Blower and cleaner

Abstract

To provide a blower which improves waterproofness and heat dissipation to stably operate a motor.SOLUTION: A blower comprises: an impeller 1; a motor 2; and an outer housing 4 which covers the impeller from the outside in a radial direction and covers at least an upper end of the motor from the outside in the radial direction. The motor has: a rotor 21; a stator 22; and an inner housing 3 which covers the rotor and the stator. The rotor has a shaft 211. The shaft projects to the outside of an upper part of the inner housing. The impeller is fixed to the upper end of the shaft, and distributes fluid from the upper part to the lower part by rotating with the shaft. The inner housing has: a first inner housing 31 which covers the stator from the upper part and covers the stator from the outside in the radial direction; and a second inner housing 32 which covers the stator from the lower part. The second inner housing contacts the first inner housing in an axial direction and the radial direction. A contact position between the first inner housing and the second inner housing is at a position above a lower end position of the stator.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a blower device and a vacuum cleaner.

Background Art

[0002] Conventionally, a blower device (motor) mounted on a wet / dry vacuum cleaner is known. Such a blower device is disclosed in, for example, Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a blower device is mounted on a wet / dry vacuum cleaner, if the waterproof property of the motor of the blower device is insufficient, liquid may enter the inside of the motor, making it difficult to operate the motor stably. On the other hand, in order to improve the waterproof property, if the motor is covered with a housing, the heat dissipation property of the motor will decrease. Even when the heat dissipation property of the motor decreases, it may become difficult to operate the motor stably.

[0005] An object of the present invention is to stably operate the motor of the blower device.

Means for Solving the Problems

[0006] An exemplary blower device of the present invention includes an impeller rotatable about a vertically extending central axis, a motor for rotating 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 rotatable about the central axis, a stator disposed radially outward of the rotor for rotating the rotor, and an inner housing covering the rotor and the stator. The rotor has a shaft extending along the central axis. The shaft projects above the outer side of the inner housing. The impeller is fixed to the upper end portion of the shaft and circulates fluid from above to below by rotating together with the shaft. The inner housing is a covered cylindrical shape centered on the central axis, and has a first inner housing that 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 is in axial and radial contact with the first inner housing. The axial contact position between the first inner housing and the second inner housing is above the lower end position of the stator.

[0007] An exemplary blower device of the present invention includes an impeller rotatable about a vertically extending central axis, a motor for rotating 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 rotatable about the central axis, a stator disposed radially outward of the rotor for rotating the rotor, a circuit board connected to the stator and on which electronic components are mounted, and an inner housing that covers the rotor and the stator. The rotor has a shaft extending along the central axis. The shaft projects outward above the inner housing. The impeller is fixed to the upper end portion of the shaft and circulates fluid from above downward by rotating together with the shaft. The inner housing is a covered cylindrical shape centered on the central axis, has a first inner housing that 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 board cover. The circuit board is disposed below the second inner housing. The board cover covers the circuit board from below. The board 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 radially clamped by the clamping portion. The clamping portion has a first clamping portion disposed radially inward of the clamped portion and a second clamping portion disposed radially outward of the clamped portion. The upper end position of the first clamping portion is above the upper end position of the second clamping portion.

[0008] An exemplary vacuum cleaner of the present invention includes the above blower device.

Advantages of the Invention

[0009] According to the exemplary blower device and vacuum cleaner of the present invention, the motor of the blower device can be stably operated.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 1 to 11.

[0012] In this specification, the direction in which the central axis CA of the blower 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". Further, the direction orthogonal to the central axis CA is referred to as the "radial direction". Among the radial directions, the direction approaching the central axis CA is referred to as the "radially inward direction", and the direction separating from the central axis CA is referred to as the "radially outward direction".

[0013] In this specification, for convenience, the axial direction is defined as the vertical direction, and the side where the impeller 1 is disposed is described as the upper side of the blower device 10. However, this definition of the vertical direction does not limit the actual orientation and positional relationship of each component of the blower device 10.

[0014] <1. Configuration of Blower Device> FIG. 1 is a perspective view of a blower device 10 according to an embodiment. FIG. 2 is an exploded perspective view of the blower device 10 according to the embodiment. FIG. 3 is a cross-sectional perspective view of the blower device 10 according to the embodiment. FIG. 4 is a diagram schematically showing a flow path of a fluid F sucked by the blower device 10 according to the embodiment. FIG. 5 is a plan view of a stator core 221 according to the embodiment as viewed from the axial direction. FIG. 6 is an exploded cross-sectional perspective view of an inner housing 3 according to the embodiment. FIG. 7 is a perspective view of a second inner housing 32 according to the embodiment. FIG. 8 is a cross-sectional view of a motor 2 according to the embodiment. In FIG. 8, illustration of a substrate cover 30 is omitted.

[0015] The blower device 10 includes an impeller 1. The impeller 1 is rotatable about a central axis CA extending vertically. The impeller 1 generates an air flow by rotating.

[0016] The blower 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.

[0017] The blower device 10 includes an inner housing 3 as a housing. Further, the blower 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.

[0018] The blower device 10 sucks and discharges a fluid F (see FIG. 4). The blower device 10 has a suction port 10A on the side where the impeller 1 is disposed (that is, the upper side). The suction port 10A opens upward. When the impeller 1 rotates, the fluid F is sucked from the suction port 10A. The blower device 10 has a discharge port 10B that opens downward. The fluid F sucked by the blower device 10 is discharged from the discharge port 10B. In FIG. 4, the flow of the fluid F is indicated by a thick arrow.

[0019] The fluid F is mainly a gas such as air, but may include a liquid such as water or may include dust. Further, the fluid F may be a liquid.

[0020] <1-1. Impeller> The impeller 1 has a plurality of moving blades 11. The plurality of moving blades 11 are arranged in the circumferential direction. When the impeller 1 rotates, the plurality of moving blades 11 move in the circumferential direction. Thereby, the fluid F is sucked from the suction port 10A. Then, the fluid F flows radially outward from between the circumferential directions of one moving blade 11 and the other moving blade 11 adjacent to each other in the circumferential direction.

[0021] <1-2. Motor> <1-2-1. Rotor·Stator·Circuit Board> The rotor 21 is rotatable about the central axis CA. The stator 22 is disposed radially outside the rotor 21. The stator 22 rotates the rotor 21. The motor 2 is of an inner rotor type.

[0022] The rotor 21 has a shaft 211. The shaft 211 extends along the central axis CA. The shaft 211 is rotatably supported about the central axis CA. The shaft 211 protrudes above the outer side of the inner housing 3. That is, the upper end portion of the shaft 211 is located above the outer side of the inner housing 3.

[0023] 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 protrudes above the outer side of the inner housing 3. The impeller 1 circulates the fluid F from above to below by rotating together with the shaft 211.

[0024] 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 has N poles and S poles alternately in the circumferential direction.

[0025] 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 in which a plurality of plate-shaped electromagnetic steel sheets are laminated 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.

[0026] The stator core 221 has a core back 2211 and a plurality of teeth 2212 (see FIG. 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 arranged at intervals in the circumferential direction. The plurality of teeth 2212 extend radially inward (i.e., in the direction toward the rotor magnet 212) from the core back 2211.

[0027] 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 using resin or the like.

[0028] The stator 22 has a coil 223. The coil 223 is formed by winding a conducting wire around the stator core 221 via the insulator 222. Specifically, the conducting wire is wound around the teeth 2212. That is, the coil 223 is disposed on the teeth 2212. Note that the radially inner edge portion of the insulator 222 overlaps with the radially inner tip portion of the teeth 2212 in the axial direction. And the radially inner edge portion of the insulator 222 protrudes in the axial direction and faces the coil 223 in the radial direction.

[0029] Also, 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.

[0030] On the circuit board Bd, electronic components MD (see FIG. 8) are mounted. There are various electronic components MD mounted on the circuit board Bd. As an example of the electronic component MD, there is 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.

[0031] <1-2-2. Inner housing> 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 the radially outer side. Note that the first inner housing 31 has a first attachment portion 311 for attaching a second inner housing 32, which will be described later, to the first inner housing 31.

[0032] The first inner housing 31 has an upper bearing Br1. The upper bearing Br1 is disposed at the radially central portion of the lid portion of the first inner housing 31. The upper bearing Br1 rotatably supports the upper end portion of the shaft 211.

[0033] 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 the radially outer side.

[0034] The inner cylindrical portion 310 holds the stator 22. In order to hold the stator 22, a screw member 23 is used. The screw member 23 is a male screw. The inner cylindrical portion 310 has a stator holding portion 3100 radially inward. The tip of the screw member 23 is screwed into the stator holding portion 3100. The head of the screw member 23 contacts the lower surface of the stator core 221 from below the stator core 221. Thereby, the stator core 221 is sandwiched between the stator holding portion 3100 and the head of the screw member 23 in the axial direction.

[0035] 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. Note that the second inner housing 32 has a second attachment portion 321 for attaching the second inner housing 32 to the first inner housing 31.

[0036] The second inner housing 32 has a lower bearing Br2 and a bearing recess 322. The lower bearing Br2 rotatably supports the lower end portion of the shaft 211. The bearing recess 322 holds the lower bearing Br2.

[0037] The bearing recess 322 opens upward. The lower bearing Br2 is fixed to the radially inner 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 surface of the bearing recess 322.

[0038] Although not shown, the stator 22 has terminal pins. The terminal pins are supported by an insulator 222 and connected to the coil 223. Since the terminal pins are to be connected to the circuit board Bd, they need to be drawn out below the second inner housing 32. For this reason, the second inner housing 32 has a through hole 320 that penetrates in the axial direction. Then, the terminal pins project below the second inner housing 32 from the through hole 320.

[0039] The inner housing 3 also 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.

[0040] The substrate cover 30 is a bottomed cylindrical shape centered on the central axis CA. The substrate cover 30 has a lead wire through hole 30H that penetrates in the axial direction. The lead wire through hole 30H is disposed at the bottom portion of the substrate cover 30. The lead wire R is drawn out from the motor 2 through the lead wire through hole 30H.

[0041] The substrate cover 30 has a cover cylindrical portion 300. The cover cylindrical portion 300 is cylindrical with the central axis CA as the center. The cover cylindrical portion 300 covers the circuit board Bd from the radially outer side.

[0042] <1-3. Outer housing> The outer housing 4 has an impeller cover 41. The impeller cover 41 is a covered cylindrical shape with the central axis CA as the center. The impeller cover 41 houses the impeller 1. The lid portion of the impeller cover 41 covers the impeller 1 from above, and the cylindrical portion of the impeller cover 41 covers the impeller 1 from the radially outer side. Note that the lid portion of the impeller cover 41 has an opening penetrating in the axial direction.

[0043] 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 lid portion of the first inner housing 31.

[0044] The diffuser 42 has a diffuser cylindrical portion 420. The diffuser cylindrical portion 420 is cylindrical with the central axis CA as the center. The diffuser cylindrical portion 420 has a plurality of stationary vanes 421 in the radial direction. The plurality of stationary vanes 421 are arranged in the circumferential direction.

[0045] The diffuser cylindrical portion 420 covers at least the upper end portion of the inner housing 3 from the radially outer side. In other words, the diffuser cylindrical portion 420 covers at least the upper end portion of the first inner housing 31 from the radially outer side. For example, the inner cylindrical portion 310 has a small-diameter portion and a large-diameter portion having a larger radial width than the small-diameter portion. The small-diameter portion is a portion including the upper end portion of the inner cylindrical portion 310, and the large-diameter portion is a portion below the small-diameter portion of the inner cylindrical portion 310. The diffuser cylindrical portion 420 covers the small-diameter portion of the inner cylindrical portion 310 from the radially outer side.

[0046] The upper end portion of the diffuser cylindrical portion 420 is connected to the lower end portion of the impeller cover 41. From above to below, the radially inner surface of the diffuser cylindrical portion 420 is smoothly continuous with the radially inner surface of the impeller cover 41.

[0047] The blower device 10 has an opening in the lid portion of the impeller cover 41 as a suction port 10A. The blower device 10 has a fluid F flow passage between the outer housing 4 and the first inner housing 31. That is, the first inner housing 31 forms a fluid F flow passage between the outer housing 4. The blower device 10 has a downward opening formed by the outer housing 4 and the first inner housing 31 as a discharge port 10B.

[0048] <2. Contact between the first inner housing and the second inner housing> The fluid F sucked by the blower device 10 contains 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 is likely to be trapped inside the inner housing 3.

[0049] Here, since a fluid F flow passage is formed 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 configuration, by bringing the second inner housing 32 into contact with the first inner housing 31, the heat dissipation property is improved.

[0050] Therefore, the second inner housing 32 is in contact with the first inner housing 31 in the axial direction and the radial direction. By bringing the first inner housing 31 and the second inner housing 32 into contact with each other in the axial direction and the radial direction, the contact area between the first inner housing 31 and the second inner housing 32 increases, so that heat conduction from the second inner housing 32 to the first inner housing 31 is performed well. That is, heat dissipation from the second inner housing 32 through the first inner housing 31 is performed well. As a result, the heat generated by the motor 2 can be dissipated efficiently. As a result, the motor 2 can be operated stably.

[0051] <2-1. Axial contact> 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 screw member 33 is used. That is, the motor 2 has a screw member 33. The screw member 33 is a male screw.

[0052] In order to fix the second inner housing 32 to the first inner housing 31 using the screw 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.

[0053] 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 evenly arranged in the circumferential direction around the central axis CA.

[0054] 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 (that is, three). The three second mounting portions 321 are evenly arranged in the circumferential direction around the central axis CA. The second inner housing 32 is arranged with respect to the first inner housing 31 such that the second mounting portion 321 and the first mounting portion 311 overlap in the axial direction.

[0055] The first mounting portion 311 has a screw hole 3110 extending in the axial direction. The second mounting portion 321 has a through-screw hole 3210 penetrating in the axial direction. The screw member 33 is disposed in the through-screw hole 3210 and screwed into the screw hole 3110. Thereby, the second inner housing 32 is fixed to the first inner housing 31.

[0056] Note that 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 faces the lower surface of the first mounting portion 311 in the axial direction. 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 in the axial direction. That is, the second inner housing 32 has a second mounting portion 321 that is in contact with the first mounting portion 311 in the axial direction.

[0057] In the configuration where the axial contact between the first inner housing 31 and the second inner housing 32 is realized axially between the first mounting portion 311 and the second mounting portion 321, since the first mounting portion 311 and the second mounting portion 321 are fixed by the screw member 33, the 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 through the first inner housing 31 can be surely performed. That is, the heat generated by the motor 2 can be reliably dissipated.

[0058] 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 Fig. 8). Note that 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 where the tip portion radially inward of the teeth 2212 overlaps axially corresponds to the lower end position P2 of the stator 22. In Fig. 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 conductor. 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, if the lower end position of the coil 223 is surely 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.

[0059] By setting the contact position P1 to a position above the lower end position P2 of the stator 22, it is not necessary to secure the arrangement space of the contact portion between the first inner housing 31 and the second inner housing 32 below the stator 22. Thereby, the heat dissipation performance of the motor 2 can be improved without increasing the size of the motor 2 in the axial direction.

[0060] <2-2. Radial contact> 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.

[0061] Specifically, the radially outer edge portion of the second inner housing 32 extends in the circumferential direction along the radially inner surface of the inner cylindrical portion 310. That is, the radially outer edge portion of the second inner housing 32 is annular with the central axis CA as the center. And the radially outer edge portion of the second inner housing 32 is in radial contact with the radially inner surface of the inner cylindrical portion 310.

[0062] In the configuration where the radially outer edge portion of the second inner housing 32 extends in the circumferential direction along the radially inner surface of the inner cylindrical portion 310, the radially outer edge portion of the second inner housing 32 can be brought into radial contact with the radially inner 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.

[0063] Note that the fluid F flows from above to below along the radially outer surface of the first inner housing 31. In this configuration, if the contact portion between the first inner housing 31 and the second inner housing 32 is exposed radially outward, there may be a problem that liquid may enter the inside of the motor 2 through the gap of the contact portion exposed radially outward. For this reason, it is preferable to arrange the second inner housing 32 radially inward of the inner cylindrical portion 310 and bring the radially outer edge portion of the second inner housing 32 into contact with the radially inner surface of the inner cylindrical portion 310 to realize the radial contact between the first inner housing 31 and the second inner housing 32.

[0064] <3. Heat Dissipation Member for Substrate> As shown in FIG. 8, the motor 2 has a heat dissipation member 5 for the substrate. The heat dissipation member 5 for the substrate is a member having high thermal conductivity. The heat dissipation member 5 for the substrate is disposed axially between the second inner housing 32 and the circuit board Bd. The heat dissipation member 5 for the substrate is in contact with the second inner housing 32. Also, the heat dissipation member 5 for the substrate is in contact with the electronic component MD. The heat dissipation member 5 for the substrate is in contact with at least the electronic component MD with a large heat generation amount such as an FET. The heat dissipation member 5 for the substrate may be in contact with other electronic components MD or may be in contact with all the electronic components MD.

[0065] By providing the heat radiating member 5 for the substrate that contacts the second inner housing 32 and the circuit board Bd (specifically, the electronic component MD), the heat generated by the electronic component MD is transmitted to the first inner housing 31 through the heat radiating member 5 for the substrate and the second inner housing 32. Thereby, the heat generated by the electronic component MD can be efficiently radiated.

[0066] For example, the heat radiating member 5 for the substrate is a heat radiating sheet. The heat radiating member 5 for the substrate may be a resin sheet containing a filler having high thermal conductivity such as metal and ceramic, or may be a graphite sheet. The heat radiating member 5 for the substrate may be a sheet having flexibility. Thereby, when there are irregularities on the second inner housing 32 and the circuit board Bd, the heat radiating member 5 for the substrate deforms along the irregularities, so that the contact area with the heat radiating member 5 for the substrate can be increased. However, it is not limited thereto. The heat radiating member 5 for the substrate may be a rigid sheet such as a metal plate and a ceramic plate.

[0067] Note that the heat radiating member 5 for the substrate may be omitted. In this case, a gap is provided in the axial direction between the second inner housing 32 and the electronic component MD of the circuit board Bd.

[0068] <4. Heat Radiating Member for Stator> As shown in FIG. 8, the motor 2 has a heat radiating member 6 for the stator. The heat radiating member 6 for the stator is a member having high thermal conductivity. The heat radiating member 6 for the stator is disposed in the axial direction between the inner housing 3 and the stator 22. The heat radiating member 6 for the stator contacts the inner housing 3. Also, the heat radiating member 6 for the stator contacts the stator 22. Specifically, the heat radiating member 6 for the stator contacts the axial end of the coil 223.

[0069] By providing the heat radiating member 6 for the stator that contacts the inner housing 3 and the stator 22 (specifically, the coil 223), the heat generated by the stator 22 is transmitted to the inner housing 3 through the heat radiating member 6 for the stator. Thereby, the heat generated by the stator 22 can be efficiently radiated.

[0070] For example, the stator heat dissipation member 6 is a heat dissipation sheet. The stator heat dissipation member 6 may be a resin sheet containing a filler having high thermal conductivity such as metal and ceramic, or may be a graphite sheet. The stator heat dissipation member 6 may be an adhesive containing a filler having high thermal conductivity such as metal powder. The stator heat dissipation member 6 may be a grease containing a filler having high thermal conductivity such as metal powder.

[0071] Note that the stator heat dissipation member 6 may be disposed axially between the first inner housing 31 and the stator 22, or may be disposed axially between the second inner housing 32 and the stator 22. Further, the stator heat dissipation member 6 may be disposed both axially between the first inner housing 31 and the stator 22 and axially between the second inner housing 32 and the stator 22. In the following description, the stator heat dissipation member 6 disposed axially between the first inner housing 31 and the stator 22 is denoted by reference numeral 61 and is referred to as the first heat dissipation member 61. The stator heat dissipation member 6 disposed axially between the second inner housing 32 and the stator 22 is denoted by reference numeral 62 and is referred to as the second heat dissipation member 62.

[0072] <4-1. First heat dissipation member> The first heat dissipation member 61 is disposed axially between the first inner housing 31 and the stator 22. Specifically, the first heat dissipation member 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 member 61 contacts the lid portion of the first inner housing 31 and the upper end of the coil 223.

[0073] In the configuration having the first heat dissipation member 61, the heat generated by the stator 22 (particularly the coil 223) is transmitted to the first inner housing 31 and dissipated. Thereby, the heat dissipation performance of the motor 2 is improved.

[0074] Note that in order to reduce the number of parts and simplify the structure, the first heat dissipation member 61 may be omitted.

[0075] <4-2. Second heat dissipation member> The second heat radiating member 62 is disposed axially between the second inner housing 32 and the stator 22. Specifically, the second heat radiating member 62 is disposed axially between the second inner housing 32 and the lower end of the coil 223. The second heat radiating member 62 contacts the second inner housing 32 and also contacts the lower end of the coil 223.

[0076] In the configuration having the second heat radiating member 62, heat generated by the stator 22 (particularly the coil 223) is transmitted to the first inner housing 31 via the second inner housing 32 and dissipated. Thereby, the heat dissipation characteristics of the motor 2 are improved.

[0077] Note that, in order to reduce the number of components and simplify the structure, the second heat radiating member 62 may be omitted.

[0078] <5. Guide for the Bearing Recess> FIG. 9 is an enlarged cross-sectional view of the lower bearing Br2 and its surroundings according to the embodiment.

[0079] In the manufacturing process of the motor 2, there is a step of assembling the second inner housing 32 to the first inner housing 31. In this step, 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.

[0080] When the second inner housing 32 is assembled to the first inner housing 31, the second inner housing 32 is pushed radially inward of 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 surface of the inner cylindrical portion 310.

[0081] In this configuration, if there were no guide 323 described later, after the radially inner surface of the inner cylindrical portion 310 came into contact with the radially outer edge portion of the second inner housing 32, it would be necessary to push the second inner housing 32 radially inward of the inner cylindrical portion 310 while aligning the lower bearing Br2 and the bearing recess 322 in the radial direction. For this reason, it would be difficult to assemble the second inner housing 32 to the first inner housing 31.

[0082] To suppress this inconvenience, the second inner housing 32 has a plurality of guides 323. The plurality of guides 323 project upward from the opening edge of the bearing recess 322. The plurality of guides 323 are evenly arranged in the circumferential direction about the central axis CA. That is, the plurality of guides 323 are arranged at a constant pitch in the circumferential direction.

[0083] The guide 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 slopes radially outward from the opening edge of the bearing recess 322 upward.

[0084] By projecting the guide 323 upward from the opening edge of the bearing recess 322, when assembling the second inner housing 32 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 contacts the radially inner surface of the inner cylindrical portion 310. And after the lower bearing Br2 comes into contact with the guide surface 3230, the contact between the lower bearing Br2 and the guide surface 3230 is maintained, so that by simply pushing the second inner housing 32 radially inward of the inner cylindrical portion 310, the radial positions of the lower bearing Br2 and the bearing recess 322 are aligned. Thereby, the second inner housing 32 can be easily assembled to the first inner housing 31.

[0085] Here, the number of guides 323 is the same as the number of slots of the motor 2. Since the motor 2 has 3 slots, the number of guides 323 is 3. And the arrangement position of each of the three guides 323 is aligned with the position of the slot when viewed from the axial direction.

[0086] Specifically, the guide 323 is arranged in the circumferential direction between one tooth 2212 and the other tooth 2212 adjacent to each other in the circumferential direction when viewed from the axial direction (see Fig. 5). In Fig. 5, the upper end of the guide 323 is shown by a dotted line.

[0087] By arranging the guide 323 in such a position, even if the guide 323 protrudes upward from the opening edge of the bearing recess 322, it is not necessary to increase the distance 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.

[0088] Note that by using the lower bearing Br2 with a smaller outer diameter, the opening edge of the bearing recess 322 can be displaced radially inward from the radially inner edge of the stator 22, and the guide 323 may be arranged radially inward from the radially inner edge of the stator 22. And the opening edge of the bearing recess 322 may be arranged 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.

[0089] <4. Clamping portion of the board cover> Fig. 10 is an enlarged cross-sectional view of the clamping portion 301 of the board cover 30 according to the embodiment and its periphery. In Fig. 10, the radially inner side is indicated by "Rin", and the radially outer side is indicated by "Rout".

[0090] The board cover 30 has a cover cylindrical portion 300. The cover cylindrical portion 300 is cylindrical with the central axis CA as the center. Specifically, the cover cylindrical portion 300 is cylindrical with the central axis CA as the center. The cover cylindrical portion 300 covers the circuit board Bd from the radially outer side.

[0091] The upper end of the cover cylinder portion 300 has a clamping portion 301. The clamping portion 301 is annular with the central axis CA as the center. The lower end of the first inner housing 31 has a portion to be clamped 312. That is, the lower end of the inner cylinder portion 310 has a portion to be clamped 312. The portion to be clamped 312 is radially clamped by the clamping portion 301.

[0092] The clamping portion 301 has a first clamping portion 3011 and a second clamping portion 3012. The first clamping portion 3011 is arranged radially inward of the portion to be clamped 312. The second clamping portion 3012 is arranged radially outward of the portion to be clamped 312. The portion to be clamped 312 is clamped between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction.

[0093] Although not shown, a waterproof adhesive is arranged between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction. The waterproof adhesive enters the gaps between the first clamping portion 3011 and the portion to be clamped 312 and between the second clamping portion 3012 and the portion to be clamped 312 in the radial direction. By arranging the waterproof adhesive between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction, the intrusion of liquid from the outside to the inside in the radial direction of the substrate cover 30 can be suppressed.

[0094] Here, the upper end position P11 of the first clamping portion 3011 is above the upper end position P12 of the second clamping portion 3012. Thereby, even if liquid intrudes between the first clamping portion 3011 and the second clamping portion 3012 from the outside in the radial direction of the substrate cover 30, it can be suppressed that the liquid climbs over the second clamping portion 3012 and reaches the inside in the radial direction of the substrate cover 30. That is, the waterproof property of the motor 2 can be improved. As a result, the motor 2 can operate stably.

[0095] When assembling the board 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, with the waterproof adhesive applied between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction, while passing the lead wire R through the lead wire through-hole 30H, the clamped portion 312 is arranged between the first clamping portion 3011 and the second clamping portion 3012 in the radial direction.

[0096] At this time, since the upper end position P11 of the first clamping portion 3011 is above the upper end position P12 of the second clamping portion 3012, it is possible to suppress the exposure of the waterproof adhesive to the inner side in the radial direction of the board cover 30. Thereby, it is possible to suppress the lead wire R from coming into contact with the waterproof adhesive when the board cover 30 is assembled to the first inner housing 31. As a result, the assemblability of the board cover 30 to the first inner housing 31 is improved.

[0097] <5. Usage example> FIG. 11 is a perspective view of the vacuum cleaner 100 according to the embodiment.

[0098] The vacuum cleaner 100 includes a blower device 10. The vacuum cleaner 100 is a wet / dry vacuum cleaner. That is, the vacuum cleaner 100 sucks dust, liquid, etc. together with air. In the vacuum cleaner 100 equipped with the blower device 10, since the motor 2 operates stably, it is possible to suppress the occurrence of abnormalities such as poor suction.

[0099] Note that the blower device 10 can be mounted on various types of vacuum cleaners 100 such as stick type, robot type, canister type, and handy type.

[0100] <6. Others> The embodiments of the present invention have been described above. Note that 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. Also, the above-described embodiments can be arbitrarily combined as appropriate.

[0101] The present invention can take the following configurations (1) to (7).

[0102] (1) An impeller rotatable about a central axis extending vertically, a motor for rotating 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 rotatable about the central axis, a stator disposed radially outside the rotor for rotating the rotor, and an inner housing that covers the rotor and the stator. The rotor has a shaft extending along the central axis, the shaft protruding outside the upper side of the inner housing, 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 downward, The inner housing is a covered cylindrical shape centered on the central axis, has a first inner housing that 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 is in contact with the first inner housing in the axial direction and the radial direction, and the axial contact position between the first inner housing and the second inner housing is above the lower end position of the stator. A blower.

[0103] (2) The motor has a circuit board connected to the stator and on which electronic components are mounted, and a heat dissipation member for the board. The circuit board is disposed below the second inner housing, and the heat dissipation member for the board is disposed axially between the second inner housing and the circuit board, contacts the second inner housing, and contacts the electronic components. The blower according to (1).

[0104] (3) The motor has a stator heat dissipation member, The stator heat dissipation member is disposed axially between the inner housing and the stator, contacts the inner housing, and contacts the stator, and is the air blower described in (1) or (2).

[0105] (4) The second inner housing, has a lower bearing that rotatably supports the lower end of the shaft, and a bearing recess that holds the lower bearing, and is the air blower described in any one of (1) to (3). The bearing recess opens upward, The lower bearing is fixed to the radially inner surface of the bearing recess, The second inner housing has a plurality of guides that project upward from the opening edge of the bearing recess, The guides have guide surfaces that extend from the radially inner surface of the bearing recess, The guide surfaces are inclined radially outward upward from the opening edge of the bearing recess, and are the air blower described in any one of (1) to (3).

[0106] (5) The stator, has an annular stator core centered on the central axis, and a coil, and is the air blower described in (4). The stator core, has an annular core back centered on the central axis, and a plurality of teeth that extend radially from the core back and are arranged at intervals in the circumferential direction, and is the air blower described in (4). The coil is disposed on the teeth, The guides are disposed circumferentially between one tooth and the other tooth adjacent in the circumferential direction as viewed axially, and are the air blower described in (4).

[0107] (6) An impeller rotatable about a central axis extending vertically, a motor that rotates the impeller, 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 includes: A rotor rotatable about the central axis, A stator disposed radially outside the rotor and rotating the rotor, A circuit board connected to the stator and on which electronic components are mounted, And an inner housing that covers the rotor and the stator, The rotor has a shaft extending along the central axis, The shaft projects outward above the inner housing, The impeller is fixed to the upper end portion of the shaft and rotates with the shaft to allow fluid to flow from above downward, The inner housing includes: 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 board cover, The circuit board is disposed below the second inner housing, The board cover covers the circuit board from below, The board 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 radially clamped by the clamping portion, The clamping portion includes: A first clamping portion disposed radially inside the clamped portion, And a second clamping portion disposed radially outside the clamped portion, The upper end position of the first clamping portion is above the upper end position of the second clamping portion. A blower.

[0108] (7) A vacuum cleaner comprising the blower according to any one of (1) to (6).

Industrial Applicability

[0109] The present invention can be used, for example, in a blower device mounted on a vacuum cleaner or the like.

Description of Signs

[0110] 1 Impeller 2 Motor 3 Inner housing 4 Outer housing 5 Heat dissipation member for substrate 6 Heat dissipation member for stator 10 Blower 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 part 301 Clamping part 312 Part to be clamped 322 Bearing recess 323 Guide 2211 Core back 2212 Teeth 3011 First clamping part 3012 Second clamping part 3230 Guide surface Bd Circuit board Br2 Lower bearing CA Central axis F Fluid MD Electronic component

Claims

1. An impeller rotatable about a vertically extending central axis, a motor for rotating 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, wherein the motor has a rotor rotatable about the central axis, a stator disposed radially outside the rotor for rotating the rotor, and an inner housing covering the rotor and the stator, the rotor has a shaft extending along the central axis, the shaft projects outward above the inner housing, the impeller is fixed to the upper end portion of the shaft and rotates with the shaft to allow fluid to flow from above downward, the inner housing is a covered cylindrical shape centered on the central axis, covers the stator from above, and has a first inner housing that covers the stator from the radially outer side, and a second inner housing that covers the stator from below, the second inner housing is in axial and radial contact with the first inner housing, and an axial contact position between the first inner housing and the second inner housing is above the lower end position of the stator. A blower.

2. The motor has a circuit board connected to the stator and on which electronic components are mounted, and a heat dissipation member for the substrate, the circuit board is disposed below the second inner housing, and the heat dissipation member for the substrate is disposed axially between the second inner housing and the circuit board, contacts the second inner housing, and contacts the electronic components. The blower according to claim 1.

3. The motor has a heat dissipation member for the stator, and the heat dissipation member for the stator is disposed axially between the inner housing and the stator, contacts the inner housing, and contacts the stator. The blower according to claim 1.

4. The second inner housing has a lower bearing for rotatably supporting the lower end portion of the shaft, and a bearing recess for holding the lower bearing, the bearing recess opens upward, the lower bearing is fixed to the radially inner surface of the bearing recess, the second inner housing has a plurality of guides projecting upward from the opening edge of the bearing recess, the guides have a guide surface extending from the radially inner surface of the bearing recess, and the guide surface is inclined radially outward upward from the opening edge of the bearing recess. The blower according to claim 1.

5. The stator includes: an annular stator core centered on the central axis; and a coil, and the stator core includes: an annular core back centered on the central axis; a plurality of teeth that extend radially from the core back and are spaced apart from each other in the circumferential direction, and the coil is disposed on the teeth, The blower according to claim 4, wherein the guide is disposed in the circumferential direction between one tooth and the other tooth adjacent to each other in the circumferential direction as viewed from the axial direction.

6. An impeller rotatable about a vertically extending central axis; a motor for rotating 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 includes: a rotor rotatable about the central axis; a stator disposed radially outside the rotor for rotating the rotor; a circuit board connected to the stator and on which electronic components are mounted; and an inner housing that covers the rotor and the stator, The rotor has a shaft extending along the central axis, the shaft projects above the outer side of the inner housing, 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 housing includes: a covered cylindrical shape centered on the central axis, a first inner housing that 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 board cover, the circuit board is disposed below the second inner housing, the board cover covers the circuit board from below, the board 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 radially clamped by the clamping portion, The clamping portion includes: a first clamping portion disposed radially inward of the clamped portion; and a second clamping portion disposed radially outward of the clamped portion, The blower, wherein an upper end position of the first clamping portion is higher than an upper end position of the second clamping portion.

7. A vacuum cleaner comprising the blower according to any one of claims 1 to 6.

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