Fans and air conditioners

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 conditioner.

Background Art

[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 sirocco fan has the entire blades made of a porous material such as metal, synthetic resin, or ceramic.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When the fan rotates, stress tends to concentrate on the joint portion between the blade and other components. In a structure where the entire blade is a porous part like the fan in Patent Document 1, the strength decreases at the joint portion.

[0005] The present disclosure improves the quietness while increasing the strength of the blades in a fan.

Means for Solving the Problems

[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 located axially away from the plate (36) with respect to the rotation axis (X), and a blade (35) that is located between the plate (36) and the ring portion (37), with one axial end (35a) of the rotation axis (X) joined to the plate (36) and the other axial end (35b) joined to the ring portion (37). The blade (35) has a porous portion (51) in part, and the joint portion (35e) between the blade (35) and the plate (36) or the joint portion (35f) between the blade (35) and the ring portion (37) is a non-porous portion (52).

[0007] In the first aspect, by making the joint portions (35e, 35f) where stress is likely to concentrate into non-porous portions (52), the strength of the blade (35) can be increased. Also, since part of the blade is a porous portion (51), the separation of air can be suppressed. By suppressing the separation of air, the quietness is improved. Therefore, it is possible to increase the strength of the blade (35) while improving the quietness.

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

[0009] In the second aspect, by arranging the porous portion (51) at the separation portion (35g), the separation of air is effectively suppressed. Therefore, the quietness can be improved.

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

[0011] In the third aspect, by making the leading edge (35c), which is a portion where air is likely to separate, into a porous portion (51), the separation of air is effectively suppressed. Therefore, the quietness can be improved.

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

[0013] In the fourth aspect, since the porous portion (51) is arranged as widely as possible, the quietness can be improved. Also, since a range for installing the non-porous portion (52) can be secured, the strength of the wing (35) can be improved.

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

[0015] In the fifth aspect, the installation range of the porous portion (51) becomes narrow around the joint portion between the wing (35) and the plate (36). Therefore, the strength of the wing (35) can be improved.

[0016] The sixth aspect is that in the fourth or fifth aspect, when viewed from the rotational direction around the rotation axis (X), taking the position of the other end (35b) and the leading edge (35c) of the wing (35) as the first vertex (P1), the position at 90% of the wing height (H) from the first vertex (P1) as the second vertex (P2), and the position at 90% of the wing chord length (L) from the first vertex (P1) as the third vertex (P3), 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, since the porous portion (51) is arranged in most of the leading edge, the quietness can be improved. Since the periphery of the joint portions (35e, 35f) can be made as wide as possible within the range of the non-porous portion (52), the strength of the blade (35) can be improved.

[0018] In the 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. The joint portions (35e, 35f) are likely to have stress concentration due to the centrifugal force. By making the joint portions (35e, 35f) the non-porous portion (52), the strength of the blade (35) can be ensured. Also, since a part of the blade is the porous portion (51), the separation of air can be suppressed. By suppressing the separation of air, the quietness is improved. Therefore, it is possible to improve the quietness while increasing the strength of the blade (35) against the centrifugal force.

[0020] The eighth aspect is an air conditioner including the fan described in any one of the first to seventh aspects.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

[0022] Hereinafter, 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 without departing from the technical idea of the present disclosure. Since each drawing is for conceptually explaining the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

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

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

[0025] The fan device (30) is disposed in the air passage (16). Strictly speaking, the fan device (30) is a sirocco fan device.

[0026] The indoor heat exchanger (17) exchanges heat between air and refrigerant. The indoor heat exchanger (17) is connected to the 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 the cooling operation, the compressor and the fan device (30) are operated, and the indoor heat exchanger (17) functions as an evaporator. The air flowing from the outside air intake (14) into the air passage (16) passes through the indoor heat exchanger (17). In the indoor heat exchanger (17), the air is cooled by the evaporating refrigerant. The air cooled by the indoor heat exchanger (17) is supplied to the indoor space through the air supply port (15) and the air supply duct.

[0028] During the heating operation, the compressor and the fan device (30) are operated, and the indoor heat exchanger (17) functions as a condenser (radiator). The air flowing from the outside air intake (14) into the air passage (16) passes through the indoor heat exchanger (17). In the indoor heat exchanger (17), the air is heated by the condensing refrigerant. The air heated by the indoor heat exchanger (17) is supplied to the indoor space through the air supply port (15) and the air supply duct.

[0029] (2) Overview of the Fan The fan device (30) shown in FIGS. 1 to 3 includes a motor (31), a drive shaft (32) 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 a vertically arranged 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 its rotational direction. In the case of FIG. 3, the rotational direction of the fan (33) is counterclockwise about the rotation axis (X).

[0031] The casing (40) has a cylindrical casing body (40a) and a discharge portion (40b) extending in a tangential direction of the casing body (40a) from an outer peripheral portion 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 on one end side in the axial direction of the casing body (40a), and the second wall (42) is formed on the other end side in the axial direction of the casing body (40a). The first wall (41) is located on the motor (31) side with the fan (33) interposed therebetween, and the second wall (forty-two) is located on the side opposite to the motor (31) with the fan (33) interposed therebetween. The first wall (41) and the second wall (42) are disc-shaped. A first suction port (47) is formed in a central portion of the first wall (41). A second suction port (44) is formed in a central portion of the second wall (42). The peripheral wall (43) surrounds an outer peripheral edge portion of the fan (33). The peripheral wall (43) is substantially arc-shaped along the fan (33).

[0033] The discharge portion (40b) constitutes a duct communicating with the inside of the casing body (40a). The discharge portion (40b) is formed in a rectangular cylindrical shape with both ends in its axial direction open. An opening at one end in the axial direction of the discharge portion (40b) is connected to the inside of the casing body (40a). An opening at the other end in the axial direction of the discharge portion (40b) constitutes a blowout port (45). Inside the casing (forty), a fan flow path (46) through which air flows is formed from the first suction port (47) and the second suction port (44) to the blowout port (45).

[0034] (3) Structure of the fan The fan (33) shown in Fig. 4 has a plurality of blades (35), a disc-shaped plate (36), a first ring (37) located axially away from the plate (36) with respect to the rotation axis (X), and a second ring (38) located between the plate (36) and the first ring (37) in the axial direction of the rotation axis (X). The blades (35), the first ring (37), and the second ring (38) are arranged on both sides in the axial direction of the rotation axis (X) with the plate (36) interposed therebetween.

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

[0036] The plate (36) has a boss (36a) at the center. The boss (36a) is connected to the drive shaft (32). The joining portion (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 integrally joined by integral molding or insert.

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

[0038] The second ring (38) is arranged 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 arranged 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 integrally joined by integral molding or welding.

[0039] (4) Structure of the blade The blade (35) has a porous part (51) in part. The porous part (51) has a plurality of fine holes communicating from the positive pressure surface to the negative pressure surface of the blade (35). The porous part (51) is made of resin, ceramics, metal, etc. The resin is, for example, a foamed resin. The metal and ceramics are porous sintered bodies. The average diameter of the holes (voids) of the porous part (51) is, for example, in the range of 15 μm to 300 μm. The porosity (= volume of voids / volume of the entire porous part) of the porous part (51) is, for example, in the range of 35% to 90%.

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

[0041] The porous part (51) is arranged at the separation part (35g) where the air flowing along the blade (35) separates. When the air separates at the separation part (35g), vortices are likely to occur. When vortices occur, there is a problem that the air flow is greatly disturbed and noise is generated. In the present embodiment, in order to solve the above problems, the porous part (51) is provided at the separation part (35g).

[0042] As shown in FIGS. 5 and 6, the separation part (35g) is the top (35h) of the warp on the negative pressure surface side of the leading edge (35c) and the wing (35). In the case of a sirocco fan as in this embodiment, in the process of air flowing from the inner side to the outer side in the radial direction, the air is particularly likely to separate on the negative pressure surface side of the leading edge (35c). Therefore, the porous part (51) is arranged substantially over the entire leading edge (35c). Note that the porous part (51) only needs to include a part of the separation part (35g). It is not necessary for the entire separation part (35g) to be the porous part (51).

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

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

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

[0046] (5) Effects of the embodiment In the present embodiment, the blade (35) has a porous portion (51) in part, and the joint portions (35e) between the blade (35) and the plate (36) and between the blade (35) and the first ring (37) are non-porous portions (52). By making the joint portions (35e, 35f) where stress is likely to concentrate into non-porous portions (52), the strength against centrifugal force can be increased. Further, since a part of the blade (35) is a porous portion (51), separation of air can be suppressed. By suppressing the separation of air, the quietness of the fan device (30) is improved. Therefore, it is possible to improve the strength of the blade (35) against centrifugal force and the quietness of the fan device (30).

[0047] In the present embodiment, the porous portion (51) is arranged at a separation portion (35g) where air flowing along the blade (35) separates. By arranging the porous portion (51) at the separation portion (35g), separation of air is effectively suppressed. Therefore, the quietness of the fan device (30) can be improved.

[0048] In the present embodiment, the porous portion (51) includes the leading edge (35c) of the blade (35). By making the leading edge (35c), which is a portion where air is likely to separate, into the porous portion (51), separation of air is effectively suppressed. Therefore, the quietness of the fan device (30) can be improved.

[0049] In the present embodiment, the porous portion (51) is arranged in a range that is 90% or less of the blade height (H) from the other end (35b) of the blade (35) and 90% or less of the chord length (L) from the leading edge (35c). Since the porous portion (51) is arranged as widely as possible, the quietness of the fan device (30) can be improved.

[0050] In the present embodiment, in the radial direction of the rotation axis (X), the length from the leading edge (35c) to the end on the trailing edge (35d) side of the porous portion (51) is longer on the other end (35b) side than on the one end (35a) side. The periphery of the joint portion (35e) between the blade (35) and the plate (36) has a narrower installation range of the porous portion (51). Therefore, the strength of the blade (35) against centrifugal force can be improved.

[0051] In the sixth aspect, 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. Since the porous portion (51) is arranged in most of the leading edge (35c), the quietness of the fan device (30) can be improved. The periphery of the joint portions (35e, 35f) can have as wide a non-porous portion (52) range as possible, so the strength of the blade (35) against centrifugal force can be improved.

[0052] (6) Modification The above-described fan device (30) may have the following modified configuration. Hereinafter, the points different from the above embodiment will be described.

[0053] (6-1) Modification 1 In this Modification 1, the installation range of the porous portion (151) is different. As shown in FIG. 7, the porous portion (151) is not provided in the portion on the other end (35b) side and the trailing edge (35d) side of the blade (35) within the specific range (R). The non-porous portion (152) is arranged in the corresponding portion of the specific range (R).

[0054] In the first modification example 1, in the peripheral portion of the joint portion (35f) between the blade (35) and the first ring (37), the range of the non-porous portion (152) becomes wider. Thereby, the strength of the blade (35) against centrifugal force can be improved. Further, in the first modification example 1, since most of the peeling portion (35g) is the porous portion (151), the quietness of the fan device (30) can be improved.

[0055] (6-2) Second modification example In the second modification example 2, the installation range of the porous portion (251) is different. As shown in FIG. 8, in the second modification example 2, a straight line is connected between the first vertex (P1) and the second vertex (P2), a straight line is connected between the first vertex (P1) and the third vertex (P3), and the porous portion (251) is located in the range where the second vertex (P2) and the third vertex (P3) are connected by a curve. Specifically, the shape of the porous portion (251) as viewed from the rotation direction is an oval shape having the side from the first vertex (P1) to the second vertex (P2) as the long side and the side from the first vertex (P1) to the third vertex (P3) as the short side. In the second modification example 2, the length from the leading edge (35c) to the end on the trailing edge side of the porous portion (251) is longer as the position is closer to the other end (35b) of the blade (35), and is the longest at the position of the other end (35b) of the blade (35).

[0056] In the second modification example 2, at the top (35h) of the warp on the negative pressure surface side of the blade (35), the range of the porous portion (251) can be made as wide as possible. Thereby, the quietness of the fan device (30) can be improved. Further, in the second modification example 2, since the joint portions (35e, 35f) are non-porous portions (252), the strength of the blade (35) against centrifugal force can be improved.

[0057] (6-3) Third modification example In the third modification example 3, the installation range of the porous portion (351) is different. As shown in FIG. 9, the shape of the porous portion (351) as viewed from the rotation direction is a rectangular shape having the side from the first vertex (P1) to the second vertex (P2) as the long side and the side from the first vertex (P1) to the third vertex (P3) as the short side.

[0058] In the third modification example, the range of the porous portion (351) can be made as wide as possible at the top (35h) of the warp on the negative pressure surface side of the blade (35). Thereby, the quietness of the fan device (30) can be improved. Further, in the third modification example, since the joint portions (35e, 35f) are non-porous portions (352), the strength of the blade (35) against centrifugal force can be improved.

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

[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 a non-porous portion.

[0061] The portion to be made a non-porous portion (52, 152, 252, 352, 452) in the fan (33) may be either one of 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).

[0062] Although a centrifugal fan has been exemplified as the fan (33), the fan (33) may be a cross-flow fan. By adopting the configuration of the present embodiment for the cross-flow fan, the effect of improving the quietness can be obtained while increasing the strength of the blades (35). In the case of a cross-flow fan, in some of the plurality of connected fans, both one end (35a) and the other end (35b) of the blade (35) may be joined to the annular portion. In this case, for some of the plurality of fans, both the one end (35a) and the other end (35b) of the blade (35) may have a non-porous portion at the joint portion with the annular portion.

[0063] The fan device (30) may be a horizontally placed type in which the rotation axis (X) extends in the vertical direction, or may be arranged such that the rotation axis (X) extends in another direction.

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

[0065] The air conditioner (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.

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

[0067] Although the embodiments and modified examples have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. Also, the above embodiments, modified examples, and other embodiments may be appropriately combined or replaced as long as the functions of the object of the present disclosure are not impaired.

[0068] The descriptions such as "first", "second", "third",... described above are used to distinguish the clauses to which these descriptions are given, and do not limit even the number and order of those clauses.

Industrial Applicability

[0069] As described above, the present disclosure is useful for a fan.

Description of Reference Numerals

[0070] 33 Fan 35 Blade 35a One end 35b The other end 35c Leading edge 35d Trailing edge 35e Joint portion 35f Joint portion 35g Separation 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 Blade height L Chord length P1 First vertex P2 Second vertex P3 Third vertex X Rotation axis

Claims

1. a circular plate (36) that rotates around a rotation axis (X); an annular portion (37) positioned apart from the plate (36) in the axial direction of the rotation axis (X); a blade (35) located between the plate (36) and the annular portion (37), one end (35a) of the blade in the axial direction of the rotation shaft (X) joined to the plate (36) and the other end (35b) of the blade in the axial direction joined to the annular portion (37), The blade (35) has a porous portion (51, 151, 251, 351, 451) in part thereof, a joint (35e) between the blade (35) and the plate (36) or a joint (35f) between the blade (35) and the annular portion (37) is a non-porous portion (52, 152, 252, 352, 452); the porous portion (51, 151, 251, 351, 451) includes a leading edge (35c) of the blade (35), the joint portion (35e) between the blade (35) and the plate (36) is the entire one end (35a) of the blade (35); a joint (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) of the blade (35) to the trailing edge (35d), and the porous portion (51, 151, 251, 351) is arranged in a range of 90% or less of the blade height (H) and 90% or less of the blade chord length (L) from the leading edge (35c), a length from the leading edge (35c) to an end of the porous portion (51, 151, 251, 351) on a trailing edge (35d) side in a direction perpendicular to the axial direction is longer on the other end (35b) side than on the one end (35a) side.

2. The fan according to claim 1, a fan 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, 151, 251, 351) is arranged 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).

3. a circular plate (36) that rotates around a rotation axis (X); an annular portion (37) positioned apart from the plate (36) in the axial direction of the rotation axis (X); a blade (35) located between the plate (36) and the annular portion (37), one end (35a) of the blade in the axial direction of the rotation shaft (X) joined to the plate (36) and the other end (35b) of the blade in the axial direction joined to the annular portion (37), The blade (35) has a porous portion (51, 151, 251, 351, 451) in part thereof, a joint (35f) between the blade (35) and the annular portion (37) is a non-porous portion (52, 152, 252, 352, 452), the porous portion (51, 151, 251, 351, 451) includes a leading edge (35c) of the blade (35); fan.

4. The fan according to any one of claims 1 to 3, The porous portion (51, 151, 251, 351, 451) is disposed at a separation portion (35g) where air flowing along the blade (35) separates.

5. The fan according to any one of claims 1 to 3, wherein the fan is a centrifugal fan.

6. An air conditioner comprising the fan (33) according to any one of claims 1 to 3.

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