Search

EP-4509719-B1 - FAN AND AIR CONDITIONING DEVICE

EP4509719B1EP 4509719 B1EP4509719 B1EP 4509719B1EP-4509719-B1

Inventors

  • MIFUNE, Yurie
  • TOMIOKA, HIROTAKA
  • KASHIHARA, TAKASHI
  • TERAKAWA, AZUMI

Dates

Publication Date
20260513
Application Date
20240614

Claims (7)

  1. A fan comprising: a plate (36) having a discoidal shape and configured to rotate about an axis (X); an annular ring portion (37) having an annular ring shape and located apart from the plate (36) in an axial direction of the axis (X); and a blade (35) located between the plate (36) and the annular ring portion (37) and having one end (35a) in the axial direction of the axis (X) joined to the plate (36) and the other end (35b) in the axial direction joined to the annular ring portion (37), part of the blade (35) being a porous portion (51, 151, 251, 351, 451), wherein a first joint portion (35f), being a part of the blade (35) that is in contact with the annular ring portion (37), is a non-porous portion (52, 152, 252, 352, 452), characterised in that the porous portion (51, 151, 251, 351, 451) includes a leading edge (35c) of the blade (35)
  2. The fan of claim 1, wherein the porous portion (51, 151, 251, 351, 451) is located at a separation portion (35g) where airflow separation along the blade (35) occurs.
  3. The fan of claim 1or 2, wherein a second joint portion (35e) being a part of the blade (35) that is in contact with the plate (36) is an entirety of the one end (35a) of the blade (35), the first joint portion (35f) is a portion of the blade (35) at a trailing edge (35d) and the other end (35b), and a dimension from the plate (36) to the other end (35b) of the blade (35) is defined as a blade height (H) and a dimension from the leading edge (35c) to the trailing edge (35d) of the blade (35) is defined as a blade chord length (L), and the porous portion (51, 151, 251, 351) is located in a region that is 90% or less of the blade height (H), and 90% or less of the blade chord length (L) from the leading edge (35c).
  4. The fan of claim 3, wherein a length from the leading edge (35c) to an end of the porous portion (51, 151, 251, 351) closer to the trailing edge (35d) in a direction perpendicular to the axial direction is longer at a portion closer to the other end (35b) than at a portion closer to the one end (35a).
  5. The fan of claim 3 or 4, wherein the porous portion (51, 151, 251, 351) is located in a region defined by connecting a first vertex (P1), a second vertex (P2), and a third vertex (P3) by straight lines or curves, the first vertex (P1) being a point of the blade (35) at the other end (35b) and at the leading edge (35c), the second vertex (P2) being a point at 90% of the blade height (H) from the first vertex (P1), the third vertex (P3) being a point at 90% of the blade chord length (L) from the first vertex (P1), as viewed from a rotational direction about the axis (X).
  6. The fan of any one of claims 1 to 5, wherein the fan is a centrifugal fan.
  7. An air conditioner comprising the fan (33) of any one of claims 1 to 6.

Description

TECHNICAL FIELD The present disclosure relates to a fan and an air conditioner. BACKGROUND ART Patent Document 1 discloses a sirocco fan as a fan. Blades of the sirocco fan are fixed to an upper fixed frame and a lower disk. The entirety of each blade of the sirocco fan is made of a porous material, such as metal, synthetic resin, or ceramic. A further background of the present invention can be found in Patent Documents 2 and 3. CITATION LIST PATENT DOCUMENTS Patent Document 1: Japanese Unexamined Patent Publication No. S63-032196Patent Document 2: JP H02 207196 APatent Document 3: JP H04 12199 A SUMMARY OF THE INVENTION TECHNICAL PROBLEM When the fan rotates, stress tends to be concentrated on a joint portion between the blades and other components. In the structure in which the entirety of each blade is formed as a porous portion as in the fan of Patent Document 1, the strength is lowered at the j oint portion. The present disclosure improves the quietness of a fan while increasing the strength of a blade. SOLUTION TO THE PROBLEM A first aspect is directed to a fan according to claim 1. According to the first aspect, the first joint portion (35f), where stress is easily concentrated, is configured as the non-porous portion (52), thereby making it possible to increase the strength of the blade (35). It is also possible to reduce the airflow separation since part of the blade is the porous portion (51). The reduction in the airflow separation improves the quietness. It is thus possible to improve the quietness while increasing the strength of the blade (35). A second aspect is an embodiment of the first aspect. In the second aspect, the porous portion (51) is located at a separation portion (35g) where airflow separation along the blade (35) occurs. According to the second aspect, the porous portion (51) located at the separation portion (35g) effectively reduces the airflow separation. It is thus possible to improve the quietness. According to the first aspect, the leading edge (35c), where the airflow separation easily occurs, is configured as the porous portion (51), thereby reducing the airflow separation effectively. It is thus possible to improve the quietness. A third of aspect is an embodiment of the first or second aspect. In the third aspect, the joint portion (35e) between the blade (35) and the plate (36) is an entirety of the one end (35a) of the blade (35), the joint portion (35f) between the blade (35) and the annular ring portion (37) is a portion of the blade (35) at a trailing edge (35d) and the other end (35b), and a dimension from the one end (35a) of the blade (35) to the plate (36) is defined as a blade height (H) and a dimension from the leading edge (35c) to the trailing edge (35d) of the blade (35) is defined as a blade chord length (L), and the porous portion (51) is located in a region that is 90% or less of the blade height (H), and 90% or less of the blade chord length (L) from the leading edge (35c). According to the third aspect, since the porous portion (51) is located as widely as possible, it is possible to improve the quietness. In addition, since the region where the non-porous portion (52) is located can be ensured, it is possible to increase the strength of the blade (35). A fourth aspect is an embodiment of the third aspect. In the fourth aspect, a length from the leading edge (35c) to an end of the porous portion (51) closer to the trailing edge (35d) in a direction perpendicular to the axial direction is longer at a portion closer to the other end (35b) than at a portion closer to the one end (35a). According to the fourth aspect, around the joint portion between the blade (35) and the plate (36), the region where the porous portion (51) is located is narrow. It is thus possible to increase the strength of the blade (35). A fifth aspect is an embodiment of the third or fourth fifth aspect. In the fifth aspect, the porous portion (51) is located in a region defined by connecting a first vertex (P1), a second vertex (P2), and a third vertex (P3) by straight lines or curves, the first vertex (P1) being a point of the blade (35) at the other end (35b) and at the leading edge (35c), the second vertex (P2) being a point at 90% of the blade height (H) from the first vertex (P1), the third vertex (P3) being a point at 90% of the blade chord length (L) from the first vertex (P1), as viewed from a rotational direction about the axis (X). According to the fifth aspect, since the porous portion (51) is located at a large part of the leading edge, it is possible to improve the quietness. The region of the non-porous portion (52) around the joint portions (35e, 35f) can be as wide as possible. It is thus possible to increase the strength of the blade (35). A sixth aspect is an embodiment of any one of the first to fifth aspects. In the sixth aspect, the fan is a centrifugal fan. According to the sixth aspect, a relatively great centrifugal force is generated in the centrifugal fan