WO2025004732A1 - Ventilateur et climatiseur - Google Patents

Ventilateur et climatiseur Download PDF

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Publication number
WO2025004732A1
WO2025004732A1 PCT/JP2024/020630 JP2024020630W WO2025004732A1 WO 2025004732 A1 WO2025004732 A1 WO 2025004732A1 JP 2024020630 W JP2024020630 W JP 2024020630W WO 2025004732 A1 WO2025004732 A1 WO 2025004732A1
Authority
WO
WIPO (PCT)
Prior art keywords
scroll
peripheral wall
air
porous
fan
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.)
Ceased
Application number
PCT/JP2024/020630
Other languages
English (en)
Japanese (ja)
Inventor
洋峻 富岡
貴士 柏原
あづみ 寺川
友梨恵 三船
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
Priority to CN202480031493.7A priority Critical patent/CN121079507A/zh
Publication of WO2025004732A1 publication Critical patent/WO2025004732A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • 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

  • This disclosure relates to fans and air conditioners.
  • Patent Document 1 discloses a sirocco fan.
  • the sirocco fan has an impeller and a casing that surrounds the impeller.
  • the inner surface of the peripheral wall of the casing is scroll-shaped.
  • the present disclosure aims to provide a fan that can suppress the generation of vortex flows originating from the boundary between the scroll section and the discontinuous section.
  • the first embodiment of the fan includes an impeller (33) and a casing (40) having a peripheral wall (43) surrounding the impeller (33) and forming an air passage (46) between the impeller (33) and the peripheral wall (43).
  • the peripheral wall (43) has scroll portions (51, 52) forming a scroll-shaped first inner surface (51a, 52a), and a discontinuous portion (53) bending radially inward relative to the scroll portions (51, 52) and forming a second inner surface (53a) that is not smoothly continuous with the first inner surface (51a, 52a).
  • the peripheral wall (43) is provided with a porous portion (60) within a range from the boundary between the scroll portions (51, 52) and the discontinuous portion (53) to the air outlet (45) of the air passage (46).
  • the peripheral wall (43) is provided with a porous portion (60) within a region extending from the boundary between the scroll portion (51, 52) and the discontinuous portion (53) to the outlet (45) of the air passage (46).
  • the porous portion (60) has a plurality of holes and has a function of suppressing the generation of vortex flows. Therefore, by providing the porous portion (60) within this region, it is possible to suppress the generation of vortex flows downstream of the boundary between the scroll portion (51, 52) and the discontinuous portion (53).
  • the scroll portion (51, 52) is connected to the downstream end of the discontinuous portion (53) in the first embodiment, and the porous portion (60) is provided in the peripheral wall (43) within a region extending from the downstream end of the discontinuous portion (53) to the air outlet (45) of the air passage (46).
  • the scroll section (51, 52) is connected to the downstream end of the discontinuous section (53). Therefore, when the air passage (46) passes through the discontinuous section (53), a vortex is generated starting from the boundary between the discontinuous section (53) and the scroll section (51, 52), causing significant turbulence in the scroll section (51, 52).
  • a porous section (60) is provided within the range of the region from the downstream end of the discontinuous section (53) to the outlet (45) of the air passage (46), thereby suppressing the generation of a vortex in the scroll section (51, 52).
  • the porous portion (60) constitutes the peripheral wall (43).
  • the peripheral wall (43) is formed of a porous portion (60), which reduces the number of parts of the fan (30).
  • the fourth aspect is the third aspect, in which the porous portion (60) is formed from the inner surface to the outer surface of the peripheral wall (43).
  • the porous portion (60) is formed from the inner surface (43a) of the peripheral wall (43) to the outer surface (43b) of the peripheral wall (43).
  • the porous portion (60) is an open cell with multiple holes communicating with each other, so that the air on the inner surface side of the peripheral wall (43) can escape to the outer surface (43b) side of the peripheral wall (43) through the porous portion (60). As a result, the generation of vortexes due to the porous portion (60) can be suppressed.
  • the fifth aspect is the first or second aspect, in which the porous portion (60) is a porous member (61) fixed to the inner surface of the peripheral wall (43).
  • the porous member (61), which is the porous portion (60), is provided on the inner surface of the peripheral wall (43), thereby imparting an effect of suppressing the generation of vortexes in the fan (30).
  • the sixth aspect is any one of the first to fifth aspects, in which the fan is a centrifugal fan.
  • the seventh aspect is an air conditioning device having a fan according to any one of the first to sixth aspects.
  • FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an air-conditioning apparatus according to the present embodiment.
  • FIG. 2 is a side view of the fan.
  • FIG. 3 is a cross-sectional view taken along line III-III in FIG.
  • FIG. 4 is a view of the fan of the first modified example, which corresponds to FIG.
  • FIG. 5 is a view of a fan according to the second modification, which corresponds to FIG.
  • FIG. 6 is an enlarged cross-sectional view of the porous member and its vicinity of the fan of the third modification.
  • the fan (30) is applied to an air conditioning apparatus (10).
  • the air conditioning apparatus (10) conditions indoor air.
  • the air conditioning apparatus (10) of this embodiment adjusts the temperature of the air.
  • the air conditioning apparatus (10) is an outdoor conditioning unit that supplies outdoor air to the room.
  • the air conditioning apparatus (10) has an indoor unit (10a) arranged above the ceiling.
  • the indoor unit (10a) has an air conditioning casing (11), and a fan (30) and an indoor heat exchanger (17) housed in the air conditioning casing (11).
  • the air conditioning casing (11) is in the shape of a horizontally long rectangular box.
  • the air conditioning casing (11) has a first side plate (12) and a second side plate (13) facing each other.
  • An outside air intake port (14) is formed in the first side plate (12), and an air supply port (15) is formed in the second side plate (13).
  • the outside air intake port (14) communicates with the outdoor space via an intake duct.
  • the air supply port (15) communicates with the indoor space via an air supply duct.
  • An air conditioning passage (16) through which air flows is formed inside the air conditioning casing (11) from the outside air intake port (14) to the air supply port (15).
  • the fan (30) is disposed in the air conditioning passage (16).
  • the fan (30) is a centrifugal fan. Strictly speaking, the fan (30) is a centrifugal fan.
  • the indoor heat exchanger (17) exchanges heat between the air and the refrigerant.
  • the indoor heat exchanger (17) is connected to a refrigerant circuit.
  • the refrigerant circuit has a compressor, an outdoor heat exchanger, an expansion valve, and the indoor heat exchanger (17).
  • the refrigerant circuit performs a vapor compression refrigeration cycle by circulating the refrigerant.
  • the compressor and the outdoor heat exchanger are provided in the outdoor unit.
  • the compressor and fan (30) are operated, and the indoor heat exchanger (17) functions as an evaporator.
  • Air that flows into the air conditioning passage (16) from the outside air inlet (14) passes through the indoor heat exchanger (17).
  • the indoor heat exchanger (17) the air is cooled by the evaporating refrigerant.
  • the air cooled in the indoor heat exchanger (17) is supplied to the indoor space via the air supply port (15) and the air supply duct.
  • the compressor and fan (30) are operated, and the indoor heat exchanger (17) functions as a condenser (heat radiator). Air that flows into the air conditioning passage (16) from the outside air inlet (14) passes through the indoor heat exchanger (17). In the indoor heat exchanger (17), the air is heated by the condensing refrigerant. The air heated in the indoor heat exchanger (17) is supplied to the indoor space via the air supply port (15) and the air supply duct.
  • the fan (30) shown in Figures 1 to 3 includes a motor (31), a drive shaft (32) that is rotationally driven by the motor (31), an impeller (33) connected to the drive shaft (32), and a casing (40) that houses the impeller (33).
  • the motor (31) is supported by a motor support base (34).
  • the drive shaft (32) is connected to the motor (31) and extends in the horizontal direction.
  • the fan (30) is of a vertical type in which the drive shaft (32) of the motor (31) extends along the horizontal direction.
  • the impeller (33) has a rotating shaft connected to the drive shaft (32).
  • the impeller (33) has a plurality of blades (33a) that are arranged in the direction of rotation (the direction indicated by the arrow R in Figure 3).
  • the casing (40) has a cylindrical casing body (40a) and a discharge portion (40b) extending from the outer periphery of the casing body (40a) in a tangential direction to the casing body (40a).
  • the casing body (40a) has a first wall (41), a second wall (42), and a peripheral wall (43).
  • the first wall (41) is formed at one axial end of the casing body (40a), and the second wall (42) is formed at the other axial end of the casing body (40a).
  • the first wall (41) is located on the motor (31) side across the impeller (33), and the second wall (42) is located on the opposite side of the impeller (33) from the motor (31).
  • the first wall (41) and the second wall (42) are disk-shaped.
  • a suction port (44) is formed in the center of the second wall (42).
  • the peripheral wall (43) surrounds the outer periphery of the impeller (33).
  • the peripheral wall (43) is substantially arc-shaped along the impeller (33).
  • the discharge section (40b) forms a duct that communicates with the inside of the casing body (40a).
  • the discharge section (40b) is formed in a rectangular tubular shape with both axial ends open.
  • the opening at one axial end of the discharge section (40b) is continuous with the inside of the casing body (40a).
  • the opening at the other axial end of the discharge section (40b) forms the air outlet (45).
  • An air passage (46) through which air flows is formed inside the casing (40) from the suction port (44) to the air outlet (45).
  • the peripheral wall (43) of the fan (30) of this embodiment has, in this order from the upstream side to the downstream side of the air flow in the air passage (46), a first scroll portion (51), a cut portion (53), and a second scroll portion (52).
  • the peripheral wall (43) separates the air passage (46) in the casing (40) from the space outside the casing (40).
  • the first scroll portion (51) and the second scroll portion (52) are scroll-shaped walls.
  • a first scroll surface (51a) is formed on the inside of the first scroll portion (51), and a second scroll surface (52a) is formed on the inside of the second scroll portion (52).
  • the first scroll surface (51a) and the second scroll surface (52a) are examples of a first inner surface.
  • the first scroll surface (51a) and the second scroll surface (52a) have a scroll shape. Strictly speaking, the first scroll surface (51a) and the second scroll surface (52a) form an involute curved surface. When viewed in a cross section perpendicular to the axis of the drive shaft (32), the first scroll surface (51a) and the second scroll surface (52a) are involute curved. The curvature of the first scroll surface (51a) and the second scroll surface (52a) decreases as the direction of rotation of the impeller (33) progresses. The curvature of the second scroll surface (52a) is smaller than the curvature of the first scroll surface (51a).
  • the cut portion (53) is a discontinuous portion.
  • the cut portion (53) is provided between the first scroll portion (51) and the second scroll portion (52).
  • the cut portion (53) connects the downstream end of the first scroll portion (51) and the upstream end of the second scroll portion (52).
  • the cut portion (53) is located on the lower side of the peripheral wall (43).
  • a cut surface (53a) is formed on the inside of the cut portion (53).
  • the cut surface (53a) is a flat surface.
  • the cut surface (53a) extends horizontally from its upstream end to its downstream end. When viewed in a cross section perpendicular to the axis of the drive shaft (32), the cut surface (53a) is a horizontally extending straight line.
  • the cut surface (53a) is an example of a second inner surface.
  • the cut portion (53) bends radially inward of the peripheral wall (43) relative to the first scroll portion (51). Therefore, the first scroll surface (51a) of the first scroll portion (51) does not smoothly connect with the cut surface (53a) of the cut portion (53). In other words, the first scroll surface (51a) and the cut surface (53a) do not share a tangent. Specifically, the downstream end of the first scroll surface (51a) and the upstream end of the cut surface (53a) do not share a tangent.
  • the cut portion (53) bends radially inward of the peripheral wall (43) relative to the second scroll portion (52). Therefore, the second scroll surface (52a) of the second scroll portion (52) does not smoothly connect with the cut surface (53a) of the cut portion (53). In other words, the second scroll surface (52a) and the cut surface (53a) do not share a tangent. Specifically, the upstream end of the second scroll surface (52a) and the downstream end of the cut surface (53a) do not share a tangent.
  • the air flow in the air passage (46) is indicated by dashed arrows.
  • the air passage (46) is formed between the outer peripheral edge of the impeller (33) and the inner surface of the casing (40).
  • the closest portion of the impeller (33) and the peripheral wall (43) corresponds to the inlet of the air passage (46).
  • the radial distance between the cut portion (53) and the impeller (33) is narrower than the radial distance between the second scroll portion (52) and the impeller (33).
  • the radial width of the air passage (46) increases as it progresses in the direction of rotation, particularly between the second scroll portion (52) and the impeller (33).
  • the inner surface of the peripheral wall (43) has some portions that are not smoothly continuous. Specifically, the cut surface (53a) and the second scroll surface (52a) are not smoothly continuous (not tangent continuous). For this reason, in the air passage (46), air near the inner surface of the peripheral wall (43) is separated from the boundary (a) between the cut surface (53a) and the second scroll surface (52a), and vortex flow is likely to be generated. When a vortex flow is generated from the boundary (a), the air passing through the second scroll surface (52a) is significantly disturbed, resulting in a problem of noise generation.
  • the porous part (60) is provided in the peripheral wall (43).
  • the porous part (60) is made of a porous material having a large number of continuous fine pores.
  • the porous material is a resin, a ceramic, a metal, or the like.
  • the resin is, for example, a foamed resin.
  • the metal and ceramic are porous sintered bodies.
  • the average diameter of the pores (voids) in the porous part (60) is, for example, in the range of 15 ⁇ m to 300 ⁇ m.
  • the porous portion (60) is provided within the range of the peripheral wall (43) from the boundary (a) between the cut surface (53a) and the second scroll surface (52a) to the outlet (45). In other words, the porous portion (60) is provided within the range of the area from the downstream end of the cut portion (53) to the outlet (45). In this embodiment, the porous portion (60) is provided from the boundary (a) to the outlet (45). The porous portion (60) is formed across both ends of the peripheral wall (43) in the axial direction.
  • the porous portion (60) has the function of suppressing the generation of vortex currents in the air passage (46). By providing the porous portion (60) from the boundary (a) to the air outlet (45), the generation of vortex currents originating from the boundary (a) can be suppressed.
  • the porous portion (60) constitutes the peripheral wall (43) of the casing (40).
  • the porous portion (60) is formed from the inner surface (43a) to the outer surface (43b) of the peripheral wall (43).
  • the air passage (46) in the casing (40) and the outside of the casing (40) are connected through a plurality of holes in the porous portion (60).
  • the cut portion (53) and the first scroll portion (51) are not provided with a porous portion (60).
  • the porous portion (60) is provided only within the range of the region of the peripheral wall (43) from the boundary (a) between the cut surface (53a) and the second scroll surface (52a) to the outlet (45).
  • a non-porous portion, not a porous portion (60) is provided upstream from the boundary (a). This makes it possible to prevent the portion of the peripheral wall (43) where the porous portion (60) is provided from becoming excessively large.
  • the peripheral wall (43) of the fan (30) in this embodiment has a second scroll portion (52) that forms a scroll-shaped second scroll surface (52a), and a cut portion (53) that is bent radially inward relative to the second scroll portion (52) and forms a cut surface (53a) that is not smoothly continuous with the second scroll surface (52a).
  • a portion of the casing (40) can be made smaller in the radial direction.
  • the discontinuous portion (53) is provided in the scroll portions (51, 52)
  • the first inner surface (51a, 52a) of the scroll portions (51, 52) and the second inner surface (53a) of the discontinuous portion (53) are not smoothly connected, so that air is more likely to separate from the inner surface starting from the boundary between the two, and vortexes are more likely to occur starting from the boundary.
  • a porous portion (60) is provided in the peripheral wall (43) within the range of the region from the boundary (a) between the second scroll portion (52) and the cut portion (53) to the outlet (45) of the air passage (46).
  • a porous portion (60) is provided in the peripheral wall (43) within the range of the region from the boundary (a) between the second scroll portion (52) and the cut portion (53) to the outlet (45) of the air passage (46).
  • the porous portion (60) constitutes a part of the peripheral wall (43).
  • the porous portion (60) also serves as a partition wall for forming the air passage (46). This allows the number of parts of the fan (30) to be reduced.
  • the porous portion (60) is formed from the inner surface (43a) to the outer surface (43b) of the peripheral wall (43). This makes it possible to suppress air pressure fluctuations downstream of the boundary (a), effectively suppressing the generation of vortexes originating from the boundary (a).
  • the above-described fan (30) may have the following modified configurations. The following describes the differences from the above embodiment.
  • the porous portion (60) is provided within a range of an area from a boundary (b) between the first scroll portion (51) and the cut portion (53) to the outlet (45). In other words, the porous portion (60) is provided within a range of an area from the upstream end of the cut portion (53) to the outlet (45). In the example of Fig. 4, the porous portion (60) is provided from the boundary (b) to the outlet (45). The porous portion (60) is not provided in the first scroll portion (51).
  • the second scroll portion (52) is provided with a porous portion (60), and the discharge portion (40b) is not provided with a porous portion (60).
  • the porous portion (60) is provided from the boundary (a) to the downstream end of the second scroll portion (52). This makes it possible to suppress the generation of a vortex flow originating from the boundary (a).
  • the porous portion (60) is not provided in the cut portion (53), but the porous portion (60) may be provided in the cut portion (53) as in the first modification.
  • the fan (30) may be any type as long as it has a casing (40) in which the scroll portions (51, 52) and the discontinuous portion (53) are formed, and may be, for example, a turbo fan.
  • the fan (30) may be horizontally mounted with the drive shaft (32) extending vertically, or may be positioned so that the drive shaft (32) extends in another direction.
  • the fan (30) may be a double-suction fan in which suction ports (44) are formed in both the first wall (41) and the second wall (42).
  • Two or more cut portions (53) may be provided in the peripheral wall (43).
  • the cut portions (53) may be formed on the upper side or the side of the peripheral wall (43).
  • a porous portion (60) may be provided in the peripheral wall (43) from the middle of the cut portion (53) over a predetermined range of the scroll portion (51, 52).
  • the cut portion (53) does not have to be flat, and may be an arc-shaped plate as long as it is bent radially inward relative to the scroll portions (51, 52).
  • the air conditioning device (10) may be an air purifier that purifies the air in the target space, a ventilation device that ventilates the target space, or a humidity control device that adjusts the humidity in the target space.
  • the indoor unit (10a) may be a ceiling-mounted, wall-mounted, or floor-standing type.
  • the present disclosure is useful for fans and air conditioning devices.
  • Air conditioning equipment 10
  • Fans 33 Impeller 40 Casing 43 Perimeter Wall 45
  • Air outlet 46 Air passage 51,52 Scroll section 51a, 52a First inner surface 53 Cut section (discontinuous section) 53a Cut surface (second inner surface) 60
  • Porous part 61

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

L'invention concerne une paroi périphérique (43) qui comprend : des parties spiralées (51, 52) qui forment chacune une première surface intérieure en forme de spirale (51a, 52a) ; et une partie non continue (53) courbée radialement vers l'intérieur par rapport aux parties spiralées (51, 52), et qui forme une seconde surface interne (53a) qui n'est pas continue de façon régulière avec les premières surfaces internes (51a, 52a). La paroi périphérique (43) est pourvue d'une partie poreuse (60) dans la plage d'une région allant de la limite entre les parties spiralées (51, 52) et la partie non continue (53) à un orifice de vidange (45) d'un passage d'air (46).
PCT/JP2024/020630 2023-06-30 2024-06-06 Ventilateur et climatiseur Ceased WO2025004732A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202480031493.7A CN121079507A (zh) 2023-06-30 2024-06-06 风扇及空调装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023-107923 2023-06-30
JP2023107923A JP7640885B2 (ja) 2023-06-30 2023-06-30 ファンおよび空気調和装置

Publications (1)

Publication Number Publication Date
WO2025004732A1 true WO2025004732A1 (fr) 2025-01-02

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ID=93938331

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PCT/JP2024/020630 Ceased WO2025004732A1 (fr) 2023-06-30 2024-06-06 Ventilateur et climatiseur

Country Status (3)

Country Link
JP (1) JP7640885B2 (fr)
CN (1) CN121079507A (fr)
WO (1) WO2025004732A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55106395U (fr) * 1979-01-22 1980-07-25
JPH0466394U (fr) * 1990-10-18 1992-06-11
JPH05240193A (ja) * 1992-02-29 1993-09-17 Hideo Yoshikawa 流体機器の騒音低減構造

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4906555B2 (ja) * 2007-03-27 2012-03-28 三菱電機株式会社 シロッコファン及び空気調和装置
AU2018424471B2 (en) * 2018-05-21 2022-01-13 Mitsubishi Electric Corporation Centrifugal blower, air-sending device, air-conditioning device, and refrigeration cycle device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55106395U (fr) * 1979-01-22 1980-07-25
JPH0466394U (fr) * 1990-10-18 1992-06-11
JPH05240193A (ja) * 1992-02-29 1993-09-17 Hideo Yoshikawa 流体機器の騒音低減構造

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JP7640885B2 (ja) 2025-03-06
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