Air supply device and dust collector

Abstract

The invention provides an air supply device and a dust collector. An air blower includes an impeller, a motor, and an outer case covering the impeller from outside in a radial direction and covering at least an upper end portion of the motor from outside in a radial direction, the motor includes a rotor, a stator, and an inner case covering the rotor and the stator, and the rotor includes a shaft protruding toward an upper outer side of the inner case. The impeller is fixed to the upper end portion of the shaft and rotates together with the shaft to allow fluid to flow from above to below, the inner shell is provided with a first inner shell covering the stator from above and covering the stator from outside in the radial direction and a second inner shell covering the stator from below, and the second inner shell is in contact with the first inner shell in the axial direction and the radial direction. The axial contact position of the first inner housing and the second inner housing is higher than the lower end position of the stator.

Description

Technical Field

[0001] The present invention relates to a blowing device and a vacuum cleaner. Background Art

[0002] Conventionally, a blowing device (motor) mounted on a wet / dry vacuum cleaner has been known. For example, such a blowing device is disclosed in Patent Document 1.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Specification of Chinese Patent Publication Gazette No. 114172305 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] When a blowing device is mounted on a wet / dry vacuum cleaner, if the waterproof property of the motor of the blowing device is insufficient, liquid may enter the inside of the motor, and it may be difficult to stably operate the motor. On the other hand, if the motor is covered with a housing to improve the waterproof property, the heat dissipation property of the motor is reduced. When the heat dissipation property of the motor is reduced, there is also a possibility that it is difficult to stably operate the motor.

[0008] An object of the present invention is to stably operate the motor of the blowing device.

[0009] Means for Solving the Problems

[0010] An exemplary blowing device of the present invention includes: an impeller that can rotate about a central axis extending vertically; a motor that rotates the impeller; and an outer housing that covers the impeller from the radially outer side and covers at least the upper end portion of the motor from the radially outer side. The motor has: a rotor that can rotate about the central axis; a stator that is disposed on the radially outer side of the rotor and rotates the rotor; and an inner housing that covers the rotor and the stator. The rotor has a shaft extending along the central axis. The axial inner housing protrudes outward above. The impeller is fixed to the upper end portion of the shaft and causes fluid to flow from above downward by rotating together with the shaft. The inner housing has: a first inner housing that is a covered cylindrical shape centered on the central axis, covers the stator from above, and covers the stator from the radially outer side; and a second inner housing that covers the stator from below. The second inner housing contacts the first inner housing in the axial direction and the radial direction. The axial contact position of the first inner housing and the second inner housing is a position above the lower end position of the stator.

[0011] An exemplary air supply device of the present invention includes: an impeller that can rotate about a central axis extending vertically; a motor that rotates the impeller; and an outer housing that covers the impeller from the radially outer side and covers at least the upper end portion of the motor from the radially outer side. The motor has: a rotor that can rotate about the central axis; a stator that is disposed radially outside the rotor and rotates the rotor; a circuit board that is connected to the stator and is equipped with electronic components; and an inner housing that covers the rotor and the stator. The rotor has a shaft extending along the central axis. The axial inner housing protrudes outward above. The impeller is fixed to the upper end portion of the shaft and causes fluid to flow from above downward by rotating together with the shaft. The inner housing has: a first inner housing that is a covered cylindrical shape centered on the central axis, covers the stator from above, and covers the stator from the radially outer side; a second inner housing that covers the stator from below; and a substrate cover. The circuit board is disposed below the second inner housing. The substrate cover covers the circuit board from below. The substrate cover has a cylindrical cover tube portion centered on the central axis. The upper end portion of the cover tube portion has a clamping portion. The lower end portion of the first inner housing has a clamped portion that is clamped radially by the clamping portion. The clamping portion has: a first clamping portion that is disposed radially inside the clamped portion; and a second clamping portion that is disposed radially outside the clamped portion. The upper end position of the first clamping portion is a position higher than the upper end position of the second clamping portion.

[0012] An exemplary vacuum cleaner of the present invention includes the above air supply device.

[0013] Advantages of the Invention

[0014] According to the exemplary air supply device and vacuum cleaner of the present invention, the motor of the air supply device can operate stably. Description of the Drawings

[0015] Figure 1 is a perspective view of the air supply device of the embodiment.

[0016] Figure 2 is an exploded perspective view of the air supply device of the embodiment.

[0017] Figure 3 is a sectional perspective view of the air supply device of the embodiment.

[0018] Figure 4 is a diagram schematically showing the flow path of the fluid attracted by the air supply device of the embodiment.

[0019] Figure 5 is a top view of the stator core of the embodiment observed from the axial direction.

[0020] Figure 6 is an exploded sectional perspective view of the inner housing of the embodiment.

[0021] Figure 7 It is a perspective view of the second inner housing of the embodiment.

[0022] Figure 8 It is a cross-sectional view of the motor of the embodiment.

[0023] Figure 9 It is an enlarged cross-sectional view of the lower bearing and its periphery of the embodiment.

[0024] Figure 10 It is an enlarged cross-sectional view of the clamping portion of the substrate cover of the embodiment and its periphery.

[0025] Figure 11 It is a perspective view of the vacuum cleaner of the embodiment.

[0026] Symbol Explanation

[0027] 1 - impeller, 2 - motor, 3 - inner housing, 4 - outer housing, 5 - heat dissipation component for substrate, 6 - heat dissipation component for stator, 10 - air supply device, 21 - rotor, 22 - stator, 30 - substrate cover, 31 - first inner housing, 32 - second inner housing, 100 - vacuum cleaner, 211 - shaft, 221 - stator core, 223 - coil, 300 - cover cylinder portion, 301 - clamping portion, 312 - clamped portion, 322 - bearing recess, 323 - guide, 2211 - back of core, 2212 - tooth, 3011 - first clamping portion, 3012 - second clamping portion, 3230 - guide surface, Bd - circuit board, Br2 - lower bearing, CA - central axis, F - fluid, MD - electronic component. Detailed Embodiment

[0028] Hereinafter, with reference to Figures 1 to 11 Exemplary embodiments of the present invention will be described.

[0029] In this specification, the direction in which the central axis CA of the air supply device 10 extends is referred to as the "axial direction", and the circumferential direction centered on the central axis CA is referred to as the "circumferential direction". In addition, the direction orthogonal to the central axis CA is referred to as the "radial direction". The direction in the radial direction approaching the central axis CA is referred to as the "radial inner side", and the direction away from the central axis CA is referred to as the "radial outer side".

[0030] In addition, in this specification, for convenience, the axial direction is defined as the up - down direction, and the side where the impeller 1 is disposed is described as the upper side of the air supply device 10. However, this definition of the up - down direction does not limit the actual orientation and positional relationship of the components of the air supply device 10.

[0031] <1. Structure of the Air Supply Device>

[0032] Figure 1 It is a perspective view of the air supply device 10 of the embodiment.Figure 2 Exploded perspective view of the air supply device 10 of the embodiment. Figure 3 Sectional perspective view of the air supply device 10 of the embodiment. Figure 4 Diagram schematically showing the flow path of the fluid F attracted by the air supply device 10 of the embodiment. Figure 5 Top view of the stator core 221 of the embodiment as viewed from the axial direction. Figure 6 Exploded sectional perspective view of the inner housing 3 of the embodiment. Figure 7 Perspective view of the second inner housing 32 of the embodiment. Figure 8 Cross-sectional view of the motor 2 of the embodiment. In Figure 8 The illustration of the substrate cover 30 is omitted.

[0033] The air supply device 10 includes an impeller 1. The impeller 1 is capable of rotating about a central axis CA extending vertically. The impeller 1 generates an air flow by rotation.

[0034] The air supply device 10 includes a motor 2. The motor 2 rotates the impeller 1. The motor 2 has a rotor 21 and a stator 22. The motor 2 is a brushless motor.

[0035] The air supply device 10 includes an inner housing 3 as a housing. In addition, the air supply device 10 includes an outer housing 4. The inner housing 3 is a component of the motor 2. That is, the motor 2 has the inner housing 3. The inner housing 3 covers the rotor 21 and the stator 22. The outer housing 4 covers the impeller 1 from the radially outer side and covers at least the upper end portion of the motor 2 from the radially outer side.

[0036] The air supply device 10 attracts and discharges the fluid F (refer to Figure 4 ). The air supply device 10 has a suction port 10A on the side where the impeller 1 is disposed (i.e., the upper side). The suction port 10A opens upward. The fluid F is attracted from the suction port 10A by the rotation of the impeller 1. The air supply device 10 has a discharge port 10B that opens downward. The fluid F attracted into the air supply device 10 is discharged from the discharge port 10B. In Figure 4 , the flow of the fluid F is indicated by a thick arrow.

[0037] In addition, the fluid F is mainly a gas such as air, but may also contain a liquid such as water or dust. In addition, the fluid F may also be a liquid.

[0038] <1-1. Impeller>

[0039] The impeller 1 has a plurality of moving blades 11. The plurality of moving blades 11 are arranged in the circumferential direction. By the rotation of the impeller 1, the plurality of moving blades 11 move in the circumferential direction. Thereby, the fluid F is attracted from the suction port 10A. And the fluid F flows radially outward between the circumferences of one moving blade 11 and another moving blade 11 adjacent in the circumferential direction.

[0040] <1-2. Motor>

[0041] <1-2-1. Rotor, Stator, Circuit Board>

[0042] The rotor 21 is rotatable about the central axis CA. The stator 22 is disposed radially outward of the rotor 21. The stator 22 rotates the rotor 21. The motor 2 is an inner rotor type.

[0043] The rotor 21 has a shaft 211. The shaft 211 extends along the central axis CA. The shaft 211 is supported so as to be rotatable about the central axis CA. The shaft 211 projects upward and outward from the inner housing 3. That is, the upper end portion of the shaft 211 is located above and outside the inner housing 3.

[0044] The impeller 1 is fixed to the upper end portion of the shaft 211. That is, the impeller 1 is fixed to the portion of the shaft 211 that projects above and outside the inner housing 3. The impeller 1 causes the fluid F to flow from above downward by rotating together with the shaft 211.

[0045] The rotor 21 has a rotor magnet 212. The rotor magnet 212 is fixed to the radially outer surface of the shaft 211. The rotor magnet 212 alternately has N poles and S poles in the circumferential direction.

[0046] The stator 22 has a stator core 221. The stator core 221 is an annular magnetic body centered on the central axis CA and is a laminate formed by laminating a plurality of plate-shaped electromagnetic steel sheets in the axial direction. The stator core 221 is disposed radially outward of the rotor magnet 212. The stator core 221 faces the rotor magnet 212 with a radial gap therebetween.

[0047] The stator core 221 has a core back 2211 and a plurality of teeth 2212 (see Figure 5 ). The core back 2211 is annular centered on the central axis CA. The plurality of teeth 2212 extend radially from the core back 2211 and are circumferentially spaced apart from each other. The plurality of teeth 2212 extend radially inward from the core back 2211 (i.e., toward the rotor magnet 212).

[0048] The stator 22 has an insulator 222. The insulator 222 covers at least a part of the stator core 221. The insulator 222 covers at least the teeth 2212 from above and covers the teeth 2212 from below. The insulator 222 is an insulating member made of resin or the like.

[0049] The stator 22 has a coil 223. The coil 223 is formed by winding a wire around a stator core 221 with an insulator 222 interposed therebetween. Specifically, the wire is wound around the teeth 2212. That is, the coil 223 is disposed on the teeth 2212. In addition, the radially inner edge portion of the insulator 222 overlaps axially with the front end portion radially inward of the teeth 2212. And, the radially inner edge portion of the insulator 222 projects axially and faces the coil 223 radially.

[0050] In addition, the motor 2 has a circuit board Bd. The circuit board Bd is disposed below the stator 22. Specifically, the circuit board Bd is disposed below a second inner housing 32 described later. Terminal pins protruding from the stator 22 are connected to the circuit board Bd. That is, the circuit board Bd is connected to the stator 22.

[0051] Electronic components MD (refer to Figure 8 ) are assembled on the circuit board Bd. There are various types of electronic components MD assembled on the circuit board Bd. As an example of the electronic component MD, it has a FET (Field Effect Transistor). A lead wire R is connected to the circuit board Bd. That is, the motor 2 has a lead wire R connected to the circuit board Bd.

[0052] <1-2-2. Inner Housing>

[0053] The inner housing 3 has a first inner housing 31. The first inner housing 31 is formed of a metal with high thermal conductivity. The first inner housing 31 is a covered cylindrical shape centered on the central axis CA. The first inner housing 31 covers the stator 22 from above and covers the stator 22 from radially outside. In addition, the first inner housing 31 has a first mounting portion 311 for mounting a second inner housing 32 described later to the first inner housing 31.

[0054] The first inner housing 31 has an upper bearing Br1. The upper bearing Br1 is disposed at the radial center of the cover portion in the first inner housing 31. The upper bearing Br1 rotatably supports the upper end portion of the shaft 211.

[0055] The first inner housing 31 has an inner cylindrical portion 310. The inner cylindrical portion 310 is a cylindrical shape centered on the central axis CA. The inner cylindrical portion 310 covers the stator 22 from radially outside.

[0056] The inner cylinder part 310 holds the stator 22. In order to hold the stator 22, a threaded member 23 is used. The threaded member 23 has an external thread. The inner cylinder part 310 has a stator holding part 3100 on the radially inner side. The front end part of the threaded member 23 is screwed into the stator holding part 3100. The head of the threaded member 23 contacts the lower surface of the stator core 221 from below the stator core 221. Thus, the stator core 221 is clamped between the stator holding part 3100 and the head of the threaded member 23 in the axial direction.

[0057] The inner housing 3 has a second inner housing 32. The second inner housing 32 is formed of a metal with high thermal conductivity. The second inner housing 32 covers the stator 22 from below. In addition, the second inner housing 32 has a second mounting part 321 for mounting the second inner housing 32 to the first inner housing 31.

[0058] The second inner housing 32 has a lower bearing Br2 and a bearing recess 322. The lower bearing Br2 rotatably supports the lower end part of the shaft 211. The bearing recess 322 holds the lower bearing Br2.

[0059] The bearing recess 322 opens upward. The lower bearing Br2 is fixed to the radially inner side surface of the bearing recess 322. In other words, the lower bearing Br2 is disposed in the bearing recess 322 and contacts the radially inner side surface of the bearing recess 322.

[0060] In addition, although not shown in the figure, the stator 22 has a terminal pin. The terminal pin is supported by the insulator 222 and is connected to the coil 223. The terminal pin needs to be led out below the second inner housing 32 in order to be connected to the circuit board Bd. Therefore, the second inner housing 32 has a through hole 320 that penetrates in the axial direction. And the terminal pin protrudes from the through hole 320 to below the second inner housing 32.

[0061] In addition, the inner housing 3 has a substrate cover 30. The substrate cover 30 covers the circuit board Bd from below. The inner housing 3 is composed of the first inner housing 31, the second inner housing 32, and the substrate cover 30.

[0062] The substrate cover 30 is a bottomed cylindrical shape centered on the central axis CA. The substrate cover 30 has a lead through hole 30H that penetrates in the axial direction. The lead through hole 30H is disposed at the bottom part of the substrate cover 30. The lead R is led out from the lead through hole 30H to the outside of the motor 2.

[0063] The substrate cover 30 has a cover cylinder part 300. The cover cylinder part 300 is a cylindrical shape centered on the central axis CA. The cover cylinder part 300 covers the circuit board Bd from the radially outer side.

[0064] <1-3. Outer housing>

[0065] The outer housing 4 has an impeller shroud 41. The impeller shroud 41 is a covered cylindrical shape centered on the central axis CA. The impeller shroud 41 houses the impeller 1. The cover portion of the impeller shroud 41 covers the impeller 1 from above, and the cylindrical portion of the impeller shroud 41 covers the impeller 1 from the radially outer side. In addition, the cover portion of the impeller shroud 41 has an opening that penetrates in the axial direction.

[0066] The outer housing 4 has a diffuser 42. The diffuser 42 is disposed below the impeller 1. The diffuser 42 is fixed to the upper end portion of the inner housing 3. That is, the diffuser 42 is fixed to the cover portion of the first inner housing 31.

[0067] The diffuser 42 has a diffuser cylinder portion 420. The diffuser cylinder portion 420 is a cylindrical shape centered on the central axis CA. The diffuser cylinder portion 420 has a plurality of stationary vanes 421 on the radially inner side. The plurality of stationary vanes 421 are arranged in the circumferential direction.

[0068] The diffuser cylinder portion 420 covers at least the upper end portion of the inner housing 3 from the radially outer side. In other words, the diffuser cylinder portion 420 covers at least the upper end portion of the first inner housing 31 from the radially outer side. For example, the inner cylinder portion 310 has a small diameter portion and a large diameter portion whose radial width is larger than the radial width of the small diameter portion. The small diameter portion is the portion of the inner cylinder portion 310 that includes the upper end portion, and the large diameter portion is the portion of the inner cylinder portion 310 that is below the small diameter portion. The diffuser cylinder portion 420 covers the small diameter portion of the inner cylinder portion 310 from the radially outer side.

[0069] The upper end portion of the diffuser cylinder portion 420 is connected to the lower end portion of the impeller shroud 41. From above toward below, the radially inner side surface of the diffuser cylinder portion 420 is smoothly continuous with the radially inner side surface of the impeller shroud 41.

[0070] The air supply device 10 has the opening of the cover portion of the impeller shroud 41 as the suction port 10A. The air supply device 10 has a flow passage for the fluid F between the outer housing 4 and the first inner housing 31. That is, the first inner housing 31 forms a flow passage for the fluid F between the outer housing 4. The air supply device 10 has a downward opening formed by the outer housing 4 and the first inner housing 31 as the discharge port 10B.

[0071] <2. Contact between the first inner housing and the second inner housing>

[0072] The fluid F sucked by the air supply device 10 includes liquid. Therefore, measures are taken to cover the rotor 21 and the stator 22 with the inner housing 3. As a result, the waterproof property of the motor 2 is improved. However, when the rotor 21 and the stator 22 are covered with the inner housing 3, heat easily stays inside the inner housing 3.

[0073] Here, by forming a flow path for the fluid F between the outer housing 4 and the first inner housing 31, the fluid F flows along the radially outer surface of the first inner housing 31. In this structure, the second inner housing 32 is brought into contact with the first inner housing 31, thereby improving the heat dissipation performance.

[0074] Therefore, the second inner housing 32 is in contact with the first inner housing 31 in the axial direction and the radial direction. By the first inner housing 31 and the second inner housing 32 being in contact in the axial direction and the radial direction, the contact area between the first inner housing 31 and the second inner housing 32 is increased. Therefore, heat conduction from the second inner housing 32 to the first inner housing 31 can be performed well. That is, heat dissipation from the second inner housing 32 via the first inner housing 31 can be performed well. As a result, the heat generated by the motor 2 can be effectively dissipated. As a result, the motor 2 can operate stably.

[0075] <2-1. Contact in the axial direction>

[0076] The second inner housing 32 is fixed to the first inner housing 31. In order to fix the second inner housing 32 to the first inner housing 31, a threaded member 33 is used. That is, the motor 2 has a threaded member 33. The threaded member 33 is an external thread.

[0077] In order to fix the second inner housing 32 to the first inner housing 31 using the threaded member 33, the inner cylindrical portion 310 has a first mounting portion 311. That is, the first inner housing 31 has a first mounting portion 311. The first mounting portion 311 is disposed radially inward of the inner cylindrical portion 310.

[0078] The first inner housing 31 has a plurality of first mounting portions 311. For example, the number of the first mounting portions 311 is three. The three first mounting portions 311 are equally arranged in the circumferential direction around the central axis CA.

[0079] The second inner housing 32 has a second mounting portion 321. The number of the second mounting portions 321 is the same as that of the first mounting portions 311 (i.e., three). The three second mounting portions 321 are equally arranged in the circumferential direction around the central axis CA. The second inner housing 32 is arranged relative to the first inner housing 31 such that the second mounting portion 321 and the first mounting portion 311 overlap in the axial direction.

[0080] The first mounting portion 311 has a threaded hole 3110 extending in the axial direction. The second mounting portion 321 has a threaded through-hole 3210 penetrating in the axial direction. The threaded member 33 is disposed in the threaded through-hole 3210 and screwed into the threaded hole 3110. Thereby, the second inner housing 32 is fixed relative to the first inner housing 31.

[0081] Further, the lower surface of the first mounting portion 311 is parallel to the radial direction. The upper surface of the second mounting portion 321 is parallel to the radial direction and is axially opposed to the lower surface of the first mounting portion 311. And, in a state where the second inner housing 32 is fixed to the first inner housing 31, the lower surface of the first mounting portion 311 and the upper surface of the second mounting portion 321 are in contact with each other axially. That is, the second inner housing 32 has a second mounting portion 321 that is in axial contact with the first mounting portion 311.

[0082] In a structure in which axial contact between the first inner housing 31 and the second inner housing 32 is achieved between the first mounting portion 311 and the second mounting portion 321 in the axial direction, the first mounting portion 311 and the second mounting portion 321 are fixed by a threaded member 33, so that axial contact between the first inner housing 31 and the second inner housing 32 can be reliably maintained. Therefore, heat dissipation from the second inner housing 32 via the first inner housing 31 can be reliably performed. That is, heat generated by the motor 2 can be reliably dissipated.

[0083] Here, the axial contact position P1 between the first inner housing 31 and the second inner housing 32 is a position above the lower end position P2 of the stator 22 (see Figure 8 ). In addition, the lower end position of the radially inner edge portion of the insulator 222 corresponds to the lower end position P2 of the stator 22. Specifically, the lower end position of the portion of the insulator 222 that axially overlaps with the radially inner front end portion of the tooth 2212 corresponds to the lower end position P2 of the stator 22. In Figure 8 , the lower end position of the coil 223 is shown below the lower end position of the radially inner edge portion of the insulator 222, but the axial dimension of the coil 223 has an error of about 1 mm depending on the winding method of the wire. Therefore, it is preferable to define the lower end position of the radially inner edge portion of the insulator 222 as the lower end position P2 of the stator 22. However, in terms of design, when the lower end position of the coil 223 is reliably below the lower end position of the radially inner edge portion of the insulator 222, the lower end position of the coil 223 may be defined as the lower end position P2 of the stator 22.

[0084] By setting the contact position P1 above the lower end position P2 of the stator 22, there is no need to ensure a layout space for the contact portion between the first inner housing 31 and the second inner housing 32 below the stator 22. As a result, the motor 2 does not become large in the axial direction, and the heat dissipation performance of the motor 2 can be improved.

[0085] <2-2. Radial contact>

[0086] The second inner housing 32 is disposed radially inward of the first inner housing 31. And, the second inner housing 32 contacts the first inner housing 31 from the radially inner side.

[0087] Specifically, the radially outer edge portion of the second inner housing 32 extends circumferentially along the radially inner side surface of the inner cylindrical portion 310. That is, the radially outer edge portion of the second inner housing 32 is in the shape of an annular ring centered on the central axis CA. Moreover, the radially outer edge portion of the second inner housing 32 is in radial contact with the radially inner side surface of the inner cylindrical portion 310.

[0088] In the structure where the radially outer edge portion of the second inner housing 32 extends circumferentially along the radially inner side surface of the inner cylindrical portion 310, it is possible to bring the radially outer edge portion of the second inner housing 32 into radial contact with the radially inner side surface of the inner cylindrical portion 310 over substantially the entire circumference in the circumferential direction. Thereby, it is possible to easily increase the radial contact area between the first inner housing 31 and the second inner housing 32.

[0089] In addition, the fluid F flows downward from above along the radially outer side surface of the first inner housing 31. In this structure, if the contact portion between the first inner housing 31 and the second inner housing 32 is exposed to the radially outer side, there may be a problem that liquid invades the interior of the motor 2 through the gap of the contact portion exposed to the radially outer side. Therefore, it is preferable to achieve the radial contact between the first inner housing 31 and the second inner housing 32 by disposing the second inner housing 32 radially inward of the inner cylindrical portion 310 and bringing the radially outer edge portion of the second inner housing 32 into contact with the radially inner side surface of the inner cylindrical portion 310.

[0090] <3. Heat dissipation component for the substrate>

[0091] As Figure 8 shown, the motor 2 is provided with a heat dissipation component 5 for the substrate. The heat dissipation component 5 for the substrate is a component having high thermal conductivity. The heat dissipation component 5 for the substrate is disposed axially between the second inner housing 32 and the circuit board Bd. The heat dissipation component 5 for the substrate is in contact with the second inner housing 32. In addition, the heat dissipation component 5 for the substrate is in contact with the electronic component MD. The heat dissipation component 5 for the substrate is at least in contact with the electronic component MD such as an FET that generates a large amount of heat. The heat dissipation component 5 for the substrate may also be in contact with other electronic components MD, or may be in contact with all electronic components MD.

[0092] By providing the heat dissipation component 5 for the substrate that is in contact with the second inner housing 32 and the circuit board Bd (specifically, the electronic component MD), the heat generated by the electronic component MD is transferred to the first inner housing 31 via the heat dissipation component 5 and the second inner housing 32. Thereby, it is possible to effectively dissipate the heat generated by the electronic component MD.

[0093] For example, the heat dissipation component 5 for the substrate is a heat sink. The heat dissipation component 5 for the substrate can also be a resin sheet containing a filler with high thermal conductivity such as metal and ceramic, or a graphite sheet. The heat dissipation component 5 for the substrate can also be a flexible sheet. Thus, when the second inner housing 32 and the circuit board Bd have unevenness, the heat dissipation component 5 for the substrate deforms along the unevenness, so that the contact area with the heat dissipation component 5 for the substrate can be increased. However, it is not limited thereto. The heat dissipation component 5 for the substrate can also be a rigid sheet such as a metal plate and a ceramic plate.

[0094] In addition, the heat dissipation component 5 for the substrate can be omitted. In this case, a gap is provided between the axial directions of the second inner housing 32 and the electronic component MD of the circuit board Bd.

[0095] <4. Heat dissipation component for stator>

[0096] As Figure 8 shown, the motor 2 has a heat dissipation component 6 for the stator. The heat dissipation component 6 for the stator is a component with high thermal conductivity. The heat dissipation component 6 for the stator is disposed between the axial directions of the inner housing 3 and the stator 22. The heat dissipation component 6 for the stator is in contact with the inner housing 3. In addition, the heat dissipation component 6 for the stator is in contact with the stator 22. Specifically, the heat dissipation component 6 for the stator is in contact with the axial end of the coil 223.

[0097] By providing the heat dissipation component 6 for the stator in contact with the inner housing 3 and the stator 22 (specifically the coil 223), the heat generated by the stator 22 is transferred to the inner housing 3 via the heat dissipation component 6 for the stator. Thus, the heat generated by the stator 22 can be effectively dissipated.

[0098] For example, the heat dissipation component 6 for the stator is a heat sink. The heat dissipation component 6 for the stator can also be a resin sheet containing a filler with high thermal conductivity such as metal and ceramic, or a graphite sheet. The heat dissipation component 6 for the stator can also be an adhesive containing a filler with high thermal conductivity such as metal powder. The heat dissipation component 6 for the stator can also be a grease containing a filler with high thermal conductivity such as metal powder.

[0099] In addition, the heat dissipation component 6 for the stator can be disposed between the axial directions of the first inner housing 31 and the stator 22, or can be disposed between the axial directions of the second inner housing 32 and the stator 22. In addition, the heat dissipation component 6 for the stator can be disposed between the axial directions of both the first inner housing 31 and the stator 22 and the axial directions of the second inner housing 32 and the stator 22. In the following description, the heat dissipation component 6 for the stator disposed between the axial directions of the first inner housing 31 and the stator 22 is denoted by reference numeral 61 and is referred to as the first heat dissipation component 61. The heat dissipation component 6 for the stator disposed between the axial directions of the second inner housing 32 and the stator 22 is denoted by reference numeral 62 and is referred to as the second heat dissipation component 62.

[0100] <4-1. First heat dissipation component>

[0101] The first heat dissipation component 61 is disposed axially between the first inner housing 31 and the stator 22. Specifically, the first heat dissipation component 61 is disposed axially between the lid portion of the first inner housing 31 and the upper end of the coil 223. The first heat dissipation component 61 contacts the lid portion of the first inner housing 31 and also contacts the upper end of the coil 223.

[0102] In the structure having the first heat dissipation component 61, the heat generated by the stator 22 (especially the coil 223) is transferred to the first inner housing 31 for heat dissipation. Thus, the heat dissipation performance of the motor 2 is improved.

[0103] In addition, in order to reduce the number of components and simplify the structure, the first heat dissipation component 61 can also be omitted.

[0104] <4-2. Second heat dissipation component>

[0105] The second heat dissipation component 62 is disposed axially between the second inner housing 32 and the stator 22. Specifically, the second heat dissipation component 62 is disposed axially between the second inner housing 32 and the lower end of the coil 223. The second heat dissipation component 62 contacts the second inner housing 32 and also contacts the lower end of the coil 223.

[0106] In the structure having the second heat dissipation component 62, the heat generated by the stator 22 (especially the coil 223) is transferred to the first inner housing 31 via the second inner housing 32 for heat dissipation. Thus, the heat dissipation characteristics of the motor 2 are improved.

[0107] In addition, in order to reduce the number of components and simplify the structure, the second heat dissipation component 62 can also be omitted.

[0108] <5. Guide for bearing recess>

[0109] Figure 9 It is an enlarged cross-sectional view of the lower bearing Br2 and its periphery in the embodiment.

[0110] The manufacturing process of the motor 2 includes a process of assembling the second inner housing 32 to the first inner housing 31. In this process, with the rotor 21 and the stator 22 fixed to the first inner housing 31 and the lower bearing Br2 fixed to the lower end portion of the shaft 211, the second inner housing 32 is assembled to the first inner housing 31.

[0111] When assembling the second inner housing 32 relative to the first inner housing 31, the second inner housing 32 is pushed radially inward into the inner cylindrical portion 310. At this time, before the lower bearing Br2 is disposed in the bearing recess 322, the radially outer edge portion of the second inner housing 32 contacts the radially inner side surface of the inner cylindrical portion 310.

[0112] In this structure, assuming that there is no guide member 323 described later, after the radially inner surface of the inner cylinder portion 310 comes into contact with the radially outer edge portion of the second inner housing 32, it is necessary to radially align the lower bearing Br2 with the bearing recess 322 while pushing the second inner housing 32 radially inward of the inner cylinder portion 310. Therefore, the assembly of the second inner housing 32 relative to the first inner housing 31 becomes difficult.

[0113] To suppress this problem, the second inner housing 32 has a plurality of guide members 323. The plurality of guide members 323 project upward from the opening edge of the bearing recess 322. The plurality of guide members 323 are equally arranged in the circumferential direction about the central axis CA. That is, the plurality of guide members 323 are arranged at a constant pitch in the circumferential direction.

[0114] The guide member 323 has a guide surface 3230. The guide surface 3230 extends from the radially inner surface of the bearing recess 322. That is, the guide surface 3230 is connected to the radially inner surface of the bearing recess 322. And the guide surface 3230 is inclined radially outward in the upward direction from the opening edge of the bearing recess 322.

[0115] By causing the guide member 323 to project upward from the opening edge of the bearing recess 322, when the second inner housing 32 is assembled to the first inner housing 31, the lower bearing Br2 can be brought into contact with the guide surface 3230 before the radially outer edge portion of the second inner housing 32 comes into contact with the radially inner surface of the inner cylinder portion 310. And since the lower bearing Br2 comes into contact with the guide surface 3230 and then maintains the contact with the guide surface 3230, by simply pushing the second inner housing 32 radially inward of the inner cylinder portion 310, the radial positions of the lower bearing Br2 and the bearing recess 322 can be aligned. Thereby, the second inner housing 32 can be easily assembled to the first inner housing 31.

[0116] Here, the number of the guide members 323 is the same as the number of slots of the motor 2. Since the motor 2 has three slots, the number of the guide members 323 is three. And the respective arrangement positions of the three guide members 323 are aligned with the positions of the slots when viewed from the axial direction.

[0117] Specifically, the guide member 323 is arranged between the circumferences of one tooth 2212 and the other tooth 2212 adjacent in the circumferential direction when viewed from the axial direction (see Figure 5 ). In Figure 5 , the upper end portion of the guide member 323 is indicated by a dotted line.

[0118] By disposing the guide member 323 at such a position that even if the guide member 323 protrudes upward from the opening edge of the bearing recess 322, it is not necessary to increase the interval in the axial direction between the stator 22 and the second inner housing 32. As a result, it is possible to suppress the motor 2 from becoming large in the axial direction.

[0119] Alternatively, by using a lower bearing Br2 with a smaller outer diameter, the opening edge of the bearing recess 322 can be displaced radially inward relative to the radially inner edge of the stator 22, and the guide member 323 can be disposed radially inward relative to the radially inner edge of the stator 22. Further, the opening edge of the bearing recess 322 can be disposed above the lower end of the radially inner edge portion of the insulator 222. Thereby, it is possible to further suppress the motor 2 from becoming large in the axial direction.

[0120] <4. Clamping portion of the substrate cover>

[0121] Figure 10 is an enlarged cross-sectional view of the clamping portion 301 of the substrate cover 30 of the embodiment and its periphery. Further, in Figure 10 “Rin” represents the radially inner side, and “Rout” represents the radially outer side.

[0122] The substrate cover 30 has a cover cylinder portion 300. The cover cylinder portion 300 is a cylindrical shape centered on the central axis CA. Specifically, the cover cylinder portion 300 is a cylindrical shape centered on the central axis CA. The cover cylinder portion 300 covers the circuit board Bd from the radially outer side.

[0123] The upper end portion of the cover cylinder portion 300 has a clamping portion 301. The clamping portion 301 is an annular shape centered on the central axis CA. The lower end portion of the first inner housing 31 has a portion to be clamped 312. That is, the lower end portion of the inner cylinder portion 310 has a portion to be clamped 312. The portion to be clamped 312 is clamped by the clamping portion 301 in the radial direction.

[0124] The clamping portion 301 has a first clamping portion 3011 and a second clamping portion 3012. The first clamping portion 3011 is disposed radially inward of the portion to be clamped 312. The second clamping portion 3012 is disposed radially outward of the portion to be clamped 312. The portion to be clamped 312 is sandwiched between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction.

[0125] Although not shown, a waterproof adhesive is disposed between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction. The waterproof adhesive enters the gap between the first clamping portion 3011 and the portion to be clamped 312 in the radial direction and the gap between the second clamping portion 3012 and the portion to be clamped 312 in the radial direction. By disposing the waterproof adhesive between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction, it is possible to suppress the intrusion of liquid from the radially outer side to the radially inner side of the substrate cover 30.

[0126] Here, the upper end position P11 of the first clamping portion 3011 is a position above the upper end position P12 of the second clamping portion 3012. Thus, even if liquid intrudes between the first clamping portion 3011 and the second clamping portion 3012 from the outer side in the radial direction of the substrate cover 30, it is possible to suppress the liquid from reaching the inner side in the radial direction of the substrate cover 30 across the second clamping portion 3012. That is, the waterproof property of the motor 2 can be improved. As a result, the motor 2 can operate stably.

[0127] In addition, when assembling the substrate cover 30 to the first inner housing 31, first, a waterproof adhesive is applied between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction. Then, in a state where the waterproof adhesive is applied between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction, an operation of disposing the clamped portion 312 between the first clamping portion 3011 and the second clamping portion 3012 while passing the lead wire R through the lead wire through hole 30H is performed.

[0128] At this time, since the upper end position P11 of the first clamping portion 3011 is a position above the upper end position P12 of the second clamping portion 3012, it is possible to suppress the waterproof adhesive from being exposed to the inner side in the radial direction of the substrate cover 30. Thus, it is possible to suppress the lead wire R from coming into contact with the waterproof adhesive when the substrate cover 30 is assembled to the first inner housing 31. As a result, the assemblability of the substrate cover 30 to the first inner housing 31 is improved.

[0129] <5. Usage Example>

[0130] Figure 11 is a perspective view of the vacuum cleaner 100 of the embodiment.

[0131] The vacuum cleaner 100 includes a blower device 10. The vacuum cleaner 100 is a wet / dry dual-purpose machine. That is, the vacuum cleaner 100 sucks dust, liquid, etc. together with air. In the vacuum cleaner 100 equipped with the blower device 10, the motor 2 operates stably, so it is possible to suppress the occurrence of abnormalities such as poor suction.

[0132] In addition, the blower device 10 can be mounted on various types of vacuum cleaners 100 such as rod-type, robot-type, canister-type, and hand-held type.

[0133] <6. Others>

[0134] The embodiments of the present invention have been described above. In addition, the scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented with various modifications without departing from the gist of the invention. In addition, the above-described embodiments can be combined arbitrarily as appropriate.

[0135] The present invention can adopt the following structures (1) to (7).

[0136] (1) An air supply device, comprising:

[0137] An impeller that can rotate about a central axis extending vertically;

[0138] A motor that rotates the above-mentioned impeller; and

[0139] An outer housing that covers the above-mentioned impeller from the radially outer side and covers at least the upper end portion of the above-mentioned motor from the radially outer side,

[0140] The above-mentioned motor has:

[0141] A rotor that can rotate about the above-mentioned central axis;

[0142] A stator that is disposed radially outside the above-mentioned rotor and rotates the above-mentioned rotor; and

[0143] An inner housing that covers the above-mentioned rotor and the above-mentioned stator,

[0144] The above-mentioned rotor has a shaft extending along the above-mentioned central axis,

[0145] The above-mentioned shaft protrudes outward above the above-mentioned inner housing,

[0146] The above-mentioned impeller is fixed to the upper end portion of the above-mentioned shaft and allows fluid to flow from above downward by rotating together with the above-mentioned shaft,

[0147] The above-mentioned inner housing has:

[0148] A first inner housing that is a covered cylindrical shape centered on the above-mentioned central axis, covers the above-mentioned stator from above, and covers the above-mentioned stator from the radially outer side; and

[0149] A second inner housing that covers the above-mentioned stator from below,

[0150] The above-mentioned second inner housing is in contact with the above-mentioned first inner housing in the axial direction and the radial direction,

[0151] The axial contact position of the above-mentioned first inner housing and the above-mentioned second inner housing is a position above the lower end position of the above-mentioned stator.

[0152] (2) The air supply device according to (1), wherein

[0153] The above-mentioned motor has:

[0154] A circuit board that is connected to the above-mentioned stator and is equipped with electronic components; and

[0155] A heat dissipation component for the circuit board,

[0156] The above-mentioned circuit board is disposed below the above-mentioned second inner housing,

[0157] The heat dissipation component for the substrate is disposed between the axial directions of the second inner housing and the circuit board, contacts the second inner housing, and contacts the electronic component.

[0158] (3) The air supply device according to (1) or (2), wherein

[0159] the motor has a heat dissipation component for the stator,

[0160] the heat dissipation component for the stator is disposed between the axial directions of the inner housing and the stator, contacts the inner housing, and contacts the stator.

[0161] (4) The air supply device according to any one of (1) to (3), wherein

[0162] the second inner housing has:

[0163] a lower bearing that rotatably supports the lower end portion of the shaft; and

[0164] a bearing recess that holds the lower bearing,

[0165] the bearing recess opens upward,

[0166] the lower bearing is fixed to the radially inner surface of the bearing recess,

[0167] the second inner housing has a plurality of guide members protruding upward from the opening edge of the bearing recess,

[0168] the guide member has a guide surface extending from the radially inner surface of the bearing recess,

[0169] the guide surface is inclined radially outward upward from the opening edge of the bearing recess.

[0170] (5) The air supply device according to (4), wherein

[0171] the stator has:

[0172] a ring-shaped stator core centered on the central axis; and

[0173] a coil,

[0174] the stator core has:

[0175] a ring-shaped core back centered on the central axis; and

[0176] a plurality of teeth extending radially from the core back and arranged at intervals in the circumferential direction,

[0177] The above-mentioned coil is disposed on the above-mentioned tooth.

[0178] When observed axially, the above-mentioned guide member is disposed between the circumferences of one of the above-mentioned teeth and the other of the above-mentioned teeth that are adjacent in the circumferential direction.

[0179] (6) An air supply device, comprising:

[0180] An impeller that can rotate about a central axis extending vertically;

[0181] A motor that rotates the above-mentioned impeller; and

[0182] An outer housing that covers the above-mentioned impeller from the radially outer side and covers at least the upper end portion of the above-mentioned motor from the radially outer side.

[0183] The above-mentioned motor has:

[0184] A rotor that can rotate about the above-mentioned central axis;

[0185] A stator that is disposed on the radially outer side of the above-mentioned rotor and rotates the above-mentioned rotor;

[0186] A circuit board that is connected to the above-mentioned stator and is equipped with electronic components; and

[0187] An inner housing that covers the above-mentioned rotor and the above-mentioned stator.

[0188] The above-mentioned rotor has a shaft extending along the above-mentioned central axis.

[0189] The above-mentioned shaft protrudes outward above the above-mentioned inner housing in the axial direction.

[0190] The above-mentioned impeller is fixed to the upper end portion of the above-mentioned shaft and causes fluid to flow from above downward by rotating together with the above-mentioned shaft.

[0191] The above-mentioned inner housing has:

[0192] A first inner housing that is a covered cylindrical shape centered on the above-mentioned central axis, covers the above-mentioned stator from above, and covers the above-mentioned stator from the radially outer side;

[0193] A second inner housing that covers the above-mentioned stator from below; and

[0194] A substrate cover.

[0195] The above-mentioned circuit board is disposed below the above-mentioned second inner housing.

[0196] The above-mentioned substrate cover covers the above-mentioned circuit board from below.

[0197] The above-mentioned substrate cover has a cylindrical cover tube portion centered on the above-mentioned central axis.

[0198] The upper end portion of the above-mentioned cover tube portion has a clamping portion.

[0199] The lower end portion of the above-mentioned first inner housing has a portion to be clamped that is clamped radially by the above-mentioned clamping portion.

[0200] The above-mentioned clamping portion has:

[0201] A first clamping portion that is disposed radially inward of the above-mentioned portion to be clamped; and

[0202] A second clamping portion that is disposed radially outward of the above-mentioned portion to be clamped.

[0203] The upper end position of the above-mentioned first clamping portion is a position higher than the upper end position of the above-mentioned second clamping portion.

[0204] (7) A vacuum cleaner comprising the air supply device according to any one of (1) to (6) above.

[0205] Industrial availability

[0206] The present invention can be used, for example, for an air supply device mounted on a vacuum cleaner or the like.

Claims

1. An air supply device, characterized in that: have: An impeller capable of rotating about a central axis extending vertically; a motor that rotates the impeller; and an outer casing covering the impeller from the radially outer side and covering at least the upper end portion of the motor from the radially outer side, The motor has: a rotor capable of rotating about the central axis; a stator disposed radially outward of the rotor and causing the rotor to rotate; and an inner housing covering the rotor and the stator, The rotor has a shaft extending along the central axis, The shaft protrudes upward and outwardly from the inner shell, The impeller is fixed to the upper end of the shaft and rotates together with the shaft to cause the fluid to flow from the upper side to the lower side. The inner shell has: A first inner housing, which is a covered cylindrical shape centered on the central axis, covers the stator from above and covers the stator from the outside in the radial direction; as well as a second inner housing covering the stator from below, The second inner shell is in contact with the first inner shell in the axial direction and the radial direction, A contact position between the first inner housing and the second inner housing in the axial direction is located above a lower end position of the stator.

2. The air supply device according to claim 1, characterized in that: The motor has: a circuit substrate connected to the stator and equipped with electronic components; and Heat dissipation components for substrates, The circuit substrate is arranged below the second inner shell. The substrate heat dissipating member is disposed between the second inner case and the circuit board in the axial direction, is in contact with the second inner case, and is in contact with the electronic component.

3. The air supply device according to claim 1, characterized in that: The motor has a heat dissipation component for the stator. The stator heat dissipation member is disposed between the inner case and the stator in the axial direction, and is in contact with the inner case and the stator.

4. The air supply device according to claim 1, characterized in that: The second inner shell has: a lower bearing that rotatably supports a lower end portion of the shaft; and a bearing recess which holds the lower bearing, The bearing recess is open upward. The lower bearing is fixed to the radial inner side surface of the bearing recess. The second inner housing has a plurality of guide members protruding upward from the opening edge of the bearing recess. The guide member has a guide surface extending from the radial inner side surface of the bearing recess, The guide surface is inclined radially outward from an opening edge of the bearing recess toward the upper side.

5. The air supply device according to claim 4, characterized in that: The stator has: an annular stator core centered on the central axis; and Coil, The stator core has: an annular core back centered on the central axis; and A plurality of teeth extending radially from the core back and arranged at intervals from each other in the circumferential direction, The coil is arranged on the tooth, The guide is arranged between one of the teeth and the other of the teeth adjacent to each other in the circumferential direction when viewed in the axial direction.

6. An air supply device, characterized in that: have: An impeller capable of rotating about a central axis extending vertically; a motor that rotates the impeller; and an outer casing covering the impeller from the radially outer side and covering at least the upper end portion of the motor from the radially outer side, The motor has: a rotor capable of rotating about the central axis; a stator disposed radially outward of the rotor and causing the rotor to rotate; a circuit substrate connected to the stator and equipped with electronic components; and an inner housing covering the rotor and the stator, The rotor has a shaft extending along the central axis, The shaft protrudes upward and outwardly from the inner shell, The impeller is fixed to the upper end of the shaft and rotates together with the shaft to cause the fluid to flow from the upper side to the lower side. The inner shell has: A first inner housing, which is a covered cylindrical shape centered on the central axis, covers the stator from above and covers the stator from the outside in the radial direction; a second inner housing covering the stator from below; as well as Substrate cover, The circuit substrate is arranged below the second inner shell. The substrate cover covers the circuit substrate from below, The substrate cover has a cylindrical cover tube portion centered on the central axis. The upper end portion of the cover tube portion has a clamping portion, The lower end portion of the first inner housing has a clamped portion clamped by the clamping portion in a radial direction. The clamping portion has: A first clamping portion, which is arranged radially inward of the clamped portion; as well as The second clamping portion is arranged radially outward of the clamped portion, The upper end position of the first clamping portion is located above the upper end position of the second clamping portion.

7. A vacuum cleaner, characterized in that: A ventilation device according to any one of claims 1 to 6 is provided.

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