JPH11346964A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vacuum cleaner capable of preventing the clogging of a rotary brush body with dust, the rotary brush body having a simple structure, and stably maintaining a high suction capability. SOLUTION: This vacuum cleaner is constructed in such a manner that a pulley for receiving a rotating force is attached to the end part of a rotary brush 5 provided in the nozzle part 3 of an upright type vacuum cleaner, and the rear flow of a motor-driven blower 13 is guided to the outer peripheral surface of the rotary brush 5 by using the inside of the pulley as an air passage. Alternatively, a fan is provided inside the pulley to forcibly send the rear flow. Otherwise, a blowing fan is attached to the end part of the rotary brush 5 located in a side opposite to the pulley, and an external air taking-in port is formed in the case of the nozzle part 3 to take in external air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner provided with a rotary brush at a nozzle for promoting separation of dust from a surface to be cleaned.

[0002]

2. Description of the Related Art A vacuum cleaner is provided with a rotary brush body at a nozzle portion for sucking dust together with air, and rubs the surface to be cleaned with the rotary brush body to promote separation of the dust from the surface to be cleaned. Is conventionally known. Further, an electric vacuum cleaner that promotes separation of dust from the surface to be cleaned by blowing a wake of an electric blower for generating a suction airflow onto the surface to be cleaned has been proposed in Japanese Patent Application Laid-Open No. Hei 7-136082. I have. The configuration of the vacuum cleaner disclosed in this publication is shown in FIGS.

FIG. 11 is a cross-sectional view of the entire vacuum cleaner viewed from the side, and FIG. 12 is a cross-sectional view of the nozzle portion viewed from above. In this vacuum cleaner, a nozzle portion 71 is attached to a cleaner body 72.
It is configured as an upright type provided below. In these figures, reference numeral 73 denotes an electric blower, and a dust collecting bag 74 is attached to a rear portion thereof. The electric blower 73 and the dust collecting bag 74 are accommodated in a main body cover 75 of the cleaner main body 72, and the main body cover 75 is provided with a lid 76 for taking the dust collecting bag 74 in and out. The cleaner main body 72 is provided with a moving handle 77, and the main body cover 75 is formed with an exhaust port 84 for discharging the downstream of the electric blower 73 to the outside of the cleaner main body 72.

[0004] A suction port 78 for sucking dust is provided on the lower surface of the nozzle portion 71, and the suction port 78 and the dust bag 74 are connected by a suction channel 79. An outlet 80 is provided forward of the inside of the nozzle portion 71 in the traveling direction toward the surface 90 to be cleaned, and the outlet 80 and the cleaner body 72 are connected by a return path 81.

When the electric blower 73 is operated, the suction flow 82
And the wake are generated at the same time, and a part 83 of the wake is discharged to the outside of the cleaner body 72 through the exhaust port 84. Another part 85 of the wake is blown from the outlet 80 to the surface to be cleaned through the return path 81. As a result, dust on the surface 90 to be cleaned is blown up, further sucked by the suction flow from the suction port 78, guided to the dust collection bag 74 through the suction flow passage 79, and collected there. The air sequentially passes from the suction port 78 provided in the nozzle portion 71 to the dust collection bag 74, the blowout port 80 provided at the end of the return path 81, and the surface to be cleaned 90, and reaches the suction port 78 again. Thus, a circulation path for constantly circulating the suction airflow is formed.

FIG. 13 is a cross-sectional view of a nozzle portion 86 having another configuration viewed from the side. The nozzle portion 86 is provided with an outlet 87 which is the same as the outlet 80, and a suction brush 88 at the rear thereof is provided with a rotating brush body 89. The rotating brush body 89 is rotated by a driving force supplied from a motor via a belt, and rubs the surface 90 to be cleaned. If the surface 90 to be cleaned is such that dust such as a carpet is easily entangled, dust may not be separated by air blown out from the outlet 87, but can be lifted up and separated by the rotating brush body 89.

However, in the configuration of the above publication, the outlet and the suction port provided at the end of the return path are separated by a wall and are separated from each other, and do not directly return to the rotating brush body provided in the suction port. There is a problem that dust such as lint or hair gets entangled in the rotating brush body. In addition, since air from the air outlet is likely to come out of the nozzle from the gap between the nozzle and the surface to be cleaned, dust blown up from the surface to be cleaned spreads around the nozzle and the suction ability is reduced. There was something.

The present applicant has proposed a vacuum cleaner capable of solving these problems in Japanese Patent Application No. 10-13667. FIG. 14 shows a main part of this vacuum cleaner. In this vacuum cleaner, a suction port is provided directly below the rotating brush body 5 of the nozzle portion 3, the rotating brush body 5 is formed in a cylindrical shape having a through hole 511 reaching from the inside to the outer peripheral surface. A return path 35 for guiding the wake to the inside of the rotating brush body 5
Is provided, and the wake of the electric blower 13 is blown from the through hole 511 to the surface to be cleaned through the suction port.

FIG. 15 shows a cross section of the rotating brush body 5. The rotating brush body 5 includes a hollow cylindrical rotating body 51, a brush 512 implanted in the hollow cylindrical rotating body 51, and a through hole 511, and the through hole 511 is formed at a position close to the brush 512. The brush 51 is formed by air blown out from the through hole 511.
Adhesion of dust such as lint to the surface 2 is prevented, and the air blown to the surface to be cleaned is immediately sucked in again, so that dust is not blown around the nozzle portion 3.

[0010]

However, in the above configuration, the production of the rotating brush body is complicated and time-consuming.
This leads to an increase in manufacturing costs. In addition, since the rotating body is hollow and has a through-hole extending from the inside to the outer peripheral surface, the strength is reduced and the body is easily damaged. To prevent this, it is necessary to form the rotating body with a large diameter. In addition, there is a problem that the size is increased and operability is impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a simple structure of a rotary brush body, is hardly entangled with dust, and can stably maintain a high suction ability. It is intended to provide a vacuum cleaner.

[0012]

According to the present invention, there is provided a vacuum cleaner having an electric blower and a dust collecting chamber, a nozzle having an opening on a lower surface, and an inside of the nozzle and a dust collector. A suction passage connecting the chambers, and a rotating brush body provided inside the nozzle portion and having a brush on the outer peripheral surface and rotating around a horizontal axis, and the air blower generated by the electric blower through the suction passage Dust is sucked together with air from the opening of the nozzle portion, captured by the dust collection bag stored in the dust collection chamber, and cleaned by rubbing the surface to be cleaned facing the opening with a rotating brush body brush. In a vacuum cleaner that promotes separation of dust from the surface, a return path is provided to guide the wake of the electric blower to the vicinity of the end of the rotating brush body, and the wake of the guided electric blower is rotated along a rotation axis. Outer peripheral surface of brush body A vent path for guiding provided at an end portion of the rotating brush body, the wake of the electric blower to blow the surface to be cleaned facing the opening through the vent passage.

In this vacuum cleaner, the air in the nozzle portion reaches the dust collection chamber through the suction passage, and after the dust is removed by the dust collection bag, returns to the inside of the nozzle portion through the return passage and returns to the interior of the rotary brush body. Blow out towards the end. Then, the air is guided by the ventilation path in the direction along the axis of the rotating brush body, guided to the outer peripheral surface of the rotating brush body, and simultaneously sprayed onto the surface to be cleaned. The air guided to the outer peripheral surface of the rotating brush body by the ventilation path prevents dust from adhering to the brush provided on the outer peripheral surface of the rotating brush body, and blows off the attached dust from the brush. The suction force by the electric blower is generated inside the nozzle part,
The air blown to the surface to be cleaned is sucked into the suction path again. Therefore, the circulating air does not go out of the nozzle portion, dust does not spread around the nozzle portion, and the suction force does not easily decrease.

Further, in the present invention, a pulley for receiving a rotational force is provided at an end of the rotary brush body, and the pulley is provided with a through hole serving as the ventilation path, and air is rotated to rotate the outer peripheral surface of the rotary brush body. A blower fan for blowing is provided inside the through hole. The blower fan rotates with the rotation of the pulley, and the air from the return passage can be efficiently guided to the outer peripheral surface of the rotating brush body.

A rotating blade fan is provided at an end of the rotating brush body opposite to the ventilation path to send air to the outer peripheral surface of the rotating brush body by rotation. Provide an intake. Although it is difficult for the air from the air passage to reach the end of the rotating brush opposite to the air passage, the air can also be guided to the outer peripheral surface of the portion by the blade fan. Moreover, by taking in the outside air, it is possible to stably maintain the recirculation of the air and prevent the temperature of the cleaner body from rising.

Each of the vacuum cleaners having the above-described structure can be of an upright type in which the nozzle portion is provided at a lower portion of the cleaner body.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show the appearance of the vacuum cleaner according to the first embodiment. FIG. 1 is a perspective view of the vacuum cleaner as viewed obliquely from the front, and FIG. 2 is a rear view of the vacuum cleaner. This vacuum cleaner comprises a cleaner body 1 and a nozzle portion 3 provided at a lower portion thereof, and is configured as an upright type. A handle 2 for movement is provided on the upper part of the cleaner body 1.

A blower room 12 is provided at the lowermost portion of the cleaner body 1, and an electric blower 13 for generating an air flow is provided in the blower room 12. A dust collection chamber 14 is provided above the blower chamber 12, and a dust collection bag 15 is provided in the dust collection chamber 14.
Is housed. The front part of the cleaner body 1 is the body cover 1
1b, and the main body cover 11b can be opened and closed for attaching and detaching the dust collecting bag 15. The dust collection chamber 14 is closed by closing the main body cover 11b. The upstream (suction flow) side of the blower chamber 12 communicates with the dust collection chamber 14.

An electric blower 13 is provided at the front left of the cleaner body 1.
A slit-shaped exhaust hole 11c for discharging a part of the wake (exhaust flow) to the outside is formed, and a carrying hand 11d is provided on the back surface. Reference numeral 16 denotes a power switch, and 17 denotes a power cord. A rear wheel 18 for traveling is provided at the rear lower end of the cleaner body 1.

The nozzle portion 3 has a rotating brush body 5 inside, and is covered by a nozzle case 31 and a bottom cover 32. The bottom cover 32 is screwed to the nozzle case 31. The nozzle unit 3 and the cleaner body 1 are connected by a suction hose 6 and an exhaust hose 7. The suction hose 6 connects the inside of the nozzle unit 3 to the dust collection chamber 14, and the exhaust hose 7 connects the downstream side of the blower chamber 12 to the inside of the nozzle unit 3.

FIG. 3 shows a cross section of the vacuum cleaner of the present embodiment viewed from the side, and FIG. 4 shows the nozzle portion 3 viewed from below with the bottom cover 32 removed. Bosses 11 a are formed on the left and right sides of the cleaner body 1. The nozzle part 3 is attached to these bosses 11a, and rotates freely around the boss 11a as a fulcrum.

The rotary brush body 5 is horizontally disposed at the center in the left and right direction in front of the inside of the nozzle portion 3. A pulley 52 is attached to one end of the rotating brush body 5, and the shaft 13 a of the electric blower 13 and the pulley 52 are connected by a belt 33. The rotation of the electric blower 13 is transmitted to the pulley 52 by the belt 33, whereby the rotating brush body 5 rotates. A long left and right suction port 32a is formed in a portion of the bottom cover 32 facing the rotating brush body 5,
The rotating brush body 5 faces the outside through the suction port 32a.

A partition wall 31a is provided behind the rotary brush body 5, and a suction port 31b is formed on the right side. A suction-side connection pipe 34 is provided behind the suction port 31b, and a front end of the suction-side connection pipe 34 is connected to the suction port 3.
1b, the rear end is connected to the suction side hose 6 described above.

An exhaust-side connecting pipe 3 is provided on the left side of the nozzle 3.
5 is provided, and the end 7a of the above-mentioned exhaust side hose 7 is inserted into its rear end. The exhaust side hose 7 has flexibility, and its end 7 a is detachable from the exhaust side connection pipe 35. A detachable filter 7b is attached to the end 7a in order to catch fine dust leaked from the dust bag 15.

FIG. 5 is a sectional view of a main part of the rotary brush body 5 and bearing holders 41 and 42 for supporting the same. The rotating brush body 5 includes a rotating body 51 having two spiral ribs on the outer peripheral surface, and a brush 512 implanted on the upper surface of the rib. The rotating body 51 is formed by resin molding, and a brush shaft 53 is inserted into a hollow portion at the center thereof.

A pulley 52 inserted through a brush shaft 53 is fixed to the end of the rotating body 51 disposed on the downstream side by bonding or the like. An outer peripheral portion of the pulley 52 is configured to hang the belt 33, and a boss portion 523 having an insertion hole at the center is formed inside the pulley 52, and is used to connect the boss portion 523 to the inner peripheral portion of the pulley 52. Multiple ribs 521
Are provided radially. There is an opening between these ribs 521, and the inside of the pulley 52 is an air passage 522 that allows the wake to pass in the direction along the brush shaft 53. On the other hand, the end of the rotating body 51 which is arranged on the side of the suction port 31b has a cylindrical wall 513 having a concave portion to prevent the passage of suction air and scattering of dust.

It is desirable that the diameter and area of the ventilation path 522 be set as large as possible in order to recirculate the wake of the electric blower 13 as much as possible. However, pulley 52
Is limited by the size of the diameter. The amount of air passing through the air passage 522 also depends on the area of the exhaust hole 11 c of the cleaner body 1, but can be arbitrarily adjusted according to the rotation speed of the rotating body 51.

Both ends of the brush shaft 53 are supported by bearing holders 41 and 42 via bearings 43, and nuts 54 are screwed into both ends of the brush shaft 53 so as not to come off from the bearing holders 41 and 42. I have. The bearing holder 42 on the side adjacent to the pulley 52 is provided with an opening 42 b for guiding the wake of the electric blower 13 to the ventilation path 522. The bearing holder 41 on the wall 513 side has no opening. The bearing holders 41 and 42 are mounted on mounting ribs 31c and 31d provided on the nozzle case 31, and are fixed by mounting the bottom cover 32 to the nozzle case 31. Thereby, the rotating brush body 5 is rotatably supported, and the bearing holder 42 is in close contact with the front end of the exhaust-side connection pipe 35.

The flow of air in the vacuum cleaner having the above configuration will be described. When power is supplied by operating the power switch 16, the electric blower 13 rotates, and at the same time, the rotating brush body 5 also rotates. The rotation of the electric blower 13 generates a suction force, and air around the nozzle portion 3 enters the nozzle portion 3 through the suction port 32a, and the suction port portion 31b and the suction-side connection pipe 3
4. The dust enters the dust collecting chamber 14 through the suction side hose 6 in order, and further passes through the dust collecting bag 15 to reach the suction side of the blower chamber 12. With this upstream flow of the electric blower 13, dust on the surface to be cleaned below and around the nozzle portion 3 is sucked. The sucked trash is captured by the dust collection bag 15 and accumulates therein.

The air that has entered the suction side of the blower room 12 is sent to the exhaust side to be downstream. Part of this wake is exhaust hole 11
c to the outside of the cleaner body 1, and the remainder is the exhaust hose 7, the exhaust connection pipe 35, and the opening 42 of the bearing holder 42.
b, passing through the air passage 522 in the pulley 52 in order, exiting to the outer peripheral portion of the rotating brush body 5 and blowing into the nozzle portion 3;
Due to the rotation of the rotating brush body 5, it flows along the twist of the outer peripheral portion. The air blown out from the gap of the brush 512 hits the surface to be cleaned and separates dust from the surface to be cleaned. Then, it is collected again in the suction port 31b and circulates through the above-mentioned route.

The air (backstream) blown to the outer periphery of the rotating brush body 5 prevents dust from adhering to the brush 512, and
It acts so as to blow off the attached dust from the brush 512. Further, this air does not go out of the nozzle portion 3 and therefore does not blow up dust around the nozzle portion 3. Furthermore, even when the surface to be cleaned is flexible such as a carpet or the like and closes the suction port 32a at the bottom of the nozzle portion 3, the circulating air is supplied into the nozzle portion 3, so that the suction force is reduced. It becomes difficult to do.

When the detachable exhaust side hose 7 is not connected to the exhaust side connection pipe 35, the wake of the electric blower 13 is exhausted from the end 7a in a concentrated manner, and this is used to blow off dust. It can also be used as a blower.

Next, a second embodiment will be described. The vacuum cleaner of the present embodiment differs from the vacuum cleaner of the first embodiment in a partial configuration of a nozzle portion. The same portions are denoted by the same reference numerals, and duplicate description will be omitted. FIG. 6 shows the nozzle section 3
FIG. 7 is a bottom view showing a state in which the bottom cover 32 is removed, and FIG.
It is principal part sectional drawing of 42.

The rotating brush body 5 includes a rotating body 51 having two spiral ribs on the outer peripheral surface, and a brush 512 implanted on the upper surface of the rib. The rotating body 51 is formed by resin molding, and a brush shaft 53 is inserted into a hollow portion at the center thereof.

A pulley 52 inserted through a brush shaft 53 is fixed to the end of the rotating body 51 disposed on the downstream side by bonding or the like. An outer peripheral portion of the pulley 52 is configured to hang the belt 33, and a boss portion 523 having an insertion hole in the center is formed inside the pulley 52. The boss portion 523 and the inner peripheral portion of the pulley 52 are connected and rotated. A plurality of air blowing fans 524 for flowing air toward the inside of the nozzle portion 3 are provided radially. An opening serving as a ventilation path exists between these blower fans 524. On the other hand, the end of the rotating body 51 which is arranged on the side of the suction port 31b has a cylindrical wall 513 having a concave portion to prevent the passage of suction air and scattering of dust.

The method of supporting the rotating brush body 5 by the bearing holders 41 and 42 is the same as in the first embodiment. The performance of the blower fan 524 provided in the pulley 52 can be adjusted by the diameter, the shape, and the number of rotations.

The flow of air in the vacuum cleaner having the above configuration will be described. The air that has entered the suction side of the blower room 12 is sent to the exhaust side to be downstream. Part of this wake is exhausted out of the cleaner body 1 through the exhaust hole 11c, and the rest is exhausted by the exhaust hose 7, the exhaust connection pipe 35, the opening 42b of the bearing holder 42, and the blower fan 524 in the pulley 52. The brush passes through the outer peripheral portion of the rotating brush body 5 and blows out into the nozzle portion 3 in order, and flows along the twist of the outer peripheral portion due to the rotation of the rotating brush body 5. The air blown out from the gap of the brush 512 hits the surface to be cleaned and separates dust from the surface to be cleaned.
Then, it is collected again in the suction port 31b and circulates through the above-mentioned route. In the configuration of the present embodiment, the blowing fan 52
By the operation of 4, the wake can be forcibly guided to the outer peripheral portion of the rotating brush body 5.

The air (wake) guided to the outer peripheral portion of the rotating brush body 5 prevents dust from adhering to the brush 512, and
It acts so as to blow off the attached dust from the brush 512. Further, this air does not go out of the nozzle portion 3 and therefore does not blow up dust around the nozzle portion 3. Further, even when the surface to be cleaned is flexible such as a carpet or the like and closes the suction port 32a at the bottom of the nozzle portion 3, the circulating air is forcibly supplied into the nozzle portion 3 by the blower fan 524. As a result, the suction force is maintained for a longer time, so that the suction force is hardly reduced, and efficient cleaning can be performed.

The third embodiment will be described. The vacuum cleaner of the present embodiment is different from the vacuum cleaner of the second embodiment in a partial configuration of a nozzle portion. The same portions are denoted by the same reference numerals, and duplicate description will be omitted. FIG. 8 shows the nozzle section 3
FIG. 9 is a perspective view of the nozzle case 31 with the bottom cover 32 removed.

As shown in FIG. 9, an outside air inlet 31e is provided on the front side surface of the nozzle case 31 on the side of the suction port 31b. The outside air inlet 31 e guides outside air to the outer peripheral portion of the rotating brush body 5 by rotation of the suction fan 55 shown in FIG. For this reason, it is preferable to provide it near the extension of the rotation axis of the rotating brush body 5.

FIG. 10 shows a cross section of the essential parts of the rotary brush body 5 and the bearing holders 41 and 42. The rotating brush body 5 includes a rotating body 51 having two spiral ribs on the outer peripheral surface, and a brush 512 implanted on the upper surface of the rib. Rotating body 5
1 is formed by resin molding, and a brush shaft 53 is inserted into a hollow portion at the center thereof.

As in the second embodiment, a blowing fan 524 is provided inside an end of the rotating body 51 disposed on the downstream side.
The pulley 52 provided with is fixed by bonding or the like. On the other hand, a suction fan (moving blade fan) 55 is attached to an end of the rotating body 51 which is disposed on the suction port 31b side. The suction fan 55 includes a central boss 55b,
5c and a plurality of radial fans 55a for flowing air toward the inside of the nozzle portion 3 by rotation, and are integrally formed. After passing through the brush shaft 53, the end face of the boss 55b is fixed to the rotating body 51 by bonding or the like. Thus, the rotating body 51, the suction fan 55, the pulley 52, and the brush shaft 53 are integrated.

The inclination of the fan 55a of the suction fan 55 and that of the pulley 52 with respect to the brush shaft 53 of the blower fan 524 are set in opposite directions, and the rotation of the rotating body 51 causes the suction fan 55 and the pulley 52 to be opposite to each other. The air is sent in the direction (toward the center of the rotating brush body 5).

Both ends of the brush shaft 53 are supported by bearing holders 41 and 42 via bearings 43, and nuts 54 are screwed into both ends of the brush shaft 53 so as not to come off from the bearing holders 41 and 42. I have. The bearing holder 42 on the side adjacent to the pulley 52 is provided with an opening 42 b for guiding the wake of the electric blower 13 to the pulley 52. An opening 41 for guiding outside air to the suction fan 55 is also provided on the bearing holder 41 on the side adjacent to the suction fan 55.
b is provided.

The bearing holders 41 and 42 are used for the nozzle case 31.
Are fixed to the nozzle case 31 by attaching the bottom cover 32 to the mounting ribs 31c, 31d provided on the nozzle case 31. As a result, the rotating brush body 5 is rotatably supported, the bearing holder 42 is in close contact with the front end of the exhaust-side connection pipe 35, and the opening 41 b of the bearing holder 41 is provided on the front side surface of the nozzle portion 3. 31e.

The flow of air in the vacuum cleaner having the above configuration will be described. The air that has entered the suction side of the blower room 12 is sent to the exhaust side to be downstream. Part of this wake is exhausted out of the cleaner body 1 through the exhaust hole 11c, and the rest is exhausted by the exhaust hose 7, the exhaust connection pipe 35, the opening 42b of the bearing holder 42, and the blower fan 524 in the pulley 52. It passes through in order and exits to the outer peripheral portion of the rotating brush body 5 and blows out to the inside of the nozzle portion 3.

On the other hand, if the suction port 32a of the nozzle portion 3 is closed or if the amount of dust accumulated in the dust bag 5 increases, the amount of air flowing downstream decreases. When the amount of air in the downstream stream decreases, the air outside the nozzle portion 3 is drawn by the suction fan 55 rotating with the rotary brush body 5, the outside air inlet 31 e of the nozzle case 31, the opening 41 b of the bearing holder 41, and the suction fan 55. Of the rotary brush body 5 is passed through the inside of the rotary brush body 5 without resistance. This air mixes with the wake blown out from the pulley 52, is sucked into the suction port 31b, and circulates through the above-described path.

By providing the suction fan 55 and the outside air intake 31e to take in outside air, the reduction in suction force can be greatly reduced and cleaning can be performed efficiently. Adhesion of dust to the brush 512 at a location far from the guiding pulley 52 is prevented. Furthermore, the temperature rise of the circulating air is also reduced, and the life of the electric blower 13 is extended.

Here, although the configuration is such that the blower fan 524 is provided inside the pulley 52, it can be combined with a simple ventilation path 522 as in the first embodiment.

In each of the above embodiments, an example of an upright type vacuum cleaner has been described. However, the present invention can also be applied to a separate type in which the nozzle portion is separated from the vacuum cleaner main body and both move separately. . Further, although the outer peripheral surface of the rotating body constituting the rotating brush body has a shape having spiral ribs, the outer peripheral surface of the rotating body may be a cylindrical surface without ribs. However,
In the configuration in which the spiral rib is provided, the wake is easily directed to the surface to be cleaned by the side surface of the rib, so that the separation of dust from the surface to be cleaned is facilitated.

[0051]

According to the first aspect of the invention, since the wake of the electric blower is guided to the outer peripheral surface of the rotating brush body, dust is prevented from adhering to the brush and the suction force is reduced. The decrease is also reduced and the suction efficiency is improved. In addition, there is no need to make the rotating brush body a special structure, and its manufacture is easy.

In the vacuum cleaner of the present invention, since the inside of the pulley is provided as an airflow passage for the downstream side and the blower fan is provided here, the downstream side can be guided to the outer peripheral surface of the rotating brush body more quickly. In addition, the effect of preventing dust from adhering to the brush and improving the suction efficiency is further enhanced.

According to the third aspect of the invention, since the outside air can be taken into the nozzle portion without resistance, the suction force hardly decreases, and efficient cleaning can be continued for a long time. In addition, the temperature rise of the air is reduced, and the life of the electric blower is extended. In addition, since outside air is taken in from the side opposite to the side where the wake is introduced, and is guided to the outer peripheral surface of the rotating brush body, dust is prevented from adhering to the brush in a portion where the wake is difficult to reach. You.

Since the vacuum cleaner of the fourth aspect is of the upright type, the structure for circulating air between the cleaner body and the nozzle portion can be simplified, and the area of the suction port can be increased. it can. Therefore, manufacturing costs are reduced,
Cleaning efficiency is also improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a vacuum cleaner according to a first embodiment.

FIG. 2 is a rear view of the electric vacuum cleaner according to the first embodiment.

FIG. 3 is a side sectional view of the electric vacuum cleaner according to the first embodiment.

FIG. 4 is a bottom view of the vacuum cleaner of the first embodiment with a bottom cover of a nozzle portion removed.

FIG. 5 is an essential part cross-sectional view of a rotary brush body and a bearing holder provided in the nozzle unit of the first embodiment.

FIG. 6 is a bottom view of the vacuum cleaner of the second embodiment with the bottom cover of the nozzle removed.

FIG. 7 is a sectional view of a main part of a rotary brush body and a bearing holder provided in a nozzle unit according to a second embodiment.

FIG. 8 is a bottom view of the vacuum cleaner of the third embodiment with the bottom cover of the nozzle removed.

FIG. 9 is a perspective view of a nozzle case of a vacuum cleaner according to a third embodiment.

FIG. 10 is an essential part cross-sectional view of a rotary brush body and a bearing holder provided in a nozzle unit according to a third embodiment.

FIG. 11 is a side sectional view of a conventional vacuum cleaner.

FIG. 12 is a plan sectional view of a nozzle portion of the conventional vacuum cleaner.

FIG. 13 is a side sectional view of a nozzle portion of another configuration of the conventional vacuum cleaner.

FIG. 14 is a bottom view of another conventional vacuum cleaner with the bottom cover of the nozzle removed.

FIG. 15 is a sectional view taken along the line AA in FIG. 14;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum cleaner main body 2 Handle body 3 Nozzle part 5 Rotating brush body 6 Suction side hose 7 Exhaust side hose 11b Body cover 11c Exhaust hole 12 Blower room 13 Electric blower 14 Dust collection room 15 Dust collection bag 31 Nozzle case 31a Partition wall 31b Suction Mouth portions 31c, 31d Mounting ribs 31e Outside air intake 32 Bottom cover 32a Suction port 33 Belt 34 Suction side connection pipe 35 Exhaust side connection pipe 41 Bearing holder 41b Opening 42 Bearing holder 42b Opening 43 Bearing 51 Rotating body 52 Pulley 53 Brush shaft 55 Suction fan 55a Fan 512 brush 513 wall 521 rib 522 opening 524 blower fan

Claims (4)

[Claims] 1. A cleaner body having an electric blower and a dust collecting chamber, a nozzle having an opening on a lower surface, a suction path connecting the inside of the nozzle to the dust collecting chamber, and an inside of the nozzle. A rotating brush body having a brush on the outer peripheral surface and rotating about a horizontal axis, and sucking dust together with air from the opening of the nozzle portion through the suction passage by the airflow generated by the electric blower. The suctioned dust is captured in the dust collection bag accommodated in the dust collection chamber, and the separation of the dust from the surface to be cleaned is performed by rubbing the surface to be cleaned facing the opening with the brush of the rotating brush body. In the vacuum cleaner to promote, while providing a return path that guides the wake of the electric blower to near the end of the rotating brush body, the wake of the guided electric blower along the axis of the rotating brush body Outer surface Vacuum cleaner provided with a vent path to the end portion of the rotary brush member, characterized in that the wake flow of the electric blower was blown to the surface to be cleaned facing said opening through said vent path for guiding. 2. An end portion of the rotating brush body includes a pulley for receiving a rotational force, the pulley is provided with a through hole serving as the ventilation path, and sends air to the outer peripheral surface of the rotating brush body by rotation. The vacuum cleaner according to claim 1, further comprising a blower fan for the inside of the through hole. 3. A rotating blade fan for sending air to an outer peripheral surface of the rotating brush body by rotation at an end of the rotating brush body opposite to the ventilation path, wherein the rotating blade fan of the nozzle portion is provided with a rotating blade fan. The vacuum cleaner according to claim 1 or 2, wherein an outside air intake is provided at a portion facing the outside. 4. The vacuum cleaner according to claim 1, wherein the nozzle portion is provided at a lower portion of the cleaner body and is of an upright type.