EP2264320B1 - Turboventilateur et climatiseur - Google Patents

Turboventilateur et climatiseur Download PDF

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Publication number
EP2264320B1
EP2264320B1 EP09731652.5A EP09731652A EP2264320B1 EP 2264320 B1 EP2264320 B1 EP 2264320B1 EP 09731652 A EP09731652 A EP 09731652A EP 2264320 B1 EP2264320 B1 EP 2264320B1
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EP
European Patent Office
Prior art keywords
blade
side plate
turbofan
main plate
circumferential surface
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.)
Active
Application number
EP09731652.5A
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German (de)
English (en)
Other versions
EP2264320A1 (fr
EP2264320A4 (fr
Inventor
Takashi Ikeda
Shingo Hamada
Atsushi Edayoshi
Kazutaka Suzuki
Kazuya Kubo
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Publication date
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Publication of EP2264320A1 publication Critical patent/EP2264320A1/fr
Publication of EP2264320A4 publication Critical patent/EP2264320A4/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • 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
    • F24F1/0035—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room
    • F24F1/0038—Indoor units, e.g. fan coil units characterised by introduction of outside air to the room in combination with simultaneous exhaustion of inside air
    • 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
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F24F2013/0616—Outlets that have intake openings

Definitions

  • the present invention relates to a turbofan and an air conditioning apparatus, and more particularly, to a turbofan for use in an air conditioning apparatus for air cleaning, humidifying, dehumidifying, cooling, or heating purposes and to an air conditioning apparatus provided with the same.
  • the turbofans according to these arrangements cause the side plate side end of the blade leading edge having a particularly greater velocity component in the axial direction of inlet air to be slanted in the rotational direction so as to follow the air inlet direction, thereby securely preventing a separation forming readily in the opposite blade rotational direction and consequently providing improved performance and reduced noise levels.
  • a greater leading edge side inclination angle ⁇ at the center allows air to be very smoothly taken in from the inner circumferential side.
  • an inclination angle ⁇ on the side plate side is smaller than that on the main plate side, air can be smoothly taken in since the blade is shaped to follow the inlet angle.
  • a greater inclination angle (outlet angle ⁇ ) on the center side than on the main and side plate sides allows homogenization of air blown on the outer circumferential side.
  • JP 2008-2379 discloses a centrifugal fan including a circular main plate and a circular side plate and a plurality of hollow blades provided in parallel between the main plate and the side plate at predetermined blade intervals in the circumferential direction.
  • An auxiliary air intake port for taking in air into a hollow part is provided on the side plate side of the blade, while an auxiliary air intake port is provided on the outer peripheral part negative pressure face side of the blade.
  • An object of the present invention is to provide a turbofan and an air conditioning apparatus provided with the same, which provides low-noise emission, ease to assemble, and good workability by suppressing a separation region at a blade leading edge, a side plate side end, and a trailing edge, while minimizing performance degradation even if air flow resistance is added.
  • Fig. 1 is a longitudinal sectional view showing an air conditioning apparatus according to Embodiment 1 of the present invention.
  • An air conditioning apparatus according to Embodiment 1 of the present invention is equipped with a turbofan according to Embodiment 2 to be described later, and is described below with reference to accompanying drawings.
  • a ceiling-embedded type air conditioning apparatus body (hereinafter referred to as "air conditioning apparatus body") 10 is mounted on a ceiling 21 of a room 20 in such a manner that it is embedded in a rectangular-shaped hole formed in the ceiling 21.
  • the air conditioning apparatus body is a box having an opening formed at the bottom thereof and having a top plate 10a and a side plate 10b opposed to the top plate 10a.
  • the side plate 10b has a side plate opening (communicating with a body inlet opening 10c) formed at the center thereof and has a bottom edge substantially flush with the ceiling 21, so an opening of the air conditioning apparatus body is also substantially flush with the ceiling 21.
  • decorative panel 11 shaped substantially in a rectangle in a plan view is installed on the side plate 10b or the ceiling 20 while facing the room 20 so as to cover the lower end of the side plate 10b and the rectangular-shaped hole of the ceiling 21.
  • the decorative panel 11 includes an inlet grill 11a, which is an inlet opening of air for the air conditioning apparatus body 10, provided at the center thereof, a filter 12 for removing dust from the air having passed through the inlet grill 11a, a panel outlet opening 11b formed along each side of the decorative panel 11.
  • Each panel outlet opening 11b is provided with a wind direction vane 13.
  • a turbofan 1 Inside the air conditioning apparatus body 10 a turbofan 1, a bell mouth 14 that forms an inlet air passage for the turbofan, a fan motor 15 for turning and driving the turbofan 1, and a heat exchanger 16 for performing heat exchange of room air drawn into the apparatus body (hereinafter referred to as "drawn air") are disposed respectively.
  • the heat exchanger 16 is formed to have a substantial C-shaped form in the plan view , installed uprightly so as to surround the periphery of the turbofan 1, and connected to an outdoor unit (not illustrated) through connecting piping.
  • the air conditioning apparatus body 10 includes a body inlet opening 10c formed at the center thereof, and a body outlet opening 10d is formed around the body inlet opening 10c.
  • the body inlet opening 10c communicates with the inlet grill 11a of the facing panel 11, while the body outlet opening 10d communicates with the panel outlet opening 11b of the decorative panel 11.
  • the air in the room 20 is drawn into the turbofan 1 after passing through the inlet grill 11a of the decorative panel 11, the filter 12 removing dust, the body inlet opening 10c, and the bell mouth 14. Then, the air blows off into the heat exchanger 16 where the air is subjected to heat exchanging including heating or cooling and dehumidifying, and is blown out from the panel outlet opening 11b toward the room 20 through the body outlet opening 10d while subjected to wind direction control by the wind direction vane 13. Whereby, the air in the room 20 is air-conditioned (hereinafter referred to as "air conditioning").
  • Figs. 2 through 17 are views showing a turbofan according to Embodiment 2 of the present invention.
  • Fig. 2 is a perspective view.
  • Fig. 3 is a plan view, partly in cross section, of a turbofan, as viewed from a fan inlet opening side.
  • Fig. 4 a side view showing a section taken along the line X-X of Fig. 3 .
  • Fig. 5 is a partial side view.
  • Figs. 6 through 9 are partial planar sectional views.
  • Fig. 10 is a partial plan view.
  • Figs. 11 and 12 are partial sectional views.
  • Figs. 13 through 17 are diagrams showing the relationship between a noise level and an angle of each section.
  • Fig. 2 corresponds to a perspective view of Fig. 1 , as seen when looking up at the ceiling 21.
  • Fig. 4 and Fig. 1 are upside-down views, where air is drawn from the upper side in Fig. 4 and blown off toward the right and left directions in Fig. 4 .
  • a top to bottom direction in Fig. 4 is called “height direction”, while a left to right direction and a face-to-back direction is called “horizontal direction” for convenience sake.
  • the same reference numbers and symbols refer to the same components, and descriptions of the components are partially omitted.
  • Fig. 13 is a diagram showing relationship between a blade trailing edge inclination angle ⁇ and a noise level associated with the same air volume.
  • Fig. 14 is a diagram showing relationship between a circumferential curvature angle ⁇ and a noise level associated with the same air volume.
  • Fig. 15 is a diagram showing relationship between an outlet angular difference ⁇ 2 and a noise level associated with the same air volume.
  • Fig. 16 is a diagram showing relationship between a curvature angle ⁇ at a blade leading edge end 4a3 and a noise level associated with the same air volume in relation to the ratio of an air flow resistance without dust accumulation on a filter disposed at an inlet side to that with dust accumulation.
  • Fig. 13 is a diagram showing relationship between a blade trailing edge inclination angle ⁇ and a noise level associated with the same air volume.
  • Fig. 14 is a diagram showing relationship between a circumferential curvature angle ⁇ and a noise level associated with the same air volume.
  • FIG. 17 is a diagram showing relationship between an inlet angular difference ⁇ 1 and a noise level associated with the same air volume, the inlet angular difference being an angular difference between an inlet angle the blade leading edge end and an inlet angle at a blade leading edge inner circumferential side end at a height of a concave-shaped bottom where a vertical camber line C12 becomes most along the opposite rotational direction in a blade outer circumferential surface.
  • the turbofan 1 is integrally formed of a main plate 2 of a body of revolution (disk) having a substantially angular-shaped section, a side plate 3 of a circular ring having a substantially circular arc section disposed so as to be opposed to the periphery of the main plate 2, and a plurality of blades 4 disposed so as to extended from the main plate 2 to the side plate 3.
  • the main plate 2 includes a boss 2a formed at the center (convex portion having a substantially angular shaped section) thereof, the boss 2a being a fixing part to which a rotational shaft 0 of the fan motor 15 is secured. Accordingly, a rotational axis is parallel to the height direction and perpendicular to the horizontal direction.
  • a side plate opening formed at the center thereof forms a fun inlet opening 1a.
  • the peripheral portion (skirt having a substantially angular shaped section) of the main plate 2 and the side plate 3 form wind guide walls, and a space defined by these components forms a fan outlet opening 1b.
  • air flow is formed which rises (indicated by a downward arrow since the upside is down in Figs. 2 through 12 ) and then horizontally moves toward the outer circumference.
  • the blade 4 is located farther away from the rotational axis O as it comes nearer to the blade trailing edge from the blade leading edge 4a.
  • the blade is connected at its end edge of the blade 4 close to the side plate 3 to the side plate in a region (4ec4 ⁇ 4g1) close to the blade trailing edge 4e, and is located at the side plate opening away from the side plate 3 in a region (4g1 ⁇ 4a3) close to the blade leading edge 4a.
  • the blade 4 has a hollow structure having a cavity therein and an opening formed outside of the impeller of the main plate 2 in such a manner that a wall thickness T (equal to the distance between the blade outer circumferential surface and the blade inner circumferential surface) in a horizontal section perpendicular to the rotational axis O of the blade 4 decreases from a position close to the main plate 2 toward a position close to the side plate 3.
  • the blade trailing edge 4e of the blade 4 is located on a hypothetical cylinder defined by connecting the circumferential edges of the main plate 2 and the side plate 3, and has a wavy form having at least two inflection points on such a hypothetical cylinder.
  • an intersection of a horizontal camber line C1 and the blade trailing edge 4e depicts, in relation to an intersection 4ec1 as a main plate side joined point in the height direction, an intersection 4ec2 which is a main plate side inflection point having a curvature toward a rotational direction in a convex form at a predetermined position on the side of the main plate 2 closer to the center of the fan outlet opening 1b, an intersection 4ec3 which is a side plate side inflection point having a curvature toward the reverse rotational direction in a concave form on the side of the side plate 3 closer to the center of the fan outlet opening 1b, and an intersection 4ec4 which is a side plate side joined point of the side plate 3.
  • a line G connecting between the main plate side joined portion 4ec1 and the side plate side joined portion 4ec4 is upright in the vicinity of the main plate 2 and the side plate 3 so as to be parallel to the rotational axis O, while the blade trailing edge on the side of the main plate 2 is inclined to the rotational direction A in relation to that on the side of the side plate 3 between the main plate side inflection point 4ec2 and the side plate side inflection point 4ec3 so that the blade trailing edge 4e has a substantial S shape.
  • the blade trailing edge 4e is located on a hypothetical cylinder defined by connecting the outer circumferential edges of the main plate 2 and the side plate 3, and a line G connecting a main plate side jointed point 4ec1 and a side plate side joined point 4ec4 is orthogonal (orthogonal as a normal line) to the outer circumferential surface of the main plate 2 so as to be parallel to the rotational axis O.
  • the blade trailing edge 4e is parallel to the normal line of the side plate 3 in the vicinity of the side plate 3. Furthermore, between main plate side curvature point 4ec2, which is a location in a main plate side curved portion most projected to the rotational direction A, and the side plate side curvature point 4ec3, which is a location in a side plate side curved portion most projected to the opposite direction of the rotational direction A, the blade trailing edge 4e projects more to the rotational direction A as it is closer to the main plate 2, so as to be inclined in a side view. As a result, the blade trailing edge 4e has a substantial S shape.
  • drawn air is divided by the main plate side curvature point 4ec2 into the sides of the main plate 2 and the central part in the height direction of the outlet opening 1b, thereby preventing air flow from concentrating on the side of the main plate 2.
  • An inclined section 4e5 between the main plate side curvature point 4ec2 and the side plate side curvature point 4ec3 exerts a force in the direction of the side plate 3, guiding the air flow.
  • a portion between the side plate side curvature point 4ec3 and the side plate side joined point 4ec4 guides, on the blade inner circumferential surface 4c thereof, air flow coming from a portion around the side plate side joined portion 4g at the leading edge side plate side end 4a1 of the blade 4 to the side of the side plate 3 in the fan outlet opening 1b.
  • Figs. 6 through 10 are sectional views taken along the line L1-L1, the line L2-L2, the line L3-L3, the line L4-L4, and the line L5-L5 of Fig. 4 , respectively.
  • the rotational direction is indicated by "Arrow A”.
  • Fig. 6 is a sectional-view taken along the line L1-L1 at the main plate side end 4d joined to the main plate 2.
  • Fig. 7 is a cross-sectional view taken along the line L2-L2 located on the side of the main plate 2 from the center of the fan outlet opening 1b.
  • Fig. 8 is a cross-sectional view taken along the line L3-L3 located on the side of the side plate 3 from the center of the fan outlet opening 1b.
  • Fig. 9 is a cross-sectional view taken along the line L4-L4 going through the side plate 3 in the fan outlet opening 1b.
  • Fig. 10 is a cross-sectional view taken along the line L5-L5 when removing the side plate 3 corresponding to one blade 4.
  • a wall thickness center line (equal to the center between the blade inner and outer circumferential surfaces) in the section is indicated by "horizontal camber line C1", and "the intersection of the horizontal camber line C1 and the blade leading edge 4a” and “the intersection of the horizontal camber line C1 and the blade trailing edge 4e” are indicated by “4ac1” and “4ec1”, respectively.
  • a wall thickness center line in the section is indicated by "horizontal camber line C2", and "the intersection of the horizontal camber line C2 and the blade leading edge 4a” and “the intersection of the horizontal camber line C2 and the blade trailing edge 4e” are indicated by “4ac2” and “4ec2”, respectively.
  • the blade 4 is an wing type blade which is gradually thickening toward the center of the blade from the blade inner circumference side leading edge 4a2, and is gradually thinning toward the blade trailing edge 4e.
  • the blade 4 is slanted backward against the rotational direction A and radially outwardly curved.
  • a section L2-L2 shown in Fig. 7 the side of the main plate 2 of the blade trailing edge 4e is curved in a warped backward shape in the rotational direction A.
  • the blade trailing edge 4e is curved in a warped shape in the direction opposite to the rotational direction A against the main plate side joined part 4ec1.
  • the side plate side jointed point 4ec4 and the main plate side joined point 4ec1 in the L1-L1 section shown in Fig. 6 have the same phase in a plan view as seen from the fan inlet opening la, and the leading edge inner circumference side end radially outwardly curves.
  • the main plate side curvature point 4ec2 and the side plate side curvature point 4ec3 are disposed so as to make a predetermined angle ⁇ across the main plate side joined point 4ec1 and the side plate side joined point 4ec4.
  • the blade leading edge 4a on the blade 4 at the air inlet side has a shape defined by the side plate side end 4a1 and the inner circumferential side end 4a2 continuously formed with the leading-edge end 4a3 as a bending point.
  • the side plate side end 4a1 is tilted toward the fan inlet opening 1a as it approaches "side plate joined portion 4g (see Fig. 4 ) where the blade 4 and the side plate 3 are joined" from the leading-edge end 4a3.
  • the side plate side end 4a1 approaches the side plate 3 being inclined so as to approach the normal line of the side plate 4.
  • intersection of the horizontal camber line C1 and the blade leading edge inner circumferential side end 4a2 is called “intersection 4ac1”
  • intersection of the horizontal camber line C1 and the blade trailing edge end 4e is called “intersection 4ec1”
  • a line connecting the intersection 4ac1 and the intersection 4ec1 is called “chord line D”.
  • a longitudinal section perpendicular to the chord line D in the vicinity of the blade leading edge inner circumferential end 4a2 is called “K1-K1 section", and the blade 4 in the K1-K1 section is shown in Fig. 11 .
  • a longitudinal section perpendicular to the chord line D at the end in a rotational direction 4g1 of the side plate joined portion is called “K2-K2 section”, and the blade 4 in the K2-K2 section is shown in Fig. 12 .
  • vertical thickness center lines (equal to the center line between the blade inner circumferential surface and the blade outer circumferential surface) in the K1-K1 section and the K2-K2 section are called “vertical camber lines C12", while angles between the vertical camber line C12 and the rotational axis O at the blade leading edge end 4a3 (K1-K1 section) and at the blade side plate joined portion 4g1 (K2-K2 section) are called “curvature angle ⁇ 1" and curvature angle ⁇ 2", respectively.
  • a region apart from the side plate 3, in an end edge of the blade close to the side plate 3 curves so as to be located more radially outward at a position closer to the blade leading edge 4a in a plan view, and expands so as to be farther away from the end edge at the curved region closer to the blade leading edge 4a in a side view.
  • the blade leading edge side plate side end 4a1 and the leading edge inner circumferential side end 4a2 on the side of the side plate 3 curves radially outward so that the curvature angle ⁇ becomes larger at a position closer to the impeller inner circumference (equal to a position closer to the blade leading edge 4a) with the end in the rotational direction 4g1 on the blade outer circumferential surface of the side plate joined portion 4g being as a supporting point and the blade leading edge end 4a3 being as a power point.
  • the curved region is formed to have a substantial triangle shape in a side view, causing an oblique "folding line B" to be created on the outer circumferential surface 4b of the blade 4 so as to extend toward the blade leading edge inner circumferential side end 4a2 of the blade leading edge from the end in the rotational direction 4g1 to the main plate 2.
  • the blade thickness T is made gradually larger so that the blade outer circumferential surface 4b of the blade leading edge 4a on the side of the main plate 2 curves radially outward, and at the same time the vertical camber line C12 curves radially outward.
  • the blade outer circumferential surface 4b is substantially perpendicular to the outer circumferential surface of the main plate 2. Only the blade inner circumferential surface 4c on the side of the side plate 3 curves radially outward, and the blade 4 stands substantially upright with its thickness becoming smaller toward the side plate 3 from the main plate 2(with increasing height), as a whole.
  • an inlet angle ⁇ 1 gradually becomes larger in a region from the blade leading edge end 4a3 to the side plate 3 to cause the inlet angle ⁇ 14 at the blade leading edge end 4a3 to be the smallest, so that ⁇ 14 is smaller than ⁇ 11, and ⁇ 12 and ⁇ 13 of middle portions in the height direction are greater than at least ⁇ 11 and ⁇ 14, respectively ( ⁇ 12> ⁇ 11, ⁇ 13> ⁇ 14).
  • the blade leading edge 4a is at least so formed that the blade outer circumferential surface 4b on the sides of the blade side plate 4a1 and the main plate 2 is formed to have a convex shape in relation to the rotational direction A, while the blade inner circumferential surface 4c is formed so as to curve radially outward.
  • the turbofan 1 when being rotated by the fan motor 15 in the rotational direction A, substantially radially blows out the room air (drawn air), which has been drawn through the fan inlet opening 1a and passed through the blade 4, through the fan outlet opening 1b, providing the following effects and advantages.
  • the combination of these shapes allows the drawn air to be smoothly drawn in along the entire blade leading edge 4a, causing a rectified air flow to be drawn in toward the blade trailing edge 4e. This facilitates the flow of the drawn air along the substantial S shaped surface of the blade with less turbulence, further homogenizing the wind speed distribution and reducing noise levels by synergistic effect.
  • a turbofan according to the present invention is a low-noise, reliable, and durable turbofan.
  • An air conditioning apparatus provided with such a turbofan ensures a comfortable usage environment free from harsh noise as well as a trouble free use for a long time.
  • a low-cost, high-quality air conditioning apparatus can be provided.
  • Figs. 18 and 19 show a turbofan according to Embodiment 3 of the present invention.
  • Fig. 18 is a perspective view
  • Fig. 19 is a partial cross-sectional view (to be precise, a longitudinal sectional view of the blade 4 in a plane perpendicular to the chord D at the blade main plate side end 4b).
  • the same symbols and reference numerals in Figs. 18 and 19 as those in Embodiment 2 ( Figs. 2 through 12 ) refer to the same components, and repeated descriptions of the same components are partially omitted.
  • a leading edge side plate side end 4a1 which is an edge of the blade 4 close to the side plate 3 curved so as to be placed more radially outward as it becomes closer to the leading edge inner circumferential side end 4a2 in a plan view, in a region away from the side plate 3 (equal to a region located at the side plate opening), and the curved region expands so as to become away from that end as it becomes closer to the leading edge inner circumferential side end 4a2 in a side view.
  • the turbofan 30 has a folding line B heading gradually in the direction of the main plate 2, which is formed in the radially outward curving leading edge side plate side end 4a1 of the blade 4 and in the blade outer circumferential surface 4b at the leading edge inner circumferential side end 4a2 on the side of the side plate 3 so as to be directed toward the leading edge inner circumferential side end 4a2 of the blade 4 from the end in the rotational direction 4g1 in the blade outer circumferential surface 4b at the side plate joined portion 4g.
  • a rectangular-shaped concave groove 5 is formed in the blade inner circumferential surface 4c in the curved region so as to be substantially perpendicular to the folding line B and obliquely outwardly extend to the side of the main plate 2 from the side of the side plate 3 in relation to the rotational axis O.
  • the blade 4 is formed of a component constituting the blade outer circumferential surface and a component constituting the blade inner circumferential surface, and has a dual structure having a hollow formed therein. These two components are joined together at the leading edge side plate side end 4a1, and the distance between them becomes larger at a position further away from the leading edge side plate side end 4a1.
  • the groove bottom 5a of the concave groove 5 is formed with the component constituting the blade outer circumferential surface, so the depth of the concave groove 5 corresponds to the distance between the inner circumferential surface of the component constituting the blade outer circumferential surface and the inner circumferential surface of the component constituting the blade inner circumferential surface.
  • the turbofan 30 When driven by a fan motor in the rotational direction A, the turbofan 30 having the above structure draws air through the fan inlet opening 1a and substantially radially blows out the drawn air in the rotational direction through the fan outlet opening 1b, after passing through the blade 4.
  • the concave groove 5 extends obliquely so as to expand toward the side of the main plate 2 from the side of the side plate 3 in relation to the rotational axis O, thereby allowing the groove bottom 5a to rectify the air flow and suppress the turbulence, leading to further reduction in noise levels.
  • the groove bottom 5a of the concave groove 5 is formed to extend along the blade outer circumferential surface 4b, so as to make the thickness of the blade 4 smaller.
  • this arrangement prevents a surface sink due to smaller wall thickness even at a curved portion which tends to have a larger wall thickness, resulting in improved reliability in forming.
  • turbofan 30 if installed on an air conditioning apparatus 10 (see Fig. 1 ) having a ventilating pressure loss body such as a filter disposed at the fan inlet opening 1a thereof, prevents an air flow separation and maintains low noise levels even if dust gradually accumulates on the filter and results in increased air flow resistance.
  • a ventilating pressure loss body such as a filter disposed at the fan inlet opening 1a thereof
  • a turbofan according to the present invention can be widely used for household use and industrial use due to its low-noise and high manufacturing reliability.
  • such a turbofan can be widely used in home-use and industrial air conditioning apparatuses.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)

Claims (15)

  1. Turbosoufflante comprenant :
    une plaque principale en forme de disque (2) présentant un moyeu (2a) qui est une partie fixe à laquelle l'arbre de rotation (O) d'un moteur est fixé ;
    une plaque latérale annulaire (3) présentant une ouverture de plaque latérale formée au centre de celle-ci et formant une paroi de guidage de vent conjointement avec la plaque principale (2) ; et
    une pluralité de pales (4) montées de manière à s'étendre entre la plaque principale (2) et la plaque latérale (3) ;
    dans une vue en plan de la pale (4), chaque pale (4) étant positionnée plus loin de l'arbre de rotation (O), en allant d'un bord d'attaque de pale (4a) à un bord de fuite de pale (4e) ;
    dans laquelle
    une surface circonférentielle externe (4b) et une surface circonférentielle interne (4c) de la pale (4) au niveau du bord d'attaque de pale (4a) présentent une région centrale dans le sens de la hauteur sensiblement parallèle à l'arbre de rotation (O),
    caractérisée en ce que
    la pale présente une zone de socle proche de la plaque principale (2) qui est située plus radialement à l'extérieur de la plaque principale (2) en se rapprochant de la plaque principale (2) au niveau du bord d'attaque de pale (4a), et une autre zone de socle près de la plaque latérale (3) qui est située plus radialement à l'extérieur de la plaque latérale (3) en se rapprochant de la plaque latérale (3) au niveau du bord d'attaque de pale (4a), et
    la surface circonférentielle externe de pale (4b) du bord d'attaque de pale (4a) sur le côté de la plaque principale (2) s'incurve vers l'extérieur de la plaque principale (2).
  2. Turbosoufflante selon la revendication 1, dans laquelle la pale (4) est reliée sur son bord d'extrémité près de la plaque latérale (3) sur la plaque latérale (3) dans une région proche du bord de fuite de pale (4e) et est située sur l'ouverture de la plaque latérale à distance de la plaque latérale (3), dans une région proche du bord d'attaque de pale (4a), et le bord de fuite de pale (4e) de la pale (4) présente une forme ondulée présentant au moins deux points d'inflexion situés sur un cylindre théorique reliant des bords circonférentiels externes de la plaque principale (2) et de la plaque latérale (3) et présente une partie incurvée côté plaque principale faisant saillie vers une direction de rotation dans une région plus proche de la plaque principale (2) et une partie incurvée côté plaque latérale faisant saillie dans une direction de rotation opposée dans une région plus proche de la plaque latérale (3).
  3. Turbosoufflante selon la revendication 1, dans laquelle, dans une région située sur l'ouverture de la plaque latérale, un bord d'extrémité de la pale (4) proche de la plaque latérale (3) s'incurve de manière à être située plus radialement vers l'extérieur tandis que le bord d'extrémité se rapproche du bord d'attaque de pale (4a) dans une vue plane, et s'étend de manière à être positionnée plus loin du bord d'extrémité tandis que sa région incurvée se rapproche du bord d'attaque de pale (4a) dans une vue latérale.
  4. Turbosoufflante selon l'une quelconque des revendications 1 à 3, dans laquelle une ligne reliant une partie où le bord de fuite de pale (4e) est relié à la plaque principale (2) et une partie où le bord de fuite de pale (4e) est relié à la plaque latérale (3) est parallèle à l'arbre de rotation (O).
  5. Turbosoufflante selon l'une quelconque des revendications 1 à 4, dans laquelle la pale (4) présente une structure creuse de forme conique présentant un creux formé à l'intérieur de celle-ci où la distance entre la surface circonférentielle externe de pale (4b) et la surface circonférentielle interne de pale (4c) est progressivement inférieure vers la plaque latérale (3) depuis la plaque principale (2).
  6. Turbosoufflante selon l'une quelconque des revendications 1 à 5, dans laquelle une ligne centrale entre la surface circonférentielle externe de pale (4b) et la surface circonférentielle interne de pale (4c) est parallèle à l'arbre de rotation (O) dans une région où la pale (4) est reliée à la plaque latérale (3).
  7. Turbosoufflante selon la revendication 2 ou 4, dans laquelle, dans une vue latérale d'une extrémité du bord de fuite de pale (4e), une ligne inclinée reliant une saillie maximale (4ec2) dans la direction de rotation dans la partie incurvée côté plaque principale et une saillie maximale (4ec3) dans la direction opposée dans la partie incurvée de plaque latérale est inclinée de 10 à 30 degrés vers une ligne verticale reliant une partie de raccordement avec la plaque principale (2) et une partie de raccordement avec la plaque latérale (3).
  8. Turbosoufflante selon la revendication 2 ou 4, dans laquelle un angle de courbure circonférentiel (y), qui est un angle dans une vue en plan, créé par une ligne reliant un centre de l'arbre de rotation (O) et une intersection d'une ligne de cambrure horizontale indiquant une ligne centrale entre la surface circonférentielle externe de pale (4b) et la surface circonférentielle interne de pale (4c) et un bord circonférentiel externe de la plaque principale (2) dans une vue en plan de la partie de raccordement avec la plaque principale (2), et une ligne reliant le centre de l'arbre de rotation (O) et l'intersection de la ligne de cambrure horizontale indiquant la ligne centrale entre la surface circonférentielle externe de pale (4b) et la surface circonférentielle interne de pale (4c) et un bord circonférentiel de la plaque latérale (3) dans une vue plane de la partie de raccordement avec la plaque latérale (3) est de 5 à 15 degrés.
  9. Turbosoufflante selon la revendication 2 ou 4, dans laquelle une différence d'angle (Δβ2) entre un angle de sortie côté plaque principale, dans une vue en plan de la partie incurvée côté plaque principale, formé entre une tangente à une ligne de cambrure horizontale indiquant une ligne centrale entre la surface circonférentielle externe de pale (4b) et la surface circonférentielle interne de pale (4c) à une extrémité du bord de fuite de pale (4e) et une tangente à l'extrémité du bord de fuite de pale (4e) vers un cercle passant par l'extrémité du bord de fuite de pale (4e) et présentant son centre au centre de l'arbre de rotation (O), et un angle de sortie côté plaque latérale, dans une vue en plan de la partie incurvée côté plaque latérale, entre une tangente vers la ligne de cambrure horizontale indiquant la ligne centrale entre la surface circonférentielle externe de pale (4b) et la surface circonférentielle interne de pale (4c) à l'extrémité du bord de fuite de pale (4e) et une tangente à l'extrémité du bord de fuite de pale (4e) vers le cercle passant par l'extrémité du bord de fuite de pale (4e) présentant son centre au centre de l'arbre de rotation (O), est de 20 à 35 degrés.
  10. Turbosoufflante selon la revendication 3, dans laquelle, dans une vue latérale, un angle de courbure (ε) qui est un angle formé entre une tangente à une extrémité du bord d'attaque de pale (4a) vers la ligne de cambrure verticale indiquant la ligne centrale entre la surface circonférentielle externe de pale (4b) et la surface circonférentielle interne de pale (4c) et l'arbre de rotation (O) est de 25 à 45 degrés.
  11. Turbosoufflante selon l'une quelconque des revendications 1 à 10, dans laquelle, à une extrémité du bord d'attaque de pale (4a) dans une vue en plan, un angle d'entrée côté plaque latérale de pale qui est un angle d'entrée à une position plus proche de la plaque latérale (3), une angle d'entrée médian de pale qui est un angle d'entrée au milieu de la plaque latérale (3) et de la plaque principale (2) dans le sens de la hauteur, et un angle d'entrée côté plaque principale de pale qui est un angle d'entrée à une position plus proche de la plaque principale (2) présentent un rapport de « l'angle d'entrée médian de pale > l'angle d'entrée médian côté plaque principale de pale > l'angle d'entrée côté plaque latérale de pale ».
  12. Turbosoufflante selon la revendication 11, dans laquelle à l'extrémité du bord d'attaque de pale (4a) dans une vue en plan, une différence d'angle (Δβ1) entre un angle d'entrée circonférentiel interne médian de pale qui est un angle d'entrée sur une extrémité latérale circonférentielle interne au milieu de la plaque latérale (3) et de la plaque principale (2) dans le sens de la hauteur et un angle d'entrée côté plaque latérale de pale qui est un angle d'entrée à une extrémité plus proche de la plaque latérale (3) est de 10 à 20 degrés.
  13. Turbosoufflante selon la revendication 3, dans laquelle une rainure concave (5) est formée sur la surface circonférentielle interne de pale dans la région incurvée de la pale (4) de manière à s'étendre vers une extrémité proche de la plaque latérale (3), une ligne de pliage (B) est définie à une limite de la région incurvée et de la surface circonférentielle interne de pale à l'exception de la région incurvée, et la rainure concave (5) est sensiblement parallèle à la ligne de pliage (B) ;
    dans laquelle, éventuellement, la rainure concave (5) présente une section rectangulaire et se réduit progressivement vers une extrémité proche de la plaque latérale (3).
  14. Appareil de climatisation, dans lequel la turbosoufflante selon l'une quelconque des revendications 1 à 13 est montée, et une unité de perte de pression d'aération (12) est disposée au niveau d'une ouverture d'entrée d'air de la turbosoufflante.
  15. Appareil de climatisation, dans lequel la turbosoufflante selon l'une quelconque des revendications 1 à 13 est montée, et une unité de perte de pression d'aération (12) est disposée au niveau d'une ouverture de sortie d'air de la turbosoufflante.
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JP5283691B2 (ja) 2013-09-04
CN101960150B (zh) 2014-04-02
EP2264320A1 (fr) 2010-12-22
JP5669877B2 (ja) 2015-02-18
CN101960150A (zh) 2011-01-26
JP2013117233A (ja) 2013-06-13
WO2009128299A1 (fr) 2009-10-22
JPWO2009128299A1 (ja) 2011-08-04
ES2686246T3 (es) 2018-10-17
AU2009237152B2 (en) 2012-07-05
EP2264320A4 (fr) 2015-04-15

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