EP4696896A1 - Blowing device and refrigeration device - Google Patents

Blowing device and refrigeration device

Info

Publication number
EP4696896A1
EP4696896A1 EP24831646.5A EP24831646A EP4696896A1 EP 4696896 A1 EP4696896 A1 EP 4696896A1 EP 24831646 A EP24831646 A EP 24831646A EP 4696896 A1 EP4696896 A1 EP 4696896A1
Authority
EP
European Patent Office
Prior art keywords
porous
blade
porous portion
blades
fixed guide
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.)
Pending
Application number
EP24831646.5A
Other languages
German (de)
French (fr)
Inventor
Yoshihide TSUJI
Hirotaka Tomioka
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of EP4696896A1 publication Critical patent/EP4696896A1/en
Pending legal-status Critical Current

Links

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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/50—Intrinsic material properties or characteristics
    • F05D2300/514—Porosity

Definitions

  • the present disclosure relates to a blowing apparatus and a refrigeration apparatus.
  • Patent Document 1 discloses an axial fan.
  • a blade (rotating blade) of an impeller is provided with a porous portion.
  • the axial fan generates less noise by the porous portion improving the flow of the air flowing around the rotating blade.
  • PATENT DOCUMENT 1 Japanese Unexamined Patent Publication No. H04-272499
  • a blowing apparatus that includes a rotary member (impeller) having a rotating blade and a fixed member having a stationary blade has been known.
  • the stationary blade is disposed downstream of the impeller as the rotary member, and the airflow generated by the impeller is guided by the stationary blade.
  • An object of the present disclosure is to provide a blowing apparatus that includes a rotary member having a rotating blade and a fixed member having a stationary blade, where the strength of the stationary blade is ensured while the noise is reduced by improving the air flow around the stationary blade.
  • a first aspect of the present disclosure is directed to a blowing apparatus (40) including: a rotary member (50) configured to rotate and having a plurality of rotating blades (52); and a fixed member (55) having a plurality of stationary blades (60) and disposed downstream of the rotary member (50), wherein the fixed member (55) has a first holding portion (56) connected to a blade root (64) of the stationary blade (60) and a second holding portion (57) connected to a blade tip (63) of the stationary blade (60), the plurality of stationary blades (60) of the fixed member (55) include a porous blade (70), part of which is a porous portion (71), the porous blade (70) includes a non-porous portion (72) continuous from the blade root (64) to the blade tip (63) of the porous blade (70).
  • the plurality of stationary blades (60) of the fixed member (55) include the porous blade (70). Some or all of the plurality of stationary blades (60) of the fixed member (55) are the porous blades (70). Part of the porous blade (70) is the porous portion (71). The air flow around the porous blade (70) is improved by the porous portion (71). As a result, the noise of the blowing apparatus (40) is reduced.
  • the porous blade (70) of the first aspect has the non-porous portion (72).
  • the non-porous portion (72) is continuous from the blade root (64) of the porous blade (70) that is connected to the first holding portion (56) to the blade tip (63) of the porous blade (70) that is connected to the second holding portion (57).
  • the non-porous portion (72) of which the strength is higher than that of the porous portion (71) is provided from the blade root (64) to the blade tip (63) of the porous blade (70), whereby the strength of the porous blade (70) is ensured.
  • a second aspect of the present disclosure is an embodiment of the first aspect.
  • one or both of a leading edge (61) and a trailing edge (62) of the porous blade (70) are formed by the non-porous portion (72).
  • the non-porous portion (72) forms one or both of the leading edge (61) and the trailing edge (62) of the porous blade (70).
  • a third aspect of the present disclosure is an embodiment of the first aspect.
  • the porous portion (71) of the porous blade (70) includes a plurality of porous portions (71), and the non-porous portion (72) is provided between the porous portions (71) adjacent to each other.
  • the non-porous portion (72) is provided between the porous portions (71) adjacent to each other.
  • a fourth aspect of the present disclosure is an embodiment of any one of the first to third aspects.
  • the porous portion (71) is provided from a pressure side surface (65) to a suction side surface (66) of the porous blade (70), and in the porous portion (71), a pore extending from the pressure side surface (65) to the suction side surface (66) of the porous blade (70) is formed.
  • the porous portion (71) is provided from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
  • the fluctuation in pressure generated by vortexes of the air flowing near the pressure side surface (65) is transmitted to the suction side surface (66) through the gaps of the porous portion (71).
  • the growth of the vortexes of the air flowing near the pressure side surface (65) is reduced.
  • a fifth aspect of the present disclosure is an embodiment of the first aspect.
  • the porous portion (71) is provided so as to cover a surface of the non-porous portion (72).
  • the surface of the non-porous portion (72) is covered by the porous portion (71).
  • a sixth aspect of the present disclosure is an embodiment of any one of the first to fifth aspects.
  • the plurality of stationary blades (60) provided on the fixed member (55) include a non-porous blade (75), an entire part of which is the non-porous portion (72).
  • the fixed member (55) is provided with both the porous blade (70) and the non-porous blade (75).
  • a seventh aspect of the present disclosure is directed to a refrigeration apparatus (10) including: the blowing apparatus (40) of any one of the first to sixth aspects, and a heat exchanger (23) configured to exchange heat between air supplied by the blowing apparatus (40) and a heat medium.
  • blowing apparatus (40) of any one of the first to sixth aspects is provided in the refrigeration apparatus (10).
  • the first embodiment will be described. This embodiment is directed to an air conditioner (10).
  • the air conditioner (10) is a refrigeration apparatus that performs a refrigeration cycle.
  • the air conditioner (10) includes an outdoor unit (11) and an indoor unit (12).
  • the outdoor unit (11) is installed outdoors.
  • the outdoor unit (11) has a compressor (21), a four-way switching valve (22), an outdoor heat exchanger (23), an expansion valve (24), a liquid-side shutoff valve (26), a gas-side shutoff valve (27), and an outdoor fan unit (40).
  • the compressor (21) is, for example, a hermetic scroll or hermetic rotary compressor.
  • the outdoor heat exchanger (23) is a heat exchanger that exchanges heat between refrigerant and outdoor air.
  • the outdoor heat exchanger (23) is, for example, a fin-and-tube air heat exchanger.
  • the expansion valve (24) is an electric expansion valve of which the opening degree is variable.
  • the four-way switching valve (22) is a valve for switching the flow path of the refrigerant in a refrigerant circuit (15).
  • the four-way switching valve (22) switches between a first state indicated by solid lines in FIG. 1 and a second state indicated by broken lines in FIG. 2 .
  • a first port communicates with a third port
  • a second port communicates with a fourth port.
  • the first port communicates with the fourth port
  • the second port communicates with the third port.
  • the indoor unit (12) is installed in an indoor space which is a target space to be air-conditioned.
  • the indoor unit (12) has an indoor heat exchanger (25) and an indoor fan (13).
  • the indoor heat exchanger (25) exchanges heat between refrigerant and indoor air.
  • the indoor heat exchanger (25) is a fin-and-tube air heat exchanger.
  • the outdoor unit (11) and the indoor unit (12) are connected to each other via a pair of connection pipes (16, 17).
  • the outdoor unit (11), the indoor unit (12), and the connection pipes (16, 17) form the refrigerant circuit (15) that performs a vapor compression refrigeration cycle.
  • a discharge pipe of the compressor (21) is connected to the first port of the four-way switching valve (22), and a suction pipe of the compressor (21) is connected to the second port of the four-way switching valve (22).
  • the outdoor heat exchanger (23) and the expansion valve (24) are disposed in sequence from the third port of the four-way switching valve (22) to the liquid-side shutoff valve (26).
  • the fourth port of the four-way switching valve (22) is connected with the gas-side shutoff valve (27).
  • the liquid-side shutoff valve (26) is connected to the liquid-side end of the indoor heat exchanger (25) via the liquid-side connection pipe (16).
  • the gas-side shutoff valve (27) is connected to the gas-side end of the indoor heat exchanger (25) via the gas-side connection pipe (17).
  • the air conditioner (10) performs a cooling operation and a heating operation.
  • the four-way switching valve (22) is set to the first state, and the refrigerant circulates in the refrigerant circuit (15).
  • the outdoor heat exchanger (23) functions as a condenser
  • the indoor heat exchanger (25) functions as an evaporator.
  • the indoor unit (12) cools the air sucked from the indoor space in the indoor heat exchanger (25), and discharges the cooled air into the indoor space.
  • the four-way switching valve (22) is set to the second state, and the refrigerant circulates in the refrigerant circuit (15).
  • the indoor heat exchanger (25) functions as a condenser
  • the outdoor heat exchanger (23) functions as an evaporator.
  • the indoor unit (12) heats the air sucked from the indoor space in the indoor heat exchanger (25), and discharges the heated air into the indoor space.
  • the outdoor unit (11) includes a casing (30) having a rectangular parallelepiped shape.
  • the casing (30) has a back surface and a left surface each provided with an inlet port (31) and a front surface provided with an outlet port (32).
  • the front surface of the casing (30) is provided with an outlet grille (33).
  • the outlet grille (33) covers the outlet port (32).
  • a partition plate (34) is provided in the internal space of the casing (30).
  • the partition plate (34) partitions the internal space of the casing (30) into an equipment chamber (36) on the right and a remaining air passage (35).
  • the equipment chamber (36) houses the compressor (21) and the like.
  • the air passage (35) communicates with the inlet ports (31) and the outlet port (32).
  • the outdoor heat exchanger (23) and the outdoor fan unit (40) are housed in the air passage (35).
  • the outdoor heat exchanger (23) is formed in an L shape in plan view.
  • the outdoor heat exchanger (23) is provided along the back surface and the left surface of the casing (30), and faces the inlet ports (31).
  • the outdoor fan unit (40) is provided downstream of the outdoor heat exchanger (23) in the air passage (35).
  • the outdoor fan unit (40) includes an impeller (50), an electric motor (41), and a fixed guide (55).
  • the outdoor fan unit (40) is a blowing apparatus that includes the impeller (50) as a rotary member and the fixed guide (55) as a fixed member.
  • the electric motor (41) is coupled to the impeller (50) and rotationally drives the impeller (50).
  • the electric motor (41) is fixed to the outdoor heat exchanger (23) via a support (37).
  • the fixed guide (55) is disposed downstream of the impeller (50).
  • the fixed guide (55) is provided so as to face the outlet port (32) of the casing (30).
  • the fixed guide (55) is fixed to the casing (30) or the outlet grille (33).
  • the impeller (50) includes one hub (51) and three rotating blades (52).
  • the impeller (50) is a propeller fan.
  • the impeller (50) is a rotary member that is rotationally driven by the electric motor (41).
  • the number of rotating blades (52) on the impeller (50) is merely an example.
  • the hub (51) is a cylindrical portion of which the front end portion is closed.
  • the hub (51) is coupled to an output shaft of the electric motor (41).
  • the hub (51) is disposed coaxially with the output shaft of the electric motor (41).
  • Each of the rotating blades (52) protrudes from the outer peripheral surface of the hub (51), and extends outward in the radial direction of the hub (51).
  • the rotating blades (52) are disposed at regular angular intervals in the circumferential direction of the hub (51).
  • the impeller (50) is a resin member formed by injection molding.
  • the one hub (51) is integrated with the three rotating blades (52).
  • Each of the hub (51) and the rotating blades (52) is made of a non-porous resin.
  • the fixed guide (55) includes one hub (56), eleven stationary blades (60), and one outer peripheral ring (57).
  • the hub (56) is a cylindrical portion of which both of the end portions are closed.
  • the hub (56) is disposed substantially coaxially with the hub (51) of the impeller (50).
  • the outer diameter of the hub (56) is substantially equal to the outer diameter of the hub (51) of the impeller (50).
  • the material of the hub (56) is a non-porous resin.
  • the hub (56) is connected with the blade roots (64) of all the stationary blades (60).
  • the hub (56) is a first holding portion connected to the blade roots (64) of the stationary blades (60).
  • the outer peripheral ring (57) is a ring-shaped or short-cylinder-shaped portion.
  • the outer peripheral ring (57) is disposed substantially coaxially with the hub (56).
  • the inner diameter of the outer peripheral ring (57) is larger than the outer diameter of the impeller (50).
  • the material of the outer peripheral ring (57) is a non-porous resin.
  • the outer peripheral ring (57) is connected to blade tips (63) of all the stationary blades (60).
  • the outer peripheral ring (57) is a second holding portion connected to the blade tips (63) of the stationary blades (60).
  • Each of the stationary blades (60) protrudes from the outer peripheral surface of the hub (56), and extends outward in the radial direction of the hub (56).
  • Each of the stationary blades (60) is provided from the hub (56) to the outer peripheral ring (57).
  • the blade root (64) is fixed to the hub (56), and the blade tip (63) is fixed to the outer peripheral ring (57).
  • the stationary blades (60) are disposed at regular angular intervals in the circumferential direction of the hub (56).
  • each of the stationary blades (60) includes one porous portion (71) and one non-porous portion (72).
  • Each of the stationary blades (60) is a porous blade (70), part of which is the porous portion (71).
  • all the stationary blades (60) are the porous blades (70).
  • the non-porous portion (72) is formed in a frame shape along the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70).
  • the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70) of this embodiment are formed by the non-porous portion (72).
  • the non-porous portion (72) is a portion in which substantially no pores are formed.
  • the non-porous portion (72) of this embodiment is a solid portion made of a resin.
  • the porous portion (71) is provided inside the non-porous portion (72) that is formed in a frame shape.
  • the porous portion (71) of this embodiment is surrounded by the non-porous portion (72) that is formed in a frame shape.
  • a large number of pores are formed in the porous portion (71) that forms the porous blade (70).
  • the average diameter of the pores of the porous portion (71) is, for example, 140 ⁇ m.
  • the average diameter of the pores of the porous portion (71) is, for example, 15 ⁇ m or more and 300 ⁇ m or less in one preferred embodiment.
  • the porosity of the porous portion (71) is, for example, 35% or more and 90% or less in one preferred embodiment.
  • the right end is the leading edge (61)
  • the left end is the trailing edge (62)
  • the upper surface is a pressure side surface (65)
  • the lower surface is a suction side surface (66).
  • the portion between "the non-porous portion (72) along the leading edge (61)" and “the non-porous portion (72) along the trailing edge (62)” is the porous portion (71).
  • the porous portion (71) that forms the porous blade (70) extends from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
  • the pores formed in the porous portion (71) are continuous from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
  • the porous portion (71) that forms the porous blade (70) is formed by loading fine resin pellets into a mold and then heating these pellets. When the resin pellets in the mold are heated, the resin pellets adjacent to each other are welded to each other at a contact portion so that the resin pellets in the mold are joined to each other. In this manner, the porous portion (71) made of a resin and having a large number of fine pores is formed.
  • the fixed guide (55) is formed by so-called insert molding. Specifically, the eleven stationary blades (60) are disposed in predetermined positions in the mold, and a resin is loaded into the mold, so that the hub (56) and the outer peripheral ring (57) are formed while the hub (56) and the outer peripheral ring (57) are joined to each of the stationary blades (60).
  • each of part of the porous blade (70) that is along the leading edge (61) and part of the porous blade (70) that is along the trailing edge (62) is formed by the non-porous portion (72) that is continuous from the blade root (64) to the blade tip (63).
  • the non-porous portion (72) is provided from the blade root (64) to the blade tip (63); one end of the non-porous portion (72) is joined to the hub (56); and the other end of the non-porous portion (72) is joined to the outer peripheral ring (57).
  • the impeller (50) is driven by the electric motor (41) and rotates in the arrow direction in FIG. 4 (the counterclockwise direction when viewed from the front).
  • the impeller (50) rotates in this direction to suck the air having passed through the outdoor heat exchanger (23) and discharge the sucked air toward the fixed guide (55).
  • the flow of the air discharged from the impeller (50) turns in the rotation direction of the impeller (50).
  • the flow of the turning air is guided by the stationary blades (60) of the fixed guide (55), and its direction is changed to the forward direction of the fixed guide (55) (in other words, the direction toward the outlet port of the casing (30)).
  • the air having passed through the fixed guide (55) is discharged outside the casing (30) through the outlet port (32).
  • the starting point of the flow separation of the air flowing along the pressure side surface (65) of the stationary blade (60) is located in the intermediate region between the leading edge (61) and the trailing edge (62).
  • the pressure fluctuates near the pressure side surface (65) so that the pressure locally increases.
  • the porous blades (70) are the porous blades (70).
  • the porous portion (71) is disposed in the intermediate region between the leading edge (61) and the trailing edge (62).
  • the pores extending from the pressure side surface (65) to the suction side surface (66) of the porous blade (70) are formed.
  • the pressure having locally increased near the pressure side surface (65) of the porous blade (70) is released toward the suction side surface (66) of the stationary blade (60) through the pores of the porous portion (71).
  • the pressure fluctuation near the pressure side surface (65) of the stationary blade (60) is reduced; the growth of the vortex near the pressure side surface (65) is reduced; and the noise due to the vortex near the pressure side surface (65) is reduced.
  • each of the porous blades (70) includes one porous portion (71) and one non-porous portion (72).
  • the non-porous portion (72) of this embodiment is formed in a frame shape along the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70).
  • the non-porous portion (72) with higher strength than the porous portion (71) is disposed along the peripheral edge of the porous blade (70).
  • the non-porous portion (72) is provided from the blade root (64) to the blade tip (63); one end of the non-porous portion (72) is joined to the hub (56); and the other end of the non-porous portion (72) is joined to the outer peripheral ring (57).
  • the non-porous portion (72) with higher strength than the porous portion (71) is provided from the blade root (64) to the blade tip (63), and is joined to the hub (56) and the outer peripheral ring (57). Accordingly, according to this embodiment, the strength of the porous blade (70) can be ensured, and as a result, the strength of the entire part of the fixed guide (55) can be ensured.
  • the starting point of the flow separation of the air flowing along the pressure side surface (65) of the stationary blade (60) is located in the intermediate region between the leading edge (61) and the trailing edge (62).
  • the porous portion (71) is disposed in the intermediate region between the leading edge (61) and the trailing edge (62).
  • part of the pressure side surface (65) of the porous blade (70) in which the starting point of the flow separation is located can be formed by the porous portion (71).
  • part of the porous blade (70) that is along the peripheral edge of the porous blade (70) is formed by the non-porous portion (72), whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71).
  • the noise generated by the operation of the outdoor fan unit (40) can be reduced.
  • the porous portion (71) may be provided in only part of the porous blade (70) that is close to the leading edge.
  • the porous portion (71) is provided between the center line (C) of the porous blade (70) in the width direction and the leading edge (61).
  • the center line (C) of the porous blade (70) in the width direction is the line that connects the midpoints of the chord lines (67) in the cross sections from the blade root (64) to the blade tip (63).
  • the starting point of the flow separation of the air flowing along the pressure side surface (65) of the stationary blade (60) is located in the intermediate region between the leading edge (61) and the center line (C) in many cases.
  • part of the pressure side surface (65) of the porous blade (70) in which the starting point of the flow separation is located can be formed by the porous portion (71).
  • the non-porous portion (72) is provided, whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71).
  • the noise generated by the operation of the outdoor fan unit (40) can be reduced.
  • the air conditioner (10) of this embodiment is a modified version of the air conditioner (10) of the first embodiment where the fixed guide (55) of the outdoor fan unit (40) is modified.
  • the following description will focus on the difference between the fixed guide (55) of this embodiment and the fixed guide (55) of the first embodiment.
  • each of the porous blades (70) includes one porous portion (71) and one non-porous portion (72) similarly to the porous blade (70) of the first embodiment.
  • the porous blade (70) of this embodiment about half of the porous blade (70) in the width direction that is close to the leading edge (61) is the porous portion (71), and the remaining about half of the porous blade (70) that is close to the trailing edge (62) is the non-porous portion (72).
  • each of the porous portion (71) and the non-porous portion (72) extends from the blade root (64) to the blade tip (63) of the porous blade (70).
  • One end of each of the porous portion (71) and the non-porous portion (72) is joined to the hub (56), and the other end of the same is joined to the outer peripheral ring (57).
  • the configurations of the porous portion (71) and the non-porous portion (72) are the same as the configurations of the porous portion (71) and the non-porous portion (72) of the first embodiment, respectively.
  • the porous portion (71) extends from the pressure side surface (65) to the suction side surface (66) of the porous blade (70). Further, the pores formed in the porous portion (71) are continuous from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
  • all the stationary blades (60) are the porous blades (70).
  • the non-porous portion (72) is provided from the blade root (64) to the blade tip (63) of the porous blade (70).
  • the entire part of the porous blade (70) that is along the trailing edge (62) is formed by the non-porous portion (72) of which the strength is higher than that of the porous portion (71), whereby the strength of the porous blade (70) can be ensured.
  • the starting point of the flow separation of the air flowing along the pressure side surface (65) of the stationary blade (60) is located in the intermediate region between the leading edge (61) and the center line (C) in many cases.
  • the porous blade (70) of this embodiment about half of the porous blade (70) in the width direction that is close to the leading edge (61) is the porous portion (71).
  • part of the pressure side surface (65) of the porous blade (70) in which the starting point of the flow separation is located can be formed by the porous portion (71) similarly to the first embodiment.
  • the non-porous portion (72) is provided, whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
  • the porous blade (70) of this embodiment about half of the porous blade (70) in the width direction that is close to the leading edge (61) may be the non-porous portion (72), and the remaining about half of the porous blade (70) that is close to the trailing edge (62) may be the porous portion (71).
  • the air conditioner (10) of this embodiment is a modified version of the air conditioner (10) of the first embodiment where the fixed guide (55) of the outdoor fan unit (40) is modified.
  • the following description will focus on the difference between the fixed guide (55) of this embodiment and the fixed guide (55) of the first embodiment.
  • each of the porous blades (70) includes one porous portion (71) and one non-porous portion (72) similarly to the porous blade (70) of the first embodiment.
  • the porous blade (70) of this embodiment part of the porous blade (70) that is close to the blade tip (63) and that includes a corner on the leading edge side is the porous portion (71), and the remaining part of the porous blade (70) that is close to the blade root (64) is the non-porous portion (72).
  • the non-porous portion (72) is continuous from the blade root (64) to the blade tip (63) of the porous blade (70).
  • the configurations of the porous portion (71) and the non-porous portion (72) are the same as the configurations of the porous portion (71) and the non-porous portion (72) of the first embodiment, respectively.
  • the porous portion (71) extends from the pressure side surface (65) to the suction side surface (66) of the porous blade (70). Further, the pores formed in the porous portion (71) are continuous from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
  • all the stationary blades (60) are the porous blades (70).
  • part of the porous blade (70) that extends from the blade root (64) to the blade tip (63) is formed by the non-porous portion (72) of which the strength is higher than that of the porous portion (71).
  • the strength of the porous blade (70) can be ensured.
  • the flow velocity of the air sent from the impeller (50) is higher in the outer peripheral side of the impeller (50).
  • the air discharged from near the outer periphery of the impeller (50) and flowing at a relatively high velocity flows into part of the stationary blade (60) that is close to the blade tip (63).
  • the flow separation is more likely to occur on part of the stationary blade (60) that is close to the blade tip (63) than part of the stationary blade (60) that is close to the blade root (64).
  • the porous portion (71) part of the porous blade (70) that is close to the blade tip (63) is formed by the porous portion (71).
  • the non-porous portion (72) is provided, whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71).
  • the noise generated by the operation of the outdoor fan unit (40) can be reduced.
  • the air conditioner (10) of this embodiment is a modified version of the air conditioner (10) of the first embodiment where the fixed guide (55) of the outdoor fan unit (40) is modified.
  • the following description will focus on the difference between the fixed guide (55) of this embodiment and the fixed guide (55) of the first embodiment.
  • each of the porous blades (70) includes a plurality of porous portions (71) (six porous portions (71) in this embodiment) and one non-porous portion (72).
  • the non-porous portion (72) is formed in a grid shape.
  • the plurality of porous portions (71) are fitted into the non-porous portion (72) in a grid shape.
  • the plurality of porous portions (71) are arranged in the direction from the leading edge (61) to the trailing edge (62) of the porous blade (70) and in the direction from the blade root (64) to the blade tip (63) of the porous blade (70).
  • each of the porous blades (70) the plurality of porous portions (71) are disposed apart from each other, and the non-porous portion (72) is provided between the porous portions (71) adjacent to each other. Further, similarly to the first embodiment, in each of the porous blades (70), each of part of the porous blade (70) that is along the leading edge (61) and part of the porous blade (70) that is along the trailing edge (62) is formed by the non-porous portion (72) that is continuous from the blade root (64) to the blade tip (63).
  • each of the porous portions (71) extends from the pressure side surface (65) to the suction side surface (66) of the porous blade (70). Further, the pores formed in each of the porous portions (71) are continuous from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
  • all the stationary blades (60) are the porous blades (70).
  • Each of the porous blades (70) is provided with the non-porous portion (72) formed in a grid shape, and the plurality of porous portions (71) are fitted into the non-porous portion (72) formed in a grid shape.
  • the non-porous portion (72) of which the strength is higher than that of the porous portion (71) is formed in a grid shape, whereby the strength of the porous blade (70) can be ensured.
  • the plurality of porous portions (71) are fitted into the non-porous portion (72) formed in a grid shape, the plurality of porous portions (71) are reliably held by the non-porous portion (72).
  • porous blade (70) of this embodiment as well, part of the pressure side surface (65) of the porous blade (70) in which the starting point of the flow separation is located can be formed by the porous portion (71). Accordingly, according to this embodiment, the non-porous portion (72) is provided, whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
  • the air conditioner (10) of this embodiment is a modified version of the air conditioner (10) of the first embodiment where the fixed guide (55) of the outdoor fan unit (40) is modified.
  • the following description will focus on the difference between the fixed guide (55) of this embodiment and the fixed guide (55) of the first embodiment.
  • each of the porous blades (70) includes one porous portion (71) and one non-porous portion (72) similarly to the porous blade (70) of the first embodiment.
  • a large part of the porous blade (70) of this embodiment is the non-porous portion (72).
  • the non-porous portion (72) of this embodiment extends from the blade root (64) to the blade tip (63) of the porous blade (70) while extending from the leading edge (61) to the trailing edge (62) of the porous blade (70).
  • the porous portion (71) of this embodiment is formed in a thin plate shape, and covers the upper surface of the non-porous portion (72) in FIG. 13 .
  • the entire part of the pressure side surface (65) is formed by the porous portion (71), and the entire part of the suction side surface (66) is formed by the non-porous portion (72).
  • the configurations of the porous portion (71) and the non-porous portion (72) are the same as the configurations of the porous portion (71) and the non-porous portion (72) of the first embodiment, respectively.
  • the porous portion (71) of this embodiment only forms the pressure side surface (65) of the porous blade (70), and does not form the suction side surface (66) of the porous blade (70).
  • all the stationary blades (60) are the porous blades (70).
  • the pressure side surface (65) of the porous blade (70) is formed by the porous portion (71).
  • the fluctuation in pressure due to the vortex generated near the pressure side surface (65) of the porous blade (70) is reduced by the effect of the pores of the porous portion (71) that forms the pressure side surface (65). Accordingly, according to this embodiment, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
  • the porous portion (71) may be provided so as to cover the lower surface of the non-porous portion (72) in FIG. 14 .
  • the entire part of the pressure side surface (65) is formed by the non-porous portion (72), and the entire part of the suction side surface (66) is formed by the porous portion (71).
  • the porous portion (71) may be provided so as to cover the entire surface of the non-porous portion (72). In the porous blade (70) of this variation, both the pressure side surface (65) and the suction side surface (66) are formed by the porous portion (71).
  • the stationary blades (60) that form the fixed guide (55) may include both the porous blade (70) and the non-porous blade (75).
  • some of the plurality of stationary blades (60) that form the fixed guide (55) are the porous blades (70), and the rest are the non-porous blades (75).
  • the non-porous blade (75) is the stationary blade (60), the entire part of which is formed by the non-porous portion (72).
  • FIG. 15 shows the fixed guide (55) of the first embodiment to which this variation is applied.
  • part or the entire part of the rotating blade (52) that forms the impeller (50) may be the porous portion (71).
  • blowing apparatus is used as the outdoor fan unit (40) of the air conditioner (10)
  • the blowing apparatus is not limited to being used as the outdoor fan unit (40).
  • the blowing apparatus may be used as an indoor fan unit provided in an indoor unit of an air conditioner, an internal fan unit provided in a container refrigeration apparatus, and the like.
  • the stationary blade (60) of the fixed guide (55) may be provided with a plurality of small-diameter holes (100) instead of the porous portion (71).
  • FIG. 16 shows the stationary blade (60) of the first embodiment to which this reference example is applied.
  • Each of the small-diameter holes (100) is a through hole that runs through the stationary blade (60) in the thickness direction.
  • One end of the small-diameter hole (100) is open in the pressure side surface (65) of the stationary blade (60), and the other end is open in the suction side surface (66) of the stationary blade (60).
  • the diameter of the small-diameter hole (100) is, for example, 0.3 mm or less.
  • the present disclosure is useful for a blowing apparatus and a refrigeration apparatus.

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Abstract

An outdoor fan unit as a blowing apparatus includes an impeller as a rotary member and a fixed guide (55) as a fixed member. The impeller has a plurality of rotating blades. The fixed guide (55) has a plurality of stationary blades (60), and is disposed downstream of the impeller. The plurality of stationary blades (60) of the fixed guide (55) include a porous blade (70), part of which is a porous portion (71). The porous blade (70) includes a non-porous portion (72) continuous from a blade root (64) to a blade tip (63) of the porous blade (70).

Description

    TECHNICAL FIELD
  • The present disclosure relates to a blowing apparatus and a refrigeration apparatus.
    • BACKGROUND ART
  • Patent Document 1 discloses an axial fan. In this axial fan, a blade (rotating blade) of an impeller is provided with a porous portion. The axial fan generates less noise by the porous portion improving the flow of the air flowing around the rotating blade.
    • CITATION LIST PATENT DOCUMENT
  • PATENT DOCUMENT 1: Japanese Unexamined Patent Publication No. H04-272499
    • SUMMARY OF THE INVENTION TECHNICAL PROBLEM
  • A blowing apparatus that includes a rotary member (impeller) having a rotating blade and a fixed member having a stationary blade has been known. In this blowing apparatus, the stationary blade is disposed downstream of the impeller as the rotary member, and the airflow generated by the impeller is guided by the stationary blade.
  • However, although using the porous portion in order to improve the airflow around the rotating blade has been examined, using the porous portion in order to improve the airflow around the stationary blade has not been fully examined. Further, the structure to ensure the strength of the stationary blade provided with the porous portion has not been fully examined.
  • An object of the present disclosure is to provide a blowing apparatus that includes a rotary member having a rotating blade and a fixed member having a stationary blade, where the strength of the stationary blade is ensured while the noise is reduced by improving the air flow around the stationary blade.
    • SOLUTION TO THE PROBLEM
  • A first aspect of the present disclosure is directed to a blowing apparatus (40) including: a rotary member (50) configured to rotate and having a plurality of rotating blades (52); and a fixed member (55) having a plurality of stationary blades (60) and disposed downstream of the rotary member (50), wherein the fixed member (55) has a first holding portion (56) connected to a blade root (64) of the stationary blade (60) and a second holding portion (57) connected to a blade tip (63) of the stationary blade (60), the plurality of stationary blades (60) of the fixed member (55) include a porous blade (70), part of which is a porous portion (71), the porous blade (70) includes a non-porous portion (72) continuous from the blade root (64) to the blade tip (63) of the porous blade (70).
  • In the first aspect, the plurality of stationary blades (60) of the fixed member (55) include the porous blade (70). Some or all of the plurality of stationary blades (60) of the fixed member (55) are the porous blades (70). Part of the porous blade (70) is the porous portion (71). The air flow around the porous blade (70) is improved by the porous portion (71). As a result, the noise of the blowing apparatus (40) is reduced.
  • The porous blade (70) of the first aspect has the non-porous portion (72). The non-porous portion (72) is continuous from the blade root (64) of the porous blade (70) that is connected to the first holding portion (56) to the blade tip (63) of the porous blade (70) that is connected to the second holding portion (57). Thus, the non-porous portion (72) of which the strength is higher than that of the porous portion (71) is provided from the blade root (64) to the blade tip (63) of the porous blade (70), whereby the strength of the porous blade (70) is ensured.
  • A second aspect of the present disclosure is an embodiment of the first aspect. In the second aspect, one or both of a leading edge (61) and a trailing edge (62) of the porous blade (70) are formed by the non-porous portion (72).
  • In the porous blade (70) of the second aspect, the non-porous portion (72) forms one or both of the leading edge (61) and the trailing edge (62) of the porous blade (70).
  • A third aspect of the present disclosure is an embodiment of the first aspect. In the third aspect, the porous portion (71) of the porous blade (70) includes a plurality of porous portions (71), and the non-porous portion (72) is provided between the porous portions (71) adjacent to each other.
  • In the porous blade (70) of the third aspect, the non-porous portion (72) is provided between the porous portions (71) adjacent to each other.
  • A fourth aspect of the present disclosure is an embodiment of any one of the first to third aspects. In the fourth aspect, the porous portion (71) is provided from a pressure side surface (65) to a suction side surface (66) of the porous blade (70), and in the porous portion (71), a pore extending from the pressure side surface (65) to the suction side surface (66) of the porous blade (70) is formed.
  • In the porous blade (70) of the fourth aspect, the porous portion (71) is provided from the pressure side surface (65) to the suction side surface (66) of the porous blade (70). The fluctuation in pressure generated by vortexes of the air flowing near the pressure side surface (65) is transmitted to the suction side surface (66) through the gaps of the porous portion (71). Thus, the growth of the vortexes of the air flowing near the pressure side surface (65) is reduced.
  • A fifth aspect of the present disclosure is an embodiment of the first aspect. In the fifth aspect, the porous portion (71) is provided so as to cover a surface of the non-porous portion (72).
  • In the porous blade (70) of the fifth aspect, the surface of the non-porous portion (72) is covered by the porous portion (71).
  • A sixth aspect of the present disclosure is an embodiment of any one of the first to fifth aspects. In the sixth aspect, the plurality of stationary blades (60) provided on the fixed member (55) include a non-porous blade (75), an entire part of which is the non-porous portion (72).
  • In the sixth aspect, the fixed member (55) is provided with both the porous blade (70) and the non-porous blade (75).
  • A seventh aspect of the present disclosure is directed to a refrigeration apparatus (10) including: the blowing apparatus (40) of any one of the first to sixth aspects, and a heat exchanger (23) configured to exchange heat between air supplied by the blowing apparatus (40) and a heat medium.
  • In the seventh aspect, the blowing apparatus (40) of any one of the first to sixth aspects is provided in the refrigeration apparatus (10).
    • BRIEF DESCRIPTION OF THE DRAWINGS
    • [FIG. 1] FIG. 1 is a piping system diagram showing a refrigerant circuit of an air conditioner of a first embodiment.
    • [FIG. 2] FIG. 2 is a plan view of an outdoor unit of the first embodiment, where a top panel of a casing is omitted.
    • [FIG. 3] FIG. 3 is a perspective view of an impeller and a fixed guide that form an outdoor fan unit of the first embodiment, where the impeller and the fixed guide are combined.
    • [FIG. 4] FIG. 4 is a perspective view of the impeller of the outdoor fan unit of the first embodiment.
    • [FIG. 5] FIG. 5 is a perspective view of the fixed guide of the outdoor fan unit of the first embodiment.
    • [FIG. 6] FIG. 6 is an enlarged perspective view of part of the fixed guide of the first embodiment.
    • [FIG. 7] FIG. 7 is a sectional view of a stationary blade (porous blade) taken along line VII-VII in FIG. 6.
    • [FIG. 8] FIG. 8 is a sectional view of a stationary blade (porous blade) of a variation of the first embodiment, and corresponds to FIG. 7.
    • [FIG. 9] FIG. 9 is an enlarged perspective view of part of a fixed guide of a second embodiment.
    • [FIG. 10] FIG. 10 is an enlarged perspective view of part of a fixed guide of a variation of the second embodiment.
    • [FIG. 11] FIG. 11 is an enlarged perspective view of part of a fixed guide of a third embodiment.
    • [FIG. 12] FIG. 12 is an enlarged perspective view of part of a fixed guide of a fourth embodiment.
    • [FIG. 13] FIG. 13 is a sectional view of a stationary blade (porous blade) of a fifth embodiment, and corresponds to FIG. 7.
    • [FIG. 14] FIG. 14 is a sectional view of a stationary blade (porous blade) of a variation of the fifth embodiment, and corresponds to FIG. 7.
    • [FIG. 15] FIG. 15 is a perspective view of a fixed guide of a first variation as another embodiment.
    • [FIG. 16] FIG. 16 is a sectional view of a stationary blade of a reference example, and corresponds to FIG. 7.
    DESCRIPTION OF EMBODIMENTS <<First Embodiment>>
  • The first embodiment will be described. This embodiment is directed to an air conditioner (10). The air conditioner (10) is a refrigeration apparatus that performs a refrigeration cycle.
    • -Air Conditioner-
  • As shown in FIG. 1, the air conditioner (10) includes an outdoor unit (11) and an indoor unit (12).
    • <Outdoor Unit>
  • The outdoor unit (11) is installed outdoors. The outdoor unit (11) has a compressor (21), a four-way switching valve (22), an outdoor heat exchanger (23), an expansion valve (24), a liquid-side shutoff valve (26), a gas-side shutoff valve (27), and an outdoor fan unit (40).
  • The compressor (21) is, for example, a hermetic scroll or hermetic rotary compressor. The outdoor heat exchanger (23) is a heat exchanger that exchanges heat between refrigerant and outdoor air. The outdoor heat exchanger (23) is, for example, a fin-and-tube air heat exchanger. The expansion valve (24) is an electric expansion valve of which the opening degree is variable.
  • The four-way switching valve (22) is a valve for switching the flow path of the refrigerant in a refrigerant circuit (15). The four-way switching valve (22) switches between a first state indicated by solid lines in FIG. 1 and a second state indicated by broken lines in FIG. 2. In the first state, a first port communicates with a third port, and a second port communicates with a fourth port. In the second state, the first port communicates with the fourth port, and the second port communicates with the third port.
    • <Indoor Unit>
  • The indoor unit (12) is installed in an indoor space which is a target space to be air-conditioned. The indoor unit (12) has an indoor heat exchanger (25) and an indoor fan (13). The indoor heat exchanger (25) exchanges heat between refrigerant and indoor air. The indoor heat exchanger (25) is a fin-and-tube air heat exchanger.
    • <Refrigerant Circuit>
  • In the air conditioner (10), the outdoor unit (11) and the indoor unit (12) are connected to each other via a pair of connection pipes (16, 17). In the air conditioner (10), the outdoor unit (11), the indoor unit (12), and the connection pipes (16, 17) form the refrigerant circuit (15) that performs a vapor compression refrigeration cycle.
  • In the refrigerant circuit (15), a discharge pipe of the compressor (21) is connected to the first port of the four-way switching valve (22), and a suction pipe of the compressor (21) is connected to the second port of the four-way switching valve (22). In the refrigerant circuit (15), the outdoor heat exchanger (23) and the expansion valve (24) are disposed in sequence from the third port of the four-way switching valve (22) to the liquid-side shutoff valve (26). The fourth port of the four-way switching valve (22) is connected with the gas-side shutoff valve (27). The liquid-side shutoff valve (26) is connected to the liquid-side end of the indoor heat exchanger (25) via the liquid-side connection pipe (16). The gas-side shutoff valve (27) is connected to the gas-side end of the indoor heat exchanger (25) via the gas-side connection pipe (17).
    • -Operation of Air Conditioner-
  • The air conditioner (10) performs a cooling operation and a heating operation.
    • <Cooling Operation>
  • In the cooling operation, the four-way switching valve (22) is set to the first state, and the refrigerant circulates in the refrigerant circuit (15). In the refrigerant circuit (15), the outdoor heat exchanger (23) functions as a condenser, and the indoor heat exchanger (25) functions as an evaporator. The indoor unit (12) cools the air sucked from the indoor space in the indoor heat exchanger (25), and discharges the cooled air into the indoor space.
    • <Heating Operation>
  • In the heating operation, the four-way switching valve (22) is set to the second state, and the refrigerant circulates in the refrigerant circuit (15). In the refrigerant circuit (15), the indoor heat exchanger (25) functions as a condenser, and the outdoor heat exchanger (23) functions as an evaporator. The indoor unit (12) heats the air sucked from the indoor space in the indoor heat exchanger (25), and discharges the heated air into the indoor space.
    • -Structure of Outdoor Unit-
  • As shown in FIG. 2, the outdoor unit (11) includes a casing (30) having a rectangular parallelepiped shape. The casing (30) has a back surface and a left surface each provided with an inlet port (31) and a front surface provided with an outlet port (32). The front surface of the casing (30) is provided with an outlet grille (33). The outlet grille (33) covers the outlet port (32).
  • A partition plate (34) is provided in the internal space of the casing (30). The partition plate (34) partitions the internal space of the casing (30) into an equipment chamber (36) on the right and a remaining air passage (35). The equipment chamber (36) houses the compressor (21) and the like. The air passage (35) communicates with the inlet ports (31) and the outlet port (32). The outdoor heat exchanger (23) and the outdoor fan unit (40) are housed in the air passage (35).
  • The outdoor heat exchanger (23) is formed in an L shape in plan view. The outdoor heat exchanger (23) is provided along the back surface and the left surface of the casing (30), and faces the inlet ports (31). The outdoor fan unit (40) is provided downstream of the outdoor heat exchanger (23) in the air passage (35).
    • -Configuration of Outdoor Fan Unit-
  • As shown in FIG. 2, the outdoor fan unit (40) includes an impeller (50), an electric motor (41), and a fixed guide (55). The outdoor fan unit (40) is a blowing apparatus that includes the impeller (50) as a rotary member and the fixed guide (55) as a fixed member.
  • The electric motor (41) is coupled to the impeller (50) and rotationally drives the impeller (50). The electric motor (41) is fixed to the outdoor heat exchanger (23) via a support (37). The fixed guide (55) is disposed downstream of the impeller (50). The fixed guide (55) is provided so as to face the outlet port (32) of the casing (30). The fixed guide (55) is fixed to the casing (30) or the outlet grille (33).
    • <Impeller>
  • As shown in FIGS. 3 and 4, the impeller (50) includes one hub (51) and three rotating blades (52). The impeller (50) is a propeller fan. The impeller (50) is a rotary member that is rotationally driven by the electric motor (41). The number of rotating blades (52) on the impeller (50) is merely an example.
  • The hub (51) is a cylindrical portion of which the front end portion is closed. The hub (51) is coupled to an output shaft of the electric motor (41). The hub (51) is disposed coaxially with the output shaft of the electric motor (41).
  • Each of the rotating blades (52) protrudes from the outer peripheral surface of the hub (51), and extends outward in the radial direction of the hub (51). The rotating blades (52) are disposed at regular angular intervals in the circumferential direction of the hub (51).
  • The impeller (50) is a resin member formed by injection molding. In the impeller (50), the one hub (51) is integrated with the three rotating blades (52). Each of the hub (51) and the rotating blades (52) is made of a non-porous resin.
    • <Fixed Guide>
  • As shown in FIGS. 3 and 5, the fixed guide (55) includes one hub (56), eleven stationary blades (60), and one outer peripheral ring (57).
  • The hub (56) is a cylindrical portion of which both of the end portions are closed. The hub (56) is disposed substantially coaxially with the hub (51) of the impeller (50). The outer diameter of the hub (56) is substantially equal to the outer diameter of the hub (51) of the impeller (50). The material of the hub (56) is a non-porous resin. The hub (56) is connected with the blade roots (64) of all the stationary blades (60). The hub (56) is a first holding portion connected to the blade roots (64) of the stationary blades (60).
  • The outer peripheral ring (57) is a ring-shaped or short-cylinder-shaped portion. The outer peripheral ring (57) is disposed substantially coaxially with the hub (56). The inner diameter of the outer peripheral ring (57) is larger than the outer diameter of the impeller (50). The material of the outer peripheral ring (57) is a non-porous resin. The outer peripheral ring (57) is connected to blade tips (63) of all the stationary blades (60). The outer peripheral ring (57) is a second holding portion connected to the blade tips (63) of the stationary blades (60).
  • Each of the stationary blades (60) protrudes from the outer peripheral surface of the hub (56), and extends outward in the radial direction of the hub (56). Each of the stationary blades (60) is provided from the hub (56) to the outer peripheral ring (57). In each of the stationary blades (60), the blade root (64) is fixed to the hub (56), and the blade tip (63) is fixed to the outer peripheral ring (57). The stationary blades (60) are disposed at regular angular intervals in the circumferential direction of the hub (56).
  • As shown in FIG. 6, each of the stationary blades (60) includes one porous portion (71) and one non-porous portion (72). Each of the stationary blades (60) is a porous blade (70), part of which is the porous portion (71). In the fixed guide (55) of this embodiment, all the stationary blades (60) are the porous blades (70).
  • In the porous blade (70) of this embodiment, the non-porous portion (72) is formed in a frame shape along the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70). In other words, the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70) of this embodiment are formed by the non-porous portion (72). The non-porous portion (72) is a portion in which substantially no pores are formed. The non-porous portion (72) of this embodiment is a solid portion made of a resin.
  • In the porous blade (70) of this embodiment, the porous portion (71) is provided inside the non-porous portion (72) that is formed in a frame shape. In other words, the porous portion (71) of this embodiment is surrounded by the non-porous portion (72) that is formed in a frame shape.
  • A large number of pores are formed in the porous portion (71) that forms the porous blade (70). The average diameter of the pores of the porous portion (71) is, for example, 140 µm. The average diameter of the pores of the porous portion (71) is, for example, 15 µm or more and 300 µm or less in one preferred embodiment. The porosity of the porous portion (71) (= the total volume of the pores / the volume of the entire part of the porous portion) is, for example, 48%. The porosity of the porous portion (71) is, for example, 35% or more and 90% or less in one preferred embodiment.
  • In the cross section of the stationary blade (60) shown in FIG. 7, the right end is the leading edge (61), the left end is the trailing edge (62), the upper surface is a pressure side surface (65), and the lower surface is a suction side surface (66). In the stationary blade (60) of this embodiment, the portion between "the non-porous portion (72) along the leading edge (61)" and "the non-porous portion (72) along the trailing edge (62)" is the porous portion (71). Thus, the porous portion (71) that forms the porous blade (70) extends from the pressure side surface (65) to the suction side surface (66) of the porous blade (70). The pores formed in the porous portion (71) are continuous from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
  • The porous portion (71) that forms the porous blade (70) is formed by loading fine resin pellets into a mold and then heating these pellets. When the resin pellets in the mold are heated, the resin pellets adjacent to each other are welded to each other at a contact portion so that the resin pellets in the mold are joined to each other. In this manner, the porous portion (71) made of a resin and having a large number of fine pores is formed.
  • The fixed guide (55) is formed by so-called insert molding. Specifically, the eleven stationary blades (60) are disposed in predetermined positions in the mold, and a resin is loaded into the mold, so that the hub (56) and the outer peripheral ring (57) are formed while the hub (56) and the outer peripheral ring (57) are joined to each of the stationary blades (60).
  • As described above, in the fixed guide (55) of this embodiment, all the stationary blades (60) are the porous blades (70). In the porous blade (70) of this embodiment, each of part of the porous blade (70) that is along the leading edge (61) and part of the porous blade (70) that is along the trailing edge (62) is formed by the non-porous portion (72) that is continuous from the blade root (64) to the blade tip (63). Accordingly, in each of the porous blades (70) of the fixed guide (55), the non-porous portion (72) is provided from the blade root (64) to the blade tip (63); one end of the non-porous portion (72) is joined to the hub (56); and the other end of the non-porous portion (72) is joined to the outer peripheral ring (57).
    • -Operation of Outdoor Fan Unit-
  • The impeller (50) is driven by the electric motor (41) and rotates in the arrow direction in FIG. 4 (the counterclockwise direction when viewed from the front). The impeller (50) rotates in this direction to suck the air having passed through the outdoor heat exchanger (23) and discharge the sucked air toward the fixed guide (55).
  • The flow of the air discharged from the impeller (50) turns in the rotation direction of the impeller (50). The flow of the turning air is guided by the stationary blades (60) of the fixed guide (55), and its direction is changed to the forward direction of the fixed guide (55) (in other words, the direction toward the outlet port of the casing (30)). The air having passed through the fixed guide (55) is discharged outside the casing (30) through the outlet port (32).
    • <Noise Reduction Effect of Porous Blade>
  • In the fixed guide (55), air flows along the surfaces of the stationary blades (60) from the leading edge (61) to the trailing edge (62) of the stationary blade (60). The stationary blade (60) causes flow separation of the air flowing from the leading edge (61) to the trailing edge (62). When flow separation occurs, vortexes are generated, and due to the vortexes, noise is generated.
  • The starting point of the flow separation of the air flowing along the pressure side surface (65) of the stationary blade (60) is located in the intermediate region between the leading edge (61) and the trailing edge (62). When the vortex is generated near the pressure side surface (65) of the stationary blade (60) due to the flow separation, the pressure fluctuates near the pressure side surface (65) so that the pressure locally increases.
  • On the other hand, in the fixed guide (55) of this embodiment, all the stationary blades (60) are the porous blades (70). In each of the porous blades (70), the porous portion (71) is disposed in the intermediate region between the leading edge (61) and the trailing edge (62). In the porous portion (71), the pores extending from the pressure side surface (65) to the suction side surface (66) of the porous blade (70) are formed.
  • Thus, the pressure having locally increased near the pressure side surface (65) of the porous blade (70) is released toward the suction side surface (66) of the stationary blade (60) through the pores of the porous portion (71). As a result, the pressure fluctuation near the pressure side surface (65) of the stationary blade (60) is reduced; the growth of the vortex near the pressure side surface (65) is reduced; and the noise due to the vortex near the pressure side surface (65) is reduced.
    • -Feature (1) of First Embodiment-
  • In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all the stationary blades (60) are the porous blades (70). In the fixed guide (55) of this embodiment, each of the porous blades (70) includes one porous portion (71) and one non-porous portion (72).
  • The non-porous portion (72) of this embodiment is formed in a frame shape along the leading edge (61), the blade tip (63), the trailing edge (62), and the blade root (64) of the porous blade (70). Thus, the non-porous portion (72) with higher strength than the porous portion (71) is disposed along the peripheral edge of the porous blade (70). In particular, in each of the porous blades (70) of the fixed guide (55) of this embodiment, the non-porous portion (72) is provided from the blade root (64) to the blade tip (63); one end of the non-porous portion (72) is joined to the hub (56); and the other end of the non-porous portion (72) is joined to the outer peripheral ring (57). Thus, the non-porous portion (72) with higher strength than the porous portion (71) is provided from the blade root (64) to the blade tip (63), and is joined to the hub (56) and the outer peripheral ring (57). Accordingly, according to this embodiment, the strength of the porous blade (70) can be ensured, and as a result, the strength of the entire part of the fixed guide (55) can be ensured.
    • -Feature (2) of First Embodiment-
  • As described above, the starting point of the flow separation of the air flowing along the pressure side surface (65) of the stationary blade (60) is located in the intermediate region between the leading edge (61) and the trailing edge (62). On the other hand, in the porous blade (70) of this embodiment, the porous portion (71) is disposed in the intermediate region between the leading edge (61) and the trailing edge (62). Thus, in the porous blade (70) of this embodiment, part of the pressure side surface (65) of the porous blade (70) in which the starting point of the flow separation is located can be formed by the porous portion (71). Thus, the growth of the vortex generated by the flow separation can be reduced, and the noise due to the vortex near the pressure side surface (65) of the porous blade (70) can be reduced.
  • Accordingly, according to this embodiment, part of the porous blade (70) that is along the peripheral edge of the porous blade (70) is formed by the non-porous portion (72), whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
    • -Variations of First Embodiment-
  • As shown in FIG. 8, in the porous blade (70) of this embodiment, the porous portion (71) may be provided in only part of the porous blade (70) that is close to the leading edge. In the porous blade (70) of this variation, the porous portion (71) is provided between the center line (C) of the porous blade (70) in the width direction and the leading edge (61). The center line (C) of the porous blade (70) in the width direction is the line that connects the midpoints of the chord lines (67) in the cross sections from the blade root (64) to the blade tip (63).
  • The starting point of the flow separation of the air flowing along the pressure side surface (65) of the stationary blade (60) is located in the intermediate region between the leading edge (61) and the center line (C) in many cases. Thus, similarly to the porous blade (70) shown in FIGS. 6 and 7, in the porous blade (70) of this variation, part of the pressure side surface (65) of the porous blade (70) in which the starting point of the flow separation is located can be formed by the porous portion (71). Accordingly, according to this variation as well, the non-porous portion (72) is provided, whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
    • <<Second Embodiment>>
  • The second embodiment will be described. The air conditioner (10) of this embodiment is a modified version of the air conditioner (10) of the first embodiment where the fixed guide (55) of the outdoor fan unit (40) is modified. The following description will focus on the difference between the fixed guide (55) of this embodiment and the fixed guide (55) of the first embodiment.
  • As shown in FIG. 9, in the fixed guide (55) of this embodiment, each of the porous blades (70) includes one porous portion (71) and one non-porous portion (72) similarly to the porous blade (70) of the first embodiment. In the porous blade (70) of this embodiment, about half of the porous blade (70) in the width direction that is close to the leading edge (61) is the porous portion (71), and the remaining about half of the porous blade (70) that is close to the trailing edge (62) is the non-porous portion (72). In the porous blade (70) of this embodiment, each of the porous portion (71) and the non-porous portion (72) extends from the blade root (64) to the blade tip (63) of the porous blade (70). One end of each of the porous portion (71) and the non-porous portion (72) is joined to the hub (56), and the other end of the same is joined to the outer peripheral ring (57).
  • In the porous blade (70) of this embodiment, the configurations of the porous portion (71) and the non-porous portion (72) are the same as the configurations of the porous portion (71) and the non-porous portion (72) of the first embodiment, respectively. In the porous blade (70) of this embodiment, the porous portion (71) extends from the pressure side surface (65) to the suction side surface (66) of the porous blade (70). Further, the pores formed in the porous portion (71) are continuous from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
    • -Features of Second Embodiment-
  • In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all the stationary blades (60) are the porous blades (70). In each of the porous blades (70), the non-porous portion (72) is provided from the blade root (64) to the blade tip (63) of the porous blade (70). Thus, the entire part of the porous blade (70) that is along the trailing edge (62) is formed by the non-porous portion (72) of which the strength is higher than that of the porous portion (71), whereby the strength of the porous blade (70) can be ensured.
  • As described above, the starting point of the flow separation of the air flowing along the pressure side surface (65) of the stationary blade (60) is located in the intermediate region between the leading edge (61) and the center line (C) in many cases. On the other hand, in the porous blade (70) of this embodiment, about half of the porous blade (70) in the width direction that is close to the leading edge (61) is the porous portion (71). Thus, in the porous blade (70) of this embodiment as well, part of the pressure side surface (65) of the porous blade (70) in which the starting point of the flow separation is located can be formed by the porous portion (71) similarly to the first embodiment. Accordingly, according to this embodiment, the non-porous portion (72) is provided, whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
    • -Variation of Second Embodiment-
  • As shown in FIG. 10, in the porous blade (70) of this embodiment, about half of the porous blade (70) in the width direction that is close to the leading edge (61) may be the non-porous portion (72), and the remaining about half of the porous blade (70) that is close to the trailing edge (62) may be the porous portion (71).
    • <<Third Embodiment>>
  • The third embodiment will be described. The air conditioner (10) of this embodiment is a modified version of the air conditioner (10) of the first embodiment where the fixed guide (55) of the outdoor fan unit (40) is modified. The following description will focus on the difference between the fixed guide (55) of this embodiment and the fixed guide (55) of the first embodiment.
  • As shown in FIG. 11, in the fixed guide (55) of this embodiment, each of the porous blades (70) includes one porous portion (71) and one non-porous portion (72) similarly to the porous blade (70) of the first embodiment. In the porous blade (70) of this embodiment, part of the porous blade (70) that is close to the blade tip (63) and that includes a corner on the leading edge side is the porous portion (71), and the remaining part of the porous blade (70) that is close to the blade root (64) is the non-porous portion (72). In the porous blade (70) of this embodiment, the non-porous portion (72) is continuous from the blade root (64) to the blade tip (63) of the porous blade (70).
  • In the porous blade (70) of this embodiment, the configurations of the porous portion (71) and the non-porous portion (72) are the same as the configurations of the porous portion (71) and the non-porous portion (72) of the first embodiment, respectively. In the porous blade (70) of this embodiment, the porous portion (71) extends from the pressure side surface (65) to the suction side surface (66) of the porous blade (70). Further, the pores formed in the porous portion (71) are continuous from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
    • -Features of Third Embodiment-
  • In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all the stationary blades (60) are the porous blades (70). In each of the porous blades (70), part of the porous blade (70) that extends from the blade root (64) to the blade tip (63) is formed by the non-porous portion (72) of which the strength is higher than that of the porous portion (71). Thus, according to this embodiment, the strength of the porous blade (70) can be ensured.
  • Here, the flow velocity of the air sent from the impeller (50) is higher in the outer peripheral side of the impeller (50). Thus, the air discharged from near the outer periphery of the impeller (50) and flowing at a relatively high velocity flows into part of the stationary blade (60) that is close to the blade tip (63). Accordingly, in each of the stationary blades (60), the flow separation is more likely to occur on part of the stationary blade (60) that is close to the blade tip (63) than part of the stationary blade (60) that is close to the blade root (64).
  • On the other hand, in each of the porous blades (70) of this embodiment, part of the porous blade (70) that is close to the blade tip (63) is formed by the porous portion (71). Thus, on part of the porous blade (70) that is close to the blade tip (63) and in which the flow separation is likely to occur, the growth of the vortex can be effectively reduced by the porous portion (71). Accordingly, according to this embodiment, the non-porous portion (72) is provided, whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
    • <<Fourth Embodiment>>
  • The fourth embodiment will be described. The air conditioner (10) of this embodiment is a modified version of the air conditioner (10) of the first embodiment where the fixed guide (55) of the outdoor fan unit (40) is modified. The following description will focus on the difference between the fixed guide (55) of this embodiment and the fixed guide (55) of the first embodiment.
  • As shown in FIG. 12, in the fixed guide (55) of this embodiment, each of the porous blades (70) includes a plurality of porous portions (71) (six porous portions (71) in this embodiment) and one non-porous portion (72). In each of the porous blades (70) of this embodiment, the non-porous portion (72) is formed in a grid shape. The plurality of porous portions (71) are fitted into the non-porous portion (72) in a grid shape. In each of the porous blades (70) of this embodiment, the plurality of porous portions (71) are arranged in the direction from the leading edge (61) to the trailing edge (62) of the porous blade (70) and in the direction from the blade root (64) to the blade tip (63) of the porous blade (70).
  • In this manner, in each of the porous blades (70), the plurality of porous portions (71) are disposed apart from each other, and the non-porous portion (72) is provided between the porous portions (71) adjacent to each other. Further, similarly to the first embodiment, in each of the porous blades (70), each of part of the porous blade (70) that is along the leading edge (61) and part of the porous blade (70) that is along the trailing edge (62) is formed by the non-porous portion (72) that is continuous from the blade root (64) to the blade tip (63).
  • In the porous blade (70) of this embodiment, the configurations of the porous portion (71) and the non-porous portion (72) are the same as the configurations of the porous portion (71) and the non-porous portion (72) of the first embodiment, respectively. In the porous blade (70) of this embodiment, each of the porous portions (71) extends from the pressure side surface (65) to the suction side surface (66) of the porous blade (70). Further, the pores formed in each of the porous portions (71) are continuous from the pressure side surface (65) to the suction side surface (66) of the porous blade (70).
    • -Features of Fourth Embodiment-
  • In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all the stationary blades (60) are the porous blades (70). Each of the porous blades (70) is provided with the non-porous portion (72) formed in a grid shape, and the plurality of porous portions (71) are fitted into the non-porous portion (72) formed in a grid shape. Thus, the non-porous portion (72) of which the strength is higher than that of the porous portion (71) is formed in a grid shape, whereby the strength of the porous blade (70) can be ensured. Further, since the plurality of porous portions (71) are fitted into the non-porous portion (72) formed in a grid shape, the plurality of porous portions (71) are reliably held by the non-porous portion (72).
  • Further, in the porous blade (70) of this embodiment as well, part of the pressure side surface (65) of the porous blade (70) in which the starting point of the flow separation is located can be formed by the porous portion (71). Accordingly, according to this embodiment, the non-porous portion (72) is provided, whereby the strength of the porous blade (70) can be ensured while the growth of the vortex due to the flow separation can be reduced by the porous portion (71). As a result, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
    • <<Fifth Embodiment>>
  • The fifth embodiment will be described. The air conditioner (10) of this embodiment is a modified version of the air conditioner (10) of the first embodiment where the fixed guide (55) of the outdoor fan unit (40) is modified. The following description will focus on the difference between the fixed guide (55) of this embodiment and the fixed guide (55) of the first embodiment.
  • As shown in FIG. 13, in the fixed guide (55) of this embodiment, each of the porous blades (70) includes one porous portion (71) and one non-porous portion (72) similarly to the porous blade (70) of the first embodiment. A large part of the porous blade (70) of this embodiment is the non-porous portion (72). The non-porous portion (72) of this embodiment extends from the blade root (64) to the blade tip (63) of the porous blade (70) while extending from the leading edge (61) to the trailing edge (62) of the porous blade (70). The porous portion (71) of this embodiment is formed in a thin plate shape, and covers the upper surface of the non-porous portion (72) in FIG. 13. In the porous blade (70) of this embodiment, the entire part of the pressure side surface (65) is formed by the porous portion (71), and the entire part of the suction side surface (66) is formed by the non-porous portion (72).
  • In the porous blade (70) of this embodiment, the configurations of the porous portion (71) and the non-porous portion (72) are the same as the configurations of the porous portion (71) and the non-porous portion (72) of the first embodiment, respectively. However, the porous portion (71) of this embodiment only forms the pressure side surface (65) of the porous blade (70), and does not form the suction side surface (66) of the porous blade (70).
    • -Features of Fifth Embodiment-
  • In the fixed guide (55) of the outdoor fan unit (40) of this embodiment, all the stationary blades (60) are the porous blades (70). In each of the porous blades (70) of the fixed guide (55) of this embodiment, the pressure side surface (65) of the porous blade (70) is formed by the porous portion (71). Thus, the fluctuation in pressure due to the vortex generated near the pressure side surface (65) of the porous blade (70) is reduced by the effect of the pores of the porous portion (71) that forms the pressure side surface (65). Accordingly, according to this embodiment, the noise generated by the operation of the outdoor fan unit (40) can be reduced.
    • -Variation of Fifth Embodiment-
  • As shown in FIG. 14, in each of the porous blades (70) of the fixed guide (55) of this embodiment, the porous portion (71) may be provided so as to cover the lower surface of the non-porous portion (72) in FIG. 14. In the porous blade (70) of this variation, the entire part of the pressure side surface (65) is formed by the non-porous portion (72), and the entire part of the suction side surface (66) is formed by the porous portion (71).
  • Although not shown, in each of the porous blades (70) of the fixed guide (55) of this variation, the porous portion (71) may be provided so as to cover the entire surface of the non-porous portion (72). In the porous blade (70) of this variation, both the pressure side surface (65) and the suction side surface (66) are formed by the porous portion (71).
    • <<Other Embodiments>> -First Variation-
  • In the outdoor fan unit (40) of each of the above embodiments, the stationary blades (60) that form the fixed guide (55) may include both the porous blade (70) and the non-porous blade (75). In the fixed guide (55) of this variation, some of the plurality of stationary blades (60) that form the fixed guide (55) are the porous blades (70), and the rest are the non-porous blades (75). The non-porous blade (75) is the stationary blade (60), the entire part of which is formed by the non-porous portion (72).
  • As shown in FIG. 15, in the fixed guide (55) of this variation, the circumferential order in which the porous blades (70) and the non-porous blades (75) are arranged in the circumferential direction of the fixed guide (55) may be irregular. The porous blades (70) are arranged at irregular intervals in the circumferential direction of the fixed guide (55), whereby it may be possible to reduce a periodically-fluctuating component of the noise generated by the operation of the outdoor fan unit (40). FIG. 15 shows the fixed guide (55) of the first embodiment to which this variation is applied.
    • -Second Variation-
  • In the outdoor fan unit (40) of each of the above embodiments, part or the entire part of the rotating blade (52) that forms the impeller (50) may be the porous portion (71).
    • -Third Variation-
  • In each of the above embodiments, the example in which the blowing apparatus is used as the outdoor fan unit (40) of the air conditioner (10) is described, but the blowing apparatus is not limited to being used as the outdoor fan unit (40). For example, the blowing apparatus may be used as an indoor fan unit provided in an indoor unit of an air conditioner, an internal fan unit provided in a container refrigeration apparatus, and the like.
    • <<Reference Example>>
  • In the outdoor fan unit (40) of each of the first to fourth embodiments, the stationary blade (60) of the fixed guide (55) may be provided with a plurality of small-diameter holes (100) instead of the porous portion (71).
  • FIG. 16 shows the stationary blade (60) of the first embodiment to which this reference example is applied. Each of the small-diameter holes (100) is a through hole that runs through the stationary blade (60) in the thickness direction. One end of the small-diameter hole (100) is open in the pressure side surface (65) of the stationary blade (60), and the other end is open in the suction side surface (66) of the stationary blade (60). The diameter of the small-diameter hole (100) is, for example, 0.3 mm or less.
  • While the embodiments and variations thereof have been described above, it will be understood that various changes in form and details may be made without departing from the spirit and scope of the claims. The elements according to the embodiments, the variations thereof, and the other embodiments may be combined and replaced with each other. In addition, the expressions of "first", "second", "third", ... , in the specification and claims are used to distinguish the terms to which these expressions are given, and do not limit the number and order of the terms.
    • INDUSTRIAL APPLICABILITY
  • As described above, the present disclosure is useful for a blowing apparatus and a refrigeration apparatus.
    • DESCRIPTION OF REFERENCE CHARACTERS
    • 10
    Air Conditioner (Refrigeration Apparatus)
    23
    Outdoor Heat Exchanger (Heat Exchanger)
    40
    Outdoor Fan Unit (Blowing Apparatus)
    50
    Impeller (Rotary Member)
    52
    Rotor Blade
    55
    Fixed Guide (Fixed Member)
    56
    Hub (First Holding Portion)
    57
    Outer Peripheral Ring (Second Holding Portion)
    60
    Stator Blade
    61
    Leading Edge
    62
    Trailing Edge
    63
    Blade Tip
    64
    Blade Root
    65
    Positive Pressure Surface
    66
    Negative Pressure Surface
    70
    Porous Blade
    71
    Porous Portion
    72
    Non-Porous Portion
    75
    Non-Porous Blade

Claims (7)

  1. A blowing apparatus (40) comprising:
    a rotary member (50) configured to rotate and having a plurality of rotating blades (52); and
    a fixed member (55) having a plurality of stationary blades (60) and disposed downstream of the rotary member (50),
    wherein
    the fixed member (55) has a first holding portion (56) connected to a blade root (64) of the stationary blade (60) and a second holding portion (57) connected to a blade tip (63) of the stationary blade (60),
    the plurality of stationary blades (60) of the fixed member (55) include a porous blade (70), part of which is a porous portion (71), and
    the porous blade (70) includes a non-porous portion (72) continuous from the blade root (64) to the blade tip (63) of the porous blade (70).
  2. The blowing apparatus of claim 1, wherein
    one or both of a leading edge (61) and a trailing edge (62) of the porous blade (70) are formed by the non-porous portion (72).
  3. The blowing apparatus of claim 1, wherein
    the porous portion (71) of the porous blade (70) includes a plurality of porous portions (71), and
    the non-porous portion (72) is provided between the porous portions (71) adjacent to each other.
  4. The blowing apparatus of any one of claims 1 to 3, wherein
    the porous portion (71) is provided from a pressure side surface (65) to a suction side surface (66) of the porous blade (70), and
    in the porous portion (71), a pore extending from the pressure side surface (65) to the suction side surface (66) of the porous blade (70) is formed.
  5. The blowing apparatus of claim 1, wherein
    the porous portion (71) is provided so as to cover a surface of the non-porous portion (72).
  6. The blowing apparatus of any one of claims 1 to 5, wherein
    the plurality of stationary blades (60) provided on the fixed member (55) include a non-porous blade (75), an entire part of which is the non-porous portion (72).
  7. A refrigeration apparatus comprising:
    the blowing apparatus (40) of any one of claims 1 to 6; and
    a heat exchanger (23) configured to exchange heat between air supplied by the blowing apparatus (40) and a heat medium.
EP24831646.5A 2023-06-30 2024-06-10 Blowing device and refrigeration device Pending EP4696896A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023107984A JP7640886B2 (en) 2023-06-30 2023-06-30 Blower and refrigeration equipment
PCT/JP2024/021028 WO2025004778A1 (en) 2023-06-30 2024-06-10 Blowing device and refrigeration device

Publications (1)

Publication Number Publication Date
EP4696896A1 true EP4696896A1 (en) 2026-02-18

Family

ID=93938748

Family Applications (1)

Application Number Title Priority Date Filing Date
EP24831646.5A Pending EP4696896A1 (en) 2023-06-30 2024-06-10 Blowing device and refrigeration device

Country Status (4)

Country Link
EP (1) EP4696896A1 (en)
JP (1) JP7640886B2 (en)
CN (1) CN121219498A (en)
WO (1) WO2025004778A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6327115Y2 (en) * 1981-05-08 1988-07-22
JPH04272499A (en) * 1991-02-27 1992-09-29 Matsushita Electric Ind Co Ltd Blower and manufacture of its impeller
JPH04295200A (en) * 1991-03-26 1992-10-20 Matsushita Electric Ind Co Ltd Blower impeller
JP3112007B2 (en) 1999-02-15 2000-11-27 ダイキン工業株式会社 Impeller for blower and method of manufacturing the same
JP2008303778A (en) 2007-06-07 2008-12-18 Nippon Densan Corp Fan device
JP2020109258A (en) * 2018-12-28 2020-07-16 日本電産株式会社 Air blowing device

Also Published As

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CN121219498A (en) 2025-12-26
JP7640886B2 (en) 2025-03-06
WO2025004778A1 (en) 2025-01-02
JP2025006932A (en) 2025-01-17

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