Air supply device

Abstract

Provided is an air blowing device capable of blowing air having a large volume and speed. The blower device is provided with: a fan that rotates in one direction in the circumferential direction and blows air to the front side in the axial direction; and a grille that is disposed further toward the rear side in the axial direction than the fan and that is provided with a plurality of ribs that are arranged in the circumferential direction and have a spiral shape that is wound in the other direction in the circumferential direction.

Description

Technical Field

[0001] The present disclosure relates to an air supply device. Background Art

[0002] Invention Patent Gazette No. 6363811 discloses a circulator. In the circulator, the fins of the grille of the front cover have a spiral shape, and the fins of the grille of the rear cover have a radial shape (paragraphs 0001, 0017, 0023 and Figure 1 ). Summary of the invention

[0003] In the circulator disclosed in Patent Document 1, a large pressure loss occurs in the grille included in the rear cover.

[0004] Therefore, there are cases where the air volume and wind speed of the air sent by the circulator cannot be increased.

[0005] One aspect of the present disclosure is made in view of the above problems. One aspect of the present disclosure is, for example, to provide an air supply device capable of delivering wind with a large air volume and wind speed.

[0006] One embodiment of the air supply device disclosed herein comprises: a fan that rotates in one circumferential direction to supply air toward the front side in the axial direction; and a grille that is arranged at a position closer to the rear side in the axial direction than the fan and has a plurality of ribs arranged in the circumferential direction and having a spiral shape that is wound in another circumferential direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a perspective view schematically showing the air blowing device according to the first embodiment when viewed from the upper left front. Figure 2 It is a perspective view schematically showing a state of the air blowing device according to the first embodiment as viewed from the upper right rear side. Figure 3 It is an exploded perspective view schematically showing a main body included in the air blowing device according to the first embodiment, as viewed from the upper left rear. Figure 4 It is a cross-sectional view schematically showing a cross section including the central axis of a main body provided in the air blowing device according to the first embodiment. Figure 5 It is a perspective view schematically showing a main body of the air blowing device according to the first embodiment, as viewed from the upper left rear. Figure 6 It is a rear view schematically showing a rear cover and a fan included in the air blowing device according to the first embodiment. Figure 7It is a cross-sectional view schematically showing a cross section perpendicular to the central axis of the rear side cover included in the air blowing device according to the first embodiment. Figure 8 It is a rear view schematically showing the front side cover provided in the air blowing device according to the first embodiment. Fig. 9 It is a front view schematically showing the rear grille and the ion generator included in the air blowing device according to the first embodiment. Fig.10 This is an exploded perspective view schematically showing a base, a first arm, and a second arm included in the air blowing device according to the first embodiment, as viewed from the upper left front. Fig.11 This is an exploded perspective view schematically showing a base, a first arm, and a second arm included in the air blowing device according to the first embodiment, as viewed from the upper right front. DETAILED DESCRIPTION

[0008] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In addition, in the accompanying drawings, the same or equivalent elements are denoted by the same reference numerals, and repeated descriptions are omitted.

[0009] [First embodiment] 1.1 Air supply device Figure 1 It is a perspective view schematically showing a state of the air blowing device according to the first embodiment as viewed from the upper left front. Figure 2 It is a perspective view schematically showing a state of the air blowing device according to the first embodiment as viewed from the upper right rear side.

[0010] Figure 1 and Figure 2 The air supply device 1 of the first embodiment shown is a circulator that sends air with high straightness. The air supply device 1 may be an air supply device other than a circulator. For example, the air supply device 1 may be an electric fan, an air supply device built into an air conditioner, or the like.

[0011] like Figure 1 and Figure 2 As shown, the air supply device 1 includes a body 11 , a base 12 , a first arm 13 , a second arm 14 and a remote controller 15 .

[0012] The main body 11 supplies air. The main body 11 has an air inlet 11a and an air outlet 11b. The main body 11 inhales air from the air inlet 11a and blows the inhaled air out from the air outlet 11b, thereby supplying air. The main body 11 has a cylindrical shape. The main body 11 may also have a shape other than the cylindrical shape. The air inlet 11a is formed across the bottom of the rear side of the main body 11 and the end of the rear side of the side wall of the main body 11. The air outlet 11b is formed at the bottom of the front side of the main body 11.

[0013] The base 12 supports the first arm 13, the second arm 14, and the remote controller 15. The base 12 has a cylindrical shape. The base 12 may have a shape other than the cylindrical shape. The base 12 has a lower surface. The base 12 is placed on the installation surface in a state where the lower surface contacts the installation surface.

[0014] The first arm 13 and the second arm 14 are supported by the base 12, and support the main body 11. Thus, the base 12, the first arm 13, and the second arm 14 constitute a frame that supports the main body 11.

[0015] The first arm 13 and the second arm 14 have a rod-like shape.

[0016] like Figure 1 and Figure 2 As shown, the first arm 13 includes a lower end 31 and an upper end 32. The second arm 14 includes a lower end 41 and an upper end 42. The lower end 31 and the lower end 41 are connected to the base 12. The upper end 32 and the upper end 42 are connected to the body 11. Thus, the first arm 13 and the second arm 14 support the body 11 in a state where the body 11 is separated upward from the base 12.

[0017] The base 12 has a width direction DW1. The width direction DW1 is a radial direction of the base 12. The body 11 has a width direction DW2. The width direction DW2 is a radial direction of the body 11. The width direction DW2 of the body 11 is parallel to the width direction DW1 of the base 12. The lower end 31 and the lower end 41 are separated from each other in the width direction DW1 of the base 12. The upper end 32 and the upper end 42 are separated from each other in the width direction DW2 of the body 11. Thus, the upper end 32 and the upper end 42 hold the body 11 from the width direction DW2.

[0018] The upper end portion 32 and the upper end portion 42 axially support the main body 11. Thus, the upper end portion 32 and the upper end portion 42 support the main body 11 so that the main body 11 can be tilted.

[0019] The remote controller 15 receives the operation and transmits a signal corresponding to the received operation to the main body 11. The main body 11 receives the transmitted signal and performs an operation corresponding to the received signal.

[0020] The remote controller 15 is placed on the base 12 and can be picked up from the base 12 .

[0021] 1.2 Subject Figure 3 This is an exploded perspective view schematically showing a state of a main body included in the air blowing device according to the first embodiment, as viewed from the upper left rear. Figure 4 It is a cross-sectional view schematically showing a cross section including the central axis of a main body provided in the air blowing device according to the first embodiment.

[0022] like Figures 1 to 4 As shown, the main body 11 includes an air supply unit 51 , a rear cover 52 , and a front cover 53 .

[0023] The air supply unit 51 blows air. The air supply unit 51 sucks air from a space on the rear side of the air supply unit 51 and blows the sucked air to a space on the front side of the air supply unit 51, thereby blowing air.

[0024] like Figure 3 and Figure 4 As shown, the air blowing unit 51 includes a fan 61 , a motor 62 , an ion generator 63 , a housing component 64 , and a support member 65 .

[0025] The fan 61 has a central axis 61a, and has a circumferential direction DC, a radial direction DR, and an axial direction DA. The fan 61 rotates in one direction DC1 of the circumferential direction DC about the central axis 61a to send air to the front side of the axial direction DA.

[0026] The motor 62 axially supports the fan 61 so as to be rotatable about the central axis 61 a , and rotates the axially supported fan 61 in one direction DC1 of the circumferential direction DC.

[0027] Figure 5 It is a perspective view schematically showing a state of a main body included in the air blowing device according to the first embodiment, as viewed from the upper left rear.

[0028] When the fan 61 rotates in one direction DC1 along the circumferential direction DC, as shown in FIG. Figure 5 As shown by arrow A, the air in the space behind the fan 61 is sucked by the fan 61 while rotating in the opposite direction of one direction DC1 of the circumferential direction DC, that is, in the other direction DC2 of the circumferential direction DC. Therefore, the air flow generated by the air sucked by the fan 61 and passing through the rear cover 52 is a swirling flow that swirls in the other direction DC2 of the circumferential direction DC.

[0029] return Figure 3 and Figure 4 Continue with the explanation.

[0030] The ion generator 63 generates ions. The ion generator 63 is arranged on the rear side of the axial direction DA of the fan 61, and is arranged at a position offset from the central axis 61a. Thus, the ion generator 63 is arranged in the airflow generated by the air sucked in by the fan 61. Thus, the ion generator 63 generates ions in the air sucked in by the fan 61. Thus, the air supply device 1 supplies air containing ions.

[0031] The housing component 64, the rear cover 52 and the front cover 53 constitute a housing 71. The housing 71 accommodates the fan 61, the motor 62, the ion generator 63 and the support member 65. The housing component 64 has a cylindrical shape and is coaxial with the fan 61 and the motor 62.

[0032] The housing component 64 has an inner peripheral surface 64a. The support component 65 is connected to the inner peripheral surface 64a. The support component 65 supports the motor 62. The motor 62 supports the ion generator 63. Thus, the housing component 64 supports the motor 62 via the support component 65 when the housing 71 accommodates the motor 62. In addition, the housing component 64 supports the ion generator 63 via the support component 65 and the motor 62 when the housing 71 accommodates the ion generator 63.

[0033] The rear cover 52 covers the rear side of the air supply unit 51. The rear cover 52 allows air sucked by the air supply unit 51 to pass through. The rear cover 52 prevents fingers of a user from entering the air supply unit 51 from the rear side. The rear cover 52 is connected to the rear end of the housing component 64.

[0034] The front cover 53 covers the front side of the air supply unit 51. The front cover 53 allows air blown from the air supply unit 51 to pass through. The front cover 53 prevents fingers of a user from entering the air supply unit 51 from the front side of the air supply unit 51. The front cover 53 is connected to the front end of the housing component 64.

[0035] 1.3 Rear side cover Figure 6 It is a rear view schematically showing the rear cover and the fan included in the air blowing device according to the first embodiment.

[0036] like Figures 1 to 4 as well as Figure 6 As shown, the rear cover 52 includes a rear grille 81. The rear grille 81 includes a bottom portion 91 and a side portion 92.

[0037] The bottom portion 91 constitutes the bottom portion of the rear side of the body 11. The bottom portion 91 has a perforated circular plate shape. The center portion of the bottom portion 91 overlaps with the fan 61 when viewed from behind. The edge portion of the bottom portion 91 does not overlap with the fan 61 when viewed from behind. The bottom portion 91 is arranged at a position further back than the fan 61 in the axial direction DA.

[0038] The side portion 92 constitutes the rear portion of the side wall of the body 11. The side portion 92 has a cylindrical shape with a hole. The side portion 92 extends from the edge of the bottom 91 to the front side in the axial direction DA. The side portion 92 extends from the edge of the bottom 91 that does not overlap with the fan 61 in a rear view to the axial direction DA, and therefore does not overlap with the fan 61 in a rear view. The side portion 92 is arranged at a position closer to the outside of the fan 61 in the radial direction DR.

[0039] 1.1 Bottom of the rear grille like Figure 6 As shown, the bottom portion 91 includes a plate-like structure 101, a first annular bone 102, a second annular bone 103, and a plurality of bones 104. The bottom portion 91 is formed with an opening 91a.

[0040] The plate-like structure 101, the first annular bone 102, the second annular bone 103, and the plurality of bones 104 are arranged at a position further back in the axial direction DA than the fan 61. The opening 91a of the bottom 91 is arranged at a position further back in the axial direction DA than the fan 61. The opening 91a allows the airflow generated by the air sucked in by the fan 61 and passing through the rear cover 52 to pass therethrough.

[0041] The plate-like structure 101 is arranged at the center of the radial direction DR. The plate-like structure 101 has a circular plate shape. The plate-like structure 101 may also have a plate-like shape other than a circular plate shape. Figure 4 As shown, the plate-like structure 101 has a first main surface 101a and a second main surface 101b. The first main surface 104a and the second main surface 101b are located on opposite sides. The first main surface 104a and the second main surface 101b face the front side and the rear side of the axial direction DA, respectively. The plate-like structure 101 is curved. The first main surface 104a is a convex surface. The second main surface 101b is a concave surface.

[0042] return Figure 6 Continue with the explanation.

[0043] The first annular bone 102 is arranged on the outer side in the radial direction DR than the plate-like structure 101. The first annular bone 102 has an annular shape.

[0044] The second annular bone 103 is arranged on the outer side in the radial direction DR than the first annular bone 102. The second annular bone 103 has an annular shape.

[0045] The multiple bones 104 are arranged along the circumferential direction DC. The multiple bones 104 have a spiral shape winding in the other direction DC2 of the circumferential direction DC. Therefore, each bone 104 included in the multiple bones 104 bends in the one direction DC1 of the circumferential direction DC as it goes outward in the radial direction DR.

[0046] The airflow passing through the multiple bones 104 is a swirling flow that swirls in the other direction DC2 of the circumferential direction DC. By setting the shape of the multiple bones 104 through which the swirling flow swirls in the other direction DC2 of the circumferential direction DC is set to a vortex shape that winds in the other direction DC2 of the circumferential direction DC, the pressure loss generated in the rear grille 81 can be reduced. Therefore, it is possible to provide an air supply device 1 with a large air volume and wind speed.

[0047] In the prototype of the air supply device 1 having a plurality of ribs having a spiral shape winding in one direction DC1 in the circumferential direction DC, the air volume was 18.24m3 / min, and the wind speed in the center was 4.89m / s. In contrast, in the prototype of the air supply device 1 having a plurality of ribs 104 having a spiral shape winding in the other direction DC2 of the circumferential direction DC, the air volume was 22.45m 3 / min, and the wind speed in the central part is 5.56m / s.

[0048] The curling of the multiple bones 104 from the circumferential direction DC to the other direction DC2 is relaxed so that the airflow passing through the multiple bones 104 does not become a vortex airflow. As a result, the ions generated by the ion generator 63 can be distributed in a well-balanced manner. In addition, the curling is relaxed so that the opening area of ​​the rear grille 81 does not become too small.

[0049] Each bone 104 has a plate-like shape. Each bone 104 has a first main surface 104a and a second main surface 104b. The first main surface 104a and the second main surface 104b are located on opposite sides. The first main surface 104a and the second main surface 104b are parallel to the axial direction DA. Therefore, each bone 104 functions as an airflow guide plate for guiding airflow.

[0050] The plurality of bones 104 include a first bone 111 and a second bone 112 .

[0051] The inner end of the first bone 111 is connected to the plate-like structure 101. The middle portion of the first bone 111 is connected to the first annular bone 102. The outer end of the first bone 111 is connected to the second annular bone 103. Thus, the first bone 111 extends from the first radial position where the plate-like structure 101 is arranged to the outer side of the radial direction DR, and reaches the radial position where the second annular bone 103 is arranged via the radial position where the first annular bone 102 is arranged.

[0052] The inner end of the second bone 112 is arranged between the plate-like structure 101 and the first annular bone 102. The middle portion of the second bone 112 is connected to the first annular bone 102. The outer end of the second bone 112 is connected to the second annular bone 103. Thus, the second bone 112 extends outward in the radial direction DR from a second radial position between the first radial position where the plate-like structure 101 is arranged and the radial position where the first annular bone 102 is arranged, and reaches the radial position where the second annular bone 103 is arranged via the radial position where the first annular bone 102 is arranged.

[0053] In this way, by extending the first bone 111 from the first radial position to the outside of the radial direction DR, and the second bone 112 from the second radial position that is closer to the outside of the radial direction DR than the first radial position to the outside of the radial direction DR, the number of bones 104 existing on the inner side of the radial direction DR where the circumferentially adjacent bones 104 are close to each other can be reduced, and the number of bones 104 existing on the outer side of the radial direction DR where the circumferentially adjacent bones 104 are far from each other can be increased. Thus, it is possible to take into account both reducing the size of each of the plurality of openings 91a formed in the bottom 91 and increasing the opening area of ​​the bottom 91. Thus, it is possible to take into account both preventing the user's fingers and the like from entering through the plurality of openings 91a and reducing the pressure loss generated in the rear grille 81.

[0054] The inner end of the second bone 112 is arranged between the plate-like structure 101 and the first annular bone 102. Therefore, the second bone 112 protrudes from the first annular bone 102 to the inner side of the radial direction DR. Thus, the second bone 112 can be arranged at the edge of the area closer to the inner side of the radial direction DR than the first annular bone 102, and the second bone 112 is not arranged in the center of the area. Thus, the second bone 112 can be arranged at the edge of the area where the adjacent first bones 111 in the circumferential direction DC are far away from each other, and the second bone 112 can be not arranged in the center of the area where the adjacent first bones 111 in the circumferential direction DC are close to each other. Thus, it is possible to take into account both reducing the size of each of the multiple openings 91a formed in the area and increasing the opening area of ​​the area. Thus, it is possible to take into account both preventing the user's fingers from intruding from the multiple openings 91a and reducing the pressure loss generated in the area. The length of the second bone 112 protruding from the first annular bone 102 is reduced so that the opening area of ​​the area is large enough.

[0055] 1.2 Side of the rear grille Figure 7 This is a cross-sectional view schematically showing a cross section perpendicular to the central axis of the rear side cover included in the air blowing device according to the first embodiment.

[0056] like Figure 6 and Figure 7 As shown, the side portion 92 includes an annular structure 121 and a plurality of side bones 122. The side portion 92 is formed with an opening 92a.

[0057] The annular structure 121 and the plurality of side ribs 122 are arranged outside the fan 61 in the radial direction DR. The opening 92a of the side portion 92 is arranged outside the fan 61 in the radial direction DR. The opening 92a allows airflow generated by air sucked by the fan 61 and passing through the rear cover 52 to pass therethrough.

[0058] The ring structure 121 has a ring shape. The ring structure 121 has a diameter that matches the diameter of the rear end of the housing component 64. The ring structure 121 is connected to the rear end of the housing component 64.

[0059] The plurality of side bones 122 are arranged along the circumferential direction DC. The front ends of the plurality of side bones 122 are connected to the annular structure 121. The rear ends of the plurality of side bones 122 are connected to the second annular bone 103. The plurality of side bones 122 are connected to the plurality of bones 104, respectively.

[0060] Each side bone 122 included in the plurality of side bones 122 has a plate-like shape. Each side bone 122 has a first main surface 122a and a second main surface 122b. The first main surface 122a and the second main surface 122b are located on opposite sides to each other. The first main surface 122a faces a direction that is inclined from another direction DC2 of the circumferential direction DC to the outside of the radial direction DR. The second main surface 122b faces a direction that is inclined from one direction DC1 of the circumferential direction DC to the inside of the radial direction DR.

[0061] The airflow passing through the plurality of side bones 122 is a swirling flow swirling in the other direction DC2 of the circumferential direction DC. By making the first main surface 122a of each side bone 122 tilted toward the outside of the radial direction DR from the other direction DC2 of the circumferential direction DC, and the second main surface 122b of each side bone 122 tilted toward the inside of the radial direction DR from the one direction DC1 of the circumferential direction DC, the pressure loss generated in the side portion 92 can be reduced. Therefore, it is possible to provide an air supply device 1 with a large air volume and wind speed.

[0062] 1.3 Front side cover like Figures 1 to 4 As shown, the front cover 53 includes a front grille 131 and a cylindrical structure 132 .

[0063] The front grille 131 forms the bottom of the front side of the body 11. The front grille 131 has a perforated circular plate shape. The center of the front grille 131 overlaps with the fan 61 when viewed from behind. The edge of the front grille 131 does not overlap with the fan 61 when viewed from behind. The front grille 131 is arranged at a position closer to the front side of the fan 61 in the axial direction DA.

[0064] The cylindrical structure 132 constitutes the end of the front side of the side wall of the body 11. The cylindrical structure 132 has a cylindrical shape. The cylindrical structure 132 extends from the edge of the front grille 131 to the rear side of the axial direction DA. The cylindrical structure 132 extends from the edge of the front grille 131 that does not overlap with the fan 61 in the rear view to the axial direction DA, so it does not overlap with the fan 61 when viewed from the back. The cylindrical structure 132 is arranged at a position closer to the outside of the fan 61 in the radial direction DR.

[0065] 1.4 Front grille Figure 8 It is a rear view schematically showing the front side cover provided in the air blowing device according to the first embodiment.

[0066] like Figure 8 As shown, the front grille 131 includes a plate structure 141, an annular bone 142, and a plurality of front bones 143. The front grille 131 is formed with an opening 131a.

[0067] The plate structure 141, the annular ribs 142, and the plurality of front ribs 143 are arranged on the front side in the axial direction DA relative to the fan 61. The opening 131a of the front grille 131 is arranged on the front side in the axial direction DA relative to the fan 61. The opening 131a allows the airflow generated by the air blown by the fan 61 and passing through the front cover 53 to pass therethrough.

[0068] The plate-like structure 141 is arranged at the center of the radial direction DR. The plate-like structure 141 has a rectangular plate shape. The plate-like structure 141 may have a plate shape other than the rectangular plate shape.

[0069] The annular bone 142 is arranged outside in the radial direction DR relative to the plate-like structure 141. The annular bone 142 has an annular shape.

[0070] The plurality of front bones 143 are arranged along the circumferential direction DC. The plurality of front bones 143 have a spiral shape wound along one direction DC1 of the circumferential direction DC. Therefore, each front bone 143 included in the plurality of front bones 143 bends toward the other direction DC2 of the circumferential direction DC as it moves toward the outside of the radial direction DR.

[0071] By making the plurality of front ribs 143 spirally shaped in one direction DC1 of the circumferential direction DC, the airflow passing through the front grille 131 can be concentrated near the central axis 61a. Thus, the air supply device 1 can be provided which can deliver wind with high straightness.

[0072] In order to ease the winding of the circumferential DC of the multiple bones 104 toward the other direction DC2, the winding of the circumferential DC of the multiple bones 104 toward the other direction DC2 is gentler than the winding of the circumferential DC of the multiple frontal bones 143 toward the one direction DC1. Therefore, the bending amount of the circumferential DC toward the one direction DC1 at a specific radial position of the multiple bones 104 is smaller than the bending amount of the circumferential DC toward the other direction DC2 at the specific radial position of the multiple frontal bones 143.

[0073] Each front bone 143 has a plate-like shape. Each front bone 143 has a first main surface 143a and a second main surface 143b. The first main surface 143a and the second main surface 143b are located on opposite sides. The first main surface 143a and the second main surface 143b are parallel to the axial direction DA. Each front bone 143 serves as an airflow guide plate, which guides the airflow passing through the opening 131a formed by the plurality of front bones 143 to the axial direction DA.

[0074] 1.5 Configuration of ion generator and rear grille Fig. 9 It is a front view schematically showing the rear grille and the ion generator included in the air blowing device according to the first embodiment.

[0075] like Figures 1 to 4 As shown in FIG. 1 , the rear grille 81 has a perforated bowl-like shape. Therefore, a bowl-like space is formed in the rear grille 81. The ion generator 63 is disposed in the bowl-like space. Figures 1 to 4 as well as Fig. 9 As shown, the rear grille 81 includes a first portion 151 arranged on the rear side in the axial direction DA relative to the ion generator 63 and a second portion 152 arranged on the outside in the radial direction DR relative to the ion generator 63. A first opening 151a is formed in the first portion 151. A second opening 152a is formed in the second portion 152. The first portion 151 is a portion of the bottom portion 91. The second portion 152 is a portion of the side portion 92. Therefore, the second portion 152 is arranged on the outside in the radial direction DR of the plurality of bones 104. The first opening 151a is a portion of the opening 91a. The second opening 152a is a portion of the opening 92a. Thus, the ion generator 63 can generate ions in the airflow passing through the first opening 151a and the airflow passing through the second opening 152a. Thus, the air supply device 1 can effectively send out the generated ions. Thus, the air supply device 1 can supply air with a high ion concentration.

[0076] 1.6 Structure of ion generator like Fig. 9 As shown, the ion generator 63 includes a power source 161 , an electrode 162 , and a housing structure 163 .

[0077] The power source 161 generates a high voltage and applies the generated high voltage to the electrode 162 .

[0078] The electrode 162 generates discharge by applying a high voltage, and ions are generated by the generated discharge.

[0079] The receiving structure 163 is formed with an internal space 163a and an opening 163b. The internal space 163a receives the electrode 162. The opening 163b exposes the internal space 163a toward the outside of the radial direction DR. Thus, when the rear grille 81 is removed, the internal space 163a can be easily reached through the opening 163b. Thus, the electrode 162 received in the internal space 163a can be easily cleaned.

[0080] 1.7 Connection between arm and base Fig.10 The exploded perspective view schematically illustrates a base, a first arm, and a second arm included in the air blowing device according to the first embodiment, as viewed from the upper left front. Fig.11 The exploded perspective view schematically illustrates a base, a first arm, and a second arm included in the air blowing device according to the first embodiment, as viewed from the upper right front.

[0081] like Fig.10 as well as Fig.11 As shown, the base 12 has an outer peripheral surface 12b. A first groove 12c and a second groove 12d are formed on the base 12. The first groove 12c and the second groove 12d are formed on the outer peripheral surface 12b. The first groove 12c and the second groove 12d are separated from each other in the width direction DW1. The outer peripheral surface 12b has a first bottom surface 12e and a second bottom surface 12f that define the first groove 12c and the second groove 12d, respectively. The first bottom surface 12e and the second bottom surface 12f face one direction and the other direction of the width direction DW1, respectively.

[0082] The lower end portion 31 and the lower end portion 41 have shapes that are suitable for the shapes of the first groove 12c and the second groove 12d of the base 12, respectively. The lower end portion 31 and the lower end portion 41 are inserted into the first groove 12c and the second groove 12d, respectively. Thus, the lower end portion 31 and the lower end portion 41 are fixed to the base 12. The lower end portion 31 and the lower end portion 41 are screwed to the base 12. The lower end portion 31 and the lower end portion 41 have a contact surface 31a and a contact surface 41a, respectively. The contact surface 31a and the contact surface 41a face the other side and one side of the width direction DW1. The contact surface 31a and the contact surface 41a are in surface contact with the first bottom surface 12e and the second bottom surface 12f of the base 12, respectively. Thus, the first arm 13 and the second arm 14 can be suppressed from moving in the width direction DW1. Thus, the lateral shaking of the first arm 13 and the second arm 14 can be suppressed. The lower end portion 31 and the lower end portion 41 are respectively housed in the first groove 12 c and the second groove 12 d , and do not protrude from the first groove 12 c and the second groove 12 d in the width direction DW1 .

[0083] The base 12 has an upper surface 12a. The first groove 12c and the second groove 12d of the base 12 are formed along the upper surface 12a. Thus, the lower end 31 and the lower end 41 can be inserted into the first groove 12c and the second groove 12d from the upper surface 12a side, respectively. Thus, the area occupied by the base 12 can be reduced.

[0084] 1.8 Bending of the arm like Fig.10 as well as Fig.11 As shown in FIG. 1 , the first arm 13 and the second arm 14 have a bent rod-like shape. Therefore, the first arm 13 includes a bent portion 33 , and the second arm 14 includes a bent portion 43 .

[0085] The bent portion 33 is located between the lower end portion 31 connected to the base 12 and the upper end portion 32 connected to the body 11. The bent portion 43 is located between the lower end portion 41 connected to the base 12 and the upper end portion 42 connected to the body 11. The first arm 13 is bent at the bent portion 33. The second arm 14 is bent at the bent portion 43. Thus, the first arm 13 and the second arm 14 have a higher strength than an arm having a straight rod shape.

[0086] The curved portion 33 is formed above the base 12. The first arm 13 extends from the lower end 31 to the upper direction of the base 12 to the lower end of the curved portion 33, bends outward in the curved portion 33, and extends upward from the upper end of the curved portion 33 to the upper end 32. The curved portion 43 is formed above the base 12. The second arm 14 extends upward from the lower end 41 to the lower end of the curved portion 43, bends outward in the curved portion 43, and extends upward from the upper end of the curved portion 43 to the upper end 42. Thus, the width of the base 12 can be made smaller than the width of the body 11. In addition, it is possible to prevent the first arm 13 and the second arm 14 from flying out in the width direction DW1 within the range of the height of the base 12. Thus, the area occupied by the base portion composed of the base 12, the lower end 31, and the lower end 41 can be reduced.

[0087] The present disclosure is not limited to the above-described embodiments, and may be replaced with a configuration that is substantially the same as the configuration shown in the above-described embodiments, a configuration that produces the same function and effect, or a configuration that can achieve the same purpose.

Claims

1. An air supply device, characterized in that: have: A fan that rotates in one circumferential direction and sends air to the front side in the axial direction; The grille is arranged at a rear side of the fan in the axial direction and includes a plurality of ribs arranged in the circumferential direction and having a spiral shape wound in the other direction of the circumferential direction.

2. The air supply device according to claim 1, characterized in that: The airflow passing through the plurality of bones is a swirling flow swirling toward the other direction.

3. The air supply device according to claim 1 or 2, characterized in that: The plurality of bones include a first bone extending radially outward from a first radial position and a second bone extending radially outward from a second radial position closer to the outside than the first radial position.

4. The air supply device according to claim 3, characterized in that: The grille includes an annular bone having an annular shape, The second bone protrudes from the annular bone toward the inner side in the radial direction.

5. The air supply device according to claim 1 or 2, characterized in that: The grille has a side portion that does not overlap with the fan when viewed from the rear and extends in the axial direction, The side portion includes a plurality of side bones arranged along the circumferential direction, Each of the plurality of side bones has a plate-like shape and has a first main surface oriented in a direction inclined from the other direction toward the radial outer side and a second main surface oriented in a direction inclined from the one direction toward the radial inner side.

6. The air supply device according to claim 1 or 2, characterized in that: A front grille is provided, the front grille being arranged at a position closer to the front side than the fan, the front grille including a plurality of front ribs arranged in the circumferential direction and having a spiral shape wound in the one direction.

7. The air supply device according to claim 6, characterized in that: The winding of the plurality of bones in the other direction is gentler than the winding of the plurality of front bones in the one direction.

8. The air supply device according to claim 1 or 2, characterized in that: have: ionizer; and A housing is provided with the grille and accommodates the fan and the ion generator.

9. The air supply device according to claim 8, characterized in that: The grille has: A first portion, which is arranged at the rear side relative to the ion generator and is formed with a first opening; and The second portion is arranged radially outward relative to the ion generator and the plurality of bones and has a second opening.

10. The air supply device according to claim 8, characterized in that: The ion generator comprises: Electrodes; and The housing structure is formed with an inner space for housing the electrode and an opening for exposing the inner space to the outside in a radial direction.

11. The air supply device according to claim 1 or 2, characterized in that: The grille includes a plate-like structure, which is disposed at the center in the radial direction, has a disk-like shape, and has a concave surface facing the rear side.

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