Air supply device and dust collector

Abstract

The invention provides an air supply device and a dust collector. The air supply device is provided with a motor, an impeller, a first shell and a second shell. The motor includes a rotor having a shaft and a stator disposed radially outward of the rotor. The impeller is connected to the shaft and rotates about the shaft. The first housing is disposed between the motor and the impeller. The second housing is disposed on the opposite side of the first housing with the motor therebetween. The second housing includes a bearing holding portion, a stator holding portion, and a connecting portion. The bearing holding portion holds a bearing of the shaft. The stator holding portion is disposed outside the bearing holding portion in the radial direction of the shaft and holds the stator. The connecting portion connects the bearing holding portion and the stator holding portion. When the axial dimension of the shaft is set as a first dimension and the circumferential dimension of the shaft is set as a second dimension, the first dimension is smaller than the second dimension, and the connecting portion has a portion where the axial dimension is smaller than the first dimension.

Description

Technical Field

[0001] The invention relates to an air supply device and a dust collector. Background Art

[0002] In the past, as a housing structure of a motor mounted on an air supply device, there is a known structure in which the motor is clamped from both axial sides using two housing components (see Patent Document 1). In an air supply device having such a structure, as the motor rotates, an airflow is formed that flows from the housing component on one axial side into the housing to cool the motor.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Chinese Patent Application Publication No. 106849412 Summary of the invention

[0006] Problems to be solved by the invention

[0007] The area of ​​the shell component in the existing structure is relatively large when viewed from above, which easily becomes an obstacle to the cooling flow mentioned above. In order to take in more cooling flow, it is considered to reduce the area of ​​the shell component, but if the area of ​​the shell component is only reduced, the rigidity of the shell component will be reduced, and it is possible that the shell component will vibrate and make noise when the motor rotates.

[0008] Therefore, there is room for improvement in terms of enhancing the cooling effect of the motor while ensuring the rigidity of the housing.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an air supply device capable of improving the cooling effect of a motor while ensuring the rigidity of a casing.

[0010] Solutions to Solve Problems

[0011] An air supply device of one embodiment has a motor, an impeller, a first housing, and a second housing. The motor has: a rotor having an axis; and a stator arranged on the radially outer side of the rotor. The impeller is connected to the axis and rotates around the axis. The first housing is arranged between the motor and the impeller. The second housing is arranged on the side opposite to the first housing across the motor. The second housing has a bearing retaining portion, a stator retaining portion, and a connecting portion. The bearing retaining portion retains the bearing of the shaft. The stator retaining portion is arranged outside the bearing retaining portion in the radial direction of the shaft and retains the stator. The connecting portion connects the bearing retaining portion and the stator retaining portion. When the dimension of the end portion on the bearing retaining portion side of the connecting portion in the axial direction of the shaft is set to a first dimension and the dimension in the circumferential direction of the shaft is set to a second dimension, the first dimension is smaller than the second dimension, and the connecting portion has a portion whose axial dimension is smaller than the first dimension.

[0012] Effects of the Invention

[0013] According to one aspect of the embodiment, the cooling effect of the motor can be improved while ensuring the rigidity of the housing. In addition, the effects described here are not necessarily limited effects, and may be any effect described in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of the vacuum cleaner according to the embodiment.

[0015] Figure 2 It is a longitudinal sectional view of the air supply device in the embodiment.

[0016] Figure 3 It is a perspective view of the stator core according to the embodiment.

[0017] Figure 4 It is a perspective cross-sectional view of the first housing according to the embodiment.

[0018] Figure 5 It is a perspective view of the second housing according to the embodiment.

[0019] Figure 6 It is a top view of the second casing of the embodiment.

[0020] Fig. 7A It is an enlarged top view of the second casing of the embodiment.

[0021] Figure 7B It is an enlarged top view of the second casing of the embodiment.

[0022] Figure 8 It is an enlarged side view of the second housing of the embodiment.

[0023] Fig. 9 It is an enlarged side view of the second housing of the embodiment.

[0024] Fig.10 It is a plan view showing an example of the structure of the second housing, the stator core, and the coil according to the embodiment.

[0025] Fig.11 This is a side view of a connecting member of a second housing according to a modified example.

[0026] In the figure:

[0027] 1—vacuum cleaner, 2—housing, 3—air supply device, 30—impeller, 40—motor, 41—rotor, 42—stator, 43—bearing, 50—housing, 51—first housing, 52—second housing, 70—impeller cover, 411—shaft, 412—magnet, 421—stator core, 423—coil, 521—bearing retaining portion, 522—stator retaining portion, 523—substrate retaining portion, 524—connecting portion, 4211—core back, 4212—tooth, 5241—first connecting member, 5241a—rib, 5242—second connecting member, 5242a—rib, 5243—third connecting member, 5243a—rib. DETAILED DESCRIPTION

[0028] Hereinafter, the method for implementing the air supply device and the vacuum cleaner of the present invention (hereinafter, recorded as "implementation method") is described in detail with reference to the accompanying drawings. In addition, the present invention is not limited to the implementation method. In addition, each implementation method can be appropriately combined within the scope of the processing content not contradictory. In addition, in each of the following implementation methods, the same symbol is marked on the same part, and repeated description is omitted.

[0029] In the embodiments shown below, expressions such as "constant", "orthogonal", "perpendicular" or "parallel" are sometimes used, but these expressions do not need to be strictly "constant", "orthogonal", "perpendicular" or "parallel". That is, the above expressions allow for deviations such as manufacturing accuracy and setting accuracy.

[0030] In the embodiment shown below, the central axis C (see Figure 2 ) is called the “axial direction”, the direction perpendicular to the central axis C of the air supply device 3 is called the “radial direction”, and the direction along the arc centered on the central axis C of the air supply device 3 is called the “circumferential direction”.

[0031] In addition, in the following embodiments, for easy understanding, Figure 2 The upper side (Z-axis positive direction side) of the air supply device 3 in FIG. 1 , that is, the side where the impeller 30 is arranged is set as the "upper side" of the air supply device 3. In addition, the air supply device 3 is mounted on the vacuum cleaner 1 in a state where the upper side, that is, the impeller 30 side, faces downward. This positional relationship is only for explanation and does not limit the actual positional relationship and direction of the air supply device 3 and the vacuum cleaner 1.

[0032] In order to facilitate understanding of the description, in each of the drawings referred to below, the Z-axis direction may be defined and an orthogonal coordinate system may be shown in which the positive direction of the Z-axis is the vertical upward direction.

[0033] <Vacuum cleaner structure>

[0034] First, refer to Figure 1, the structure of the vacuum cleaner 1 to which the air supply device 3 according to the embodiment is applied will be described. Figure 1 It is a perspective view of the vacuum cleaner 1 according to the embodiment.

[0035] like Figure 1 As shown, the vacuum cleaner 1 has an air supply device 3. The vacuum cleaner 1 is a so-called pole-type electric vacuum cleaner. The vacuum cleaner 1 has a rechargeable battery (not shown) and operates by power supplied from the battery. However, the vacuum cleaner 1 may also have a power cord and operate by power supplied via a power cord connected to a power socket provided on the wall of the room. The vacuum cleaner 1 having the air supply device 3 is not limited to a pole-type, and may also be other types of electric vacuum cleaners such as a so-called robot type, a cylinder type, or a portable type.

[0036] The vacuum cleaner 1 has a housing 2. The housing 2 has an air intake section 21 and an exhaust section 22. An air passage (not shown) connecting the air intake section 21 and the exhaust section 22 is formed in the housing 2. In the air passage, a dust collecting section (not shown), a filter (not shown) and an air supply device 3 are sequentially arranged from the air intake section 21 toward the exhaust section 22. The air supply device 3 is arranged in the housing 2 with the impeller 30 side facing the air intake section 21. The air supply device 3 generates an airflow from the air intake section 21 toward the exhaust section 22 in the housing 2 by rotating the impeller 30. Dust and other garbage contained in the air circulating in the air passage are captured by the filter and gathered in the dust collecting section formed in a container shape. The dust collecting section and the filter are detachably arranged relative to the housing 2.

[0037] A grip 4 and an operating portion 5 are provided at the upper portion of the housing 2. The user can grip the grip 4 to move the vacuum cleaner 1. The operating portion 5 has a plurality of buttons 5a. The user operates the buttons 5a to set the actions of the vacuum cleaner 1. For example, by operating the buttons 5a, the start and stop of driving of the air supply device 3 and the change of the rotation speed are instructed. A rod-shaped suction pipe 6 is connected to the lower portion of the housing 2. In other words, the housing 2 is connected to one end of the suction pipe 6. At the other end of the suction pipe 6, a suction nozzle 7 is detachably mounted relative to the suction pipe 6. In addition, the other end of the suction pipe 6 is Figure 1 The lower end of the suction tube 6 is shown in the middle.

[0038] <Structure of air supply device>

[0039] Next, refer to Figure 2 The structure of the air blowing device 3 according to the embodiment will be described. Figure 2 : is a longitudinal sectional view of the air supply device 3 of the embodiment. Specifically, Figure 2 A longitudinal section of the air supply device 3 cut along a section passing through the central axis C is shown.

[0040] like Figure 2As shown, the air blowing device 3 includes an impeller 30 , a motor 40 , a housing 50 , a diffuser 60 , an impeller cover 70 , and a circuit board 80 .

[0041] The impeller 30 is arranged on the axial upper side of the motor 40. The impeller 30 is connected to a shaft 411 described later. The impeller 30 is rotated about the shaft 411 by the motor 40. The impeller 30 can be made of resin or metal, for example. The radial outer edge of the impeller 30 is circular in a plan view from the axial direction.

[0042] The motor 40 has a rotor 41 and a stator 42. The motor 40 also has a bearing 43.

[0043] The rotor 41 has a shaft 411 and a magnet 412. The shaft 411 is arranged along the central axis C extending vertically. That is, the motor 40 has the shaft 411 arranged along the central axis C. The shaft 411 is a cylindrical member made of, for example, metal. The impeller 30 is fixed to the circumference of the upper end of the shaft 411. In addition, the second bearing 43b described later is fixed to the circumference of the lower end of the shaft 411.

[0044] The magnet 412 has a cylindrical shape. The magnet 412 is arranged radially outward of the shaft 411 and fixed to the shaft 411. On the radial outer surface of the magnet 412, the N pole and the S pole of the magnet 412 are alternately arranged in the circumferential direction. Spacers 413 are respectively arranged at both end surfaces of the magnet 412 in the axial direction.

[0045] The stator 42 is an armature that generates magnetic flux according to a driving current. The stator 42 is radially opposed to the rotor 41. In the present embodiment, the stator 42 is arranged radially outward of the rotor 41. The stator 42 has a stator core 421 and an insulator 422. The stator 42 also has a coil 423.

[0046] The stator core 421 is a laminated body formed by stacking electromagnetic steel sheets in the axial direction. However, the stator core 421 may be a single component formed by, for example, sintering and casting a powder. The stator core 421 may also be formed by joining a plurality of core blocks. Figure 3 The structure of the stator core 421 according to the embodiment will be described. Figure 3 It is a perspective view of the stator core 421 according to the embodiment.

[0047] like Figure 3 As shown, the stator core 421 has a core back 4211 and a plurality of teeth 4212. The core back 4211 is centered on the central axis C (see Figure 2) as the center. The teeth 4212 extend radially inward from the core back 4211. A plurality of teeth 4212 are arranged circumferentially. In the present embodiment, the number of teeth 4212 is three. The three teeth 4212 are arranged at equal intervals in the circumferential direction. In addition, the number of teeth 4212 is not limited to three. Slots are provided between the teeth 4212 adjacent to each other in the circumferential direction. The coil 423 is arranged in the slot.

[0048] A plurality of cutouts 4213 are formed in the core back 4211. The cutouts 4213 penetrate the core back 4211 in the axial direction. The cutouts 2213 are arranged radially outward of the teeth 4212. The number of the cutouts 2213 is the same as the number of the teeth 4212. In the present embodiment, the number of the cutouts 2213 is three. However, the number of the cutouts 2213 is not limited to three. For example, the number of the cutouts 2213 may be different from the number of the teeth.

[0049] The insulator 422 covers at least a portion of the stator core 421. The insulator 422 is made of an insulating member such as resin. In the present embodiment, the insulator 422 includes a first insulator 422a and a second insulator 422b. The first insulator 422a covers the stator core 421 from above. The second insulator 422b covers the stator core 421 from below. However, the insulator 422 may be a structure integrated with the stator core 421 by insert molding.

[0050] In addition, in the present embodiment, the radially outer end surface of the core back 4211 and the radially inner end surface of the teeth 4212 are exposed without being covered by the insulator 422 .

[0051] The coil 423 is formed by winding a conductive wire around the stator core 421 through an insulator 422. Specifically, the coil 423 is formed by winding a conductive wire around each tooth 4212 through an insulator 422. That is, the stator 42 has a plurality of coils 423. The plurality of coils 423 are arranged at equal intervals in the circumferential direction. In this embodiment, the number of coils 423 is three (see Figure 6 ). However, the number of coils 423 is not limited to three.

[0052] The bearing 43 supports the rotor 41 so that it can rotate around the central axis C relative to the stator 42. In the present embodiment, the bearing 43 includes a first bearing 43a and a second bearing 43b. The first bearing 43a is arranged axially above the stator 42. In other words, the first bearing 43a is arranged between the shaft 411 and the impeller 30. The second bearing 43b is arranged axially below the stator 42. Specifically, the second bearing 43b is fixed to the circumferential surface of the lower end of the shaft 411 as described above.

[0053] The first bearing 43a and the second bearing 43b are, for example, rolling bearings. The first bearing 43a and the second bearing 43b, which are rolling bearings, respectively have an inner ring (not shown) and an outer ring (not shown). The inner ring is arranged radially outward of the shaft 411 and fixed to the shaft 411. The outer ring is arranged radially outward of the inner ring and fixed to the first housing 51 or the second housing 52. Rolling components such as balls (not shown) are arranged radially between the inner ring and the outer ring. The inner ring is configured to be rotatable relative to the outer ring. The number and type of bearings 43 can be changed according to the structure of this embodiment. The motor 40 can also have a sleeve bearing or the like instead of a rolling bearing.

[0054] The housing 50 surrounds at least a portion of the motor 40. The housing 50 is made of, for example, a metal such as aluminum. However, the housing 50 may also be made of a material other than metal such as resin. In the present embodiment, the housing 50 includes a first housing 51 and a second housing 52. The first housing 51 is disposed between the motor 40 and the impeller 30, and covers the axial upper portion of the motor 40. The second housing 52 is disposed on the side opposite to the first housing 51, i.e., the axial lower portion of the motor 40, across the motor 40. The detailed structures of the first housing 51 and the second housing 52 will be described later.

[0055] The diffuser 60 is disposed axially below the impeller 30. The diffuser 60 is a member surrounding the upper portion and radially outward portion of the first housing 51, and is fixed to the first housing 51 by bolts or other fixing means (not shown).

[0056] The diffuser 60 has two cylindrical parts (respectively recorded as "inner circumferential side cylinder 60a" and "outer circumferential side cylinder 60b") arranged concentrically around the central axis C. The gap between the inner circumferential side cylinder 60a and the outer circumferential side cylinder 60b functions as a part of the flow path of the gas, and the lower end of the above gap in the axial direction becomes the outlet of the flow path, that is, the exhaust port 60d of the gas. A plurality of stationary blades 60c are provided in the gap between the inner circumferential side cylinder 60a and the outer circumferential side cylinder 60b. The inner circumferential side cylinder 60a and the outer circumferential side cylinder 60b are connected by a plurality of stationary blades 60c.

[0057] The air blowing device 3 includes the diffuser 60, and thereby can rectify the airflow flowing through the air blowing device 3 and make the airflow flow smoothly. The diffuser 60 can be made of, for example, resin or metal.

[0058] The impeller cover 70 is a radially outer member surrounding the impeller 30. The impeller cover 70 can be made of, for example, resin or metal. The impeller cover 70 is cylindrical and tapered upward with the central axis C as the center. The radial inner surface of the impeller cover 70 contacts the radial outer surface of the diffuser 60. The impeller cover 70 is fixed to the diffuser 60.

[0059] The impeller cover 70 forms a gas flow path together with the diffuser 60. In other words, the diffuser 60 and the impeller cover 70 are examples of flow path forming members. The impeller cover 70 has an air inlet 70a at an end portion on one side in the axial direction.

[0060] The circuit board 80 is located on the opposite side of the motor 40 across the second housing 52. The circuit board 80 is fixed to the second housing 52. Specifically, the circuit board 80 is fixed to the plurality of board holding portions 523 of the second housing 52. Circuits for driving the motor 40, such as a power supply circuit and a control circuit, are formed on the circuit board 80.

[0061] In the air blowing device 3 configured as described above, as the impeller 30 rotates, an air flow 100 is formed which flows in from the air inlet 70 a of the impeller cover 70 and is exhausted from the air outlet 60 d of the diffuser 60 .

[0062] Furthermore, in the air supply device 3, in addition to the above-mentioned airflow 100, an airflow 200 is formed. The airflow 200 flows in from the gap between the connecting parts 524 of the second housing 52, and flows out from the gap between the stator 42 and the first housing 51 through the gap between the teeth 4212 of the stator core 421. The airflow 200 is, for example, an airflow generated with negative pressure generated by the airflow 100. The airflow 200 functions as cooling wind for cooling the circuit board 80 and the motor 40.

[0063] <Structure of the first housing>

[0064] Next, refer to Figure 4 The structure of the first housing 51 according to the embodiment will be described. Figure 4 2 is a perspective cross-sectional view of the first housing 51 of the embodiment. Figure 4 As shown, the first housing 51 has a bearing holding portion 511 , a stator holding portion 512 , a coupling portion 513 , and a connecting portion 514 .

[0065] The bearing retaining portion 511 retains the first bearing 43a of the motor 40. The bearing retaining portion 511 is a cylindrical portion extending in the axial direction. The first bearing 43a is arranged radially inward of the bearing retaining portion 511. The stator retaining portion 512 is arranged radially outward of the bearing retaining portion 511 and retains the stator 42. A plurality of (here three) stator retaining portions 512 are arranged at equal intervals in the circumferential direction. The number of stator retaining portions 512 only needs to be the same as the number of stators 42, and does not necessarily need to be three.

[0066] The connecting portion 513 connects the bearing holding portion 511 and the stator holding portion 512. The number of the connecting portions 513 is the same as the number of the stator holding portion 512. The plurality of connecting portions 513 are arranged at equal intervals in the circumferential direction. In the present embodiment, the number of the connecting portions 513 is three, but the number of the connecting portions 513 is not limited to three. The connecting portion 513 has a rib 513a protruding from the end surface in the axial direction.

[0067] The connection portion 514 is located radially outward of the stator holding portion 512. The connection portion 514 is a cylindrical portion extending in the axial direction. The radially outer side surface of the connection portion 514 is aligned with the diffuser 60 (see Figure 2 ) are connected.

[0068] <Structure of the second housing>

[0069] Next, refer to Figures 5 to 9 The structure of the second housing 52 according to the embodiment will be described. Figure 5 It is a perspective view of the second housing 52 according to the embodiment. Figure 6 It is a top view of the second housing 52 according to the embodiment. Fig. 7A and Figure 7B It is an enlarged plan view of the second housing 52 according to the embodiment. Figure 8 and Fig. 9 It is an enlarged side view of the second housing 52 of the embodiment.

[0070] like Figure 5 and Figure 6 As shown, the second housing 52 has a bearing holding portion 521 , a stator holding portion 522 , a substrate holding portion 523 , and a connecting portion 524 .

[0071] The bearing holding portion 521 holds the second bearing 43b of the motor 40. The bearing holding portion 521 is a cylindrical portion having a through hole 521a extending in the axial direction. A bushing 44 is arranged radially inward of the bearing holding portion 521 (see Figure 2 ). The second bearing 43b is supported by the radial inner side surface of the bushing 44. When the second housing 52 is viewed from above, the radius of the bearing holding portion 521 is, for example, 8 cm. In addition, the radius of the bearing holding portion 521 may be greater than 8 cm or less than 8 cm.

[0072] The stator holding portion 522 is arranged radially outward of the bearing holding portion 521 and holds the stator 42. The stator holding portion 522 is a pedestal portion that supports the lower surface and radial outer surface of the stator core 421 of the stator 42. The stator holding portion 522 has a through hole 522a extending in the axial direction. A bolt (not shown) is inserted through the through hole 522a. In addition, the bolt is also inserted through the through hole 512a of the stator holding portion 512 of the first housing 51 (see Figure 4). The first housing 51 and the second housing 52 are fastened by bolts, thereby fixing the motor 40 sandwiched between the first housing 51 and the second housing 52. In addition, the bolts are arranged in the notch 4213 of the stator core 421 (see Figure 3 ). Thus, the positional deviation of the motor 40 can be appropriately suppressed.

[0073] like Figure 5 As shown, a plurality of (here, three) stator holding portions 522 are arranged at equal intervals in the circumferential direction. The number of stator holding portions 522 is not limited to three. The substrate holding portion 523 holds the circuit substrate 80. The substrate holding portion 523 is arranged at a position offset in the circumferential direction relative to the stator holding portion 522. The number of substrate holding portions 523 is the same as the number of stator holding portions 522. In the present embodiment, the number of substrate holding portions 523 is three, but the number of substrate holding portions 523 is not limited to three.

[0074] The connection part 524 connects the bearing holding part 521 and the stator holding part 522. The number of the connection parts 524 is the same as the number of the stator holding parts 522. The plurality of connection parts 524 are arranged at equal intervals in the circumferential direction. In the present embodiment, the number of the connection parts 524 is three, but the number of the connection parts 524 is not limited to three.

[0075] Here, the airflow 200 is efficiently supplied to the motor 40 (see Figure 2 ) In this regard, the area of ​​the second housing 52 when viewed from above is preferably smaller. Specifically, the smaller the area of ​​the second housing 52 when viewed from above, the more flow paths of the airflow 200 can be ensured, so the smaller the area of ​​the second housing 52 when viewed from above, the better. On the other hand, when the area of ​​the second housing 52 is reduced, the rigidity of the second housing 52 is reduced, and vibration and noise of the second housing 52 may be generated when the motor 40 rotates.

[0076] Therefore, the second housing 52 of the embodiment is configured such that, when the axial dimension of the end portion of the connecting portion 524 on the bearing retaining portion 521 side is set as the first dimension S1 and the circumferential dimension is set as the second dimension S2, the first dimension S1 is smaller than the second dimension S2. In addition, the second housing 52 of the embodiment is configured such that the axial dimension of the connecting portion 524 is smaller than the first dimension S1.

[0077] Thus, by making the first dimension S1 relatively large, the strength of the bearing holding portion 521 side that is easily subjected to the vibration when the motor 40 rotates can be increased, and the vibration when the motor 40 rotates can be reduced. Therefore, the rigidity of the second housing 52 can be ensured while the cooling effect of the motor 40 can be improved. In addition, by providing a portion whose axial dimension is smaller than the first dimension S1 in the connecting portion 524, the second housing 52 can be made lighter than the case where the axial dimension is unified to the first dimension S1. In addition, by making the first dimension S1 smaller than the second dimension S2, the height dimension of the second housing 52 can be suppressed.

[0078] Specifically, if Figure 8 As shown in FIG. 1 , the axial dimension of the connection portion 524 increases as it approaches the end portion A2 on the bearing holding portion 521 side. The lower surface 524d of the connection portion 524 is curved in an arch shape within the size range of the bearing holding portion 521 so that the axial dimension of the connection portion 524 increases as it approaches the end portion A2 on the bearing holding portion 521 side. More specifically, the lower surface 524d of the connection portion 524 is curved within the size range of the bearing holding portion 521 so that it protrudes axially downward as it approaches the end portion A2 on the bearing holding portion 521 side.

[0079] Thus, the rigidity of the bearing holding portion 521 and the surrounding area that are susceptible to vibration when the motor 40 rotates can be enhanced. Therefore, the vibration of the second housing 52 when the motor 40 rotates can be reduced. In addition, by forming the lower surface 524d of the connecting portion 524 into a curved shape, the rigidity of the second housing 52 can be enhanced compared to the case of a flat shape.

[0080] In addition, Figure 8 , the lower surface 524d of the connection portion 524 is curved, but the present invention is not limited thereto. For example, the upper surface 524c of the connection portion 524 may be curved in such a manner that the dimension of the connection portion 524 in the axial direction increases toward the end portion A2 on the bearing holding portion 521 side. In addition, both the upper surface 524c and the lower surface 524d of the connection portion 524 may be curved.

[0081] like Fig. 7A As shown in FIG. 1 , when the dimension in the circumferential direction of the end portion of the connection portion 524 on the stator holding portion 522 side is defined as the third dimension S3 , the second dimension S2 is smaller than the third dimension S3 .

[0082] Thus, more flow paths of the airflow 200 can be ensured in the central portion of the motor 40 where heat is easily accumulated, and the airflow 200 can easily flow in the central portion of the motor 40 , thereby improving the heat dissipation performance of the motor 40 .

[0083] Next, the specific structure of the connection part 524 is described. The connection part 524 has a plurality of connection members 5241 to 5243 and a plurality of through holes 524a and 524b. One end of the plurality of connection members 5241 to 5243 is connected to the stator holding part 522, and the other end is connected to the bearing holding part 521. The plurality of connection members 5241 to 5243 are arranged in a circumferential direction.

[0084] In this embodiment, the plurality of connecting members 5241 to 5243 include a first connecting member 5241, a second connecting member 5242, and a third connecting member 5243. Figure 7B As shown in FIG. 1 , when the second housing 52 is viewed from above, the first connecting member 5241 is disposed on an imaginary straight line L1 connecting the center of the stator holding portion 522 and the center of the bearing holding portion 521. Here, the center of the stator holding portion 522 is, for example, the center P1 of the through hole 522a of the stator holding portion 522. In addition, the center of the bearing holding portion 521 is, for example, the center P2 of the through hole 521a of the bearing holding portion 521.

[0085] By arranging one of the plurality of connection members 5241 to 5243 on the virtual straight line L1 , it is possible to enhance the rigidity of a portion of the connection portion 524 that is most susceptible to vibration due to the rotation of the motor 40 .

[0086] The second connection member 5242 is disposed adjacent to the first connection member 5241 on one side in the circumferential direction. The third connection member 5243 is disposed adjacent to the first connection member 5241 on the other side in the circumferential direction.

[0087] like Fig. 7A As shown, when the dimension of the end portion on the stator retaining portion 522 side among the circumferential dimensions of the plurality of connecting parts 5241 to 5243 is set to a fourth dimension S4 and the dimension of the end portion on the bearing retaining portion 521 side is set to a fifth dimension S5, the fifth dimension S5 may be greater than the fourth dimension S4.

[0088] This makes it possible to easily send air to the center of the motor 40 and to enhance the rigidity of the periphery of the bearing holding portion 521 .

[0089] like Fig. 7A As shown, when the circumferential dimension of the first connection member 5241 is set to a sixth dimension S6, the sixth dimension S6 may be larger than the fifth dimension S5 of the second connection member 5242 or the third connection member 5243.

[0090] This can enhance the rigidity of the portion of the connection portion 524 that is most susceptible to vibration due to the rotation of the motor 40 .

[0091] like Figure 6As shown, when looking down at the second shell 52, an imaginary straight line L2 passing through the center of the second connecting part 5242 and extending along the length direction of the second connecting part 5242 and an imaginary straight line L3 passing through the center of the third connecting part 5243 and extending along the length direction of the third connecting part 5243 intersect at a position farther away from the connecting part 524 than the center of the bearing retaining part 521.

[0092] Assuming that the imaginary straight line L2 and the imaginary straight line L3 intersect at a position closer to the connecting portion 524 than the center of the bearing retaining portion 521, the circumferential dimension of the end of the connecting portion 524 on the bearing retaining portion 521 side is insufficient, and the rigidity of the second housing 52 may be reduced. Therefore, by adopting a structure in which the imaginary straight line L2 and the imaginary straight line L3 intersect at a position farther from the connecting portion 524 than the center of the bearing retaining portion 521 as described above, the circumferential dimension of the end of the connecting portion 524 on the bearing retaining portion 521 side becomes larger, so that the rigidity of the second housing 52 can be strengthened.

[0093] like Figure 7B , Figure 8 As shown, the plurality of connection members 5241 to 5243 respectively have ribs 5241 a to 5243 a protruding from the end surface on the impeller 30 side among the end surfaces in the axial direction.

[0094] The rib 5241a of the first connecting member 5241 extends along the imaginary straight line L1. In contrast, the rib 5242a of the second connecting member 5242 and the rib 5243a of the third connecting member 5243 extend in a direction away from the imaginary straight line L1 as they move from the stator holding portion 522 side toward the bearing holding portion 521 side. In this way, the ribs 5241a to 5243a extend along the bending direction of the second housing 52, so that the second housing 52 has a shape that resists bending, and the rigidity of the second housing 52 can be improved.

[0095] When the dimension in the length direction of the rib 5241a of the first connecting member 5241 is set to the seventh dimension S7, and the dimension in the length direction of the rib 5242a of the second connecting member 5242 or the rib 5243a of the third connecting member 5243 is set to the eighth dimension S8, the seventh dimension S7 may be larger than the eighth dimension S8. In addition, when the dimension in the circumferential direction of the rib 5241a of the first connecting member 5241 is set to the ninth dimension S9, and the dimension in the circumferential direction of the rib 5242a of the second connecting member 5242 or the rib 5243a of the third connecting member 5243 is set to the tenth dimension S10, the ninth dimension S9 may be larger than the tenth dimension S10. In addition, as Figure 8 As shown, the rib 5241 a of the first connecting member 5241 may have a larger axial dimension than the rib 5242 a of the second connecting member 5242 or the rib 5243 a of the third connecting member 5243 .

[0096] This can further enhance the rigidity of the first connection member 5241 that easily receives vibration caused by the rotation of the motor 40 .

[0097] like Figure 7B , Fig. 9 As shown in FIG. 1 , the apex V of the rib 5241a of the first connecting member 5241 in the axial direction may be offset from the imaginary straight line L1 to the substrate holding portion 523. Since the stator holding portion 522 and the substrate holding portion 523 are arranged staggered in the circumferential direction, the center of gravity is located between the stator holding portion 522 and the substrate holding portion 523. By locating the apex V of the rib 5241a at a position close to the center of gravity, the second housing 52 can be structurally stabilized and the rigidity of the second housing 52 can be enhanced.

[0098] like Figure 7B As shown, the rib 5241a of the first connecting member 5241 may have one end located at the stator holding portion 522 side of the first connecting member 5241 in the direction along the imaginary straight line L1, and the other end located closer to the bearing holding portion 521 than the radial center P3 of the first connecting member 5241. Thus, the rigidity of the second housing 52 can be enhanced.

[0099] With the end surface of the connecting parts 5241 to 5243 on the impeller 30 side as a reference, the protruding height H1 of the ribs 5241a to 5243a is less than half of the protruding height H2 of the stator holding portion 522. As a result, the stator 42 and the ribs 5241a to 5243a are unlikely to interfere with each other. In addition, the axial height dimension of the motor 40 can be reduced while maintaining the strength of the stator holding portion 522.

[0100] The plurality of through holes 524a and 524b are disposed between the plurality of connecting parts 5241 to 5243. Specifically, the through hole 524a is located between the connecting part 5241 and the connecting part 5243, and the through hole 524b is located between the connecting part 5241 and the connecting part 5242. Figure 6 As shown, the dimensions of the plurality of through holes 524 a and 524 b in the circumferential direction decrease from the stator holding portion 522 side toward the bearing holding portion 521 side.

[0101] In this way, the second housing 52 has the through holes 524a and 524b, so that the weight of the second housing 52 can be reduced. In addition, the airflow 200 can flow smoothly, and the heat dissipation performance of the motor 40 can be improved.

[0102] In addition, as described above, the substrate holding portion 523 is disposed at a position offset in the circumferential direction with respect to the stator holding portion 522. Thus, the second housing 52 can be made smaller in size compared to the case where the substrate holding portion 523 and the stator holding portion 522 are arranged in the radial direction.

[0103] Next, refer to Fig.10 The positional relationship among the second housing 52 , the stator core 421 , and the coil 423 according to the embodiment will be described. Fig.10 It is a plan view showing an example of the structure of the second housing 52 , the stator core 421 , and the coil 423 according to the embodiment.

[0104] like Fig.10 As shown, when the second housing 52 is viewed from above, the connecting portion 524 can be connected to the teeth 4212 of the stator core 421 (see Figure 3 ) and the coil 423. In other words, the connecting portion 524 is arranged in a manner that does not overlap with the slots between the teeth 4212 of the stator core 421.

[0105] Thus, the airflow 200 (refer to Figure 2 ) is not easily blocked by the connecting portion 524, which can improve the heat dissipation performance of the motor 40.

[0106] As described above, the second housing 52 in the embodiment is configured such that, when the axial dimension of the end portion of the connecting portion 524 on the bearing retaining portion 521 side is set as the first dimension S1 and the circumferential dimension is set as the second dimension S2, the first dimension S1 is smaller than the second dimension S2. In addition, the second housing 52 in the embodiment is configured to have a portion where the axial dimension of the connecting portion 524 is smaller than the first dimension S1.

[0107] By relatively increasing the first dimension S1 in this way, the strength of the bearing holding portion 521 side that is easily subjected to vibration when the motor 40 rotates can be increased, and the vibration when the motor 40 rotates can be reduced. Therefore, the rigidity of the second housing 52 can be ensured while the cooling effect of the motor 40 can be improved. In addition, by providing a portion whose axial dimension is smaller than the first dimension S1 in the connecting portion 524, the second housing 52 can be made lighter than when the axial dimension is unified to the first dimension S1. In addition, by making the first dimension S1 smaller than the second dimension S2, the height dimension of the second housing 52 can be suppressed.

[0108] <Modification example: Modification example of rib shape>

[0109] Fig.11 1 is a side view of the connecting member 5242 of the second housing 52 of the modified example. Fig.11 As shown, the rib 5242a of the connecting member 5242 may be recessed relative to the line L4 at both ends of the end surface of the connecting rib 5242a located on the impeller 30 side.

[0110] Thus, the rib 5242a (see FIG. 5A ) of the connecting member 5242 in the second housing 52 of the embodiment is connected to the rib 5242a (see FIG. 5B ) of the connecting member 5242 in the second housing 52 of the embodiment. Figure 5) compared to the embodiment, the rib 5242a is less likely to interfere with the stator 42. In addition, the second housing 52 can be made lighter than the second housing 52 of the embodiment.

[0111] In addition, the rib 5241a may be provided between the end portion of the connection member 5241 on the stator holding portion 522 side and the end portion on the bearing holding portion 521 side. Thus, the rigidity of the second housing 52 can be enhanced.

[0112] Although the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

[0113] Those skilled in the art can easily derive further effects and variations. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Therefore, various changes can be made without departing from the spirit or scope of the overall inventive concept defined by the scope of the attached invention and its equivalents.

[0114] Furthermore, the present technology can adopt the following structures.

[0115] (1) An air supply device comprising:

[0116] A motor having a rotor and a stator, wherein the rotor has a shaft and the stator is arranged radially outside the rotor;

[0117] an impeller connected to the shaft and rotating around the shaft;

[0118] A first housing is disposed between the motor and the impeller; and

[0119] a second housing disposed on the opposite side of the first housing across the motor;

[0120] The second housing has:

[0121] A bearing holding portion that holds the bearing of the shaft;

[0122] a stator holding portion disposed outside the bearing holding portion in a radial direction of the shaft and holding the stator; and

[0123] a connecting portion connecting the bearing holding portion and the stator holding portion,

[0124] When the dimension of the end portion of the connecting portion on the bearing holding portion side is a first dimension and the dimension of the circumferential direction of the shaft is a second dimension, the first dimension is smaller than the second dimension.

[0125] The connecting portion has a portion whose dimension in the axial direction is smaller than the first dimension.

[0126] (2) The air supply device according to (1), wherein:

[0127] A dimension of the connection portion in the axial direction increases toward an end portion on the bearing holding portion side.

[0128] (3) The air supply device according to (1) or (2), wherein:

[0129] One or the other surface of the connecting portion in the axial direction is curved within a range of a dimension of the bearing holding portion in the axial direction so that the dimension of the connecting portion in the axial direction increases toward an end portion on the bearing holding portion side.

[0130] (4) The air supply device according to any one of (1) to (3), wherein:

[0131] When the dimension in the circumferential direction of the end portion of the connection portion on the stator holding portion side is set as a third dimension, the second dimension is smaller than the third dimension.

[0132] (5) The air supply device according to any one of (1) to (4), wherein:

[0133] The connecting portion includes a plurality of connecting members, one end of which is connected to the stator holding portion and the other end of which is connected to the bearing holding portion.

[0134] When the dimension of the end portion on the stator holding portion side among the dimensions in the circumferential direction of the plurality of connection members is set as a fourth dimension and the dimension of the end portion on the bearing holding portion side is set as a fifth dimension, the fifth dimension is equal to or greater than the fourth dimension.

[0135] (6) The air supply device according to any one of (1) to (5), wherein:

[0136] The connecting portion includes a plurality of connecting members, one end of which is connected to the stator holding portion and the other end of which is connected to the bearing holding portion.

[0137] When the second housing is viewed in plan, one of the plurality of connection members is disposed on a virtual straight line connecting a center of the stator holding portion and a center of the bearing holding portion.

[0138] (7) The air supply device according to (6), wherein:

[0139] The dimension of the connection member arranged on the virtual straight line in the circumferential direction is larger than the dimensions of the other connection members in the circumferential direction.

[0140] (8) The air supply device according to (6) or (7), wherein:

[0141] The above-mentioned multiple connecting components include:

[0142] A first connecting member, which is arranged on the above-mentioned imaginary straight line;

[0143] a second connecting member disposed adjacent to the first connecting member on one side in the circumferential direction; and

[0144] a third connecting member disposed adjacent to the first connecting member on the other side in the circumferential direction,

[0145] When looking down at the second shell, an imaginary straight line passing through the center of the second connecting member and extending along the length direction of the second connecting member and an imaginary straight line passing through the center of the third connecting member and extending along the length direction of the third connecting member intersect at a position farther from the connecting portion than the center of the bearing retaining portion.

[0146] (9) The air supply device according to any one of (6) to (8), wherein:

[0147] The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction,

[0148] The dimension of the rib in the longitudinal direction of the connecting member disposed on the imaginary straight line is larger than the dimension of the rib in the longitudinal direction of the other connecting members.

[0149] (10) The air supply device according to any one of (6) to (9), wherein:

[0150] The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction,

[0151] The dimension of the rib of the connecting member disposed on the imaginary straight line in the circumferential direction is larger than the dimension of the rib of the other connecting members in the circumferential direction.

[0152] (11) The air supply device according to any one of (6) to (10), wherein:

[0153] The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction,

[0154] The above-mentioned multiple connecting components include:

[0155] A first connecting member, which is arranged on the above-mentioned imaginary straight line;

[0156] a second connecting member disposed adjacent to the first connecting member on one side in the circumferential direction; and

[0157] a third connecting member disposed adjacent to the first connecting member on the other side in the circumferential direction,

[0158] The rib of the first connecting member extends along the imaginary straight line.

[0159] The rib included in the second connection member and the rib included in the third connection member extend in a direction away from the imaginary straight line as they move from the stator holding portion side toward the bearing holding portion side.

[0160] (12) The air supply device according to any one of (9) to (11), wherein:

[0161] A protruding height of the rib with respect to an end surface of the connecting member on the impeller side is equal to or less than half of a protruding height of the stator holding portion with respect to the end surface of the connecting member on the impeller side.

[0162] (13) The air supply device according to any one of (1) to (12), wherein:

[0163] A circuit substrate is also provided, the circuit substrate being located on the side opposite to the motor across the second housing.

[0164] The second housing has a substrate holding portion for holding the circuit substrate.

[0165] The substrate holding portion is disposed at a position offset in the circumferential direction with respect to the stator holding portion.

[0166] (14) The air supply device according to (13), wherein:

[0167] The connecting portion includes a plurality of connecting members, one end of which is connected to the stator holding portion and the other end of which is connected to the bearing holding portion.

[0168] The above-mentioned multiple connecting parts have:

[0169] a first connecting member disposed on an imaginary straight line connecting the center of the stator holding portion and the center of the bearing holding portion when the second housing is viewed from above;

[0170] a second connecting member disposed adjacent to the first connecting member on one side in the circumferential direction; and

[0171] a third connecting member disposed adjacent to the first connecting member on the other side in the circumferential direction,

[0172] The first connecting member, the second connecting member, and the third connecting member each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction.

[0173] When the second housing is viewed in plan, a vertex in the axial direction of the rib included in the first connection member is offset toward the substrate holding portion from the imaginary straight line.

[0174] (15) The air supply device according to any one of (6) to (14), wherein:

[0175] The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction,

[0176] The rib of the connecting member disposed on the imaginary straight line has one end located on the stator holding portion side of the connecting member in the direction along the imaginary straight line, and the other end located on the bearing holding portion side relative to the radial center of the connecting member.

[0177] (16) The air supply device according to any one of (6) to (15), wherein:

[0178] The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction,

[0179] The rib included in the connection member disposed on the virtual straight line is provided between an end portion of the connection member on the stator holding portion side and an end portion of the connection member on the bearing holding portion side.

[0180] (17) The air supply device according to any one of (6) to (16), wherein:

[0181] The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction,

[0182] When the connecting member is viewed from the side, the rib included in the connecting member disposed on the virtual straight line is recessed relative to a line connecting both ends of the end surface of the rib on the impeller side.

[0183] (18) The air supply device according to any one of (1) to (17), wherein:

[0184] The above stator has:

[0185] The back of the core is cylindrical;

[0186] a plurality of teeth extending radially inward from the core back and arranged at equal intervals in the circumferential direction; and

[0187] a coil wound around the teeth,

[0188] When the second housing is viewed in plan, the connecting portion overlaps with the teeth and the coil.

[0189] (19) The air supply device according to any one of (1) to (18), wherein:

[0190] A flow path forming member is further provided, the flow path forming member surrounds the impeller and the radially outer side of the first housing, has an air intake port at one end portion in the axial direction, and has an air discharge port at the other end portion,

[0191] The above stator has:

[0192] a cylindrical core back; and

[0193] A plurality of teeth extending radially inward from the core back and arranged at equal intervals in the circumferential direction,

[0194] The second housing includes a plurality of the connecting portions arranged in the circumferential direction at intervals from each other.

[0195] As the impeller rotates, an airflow is formed that flows in from the air intake port and is discharged from the air discharge port, and an airflow is formed that flows in from the gap between the connecting parts and flows out from the gap between the stator and the first housing through the gap between the teeth.

[0196] (20) A vacuum cleaner comprising the air supply device according to any one of (1) to (19).

Claims

1. An air supply device, characterized in that: have: A motor having a rotor and a stator, wherein the rotor has a shaft and the stator is arranged radially outside the rotor; an impeller connected to the shaft and rotating around the shaft; A first housing is disposed between the motor and the impeller; and a second housing disposed on the opposite side of the first housing across the motor; The second housing has: A bearing holding portion that holds the bearing of the shaft; a stator holding portion disposed outside the bearing holding portion in a radial direction of the shaft and holding the stator; and a connecting portion connecting the bearing holding portion and the stator holding portion, When the dimension of the end portion of the connecting portion on the bearing holding portion side is a first dimension and the dimension of the circumferential direction of the shaft is a second dimension, the first dimension is smaller than the second dimension. The connecting portion has a portion whose dimension in the axial direction is smaller than the first dimension.

2. The air supply device according to claim 1, characterized in that: A dimension of the connection portion in the axial direction increases toward an end portion on the bearing holding portion side.

3. The air supply device according to claim 2, characterized in that: One or the other surface of the connecting portion in the axial direction is curved within a range of a dimension of the bearing holding portion in the axial direction so that the dimension of the connecting portion in the axial direction increases toward an end portion on the bearing holding portion side.

4. The air supply device according to claim 1, characterized in that: When the dimension in the circumferential direction of the end portion of the connection portion on the stator holding portion side is set as a third dimension, the second dimension is smaller than the third dimension.

5. The air supply device according to claim 4, characterized in that: The connecting portion includes a plurality of connecting members, one end of which is connected to the stator holding portion and the other end of which is connected to the bearing holding portion. When the dimension of the end portion on the stator holding portion side among the dimensions in the circumferential direction of the plurality of connection members is set as a fourth dimension and the dimension of the end portion on the bearing holding portion side is set as a fifth dimension, the fifth dimension is equal to or greater than the fourth dimension.

6. The air supply device according to claim 1, characterized in that: The connecting portion includes a plurality of connecting members, one end of which is connected to the stator holding portion and the other end of which is connected to the bearing holding portion. When the second housing is viewed in plan, one of the plurality of connection members is disposed on a virtual straight line connecting a center of the stator holding portion and a center of the bearing holding portion.

7. The air supply device according to claim 6, characterized in that: The dimension of the connection member arranged on the virtual straight line in the circumferential direction is larger than the dimensions of the other connection members in the circumferential direction.

8. The air supply device according to claim 6, characterized in that: The above-mentioned multiple connecting components include: A first connecting member, which is arranged on the above-mentioned imaginary straight line; a second connecting member disposed adjacent to the first connecting member on one side in the circumferential direction; and a third connecting member disposed adjacent to the first connecting member on the other side in the circumferential direction, When looking down at the second shell, an imaginary straight line passing through the center of the second connecting member and extending along the length direction of the second connecting member and an imaginary straight line passing through the center of the third connecting member and extending along the length direction of the third connecting member intersect at a position farther from the connecting portion than the center of the bearing retaining portion.

9. The air supply device according to claim 6, characterized in that: The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction, The dimension of the rib in the longitudinal direction of the connecting member disposed on the imaginary straight line is larger than the dimension of the rib in the longitudinal direction of the other connecting members.

10. The air supply device according to claim 6, characterized in that: The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction, The dimension of the rib of the connecting member disposed on the imaginary straight line in the circumferential direction is larger than the dimension of the rib of the other connecting members in the circumferential direction.

11. The air supply device according to claim 6, characterized in that: The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction, The above-mentioned multiple connecting components include: A first connecting member, which is arranged on the above-mentioned imaginary straight line; a second connecting member disposed adjacent to the first connecting member on one side in the circumferential direction; and a third connecting member disposed adjacent to the first connecting member on the other side in the circumferential direction, The rib of the first connecting member extends along the imaginary straight line. The rib included in the second connection member and the rib included in the third connection member extend in a direction away from the imaginary straight line as they move from the stator holding portion side toward the bearing holding portion side.

12. The air supply device according to claim 9, characterized in that: A protruding height of the rib with respect to an end surface of the connecting member on the impeller side is equal to or less than half of a protruding height of the stator holding portion with respect to the end surface of the connecting member on the impeller side.

13. The air supply device according to claim 1, characterized in that: A circuit substrate is also provided, the circuit substrate being located on the side opposite to the motor across the second housing. The second housing has a substrate holding portion for holding the circuit substrate. The substrate holding portion is disposed at a position offset in the circumferential direction with respect to the stator holding portion.

14. The air supply device according to claim 13, characterized in that: The connecting portion includes a plurality of connecting members, one end of which is connected to the stator holding portion and the other end of which is connected to the bearing holding portion. The above-mentioned multiple connecting parts have: a first connecting member disposed on an imaginary straight line connecting the center of the stator holding portion and the center of the bearing holding portion when the second housing is viewed from above; a second connecting member disposed adjacent to the first connecting member on one side in the circumferential direction; and a third connecting member disposed adjacent to the first connecting member on the other side in the circumferential direction, The first connecting member, the second connecting member, and the third connecting member each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction. When the second housing is viewed in plan, a vertex in the axial direction of the rib included in the first connection member is offset toward the substrate holding portion from the imaginary straight line.

15. The air supply device according to claim 6, characterized in that: The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction, The rib of the connecting member disposed on the imaginary straight line has one end located on the stator holding portion side of the connecting member in the direction along the imaginary straight line, and the other end located on the bearing holding portion side relative to the radial center of the connecting member.

16. The air supply device according to claim 6, characterized in that: The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction, The rib included in the connection member disposed on the virtual straight line is provided between an end portion of the connection member on the stator holding portion side and an end portion of the connection member on the bearing holding portion side.

17. The air supply device according to claim 6, characterized in that: The plurality of connecting members each have a rib protruding from an end surface on the impeller side of the end surface in the axial direction, When the connecting member is viewed from the side, the rib included in the connecting member disposed on the virtual straight line is recessed relative to a line connecting both ends of the end surface of the rib on the impeller side.

18. The air supply device according to claim 1, characterized in that: The above stator has: The back of the core is cylindrical; a plurality of teeth extending radially inward from the core back and arranged at equal intervals in the circumferential direction; and a coil wound around the teeth, When the second housing is viewed in plan, the connecting portion overlaps with the teeth and the coil.

19. The air supply device according to claim 1, characterized in that: A flow path forming member is further provided, the flow path forming member surrounds the impeller and the radially outer side of the first housing, has an air intake port at one end portion in the axial direction, and has an air discharge port at the other end portion, The above stator has: a cylindrical core back; and A plurality of teeth extending radially inward from the core back and arranged at equal intervals in the circumferential direction, The second housing includes a plurality of the connecting portions arranged in the circumferential direction at intervals from each other. As the impeller rotates, an airflow is formed that flows in from the air intake port and is discharged from the air discharge port, and an airflow is formed that flows in from the gap between the connecting parts and flows out from the gap between the stator and the first housing through the gap between the teeth.

20. A vacuum cleaner, characterized in that: A fan device according to any one of claims 1 to 19 is provided.

Images