Electric blower and vacuum cleaner equipped with same

Abstract

To stabilize fixation positions of a fan casing and a housing.SOLUTION: An electrically-driven air blower comprises a vane wheel 211 which is driven by an electric motor part 250 to rotate, a vane wheel-side housing 212 which covers an outer periphery of the electric motor part 250, and a fan casing 230 which is connected to the vane wheel-size housing 212. The vane wheel-side housing 212 comprises a first projection part 220. The fan casing 230 has an L-shaped cut part 234 cut from a side connected to the vane wheel-side housing 212 toward the vane wheel 211 to extend in a circumferential direction of the fan casing 230. After a first projection part 220 is inserted into the side of the cut part 234 connected to the vane wheel-side housing 212, the fan casing 230 is rotated in the circumferential direction to move the first projection part 220 to a circumferentially extension position of the cut part 234, and the fan casing 230 and vane wheel-side housing 212 are connected.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to an electric blower and an electric vacuum cleaner equipped with the same. [Background technology]

[0002] BACKGROUND ART Electric vacuum cleaners have a built-in electric blower that generates suction force. For example, Patent Document 1 discloses a technique for a built-in electric blower in an electric vacuum cleaner.

[0003] Patent Document 1 discloses a fan including an impeller-side housing having a first axial diffuser vane, an anti-impeller-side housing arranged downstream of the first axial diffuser vane and having a second axial diffuser vane, and a fan casing arranged upstream of the impeller-side housing and covering the impeller. The electric motor that drives the impeller is covered by the impeller-side housing and the anti-impeller-side housing.

[0004] The impeller is inserted onto the rotating shaft of the motor and fixed with screws. The fan casing is inserted into the fitting of the impeller-side housing and glued in place. The motor assembly, integrated with the fan casing, is then assembled to the tabs on the opposite side of the impeller housing and glued in place by pouring adhesive into the housing fitting. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-81860 Summary of the Invention [Problem to be solved by the invention]

[0006] A gap is formed between the inner peripheral surface of the fan casing and the outer peripheral part of the impeller, and in order to improve the suction performance of the electric blower, it is preferable to make this gap as small as possible.

[0007] In the technology described in Patent Document 1, the fan casing is inserted into a fitting portion of the housing (impeller-side housing) at a position where the outer periphery of the impeller and the fan casing abut, and an adhesive is poured into the fitting portion to bond and fix them. Therefore, depending on the degree of abutment between the outer periphery of the impeller and the fan casing or variations in dimensional accuracy, the fan casing and the housing may be bonded at an angle, causing the outer periphery of the impeller to come into contact with the inner periphery of the fan casing, and the impeller may become locked.

[0008] SUMMARY OF THE INVENTION An object of the present invention is to provide an electric blower that solves the above problems, stabilizes the fixed position of the fan casing and the housing, and suppresses imperfect rotation of the impeller, and an electric vacuum cleaner equipped with the electric blower. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides an electric blower including an electric motor section having a stator and a rotor in a motor housing, an impeller rotationally driven by the electric motor section, a housing covering the outer periphery of the electric motor section and having diffuser blades, and a fan casing connected to the housing and covering the impeller, wherein the outer periphery of the housing is provided with first protrusions protruding radially outward. a second protrusion that protrudes radially outward and is disposed at a position offset from a circumferential extension line and an axial extension line of the first protrusion; The fan casing is provided with an L-shaped notch portion that is cut out from the side connected to the housing toward the impeller side and extends in the circumferential direction of the fan casing. a circumferential fixing portion that restricts rotation of the fan casing in the circumferential direction; After inserting the first protrusion from the side of the notch that is connected to the housing, the fan casing is rotated in the circumferential direction to move the first protrusion to a position where it extends in the circumferential direction of the notch, thereby connecting the fan casing and the housing. At the same time, the second protrusion is brought into contact with the circumferential fixing portion to restrict circumferential rotation of the fan casing. It is characterized by: [Effects of the Invention]

[0010] According to the present invention, it is possible to provide an electric blower in which the fixed position of the fan casing and the housing is stabilized and imperfect rotation of the impeller is suppressed, and an electric vacuum cleaner equipped with the electric blower. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a perspective view showing a state in which an electric vacuum cleaner 100 according to an embodiment of the present invention is stored in a charging stand. [Figure 2] 1 is an exploded view of a vacuum cleaner 100 according to an embodiment of the present invention. [Figure 3] FIG. 3 is a view taken in the direction of the arrow III in FIG. 2. [Figure 4] 1 is a perspective view of the appearance of an electric vacuum cleaner 100 according to an embodiment of the present invention. [Figure 5] 1 is a cross-sectional view of an electric blower 200 according to an embodiment of the present invention, taken along the rotation axis. [Figure 6] FIG. 2 is a side view showing a partial cross section of the right half of an impeller-side housing 212 according to an embodiment of the present invention. [Figure 7] FIG. 2 is a partially cutaway perspective view of an anti-impeller housing 213 according to an embodiment of the present invention. [Figure 8] 2 is a cross-sectional view of a fan casing 230 according to an embodiment of the present invention, taken along the axial direction. FIG. [Figure 9] FIG. 1 is an exploded perspective view of an electric blower 200 according to an embodiment of the present invention. [Figure 10] FIG. 2 is an exploded perspective view of an assembly formed by assembling an impeller-side housing and an anti-impeller-side housing, an assembly formed by assembling an impeller and an electric motor, and a fan casing. [Figure 11] FIG. 10 is an exploded perspective view of an assembly formed by assembling an impeller-side housing and an anti-impeller-side housing, and an assembly formed by assembling an impeller, an electric motor, and a fan casing. [Figure 12] 1 is a perspective view of an external appearance of an electric blower 200 according to an embodiment of the present invention. [Figure 13] 13 is an enlarged perspective view of the portion XIV in FIG. 12 as viewed from the impeller-side housing 212 side. [Figure 14] FIG. 13 is an enlarged view of a portion XIV in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In principle, identical elements are designated by the same reference numerals in all drawings. Furthermore, descriptions of parts having identical functions will be omitted. Note that the configurations described below are merely examples, and it is not intended that the embodiments of the present invention be limited to the specific embodiments below.

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing a state in which an electric vacuum cleaner 100 according to an embodiment of the present invention is stored in a charging base. In Fig. 1(a), the electric vacuum cleaner 100 is stored in a stick state in the charging base.

[0014] The electric vacuum cleaner 100 can be changed into various usage states such as a handheld state or a stick state for cleaning. The charging base 70a in which the electric vacuum cleaner 100 is stored stores the electric vacuum cleaner 100 in a stick state and is composed of a base member 71, three stand members 72, and a holder member 73. The holder member 73 is configured to be attached with an output plug of an AC adapter for charging the storage battery 3 attached to the electric vacuum cleaner 100, and when the electric vacuum cleaner 100 is set on the charging base 70a, the output plug is connected to the input jack of the electric vacuum cleaner 100 so that charging can be performed.

[0015] The base member 71 has a mounting surface 71a and an extending portion 71b. The mounting surface 71a is a generally rectangular plate-shaped portion. The extending portion 71b is a generally truncated cone-shaped portion. The extending portion 71b is provided so as to be generally perpendicular to the mounting surface 71a. The central axis of the extending portion 71b is provided so as to be located approximately in the center of the mounting surface 71a in the left-right direction and at approximately 3 / 4 of the length in the front-to-back direction.

[0016] 1(b), the vacuum cleaner 100 is stored in a handheld state in the charging base. In this state, the charging base 70b stores the vacuum cleaner 100 in a handheld state, and unlike the charging base 70a, it is configured with one stand member 72, a base member 71, and a holder member 73, omitting two stand members 72. The user can also remove three stand members 72 for compact storage, or remove one member to adjust the height for easy access. The pillar of the charging base, which is made up of the stand member 72 and the holder member 73, is formed on the axis of the dust case 2, so that the vacuum cleaner 100 can be placed on the charging base and held stably when charging.

[0017] Fig. 2 is an exploded view of a vacuum cleaner 100 according to an embodiment of the present invention. As shown in Fig. 2, the vacuum cleaner 100 is configured to include a vacuum cleaner body 1, a dust case 2 (dust collecting device), a storage battery 3 (power storage device), and an airtight member 90.

[0018] The vacuum cleaner main body 1 is configured to include a main body portion 10, a motor case portion 11, and a handle portion 12.

[0019] The main body 10 is formed with a connection port 10a (suction port) to which an extension tube 300 (see FIG. 1) or a standard suction nozzle 400 (see FIG. 1) is connected. This connection port 10a is molded from the same resin as the main body 10, motor case 11, handle 12, etc. The connection port 10a has a substantially circular opening and is formed facing forward. In addition, the connection port 10a is designed to allow attachments such as a crevice / brush switching nozzle 110, extension tube 300, standard suction nozzle 400, small suction nozzle 600, and broom-type suction nozzle 700 to be connected as accessories.

[0020] The main body 10 has a dust case 2 detachably attached thereto, and is provided with an intake pipe 14 (see FIG. 3) for sending into the dust case 2 air containing dust sucked from the connection port 10a.

[0021] The motor case 11 houses the electric blower 200 (see FIG. 5) and a main body circuit board (not shown). A circular intake port 11a is formed on the front surface of the motor case 11, through which clean air is drawn after dust has been collected in the dust case 2. Also, on the front surface of the motor case 11, below the intake port 11a, a main body terminal section 17 is provided for connection to the charging stands 70a and 70b.

[0022] The handle portion 12 is provided on the rear side of the main body portion 10 and is formed in a generally arcuate shape. By forming the handle portion 12 in a generally arcuate shape, the user can grip the handle portion 12 in a position that is most convenient for use, depending on the situation.

[0023] The handle portion 12 is also provided with a locking member 13 for locking the storage battery 3. This locking member 13 is button-shaped and supported so that it can swing. An operation button 12a is provided on the top surface of the handle portion 12. The operation button 12a is composed of three buttons, for example, "strong," "standard," and "off."

[0024] Furthermore, a release button 18 is provided at the upper front end of the handle 12. The release button 18 is operated when removing an accessory such as an extension tube 300 (see FIG. 1). By pressing the release button 18, the lock between the main body 10 and the accessory is released, allowing the accessory to be removed from the main body 10.

[0025] An airtight seal member 90 is attached to the front end of the main body 10. This airtight seal member 90 has a substantially circular cylindrical body 91. This cylindrical body 91 has a brush portion 90s with soft bristles attached in bundles at its tip end. The brush portion 90s is attached at multiple locations with bristles spaced apart and is made of an elastically deformable (flexibly deformable) material such as nylon resin. By attaching this airtight seal member 90 to the connection port 10a of the vacuum cleaner main body 1, it is possible to sweep away dirt from the surface to be cleaned, and by pressing the tip of the airtight seal member 90 against the floor surface, it is possible to improve suction power. Furthermore, by forming the connection portion 91b from a hard material, the airtight seal member 90 can be attached to the main body 10 in a stable state without falling off.

[0026] In this embodiment, the brush portion 90s is formed of nylon bristles or the like, but this is not limiting. For example, the tip end may be formed in a ring shape using soft resin. That is, the cylindrical body 91 is formed by integrally molding two different members, the elastic portion 91a and the connecting portion 91b. The elastic portion 91a is made of an elastically deformable (flexibly deformable) material such as an elastomer. This allows the entire brush portion 90s of the airtight member 90 to be in close contact with the floor surface, improving suction power compared to when it is not in close contact.

[0027] The cylindrical body 91 may be substantially entirely made of the same material as the connecting portion 91b, and may have electrostatically planted short bristles in a ring shape at the tip of the cylindrical body 91. Even with such electrostatically planted bristles, it is possible to bring the tip of the airtight seal member 90 into close contact with the floor surface, as with elastomer, and the suction force can be improved.

[0028] A narrow fitting groove 10b is formed in the horizontal direction on the upper side surface of the connection port 10a of the main body 10. A protrusion (not shown) is formed at the base end of the connection part 91b, which is fitted into and locked into the fitting groove 10b.

[0029] Furthermore, a light emitting element 10c (see FIG. 2) is provided above the connection port 10a of the main body 10. The light emitting element 10c is configured to emit light forward, that is, toward the surface to be cleaned (such as a floor).

[0030] When the airtightness maintaining member 90 is attached to the vacuum cleaner body 1, the light-emitting element 10c is located above the airtightness maintaining member 90. In other words, the outer diameter of the airtightness maintaining member 90 is set so that the light-emitting element 10c is located outside the airtightness maintaining member 90.

[0031] The storage battery 3 supplies power to the electric blower 200 (see FIG. 5) and is composed of a secondary battery such as a lithium-ion battery or a nickel-metal hydride battery. The storage battery 3 has a substantially cylindrical case 3a made of synthetic resin, and can be attached to and detached from the main body 10 by sliding the case 3a in the forward and backward directions.

[0032] Terminal portions 3b connected to the main body portion 10 are provided on the upper surface of the case 3a. Slide grooves 3c slidably supported by the main body portion 10 are formed on the upper surface of the case 3a in front of the terminal portions 3b. Slide rails 3d, 3d slidably supported by the main body portion 10 are formed on the upper surface of the case 3a protruding laterally to the left and right behind the terminal portions 3b.

[0033] Furthermore, an inlet hole 3e is formed on the front surface of the case 3a on one side (left side) in the left-right direction (width direction) to introduce cooling air for cooling the storage battery 3. This inlet hole 3e is formed long and narrow in the vertical direction.

[0034] Furthermore, on the other (right side) of the left-right direction (width direction) on the front surface of the case 3a, a discharge hole 3f is formed, through which air is discharged after cooling the storage battery 3. This discharge hole 3f is formed to have a shape symmetrical to the aforementioned introduction hole 3e.

[0035] Furthermore, a lock recess 3g is formed on the rear surface of the case 3a, into which the lock member 13 is fitted to lock the case 3a to the main body 10.

[0036] 3 is a view taken in the direction of arrow III in FIG. 2. As shown in FIG. 3, dust case 2 is of a cyclone type and has the function of separating dust-laden air sucked in through inlet pipe 14 into dust and air and collecting the dust. Dust case 2 is disposed in front of motor case 11 with its axial direction aligned in the front-to-rear direction and has a substantially cylindrical storage section 2a. Storage section 2a has a storage section opening on its front surface. A substantially rectangular inlet 2b (see FIG. 2) connected to inlet pipe 14 is formed on the top surface (side surface) of dust case 2. The dust-laden air that flows into inlet 2b becomes a swirling flow, and centrifugal force acts on the dust, separating the dust and air within dust case 2. The dust-separated air is then discharged from the rear (back) of dust case 2.

[0037] A lid 2c is supported on the front of the dust case 2 via a hinge 2d so as to be rotatable relative to the storage section 2a. The lid 2c opens and closes when disposing of dust accumulated in the dust case 2. When the lid 2c is closed, the storage section opening is blocked. A lid locking mechanism 2e is provided on the top of the lid 2c to unlock the lid 2c.

[0038] An exhaust port 16 is provided at the bottom of the motor case 11. Although not shown, this exhaust port 16 has multiple slits 16a arranged in the front-to-rear direction, and the multiple slits 16a are aligned in the up-down direction. Exhaust ports 16 are provided on both the left and right sides. A cover member 16b is provided to cover either the left or right side of this exhaust port 16. The dust case 2, the motor, and the storage battery 3 are arranged in a straight line in the longitudinal direction of the vacuum cleaner body or coaxially, and the cover member 16b slides around the axis of the motor case 11 or the dust case 2 as a rotation center, allowing the cover member 16b to selectively open either the left or right exhaust port 16. The outer shell surface of the cover member 16b is formed to be substantially flush with the motor case 11.

[0039] FIG. 4 is an external perspective view of a vacuum cleaner 100 according to an embodiment of the present invention. As shown in FIG. 4, the dust case 2 of the vacuum cleaner 100 is attached below the main body 10 and in front of the motor case 11. In this case, when the dust case 2 is attached to the vacuum cleaner body 1, the lid locking mechanism 2e is positioned on the vacuum cleaner body 1 side. This is because if the lid locking mechanism 2e were located on the opposite side (outside), there is a risk that the lid locking mechanism 2e would be released during cleaning. However, by positioning the lid locking mechanism 2e on the vacuum cleaner body 1 side, this malfunction can be prevented. For example, when cleaning under a sofa or bed in stick mode, the vacuum cleaner body 1 may be brought close to being horizontal to the floor. In this case, if the lid locking mechanism 2e were located on the front side, there is a risk that the lid locking mechanism 2e would come into contact with the floor and be released. The positions of the lid locking mechanism 2e and the hinge portion 2d are not limited to this; they may be located on the left or right side of the vacuum cleaner body 1.

[0040] A maintenance brush 2s (see Figures 2 and 3) is also detachably provided in the dust case 2. This maintenance brush 2s is located in a position that is difficult to see from the outside when the dust case 2 is attached to the vacuum cleaner body 1. This makes it difficult for the maintenance brush 2s to come off during operation, and there is no need to store the maintenance brush 2s in a location separate from the vacuum cleaner 100.

[0041] Next, the configuration of electric blower 200 will be described with reference to FIGS. 5 to 14. FIG. 5 is a cross-sectional view of electric blower 200 according to an embodiment of the present invention, taken along the rotation axis direction. FIG. 6 is a side view, partially cross-sectional, of the right half of impeller-side housing 212 according to an embodiment of the present invention. FIG. 7 is a perspective view, partially cross-sectional, of anti-impeller-side housing 213 according to an embodiment of the present invention. FIG. 8 is a cross-sectional view, partially cross-sectional, of fan casing 230 according to an embodiment of the present invention, taken along the axial direction. FIG. 9 is an exploded perspective view of electric blower 200 according to an embodiment of the present invention. FIG. 10 is an exploded perspective view of an assembly formed by assembling the impeller-side housing and the anti-impeller-side housing, an assembly formed by assembling the impeller and the electric motor, and the fan casing. FIG. 11 is an exploded perspective view of an assembly formed by assembling the impeller-side housing and the anti-impeller-side housing, and an assembly formed by assembling the impeller, the electric motor, and the fan casing. FIG. 12 is an external perspective view of electric blower 200 according to an embodiment of the present invention. Fig. 13 is an enlarged perspective view of the portion XIV in Fig. 12 as viewed from the impeller-side housing 212. Fig. 14 is an enlarged view of the portion XIV in Fig. 12.

[0042] In FIG. 5, a typical air flow is shown only on the left side by a solid arrow α1 and a dotted arrow α2.

[0043] Electric blower 200 is housed in electric vacuum cleaner 100 shown in FIG. 1 with impeller 211 facing standard suction nozzle 400 at the bottom.

[0044] In the electric blower 200, an electric motor section 250 is configured radially inward of the blower section 210.

[0045] The blower section 210 includes, from upstream of the suction airflow, an impeller 211 which is a rotary blade, a first axial diffuser vane 212a on the impeller side (impeller-side diffuser vane), and a second axial diffuser vane 213a (anti-impeller-side diffuser vane). The diffuser vanes (first axial diffuser vane 212a, second axial diffuser vane 213a) are provided in housings (impeller-side housing 212, anti-impeller-side housing 213) which cover the outer periphery of the electric motor section 250. An exhaust port 214 is provided downstream of the second axial diffuser vane 213a.

[0046] The impeller 211 is rotationally driven by an electric motor unit 250, and its outer periphery is covered by a fan casing 230. The configuration of the fan casing 230 will be described later.

[0047] 6 and 9, the impeller-side housing 212 includes an inner annular portion 212b and an outer annular portion 212c disposed radially outward (on the outer periphery) of the inner annular portion 212b, and a first axial-flow diffuser vane 212a is disposed between the inner annular portion 212b and the outer annular portion 212c. The first axial-flow diffuser vane 212a is disposed at an angle with respect to the axial direction.

[0048] 7 and 9, the anti-impeller housing 213 includes an inner annular portion 213b and an outer annular portion 213c arranged radially outward (on the outer periphery) of the inner annular portion 213b, and second axial diffuser vanes 213a are arranged between the inner annular portion 213b and the outer annular portion 213c. The second axial diffuser vanes 213a are arranged such that their upstream sides are inclined with respect to the axial direction and their downstream sides are aligned with the axial direction.

[0049] As shown in FIGS. 5 and 9, the impeller-side housing 212 having the first axial flow diffuser vanes 212 a is fixed to the impeller-side motor housing 251 using screws 270 .

[0050] An anti-impeller side housing 213 having second axial flow diffuser vanes 213a arranged on the anti-impeller side (the side farther from the impeller 211) is arranged downstream of the impeller side housing 212 (on the exhaust port 214 side).

[0051] The electric motor section 250 is located radially inside the impeller side housing 212 and the anti-impeller side housing 213. The impeller side housing 212 is located so as to cover the impeller side motor housing 251, and the anti-impeller side housing 213 is located so as to cover the anti-impeller side motor housing 252. A stator and a rotor are provided inside the motor housings (impeller side motor housing 251, anti-impeller side housing 213).

[0052] As shown in FIGS. 5 and 9 , the impeller-side motor housing 251 has the same shape as the anti-impeller-side motor housing 252 and includes multiple radially extending openings 251a and 252a on its outer periphery. The anti-impeller-side motor housing 252 includes an axially extending opening 252b. The radially extending openings 251a and 252a on the outer periphery of each motor housing are arranged in a circumferential direction, with six openings. The openings 251a of the impeller-side motor housing 251 and the openings 252a of the anti-impeller-side motor housing 252 are arranged so as not to overlap with the axial direction of the stator core 253. The openings 251a and 252a of each motor housing are arranged so as to overlap with the axial ends of the coils. The radially extending openings of the motor housing are uniformly arranged in the circumferential direction, and the number of openings and the number of blades of the second axial diffuser vanes 213a have a greatest common denominator of three. That is, the same flow field can be introduced into the openings 252a at three locations in the circumferential direction, thereby reducing the temperature distribution in the circumferential direction. Note that the greatest common divisor is preferably greater than 1, and is preferably 3 or greater, or is equal to the number of openings.

[0053] The impeller-side motor housing 251 holds a bearing 280 on the impeller 211 side in the axial direction of the electric motor unit 250. The anti-impeller-side motor housing 252 holds a bearing 281 on the anti-impeller side in the axial direction of the electric motor unit 250.

[0054] The second flow path 216 passes through the radial opening 252a of the anti-impeller side motor housing 252, the interior of the motor and the opening 251a of the impeller side motor housing 251, and between the outer periphery of the impeller side motor housing 251 and the inner annular portion 212b of the impeller side housing 212.

[0055] A first flow path 215 passing through the impeller 211, the first axial diffuser vane 212a, and the second axial diffuser vane 213a is provided on the side of the electric blower 200. The first flow path 215 is a flow path through which air sucked in from the standard air intake 400 (see FIG. 1) flows.

[0056] The first flow passage 215 and the second flow passage 216 converge at the axial end 213d of the inner annular portion 213b of the anti-impeller housing 213. The axial end 213d is located approximately halfway along the axial dimension of the second axial diffuser vane 213a. By converging the first flow passage 215 and the second flow passage 216 at the axial end 213d, the main flow of the second axial diffuser vane 213a generates a flow in the second flow passage 216 due to the Venturi effect. Cooling air is drawn into the electric motor through the opening 252a and the axial opening 252b of the anti-impeller motor housing 252. This improves the cooling performance of the electric motor unit 250. However, the opening 252a of the anti-impeller motor housing 252 does not necessarily need to be machined in order to cool the interior of the electric motor.

[0057] The axial end portion 213d may be located at or beyond approximately half the axial dimension of the second axial diffuser vane 213a, and may extend to the trailing edge of the vane. In order to generate cooling air by the Venturi effect, it is desirable that the axial end portion 213d be located closer to the impeller in the axial direction than the opening 252a.

[0058] The second flow path 216 is located radially inward of the first flow path 215. An axial opening 252b and a radial opening 252a are formed in the motor housing 252 on the side opposite to the impeller. By making these openings larger, the amount of air generated by the Venturi effect can be increased, and the inside of the motor can be cooled more efficiently as the air passes through the second flow path 216.

[0059] Furthermore, since the opening 252a of the anti-impeller side motor housing 252 is located radially inward from the inner annular portion 213b of the anti-impeller side housing 213, it becomes easier to ensure the flow path area of ​​the second flow path 216, and the inside of the motor can be cooled more efficiently.

[0060] A part of the winding of the motor protrudes from the opening 252b and is electrically connected to a drive circuit (not shown). Here, the openings of the motor housings (impeller-side motor housing 251, anti-impeller-side motor housing 252) may be configured as square holes, round holes, or holes of other shapes.

[0061] In this embodiment, the impeller 211 has a metal sleeve 283 covered by a hub plate 211a made of thermoplastic resin. The impeller 211 is fixed by threading a fixing nut 284 onto a female screw formed on the end of the rotary shaft 255. The impeller 211 in this embodiment is a mixed flow impeller, but it may also be a centrifugal or axial flow impeller.

[0062] Next, a description will be given of the configuration of the electric motor section 250. As shown in Figures 5 and 9, the electric motor section 250 includes a rotor core 254 (rotor) and a stator core 253 (stator) disposed on the outer periphery thereof.

[0063] The rotor core 254 is housed in two motor housings and fixed to a rotating shaft 255 .

[0064] Coil (winding) 256 is wound around stator core 253. Coil 256 is electrically connected to a drive circuit (not shown) provided in electric blower 200. Coil 256 uses copper wire, but may also use aluminum wire or a composite wire material using a copper material around an aluminum wire covering.

[0065] The rotor core 254 is made of a rare earth bonded magnet. The rare earth bonded magnet is made by mixing a rare earth magnetic powder with an organic binder. Examples of rare earth bonded magnets that can be used include samarium iron nitrogen magnets and neodymium magnets. The rotor core 254 is either integrally molded with or fixed to the rotating shaft 255. The operating rotation speed of the electric blower 200 is 50,000 to 200,000 cycles / min.

[0066] In this embodiment, a permanent magnet is used for the rotor core 254, but the present invention is not limited to this, and a reluctance motor, which is a type of commutatorless motor, may also be used.

[0067] A bearing 280 is provided between the impeller 211 and the rotor core 254. A bearing 281 is also provided on the opposite side of the impeller 211. The rotating shaft 255 is rotatably supported by the bearing 280 arranged on one side and the bearing 281 arranged on the other side.

[0068] The impeller-side motor housing 251, which is closer to the impeller 211, supports a bearing 280, and the anti-impeller-side motor housing 252, which is farther from the impeller 211, supports a bearing 281. The motor housing is made of metal, and using an aluminum alloy as the material enables improved cooling through heat conduction and weight reduction. The motor housing may be made of resin instead of metal, and if made of resin, providing a metal support between the bearing and the motor housing can promote cooling of the bearing. The motor housing may also be made of aluminum alloy or steel.

[0069] A spacer 285 for positioning the bearings in the axial direction is installed on the rotor core 254 side of the bearings 280 and 281 (FIG. 5).

[0070] The impeller-side motor housing 251, which is closer to the impeller 211, and the anti-impeller-side motor housing 252, which is farther from the impeller 211, are identical in shape and are installed so as to sandwich the stator core 253 in the axial direction. The outer periphery of the stator core 253 overlaps the inner wall of the motor housing in the axial direction, and they are assembled by adhesive or press-fitting. The stator core 253 contacts the two motor housings and has an exposed portion 253a exposed from the motor housing at approximately the center of the stator core 253. This stator core 253 and motor housing structure allows heat generated by the stator core 253 to be cooled by thermal conduction through the impeller-side motor housing 251 and the anti-impeller-side motor housing 252, as well as forced cooling at the exposed portion 253a, enabling high heat generation density and low-loss cooling. Note that the circumferential positions of the multiple openings 251a and 252a provided around the motor housing may be the same or different. By using a motor housing with the same structure, we have achieved both low costs and improved cooling performance.

[0071] The circumferential positions of the first axial diffuser vane 212a and the second axial diffuser vane 213a will now be described. The outer periphery of the impeller-side housing 212 is provided with a first protrusion 220, a second protrusion 224, and a third protrusion 221, which protrude radially outward at three locations in the circumferential direction.

[0072] The second protrusion 224 is disposed at a position offset from the circumferential extension line and the axial extension line of the first protrusion 220. The third protrusion 221 is disposed at a position offset from the circumferential extension line of the first protrusion 220, but overlaps with the axial extension line.

[0073] Claw portions 222 are formed at three circumferential positions on the outer periphery of the anti-impeller-side housing 213 (outer annular portion 213c), which is the side farther from the impeller 211. Insertion openings 222a are formed in the claw portions 222, into which the third protrusions 221 are inserted. Furthermore, a mounting portion 223 is formed on the inside of the anti-impeller-side housing 213 (outer annular portion 213c), which extends in the circumferential direction and abuts against an end of the outer annular portion 212c of the impeller-side housing 212, and on which the impeller-side housing 212 is mounted.

[0074] The number of blades of the first axial diffuser vanes 212a, the number of claw portions 222 at the end of the anti-impeller-side housing 213, and the number of third protrusions 221 on the impeller-side housing 212 are set so that the greatest common divisor between the number of blades and the third protrusions 221 is 3. In this way, the circumferential positions of the first axial diffuser vanes 212a and the second axial diffuser vanes 213a are set to predetermined circumferential positions, thereby improving mass productivity. Note that the greatest common divisor between the number of blades and the third protrusions 221 may be any value greater than 1, but when set to the number of protrusions, the circumferential position of each diffuser vane is determined, optimizing mass productivity during assembly.

[0075] Next, we will explain the configuration of fan casing 230. Fan casing 230 has suction section 231 that draws in air as impeller 211 rotates, inclined section 232 that is formed so that the flow path expands downstream from suction section 231, and outer wall section 233 that extends axially from the end of inclined section 232.

[0076] The outer wall portion 233 has an L-shaped notch 234 formed in it, which protrudes partially toward the side connected to the impeller-side housing 212 and is cut out from the side connected to the impeller-side housing 212 toward the impeller side, and extends in the circumferential direction of the fan casing 230. The notch 234 is formed in three locations in the circumferential direction of the outer wall portion 233. The notch 234 is provided on the impeller-side housing side (lower side) with an axial fixing portion 236 extending in the circumferential direction.

[0077] Furthermore, the fan casing 230 has an abutment portion 235 extending circumferentially formed at a position radially inside (on the inner circumferential side) of the outer wall portion 233. The abutment portion 235 abuts against the impeller-side end of the outer annular portion 212c of the impeller-side housing 212 when the fan casing 230 and the impeller-side housing 212 are combined together.

[0078] Next, a method for assembling the electric blower 200 will be described.

[0079] As shown in FIG. 9, the impeller-side housing 212 is arranged so as to cover the impeller-side motor housing 251 of the electric motor, which is assembled separately, and is fixed to the impeller-side motor housing 251 using screws 270.

[0080] Next, impeller 211 is fixed to rotary shaft 255. Impeller 211 is inserted into rotary shaft 255 of the motor, and fixing nut 284 is attached to the end, and then impeller 211 is fixed to rotary shaft 255 (FIG. 10).

[0081] Next, the outer annular portion 212 c of the impeller-side housing 212 is inserted into the inner circumferential side of the outer wall portion 233 of the fan casing 230 , thereby connecting the impeller-side housing 212 and the fan casing 230 .

[0082] When connecting the impeller-side housing 212 and the fan casing 230, the notch 234 of the fan casing 230 is aligned with the first protrusion 220 formed on the outer periphery of the impeller-side housing 212, and the first protrusion 220 is inserted from the portion of the notch 234 that is cut out on the impeller-side housing 212 side. When the first protrusion 220 is inserted into the notch 234, the abutment portion 235 of the fan casing 230 abuts against the impeller-side end of the outer annular portion 212c that constitutes part of the impeller-side housing 212, thereby restricting axial movement. Thereafter, the fan casing 230 is rotated relative to the impeller-side housing 212 (to the left in FIG. 11 , in the direction of the arrow in FIG. 13 ) so that the first protrusion 220 and the axial fixing portion 236 overlap in the axial direction. Additionally, the first protrusion 220 is brought into contact with the end of the notch 234. This restricts movement of the fan casing 230 in either the axial or circumferential direction, and the fan casing 230 and the impeller-side housing 212 are connected.

[0083] Next, a means for preventing the fan casing 230 from rotating in the direction of removal will be described with reference to FIGS.

[0084] In addition to the first protrusions 220, the outer periphery of the impeller-side housing 212 is provided with second protrusions 224 at three locations in the circumferential direction.

[0085] The second protrusion 224 is provided with a first inclined portion 224a that gradually becomes higher in the rotation direction (protrudes gradually radially outward) when the fan casing 230 is rotated and fixed. In other words, the second protrusion 224 is provided with a first inclined portion 224a that is inclined so that the amount of protrusion that protrudes radially outward increases from the first protrusion 220 side toward the opposite first protrusion side in the circumferential direction.

[0086] In addition, the outer wall portion 233 (outer periphery) of the fan casing 230 is provided with a circumferential fixing portion 237 that abuts against the second protrusion portion 224 when the fan casing 230 is rotated in the circumferential direction, and restricts the circumferential rotation of the fan casing 230.

[0087] The inner peripheral surface of the circumferential fixing portion 237 is provided with a second inclined portion 237a that gradually becomes higher in the rotation direction (protrudes gradually radially inward) when the fan casing 230 is rotated and fixed. In other words, the inner peripheral surface of the circumferential fixing portion 237 is provided with the second inclined portion 237a that is inclined so that the amount of protrusion that protrudes radially inward increases as the circumferential direction moves from the side opposite the first protruding portion to the side of the first protruding portion 220.

[0088] Then, when first protrusion 220 is inserted into notch 234 of fan casing 230 and fan casing 230 is rotated in the direction of the arrow shown in Fig. 13, axial fixed portion 236 moves to a position where it overlaps with first protrusion 220 in the axial direction, and circumferential fixed portion 237 moves over first inclined portion 224a of second protrusion 224, and an end of circumferential fixed portion 237 and an end of second protrusion 224 come into contact (Fig. 14). The abutment of the end of circumferential fixed portion 237 and the end of second protrusion 224 restricts circumferential movement of fan casing 230.

[0089] Next, the electric motor assembly integrated with the fan casing 230 is fixed to the anti-impeller side housing 213. When fixing the electric motor assembly to the anti-impeller side housing 213, the third protrusion 221 of the impeller side housing 212 is aligned with the claw portion 222 of the anti-impeller side housing 213, and the third protrusion 221 is inserted into the insertion opening 222a of the claw portion 222. When the third protrusion 221 is inserted into the insertion opening 222a of the claw portion 222, the end of the outer annular portion 212c of the impeller side housing 212 comes into contact with the mounting portion 223 of the anti-impeller side housing 213, and the impeller side housing 212 and the anti-impeller side housing 213 are connected.

[0090] According to this embodiment, the first protrusion 220 of the impeller-side housing 212 is inserted into the cutout formed in the fan casing 230 to connect the fan casing 230 and the impeller-side housing 212, so that the connection between the fan casing 230 and the impeller-side housing 212 can be easily stabilized.

[0091] Furthermore, according to this embodiment, the fan casing 230 is provided with the second protrusion 224 and the circumferential fixing portion 237 that restrict circumferential rotation, thereby preventing the connection between the fan casing 230 and the impeller side housing 212 from being released.

[0092] Furthermore, according to this embodiment, an abutment portion 235 extending circumferentially is formed at a radially inner position of the outer wall portion 233 of the fan casing 230, and this abutment portion 235 is made to abut against the impeller-side end portion of the outer annular portion 212c of the impeller-side housing 212. Therefore, the positions of the impeller-side housing 212 and the fan casing 230 can be stabilized, and the impeller 211 can be prevented from locking and causing rotation problems.

[0093] The present invention is not limited to the above-described embodiments and includes various modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations. [Explanation of symbols]

[0094] 1...vacuum cleaner body, 2...dust case, 2a...storage section, 2b...inlet, 2c...lid, 2d...hinge section, 2e...lid lock mechanism, 2s...care brush, 3...storage battery, 3a...case, 3b...terminal section, 3c...slide groove, 3d...slide rail, 3e...inlet hole, 3f...discharge hole, 3g...lock recess, 10...main body section, 10a...connection port, 10b...fitting groove, 10c...light emitting element, 11...motor case section, 11a...suction port, 12...handle section, 12a...operation button, 13...lock member, 14...inlet pipe, 16...exhaust port, 16a...slit, 16b...case Bar member, 17...main body terminal portion, 18...release button, 50...operating rotation speed, 70a...charging base, 70b...charging base, 71...base member, 71a...placing surface, 71b...extension portion, 72...stand member, 73...holder member, 90...airtightness maintaining member, 90s...brush portion, 91...cylindrical body, 91a...elastic portion, 91b...connection portion, 100...electric vacuum cleaner, 110...gap / brush switching nozzle, 200...electric blower, 210...blower portion, 211...impeller, 211a...hub plate, 212...impeller side housing, 212a...first axial flow diffuser blade, 212b...inner Annular portion, 212c...outer annular portion, 213...anti-impeller housing, 213a...second axial diffuser vane, 213b...inner annular portion, 213c...outer annular portion, 213d...axial end portion, 214...exhaust port, 215...first flow path, 216...second flow path, 220...first protrusion, 221...third protrusion, 222...claw portion, 222a...insertion opening, 223...mounting portion, 224...second protrusion, 224a...first inclined portion, 230...fan casing, 231...suction portion, 232...inclined portion, 233...outer wall portion, 234...notched portion, 235...contact portion, 236...axial circumferential fixing portion, 237...circumferential fixing portion, 237a...second inclined portion, 250...motor portion, 251...impeller side motor housing, 251a...opening, 252...anti-impeller side motor housing, 252a...opening, 252b...opening, 253...stator core, 253a...exposed portion, 254...rotor core, 255...rotating shaft, 256...coil (winding), 270...screw, 280...bearing, 281...bearing, 283...sleeve, 284...fixing nut, 285...spacer, 300...extension tube, 400...standard suction nozzle, 600...small suction nozzle, 700...broom-type suction nozzle.

Claims

1. An electric blower comprising: an electric motor section having a stator and a rotor within a motor housing; an impeller rotationally driven by the electric motor section; a housing covering an outer periphery of the electric motor section and having diffuser blades; and a fan casing connected to the housing and covering the impeller, The housing is provided on its outer periphery with a first protrusion protruding radially outward and a second protrusion protruding radially outward and disposed at a position offset from a circumferential extension line and an axial extension line of the first protrusion, The fan casing is formed with an L-shaped notch portion that is cut out from the side connected to the housing toward the impeller side and extends in the circumferential direction of the fan casing, and a circumferential fixing portion that restricts rotation of the fan casing in the circumferential direction, an electric blower characterized in that after the first protrusion is inserted from the side of the notch that connects to the housing, the fan casing is rotated circumferentially to move the first protrusion to a position that extends circumferentially from the notch, thereby connecting the fan casing and the housing, and the second protrusion is abutted against the circumferential fixing portion to restrict circumferential rotation of the fan casing.

2. In claim 1, the housing includes an inner annular portion and an outer annular portion disposed on an outer peripheral side of the inner annular portion, the diffuser vanes being disposed between the inner annular portion and the outer annular portion, an inner peripheral side of the fan casing, the inner peripheral side of which is provided with a contact portion that contacts the impeller-side end of the outer annular portion;

3. In claim 1, An electric blower characterized in that the second protrusion portion is provided with a first inclined portion that is inclined so that the amount of protrusion that protrudes radially outward increases as the second protrusion portion moves from the first protrusion portion side toward the opposite side to the first protrusion portion in the circumferential direction.

4. In claim 3, an electric blower, characterized in that the inner surface of the circumferential fixing portion is provided with a second inclined portion that is inclined so that the amount of protrusion toward the radially inward direction increases as the circumferential direction moves from the side opposite the first protrusion portion toward the first protrusion portion.

5. An electric vacuum cleaner comprising a vacuum cleaner body having a dust case and an electric blower, and an attachment connected to the vacuum cleaner body, 5. An electric vacuum cleaner, wherein the electric blower is the electric blower according to any one of claims 1 to 4.

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