JPS6140414B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement of a vacuum cleaner, and the size of dust particles that can be removed by a vacuum cleaner has been reduced to about 10μ from the current standard.
The purpose is to widen the particle size to about 0.02μ to avoid fine powder being discharged from the rear of the vacuum cleaner.

Conventionally, vacuum cleaners have generally had a net-like main filter for the purpose of removing coarse dust, and a main filter made of cloth or filter paper for the purpose of removing small-sized dust. Due to the relationship with performance, it is impossible to make the openings of the main filter smaller than a certain level, so we strive to increase the surface area as much as possible, lower the ventilation resistance, and increase the removal rate of the main filter. I came. However, increasing the surface area unnecessarily is limited by the usability of vacuum cleaners, so it cannot be done to an extreme degree.

For this reason, some devices are equipped with an additional filter for fine dust, but unfortunately they have not become mainstream due to the ventilation pressure loss.
In particular, in recent years it has been found that the cleaning performance of vacuum cleaners mainly depends on the airflow rate, and as most airflow type electric blowers are used, it has become even more difficult to remove fine dust due to the drop in filter pressure drop. It's coming.

The present invention aims to collect fine dust without increasing ventilation pressure loss, and embodiments thereof will be described below based on the drawings.

In the figure, 1 is a main body with a built-in electric blower 2, 3 is a dust collection box that is removably connected to the main body, and the front part is made of conductive rubber mixed with carbon powder [for example, made by National Tire Co., Ltd.]. FA−
Hose 4 made of conductive material such as 9BP022]
A conductive filter 6 such as an activated carbon filter is provided at the rear part connected to the main body 1, and this filter 6 and the suction port 5
A dust storage space 7 for storing dust is formed between the two.

In the above configuration, to first explain the operation of the dust-containing airflow, the dust-containing air sucked by the electric blower 2 has a cross-sectional area at the suction port 5 that is smaller than in relation to suction performance. It passes at a high speed. When fluid, etc. moves at high speed inside a pipe, friction between the pipe wall and dust particles causes
A kind of triboelectric phenomenon occurs, whereby the tube wall and the dust particles are charged to different polarities. That is, since electrons with high mobility move from the dust particles to the tube wall, the tube wall becomes negatively charged, and the dust particles become positively charged.

In this way, the hose 4 and the suction port 5 form a tubular passage, and this tubular passage essentially functions as a positively charged portion for dust particles.

Furthermore, it has been experimentally revealed that the charging voltage at this time usually reaches a high voltage of several +KV rather than several kilovolts, and has a very effective charging ability.

Now, in a general dust collection method, charged dust particles are mechanically captured by a filter, regardless of their electrical charge. If you look at this electrically, it will look like Figure 2.

That is, if a positive charging section is configured with a negative electrode a and a discharge wire b, and the positive electrode of a high-voltage DC power supply c is connected to the discharge wire b, and the negative electrode is connected to the negative electrode a, the dust passing through the charging section Since the particles are positively charged, they are considered to correspond to tubular channels. A normal vacuum cleaner has a filter d placed behind the charging section. In this case, many fine dust particles pass directly through the ventilation path of the filter d.

In contrast, in this embodiment, more efficient dust collection can be achieved by focusing on the fact that dust particles are positively charged and taking electrostatic collection into account. be.

The present embodiment will be explained below using the electrical circuit shown in FIG. 3.

That is, the tubular passage gradually collects negative charges and has a very high potential, but since the tubular passage is electrically connected to the conductive filter 6, it also has a high potential. , once the potential reaches a certain level, it will not rise any higher, so
As shown in FIG. 3, the negative terminal of a DC high voltage power supply e is connected to a conductive filter 6 through a limiting resistor f.

Therefore, the electrostatic dust collection mechanism is completely realized between the charged dust and the conductive filter 6, and even fine dust can be reliably collected. More specifically, positively charged fine dust particles electrostatically adhere to the conductive filter 6. At this time, the dust becomes entangled with the material of the filter 6, and even if the positive charge is eliminated (neutralized) by touching the filter 6, it is mechanically retained as it is. In the case shown in FIG. 2, there is some dust that passes through without touching the filter material, and the superiority of this embodiment can be understood in this respect.

Further, in this embodiment, relatively large dust particles are captured by the filter 6 purely mechanically.

In this example, mechanical capture is also performed using a conductive filter, but in order to maintain the life of this filter for a long time, a pre-filter should be placed in front of the breathable electrode, or a ventilation filter should be installed. The conductive electrode itself may be made of a wire mesh or the like to function as a pre-filter.Furthermore, if a main filter for capturing fine dust is placed before the conductive filter, the dust collection efficiency can be further improved. It can be made good.

As described above, according to the present invention, charged particles that are charged while passing through a hose or the like are guided to a conductive filter by a breathable electrode, and it is possible to remove dust particles with a minimum particle size of about 0.02μ, which has an industrial value. is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a vacuum cleaner according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the electrical relationship of a general vacuum cleaner, and FIG. 3 is a diagram showing the electrical relationship of the vacuum cleaner of the present invention. It is an explanatory diagram. 4... Hose, 6... Conductive filter, 7...
...Dust collection space.

Claims (1)

[Claims] 1. A non-conductive dust collection space is arranged at the rear stage of a tubular passage made of a conductive hose, etc., and a conductive filter is arranged at the rear of this dust collection space, and a conductive filter and a A vacuum cleaner characterized in that the tubular passage is electrically connected to the vacuum cleaner. 2. The vacuum cleaner according to claim 1, characterized in that a pre-filter is disposed before the conductive filter. 3. The vacuum cleaner according to claim 2, characterized in that a main filter made of a normal filter material is disposed between the conductive filter and the pre-filter.