JP2024036864A - Virus infection prevention device - Google Patents

Abstract

The present invention provides a virus infection prevention device that effectively prevents virus infection. [Solution] A mouth part, an air cleaning part that irradiates the taken in air with ultraviolet rays, supplies the air irradiated with the ultraviolet rays to the mouth part, or discharges the air irradiated with the ultraviolet rays into the air; A virus infection prevention device comprising an air supply hose that communicates between a mouth part and an air cleaning part, the air cleaning part having a cylindrical shape having a connection port for the air supply hose at each of one end and the other end. a body, an air supply fan that takes air into the cylindrical body and exhausts air irradiated with ultraviolet rays from within the cylindrical body, and an ultraviolet light emitting diode that irradiates the air taken into the cylindrical body with ultraviolet rays. , a reflecting plate provided between the air supply fan and the ultraviolet light emitting diode and reflecting ultraviolet light emitted from the ultraviolet light emitting diode, and the reflecting plate adjusts the distribution angle of the ultraviolet light emitted from the ultraviolet light emitting diode. It has a substantially matching inclined surface. [Selection diagram] Figure 2

Description

The present invention continuously supplies the user with clean air in which viruses are inactivated, or if the user is infected with the virus, the virus-containing air (exhaled breath) exhaled by the infected person The present invention relates to a virus infection prevention device that can discharge the virus into the air in an inactivated state.

In recent years, new viruses such as the coronavirus have continued to spread worldwide, and governments around the world are making strenuous efforts to prevent the spread of infection.
The virus is approximately 0.1 μm in size, continues to multiply within the body of an infected person, and is contained in exhaled droplets (sizes of several μm to tens of μm) and saliva (size of several tens of μm) and is released into the air. released inside. Microparticles such as pollen, dust, and loess are suspended in the air, and these microparticles are collected and removed through filters to obtain clean air on a daily basis.

For example, air purifiers with built-in filters are used to purify indoor air. In the filter of an air purifier, by making the size of the small pores in the filter smaller than the size of microscopic particles, microscopic particles can be captured by the filter and clean air can be released.

Since the filter is used by trapping microparticles in the voids of the filter, the microparticles begin to fill the voids of the filter from the moment the filter is used.

As the voids in the filter decrease with use, the pressure required to force a given amount of air through the filter at a given flow rate gradually increases. Normally, it is not possible to continue using the filter beyond the withstand pressure specified by the filter material, so stop using the filter, replace or clean it to remove accumulated microparticles from the filter, and then start using it again. . In other words, filters are required to have both "high collection efficiency" and "long-term sustainability of collection efficiency." No matter how high the collection efficiency is, a filter that requires frequent replacement will be less practical.

BACKGROUND ART High-performance masks using filters capable of collecting microparticles with a size of about 0.3 μm have been put into practical use. These masks include N95 masks and N95 masks, which were developed to have particularly high collection efficiency for medical workers who are in charge of treating patients infected with bacteria, such as tuberculosis bacteria, which are approximately 1 μm in size. Surgical masks are known.

BACKGROUND ART In recent years, technology for producing nonwoven fabrics made by directly shaping thin fibers into cloth shapes has been developed, and "nonwoven fabric masks" made from such nonwoven fabrics are also widely known (Patent Document 1).
Non-woven fabric masks with a microparticle collection efficiency of over 95% are being mass-produced at low cost. In response to the recent spread of the new coronavirus, the World Health Organization (WHO) is encouraging people around the world to wear masks. Even in Japan, many people wear masks when going out and go about their business while wearing masks.

By the way, if masks such as non-woven fabric masks that are touted to have high droplet collection efficiency can literally collect droplets with high efficiency, then if the exhaled air volume is about 450 cc and the humidity is about 95%. After about an hour has passed since the mask was worn, the mask will become damp and soaked with water.

However, in reality, even if you pick up a mask that has been worn all day, it will not feel damp. This is an extremely strange phenomenon, so we investigated it.

<Collection of microparticles using a filter>
"Filter" means a filtration device. For example, this filter is used to collect minute particles such as dust in the air, and the dust is retained in the filter, while the air is allowed to pass through the filter. The removed clean air can be supplied outside the filter.

As shown in FIG. 8, microparticles 102 with a size larger than the voids 110 provided in the filter 100 are collected by the filter 100, while microparticles 102 with a size smaller than the voids 110 remain in the voids of the filter 100. It passes through 110.

When the microparticles 102 clog the voids 110 of the filter 100, the space through which air can pass becomes narrower, so the pressure required for a certain amount of air to pass through the filter 100 at a determined flow rate is enough to collect the microparticles 102. The pressure gradually increases as the pressure increases, and the pressure difference between the pressure on the left side of the filter 100 and the pressure on the right side after passing through the filter 100 increases.

When actually specifying the performance of the filter 100, we consider the efficiency with which the filter 100 can capture microparticles 102 and the pressure difference (differential pressure) before and after the filter 100 required to maintain a certain flow rate of a certain amount of air. ) should be specified.

In FIG. 8 , microparticles 102 smaller in size than the voids 110 of the filter 100 pass through the filter 100 . Therefore, in order to increase the collection efficiency, if the voids 110 of the filter 100 are made smaller, the collection efficiency will increase. becomes high immediately. Therefore, it is necessary to frequently replace the filter 100 in a short period of time.

Therefore, the size of the void 110 is optimally determined in consideration of both the collection efficiency and the length of usable period. Depending on the usage environment, a plurality of filters 100 may be used, and a filter for coarse particles and a filter for fine particles may be arranged separately to reduce the frequency of overall replacement.

By the way, the microparticles 102 shown in FIG. 8 are solid microparticles, and the situation is different when they are droplets (aerosol), which are small water droplets contained in exhaled breath.
FIG. 9 is a conceptual diagram when the filter 100 attempts to collect droplets 104 from left to right. The size of the void 110 of the filter 100 shown in FIG. 9 is about 0.3 μm to 1.5 μm. The size of the droplets 104 and saliva 106 is from several μm to several tens of μm, which is sufficiently larger than the void 110 of the filter 100, so that they are originally large enough to be collected by the filter 100, but these droplets 104 and saliva If the particles 106 are deformed by the wind pressure of exhalation, they will pass through the gaps 110 of the filter 100 and will not be collected by the filter 100.

When the saliva 106 is released from the filter 100, it is changed into small droplets 104 according to the size of the void 110 of the filter 100, and is released as many droplets 104.
That is, since the droplets 104 are water droplets, they deform when subjected to slight wind pressure and slip through the gaps 110 of the filter 100. The maximum wind pressure of a healthy person's exhalation is about 9,000 Pa to 10,000 Pa. Under this wind pressure, not only the droplets 104 but also the larger saliva 106 pass through the air gap 110 and become small size droplets 104 and are released from the air gap 110 of the filter 100.

If the virus 108 is contained in the droplets 104 or saliva 106, the virus 108 will be released to the outside of the filter 100 through the air gap 110. In other words, in order to use a filter to collect water droplets or saliva, the air pressure must be extremely low, and droplets cannot be collected under the wind pressure of a healthy person's exhalation. Therefore, it is understandable that even after several hours have passed after wearing a mask, which is a type of filter, the area around the mouth of the mask remains dry, and droplets are not collected.

<Importance of saturation time in collecting microparticles using a filter>
FIG. 10 is a schematic diagram showing how the filter 100 collects microparticles 102 in the air.

When the microparticles 102 are collected by the filter 100, the microparticles 102 fill the voids 110 of the filter 100, so the voids 110 of the filter 100 unilaterally decrease, allowing a certain amount of air to pass through the voids 110 at a predetermined flow rate. The pressure required to achieve this (differential pressure) increases.

Generally, in the filter 100, the voids 110 start filling up from the moment the object substance starts to be collected, so the pressure (differential pressure) necessary for the substance to pass through the filter 100 increases. Therefore, when the pressure (differential pressure) required to pass through the gap 110 reaches a specified value, the filter 100 is said to be "saturated" and the filter 100 must be replaced with a new one, or the filter 100 must be cleaned and replaced. You cannot continue using the product unless it is returned to its original state.

Therefore, a product that simply increases the collection efficiency of the filter 100 will take less time to reach "saturation" and will require complicated replacement of the filter 100, making the product difficult to use practically. obtain. If the collection efficiency of the filter 100 is lowered, the time until "saturation" will be longer, but the number of microparticles 102 that will pass through will increase. A practical filter 100 is one that is optimized for collection efficiency and time to "saturation."

Even if you try to collect droplets in exhaled breath with a non-woven fabric mask, the droplets are water droplets and will deform under the wind pressure of exhaled air and are likely to slip through the non-woven fabric mask, so use a non-woven fabric mask to collect droplets in exhaled breath. Although this is difficult in principle, we have calculated the saturation time assuming that droplets can be collected with a non-woven mask.

Commercially available non-woven masks generally have a three-layer structure: a filter layer in the middle, a soft layer around the mouth, and a hard layer on the outside that collects dust. It is about 10 cm tall and wide, but since it is folded up and down near the center, it is about 15 cm tall and 15 cm wide when unfolded. The total thickness is about 0.3 mm.

The volume of a nonwoven fabric mask of such size is 6.75 cc. Assuming that the volume occupancy of the fibers constituting the nonwoven mask is 15%, the space is 5.74 cc.
It is known that an adult breathes about 15 times per minute, and the volume of one exhalation is about 400cc to 500cc, so the median value of 450cc is used as the trial calculation for the volume of one exhalation.

The temperature of exhaled air is 36.5°C, and the amount of saturated water vapor at this temperature is 44 g/m ³ , so it is 0.0198 g/450 cc. Since the humidity of exhaled breath is 95%, the moisture content is 0.0188g.If we repeat breathing 15 times per minute, the moisture content in exhaled breath is 0.282g/min, which is 406.08g in 24 hours. Become.

Other estimates suggest that adults exhale about 400g of water in their breath every 24 hours a day. This amount approximately matches the above-mentioned estimated value (406.08 g for 24 hours).
Similarly, the saturated water vapor amount at an intake air temperature of 25°C is 22.5 g/m ³ , so the amount of intake air per breath is 0.010 g/450 cc, and if the humidity is 50%, it is 0.005 g/450 cc, which means 15 breaths per minute. If repeated, the amount of moisture in the inhaled air will be 0.075 g/min.

The sum of exhaled air and inhaled air is 0.357 g/min, and if 95% of this is collected, 0.34 g/min (20.4 g/h) of moisture is collected.
In fact, wearing a non-woven fabric mask that is said to have a droplet collection efficiency of over 95% while maintaining close contact with the face can make it quite difficult to breathe. Therefore, assuming that about half of the 5.74 cc of space in the non-woven fabric mask is left, and calculating the time required to completely fill the remaining 2.87 cc of space with moisture, if the weight of 1 cc of moisture is 1 g, then 8. .44 minutes.

Even if we assume that non-woven masks have the effect of collecting droplets, we would have to replace them with new ones every 10 minutes after wearing them, which makes non-woven masks less practical. it is obvious.

<Mask wearing test>
If the non-woven fabric mask continues to collect droplets, moisture should accumulate in the non-woven fabric mask every moment. Therefore, if you measure the weight of the non-woven fabric mask before wearing it, and then measure the weight of the non-woven fabric mask 20 minutes, 1 hour, 2 hours, and 3 hours after wearing it, the amount of water collected and accumulated in the non-woven fabric mask can be measured. Since the weight of the water collected can be determined, it is possible to check how the collection efficiency changes over time.

Table 1 shows the results of having volunteers wear commercially available non-woven masks and measuring changes in the weight of the non-woven masks while performing normal work in this condition.

According to the estimated value of the droplet collection efficiency of the non-woven fabric mask mentioned above, after wearing the non-woven fabric mask, the weight increases by 20.4 g after 1 hour, 40.8 g after 2 hours, and 61.2 g after 3 hours. They should have done so.

However, as shown in Table 1, the weight actually increased by only a few milligrams to several tens of milligrams, which is less than 0.1% of the estimated value.
The results shown in Table 1 show that even if you try to collect droplets by wearing a commercially available high-quality non-woven mask with a droplet collection efficiency of over 95%, most of the droplets from both exhaled and inhaled air will pass through the non-woven mask. However, it has been made clear that it does not have the function of collecting droplets.

In addition, the users of non-woven masks were carrying out their normal work, including answering the phone and talking with others, so even though there was saliva associated with this. , the weight of non-woven masks has not increased.

In order to confirm this, we sprayed about 1 g of water in the form of a mist near the mouth of the non-woven fabric mask in advance, and after wearing it for 30 minutes, we measured the weight change of the non-woven fabric mask, and found that most of the moisture remained in the non-woven fabric mask. This was the result.

Even if the humidity of inhaled air is about 50%, the humidity of exhaled air is 95%, and assuming that droplets are constantly collected by the non-woven mask as a result of breathing, this weight loss cannot be explained by the theory of dryness. Also, if it were to evaporate, the droplets would not have been captured by the mask.

In other words, it has been demonstrated that most of the moisture in non-woven masks, whether it is droplets or saliva, is released outside the non-woven mask as droplets under the wind pressure of a healthy person's exhalation.
Although it was found that droplets, which are small water droplets, cannot be collected by filters, we investigated the possibility that if the droplets contain bacteria or viruses, these bacteria or viruses could be collected by masks.

Staphylococcus and Escherichia coli are known to be common bacteria. Other types of bacteria that are known include Mycobacterium tuberculosis, Mycobacterium shigella, and Vibrio cholerae, but the sizes of these bacteria vary, with some having a spherical shape and others having an elongated rod shape. It is said that the diameter is about 1 μm.

In principle, it is possible to collect bacteria with a size of about 1 μm using a nonwoven fabric mask with a gap of about 0.3 μm. Even if bacteria act together with droplets contained in exhaled or inhaled air, the droplets will pass through the gaps in the mask, but bacteria cannot pass through the gaps, so we judge that there is a high possibility that bacteria can be collected. can.

On the other hand, the shape and size of viruses are not constant, but they are said to be approximately 0.1 μm in size. In principle, it is impossible to collect a virus of this size with a nonwoven mask with a gap size of about 0.3 μm. Viruses act together with droplets, which are water droplets, so it is correct to think that the virus can be collected by collecting droplets, but unfortunately, droplets are liquid and when exposed to the wind pressure of exhaled air, they deform and become unusable in masks. As the droplets pass through the gaps, the virus also passes through the gaps, and as a result, the virus cannot be collected by the mask.

<Study of JIS T9001>
In June 2021, the Ministry of Economy, Trade and Industry standardized the performance and testing methods of masks, so that people who need them can purchase them with peace of mind. JIS T9001 (Performance requirements and test methods for medical and general masks) was established for medical and general masks. Table 2 shows an excerpt of the main parts.

In addition, JIS T9002 (performance requirements and testing methods for medical masks for infection control) was established for masks for medical workers engaged in coronavirus infection control.
This regulation stipulates testing methods for masks in four categories: for collecting microparticles, for collecting bacteria droplets, for collecting virus droplets, and for collecting pollen particles.

In the microparticle collection efficiency test, as microparticles, true spherical polystyrene standard particles with a nominal particle size of 0.1 μm were dispersed in pure water, or true spherical polystyrene standard particles with a nominal particle size of 0.3 μm were dispersed in pure water. It is said that it is also possible to use a material dispersed in

Adjust the number of particles to 10 ⁷ to 10 ⁸ per 1 m ³ with an aerosol generator, flow it into the chamber, count the number with a particle counter, and collect based on the ratio of the number before passing through the mask and after passing through the mask. Calculating efficiency.

JIS T9001 stipulates a test method using a microparticle collection efficiency test device 200 schematically shown in FIG. 11. The reason why this device measures the differential pressure is because as collection progresses, the gap in the mask becomes clogged and decreases, and if suction is attempted at a constant flow rate, the differential pressure increases. A higher differential pressure means that wearing a mask will make it more difficult to breathe. In FIG. 11, reference numeral 202 is compressed air containing aerosol, 204 is a differential pressure gauge, 206 is a bellows, 208 is a particle counter, 210 is a glass chamber, 212 is a constant flow suction pump, and 214 is a sample.

In the bacterial droplet collection efficiency test, a bacterial droplet collection efficiency test device 220 as shown in FIG. 12 is used to flow droplets 224 containing bacteria, and the efficiency of collection by the mask is measured. Bacteria grow on the agar medium 236, so mold grows in a circular shape. The areas where this mold grows are called "colonies," and the collection efficiency is calculated by counting the number of colonies.

Droplets cannot be captured by a mask, but bacteria are larger than the gaps in the mask, so there is a high possibility that they can be captured. In FIG. 12, reference numeral 222 is compressed air, 226 is a glass chamber, 228 is a sample, 230 is a bellows, 232 is an Andersen sampler, 234 is a cascade impactor, 238 is a petri dish, and 240 is a constant flow suction pump.

In the virus droplet collection efficiency test, droplets containing virus-infected E. coli are passed through the virus droplet collection efficiency testing device 220, and the number of E. coli bacteria is counted before and after being collected by a mask. In this case, the E. coli infected with the virus dies in a process called lysis, and if the infection spreads to surrounding healthy E. coli, it becomes possible to observe open spaces free of mold. These are called "plaques" and the collection efficiency is calculated by counting the number of plaques.

Therefore, the test is conducted in the same manner using the same device as the bacterial droplet collection efficiency test device 220 shown in FIG. 12. The difference is that the bacterial droplet collection efficiency test counts the number of bacteria that have grown, whereas the virus droplet collection efficiency test counts the number of locations where bacteria were infected with the virus and died.

There are some fundamental points in the testing method prescribed here that are difficult to understand. This partially leads to the bacterial droplet collection efficiency test, as described in (1) to (3) below.

(1) Are you trying to measure the efficiency with which a mask collects droplets, which are water droplets?
However, the specified bacterial suspension is not pure water and contains additives, so its physical properties are different from the water contained in exhaled breath.
If you want to measure the efficiency of collecting droplets, separate tests should be conducted to distinguish between bacterial droplet collection and virus droplet collection, since the effect of size is limited regardless of whether bacteria are contained or not. There seems to be no need to do so. If the collection efficiency of droplets is to be measured, it should be possible to efficiently measure the change in weight of the mask using a device similar to the pollen collection efficiency test device 242 shown in FIG. 13. In addition, in FIG. 13, the reference numeral 244 is pollen-containing air, 246 is a sample, and 248 is a constant flow suction pump.

(2) Are you trying to measure the efficiency of capturing bacteria contained in droplets rather than droplets (water droplets)?
Staphylococcus is used in the bacterial droplet collection efficiency test, and E. coli contaminated with a virus is used in the virus droplet collection efficiency test. However, since the size of viruses is one order of magnitude smaller than bacteria, there seems to be no need to separately measure the collection efficiency of Staphylococcus and E. coli.

(3) Are you trying to catch the virus with a non-woven mask?
If this is the case, it would be theoretically impossible for a non-woven mask to efficiently capture viruses due to its size.
If droplets containing virus-contaminated E. coli are actually sent out to determine the proportion of E. coli contaminated with viruses, the measurement result is the E. coli collection efficiency and has nothing to do with virus collection.

In fact, there are non-woven masks on the market that have been shown to have a viral droplet collection efficiency of 95% or more. The prescribed method measures the effectiveness of a mask in capturing droplets containing E. coli infected with the virus. In this method, the droplets are deformed and released from the gaps in the mask, but since the size of E. coli is approximately 1 μm, they are collected by the non-woven mask. Therefore, the method for measuring virus droplet collection efficiency specified in JIS T9001 is actually a method for measuring the collection efficiency of E. coli, and there is nothing unnatural even if the collection efficiency is actually measured to be 95% or more. Not so. Therefore, in terms of virus droplet collection efficiency, it is impossible to collect both droplets and viruses with a nonwoven fabric mask, and the collection efficiency should be zero.

Patent No. 6143972

In the droplet collection efficiency test device 220 shown in FIG. 12, droplets 224 containing bacteria are specified to move at 28.3 L/min in a glass chamber 226 with an inner diameter of 80 mm together with compressed air 222. . As mentioned above, the amount of exhaled air for an adult is approximately 450 cc, and approximately 900 cc passes through the mask when exhaled and inhaled.

If the number of breaths is 15 times/min, 13.5 L/min of droplets 224 will pass through. This value is just an average value, and if a higher value is specified in consideration of safety, the above flow rate of 28.3 L/min can be said to be appropriate.

A major problem with the JIS T9001 regulations is that the experimental method using the droplet collection efficiency test device 220 shown in FIG. 12 does not clearly specify the time required to saturate the filter. The time it takes for the filter to reach saturation is an extremely important factor that affects its practicality, and it is necessary to actually measure it to clearly indicate when it should be replaced.

Specifically, after installing a filter in the droplet collection efficiency test device 220 shown in FIG. 12, droplets 224 containing bacteria or droplets containing viruses are continuously flowed, and when 1 hour has elapsed in the middle, and when 5 hours have elapsed. If the collection efficiency is measured after 10 hours have elapsed, a collection efficiency that matches the actual manner in which the mask is worn can be obtained, and based on this, it is possible to clearly indicate when it is time to replace the mask.

From this change in collection efficiency over time, for example, if the collection efficiency needs to be at least 80%, you can know how much time has passed to reach this efficiency, so you can wear the mask before replacing it with a new one. This means that the predicted saturation time will be clearly indicated. The mask should clearly indicate this "saturation time" along with its "capture efficiency."

The time required for the gap in the mask to be reduced by half with use, as determined from the above-mentioned trial calculation results, is within 10 minutes. The time that a collection efficiency of 95% or more can be maintained is less than 2 minutes after wearing.

As described above, the test conditions for the system that measures the collection efficiency of masks reflect the conditions required when a mask is actually worn to collect droplets containing bacteria or viruses. It is something that has not been done.

Although this is a product that has passed JIS (Japanese Industrial Standards) and is a non-woven fabric mask that is supposed to have a droplet collection efficiency of over 95%, when we actually put it on, it hardly collected any droplets. This is an explanation of the facts that have not been collected.

In other words, it is impossible in principle and in practice to collect droplets and saliva, which are liquids, using a mask, which is a type of filter. Even for masks that are said to have a collection efficiency of 98% or more, such as N95 masks and surgical masks for medical workers, solid sodium chloride powder is used to measure the collection efficiency, and the obtained The biggest problem is that the results can be applied directly to collecting droplets and saliva, which are liquids.

As I have repeatedly stated, it is a mistake to apply the function of collecting solid particles to the collection of droplets, which are liquid particles, and N95 masks and surgical masks for medical workers are only designed to collect solid particles such as dust. The ability to collect droplets and saliva, which are fine liquid particles, has not been demonstrated. However, since the size of bacteria is approximately 1 μm, it seems possible to use these N95 masks and surgical masks to collect bacteria such as tuberculosis bacteria.

Therefore, it goes without saying that there is no basis for the claim that N95 masks can protect medical workers who treat people infected with the coronavirus from infection.
Furthermore, even if we were able to manufacture a mask that has a high droplet collection effect even under the wind pressure of exhalation by using some kind of device to the filter, such as a function that can collect droplets using static electricity, the duration of the collection effect will be limited. In principle, it is within 10 minutes at most.

No matter what type of mask you use, as long as it uses a filter, it is virtually difficult to protect the user from virus infection. Currently, N95 and other masks are the main equipment that protects medical workers who are engaged in treating virus-infected patients from infection, but if masks do not have the ability to collect droplets, medical personnel The development of new virus infection prevention devices that protect people from virus infection is an urgent social need.

Furthermore, since conventional medical masks completely cover the mouth, they must be removed when eating or drinking, leaving the person unprotected. Furthermore, there were major drawbacks for people with hearing loss, such as the inability to lip read.

On the other hand, it has been known that viruses can be inactivated by irradiation with ultraviolet rays, and various types of air purification devices are commercially available and in practical use. Commercially available devices include devices that purify the air in an entire large room and small desktop devices. Regarding ultraviolet generators, there are also known devices that use ultraviolet lamps or ultraviolet light-emitting diodes.

In the method of using an ultraviolet lamp, a high-output lamp can be used at a relatively low cost, but the drawback is that it may generate ozone. On the other hand, the system using ultraviolet light emitting diodes can be made smaller and lighter, but has the drawback of high cost of high output ultraviolet light emitting diodes.

In recent years, ultraviolet light emitting diodes have become higher in output and lower in price, making it possible to manufacture high-performance air purifying devices at low cost. However, as shown in FIG. 14(a), the distribution of ultraviolet light emitted from the ultraviolet light emitting diode 300 (ultraviolet light distribution area 302) has a unique shape, which is shown in FIG. 14(b). As shown, in the conventional device which is placed inside the cylindrical body 310 and irradiates the air inside the cylindrical body 310 with ultraviolet rays to inactivate the virus, the density of ultraviolet rays is low. In some cases, the air could not flow directly above the ultraviolet light emitting diode 300, which has the highest UV rays, and the virus could not be inactivated with high efficiency. In FIG. 14, reference numeral 304 is a substrate, 306 is a base plate, and 308 is an air passage hole.

In view of the current situation, it is an object of the present invention to provide a virus infection prevention device that can effectively prevent virus infection for many people, including medical workers, in place of masks such as non-woven masks. shall be.

Furthermore, it is an object of the present invention to provide an extremely safe virus infection prevention device that can continue to supply safe air even while the user is eating and drinking, and is considerate of people with hearing loss.
Another object of the present invention is to provide a virus infection prevention device that can highly efficiently inactivate viruses in virus-containing breath released into the air by a virus-infected person.

The present invention was invented in order to solve the problems in the prior art described above, and the present inventor has invented an air cleaning section having a shape that matches the shape of the light distribution of ultraviolet light emitting diodes, and has achieved high efficiency. We have invented a virus infection prevention device that can be easily and inexpensively carried by individuals.

Specifically, the virus infection prevention device of the present invention includes:
a mouth part arranged around the user's mouth;
an air cleaning unit that takes air into the interior, irradiates the taken in air with ultraviolet rays, supplies the air irradiated with the ultraviolet rays to the mouth, or discharges the air irradiated with the ultraviolet rays into the air; and,
an air supply hose that communicates the mouth part and the air cleaning part;
A virus infection prevention device comprising at least the following:
The air cleaning section
a cylindrical body having a connection port for an air supply hose at each of one end and the other end;
An air supply provided further inward than a connection port on one end side of the cylindrical body, for taking in the air into the cylindrical body and discharging the air irradiated with the ultraviolet rays from inside the cylindrical body. with fans,
an ultraviolet light emitting diode that is provided further inward than the connection port on the other end side of the cylindrical body and irradiates the air taken into the cylindrical body with ultraviolet rays;
a reflector plate provided between the air supply fan and the ultraviolet light emitting diode and reflecting ultraviolet light emitted from the ultraviolet light emitting diode;
has
The reflector is characterized in that it has an inclined surface that substantially matches the distribution angle of the ultraviolet light emitted from the ultraviolet light emitting diode.

With this configuration, viruses contained in the air can be inactivated with high efficiency using the ultraviolet rays emitted from the ultraviolet light emitting diode, and this inactivated air can be used by the user. Can be supplied to the mouth.

In addition, by changing the connection position of the cylindrical body and the air supply hose, this virus infection prevention device inactivates the air (exhaled breath) exhaled by the virus infected person when worn by a virus infected person. Can be vented into the air.

Furthermore, an ultraviolet light emitting diode has a fixed output wavelength, is safe without the risk of ozone generation due to emission, and is easy to obtain, which can contribute to reducing manufacturing costs.

In addition, if a reflective plate is provided in this way, the air taken into the air cleaning unit can be irradiated with ultraviolet rays without leaking, and viruses in the air or exhaled breath can be reliably inactivated. can.

Furthermore, if the reflecting plate has an inclined surface that substantially matches the light distribution angle of the ultraviolet light emitting diode, the air taken into the air cleaning section can be efficiently irradiated with ultraviolet rays.

Furthermore, the virus infection prevention device of the present invention includes:
The reflective plate is
A plate-like body,
and an ultraviolet reflection film formed on the surface of the plate-like body.

With this configuration, the ultraviolet reflecting film can be reliably formed no matter what shape the plate-like body has. Therefore, viruses in the air or exhaled breath can be reliably inactivated.

Furthermore, the virus infection prevention device of the present invention includes:
A light distribution lens is provided on the emission side surface of the ultraviolet light emitting diode from which the ultraviolet rays are emitted,
The light distribution angle of the ultraviolet rays is adjusted by the light distribution lens.

By using the light distribution lens in this manner, the light distribution angle of the ultraviolet light emitting diode can be adjusted to a desired light distribution angle, so that the air taken into the air cleaning unit can be efficiently irradiated with ultraviolet rays.

Furthermore, the virus infection prevention device of the present invention includes:
A distribution angle of the ultraviolet light emitted from the ultraviolet light emitting diode is within a range of 25 degrees to 140 degrees.

In particular, with such a light distribution angle, the air taken into the air cleaning section can be efficiently irradiated with ultraviolet rays.

Furthermore, the virus infection prevention device of the present invention includes:
The ultraviolet light emitting diode is disposed on a base plate having a plurality of air passage holes via a substrate,
It is characterized in that the base plate is fixed to an inner surface of the cylindrical body.

If the ultraviolet light-emitting diode is disposed on the base plate having a plurality of air passage holes via the substrate, the ultraviolet light-emitting diode is disposed approximately in the center of the cylindrical body when viewed from the front. can be set. Therefore, the air taken in can be evenly irradiated with ultraviolet rays.

Furthermore, the virus infection prevention device of the present invention includes:
A heat sink is provided on a surface of the base plate opposite to the side on which the ultraviolet light emitting diode is disposed,
The arrangement position of the heat sink is set so that the position of the ultraviolet light emitting diode and the position of the heat sink overlap when the ultraviolet light emitting diode is viewed from above.

With this configuration, the ultraviolet light emitting diode is cooled by the heat sink, so the ultraviolet light emitting diode can be used for a long time, and failure of the ultraviolet light emitting diode can be prevented. .

Furthermore, the virus infection prevention device of the present invention includes:
The ultraviolet light emitting diode eliminates 98% or more of viruses in droplets present in 2000 cc of air taken into the space formed by the reflector in the cylindrical body within 2 seconds or less. It is characterized by having the ability to activate.

An ultraviolet light emitting diode with such performance can reliably inactivate viruses in the air.

Furthermore, the virus infection prevention device of the present invention includes:
The ultraviolet light intensity of the ultraviolet light emitted from the ultraviolet light emitting diode is within the range of 2 mW/cm ² to 500 mW/cm ² .

With such an intensity of ultraviolet rays, it is possible to reliably inactivate viruses in the air or exhaled breath.

Furthermore, the virus infection prevention device of the present invention includes:
The wavelength of the ultraviolet light emitted from the ultraviolet light emitting diode is within the range of 210 nm to 290 nm.

In particular, ultraviolet rays of such wavelengths can highly efficiently and reliably inactivate viruses in the air or exhaled breath.

Furthermore, the virus infection prevention device of the present invention includes:
It is characterized in that the amount of air blown by the air blowing fan is 600 cc or more per second.

With this amount of air, air in which viruses are inactivated is always supplied near the user's mouth, and it is possible to reliably prevent the user from inhaling virus-containing droplets, etc. from the surrounding area. I can do it. Furthermore, when worn by a virus-infected person, the air exhaled from the mouth (exhalation) can be reliably discharged into the air in a state in which the virus is inactivated.

Furthermore, the virus infection prevention device of the present invention includes:
One end of the air supply hose is detachably connected to a connection port provided at the mouth.

If the one end of the air supply hose and the connection port of the mouth are detachably connected in this way, it is possible to improve the ease of maintenance such as attachment/detachment, replacement, repair, and cleaning of the air supply hose.

Furthermore, the virus infection prevention device of the present invention includes:
The other end of the air supply hose is detachably connected to either a connection port on one end side or a connection port on the other end side of the cylindrical body of the air cleaning unit. .

If the other end of the air supply hose is removably connected to either the connection port on the one end side or the connection port on the other end side of the cylindrical body of the air cleaning unit, the main The purpose of the virus infection prevention device of the invention is to supply virus-inactivated air to the user, and when worn by a virus-infected person, to inactivate the virus from the exhaled breath of the virus-infected person. It is very convenient because it can be used for any purpose that eliminates the risk of contaminating the surrounding area.

Furthermore, the virus infection prevention device of the present invention includes:
The mouth part is
It is characterized by being made of a highly transparent resin with a total light transmittance of 80% or more (based on JIS K7105, measured with a 1 mm thick sheet).

If the mouth part is made of highly transparent resin, the user's mouth will not become difficult to see due to the mouth part, and the present invention will be useful for hearing-impaired people who read speech based on the shape and movement of the speaker's mouth. This virus infection prevention device can be used appropriately.

It goes without saying that it is desirable that the surface of such a mouth portion be provided with an anti-fog function.

Furthermore, the virus infection prevention device of the present invention includes:
It is characterized in that the mouth part is configured in a funnel shape.

The funnel-shaped mouth portion can reliably supply inert air to the user's mouth.

In addition, the funnel-shaped mouth part is placed around the mouth without covering the mouth, so it does not interfere with eating and allows the mouth to be clearly seen. The virus infection prevention device of the present invention can be suitably used by hearing-impaired people and others who read speech based on words and movements.

Furthermore, the virus infection prevention device of the present invention includes:
The mouth part is configured in the shape of an oxygen mask that covers the user's mouth and nose.
If the mouth part is configured like an oxygen mask in this way, if the user is infected with a virus, the exhaled breath emitted from the mouth or nose of the person infected with the virus will be collected into the air cleaning part, and the virus will be removed. can be inactivated and then released. Note that in the case of a mouth portion configured in the shape of an oxygen mask, it is preferable to include a band that can be attached to the user's head.

Furthermore, the virus infection prevention device of the present invention includes:
The air purifier is characterized by comprising a shoulder harness having a storage section for storing the air cleaning section.

If the air cleaning unit is stored in the storage area of the shoulder harness in this way, the virus infection prevention device can be used while carrying the air cleaning unit on the back, making it easy to carry without having both hands occupied. Ideal for use on infected people.

Furthermore, the virus infection prevention device of the present invention includes:
The shoulder harness is provided with a bridging member that bridges the left and right sides of the shoulder harness,
The mouth portion is provided with a fixture that is fixed to the bridging member.

In this way, if the shoulder harness is provided with a bridging member that bridges the left and right sides of the shoulder harness, and if the mouth part is provided with a fixing device that is fixed to the bridging member, the user can use the temple for glasses or the fixing device for the head. The mouth part can be held at the mouth without using any tools, and the stress caused by wearing it for a long time can be reduced.

According to the present invention, air in which viruses have been inactivated through ultraviolet light from an ultraviolet light emitting diode can be reliably supplied to a user, and if the user is infected with a virus, It is possible to provide a virus infection prevention device that can discharge virus-containing air (exhaled breath) exhaled by a virus-infected person into the air in a state where the virus is inactivated.

FIG. 1(a) is a schematic side view showing the installed state of the virus infection prevention device according to the embodiment of the present invention, and FIG. 1(b) shows the installed state of the virus infection prevention device according to the embodiment of the present invention. It is a schematic front view. FIG. 2 is a schematic diagram of a virus infection prevention device according to an embodiment of the present invention. FIG. 3(a) is a cross-sectional view of the ultraviolet light emitting diode and peripheral members, and FIG. 3(b) is a top view of the ultraviolet light emitting diode and peripheral members. FIG. 4(a) is an explanatory diagram for explaining the light distribution angle of ultraviolet light by an ultraviolet light emitting diode, and FIG. 4(b) is an explanatory diagram for explaining the light distribution angle by the ultraviolet light emitting diode and a reflector. . FIG. 5 is an explanatory diagram for explaining the light distribution lens. FIG. 6(a) is a schematic side view showing how the virus infection prevention device according to another embodiment of the present invention is attached, and FIG. 6(b) is a schematic side view showing the attachment state of the virus infection prevention device according to another embodiment of the present invention. It is a schematic front view showing a state. FIG. 7 is a schematic diagram of a virus infection prevention device according to another embodiment of the present invention. FIG. 8 is a schematic diagram for explaining the relationship between microparticles in the air flowing from the left side to the right side in the pipe and the size of the voids in the filter. FIG. 9 is a schematic diagram showing how droplets and saliva in the air flowing from the left side to the right side are collected by a filter. FIG. 10 is a schematic diagram showing how microparticles in the air flowing from the left side to the right side are collected by a filter. FIG. 11 is a conceptual diagram of a microparticle collection efficiency test device. FIG. 12 is a conceptual diagram of a bacterial droplet collection efficiency test device. FIG. 13 is a conceptual diagram of a pollen particle collection efficiency testing device. FIG. 14 is an explanatory diagram for explaining the light distribution area of ultraviolet light emitted from the ultraviolet light emitting diode.

Hereinafter, the virus infection prevention device of the present invention will be explained in more detail based on the drawings.
The virus infection prevention device of the present invention can effectively prevent virus infection for many people, including medical workers, in place of masks such as non-woven masks, and can also prevent virus-infected people from being discharged. It is capable of expelling virus-containing air (exhaled breath) into the air with the virus inactivated.

<Virus infection prevention device 80>
As shown in FIGS. 1(a), 1(b), and 2, a virus infection prevention device 80 according to an embodiment of the present invention includes a mouth portion 10 disposed near the mouth of a user 30, and an internal portion. an air cleaning section 50 that takes in air and irradiates the taken air with ultraviolet rays, supplies the ultraviolet irradiated air to the mouth section 10, or discharges the ultraviolet irradiated air into the air; It has an air supply hose 40 that communicates the mouth part 10 and the air cleaning part 50.

The air washing section 50 includes a cylindrical body 52, and has connection ports 68, 56 with the air supply hose 40 at one end A and the other end B of the cylindrical body 52, respectively.
Here, one end of the air supply hose 40 is detachably connected to the connection port 14 provided in the mouth 10, and the other end of the air supply hose 40 is one end of the cylindrical body 52 of the air cleaning section 50. It is configured to be detachably connected to the connection port 68 on the part A side.

Further, the cylindrical body 52 takes air into the cylindrical body 52 further inward from the connection port 68 on the one end A side of the cylindrical body 52, and irradiates ultraviolet rays from within the cylindrical body 52. An air blowing fan 54 is provided to exhaust the air.

On the other hand, further inward from the connection port 56 on the other end B side of the cylindrical body 52 is provided an ultraviolet light emitting diode 58 that irradiates the air taken into the cylindrical body 52 with ultraviolet rays. .
The size of such a cylindrical body 52 is not particularly limited, but for example, the diameter is within the range of 50 mm to 200 mm, the total length is within the range of 100 mm to 300 mm, and the space of about 500 cc to 2500 cc is It is preferable to have.

In addition, in the virus infection prevention device 80 in this embodiment, at least the air supply fan 54 and the ultraviolet light emitting diode 58 can be turned on and off, and the output value can be adjusted or changed by operating the operation switch 22. It is preferable to use the battery 24 as the power source.
In order to make the operation easier, it is possible to control the ON/OFF switching of the power of the air supply fan 54 and the ultraviolet light emitting diode 58, as well as the adjustment and change of the output value, etc., all at once using a wireless controller (not shown). It is okay to do so.

Further, in the virus infection prevention device 80 according to the present embodiment, the ultraviolet light emitting diodes 58 are provided in a plurality of locations (four locations in FIG. 3(b)), as shown in FIGS. 2, 3(a), and 3(b). It is disposed via a substrate 59 on a base plate 63 having an air passage hole 62, and the substrate 59 is fixed to the base plate 63 with solder.

The base plate 63 is fixed to the inner surface of the cylindrical body 52 by means of adhesive or the like.
On the other hand, a heat sink 60 is provided on the surface of the base plate 63 opposite to the side on which the ultraviolet light emitting diode 58 is disposed, so that the ultraviolet light emitting diode 58 emits ultraviolet light when viewed from above (FIG. 3(b)). The heat sink 60 is arranged so that the position of the diode 58 and the position of the heat sink 60 overlap. As the heat sink 60, it is preferable to use, for example, a known commercial product. Such a heat sink 60 is fixed to a base plate 63 with an adhesive.

Here, the performance of the ultraviolet light emitting diode 58 is as follows: 98% or more of the viruses in the droplets present in the 2000 cc of air taken into the space formed by the reflection plate 66 in the cylindrical body 52, which will be described later. It is preferable to have the ability to inactivate in 2 seconds or less, more preferably 1 second or less.

Specifically, the intensity of the ultraviolet light emitted from the ultraviolet light emitting diode 58 is preferably within the range of 2 mW/cm ² to 500 mW/cm ² , more preferably within the range of 20 mW/cm ² to 200 mW/cm ² .

Further, the wavelength of the ultraviolet light emitted from the ultraviolet light emitting diode 58 is preferably within the range of 210 nm to 290 nm.
Here, the ultraviolet light emitting diode 58 has an area (UV light distribution area 74) in which the irradiation range of the ultraviolet light emitted from the ultraviolet light emitting diode 58 has a predetermined angle (wide angle), as shown in FIG. 4(a). is preferred. This angle, ie, the light distribution angle θ, is preferably within the range of 25 degrees to 140 degrees.

Note that if the ultraviolet light emitted from the ultraviolet light emitting diode 58 does not have a predetermined light distribution angle θ, as shown in FIG. By arranging the optical lens 64, it becomes possible to obtain a desired light distribution angle θ.

On the other hand, as shown in FIG. 2 and FIG. 4(b), in the cylindrical body 52 of the air cleaning unit 50, between the air supply fan 54 and the ultraviolet light emitting diode 58, there is a tube for emitting ultraviolet light from the ultraviolet light emitting diode 58. A reflecting plate 66 is provided to reflect the ultraviolet rays. Such a reflecting plate 66 can be created by processing a known cylindrical reflecting mirror, for example. The structure of the reflection plate 66 may be such that an ultraviolet reflection film is formed on the surface of a plate-shaped body (not shown). Further, the material of the ultraviolet reflection film is not particularly limited, but the reflection plate 66 can be formed by forming a film of aluminum on the surface of a plate-shaped body (not shown), for example.

It is preferable that such a reflecting plate 66 is provided with an inclined surface 70 that substantially matches the light distribution angle θ of the ultraviolet light emitted from the ultraviolet light emitting diode 58 described above.
By providing the reflecting plate 66 provided with such an inclined surface 70 in the cylindrical body 52, the ultraviolet rays emitted from the ultraviolet light emitting diode 58 are reflected by the reflecting plate 66, and the cylindrical body Ultraviolet rays can be highly efficiently irradiated onto the air taken into the portion 52 without leaking.

In addition, in the virus infection prevention device 80 of this embodiment, it is preferable that the amount of air blown from the air blowing fan 54 is 600 cc or more per second.
If the amount of air supplied from the air supply fan 54 is 600 cc or more per second, a sufficient amount of virus-inactivated air will always be supplied to the vicinity of the mouth of the user 30 for breathing. , it is possible to reliably prevent inhalation of surrounding virus-containing droplets.

Furthermore, if the amount of air sent from the air supply fan 54 is 600 cc or more per second, even if the user 30 is infected with a virus, every time the virus infected person breathes, all of the exhaled air will be It is possible to exhaust the virus in an inactivated state. Therefore, it is possible to reliably prevent virus-containing droplets from being exhausted around the user 30.

That is, the virus infection prevention device 80 of the present invention has the ability to be applied to both the role of preventing virus infection to users and the role of preventing the spread of infection from virus infected persons.

Here, when supplying virus-inactivated air to the vicinity of the mouth of the user 30, as shown in FIGS. 1(a) and 1(b), a funnel-shaped opening is used. Using the section 10, connect one end of the air supply hose 40 to the connection port 14 of this mouth section 10, and further connect the other end of the air supply hose 40 to the connection port 68 on the one end A side of the air cleaning section 50. , so that the mouth portion 10 is located near the mouth of the user 30.

In this state, by operating the operation switch 22 and operating the air supply fan 54, air is drawn into the cylindrical body 52 from the connection port 56 on the other end B side of the cylindrical body 52. The air received by the ultraviolet rays emitted from the ultraviolet light emitting diode 58 in the space formed by the reflection plate 66 becomes inactivated with viruses, and the air with the viruses inactivated passes through the connection port 68. As a result, the air is supplied to the user's 30's mouth via the air supply hose 40.
In this way, air in which viruses are inactivated can be supplied around the mouth of the user 30, so that the user 30 can live a safe life, and the mouth of the user 30 can be kept close to the mouth part 10. Since it does not block the speaker's mouth, it can be suitably used by, for example, hearing-impaired people who read speech based on the shape and movements of the speaker's mouth. Furthermore, since the mouth of the user 30 is not blocked by the mouth part 10, the user can safely eat and drink while using the virus infection prevention device 80.

On the other hand, when a person infected with a virus uses the virus infection prevention device 80 of this embodiment, first connect the air supply hose 40 to the air cleaning section in the state shown in FIGS. 1(a) and 1(b). 50 from the connection port 68 on the A side, and turn the air cleaning section 50 upside down. Next, as shown in FIGS. 6(a), 6(b), and 7, the air supply hose 40 is connected to the other end B side (upper side in FIG. 6(a)) of the inverted air cleaning unit 50. ) to the connection port 56. Then, the funnel-shaped mouth portion 10 shown in FIGS. 1(a) and 1(b) was removed from the air supply hose 40, and the funnel-shaped mouth portion 10 shown in FIGS. 6(a), 6(b), and 7 was removed instead. A mouth part 10 configured like an oxygen mask that covers the mouth and nose of the user 30 is attached to the end of the air supply hose 40, and a band 26 is attached to the head of the user 30 to prevent the mouth part 10 from moving. Fixed via.

In this state, by operating the air supply fan 54, the exhaust air (exhaled air) of the virus infected person is transferred from the connection port 56 on the other end B side of the cylindrical body 52 to the cylindrical body through the air supply hose 40. The air taken into the body 52 and passed through the plurality of air passing holes 62 receives ultraviolet light emitted from the ultraviolet light emitting diode 58 in the space formed by the reflection plate 66, and viruses in the air are inactivated. The virus-inactivated air is discharged from the connection port 68.

Note that the virus infection prevention device 80 of the present embodiment connects the air cleaning section 50 to the shoulder harness 92, as shown in FIGS. It is preferable that the user 30 carries the air cleaning unit 50 on his or her back. Here, the storage section 94 is preferably configured so that the air cleaning section 50 is firmly held in the storage section 94. For example, the air cleaning section 50 may be configured to fit into the storage section 94, or the air cleaning section 50 may be fixed to the storage section 94 via a band (not shown).
Further, it is preferable that the shoulder harness 92 is provided with a bridging member 96 that bridges the left and right sides of the shoulder harness 92, as shown in FIGS. 1(a) and 1(b). By providing the mouth portion 10 with a fixture 98 that is fixed to the bridging member 96 and fixing it to the bridging member 96, the mouth portion 10 can always be positioned at the correct position near the mouth of the user 30.
Note that the bridging member 96 and the fixture 98 fixed to the bridging member 96 may be omitted as shown in FIGS. 6(a) and 6(b). If there is no such device, it is suitable, for example, when the user 30 (particularly in this case, a virus-infected person) uses the virus infection prevention device 80 while lying on a bed. Furthermore, the user 30 may wear only the mouth part 10, and the air cleaning part 50 stored in the storage part 94 of the shoulder harness 92 may be placed against the edge of the bed.

By providing the shoulder harness 92 and carrying the air cleaning unit 50 on one's back in this way, both hands are not occupied, and this virus infection prevention device 80 can be used particularly by medical workers and virus-infected people. can.

Note that the manner in which the mouth portion 10 is attached to the user 30 is not limited to the forms shown in FIGS. 1(a), 1(b), and 6(a) and 6(b). It's something that doesn't exist. Here, it is preferable that the mouth part 10 be transparent so that it can be easily seen. Specifically, the mouth portion 10 is preferably made of a highly transparent resin having a total light transmittance of 80% or more (based on JIS K7105, measured with a 1 mm thick sheet). Further, it is desirable that the surface of the mouth portion 10 be subjected to an anti-fog treatment.

With the mouth part 10 made of highly transparent resin, the mouth of the user 30 is always visible, so it is suitable for hearing-impaired people who read speech by the shape and movement of the speaker's mouth, for example. It can be used for.

As described above, the virus infection prevention device 80 of the present invention reliably supplies air in which viruses have been inactivated by the ultraviolet rays emitted from the ultraviolet light emitting diode 58 to the mouth of the user 30 via the mouth portion 10. If the user 30 is a virus-infected person, all the breath of the virus-infected person is taken into the air cleaning unit 50, and the virus-containing breath is irradiated with ultraviolet light through the ultraviolet light emitting diode 58. The virus can then be discharged into the air in an inactivated state.

Further, the virus infection prevention device 80 of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the purpose of the present invention.
That is, the user 30 using the virus infection prevention device 80 of the present invention may use the virus infection prevention device 80 while wearing, for example, protective goggles.
Furthermore, the air cleaning unit 50 may be placed directly on a desk, chair, bed, floor, etc. without using the shoulder harness 92.

10 Mouth 14 Connection port 22 Operation switch 24 Battery 26 Band 30 User 40 Air supply hose 50 Air cleaning section 52 Cylindrical body 54 Air supply fan 56 Connection port 58 Ultraviolet light emitting diode 59 Substrate 60 Heat sink 62 Air passage hole 63 Base Plate 64 Light distribution lens 66 Reflector plate 68 Connection port 70 Inclined surface 74 Ultraviolet light distribution area 80 Virus infection prevention device 92 Shoulder harness 94 Storage section 96 Bridging member 98 Fixture θ Light distribution angle A One end B Other end 100 Filter 102 Microparticles 104 Droplets 106 Saliva 108 Virus 110 Gap 200 Microparticle collection efficiency test device 202 Aerosol-containing compressed air 204 Differential pressure gauge 206 Bellows 208 Particle counter 210 Glass chamber 212 Constant flow rate suction pump 214 Sample 220 Droplet collection efficiency test device 222 Compressed air 224 Splash 226 Glass chamber 228 Sample 230 Bellows 232 Andersen sampler 234 Cascade impactor 236 Agar medium 238 Petri dish 240 Constant flow suction pump 242 Pollen particle collection efficiency test device 244 Pollen-containing air 246 Sample 248 Constant flow suction pump 300 Ultraviolet light Light emitting diode 302 Ultraviolet light distribution area 304 Substrate 306 Base plate 308 Air passage hole 310 Cylindrical body

Claims (17)

a mouth part arranged around the user's mouth;
an air cleaning unit that takes air into the interior, irradiates the taken in air with ultraviolet rays, supplies the air irradiated with the ultraviolet rays to the mouth, or discharges the air irradiated with the ultraviolet rays into the air; and,
an air supply hose that communicates the mouth part and the air cleaning part;
A virus infection prevention device comprising at least the following:
The air cleaning section
a cylindrical body having a connection port for an air supply hose at each of one end and the other end;
An air supply provided further inward than a connection port on one end side of the cylindrical body, for taking in the air into the cylindrical body and discharging the air irradiated with the ultraviolet rays from inside the cylindrical body. with fans,
an ultraviolet light emitting diode that is provided further inward than the connection port on the other end side of the cylindrical body and irradiates the air taken into the cylindrical body with ultraviolet rays;
a reflector plate provided between the air supply fan and the ultraviolet light emitting diode and reflecting ultraviolet light emitted from the ultraviolet light emitting diode;
has
A virus infection prevention device characterized in that the reflection plate has an inclined surface that substantially matches a distribution angle of ultraviolet light emitted from the ultraviolet light emitting diode. The reflective plate is
A plate-like body,
2. The virus infection prevention device according to claim 1, further comprising an ultraviolet reflection film formed on the surface of said plate-like body. A light distribution lens is provided on the emission side surface of the ultraviolet light emitting diode from which the ultraviolet rays are emitted,
The virus infection prevention device according to claim 1, wherein the light distribution angle of the ultraviolet rays is adjusted by the light distribution lens. The virus infection prevention device according to claim 1, wherein a distribution angle of the ultraviolet light emitted from the ultraviolet light emitting diode is within a range of 25 degrees to 140 degrees. The ultraviolet light emitting diode is disposed on a base plate having a plurality of air passage holes via a substrate,
The virus infection prevention device according to claim 1, wherein the base plate is fixed to an inner surface of the cylindrical body. A heat sink is provided on a surface of the base plate opposite to the side on which the ultraviolet light emitting diode is disposed,
Virus infection according to claim 5, characterized in that the position of the heat sink is set so that the position of the ultraviolet light emitting diode and the position of the heat sink overlap when the ultraviolet light emitting diode is viewed from above. Prevention device. The ultraviolet light emitting diode eliminates 98% or more of viruses in droplets present in 2000 cc of air taken into the space formed by the reflector in the cylindrical body within 2 seconds or less. The virus infection prevention device according to claim 1, having the ability to activate. The virus infection prevention device according to claim 1, wherein the ultraviolet light intensity of the ultraviolet light emitted from the ultraviolet light emitting diode is within the range of 2 mW/cm ² to 500 mW/cm ² . The virus infection prevention device according to claim 1, wherein the wavelength of the ultraviolet light emitted from the ultraviolet light emitting diode is within the range of 210 nm to 290 nm. The virus infection prevention device according to claim 1, wherein the amount of air blown by the air blowing fan is 600 cc or more per second. The virus infection prevention device according to claim 1, wherein one end of the air supply hose is detachably connected to a connection port provided at the mouth. The other end of the air supply hose is detachably connected to either a connection port on one end side or a connection port on the other end side of the cylindrical body of the air cleaning unit. The virus infection prevention device according to claim 1. The mouth part is
The virus infection prevention device according to claim 1, characterized in that it is made of a highly transparent resin with a total light transmittance (according to JIS K7105, measured on a 1 mm thick sheet) of 80% or more. The virus infection prevention device according to claim 1, wherein the mouth portion is configured in a funnel shape. The virus infection prevention device according to claim 1, wherein the mouth portion is configured in the shape of an oxygen mask that covers the mouth and nose of the user. The virus infection prevention device according to claim 1, further comprising a shoulder harness having a storage section for storing the air cleaning section. The shoulder harness is provided with a bridging member that bridges the left and right sides of the shoulder harness,
17. The virus infection prevention device according to claim 16, wherein the mouth portion is provided with a fixture that is fixed to the bridging member.

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