Air supply device

Abstract

The present application provides an air supply device. The air supply device has a base portion, a motor mounted to the base portion, a first impeller rotated by the motor, and a second impeller rotated by the motor and independent of the first impeller. The base portion has a ring-shaped cover portion covering at least a portion of the motor, a support portion extending from an upper end of the cover portion, and a bottom portion extending inward from a lower end of the cover portion, the bottom portion having a stator fixed thereto. The bottom portion has a shaft hole configured to have a shaft passing therethrough. The first impeller and the second impeller are respectively mounted to upper and lower portions of a rotor. At least one of the first impeller and the second impeller is fixed to the shaft.

Description

Technical Field

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

[0002] In the past, in order to improve air delivery and cooling performance, fan motors with air intake holes formed on the two sides of the housing separated by the fan have been proposed (for example, see Patent Document 1).

[0003] Patent Document 1: Japanese Patent Application Publication No. 2000-283089

[0004] In the aforementioned conventional fan motors, an air intake on one side of the housing is fitted with a bearing tube that holds the drive unit that rotates the fan, and ribs that support the bearing tube. This narrows the air intake, resulting in reduced airflow and increased noise. Furthermore, to obtain sufficient airflow, the air intake needs to be enlarged, leading to a larger fan motor. Summary of the Invention

[0005] Therefore, the object of the present invention is to provide an air supply device that can increase air volume without increasing its size.

[0006] An exemplary air supply device of the present invention includes: a base portion; a motor mounted on the base portion; a first impeller that rotates via the motor; and a second impeller that rotates via the motor and is independent of the first impeller. The motor includes: a rotor having a shaft that rotates around a vertically extending central axis; a stator fixed to the base portion and radially opposite the rotor; and a bearing portion fixed to the stator, supporting the rotor for rotation. The base portion includes: an annular cover portion covering at least a portion radially of the motor about the central axis; a support portion extending outward from the upper end of the cover portion; and a bottom portion extending inward from the lower end of the cover portion, the stator being fixed to the bottom portion. The bottom portion has a shaft hole configured for the shaft to pass through, the first impeller and the second impeller being mounted on the upper and lower portions of the rotor respectively, and at least one of the first impeller and the second impeller being fixed to the shaft.

[0007] The exemplary air supply device according to the present invention can increase the air volume without increasing its size. Attached Figure Description

[0008] Figure 1 This is a perspective view of an air supply device according to one embodiment.

[0009] Figure 2 It is shown that... Figure 1 The shown is a partial cross-sectional view of a section obtained by cutting off the air supply device.

[0010] Figure 3 It is an exploded 3D view of the air supply device.

[0011] Figure 4 This is a 3D view of the air supply unit.

[0012] Figure 5 This is an exploded 3D view of the air supply unit.

[0013] Label Explanation

[0014] A: Air supply device; 100: Air supply unit; 10: Outer shell; 11: Container section; 110: Outlet; 111: Base plate; 112: Long plate section; 113: Short plate section; 12: Cover section; 14: First air intake port; 15: Second air intake port; 20: Base section; 21: Cover section; 22: Support section; 23: Bottom; 231: Shaft hole; 30: Motor; 31: Rotor; 310: Shaft; 311: Rotor housing; 312: Rotor magnet; 313: Cover section; 314: Cylindrical section; 315: Shaft fixing section; 32: Stator; 321: Stator core; 3 22: Insulating component; 323: Sleeve; 324: Through hole; 325: Tooth; 33: Bearing part; 34: Circuit board; 40: First impeller; 41: First base plate; 42: First blade; 421: Circular component; 43: First impeller cup; 431: Impeller cover; 432: Outer cylinder; 433: Inner cylinder; 50: Second impeller; 51: Second base plate; 52: Second blade; 521: Circular component; 53: Second impeller cup; 531: Impeller bottom; 532: Cylinder; 533: Fixing part; 54: Shaft fixing component; Cx: Central axis. Detailed Implementation

[0015] Hereinafter, a motor unit according to an embodiment of the present invention will be described with reference to the accompanying drawings. Furthermore, the scope of the present invention is not limited to the following embodiments, and modifications can be made freely within the scope of the technical concept of the present invention.

[0016] In this specification, the direction parallel to the central axis Cx of the motor 30 is referred to as the "axial direction". Figure 1 Using the state of the motor 30 shown as a reference, the upper part is taken as one axial direction, and the lower part as the other axial direction. The radial direction perpendicular to the central axis Cx is simply referred to as "radial," and the circumferential direction centered on the central axis Cx is simply referred to as "circumferential." Furthermore, in this specification, "parallel direction" includes not only the case of perfect parallelism but also the case of approximately parallel directions. Moreover, "extending along a specified direction or plane" includes not only the case of extending strictly along a specified direction but also the case of extending along a direction inclined within a range of less than 45° relative to the strictly specified direction.

[0017] <Air Supply Device A>

[0018] Hereinafter, an exemplary embodiment of the air supply device A of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a perspective view of an air supply device A according to one embodiment. Figure 2 It is shown that... Figure 1 The shown is a partial cross-sectional view of a section obtained by cutting off the air supply device A with the cut surface PL. Figure 3 This is an exploded perspective view of the air supply device A. Furthermore, the figures used in this embodiment are conceptual diagrams. The configuration and dimensions of the various parts shown in each figure are not limited to the actual air supply device A.

[0019] like Figure 1 , Figure 2 As shown, the air supply device A has a housing 10, a base 20, a motor 30, a first impeller 40, and a second impeller 50. The base 20 is formed of the same material as the housing 10. The motor 30, the first impeller 40, and the second impeller 50 are mounted on the base 20. In the following description, the structure in which the motor 30, the first impeller 40, and the second impeller 50 are mounted on the base 20 is sometimes referred to as the air supply unit 100. Figure 4 This is a 3D view of the air supply unit 100. Figure 5 This is an exploded perspective view of the air supply unit 100.

[0020] <Shell 10>

[0021] like Figure 1 As shown, the outer casing 10 is a rectangular box. One end of the outer casing 10 is open along its length. This opening is an outlet 110 for discharging airflow generated internally. Figure 2 , Figure 3 As shown, an air supply unit 100 is arranged inside the housing 10. That is, the base 20, the motor 30, the first impeller 40, and the second impeller 50 are arranged inside the housing 10.

[0022] The outer casing 10 has a container portion 11 and a cover portion 12. The container portion 11 has a base plate 111 that is rectangular when viewed from the axial direction. Furthermore, the container portion 11 has a pair of long plate portions 112 that extend upward from the two long sides of the base plate 111, and a short plate portion 113 that extends upward from one of the short sides.

[0023] like Figure 3As shown, a second air intake 15 extending through the thickness direction is formed in the base plate 111. Viewed axially, the second air intake 15 is circular. Airflow is generated by the rotation of the second impeller 50, thereby drawing air into the interior of the outer casing 10 through the second air intake 15. Furthermore, the shape of the second air intake 15 viewed axially is not limited to circular; elliptical, polygonal (quadrilateral, hexagonal, etc.), and combinations thereof can be widely used to draw in air. Additionally, a filter can be provided to suppress the ingress of foreign matter.

[0024] like Figure 2 As shown, the cover 12 and the base plate 111 are arranged vertically opposite each other. Furthermore, the cover 12 is fixed to the upper ends of a pair of long plate portions 112 and short plate portions 113. While screws can be used to fix the cover 12, it is not limited to this method; for example, pressing-in or claw-based fixing methods can be employed. A wide range of methods can be used to securely fix the cover 12 to the long plate portions 112 and short plate portions 113.

[0025] like Figure 1 , Figure 3 As shown, a first air intake 14 extending through the thickness direction is formed in the cover portion 12. Viewed axially, the first air intake 14 is circular. Airflow is generated by the rotation of the first impeller 40, thereby drawing air into the interior of the outer casing 10 through the first air intake 14. Furthermore, the shape of the first air intake 14 viewed axially is not limited to circular; elliptical, polygonal (quadrilateral, hexagonal, etc.), and combinations thereof can be widely used to draw in air. Additionally, a filter (not shown) can be provided to suppress the ingress of foreign matter.

[0026] <Base Section 20>

[0027] like Figures 2-5 As shown, the base portion 20 has a cover portion 21, a support portion 22, and a bottom portion 23. The cover portion 21 is annular about the central axis Cx and covers at least a portion of the radial direction of the motor 30. In the air supply device A of this embodiment, the cover portion 21 is cylindrical about the central axis Cx. Furthermore, the cover portion 21 approaches the central axis Cx downwards. To further explain, the cover portion 21 is conical. However, the cover portion 21 is not limited to a conical shape and may also be cylindrical.

[0028] The support portion 22 is flat. The support portion 22 extends radially outward from the upper end of the cover portion 21. The bottom portion 23 is flat. The bottom portion 23 extends inward from the lower end of the cover portion 21. The stator 32 of the motor 30, which will be described later, is fixed to the bottom portion 23.

[0029] like Figure 2As shown, the bottom 23 has an axially extending shaft hole 231 (see reference). Figure 2 The shaft 310 of the motor 30, described later, is configured to pass through the shaft hole 231. Furthermore, in the air supply device A of this embodiment, the cover 21, support 22, and bottom 23 of the base 20 are integrally formed, but this is not a limitation. For example, the cover 21, support 22, and bottom 23 may be formed as separate components and fixed separately.

[0030] In the air supply device A of this embodiment, the support portion 22 of the base portion 20 is fixed to the outer casing 10. Thus, the base portion 20 is held to the outer casing 10. Alternatively, the support portion 22 can be fixed to the outer casing 10 by clamping it with protrusions formed on the base plate 111 and the cover portion 12. Alternatively, ribs can be formed on the outer periphery of the support portion 22 and bonded to the inner peripheral surface of the outer casing 10. Furthermore, even with methods other than these, fixing methods capable of stably fixing the support portion 22 to the outer casing 10 can be widely adopted.

[0031] <Motor 30>

[0032] like Figure 2 , Figure 5 As shown, the motor 30 has a rotor 31, a stator 32, two bearing sections 33, and a circuit board 34. The motor 30 is a so-called external rotor type brushless DC motor, with the rotor 31 facing the radial outer surface of the stator 32. By using an external rotor motor as the motor 30, a larger torque can be generated compared to using an internal rotor motor, thereby increasing the air volume of the air supply device A.

[0033] like Figure 2 As shown, the rotor 31 has a shaft 310 that rotates around a central axis Cx extending vertically. In addition, in the motor 30 of this embodiment, the shaft 310 is cylindrical, but it is not limited to this. As long as sufficient rigidity can be ensured, it can also be cylindrical.

[0034] <Rotor 31>

[0035] The rotor 31 has a rotor housing 311 and a rotor magnet 312. The rotor housing 311 is a covered cylindrical shape made of magnetic material, having a cover portion 313 and a cylindrical portion 314. The cover portion 313 has a shaft fixing portion 315 at its center. The shaft fixing portion 315 is cylindrical, extending axially upward from the edge of a through hole formed in the center of the cover portion 313. The shaft 310 is fixed to the inner circumferential surface of the shaft fixing portion 315. That is, the rotor housing 311 is fixed to the shaft 310.

[0036] Furthermore, the shaft 310 and the shaft fixing part 315 are fixed by press-fitting. However, the fixing method is not limited to press-fitting; various fixing methods such as bonding, welding, and threaded fastening can be used to securely fix the shaft 310 and the shaft fixing part 315 without hindering the rotation of the shaft 310. By fixing the shaft 310 to the shaft fixing part 315, the shaft 310 and the rotor 31 are fixed.

[0037] The cylindrical portion 314 is cylindrical and extends downward along the axial direction from the radial outer edge of the cover portion 313. A rotor magnet 312 is fixed on the inner circumferential surface of the cylindrical portion 314. The rotor magnet 312 is cylindrical. The rotor housing 311 is cylindrical and holds the rotor magnet 312 on its inner circumferential surface. Furthermore, the rotor magnet 312 is arranged radially outward of the stator 32.

[0038] The rotor magnet 312 has N poles and S poles arranged alternately on its inner circumferential surface. In this embodiment, the rotor magnet 312 is cylindrical, but it is not limited to this. For example, it may also be a structure in which a plurality of plate-shaped magnets are arranged circumferentially on a cylindrical rotor core.

[0039] <Stator 32>

[0040] like Figure 2 , Figure 5 As shown, the stator 32 is arranged radially inward of the rotor 31, and is radially opposed to the rotor 31. Further explanation: the stator 32 includes a stator core 321, an insulator 322, a coil (not shown), and a sleeve 323. The stator core 321 is a laminate formed by stacking electromagnetic steel sheets axially. However, the stator core 321 is not limited to a laminate formed by stacking electromagnetic steel sheets; for example, it can also be a single component such as powder sintering or casting.

[0041] The stator core 321 has a through hole 324 centered on the central axis Cx. Additionally, the stator core 321 has multiple teeth 325. These teeth 325 extend radially outward. The teeth 325 are arranged at equal intervals circumferentially. The radial outer edge of the teeth 325 has a circumferentially expanding shape. By forming this shape, magnetic flux from the rotor magnet 312 can be efficiently received, and the coils are less likely to detach radially outward.

[0042] The insulating element 322 is formed of, for example, an insulating material such as resin, and at least covers the teeth. Figure 2 As shown, a coil is formed by winding a wire around the teeth 325 covered by the insulating element 322. Three systems of current with different phases (hereinafter referred to as three phases) are supplied to the coil.

[0043] The insulating member 322 electrically insulates the stator core 321 from the coil. Furthermore, the insulating member 322 is not limited to resin; a wide range of materials capable of insulating the stator core 321 from the coil can be used. For example, if the conductor is insulated from the stator core 321 by providing an insulating coating, the insulating member 322 may be omitted.

[0044] The sleeve 323 is cylindrical. The lower end of the sleeve 323 is inserted into the shaft hole 231 located in the bottom 23 of the base portion 20. Thus, the sleeve 323 is fixed to the bottom 23. Further explanation: the center of the sleeve 323 fixed to the bottom 23 overlaps with the central axis Cx. Furthermore, the sleeve 323 is fixed by pressing it into the shaft hole 231, but is not limited to this method. For example, as a fixing method, methods such as bonding, welding, and threaded fastening can be widely used to securely fix the sleeve 323 to the bottom 23 with the central axis Cx as the center.

[0045] The sleeve 323 is fixed to the through hole 324 of the stator core 321. In other words, the stator core 321 is fixed to the outer circumferential surface of the sleeve 323. Alternatively, the stator core 321 and the sleeve 323 can be fixed by insertion and bonding, but this is not a limitation. For example, methods such as press-fitting, welding, and threaded fastening can be widely used to securely fix the stator core 321 to the sleeve 323. Furthermore, the stator core 321 and the sleeve 323 can also be fixed by a fixing component.

[0046] According to the above structure, the stator 32 is fixed to the base portion 20 and is radially opposed to the rotor 31.

[0047] <Bearing Section 33>

[0048] Two bearing portions 33 are axially spaced apart inside the sleeve 323. Each bearing portion 33 is a ball bearing, with its outer ring fixed to the inner surface of the sleeve 323 and its inner ring fixed to a shaft 310. Thus, the shaft 310 is supported by the sleeve 323 fixed to the base portion 20, allowing it to rotate about the central axis Cx. One bearing portion 33 is positioned higher than the base portion 20, and the other bearing portion 33 is positioned lower than the base portion 20. That is, the two bearing portions 33 are axially separated, thus suppressing the tilt of the shaft 310 relative to the central axis Cx.

[0049] Alternatively, at least one of the two bearing portions 33 may be arranged in a position that radially overlaps with the base portion 20. Furthermore, the bearing portions 33 are not limited to two, as long as they are sufficient to stably support the shaft 310. That is, the bearing portions 33 are fixed to the stator 32, supporting the rotor 31 so that it can rotate. Alternatively, the bearing portion may be a sleeve bearing.

[0050] In the motor 30, a sleeve 323 is fixed to the bottom 23 of the base portion 20, and a stator 32 is fixed to the outer surface of the sleeve 323. Furthermore, a shaft 310 is rotatably supported on the sleeve 323 via a bearing portion 33. That is, at least a portion of the rotor housing 311 is disposed radially inward of the cover portion 21 and is radially opposed to the cover portion 21. The motor 30 is thus mounted on the base portion 20. At this time, the lower part of the rotor housing 311 of the rotor 31 is disposed radially inward of the cover portion 21 of the base portion 20 and is radially opposed to the cover portion 21.

[0051] <Circuit Board 34>

[0052] Circuit board 34 is disposed axially below stator 32. Patterned wiring is formed on circuit board 34. Furthermore, electronic components are disposed on circuit board 34, and a circuit using electronic components is formed using the patterned wiring. Additionally, circuit board 34 can be, for example, a power supply circuit that provides power to the coil. Other circuits may also be formed. The coil is connected to circuit board 34 via a busbar (not shown).

[0053] Circuit board 34 is disposed radially inward of cover 21. A wire (not shown) connected to an externally located control circuit (not shown) is routed on circuit board 34. This wire is routed along the surface of support portion 22 of base portion 20 and through the gap between cover 21 and motor 30 onto circuit board 34. Because cover 21 is formed in a conical shape, a gap is created between cover 21 and rotor housing 311, facilitating wire handling. Furthermore, to facilitate wire routing, the axial gap between the first impeller 40 and base portion 20 can be wider than the axial gap between the second impeller 50 and base portion 20. Alternatively, these gaps can be the same without interfering with the wires.

[0054] In motor 30, current is sequentially supplied to multiple coils, and each coil is energized in turn. Through the magnetic force generated between the coils and rotor magnet 312, shaft 310 and rotor 31 rotate together around the central axis Cx.

[0055] <First impeller 40 and second impeller 50>

[0056] Figures 2-5 As shown, the first impeller 40 is a centrifugal impeller that draws in air from one end along the axial direction and blows it outward in a radial direction. The first impeller 40 has a first base plate 41, multiple first blades 42, and a first impeller cup 43.

[0057] The first substrate 41 is annular in shape. The first substrate 41 is perpendicular to the central axis Cx. Multiple first blades 42 are mounted on the first substrate 41. Further explanation: the first blades 42 extend upward along the axial direction from the upper surface of the first substrate 41. The multiple first blades 42 are arranged at equal intervals in the circumferential direction. Additionally, an annular member 421 is mounted at the upper end of each first blade 42. By mounting the annular member 421, the rigidity of the first blade 42 can be improved. Therefore, the first blade 42 is less prone to bending due to airflow, thus improving airflow efficiency. Alternatively, if the rigidity of the first blade 42 is high, the annular member 421 can be omitted.

[0058] The first impeller cup 43 is a covered cylindrical shape. Furthermore, the first impeller cup 43 has an opening at its lower part, and the first substrate 41 extends radially outward beyond the lower end of the first impeller cup 43. The centerline of the first impeller cup 43 overlaps with the centerline of the first substrate 41. That is, the first substrate 41 and the first impeller cup 43 are integrally formed, and the lower part of the first impeller cup 43 has an opening.

[0059] The first impeller cup 43 functions as a guide for directing the air drawn in by the first impeller 40. The outer surface of the first impeller cup 43 is smoothly formed, so that the airflow is not easily disturbed on the surface of the first impeller cup 43.

[0060] The first impeller cup 43 has an impeller cover portion 431, an outer cylinder portion 432, and an inner cylinder portion 433. The impeller cover portion 431 is a circular plate extending in a direction perpendicular to the central axis Cx. The outer cylinder portion 432 extends downward from the outer edge of the impeller cover portion 431 along the central axis Cx. To further explain, the outer cylinder portion 432 moves away from the central axis Cx as it faces downward. The lower end of the outer cylinder portion 432 is integrally connected to the inner peripheral end of the first substrate 41.

[0061] The inner cylinder portion 433 is cylindrical and coaxial with the outer cylinder portion 432. The inner cylinder portion 433 is integrally formed with the impeller cover portion 431 and extends downward from the lower surface of the impeller cover portion 431 along the central axis Cx. The rotor housing 311 of the rotor 31 of the motor 30 is fixed to the inner circumferential surface of the inner cylinder portion 433. That is, the first impeller 40 is fixed to the rotor housing 311. Thus, the first impeller 40 is mounted on the motor 30.

[0062] In addition, the inner cylinder 433 and the rotor housing 311 are fixed, for example, by pressing. However, the method of fixing the inner cylinder 433 and the rotor housing 311 is not limited to pressing, and a wide range of fixing methods such as bonding, fusion, and welding can be used to firmly fix the inner cylinder 433 and the rotor housing 311.

[0063] With this configuration, a portion of the rotor housing 311 of the motor 30 is positioned radially inward of the first impeller 40. This allows the air supply device A to be made thinner and smaller without reducing its air supply capacity.

[0064] The second impeller 50 is a centrifugal impeller that draws in air from the opposite end along the axial direction and blows it outward in a radial direction. The second impeller 50 has a second base plate 51, multiple second blades 52, and a second impeller cup 53.

[0065] In the second impeller 50, the second substrate 51 and the second blade 52 have the same shape as the first substrate 41 and the first blade 42 of the first impeller 40. Therefore, detailed descriptions of the second substrate 51 and the second blade 52 are omitted. In addition, a ring member 521 is fixed to the lower end of the second blade 52 in the same manner as the first blade 42.

[0066] The second impeller cup 53 is cylindrical with a bottom. Furthermore, the second impeller cup 53 has an opening at its top, and the second substrate 51 extends radially outward beyond the upper end of the second impeller cup 53. The centerline of the second impeller cup 53 overlaps with the centerline of the second substrate 51. That is, the second substrate 51 and the second impeller cup 53 are integrally formed, and the second impeller cup 53 has an opening at its upper part.

[0067] The second impeller cup 53 functions as a guide for directing the air drawn in by the second impeller 50. The outer surface of the second impeller cup 53 is smoothly formed, so the airflow is not easily disturbed on the surface of the second impeller cup 53.

[0068] like Figures 2-5 As shown, the second impeller cup 53 has an impeller bottom 531, a cylindrical portion 532, and a fixing portion 533. The impeller bottom 531 is a circular plate extending in a direction perpendicular to the central axis Cx. The cylindrical portion 532 extends upward from the outer edge of the impeller bottom 531 along the central axis Cx. Furthermore, the upper end of the cylindrical portion 532 is integrally connected to the inner peripheral end of the second base plate 51.

[0069] A fixing part 533 is provided at the impeller bottom 531. The fixing part 533 is cylindrical and extends axially from the impeller bottom 531. A shaft 310 is fixed to the fixing part 533. In the second impeller 50 of this embodiment, the fixing part 533 and the impeller bottom 531 are integral. That is, the second impeller 50 is directly fixed to the shaft 310. However, it is not limited to this, and the fixing part 533 and the impeller bottom 531 may be separately formed and installed on the impeller bottom 531.

[0070] The fixing part 533 and the shaft 310 are fixed, for example, by pressing. However, the method of fixing the fixing part 533 and the shaft 310 is not limited to pressing, and a wide range of fixing methods such as bonding, fusion, and welding can be used to firmly fix the fixing part 533 and the shaft 310.

[0071] <Air Supply Unit 100>

[0072] Next, the structure of the air supply unit 100 will be described. In the air supply unit 100, the sleeve 323 of the motor 30 is fixed to the bottom 23 of the base portion 20, and the stator 32 is fixed to the outer surface of the sleeve 323. Furthermore, the shaft 310 is rotatably supported on the sleeve 323 via a bearing portion 33. The motor 30 is thus mounted on the base portion 20. At this time, the lower part of the rotor housing 311 of the rotor 31 is arranged radially inward of the cover portion 21 of the base portion 20 and is radially opposed to the cover portion 21. That is, at least a portion of the rotor housing 311 is arranged radially inward of the cover portion 21 and is radially opposed to the cover portion 21. This suppresses axial height, thereby increasing the impeller height and improving airflow characteristics.

[0073] In the air supply unit 100, the upper part of the rotor housing 311 protrudes upward beyond the support portion 22. A first impeller 40 is fixed to the portion of the rotor housing 311 that protrudes upward beyond the support portion 22. Thus, the first impeller 40 is fixed to the rotor 31 with a gap between it and the support portion 22.

[0074] Furthermore, the shaft 310 of the motor 30 protrudes downwards from the bottom 23 of the base portion 20. A second impeller 50 is fixed to the portion of the shaft 310 that protrudes downwards from the bottom 23. Figure 5 As shown, a portion of the cover 21 is disposed radially inward of the second impeller cup 53 of the second impeller 50. That is, the second blade 52 of the second impeller 50 is disposed radially outward of the cover 21, and at least a portion of it overlaps the cover 21 radially.

[0075] Thus, in the air supply device A, the first impeller 40 and the second impeller 50 are fixed to the upper and lower parts of the rotor 31, respectively. Specifically, the first impeller 40 is fixed to the rotor 31 by the inner cylinder portion 433, which is fixed to the rotor housing 311. Furthermore, the second impeller 50 is fixed to the shaft 310 by the fixing portion 533.

[0076] In addition, such as Figure 2 As shown, when the second impeller 50 is fixed to the shaft 310, the gap between the impeller bottom 531 of the second impeller cup 53 of the second impeller 50 and the bottom 23 of the base portion 20 is set to t1. Furthermore, the gap between the cylindrical portion 532 of the second impeller cup 53 of the second impeller 50 and the cover portion 21 of the base portion 20 is set to t2. Moreover, the gap between the second base plate 51 of the second impeller 50 and the support portion 22 of the base portion 20 is set to t3. At this time, gap t3 is larger than both gap t1 and gap t2.

[0077] During startup, emergency stop, and other situations where the motor 30 oscillates, the displacement is smaller near the central axis Cx and increases further away. That is, when the motor 30 oscillates, the displacement of the second base plate 51 is greater than the displacement of the second impeller cup 53. This eliminates the need for replacement. By making the gap t3 larger than the gaps t1 and t2, contact between the second impeller 50 and the base portion 20 can be suppressed even when the motor 30 oscillates.

[0078] Furthermore, gaps t1, t2, and t3 are the lengths by which the impeller bottom 531 and bottom 23, the cylinder 532 and cover 21, and the second base plate 51 and support 22 do not contact each other when the motor 30 oscillates. To further explain, gaps t1, t2, and t3 can also be formed such that the further away from the central axis Cx, the larger they become. In particular, a higher efficiency can be achieved in gap t3, which is farthest from the central axis Cx.

[0079] Alternatively, both the first impeller 40 and the second impeller 50 can be directly fixed to the shaft 310. That is, in the air supply device A, at least one of the first impeller 40 and the second impeller 50 is fixed to the shaft 310.

[0080] The base portion 20 is positioned relative to the bottom plate 111, the long plate portion 112, and the short plate portion 113 of the outer casing 10 and is disposed inside the outer casing 10. Consequently, the second air intake 15 formed on the bottom plate 111 is disposed below the second impeller 50. That is, the second air intake 15 is disposed below the second impeller 50 and is axially opposed to the second impeller 50. Furthermore, the first impeller 40 and the second impeller 50 are disposed radially spaced from the inner wall surfaces of the long plate portion 112 and the short plate portion 113 of the container portion 11.

[0081] Furthermore, the cover 12 is mounted on the upper part of the container section 11. By mounting the cover 12, the first air intake 14 formed on the cover 12 is positioned above the first impeller 40. That is, the first air intake 14 is positioned above the first impeller 40 and is axially opposed to the first impeller 40. In this state, the cover 12 is fixed to the long plate section 112 and the short plate section 113 of the container section 11. Additionally, the base section 20 is fixed to the outer casing 10.

[0082] In the air supply device A thus formed, the first impeller 40 and the second impeller 50 rotate together with the rotor 31 by operating the motor 30. That is, the air supply device A has: a first impeller 40, which rotates by the motor 30; and a second impeller 50, which rotates by the motor 30 and is independent of the first impeller 40.

[0083] Air is drawn in through the first intake port 14 by the rotation of the first impeller 40. Further explanation is provided: the rotation of the first impeller 40, which functions as a centrifugal impeller, generates an airflow directed radially outward. The airflow generated by the first impeller 40 flows along the inner surface of the casing 10 toward the outlet port 110.

[0084] Similarly, air is drawn in from the second intake port 15 by the rotation of the second impeller 50. To further explain, the rotation of the second impeller 50, which functions as a centrifugal impeller, generates an airflow directed radially outward. The airflow generated by the second impeller 50 flows along the inner surface of the casing 10 toward the outlet port 110.

[0085] By incorporating multiple air intakes into the air supply device A, the total area of ​​all air intakes in A can be increased. This, in turn, increases the airflow compared to a system where the air intake has ribs for holding the motor.

[0086] In the air supply device A, the distance between the support portion 22 of the base portion 20 and the base plate 111 is approximately equal to the distance between the support portion 22 of the base portion 20 and the cover portion 12. Therefore, the flow path area of ​​the airflow generated by the first impeller 40 is approximately the same as the flow path area of ​​the airflow generated by the second impeller 50.

[0087] The first impeller 40 and the second impeller 50 are symmetrical in shape, separated by the support portion 22 of the base portion 20. That is, the first impeller 40 and the second impeller 50 have the same outer diameter.

[0088] Therefore, the air delivery capacities of the first impeller 40 and the second impeller 50 are approximately equal. With this configuration, the airflow velocity generated by the first impeller 40 is approximately equal to the airflow velocity generated by the second impeller 50. As a result, when the airflow from the first impeller 40 and the airflow from the second impeller 50 merge at the end of the base portion 20, turbulence is less likely to occur. This helps to suppress noise and vibration.

[0089] Furthermore, the first impeller 40 and the second impeller 50 can be of different sizes. For example, the first impeller 40 and the second impeller 50 can have different shapes and different axial heights.

[0090] For example, if the distance from the base portion 20 to the first intake port 14 is longer than the distance from the base portion 20 to the second intake port 15, an impeller with an axial length longer than the second impeller 50 is used as the first impeller 40. By adjusting in this way, the airflow velocity from the first impeller 40 is approximately the same as the airflow velocity from the second impeller 50. Similarly, if the opening area of ​​the first intake port 14 is smaller than the opening area of ​​the second intake port 15, an impeller with an outer diameter smaller than the second impeller 50 is used as the first impeller 40. Even in this case, the airflow velocity from the first impeller 40 is approximately the same as the airflow velocity from the second impeller 50.

[0091] The airflow of the first impeller 40 and the second impeller 50 varies depending on the size of the first impeller cup 43 and the second impeller cup 53. Therefore, when the first impeller 40 and the second impeller 50 have different shapes, the first impeller cup 43 of the first impeller 40 and the second impeller cup 53 of the second impeller 50 can also be different sizes. Alternatively, they can have structures with different shapes.

[0092] In the air supply device A, one motor 30 is used to rotate two impellers, the first impeller 40 and the second impeller 50. Since there is only one motor 30, the number of bearings can be reduced compared to using multiple motors. This simplifies the structure of the air supply device A.

[0093] The embodiments of the present invention have been described above. However, the structures and combinations thereof in the embodiments are merely examples, and additions, omissions, substitutions, and other modifications to the structures can be made without departing from the spirit of the present invention. Furthermore, the present invention is not limited to the embodiments described above.

[0094] Industrial availability

[0095] The structure of the present invention can be used as an air supply device for supplying air.

Claims

1. An air supply device, comprising: Base section; The motor is mounted on the base portion; The first impeller, which rotates via the motor; and The second impeller rotates via the motor and is independent of the first impeller. The motor has: A rotor having a shaft that rotates around a central axis extending vertically; A stator, fixed to the base portion, with its radially outer surface facing the rotor radially; and The bearing section, fixed to the stator, supports the rotor so that it can rotate. The base portion has: The cover is annular about the central axis and covers at least a portion of the radial direction of the motor; The support portion extends outward from the upper end of the cover portion; and The bottom, which extends inward from the lower end of the cover, is where the stator is fixed. The bottom has a shaft hole configured to allow the shaft to pass through it. The first impeller and the second impeller are respectively installed on the upper and lower parts of the rotor.

2. The air supply device according to claim 1, wherein, The cover moves downwards toward the central axis.

3. The air supply device according to claim 2, wherein, The blades of the second impeller are arranged radially outward of the shroud, and at least a portion of the blades of the second impeller overlaps the shroud radially.

4. The air supply device according to claim 2 or 3, wherein, The rotor has: Rotor magnets, which are arranged radially outward of the stator; and The rotor housing is cylindrical and holds the rotor magnets on its inner circumferential surface. The rotor housing is fixed to the shaft.

5. The air supply device according to claim 4, wherein, At least a portion of the rotor housing is disposed radially inward of the cover and is radially opposite to the cover.

6. The air supply device according to claim 4, wherein, The first impeller is fixed to the rotor housing, and the second impeller is directly fixed to the shaft.

7. The air supply device according to claim 1 or 2, wherein, The air supply device has a housing, inside which the base, the motor, the first impeller, and the second impeller are disposed. The outer casing has: A first intake port is disposed above the first impeller and is axially opposed to the first impeller; and The second intake port is located below the second impeller and is axially opposite to the second impeller.

8. The air supply device according to claim 1 or 2, wherein, The first impeller and the second impeller have the same outer diameter.

9. The air supply device according to claim 8, wherein, The impeller cups of the first impeller and the second impeller are of different sizes.

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