WO2023135829A1

WO2023135829A1 - Hypochlorous acid gas generation structure, hypochlorous acid gas generation device, air conditioning system, and building

Info

Publication number: WO2023135829A1
Application number: PCT/JP2022/014784
Authority: WO
Inventors: 敏宏松永
Original assignee: 株式会社Fmi
Priority date: 2022-01-11
Filing date: 2022-03-28
Publication date: 2023-07-20
Also published as: JP2023101839A; JP7057607B1

Abstract

This hypochlorous acid gas generation structure comprises a hypochlorous acid water storage tank and double cylindrical walls and is characterized in that a lower part of the outer cylindrical wall is immersed in hypochlorous acid water, a lower part of the inner cylindrical wall is separated from hypochlorous acid water, the hypochlorous acid water is made into mist within the inner cylindrical wall, the hypochlorous acid water in a liquid droplet state is dribbled down on the inner cylindrical wall and collected in the storage tank, the mist in a vapor phase state is evenly introduced into the space between the double cylindrical walls through the gap between the bottom of the inner cylindrical wall and the surface of the hypochlorous acid water in the storage tank, the mist in the vapor phase state attaches on the inner surfaces of the double cylindrical walls while the mist rises and becomes droplets, the droplets are collected, and only hypochlorous acid in the vapor phase state is discharged from a gas discharge port unaffected by airborne droplets from the hypochlorous acid water surface and is characterized by suppressing humidification of a space to be subjected to microorganism elimination and discharging only the hypochlorous acid gas in the vapor phase state that deactivates viruses.

Description

Hypochlorous acid gas generating structure, hypochlorous acid gas generator, air conditioning system and building

The present invention suppresses humidification of the space to be sterilized, releases only the hypochlorous acid gas in the gas phase that deactivates the virus from the hypochlorous acid water, and uniformly thins the space to be sterilized in a short time. The present invention relates to a hypochlorous acid gas generating structure, a hypochlorous acid gas generator, an air conditioning system and a building capable of supplying concentrated hypochlorous acid gas.

Specifically, the hypochlorous acid gas generator is equipped with a hypochlorous acid water storage tank at the bottom, has a double cylindrical wall of an outer cylindrical wall and an inner cylindrical wall, and has a lower portion of the outer cylindrical wall is immersed in hypochlorous acid water, the lower part of the inner cylindrical wall is separated from the hypochlorous acid water, the hypochlorous acid water is misted inside the inner cylindrical wall, and hypochlorous acid in the form of droplets Water is transmitted to the inner cylindrical wall and collected in the storage tank, and the mist, which is in a gas phase state, passes through the gap between the bottom of the inner cylindrical wall and the hypochlorous acid water surface of the storage tank, and flows between the double cylindrical walls. Raise the gap space of

Then, while the mist in the gas phase is rising, the mist that adheres to the inner surface of the double cylindrical wall and becomes droplets is collected in the lower storage tank, and the hypochlorous acid in the gas phase is collected. Only is released from the gas outlet that is not affected by droplets from the hypochlorous acid water surface. Hypochlorous acid gas generating structure, generator, air-conditioning system, and hypochlorous acid gas generating structure, generator, and air conditioning system that generate only gaseous hypochlorous acid gas without releasing liquid hypochlorous acid, which is feared to cause health hazards and metal corrosion. Regarding buildings.

Hypochlorous acid is a molecule made up of hydrogen atoms, chlorine atoms, and oxygen atoms bonded together, and exists in either a liquid phase or a gas phase at normal temperature and pressure. In this application, the state in which hypochlorous acid is dissolved in liquid water is referred to as "hypochlorous acid water", and the state in which hypochlorous acid is suspended in the air as fine droplets is referred to as "mist ”, and hypochlorous acid in the gas phase state is called “hypochlorous acid gas”. Mist with a size of 5 μm or less is included in hypochlorous acid gas in a gaseous state because it is vaporized instantaneously.

Conventionally, many types of virus deactivation devices have been provided that emit mist generated from hypochlorous acid water into living spaces to deactivate airborne viruses and adhering viruses. Due to the pandemic of the new coronavirus (COVID-19), virus deactivation in living spaces has become an urgent issue, and virus deactivation equipment using hypochlorous acid has attracted strong interest compared to before the corona disaster. .

However, due to the distribution of simple humidifiers that emit hypochlorous acid mist with large particle diameters, and the use of sprays that spray hypochlorous acid water in space, there has been an increase in the number of people who inhale the mist, resulting in health problems. It was feared that damage would occur. The WHO, the Ministry of Health, Labor and Welfare, etc. have expressed their view that they do not recommend spatial spraying of hypochlorous acid water due to concerns about health hazards on respiratory organs. In particular, the spread of virus inactivation devices using hypochlorous acid has been stagnant due to concerns about the health hazards of people with chronic respiratory diseases, growing infants and children.

On the other hand, according to the website of the "General Incorporated Association Hypochlorous Acid Water Promotion Council", a case of spatial spraying of low-concentration hypochlorous acid water is disclosed. According to this, there are many cases of spatial spraying, including overseas, and examples of spatial spraying at event venues where people gather are shown in Japan, and it is claimed that there is no noticeable health hazard.

Patent Document 1 discloses a technology of a device that inactivates influenza viruses even at low humidity of 30% to 50% relative humidity by the present applicant. This technology suppresses humidification due to the generation of liquid droplets and liquid particles in order to deactivate airborne viruses with hypochlorous acid gas at low humidity that can suppress the growth of fungi.

Specifically, the hypochlorous acid solution is rotated and oscillated in a liquid state, and hypochlorous acid gas is generated by surface friction between the air in the air circulation unit and the hypochlorous acid solution, and the air intake is It is a device that introduces air and releases air containing hypochlorous acid gas due to the pressure difference between the air outlet and the air outlet, and releases hypochlorous acid gas while suppressing the amount of moisture released. .

However, according to this device, it is necessary to maintain a liquid phase state where droplets do not fly so that the hypochlorous acid water does not generate droplets or liquid fine particles. In addition, there is a problem that it is difficult to increase the size of the apparatus. For this reason, the amount of hypochlorous acid gas generated is limited, and in addition to being able to inactivate the virus only in a small space, there was a problem that hypochlorous acid gas could not be diffused throughout the entire space in a short time. .

After the development of this device, the present inventor conducted a test to confirm the relationship between the relative humidity of the space and the half-life period of hypochlorous acid gas in order to confirm the active period during which hypochlorous acid gas maintains its activity. . In addition, we confirmed the virus inactivation effect of hypochlorous acid gas according to the relative humidity. From these test results, if the relative humidity is suppressed to 60% or less, not only hypochlorous acid gas is effectively generated from hypochlorous acid water, but also the volatilized hypochlorous acid gas It was found that it was easy to maintain the activity.

In Patent Document 2, a rotating cylindrical net body through which water and air can pass is provided, and the water collides with the inner wall of the net body to turn the water into mist, thereby increasing the surface area of the water and allowing it to pass through the processing chamber. There is disclosed a technology of a negative ion generator for increasing the concentration of negative ions in the air to be treated.

According to the device disclosed in this technique, the net body is rotated to blow air from above the space in which the water is turned into mist, toward the water surface, and the mist-laden air from the net body collides with the water surface. and is turned upside down to discharge the air from the discharge port. According to this technology, the water surface is disturbed by the blown air, and many droplets are generated from the water surface. There was a problem that the humidity of the air tends to be high.

Patent Document 3 discloses a technique for miniaturizing the main body of a negative ion generator. According to this technique, an inner cylinder is arranged concentrically in a cylindrical case, the case and the lower part of the inner cylinder are submerged, and a notch is provided in a part of the inner cylinder to form an inner cylinder. Air mixed with water mist generated in the inner cylinder is passed through the notch between the case and the inner cylinder through the notch, raised by a swirling motion, and released to the outside.

However, according to this technique, the water surface in the inner cylinder is disturbed by the collision of the downward flow, and the water surface between the case and the inner cylinder is disturbed by the swirling flow generated through the notch, and many is generated, and even if the water droplets are dropped and collected, there is a problem that humid air is generated together with negative ions.

When hypochlorous acid water is applied to the techniques described in Patent Documents 2 and 3, the relative humidity of the space to be sterilized is humidified to 60% or more, which is not suitable for the diffusion of hypochlorous acid gas. Hypochlorous acid mist in a liquid state could also diffuse into the space to be sterilized. Therefore, the applicant has developed a technology that generates only hypochlorous acid gas without generating hypochlorous acid water in the liquid phase state of droplets and liquid particles, and makes it difficult to increase the humidity of the released sterilization space. He devoted himself to the development and conceived of the present invention.

Patent Document 1: International Publication No. 2021-49045 Patent Document 2: JP-A-9-203540 Patent Document 3: JP-A-9-264574

The problem to be solved by the present invention is to suppress humidification of the space to be sterilized, release only the hypochlorous acid gas in the gaseous state that deactivates the virus from the hypochlorous acid water, and allow the space to be disinfected for a short time. To provide a hypochlorous acid gas generating structure, a hypochlorous acid gas generator, an air-conditioning system and a building capable of supplying hypochlorous acid gas having a uniformly low concentration.

A first invention of the present invention is a hypochlorous acid gas generating structure for generating only hypochlorous acid in a gaseous state, wherein the hypochlorous acid gas generating structure comprises a storage tank of hypochlorous acid water, An outer cylindrical wall forming a double cylindrical wall includes a double cylindrical wall, a gas passage, an air pressurizing means, a hypochlorous acid water misting means, and a gas discharge port, and the storage tank and the lower part is immersed in the hypochlorous acid water, and the inner cylindrical wall forming a double cylindrical wall has a gap between the lower periphery and the hypochlorous acid water surface of the storage tank. and the inside of the inner cylindrical wall serves as a gas path, the storage tank penetrates the inside and outside of the outer cylindrical wall, and the air pressurizing means passes the gas from the gas inlet through the inside of the inner cylindrical wall. The outside air is pressurized and guided to the discharge port, the misting means comprises a cylindrical mesh body and hypochlorous acid water diffusion means, and the mesh body rotates concentrically with the double cylindrical wall. The diffusion means causes the hypochlorous acid water to collide with the net body inside the inner cylindrical wall to generate mist, and the hypochlorous acid water in a liquid phase is emitted inside the inner cylindrical wall. The mist that is dropped and collected in the storage tank and becomes a gas phase is guided upward from the periphery of the gap to the gap space formed by the double cylindrical walls, and while the mist is rising, The mist formed into droplets in the gap space is dropped and collected in the storage tank in the area of the gap space, and the gas discharge port is provided at an upper portion outside the region of the outer cylindrical wall, and from the gas discharge port, It is characterized by releasing only mist in gas phase and hypochlorous acid gas.

The hypochlorous acid water may be produced by dissolving sodium dichloroisocyanurate in water, or by electrolyzing an aqueous sodium chloride solution to generate slightly acidic hypochlorous acid water, and the manufacturing method is not limited. Hypochlorous acid water has different properties depending on the pH, but pH 3.0 to pH 7.5 is suitable because hypochlorous acid gas with excellent virus deactivation effect is easily generated.

The hypochlorous acid water misting means is a cylindrical mesh and hypochlorous acid water diffusion means. The dispersing means may immerse a funnel-shaped rotating body with an open bottom end in hypochlorous acid water, draw up the hypochlorous acid water by centrifugal force, and disperse it as droplets, and spray it by a spraying means. You may let The net body is preferably made of stainless steel so as to suppress corrosion, but the standard of the net body is not limited.

Since the droplets dispersed by the dispersion means collide with the rotating mesh, fine mist can be generated inside the inner cylindrical wall. By the air pressurization means, the air introduced from the outside air inlet is lowered toward the surface of the hypochlorous acid water in the inner cylindrical wall where the mist is generated. The introduced air and the generated mist pass through the gap around the bottom of the inner cylindrical wall and the hypochlorous acid water surface, and are evenly introduced into the gap space between the outer cylindrical wall and the inner cylindrical wall and rise. be. Since the hypochlorous acid water surface outside the outer cylindrical wall is not disturbed because the entire circumference of the gap is raised evenly without being biased to a part of the gap.

The mist that did not become fine diameter becomes droplets and falls along the inner wall into the reservoir and is collected. The fine mist rises evenly through the entire gap between the inner cylindrical wall and the outer cylindrical wall, but some of the mist becomes droplets in the process. The droplets of mist adhere to the inner surfaces of the inner cylindrical wall and the outer cylindrical wall facing the gap, drop into a storage tank, and are collected. Since the gas discharge port is provided in the upper portion outside the region of the outer cylindrical wall, only fine mist reaches the gas discharge port without being affected by droplets caused by disturbance of the hypochlorous acid water surface.

Along with the hypochlorous acid gas, fine mist that did not form droplets reaches the gas outlet and is released into the space to be sterilized. If the size of the mist that does not form droplets is 5 μm or less, it is instantaneously gasified, so that when it is discharged from the gas discharge port, it becomes hypochlorous acid gas. In addition, "only mist and hypochlorous acid gas in gas phase" means that it does not need to contain hypochlorous acid that is released in liquid phase, and of course the outside air is included. It's about.

According to the first aspect of the present invention, the hypochlorous acid water is turned into mist, and the mist in the liquid state is recovered in the inner cylindrical wall and in the space between the inner cylindrical wall and the outer cylindrical wall. Then, only fine mist and hypochlorous acid gas, which are in a gaseous state, are discharged from the gas outlet provided outside the area of the outer cylindrical wall, which is not affected by droplets, into the space to be disinfected to deactivate the virus. I am releasing it. According to the first invention, only hypochlorous acid gas can be released in a larger amount than before while suppressing the humidification effect. As a result, even in a large space, it is possible to effectively generate hypochlorous acid gas that deactivates viruses in a short period of time.

A second invention of the present invention is a hypochlorous acid gas generator that generates only hypochlorous acid in a gas phase state, wherein the hypochlorous acid of the first invention It is characterized by having a gas generating structure. According to the second invention, since the hypochlorous acid gas generating structure of the first invention is configured in an integrated device, there is an effect that it can be easily moved and used.

A third invention of the present invention is the hypochlorous acid gas generator of the second invention, wherein the gas discharge port can be equipped with a first moisture release amount suppressing means, and the gas A water-repellent nonwoven fabric in which the path from the gas inlet to the gas outlet is airtight, and the first water release suppressing means has a fiber diameter of 1 μm or more and 30 μm or less and a pressure loss of 20 Pa or more and 60 Pa or less. It is characterized by being used as a filter.

"Airtight from the gas inlet of the gas path to the gas outlet" means that the gap between the main body and the lid of the device is airtight so that the mist in the liquid state does not leak. The non-woven fabric filter may be attached either inside or outside the gas discharge port, but if it is attached inside, the mist that did not turn into gas becomes fine water droplets and easily falls into the water tank, which is preferable.

According to the Japanese Industrial Standard "JIS T9001 (Performance requirements and test methods for medical and general masks)" established in 2021, the pressure loss of masks worn by people is specified to be 20 Pa or more and less than 60 Pa. rice field. The non-woven fabric filter of the second invention has water repellency, has a fiber diameter of 1 μm or more and 30 μm or less, and is an easily available filter that satisfies the JIS standard.

In addition, an electrostatically treated non-woven fabric filter made of polyurethane resin, polyethylene resin, polypropylene resin, etc. used for general masks has a pressure loss of about 30 Pa, and depending on the water repellency and fiber diameter, the particle size If the mist is up to 2 μm, it can be removed at a rate of 98% or more, which is preferable. According to the third invention, only the hypochlorous acid gas can be efficiently released while the amount of water released is further suppressed.

A fourth invention of the present invention is the hypochlorous acid gas generator of the second invention, wherein the gas discharge port can be equipped with a second moisture release amount suppressing means, and the gas The path from the gas introduction port to the gas discharge port is airtight, and the second moisture release suppressing means includes hydrophobic nanofibers having a fiber diameter of 70 nm or more and 200 nm or less and a pressure loss of 20 Pa or more and 60 Pa or less. It is characterized by being used as a filter.

According to the fourth invention, the gas outlet is provided with a nanofilter that serves as the second means for suppressing the amount of water released. Hydrophobic nanofibers with a fiber diameter of 70 nm or more and 200 nm or less absorb and filter fine particles by Van der Waals force. Therefore, even substances of a size that cannot be removed by a non-woven fabric filter, for example, fine water particles with a particle diameter of 100 nm, and even solid particles such as chlorides can be removed.

Unlike electrostatic treatment, the van der Waals force does not reduce filtration performance even if the fibers get wet. It is preferable to be The nanofilter is not limited to being composed only of nanofibers, and may be provided with nonwoven fabric forming a shape-retaining layer on both sides of the nanofibers.

In addition, the nanofilter may be used alone, or may be used in combination with the nonwoven fabric filter of the third invention. Suitable materials for the hydrophobic nanofibers include, for example, polyurethane resins and polypropylene resins, since the diameter of the fibers can be easily reduced. According to the fourth invention, even solid particles such as chlorides can be removed, and the amount of moisture released can be further suppressed, and only gas in the gas phase is released from the hypochlorous acid gas generator. can be made

A fifth invention of the present invention is the hypochlorous acid gas generator of the second invention, wherein the gas discharge port can be equipped with a third moisture release amount suppressing means, and the gas The path from the gas inlet to the gas outlet is airtight, and the third moisture release suppressing means is a repellent fiber having a fiber diameter of 1 μm or more and 30 μm or less and a pressure loss of 20 Pa or more and 60 Pa or less from the upstream side. A double filter consisting of a nonwoven fabric filter having water and a nanofilter containing hydrophobic nanofibers having a fiber diameter of 70 nm or more and 200 nm or less and having a pressure loss of 20 Pa or more and 60 Pa or less, and the distance between the double filters is at least 5 mm. or more.

According to the fifth invention, the gas discharge port is provided with a double filter that serves as the third means for suppressing the amount of water released. The nonwoven fabric filter forming a double filter is the same as the nonwoven fabric filter of the third invention, and the nanofilter is the same as the nanofilter of the fourth invention.

Even if the filter is doubled, the maximum pressure loss is less than 120 Pa, which is about half the pressure loss of a HEPA filter, so it can be applied to large-capacity equipment. If a filter with low pressure loss is combined, gas can be discharged through a double filter even with a fan that has high air permeability and is used in a domestic gas generator.

Since the double filters are spaced apart by at least 5 mm, even if fine water adhering to the upstream surface of the non-woven fabric filter due to the pressure of the air pressurizing means, it may blow out between the double filters. Also, fine moisture is vaporized before reaching the nanofilter. According to the fifth invention, it is difficult for mist to clog the gaps of the nanofilter, and even if the gas generator is operated continuously for a long period of time, the amount of released water can be suppressed.

A sixth invention of the present invention is the hypochlorous acid gas generator according to the third to fifth inventions, wherein the upstream surface of the water release amount suppressing means attached to the gas discharge port is an inclined surface. None, the mist droplets on the upstream surface are dropped into the storage tank along the inclined surface. When the filter serving as the water release amount suppressing means is attached, the upstream surface of the filter is pressurized, and during long-term continuous operation of the apparatus, the mist that has not passed through the fine filter is deposited on the surface of the filter. It may become fine water droplets and adhere.

According to the sixth aspect of the invention, since the upstream surface of the water release amount suppressing means forms an inclined surface, fine water droplets are easily turned into large droplets and are easily allowed to naturally fall along the inclined surface. In the case where the moisture release amount suppressing means is a double filter, it is preferable to bend the upstream surface of only the non-woven fabric filter disposed on the upstream side, that is, on the storage tank side. According to the sixth invention, even if the hypochlorous acid gas generator is continuously operated for a long period of time, the amount of gas generated is unlikely to decrease, and the gas can be stably and continuously discharged.

A seventh invention of the present invention is the hypochlorous acid gas generator according to the third to fifth inventions, wherein gas diffusion means for generating an air flow is provided outside the gas discharge port, and the gas is The diffusing means is characterized by diffusing the hypochlorous acid gas released from the gas outlet.

When the filter makes it difficult for hypochlorous acid gas to be released, it tends to accumulate near the release port. According to the seventh invention, by diffusing the hypochlorous acid gas with the fan, the hypochlorous acid gas having a short half-life period can be rapidly diffused, and the hypochlorous acid gas of high concentration can be diffused. It diffuses hypochlorous acid gas at a low concentration to every corner of a room with a large air volume, inactivating viruses in a short time and preventing metal corrosion.

An eighth invention of the present invention is an air conditioning system that generates only hypochlorous acid in a gaseous state and supplies it to a room in an air conditioning system, wherein the hypochlorous acid gas generating structure of the first invention is used for air conditioning. In preparation for the route, only mist and hypochlorous acid gas in a vapor phase state are introduced into the fresh air introduction route into the room and supplied.

The air conditioning system should pressurize the air taken in from the outside with the air pressurization means and introduce it into the fresh air supply path. According to the eighth invention, a low humidity environment is provided, hypochlorous acid gas is supplied together with ventilation with fresh outside air, and deodorization and sterilization are performed in a state where the growth of fungi is suppressed, and the elderly and An unprecedented advantageous effect can be obtained that an air-conditioning system suitable for a medical care room can be provided.

A ninth aspect of the present invention is a building in which the air-conditioned area is divided into a plurality of compartments. It is characterized by having According to the ninth invention, since the air-conditioned area is divided into a plurality of compartments, hypochlorous acid gas, which has a virus-inactivating effect but has a limited half-life cycle, is effectively supplied to each compartment. There is an effect that it can be a building that

・According to the first aspect of the present invention, only hypochlorous acid gas can be released more than before while suppressing the humidification effect, and viruses can be deactivated even in a large space. An unprecedented advantageous effect of being able to generate hypochlorous acid gas effectively in a short period of time is exhibited.
- According to the second invention of the present invention, since the hypochlorous acid gas generating structure of the first invention is configured in an integrated device, there is an effect that it can be easily moved and used.
- According to the third aspect of the present invention, only hypochlorous acid gas can be efficiently released while the amount of water released is further suppressed.

- According to the fourth aspect of the present invention, even solid particles such as chlorides can be removed, and the amount of water released can be further suppressed, and the gas phase state from the hypochlorous acid gas generator can be reduced. Only gas can be released.
- According to the fifth aspect of the present invention, it is difficult for mist to clog the gaps of the nanofilter, and even if the gas generator is operated continuously for a long period of time, the amount of water released can be suppressed.
・According to the sixth aspect of the present invention, even if the hypochlorous acid gas generator is continuously operated for a long time, the amount of gas generated is unlikely to decrease, and the gas can be stably and continuously released. can be done.
- According to the seventh aspect of the present invention, by diffusing the hypochlorous acid gas with the fan, the hypochlorous acid gas with a short half-life period can be rapidly diffused, and the hypochlorous acid gas with a high concentration It diffuses hypochlorous acid gas at a low concentration to every corner of a room with a large air volume without causing chloric acid gas to be concentrated, inactivating viruses in a short time and preventing metal corrosion.

・According to the eighth aspect of the present invention, a low humidity environment is provided, hypochlorous acid gas is supplied together with ventilation with fresh outside air, and deodorization, sterilization, etc. are performed in a state where the growth of fungi is suppressed. , the air conditioning system can be made suitable for the elderly and medical rooms, which is an unprecedented advantageous effect.
・According to the ninth aspect of the present invention, hypochlorous acid gas, which has a virus inactivating effect but has a limited half-life cycle, can be effectively supplied to each section. play.

Explanatory drawing of hypochlorous acid gas generator (Example 1). Confirmation test for the half-life period of hypochlorous acid gas. Confirmation test of the correlation between relative humidity and the amount of hypochlorous acid gas generated. Filter effect confirmation test. Hypochlorous acid gas generation confirmation test. Liquid phase mist absence confirmation test. Virus inactivation test. Testing relative humidity and hypochlorous acid gas concentration. Explanatory drawing of a filter (Example 2). Explanatory drawing of another aspect of a filter (Example 2). FIG. 10 is a diagram of a drop adhering to a filter (Example 2). Explanatory drawing of an air-conditioning system and a building (Example 3).

The hypochlorous acid gas generator (hereinafter referred to as the generator) is provided with a double cylindrical wall, the outer cylindrical wall forming the double cylindrical wall is erected from the storage tank, and the lower part is It was immersed in chloric acid water to provide a gap between the lower periphery of the inner cylindrical wall and the hypochlorous acid water surface. Inside the inner cylindrical wall, the air introduced by the air pressurization means collides with the rotating net body of hypochlorous acid water to generate mist, and the mist descends in the inner cylindrical wall to create a double The gap space formed by the cylindrical wall is made to rise.

The mist that becomes droplets in the gap space adheres to the wall surface between the double cylindrical walls and is dropped and collected in the storage tank. A gas discharge port is provided on the outside of the outer cylindrical wall where droplets from the chloric acid water surface do not fly, and only mist and hypochlorous acid gas (hereinafter referred to as gas) that are in a gas phase state are emitted.

In order to facilitate understanding of the present invention, the first test for confirming the properties of the gas and the second test using the device according to the present invention will be explained, and then the examples will be explained. As the first tests, a "gas half-life period confirmation test" and a "first confirmation test of the correlation between the relative humidity and the amount of gas generated" were performed. As the second test, using this device, "moisture release test", "filter effect confirmation test", "gas generation confirmation test", "liquid phase mist absence confirmation test", "influenza virus deactivation test", A "second confirmation test of the correlation between the relative humidity and the amount of generated gas" was carried out.

First, the apparatus and experimental environment used in the first test will be described. In the first test, a humidity control device and a gas generation device described in Patent Document 1 were installed in a test container having a volume of 1.2 m ³ . The gas generator uses a small fan with an air volume of about 0.012 m ³ per minute.

In order to more accurately confirm the properties of the gas, hypochlorite was dissolved in purified water, chlorides were removed, and gas was generated from the hypochlorous acid water whose pH was adjusted to be weakly acidic. The amount of hypochlorous acid water was 500 ml, and the effective chlorine concentration was adjusted to about 100 ppm. The test room was set to a test environment of 20°C.

(Gas half-life period confirmation test)
In the "gas half-life cycle confirmation test", only purified water was used in advance, and the initial relative humidity in the experimental container was changed from 10% to 70% by 10%, and the initial relative humidity and gas were reduced by half. A correlation with the cycle was confirmed (points a to g in FIG. 2).

After the desired initial relative humidity, for example 10%, the generator was driven in the test container for 10 minutes. Measure the maximum available chlorine concentration in the test container after 10 minutes, and measure the time from reaching the maximum available chlorine concentration until the available chlorine concentration becomes 1/2 (hereinafter referred to as the half-life cycle), and at that time Final relative humidity was measured. The test results are shown in Table 1 below and FIG. Note that the maximum effective chlorine concentration at each humidity is different.

[Table 1]

The half-life period was the longest when the initial relative humidity was adjusted to 10%, and was about 38 minutes (see Table 1, a in Figure 2). The half-life period gradually decreased as the initial relative humidity increased, and decreased to an initial relative humidity of 60%, at which time the half-life period was about 10 minutes (see f in Table 1 and Fig. 2). When the initial relative humidity was adjusted to 70%, the half-life period was 22 minutes (see Table 1, Fig. 2g).

　In a humid environment with a long half-life cycle of gas, the gas can be left to float in the space to be disinfected for a long time, so even if the gas concentration is low, the virus deactivation effect can be expected. It was confirmed that the relative humidity of the space to be sterilized, which has a long half-life cycle that facilitates maintenance of gas activity, should preferably not exceed 50% without excessive humidification of the space to be sterilized.

(First Confirmation Test of Correlation Between Relative Humidity and Gas Generation Amount)
"The correlation between the relative humidity of the space to be sterilized and the amount of gas generated" is obtained by setting the relative humidity in the test container to a humidity environment of 10% to 70% in advance, and the generator described in Patent Document 1 in the test container. was driven to generate gas, and the amount of gas generated was measured. The test results are shown in Table 2 below and FIG.

[Table 2]

From this confirmation test, the gas concentration in the test container was 12.5 ppb when the relative humidity was 20%, which was the highest value (see i in Table 2 and Fig. 3). As the relative humidity increased, the amount of gas generated gradually decreased with the same slope up to a relative humidity of 50%. On the other hand, after exceeding 60% relative humidity, the amount of gas generated decreased, and at 70% relative humidity (see n in Table 2 and Fig. 3), it was about one-third that at 20% relative humidity. It was confirmed that the amount was significantly reduced.

If gas is generated in a humidity region with a large amount of gas generation and a long half-life period, a large virus deactivation effect can be expected even with a small generator. From the above two confirmation tests, in order to suppress the growth of fungi such as mold, to efficiently generate gas, and to extend the effective activity period, the amount of moisture released is suppressed, and the relative humidity is 50%. It has been found suitable to generate the gas in the following humidity environment.

Next, the generator according to the present invention used in the second test will be described (see FIG. 1). The air pressurizing means of the apparatus is a sirocco fan with a blowing capacity of about 1.2 m ³ per minute and a pressurizing capacity of about 147 Pa. In the second test, gas was generated from hypochlorous acid water in which sodium dichloroisocyanurate was dissolved in water. The amount of hypochlorous acid water used at one time was 3 L, and the concentration of hypochlorous acid water was about 100 ppm. The second test was carried out by setting the room temperature to 22° C. in a reinforced concrete room with a floor area of about 55 m ² and a volume of about 135 m ³ where only temperature control and ventilation were possible.

(Moisture release test)
In the moisture release test, the generator 1 of Example 1 of the present invention was used, continuous operation was performed for 6 hours, and the amount of moisture released into the sterilization target space was confirmed from the remaining amount of water. The moisture release test was conducted in four modes: no filter attached to the gas outlet, only a nanofilter attached, only a non-woven fabric filter attached, and a double filter attached.

According to "Japan Electrical Manufacturers' Association Standard: JEM1426", a recommended rated humidification capacity of a humidifier is defined according to the applicable floor area. The rated humidifying capacity is the humidifying capacity per hour at room temperature of 20° C. and humidity of 30%. Since the floor area of the test room is about 55 m ² and the building is made of reinforced concrete, the rated humidifying capacity originally required for the humidifier is about 1200 mL/h. Table 3 below shows, as test results, the amount of water released for 6 hours, the humidifying capacity per hour, and the humidifying ratio with respect to the rated humidifying capacity.

[Table 3]

The generator 1 has a humidification capacity of 215 mL per hour without a filter that suppresses the amount of water released, which is only 18% of the recommended rated humidification capacity. . When the filter was attached, the humidification capacity per hour was 50 mL to 60 mL, which was 4% to 5% of the rated humidification capacity, and it was confirmed that only a very small amount of water was released.

(Filter effect confirmation test)
A filter effect confirmation test was conducted by changing the type of the filter 100 to confirm the difference in the influence of the released gas on the metal corrosive action (see FIG. 4(A)). The gas outlet 31 of the generator 1 was covered with filters of different types, copper fibers 110 made of fine wires were placed, and differences in corrosion were confirmed. A total of four tests were carried out, one in which the specimen was exposed to the air, and the other in which 100 ppm of hypochlorous acid water was used. The test time for each test was 2 hours. The results of this test are shown in Table 4 below and in FIG. FIG. 4(A) shows a test state, and FIG. 4(B) shows a photograph of copper fibers.

[Table 4]

In Fig. 4(B), the specimens are arranged in order of least corrosion. No change was observed when the copper fibers were only exposed to the space (a in FIG. 4(B)). When a nanofilter was attached to the gas outlet and a copper fiber was placed on the nanofilter (b in FIG. 4(B)), the peripheral edge was discolored, but the metallic luster remained in other areas. was When a non-woven fabric filter was attached to the gas discharge port and copper fibers were placed on the non-woven fabric filter (Fig. 4(B), c), the overall color was dull and the metallic luster was lost. When a copper fiber was hung from the gas outlet without attaching a filter to the gas outlet (d in FIG. 4(B)), the entire surface turned black and had no metallic luster.

According to this test, since the metallic luster remained when using the nanofilter, fine particles such as chloride contained in the hypochlorous acid water were removed by Van der Waals force, and the nanofilter was attached. It has been confirmed that corrosion of metal due to fine particles can be suppressed by adding Moreover, it was confirmed that it is difficult to suppress metal corrosion only with a non-woven fabric filter.

(Gas generation confirmation test)
As a test for confirming that gas is being generated, the rod body 200 was erected on the gas discharge port 31, and the rod body 200 was placed in a total of three positions: the position closest to the gas discharge port 31 and two positions spaced upward by 20 cm. , the copper fiber 210 is protruded laterally from the rod body 200, and the state of gas generation is confirmed by metal corrosion at each position (see FIG. 5A). The test time is 6 hours. Test results are shown in Table 5 and FIG. FIG. 5(A) shows a test state, and FIG. 5(B) shows a photograph of copper fibers.

[Table 5]

The figures in Fig. 5(B) are arranged in descending order of metal corrosion. In the gas generation confirmation test, the copper fiber (a in FIG. 5(B)) positioned directly above the gas discharge port was wholly blackened and lost its metallic luster. The copper fibers separated from the gas outlet by 20 cm (b in FIG. 5(B)) had a slight discoloration at the peripheral edges and most of the metallic luster remained. The copper fibers separated from the gas outlet by 40 cm (c in FIG. 5(B)) did not discolor at all.

From this test result, gas is generated from the gas discharge port, and the gas affects the metal directly above the gas discharge port, but if it is separated from the gas discharge port by 20 cm, the gas diffuses and the effect on the metal diminishes. , 40 cm or more, the gas diffuses widely, and it was confirmed that the influence on metal corrosion is small even without a filter.

(Liquid phase mist absence confirmation test)
A test was conducted to confirm that the hypochlorous acid coming out of the gas outlet did not emit liquid-phase mist (see Fig. 6). At the same time, the state of metal corrosion is confirmed with hypochlorous acid. FIG. 6(A) shows a test state, and FIG. 6(B) shows a photograph of copper fibers. A cylindrical hood part 300 with an open top is attached to the outside of the gas discharge port, the copper fiber a 310 is suspended inside the hood part, and the copper fiber b 320 is laterally protruded to a position away from the gas flow. At the same time, a tissue paper 330 was attached to the hood part so as to flutter along the wind (see FIG. 6(A)). Hypochlorous acid water has a concentration of 100 ppm, and the capacity remains at 3 L. The copper fiber b320 was positioned about 15 cm away from the hood.

It was confirmed that the tissue paper 330, which was flapping over the hood, did not get wet at all at all times, and that no liquid-phase mist was generated. In addition, the copper fiber a suspended inside the hood portion was visually discolored after 2 hours, and after 6 hours, the whole turned black and lost its metallic luster (Fig. 6(B)). On the other hand, the copper fiber b, which was separated from the gas outlet by 15 cm, showed no discoloration and no loss of metallic luster even after 6 hours. This test also confirmed that the effect of metal corrosion was reduced when the gas outlet was spaced apart.

(Influenza virus inactivation test)
The present applicant discloses the results of an influenza virus inactivation test in the previous Patent Document 1. According to the test results, it was confirmed that the influenza virus can be deactivated simply by filling a space to be sterilized with a relative humidity of 30% to 50% with an extremely low concentration gas of 7 ppb. there is

For this application, the hypochlorous acid gas concentration was further reduced, and a virus inactivation test was carried out. The inside of the test container of 1.2 m ³ was adjusted to a relative humidity of 30% or 50%, and the gas was diffused to about 2 ppb. It was confirmed how the virus was inactivated by the presence or absence of

Specifically, the amount of reduction in the virus infectious titer (TCID50/mL) was confirmed in four cases: with or without gas emission at a relative humidity of 30%, and with or without gas emission at a relative humidity of 50%. bottom. The virus infectivity titer was measured immediately after the start (0 minutes), and after 15 minutes, 30 minutes, and 45 minutes had passed. FIG. 7 shows the results of the influenza virus inactivation test. FIG. 7(A) shows a logarithmic graph of changes in viral infectivity over time, and FIG. 7(B) shows real values of viral infectivity at each measurement time point.

Assuming no gas diffusion, when comparing the rate of decrease in the virus infectivity due to the difference between a relative humidity of 30% and a relative humidity of 50%, when the relative humidity was only 30% (A line), after 15 minutes , decreased to about 31% after 30 minutes, and decreased to about 10% after 45 minutes. On the other hand, when the relative humidity was only 50% (line B), it decreased to about 21% after 15 minutes, decreased to about 8% after 30 minutes, and decreased to about 1% after 45 minutes. %.

It was confirmed that the virus was reduced faster at a humidity of 50% than at a humidity of 30%. In addition, when the relative humidity was 50%, the initial value of the virus infectivity titer was about 68% immediately after the start of the experiment compared to when the relative humidity was 30%. It was confirmed that humidity plays a large role in suppressing the initial value of virus infectivity.

Next, when comparing the rate of decrease in the virus infectivity due to the difference between 30% relative humidity and 50% relative humidity as gas diffusion, when the relative humidity is 30% (C line), 15 minutes have passed. 10% at this point, 1.5% at 30 minutes, and 0.3% at 45 minutes. On the other hand, when the relative humidity is 50% (D line), it decreases to about 4.6% after 15 minutes, to about 0.32% after 30 minutes, and after 45 minutes. It has decreased to about 0.07%.

Even in the case of gas diffusion, it was confirmed that the virus was reduced faster at a humidity of 50% than at a humidity of 30%. It was confirmed that humidity plays a large role. Through this test, with a relative humidity of about 50%, only 2 ppb of gas emission reduced the virus infectivity titer to about 32% immediately after the start, 15% compared to no gas emission at 30% relative humidity. After lapse of 10 minutes, it can be reduced to about 2.2%, which was confirmed to be extremely advantageous.

According to the European Union (EU), the environmental standard for chlorine gas in the air where people can live safely is 0.5 ppm. Since the environmental standard for hypochlorous acid gas has not been established, it was confirmed that the virus can be deactivated with a gas having a concentration of about 1/250 compared to the above environmental standard.

(Second Confirmation Test of Correlation Between Relative Humidity and Gas Generation Amount)
A sealed test chamber with an air volume of 25 m ³ was set at 25° C., and gas was diffused using the generator 1 of Example 1, which will be described later, to confirm changes in relative humidity and gas concentration. The results of this test are shown in FIG. FIG. 8A shows changes in gas concentration, and FIG. 8B shows changes in humidity and temperature in the test chamber. In FIG. 8B, line A indicates relative humidity and line B indicates temperature. It was confirmed that as the relative humidity increased, the gas concentration reached a peak, maintained a saturated state, and then decreased.

The initial relative humidity was 45%. Since the humidity at the start of the experiment was suitable for gas generation and was in a humidity region with a long half-life cycle, the gas increased steeply, reaching a maximum concentration of about 25 ppb at a relative humidity of about 60% 30 minutes after the start. became. As confirmed in the "first confirmation test of the correlation between the relative humidity and the amount of gas generated (hereinafter referred to as the first confirmation test)", the generation of gas slows down after the relative humidity exceeds 50%, Since the half-life period was also shortened, the gas concentration reached a saturated state with a peak of 25 ppb, which continued for about 10 minutes.

About 40 minutes after the relative humidity exceeded 65%, the gas concentration tended to decrease slightly, as confirmed in the first confirmation test, and reached 18 ppb, about 72% of the peak after about 60 minutes. This second confirmation test also confirmed that low humidity is suitable for gas generation, as in the first confirmation test. In addition, according to the generator 1, it is possible to generate a concentration of 2 ppb or more that is 10 times higher than the 2 ppb in which the deactivation of the virus has been confirmed in a room with an air volume of 25 m ³ and to control the gas concentration by the relative humidity of the space, which is safe and effective. It was confirmed that the virus could be inactivated in

In Example 1, the generator 1 equipped with the moisture release amount suppressing means will be described with reference to FIG. FIG. 1(A) shows a vertical sectional view of the generator, and FIG. 1(B) shows a horizontal sectional view taken along the line AA in FIG. 1(A). The generator 1 is a device having a hypochlorous acid gas generating structure.

The generator 1 consists of a main body 10, an inner lid 20 fitted above the main body, and an outer lid 30 having a gas discharge port 31 (see FIG. 1(A)). The main body 10 includes a hypochlorous acid water storage tank 11, an outer cylindrical wall 12 forming a double cylindrical wall, an air pressurization means 13, a hypochlorous acid water misting means 14, and a gas An inlet 15 and a gas path from the gas inlet to the inner lid are provided. An inner cylindrical wall 21 is suspended from the inner cover 20 .

The outer cylindrical wall 12 forming a double cylindrical wall is attached to four spacers 16 dispersedly disposed on the bottom plate of the storage tank so that the inner cylindrical wall 21 and the mist generating means 14 are coaxially arranged. It is placed and positioned (see FIG. 1(B)). The inner lid 20 includes an inner cylindrical wall 21 forming a double cylindrical wall, a gas passage for introducing outside air into the inner cylindrical wall 21, and a hanging wall 24 arranged in the gas passage downstream of the outer cylindrical wall 12. are provided (see FIG. 1(A)). The length by which the inner cylindrical wall 21 hangs is set to a length that allows a gap 23 forming a gas path between the inner cylindrical wall 21 and the water surface of the hypochlorous acid water.

When the inner lid is fitted above the main body, the inner cylindrical wall 21 suspended from the inner lid 20 and the outer cylindrical wall 12 erected from the reservoir 11 form a double cylindrical wall. When the outer lid 30 is placed on the inner lid 20, the inside of the inner cylindrical wall from the gas inlet 15, the gap 23 between the lower peripheral edge of the inner cylindrical wall and the hypochlorous acid water surface, and the double cylindrical wall A gas path is formed that reaches the gas discharge port 31 through the gap space 26 . The gas discharge port 31 is opened in the top surface of the outer lid and positioned outside the area of the outer cylindrical wall 12 (see FIG. 1).

When air is pressurized and induced from the gas inlet 15 by the air pressurizing means 13, the air is introduced through the gas path formed in the inner lid 20 into the inner space of the inner cylindrical wall 21 that generates mist. Air mixed with mist descends along the space. The pressurized mist and the outside air are lowered, and flow uniformly from the peripheral gap 23 between the bottom of the inner cylindrical wall and the water surface to the gap space 26 between the inner and outer cylindrical walls, and the gap space Ascend 26. At this time, the mist formed into droplets in the clearance space 26 adheres to the wall surface between the inner cylindrical wall and the outer cylindrical wall and is dropped and collected in the storage tank 11 .

The gas-phase mist and gas rise to the upper portion of the outer cylindrical wall 12, head toward the opening 27 of the inner lid, and are introduced through the opening 27 into the space between the inner and outer lids, where they exit the gas discharge port. 31 and is released into the space to be sterilized. While the mist is guided through the gas path by the pressurized air, hypochlorous acid in a liquid phase is dropped into the storage tank 11, and only the hypochlorous acid in a gaseous state reaches the gas outlet, As in the moisture release test described above, the amount of moisture released into the space to be sterilized is suppressed (see Table 3).

If the inner lid is provided with a hanging wall 24 that traverses the gas path, fine mist in a liquid state becomes droplets by the hanging wall 24 even outside the region of the outer cylindrical wall, and the storage tank 11 to be recovered. Although most of the mist in the liquid state is removed when it reaches the hanging wall 24, the provision of the hanging wall 24 can further suppress the amount of water generated.

The lower part of the storage tank 11 may be provided with a drive unit for the misting means 14 and as a storage place for the hypochlorous acid water tank 22 . Since the outer cylindrical wall 12 is placed on the spacer 16, and the hypochlorous acid water storage tank 11 is communicated between the inside and the outside of the outer cylindrical wall, drops that fall outside the outer cylindrical wall also enter the outer cylindrical wall. Droplets that have fallen are also collected in the storage tank 11 . Since the lower part of the outer cylindrical wall 12 is immersed in the reservoir 11, the disturbance of the water surface inside the outer cylindrical wall does not affect the area outside the outer cylindrical wall (Fig. 1A). (see diagram).

Also, the outer cylindrical wall 12 and the side wall 17 of the inner lid 20 are separated by a gap 25 through which gas can flow (see FIG. 1(B)). The hypochlorous acid mist guided from the gap space 26 between the double cylindrical walls to the side opposite to the gas discharge port 31 bypasses the gap 25 between the outer cylindrical wall 12 and the side wall 17 and is guided to the gas discharge port 31. be. The height of the outer cylindrical wall 12 is such that when the inner lid 20 is fitted to the main body 10, the inner lid 20 and the outer cylindrical wall 12 are separated from each other to form a gas passage.

As the air pressurizing means 13, a fan corresponding to the pressure loss caused by the filter may be selected so that the gas can be released even when a filter is attached to the gas outlet 31. is not limited, but a sirocco fan with a maximum blowing volume of 1.2 m ³ /min. According to this sirocco fan, the inside of the generator can be pressurized at a pressure of about 150 Pa, and gas can be discharged even if a double filter is attached.

The hypochlorous acid water misting means 14 is arranged coaxially with the double cylindrical wall, and is composed of a dispersing means 18, a cylindrical mesh body 19, and a driving part that rotates them integrally. The diffusing means 18 is a funnel whose cross-sectional area decreases toward the bottom. The lower end opening of the funnel is immersed in the storage tank 11, the upper end is closed with a lid member, and the liquid droplets scatter around the upper peripheral edge. The openings 28 are arranged radially. A radially protruding brim 29 is provided at the upper end of the funnel, and a cylindrical mesh 19 hangs down from the outer edge of the brim 29 .

The mesh body 19 is made of stainless steel and has a mesh diameter of about 1 mm. The dissipating means 18 and the mesh 19 are rotated integrally. When the dissipating means 18 and the mesh body 19 are rotated, the hypochlorous acid water is pumped up along the inner surface of the funnel body forming the dissipating means, is dispersed as droplets from the dispersing port 28, and is rotated. 19 will collide.

Since the hypochlorous acid mist is generated in the inner cylindrical wall 21 by the droplets collided with the mesh 19 and crushed, the hypochlorous acid mist can be generated efficiently. The hypochlorous acid water in the liquid phase state that did not become mist adheres to the wall surface of the inner cylindrical wall 21 due to the force of diffusion, drips down along the wall surface, and most of it falls into the storage tank 11 and is collected. be.

In Example 2, the gas outlet 31 of the generator is fitted with a filter 40 serving as a means for suppressing the amount of water released, and the gas outlet is provided with a gas diffusion means 41. The generator 2 is shown in FIGS. to explain. FIG. 9(A) shows the configuration thereof, and FIG. 9(B) shows an enlarged view of a non-woven fabric filter that constitutes the first moisture release suppressing means. In FIG. 9, in order to facilitate understanding, only the filter 40 and the gas diffusion means 41 are indicated by solid lines, and other configurations of the generator are indicated by broken lines.

FIG. 10 shows another aspect of the filter. FIG. 10(A) shows a nanofilter 50 forming the second moisture release suppressing means, and FIGS. shows a filter for FIG. 11(A) shows a photograph of the upstream surface of the non-woven fabric filter 40 in the embodiment of FIG. 9(A), and FIG. 11(B) shows a photograph of the upstream surface of the nanofilter 50 of FIG. 10(A). A magnified photo is shown.

The generator 2 may be fitted with any type of filter at the gas outlet depending on the performance of the air pressurizing means. When the filter is attached, the speed of gas discharge from the gas discharge port is reduced and the gas is retained near or at a low position. Therefore, a fan serving as a gas diffusion means is provided along the filter surface of the gas discharge port. , the gas is diffused in a short time over a wide range of the space to be sterilized.

By air-tightly attaching the filter of either aspect to the gas discharge port with a rubber packing 42 or the like, the gas passes only through the filter portion and is discharged into the sterilization target space. When the filter is attached, the pressure inside the device increases, and hypochlorous acid may leak from the boundary between the main body, the inner lid, and the outer lid. should be airtight (see FIG. 9(A)).

The first water release amount suppressing means (see FIG. 9(B)) is a non-woven fabric filter that has undergone water-repellent treatment equivalent to that of a non-woven fabric mask worn by a person. Specifically, the fibers forming the filter have a fiber diameter of 1 μm or more and 6 μm or less and a pressure loss of about 30 Pa. In this case, the non-woven fabric filter is not bent and is attached to the gas discharge port 31 in a flat state so that the hypochlorous acid mist does not leak. For example, a rubber packing 42 or the like may be provided around the filter and brought into close contact with the gas discharge port to ensure airtightness.

The material of the fiber forming the filter may be polypropylene resin fiber, polyester resin fiber, polyurethane resin fiber, or mixed resin fiber of these, but is not limited. The manufacturing method of the non-woven fabric filter is not limited as long as it is water-repellent, and may be, for example, a meltblown manufacturing method, a spunbond manufacturing method, or the like.

When the nonwoven fabric filter was attached to the generator and the generator was operated continuously for 6 hours, the entire upstream surface of the nonwoven fabric filter was wet (see Fig. 11 (A)). The downstream surface of the nonwoven fabric filter was not wet. As shown in the moisture release test, the amount of released water was suppressed, and gas was generated as shown in the gas generation test. The pressure loss of the filter should be 20 Pa or more and 60 Pa or less, the fiber diameter of the filter should be 1 μm or more and 30 μm or less, and the mask need not necessarily be a non-woven fabric mask worn by people.

The second water release amount suppressing means (see FIG. 10A) is a hydrophobic nanofilter having a fiber diameter of 70 nm or more and 200 nm or less and a pressure loss of 20 Pa or more and less than 60 Pa. The surface is bent once at the central portion so as to form a downwardly convex inclined surface (see FIG. 10(A)). The nanofilter is a three-layer structure nanofilter 50 composed of a three-dimensional mesh layer 51 in which nanofibers are densely packed and thin nonwoven fabric layers 52 forming shape-retaining layers on both sides.

The mist that forms droplets on the upstream surface due to long-term continuous operation gathers in the center along the inclined surface and drops into the storage tank 11 to be collected. When the nanofilter was attached to the generator and it was operated continuously for 6 hours, the mist that did not pass through the upstream surface of the nanofilter adhered to the upstream surface of the nanofilter as fine droplets a, and the large droplets were dropped (Fig. 11). (B), as shown in the moisture release test, the moisture release amount was suppressed. Note that the downstream surface was not wet.

The third moisture release suppressing means (see FIGS. 10B and 10C) is a double filter composed of nonwoven fabric filters 61 and 62 and a nanofilter 50, and the space between the filters is A space 63 separated by 5 mm or more is provided. In the double filter, the non-woven fabric filters 61 and 62 are inclined and attached to the frame so that the upstream surface is an inclined surface. When using a flat nonwoven fabric filter 61, the entire nonwoven fabric filter may be inclined (see FIG. 10(B)). In this case, droplets adhering to the nonwoven fabric gather at the peripheral edge along the inclined surface and quickly drop.

In the case of using a nonwoven fabric filter 62 bent in a bellows shape, streak-like valley folds are formed on the upstream surface, and droplets adhering to the nonwoven fabric gather in the valley folds and fall (Fig. 10(C)). ). In either case, the interior of the non-woven fabric filter is not easily wetted. It should be noted that even if mist having a particle size that passes through the non-woven fabric filter, or when the upstream side of the non-woven filter gets wet, even if water fine particles are blown into the downstream side by ventilation, they are likely to be vaporized in the space 63 between the non-woven fabric filter and the nanofilter. , the nanofilter is kept dry.

In Example 3, a building 5 in which an air conditioning system 4 having a hypochlorous acid gas generating structure is installed in the air conditioning path of each floor will be described with reference to FIG. FIG. 12A shows an explanatory diagram explaining the configuration of the air conditioning system 4, and FIG. 12B shows an explanatory diagram of the building 5. FIG. Since the configuration of the hypochlorous acid gas generating structure is the same as that of the hypochlorous acid gas generator of Example 1, in FIG. will be given the same reference numerals and will be briefly described.

The air conditioning system 4 is provided in an air conditioning path 80 that introduces outside air and distributes it to living rooms. The air-conditioning system 4 in the range enclosed by the dashed line in FIG. 12(A) may be provided. Chlorous acid water may be used, and hypochlorous acid water may be directly supplied.

The air conditioning system 4 introduces air by branching a part from the main air conditioning path 80, introduces the air pressurized by the air pressurizing means 13 into the inner cylindrical wall 21, and rotates in the inner cylindrical wall 21. A fine hypochlorous acid mist is generated by a misting means 14 consisting of a cylindrical mesh body and hypochlorous acid water diffusion means, and the space in the inner cylindrical wall 21 is filled with the air and the mist. After the hypochlorous acid is lowered once, the hypochlorous acid in the gaseous state is raised in the gap space 26 between the inner cylindrical wall and the outer cylindrical wall 12 .

After recovering the mist that becomes droplets in the space in the inner cylindrical wall 21, the gas outlet provided in the upper part outside the area of the outer cylindrical wall 12 where droplets do not occur from the water surface of the hypochlorous acid water storage tank 11. From the outlet 83, mist of hypochlorous acid water and hypochlorous acid gas in gaseous state are supplied to the main air conditioning path 80. - 特許庁The hypochlorous acid gas supplied to the main air-conditioning route is combined with air whose temperature and humidity have been adjusted in advance, and is supplied to the living room.

Hypochlorous acid gas has a different half-life cycle depending on humidity. is preferably generated and supplied, but is not limited thereto. The space where people stay in building 5 is divided into areas where hypochlorous acid gas with a concentration that can utilize the virus deactivation effect can be supplied according to the period of the half-life cycle according to the humidity, and air conditioning is performed. The system 4 should be provided.

In the building 5, each floor is equipped with an air conditioning system 4 for easy understanding (see FIG. 12(B)). If the air-conditioned area of one floor is large, it is preferable to equip one floor with a plurality of air-conditioning systems. By supplying hypochlorous acid gas in a humidity environment with a relative humidity of 30% to 60% by the air conditioning system 4, the generation of fungal mold is suppressed, and the virus deactivation effect, deodorizing effect, and sterilization effect are also achieved. I can expect it. The air conditioning system 4 can be applied not only to large offices but also to buildings having many rooms for the elderly, and can provide building users with a comfortable and safe space.

(others)
"ppm" for gases is in parts per million by volume, "ppm" for liquids is in parts per million by mass, and "ppb" for gases is in parts per billion by volume. be.
・In the generator, an example of using pre-generated hypochlorous acid water was explained, but an electrolysis means may be provided to electrolyze the sodium chloride aqueous solution to generate hypochlorous acid water. It goes without saying.
- The embodiments disclosed this time are illustrative in all respects and should be considered not restrictive. The technical scope of the present invention is not limited to the above description, but is intended to include all modifications within the meaning and scope of equivalents to the claims.

1, 2... Hypochlorous acid gas generator, 4... Air conditioning system, 5... Building,
DESCRIPTION OF SYMBOLS 100... Filter, 110... Copper fiber, 200... Rod body, 210... Copper fiber,
300... Hood portion, 310... Copper fiber a, 320... Copper fiber b,
330... tissue paper,
DESCRIPTION OF SYMBOLS 10... Main-body part, 11... Storage tank, 12... Outer cylindrical wall, 13... Air pressurization means,
14...Misting means, 15...Gas introduction port, 16...Spacer, 17...Side wall,
18... Diffusion means, 19... Net body,
20... Inner lid, 21... Inner cylindrical wall, 22... Hypochlorous acid water tank, 23... Gap,
24... Hanging wall, 25... Gap, 26... Gap space, 27... Opening hole, 28... Radiation port,
29... brim portion, 30... outer lid, 31... gas discharge port,
40... Filter, 41... Gas diffusion means, 42... Packing,
50... Nanofilter, 51... Three-dimensional network layer, 52... Non-woven fabric,
61...Nonwoven fabric filter, 62...Nonwoven fabric filter, 63...Space,
80... Air-conditioning route, 81... Supply route, 82... Hypochlorous acid generator, 83... Gas discharge port

Claims

In the hypochlorous acid gas generating structure that generates only hypochlorous acid in the gas phase state,
The hypochlorous acid gas generating structure includes a hypochlorous acid water storage tank, a double cylindrical wall, a gas path, an air pressurization means, a hypochlorous acid water misting means, and a gas discharge. including an exit and
The outer cylindrical wall forming a double cylindrical wall is erected from the storage tank and the lower part is immersed in hypochlorous acid water,
an inner cylindrical wall forming a double cylindrical wall is suspended so as to provide a gap between its lower periphery and the hypochlorous acid water surface of the reservoir, and the interior of the inner cylindrical wall serves as a gas passage;
The storage tank penetrates inside and outside the outer cylindrical wall,
The air pressurizing means pressurizes and guides external air from the gas introduction port to the gas discharge port through the interior of the inner cylindrical wall,
The misting means comprises a cylindrical net body and hypochlorous acid water dispersing means,
the mesh is rotated concentrically with the double cylindrical wall;
The diffusing means causes hypochlorous acid water to collide with the mesh inside the inner cylindrical wall to generate mist,
Hypochlorous acid water in a liquid phase is dropped and collected in the storage tank inside the inner cylindrical wall,
the mist in the gas phase state rises by being guided from the periphery of the gap to the gap space formed by the double cylindrical walls;
While the mist is rising, the mist that has become droplets in the gap space is dropped and collected in the storage tank in the area of the gap space,
The gas outlet is provided at the top outside the area of the outer cylindrical wall,
From the gas outlet, only mist and hypochlorous acid gas in a gaseous state are released,
A hypochlorous acid gas generating structure characterized by:
In the hypochlorous acid gas generator,
A hypochlorous acid gas generator that generates only hypochlorous acid in a gaseous state,
Equipped with the hypochlorous acid gas generating structure according to claim 1,
A hypochlorous acid gas generator characterized by:
A first moisture release suppressing means can be attached to the gas outlet, and the gas path from the gas introduction port to the gas outlet is airtight,
The first water release amount suppressing means is a non-woven fabric filter having a fiber diameter of 1 μm or more and 30 μm or less and a pressure loss of 20 Pa or more and 60 Pa or less, and having water repellency.
The hypochlorous acid gas generator according to claim 2, characterized in that:
A second moisture release suppressing means can be attached to the gas discharge port, and a portion from the gas introduction port of the gas path to the gas discharge port is airtight,
The second water release amount suppressing means is a nanofilter containing hydrophobic nanofibers having a fiber diameter of 70 nm or more and 200 nm or less and having a pressure loss of 20 Pa or more and 60 Pa or less.
The hypochlorous acid gas generator according to claim 2, characterized in that:
A third means for suppressing the amount of water released can be attached to the gas outlet, and a portion from the gas introduction port of the gas path to the gas outlet is airtight,
The third water release amount suppressing means comprises, from the upstream side, a water-repellent nonwoven fabric filter having a fiber diameter of 1 μm or more and 30 μm or less and a pressure loss of 20 Pa or more and 60 Pa or less, and a hydrophobic fiber having a fiber diameter of 70 nm or more and 200 nm or less. A double filter consisting of a nanofilter containing a soluble nanofiber and having a pressure loss of 20 Pa or more and 60 Pa or less, and the space between the double filters is at least 5 mm or more.
The hypochlorous acid gas generator according to claim 2, characterized in that:
an upstream surface of the moisture release suppressing means attached to the gas outlet forms an inclined surface,
the mist droplets on the upstream surface fall into the storage tank along the inclined surface;
The hypochlorous acid gas generator according to any one of claims 3 to 5, characterized in that:
A gas diffusion means for generating an airflow is provided outside the gas outlet,
The gas diffusion means diffuses the hypochlorous acid gas released from the gas outlet,
The hypochlorous acid gas generator according to any one of claims 3 to 5, characterized in that:
In the air conditioning system,
An air conditioning system that generates and supplies only hypochlorous acid in a gaseous state to a room,
Equipping an air conditioning route with the hypochlorous acid gas generating structure according to claim 1,
Only the vapor phase mist and hypochlorous acid gas are introduced into the fresh air introduction route into the room and supplied.
An air conditioning system characterized by:
In a building where the air conditioning area is divided into multiple compartments,
The air conditioning system according to claim 8, which generates only hypochlorous acid in a gas phase state, is provided for each section where people stay,
A building characterized by