EP1780475A2 - Crossflow fan - Google Patents
Crossflow fan Download PDFInfo
- Publication number
- EP1780475A2 EP1780475A2 EP06022505A EP06022505A EP1780475A2 EP 1780475 A2 EP1780475 A2 EP 1780475A2 EP 06022505 A EP06022505 A EP 06022505A EP 06022505 A EP06022505 A EP 06022505A EP 1780475 A2 EP1780475 A2 EP 1780475A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- slits
- impeller
- crossflow fan
- rotating shaft
- circumferential direction
- 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
- 230000002596 correlated effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241001274961 Rubus repens Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Images
Classifications
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- 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
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- 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
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- 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
- F24F1/0025—Cross-flow or tangential fans
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- 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
- 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
Definitions
- the present invention relates to a crossflow fan used in an air conditioner or the like.
- a distance between a fan rotor (impeller) and a tongue is preferably shortened to improve efficiency thereof, the tongue provided at a predetermined height along the outer diameter of the fan rotor.
- the flow of air around the blade rapidly varies, thereby increasing noise in a termination region of the tongue region.
- a comb-shaped groove portion is provided at the upper end of the tongue.
- the width thereof is enlarged, and the depth thereof is changed between the right and left rotors of the fan rotor (for example, refer to Japanese Patent No. 3248466 (pages 2 and 3, and Fig. 3)).
- a crossflow fan in which the efficiency is high while reducing noise.
- a crossflow fan includes: an impeller; and a tongue provided along a portion of the outer circumference of the impeller.
- the tongue is provided with a plurality of slits such that a cross-section of the tongue on a surface perpendicular to a circumferential direction of the impeller is formed in a comb shape. At least one slit of the plurality of slits is formed in a different shape.
- Fig. 1 is a sectional view illustrating an air conditioner using a crossflow fan according to a first embodiment of the present invention.
- the same reference numeral represents the same component or a component corresponding thereto, which is common in the overall specification.
- the shapes of components represented in the overall specification are only examples, and are not limited thereto.
- a front-side suction grille 2 is provided on the front surface of a housing 1 of the air conditioner, and an upper-side suction grille 3 is provided on the upper surface thereof.
- a filter 4 for removing dust contained in the air is provided along the front-side suction grille 2 and the upper-side suction grille 3.
- a nose 6 is installed so as to be connected to the front-side suction grille 2.
- a guider 7 is installed, which introduces the flow of air within the air conditioner.
- an impeller 12 is disposed which rotates around a rotating shaft 13 of the crossflow fan.
- the impeller 12 is composed of the rotating shaft 13, a plurality of disc-shaped side plates 14 fixed to both ends and the middle of the rotating shaft 13, and impeller blades 15 radially fixed to the outer circumferences of the side plates 14.
- the crossflow fan is provided with the impeller 12, the guider 7, and the nose 6.
- an air outlet 8 is provided between the nose 6 and.the guider 7, through which air is blown outside the air conditioner.
- a left-to-right wind direction changing plate 9 connected to the nose 6 is provided which changes the flow of air in a direction of the rotating shaft 13, and similarly, in the vicinity of the outlet 8, an up-and-down wind direction changing plate 10 is provided which changes the flow of air in the up and down direction.
- piping 11 is disposed in which a refrigerant of the heat exchanger 5 flows.
- Fig. 2 is a sectional view illustrating the nose of the crossflow fan according to the first embodiment of the invention
- Fig. 3 is a perspective view of the nose of the crossflow fan according to the first embodiment of the invention.
- Fig. 2A is a sectional view of the nose on a surface perpendicular to the rotating shaft of the crossflow fan according to the first embodiment of the invention
- Fig. 2B is a sectional view of the nose on a surface (a surface including the rotating shaft 13 of the impeller 12, that is, a cross-sectional surface taken along line E-E of Fig. 2A) perpendicular to a circumferential direction of the impeller of the crossflow fan according to the first embodiment of the invention.
- the nose 6 is provided with an air passage constituting portion 17 and a tongue 18.
- the air passage constituting portion 17 constitutes a portion of an air passage inside the air conditioner and serves as a drain which receives water droplets dripping from the heat exchanger 5 so as to be discharged.
- a plurality of concave slits 21 are arranged in the direction of the rotating shaft 13 of the impeller 12 such that the tongue 18 is formed in a comb shape.
- the cross-section of the tongue 18 on a surface (a surface including the rotating shaft 13 of the impeller 12, that is, a cross-sectional surface taken along line E-E of Fig. 2A) perpendicular to a circumferential direction of the impeller 12 has a plurality of convex portions which are connected to a base and on the same side of the corresponding base.
- Some slits 21 among the plurality of slits 21 are formed in a different shape, and have a different depth H in a radius direction of the impeller 12 at the discharge side A.
- the remaining slits 21 are formed to have the same shape and same depth H in a radius direction of the impeller 12 in the discharge side A.
- the depths H of some slits 21 may be changed irregularly or regularly in the discharge side A.
- all the slits 21 do not necessarily need to be formed to have a different shape. However, at least some slits 21 among the plurality of slits 21 may be formed to have a different shape and may have a different depth H in the radius direction of the impeller 12 at the discharge side A. Further, all the slits 21 may be formed in a different shape and the depths H thereof in the radius direction of the impeller 12 in the discharge side A may differ from each other. In all the slits 21, respective lengths L in a circumferential direction of the impeller 12, widths D in the direction of the rotating shaft 13, and distances T between the adjacent slits 21 are identical.
- the tongue 18 is provided with the plurality of slits 21 such that the cross-section of the tongue 18 on a surface perpendicular to the circumferential direction of the impeller 12 is formed in a comb shape. Further, at least some slits 21 among the plurality of slits 21 have a different depth H in the radius direction of the impeller 12. Therefore, it is possible to change a pressure loss in each of the slits 21 and to change the flow rate and the direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B for each position of the slits 21.
- an interference position between leakage flow and the impeller blade 15 differs in each of the slits 21, an area correlated with pressure fluccuation (an area of a region having synchronism) can be reduced, and noise of the crossflow fan can be reduced while efficiency is maintained.
- the crossflow fan In the crossflow fan, a flow rate is reduced in the vicinities of the side plates 14 provided at both ends in a direction of the rotating shaft 13 of the impeller 12 and in the middle thereof.
- a leakage flow rate is large in the low flow rate region, a reverse flow easily occurs, thereby decreasing efficiency. Therefore, the slits 21, in which the depths H at the discharge side A are small, are provided in the low flow rate region flowing through the impeller 12, and the slits 21, in which the depths H at the discharge side A are large, are provided in a high flow rate region. Then, it is possible to provide a crossflow fan without reducing efficiency caused by a reverse flow and without increasing noise in any position in the direction of the rotating shaft 13 of the impeller 12.
- the depths H of the slits 21 at the discharge side A may be decreased in the vicinities of the side plates 14 provided at both ends and the middle of the rotating shaft 13 of the impeller 12, and the depths H of the slits 21 at the discharge side A may be increased in other regions.
- Fig. 4 is a sectional view of the nose on a surface perpendicular to the circumferential direction of the impeller of the crossflow fan according to the first embodiment of the invention.
- the slits 21 have been illustrated, of which the cross sections on a surface perpendicular to the circumferential direction of the impeller 12 are formed in a rectangular shape.
- the cross-sections of the slits 21 may be formed in any shape. That is, the cross-sectional surfaces of the slits 21 may be formed in a triangle shape shown in Fig. 4A or in a trapezoidal shape shown in Fig. 4B. Further, plural types of cross-sectional shapes may be combined.
- the cross-section on a surface perpendicular to the radius direction of the impeller may be formed in any shape. That is, the cross-section may be formed in a rectangular shape, a triangle shape, or a trapezoidal shape. Further, plural types of cross-sectional shapes may be combined. When plural types of cross-sectional shapes are combined, a pressure loss of each slit 21 may be changed.
- the lengths L in the circumferential direction of the impeller 12, the widths D in the direction of the rotating shaft 13, and the distances T between the adjacent slits 21 are set to be respectively identical in all of the slits 21.
- the lengths L in a circumferential direction of the impeller 12, the widths D in the direction of the rotating shaft 13, and the.distances T between the adjacent slits 21 may differ from each other.
- the air conditioner using the crossflow fan in which at least some slits among the plurality of slits have a different depth H in the radius direction of the impeller 12 is shown.
- an air conditioner using a crossflow fan in which at least some slits among a plurality of slits have a different length L in a circumferential direction of the impeller 12 is shown.
- Fig. 5 is a sectional view of a nose on a surface perpendicular to a rotating shaft of the crossflow fan according to the second embodiment of the invention
- Fig. 6 is a perspective view of the nose of the crossflow fan according to the second embodiment of the invention.
- a tongue 18 has a plurality of slits 22 arranged in a direction of the rotating shaft 13 of the impeller 12 such that the cross-section of the tongue 18 on a surface (including the rotating shaft 13 of the impeller 12) perpendicular to the circumferential direction of the impeller 12 is formed in a comb shape.
- Some slits 22 among the plurality of slits 22 are formed in a different shape and have a different length L in the circumferential direction of the impeller 12.
- the remaining slits 22 are formed in the same shape and have an identical length L in the circumferential direction of the impeller 12.
- all of the slits 22 can have the same shape, but at least some of the slits 22 among the plurality of slits 22 may be formed to have a different shape and a different length L in the circumferential direction of the impeller 12. Further, all the slits 22 may be formed to have a different shape from each other, and the lengths L thereof in the circumferential direction of the impeller 12 may differ from each other in all the slits 22. Moreover, in all the slits 22, respective depths H in the radius direction of the impeller 12, widths D in the direction of the rotating shaft 13, and distances T between the adjacent slits 22 are identical.
- the tongue 18 is provided with the plurality of slits 22 such that the cross-section thereof on a surface perpendicular to the circumferential direction of the impeller 12 is formed in a comb shape, and at least some slits 22 among the plurality of slits 22 have a different length L in the circumferential direction of the impeller 12. Therefore, by changing the length, a pressure loss in each of the slits 22 can be changed, and a flow rate and direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B can be different for each position of the slits 22.
- an interference position between leakage flow and the impeller blade 15 differs in each of the slits 22, an area correlated with pressure fluctuation (an area of a region having synchronism) can be reduced, and noise of the crossflow fan can be reduced while efficiency is maintained.
- Fig. 7 is a perspective view of the nose of the crossflow fan according to the second embodiment.
- the lengths L of the slits 22 in the circumferential direction of the impeller 12 are irregularly changed in the direction of the rotating shaft 13.
- the lengths L of the slits 22 in the circumferential direction of the impeller 12 are regularly changed as shown in Fig. 7, it is possible to obtain the same effect as the lengths L are irregularly changed.
- the depths H in the radius direction of the impeller 12, the widths D in the direction of the rotating shaft 13, and the distances T between the adjacent slits 22 are set to be respectively identical in all of the slits 22.
- the depths H in the radius direction of the impeller 12, the widths D in the direction of the rotating shaft 13, and the distances T between the adjacent slits 22 may respectively differ.
- the air conditioner using the crossflow fan in which at least some slits among the plurality of slits have a different depth H in the radius direction of the impeller 12 is shown.
- an air conditioner using a crossflow fan in which at least some slits among a plurality of slits have a different width D in a direction of the rotating shaft 13 of the impeller 12 is shown.
- Fig. 8 is a perspective view illustrating a nose of the crossflow fan according to the third embodiment of the invention.
- a tongue 18 has a plurality of slits 23 arranged in a direction of the rotating shaft 13 of the impeller 12 such that the cross-section of the tongue 18 on a surface (including the rotating shaft 13 of the impeller 12) perpendicular to the circumferential direction of the impeller 12 is formed in a comb shape.
- Some slits 23 among the plurality of slits 23 are formed to have a different shape and a different width D in the direction of the rotating shaft 13 of the impeller 12.
- the remaining slits 23 are formed to have the same shape and an identical width D in the direction of the rotating shaft 13 of the impeller 12.
- all of the slits 23 can be formed in the same shape, but at least some slits 23 among the plurality of slits 23 may be formed to have a different shape and may have a different width D in the direction of the rotating shaft 13 of the impeller 12. Further, all the slits 23 may be formed to have a different shape from each other, and the widths D in the direction of the rotating shaft 13 of the impeller 12 may differ from each other in all of the slits 23. In all of the slits 23, the depths H in the radius direction of the impeller 12, the lengths L in the circumferential direction thereof, and the distances T between the adjacent slits 23 are respectively identical.
- the tongue 18 is provided with the plurality of slits 23 such that the cross-section of the tongue 18 on a surface perpendicular to the circumferential direction of the impeller 12 is formed in a comb shape, and at least some slits 23 among the plurality of slits 23 have a different width D in the direction of the rotating shaft 13 of the impeller 12. Therefore, a pressure loss in each of the slits 23 can be changed, and a flow rate and direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B can he different for each position of the slits 23.
- an interference position between the leakage flow and the impeller blade 15 differs in each of the slits 23
- an area correlated with pressure fluctuation an area of a region having synchronism
- the thickness of a material composing the tongue 18 is uniform, as compared with the crossflow fans shown in the first and second embodiments. Therefore, it is possible to easily mold the crossflow fan.
- the widths D of the slits 23 in the direction of the rotating shaft 13 are irregularly changed as shown in Fig. 8.
- the widths D of the slits 23 in the direction of the rotating shaft 13 are regularly changed in the direction of the rotating shaft 13, it is possible to obtain the same effect as the widths that are irregularly changed.
- the depths H in the radius direction of the impeller 12, the lengths L in the circumferential direction, and the distances T between the adjacent slits 23 are set to be respectively identical in all of the slits 23.
- the depths H in the radius direction of the impeller 12, the lengths L in the circumferential direction, and the distances T between the adjacent slits 23 may respectively differ.
- the air conditioner using the crossflow fan in which at least some slits among the plurality of slits have a different depth H in a radius direction of the impeller 12 is shown.
- an air conditioner using a crossflow fan in which at least some slits among a plurality of slits are provided with a rib is shown.
- Fig. 9 is a perspective view of a nose of a crossflow fan according to the fourth embodiment of the invention
- Fig. 10 is a sectional view of the nose on a surface perpendicular to the rotating shaft of the crossflow fan according to the fourth embodiment of the invention.
- a tongue has a plurality of slits 24 arranged in the direction of the rotating shaft 13 of the impeller 12 such that the cross-section of the tongue 18 on a surface (including the rotating shaft 13 of the impeller 12) perpendicular to the circumferential direction of the impeller 12 is formed in a comb shape.
- the plurality of slits 24 are provided with ribs 25 which blocks leakage flow so as to bury portions of the slits 24. Further, some slits 24 among the plurality of slits 24 are formed to have a different shape, and the positions of the ribs 25 differ in the circumferential direction of the impeller 12.
- the remaining slits 24 are formed in the same shape, and the positions of the ribs 25 are identical in the circumferential direction of the impeller 12. With the above exception, the construction and functions of the air conditioner are the same as those of the air conditioner shown in the first embodiment.
- all of the slits 24 do not necessarily need to be formed to have a different shape, but at least some slits 24 among the plurality of slits 24 may be formed in a different shape and the positions of the ribs 25 may differ in the circumferential direction of the impeller 12. Further, all of the slits 24 may be formed to have a different shape, and the positions of the ribs 25 in the circumferential direction of the impeller 12 may differ from each other in all of the slits 24. In all of the slits 24, the depths H in the radius direction of the impeller 12, the lengths L in the circumferential direction thereof, the widths D in the direction of the rotating shaft 13, and the distances T between the adjacent slits 24 are respectively identical.
- the tongue 18 is provided with the plurality of slits 24 such that the cross-section of the tongue 18 on a surface perpendicular to the circumferential direction of the impeller 12 is formed in a comb shape.
- the plurality of slits 24 have the ribs 25, and the positions of the ribs 25 of at least some slits 24 differ in the circumferential direction of the impeller 12. Therefore, a pressure loss in each of the slits 24 can be changed, and a flow rate and direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B can be different for each position of the slits 24.
- an interference position between leakage flow and the impeller blade 15 differs in each of the slits 24, an area coerelated with pressure fluctuation (an area of a region having synchronism) can be reduced; and noise of the crossflow fan can be reduced while efficiency is maintained.
- water generated at the time the air conditioner is on can be held by the rib 25 as well as by surface tension of the slit 24, which makes it possible to strengthen a water-retaining force. Therefore, the accumulation of dew drops is minimized.
- Fig. 11 is a perspective view of the nose of the crossflow fan according to the fourth embodiment of the invention.
- the positions of the ribs 25 in the circumferential direction of the impeller 12 are irregularly changed in the direction of the rotating shaft 13, as shown in Fig. 9.
- the positions of the ribs 25 in the circumferential direction of the impeller 12 are regularly changed in the direction of the rotating shaft 13 as shown in Fig. 11, it is possible to produce the same effect when the positions are irregularly changed.
- Fig. 12 is a cross-sectional view of the nose on a surface perpendicular to the rotating shaft of the crossflow fan according to the fourth embodiment of the invention.
- Fig. 13 is a sectional view of the nose of the crossflow fan according to the fourth embodiment of the invention.
- Fig. 13A is a sectional view of the nose on a surface perpendicular to the rotating shaft of the crossflow fan according to the fourth embodiment of the invention
- Fig. 13B is a sectional view of the nose of the crossflow fan on a surface (a surface including the rotating shaft, that is, a cross-section taken along line F-F of Fig. 13A) perpendicular to the circumferential direction of the impeller of the crossflow fan according to the fourth embodiment of the invention.
- the ribs 25 do not need to be installed in all of the slits 24, but may be installed in only some of the slits 24. Further, when the ribs 25 are installed only in some slits 24, the respective positions, angles, and heights of the ribs 25 in the circumferential direction of the impeller 12 may be identical in the slits 24. Since only some slits 24 have the rib 25, a pressure loss can be changed by the presence or absence of the rib 25, and a flow rate and direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B can be different for each position of the slits 24.
- an interference position between leakage flow and the impeller blade 15 differs for each of the slits 24, an area correlated with pressure fluctuation (an area of a region having synchronism) can be reduced, and noise of the crossflow fan can be reduced while efficiency is maintained.
- a leakage flow rate differs in each position of the slits 24, a suction flow and a leakage flow meet each other, and the strength and position of shear disturbance of flow flowing in the impeller 12 differs in the circumferential direction of the impeller 12. Therefore, an area correlated with pressure fluctuation (an area of a region having synchronism) is reduced, which makes it possible to reduce noise. Therefore, in the crossflow fan shown in the fourth embodiment, at least some slits 24 may have the rib 25.
- the depths H in the radius direction of the impeller 12, the lengths L in the circumferential direction, the widths D in the direction of the rotating shaft 13, and the distances T between the adjacent slits 24 are set to be respectively identical in all of the slits 24.
- the depths H in the radius direction of the impeller 12, the lengths L in the circumferential direction, the widths D in the direction of the rotating shaft 13, and the distances T between the adjacent slits 24 may differ respectively.
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Abstract
Description
- The present invention relates to a crossflow fan used in an air conditioner or the like.
- In a crossflow fan that is used in an air conditioner, an air curtain or the like, a distance between a fan rotor (impeller) and a tongue is preferably shortened to improve efficiency thereof, the tongue provided at a predetermined height along the outer diameter of the fan rotor. In this case, however, when a blade of the fan rotor moves from a tongue region to an air suction region, the flow of air around the blade rapidly varies, thereby increasing noise in a termination region of the tongue region.
- Therefore, in the conventional crossflow fan, in order to prevent the flow around the blade from rapidly varying when the blade of the fan rotor moves from the tongue region to the air suction region, a comb-shaped groove portion is provided at the upper end of the tongue. As the comb-shaped groove portion approaches the air suction region from the tongue region, the width thereof is enlarged, and the depth thereof is changed between the right and left rotors of the fan rotor (for example, refer to
Japanese Patent No. 3248466 pages 2 and 3, and Fig. 3)). - In such a crossflow fan, however, since the length of the tongue in a direction along the outer diameter of the fan rotor (impeller) is shortened, a leakage flow rate flowing from a discharge side to a suction side becomes large. Therefore, a pressure difference between the suction side and the discharge side becomes small, and an unstable circular vortex occurs in the crossflow fan. Accordingly, when a flow rate is low or dust is accumulated in a filter, a flow reverse to an original outlet flow is likely to occur. Consequently, efficiency is degraded, and noise increases.
- According to an aspect of the invention, there is provided a crossflow fan in which the efficiency is high while reducing noise.
- According to another aspect of the present invention, there is provided a crossflow fan includes: an impeller; and a tongue provided along a portion of the outer circumference of the impeller. The tongue is provided with a plurality of slits such that a cross-section of the tongue on a surface perpendicular to a circumferential direction of the impeller is formed in a comb shape. At least one slit of the plurality of slits is formed in a different shape.
- According to the above-aspects, it is possible to provide a crossflow fan in which the efficiency is high while reducing noise.
-
- Fig. 1 is a sectional view of an air conditioner using a crossflow fan according to a first embodiment of the present invention.
- Figs. 2A, 2B are sectional views of a nose of the crossflow fan according to the first embodiment.
- Fig. 3 is a perspective view of the nose of the crossflow fan according to the first embodiment.
- Figs. 4A, 4B are sectional views of the nose of the crossflow fan according to the first embodiment.
- Fig. 5 is a sectional view of a nose of a crossflow fan according to a second embodiment of the invention.
- Fig. 6 is a perspective view of the nose of the crossflow fan according to the second embodiment.
- Fig. 7 is a perspective view of the nose of the crossflow fan according to the second embodiment.
- Fig. 8 is a perspective view of a nose of a crossflow fan according to a third embodiment of the invention.
- Fig. 9 is a perspective view of a nose of a crossflow fan according to a fourth embodiment of the invention.
- Fig. 10 is a sectional view of the nose of the crossflow fan according to the fourth embodiment.
- Fig. 11 is a perspective view of the nose of the crossflow fan according to the fourth embodiment.
- Figs. 12A, 12B are sectional views of the nose of the crossflow fan according to the fourth embodiment.
- Figs. 13A, 13B are sectional views of the nose of the crossflow fan according to the fourth embodiment of the invention.
- Fig. 1 is a sectional view illustrating an air conditioner using a crossflow fan according to a first embodiment of the present invention. In the accompanying drawings, the same reference numeral represents the same component or a component corresponding thereto, which is common in the overall specification. The shapes of components represented in the overall specification are only examples, and are not limited thereto.
- In Fig. 1, a front-side suction grille 2 is provided on the front surface of a
housing 1 of the air conditioner, and an upper-side suction grille 3 is provided on the upper surface thereof. Inside thehousing 1, a filter 4 for removing dust contained in the air is provided along the front-side suction grille 2 and the upper-side suction grille 3. Aheat exchanger 5, which excharges heat with the air sucked from the front-side suction grille 2 and the upper-side suction grille 3, is disposed along the filter 4. At a lower portion of the front surface of thehousing 1, anose 6 is installed so as to be connected to the front-side suction grille 2. On the inner rear surface of thehousing 1, aguider 7 is installed, which introduces the flow of air within the air conditioner. - Between the
heat exchanger 5 and theguider 7, animpeller 12 is disposed which rotates around a rotatingshaft 13 of the crossflow fan. Theimpeller 12 is composed of therotating shaft 13, a plurality of disc-shaped side plates 14 fixed to both ends and the middle of the rotatingshaft 13, andimpeller blades 15 radially fixed to the outer circumferences of theside plates 14. The crossflow fan is provided with theimpeller 12, theguider 7, and thenose 6. - In the lower portion of the
housing 1, an air outlet 8 is provided between thenose 6 and.theguider 7, through which air is blown outside the air conditioner. In the vicinity of the air outlet 8, a left-to-right winddirection changing plate 9 connected to thenose 6 is provided which changes the flow of air in a direction of the rotatingshaft 13, and similarly, in the vicinity of the outlet 8, an up-and-down winddirection changing plate 10 is provided which changes the flow of air in the up and down direction. Further, inside the rear surface of thehousing 1, that is, at the back surface side of theguider 7,piping 11 is disposed in which a refrigerant of theheat exchanger 5 flows. - As the
impeller 12 rotates in a direction of an arrow C of Fig. 1, air is sucked from suction sides of the front-side suction grille 2 and the upper-side suction grille 3. The sucked air is heat-exchanged by theheat exchanger 5 through the filter 4, and then flows through theimpeller blade 15 or theimpeller 12. After the air flows through theimpeller blade 15 of theimpeller 12, the wind direction thereof is properly adjusted by the left-and-right winddirection changing plate 9 and the up-and-down winddirection changing plate 10. Then, the air is blown out of the air outlet 8. - Fig. 2 is a sectional view illustrating the nose of the crossflow fan according to the first embodiment of the invention, and Fig. 3 is a perspective view of the nose of the crossflow fan according to the first embodiment of the invention. Specifically, Fig. 2A is a sectional view of the nose on a surface perpendicular to the rotating shaft of the crossflow fan according to the first embodiment of the invention, and Fig. 2B is a sectional view of the nose on a surface (a surface including the rotating
shaft 13 of theimpeller 12, that is, a cross-sectional surface taken along line E-E of Fig. 2A) perpendicular to a circumferential direction of the impeller of the crossflow fan according to the first embodiment of the invention. - As shown in Figs. 2 and 3, the
nose 6 is provided with an airpassage constituting portion 17 and atongue 18. The airpassage constituting portion 17 constitutes a portion of an air passage inside the air conditioner and serves as a drain which receives water droplets dripping from theheat exchanger 5 so as to be discharged. Thetongue 18, provided along a portion of the outer circumference of theimpeller 12, maintains a pressure difference between a suction side B and a discharge side A which is generated by the rotation of theimpeller 12, so that the crossflow fan obtains high efficiency. In thetongue 18, a plurality ofconcave slits 21 are arranged in the direction of therotating shaft 13 of theimpeller 12 such that thetongue 18 is formed in a comb shape. In the comb shape, the cross-section of thetongue 18 on a surface (a surface including therotating shaft 13 of theimpeller 12, that is, a cross-sectional surface taken along line E-E of Fig. 2A) perpendicular to a circumferential direction of theimpeller 12 has a plurality of convex portions which are connected to a base and on the same side of the corresponding base. Someslits 21 among the plurality ofslits 21 are formed in a different shape, and have a different depth H in a radius direction of theimpeller 12 at the discharge side A. The remaining slits 21 are formed to have the same shape and same depth H in a radius direction of theimpeller 12 in the discharge side A. The depths H of someslits 21 may be changed irregularly or regularly in the discharge side A. - In the crossflow fan shown in the first embodiment, all the
slits 21 do not necessarily need to be formed to have a different shape. However, at least someslits 21 among the plurality ofslits 21 may be formed to have a different shape and may have a different depth H in the radius direction of theimpeller 12 at the discharge side A. Further, all theslits 21 may be formed in a different shape and the depths H thereof in the radius direction of theimpeller 12 in the discharge side A may differ from each other. In all theslits 21, respective lengths L in a circumferential direction of theimpeller 12, widths D in the direction of therotating shaft 13, and distances T between theadjacent slits 21 are identical. - In the crossflow fan shown in the first embodiment, the
tongue 18 is provided with the plurality ofslits 21 such that the cross-section of thetongue 18 on a surface perpendicular to the circumferential direction of theimpeller 12 is formed in a comb shape. Further, at least someslits 21 among the plurality ofslits 21 have a different depth H in the radius direction of theimpeller 12. Therefore, it is possible to change a pressure loss in each of theslits 21 and to change the flow rate and the direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B for each position of theslits 21. Therefore, since an interference position between leakage flow and theimpeller blade 15 differs in each of theslits 21, an area correlated with pressure fluccuation (an area of a region having synchronism) can be reduced, and noise of the crossflow fan can be reduced while efficiency is maintained. - Since a leakage flow rate differs for each position of the
slits 21, a suction flow and a leakage flow meet each other, and the strength and position of shear disturbance of flow flowing in theimpeller 12 differs in the circumferential direction of theimpeller 12. Therefore, an area correlated with pressure fluctuation (an area of a region having synchronism) is reduced, which makes it possible to reduce noise. - In the crossflow fan, a flow rate is reduced in the vicinities of the
side plates 14 provided at both ends in a direction of therotating shaft 13 of theimpeller 12 and in the middle thereof. When a leakage flow rate is large in the low flow rate region, a reverse flow easily occurs, thereby decreasing efficiency. Therefore, theslits 21, in which the depths H at the discharge side A are small, are provided in the low flow rate region flowing through theimpeller 12, and theslits 21, in which the depths H at the discharge side A are large, are provided in a high flow rate region. Then, it is possible to provide a crossflow fan without reducing efficiency caused by a reverse flow and without increasing noise in any position in the direction of therotating shaft 13 of theimpeller 12. That is, the depths H of theslits 21 at the discharge side A may be decreased in the vicinities of theside plates 14 provided at both ends and the middle of therotating shaft 13 of theimpeller 12, and the depths H of theslits 21 at the discharge side A may be increased in other regions. - Fig. 4 is a sectional view of the nose on a surface perpendicular to the circumferential direction of the impeller of the crossflow fan according to the first embodiment of the invention.
- In Fig. 2B, the
slits 21 have been illustrated, of which the cross sections on a surface perpendicular to the circumferential direction of theimpeller 12 are formed in a rectangular shape. However, the cross-sections of theslits 21 may be formed in any shape. That is, the cross-sectional surfaces of theslits 21 may be formed in a triangle shape shown in Fig. 4A or in a trapezoidal shape shown in Fig. 4B. Further, plural types of cross-sectional shapes may be combined. Similarly, the cross-section on a surface perpendicular to the radius direction of the impeller may be formed in any shape. That is, the cross-section may be formed in a rectangular shape, a triangle shape, or a trapezoidal shape. Further, plural types of cross-sectional shapes may be combined. When plural types of cross-sectional shapes are combined, a pressure loss of each slit 21 may be changed. - In the crossflow fan shown in the first embodiment, the lengths L in the circumferential direction of the
impeller 12, the widths D in the direction of therotating shaft 13, and the distances T between theadjacent slits 21 are set to be respectively identical in all of theslits 21. However, the lengths L in a circumferential direction of theimpeller 12, the widths D in the direction of therotating shaft 13, and the.distances T between theadjacent slits 21 may differ from each other. - In the first embodiment, the air conditioner using the crossflow fan in which at least some slits among the plurality of slits have a different depth H in the radius direction of the
impeller 12 is shown. In a second embodiment of the invention, an air conditioner using a crossflow fan in which at least some slits among a plurality of slits have a different length L in a circumferential direction of theimpeller 12 is shown. - Fig. 5 is a sectional view of a nose on a surface perpendicular to a rotating shaft of the crossflow fan according to the second embodiment of the invention, and Fig. 6 is a perspective view of the nose of the crossflow fan according to the second embodiment of the invention.
- As Shown in Figs. 5 and 6, a
tongue 18 has a plurality ofslits 22 arranged in a direction of therotating shaft 13 of theimpeller 12 such that the cross-section of thetongue 18 on a surface (including therotating shaft 13 of the impeller 12) perpendicular to the circumferential direction of theimpeller 12 is formed in a comb shape. Someslits 22 among the plurality ofslits 22 are formed in a different shape and have a different length L in the circumferential direction of theimpeller 12. The remaining slits 22 are formed in the same shape and have an identical length L in the circumferential direction of theimpeller 12. With the above exception, the construction and functions of the air conditioner are the same as those of the air conditioner shown in the first embodiment. - In the crossflow fan shown in the second embodiment, all of the
slits 22 can have the same shape, but at least some of theslits 22 among the plurality ofslits 22 may be formed to have a different shape and a different length L in the circumferential direction of theimpeller 12. Further, all theslits 22 may be formed to have a different shape from each other, and the lengths L thereof in the circumferential direction of theimpeller 12 may differ from each other in all theslits 22. Moreover, in all theslits 22, respective depths H in the radius direction of theimpeller 12, widths D in the direction of therotating shaft 13, and distances T between theadjacent slits 22 are identical. - In the crossflow fan shown in the second embodiment, the
tongue 18 is provided with the plurality ofslits 22 such that the cross-section thereof on a surface perpendicular to the circumferential direction of theimpeller 12 is formed in a comb shape, and at least someslits 22 among the plurality ofslits 22 have a different length L in the circumferential direction of theimpeller 12. Therefore, by changing the length, a pressure loss in each of theslits 22 can be changed, and a flow rate and direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B can be different for each position of theslits 22. Therefore, since an interference position between leakage flow and theimpeller blade 15 differs in each of theslits 22, an area correlated with pressure fluctuation (an area of a region having synchronism) can be reduced, and noise of the crossflow fan can be reduced while efficiency is maintained. - Since a leakage flow rate differs for each position of the
slits 22, a suction flow and a leakage flow meet each other, and the strength and position of shear disturbance of flow flowing in theimpeller 12 differs in the circumferential direction of theimpeller 12. Therefore, an area correlated with pressure fluctuation (an area of a region having synchronism) is reduced, which makes it possible to reduce noise. - Fig. 7 is a perspective view of the nose of the crossflow fan according to the second embodiment.
- In the crossflow fan shown in Fig. 6, the lengths L of the
slits 22 in the circumferential direction of theimpeller 12 are irregularly changed in the direction of therotating shaft 13. However, although the lengths L of theslits 22 in the circumferential direction of theimpeller 12 are regularly changed as shown in Fig. 7, it is possible to obtain the same effect as the lengths L are irregularly changed. - Further, the
slits 22, in which the lengths L in the circumferential direction of theimpeller 12 are small, are provided in a low flow rate region flowing through theimpeller 12, and theslits 22, in which the lengths L in the circumferential direction of theimpeller 12 are large, are provided in a high flow rate region, which makes it possible to provide a crossflow fan in without reducing the efficiency caused by a reverse flow and without increasing noise in any position in a direction of therotating shaft 13 of theimpeller 12. That is, the lengths L of theslits 22 may be reduced in the vicinities of theside plates 14 provided at both ends and the middle of therotating shaft 13 of theimpeller 12, and the lengths L of theslits 22 may be increased in other regions. - In the crossflow fan shown in the second embodiment, the depths H in the radius direction of the
impeller 12, the widths D in the direction of therotating shaft 13, and the distances T between theadjacent slits 22 are set to be respectively identical in all of theslits 22. However, the depths H in the radius direction of theimpeller 12, the widths D in the direction of therotating shaft 13, and the distances T between theadjacent slits 22 may respectively differ. - In the first embodiment, the air conditioner using the crossflow fan in which at least some slits among the plurality of slits have a different depth H in the radius direction of the
impeller 12 is shown. In a third embodiment of the invention, an air conditioner using a crossflow fan in which at least some slits among a plurality of slits have a different width D in a direction of therotating shaft 13 of theimpeller 12 is shown. - Fig. 8 is a perspective view illustrating a nose of the crossflow fan according to the third embodiment of the invention.
- As shown in Fig. 8, a
tongue 18 has a plurality ofslits 23 arranged in a direction of therotating shaft 13 of theimpeller 12 such that the cross-section of thetongue 18 on a surface (including therotating shaft 13 of the impeller 12) perpendicular to the circumferential direction of theimpeller 12 is formed in a comb shape. Someslits 23 among the plurality ofslits 23 are formed to have a different shape and a different width D in the direction of therotating shaft 13 of theimpeller 12. The remaining slits 23 are formed to have the same shape and an identical width D in the direction of therotating shaft 13 of theimpeller 12. With the above exception, the construction and functions of the air conditioner are the same as those of the air conditioner shown in the first embodiment. - In the crossflow fan shown in the third embodiment, all of the
slits 23 can be formed in the same shape, but at least someslits 23 among the plurality ofslits 23 may be formed to have a different shape and may have a different width D in the direction of therotating shaft 13 of theimpeller 12. Further, all theslits 23 may be formed to have a different shape from each other, and the widths D in the direction of therotating shaft 13 of theimpeller 12 may differ from each other in all of theslits 23. In all of theslits 23, the depths H in the radius direction of theimpeller 12, the lengths L in the circumferential direction thereof, and the distances T between theadjacent slits 23 are respectively identical. - In the crossflow fan shown in the third embodiment, the
tongue 18 is provided with the plurality ofslits 23 such that the cross-section of thetongue 18 on a surface perpendicular to the circumferential direction of theimpeller 12 is formed in a comb shape, and at least someslits 23 among the plurality ofslits 23 have a different width D in the direction of therotating shaft 13 of theimpeller 12. Therefore, a pressure loss in each of theslits 23 can be changed, and a flow rate and direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B can he different for each position of theslits 23. Therefore, since an interference position between the leakage flow and theimpeller blade 15 differs in each of theslits 23, an area correlated with pressure fluctuation (an area of a region having synchronism) can be reduced, and noise of the crossflow fan can be reduced while efficiency is maintained. - Since a leakage flow rate differs in each position of the
slits 23, a suction flow and a leakage flow meet each other, and the strength and position of shear disturbance of flow flowing in theimpeller 12 differs in the circumferential direction of theimpeller 12. Therefore, an area correlated with pressure fluctuation (an area of a region having synchronism) is reduced, which makes it possible to reduce noise. - In the crossflow fan shown in the third embodiment, the thickness of a material composing the
tongue 18 is uniform, as compared with the crossflow fans shown in the first and second embodiments. Therefore, it is possible to easily mold the crossflow fan. - In the third embodiment, the widths D of the
slits 23 in the direction of therotating shaft 13 are irregularly changed as shown in Fig. 8. However, although the widths D of theslits 23 in the direction of therotating shaft 13 are regularly changed in the direction of therotating shaft 13, it is possible to obtain the same effect as the widths that are irregularly changed. - The
slits 23, in which the widths D in the direction of therotating shaft 13 are small, are provided in a low flow rate region flowing through theimpeller 12, and theslits 23, in which the widths D in the direction of therotating shaft 13 are large, are provided in a high flow rate region. Therefore, it is possible to provide a crossflow fan without reducing efficiency caused by a reverse flow and without increasing noise in any position in the direction of therotating shaft 13 of theimpeller 12. That is, the depths D of theslits 23 may be decreased in the vicinities of theside plates 14 provided at both ends and the middle of therotating shaft 13 of theimpeller 12, and the widths D of theslits 23 may be increased in other regions. - In the crossflow fan shown in the third embodiment, the depths H in the radius direction of the
impeller 12, the lengths L in the circumferential direction, and the distances T between theadjacent slits 23 are set to be respectively identical in all of theslits 23. However, the depths H in the radius direction of theimpeller 12, the lengths L in the circumferential direction, and the distances T between theadjacent slits 23 may respectively differ. - In the first embodiment, the air conditioner using the crossflow fan in which at least some slits among the plurality of slits have a different depth H in a radius direction of the
impeller 12 is shown. In a fourth embodiment of the invention, an air conditioner using a crossflow fan in which at least some slits among a plurality of slits are provided with a rib is shown. - Fig. 9 is a perspective view of a nose of a crossflow fan according to the fourth embodiment of the invention, and Fig. 10 is a sectional view of the nose on a surface perpendicular to the rotating shaft of the crossflow fan according to the fourth embodiment of the invention.
- As shown in Figs. 9 and 10, a tongue has a plurality of
slits 24 arranged in the direction of therotating shaft 13 of theimpeller 12 such that the cross-section of thetongue 18 on a surface (including therotating shaft 13 of the impeller 12) perpendicular to the circumferential direction of theimpeller 12 is formed in a comb shape. The plurality ofslits 24 are provided withribs 25 which blocks leakage flow so as to bury portions of theslits 24. Further, someslits 24 among the plurality ofslits 24 are formed to have a different shape, and the positions of theribs 25 differ in the circumferential direction of theimpeller 12. The remaining slits 24 are formed in the same shape, and the positions of theribs 25 are identical in the circumferential direction of theimpeller 12. With the above exception, the construction and functions of the air conditioner are the same as those of the air conditioner shown in the first embodiment. - In the crossflow fan shown in the fourth embodiment, all of the
slits 24 do not necessarily need to be formed to have a different shape, but at least someslits 24 among the plurality ofslits 24 may be formed in a different shape and the positions of theribs 25 may differ in the circumferential direction of theimpeller 12. Further, all of theslits 24 may be formed to have a different shape, and the positions of theribs 25 in the circumferential direction of theimpeller 12 may differ from each other in all of theslits 24. In all of theslits 24, the depths H in the radius direction of theimpeller 12, the lengths L in the circumferential direction thereof, the widths D in the direction of therotating shaft 13, and the distances T between theadjacent slits 24 are respectively identical. - In the crossflow fan shown in the fourth embodiment, the
tongue 18 is provided with the plurality ofslits 24 such that the cross-section of thetongue 18 on a surface perpendicular to the circumferential direction of theimpeller 12 is formed in a comb shape. Further, the plurality ofslits 24 have theribs 25, and the positions of theribs 25 of at least someslits 24 differ in the circumferential direction of theimpeller 12. Therefore, a pressure loss in each of theslits 24 can be changed, and a flow rate and direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B can be different for each position of theslits 24. Therefore, since an interference position between leakage flow and theimpeller blade 15 differs in each of theslits 24, an area coerelated with pressure fluctuation (an area of a region having synchronism) can be reduced; and noise of the crossflow fan can be reduced while efficiency is maintained. - Since a leakage flow rate differs in each position of the
slits 24, a suction flow and a leakage flow meet each other, and the strength and position of shear disturbance of flow flowing in theimpeller 12 differs in the circumferential direction of theimpeller 12. Therefore, an area correlated with pressure fluctuation (an area of a region having synchronism) is reduced, which makes it possible to reduce noise. - In the air conditioner shown in the fourth embodiment, water generated at the time the air conditioner is on can be held by the
rib 25 as well as by surface tension of theslit 24, which makes it possible to strengthen a water-retaining force. Therefore, the accumulation of dew drops is minimized. - Fig. 11 is a perspective view of the nose of the crossflow fan according to the fourth embodiment of the invention.
- In the fourth embodiment, the positions of the
ribs 25 in the circumferential direction of theimpeller 12 are irregularly changed in the direction of therotating shaft 13, as shown in Fig. 9. However, although the positions of theribs 25 in the circumferential direction of theimpeller 12 are regularly changed in the direction of therotating shaft 13 as shown in Fig. 11, it is possible to produce the same effect when the positions are irregularly changed. - Fig. 12 is a cross-sectional view of the nose on a surface perpendicular to the rotating shaft of the crossflow fan according to the fourth embodiment of the invention.
- In the crossflow fans shown in Figs. 9 and 10, the positions of the
ribs 25 in the plurality ofslits 24 are changed, and a flow rate and direction of leakage flow are changed. However, even though all of theribs 25 of theslits 24 are provided in the same position, angles of theribs 25 are changed, and a flow rate and direction of leakage flow are changed as shown in Figs. 12A and 12B, it is possible to produce the same effect as those of the crossflow fans shown in Figs. 9 and 10. - Fig. 13 is a sectional view of the nose of the crossflow fan according to the fourth embodiment of the invention. Specifically, Fig. 13A is a sectional view of the nose on a surface perpendicular to the rotating shaft of the crossflow fan according to the fourth embodiment of the invention, and Fig. 13B is a sectional view of the nose of the crossflow fan on a surface (a surface including the rotating shaft, that is, a cross-section taken along line F-F of Fig. 13A) perpendicular to the circumferential direction of the impeller of the crossflow fan according to the fourth embodiment of the invention.
- In Fig. 13, all of the
ribs 25 of theslits 24 are positioned in the same position, similar to the ribs shown in Fig. 12. Further, the heights Hr of theribs 25 are changed, and a flow rate and direction of leakage flow are changed. Although theribs 25 of theslits 24 are positioned in the same position and the heights Hr of the ribs are changed, it is possible to produce the same effect as those of the crossflow fans shown in Figs. 9 and 10. - The
ribs 25 do not need to be installed in all of theslits 24, but may be installed in only some of theslits 24. Further, when theribs 25 are installed only in someslits 24, the respective positions, angles, and heights of theribs 25 in the circumferential direction of theimpeller 12 may be identical in theslits 24. Since only someslits 24 have therib 25, a pressure loss can be changed by the presence or absence of therib 25, and a flow rate and direction of leakage flow from the discharge side (high-pressure side) A to the suction side (low-pressure side) B can be different for each position of theslits 24. Therefore, since an interference position between leakage flow and theimpeller blade 15 differs for each of theslits 24, an area correlated with pressure fluctuation (an area of a region having synchronism) can be reduced, and noise of the crossflow fan can be reduced while efficiency is maintained. Further, since a leakage flow rate differs in each position of theslits 24, a suction flow and a leakage flow meet each other, and the strength and position of shear disturbance of flow flowing in theimpeller 12 differs in the circumferential direction of theimpeller 12. Therefore, an area correlated with pressure fluctuation (an area of a region having synchronism) is reduced, which makes it possible to reduce noise. Therefore, in the crossflow fan shown in the fourth embodiment, at least someslits 24 may have therib 25. - In the cross flow fan shown in the fourth embodiment, the depths H in the radius direction of the
impeller 12, the lengths L in the circumferential direction, the widths D in the direction of therotating shaft 13, and the distances T between theadjacent slits 24 are set to be respectively identical in all of theslits 24. However, the depths H in the radius direction of theimpeller 12, the lengths L in the circumferential direction, the widths D in the direction of therotating shaft 13, and the distances T between theadjacent slits 24 may differ respectively.
Claims (8)
- A crossflow fan comprising:an impeller; anda tongue provided along a portion of the outer circumference of the impeller, wherein the tongue is provided with a plurality of slits such that a cross-section of the tongue on a surface perpendicular to a circumferential direction of the impeller is formed in a comb shape, andwherein at least one slit of the plurality of slits is formed in a different shape.
- The crossflow fan according to claim 1,
wherein the at least one slit has a different depth in a radius direction of the impeller. - The crossflow fan according to claim 1,
wherein the at least one slit has a different length in the circumferential direction of the impeller. - The crossflow fan according to claim 1,
wherein the at least one slit has a different width in a direction of rotating shaft of the impeller. - The crossflow fan according to claim 1,
wherein the at least one slit has a rib in which the at least one slit is at least partly buried. - The crossflow fan according to claim 5,
wherein, in the at least one slit, position of the rib is different in the circumferential direction of the impeller. - The crossflow fan according to claim 5,
wherein, in the at least one slit, the rib has a different height. - The crossflow fan according to claim 5,
wherein, in the at least one slit, the angle of the rib is different.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2005314751A JP2007120880A (en) | 2005-10-28 | 2005-10-28 | Cross flow fan |
Publications (3)
Publication Number | Publication Date |
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EP1780475A2 true EP1780475A2 (en) | 2007-05-02 |
EP1780475A3 EP1780475A3 (en) | 2013-01-16 |
EP1780475B1 EP1780475B1 (en) | 2016-10-19 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP06022505.9A Active EP1780475B1 (en) | 2005-10-28 | 2006-10-27 | Crossflow fan |
Country Status (4)
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EP (1) | EP1780475B1 (en) |
JP (1) | JP2007120880A (en) |
CN (1) | CN100462564C (en) |
ES (1) | ES2604201T3 (en) |
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CN102454635A (en) * | 2010-10-26 | 2012-05-16 | 珠海格力电器股份有限公司 | Cross-flow fan |
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2005
- 2005-10-28 JP JP2005314751A patent/JP2007120880A/en active Pending
-
2006
- 2006-10-27 CN CNB2006101428375A patent/CN100462564C/en active Active
- 2006-10-27 EP EP06022505.9A patent/EP1780475B1/en active Active
- 2006-10-27 ES ES06022505.9T patent/ES2604201T3/en active Active
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JPH01167494A (en) * | 1987-12-23 | 1989-07-03 | Hitachi Ltd | Crossflow fan |
JPH0480533A (en) * | 1990-07-24 | 1992-03-13 | Daikin Ind Ltd | Indoor device of air conditioner |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150300681A1 (en) * | 2012-12-13 | 2015-10-22 | Mitsubishi Electric Corporation | Indoor unit of air-conditioning apparatus |
WO2014158811A1 (en) | 2013-03-14 | 2014-10-02 | Icahn School Of Medicine At Mount Sinai | Newcastle disease viruses and uses thereof |
US20180112888A1 (en) * | 2016-10-21 | 2018-04-26 | Samsung Electronics Co., Ltd | Air conditioner |
EP3315785A1 (en) * | 2016-10-21 | 2018-05-02 | Samsung Electronics Co., Ltd. | Air conditioner |
CN113906218A (en) * | 2019-07-03 | 2022-01-07 | 极光先进雷射株式会社 | Laser cavity and electronic device manufacturing method |
US11947263B2 (en) | 2019-07-03 | 2024-04-02 | Gigaphoton Inc. | Laser chamber and electronic device manufacturing method |
US20240117810A1 (en) * | 2021-03-31 | 2024-04-11 | Fujitsu General Limited | Blower and indoor unit |
Also Published As
Publication number | Publication date |
---|---|
EP1780475A3 (en) | 2013-01-16 |
CN1955485A (en) | 2007-05-02 |
JP2007120880A (en) | 2007-05-17 |
EP1780475B1 (en) | 2016-10-19 |
CN100462564C (en) | 2009-02-18 |
ES2604201T3 (en) | 2017-03-03 |
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