JPH06159293A - Motor-driven blower device - Google Patents

Abstract

PURPOSE:To provide a motor-driven blower device which issues low wind cutting sound and in which water contained in blower air prevented from reaching a motor part. CONSTITUTION:In a motor-driven blower FM for a vacuum cleaner of a wet and dry type, a fan cover 43 is supported to a fan cover attaching wall 4 which overhangs 1 surrounding around a stator 15. An internal passage partitioning member 45 is located between a centrifugal type blower fan 41 attached to one end of the rotor shaft 22 of a rotor 21 and covered with the cover 43, and a wall 4, the member having an annular partition wall 47 facing the surface of the wall 4 on the fan 41 side. The wall 4 is formed therein with a cooling discharge part through which air from a cooling fan 37 attached to the other end of the shaft 22 passes, inside of the partition wall 4, and a blow air discharge part 49 through which air discharged from a blower fan 41 passes, is formed outside of the partition wall 47. An external air passage partition member 71 for separating cooling air and blown air discharged from the both discharge parts is provided being superposed with a passage partition wall 55 outside of the motor blower FM.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower used in, for example, a wet and dry type vacuum cleaner.

[0002]

2. Description of the Related Art An electric blower for a wet-and-dry type vacuum cleaner is provided with a centrifugal blower fan for sucking and blowing air containing water at one end of a rotor shaft and the other end of the rotor shaft. A cooling fan that sends air for cooling the stator and the rotor is attached to the section. This type of electric blower is known from Japanese Utility Model Publication No. 59-1644 and Japanese Patent Publication No. 57-122835.

As disclosed in these publications, conventionally, a large number of exhaust holes are formed at intervals in the circumferential direction on a cover peripheral wall of a fan cover which covers a blower fan, and these exhaust holes are provided with these exhaust holes. The air discharged from the blower fan is discharged to the outside of the peripheral wall of the cover so that the stator and the rotor are not exposed to the air containing water.

[0004]

By the way, since the outlet of the blower fan and the cover peripheral wall of the fan cover are closely opposed to each other, the air discharged from the blower fan is discharged through the cover peripheral wall as described above. The conventional configuration has a problem that a large wind noise is generated because the very high-speed wind, which has a strong momentum immediately after being discharged from the blower fan, directly passes through the exhaust hole.

Further, in the electric blower, an annular support rubber is fitted to an outer surface of a corner portion formed by a portion where the cover peripheral wall and the cover end wall of the fan cover are continuous, and is supported through this rubber. Has become. Therefore, in the conventional configuration in which there is one blower fan and the exhaust holes are formed in the cover peripheral wall of the fan cover, the depth of fitting of the support rubber to the corners is adjusted so that the support rubber does not block the exhaust holes. It needs to be shallow.

Therefore, the mounting state of the support rubber becomes unstable, and the support rubber is liable to drop when the electric blower is assembled in the cleaner body of the electric vacuum cleaner, which is inconvenient for assembly. Therefore, conventionally, the blower fans are provided in multiple stages to increase the axial dimension of the fan cover, thereby ensuring a large fitting depth of the support rubber with respect to the corner portion and blocking the exhaust hole with this rubber. Are forced to avoid. Therefore, the conventional electric blower of this kind also has a problem that the axial dimension is long.

The object of the present invention is to reduce the wind noise caused by the air blowing operation, to shorten the axial dimension, to reduce the temperature rise, and to prevent the water contained in the air blowing from adversely affecting the electric motor section. It is to obtain an electric blower that can prevent giving.

[0008]

In order to achieve the above object, an electric blower according to claim 1 of the present invention has a centrifugal blower at one end of a rotor shaft of a rotor arranged inside a stator. A fan is attached, a cooling fan for cooling the stator and the rotor is attached to the other end of the rotor shaft, and a fan cover attachment wall is provided on the blower fan side to surround the stator and project outward. An electric blower in which a fan cover for covering the blower fan is attached to the attachment wall, and an internal air duct partition having an annular partition wall that abuts a surface of the fan cover attachment wall on the blower fan side, It is arranged between a fan cover mounting wall and the blower fan, and the air blown by the cooling fan is discharged to the fan cover mounting wall in the axial direction of the rotor shaft. A cooling exhaust unit is provided inside the annular partition, and a blower exhaust unit that exhausts the air discharged from the blower fan in the axial direction of the rotor shaft is provided outside the annular partition. An outer air passage partitioning body connected to an air passage partition provided outside the electric blower is abutted on a surface of the mounting wall on the cooling fan side with the fan cover mounting wall sandwiched between the outer partition and the annular partition. It was provided by.

Further, according to a second aspect of the present invention, in order to reduce the wind noise caused by the air blowing operation, the external air passage partition is abutted against the surface of the fan cover mounting wall on the cooling fan side. A peripheral wall, an outer peripheral wall that surrounds the peripheral portion of the fan cover, and a bottom wall that faces the outer peripheral portion of the fan cover attachment wall with respect to the outer peripheral side of the blower / exhaust portion and connects the peripheral walls to each other are preferable.

Further, according to a third aspect of the present invention, in order to further reduce the wind noise caused by the blowing operation, the external air duct partition body is brought into contact with the surface of the fan cover mounting wall on the cooling fan side. A peripheral wall, an outer peripheral wall that surrounds the peripheral portion of the fan cover, and a bottom wall that connects the peripheral walls facing the outer peripheral side portion of the fan cover mounting wall from the blower exhaust portion, At least one of the mutually opposing surfaces of the external air passage partition wall, the fan cover mounting wall, and the fan cover may be provided with a baffle protrusion that is formed between the opposing surfaces and protrudes into the outflow air passage.

[0011]

According to the first aspect of the present invention, the blower exhaust portion is provided not on the peripheral wall of the fan cover but on the fan cover mounting wall that surrounds the stator and projects outward. The long distance can be secured. Then, the fan cover receives the air discharged in the centrifugal direction from the discharge port on the inner surface of the cover peripheral wall, and changes the direction of the wind toward the blower / exhaust part, and the blower / exhaust part is changed in direction by the fan cover. The air is exhausted in the axial direction of the rotor. Therefore, high-speed, high-speed wind does not directly pass through the blower / exhaust unit, and the wind force can be killed and passed through the blower / exhaust unit.

Further, since the blower / exhaust section is provided on the fan cover mounting wall, the blower / exhaust section is not blocked by the support rubber fitted to the outside of the fan cover.

Further, the cooling exhaust portion provided on the fan cover mounting wall cools the stator portion formed by the rotation of the cooling fan and allows the cooling air flowing around the blower fan side portion of the stator winding to pass through the rotor. It is discharged in the axial direction. Moreover, the internal air passage partitioning body prevents the air blown by the rotation of the air blower fan and the cooling air blown by the rotation of the cooling fan from being mixed in the fan cover and disturbing each other's flow. Are guided in the axial direction of the rotor shaft toward the corresponding exhaust portions.

The external air duct partition and the air duct partition are arranged so that the cooling air discharged from the cooling exhaust unit and the air discharged from the air exhaust unit do not join outside the electric blower. Partition the wind.

According to the second aspect of the present invention, in the partitioning action of the wind, the air blown out from the air blower exhaust portion is redirected so as to make a U-turn, and the force of the air blow is further weakened.

According to another aspect of the present invention, in the baffle protrusion, the flow of the air blown through the outlet air passage formed between the fan cover mounting wall and the mutually facing surfaces of the fan cover and the external air passage partition at the position where the baffle protrusion is projected. To squeeze and obstruct the air flow, to contract the blower air in the outflow air passage and then to expand the air flow, and increase the air passage length in the outflow air passage.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will now be described with reference to FIGS.
An example will be described. Reference numeral 1 in FIGS. 1, 4, and 10
The electric motor frame shown by is integrally made of metal, and one end (upper end in FIG. 1) of the cylindrical wall 2 as the first electric motor frame is integrally provided with an end wall 3 for closing the end, and the other end of the cylindrical wall 2 ( The lower end (in FIG. 1) is opened, and the fan cover mounting wall 4 is provided so as to integrally project outward from the edge of this opening.
As shown in FIGS. 1 and 4, a bearing mounting portion 5 is integrally formed in the central portion of the end wall 3, and the end wall 3 is located around the mounting portion 5 and has a plurality of cooling members. The through hole 6 is opened.

As shown in FIG. 1, the opening of the cylindrical wall 2 is formed so that its diameter gradually increases toward the fan cover mounting wall 4 side and is continuous with the fan cover mounting wall 4. The fan cover mounting wall 4 is formed by bending an overhanging peripheral portion 4b around the peripheral edge of the overhanging plate portion 4a and bending an overhanging edge portion 4c at the tip of this peripheral portion 4b. The projecting plate portion 4 a is projected outward so as to be orthogonal to the cylindrical wall 2. The overhanging peripheral portion 4b extends substantially parallel to the cylindrical wall 2 in the direction of the end wall 3, and the overhanging edge portion 4c is provided in parallel with the overhanging plate portion 4a.

As shown in FIG. 3, a sheet metal frame end face plate 7 as a second electric motor frame is horizontally mounted on the projecting plate portion 4a. The end face plate 7 has a shape that traverses the opening of the cylindrical wall 2 in the radial direction, and forms an electric motor frame body together with the electric motor frame 1. The frame end face plate 7 is positioned by inserting the bending claws 7a at both ends in the length direction into a plurality of long holes 8 (see FIGS. 2 to 4) provided in the projecting plate portion 4a, and at the same time, these long holes are formed. 8 is attached to the fan cover mounting wall 4 by screwing screws 10 (see FIG. 3) passing through both ends of the frame end face plate 7 in the length direction into a plurality of screw holes 9 provided in the vicinity of There is.

A bearing mounting portion 11 is integrally formed at the longitudinal center of the frame end face plate 7. It should be noted that 7b in FIG. 3 may be omitted in the present invention, but it is a hole provided for weight reduction in the present embodiment. Further, the frame end face plate 7 is inclined so as to gradually separate from the opening of the cylindrical wall 2 as it goes from both ends to the bearing mounting portion 11, but this inclination is not necessary in the present invention. Further, 12 in FIG. 4 is a screw hole provided in the projecting plate portion 4a, and 13 in FIG. 4 is also a screw hole.

A stator 15 is built in the electric motor frame 1. Therefore, the stator 15 is surrounded by the fan cover mounting wall 4. The stator 15 includes a pair of salient poles 16a (see FIG. 8) of a stator core 16 made of silicon steel plates laminated as shown in FIGS. 1 and 3 with an insulating slot (not shown) interposed between the stator windings. 17 are attached respectively.

The stator core 16 has a substantially quadrangular outer diameter shape when viewed from the end face direction, and its four corner outer surfaces are curved surfaces along the inner peripheral surface of the cylindrical wall 2. The stator 15 has its four corner outer surfaces brought into contact with the inner peripheral surface of the cylindrical wall 2, and is press-fitted into the cylindrical wall 2 from its opening side to be housed and fixed.

A pair of closing plates 18 are sandwiched between an end surface of the stator core 16 located on the opening side of the cylindrical wall 2 and the pair of stator windings 17, respectively. These closure plates 1
8 are combined with each other to form a circular outer circumference, and the outer circumference is in contact with the inner peripheral surface of the cylindrical wall 2. As a result, the pair of closing plates 18 close the gap G between the flat outer surface between the corners of the stator core 16 and the inner peripheral surface of the cylindrical wall 2 from the opening side of the cylindrical wall 2.

The construction of the closure plate 18 is shown in FIGS. That is, in the closing plate main portion 61 having the substantially arcuate peripheral end surface 61a along the inner peripheral surface of the cylindrical wall 2, the cooling fan side portion 17a of the stator winding 17 and the rotor 21 described later.
Is formed with a recess 62 for passing through. The first and second parts are provided on both side portions of the closing plate main portion 61 that sandwich the recess 62.
The engaging protrusions 63 and 64 are separately provided integrally with each other, and a slanted tongue 65 is integrally provided on the first engaging protrusion 63 side. The first engaging projection 63 is the closing plate main portion 61.
The second engaging protrusion 64 is formed on the other surface side of the closing plate main portion 61 to be slightly raised to form a step. Rectangular engaging holes 66 are formed in the engaging protrusions 63 and 64, respectively. Further, slanting first and second hooking pieces 67 and 68 are respectively cut and raised in opposite directions on the both side portions of the closing plate main portion 61.

In the closing plate 18 having this structure, the first and second engaging projections 63, 6 are arranged so that the closing plate main portion 61 overlaps the outside of the stator 15 and the end surface of the stator core 16 on the blower fan side.
4 by inserting the stator core 16
And the cooling fan side portion 17a of the stator winding 17 are sandwiched and attached. Moreover, in this insertion, the pair of closing plates 18 are attached so that the center of the rotor 21 is arranged in point symmetry.

As a result, as shown in FIG. 8, the engaging hole 66 of the first engaging projection 63 of the one closing plate 18 and the second engaging piece 68 of the other closing plate 18 are engaged. With
Hooking hole 66 of the second engaging projection 64 of the one closing plate 18
And the first hooking piece 67 of the other closing plate 18 are engaged with each other, and the slanted tongue pieces 65 of both closing plates 18 overlap one surface of the corresponding closing plate main portion 61, so that both closing plates 18 are Connected to each other.

As shown in FIG. 1, a rotatable rotor 21 passing through the stator 15 is arranged inside the stator 15. Both ends of the rotor shaft 22 of the rotor 21 are separately supported by bearings 23 and 24 respectively incorporated in the bearing mounting portions 5 and 11, and these bearings 23 and 2 are also supported.
Penetrates 4 As shown in FIG. 1, a cooling passage 25 is formed between the outer peripheral surface of the rotor 21 and the inner peripheral surface of the stator core 16 which are opposed to each other. The closing plate 18 does not close the cooling passage 25.

A commutator 26 is attached to the rotor shaft 22. Brush devices 27 are attached to the cylindrical wall 2 at two locations corresponding to the radial direction, respectively, penetrating the cylindrical wall 2.
A brush (not shown) included in these devices 27 is a commutator 26.
The commutator pieces are pressed against the outer peripheral surfaces arranged in the circumferential direction. In addition, a motor frame body composed of the motor frame 1 and the frame end face plate 7, a stator 1
5, the closing plate 18, the rotor 21, the commutator 26, and the brush device 27 constitute an electric motor section of the electric blower.

As shown in FIG. 1, an electric motor holder 31 made of synthetic resin is attached to the end wall 3 side of the electric motor frame 1. The holder 31 has a relief portion for the brush device 27 and the like and is fitted to the outer periphery of the cylindrical wall 2, a cylindrical wall cover portion 32, a cylindrical holder portion 33 having a smaller diameter than the cover portion 32, and these. It is formed of a step portion 34 that connects the portions integrally and contacts the outer surface of the peripheral portion of the end wall 3.

The holder portion 33 has mounting protrusions at two places (not shown) inside thereof, and these are provided on the screw receiving protrusions 3a (see FIG. 4) projectingly formed at two places on the end wall 3. I have come into contact with them. Then, these screw receiving projections 3a
Corresponding to the concave portion 33a provided on the outer surface of the holder portion 33
The electric motor holder 31 is fixed to the electric motor frame 1 by screwing these screws 35 into the screw holes 36 (see FIG. 4) of the screw receiving projection 3a from the mounting screws 35 (see FIG. 2).

One end portion (upper end portion in FIG. 1) of the rotor shaft 22 penetrating the bearing mounting portion 5 and the bearing 23 is located at the inner center of the cylindrical holder portion 33, and an axial flow is applied to this one end portion. Shaped cooling fan 37 is fixed. In addition,
38 is a nut for fixing the fan. This cooling fan 3
The periphery of 7 is surrounded by the inner peripheral surface of the cylindrical holder portion 33, and the blowing air of the cooling fan 37 is guided by the inner surface of the electric motor holder 31 and guided to the cooling through hole 6.

One sheet metal blower fan 41 is attached via a nut 42 to the other end portion (lower end portion in FIG. 1) penetrating the bearing mounting portion 11 and the bearing 24 of the rotor shaft 22. The blower fan 41 has a suction port 4 at the center.
1a and a discharge port 41b at the peripheral portion thereof, and discharges the air sucked from the suction port 41a.
It is a centrifugal type which discharges from b in the centrifugal direction.

As shown in FIG. 1, the blower fan 41 is covered with a sheet metal fan cover 43. The fan cover 43 is formed by integrally connecting a cover end wall 43b to a lower end of a cover peripheral wall 43a having a cylindrical shape in FIG. 1, and providing an intake port 44 in a central portion of the wall 43b so as to closely face the intake port 41a. ing. This fan cover 43
Is attached to the fan cover mounting wall 4 by fitting the upper end opening (in FIG. 1) of the cover peripheral wall 43a to the projecting edge 4c of the fan cover mounting wall 4. By this attachment, the inner surface of the cover peripheral wall 43a and the blower fan 4
The first discharge port 41b is opposed to the first discharge port 41b.

Inside the fan cover 43, between the blower fan 41 and the fan cover mounting wall 4, an internal air duct section 4 made of synthetic resin for covering the opening of the motor frame 1 is provided.
5 are arranged. This partition 45 is provided by the blower fan 4
The base wall 46 has a diameter larger than 1, and faces the fan 41, and is formed of a disk-shaped base wall 46 and an annular partition wall 47 that is integrally projected from the peripheral portion of the base wall 46.

In FIG. 1, reference numeral 46a denotes a straightening vane integrally projecting from the peripheral portion of the base wall 46 toward the cover end wall 43b and contacting the inner surface of the cover end wall 43b. These straightening vanes 46a are the cover end wall 43b. When viewed from the side, they form an arc shape and form rectifying air passages 46b between them, and a large number of them are provided so as to surround the blower fan 41. The rectifying air passage 46b is formed so as to gradually increase the air passage cross-sectional area from the inlet on the side of the outlet 41b toward the outlet on the side of the cover peripheral wall 43a, and the wind of the air discharged from the blower fan 41 is formed. A long path is secured to guide the wind while rectifying it. In the present invention, the flow straightening vanes 46a forming the flow straightening air passages 46b may be omitted.

The central portion of the base wall 46 is the frame end plate 7
Is fitted to the outside of the bearing mounting portion 11. The base wall 46 is attached to the frame end face plate 7 by the bearing mounting portion 11 thereof.
Is fixed to the frame end face plate 7 with a screw 48 (see a two-dot chain line in FIG. 3) screwed into a screw hole 7c (see FIG. 3) provided in the vicinity of the frame end face plate 7.

The annular partition wall 47 projects in the axial direction of the rotor 21, and its outer peripheral surface faces the inner surface of the cover peripheral wall 43a of the fan cover 43. The front end surface of the annular partition wall 47 has a protruding plate portion 4 a of the fan cover mounting wall 4.
Is in contact with the surface of the blower fan 41 side. It should be noted that the partition wall 47 is provided at its tip end with a recess (not shown) that fits into the longitudinal end portions 7d of the frame end face plate 7.

As shown in FIG. 9, the mating surface between the annular partition wall 47 and the projecting plate portion 4a is sealed with a sealing agent 60 made of a silicone adhesive or the like. The sealing agent 60 is provided by fixing the internal air duct dividing body 45 with a screw 48 in a state of being pre-applied to the tip of the annular partition wall 47. As the sealant, instead of the silicone adhesive, a rubber packing sandwiched between the tip surface of the annular partition wall 47 and the projecting plate portion 4a may be used.

By sealing the mating surfaces in this manner, it is possible to close a slight gap that may be formed due to component accuracy between the protruding tip of the annular partition wall 47 and the projecting plate portion 4a. Therefore, it is possible to reliably separate the cooling air passage and the air passage for blowing air having a higher wind pressure. Therefore, it is possible to prevent the moisture contained in the blown air from entering the cooling air passage, and the cooling air passing through the cooling air passage is not disturbed by the high-pressure air blowing through the air blowing passage, and the flow of the cooling air is prevented. Can be ensured smoothly and a decrease in motor efficiency can be prevented.

Overhanging plate portion 4 of the fan cover mounting wall 4
As shown in FIGS. 1 to 4, a is provided with a plurality of first exhaust holes 49 as a blower exhaust part, and is provided with a plurality of second exhaust holes 50 as a cooling air exhaust part. Each first exhaust hole 49 is formed in a portion located outside the annular partition wall 47 with respect to the overhanging plate portion 4a, and each second exhaust hole 50 is formed with respect to the overhanging plate portion 4a in the annular partition wall 4a.
It is formed in the part located inside 7.

The passage area of the first exhaust hole 49 is equal to that of the second exhaust hole 5.
It is larger than the passage area formed by 0. As shown in FIG. 3, the first exhaust holes 49 and the second exhaust holes 50 are provided on both sides in the width direction of the frame end face plate 7 corresponding to the blower fan side portions 17a of the pair of stator windings 17, respectively. Has been.

In the electric blower FM having the above-mentioned structure, the external air passage partition 71 is attached to the projecting plate portion 4a of the fan cover attachment wall 4. The partition 71 constitutes an electric blower together with the electric blower FM and an air passage partition wall described later, and is formed of a synthetic resin in a short cylindrical shape as shown in FIGS. 1 and 2.

The external air duct partition 71 is projected by screwing a screw 72 passing through a mounting portion 71a formed at one end thereof into a screw hole 13 (see FIG. 4) provided in the protruding plate portion 4a. The plate portion 4a is attached to the surface of the plate portion 4a on the cooling fan 37 side by abutting one end having the attachment portion 71a. The external air duct partition 71 thus mounted is projected from the opening of the fan cover 43 on the cooling fan 37 side.

Moreover, the external air duct partition 71 has the same diameter as the annular partition wall 47 and is provided on the extension line of the partition wall 47 with the projecting plate portion 4a sandwiched between the annular partition wall 47. Therefore, the first exhaust part 49 is located outside the external air duct partition 71, and the second exhaust part 50 is located inside. The sealing agent 60 is also provided between the external air duct partition 71 and the projecting plate portion 4a in order to close a slight gap that may be formed therebetween, whereby the cooling air duct is provided. The cooling air passing through is prevented from being disturbed by the high-pressure air flowing through the air passage, the flow of the cooling air is ensured smoothly, and the efficiency of the motor is prevented from lowering.

The electric blower FM having the above-described structure is provided in the main body case of a wet and dry type electric vacuum cleaner as shown in FIG.
As shown in 0, the cooling fan 37 is built in so that the blower fan 41 is located at the top and the blower fan 41 is located at the bottom. The cooling fan 37 side of the electric blower FM has an annular support rubber 51 fitted to the outside of the holder portion 33 of the electric motor holder 31.
While being supported by the ribs 52 of the main body case via the, the blower fan 41 side of the electric blower FM is fitted to the outside of the corner formed by the cover peripheral wall 43a of the fan cover 43 and the fan cover end wall 43b. Annular support rubber 53
Is supported by the ribs 54a and 54b of the main body case.

Further, reference numeral 55 in FIG. 10 denotes an air duct partition of the main body case, which is in contact with the end of the external air duct partition 71 on the cooling fan 37 side via an annular support rubber 56. A first exhaust passage 57 for blowing air is formed between the air passage partition wall 55 and the rib 54a, and the exhaust air passage 57 prevents the air containing water from flowing to the brush device 27 side. A second exhaust passage 58 for cooling air is formed between the passage partition wall 55 and the rib 52.

When the electric blower FM having the above structure is operated, the cooling fan 37 and the blower fan 41 are rotated together with the rotor 21. Therefore, due to the rotation of the cooling fan 37, the wind sent in the axial direction of the cooling fan 37 will not be discharged.
Through the cooling through hole 6 and flows into the electric motor frame 1 so as to be blown to the cooling fan side portion 17b of the stator winding 17.

This wind is concentrated in the cooling passage 25 between the stator 15 and the rotor 21 due to the structure in which the closing plate 18 for closing the gap G between the stator 15 and the motor frame 1 is attached to the stator 15. Stator 15 and rotor 21
To cool.

The wind that has passed through the cooling passage 25 is guided to the inner surface of the internal air passage partition body 45, passes through the second exhaust holes 50 formed in the projecting plate portion 4a of the fan cover mounting wall 5, and passes through the motor frame 1 It is discharged outside. Moreover, in the guide of the cooling air in the internal air passage partition body 45, the cooling passage 25 is located between the pair of stator windings 17, and
The exhaust hole 50 is the portion 17 of the stator winding 17 on the blower fan side.
Since the cooling air passing through the cooling passage 25 is provided at the outer position so as to be sandwiched between the cooling passage 25 and the cooling passage 25, the internal air passage partition body 45 is arranged so as to be along the blower fan side portion 17a.
The second exhaust hole 50 is reached while being guided by. The flow of the cooling air caused as described above is shown by a dotted arrow in FIG.

Therefore, this cooling air can reduce the temperature rise of the electric motor section. That is, as described above, the cooling air is not only concentratedly passed through the cooling passage 25 after the cooling air is blown on the blower fan side portion 17b of the stator winding 17, but also the blower fan side portion 17a of the stator winding 17 is supplied. Since cooling air can be made to flow along the stator 1,
5 and the rotor 21 can be effectively air-cooled to reduce the temperature rise of the electric motor section.

The cooling air discharged to the outside of the electric motor frame 1 through the second exhaust holes 50 passes between the outer peripheral surface of the cylindrical wall 2 of the electric motor frame 1 and the inner peripheral surface of the external air duct partition 71. It is guided to the second exhaust air passage 58 through which the air is appropriately exhausted to the outside of the main body case.

On the other hand, the rotation of the blower fan 41 forms the flow of blown air shown by the solid line in FIG. That is, the air sucked into the blower fan 41 through the intake port 44 of the fan cover 43 and the suction port 41a of the blower fan 41 is discharged from the discharge port 41b of the fan 41 in the centrifugal direction. The discharged high-speed wind hits the inner surface of the cover peripheral wall 43a of the fan cover 43 after passing through the rectifying air passage, changes its direction toward the fan cover mounting wall 4 side, and flows, while the base portion 46 of the internal air passage partitioning body 45. Is guided along the outer peripheral surface of the annular partition wall 47, bypassing the peripheral portion of
It is discharged to the outside of the motor frame 1 along the axial direction of the rotor 21 through the first exhaust hole 49 formed in the projecting plate portion 4a of the fan cover mounting wall 4.

In this blowing operation, the internal air duct division body 4
Reference numeral 5 divides the air passage so that the cooling air and the blown air do not mix in the fan cover 43, and guides the respective winds toward the corresponding exhaust holes 49, 50 in the axial direction of the rotor 21. It is possible to prevent a smooth flow of the cooling air from being impaired and impair the air-cooling action of the electric motor unit, and also to prevent disturbance of the air blow, thereby maintaining a good air blowing action.

The blown air discharged to the outside of the electric motor frame 1 through the first exhaust hole 49 is formed between the inner peripheral surface of the projecting peripheral portion 4b of the fan cover mounting wall 4 and the outer peripheral surface of the external air duct partition 71. It is guided to the first exhaust air passage 57 through the space and is appropriately exhausted from the air passage 57 to the outside of the main body case.

As described above, since the cooling air and the blown air discharged from the exhaust holes 49 and 50 are separately guided by the external air passage partition 71 and the air passage partition wall 55, these winds are mixed. And the first and second exhaust air passages 5
Since the cooling air and the blast are separately guided and exhausted by 7, 58, even if the air sucked into the blast fan 41 contains water, the electric blower FM may be exposed to the water from the outside. Absent. Further, in the air blowing operation, the air blown by the rotation of the air blower fan 41 has a higher pressure than the cooling air, but the internal air passage partitioning body 45 prevents the air blown from being sent into the electric motor section of the electric blower FM. It can be prevented. Therefore, even if the air sucked by the blower fan 41 contains water, the inside of the electric motor unit is not exposed to this water. Since the water contained in the blown air does not act on the inside and outside of the electric motor unit in this manner, it is possible to prevent adverse effects of water such as rusting the iron-based parts of the electric motor unit.

Further, according to the blowing operation, the air is not directly passed through the cover peripheral wall 43a of the fan cover 43, and the direction is changed without being exhausted. Since the distance of the air blowing path to the exhaust hole 49 is long, the momentum of a very high-speed wind that is good immediately after being discharged from the discharge port 41b of the blower fan 41 is killed, and the first exhaust hole 49 causes the rotor 21 to move. Can be discharged in the axial direction.

Therefore, the wind noise generated when the wind passes through the first exhaust holes 49 can be reduced. Therefore, it is not necessary to bend the edge of the first exhaust hole 49 to reduce wind noise. If a quieter operation is required, it is effective to bend the edge of the first exhaust hole 49 to reduce wind noise. Moreover, since the projecting plate portion 4a provided with the first exhaust holes 49 is not a curved surface but a flat surface, it is possible to easily perform the boring process of the first exhaust holes 49 provided therein.

As described above, since the wind formed by the blower fan 41 is discharged from the fan cover mounting wall 4 in the axial direction of the rotor 21, the support rubber 53 fitted on the outer side of the fan cover 43 has the first exhaust hole 49. Does not block Therefore, a deep fitting depth H (see FIG. 10) of the support rubber 53 with respect to the fan cover 43 is secured, and the rubber 53 is secured.
The mounting state of can be stabilized.

Therefore, when the electric blower FM is installed in the main body case of the electric vacuum cleaner, the support rubber 53 does not drop accidentally, and the assembling work can be facilitated. Nonetheless, it is not necessary to provide blower fans in multiple stages to lengthen the fan cover in order to increase the fitting depth of the support rubber 53, and since only one blower fan 41 is required, the shaft of the electric blower FM is not required. The direction length can be shortened.

Further, according to the flow of air formed by the blower fan 41, there is no need for a space around the fan cover 43 for the air to flow. Therefore, the substantial installation space of the electric blower FM can be reduced, other parts around the blower FM can be arranged close to each other, or the main body case of the electric vacuum cleaner can be miniaturized along the radial direction of the electric blower FM. It is advantageous when trying to

11 to 14 show a second embodiment of the present invention. In the description of this embodiment, the same components as those in the first embodiment will be designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted. Only the components different from the first embodiment will be described below. To do.

The second embodiment is different from the first embodiment in the structure of the external air passage partitioning body 75 mounted on the fan cover mounting wall 4, and the other structures are the same as those in the first embodiment, including a portion not shown. The configuration is the same as that of the embodiment.

That is, as shown in FIG. 13 and FIG. 14, the outer air duct partition 75 made of synthetic resin has an inner peripheral wall 76.
And an outer peripheral wall 77 parallel to the wall 76 and the both walls 7
It is formed in a ring shape from a bottom wall 78 in which 6, 7 are integrally connected. The inner peripheral wall 76 has the same diameter as the annular partition wall 47 of the internal air duct dividing body 45, and the outer peripheral wall 7
7 is formed with a diameter larger than the outer diameter of the fan cover 43.

The external air duct partition 75 is attached to the projecting plate portion 4a through screws 79 which are screwed into four screw holes 13 (see FIG. 4) formed in the projecting plate portion 4a of the fan cover mounting wall 4. In the annular recess that is fixed and formed by each of the walls 76 to 78, a portion of the overhanging plate portion 4a located outside the annular partition wall 47 and the fan cover 43.
The opening side portion of the cooling fan 37 side is housed.

More specifically, the inner peripheral wall 76 is located on the extension line of the air passage partition wall 47 by sandwiching the projecting plate portion 4a between it and the annular partition wall 47 and contacting the surface of this plate portion 4a on the cooling fan 37 side. Has been done. The outer peripheral wall 77 is located so as to surround the opening side portion of the peripheral wall 43a of the fan cover 43 on the cooling fan 37 side, and the tip end of the outer peripheral wall 77 is in contact with the air duct partition 55 via the rubber packing 56. The bottom wall 78 is located so as to face the outer peripheral side of the first exhaust hole 49 of the fan cover mounting wall 4.

In the second embodiment, the air-blowing gap A between the outer peripheral surface of the base wall 46 of the internal air duct dividing body 45 and the cover peripheral wall 43a of the fan cover 43, and the internal air duct dividing body 4 are provided.
5, the air-blowing gap B between the annular peripheral wall 47 and the cover peripheral wall 43a, the diameter C of the first exhaust hole 49 as the air-blowing gap, the inner peripheral wall 76 of the external air passage partitioning body 75, and the fan cover mounting wall 4
Of the fan cover 43 and the bottom wall 78 of the external air duct partition body 75, the cover peripheral wall 43a of the fan cover 43 and the external air duct partition. The ventilation gap F between the body 75 and the outer peripheral wall 77 is defined as E <A <F <C <D <B.
As a result, the air blowing gaps A to E communicating with the first exhaust air passage 57.
The blast path consists of a passage that repeats narrowing and then expanding.

In the structure of the second embodiment, the intended purpose of the present invention can be achieved by the same operation as that of the first embodiment, and in addition, the structure of the external air passage partitioning body 75 allows the first exhaust gas to be exhausted. The air blown from the holes 49 is guided by the bottom wall 78 and the outer peripheral wall 77 of the external air duct partitioning body 75 to the first exhaust air duct 57 while making a U-turn, so that the force of the air blow is further weakened. Wind noise due to movement can be further reduced. Moreover, because of the configuration of the air blowing gaps A to F as described above, the air blown from the air blowing fan 41 to the first exhaust air passage 57 repeats expansion and contraction many times,
Due to the sound deadening effect, the wind noise can be further reduced.

FIG. 16 shows a third embodiment of the present invention. In the description of this embodiment, the same components as those in the first embodiment will be designated by the same reference numerals as those in the first embodiment, and the description thereof will be omitted. Only the components different from the first embodiment will be described below. To do. The third embodiment differs from the first embodiment in the configuration of a first exhaust hole (blast exhaust part) 49 and a second exhaust hole (cooling air exhaust part) 50 formed in the fan cover mounting wall 4. The other configurations are the same as the configurations of the first embodiment including parts not shown.

That is, as shown in FIG. 16, the overhanging portion 4a of the fan cover mounting wall 4 is provided with a hole divided into two by the annular partition 47 of the internal air duct partitioning body 45, and the annular partition of this hole is provided. The hole portion located outside 47 is used as the first exhaust hole 49, and the hole portion located inside the annular partition 47 is used as the second cooling exhaust portion 50.

In the structure of the third embodiment, in addition to achieving the intended object of the present invention by the same operation as in the first embodiment, the first exhaust port is divided into two by the annular partition wall. Since the holes used as the exhaust holes 49 and the second exhaust holes 50 are provided, the number of holes to be processed on the projecting portion 4a of the fan cover mounting wall 4 is reduced as compared with the first embodiment, and there is an advantage that the holes can be easily processed. is there.

17 to 19 show a fourth embodiment of the present invention. In the description of this embodiment, the same components as those in the second embodiment will be designated by the same reference numerals as those in the second embodiment, and the description thereof will be omitted. Only the components different from the second embodiment will be described below. To do. The fourth embodiment is different from the second embodiment in the configuration of the external air duct dividing body 75, and the other configurations are the same as the configurations in the second embodiment including parts not shown.

That is, the bottom wall 78 of the external air duct partitioning body 75.
A baffle projection 81 is integrally provided on the inner surface of the. The protrusion 81 is annular and protrudes into the outflow air passage 82 formed between the surfaces of the outer air passage partitioning body 75 and the fan cover mounting wall 4 and the fan cover 43 that face each other. For example, it is located close to the projecting edge 4c of the fan cover mounting wall 4, and a part of the outflow air passage 82 is narrower than other outflow air passage portions.

In the construction of the fourth embodiment, in addition to the fact that the intended purpose of the present invention can be achieved by the same operation as that of the second embodiment, the baffle projection 81 is provided, so that the outflow air passage is provided. The air discharged in 82 can be expanded after being throttled. Therefore, the dimensional relationship between each of the ventilation gaps A, B, D, E and the diameter C of the first exhaust hole 49 as the ventilation gap (E <A <F <C <D <B).
In addition to this, since the number of times that the blowing air repeats expansion and contraction can be secured more, the noise reduction effect can further reduce the wind noise.

In the fourth embodiment, a plurality of baffle projections 81 may be provided, and the positions where they are provided are not limited to the inner surface of the external air duct partitioning body 75, but the fan cover mounting wall facing the inner surface. 4 and fan cover 4
3 and at least one of them may be provided, and by providing a plurality of them in this way, a further greater silencing effect can be obtained.

FIG. 20 shows a fifth embodiment of the present invention. In the description of this embodiment, the same components as those in the second embodiment will be designated by the same reference numerals as those in the second embodiment, and the description thereof will be omitted. Only the components different from the second embodiment will be described below. To do. The fifth embodiment is different from the second embodiment in that the sound deadening material 91 is housed inside the external air passage partitioning body 75, and other configurations include the configuration of the second embodiment including parts not shown. Is the same as.

That is, the sound deadening material 91 is made of glass wool and hardened to an appropriate thickness to form a ring shape having a diameter larger than that of the fan cover 43, which is supported by the stepped portion 75 a provided in the external air duct partition 75. Has been done. And the external air duct partition 7
5 is screwed to the fan cover mounting wall 4 to close the opening of the fan cover 43.

Since the muffler 91 is provided in the external air duct partition 75, the air blown through the first exhaust holes 49 passes through the muffler 91 once and is directed by the bottom wall 78 of the external air duct partition 75. After being converted, it passes through the sound deadening material 91 again, passes between the cover peripheral wall 43a of the fan cover 43 and the outer peripheral wall 77 of the external air duct partitioning body 75, and flows out to the first exhaust air duct.

In this way, the sound deadening material 91 can provide a sound deadening effect to the air flow, so that the wind noise can be further reduced.

The present invention is not limited to the above embodiments. For example, one end of the stator core is connected to a first electric motor frame forming a fan cover mounting wall, and the other end of the stator core is connected to a second electric motor frame to which a brush device is attached. The present invention can also be applied to an electric blower having a configuration in which the is exposed. When the closing plate is provided in implementing this type of electric blower, the closing plate may be attached to the stator so as to close the gap between the second electric motor frame and the stator.

Further, in the present invention, the blower exhaust unit 49 is
It may be formed over the projecting plate portion 4a and the projecting peripheral portion 4b, or the projecting peripheral portion 4b and the projecting edge portion 4 may be formed.
a cutout (open end thereof is closed by the cover peripheral wall 43a of the fan cover 43), or the protruding edge portion 4
You may form by the notch provided in c. Further, the blower exhaust part 49 may be formed as an elongated hole extending in the circumferential direction of the projecting plate part 4a.

Moreover, the closing plate 18 may be omitted in the present invention. That is, since the blower fan side portion 17a of the stator winding 17 is bent outward in the radial direction so as to be away from the rotor shaft 21, and a part thereof has a relationship facing the gap G when the closing plate 18 is not provided, Along with the cooling air that passes through the cooling passage 25 and reaches the cooling exhaust portion 50, the gap G
This is because the blower fan side portion 17a can be air-cooled even with the cooling air that passes through to the cooling exhaust portion 50.

Further, in each of the above-described embodiments, the external air duct partition bodies 71 and 75 are attached to the electric blower. However, these are provided on the blower installation member such as the main body case of the vacuum cleaner, and the electric blower to this member is provided. Depending on the installation, it may be carried out such that it hits the surface of the fan mounting wall of the electric blower on the side of the cooling fan.

[0083]

As described in detail above, according to the electric blower of the present invention according to claim 1, the force of the high-speed wind discharged from the blower fan is killed to pass through the blower exhaust portion of the fan cover mounting wall. Therefore, the wind noise caused by the blowing operation can be reduced, the ventilation exhaust section is not blocked by the support rubber fitted to the outside of the fan cover, and it is not necessary to provide the blowing fans in multiple stages. The overall axial dimension can be shortened. Further, since the internal air passage compartment having the annular partition wall is provided and the fan cover mounting wall is provided with the cooling exhaust portion, the cooling air can be discharged in the axial direction of the rotor without being mixed with the air blowing, so that the air blowing and cooling can be performed. The air can be smoothly discharged and the temperature rise of the electric motor part can be reduced, and the internal air duct partition, the external air duct partition and the air duct partition partition the cooling air and the air blow inside and outside the electric blower, respectively, It is possible to prevent the electric motor unit from being exposed to the water contained in the blown air from inside and outside.

In the electric blower according to the second aspect of the present invention, the blown air discharged from the blower exhaust section is changed in direction so as to make a U-turn by the external air passage partitioning body, so that the force of blown air is further weakened. , It is possible to further reduce the wind noise caused by the blowing operation.

Further, in the electric blower of the present invention according to claim 2, a baffle projection portion which is formed in the outflow air passage formed between the external air passage partition wall and the fan cover mounting wall and the fan cover is provided. By including the blower, the blown air discharged from the blower air exhaust unit can be contracted / expanded in the outflow air passage, and thereby the wind noise caused by the blow operation can be further reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of an electric blower according to a first embodiment of the present invention, taken along line ZZ in FIG.

FIG. 2 is a diagram showing the configuration of the electric blower according to the first embodiment as viewed from the direction of arrow Y in FIG.

FIG. 3 is a diagram showing a configuration of an electric motor unit of the electric blower according to the first embodiment as viewed from a direction of an arrow X in FIG. 1.

FIG. 4 is a diagram showing a configuration of an electric motor frame of the electric blower according to the first embodiment as viewed from a direction of an arrow X in FIG. 1.

FIG. 5 is a plan view showing the configuration of the closing plate according to the first embodiment.

6 is a side view of the closing plate shown in FIG.

FIG. 7 is a cross-sectional view of the closing plate taken along line WW in FIG.

8 is a plan view showing a state in which the pair of closing plates shown in FIG. 5 are attached to a stator.

FIG. 9 is a cross-sectional view showing a joint relationship between the inner and outer air passage partitions with respect to the fan cover mounting wall according to the first embodiment.

FIG. 10 is a view showing a mounting state of the electric blower according to the first embodiment.

FIG. 11 is a cross-sectional view showing the configuration of the electric blower according to the second embodiment of the present invention, taken along line VV in FIG.

FIG. 12 shows a configuration of an electric blower according to the second embodiment.
FIG.

FIG. 13 is a plan view showing a configuration of an external air duct partitioning body according to the second embodiment.

14 is a side view showing a partial cross section of the external air duct partitioning body shown in FIG.

FIG. 15 is a view showing a mounting state of the electric blower according to the second embodiment.

FIG. 16 is a view corresponding to FIG. 3 showing the configuration of an electric motor section of an electric blower according to a third embodiment of the present invention together with an internal air duct partitioning body in section.

FIG. 17 is a cross-sectional view corresponding to FIG. 11 showing a configuration of an electric blower according to a fourth embodiment of the present invention.

FIG. 18 is a plan view showing the configuration of an external air duct partitioning body according to the fourth embodiment.

FIG. 19 is a side view showing a partial cross section of the external air duct partitioning body shown in FIG. 18;

FIG. 20 is a cross-sectional view corresponding to FIG. 11, showing the configuration of an electric blower according to a fifth embodiment of the present invention.

[Explanation of symbols]

4 ... Fan cover mounting wall, 6 ... Cooling through hole, 15 ... Stator, 18 ... Closure plate, 21 ... Rotor, 22 ... Rotor shaft, 25 ... Cooling passage, 37 ... Cooling fan, 41 ... Blower fan, 43 ... Fan Cover, 45 ... Internal air passage compartment, 4
6 ... Base part, 47 ... Annular partition wall, 49 ... First exhaust hole (blast exhaust part), 50 ... Second exhaust hole (cooling exhaust part), 55
... Air passage partition wall, 57 ... First exhaust air passage, 58 ... Second exhaust air passage, 71 ... External air passage partition, 75 ... External air passage partition, 7
6 ... inner peripheral wall, 77 ... outer peripheral wall, 78 ... bottom wall, 81 ... baffle protrusion, 82 ... outflow air passage.

Claims (3)

[Claims] 1. A centrifugal fan is attached to one end of a rotor shaft of a rotor arranged inside a stator, and a cooling fan for cooling the stator and the rotor to the other end of the rotor shaft. A fan cover mounting wall that surrounds the stator and extends outwardly is provided on the side of the blower fan, and an electric blower having a fan cover that covers the blower fan is mounted on the mounting wall. An internal air passage partition having an annular partition wall that comes into contact with the surface of the attachment wall on the side of the blower fan is arranged between the fan cover attachment wall and the blower fan, and the cooling fan is attached to the fan cover attachment wall. A cooling exhaust unit for exhausting the air blown by the fan in the axial direction of the rotor shaft is provided inside the annular partition wall, and A blower exhaust unit that discharges the discharged air in the axial direction of the rotor shaft is provided outside the annular partition wall, and an external air duct partitioning body that is connected to an air duct partition provided outside the electric blower is provided. An electric blower, characterized in that the fan cover mounting wall is sandwiched between the partition wall and the annular partition wall so as to abut against a surface of the mounting wall on the cooling fan side. 2. The inner peripheral wall of the fan cover mounting wall, the inner peripheral wall being in contact with the surface of the fan cover mounting wall on the side of the cooling fan, and the peripheral portion of the fan cover according to claim 1. An electric blower, comprising: an outer peripheral wall; and a bottom wall that faces the outer peripheral portion of the fan cover mounting wall with respect to the blower exhaust portion and connects the both peripheral walls. 3. The outlet air passage formed between the opposing surfaces of at least one of the mutually opposing surfaces of the external air passage partition wall, the fan cover mounting wall, and the fan cover according to claim 2. An electric blower characterized by having a protruding baffle protrusion.