CN101608630A - Electric blower and electric vacuum cleaner equipped with the same - Google Patents

Abstract

The invention relates to an electric blower and an electric vacuum cleaner. Reduce the ventilation resistance when the air flows inside the motor to improve efficiency, and effectively cool the brushes of the motor to increase the life. The electric blower has: a motor (2) that is open at one end and has a rotor (6) and a stator (8) inside; at least a pair of brushes (10) that move in contact with the rotor; a housing that accommodates the motor and the brushes (3); the rotating shaft (5) located on the rotor; the centrifugal fan (12) installed on the rotating shaft; the diffuser (14) guiding the wind discharged from the centrifugal fan to the air duct in the casing; and covering The fan cover (13) installed on the casing in the form of a centrifugal fan and a diffuser is formed with a protruding portion (3a) protruding to the outer peripheral side on the opening side of the casing, and an opening for discharging wind is formed on the protruding portion ( 21), among the air passages formed by the outer circumference of the stator and the inner diameter of the casing, no opening is provided on the air passage where the brushes are located.

Description

Electric blower and electric vacuum cleaner equipped with the same

technical field

The present invention relates to an electric blower and an electric vacuum cleaner provided with the electric blower.

Background technique

As a conventional electric blower for an electric vacuum cleaner, a bracket for accommodating bearings is attached to the opening side of a case that is open at one end, and a diffuser is arranged between a centrifugal fan mounted on a rotor shaft protruding from the bracket and the bracket. In addition, a fan cover is attached to the outer peripheral portion of the bracket to cover the diffuser and the fan.

The motor stator of the commutator motor is fixed on the housing, and an exhaust port is provided on the side of the housing opposite to the fan. Also, a plurality of openings through which a part of the air flow from the centrifugal fan is exhausted are provided on the bracket on which the fan cover is mounted, and cut and raised portions are provided to guide the air flow along the outer surface of the housing. As a result, the commutator motor is cooled by the airflow flowing in the casing and the airflow flowing outside (for example, refer to Patent Document 1).

Moreover, in a conventional electric blower, a bracket for accommodating bearings is mounted on the opening side of a housing that is open at one end, and a plurality of openings are provided on the bracket, and the total area of the openings is defined as the exhaust port on the opposite side of the fan. 70% to 80% of the total area, make the outer peripheral edge of the opening roughly coincide with the outer peripheral end of the return flow guide, and discharge the airflow from the centrifugal fan from both the opening and the exhaust port (for example, refer to Patent Document 2).

In addition, in the conventional electric blower, a bracket for accommodating the bearing is installed on the opening side of the housing that is open at one end, and an opening is provided on the bracket, so that the airflow discharged from the opening and the brush holder of the commutator motor Collision (for example, refer to Patent Document 3).

Patent Document 1: Japanese Patent Application Laid-Open No. 3-105099

Patent Document 2: Japanese Patent Application Laid-Open No. 20-26099

Patent Document 3: Japanese Patent Laid-Open No. 2005-201157

According to the prior art as described in the patent document, a part of the air flow from the diffuser can be discharged without passing through the inside of the case housing the commutator motor, so the loss can be reduced and the efficiency of the blower can be improved.

In terms of the air flow flowing in the casing containing the commutator motor and flowing out from the exhaust port on the opposite side of the centrifugal fan, it cools the brushes of the commutator motor, especially the commutator that is in contact with the high temperature Strong, but in Patent Documents 1 and 2, there is no concern about brush cooling. Because there are many openings on the bracket, the air volume used to cool the inside of the motor is reduced. Since there are also openings on the flow path where the brushes are located, the cooling of the brushes becomes insufficient and the life of the motor is shortened. short danger.

In addition, in the technology described in Patent Document 3, the brush holder is indirectly cooled by causing the air flow from the opening to collide with the brush holder, but since an air layer exists between the brush holder and the brush, the cooling of the brush itself is not sufficient. full.

Moreover, since the noise generated from the centrifugal fan is directly released from the cover to the outside by providing the opening, there is a problem of increasing the noise of the electric blower and the electric vacuum cleaner equipped with the electric blower.

Contents of the invention

The object of the present invention is to solve the above-mentioned conventional problems, realize a longer life of the motor, and improve the efficiency of the blower.

In addition, the object of the present invention is to improve the life of the motor and the efficiency of the blower while reducing the noise generated from the centrifugal fan.

Furthermore, an object of the present invention is to provide an electric vacuum cleaner in which suction power is increased by using the electric blower.

In order to achieve the above object, the present invention is characterized in that it has: a motor having a rotor and a stator; at least a pair of brushes that move in contact with the rotor; and a housing that is open at one end and accommodates the motor and the brushes inside. ; a rotating shaft provided on the above-mentioned rotor; a centrifugal fan installed on the rotating shaft; a diffuser that guides the air discharged from the above-mentioned centrifugal fan to the air duct in the above-mentioned housing; A fan cover with a suction port in the center is installed on the above-mentioned case, and a protruding portion protruding outward is formed on the opening side of the above-mentioned case, and an opening for discharging wind is formed on the protruding portion. The air duct formed by the outer circumference and the inner diameter of the housing and the air duct where the brushes are located are not provided with the opening.

Furthermore, in order to achieve the above object, the present invention is characterized in that it has: a motor having a rotor and a stator; at least a pair of brushes sliding with the rotor; ; a rotating shaft provided on the above-mentioned rotor; a centrifugal fan installed on the rotating shaft; a diffuser that guides the air discharged from the above-mentioned centrifugal fan to the air duct in the above-mentioned housing; A fan cover with a suction port in the center installed on the above-mentioned casing, the diffuser includes an annular body provided on the fan cover side, a diffuser wing body with a plurality of wings on the end bracket side, and a The other side of the baffle on which the plurality of wings are arranged has the baffle and a return flow guide of the plurality of return wings, a through hole is provided on the rear edge side of the diffuser wing, and a The protruding portion that protrudes toward the outer peripheral side forms an opening for discharging wind on the protruding portion, and the opening is not provided in the air passage formed by the outer circumference of the stator and the inner diameter of the housing and where the brush is located.

In addition, in order to achieve the above object, the present invention is characterized in that the electric vacuum cleaner includes: a vacuum cleaner main body for accommodating the dust collection chamber and an electric blower; a hose connected to the main body of the vacuum cleaner at one end; part; an extension tube with one end connected to the other end of the handle operating part; and a suction body connected to the other end of the extension tube, the electric blower has: a motor with a rotor and a stator; at least a pair of electric motors sliding with the rotor A brush portion; a casing with one end open and housing the above-mentioned motor and the above-mentioned brush portion inside; a rotating shaft provided on the above-mentioned rotor; a centrifugal fan installed on the rotating shaft; the wind discharged from the above-mentioned centrifugal fan is directed into the above-mentioned casing a diffuser guided by an air duct; and a fan cover having a suction port in the center mounted on the housing in such a manner as to cover the centrifugal fan and the diffuser,

The diffuser includes an annular body provided on the side of the fan case, a diffuser wing body having a plurality of wings on the end bracket side, and a spacer and a spacer on the other side of the spacer on which the wings are arranged. The backflow deflector of the plurality of backflow deflector wings is formed with a protruding portion protruding to the outer peripheral side on the opening side of the above-mentioned housing, and an opening for discharging wind is formed on the protruding portion. The above-mentioned opening is not provided within the specified range from the front side of the

The present invention has the following effects.

According to the present invention, the brushes can be effectively cooled, the life of the motor can be extended, and the reliability can be improved.

Furthermore, according to the present invention, the life of the motor and the efficiency of the blower can be improved while reducing the noise generated from the centrifugal fan.

Description of drawings

Fig. 1 is an external perspective view of an electric vacuum cleaner according to an embodiment of the present invention.

Fig. 2 is a vertical sectional view of a vacuum cleaner body according to an embodiment of the present invention.

Fig. 3 is a half longitudinal sectional view of an electric blower according to an embodiment of the present invention.

FIG. 4 is a top view of the motor of the bracket of FIG. 3 , partially cut away.

Fig. 5 is the section A-A of Fig. 3 .

Fig. 6 is a top view of the diffuser.

Fig. 7 is a schematic diagram of a static flow path portion of the blower.

Fig. 8 is a plan view of a motor of an electric blower according to an embodiment of the present invention.

Fig. 9 is a plan view of a motor of an electric blower according to an embodiment of the present invention.

Fig. 10 is a half longitudinal sectional view of an electric blower according to an embodiment of the present invention.

Fig. 11 is a perspective view of a diffuser.

In the picture:

1-Blower, 2-Motor, 3-Case, 3a-Protruding part, 3b-Installation part, 3c-Exhaust port, 4-Bracket, 5-Rotation shaft, 6-Motor rotor, 7-Stator coil, 8 -Motor stator, 8a-Long side of motor stator outer circumference, 8b-Short side of motor stator outer circumference, 9-Bearing, 10-Brush part, 10a-Brush holder, 11-Converter, 12-Centrifugal fan, 13- Fan cover, 13a, 304-suction inlet, 14-diffuser, 14a-diffuser wing, 15-return deflector, 15a-return deflector wing, 16-nut, 17-annular body, 18-baffle, 19 -Sealing member, 20a, 20b-flow path, 21-opening, 22-reinforcement, 23-through hole, 201-vacuum cleaner body, 202-hose, 203-handle operation part, 204-extension tube, 205-suction port Body, 206-opening operation part, 301-lower shell, 302-upper shell, 303-dust cover, 305-dust bag, 306-dust chamber, 307-electric blower room, 308-electric blower, 309-auxiliary Filter, 310 - Vent.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Example 1

An electric vacuum cleaner according to an embodiment of the present invention will be described using FIG. 1 and FIG. 2 .

FIG. 1 shows a perspective view of the appearance of an electric vacuum cleaner according to an embodiment of the present invention. 201 is the main body of the vacuum cleaner containing the dust collection chamber for collecting dust and the electric blower 308 (Fig. 2) for generating the suction airflow needed for dust collection; 202 is the hose connected to the main body 201 of the vacuum cleaner at one end; The handle operation part connected to the other end, 204 is an extension pipe whose one end is connected to the other end of the handle operation part 203 , and 205 is a suction body connected to the other end of the extension pipe 204 . 206 is a switch operation part for turning on and off the electric blower 308 provided on the handle operation part 203 .

In the above structure, when the switch operation part 206 of the handle operation part 203 is operated, the electric blower 308 accommodated in the cleaner main body 201 operates, and suction airflow is generated. Then, the dust is sucked in from the nozzle body 205 and collected in the dust collection chamber of the cleaner main body 201 through the extension pipe 204 , the handle operation part 203 , and the hose 202 .

Next, the vacuum cleaner main body 201 is demonstrated using the longitudinal cross-sectional side view of the vacuum cleaner main body 201 in the electric vacuum cleaner shown in FIG.

The vacuum cleaner main body 201 is composed of a lower shell 301 , an upper shell 302 and a dust collecting cover 303 to form an outer contour. A suction port 304 is formed in the dust collecting cover 303, and a dust collecting chamber 306 for accommodating the dust bag 305 joined to the suction port 304 is formed inside it. Behind the dust collection chamber 306 , an electric blower chamber 307 follows, and accommodates an electric blower 308 . The suction side of the electric blower 308 communicates with the dust collection chamber 306 through the auxiliary filter 309 . The exhaust side of electric blower 308 is opened to the outside from exhaust port 310 through an exhaust chamber and an exhaust filter. In addition, the dust collection chamber 306 can also be used as a cyclone for dust collection.

Next, the electric blower 308 will be described with reference to FIGS. 3 to 7 . Fig. 3 is the semi-longitudinal sectional view of the embodiment of electric blower of the present invention, and Fig. 4 shows the top view of the electric motor that bracket 4 is partially cut away, Fig. 5 shows the A-A section of Fig. 3, Fig. 6 is the top view of diffuser 14, Fig. 7 is a schematic diagram of the static flow path portion of the blower 1 such as the diffuser 14 and the return guide 15 . The electric blower 308 is roughly divided into a blower 1 and a motor 2 .

The motor 2 includes: a motor case composed of a cylindrical case 3 with one end open and a bracket 4 arranged on the opening side of the case 3; ) and a motor stator 8 (stator) wound with a stator coil 7 . The supply of electricity to the motor rotor 6 is transmitted by the brush portion 10 and the converter 11 in contact therewith.

The motor stator 8 of the electric motor 2 has a substantially octagonal shape as viewed from the front, four long sides 8 a and four short sides 8 b are alternately arranged, and the four short sides 8 b are fixed to the case 3 . Inside the motor stator 8, a pair of stator coils 7 are wound oppositely. Four fan-shaped flow passages 20 a , 20 b are formed by the outer peripheries of the four long sides 8 a of the motor stator 8 and the inner diameter of the casing 3 . The brush unit 10 is arranged on the downstream side of the flow path 20b on the side where the stator coil 7 is not included. The brush unit 10 is fixed to the housing 3 with screws by a brush holder 10a. On the upstream side of the flow path 20b where the brushes are arranged, a bracket 4 is fixed with screws, and a bearing 9 is held on the bracket 4 to support the rotating shaft 5 .

The blower 1 includes a centrifugal fan 12 , a fan case 13 for accommodating the centrifugal fan 12 , a diffuser 14 , and a static flow path portion having a return guide 15 on the back of the diffuser 14 .

The blower 1 includes: a centrifugal fan 12 having a plurality of blades fixed by nuts 16 at the end of the rotating shaft 5; a diffuser 14 having a plurality of diffuser wings 14a arranged on the outer peripheral side of the centrifugal fan 12; The annular body 17 on the upper side (fan cover 13) side of the device wing 14a; the partition plate 18 provided on the lower side (bracket 4) side of the diffuser 14; A backflow guide 15 with a plurality of backflow guide wings 15a; and a fan cover 13 with a built-in centrifugal fan 12, a diffuser 14 and a backflow guide 15, an air suction port 13a in the center, and a connection with the housing 3. A sealing member 19 is arranged on the fan cover 13, and is substantially in contact with the centrifugal fan 12, and has a leak-proof structure. In this embodiment, the diffuser 14 with a plurality of diffuser wings 14a, the baffle 18 and the return flow deflector 15 with a plurality of return flow deflector wings 15a form fixed guide vanes, and the wind discharged from the centrifugal fan 12 is directed toward the casing. The air duct in the body 3 is guided. In addition, an annular body 17 may be provided to form a fixed guide vane as needed.

As shown in FIG. 6, the rear edge of the diffuser blade 14a of the diffuser 14 is located in the vicinity of the fan cover, and an approximately incised groove is formed from the outer peripheral end of the diffuser blade 14a along the surface on the outer peripheral side of the diffuser blade 14a. The triangular window 14b (notch portion) is the flow path of the triangular concave portion.

The opening edge portion of one end of the housing 3 fitted with the fan cover 13 has a protruding portion 3a bent and protruding outward, and the outer peripheral end portion of the protruding portion 3a is bent toward the opening side of the housing 3 to form a substantially cylindrical shape. Shaped mounting part 3b. The fan cover 13 is press-fitted to the mounting portion 3 b of the housing 3 and fixed to the housing 3 .

An opening 21 through which wind is discharged without passing through the inside of the motor 2 is formed in the protruding portion 3 a of the housing 3 . The opening 21 is open in the axial direction of the rotating shaft 5 as shown in FIGS. 4 and 5 , and the opening 21 is not provided on the protrusion 3 a upstream of the flow path 20 b where the brush unit 10 is located.

When the motor 2 is driven by the electric blower 308 configured as described above, the air flowing in from the suction port 13 a of the fan cover 13 is boosted and accelerated by the centrifugal fan 12 . The airflow discharged from the centrifugal fan 12 is decelerated between the blades of the diffuser blade 14a, and the kinetic energy is converted into pressure energy to increase the pressure. The airflow discharged from the diffuser 14 is turned approximately 90° by the triangular window 14b as shown by the arrows in FIGS. 6 and 7 . Then, it is divided into two airflows, and a part of them is discharged from the opening 21 of the casing 3 and discharged to the outside of the casing 3 . Furthermore, a further part of the partial flow is deflected by approximately 90° here and flows into the return flow guide 15 . The airflow passing through the backflow deflector 15 flows into the casing 3, cooling the motor rotor 6, stator coil 7, motor stator 8, brush portion 10 and converter 11 in the casing 3, and from the exhaust port of the casing 3 3c is discharged to the outside.

As shown in Fig. 4 and Fig. 5, since no opening 21 is provided on the protrusion 3a of the case 3 on the upstream side of the flow path 20b where the brush part 10 is located, much of the airflow flowing out from the diffuser 14 flows to Among the fan-shaped four flow paths 20a and 20b, there exists in the flow path 20b of the brush unit 10 . Furthermore, since the opening 21 exists in the flow path 20a without the brush portion 10, the amount of air discharged to the outside of the case 3 is large and the flow in the flow path 20a is small.

The life of the motor 2 is related to the temperature of the brush unit 10 in contact with the converter 11 , and the life of the motor 2 can be extended by cooling the brush unit 10 . According to the present embodiment, since the brush unit 10 can be effectively cooled, the life of the brush unit 10 , that is, the life of the motor 2 can be extended. In addition, since the flow rate of cooling air is small in the flow path 20a where the cooling intervention to the brush unit 10 is small, the flow velocity in the flow path 20a is low, and the loss can be reduced, and the efficiency of the blower can be improved.

That is, the efficiency of the electric blower 308 can be improved, the life of the motor 2 can be prolonged, and the electric blower 308 with high reliability can be obtained.

Therefore, by mounting the electric blower 308 on the cleaner main body 201, the reliability of the electric vacuum cleaner is improved, and the suction power can be increased.

As described above, in the present embodiment, among the four fan-shaped flow paths 20a, 20b formed by the motor stator 8 of the motor 2 and the casing 3, the casing on the upstream side of the flow path of the brush unit 10 is arranged. 3 does not form an opening for discharging wind without passing through the motor, so most of the airflow flowing out from the diffuser 14 flows into the flow passage where the brush part 10 is located among the four fan-shaped flow passages 20a, 20b. 10 has less flow in the runner. Thereby, the brush unit 10 can be effectively cooled, the life of the motor 2 can be extended, and the reliability can be improved. In addition, since the amount of air flow is small in the flow path where the cooling intervention of the brush unit 10 is small, the flow velocity in the flow path is slowed down to reduce loss, and the efficiency of the blower can be improved.

Example 2

Next, another embodiment of the present invention will be described using FIG. 8 . Fig. 8 is the section A-A of Fig. 3 . The same reference numerals are used for the same components as those of the above-described embodiment, and descriptions thereof are omitted.

In the above-mentioned embodiment, on the protruding part 3a of the housing 3, the opening part 21 for discharging the wind without passing through the inside of the motor 2 is not provided on the protruding part 3a on the upstream side of the flow path 20b where the brush part 10 is located. And as shown in FIG. 8, on the protruding portion 3a on the upstream side of the flow passage 20b where the brush portion 10 is located, the front side of the air flow of the wind in the part where the brush portion 10 is blocked is blocked, and from the position of the brush portion 10 An opening 21 is formed on the rear side of the body.

The flow of the airflow flowing out from the diffuser 14 swirls, so even if the front side of the airflow of the wind in the part where the brush part 10 is located is blocked, and the opening part 21 is arranged toward the rear side from the position of the brush part 10, it can maintain The cooling effect of the brush part 10 can discharge the cooling air in the flow passage with little cooling intervention to the outside of the casing 3, and can further improve the efficiency of the blower. Thereby, the life extension of the motor 2 of the electric blower 308 can be achieved, and efficiency can be further improved.

The backflow deflector 15 is composed of a plurality of backflow deflector wings 15a, and an air passage is formed between adjacent backflow deflector wings 15a. The wind flowing through the air passage flows from the outer peripheral side of the casing 5 to the inner peripheral side. Then, the wind flows toward the four fan-shaped flow paths 20a and 20b, and part of the wind toward the flow path 20a is discharged to the outside of the housing 3 through the opening 21 formed in the middle of the flow path 20a. Most of the wind directed toward the flow path 20b is guided to the flow paths 20a and 20b. In this embodiment, among the plurality of air passages formed between the adjacent return flow deflector wings 15a, no opening is formed on the protruding portion 3a where the air passage toward the flow passage 20a of the cooling brush portion 10 is located. Section 21. According to this configuration, the cooling of the brushes can be performed while improving the efficiency of the blower.

In Examples 1 and 2, the opening 21 is formed in a range of approximately 1/4 or more of the circumferential direction of the casing 3 . A method of increasing the strength of the housing 3 will be described using FIG. 9 . Fig. 9 is the section A-A of Fig. 3 . The same reference numerals are used for the same components as those of the above-described embodiment, and descriptions thereof are omitted. Since the backflow deflector vane 15 a positioned below the diffuser 14 is provided across the opening 21 , a part of the opening 21 is blocked by the backflow deflector vane 15 a.

In this embodiment, an unopened portion (reinforcing portion 22 ) having a width equal to the width of the backflow deflector blade 15 a is provided toward the center of rotation at one point of the opening 21 where the backflow deflector blade 15 a is located. Since there is an unopened portion of the opening 21 blocked by the return guide vane 15a, the cooling performance is not affected, the strength of the housing 3 can be enhanced, and a more reliable electric blower 308 can be obtained.

Example 3

Next, another embodiment of the present invention will be described using FIG. 10 . FIG. 10 is a semi-longitudinal sectional view of the electric blower of this embodiment, and FIG. 11 is a perspective view of the diffuser 14 (annular body 17 is not shown). The same reference numerals are used for the same components as those of the above-described embodiment, and descriptions thereof are omitted.

The diffuser 14 is provided with a through-hole 32 on the entire rear edge side of the diffuser blade 14a. By providing through-holes in the diffuser wing 14a, the area of the convex side 24 of the diffuser wing 14a with a widening boundary layer is interconnected with the area of the concave side 25 of the diffuser wing 14a where the boundary layer is thin and the main flow flows close to it. Since the pressure on the convex side 24 is higher than that of the concave side 25 , a leakage airflow is generated from the convex side 24 to the concave side 25 , sucks out the boundary layer of the convex side 24 , and is ejected to the main flow side of the concave side 25 . As a result, the main flow that has flowed toward the concave side 25 so far flows to the central portion of the flow path. Moreover, since the convex side 24 of the diffuser wing 14a opens the triangular window 14b wider, the airflow flowing out from the diffuser 14 easily flows to the triangular window 14b to realize a smooth curved airflow, and is easily discharged from the opening 21 of the housing 3 . Therefore, blower efficiency can be improved more than the case where the diffuser blade 14a does not have the through hole 23 .

In addition, since the opening 21 is provided in the case 3, the noise generated from the centrifugal fan 12 is directly released from the fan cover 13 to the outside, so the noise of the electric blower 308 and the electric vacuum cleaner equipped with this electric blower increases. However, the through-holes 23 provided on the diffuser wings 14a make the sound waves passing between the diffuser wings 14a interfere and weaken on both sides of the diffuser wings 14a through the through-holes 23, so the noise of the electric blower itself is reduced. Therefore, the noise can be reduced even if the opening 21 exists in the case 3, and the noise reduction and the efficiency improvement can be compatible.

Therefore, by mounting this electric blower 308, noise reduction of the electric vacuum cleaner can be achieved.

The industrial applicability of this invention is as follows.

As described above, the electric blower and the electric vacuum cleaner provided with the electric blower according to the present invention can improve the reliability and efficiency of the electric blower. Thus, improved reliability and improved suction power of the electric vacuum cleaner are achieved. Furthermore, it can be widely used in applications such as household electrical equipment and industrial equipment using electric blowers.

Claims (5)

1. an electric blower is characterized in that,

Have: motor with rotor and stator; At least one pair of the brush portion that contacts with above-mentioned rotor and move; One end opening also holds above-mentioned motor and the housing of above-mentioned brush portion in inside; Be located at above-mentioned epitrochanterian running shaft; Be installed in the centrifugal cutter on this running shaft; Will be from the diffuser of the air channel guiding in the above-mentioned housing of wind direction of above-mentioned centrifugal cutter discharge; And be installed in the mode that covers above-mentioned centrifugal cutter and above-mentioned diffuser and have the fan guard of suction port at central part on the above-mentioned housing,

Opening side at above-mentioned housing is formed with to the side-prominent protuberance of periphery, forms the opening portion of discharging wind at this protuberance,

On the air channel at air channel that forms by said stator periphery and above-mentioned housing internal diameter and above-mentioned brush place, above-mentioned opening portion is not set.

2. an electric blower is characterized in that,

Have: motor with rotor and stator; At least one pair of the brush portion that contacts with above-mentioned rotor and move; One end opening also holds above-mentioned motor and the housing of above-mentioned brush portion in inside; Be located at above-mentioned epitrochanterian running shaft; Be installed in the centrifugal cutter on this running shaft; Will be from the diffuser of the air channel guiding in the above-mentioned housing of wind direction of above-mentioned centrifugal cutter discharge; And be installed in the mode that covers above-mentioned centrifugal cutter and above-mentioned diffuser and have the fan guard of suction port at central part on the above-mentioned housing,

Opening side at above-mentioned housing is formed with to the side-prominent protuberance of periphery, forms the opening portion of discharging wind at this protuberance,

To the position at brush place above-mentioned opening portion is not set in the air channel that forms by said stator periphery and housing internal diameter and from the front side of the air-flow of the wind of the part at above-mentioned brush place.

3. electric blower according to claim 1 and 2 is characterized in that,

The backflow guider is set below above-mentioned diffuser, and this backflow guider possesses the backflow guider wing that forms the air channel,

On the position, at least one place of the above-mentioned opening portion at this backflow guider wing place, be provided with the not part of opening.

4. an electric blower is characterized in that,

Have: motor with rotor and stator; At least one pair of the brush portion that contacts with above-mentioned rotor and move; One end opening also holds above-mentioned motor and the housing of above-mentioned brush portion in inside; Be located at above-mentioned epitrochanterian running shaft; Be installed in the centrifugal cutter on this running shaft; Will be from the diffuser of the air channel guiding in the above-mentioned housing of wind direction of above-mentioned centrifugal cutter discharge; And be installed in the mode that covers above-mentioned centrifugal cutter and above-mentioned diffuser and have the fan guard of suction port at central part on the above-mentioned housing,

Above-mentioned diffuser comprises the ring bodies that is located at the said fan cover side, has the diffuser wing body of a plurality of wings and the backflow guider that has this dividing plate and a plurality of backflow wings at the opposite side of the dividing plate that disposes above-mentioned a plurality of wings in the end breaket side, rear edge side at the above-mentioned diffuser wing is provided with through hole

Opening side at above-mentioned housing is formed with to the side-prominent protuberance of periphery, forms the opening portion of discharging wind at this protuberance,

Above-mentioned opening portion is not provided with opening portion on the air channel at air channel that is formed by said stator periphery and above-mentioned housing internal diameter and above-mentioned brush place.

5. an electric dust collector possesses: the main body of dust collector that holds dust precipitation chamber and electric blower; The flexible pipe that one end is connected with this main body of dust collector; The handle operation portion that one end is connected with the other end of this flexible pipe; The prolongation pipe that one end is connected with the other end of this handle operation portion; And the suction inlet body that is connected with the other end of this prolongation pipe, it is characterized in that,

Above-mentioned electric blower has: the motor with rotor and stator; At least one pair of the brush portion that contacts with above-mentioned rotor and move; One end opening also holds above-mentioned motor and the housing of above-mentioned brush portion in inside; Be located at above-mentioned epitrochanterian running shaft; Be installed in the centrifugal cutter on this running shaft; Will be from the diffuser of the air channel guiding in the above-mentioned housing of wind direction of above-mentioned centrifugal cutter discharge; And be installed in the mode that covers above-mentioned centrifugal cutter and above-mentioned diffuser and have the fan guard of suction port at central part on the above-mentioned housing,

Above-mentioned diffuser comprises the ring bodies that is located at the said fan cover side, has the diffuser wing body of a plurality of wings and have the backflow guider of this dividing plate and a plurality of backflow guider wings at the opposite side of the dividing plate that disposes above-mentioned a plurality of wings in the end breaket side,

Opening side at above-mentioned housing is formed with to the side-prominent protuberance of periphery, forms the opening portion of discharging wind at this protuberance,

In the scope of regulation, above-mentioned opening portion is not set from the front side of the air-flow of the wind of the part at above-mentioned brush place.

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