JP2024013685A - Air cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air cleaner that prevents ultraviolet ray in an amount harmful to a human body leaking into a space where a human being enters, and can reduce a lot of number of pathogenic organisms in a short time.

SOLUTION: An air cleaner 100 irradiates pathogens CV in the air with ultraviolet rays to reduce the number of pathogens. The air cleaner 100 includes a ventilation path 1 through which air passes, an ultraviolet light source 2, and a shielding body 4. The ultraviolet light source 2 irradiates ultraviolet light UV from an inner surface of a wall 11 of the ventilation passage 1 to the other inner surface of the wall 11 of the ventilation passage 1. The shielding body 4 receives and absorbs ultraviolet rays directed outside the irradiation area UA of ultraviolet rays UV and allows airflow to pass therethrough.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

Patent Act Article 30, Paragraph 2 application filed.Sold on August 27, 2021.Sold on January 26, 2020.Sold on January 27, 2020.Sold on March 23, 2020. Sales: Sold on March 24, 2020. Sold on March 28, 2020. Sold on April 23, 2020. Sold on April 25, 2020. On April 26, 2020. Sales: Sold on May 28, 2020. Sold on July 6, 2020. Exhibited at Tokushima Prefecture Comprehensive Disaster Prevention Drill on September 1, 2021. From December 8, 2021 to 2021. Exhibited at the Hikari and Infectious Disease Control Expo on December 10th Exhibited at the 2022 Air and Mirai EXPO from March 15, 2020 to March 16, 2020 Exhibited at the 2022 Air and Mirai EXPO Exhibition from July 17, 2020 Published at the academic meeting of the Japanese Society of Clinical Orthopedics on July 18, 2021 Exhibited at the Hitachi Zosen Corporation Chikko Factory from September 28, 2021 At the Nanko Head Office of Hitachi Zosen Corporation from July 1, 2021 exhibition

The present invention relates to an air purifying device that purifies the air by irradiating pathogens floating in the air with ultraviolet rays to kill them and reduce their number.

Pathogens are suspended in the air that people breathe. When people inhale more than a certain number of pathogens, they develop symptoms of the disease. Symptoms of diseases are undesirable because they interfere with people's comfortable lives. Therefore, in order for people to live a comfortable life without developing diseases, it is necessary to reduce the number of pathogens floating in the air.

Pathogens floating in the air are killed by UV irradiation and their numbers are reduced. Therefore, air purification devices are used that purify the air by irradiating pathogens floating in the air with ultraviolet rays to reduce the number of pathogens to a level where people do not develop symptoms of the disease. There is. Air purifiers introduce pathogens floating in the air around the air purifier along with the air to a ventilation path inside the device, irradiate the pathogens with ultraviolet light in the ventilation path to kill and reduce the pathogens, and then remove the pathogens from the air. It is also discharged to the outside of the air purifier. If this reduces the number of pathogens floating around the air purification device, the space will become a comfortable space where people are less likely to get sick.

By the way, when the human body is irradiated with ultraviolet rays of a certain amount or more, injuries such as burns occur in the areas irradiated with the ultraviolet rays. Therefore, the air purifying device must not leak ultraviolet rays in an amount harmful to the human body into a space where people enter. The air purifying devices disclosed in Patent Documents 1 to 3 cover the ultraviolet light source with a member that blocks ultraviolet rays (shading member), thereby preventing the amount of ultraviolet rays harmful to the human body from leaking into spaces where people enter. is prevented.

Japanese Patent Application Publication No. 11-63592 Japanese Patent Application Publication No. 8-312977 Japanese Patent Application Publication No. 9-141054

However, the air cleaning devices disclosed in Patent Documents 1 to 3 are arranged such that the light shielding member, the ultraviolet light source, or both of them block a part of the ventilation path. Therefore, the light shielding member or the ultraviolet light source obstructs the airflow passing through the ventilation duct, which increases the amount of airflow passing through the ventilation duct, as well as pathogens that are carried by the airflow and move within the ventilation duct and are irradiated with ultraviolet rays. There was a problem that the number of pathogens decreased and it was not possible to reduce a large number of pathogens in a short time.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an air purifying device that can prevent a harmful amount of ultraviolet rays from leaking into a space where people enter, and can also reduce a large number of pathogens in a short time. shall be.

The air purifying device of the present invention includes a ventilation passage through which air passes, an ultraviolet light source that irradiates ultraviolet rays from an inner surface side of a wall of the ventilation passage toward another inner surface of the wall of the ventilation passage, and an ultraviolet light source that irradiates an ultraviolet ray irradiation area. It is characterized by comprising a shielding body that receives and absorbs the ultraviolet rays directed to the outside and allows airflow to pass through.

According to the air purifying device of the present invention, it is possible to prevent a harmful amount of ultraviolet rays from leaking into a space where people enter, and to reduce a large number of pathogens in a short time.

1 is a longitudinal cross-sectional view showing an air cleaning device according to a first embodiment. 1 is a cross-sectional view showing an air cleaning device according to Embodiment 1. FIG. 1 is a vertical cross-sectional view of the air purifying device according to Embodiment 1, and is an enlarged view of an outlet portion of a ventilation passage. FIG. 7 is a vertical cross-sectional view showing Modification 1 of the air purifying device according to Embodiment 1, and is an enlarged view of the ventilation passage outlet portion. FIG. 7 is a side view showing a second modification of the air purifying device according to the first embodiment. FIG. 7 is a side view showing a third modification of the air purifying device according to the first embodiment. It is a longitudinal sectional view showing modification 4 of the air purifying device according to Embodiment 1, and is an enlarged view of the ventilation passage outlet portion. 7 is a cross-sectional view showing a fifth modification of the air purifying device according to the first embodiment. FIG. FIG. 3 is a vertical cross-sectional view of the air purifying device according to Embodiment 2, and is an enlarged view of the ventilation passage outlet. It is a longitudinal sectional view showing modification 1 of the air purifying device according to Embodiment 2, and is an enlarged view of the ventilation passage outlet. FIG. 7 is a vertical cross-sectional view showing a second modification of the air purifying device according to the second embodiment, and is an enlarged view of the ventilation passage outlet. It is a longitudinal sectional view showing modification 3 of the air cleaning device according to Embodiment 2, and is an enlarged view of the ventilation passage outlet. FIG. 7 is a longitudinal cross-sectional view showing an air cleaning device according to a third embodiment. FIG. 7 is a longitudinal cross-sectional view showing an air cleaner according to Embodiment 5. FIG. 7 is a cross-sectional view showing an air cleaner according to Embodiment 5. 7 is a graph showing the relationship between the shielding ratio of the shielding body and the amount of airflow passing through the ventilation path in the air cleaner according to the fifth embodiment.

[Embodiment 1]
Hereinafter, an outline of an air purifying device 100 according to Embodiment 1 of the present invention will be described with reference to FIG. 1.

The air purification device 100 shown in FIG. to be discharged. Pathogens CV floating around the air purifying device 100 are carried by air currents F such as wind generated by a device such as a fan (not shown) or naturally occurring wind, and move around the air purifying device 100. pass through the interior of. Since the air purifying device 100 kills and discharges the surrounding pathogen CV, the number of pathogen CV floating around the air purifying device 100 is reduced. The fewer the number of pathogenic CVs floating around people, the lower the probability that people will contract the disease. Therefore, the air purifying device 100 creates an environment in which people are less likely to contract diseases by reducing the number of pathogens CV around the air purifying device 100.

On the other hand, the ultraviolet rays irradiated inside the air purifier 100 also pass through the space 90 through which the air flow F passes, and head toward the outside of the air purifier 100. Conventional air purifiers have a structure in which a member that obstructs the air flow is installed in the space where the air flow passes in order to prevent ultraviolet rays from leaking outside the air purifier through the space where the air flow passes. was. The member that obstructs the air flow is specifically a plate structural member. The plate structural member is placed in a space through which the airflow passes so that its wide surface receives the airflow. The airflow passing through the interior of the air purifying device is obstructed by the above-mentioned member, thereby reducing the amount of airflow per hour. As a result, the number of pathogens moving through the airflow space per hour also decreases, making it impossible to irradiate a large number of pathogens with ultraviolet light in a short period of time.

In the air purifying device 100, the shielding body 4 has a hollow structure in order to prevent a harmful amount of ultraviolet rays from leaking into a space where people enter through the shielding body 4, and to reduce a large number of pathogens CV in a short time. It has become. Since the shielding body 4 has a hollow structure, the airflow F can pass through the hollow portion of the shielding body 4, unlike a member that obstructs airflow, such as a conventional plate structural member.

On the other hand, although the hollow shield 4 allows air to pass through easily, there is a risk that ultraviolet rays harmful to the human body may leak through the hollow portion. For this purpose, the ultraviolet light source 2 and the shielding body 4 are arranged so that the ultraviolet light UV emitted by the ultraviolet light source 2 and the reflected ultraviolet UV are irradiated onto the portion of the shielding body 4 that receives the ultraviolet UV. .

Moreover, the ultraviolet light source 2 that irradiates ultraviolet rays UV is provided at a position that does not obstruct the airflow F, as will be described later, and there is no structure other than the shield 4 in the space 90 through which the airflow F passes. Therefore, the air purifying device 100 can allow a larger amount of air flow F to pass through than before. Therefore, the air purifying device 100 can irradiate a larger number of pathogens CV with ultraviolet rays than in the past. Therefore, the air purifying device 100 can kill a larger number of pathogens CV in a short time and reduce the number of pathogens CV.

The details of the structure of the air purifying device 100 of Embodiment 1 will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the air purifying device 100 includes a ventilation passage 1, and the ventilation passage 1 includes an ultraviolet light source 2, a reflector 3, and a shielding body 4.

The ventilation passage 1 is a structure in which a space 90 through which an air flow F passes is surrounded by a wall 11, and has a ventilation passage entrance 12 and a ventilation passage exit 13 that communicate the inside of the ventilation passage 1 and the outside of the ventilation passage 1. The ventilation passage inlet 12 is an opening provided in the ventilation passage 1 so that the air flow F outside the ventilation passage 1 enters inside the ventilation passage 1, and the ventilation passage exit 13 is an opening provided in the ventilation passage 1 so that the air flow F inside the ventilation passage 1 enters the inside of the ventilation passage 1. 1 This is an opening provided in the ventilation passage 1 for exiting to the outside. The shape of the ventilation passage 1 is a rectangular tube shape with a quadrangular cross section as shown in FIGS. It may also be a rectangular tube or a cylinder that is bent in the middle. As the material for the wall 11 of the ventilation passage 1, a steel plate, a stainless steel plate, or glass wool, which has been surface-treated with galvanizing or other plating or coating with a resin such as polyvinyl chloride, is used. Note that the resin deteriorates when it is irradiated with ultraviolet rays. For this reason, if the wall 11 of the ventilation passage 1 is manufactured from a material containing resin, the parts of the wall 11 of the ventilation passage 1 that are irradiated with ultraviolet rays should be coated with a light-resistant paint or do not contain resin. It is necessary to protect the wall 11 of the ventilation passage 1 from ultraviolet rays by covering it with a material or the like.

The ultraviolet light source 2 shown in FIGS. 1 and 2 is a light source that emits ultraviolet UV. The ultraviolet light UV emitted by the ultraviolet light source 2 kills the pathogen CV by damaging its genes, for example. The ultraviolet light source 2 can emit ultraviolet rays of various wavelengths, such as deep ultraviolet rays. When selecting the wavelength of the ultraviolet light UV emitted by the ultraviolet light source 2, conditions such as the installation environment of the air cleaning device 100 are taken into consideration. As the ultraviolet light source 2, for example, a light emitting diode, a mercury lamp, a plasma light emitter, or the like can be used.

The ultraviolet light source 2 is provided on one inner surface of the wall 11 of the ventilation passage 1 and irradiates the other inner surface of the wall 11 of the ventilation passage 1 with ultraviolet light. As a result, the inside of the ventilation passage 1 is irradiated with ultraviolet rays. Providing the ultraviolet light source 2 on the inner surface side of the ventilation passage 1 means that the ultraviolet light source 2 is provided on the inner surface side of the ventilation passage 1 so that a part of the ultraviolet light source 2 protrudes from the inner surface of the wall 11 toward the inside of the ventilation passage 1, as shown in FIGS. This means that the light source 2 is provided on the wall 11 of the ventilation passage 1. In addition, the ultraviolet light source 2 is provided on the inner surface of the wall 11 of the ventilation passage 1 so as to be in contact with the inside of the ventilation passage 1, and the ultraviolet light source 2 is located in a recessed position on the wall 11 of the ventilation passage 1 from the inside of the ventilation passage 1 toward the outside. The ultraviolet light source 2 is held by a holding part such as a bracket that holds the ultraviolet light source 2, and the holding part is attached to the wall 11 of the ventilation passage 1 so that the ultraviolet light source 2 is placed inside the ventilation passage 1. It also includes providing. The ultraviolet light source 2 shown in FIGS. 1 and 2 irradiates ultraviolet light UV toward a wall opposite to the wall on which the ultraviolet light source 2 is provided. In addition to FIGS. 1 and 2, for example, the ultraviolet light source 2 may be provided so as to irradiate ultraviolet light toward a wall of the wall 11 that intersects with the wall on which the ultraviolet light source 2 is provided.

The reflector 3 is provided in the ventilation passage 1 so that the ultraviolet rays UV are irradiated onto a preset area to be irradiated with the ultraviolet rays (UV irradiation area UA). Specifically, the reflector 3 is provided on the inner surface of the wall 11 of the ventilation passage 1 and reflects the ultraviolet light UV from the ultraviolet light source 2. For example, the reflector 3 is a plate made of metal such as aluminum or iron and has a mirror surface, or a plate made of fluororesin or silicone resin. Furthermore, if the wall 11 of the ventilation passage 1 is made of metal such as aluminum or iron, the inner surface of the wall 11 of the ventilation passage 1 can be mirror-finished to form the reflector 3. can do. Furthermore, the reflector 3 may be configured by subjecting the inner surface of the wall 11 of the ventilation passage 1 to a surface treatment such as coating with a fluororesin, silicone, or the like that reflects light such as ultraviolet rays. Note that, as long as the ultraviolet light source 2 can irradiate the entire UV irradiation area UA with ultraviolet rays, the reflector 3 does not necessarily have to be provided in the ventilation path 1.

As shown in FIG. 1, the shielding body 4 is a boundary separating the inside and outside of the ultraviolet ray UV irradiation area UA, and is a space where people can enter from the ultraviolet ray UV irradiation area UA and/or parts that deteriorate due to ultraviolet rays UV. It is installed in a space through which ultraviolet rays pass toward the space in which it is placed. Specifically, the shield 4 shown in FIG. 1 is provided at the ventilation passage entrance 12 and the ventilation passage exit 13. Therefore, the shielding body 4 receives the ultraviolet rays that go from the inside of the ventilation duct 1 to the outside of the ventilation duct 1 through the ventilation duct entrance 12 or the ventilation duct exit 13, and absorbs the ultraviolet rays, thereby reducing the amount of ultraviolet rays that are harmful to the human body. It is possible to prevent UV from leaking to the outside of the ventilation passage 1, which is outside the UV irradiation area UA. Note that the shield 4 shown in FIG. 1 is provided at the ventilation duct entrance 12 and the ventilation duct exit 13, but if it can receive the ultraviolet rays directed outside the irradiation area UA of the ultraviolet rays, it can be placed at any position. It may be provided. For example, the shield 4 may be provided at a position outside the ventilation passage 1 or inside the ventilation passage 1 with respect to the ventilation passage entrance 12 and the ventilation passage exit 13.

The shielding body 4 is a structure that receives ultraviolet rays UV and has an air passage AP (see FIG. 3, etc.) through which the air flow F passes. The shield 4 includes a louver made up of a plurality of blades 40 as shown in FIG. When the shielding body 4 is a louver, the air passage AP is a space between each wing plate 40 that constitutes the louver, and is a space that connects the inside of the ventilation passage 1 and the outside of the ventilation passage 1. A part of the ultraviolet rays UV irradiated inside the ventilation passage 1 heads toward the shield 4, passes through the air passage AP of the shield 4, and tries to exit to the outside of the ventilation passage 1. Each wing plate 40 constituting the shielding body 4 receives ultraviolet rays UV that are about to pass through the air passage AP.

The slats 40 absorb the ultraviolet rays UV received by the slats 40 so that the amount of ultraviolet rays UV that is about to pass through the air passage AP is below a reference amount when passing through the air passage AP. In order to absorb the received ultraviolet rays, the wing plate 40 may be coated with a paint having a high absorption rate of ultraviolet rays such as fluorine-based paint, silicone-based paint, or acrylic paint, or coated with a material that absorbs ultraviolet rays such as black alumite. It is made by plating the surface with a high absorption rate, or by applying a surface treatment with fine irregularities for the purpose of diffusely reflecting ultraviolet rays. The feather board 40 made in this way has a level below the standard amount determined in consideration of the illuminance of ultraviolet rays that cause injury to the human body, as listed in Table 3 of JIS-C-7550-2014. It absorbs the UV rays it receives. Note that the reference amount of ultraviolet rays UV when passing through the air passage AP may be determined in consideration of the country or region where the air purifier 100 is used. For example, it may be determined in accordance with guidelines established by the Japan Lighting Industry Association, etc.

The shielding body 4 may have a structure in which the ultraviolet rays UV that are not received by the wing board 40 are reflected, and are received by a different wing board 40 and absorbed so that the amount is below the reference amount. Specifically, as shown in FIG. 3, each wing plate 40 is arranged along the direction of the air flow F so that the ultraviolet rays can be reflected as many times as the ultraviolet rays can be absorbed until the ultraviolet rays become below the reference amount. The length of the blades 40 in the direction and the interval at which each blade 40 is provided are determined. The shielding body 4, which has a structure that receives and reflects ultraviolet rays multiple times, is made of cheaper paint, materials, or It has the advantage that it can be made by surface treatment.

The operation of the air purifying device 100 of Embodiment 1 will be described with reference to FIGS. 1 to 3.

As shown in FIGS. 1 and 2, the ultraviolet light source 2 emits ultraviolet light UV inside the ventilation passage 1, and forms an ultraviolet UV irradiation area UA. The ultraviolet ray UV irradiation area UA includes an area where the ultraviolet rays UV emitted by the ultraviolet light source 2 reach, and an area where the ultraviolet rays UV reflected by the reflector 3 reach. Pathogens CV are irradiated with ultraviolet rays by passing through the ultraviolet rays UV irradiation area UA and are killed, thereby reducing their number.

As shown in FIG. 1, the blades 40 of the shielding body 4 provided at the air passage inlet 12 and the air passage outlet 13 receive a certain amount of ultraviolet rays that are about to pass through the air passage AP shown in FIG. Absorbs UV rays. The ultraviolet rays received by the blades 40 but not completely absorbed are reflected by the blades 40. In FIG. 3, the ultraviolet rays UV passing through the air passage AP are reflected at least twice due to the structure of the wing plate 40. Specifically, the ultraviolet ray UV1 that is once received by the blade 40 and reflected without being completely absorbed is received once again by a different blade 40, absorbed, and reflected. After being reflected twice, the ultraviolet light UV2 becomes less than the reference amount, and only the ultraviolet light UV2 that is less than the reference amount passes through the ventilation passage 1. Therefore, the shield 4 prevents ultraviolet rays harmful to the human body from leaking to the outside of the ventilation passage 1.

On the other hand, the pathogen CV floating in the air around the air purifier 100 is carried by the air flow F toward the inside of the ventilation passage 1 and moves to the air passage AP of the shield 4 provided at the entrance 12 of the ventilation passage. It passes through and enters the inside of ventilation passage 1.

The pathogen CV that has entered inside the ventilation passage 1 is carried by the air flow F so as to pass through the ultraviolet ray UV irradiation area UA, and is irradiated with ultraviolet rays UV. Inside the ventilation passage 1, an ultraviolet light source 2 is provided on the inner surface side of the ventilation passage 1, and the ultraviolet light source 2 is provided on the inner surface side of the ventilation passage 1. Since the portion where the ultraviolet light source 2 enters the inside of the ventilation path 1 is small, the airflow F is unlikely to be obstructed by the portion where the ultraviolet light source 2 enters the inside of the ventilation path 1. Therefore, a larger amount of airflow F can pass through the inside of the ventilation passage 1 per hour than in the past. The larger the amount of air flow F passing through the ventilation passage 1, the greater the number of pathogen CVs carried by the air flow F. Therefore, a larger number of pathogen CVs are carried to the ultraviolet UV irradiation area UA than before. It will be done. Therefore, a greater number of pathogen CVs than conventionally are irradiated with ultraviolet UV and killed. In other words, the number of pathogens reduced per hour is greater than before.

The pathogen CV killed in the ultraviolet UV irradiation area UA passes through the ventilation passage 1 of the shield 4 provided at the ventilation passage outlet 13 together with the air flow F and is discharged to the outside of the ventilation passage 1. The number of pathogen CVs that the air purifier 100 kills increases and the number of pathogen CVs floating around the air purifier 100 decreases, creating an environment around the air purifier 100 in which people are less likely to contract diseases. be done. As mentioned above, the air purification device 100 can reduce a greater number of pathogen CVs per hour than conventionally. Therefore, the air purifying device 100 can create an environment around the air purifying device 100 in which people are less likely to get sick in a shorter time.

Below, structures of Modifications 1 to 4 of the air purifying device 100 according to Embodiment 1 will be described with reference to FIGS. 4 to 7. In the air purifying apparatuses 100 of Modifications 1 to 4 of the air purifying apparatus 100 according to the first embodiment, the structure of the shielding body 4 is different from the shielding body 4 shown in FIG. 3 . Therefore, the structure of each shielding body 4 will be described in Modifications 1 to 4 of the air purifying device 100 according to the first embodiment. Since the parts other than the shield 4 have been described with reference to FIGS. 1 to 3, their description will be omitted.

[Modification 1 of Embodiment 1]
As shown in FIG. 4, the shielding body 4 of Modification 1 is a louver having a wing plate 40 of a different shape from that of the shielding body 4 of FIG. The blade 40 of the shielding body 4 in FIG. 4 has a shape in which the downstream side from an arbitrary position in the longitudinal direction of the ventilation passage 1 is bent in the width direction of the ventilation passage 1.

[Modification 2 of Embodiment 1]
As shown in FIG. 5, the shielding body 4 of Modification 2 has a lattice shape. In the shielding body 4 of FIG. 5, the spaces provided between the respective frames 44 constituting the lattice serve as air passages AP.

[Modification 3 of Embodiment 1]
As shown in FIG. 6, the shielding body 4 of Modification 3 is a porous body. Specifically, the shielding body 4 shown in FIG. 6 is a honeycomb structure. In the shielding body 4 of FIG. 6, the hollow portion of each cell 45 of the honeycomb structure serves as an air passage AP.

[Modification 4 of Embodiment 1]
As shown in FIG. 7, the shield 4 of Modification 4 is a member (enclosing member 46) provided to surround the inside of the ventilation path 1 or a part of the inside of the ventilation path 1. In the shielding body 4 of FIG. 7, an enclosing member 46 surrounds the inside of the ventilation passage 1, and a space surrounded by the enclosing member 46 serves as an air passage AP. The surrounding member 46 includes a member different from the wall 11 of the ventilation passage 1, or a wall 11 of the ventilation passage 1 that has been subjected to a surface treatment that absorbs ultraviolet rays.

[Modification 5 of Embodiment 1]
The structure of modification 5 will be described below with reference to FIG. 8. The air purifying device 100 of Modification 5 differs from the air purifying device 100 shown in FIG. 2 in that ultraviolet light sources 2 are provided on at least one or more walls 11 exhibiting a cross-sectional structure of the ventilation passage 1, respectively. The ultraviolet light sources 2 of the air purifying device 100 shown in FIG. 8 are provided on two different walls of the walls 11 forming the ventilation path 1. Specifically, one ultraviolet light source 2 is provided on a wall that intersects with the wall on which the other ultraviolet light source 2 is provided. Note that in the air purifying device 100 shown in FIG. 8, one ultraviolet light source 2 is provided on a wall that intersects with the wall on which the other ultraviolet light source 2 is provided; It may be provided on a wall opposite to the wall where No. 2 is provided. Further, a plurality of ultraviolet light sources 2 may be provided at different positions on one wall. For example, a plurality of ultraviolet light sources 2 are provided on one wall so as to be lined up along the vertical direction.

[Embodiment 2]
An air purifying device 200 according to a second embodiment will be described with reference to FIGS. 9 to 12.

As shown in FIGS. 9 to 12, the air purifying device 200 of the second embodiment differs from the air purifying device 100 of the first embodiment in that the shielding body 4 includes a attracting portion 41 that attracts and attaches pathogen CV. . The second embodiment will be described mainly with respect to the parts that are different from the first embodiment, and the description of the parts that are the same between the second embodiment and the first embodiment will be omitted.

As shown in FIG. 9, the shielding body 4 has an attracting portion 41 that receives and absorbs ultraviolet rays, and also attracts and attaches pathogens CV. The shield 4 in FIG. 9 is a louver having the same shape as the shield 4 in FIG. Similar to the shield 4 in FIG. 3, the space between each louver blade 40 serves as an air passage AP.

As an example, the attracting part 41 includes a discharging part (not shown) that discharges electricity and a charging part (not shown) that charges it. The discharge section changes surrounding oxygen into ions by discharging. The pathogen CV becomes electrically charged due to the action of ionized oxygen. The charged pathogen CV is attracted to the charged part that is electrically charged with the opposite polarity to the pathogen CV. The pathogen CV then adheres to the charged part. Moreover, instead of the attracting part 41 having a discharging part and a charging part, a attracting part 41 made of an insulating material such as rubber may be used. The attracting part 41 made of an insulating material is charged by frictional electricity generated by friction with the air flow F in contact with the attracting part 41, and is used to attract and attach the pathogen CV electrically charged with the opposite polarity to the attracting part 41.

Further, the attracting portion 41 may simply cause the pathogen CV to adhere to it instead of attracting it to the pathogen CV. Pathogen CV is excreted from people's bodies when people cough or sneeze, so a large number of pathogen CV is collected in the air purifier 200 while being wrapped in droplets, that is, moisture, generated by coughing or sneezing. floating around. In order to attach the pathogen CV wrapped in moisture, a hydrophilic treatment may be performed to make it easier to attach moisture to the surface of the attracting portion 41. By subjecting the surface of the attracting portion 41 to hydrophilic treatment, the pathogen CV can be made to adhere to the hydrophilic surface of the attracting portion 41 together with the moisture surrounding the pathogen CV. Further, the attracting portion 41 may have a surface with minute irregularities so that the pathogen CV may be caught and attached to the irregularities.

The attracting portion 41 causes the harmful pathogens CV inside the ventilation passage 1 to adhere, so that the pathogen CV inside the ventilation passage 1 remains in the ultraviolet ray UV irradiation area UA inside the ventilation passage 1. Therefore, it is possible to keep the pathogen CV in the ultraviolet UV irradiation area UA and continue irradiating it with ultraviolet rays UV until the pathogen CV that tries to pass through the ultraviolet ray UV irradiation area UA is killed. Therefore, the number of pathogens CV discharged to the outside of the ventilation path 1 is reduced compared to the case where the attracting part 41 is not provided, and this contributes to reducing the number of pathogens CV in a short time.

Below, structures of modified examples 1 to 3 of the air purifying device 200 according to the second embodiment will be described with reference to FIGS. 10 to 12.

[Modification 1 of Embodiment 2]
As shown in FIG. 10, the shielding body 4 of the first modification of the air purifying device 200 according to the second embodiment includes an attracting part 41 that reflects ultraviolet rays UV and attracts and attaches pathogens CV, and an attracting part 41 upstream of the attracting part 41. It has a light shielding part 42 that is provided on the side or downstream side and receives and absorbs ultraviolet rays. The drawing part 41 is provided closer to the inside of the ventilation passage 1 than the light shielding part 42 is. Specifically, the shield 4 shown in FIG. 10 is a louver having the same shape as the shield 4 shown in FIG. 3. Although not shown, when the shielding body 4 is provided at the air passage entrance 12, the upstream side of each blade 40 forming the louver becomes the light shielding part 42, and the downstream side of each blade 40 becomes the drawing part 41. On the other hand, as shown in FIG. 10, when the shielding body 4 is provided at the ventilation path outlet 13, the upstream side of each blade 40 becomes the drawing part 41, and the downstream side of each blade 40 becomes the light shielding part 42.

Similar to the shielding body 4 described in Embodiment 1, the light shielding part 42 receives ultraviolet rays so that the amount of ultraviolet rays trying to pass through the air passage AP is other than the reference amount when passing through the air passage AP. absorbs UV rays. Furthermore, the light shielding part 42 reflects the ultraviolet rays that have not been received below the reference amount at a certain part, and receives them at another part of the light shielding part 42 and absorbs them so that the amount becomes below the reference quantity.

Since the attracting part 41 of the first modification of the second embodiment reflects ultraviolet rays UV, the pathogen CV adhering to the attracting part 41 receives not only the ultraviolet rays UV that the attracting part 41 receives, but also the ultraviolet rays reflected by the attracting part 41. It has the advantage of being irradiated with UV. Then, the ultraviolet rays reflected by the attracting part 41 and attempting to pass through the air passage AP of the shielding body 4 are received by the light shielding part 42 and absorbed so as to be below a reference amount.

[Modification 2 of Embodiment 2]
As shown in FIG. 11, the shielding body 4 of Modification 2, like the shielding body 4 shown in FIG. The drawing part 41 is provided closer to the inside of the ventilation passage 1 than the light shielding part 42 is. However, it differs from the shield 4 shown in FIG. 10 in that the number of light shielding parts 42 is greater than the number of attracting parts 41. Specifically, although both the drawing part 41 and the light shielding part 42 shown in FIG. The number of louver blades 40 is greater.

[Modification 3 of Embodiment 2]
As shown in FIG. 12, the wing plate 40 of the shielding body 4 of Modification 3 has a reflecting part 43 that reflects ultraviolet rays UV, and an attracting part 41 that attracts and attaches the pathogen CV. The attracting portion 41 of one wing plate 40 faces the reflecting portion 43 of another wing plate 40 provided across the air passage AP. Specifically, the shield 4 is a louver made up of a plurality of blades 40, and each blade 40 is sandwiched between two air passages AP. There is a drawing part 41 on one air passage AP side, and a light shielding part 42 on the other air passage AP side.

In the third modification of the second embodiment, the attracting part 41 is provided so as to face the reflecting part 43 across the air passage AP, so that the pathogen CV that has entered the air passage AP is transferred to the air passage AP of the attracting part 41. It is irradiated with ultraviolet rays that adhere to the portion facing the surface and reflected by the reflecting portion 43. In other words, the pathogen CV that has entered the air passageway AP can also be irradiated with ultraviolet rays. Therefore, the number of pathogens CV discharged to the outside of the ventilation path 1 can be reduced.

[Embodiment 3]
An air purifying device 300 according to Embodiment 3 will be described with reference to FIG. 13.

As shown in FIG. 13, the air purifier 300 of the third embodiment differs from the air purifier 100 of the first embodiment in the structure of the ventilation passage 1. Specifically, in the ventilation passage 1 of the air purifying device 300, the speed of the airflow FUA in the ultraviolet ray UV irradiation area UA is higher than the speed of the airflow on the upstream side and/or downstream side of the ultraviolet ray UV irradiation area UA. The structure is such that it is also slow. Embodiment 3 will mainly be described with respect to parts that are different from Embodiments 1 and 2, and descriptions of parts that are the same between Embodiment 3 and Embodiments 1 and 2 will be omitted.

As shown in FIG. 13, the ventilation passage 1 of the air purifying device 300 of the third embodiment has a deceleration area DA where the air flow F12 entering the inside of the ventilation passage 1 from the ventilation passage entrance 12 is decelerated, and a downstream area of the deceleration area DA. It has an ultraviolet ray UV irradiation area UA on the side and an acceleration area AA that accelerates the air flow FUA passing through the ultraviolet ray UV irradiation area UA. The deceleration region DA is a region in which the cross-sectional area of the flow path is larger on the downstream side than on the upstream side within the ventilation path 1. The cross-sectional area of the flow path means the cross-sectional area of the space 90 surrounded by the wall 11 and through which the air flow F passes. Specifically, the ultraviolet irradiation area UA is a space having the ultraviolet light source 2 inside the ventilation passage 1, and is an area surrounded by the wall 11 of the ventilation passage 1 and the shielding body 4. The speed increasing area AA is an area where the cross-sectional area of the flow path is smaller on the downstream side than on the upstream side inside the ventilation path 1. In addition, in FIG. 13, the ultraviolet ray UV irradiation area UA is illustrated with the flow path cross-sectional area being the same on the upstream and downstream sides, but the flow path cross-sectional area on the upstream and downstream sides of the ultraviolet ray UV irradiation area UA is The areas may be different. Further, although the air purifying device 300 in FIG. 13 has both the deceleration area DA and the acceleration area AA, depending on the application, it may have a structure having only either the deceleration area DA or the acceleration area AA.

Since the ventilation path 1 has the deceleration area DA, the speed of the airflow FUA in the ultraviolet ray UV irradiation area UA is slower than the speed of the airflow F12 at the ventilation path entrance 12. Therefore, the time from when the pathogen CV enters the ultraviolet UV irradiation area UA to when it exits becomes longer than in the case where the deceleration area DA is not provided, and the pathogen CV is irradiated with ultraviolet rays UV for a longer time. The number of pathogen CVs killed increases as the time for irradiation with ultraviolet UV increases, so by providing the deceleration area DA, a larger number of pathogen CVs can be killed.

Since the ventilation path 1 has the speed increasing area AA, the speed of the airflow F13 at the ventilation path exit 13 becomes faster than the speed of the airflow FUA in the ultraviolet UV irradiation area UA. Therefore, the air purifier 300 can be connected to devices that require the speed of the air flow F to be above a certain level so as to supply the purified air flow F.

[Embodiment 4]
Embodiment 4 is connected to a duct (building duct) for ventilation in a building such as a building, air circulation in a building, or temperature adjustment inside a building, and is similar to Embodiment 1 described above, although not shown. This is a duct (air cleaning duct) having any one of the air cleaning device 100 of Embodiment 3 to the air cleaning device 300 of Embodiment 3. The air purifying duct has a connecting member (not shown) such as a bellows-shaped hose in the middle or at the outlet of the building duct so that the air flowing through the building duct passes inside the ventilation path 1 shown in FIGS. 1 to 13. Connected via. When the air purifying duct is connected to the building duct in this way, the air flowing through the building duct passes through the ultraviolet UV irradiation area UA inside the ventilation duct 1, so pathogens CV carried with the air flowing through the building duct are exposed to the irradiation area. In UA, they are irradiated with ultraviolet light and killed, and their number decreases. Therefore, the building duct can supply purified air containing a small number of pathogens CV to a room of the building or the like.

Generally, the amount of airflow passing through a building duct is determined by a range of airflow speeds based on standards depending on the use of the building duct. The standard for the range of airflow speed is, for example, shown in the Building Facility Design Standards 2021 edition, but the airflow speed specified by the standard is not the same as the airflow passing through the ultraviolet UV irradiation area UA. It is often faster than the slow air flow rate below a certain value required to sufficiently reduce the number of pathogen CVs carried. Therefore, when the air purifier 100 in which the cross-sectional areas of the ventilation duct entrance 12, the inside of the ventilation duct 1, and the ventilation duct exit 13 shown in FIG. 1 are the same is connected to a building duct, the air flowing through the building duct is decelerated. It passes through the inside of the ventilation passage 1 at the same speed without being affected. Therefore, a large number of pathogens CV may pass through the ultraviolet UV irradiation area UA without being killed.

In order to prevent many pathogens CV from passing through the ultraviolet UV irradiation area UA, the air purifying duct of the fourth embodiment has a deceleration area DA and It is particularly preferable to include a speed increasing area AA. Note that in the air purifying device 300 in FIG. 13, the deceleration area DA and the speed increase area AA have been described as part of the ventilation passage 1, but the deceleration area DA and the speed increase area AA may also be members separate from the ventilation passage 1. good. Specifically, a connection member (not shown) having the deceleration area DA and a connection member (not shown) having the speed increase area AA may be connected to the ventilation passage inlet 12 and the ventilation passage outlet 13, respectively.

[Embodiment 5]
Embodiment 5 is an air cleaner 400 having any one of the air cleaner 100 of Embodiment 1 to the air cleaner 300 of Embodiment 3 described above. FIG. 14 shows an air cleaner 400 having an air cleaner 301 that is a slightly modified shape of the air cleaner 300 of Embodiment 3. In addition to the air purifier 301, the air cleaner 400 of Embodiment 5 has at least a blower device 6 that generates an air flow F passing through the ventilation path 1, and other components that float in the air entering the ventilation path 1. Filters to collect dust are also installed depending on the environment in which the device is used.

As shown in FIG. 14, the deceleration area DA and the acceleration area AA described in the air purifier 300 of FIG. It will be done. Specifically, the passage cross-sectional area of the ventilation passage entrance 12 of the air cleaner 400 is smaller than the passage cross-sectional area in the ultraviolet UV irradiation area UA inside the ventilation passage 1. Therefore, the air flow F22 entering the ventilation passage 1 is decelerated when passing through the ventilation passage entrance 12 and reaching the ultraviolet UV irradiation area UA. Further, the air cleaner 400 is provided with a guide member 15 on the downstream side of the ventilation passage outlet 13 for guiding the air flow F23 coming out of the ventilation passage outlet 13. The cross-sectional area of the passage 15P of the air flow F23 formed by the guide member 15 is smaller than the cross-sectional area of the passage in the ultraviolet UV irradiation area UA inside the ventilation passage 1. Therefore, the airflow F23 that has exited the ventilation passage outlet 13 increases its speed in the passageway 15P of the airflow F23.

The blower device 6 is provided inside the ventilation path 1 of the air purifying device 100. When the blower device 6 generates the air flow F, the air around the air cleaner 400 enters the inside of the ventilation path 1 through the ventilation path entrance 12 along with the pathogen CV. The pathogen CV that has entered the inside of the ventilation duct 1 is carried by the air flow F, moves, passes through the UV irradiation area UA, is irradiated with ultraviolet rays and is killed, and then passes through the ventilation duct outlet 13 and is transferred to the air purifier. 400 is discharged to the outside. In this way, the air purifier 400 kills the surrounding pathogens CV and then discharges them to the outside, which reduces the number of pathogens CV around the air purifier 400 and prevents people from getting sick. A difficult environment is created.

Similarly to the air purifier 100 of FIGS. 1 to 13, the air cleaner 400 of the fifth embodiment also kills more pathogens CV in a shorter time as the amount of air flowing inside the ventilation path 1 increases. The number can be reduced by The amount of air flow F passing through the ventilation passage 1 depends on the type or performance of the blower 6 and the flow blocked by the shield 4 in the passage cross-sectional area EA at the ventilation passage outlet 13, as shown in FIG. It is determined by the ratio of the road cross-sectional area MA (shielding ratio). The larger the shielding ratio is, the smaller the amount of airflow F passing through the inside of the ventilation path 1 shown in FIG. 14 is.

The relationship between the shielding ratio and the amount of airflow will be explained with reference to FIG. 16. FIG. 16 shows the shielding ratio and the airflow passing through the ventilation passage 1 when the shielding ratio is 50% and the amount of airflow passing through the ventilation passage 1 is 1.0 when the blower device 6 is a blower. It is a graph showing the relationship with quantity FR. The relationship between the shielding ratio shown in Fig. 16 and the amount of airflow FR passing through the ventilation passage 1 when the shielding ratio is 50% is based on the measured value of the pressure loss occurring inside the ventilation passage 1 at each shielding ratio and the blower catalog. It was calculated from the blower performance data described in .

As shown in FIG. 16, the airflow amount FR when the shielding ratio is 0% is about 1.1. However, the amount of airflow FR decreases as the shielding ratio increases. When the shielding ratio is 50%, the airflow amount FR is approximately 10% lower than when the shielding ratio is 0%. When the shielding ratio becomes greater than 50%, the airflow amount FR becomes even smaller, making it impossible to kill a large number of pathogens CV in a short period of time. Therefore, in order to kill a large number of pathogens CV in a short time, it is preferable that the shield 4 is provided so that the shielding ratio is 50% or less. Further, in FIG. 16, the case where the blower device 6 is a blower is illustrated, but the blower device 6 is, for example, a centrifugal blower other than a blower, an axial blower such as an axial fan, or a cross-flow blower such as a cross-flow fan. In the case of a blower, if the shielding ratio is greater than 50%, the amount of airflow passing through the ventilation path 1 will be equal to or less than that of the blower, so the shielding body 4 should be It is preferable to provide one.

Although the embodiments of the present invention have been described above, the embodiments of the present invention are not limited to the above-described embodiments. A shielding body 4 that prevents leakage of ultraviolet rays directed outside the area UA has a structure through which airflow passes, and the shielding body 4 has an attracting part 41 to which pathogens CV adhere, and the ventilation passage 1 1. Modifications may be made as appropriate without departing from the spirit of the present invention, which has a structure in which the speed of airflow passing through the ultraviolet UV irradiation area UA is slower than the speed of airflow passing through the upstream side and/or downstream side of the interior. can be added.

1: Ventilation path 2: Ultraviolet light source 3: Reflector 4: Shielding body 6: Air blower 41: Attraction section 46: Enclosing member 100: Air purifier 200: Air purifier 300: Air purifier 400: Air purifier CV: Pathogen UA: UV irradiation area

Claims (4)

An air purifying device that reduces the number of pathogens in the air by irradiating them with ultraviolet light,
a ventilation passage through which the air passes;
an ultraviolet light source that irradiates ultraviolet light from an inner surface of a wall of the ventilation passage toward another inner surface of the wall of the ventilation passage;
An air purifying device comprising: a shielding body that receives and absorbs the ultraviolet rays directed outside the irradiation area of the ultraviolet rays, and allows airflow to pass through. The shield has an attracting part that attracts the pathogen by being electrically charged,
The air purifying device according to claim 1, wherein the attracting portion reflects the ultraviolet rays. The cross-sectional area of the ventilation passage in the ultraviolet irradiation area is such that the speed of airflow in the ultraviolet ray irradiation area is slower than the speed of airflow on the upstream and/or downstream sides of the ventilation passage. The air cleaning device according to claim 1. The air cleaner according to any one of claims 1 to 3, wherein the shield is a louver, a lattice, a porous body, a honeycomb structure, or an enclosing member that surrounds a space through which air passes inside the ventilation path. Device.

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