Fan and air conditioning device

Abstract

To improve quietness while increasing the strength of a blade in a fan.SOLUTION: A fan comprises: a disk-shaped plate (36) to be rotated around a rotation axis (X); an annular-shaped annular part (37) located separately in an axial direction of the rotation axis (X) with respect to the plate (36); and a blade (35) of which one end (35a) in the axial direction of the rotation axis (X) is joined to the plate (36), and of which the other end (35b) in the axial direction of the rotation axis (X) is joined to the annular part (37). The blade (35) comprises a porous part (51) in a portion. A joint portion (35e) between the blade (35) and the plate (36) or a joint portion (35f) between the blade (35) and the annular part (37) is a non-porous part (52).SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a fan and an air conditioning apparatus. [Background technology]

[0002] Patent Document 1 discloses a sirocco fan as a fan. The blades of the sirocco fan are fixed to an upper fixed frame and a lower disk. The blades of the sirocco fan are entirely made of porous materials such as metal, synthetic resin, or ceramic. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 63-032196 Summary of the Invention [Problem to be solved by the invention]

[0004] When a fan rotates, stress tends to concentrate at the joints between the blades and other components. In a structure in which the entire blade is made porous, like the fan in Patent Document 1, the strength of the joints is reduced.

[0005] The present disclosure provides a fan that improves noise reduction while increasing the strength of the blades. [Means for solving the problem]

[0006] The first aspect is directed to a fan. The fan includes a disk-shaped plate (36) that rotates about a rotation axis (X), an annular ring portion (37) that is positioned away from the plate (36) in the axial direction of the rotation axis (X), and a blade (35) that is positioned between the plate (36) and the ring portion (37) and has one end (35a) in the axial direction of the rotation axis (X) joined to the plate (36) and the other end (35b) in the axial direction joined to the ring portion (37), the blade (35) has a porous portion (51) in part, and a joint portion (35e) between the blade (35) and the plate (36) or a joint portion (35f) between the blade (35) and the ring portion (37) is a non-porous portion (52).

[0007] In the first aspect, the joining portions (35e, 35f), where stress is likely to concentrate, are made of non-porous portions (52), thereby increasing the strength of the blades (35). In addition, because a portion of the blade is made of porous portions (51), separation of air can be suppressed. Suppression of separation of air improves noise reduction. Therefore, noise reduction can be improved while increasing the strength of the blades (35).

[0008] In the second aspect, in the first aspect, the porous portion (51) is disposed at a separation portion (35g) where air flowing along the blade (35) separates.

[0009] In the second aspect, by disposing the porous portion (51) in the separation portion (35g), separation of air is effectively suppressed, thereby improving noise reduction.

[0010] In a third embodiment, in the first embodiment, the porous portion (51) includes a leading edge (35c) of the blade (35).

[0011] In the third aspect, the leading edge (35c), which is a portion where air is likely to separate, is made into the porous portion (51), so that separation of air is effectively suppressed, thereby improving noise reduction.

[0012] In a fourth aspect, in the second or third aspect, the joint portion (35e) between the blade (35) and the plate (36) is the entire one end (35a) of the blade (35), and the joint portion (35f) between the blade (35) and the annular portion (37) is the trailing edge (35d) and the other end (35b) of the blade (35). The dimension from the one end (35a) of the blade (35) to the plate (36) is defined as a blade height (H), and the dimension from the leading edge (35c) to the trailing edge (35d) of the blade (35) is defined as a blade chord length (L). The porous portion (51) is disposed in a range that is 90% or less of the blade height (H) and is from the leading edge (35c) to 90% or less of the blade chord length (L).

[0013] In the fourth aspect, the porous portion 51 is disposed as widely as possible, thereby improving noise reduction. Also, the range for disposing the non-porous portion 52 can be secured, thereby improving the strength of the blades 35.

[0014] The fifth aspect is the fourth aspect, wherein, in a direction perpendicular to the axial direction, the length from the leading edge (35c) to the end of the porous portion (51) on the trailing edge (35d) side is longer on the other end (35b) side than on the one end (35a) side.

[0015] In the fifth aspect, the area in which the porous portion 51 is provided is narrow around the joint between the blade 35 and the plate 36. This improves the strength of the blade 35.

[0016] The sixth aspect is the fourth or fifth aspect, in which, when viewed from the direction of rotation about the rotation axis (X), a first vertex (P1) is defined as the position of the other end (35b) and the leading edge (35c) of the blade (35), a second vertex (P2) is defined as a position that is 90% of the blade height (H) from the first vertex (P1), and a third vertex (P3) is defined as a position that is 90% of the blade chord length (L) from the first vertex (P1), and the porous portion (51) is arranged in a range connecting the first vertex (P1), the second vertex (P2), and the third vertex (P3) by a straight line or a curve.

[0017] In the sixth aspect, the porous portion (51) is disposed over most of the leading edge, thereby improving noise reduction. The non-porous portion (52) can be arranged as wide as possible around the joints (35e, 35f), thereby improving the strength of the blades (35).

[0018] In a seventh aspect, the fan in any one of the first to sixth aspects is a centrifugal fan.

[0019] In the seventh aspect, in the case of a centrifugal fan, a relatively large centrifugal force is generated. Stress due to the centrifugal force is likely to concentrate at the joints (35e, 35f). By making the joints (35e, 35f) non-porous parts (52), the strength of the blades (35) can be ensured. In addition, since part of the blade is a porous part (51), separation of air can be suppressed. Suppression of separation of air improves quietness. Therefore, quietness can be improved while increasing the strength of the blades (35) against centrifugal force.

[0020] An eighth aspect is an air conditioner including the fan according to any one of the first to seventh aspects. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a vertical cross-sectional view showing a schematic configuration of an air conditioner. [Diagram 2] FIG. 2 is a side view of the fan. [Diagram 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a perspective view of the fan. [Diagram 5] FIG. 5 is a side view of the blade as viewed in the direction of rotation about the axis of rotation. [Figure 6] FIG. 6 is an enlarged view of the blade as viewed in the axial direction of the rotation shaft. [Figure 7] FIG. 7 is a side view of a blade according to the first modification. [Figure 8] FIG. 8 is a side view of a blade according to the second modification. [Figure 9] FIG. 9 is a side view of a blade according to the third modification. [Figure 10] FIG. 10 is a side view of a wing according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical idea of ​​the present disclosure. Since each drawing is intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

[0023] (1) Air conditioning equipment The fan unit (30) is applied to an air conditioner (10). The air conditioner (10) conditions indoor air. The air conditioner (10) of this embodiment adjusts the temperature of the air. The air conditioner (10) is an outdoor conditioning unit that supplies outdoor air to the room. As shown in FIG. 1, the air conditioner (10) has an indoor unit (10a) placed in the attic. The indoor unit (10a) has an air conditioning casing (11), and a fan unit (30) and an indoor heat exchanger (17) housed in the air conditioning casing (11).

[0024] The air conditioning casing (11) is in the shape of a horizontally long rectangular parallelepiped box. The air conditioning casing (11) has a first side plate (12) and a second side plate (13) facing each other. An outside air inlet (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 inlet (14) communicates with an outdoor space via an intake duct. The air supply port (15) communicates with an indoor space via an intake duct. An air passage (16) through which air flows is formed inside the air conditioning casing (11) from the outside air inlet (14) to the air supply port (15).

[0025] The fan unit 30 is disposed in the air passage 16. Strictly speaking, the fan unit 30 is a centrifugal fan unit.

[0026] The indoor heat exchanger (17) exchanges heat between air and a refrigerant. The indoor heat exchanger (17) is connected to a refrigerant circuit. The refrigerant circuit includes 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.

[0027] During cooling operation, the compressor and the fan unit (30) are operated, and the indoor heat exchanger (17) functions as an evaporator. Air flowing into the air passage (16) from the outside air inlet (14) passes through the indoor heat exchanger (17). In 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.

[0028] During heating operation, the compressor and fan device (30) are operated, and the indoor heat exchanger (17) functions as a condenser (heat radiator). Air flowing into the air 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.

[0029] (2) Overview of the fan The fan device (30) shown in Figures 1 to 3 includes a motor (31), a drive shaft (32) that is rotationally driven by the motor (31), a fan (33) connected to the drive shaft (32), and a casing (40) that houses the fan (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 device (30) is of a vertical installation type in which the drive shaft (32) of the motor (31) extends along the horizontal direction.

[0030] The fan (33) is connected to the drive shaft (32). The fan (33) is a centrifugal fan. The fan (33) has a plurality of blades (35) arranged in the direction of rotation. In the case of Fig. 3, the fan (33) rotates counterclockwise around the rotation axis (X).

[0031] 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 of the casing body (40a).

[0032] 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 with the fan (33) in between, and the second wall (42) is located on the opposite side of the fan (33) from the motor (31). The first wall (41) and the second wall (42) are disk-shaped. A first suction port (47) is formed in the center of the first wall (41). A second suction port (44) is formed in the center of the second wall (42). The peripheral wall (43) surrounds the outer periphery of the fan (33). The peripheral wall (43) has a generally arcuate shape along the fan (33).

[0033] The discharge section (40b) constitutes 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. One axial end opening of the discharge section (40b) connects with the inside of the casing body (40a). The other axial end opening of the discharge section (40b) constitutes an air outlet (45). A fan flow path (46) through which air flows is formed inside the casing (40) from the first suction port (47) and the second suction port (44) to the air outlet (45).

[0034] (3) Fan structure The fan (33) shown in Fig. 4 has a plurality of blades (35), a disk-shaped plate (36), a first ring (37) positioned away from the plate (36) in the axial direction of the rotation shaft (X), and a second ring (38) positioned between the plate (36) and the first ring (37) in the axial direction of the rotation shaft (X). The blades (35), first ring (37), and second ring (38) are disposed on both sides of the plate (36) in the axial direction of the rotation shaft (X).

[0035] The blade (35) is disposed parallel to the axial direction of the rotation shaft (X). The blade (35) is located between the plate (36) and the first ring (37). One end (35a) of the blade (35) in the axial direction of the rotation shaft (X) is joined to the plate (36), and the other end (35b) in the axial direction of the blade (35) is joined to the first ring (37). In the radial direction perpendicular to the axial direction of the rotation shaft (X), the blade (35) has a leading edge (35c) on the inside and a trailing edge (35d) on the outside. In this specification, in the direction along the axial direction of the rotation shaft (X) of the blade (35), the plate (36) side is referred to as one end side, and the first ring (37) side is referred to as the other end side.

[0036] The plate 36 has a boss 36a at its center. The boss 36a is connected to the drive shaft 32. A joint 35e between the blade 35 and the plate 36 is the entire one end 35a of the blade 35. The blade 35 and the plate 36 are joined together by integral molding or an insert.

[0037] The first ring (37) is disposed concentrically with the plate (36). In the radial direction, the first ring (37) is disposed outside the blade (35). A joint portion (35f) between the blade (35) and the first ring (37) is a trailing edge (35d) and the other end (35b) of the blade (35). The blade (35) and the first ring (37) are integrally joined by integral molding or welding.

[0038] The second ring (38) is disposed concentrically with the plate (36). In the axial direction of the rotation axis (X), the second ring (38) is located at the center of the blade (35). In the radial direction, the second ring (38) is disposed outside the blade (35). The second ring (38) is joined to the trailing edge (35d) of the blade (35). The blade (35) and the second ring (38) are joined together by integral molding or welding.

[0039] (4) Wing structure The blade (35) has a porous portion (51) in a portion thereof. The porous portion (51) has a plurality of fine holes that communicate from the positive pressure side to the negative pressure side of the blade (35). The porous portion (51) is made of resin, ceramics, metal, or the like. The resin is, for example, a foamed resin. The metal or ceramic is a porous sintered body. The average diameter of the pores (voids) in the porous portion (51) is, for example, in the range of 15 μm to 300 μm. The porosity of the porous portion (51) (= volume of voids / total volume of the porous portion) is, for example, in the range of 35% to 90%.

[0040] In the blade (35), the portion other than the porous portion (51) is a non-porous portion (52). The joint portion (35e) between the blade (35) and the plate (36) and the joint portion (35f) between the blade (35) and the first ring (37) are non-porous portions (52). The joint portion between the blade (35) and the second ring (38) is also a non-porous portion (52). The non-porous portion (52) does not have holes that communicate from the positive pressure side to the negative pressure side and is solid. The non-porous portion (52) is made of, for example, a synthetic resin. The strength of the non-porous portion (52) is higher than that of the porous portion (51). The porous portion (51) and the non-porous portion (52) are integrally formed by, for example, insert molding, bonding, or fitting.

[0041] The porous portion (51) is disposed at a separation portion (35g) where air flowing along the blades (35) separates. When air separates at the separation portion (35g), a vortex is likely to occur. When a vortex occurs, the air flow is significantly disturbed, causing a problem of noise generation. In this embodiment, in order to solve the above problem, the porous portion (51) is provided at the separation portion (35g).

[0042] As shown in FIGS. 5 and 6, the separation portion (35g) is the leading edge (35c) and the apex (35h) of the warp on the negative pressure side of the blade (35). In the case of a sirocco fan as in this embodiment, the air is particularly likely to separate on the negative pressure side of the leading edge (35c) as the air flows from the inside to the outside in the radial direction. For this reason, the porous portion (51) is disposed over almost the entire leading edge (35c). Note that it is sufficient that the porous portion (51) includes a part of the separation portion (35g). It is not necessary that the entire separation portion (35g) is the porous portion (51).

[0043] The installation range of the porous portion (51) will be described in detail. As shown in Fig. 5 and Fig. 6, the dimension from the other end (35b) of the blade (35) to the plate (36) is the blade height (H). The dimension from the leading edge (35c) to the trailing edge (35d) of the blade (35) is the blade chord length (L). When viewed from the direction of rotation, the position of the other end (35b) and the leading edge (35c) of the blade (35) is the first vertex (P1). In the blade (35), the position from the first vertex (P1) to 90% of the blade height (H) along the axial direction of the rotation axis (X) is the second vertex (P2). In the blade (35), the position from the first vertex (P1) to 90% of the blade chord length (L) is the third vertex (P3).

[0044] As shown in FIG. 5, the porous portion (51) is disposed within a range of 90% or less of the blade height (H) from the other end (35b) and 90% or less of the blade chord length (L) from the leading edge (35c). More specifically, the porous portion (51) is disposed within a specific range (R) connecting the first vertex (P1), the second vertex (P2), and the third vertex (P3) with straight lines or curves. In this embodiment, the porous portion (51) is disposed throughout the specific range (R). In this embodiment, the shape of the porous portion (51) is triangular when viewed from the direction of rotation. Note that the shape of the porous portion (51) is not limited to a triangular shape.

[0045] In this embodiment, the length from the leading edge (35c) to the trailing end of the porous portion (51) in the radial direction is longer at the other end (35b) of the blade (35) than at the one end (35a) of the blade (35). More specifically, the length from the leading edge (35c) to the trailing end of the porous portion (51) is longer the closer to the other end (35b) of the blade (35) and is longest at the other end (35b) of the blade (35).

[0046] (5) Effects of the embodiment In this embodiment, the blades (35) have a porous portion (51) in part, and a joint portion (35e) between the blades (35) and the plate (36) and a joint portion (35f) between the blades (35) and the first ring (37) are non-porous portions (52). By making the joint portions (35e, 35f), where stress is likely to concentrate, non-porous portions (52), it is possible to increase strength against centrifugal force. In addition, because the blades (35) are partially porous portions (51), it is possible to suppress air separation. By suppressing air separation, the quietness of the fan device (30) is improved. Therefore, it is possible to improve the quietness of the fan device (30) while increasing the strength of the blades (35) against centrifugal force.

[0047] In this embodiment, the porous portion (51) is disposed at a separation portion (35g) where air flowing along the blades (35) separates. By disposing the porous portion (51) at the separation portion (35g), separation of the air is effectively suppressed. As a result, the noise level of the fan unit (30) can be improved.

[0048] In this embodiment, the porous portion (51) includes the leading edge (35c) of the blade (35). By forming the leading edge (35c), which is a portion where air is likely to separate, as the porous portion (51), separation of air is effectively suppressed. As a result, the noise level of the fan unit (30) can be improved.

[0049] In this embodiment, the porous portion (51) is disposed within a range of 90% or less of the blade height (H) from the other end (35b) of the blade (35) and 90% or less of the blade chord length (L) from the leading edge (35c). Since the porous portion (51) is disposed as widely as possible, the noise reduction of the fan unit (30) can be improved.

[0050] In this embodiment, the length from the leading edge 35c to the end of the porous portion 51 on the trailing edge 35d side in the radial direction of the rotation axis X is longer at the other end 35b side than at the one end 35a side. The area in which the porous portion 51 is installed is narrow around the joint 35e between the blade 35 and the plate 36. This improves the strength of the blade 35 against centrifugal force.

[0051] In the sixth embodiment, the porous portion (51) is disposed in an area defined by connecting the first vertex (P1), the second vertex (P2), and the third vertex (P3) with a straight line or a curve. Since the porous portion (51) is disposed in most of the leading edge (35c), the noise reduction of the fan device (30) can be improved. Since the area of ​​the non-porous portion (52) can be made as large as possible around the joints (35e, 35f), the strength of the blades (35) against centrifugal force can be improved.

[0052] (6) Variations The above-described fan device (30) may have the following modified configurations. The following describes the differences from the above-described embodiment.

[0053] (6-1) Variation 1 In this first modification, the arrangement range of the porous portion (151) is different. As shown in Fig. 7, the porous portion (151) is not provided in the specific range (R) on the other end (35b) side and the trailing edge (35d) side of the blade (35). In this portion of the specific range (R), a non-porous portion (152) is arranged.

[0054] In this first modification, the non-porous portion (152) is wider around the joint portion (35f) between the blade (35) and the first ring (37). This improves the strength of the blade (35) against centrifugal force. Also, in this first modification, most of the peeled-off portion (35g) is the porous portion (151), which improves the noise reduction of the fan unit (30).

[0055] (6-2) Variation 2 In the present modified example 2, the installation range of the porous portion (251) is different. As shown in FIG. 8, in the present modified example 2, the porous portion (251) is located in a range that is defined by connecting the first vertex (P1) and the second vertex (P2) with a straight line, connecting the first vertex (P1) and the third vertex (P3) with a straight line, and connecting the second vertex (P2) and the third vertex (P3) with a curve. More specifically, the shape of the porous portion (251) as viewed from the direction of rotation is a quarter ellipse with the long side extending from the first vertex (P1) to the second vertex (P2) and the short side extending from the first vertex (P1) to the third vertex (P3). In the present modified example 2, the length from the leading edge (35c) to the end of the porous portion (251) on the trailing edge side is longer toward the other end (35b) of the blade (35) and is longest at the other end (35b) of the blade (35).

[0056] In the present modification 2, the area of ​​the porous portion (251) can be made as large as possible at the apex (35h) of the warp on the negative pressure side of the blade (35). This can improve the noise reduction of the fan device (30). In addition, in the present modification 2, the joints (35e, 35f) are non-porous portions (252), and therefore the strength of the blade (35) against centrifugal force can be improved.

[0057] (6-3) Variation 3 Modification 3 is different in the installation range of the porous portion (351). As shown in Fig. 9, the shape of the porous portion (351) seen from the direction of rotation is a rectangle with the long side extending from the first vertex (P1) to the second vertex (P2) and the short side extending from the first vertex (P1) to the third vertex (P3).

[0058] In the present third modification, the area of ​​the porous portion (351) can be made as large as possible at the apex (35h) of the warp on the negative pressure side of the blade (35). This can improve the noise reduction of the fan device (30). In the present third modification, the joints (35e, 35f) are non-porous portions (352), and therefore the strength of the blade (35) against centrifugal force can be improved.

[0059] (7) Other embodiments The porous portion (451) may be located in a range between the third apex (P3) and the leading edge (35c) at the other end (35b) of the blade (35). In other words, the portion between the third apex (P3) and the trailing edge (35d) at the other end (35b) of the blade (35) may be the non-porous portion (452). As shown in Fig. 10, in a range closer to the one end (35a) than the other end (35b) of the blade (35), the porous portion (451) may extend from the leading edge (35c) to a range greater than 90% of the blade chord length (L).

[0060] The joint portion (35f) between the blade (35) and the first ring (37) may be the entire other end (35b) of the blade (35) rather than a part of the other end (35b). In this case, the entire other end (35b) of the blade (35) may be made non-porous.

[0061] The portion of the fan (33) that is to be the non-porous portion (52, 152, 252, 352, 452) may be either the joint portion (35e) between the blade (35) and the plate (36) or the joint portion (35f) between the blade (35) and the first ring (37).

[0062] Although a centrifugal fan has been exemplified as the fan (33), the fan (33) may be a cross-flow fan. By employing the configuration of this embodiment in a cross-flow fan, it is possible to obtain the effect of increasing the strength of the blades (35) while improving noise reduction. In the case of a cross-flow fan, some of the multiple connected fans may have both one end (35a) and the other end (35b) of the blades (35) joined to the annular portion. In this case, for some of the multiple fans, the joint portions with the annular portion of both one end (35a) and the other end (35b) of the blades (35) may be non-porous.

[0063] The fan unit (30) may be of a horizontal type with the rotation axis (X) extending vertically, or may be arranged so that the rotation axis (X) extends in another direction.

[0064] The fan device (30) may be a single-side intake fan device in which the intake is formed only in the second wall (42).

[0065] The air conditioner (10) may be an air purifier that purifies the air in a target space, a ventilation device that ventilates the target space, or a humidity control device that adjusts the humidity in the target space.

[0066] The indoor unit (10a) may be of a ceiling-suspended type, a wall-mounted type, or a floor-standing type.

[0067] Although the embodiments and modifications have been described above, it will be understood that various modifications of form and details are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments, modifications, and other embodiments may be appropriately combined or substituted as long as the functions of the subject of the present disclosure are not impaired.

[0068] The descriptions "first," "second," "third," etc. mentioned above are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words. [Industrial Applicability]

[0069] As described above, the present disclosure is useful for fans. [Explanation of symbols]

[0070] 33 Fans 35 wings 35a one end 35b other end 35c leading edge 35d trailing edge 35e joint part 35f joint part 35g Peeling part 36 Plate 37 First ring (annular part) 51 Porous part 52 Non-porous part 151 Porous part 152 Non-porous part 251 Porous part 252 Non-porous part 351 Porous part 352 Non-porous part 451 Porous part 452 Non-porous part H Wing height L chord length P1 First vertex P2 2nd vertex P3 3rd vertex X Rotation Axis

Claims

1. A disk-shaped plate (36) that rotates around a rotation axis (X); an annular portion (37) located away from the plate (36) in the axial direction of the rotation shaft (X); a blade (35) located between the plate (36) and the annular portion (37), the blade having one end (35a) in the axial direction of the rotation shaft (X) joined to the plate (36) and the other end (35b) in the axial direction joined to the annular portion (37), the blade (35) has a porous portion (51, 151, 251, 351, 451) in a part thereof, a joint portion (35e) between the blade (35) and the plate (36), or a joint portion (35f) between the blade (35) and the annular portion (37), which is a non-porous portion (52, 152, 252, 352, 452).

2. The fan according to claim 1, The porous portion (51, 151, 251, 351, 451) is disposed at a separation portion (35g) where air flowing along the blade (35) separates.

3. The fan according to claim 1, The porous portion (51, 151, 251, 351, 451) includes a leading edge (35c) of the blade (35).

4. The fan according to claim 3, a joint portion (35e) between the blade (35) and the plate (36) is the entire one end (35a) of the blade (35), a joint portion (35f) between the blade (35) and the annular portion (37) is a trailing edge (35d) of the blade (35) and the other end (35b), a blade height (H) is a dimension from the plate (36) to the other end (35b) of the blade (35), a blade chord length (L) is a dimension from the leading edge (35c) to the trailing edge (35d) of the blade (35), and the porous portion (51, 151, 251, 351) is positioned in a range that is 90% or less of the blade height (H) and from the leading edge (35c) to 90% or less of the blade chord length (L).

5. The fan according to claim 4, a length from the leading edge (35c) to an end of the porous portion (51, 151, 251, 351) on a trailing edge (35d) side is longer on the other end (35b) side than on the one end (35a) side in a direction perpendicular to the axial direction.

6. The fan according to claim 5, a first vertex (P1) is a position of the other end (35b) and the leading edge (35c) of the blade (35), a second vertex (P2) is a position that is 90% of the blade height (H) from the first vertex (P1), and a third vertex (P3) is a position that is 90% of the blade chord length (L) from the first vertex (P1), when viewed in the direction of rotation about the rotation axis (X), and the porous portion (51, 151, 251, 351) is located in a range that is connected by a straight line or a curved line among the first vertex (P1), the second vertex (P2), and the third vertex (P3).

7. The fan according to any one of claims 1 to 6, which is a centrifugal fan.

8. An air conditioner comprising a fan (33) according to any one of claims 1 to 6.

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