JPH04193136A - Self-propelled cleaner - Google Patents

Abstract

PURPOSE:To obtain a sufficient cleaning effect without damaging the wall face and floor face by providing the second suction port with the cross section area smaller than that of the first suction port opened to be faced to the floor face on a suction structure section. CONSTITUTION:A suction structure section 4 has the first suction port 8 with the shape similar to the conventional one provided at the center section on the bottom face and the slender nozzle-shaped second suction port 9 with a smaller cross section area provided at the front end section. Suction air streams 10, 11 from a suction motor 5 and a fan 6 are fed to the first and second suction ports 8, 9 respectively. When the corner of a room along the wall face is to be cleaned, the second suction port 9 of the suction structure section 4 is moved near the wall face to suck the dust at the corner of the room. The dust existing apart from the wall face is sucked through the first suction port 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the mechanical structure of a self-propelled vacuum cleaner, and particularly to a dust suction structure.

[Prior Art] As shown in FIGS. 4(a) and 4(b), a conventional self-propelled vacuum cleaner 20 includes a wheel 22 provided at the bottom of a main body 21 and a motor 23 that drives the wheel 22. , a suction motor 24 that creates a negative pressure for suctioning dust, a fan 25, a suction structure 26 that suctions dust close to the floor surface, and a brush rotatably attached to this suction structure 26. 27 and
A dust pack 28 is disposed between the suction structure 26 and the fan 25 and collects dust, and the main body 21 moves on the floor with wheels 22 and sucks the dust on the floor from the suction structure 26. was.

In addition, when cleaning a corner of a room as shown in the figure, the brush 27 comes into contact with the wall surface, and as the main body 21 moves, the brush 27 rotates in the direction of the arrow to clean the dust accumulated in the corner of the room. It was designed to be taken into the suction structure 26.

[Problem to be solved by the invention] As described above, in the conventional self-propelled vacuum cleaner, the brush 27 attached to the suction structure 26 sucks the dust in the corner of the room.
As shown in FIGS. 4(a) and 4(b), the brush 27 may hit the wall and floor of the room, damaging the wall and floor, and the brush 27 may become entangled with dust. Depending on the state of the brush 27, there is a problem that dust cannot be taken in and a sufficient cleaning effect cannot be obtained.

These problems are not as much of a problem with traditional manual vacuum cleaners, where humans are constantly monitoring the suction structure and brushes, but with self-propelled vacuum cleaners, humans are constantly monitoring the equipment. There was no monitoring of the operating status, and such a thing was truly unreasonable considering the purpose of a self-propelled vacuum cleaner.

Therefore, an object of the present invention is to provide a self-propelled vacuum cleaner that can obtain sufficient cleaning effects without damaging walls and floors.

[Means for Solving the Problems] Therefore, in order to solve the above-mentioned problems, Book 1 provides a system that, while running on wheels driven by a motor on the floor,
In a self-propelled vacuum cleaner that sucks dust on a floor from a suction structure using suction pressure from a suction motor, the suction structure includes a first suction port that is opened to face the floor;
A second suction port having a smaller cross-sectional area than the first suction port is provided.

[Function] According to this invention, in addition to the first suction port having the same structure as a conventional suction port, a second suction port having a smaller cross-sectional area than the first suction port is provided in the suction structure. Therefore, a larger negative suction pressure is generated in the second suction port than in the first suction port, and dust and heavy dust from the corners of the room can be sucked out from here, so there is no possibility of damaging the walls or floor of the room. It can be cleaned efficiently without any problems.

[Example] Next, an example of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 is a sectional view of a self-propelled vacuum cleaner according to this embodiment.

FIG. 2 is an enlarged sectional view of section A in FIG. 1.

FIGS. 3(a) and 3(b) are cross-sectional views showing the suction operation of the self-propelled vacuum cleaner according to this embodiment.

As shown in FIG. 1, the self-propelled vacuum cleaner according to the present invention includes a main body 1, a wheel 2 provided at the bottom of the main body 1, a traveling mower 3 that drives the wheel 2, and a movable cleaner 3 that is close to the floor. a suction structure 4 that suctions dust, a suction motor 5 that creates negative pressure to suction dust, a fan 6, and a dust bag 7 that is disposed between the suction structure 4 and the fan 6 and that collects dust. It is composed of.

In addition, as shown in FIG. 2, the suction structure 4 has a first suction port 8 provided at the center of the bottom surface and having a similar shape to the conventional suction port, and a first suction port 8 provided at the front end that is different from the conventional suction port. It has a second suction port 9 in the form of a thin nozzle with a reduced cross-sectional area.

Suction air flows 10111 from the suction motor 5 and fan 6 are supplied to the first and second suction ports, respectively.

Next, the operation of this embodiment will be explained based on FIGS. 3(a) and 3(b).

As shown in FIG. 3(a), when cleaning a corner of a room along a wall, move the second suction port 9 of the suction structure 4 close to the wall to suck out dust in the corner of the room. do. Further, dust located away from the wall surface is sucked through the first suction port 8 as before.

In addition, as shown in FIG. 3(b), when cleaning a floor surface away from a wall surface, light dust such as cotton dust is removed from the first suction port 8.
Heavy dust that cannot be suctioned by the first suction port 8 is suctioned by the second suction port 9.

This is proven by Bernoulli's theorem, which states that the smaller the cross-sectional area through which the airflow passes, the greater the pressure difference will be before and after it.For this reason, the second suction port should have a smaller cross-sectional area. By increasing the speed of the suction air flow 10, a large pressure difference is generated between the suction air flow 10 and the floor surface, so that heavy dust can be suctioned.

[Effects of the Invention] As explained above, the present invention has a suction structure including a first suction port having a structure similar to a conventional suction port, and a second suction port having a smaller cross-sectional area than the first suction port. Since a suction port is provided, the second suction port is installed.
A larger suction negative pressure is generated in the suction port than in the first suction port, and dust and heavy dust in the corners of the room can be sucked in from here, so it can be used efficiently without damaging the walls or floor of the room. Can be cleaned.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the self-propelled vacuum cleaner according to the present embodiment, showing a suction operation. Figures 4) and 4m) are cross-sectional views of a conventional self-propelled vacuum cleaner. 1. Main body, 4. Suction structure 8. First suction port 9. Second suction port Applicant for utility model registration: NEC Home Electronics Co., Ltd. 〆

Claims (1)

[Scope of Claims] A self-propelled vacuum cleaner that suctions dust on the floor from a suction structure using suction pressure from a suction motor while traveling on the floor using wheels driven by a motor, the suction structure comprising: A self-propelled vacuum cleaner characterized in that a first suction port opening facing a floor surface and a second suction port having a smaller cross-sectional area than the first suction port are provided.