wherein
a following formula is satisfied: segment XY ≤ segment XZ, where a point in the rib (16) most apart from the fan body (11) is defined as a point X, a point in a circular arc portion of the tongue portion (8) most apart from the fan body (11) is defined as a point Y, and a point in the rib (16) nearest to the fan body (11) is defined as a point Z. - An air-conditioning apparatus comprising a sirocco fan according to claim 1 or 2.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007081325A JP4906555B2 (en) | 2007-03-27 | 2007-03-27 | Sirocco fan and air conditioner |
EP08722743.5A EP2128451B1 (en) | 2007-03-27 | 2008-03-25 | Sirocco fan and air conditioner |
PCT/JP2008/055477 WO2008123208A1 (en) | 2007-03-27 | 2008-03-25 | Sirocco fan and air conditioner |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08722743.5A Division EP2128451B1 (en) | 2007-03-27 | 2008-03-25 | Sirocco fan and air conditioner |
EP08722743.5A Division-Into EP2128451B1 (en) | 2007-03-27 | 2008-03-25 | Sirocco fan and air conditioner |
Publications (3)
Publication Number | Publication Date |
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EP2757268A2 EP2757268A2 (en) | 2014-07-23 |
EP2757268A3 EP2757268A3 (en) | 2016-11-16 |
EP2757268B1 true EP2757268B1 (en) | 2019-08-07 |
Family
ID=39830703
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Application Number | Title | Priority Date | Filing Date |
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EP14164771.9A Active EP2757268B1 (en) | 2007-03-27 | 2008-03-25 | Scirocco fan and air-conditioning apparatus |
EP08722743.5A Active EP2128451B1 (en) | 2007-03-27 | 2008-03-25 | Sirocco fan and air conditioner |
EP14164774.3A Active EP2757269B1 (en) | 2007-03-27 | 2008-03-25 | Scirocco fan and air-conditioning apparatus |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
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EP08722743.5A Active EP2128451B1 (en) | 2007-03-27 | 2008-03-25 | Sirocco fan and air conditioner |
EP14164774.3A Active EP2757269B1 (en) | 2007-03-27 | 2008-03-25 | Scirocco fan and air-conditioning apparatus |
Country Status (9)
Country | Link |
---|---|
EP (3) | EP2757268B1 (en) |
JP (1) | JP4906555B2 (en) |
KR (1) | KR101179805B1 (en) |
CN (1) | CN101595310B (en) |
AU (1) | AU2008236109C1 (en) |
ES (3) | ES2625932T3 (en) |
HK (1) | HK1135160A1 (en) |
TW (1) | TW200916663A (en) |
WO (1) | WO2008123208A1 (en) |
Families Citing this family (14)
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CN102865248B (en) * | 2011-07-06 | 2015-05-13 | 珠海格力电器股份有限公司 | Air conditioner volute and air conditioner with same |
KR101698788B1 (en) | 2011-10-17 | 2017-01-23 | 엘지전자 주식회사 | Sirocco fan and Air condtioner having the same |
US9039363B2 (en) * | 2012-06-22 | 2015-05-26 | Trane International Inc. | Blower housing |
JP6425325B2 (en) * | 2012-12-26 | 2018-11-21 | 新晃工業株式会社 | Guide plate of plug fan in air conditioner |
WO2016139732A1 (en) * | 2015-03-02 | 2016-09-09 | 三菱電機株式会社 | Sirocco fan and indoor unit of air conditioner using this sirocco fan |
CN107477677B (en) * | 2017-08-25 | 2023-06-06 | 重庆凌达压缩机有限公司 | Air conditioner indoor unit and air conditioner |
WO2019082392A1 (en) * | 2017-10-27 | 2019-05-02 | 三菱電機株式会社 | Centrifugal blower, air blower device, air conditioning device, and refrigeration cycle device |
ES2973907T3 (en) | 2017-10-31 | 2024-06-24 | Mitsubishi Electric Corp | Centrifugal blower, blowing device, air conditioner and refrigeration cycle device |
CN107832261B (en) * | 2017-11-02 | 2020-09-29 | 华东交通大学 | Wavelet transform-based non-stationary exhaust noise signal order quantitative extraction method |
EP3530956B1 (en) | 2018-02-26 | 2021-09-22 | Honeywell Technologies Sarl | Impeller for a radial fan and gas burner appliance |
EP3798452A4 (en) * | 2018-05-21 | 2021-05-12 | Mitsubishi Electric Corporation | Centrifugal air blower, air blowing device, air conditioning device, and refrigeration cycle device |
AU2018453648B2 (en) * | 2018-12-19 | 2022-10-06 | Mitsubishi Electric Corporation | Centrifugal fan, air-sending device, air-conditioning apparatus, and refrigeration cycle apparatus |
KR20210011699A (en) | 2019-07-23 | 2021-02-02 | 삼성전자주식회사 | Clothes care apparatus |
CN116457583A (en) * | 2020-11-27 | 2023-07-18 | 三菱电机株式会社 | Air conditioner |
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JPS60153900A (en) * | 1984-01-21 | 1985-08-13 | 山野 陸三 | Dehydration and drying apparatus for washed article |
JPS6480698A (en) * | 1987-09-24 | 1989-03-27 | Tokyo Gas Co Ltd | Automatic supply and recovery device for pipe |
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JP2005273593A (en) * | 2004-03-26 | 2005-10-06 | Nippon Densan Corp | Centrifugal fan |
KR100591335B1 (en) * | 2004-06-16 | 2006-06-19 | 엘지전자 주식회사 | Centrifugal fan |
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2008
- 2008-03-25 AU AU2008236109A patent/AU2008236109C1/en active Active
- 2008-03-25 ES ES08722743.5T patent/ES2625932T3/en active Active
- 2008-03-25 CN CN200880002818XA patent/CN101595310B/en active Active
- 2008-03-25 ES ES14164774T patent/ES2749113T3/en active Active
- 2008-03-25 WO PCT/JP2008/055477 patent/WO2008123208A1/en active Application Filing
- 2008-03-25 KR KR1020097014245A patent/KR101179805B1/en active IP Right Grant
- 2008-03-25 EP EP14164771.9A patent/EP2757268B1/en active Active
- 2008-03-25 EP EP08722743.5A patent/EP2128451B1/en active Active
- 2008-03-25 EP EP14164774.3A patent/EP2757269B1/en active Active
- 2008-03-25 ES ES14164771T patent/ES2744990T3/en active Active
- 2008-03-26 TW TW097110727A patent/TW200916663A/en unknown
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Also Published As
Publication number | Publication date |
---|---|
EP2128451A1 (en) | 2009-12-02 |
EP2757269A3 (en) | 2016-11-16 |
EP2128451A4 (en) | 2014-01-15 |
TW200916663A (en) | 2009-04-16 |
EP2757268A2 (en) | 2014-07-23 |
WO2008123208A1 (en) | 2008-10-16 |
AU2008236109A1 (en) | 2008-10-16 |
AU2008236109C1 (en) | 2011-10-13 |
ES2744990T3 (en) | 2020-02-27 |
AU2008236109B2 (en) | 2011-01-27 |
JP4906555B2 (en) | 2012-03-28 |
EP2757269B1 (en) | 2019-09-04 |
TWI352780B (en) | 2011-11-21 |
KR20090088440A (en) | 2009-08-19 |
HK1135160A1 (en) | 2010-05-28 |
CN101595310A (en) | 2009-12-02 |
JP2008240612A (en) | 2008-10-09 |
ES2625932T3 (en) | 2017-07-21 |
EP2128451B1 (en) | 2017-04-19 |
CN101595310B (en) | 2013-09-18 |
EP2757269A2 (en) | 2014-07-23 |
KR101179805B1 (en) | 2012-09-04 |
EP2757268A3 (en) | 2016-11-16 |
ES2749113T3 (en) | 2020-03-19 |
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