air supply device

Abstract

An air supply device includes: a first outer shell-side opposing electrode and a second outer shell-side opposing electrode located on the outer shell surface; a first rotor-body-side opposing electrode located on the rotor-body surface; a second rotor-body-side opposing electrode located on the rotor-body surface and positioned opposite to at least a portion of the second outer shell-side opposing electrode during at least a portion of a revolution of the rotor-body; a first electrode located on the surface of the blade and electrically connected to the first rotor-body-side opposing electrode; and a second electrode located on the surface of the blade in an arrangement along the first electrode and electrically connected to the second rotor-body-side opposing electrode. The air supply device applies an alternating current voltage to the first outer shell-side opposing electrode and the second outer shell-side opposing electrode, thereby generating plasma between the first electrode and the second electrode.

Description

Technical Field

[0001] This invention relates to an air supply device. Background Technology

[0002] A known air supply device incorporates a plasma-based airflow generating device on the surface of the rotating blades of rotating equipment such as fans, windmills, and turbines. In this air supply device, the plasma generated by the airflow generating device influences the velocity distribution of the boundary layer on the surface of the rotating blades, thereby suppressing airflow stripping from the rotating blades. Consequently, the airflow is stabilized in this air supply device, improving the aerodynamic characteristics of the rotating blades.

[0003] As such an air supply device, Patent Document 1 discloses a fan with an airflow generating device having electrodes for generating plasma arranged on its blades.

[0004] In the fan of Patent Document 1, the airflow generating device is electrically connected to a high-frequency power supply that generates a high-frequency voltage via a ring mounted on the fan's rotating shaft and brushes sliding on the ring. That is, in the fan of Patent Document 1, the electrodes on the blades are electrically connected to the high-frequency power supply via a slip ring structure having the ring and the brushes.

[0005] Existing technical documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2012-255432

[0007] In power supply systems like slip ring structures, which utilize sliding components such as rings and brushes, wear of these components due to friction during rotation is inevitable. Therefore, in slip ring structures, to prevent poor contact caused by wear, the sliding components need to be replaced as the fan is used.

[0008] Therefore, there is a need for an air supply device that can generate plasma without replacing the sliding component as described above. Summary of the Invention

[0009] The purpose of this invention is to provide an air supply device that does not cause conductor wear due to friction accompanying mechanical contact between conductors, and can improve the aerodynamic characteristics of a rotating airfoil by generating plasma.

[0010] An exemplary embodiment of the air supply device of the present invention includes: a rotating airfoil having blades arranged circumferentially relative to a central axis extending axially; a motor for rotating the rotating airfoil about the central axis; and a housing supporting the motor and housing the rotating airfoil and the motor. The air supply device includes: a first housing-side opposing electrode and a second housing-side opposing electrode located on the housing surface of the housing, spaced apart from the rotating airfoil surface of the rotating airfoil; a first rotating airfoil-side opposing electrode located on the rotating airfoil surface and positioned opposite at least a portion of the first housing-side opposing electrode for at least a portion of a rotation of the rotating airfoil; a second rotating airfoil-side opposing electrode located on the rotating airfoil surface and positioned opposite at least a portion of the second housing-side opposing electrode for at least a portion of a rotation of the rotating airfoil; a first electrode located on the surface of the blades and electrically connected to the first rotating airfoil-side opposing electrode; and a second electrode located on the surface of the blades arranged along the first electrode and electrically connected to the second rotating airfoil-side opposing electrode. The air supply device applies an alternating voltage to the first housing-side opposing electrode and the second housing-side opposing electrode, thereby generating plasma between the first electrode and the second electrode.

[0011] The effects of this invention are as follows.

[0012] According to the present invention, the conductors will not wear due to friction accompanying the mechanical contact between the conductors, and the aerodynamic characteristics of the rotating airfoil can be improved by generating plasma. Attached Figure Description

[0013] Figure 1 This is a front side perspective view illustrating the schematic configuration of an air supply device according to an exemplary embodiment.

[0014] Figure 2 This is an exploded perspective view showing the schematic configuration of an air supply device according to an exemplary embodiment.

[0015] Figure 3 yes Figure 1 A cross-sectional view along line III-III.

[0016] Figure 4 It is an exploded view of the frame and rotating wing when viewed from above.

[0017] Figure 5 It is a schematic cross-sectional view showing the plasma generation method in the air supply device.

[0018] Figure 6 This is a schematic cross-sectional view showing the general configuration of the air supply device in Modified Example 1.

[0019] Figure 7 It is an exploded view of the frame and rotating wing when viewed from above.

[0020] Figure 8 This is a schematic cross-sectional view showing the general configuration of the air supply device in Modified Example 2.

[0021] Figure 9 This is a schematic cross-sectional view showing the general configuration of the air supply device in Modified Example 3.

[0022] In the diagram: 11, 12, 13, 14—Air supply device; 20—Rotating airfoil; 201—One axial end; 202—The other axial end; 21—Cylindrical section; 212—The other axial end; 22—End face; 23—Blade; 231—Surface; 25—Dielectric; 251—One side surface; 271—Opposite electrode on the first rotating airfoil side; 272—Connecting line; 273—First electrode; 281—Opposite electrode on the second rotating airfoil side; 282—Connecting line; 283—Second electrode; 30—Motor; 40—Outer shell; 50—Shell; 51—Receiving part; 511—One axial end; 5110—Air inlet; 512—The other axial end; 5120—Exhaust port; 52—Motor support; 521—Stationary airfoil; 522—Base; 523—Second opposing part; 60—Frame; 61—Outer frame; 62—Beam Part, 63—First opposing part, 71—First outer shell side opposing electrode, 711—Connecting line, 81—Second outer shell side opposing electrode, 811—Connecting line, 90—High frequency high voltage supply part, 1421—Cylindrical part, 14212—Other axial end, 1422—First blade connection part, 1423—Blade, 1424—Second blade connection part, 1451—Side part, 14513—Exhaust port, 1452—One axial side part, 14521—Opening part, 1453—Other axial side part, POW—AC power supply, SF101, SF102—Rotor body surface, SF11, SF31—First rotor body surface, SF12, SF32—Second rotor body surface, SF201, SF202—Outer shell surface, SF21, SF41—First outer shell surface, SF22, SF42—Second outer shell surface. Detailed Implementation

[0023] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same or corresponding parts in the drawings are labeled with the same reference numerals, and will not be described again. Furthermore, the dimensions of the constituent components in the drawings do not faithfully represent the actual dimensions of the constituent components or the dimensional proportions of each constituent component.

[0024] It should be noted that in the following description, in the air supply device 11, air supply device 12, air supply device 13 and air supply device 14, the direction parallel to the central axis P of the rotating airfoil 20 is called the axial direction A, the direction orthogonal to the central axis P is called the radial direction B, and the direction along the arc centered on the central axis P is called the circumferential direction C.

[0025] Furthermore, in the following explanation, "equivalent" refers not only to cases of strict equality, but also to cases of being identical to a degree that can be considered substantially equal.

[0026] Furthermore, in the following explanation, terms such as "fixed," "connected," and "installed" include not only cases where components are in direct contact with each other and fixed, but also cases where they are fixed via other components. That is, in the following explanation, terms such as "fixed" include the meaning of components being directly or indirectly fixed to each other.

[0027] (Brief Structure)

[0028] Figure 1 This is a front side perspective view showing the schematic configuration of the air supply device 11 according to an exemplary embodiment. Figure 2 This is an exploded perspective view showing the schematic configuration of the air supply device 11 according to an exemplary embodiment. Figure 3 yes Figure 1 A cross-sectional view along line III-III. Figure 4 This is an exploded view of the frame 60 and the rotating airfoil 20 from a top-down perspective. It should be noted that, for ease of explanation, Figure 4 The exploded view is shown as the upper surface, but this orientation is not intended to limit the orientation of the air supply device 11 and the rotating airfoil 20 of the present invention during use.

[0029] Reference Figures 1 to 4 The air supply device 11 is an axial flow fan that draws in gas from one side A1, which is the upstream side of the axial direction A, and blows the drawn-in gas out to the other side A2, which is the downstream side of the axial direction A. The air supply device 11 includes a rotating airfoil 20, a motor 30, a housing 40, a first housing-side opposing electrode 71 and a second housing-side opposing electrode 81, a first rotating airfoil-side opposing electrode 271 and a second rotating airfoil-side opposing electrode 281, a first electrode 273 and a second electrode 283, and a high-frequency high-voltage supply unit 90.

[0030] (Rotating airfoil)

[0031] The rotating airfoil 20 is a moving airfoil that can rotate with the rotation of the motor 30 around a central axis P extending along the axial direction A. The rotating airfoil 20 has a cylindrical part 21, an end part 22, and multiple blades 23.

[0032] The cylindrical portion 21 is cylindrical in shape, extending along the axial direction A. One axial side A1 of the cylindrical portion 21 is closed by the end portion 22. The other axial side A2 of the cylindrical portion 21 is open.

[0033] The end portion 22 is located on one side of the axial A of the cylindrical portion 21.

[0034] The blade 23 extends outward B1 along the radial direction B of the central axis P relative to the cylindrical portion 21. The blade 23 is arranged circumferentially relative to the central axis P.

[0035] (First rotating airfoil surface and second rotating airfoil surface)

[0036] The first rotating airfoil surface SF11 is located at one axial end 201 of the rotating airfoil 20. Specifically, the first rotating airfoil surface SF11 is included on one axial side of the end face 22.

[0037] The second rotating airfoil surface SF12 is located at the other axial end 202 of the rotating airfoil 20. Specifically, the second rotating airfoil surface SF12 is included on the radially outer side of the other axial end 212 of the cylindrical portion 21.

[0038] (motor)

[0039] The motor 30 rotates the rotary airfoil 20 by rotating its shaft around the central axis P. A known motor with a rotor and stator can be used for the motor 30. The motor 30 is located inside the cylindrical portion 21 of the rotary airfoil 20.

[0040] (shell)

[0041] The housing 40 supports the motor 30 and houses the rotary airfoil 20 and the motor 30. The housing 40 has a shell 50 and a frame 60.

[0042] (case)

[0043] The housing 50 has a receiving portion 51 and a motor support portion 52.

[0044] The housing 51 surrounds the radially outer side B1 of the rotor body 20 and the motor 30. The housing 51 has an air inlet 5110 located at one axial end 511 and an exhaust port 5120 located at the other axial end 512. The rotor body 20 is rotated by the motor 30, whereby gas is drawn in through the air inlet 5110 and the drawn-in gas is expelled through the exhaust port 5120.

[0045] The motor support 52 is located on the opposite side A2 of the housing 51 along the axial direction. The motor support 52 supports the motor 30 relative to the housing 51.

[0046] In detail, the motor support portion 52 has a stationary wing 521, a base portion 522, and a second opposing portion 523.

[0047] The stator 521 extends radially inward from the axial end 512 of the housing 51 towards the B2. The stator 521 supports the base 522 relative to the housing 51. Furthermore, the stator 521 adjusts the flow of the gas passing through it.

[0048] The base portion 522 supports the motor 30 located within the housing portion 51. The stationary wing 521 is connected to the outer periphery of the base portion 522.

[0049] When viewed from the axial direction A, the second opposing portion 523 is located at the outer periphery of the base portion 522. The second opposing portion 523 extends along one axial side A1 relative to the axial side of the base portion 522. The second opposing portion 523 is arranged radially outward at a distance D2 from the other axial end 212 of the cylindrical portion 21 of the rotating airfoil 20, at a distance B1.

[0050] (Frame)

[0051] The frame 60 is located on one axial side A1 of the receiving portion 51. The frame 60 has an outer frame 61, a beam portion 62, and a first opposing portion 63.

[0052] Viewed from axial direction A, the outer frame 61 is located around the air inlet 5110. A beam 62 extends radially inward from the outer frame 61 towards the inner side B2. A first opposing portion 63 is supported on the outer frame 61 by the beam 62. The first opposing portion 63 is positioned axially at a distance D1 from the end face 22 of the rotating airfoil 20 on one side A1. Viewed from axial direction A, the first opposing portion 63 at least partially overlaps with the end face 22.

[0053] (First outer shell surface and second outer shell surface)

[0054] In the outer casing 40, the first outer casing surface SF21 is located opposite to the first rotor surface SF11 of the rotor 20. Specifically, the first outer casing surface SF21 is included on the other axial side of the first opposing portion 63 of the frame 60.

[0055] In the outer casing 40, the second outer casing surface SF22 is located opposite to the second rotor surface SF12 of the rotor body 20. Specifically, the second outer casing surface SF22 is included in the radially inner side of the second opposing portion 523.

[0056] (Opposite electrode on the first outer casing side)

[0057] The first outer shell side opposing electrode 71 is located on the first outer shell surface SF21, which is positioned at a distance D1 relative to the first rotating airfoil surface SF11. The first outer shell side opposing electrode 71 is electrically connected to the high-frequency high-voltage supply unit 90 via a connecting line 711. The first outer shell side opposing electrode 71 is, for example, circular.

[0058] (Second outer casing side opposing electrode)

[0059] The second outer shell side opposing electrode 81 is located on the second outer shell surface SF22, which is positioned at a distance D2 relative to the second rotating airfoil surface SF12. The second outer shell side opposing electrode 81 is electrically connected to the high-frequency high-voltage supply unit 90 via a connecting line 811. The second outer shell side opposing electrode 81 is, for example, in the form of a ring centered on the central axis P.

[0060] (Opposite electrode on the side of the first rotating airfoil)

[0061] The first rotating wing-side opposing electrode 271 is located on the first rotating wing surface SF11 of the rotating wing 20. The first rotating wing-side opposing electrode 271 is, for example, circular in shape, the same as the first outer shell-side opposing electrode 71. The first rotating wing-side opposing electrode 271 is located opposite the first outer shell-side opposing electrode 71 throughout the entire period of one rotation of the rotating wing 20.

[0062] (Opposite electrode on the side of the second rotating airfoil)

[0063] The second rotor body-side opposing electrode 281 is located on the second rotor body surface SF12 of the rotor body 20. The second rotor body-side opposing electrode 281 is, for example, an annular shape centered on the central axis P and having a smaller radius than the second outer shell-side opposing electrode 81. The second rotor body-side opposing electrode 281 is positioned opposite the second outer shell-side opposing electrode 81 throughout the entire rotation of the rotor body 20.

[0064] (First electrode)

[0065] The first electrode 273 is located on the surface 231 of the blade 23. More specifically, the first electrode 273 is located on the upstream side of the blade 23. The first electrode 273 is electrically connected to the opposing electrode 271 on the first rotor body side via a connecting line 272.

[0066] (Second electrode)

[0067] The second electrode 283 is located on the surface 231 of the blade 23, arranged along the first electrode 273. More specifically, the second electrode 283 is located on the upstream side of the blade 23. The second electrode 283 is electrically connected to the opposing electrode 281 on the second rotor body side via a connecting line 282. It should be noted that the dielectric 25 is located between the first electrode 273 and the second electrode 283, but this is omitted for ease of viewing in the drawings. Figures 1 to 4 The illustration is omitted. Dielectric 25 will be discussed later. Figure 5 Please provide a detailed explanation.

[0068] (High-Frequency High-Voltage Supply Department)

[0069] The high-frequency, high-voltage supply unit 90 is electrically connected to the AC power supply (POW). The AC power supply (POW) can be a commercial AC power supply. The frequency of the AC power supply (POW) can be 50Hz or 60Hz. The voltage of the AC power supply (POW) can be from 50V to 400V.

[0070] The high-frequency high-voltage supply unit 90 generates high-frequency high-voltage power by increasing the frequency and voltage of the AC current input from the AC power source POW, and supplies it to the first housing-side counter electrode 71 and the second housing-side counter electrode 81.

[0071] The high-frequency high-voltage supply unit 90 supplies high-frequency high-voltage power with a frequency of 1 kHz or higher and a voltage of 1 kV or higher to the first housing-side counter electrode 71 and the second housing-side counter electrode 81. The frequency of the high-frequency high-voltage power supplied by the high-frequency high-voltage supply unit 90 can be in the range of 1 kHz to 100 MHz, 1 kHz to 1 MHz, or 1 kHz to 20 kHz. The voltage of the high-frequency high-voltage power supplied by the high-frequency high-voltage supply unit 90 can be in the range of 1 kV to 10 kV. It should be noted that, as described below, the high-frequency high-voltage supply unit 90 can also output power with a frequency or voltage range different from the above-mentioned ranges within the range where plasma is generated between the first electrode 273 and the second electrode 283.

[0072] The high-frequency high-voltage supply unit 90 may include, for example, a high-frequency voltage generator that modulates the AC power supply POW to generate a high-frequency voltage; and a booster that boosts the high-frequency voltage generated by the high-frequency voltage generator and outputs it to the first housing-side counter electrode 71 and the second housing-side counter electrode 81.

[0073] The high-frequency high-voltage supply unit 90 may also be composed of a device that integrates the high-frequency voltage generating device and the booster. It should be noted that the method for generating the high-frequency high-voltage power in the high-frequency high-voltage supply unit 90 can use known techniques. Furthermore, for example, the high-frequency high-voltage supply unit 90 may perform high-frequency processing after boosting.

[0074] (Methods of plasma generation in the air supply device)

[0075] Figure 5This is a schematic cross-sectional view illustrating the plasma generation method in the air supply device 11. In the air supply device 11, a high-frequency, high-voltage alternating voltage is applied to the first housing-side opposing electrode 71 and the second housing-side opposing electrode 81, thereby generating plasma between the first electrode 273 and the second electrode 283.

[0076] Combination Figures 1 to 4 And refer to Figure 5 The plasma generation method in the air supply device 11 is described in detail below. The plasma in the air supply device 11 can be generated using a dielectric barrier discharge method. The dielectric barrier discharge method is as follows: a dielectric is sandwiched between electrodes, and a high-frequency, high-voltage alternating current or pulsed voltage is applied to each electrode, thereby generating plasma.

[0077] As described above, dielectric 25 is located between the first electrode 273 and the second electrode 283. Dielectric 25 is located on surface 231, which is one side of blade 23.

[0078] The first electrode 273 is arranged such that it is exposed on one side surface 251 of the dielectric 25 in the thickness direction THK.

[0079] The second electrode 283 is located within the dielectric 25 such that it moves away from one side surface 251 of the dielectric 25 in the thickness direction THK and towards the other side THK2 in the thickness direction THK. Furthermore, as described above, when viewed from the thickness direction THK, the second electrode 283 is arranged side by side with the first electrode 273.

[0080] In the above configuration, the first outer shell side opposing electrode 71 and the first rotary wing side opposing electrode 271 are opposed to each other throughout the entire period of one rotation of the rotary wing 20. Furthermore, the second outer shell side opposing electrode 81 and the second rotary wing side opposing electrode 281 are opposed to each other throughout the entire period of one rotation of the rotary wing 20.

[0081] Therefore, when the rotating wing body 20 is rotating, and the high-frequency high-voltage supply unit 90 applies a high-frequency high-voltage AC voltage to the first outer shell side opposing electrode 71 and the second outer shell side opposing electrode 81, the two pairs of opposing electrodes, namely the first outer shell side opposing electrode 71 and the first rotating wing body side opposing electrode 271, and the second outer shell side opposing electrode 81 and the second rotating wing body side opposing electrode 281, respectively function as capacitors.

[0082] Therefore, current is supplied to the first electrode 273, which is electrically connected to the first rotor body-side opposing electrode 271, and the second electrode 283, which is electrically connected to the second rotor body-side opposing electrode 281. Thus, even without a conductor connection, power can be supplied from the outer shell side to the first electrode 273 and the second electrode 283 on the rotor body side.

[0083] Furthermore, when high-frequency, high-voltage electricity is supplied to the first electrode 273 and the second electrode 283, which are arranged side-by-side on the blades 23 of the rotating airfoil 20, a discharge occurs between the first electrode 273 and the second electrode 283. Since the dielectric 25 is located between the first electrode 273 and the second electrode 283, an arc discharge is avoided, and a stable dielectric barrier discharge is generated. This dielectric barrier discharge is a surface discharge that occurs along one side surface 251 of the dielectric 25. This dielectric barrier discharge generates an airflow AR1 flowing from the first electrode 273 to the second electrode 283.

[0084] From another perspective, the high-frequency high-voltage supply unit 90, the first outer shell side opposing electrode 71, the first rotor body side opposing electrode 271, the first electrode 273, the second outer shell side opposing electrode 81, the second rotor body side opposing electrode 281, the second electrode 283, and the dielectric 25 constitute a plasma generating device.

[0085] According to the above configuration, plasma can be generated between the first electrode 273 and the second electrode 283. Therefore, the aerodynamic characteristics of the rotating airfoil 20 can be improved by utilizing the plasma generated by the dielectric barrier discharge.

[0086] As described above, with this configuration, power can be supplied to the first electrode 273 and the second electrode 283 of the rotary airfoil 20 without the conductors coming into mechanical contact with each other, and plasma can be generated between the first electrode 273 and the second electrode 283. Furthermore, according to this configuration, conductor wear caused by friction accompanying mechanical contact between the conductors can be avoided. Therefore, conductor wear is prevented due to friction accompanying mechanical contact between the conductors, and the aerodynamic characteristics of the rotary airfoil 20 can be improved by generating plasma.

[0087] Furthermore, as described above, at least a portion of the first rotor body-side opposing electrode 271 is opposed to the first outer shell-side opposing electrode 71 throughout the entire period of one rotation of the rotor body 20. Furthermore, at least a portion of the second rotor body-side opposing electrode 281 is opposed to the second outer shell-side opposing electrode 81 throughout the entire period of one rotation of the rotor body 20.

[0088] According to the above configuration, power can be supplied to the first rotor-side opposing electrode 271 or the second rotor-side opposing electrode 281 throughout the entire period of one rotation of the rotor body 20. As a result, plasma can be generated more efficiently.

[0089] Furthermore, in the above configuration, the rotary airfoil 20 has: a first rotary airfoil surface SF11 located at one axial end 201 of the rotary airfoil 20; and a second rotary airfoil surface SF12 located at the other axial end 202 of the rotary airfoil 20. A first rotary airfoil-side opposing electrode 271 is located on the first rotary airfoil surface SF11. A second rotary airfoil-side opposing electrode 281 is located on the second rotary airfoil surface SF12. The outer shell 40 has: a first outer shell surface SF21 located opposite the first rotary airfoil surface SF11; and a second outer shell surface SF22 located opposite the second rotary airfoil surface SF12. A first outer shell-side opposing electrode 71 is located on the first outer shell surface SF21. A second outer shell-side opposing electrode 81 is located on the second outer shell surface SF22.

[0090] In the above configuration, the pair of the first rotor body-side opposing electrode 271 and the first outer shell-side opposing electrode 71 is located at a position far apart from the pair of the second rotor body-side opposing electrode 281 and the second outer shell-side opposing electrode 81 in the axial direction A. This reduces the possibility of discharge occurring at locations other than between the pair of the first rotor body-side opposing electrode 271 and the first outer shell-side opposing electrode 71, and between the pair of the second rotor body-side opposing electrode 281 and the second outer shell-side opposing electrode 81.

[0091] Furthermore, in the above configuration, the air supply device 11 is an axial flow fan. Additionally, the first rotating airfoil surface SF11 is included on one axial side of the end portion 22. The first outer shell surface SF21 is included on the other axial side of the first opposing portion 63 of the frame 60. The second rotating airfoil surface SF12 is included on the radially outer side of the other axial end portion 212 of the cylindrical portion 21. The second outer shell surface SF22 is included on the radially inner side of the second opposing portion 523.

[0092] Therefore, in the above configuration, the first rotor blade-side opposing electrode 271 is located on the first rotor blade surface SF11 at the end portion 22. The second rotor blade-side opposing electrode 281 is located on the second rotor blade surface SF12 at the other axial end portion 212 of the cylindrical portion 21. The first outer shell-side opposing electrode 71 is located on the first outer shell surface SF21 at the first opposing portion 63 of the frame 60. The second outer shell-side opposing electrode 81 is located on the second outer shell surface SF22 at the second opposing portion 523 of the motor support portion 52.

[0093] Based on the above configuration, the first outer casing side opposing electrode 71 and the second outer casing side opposing electrode 81 can be positioned separately using the axial fan frame 60 and the motor support 52. Therefore, an axial fan capable of improving the aerodynamic characteristics of the rotating airfoil 20 by generating plasma can be easily obtained.

[0094] Furthermore, the above configuration also includes a high-frequency high-voltage supply unit 90, which generates high-frequency high-voltage power based on AC power POW and supplies it to the first housing-side counter electrode 71 and the second housing-side counter electrode 81.

[0095] In the above configuration, a high-frequency high voltage, obtained by increasing the frequency of the alternating current and boosting the voltage, is supplied to the first outer shell side counter electrode 71 and the second outer shell side counter electrode 81. If an appropriate distance is maintained between the counter electrodes forming the capacitor, arcing that would cause insulation failure can be avoided between the counter electrodes even when a high voltage is generated. Therefore, in the above configuration, a high-frequency generator or booster is not required on the rotor 20. This increases design freedom, such as miniaturization, of the rotor 20.

[0096] (Variation Example 1)

[0097] Figure 6 This is a schematic cross-sectional view showing the general configuration of the air supply device 12 in Modified Example 1. Figure 7 This is an exploded view of the frame 60 and the rotating airfoil 20 from a top-down perspective. The air supply device 12 of the modified embodiment 1 differs from the air supply device 11 of the above embodiment in that it has two pairs of opposing electrodes arranged on the upstream side. Hereinafter, descriptions of configurations identical to those in the above embodiment will be omitted; only configurations different from those in the above embodiment will be described.

[0098] Reference Figure 6 and Figure 7 The air supply device 12 has a rotating wing body 20, a motor 30, a housing 40, a first housing side opposing electrode 71 and a second housing side opposing electrode 81, a first rotating wing body side opposing electrode 271 and a second rotating wing body side opposing electrode 281, as well as a first electrode 273 and a second electrode 283.

[0099] The rotating airfoil 20 has a cylindrical portion 21, an end portion 22, and a plurality of blades 23. The rotating airfoil surface SF101 is located at one axial end portion 201 of the rotating airfoil 20. Specifically, the rotating airfoil surface SF101 is included on one axial side of the end portion 22.

[0100] The outer casing 40 has a housing 50 and a frame 60. The housing 50 has a receiving portion 51 and a motor support portion 52. The motor support portion 52 has a stationary wing 521 and a base portion 522.

[0101] The frame 60 has an outer frame 61, a beam 62, and a first opposing part 63.

[0102] In the outer casing 40, the outer casing surface SF201 is located opposite to the rotor surface SF101 of the rotor wing 20. Specifically, the outer casing surface SF201 is included on the other axial side of the first opposing portion 63 of the frame 60.

[0103] (Position and shape of the two pairs of opposing electrodes)

[0104] The first outer shell side opposing electrode 71 and the second outer shell side opposing electrode 81 are respectively located on the outer shell surface SF201 opposite to the rotating airfoil surface SF101. That is, the first outer shell side opposing electrode 71 and the second outer shell side opposing electrode 81 are located on the other side of the first opposing part 63 in the axial direction.

[0105] The first outer casing side opposing electrode 71 is, for example, in a circle centered on the central axis P.

[0106] The second outer casing side counter electrode 81 is, for example, in the form of a ring centered on the central axis P and surrounding the radially outer side B1 of the first outer casing side counter electrode 71.

[0107] The first rotor body side opposing electrode 271 and the second rotor body side opposing electrode 281 are located on the rotor body surface SF101 of the rotor body 20, respectively.

[0108] The first rotor body side opposing electrode 271 is, for example, circular in shape, the same as the first outer shell side opposing electrode 71.

[0109] The second rotor body side opposing electrode 281 is, for example, an annular shape with the same shape as the second outer shell side opposing electrode 81.

[0110] The first rotor body-side opposing electrode 271 and the second rotor body-side opposing electrode 281 are respectively positioned opposite the first outer shell-side opposing electrode 71 and the second outer shell-side opposing electrode 81 during the entire period of one rotation of the rotor body 20.

[0111] The first rotating airfoil-side opposing electrode 271 is electrically connected to the first electrode 273 via a connecting line 272. The connecting line 272 extends, for example, from one axial side of the end face 22 to the other axial side of the end face 22. Moreover, the connecting line 272 extends along the inner surface of the end face 22 and the cylindrical portion 21, extends from the inner surface of the cylindrical portion 21 to the outer surface, and is electrically connected to the first electrode 273.

[0112] The second rotating airfoil-side opposing electrode 281 is electrically connected to the second electrode 283 via a connecting line 282. The connecting line 282 extends, for example, along the outer surface of the rotating airfoil 20 and is electrically connected to the second electrode 283.

[0113] As described above, a portion of the connecting line 272 passes through the inner surface of the rotating airfoil 20, and the connecting line 282 passes through the outer surface of the rotating airfoil 20, thereby preventing the connecting lines 272 and 282 from crossing on the same plane.

[0114] Furthermore, based on the above configuration, the first outer casing side opposing electrode 71 and the second outer casing side opposing electrode 81 can be configured using the frame 60 of the axial fan. Thus, an axial fan capable of improving the aerodynamic characteristics of the rotating airfoil 20 by generating plasma can be easily obtained.

[0115] (Variation Example 2)

[0116] Figure 8 This is a schematic cross-sectional view showing the general configuration of the air supply device 13 in Modified Example 2. The air supply device 13 in Modified Example 2 differs from the air supply device 11 in the above-described embodiment in that it has two pairs of opposing electrodes arranged on the downstream side. Hereinafter, descriptions of configurations identical to those in the above-described embodiment will be omitted; only configurations different from those described will be described.

[0117] Reference Figure 8 The air supply device 13 has a rotating wing body 20, a motor 30, a housing 40, a first housing side opposing electrode 71 and a second housing side opposing electrode 81, a first rotating wing body side opposing electrode 271 and a second rotating wing body side opposing electrode 281, and a first electrode 273 and a second electrode 283.

[0118] The airfoil 20 has a cylindrical portion 21 serving as a blade support, an end portion 22, and a plurality of blades 23. The airfoil surface SF102 is located at the other axial end portion 202 of the airfoil 20. Specifically, the airfoil surface SF102 is included on the radially outer side of the other axial end portion 212 of the cylindrical portion 21.

[0119] The housing 40 has a receiving portion 51 and a motor support portion 52. The motor support portion 52 has a stationary wing 521, a base portion 522, and a second opposing portion 523.

[0120] In the outer casing 40, the outer casing surface SF202 is located opposite to the rotor surface SF102 of the rotor body 20. Specifically, the outer casing surface SF202 is included in the radially inner side of the second opposing portion 523.

[0121] (Position and shape of the two pairs of opposing electrodes)

[0122] The first outer shell side opposing electrode 71 and the second outer shell side opposing electrode 81 are respectively located on the outer shell surface SF202 opposite to the rotating airfoil surface SF102. That is, the first outer shell side opposing electrode 71 and the second outer shell side opposing electrode 81 are located on the radially inner side of the second opposing portion 523.

[0123] The first outer casing side opposing electrode 71 is, for example, in a ring shape centered on the central axis P.

[0124] The second housing-side opposing electrode 81 is, for example, an annular shape centered on the central axis P, and has the same shape as the first housing-side opposing electrode 71. The second housing-side opposing electrode 81 is located at a position offset axially to the other side A2 relative to the first housing-side opposing electrode 71.

[0125] The first rotor body side opposing electrode 271 and the second rotor body side opposing electrode 281 are located on the rotor body surface SF102 of the rotor body 20, respectively.

[0126] The first rotor body-side opposing electrode 271 is, for example, an annular shape with a radius smaller than that of the second outer shell-side opposing electrode 81, centered on the central axis P.

[0127] The second rotor body-side opposing electrode 281 is, for example, an annular shape centered on the central axis P, and has the same shape as the first rotor body-side opposing electrode 271. The second rotor body-side opposing electrode 281 is located at a position offset axially to the other side A2 relative to the first rotor body-side opposing electrode 271.

[0128] The first rotor body-side opposing electrode 271 and the second rotor body-side opposing electrode 281 are respectively positioned opposite the first outer shell-side opposing electrode 71 and the second outer shell-side opposing electrode 81 during the entire period of one rotation of the rotor body 20.

[0129] The first rotating airfoil-side opposing electrode 271 is electrically connected to the first electrode 273 via a connecting line 272. The connecting line 272 extends, for example, along the outer surface of the rotating airfoil 20 and is electrically connected to the first electrode 273.

[0130] The second rotating airfoil-side opposing electrode 281 is electrically connected to the second electrode 283 via a connecting line 282. The connecting line 282 extends, for example, from the radially outer side of the other axial end 212 of the cylindrical portion 21 to the radially inner side. Moreover, the connecting line 282 extends along the inner surface of the cylindrical portion 21 towards one axial side A1, and again extends from the inner surface of the cylindrical portion 21 to the outer surface, where it is electrically connected to the second electrode 283.

[0131] As described above, the connecting line 272 passes through the outer surface of the rotating airfoil 20, and a portion of the connecting line 282 passes through the inner surface of the rotating airfoil 20, thereby preventing the connecting line 272 and the connecting line 282 from crossing on the same plane.

[0132] Furthermore, based on the above configuration, the first outer casing side opposing electrode 71 and the second outer casing side opposing electrode 81 can be configured using the motor support portion 52 of the axial fan. Thus, an axial fan capable of improving the aerodynamic characteristics of the rotating airfoil 20 by generating plasma can be easily obtained.

[0133] (Variation Example 3)

[0134] Figure 9 This is a schematic cross-sectional view showing the general configuration of the air supply device 14 in Modified Example 3. The air supply device 14 in Modified Example 3 differs from the air supply device 11 in the above-described embodiment in that the air supply device 14 is a centrifugal fan. Hereinafter, descriptions of configurations identical to those in the above-described embodiment will be omitted, and only configurations different from those in the above-described embodiment will be described.

[0135] Reference Figure 9 The air supply device 14 includes a rotating wing body 20, a motor 30, a housing 40, a first housing-side opposing electrode 71 and a second housing-side opposing electrode 81, a first rotating wing body-side opposing electrode 271 and a second rotating wing body-side opposing electrode 281, as well as a first electrode 273 and a second electrode 283.

[0136] (Rotating airfoil)

[0137] The rotating airfoil 20 has a cylindrical portion 1421, a first blade connection portion 1422, multiple blades 1423, and a second blade connection portion 1424.

[0138] The cylindrical portion 1421 is cylindrical in shape, centered on the central axis P and extending along the axial direction A. The first blade connecting portion 1422 is connected to the other axial end portion 14212 of the cylindrical portion 1421.

[0139] The first blade connecting portion 1422 extends in a circular shape from the other end 14212 of the cylindrical portion 1421 in the axial direction outward to the radially outward B1.

[0140] The other axial end of blade 1423 is connected to the first blade connecting portion 1422. Blade 1423 extends along axial direction A. Blades 1423 are arranged circumferentially C.

[0141] The second blade connecting portion 1424 is connected to one axial end of the blade 1423. The second blade connecting portion 1424 is, for example, an annular shape with a radius larger than that of the opening portion 14521 described later.

[0142] (First rotating airfoil surface and second rotating airfoil surface)

[0143] The first rotor surface SF31 is included on one axial side of the second blade connection portion 1424. The second rotor surface SF32 is included on the other axial side of the first blade connection portion 1422.

[0144] (motor)

[0145] Motor 30 is located inside cylindrical section 1421. Motor 30 rotates the rotary airfoil 20 by rotating its shaft around the central axis P.

[0146] (shell)

[0147] The housing 40 has a side portion 1451, an axial side portion 1452, and an axial other side portion 1453.

[0148] Side portion 1451 surrounds the radially outer side B1 of the rotor body 20 and the motor 30. Side portion 1451 has an exhaust port 14513.

[0149] The axial side portion 1452 is located on the axial side A1 of the side portion 1451. The axial side portion 1452 has a circular opening 14521 centered on the central axis P.

[0150] The other axial side portion 1453 is located on the other axial side A2 of the side portion 1451. The other axial side portion 1453 supports the motor 30 at the position through which the central shaft P passes.

[0151] (First outer shell surface and second outer shell surface)

[0152] In the outer casing 40, the first outer casing surface SF41 is located opposite to the first rotor surface SF31 of the rotor body 20. That is, the first outer casing surface SF41 is included on the other axial side of the axial side portion 1452.

[0153] In the outer casing 40, the second outer casing surface SF42 is located opposite to the second rotor surface SF32 of the rotor 20. That is, the second outer casing surface SF42 is included on one axial side of the other axial side portion 1453.

[0154] (Opposite electrode on the side of the first rotating airfoil)

[0155] The first rotor body-side opposing electrode 271 is located on the first rotor body surface SF31 of the rotor body 20. That is, the first rotor body-side opposing electrode 271 is located on one axial side of the second blade connection portion 1424. When viewed from the axial direction A, the first rotor body-side opposing electrode 271 is annular. When viewed from the axial direction A, at least a portion of the first rotor body-side opposing electrode 271 overlaps with the second blade connection portion 1424.

[0156] (Opposite electrode on the side of the second rotating airfoil)

[0157] The second rotor body-side opposing electrode 281 is located on the second rotor body surface SF32 of the rotor body 20. That is, the second rotor body-side opposing electrode 281 is located on the other side of the first blade connection portion 1422 along the axial direction. Alternatively, the second rotor body-side opposing electrode 281 may also be located on the other end face of the blade 1423. When viewed from the axial direction A, the second rotor body-side opposing electrode 281 is annular in shape.

[0158] (Opposite electrode on the first outer casing side)

[0159] The first outer shell-side opposing electrode 71 is located on the first outer shell surface SF41, which is spaced D1 away from the first rotor surface SF31. The first outer shell-side opposing electrode 71 is, for example, annular in shape with the same shape as the first rotor surface-side opposing electrode 271. The first outer shell-side opposing electrode 71 is located opposite the first rotor surface-side opposing electrode 271 throughout the entire period of one rotation of the rotor 20.

[0160] (Second outer casing side opposing electrode)

[0161] The second outer shell side opposing electrode 81 is located on the second outer shell surface SF42, which is positioned opposite the second rotor surface SF32 at a distance D2. The second outer shell side opposing electrode 81 is, for example, annular in shape with the same shape as the second rotor surface opposing electrode 281. The second outer shell side opposing electrode 81 is positioned opposite the second rotor surface opposing electrode 281 throughout the entire period of one rotation of the rotor 20.

[0162] It should be noted that the first housing-side opposing electrode 71 and the second housing-side opposing electrode 81 are electrically connected to the high-frequency high-voltage supply unit as described above, but this is done to make the drawings easier to view. Figure 9 The illustration is omitted.

[0163] (First electrode)

[0164] The first electrode 273 is located on the surface of the blade 1423. The first electrode 273 extends axially along the blade 1423. The first electrode 273 is electrically connected to the opposing electrode 271 on the first rotor body side via a connecting line 272.

[0165] (Second electrode)

[0166] The second electrode 283 is located on the surface of the blade 1423 and is arranged along the first electrode 273. The second electrode 283 is electrically connected to the opposing electrode 281 on the second rotor body side via a connecting line 282. It should be noted that the dielectric material, as described above, is located between the first electrode 273 and the second electrode 283, but this is omitted for ease of viewing in the accompanying drawings. Figure 9 The illustration is omitted.

[0167] (Operation of the air supply device)

[0168] Motor 30 rotates the rotor 20 around its central axis P, causing gas to flow into the housing 40 through opening 14521. The gas flowing into the housing 40 is then expelled to the radially outer side B1 of the rotor 20 as it rotates. The gas expelled to the radially outer side B1 of the rotor 20 is then discharged to the outside of the housing 40 through exhaust port 14513 located at the side 1451 of the housing 40.

[0169] According to the above configuration, by supplying high-frequency, high-voltage electricity to the first outer shell-side opposing electrode 71 and the second outer shell-side opposing electrode 81, plasma can be generated between the first electrode 273 and the second electrode 283. By generating this plasma, an airflow is generated from the first electrode 273 to the second electrode 283, thereby improving the aerodynamic characteristics of the rotating airfoil 20.

[0170] Thus, even in the air supply device 14, which functions as a centrifugal fan, a rotating airfoil 20 with improved aerodynamic characteristics can be achieved.

[0171] (Other implementation methods)

[0172] The embodiments of the present invention have been described above, but these embodiments are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above embodiments, and appropriate modifications can be made to the above embodiments without departing from its spirit.

[0173] In the above-described embodiments and variations 1 to 3 (hereinafter referred to as "embodiments, etc."), the first rotating wing body side opposing electrode 271 is located opposite the first outer shell side opposing electrode 71 throughout the entire period of one rotation of the rotating wing body 20. Furthermore, the second rotating wing body side opposing electrode 281 is located opposite the second outer shell side opposing electrode 81 throughout the entire period of one rotation of the rotating wing body 20.

[0174] However, the first rotor body-side opposing electrode may also be positioned opposite the first outer shell-side opposing electrode for at least a portion of the rotor body's rotation. Similarly, the second rotor body-side opposing electrode may be positioned opposite the second outer shell-side opposing electrode for at least a portion of the rotor body's rotation.

[0175] For example, in the above embodiment, the first rotor body-side opposing electrode 271 and the first outer shell-side opposing electrode 71 are circular in shape. However, the first rotor body-side opposing electrode and the first outer shell-side opposing electrode may also be fan-shaped.

[0176] Furthermore, in the above embodiments, the second rotating wing-side opposing electrode 281 and the second outer shell-side opposing electrode 81 are annular. However, the second rotating wing-side opposing electrode and the second outer shell-side opposing electrode may also be arc-shaped.

[0177] Furthermore, when the pairs of opposing electrodes on the first rotor body side and the first shell side are opposed for a portion of a period, and the pairs of opposing electrodes on the second rotor body side and the second shell side are opposed for a portion of a period, the opposition periods of the two pairs of opposing electrodes can also be synchronized. Alternatively, at least a portion of the opposition period of one pair of opposing electrodes can overlap with the opposition period of another pair of opposing electrodes.

[0178] By synchronizing or partially overlapping the periods during which the two pairs of opposing electrodes are opposed, a circuit can be formed by the first electrode, the first rotor body-side opposing electrode, the first outer shell-side opposing electrode, and the second electrode, the second rotor body-side opposing electrode, and the second outer shell-side opposing electrode.

[0179] Furthermore, the opposing electrodes on the first rotating wing body side and the opposing electrodes on the first outer shell side can also have different shapes.

[0180] In the above embodiment, the air supply device 11 includes a high-frequency, high-voltage supply unit 90. However, the air supply device may also lack a high-frequency, high-voltage supply unit. The air supply device can be electrically connected to a power supply device that includes a high-frequency, high-voltage supply unit. In this way, the air supply device can obtain a high-frequency, high-voltage power supply from an external power supply device.

[0181] In the above embodiments, air supply devices 11, 12, and 13 are axial flow fans. Furthermore, air supply device 14 is a centrifugal fan. However, the air supply device may also be an air supply device other than an axial flow fan or a centrifugal fan. For example, the air supply device may also be a diagonal flow fan that draws in air axially and exhausts it obliquely. Furthermore, the air supply device may have multiple moving blades. In the air supply device, the positions of the multiple moving blades can be arranged axially.

[0182] In the above embodiments, the rotating airfoil 20 is located inside the outer casing 40. However, at least a portion of the rotating airfoil may also protrude outward from one axial end face of the outer casing.

[0183] In the above embodiments and modifications 1 and 2, the air supply device 11, air supply device 12, and air supply device 13 have a rotating airfoil 20 serving as a stationary airfoil. However, the air supply device may not have a stationary airfoil. For example, in the air supply device, instead of the stationary airfoil described above, ribs may be used to support the retaining portion on the cylindrical portion.

[0184] In the above embodiments and variations, the first rotor-body-side opposing electrode 271 is located at the axial end 201 of the rotor 20. The first rotor-body-side opposing electrode 271 is located on the axial side surface of the end portion 22. However, the first rotor-body-side opposing electrode may also be located on the radially outer side surface of the axial end of the rotor. For example, the first rotor-body-side opposing electrode may also be located on the radially outer side surface of the cylindrical portion at the axial end of the rotor. Furthermore, the frame may also have an opposing portion that supports the first outer shell-side electrode at a position radially outer relative to the radially outer side surface of the cylindrical portion.

[0185] In the above-described embodiments and variations 2, the second rotor-body-side opposing electrode 281 is located at the axially opposite end 202 of the rotor-body 20. The second rotor-body-side opposing electrode 281 is located on the radially outer side of the axially opposite end 212 of the cylindrical portion 21. However, the second rotor-body-side opposing electrode may also be located on the axially opposite side of the rotor-body's axially opposite end. For example, the second rotor-body-side opposing electrode may also be located on the axially opposite side of the cylindrical portion at the axially opposite end of the rotor-body. Furthermore, the motor support portion may also have an opposing portion that supports the second housing-side electrode at a position relative to the axially opposite side of the cylindrical portion. For example, the base portion may include the opposing portion.

[0186] (Example of composition)

[0187] It should be noted that this technology can also be configured as follows.

[0188] (1) An air supply device comprising: a rotating airfoil having blades arranged circumferentially relative to a central axis extending axially; a motor for rotating the rotating airfoil about the central axis; and a housing supporting the motor and housing the rotating airfoil and the motor, wherein the air supply device comprises: a first housing-side opposing electrode and a second housing-side opposing electrode located on the housing surface of the housing, which are spaced apart from the rotating airfoil surface relative to the rotating airfoil; the first rotating airfoil-side opposing electrode located on the rotating airfoil surface and being opposed to the first housing-side opposing electrode for at least a portion of the period during which the rotating airfoil rotates one revolution. At least a portion of the opposing positions; a second rotor-body side opposing electrode, located on the surface of the rotor and positioned opposite at least a portion of the second outer shell side opposing electrode for at least a portion of the period during one revolution of the rotor; a first electrode, located on the surface of the blade and electrically connected to the first rotor-body side opposing electrode; and a second electrode, located on the surface of the blade in a manner arranged along the first electrode and electrically connected to the second rotor-body side opposing electrode, wherein the air supply device applies an alternating voltage to the first outer shell side opposing electrode and the second outer shell side opposing electrode, thereby generating plasma between the first electrode and the second electrode.

[0189] (2) In the air supply device described in (1), at least a portion of the first rotating wing body side opposing electrode is opposite to the first outer shell side opposing electrode during the entire period of one rotation of the rotating wing body, or at least a portion of the second rotating wing body side opposing electrode is opposite to the second outer shell side opposing electrode during the entire period of one rotation of the rotating wing body.

[0190] (3) In the air supply device described in (1) or (2), the rotating airfoil surface has: a first rotating airfoil surface located at one end of the axial direction of the rotating airfoil; and a second rotating airfoil surface located at the other end of the axial direction of the rotating airfoil, wherein the first rotating airfoil side opposing electrode is located on the first rotating airfoil surface and the second rotating airfoil side opposing electrode is located on the second rotating airfoil surface, and the outer shell surface has: a first outer shell surface located at a position opposite to the first rotating airfoil surface; and a second outer shell surface located at a position opposite to the second rotating airfoil surface, wherein the first outer shell side opposing electrode is located on the first outer shell surface and the second outer shell side opposing electrode is located on the second outer shell surface.

[0191] (4) In the air supply device described in (3), the rotating airfoil has: a cylindrical portion extending along the axial direction for arranging the blades; and an end portion located at one end of the cylindrical portion along the axial direction. The housing has: a receiving portion surrounding the radially outer side of the rotating airfoil and the motor; a frame located at one side of the receiving portion along the axial direction; and a motor support portion located at the other side of the receiving portion along the axial direction for supporting the motor. The frame has a first opposing portion disposed at a distance from the end portion on one side of the axial direction relative to the end portion and at least partially overlapping the end portion when viewed from the axial direction. The motor support portion has a second opposing portion disposed at a distance from the radially outer side of the other end of the cylindrical portion along the axial direction. The surface of the first rotating airfoil is included on one axial side of the end portion of the cylindrical portion. The surface of the first housing is included on the other axial side of the first opposing portion of the frame. The surface of the second rotating airfoil is included on the radially outer side of the other end of the cylindrical portion along the axial direction. The surface of the second housing is included on the radially inner side of the second opposing portion.

[0192] (5) In the air supply device described in (1) or (2), the rotating airfoil has: a cylindrical portion extending along the axial direction for arranging the blades; and an end portion located at one end of the cylindrical portion along the axial direction, the housing having: a receiving portion surrounding the radially outer side of the rotating airfoil and the motor; a frame located on one side of the receiving portion along the axial direction; and a motor support portion located on the other side of the receiving portion along the axial direction for supporting the motor, the frame having a first opposing portion disposed at a distance from the end portion on one side of the axial direction relative to the end portion and at least partially overlapping the end portion when viewed from the axial direction, the surface of the rotating airfoil being contained on one axial side of the end portion, and the surface of the housing being contained on the other axial side of the first opposing portion of the frame.

[0193] (6) In the air supply device described in (1) or (2), the rotating airfoil has a blade support extending along the axial direction for arranging the blade, and at least one end of the axial direction is cylindrical, the housing has: a receiving portion surrounding the radially outer side of the rotating airfoil and the motor; and a motor support portion located on the axially opposite side of the receiving portion for supporting the motor, the surface of the rotating airfoil being included on the radially outer side of the other axial end of the blade support portion, the motor support portion having a second opposing portion disposed at a distance from the radially outer side relative to the other axial end of the blade support portion, the surface of the housing being included on the radially inner side of the second opposing portion.

[0194] (7) In any one of (1) to (6) the air supply device further comprises a high-frequency high-voltage supply unit, which generates high-frequency high-voltage power that increases the frequency and voltage of the input AC power and supplies it to the first housing side counter electrode and the second housing side counter electrode.

[0195] The industrial availability is as follows.

[0196] This invention can be applied, for example, to air supply devices that rotate a rotor blade by the driving force of a motor.

Claims

1. An air supply device, comprising: A rotating airfoil having blades arranged circumferentially relative to a central axis extending along the axial direction; A motor causes the rotating airfoil to rotate about the central axis. as well as The housing supports the motor and accommodates the rotary airfoil and the motor. The air supply device includes: The first outer shell side opposing electrode and the second outer shell side opposing electrode are located on the outer shell surface of the outer shell, which are spaced apart from the rotor surface of the rotor body; The first rotating wing body side opposing electrode is located on the surface of the rotating wing body and is positioned opposite to at least a portion of the first outer shell side opposing electrode during at least a portion of the period during one revolution of the rotating wing body. The second rotating wing body side opposing electrode is located on the surface of the rotating wing body and is positioned opposite to at least a portion of the second outer shell side opposing electrode during at least a portion of the period during one revolution of the rotating wing body. The first electrode is located on the surface of the blade and is electrically connected to the opposing electrode on the side of the first rotating airfoil. as well as The second electrode, arranged along the first electrode on the surface of the blade, is electrically connected to the opposing electrode on the second rotating airfoil side. The air supply device applies an alternating voltage to the first housing-side opposing electrode and the second housing-side opposing electrode, thereby generating plasma between the first electrode and the second electrode.

2. The air supply device according to claim 1, wherein, At least a portion of the first rotating wing-side opposing electrode is opposed to the first outer shell-side opposing electrode throughout the entire duration of one revolution of the rotating wing, or... At least a portion of the second rotor body-side opposing electrode is opposed to the second outer shell-side opposing electrode throughout the entire period of one revolution of the rotor body.

3. The air supply device according to claim 1, wherein, The surface of the rotating airfoil has: The first rotating airfoil surface is located at one end of the rotating airfoil along its axial direction; and The second rotating airfoil surface is located at the other end of the rotating airfoil along its axial direction. The opposing electrode on the first rotating airfoil side is located on the surface of the first rotating airfoil. The second rotating airfoil side opposing electrode is located on the surface of the second rotating airfoil. The outer shell surface has: The first outer shell surface is located opposite the first rotating wing body surface; as well as The second outer shell surface is located opposite the second rotating wing body surface. The first housing-side opposing electrode is located on the surface of the first housing. The second housing side counter electrode is located on the surface of the second housing.

4. The air supply device according to claim 3, wherein, The rotating airfoil has: A cylindrical portion, extending along the axial direction, is provided for the arrangement of the blades; and The end face, located on one side of the axial direction of the cylindrical portion. The outer casing has: A housing that surrounds the radially outer side of the rotating airfoil and the motor; A frame, located on one side of the axial direction of the receiving portion; and The motor support portion, located on the opposite side of the axial direction of the receiving portion, supports the motor. The frame has a first opposing portion, which is disposed at a distance from the end face on one side of the axial direction and at least partially overlaps with the end face when viewed from the axial direction. The motor support portion has a second opposing portion, which is disposed radially outward at a distance relative to the axially opposite end of the cylindrical portion. The surface of the first rotating airfoil is included on one axial side of the end portion of the cylindrical section. The first outer shell surface is contained on the other axial side of the first opposing portion of the frame. The second rotating airfoil surface is included on the radially outer side of the other end of the cylindrical portion. The second outer casing surface is contained within the radially inner side surface of the second opposing portion.

5. The air supply device according to claim 1, wherein, The rotating airfoil has: A cylindrical portion, extending along the axial direction, is provided for the arrangement of the blades; and The end face, located on one side of the axial direction of the cylindrical portion. The outer casing has: A housing that surrounds the radially outer side of the rotating airfoil and the motor; A frame, located on one side of the axial direction of the receiving portion; and The motor support portion, located on the opposite side of the axial direction of the receiving portion, supports the motor. The frame has a first opposing portion, which is disposed at a distance from the end face on one side of the axial direction and at least partially overlaps with the end face when viewed from the axial direction. The surface of the rotating airfoil is included on one axial side of the end face. The outer shell surface is contained on the other axial side of the first opposing portion of the frame.

6. The air supply device according to claim 1, wherein, The rotating airfoil has a blade support extending along the axial direction for arranging the blades, and at least one end along the axial direction is cylindrical. The outer casing has: A housing portion, surrounding the radially outer side of the rotating airfoil and the motor; and The motor support portion, located on the opposite side of the axial direction of the receiving portion, supports the motor. The surface of the rotating airfoil is included on the radially outer side of the other end of the blade support. The motor support portion has a second opposing portion, which is disposed radially outward at a distance relative to the axially opposite end of the blade support portion. The outer shell surface is contained within the radially inner side of the second opposing portion.

7. The air supply device according to any one of claims 1 to 6, wherein, It also has a high-frequency high-voltage supply unit, which generates high-frequency high-voltage power that amplifies the frequency and voltage of the input AC power and supplies it to the first housing-side counter electrode and the second housing-side counter electrode.

Images