JPS5819302B2 - Mask to prevent infiltration of external contaminated air - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protective mask that fits closely against the face, isolates the mouth and nostrils from external contaminated air, takes in clean air through an intake valve, and exhausts air through an exhaust valve.

Protective masks that have traditionally been widely used for dust and gas prevention include blower-type masks that use pressurized clean air using a pump or cylinder to keep the inside of the mask at a higher pressure than the outside air at all times; There is a type that is directly connected to a filter, which the person wearing the mask inhales using the force of their lungs, but in the former type, the pressure inside the mask is always higher than that of the outside air, so there is a risk that contaminated air from outside can leak inside and enter the mask. Although there are very few cases, the disadvantage is that the equipment is expensive and requires a lot of work.

In addition, most of the latter types that are directly connected to the filter have a structure that does not maintain the pressure inside the mask at a higher pressure than the outside air at all times, and the pressure inside the mask becomes lower than the outside pressure when inhaling.
Contaminated air from outside often enters the mask through the gap between the mask and the face, which is undesirable from a health and safety standpoint.

Conventionally, the shape and material of the mask were selected to prevent leakage and infiltration, and efforts were made to ensure that it adhered closely to the face, but faces vary widely in size and shape, and one size and one design mask can cover all types of masks. It is impossible to try to fit it to the face, and it is impossible to completely fit it to the face because of the distortion of the face due to breathing, vocalization, etc., and it is impossible to completely prevent the intrusion of external contaminated air. This has become a problem.

Generally, the breathing action using a mask is done after inhaling clean air.
Repeat the pumping cycle.

If these are done simultaneously inside the mask, part of the exhaust air will remain inside the mask when exhaling, and when inhaling, the exhaust gas remaining inside the mask will be inhaled before breathing in clean air. .

However, exhaust air is clean air that is once inhaled into the lungs and then exhaled again, so although it contains less oxygen and more carbon dioxide and moisture than clean air, it is not harmful to the body when inhaled. .

This invention was conceived with the above points in mind.The mask has a two-layer structure consisting of an outer tight band and an inner tight band, and a space is provided here, and exhaust air is guided into this space to prevent mask leakage. The intrusion is such that harmless exhaust air enters so that the intrusion of external contaminated air is eliminated or significantly reduced.

The present invention will be described below based on embodiments shown in the drawings.

In the embodiment shown in FIGS. 1 to 4, reference numeral 1 denotes a mask body, which covers the nostrils and mouth and blocks contaminated air from outside.

Reference numeral 2 is a rubber band or the like attached to the mask body 1, which is hooked onto the human head to bring the mask main body 1 into close contact with the face.3 is a filter case that contains a filter (not shown) and prevents external contaminated air from entering the body. is filtered here.

4 is a ventilation pipe that continues to the filter case 3, and the other end is attached to the mask body 1, and the clean air that has passed through the filter is guided to the mask body/body 1 through the ventilation pipe 4, passes through an intake valve 10 (described later), and enters the inside of the mask. It has a structure that leads to 11.

As shown in FIGS. 2 and 3, the mask body 1 has a double structure with an outer adhesion band 5 provided outside the inner adhesion band 6 and a space 7.
The edges of each of the outer adhesion band 5 and the inner adhesion band 6 are in close contact with the face.

Reference numeral 10 denotes an intake valve, which is provided at a location where the inner tight band 6 and the ventilation pipe 4 are joined, and its details include a valve seat 12 fixed to the inner tight band 6, and a cap having a vent/port 15, as shown in FIG. 14 and a valve body 13 floating within the cap 14.

Reference numeral 8 denotes an exhaust valve, which is provided below the inner tight band 6 and facing the space 7, and its structure is exactly the same as the intake valve 10.

Reference numeral 9 denotes an exhaust outlet provided above the outer tight band 5.

Next, the operation of this embodiment will be explained.

When the rubber band 2 is hooked around the head and the mask body 1 is attached to the face to inhale, external contaminated air passes through the filter case 3, becomes clean air, and is guided to the intake valve 10 as shown by the arrow through the ventilation pipe 4. I'm scared.

As described above, the intake valve 10 includes a valve seat 12 that opens on the upstream side of the airflow, and a valve body 13 that is arranged to close the outside of the valve seat 12.
It is composed of a cap 14 that holds the valve body 13 while allowing movement, so when inhalation occurs, the inside of the mask 11
The pressure decreases, a pressure difference is generated, and the valve body 13 moves toward the cap 14. Clean air is guided into the mask interior 11 through the vent 15, and can be inhaled.

Then, when the air is exhausted, the space 7 is filled with the exhaust gas that is sent through the exhaust valve 8 every time the breath is exhausted.

At the same time, the air that was in space 7 is released from outlet 9.
It will be pushed out and replaced.

By introducing the exhaust gas that has passed through the exhaust valve 8 into the space 7 formed by the outer tight band 5 and the inner tight band 6 and filling it, the following effects can be obtained.

When a leak occurs due to poor adhesion of the inner tight band 6 to the face, it is the exhaust air filling the space 7 that invades the mask interior 11, and further when a leak or ventilation occurs in the outer tight band 5, it invades the inside of the mask 11. After the external contaminated air is mixed with the exhaust gas filling the space 7 and diluted, this mixed gas enters the inside of the mask 11 through the leakage part of the inner tight band 6.

Further, since the exhaust gas sent through the exhaust valve 8 replaces the air in the space 7 for each exhaust of breath, the external contaminated air that has previously entered the space 7 is wiped away and does not accumulate.

In any case, the amount of intrusion of external contaminated air that accounts for the amount of leakage into the mask interior 11 can be greatly reduced.

No matter how perfectly the mask is made to fit tightly against the face, as mentioned above, leakage is inevitable due to facial expressions and other factors, and it is not possible to prevent the intrusion of external contaminated air, but as in this example, space 7 is provided. As a result, the invading external contaminated air is diluted here and then enters the inside of the mask 11, so the amount of invading external contaminated air is a small amount, less than a few, and the inevitable leakage of the mask is reduced. It can be made more secure against danger.

It should be noted that if the outer adhesive band 5 and the inner adhesive band 6 are manufactured integrally from the same material, they can be made strong and light, but they may be made of a different material and fixed with an adhesive or the like.

Further, the outer tight band 5 produces the above effect if it plays the role of retaining the exhaust gas in the space 7, so it does not necessarily need to be completely airtight and may be made of a porous material such as urethane sponge.

The discharge port 9 for discharging the space air from the space 7 to the outside is preferably provided at a position where the airflow is created so that the exhaust air can effectively replace the space air. For example, as shown in FIGS. When the discharge port 9 is provided at the lower part of the nose, one or more holes are dedicated to the nose and open to the outside.

The discharge port 9 may be a hole equipped with a constant pressure exhaust valve to make it difficult for outside contaminated air to enter.

Alternatively, a part or all of the outer adhesion band 5 may be made of a porous material such as a sponge without providing any specific holes, and the spatial air may be released through the fine pores of the porous material.

In order to further increase the effects of the embodiments described so far, it is preferable to provide a gas container 17 and a constant pressure exhaust valve 18 in a part of the outer tight band 5, and this case is shown in FIG.

In the actual case shown in FIG. 5, the gas container 17 is constructed in the shape of a bellow or balloon made of an elastic material such as rubber, or is made of a combination of a bag made of an inelastic material such as an airtight vinyl sheet and a spring.
It has a structure that expands and contracts in conjunction with the pressure of the exhaust gas filling the inside, allowing its volume to vary within certain limits.

The constant pressure exhaust valve 18 operates when the exhaust pressure exceeds a set value,
The exhaust gas is discharged to the outside, and a reverse valve structure is used to prevent contaminated air from entering from the outside.

The operating pressure of the constant pressure exhaust valve 18 is set to be lower than the exhaust pressure of the lung force, and generally 6 mmH2O is appropriate, and the contraction force of the gas container 17 is preferably set to an internal pressure of less than 6 mmH2O.

In this way, the gas container 17 and the constant pressure exhaust valve 1 are attached to the outer tight band 5.
8, when in use, the exhaust gas is pushed out from the exhaust valve 8 by the force of the lungs, filling the space 7 and inflating the gas container 17.

Even after the gas container 17 is filled with exhaust gas until its expansion reaches its limit, the pressure in the space 7 increases as the gas continues to be exhausted.

When the pressure in space 7 exceeds 6 mmH2O, constant pressure exhaust valve 1
8 is activated to discharge exhaust gas to the outside and replace it.

Next, after the exhaust stops, the space 7 and the gas container 17 are sealed by the constant pressure exhaust valve 18 having a reverse valve structure, and the inside is filled with less than 6 mm of exhaust gas to maintain a higher pressure than the outside. It can prevent the intrusion of external contaminated air.

The pressure inside the mask 11 drops to a low level due to intake air, and if a gap leak occurs in the inner tight band 6, the exhaust air in the space 7 will enter the mask interior 11, but this intrusion will cause the exhaust air in the space 7 to Even if the amount decreases, if it is below the expanded storage capacity of the gas container 17, the pressure in the space 7 will continue to be maintained at a higher pressure than the outside, so that no external contaminated air will enter into the space γ.

In addition, even if a gap leak occurs in the outer tight band 5, the gas container 17
Similarly, if the leakage is less than the expanded storage capacity, external contaminated air will not enter.

In addition, in FIG. 5, the gas container 17 is placed below the outer tight band 5.
Although the constant pressure exhaust valve 18 is provided above, the present invention is not limited to this. For example, the gas container 17 and the constant pressure exhaust valve 18
It is also possible to have a structure in which they are integrated into one body, directly connected to the exhaust valve 8, and a ventilation pipe is provided from there to guide the exhaust gas into the space 7.

Further, the constant pressure exhaust valve 18 may be replaced by a small diameter outlet, or the outer tight band 5 may be made of a sponge having fine holes.

However, the hole diameters of these small-diameter outlets and micropores are within a range where the above-mentioned mask function is not affected by the ventilation amount (in other words, when exhausting by lung force, the exhaust pressure is
It must be small within a range that allows for sufficient expansion of the gas and that the pressure in the space 7 does not drop suddenly when the supply of exhaust gas is stopped.

Since this invention is constructed as described above, it is cheaper and more convenient to carry than the conventional blower type, and it also reduces the risk of external contaminated air leaking in compared to the filter direct connection type. Can be reduced to a large width,
Very informative.

Although the present invention has so far described only the case where the outer tight band 5 is configured to cover the JiLJL and the mouth, the outer tight band 5 may also be provided only in particularly dangerous areas, such as the tip of the nose. If it is necessary to protect the eyes, it may be combined with glasses to cover the entire face.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the mask of the present invention attached to the face. Figure 2 is a front sectional view of the mask portion, and Figure 3 is a sectional view of the mask attached to the face and viewed from the side. FIG. 4 is a sectional view showing the structure of the intake valve. Fig. 5a is a front sectional view showing another embodiment of the mask of the present invention, and Fig. 5 is a sectional view when attached to the face and seen from the side. 1 is an inner tight band, 7 is a space, 8 is an exhaust valve, 9 is a discharge port, 10 is an intake valve, 11 is an inside of the mask, 17 is a gas container, and 18 is a constant pressure exhaust valve.

Claims (1)

[Scope of Claims] 1. A face tight band having a double structure of an outer tight band and an inner tight band, a space formed by the double structure, and a filter case communication portion provided in the inner tight band. It consists of an intake valve, an exhaust valve provided from the inner tight band toward the space, and a discharge port or constant pressure exhaust valve provided in the outer tight band, and once guides exhaust gas into the space. A mask for preventing the intrusion of external contaminated air, which is characterized by being designed to be released later. 2. A face tight band having a double structure of an outer tight band and an inner tight band, a space formed by the double structure, and a filter case connection of the inner tight band. an intake valve provided in the continuous section; an exhaust valve provided from the inner tight band toward the space; a gas container that is continuous with the space and whose volume is variable in conjunction with the pressure within the space;
A mask for preventing intrusion of external contaminated air, comprising a constant pressure exhaust valve or a discharge port provided in the outer tight band, and the exhaust gas is once introduced into the space and the gas container and then released.