EP3093500B1 - Zentrifugalgebläse, klimaanlage und luftreinigungsvorrichtung - Google Patents

Zentrifugalgebläse, klimaanlage und luftreinigungsvorrichtung Download PDF

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Publication number
EP3093500B1
EP3093500B1 EP14878132.1A EP14878132A EP3093500B1 EP 3093500 B1 EP3093500 B1 EP 3093500B1 EP 14878132 A EP14878132 A EP 14878132A EP 3093500 B1 EP3093500 B1 EP 3093500B1
Authority
EP
European Patent Office
Prior art keywords
subflow
main plate
centrifugal fan
base
air
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
EP14878132.1A
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English (en)
French (fr)
Other versions
EP3093500A4 (de
EP3093500A1 (de
Inventor
Takashi Ikeda
Atsushi Kono
Masahiko Takagi
Makoto Kurihara
Kiyoshi Yoshimura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP3093500A1 publication Critical patent/EP3093500A1/de
Publication of EP3093500A4 publication Critical patent/EP3093500A4/de
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Publication of EP3093500B1 publication Critical patent/EP3093500B1/de
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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
    • F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
    • F04D17/08—Centrifugal pumps
    • F04D17/16—Centrifugal pumps for displacing without appreciable compression
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
    • 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
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
    • F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
    • F04D29/684—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid injection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F04D25/12—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit being adapted for mounting in apertures

Definitions

  • the present invention relates to a centrifugal fan, an air-conditioning apparatus, and an air-cleaning apparatus.
  • JP11-270493 discloses a centrifugal fan
  • JP2007-198280 discloses a centrifugal fan.
  • JP2000205195 discloses an impeller of centrifugal blower and air conditioner.
  • JP54-168607U discloses a motor cooling device of a centrifugal blower convenient for use in an automotive air-conditioning system.
  • a ceiling-concealed air-conditioning apparatus has an air inlet and air outlets formed at a lower surface of the apparatus facing a room to be air-conditioned. Then, air sucked into a case through the air inlet is adjusted in temperature by a heat exchanger mounted in a ceiling in the case, and is then fed into the room through the air outlets.
  • the above-mentioned airflow in the air-conditioning apparatus is generated by a centrifugal fan configured to suck the air upward from below and blow out the sucked air in a flow direction changed to a radially outward direction.
  • the centrifugal fan includes a shroud, a main plate, and a plurality of blades arranged between the shroud and the main plate.
  • an air-conditioning apparatus configured to generate, when the airflow changed from an upward direction to the radially outward direction using the above-mentioned centrifugal fan (airflow flowing between the main plate and the shroud of the centrifugal fan) is defined as a main flow, a subflow in which air travels from outside (upper side) of the main plate to inside of the main plate.
  • a guide is formed at a center of a main plate on its upper side to cause such an airflow as to move along inside and outside the guide, thus generating a subflow.
  • a drive motor of a centrifugal fan is arranged at the center of the main plate on its upper side, and it is expected to obtain a drive motor cooling effect through the subflow.
  • the subflow tends to have a narrow path as compared to the main flow, and hence there is a risk in that flow turbulence is liable to occur correspondingly.
  • the present invention has been made in view of the above, and an object of the present invention is to provide a centrifugal fan capable of obtaining a subflow that is less liable to cause turbulence.
  • the present invention provides a centrifugal fan as set forth in claim 1, and an air conditioning apparatus as set forth in claim 6 and a cleaning apparatus as set forth in claim 7.
  • Advantageous additional features are defined in claims 2-5.
  • the subflow that is less liable to cause turbulence can be obtained in the centrifugal fan.
  • FIG. 1 is a view for illustrating a mounted state of an air-conditioning apparatus according to a first embodiment of the present invention.
  • FIG. 2 is a side view for illustrating the internal structure of the air-conditioning apparatus according to the first embodiment.
  • FIG. 3 is a plan view for illustrating the internal structure of the air-conditioning apparatus according to the first embodiment.
  • FIG. 4 is a view for illustrating a centrifugal fan and its peripheral portion according to the first embodiment in the same manner as FIG. 2 .
  • FIG. 5 is an enlarged view for illustrating a guide portion and its peripheral portion according to the first embodiment (enlarged view of a portion V in FIG. 4 ) .
  • An air-conditioning apparatus 100 is an indoor unit of a so-called package air conditioner, and a most part of the air-conditioning apparatus 100 is concealed in a ceiling of a room 15 being a space to be air-conditioned. A state in which a lower portion of a case 1 of the air-conditioning apparatus 100 is viewed up from inside the room is illustrated in FIG. 1 .
  • the air-conditioning apparatus 100 includes the case 1 concealed in a ceiling 15a of the space to be air-conditioned (room 15).
  • the case 1 is formed into an approximately rectangular parallelepiped shape.
  • the case 1 has an upper surface 1a, a side surface 1b, and a decorative panel 2 being a lower surface.
  • the upper surface 1a and the side surface 1b are each formed of a sheet metal member.
  • a heat insulator 1c is arranged inside each of the upper surface 1a and the side surface 1b, and an air path wall surface is formed by the upper surface 1a and the side surface 1b formed as described above.
  • the side surface 1b includes four main surfaces 21 oriented along two orthogonal axes, and further includes corner portions 22 between corresponding two main surfaces 21.
  • the side surface 1b is formed into a tubular shape extending in a vertical direction. An upper portion of the side surface 1b is closed by the upper surface 1a, and the decorative panel 2 is mounted in a ceiling at a lower portion of the side surface 1b.
  • the case 1 is formed into an approximately box shape by the upper surface 1a, the side surface 1b, and the decorative panel 2.
  • At least one air inlet 2a and at least one air outlet 2b are formed at a lower portion of the case 1, namely, the decorative panel 2 according to the first embodiment.
  • the air-conditioning apparatus 100 according to the first embodiment has one air inlet 2a and four air outlets 2b as described later.
  • a centrifugal fan (turbofan) 3 serving as an air blowing unit, a fan motor 4, a bellmouth 5, and a heat exchanger 6 are accommodated in the case 1.
  • the centrifugal fan 3 generates a stream of air that is sucked into the case 1 through the air inlet 2a and blown out into the target space through the air outlets 2b.
  • the heat exchanger 6 is arranged in such an air flow path and is configured to adjust air temperature.
  • the air inlet 2a is formed at a central portion of the decorative panel 2 over a wide region in the decorative panel 2. Further, the air inlet 2a according to the first embodiment is formed as a grille-type air inlet, but the present invention is not limited thereto .
  • a filter 14 configured to remove dust from air having passed through the air inlet 2a is arranged on an upstream side of the air inlet 2a (on an inner side of the case 1).
  • the decorative panel 2 and the air inlet 2a each have a rectangular perimeter in plan view.
  • the plurality of air outlets 2b are formed in a region between the perimeter of the decorative panel 2 and the perimeter of the air inlet 2a.
  • the four air outlets 2b are formed correspondingly to the four-side perimeters of the decorative panel 2 and the air inlet 2a, and the respective air outlets 2b are formed so as to extend along corresponding sides of the decorative panel 2 and the air inlet 2a except for the corner portions to be described later. Further, the four air outlets 2b are positioned so as to surround the air inlet 2a.
  • Each of the air outlets 2b includes an airflow direction flap 2c configured to adjust a direction of air to be blown out.
  • the fan motor 4 is arranged in a central portion inside the case 1.
  • the fan motor 4 is supported on a lower surface of the upper surface 1a of the case 1 (internal space side of the case) .
  • the centrifugal fan 3 is mounted to a rotary shaft of the fan motor 4, which extends downward. Further, the bellmouth 5 forming a suction air path directed from the air inlet 2a toward the centrifugal fan 3 is arranged between the centrifugal fan 3 and the air inlet 2a.
  • the centrifugal fan 3 is configured to suck air into the case 1 through the air inlet 2a and blow out the air through the air outlets 2b into the room (room inside) 15 being a target space.
  • the heat exchanger 6 being an example of a pressure loss unit is arranged radially outside the centrifugal fan 3.
  • the heat exchanger 6 is arranged in the air flow path formed by the centrifugal fan 3 inside the case and is configured to exchange heat between the air and refrigerant.
  • the heat exchanger 6 includes a plurality of fins arranged at predetermined intervals and a heat transfer tube penetrating the fins.
  • the heat transfer tube is connected to a publicly-known outdoor unit (not shown) by a connection pipe. With this, cooled refrigerant or heated refrigerant is supplied to the heat exchanger 6.
  • a space is formed outside the heat exchanger connecting plate 7 between the heat exchange connecting plate 7 and a side surface heat insulator 1d.
  • a top and a bottom of the space are closed by the upper surface 1a and a drain pan 12, respectively, to form a piping accommodation space 10.
  • a header 8 and a distributor 9, which are connected to a heat transfer tube 6b extending from one end 6a among the two ends 6a, are arranged inside the piping accommodation space 10.
  • the drain pan 12 which is configured to temporarily store condensed water, is arranged below the heat exchanger 6. Further, an electrical component box 13 configured to accommodate an electronic circuit board is arranged on a back side of the drain pan 12. Configurations and modes of the centrifugal fan 3, the bellmouth 5, and the heat exchanger 6 are not particularly limited, but publicly-known types are used in the first embodiment.
  • the thus blown out air is subjected to heat exchange and humidity adjustment when passing through the heat exchanger 6 being the pressure loss unit, and is thereafter blown out into the room 15 through the respective air outlets 2b while the flow direction is changed to a downward direction. Further, the air blowing out into the room 15 is controlled in airflow direction by the airflow direction flap 2c.
  • the main flow is a flow indicated by the arrows B and C1 as described above.
  • the main flow is an airflow that flows out of the bellmouth 5, flows into the centrifugal fan 3, flows through a space between a main plate 3b and a shroud 3g of the centrifugal fan 3, which are described later, and flows out of the fan air outlet 3i.
  • the subflow is a flow indicated by the arrows C2, E1, and E2.
  • the subflow is an airflow that passes from a space radially outside the fan air outlet 3i to flow through an upper side of the centrifugal fan 3 (between the centrifugal fan 3 and the upper surface 1a) and flows into the centrifugal fan 3 from a central portion in a vicinity of a rotation axis to join the main flow, and the detail of the subflow is described later.
  • the centrifugal fan 3 includes a plurality of blades 3a, the main plate 3b, and the shroud 3g.
  • the shroud 3g is an annular member in plan view, which forms a suction/guide flow path to the blades 3a.
  • the shroud 3g is arranged so as to be opposed to the main plate 3b in a direction of a rotation axis RA of the centrifugal fan 3 and to be away from the main plate 3b in the direction of the rotation axis RA of the centrifugal fan 3.
  • the main plate 3b is arranged on the upper surface 1a side of the case 1, and the shroud 3g is arranged on the bellmouth 5 side.
  • the plurality of blades 3a are welded between the shroud 3g and the main plate 3b. In other words, one end of each blade 3a is welded to the main plate 3b, and the other end of each blade 3a is welded to the shroud 3g.
  • the main plate 3b includes a base 3cd, a hub 3c, and a guide portion 51. At least the guide portion 51 and the base 3cd are formed by integral molding. As an example, according to the first embodiment, the base 3cd, the hub 3c, and the guide portion 51 are formed by integral molding.
  • the hub 3c projects toward the shroud 3g in a central portion of the main plate 3b (rotation axis RA of the centrifugal fan 3 and its vicinity).
  • the hub 3c has a diameter reduced as approaching the rotation axis RA side, and has a portion approaching the shroud 3g as approaching the rotation axis RA side.
  • the above-mentioned fan motor 4 is arranged inside a fan central portion outside air path 3f located outside (on an upper side of) the hub 3c.
  • An outer surface of a rotating wall 30 to be described later is an upper surface of the rotating wall 30, an inner surface of the rotating wall 30 is a lower surface (surface on the hub 3c side, surface on the shroud 3g side) of the rotating wall 30, and an outer surface of the hub 3c is an upper surface (surface on the rotating wall 30 side) of the hub 3c and is an inner surface (surface on the shroud 3g side) of the hub 3c.
  • a boss 3h configured to fix the rotary shaft 4a of the fan motor 4 is integrally molded at a projected end 3cb of the hub 3c.
  • the base 3cd is a portion located on a periphery of the hub 3c.
  • the base 3cd is an annular portion having a circular perimeter in plan view. Further, as an example, the base 3cd is an approximately flat, plate-like portion and extends along one plane.
  • the guide portion 51 is positioned outside the hub 3c.
  • the guide portion 51 includes the rotating wall 30 and an induction portion 31.
  • the rotating wall 30 extends to be inclined with respect to a direction in which the base 3cd extends when viewed in vertical section (viewed in FIG. 4 and FIG. 5 ).
  • the rotating wall 30 extends away from the hub 3c and forms a part of the subflow path with the hub 3c.
  • the rotating wall 30 is configured to guide the subflow, which has flowed outside the rotating wall 30 as indicated by the reference symbol E1, so as to flow in a flow path between the inside of the rotating wall 30 and the outside of the hub 3c as indicated by the reference symbol E2, and further to guide the subflow to subflow outlets 3d formed in the main plate 3b.
  • the induction portion 31 is formed on an outer surface of the guide portion 51 on an upstream side of the rotating wall 30 (upstream side of the subflow).
  • the induction portion 31 is a round portion smoothly connecting an outer surface of the base 3cd with the outer surface of the rotating wall 30, and is a surface curved so as to expand toward outside the guide portion 51.
  • the induction portion 31 is configured to suppress separation of the subflow, which flows from outside the base 3cd to outside the rotating wall 30.
  • At least one subflow outlet 3d (a plurality of subflow outlets in the first embodiment) being a through-hole connecting the outside of the main plate 3b (fan central portion outside air path 3f) with the inside of the main plate 3b (fan inside air path 3e) is formed in the main plate 3b. More specifically, in a direction in which the rotation axis RA extends, the subflow outlet 3d is arranged on a side closer to the base 3cd than a distal end opening portion 30a being a distal end of the rotating wall 30 on the shroud 3g side. Specifically, the distal end opening portion 30a is formed in the hub 3c.
  • a flat surface 32 is formed between a defining portion 3s of the subflow outlet 3d formed in the main plate 3b and the inner surface of the rotating wall 30.
  • the flat surface 32 is a guide surface configured to guide the subflow to the subflow outlet 3d formed in the main plate 3b.
  • a part of air having flowed out of the fan air outlet 3i flows radially inward (flows toward the rotation axis RA) through a gap between the outer surface of the base 3cd and the heat insulator 1c on the upper surface 1a side as indicated by the reference symbol C2, flows through the induction portion 31 from the outer surface of the base 3cd along the outer surface of the rotating wall 30 as indicated by the reference symbol E1, further flows radially outward through a gap between the inner surface of the rotating wall 30 and the outer surface of the hub 3c as indicated by the reference symbol E2, and flows out of the subflow outlet 3d into the space between the main plate 3b and the shroud 3g (fan inside air path 3e) to join the main flow.
  • the thus constructed centrifugal fan and air-conditioning apparatus can achieve the following advantages.
  • the induction portion formed of a curved surface is formed upstream of the rotating wall, and hence when the subflow flows through the fan central portion outside air path, the effect that the airflow is not liable to be separated but flows along the outer surface of the rotating wall is obtained, thereby being capable of obtaining the subflow that is less liable to cause turbulence.
  • the subflow does not flow along the outer surface of the rotating wall when flowing in the fan central portion outside air path, noise due to turbulence is increased or motor cooling performance is decreased due to reduction of an effective passage area.
  • the subflow that is less liable to cause turbulence can be obtained.
  • increase in noise can be prevented, and reliability in motor drive can be improved owing to a sufficient motor cooling effect.
  • the flat surface being the guide surface to the subflow outlet is formed, and hence the first embodiment is also advantageous in that, when the subflow flows between the outer surface of the hub and the inner surface of the rotating wall, the subflow can flow smoothly without stagnating due to collision of the subflow having flowed extremely far over the subflow outlet with its subsequent subflow or disturbance caused by its subsequent subflow.
  • the airflow after cooling the motor which is discharged from the subflow outlet to the fan inside air path, is discharged to a region near a corner portion where a hub extension direction intersects with a base extension direction, and hence turbulence at a time when the subflow joins the main flow can be suppressed, thus also leading to noise reduction.
  • the guide portion and the base are formed by integral molding, and hence a continuous surface having extremely few irregularities can be obtained in a region from the outer surface of the base through the induction portion to the outer surface of the rotating wall. Also with this, turbulence of the subflow can be reduced.
  • the guide surface and the defining portion of the subflow outlet are flush with each other.
  • the guide surface is continuous with the defining portion of the subflow outlet, and the defining portion of the subflow outlet is an exit portion of a surface forming the guide surface. Therefore, losses in subflow due to the irregularities can be suppressed, and turbulence of the subflow can be reduced by providing the air outlet portion having extremely few irregularities.
  • FIG. 6 and FIG. 7 are views for illustrating the second embodiment in the same manner as FIG. 4 and FIG. 5 , respectively.
  • FIG. 8 is a perspective view for illustrating a guide portion according to the second embodiment.
  • the second embodiment is the same as the above-mentioned first embodiment except for parts to be described below.
  • a main plate 203b includes the base 3cd, the hub 3c, and a guide portion 251.
  • the guide portion 251 is positioned outside the hub 3c, and includes the rotating wall 30, the induction portion 31, and a flange portion 233.
  • the flange portion 233 extends radially outward along the base 3cd.
  • the guide portion 251 is a member separate from the base 3cd and the hub 3c, and is welded to at least the base 3cd or the hub 3c. According to the second embodiment, the flange portion 233 of the guide portion 251 is held in surface contact with the base 3cd, and the guide portion 251 is welded to the outer surface of the base 3cd at an inner surface of the flange portion 233.
  • the inner surface of the rotating wall 30 includes a guide surface 232 configured to guide the subflow to the subflow outlet 3d formed in the main plate 3b.
  • the guide surface 232 is formed so as to be flush with the defining portion 3s of the subflow outlet 3d formed in the main plate 3b.
  • the subflow that is less liable to cause turbulence can be obtained.
  • increase in noise can be prevented, and reliability in motor drive can be improved owing to a sufficient motor cooling effect.
  • the guide surface to the subflow outlet is formed, and hence, as in the first embodiment, there is obtained an advantage in that, when the subflow flows between the outer surface of the hub and the inner surface of the rotating wall, the subflow can flow smoothly without stagnating due to collision of the subflow having flowed extremely far over the subflow outlet with its subsequent subflow or disturbance caused by its subsequent subflow.
  • the airflow after cooling the motor which is discharged from the subflow outlet to the fan inside air path, is discharged to the region near the corner portion where the hub extension direction intersects with the base extension direction, and hence turbulence at a time when the subflow joins the main flow can be suppressed, thus also leading to noise reduction.
  • the guide portion is the member separate from the base and the hub, and hence even when the motor is changed in size, replacement of the guide portion is only necessary.
  • the guide portion is the member separate from the base and the hub, and hence even when the motor is changed in size, replacement of the guide portion is only necessary.
  • the guide portion is welded to the base of the main plate at the flange portion.
  • a large area can be secured for welding between the guide portion and the base, and the adhesion between the guide portion and the base can be improved to enhance the connection strength.
  • the guide portion is held in contact with the outer surface of the base at the inner surface of the flange portion, and hence the guide portion can be reliably prevented from dropping down.
  • FIG. 9 to FIG. 11 are views for illustrating the third embodiment in the same manner as FIG. 6 to FIG. 8 , respectively.
  • the third embodiment is the same as the corresponding configuration of the above-mentioned first or second embodiment except for parts to be described below.
  • a main plate 303b includes the base 3cd, the hub 3c, and a guide portion 351.
  • the guide portion 351 includes the rotating wall 30, an induction portion 331, and the flange portion 233.
  • the induction portion 331 is a recessed portion that opens toward outside the guide portion 351.
  • the guide portion 351 is a member separate from the base 3cd and the hub 3c, and is welded to at least the base 3cd or the hub 3c. According to the third embodiment, the guide portion 351 is welded to the outer surface of the base 3cd at the inner surface of the flange portion 233.
  • the inner surface of the rotating wall 30 includes the guide surface 232 configured to guide the subflow to the subflow outlet 3d formed in the main plate 3b.
  • the guide surface 232 is formed so as to be flush with the defining portion 3s of the subflow outlet 3d formed in the main plate 3b.
  • the induction portion formed of the recessed portion is formed upstream of the rotating wall, and hence when the subflow flows into the fan central portion outside airpath, the subflow is attracted toward the outer surface of the guide portion by a negative pressure caused by the recessed portion, and the effect that the airflow is not liable to be separated but flows along the outer surface of the rotating wall is thus obtained, thereby being capable of obtaining the subflow that is less liable to cause turbulence. Therefore, as in the first embodiment, the subflow that is less liable to cause turbulence can be obtained. Thus, increase in noise can be prevented, and reliability in motor drive can be improved owing to a sufficient motor cooling effect.
  • the guide surface to the subflow outlet is formed, and hence, as in the first embodiment, there is obtained an advantage in that, when the subflow flows between the outer surface of the hub and the inner surface of the rotating wall, the subflow can flow smoothly without stagnating due to collision of the subflow having flowed extremely far over the subflow outlet with its subsequent subflow or disturbance caused by its subsequent subflow.
  • the airflow after cooling the motor which is discharged from the subflow outlet to the fan inside air path, is discharged to the region near the corner portion where the hub extension direction intersects with the base extension direction, and hence turbulence at a time when the subflow joins the main flow can be suppressed, thus also leading to noise reduction.
  • the guide portion is the member separate from the base and the hub, and hence even when the motor is changed in size, replacement of the guide portion is only necessary.
  • the guide portion is the member separate from the base and the hub, and hence even when the motor is changed in size, replacement of the guide portion is only necessary.
  • the guide portion is welded to the base of the main plate at the flange portion.
  • a large area can be secured for welding between the guide portion and the base, and the adhesion between the guide portion and the base can be improved to enhance the connection strength.
  • the guide portion is held in contact with the outer surface of the base at the inner surface of the flange portion, and hence the guide portion can be reliably prevented from dropping down.
  • FIG. 12 and FIG. 13 are views for illustrating the fourth embodiment in the same manner as FIG. 6 and FIG. 8 , respectively.
  • the fourth embodiment is the same as the corresponding configurations of the above-mentioned first to third embodiments except for parts to be described below.
  • a main plate 403b includes the base 3cd, the hub 3c, and a guide portion 451.
  • the guide portion 451 includes the rotating wall 30 and the induction portion 331.
  • the induction portion 331 is a recessed portion that opens toward outside the guide portion 451.
  • the guide portion 451 is a member separate from the base 3cd and the hub 3c, and is welded to at least the base 3cd or the hub 3c. According to the fourth embodiment, the guide portion 451 is welded to the outer surface of the hub 3c at an inner surface of the guide portion 451, which is positioned on an opposite side to the induction portion 331. Further, an upper end of the guide portion 451, which is an end on an opposite side to the distal end opening portion 30a (lower end after assembly), is flush with the outer surface of the base 3cd of the main plate 403b.
  • the inner surface of the rotating wall 30 includes the guide surface 232 configured to guide the subflow to the subflow outlet 3d formed in the main plate 3b.
  • the guide surface 232 is formed so as to be flush with the defining portion 3s of the subflow outlet 3d formed in the main plate 3b.
  • the induction portion formed of the recessed portion is formed upstream of the rotating wall, and hence when the subflow flows into the fan central portion outside airpath, the subflow is attracted toward the outer surface of the guide portion by a negative pressure caused by the recessed portion, and the effect that the airflow is not liable to be separated but flows along the outer surface of the rotating wall is thus obtained, thereby being capable of obtaining the subflow that is less liable to cause turbulence. Therefore, as in the first embodiment, the subflow that is less liable to cause turbulence can be obtained. Thus, increase in noise can be prevented, and reliability in motor drive can be improved owing to a sufficient motor cooling effect.
  • the guide surface to the subflow outlet is formed, and hence, as in the first embodiment, there is obtained an advantage in that, when the subflow flows between the outer surface of the hub and the inner surface of the rotating wall, the subflow can flow smoothly without stagnating due to collision of the subflow having flowed extremely far over the subflow outlet with its subsequent subflow or disturbance caused by its subsequent subflow.
  • the airflow after cooling the motor which is discharged from the subflow outlet to the fan inside air path, is discharged to the region near the corner portion where the hub extension direction intersects with the base extension direction, and hence turbulence at a time when the subflow joins the main flow can be suppressed, thus also leading to noise reduction.
  • the guide portion is the member separate from the base and the hub, and hence even when the motor is changed in size, replacement of the guide portion is only necessary.
  • the guide portion is the member separate from the base and the hub, and hence even when the motor is changed in size, replacement of the guide portion is only necessary.
  • the upper end of the guide portion is flush with the outer surface of the base of the main plate, and hence turbulence due to the irregularities can be prevented from occurring immediately behind the induction portion in the subflow, which flows on the outer surface of the base of the main plate.
  • the centrifugal fan may have an embodiment in which the configuration of the first embodiment, including the induction portion 31 being the round portion, is combined with the configuration as in the fourth embodiment, in which the base 3cd and the hub 3c are the members separate from a guide portion 551, and the guide portion 551 is welded to the outer surface of the hub 3c at the inner surface of the guide portion 551, which is positioned on an opposite side to the induction portion 31.
  • the centrifugal fan may have an embodiment in which the configuration as in the first embodiment, in which the base 3cd and the hub 3c are molded integrally with a guide portion 651 to form a main plate 603b, is combined with the configuration of the third or fourth embodiment, including the induction portion 331 being the recessed portion.
  • the subflow is described as the flow serving as a cooling flow for the motor positioned in the fan central portion outside air path.
  • the present invention is not limited thereto.
  • Some devices having a centrifugal fan may adopt a layout in which a fan motor is not arranged in the fan central portion outside air path.
  • the present invention may also be carried out as structure capable of reducing an influence of turbulence caused by the presence of the dead region through obtainment of the subflow in the layout in which a fan motor is not arranged in the fan central portion outside air path.
  • the heat exchanger illustrated in the above-mentioned embodiments is merely an example of the pressure loss unit arranged in the air flow path formed by the centrifugal fan in the air-conditioning apparatus. Therefore, for example, an air-cleaning filter may be given as a pressure loss unit arranged in an air flow path formed by a centrifugal fan in an air-cleaning apparatus. In other words, the present invention may also be carried out as the air-cleaning apparatus.
  • 3 centrifugal fan 3a blade, 3b, 203b, 303b, 403b, 603b main plate, 3c hub, 3cd base, 3d subflow outlet, 3e fan inside air path, 3f fan central portion outside air path, 3g shroud, 30 rotating wall, 30a distal end opening portion, 31, 331 induction portion, 32 flat surface, 51, 251, 351, 451, 551, 651 guide portion, 100 air-conditioning apparatus, 232 guide surface, 233 flange portion

Claims (7)

  1. Zentrifugalgebläse (3), das Folgendes umfasst:
    eine Hauptplatte (3b, 203b, 303b, 403b, 603b);
    eine Abdeckung (3g); und
    eine Vielzahl von Schaufeln (3a), die zum Erzeugen einer Hauptströmung zwischen der Hauptplatte (3b, 203b, 303b, 403b, 603b) und der Abdeckung (3g) zwischen der Abdeckung (3g) und der Hauptplatte (3b, 203b, 303b, 403b, 603b) angeordnet sind,
    wobei die Hauptplatte (3b, 203b, 303b, 403b, 603b) eine Basis (3cd) und eine Nabe (3c) umfasst,
    wobei die Nabe (3c) in Richtung der Abdeckung (3g) in einem Mittelabschnitt der Hauptplatte (3b, 203b, 303b, 403b, 603b) hervorsteht,
    wobei die Basis (3cd) auf einem Umfang der Nabe (3c) angeordnet ist,
    wobei sich im Folgenden die Begriffe "innerhalb" und "innere/r/s", wenn diese keiner radialen Richtung zugeordnet sind, auf einen Raum beziehen, der zwischen der Hauptplatte (3b, 203b, 303b, 403b, 603b) und der Abdeckung (3g) ausgebildet ist, oder auf eine Seite eines Elements beziehen, die diesem Raum zugewandt ist, und wobei sich im Gegensatz dazu die Begriffe "außerhalb" und "äußere/r/s", wenn diese nicht der radialen Richtung zugeordnet sind, auf die Außenseite des Raums oder auf eine Seite eines Elements beziehen, die von dem Raum abgewandt ist,
    wobei zumindest ein Durchgangsloch in der Hauptplatte (3b, 203b, 303b, 403b, 603b) ausgebildet ist, durch das die Außenseite der Hauptplatte (3b, 203b, 303b, 403b, 603b) mit der Innenseite der Hauptplatte (3b, 203b, 303b, 403b, 603b) verbunden ist,
    wobei eine Nebenströmung von einem Raum radial außerhalb eines Gebläseluftauslasses (3i) entlang einer Außenoberfläche der Basis (3cd) der Hauptplatte (3b, 203b, 303b, 403b, 603b) in Richtung einer Drehachse (RA) des Zentrifugalgebläses (3) und schließlich durch das Durchgangsloch strömt, um sich mit der Hauptströmung zu vereinen, so dass das Durchgangsloch den Nebenströmungsauslass (3d) bildet,
    wobei die Hauptplatte (3b, 203b, 303b, 403b, 603b) ferner einen Leitabschnitt (51, 251, 351, 451, 551, 651) umfasst, der außerhalb der Nabe (3c) angeordnet ist,
    wobei der Leitabschnitt (51, 251, 351, 451, 551, 651) eine rotierende Wand (30) umfasst,
    wobei die rotierende Wand (30) von der Nabe (3c) beabstandet ist, um einen Spalt zwischen einer Innenoberfläche der rotierenden Wand (30) und einer Außenoberfläche der Nabe (3c) zu bilden,
    wobei sich die rotierende Wand (30) erstreckt, um in Bezug auf eine Richtung geneigt zu sein, in die sich die Basis (3cd) erstreckt, wenn sie im Querschnitt von einer Ebene aus betrachtet wird, die die Rotationsachse (RA) des Zentrifugalgebläses (3) einschließt,
    wobei der Leitabschnitt (51, 251, 351, 451, 551, 651) ferner einen Induktionsabschnitt (31, 331) umfasst, der die Außenoberfläche der Basis (3cd) mit einer Außenoberfläche der rotierenden Wand (30) verbindet,
    wobei der Induktionsabschnitt (31, 331) auf einer Außenoberfläche des Leitabschnitts (51, 251, 351, 451, 551, 651) auf einer Nebenströmungs-Stromaufseite der rotierenden Wand (30) ausgebildet ist,
    wobei die Nebenströmung entlang der Außenoberfläche der rotierenden Wand (30) strömt, ferner radial nach außen durch den Spalt strömt und schließlich den Nebenströmungsauslass (3d) erreicht,
    dadurch gekennzeichnet, dass:
    der Leitabschnitt (51, 651) und die Basis (3cd) durch einstückiges Formen ausgebildet sind und eine flache Oberfläche (32) zwischen einem definierenden Abschnitt (3s) des Nebenströmungsauslasses (3d), der in der Hauptplatte (3b, 203b, 303b, 403b, 603b) ausgebildet ist, und der Innenoberfläche der rotierenden Wand (30) gebildet ist,
    oder dadurch, dass:
    der Leitabschnitt (251, 351, 451, 551) zumindest mit der Basis (3cd) oder der Nabe (3c) verschweißt ist, eine Innenoberfläche der rotierenden Wand (30) eine Leitfläche (232) umfasst, die ausgelegt ist, um die Nebenströmung an den Nebenströmungsauslass (3d) zu leiten, der in der Hauptplatte ausgebildet ist, und die Leitfläche (232) mit einem definierenden Abschnitt (3s) des Nebenströmungsauslasses (3d), der in der Hauptplatte ausgebildet ist, bündig ist.
  2. Zentrifugalgebläse (3) nach Anspruch 1, wobei der Induktionsabschnitt (31, 331) einen runden Abschnitt umfasst.
  3. Zentrifugalgebläse (3) nach Anspruch 1, wobei der Induktionsabschnitt (31, 331) einen vertieften Abschnitt umfasst, der sich in Richtung der Außenseite des Leitabschnitts (51, 251, 351, 451, 551, 651) öffnet.
  4. Zentrifugalgebläse (3) nach einem der Ansprüche 1 bis 3 in der Option, wobei der Leitabschnitt verschweißt ist, wobei der Leitabschnitt (251, 351, 451, 551, 651) mit einer Außenoberfläche der Nabe (3c) verschweißt ist.
  5. Zentrifugalgebläse (3) nach einem der Ansprüche 1 bis 3 in der Option, wobei der Leitabschnitt verschweißt ist, wobei der Leitabschnitt (251, 351, 451, 551, 651) einen Flanschabschnitt (233) umfasst, der sich entlang der Basis (3cd) erstreckt,
    wobei der Flanschabschnitt (233) in Oberflächenkontakt mit der Basis (3cd) gehalten ist und
    wobei der Leitabschnitt (251, 351, 451, 551, 651) am Flanschabschnitt (233) mit der Basis (3cd) verschweißt ist.
  6. Klimaanlagengerät (100), das Folgendes umfasst:
    ein Gehäuse (1);
    einen Wärmetauscher (6), der an einer Oberseite in dem Gehäuse (1) montiert ist; und
    ein Zentrifugalgebläse (3) nach einem der Ansprüche 1 bis 5, wobei das Zentrifugalgebläse (3) an der Oberseite in dem Gehäuse (1) montiert ist.
  7. Luftreinigungsgerät, das Folgendes umfasst:
    ein Gehäuse (1);
    einen Filter (14), der an einer Oberseite in dem Gehäuse (1) montiert ist; und
    ein Zentrifugalgebläse (3) nach einem der Ansprüche 1 bis 5, wobei das Zentrifugalgebläse (3) an der Oberseite in dem Gehäuse (1) montiert ist.
EP14878132.1A 2014-01-10 2014-01-10 Zentrifugalgebläse, klimaanlage und luftreinigungsvorrichtung Active EP3093500B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2014/050337 WO2015104838A1 (ja) 2014-01-10 2014-01-10 遠心ファン、空気調和装置及び空気清浄装置

Publications (3)

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EP3093500A1 EP3093500A1 (de) 2016-11-16
EP3093500A4 EP3093500A4 (de) 2017-12-20
EP3093500B1 true EP3093500B1 (de) 2022-03-23

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54168607U (de) * 1978-05-19 1979-11-28
JP3882324B2 (ja) * 1998-03-24 2007-02-14 ダイキン工業株式会社 遠心ファン
JP3758396B2 (ja) * 1999-01-11 2006-03-22 三菱電機株式会社 空気調和機
JP2000227231A (ja) * 1999-02-05 2000-08-15 Fujitsu General Ltd 天井埋込型空気調和機
AU2003284610B2 (en) * 2002-12-16 2006-11-16 Daikin Industries, Ltd. Centrifugal fan, and air conditioner provided therewith
JP4684085B2 (ja) * 2005-02-24 2011-05-18 三菱電機株式会社 天井埋込型空気調和機
JP5076324B2 (ja) * 2006-01-27 2012-11-21 ダイキン工業株式会社 遠心ファン
JP5131242B2 (ja) * 2009-04-22 2013-01-30 パナソニック株式会社 電動送風機及びそれを用いた電気掃除機

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JPWO2015104838A1 (ja) 2017-03-23
EP3093500A4 (de) 2017-12-20
EP3093500A1 (de) 2016-11-16
WO2015104838A1 (ja) 2015-07-16
JP6211101B2 (ja) 2017-10-11

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