air conditioning unit

Abstract

To provide an air conditioning device in which while a fan is fixed so as not to be displaced with respect to a rotating shaft, the fan can be easily removed from the shaft.SOLUTION: An air blowing part of an air conditioning device comprises: a motor; a shaft to be rotated and driven around an axis by the motor, and comprising an outer peripheral surface having a uniform outside diameter in the direction of the axis, and a concave part retreated inward in a radial direction from the outer peripheral surface; a fan comprising a cylindrical boss part externally fitted to the outer peripheral surface of the shaft, and provided so as to overlap with the concave part from the outside in the radial direction, a connection part protruding outward in the radial direction of the axis from the boss part, and a cylindrical blade part connected to the outside in the radial direction of the connection part, and coaxial with the boss part; and a fastening member penetrating the boss part in the radial direction, and in contact with a bottom part of the concave part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to air conditioning systems. [Background technology]

[0002] As a means for fastening the fan and the shaft, for example, Patent Document 1 discloses a structure in which the shaft is press-fitted into the fan. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-77447 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the fastening means described in Patent Document 1 requires that the dimensional difference between the inner diameter of the fan and the outer diameter of the shaft be appropriately set, making it difficult to fix the fan so that it does not shift relative to the rotating shaft while also allowing the fan to be easily removed from the shaft.

[0005] The present disclosure has been made to solve the above-mentioned problem, and aims to provide an air conditioning device that can easily remove the fan from the rotating shaft while fixing the fan so that it does not shift relative to the shaft. [Means for solving the problem]

[0006] In order to solve the above-described problems, an air conditioning device according to the present disclosure includes: a casing that forms a flow path between an intake port and an outlet port; a blower unit that is provided within the casing and blows air from the intake port toward the outlet port; and a heat exchanger that is provided within the casing between the blower unit and the outlet port, wherein the blower unit includes: a motor; a shaft that is rotationally driven about an axis by the motor and has an outer circumferential surface that has a uniform outer diameter along the axis and a recess that recedes radially inward from the outer circumferential surface; a cylindrical boss that is fitted onto the outer circumferential surface of the shaft and is provided to overlap the recess from the radially outer side; a connection portion that protrudes from the boss portion radially outward in the axis; a fan that has cylindrical blades that are connected to the radially outer side of the connection portion and are coaxial with the boss portion; and a fastening member that radially penetrates the boss portion and abuts against a bottom of the recess portion. The recessed portion has a groove shape extending over the entire circumferential direction, and a pair of recessed portions are provided at both ends of the bottom portion in the axial direction, and each recessed portion further has an inner surface extending radially outward from the bottom portion to connect the bottom portion and the outer circumferential surface, and each inner surface is provided radially inward of the inner surface of the boss portion and spaced apart from the fastening member in the axial direction. . [Effects of the Invention]

[0007] According to the air conditioner of the present disclosure, the fan can be easily removed from the rotating shaft while being fixed so as not to shift relative to the shaft. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a plan view seen from above showing a schematic configuration of an indoor unit according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an enlarged cross-sectional view of a portion IV in FIG. 3. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 10 is a cross-sectional view of a boss portion and a fastening member according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] First Embodiment (Air conditioner) An air conditioner 1 according to an embodiment of the present disclosure will be described below with reference to FIGS. The air conditioner 1 shown in Fig. 1 is a ceiling-suspended indoor unit supported on the ceiling of a room or the like. The air conditioner 1 is connected to an outdoor unit (not shown) by refrigerant piping (not shown). The air conditioner 1, together with the outdoor unit and the refrigerant piping, forms a refrigeration cycle (not shown) in which a refrigerant circulates. As shown in FIGS. 1 and 2, the air conditioner 1 includes a casing 10, a heat exchanger 20, a drain pan 21, a baffle plate 22, and a blower section 30.

[0010] (Casing) The casing 10 houses various devices and components of the air conditioner 1. The casing 10 is suspended from the ceiling. The casing 10 is formed, for example, from sheet metal such as iron. The casing 10 has a rectangular parallelepiped outer shape. The casing 10 includes an upper plate 10a, a lower plate 10b, and side plates 10c. The upper plate 10a and the lower plate 10b extend horizontally. The upper plate 10a and the lower plate 10b are formed into a rectangular shape when viewed from the top-bottom direction. Four side plates 10c are provided between the upper plate 10a and the lower plate 10b. The side plates 10c extend in the top-bottom direction. The side plates 10c connect the outer periphery of the upper plate 10a to the outer periphery of the lower plate 10b.

[0011] Hereinafter, the longitudinal direction of the upper plate 10a and the lower plate 10b of the casing 10 may be referred to as the width direction Dw of the casing 10. The direction perpendicular to the width direction Dw of the casing 10, that is, the short direction of the upper plate 10a and the lower plate 10b of the casing 10, may be referred to as the depth direction Dd of the casing 10. The direction perpendicular to the width direction Dw and the depth direction Dd of the casing 10 may be referred to as the height direction Dh of the casing 10. The height direction Dh coincides with the up-down direction. The height dimension of the casing 10 is smaller than the width dimension and depth dimension of the casing 10.

[0012] The lower plate 10b has an intake port 11 formed on one side in the depth direction Dd. The intake port 11 penetrates the lower plate 10b in the height direction Dh. Of the four side plates 10c, the side plate 10c located on the opposite side of the suction port 11 in the depth direction Dd is formed with an air outlet 12. The air outlet 12 penetrates the side plates 10c of the casing 10 in the depth direction Dd. The casing 10 forms an air flow path F between the inlet 11 and the outlet 12 .

[0013] (heat exchanger) The refrigerant circulating in the refrigeration cycle flows through the heat exchanger 20. The heat exchanger 20 functions as an evaporator during cooling operation and as a condenser during heating operation. The heat exchanger 20 is provided inside the casing 10. The heat exchanger 20 is disposed on the air outlet 12 side in the depth direction Dd. The heat exchanger 20 faces the air outlet 12 in the depth direction Dd. The heat exchanger 20 is formed in a rectangular parallelepiped shape extending in the width direction Dw. The heat exchanger 20 is disposed tilted in the depth direction Dd. Therefore, the upper end of the heat exchanger 20 is located closer to the air outlet 12 than the lower end of the heat exchanger 20. The heat exchanger 20 is fixed to the casing 10 at both ends in the width direction Dw.

[0014] The heat exchanger 20 is a fin-and-tube heat exchanger. The heat exchanger 20 has heat transfer tubes 23 and fins 24. The heat transfer tubes 23 have a plurality of straight portions 23a extending in the width direction Dw and a plurality of curved portions (not shown) connecting adjacent straight portions 23a at their ends in the width direction Dw. A refrigerant flow path is formed inside the heat transfer tubes 23. The fins 24 extend in a direction intersecting the heat transfer tubes 23 and increase the heat transfer area of ​​the heat transfer tubes 23. A plurality of fins 24 are provided lined up in the width direction Dw.

[0015] (Drain pan) The drain pan 21 is provided inside the casing 10. The drain pan 21 is disposed below the heat exchanger 20. The drain pan 21 receives drain water discharged from the heat exchanger 20 during cooling operation. The drain pan 21 is formed from, for example, a non-conductive synthetic resin or foamed resin. The drain pan 21 is a plate-shaped member that fits along the bottom plate 10b of the casing 10.

[0016] (baffle plate) The baffle plate 22 is provided at one end of the heat exchanger 20 in the width direction Dw. The baffle plate 22 shields the portion of the flow path F inside the casing 10 that is outside the heat exchanger 20 in the width direction Dw, thereby preventing the air inside the casing 10 from flowing without coming into contact with the heat exchanger 20. The baffle plate 22 is formed of an iron plate or an iron plate covered with a galvanized layer. The baffle plate 22 is formed in a strip shape along the surface of the heat exchanger 20 on the side facing the air outlet 12.

[0017] (Blower section) The blower 30 is provided within the casing 10. The blower 30 blows air from the air inlet 11 toward the air outlet 12. The blower 30 is disposed within the casing 10 on the opposite side of the heat exchanger 20 from the air outlet 12. In other words, the heat exchanger 20 is provided within the casing 10 between the air blower 30 and the air outlet 12. The blower 30 faces the air inlet 11 in the height direction Dh. The blower 30 includes a motor 50, a shaft 60, a fan casing 40, a fan 70, and a fastening member 90.

[0018] (Motor) The motor 50 is disposed in the casing 10 at a position offset to one side in the width direction Dw (the side opposite the baffle plate 22 in the width direction Dw). The motor 50 is a double-shaft motor having two rotating shafts 51 protruding outward on both sides in the width direction Dw. A shaft 60 is connected to each rotating shaft 51.

[0019] (shaft) A total of two shafts 60 are provided. Each shaft 60 is formed into a hollow cylindrical shape. Each shaft 60 is fitted onto the two rotary shafts 51 of the motor 50, respectively. The shafts 60 are driven to rotate around an axis O by the motor 50. The axis O of the shafts 60 coincides with the width direction Dw. The shafts 60 are formed of a metal such as stainless steel. Each shaft 60 extends in a direction away from the motor 50 in the width direction Dw. Of the two shafts 60, the shaft 60 extending to the other side in the width direction Dw (toward the baffle plate 22 in the width direction Dw) is longer than the shaft 60 extending to one side in the width direction Dw (opposite the baffle plate 22 in the width direction Dw). Each shaft 60 is supported at an end opposite the motor 50 in the axis O direction so as to be rotatable around the axis O. The outer peripheral surface 61 of the shaft 60 has a uniform outer diameter along the axis O direction. The shaft 60 has a recess 62 on its outer circumferential surface 61 (see FIG. 3).

[0020] Hereinafter, the radial direction relative to the axis O of the shaft 60 may be simply referred to as the "radial direction." The circumferential direction relative to the axis O of the shaft 60 may be simply referred to as the "circumferential direction."

[0021] (recess) A recess 62 is provided in each of the two shafts 60. The longer of the two shafts 60 has three recesses 62. The three recesses 62 are arranged at equal intervals in the direction of the axis O. The shorter of the two shafts 60 has one recess 62 provided in the center in the direction of the axis O.

[0022] As shown in Figures 3 to 5, the recess 62 is formed such that a portion of the outer peripheral surface 61 of the shaft 60 in the circumferential direction and the axial direction O is recessed radially inward. The recess 62 is a groove-like shape that extends over the entire circumferential direction. The portion of the shaft 60 where the recess 62 is provided is a reduced diameter portion that is smaller in diameter than the other portions of the shaft 60. When viewed from the circumferential direction, the recess 62 is formed in a U-shape that opens radially outward. A radial depth dimension L1 of the recess 62 is smaller than a width dimension L2 of the recess 62 in the axial direction O.

[0023] The recess 62 has a bottom 62a and an inner surface 62b. The bottom 62a has a uniform outer diameter along the axis O, similar to the outer peripheral surface 61 of the shaft 60. A pair of inner surfaces 62b are provided at both ends of the bottom 62a in the axis O direction. The pair of inner surfaces 62b face each other along the axis O. Each inner surface 62b extends radially outward from the end of the bottom 62a in the axis O direction. The distance between the pair of inner surfaces 62b along the axis O increases radially outward. In other words, the angle formed between the inner surface 62b and the bottom 62a is greater than 90 degrees and less than 180 degrees. The inner surface 62b connects the bottom 62a to the outer peripheral surface 61.

[0024] The inner diameter of the shaft 60 described above is, for example, 1 / 3 to 2 / 3 times the outer diameter of the outer peripheral surface 61 of the shaft 60. The outer diameter of the outer peripheral surface 61 of the shaft 60 is, for example, 14 mm to 16 mm. The radial depth dimension L1 of the recess 62 is, for example, 1.0 mm. The radial depth L1 of the recess 62 is preferably, for example, 0.3 mm or more and 0.8 mm or less, and the most preferable depth L1 is, for example, 0.5 mm.

[0025] (fan casing) As shown in FIG. 1, a total of four fan casings 40 are provided at intervals along the axis O of the shaft 60. Each fan casing 40 is provided at a position where it overlaps with a corresponding recess 62 (see FIG. 3) in the radial direction. Like the casing 10, the fan casing 40 is formed from sheet metal such as iron. A space is formed inside the fan casing 40 to house the fan 70.

[0026] A fan suction port 41 is formed on each of a pair of side portions of the fan casing 40 that face each other in the width direction Dw. A pair of the fan suction ports 41 are provided so as to face each other in the width direction Dw. Each fan suction port 41 penetrates the fan casing 40 in the width direction Dw. When viewed from the width direction Dw, the fan suction port 41 is formed in a perfect circle. A shaft 60 is inserted through the fan suction port 41. The fan suction port 41 is coaxial with the shaft 60.

[0027] A fan outlet 42 is formed in the side of the fan casing 40 facing the heat exchanger 20. The fan outlet 42 penetrates the fan casing 40 in the depth direction Dd. The fan outlet 42 faces the heat exchanger 20 in the depth direction Dd. The fan casing 40 forms an air flow path F between the fan inlet 41 and the fan outlet 42.

[0028] (fan) As shown in Figures 1 and 2, one fan 70 is provided in each fan casing 40. A total of four fans 70 are provided. The fans 70 are sirocco fans. The fans 70 are inserted into the shaft 60. The fans 70 are driven to rotate integrally with the shaft 60, generating an air flow from the air inlet 11 toward the air outlet 12. The four fans 70 are provided at intervals along the axis O of the shaft 60. Each fan 70 is provided at a position radially overlapping with a corresponding recess 62. As shown in FIG. 3, the fan 70 has a boss portion 80, a connection portion 71, and a cylindrical blade portion 72.

[0029] (Boss part) As shown in FIGS. 4 and 5 , the boss portion 80 is a cylindrical member. The boss portion 80 is fitted onto the outer peripheral surface 61 of the shaft 60. The inner diameter of the boss portion 80 is slightly larger than the outer diameter of the outer peripheral surface 61 of the shaft 60. The boss portion 80 is provided on one side in the axial direction O so as to overlap the recessed portion 62 from the radially outer side. The boss portion 80 covers the recessed portion 62 from the outer peripheral side in the axial direction O and in the circumferential direction. The boss portion 80 is formed of a metal such as aluminum. End faces 83 on both sides of the boss portion 80 in the axial direction O are located outside the recessed portion 62 in the axial direction O. Both ends of the inner surface 82 of the boss portion 80 in the axial direction are in contact with the outer peripheral surface 61 of the shaft 60. A through hole 84 penetrating radially is formed on one side of the boss portion 80 in the axial direction O. A thread groove (not shown) is formed on the inner peripheral surface of the through hole 84. The through-hole 84 is formed in a perfect circular shape when viewed in the radial direction.

[0030] (Connection) As shown in Fig. 3, the connecting portion 71 protrudes radially outward from the outer surface 81 of the boss portion 80. The connecting portion 71 is provided on the opposite side of the through-hole 84 in the direction of the axis O. The connecting portion 71 is a disk-shaped member that is coaxial with the boss portion 80. The connecting portion 71 is fixed to the boss portion 80 using a fixing member (not shown). The connecting portion 71 is formed of a metal such as aluminum.

[0031] (Cylindrical blade part) The cylindrical blade portion 72 is connected to the radially outer side of the connecting portion 71. The cylindrical blade portion 72 is coaxial with the boss portion 80 and is formed of a metal such as aluminum. The cylindrical blade portion 72 has blades 72a and a ring 73. A plurality of blades 72a are arranged at equal intervals in the circumferential direction. Each blade 72a extends in the direction of the axis O. The blades 72a are arranged to penetrate the outer periphery of the connecting portion 71 in the direction of the axis O. The blades 72a are joined to the connecting portion 71 at the center in the direction of the axis O, for example, by welding. One ring 73 is provided on each of the plurality of blades 72a on both outer sides in the direction of the axis O. The ring 73 connects the plurality of blades 72a arranged in the circumferential direction. The ring 73 is joined to the blades 72a, for example, by welding.

[0032] (Fastening member) As shown in FIG. 4 , the fastening member 90 is a cylindrical set screw. The fastening member 90 is inserted into the through-hole 84 of the boss portion 80. In other words, the fastening member 90 is provided so as to penetrate the boss portion 80. The fastening member 90 is formed of a metal such as stainless steel. The fastening member 90 has a thread 90a on its outer circumferential surface. The thread 90a of the fastening member 90 is threadedly engaged with the thread groove of the through-hole 84.

[0033] A tip portion 91 of the fastening member 90 facing the shaft 60 abuts against the bottom portion 62a of the recess 62. The diameter of the tip portion 91 decreases as it approaches the bottom portion 62a. The tip portion 91 is embedded in the bottom portion 62a. A tip surface 92 of the tip portion 91 that is located closest to the shaft 60 is flat.

[0034] (Fastening procedure) The procedure for fastening the fan 70 and the shaft 60 with the fastening member 90 will be described in detail below with reference to FIG. First, the boss 80 is inserted onto the shaft 60. Next, the position of the fan 70 in the direction of the axis O is adjusted so that the boss 80 covers the recess 62 from the radially outer side. Next, the fastening member 90 is screwed into the through-hole 84 of the boss 80, and the threads 90a of the fastening member 90 are engaged with the thread grooves (not shown) of the through-hole 84. When the tip 91 of the fastening member 90 is brought into contact with the bottom 62a of the recess 62, a frictional force is generated between the tip 91 of the fastening member 90 and the bottom 62a of the recess 62. This prevents the fastening member 90 from rotating about the axis O relative to the shaft 60. The boss 80 is screwed into the fastening member 90. Therefore, the frictional force between the fastening member 90 and the shaft 60 prevents the fan 70 from rotating about the axis O relative to the shaft 60.

[0035] If the fan 70 shifts relative to the shaft 60 when the shaft 60 is rotated, the fastening member 90 is screwed deeper into the through-hole 84 of the boss portion 80 to increase the load on the shaft 60 by the fastening member 90. This increases the frictional force between the fastening member 90 and the shaft 60, making it possible to further suppress rotation of the fan 70 about the axis O relative to the shaft 60. The fastening member 90 is screwed in until a frictional force is generated that is sufficient to prevent the fan 70 from moving relative to the rotating shaft 60. In this way, the fastening of the fan 70 to the shaft 60 is completed.

[0036] (Action and effect) In this embodiment, the shaft 60 has a recess 62 that recesses radially inward from the outer circumferential surface 61. The boss 80 is fitted onto the outer circumferential surface 61 of the shaft 60 and is provided so as to overlap the recess 62 from the radially outer side. The fastening member 90 penetrates the boss 80 radially and abuts against the bottom 62a of the recess 62.

[0037] The fan 70 can be fastened to the shaft 60 by the fastening member 90. This makes it possible to fix the fan 70 to the rotating shaft 60 so that it does not shift. Furthermore, the fastening between the boss portion 80 and the shaft 60 can be released simply by removing the fastening member 90. Therefore, the fan 70 can be easily pulled out from the shaft 60.

[0038] Furthermore, if the load applied to the shaft 60 by the fastening member 90 exceeds a certain value, the tip 91 of the fastening member 90 may scrape the shaft 60, resulting in the generation of a burr B. In this embodiment, even if a burr B is generated, the burr B can be contained within the recess 62, thereby preventing the burr B from protruding radially outward from the outer circumferential surface 61 of the shaft 60. In other words, the thickness of the burr B can be absorbed, preventing the outer diameter of the outer circumferential surface 61 of the shaft 60 from increasing. This prevents the burr B from getting caught on the fan 70 when the fan 70 is removed from the shaft 60. Therefore, even if a burr B is generated during fastening with the fastening member 90, the fan 70 can be easily removed from the shaft 60.

[0039] In this embodiment, the boss portion 80 covers the recessed portion 62 from the outer circumferential side in the axis O direction and the circumferential direction. Boss portion 80 can prevent burrs B from scattering outward in the direction of axis O from recess 62. It can also further prevent burrs B from getting caught on fan 70 when fan 70 is pulled out from shaft 60. Therefore, even if burrs B are generated when fastening fan 70 with fastening member 90, fan 70 can be pulled out from shaft 60 more easily.

[0040] In addition, the boss portion 80 is attached to the shaft 60 with both ends of the boss portion 80 in the direction of the axis O in contact with the outer circumferential surface 61 of the shaft 60. of As a result, the boss portion 80 is supported on both sides in the direction of the axis O, and the fan 70 can be stably attached to the shaft 60. Therefore, compared to when the boss portion 80 is supported on one side in the direction of the axis O, it is possible to suppress an increase in vibrations caused by the rotation of the fan 70.

[0041] In this embodiment, the recess 62 is in the form of a groove extending over the entire circumferential direction. As a result, the recess 62 can be provided simply by forming a groove extending over the entire circumferential direction on a portion of the outer circumferential surface 61 of the shaft 60 in the direction of the axis O. Therefore, the manufacturing process of the air conditioner 1 can be simplified.

[0042] In this embodiment, the tip 91 of the fastening member 90 is embedded in the bottom portion 62a. This increases the fastening force of the fastening members, thereby more firmly fixing the fan 70 to the rotating shaft 60 so that it does not shift.

[0043] In this embodiment, the radial depth dimension L1 of the recess 62 is preferably, for example, 0.3 mm or more and 0.8 mm or less. In this case, the burr B can be effectively prevented from protruding radially outward beyond the outer circumferential surface 61 of the shaft 60. It is also considered that the depth L1 is most preferably 0.5 mm, for example. In this case, the strength of the shaft 60 can be ensured while more effectively preventing the burr B from protruding radially outward from the outer circumferential surface 61 of the shaft 60.

[0044] Second Embodiment An air conditioner 101 according to a second embodiment of the present disclosure will be described below with reference to Fig. 6. In the second embodiment, the same components as those in the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted as appropriate.

[0045] (recess) 6, the recess 65 is a cutout portion formed by cutting out a portion of the outer circumferential surface 61 of the shaft 160. A bottom portion 66 of the recess 65 has a flat shape extending along the axis O direction and the radial direction.

[0046] (Action and effect) In this embodiment, the bottom 66 of the recess 65 is flat. The bottom 66 of the recess 65 can prevent the fastening member 90 from moving in the circumferential direction, thereby preventing the fan 70 from rotating relative to the shaft 160. Therefore, the fan 70 can be more firmly fixed to the rotating shaft 160 so as not to shift.

[0047] (Other embodiments) The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure. In the above embodiment, the air conditioners 1, 101 are indoor units, but this is not limiting, and the air conditioners 1, 101 may be outdoor units, for example.

[0048] In the above embodiment, the shafts 60, 160 are formed in a cylindrical shape with a hollow interior, but this is not limited thereto. The shafts 60, 160 may be formed in a cylindrical shape with a solid interior. When the shafts 60, 160 are hollow, there is a limit to the depth dimension L1 of the recesses 62, 65 in order to ensure the strength of the shafts 60, 160. On the other hand, when the shafts 60, 160 are not hollow, and In comparison, it is possible to increase the depth L1 of the recesses 62, 65. This makes it possible to more effectively prevent the burrs B from protruding radially outward beyond the outer circumferential surface 61 of the shafts 60, 160.

[0049] In the above embodiment, the fan 70 is a sirocco fan, but the present invention is not limited to this and the fan 70 may be, for example, a turbo fan.

[0050] In the above embodiment, the air conditioner 1 is provided with four fans 70, but this is not limited to this. The number of fans 70 can be changed as appropriate. The arrangement of the fans 70 relative to the motor 50 can also be changed as appropriate. For example, one fan 70 may be provided on each side of the motor 50 in the direction of the axis O. Alternatively, two fans 70 may be provided on each side of the motor 50 in the direction of the axis O.

[0051] In the above embodiment, the boss portion 80 is formed in a cylindrical shape, but this is not limited thereto. The boss portion 80 may be formed in any shape as long as it is formed in a cylindrical shape. For example, the inner peripheral surface of the boss portion 80 may be formed in a perfect circular shape when viewed from the direction of the axis O, and the outer peripheral surface 61 of the boss portion 80 may be formed in a polygonal shape when viewed from the direction of the axis O.

[0052] In the above embodiment, the connecting portion 71 is a disk-shaped member, but this is not limited thereto. The connecting portion 71 may be any member that protrudes radially outward from the boss portion 80. For example, the connecting portion 71 may be provided only in a partial region in the circumferential direction of the outer surface 81 of the boss portion 80. However, if the connecting portion 71 is provided over the entire circumferential area of ​​the outer surface 81 of the boss portion 80, this is advantageous in that it can prevent the weight balance of the entire fan 70 from becoming unbalanced in the circumferential direction, thereby stabilizing the rotation of the fan 70.

[0053] Although the boss portion 80 has been described as being made of a metal such as aluminum, the material is not limited to this and may be made of, for example, a synthetic resin.

[0054] Although the connecting portion 71 and the cylindrical blade portion 72 are described as being made of a metal such as aluminum, the present invention is not limited to this and they may be made of a synthetic resin, for example. In this case, the connecting portion 71 and the cylindrical blade portion 72 are integrally formed by resin molding using a mold.

[0055] In the above embodiment, the tip surface 92 of the tip portion 91 of the fastening member 90, which is located closest to the shaft 60, 160, is flat, but this is not limited to this. The fastening member 90 may be a so-called pointed bolt having a sharp tip portion 91.

[0056] <Additional Notes> The air conditioners 1 and 101 described in the respective embodiments can be understood, for example, as follows.

[0057] (1) An air conditioner 1,101 according to a first aspect includes a casing 10 that forms a flow path F between an intake port 11 and an outlet port 12, a blower unit 30 that is provided in the casing 10 and blows air from the intake port 11 toward the outlet port 12, and a heat exchanger 20 that is provided in the casing 10 between the blower unit 30 and the outlet port 12. The blower unit 30 includes a motor 50, an outer peripheral surface 61 that is driven to rotate around an axis O by the motor 50, and has a uniform outer diameter along the axis O, and a heat exchanger 20 that is driven to rotate around the outer peripheral surface 61. a cylindrical boss portion 80 fitted onto the outer peripheral surface 61 of the shaft 60, 160 and arranged to overlap the recesses 62, 65 from the radially outer side; a connecting portion 71 extending from the boss portion 80 radially outward from the axis O; and a cylindrical blade portion 72 connected to the radially outer side of the connecting portion 71 and coaxial with the boss portion 80; and a fastening member 90 radially penetrating the boss portion 80 and abutting against the bottoms 62a, 66 of the recesses 62, 65.

[0058] The fastening member 90 allows the fan 70 to be fastened to the shaft 60, 160. Furthermore, simply removing the fastening member 90 allows the boss portion 80 and the shaft 60, 160 to be released from the fastening. Even if the tip portion 91 of the fastening member 90 scrapes the shaft 60, 160, generating a burr B, the burr B can be contained within the recesses 62, 65, preventing the burr B from protruding radially outward beyond the outer circumferential surface 61 of the shaft 60, 160. Therefore, the burr B can be prevented from getting caught on the fan 70 when the fan 70 is pulled out from the shaft 60, 160.

[0059] (2) The air conditioner 1, 101 of a second aspect is the air conditioner 1, 101 of (1), wherein the boss portion 80 may cover the recessed portions 62, 65 from the outer periphery side in the direction of the axis O and in the circumferential direction.

[0060] The boss portion 80 can prevent the burrs B from scattering outward in the axis O direction from the recesses 62, 65.

[0061] (3) The air conditioner 1 of a third aspect is the air conditioner 1 of (1) or (2), and the recess 62 may be a groove extending over the entire circumferential direction.

[0062] As a result, the recess 62 can be provided simply by forming a part of the outer circumferential surface 61 of the shaft 60 in the direction of the axis O into a groove shape that extends over the entire circumferential direction.

[0063] (4) The air conditioner 101 of a fourth aspect is the air conditioner 101 of (1) or (2), and the bottom 66 of the recess 65 may be flat.

[0064] The bottom 66 of the recess 65 can prevent the fastening member 90 from moving in the circumferential direction, thereby preventing the fan 70 from rotating relative to the shaft 160. [Explanation of symbols]

[0065] 1...air conditioning device 10...casing 10a...upper plate 10b...lower plate 10c...side plate 11...intake port 12...outlet 20...heat exchanger 21...drain pan 22...baffle plate 23...heat transfer tube 23a...straight section 24...fin 30...blower section 40...fan casing 41...fan inlet 42...fan outlet 50...motor 51...rotating shaft 60...shaft 61...outer surface 62...recess 62a...bottom 62b...inner surface 65...recess 66...bottom 70...fan 71...connection section 72...cylindrical blade section 72a...blade 73...ring 80...boss section 81...outer surface 82...inner surface 83...end surface 84...through hole 90...fastening member 90a...thread 91...tip 92...Tip surface 101...Air conditioning unit 160...Shaft B...Burring Dd...Depth direction Dw...Width direction Dh...Height direction F...Flow path L1...Depth dimension L2...Width dimension O...Axis

Claims

1. a casing that forms a flow path between the suction port and the outlet; a blower provided in the casing and configured to blow air from the air inlet toward the air outlet; a heat exchanger provided between the blower and the outlet in the casing, The blower unit is A motor; a shaft that is driven to rotate about its axis by the motor, and that has an outer circumferential surface that has a uniform outer diameter along the axial direction, and a recess that recedes radially inward from the outer circumferential surface; a fan including a cylindrical boss portion fitted onto the outer peripheral surface of the shaft and overlapping the recess from the radially outer side, a connection portion extending from the boss portion radially outward of the axis, and a cylindrical blade portion connected to the radially outer side of the connection portion and coaxial with the boss portion; a fastening member that penetrates the boss portion in the radial direction and abuts against a bottom portion of the recessed portion; Equipped with The recessed portion has a groove shape extending over the entire circumferential direction, the recessed portions are provided at both ends of the bottom portion in the axial direction, and further have inner surfaces extending radially outward from the bottom portion to connect the bottom portion and the outer circumferential surface, The air conditioning device, wherein each of the inner surfaces is located radially inward of the inner surface of the boss portion and spaced apart from the fastening member in the axial direction.

2. The air conditioner according to claim 1 , wherein the boss portion covers the recessed portion from an outer circumferential side in both the axial direction and the circumferential direction.

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