JPH0346319B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a dust collector, in particular, a dust collector that is attached to the bottom of a blackboard, etc., and collects floating chalk powder generated when the blackboard is erased. This invention relates to a blackboard dust collector that can maintain a clean environment not only near the blackboard, but also in a classroom or a room where the blackboard is installed.

[Conventional technology]

When letters, etc. are written on a blackboard with chalk and then erased with a blackboard eraser, some of the chalk powder goes into the toy attached to the blackboard, and the other part floats in the air. Among these floating chalk powder, those with a diameter of 1 μm or less remain suspended in the air forever, and those with a diameter of 1 μm or less
Items up to 100 μm will gradually settle.
However, since there is generally airflow indoors, even the large objects mentioned above will remain suspended in the air for a long time.

Chalk powder floating in the air ends up on the floor,
It adheres to desks, people's hair, or clothing, and along the way, it can enter the human body through breathing or adhere to the surface of the eyeballs.

Also, among the dust made of such chalk powder, those with a diameter of 10 μm or more remain in the nose and trachea during breathing and are expelled from the body. Small particles with a diameter of 1 μm or less reach the lungs when breathed, but most of them are expelled through respiration, leaving some behind, so they do not have much of a negative impact on the human body.

However, after being inhaled into the lungs, or during the process, the particles stick to each other, causing the particle size to decrease.
Many of them exceed 1 μm, and these and diameters of 1 to 10 μm
After the dust reaches the lungs, it tends to settle in the alveoli, and its component is calcium sulfate, which is not very soluble in water. Therefore, if a large amount of such deposits accumulates in the lungs, it can lead to pneumoconiosis. In addition, it can cause allergic irritation in people with idiosyncratic constitutions, cause nasal or pharyngeal catarrh, asthma, etc., and interfere with the healthy growth of the alveoli and other parts of the body.

Furthermore, if it comes into contact with the eyeballs, it will cause harm to the eyeballs because it does not dissolve in water, and
For the same reason, if it gets on your clothes, hair, or desk, it can stain them.

Especially in recent years, as rooms have become more airtight as air-conditioning and heating systems have been installed, these problems become more noticeable when a blackboard is installed in such a room.

[Problem that the invention seeks to solve]

The present invention was developed based on the above circumstances, and its main purpose is to prevent respiratory diseases caused by people who stay in a room where a blackboard is used for a long time or work near a blackboard. The present invention provides a dust collector for a blackboard without a dust collector.

Another object of the present invention is to provide a dust collector for blackboards that can prevent children from inhaling chalk powder and not only from suffering from the above-mentioned diseases but also from inhibiting healthy growth. It is something.

Another object of the present invention is to provide a blackboard dust collector that does not stain the floors and other facilities surrounding the blackboard, as well as people's clothing and hair.

Another object of the present invention is to provide a blackboard dust collector that prevents the blackboard user and those in the vicinity from deteriorating visual acuity and eyeball diseases.

[Means for solving problems]

In order to achieve such an objective, the present invention
an outer frame, an inlet with a downward opening formed horizontally in the upper part of the front surface of the outer frame, an outlet with a downward opening formed in the bottom surface of the outer frame, and an outlet on the inlet side in the outer frame. It is composed of a dust collection unit arranged in the outer frame and a fan arranged on the outlet side in the outer frame, and the upper surface of the outer frame is arranged directly or close to the lower part of the blackboard, and the bottom surface of the outer frame is arranged in the lower part of the blackboard. It is placed facing the floor directly below.

[Effect]

In this case, chalk powder generated from the blackboard will not be scattered around the blackboard, but will be absorbed by the dust collector placed directly below the blackboard.

〔Example〕

FIG. 1 is a front view showing an embodiment of a blackboard dust collector according to the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG. First, in FIG. 1, there is a blackboard 1, and toys 2 are provided on the bottom side of the blackboard 1. A dust collector 3 having approximately the same length as the blackboard 1 is arranged below the blackboard 1, that is, directly below the toy 2. As shown in FIG. 2, the dust collector 3 has approximately the same depth and width as the toy 2, and has a height sufficient to maintain a sufficient space between it and the floor. The dust collector 3 having a substantially rectangular parallelepiped outer frame with such length, width and height is provided with a suction port 4 at the front surface directly below the toy 2. The suction port 4 has approximately the same length as the blackboard 1. There is a space 5 in the dust collector 3 in the area where the suction port 4 is provided,
A dust collection unit 6 is arranged below this space 5. A prefilter 7 is arranged in the space 5 so as to define a space near the suction port 4 and a space near the dust collection unit 6. This prefilter 7 has the function of capturing relatively coarse dust, and is made of, for example, resin nonwoven fabric or net, and is designed to be removable and washable. The dust collection unit 6 is constituted by, for example, a two-stage charge type electrostatic type electrostatic dust collection unit whose structure itself is known. Further, a fan 9 is arranged below the dust collector 6 via an after filter 8, and the air sent out by the fan 9 is discharged toward the floor directly below the dust collector 3. A downwardly opening outlet is attached to the lower surface of the dust collector 3 in a horizontally long manner.

Next, the operation of the blackboard dust collector configured as described above will be explained. First, as shown in FIG. 2, when characters written on the blackboard 1 are erased, chalk powder begins to float as shown in the figure. This chalk powder adheres to each other (most of them are not spherical but rod-shaped) and rarely have a diameter of less than 1 μm.
Most of them are rod-shaped with a size of about 1 μm to 50 μm. Note that some of these chalk powders have a diameter of 100 μm or more, but the number is small and
Most of the materials are deposited in the toy 2 provided under the blackboard 1. in this way,
As is clear from the above, particles with a diameter of about 1 μm to 100 μm float in the air, but unlike particles with a diameter of 1 μm or less, they gradually fall down. Dust collector 3 fan 9
If it is in operation, chalk powder floating and falling in the air will be taken into the suction port 4. The chalk powder taken in in this way first passes through the prefilter 7, and at this time, the relatively large chalk powder is captured by the prefilter 7, and the rest reaches the dust collection unit 6. become. The air taken into the dust collector 6 is cleaned by the action of the dust collector 6 and blown out through the fan 9 toward the floor directly below the dust collector 3.

According to the blackboard dust collector described above, most of the chalk powder that is generated by erasing characters written on the blackboard floating in the air can be captured, so the blackboard is used. People who stay in rooms for long periods of time or work near blackboards will no longer suffer from respiratory illnesses. In addition, for the same reason, children can be prevented from inhaling chalk powder and not only from suffering from the above-mentioned diseases but also from having their healthy growth inhibited. It also prevents staining the floors and other facilities around the blackboard, as well as people's clothing and hair. Furthermore, it will be possible to prevent the blackboard user and those in the vicinity from deteriorating their visual acuity and suffering from eyeball diseases.

In addition, as shown in this embodiment, the dust collector 3
A suction port 4 is provided in the front directly below the blackboard in the upper part of the dust collector 3, and the air sucked in through the suction port 4 and from which chalk powder has been removed is discharged from directly below the dust collector 3 toward the floor. For this reason,
As shown in Figure 3, the air blocked by the floor is
The short circuit does not go far from the dust collector 3, but toward the suction port 4. This means that when compared with the case where the air outlet 10 from the dust collector unit 6 is provided at the front part of the dust collector as shown in Fig. 4, the effect can be easily obtained from the air flow. I understand. Therefore, in the case of this embodiment, the chalk powder that did not directly enter the suction port 4 is collected again, which increases the dust collection efficiency and has the effect of not scattering the chalk powder indoors. .

In the above embodiment, the suction port area of the suction port 4 and the blowout port area of the air blowing out from the dust collection unit 6 are each set to be arbitrary. However, the suction port area may be made smaller than the blowout area. In this case, the dynamic pressure of the air flow near the suction port can be increased, and chalk powder having a somewhat large particle size can be easily sucked into the suction port 4. Furthermore, since the flow velocity of air from the outlet can be reduced, short circuiting can be made easier. For the same reason, the dust on the floor will not be blown up, and the temperature at the feet of people standing nearby will not be lowered.

Further, in the above-described embodiment, the dust collector 3 has a length equal to the length of the blackboard 1, but as shown in FIG. It goes without saying that the structure may be arranged such that each of them is arranged separately.

〔Effect of the invention〕

As explained above, according to the blackboard dust collector of the present invention, most of the chalk powder floating in the air that is generated when erasing characters written on a blackboard can be captured. , people who stay in rooms with blackboards for long periods of time or work near blackboards will no longer suffer from respiratory illnesses. In addition, for the same reason, children and others not only inhale chalk powder and suffer from the above-mentioned diseases, but also
It can prevent healthy growth from being suppressed.
In addition to the floor and other facilities around the blackboard,
No more staining people's clothes or hair. moreover,
It will be possible to prevent the blackboard users and those nearby from suffering from visual acuity deterioration and eyeball diseases.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a blackboard dust collector according to the present invention, FIG. 2 is a sectional view taken along line AA of the blackboard dust collector, and FIGS. 3 and 4 are blackboard dust collectors according to the present invention. FIG. 5 is a diagram showing another embodiment of the blackboard dust collector according to the present invention. 1...Blackboard, 2...Toy, 3...Dust collector, 4
...Suction port, 6...Dust collection unit, 9...
Juan.

Claims (1)

[Scope of Claims] 1. An outer frame, a horizontally elongated suction port formed on the upper part of the front surface of the outer frame, a downwardly opening air outlet formed laterally on the bottom surface of the outer frame, and an air outlet in the outer frame. It is composed of a dust collection unit disposed on the suction port side and a fan disposed on the blowout port side within the outer frame, and the upper surface of the outer frame is disposed directly or close to the lower part of the blackboard, and the outer frame A dust collector for a blackboard, characterized in that the bottom surface is placed toward the floor directly below the bottom surface. 2. The blackboard dust collector according to claim 1, wherein the area of the suction port is smaller than the area of the air outlet.