JP2009195665A - Device for disinfection and deodorization - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for preserving freshness which can efficiently preserve freshness of perishable foods with saved energy by trapping bacteria and decomposing and removing the same prior to diffusion of ethylene gas or the like from the perishable foods. <P>SOLUTION: To achieve the above task, an inlet 4 is installed on the upper side of a machine body 3 in which a side panel 2 is curved inward, an outlet 5 is installed on the bottom, a photocatalytic filter 6, an ultraviolet irradiator 7 and a blower 8 are installed in the machine body 3 located between the inlet 4 and the outlet 5 downstream in a stream of air, a perishable food 9 is placed close to the side panel 2 curved inward, air is sucked from the inlet 4 and gotten through the photocatalytic filter 6 in the machine body 3, ethylene gas or the like is decomposed and removed, this air from which bacteria are decomposed and removed is discharged from the outlet 5 in a slight flow slower than a prescribed flow rate, and turbulent flow in a preservation space 10 is reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is installed in hospital clinics, waiting rooms, nursing homes, nurseries, office work floors, reception rooms, showrooms, etc. to remove bacteria, viruses, dust, and odors in these rooms and clean them. The present invention relates to a sterilization deodorizing apparatus.

  In hospitals and offices, many unspecified people often come in and out, and in particular, hospitals and others are visited by people affected by diseases, so it cannot be denied that various bacteria and viruses exist. Furthermore, the dust is thought to be floating with these bacteria and viruses attached, and the odor does not necessarily exacerbate the symptoms of people coming to the hospital. Under such circumstances, it is strongly desired not only in hospitals and offices but also at home to remove and clean bacteria, viruses, dust, and odors drifting in the room.

  On the other hand, various measures are being taken especially for hospital infections in hospitals, but in reality the measures are hardly taken in offices and homes. As for nosocomial infections, measures have been delayed for the magnitude of the actual harm. The reason is that it is technically possible to remove all bacteria, viruses, dust and odors in the air, but it is presumed that the price, especially the maintenance cost, is difficult. Under such circumstances, the following sterilization apparatus using a photocatalyst is known.

  JP 2006-280428 A   Japanese Patent Laid-Open No. 2005-17212   JP 2005-161022 A

  The sterilization apparatus of Patent Document 1 has a chemical adsorption layer, a physical adsorption layer, and a photocatalyst layer that decomposes harmful gases and odors in order from the intake port to the exhaust port in a pleated shape as a whole. The hybrid filter formed, and a light source module having a plurality of LED chips that irradiate the photocatalyst layer of the hybrid filter with ultraviolet rays. Then, harmful gas and odor are sequentially chemisorbed and physically adsorbed in the process of air containing harmful gas and odor passing through the chemical adsorption layer, physical adsorption layer and photocatalyst layer of the pleated hybrid filter. Furthermore, the harmful gas and odor that could not be removed by the chemical adsorption and physical adsorption are decomposed and removed by the photocatalyst of the photocatalyst layer.

  The sterilization apparatus of Patent Document 2 includes a prefilter, a plasma ionizer, a photocatalytic filter, and an ultraviolet irradiation light source in order from the intake port to the exhaust port. In the process of air containing dust and pathogenic bacteria passing through the prefilter, plasma ionizer, and photocatalytic filter, the dust and pathogenic bacteria are sequentially passed through the prefilter and then coarse dust is passed through to the fine dust and pathogens that have passed through the plasma. A strong charge is applied by an ionizer, and it is captured and decomposed by a photocatalytic filter.

  The sterilization apparatus of Patent Document 3 includes a prefilter, a plasma ionization unit, a first photocatalytic filter, an ultraviolet irradiation light source, and a second photocatalytic filter in order from the intake port to the exhaust port. And in the process that the air containing dust and pathogenic bacteria passes through the prefilter, plasma ionization unit, first photocatalytic filter and second photocatalytic filter, the dust and pathogenic bacteria are sequentially passed through the coarse dust first with the prefilter. A powerful charge is imparted to fine dust and pathogenic bacteria with a plasma ionizer, and then sequentially captured and removed by a first photocatalytic filter and a second photocatalytic filter.

  In Patent Document 1, there is a limit to the amount of contaminants that can be adsorbed on the chemical adsorption layer and the physical adsorption layer of the hybrid filter, and the amount of contaminants that can be decomposed is limited. Since there is no multilayer structure with the photocatalyst layer, the hybrid filter must be replaced and discarded as the adsorption amount of the chemical adsorption layer and the physical adsorption layer ends.

  Since Patent Document 2 imparts a strong charge with a plasma ionizer, dust and pathogenic bacteria can be efficiently captured with a photocatalytic filter, and the pathogenic bacteria can be decomposed and removed, but dust that cannot be decomposed and removed on the photocatalytic filter, It is impossible to decompose and remove pathogenic bacteria after covering the layers early. Accordingly, the problem of early replacement of the photocatalytic filter and disposal of the replaced photocatalytic filter emerges. That is, the pathogenic bacteria attached on the dust layered on the photocatalytic filter is not decomposed and killed, and the photocatalytic filter on which the live pathogenic bacteria remain attached is discarded.

  The same thing as the case of patent document 3 can be said also in patent document 3, and since the photocatalyst filter is divided into 1st and 2nd, the period which can decompose and remove pathogenic bacteria etc. is only prolonged. Therefore, the problem of the replacement | exchange of the 1st and 2nd photocatalyst filter of the early stage similar to patent document 2, and the disposal of the replaced 1st and 2nd photocatalyst filter will surface.

  Then, this invention is made | formed in view of the said situation, and makes it a subject to provide the sterilization deodorizing apparatus with which the lifetime of a photocatalyst filter is long, replacement frequency is low, and disposal of a photocatalyst filter is also easy. .

The present invention has been proposed in order to achieve the above-mentioned problems, and is characterized by having the following configuration.
That is, according to the first aspect of the present invention, the air inlet is provided on the plate surface of the side plate of the box body, the exhaust port is provided on the upper side plate opposite to the air inlet, and the air flow is downstream from the air inlet. In the box between the exhaust port, a pre-filter for removing coarse dust, an upstream photocatalytic filter, a photocatalytic induction light irradiator, a downstream photocatalytic filter, a fine dust removing precision filter and a blower are sequentially provided. When the blower is stopped, the ultraviolet irradiator is continuously operated for at least 10 minutes.

  The invention described in claim 2 is a sterilization deodorizing apparatus in which a caster is attached to the bottom of the box and a shock absorber is provided at the ridge angle of the box.

  The invention described in claim 3 is a sterilization deodorizing apparatus in which a deodorizing filter for removing odor is provided between the precision filter and the blower, and a negative ion generator is provided between the blower and the exhaust port.

As described above in detail, the present invention has the following effects.
According to the first aspect of the present invention, when the blower in the box is driven, air containing bacteria, viruses, dust, odors and the like is sucked from the suction port on the side plate surface of the box, and is taken into the box. Coarse dust is removed with a filter, bacteria, viruses and odors are decomposed and removed with an upstream photocatalyst filter and a downstream photocatalyst filter, and fine dust is removed with a precision filter, and the purified air is taken into the intake port. It discharges from the exhaust port in the upper part of the side plate on the opposite side. When the blower is stopped, the photocatalytic induction light irradiator continues to operate for more than 10 minutes, and continues to irradiate the photocatalytic induction light to the upstream photocatalytic filter and the downstream photocatalytic filter, and adheres to these surfaces. Decomposes and removes bacteria, viruses and odors. Therefore, since dust that cannot be disassembled and removed is not taken into the photocatalyst filter more than necessary, the life is long and the replacement frequency is low, and the photocatalytic action inducing light continues to be irradiated even after the blower is stopped. Since the bacteria, viruses, and odors that are present are decomposed and removed, the photocatalytic filter can be easily replaced and disposed of.

  The invention described in claim 2 can be easily and freely moved by the caster under the box, and the impact absorbing material at the ridge angle of the box alleviates the impact caused by the obstacle or the collision of the moving person. Therefore, in addition to the above effects, the movement is easy and free, and during the movement, there is an effect that the impact caused by the collision can be reduced and damage can be largely avoided.

  The invention according to claim 3 removes odors with a deodorizing filter and can be expected to be healed by negative ions generated by a negative ion generator. In some cases, it is expected to remove bacteria, viruses and odors. Therefore, in addition to the above effects, bacteria, viruses and odors can be removed and a healing effect can be expected.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  1 is a front view of a sterilization deodorization apparatus showing Example 1 of the present invention, FIG. 2 is a plan view of the sterilization deodorization apparatus of FIG. 1, and FIG. 3 is a sectional view taken along line III-III of FIG. In the drawing, the sterilization deodorizing apparatus 1 is provided with an air inlet 4 on the plate surface of the side plate 3 of the box 2, an air outlet 6 on the side plate 5 on the opposite side of the air inlet 4, and the air inlet 4. In the box 2 between the air outlet 6 and the exhaust port 6 which is downstream in terms of airflow, a coarse dust removing prefilter 7, an upstream photocatalyst filter 8, a photocatalytic action inducing light irradiator 9, a downstream photocatalyst filter 10, fine dust The removal precision filter 11 and the blower 12 are sequentially provided, and when the blower 12 is stopped, the photocatalytic induction light irradiator 9 is continuously operated for at least 10 minutes.

  The box 2 has a substantially rectangular parallelepiped shape. The caster 20 is attached to the bottom of the box 2 so that the box 2 can move freely and can be installed in a room where bacteria, viruses, dust, odors, etc. are to be removed. Shock absorbers 21 such as rubber are attached to 8 ridges, and even if it hits an obstacle or a person during movement, the impact is absorbed by the shock absorber 21 to reduce damage to the obstacle or person. The box 2 itself can be prevented from being damaged. The side plate 3 of the box 2 has a suction port 4 that occupies most of the plate surface, and an exhaust port 6 at the upper portion of the opposite side plate 5.

  Further, as described above, the side plate 3 of the box body 2 has the suction port 4 that occupies most of the plate surface, the upper side of the opposite side plate 5 has the exhaust port 6, and the box body 2. Inside, there are partition plates 22, 23, and 24, and inside the box partitioned by these, a cleaning device 25 for removing bacteria, viruses, dust, odors and the like and the blower 12 are incorporated.

  The upper plate 13 of the box 2 can be freely removed, and the cleaning equipment 25 and the blower 12 can be maintained. In addition, the exhaust port 6 is installed at the upper part of the side plate 5 of the box 2 in the pre-filter 7, upstream and downstream photocatalytic filters 8 and 10, and photocatalytic induction light, which are cleaning devices 25 described later. The irradiator 9, the precision filter 11, and the deodorizing filter 26 are sequentially arranged side by side in the box body 2, and finally the blower 12 is arranged so that the discharged air goes up, that is, to the exhaust port 6. This is because these devices are efficiently arranged in the box 2 so that the volume of the box 2 can be minimized. Reference numeral 14 in FIGS. 1 to 3 denotes an inspection window of the photocatalytic action induced light irradiator 9.

  In addition to the above-described devices, the cleaning device 25 includes a deodorizing filter 26 for removing odor between the precision filter 11 and the blower 12, and a negative ion generator between the blower 12 and the exhaust port 6. 27 is installed. These cleaning devices 25 will be described in detail below along the flow of air from the suction port 4 to the exhaust port 6.

  The pre-filter 7 of the cleaning device 25 is attached in close contact with the suction port 4 and mainly removes coarse dust in the introduced air. The coarse dust is upstream and downstream photocatalytic filter 8. And 10, it can prevent adhering to the surface of the photocatalytic action inducing light irradiator 9 to reduce the contamination and prevent the deterioration of these capabilities.

  Since the upstream photocatalyst filter 8 and the downstream photocatalyst filter 10 are the same except for the installation location, the upstream photocatalyst filter 8 will be described in detail. The upstream photocatalytic filter 8 sinters the surface layer-forming ceramic particles on the surface of the skeleton of the ceramic three-dimensional network structure porous body to newly form a concave and convex surface, and supports the photocatalyst on the concave and convex surface. It is a thing. Since the skeleton of the three-dimensional network structure porous body has a diameter of 100 μm to 1000 μm, and the surface layer forming ceramic particles have a particle diameter of 1 μm to 50 μm, the three-dimensional network structure porous body A good uneven surface is formed on the skeleton, and has a sufficient surface area, and photocatalytic induction light by the photocatalytic induction light irradiator 9 described in detail below reaches the inside of the upstream photocatalytic filter 8. Thus, highly efficient photocatalytic action can be realized.

Incidentally, the photocatalyst is fine powder of anatase type titanium oxide (TiO ₂₎ is mainly used is not particularly limited, as long as it a photocatalytic action. The titanium oxide, which is this photocatalyst, contains about 20% of SiO ₂ as a binder, although it is the main component, and is baked and supported on the uneven surface of the three-dimensional network porous body. Therefore, the baked titanium oxide is hard to drop off due to the anchoring effect of the uneven surface, and it is possible to prevent the performance degradation and dust generation due to the dropping of the titanium oxide as the photocatalyst, and the performance can be improved and maintained, and the regeneration It becomes possible. Since this photocatalyst contains about 20% of SiO _{2 in} addition to titanium oxide, its surface becomes weakly acidic, and when a basic gas such as ammonia gas is present, its adsorption and decomposition can be promoted. I can do it.

  The photocatalyst-induced light irradiator 9 may be a hot cathode light lamp or a cold cathode fluorescent lamp, either of which can be used. From the viewpoint of durability, a cold cathode fluorescent lamp is advantageous. When photocatalyst induced light such as ultraviolet rays is irradiated from the photocatalyst induced light irradiator 9 to the photocatalyst such as titanium oxide of the upstream photocatalyst filter 8 and the downstream photocatalyst filter 10, active oxygen or OH having a strong oxidative decomposition action Radicals are generated, and these decompose and remove bacteria, viruses, and odors in the air that pass through the upstream and downstream photocatalytic filters 8 and 10.

  The precision filter 11 removes fine particles such as bacteria, viruses, and odors that could not be captured by the pre-filter 7 and the upstream and downstream photocatalytic filters 8 and 10. As the precision filter 11, a high efficiency particulate air (HEPA) filter, which is a mechanical filtration system, is used.

  The deodorizing filter 26 mainly removes odors that cannot be captured by the upstream and downstream photocatalytic filters 8 and 10, and removes odors by physical adsorption, for example, adsorption by activated carbon.

  The negative ion generator 27 generates negative ions, and these negative ions do not particularly remove contaminants such as bacteria, viruses, dust, and odors, but are removed if favorable conditions overlap. Can be expected. However, this negative ion has the effect of relaxing mind and body and promoting metabolism, so it is welcomed in hospitals, homes or offices.

  The blower 8 introduces bacteria, viruses, dust, odors and the like together with ambient air into the box 2 through the suction port 4 and passes through the cleaning device 25, and pollutants such as bacteria, viruses, dust and odors. Is removed, and the purified air is discharged from the exhaust port 6. There is no particular limitation as long as these air volumes and pressures can be secured.

Next, the use situation of the sterilization deodorizing apparatus 1 having the above-described configuration will be described.
First, the sterilization deodorization apparatus 1 is moved and installed in a place where there is a high possibility that bacteria, viruses, dust, odors, etc. exist in hospitals. At that time, even if the sterilization deodorizing apparatus 1 collides with an obstacle or a person, it will hit the shock absorbing material 21 at the eight corners of the box 2, so that the shock is absorbed and the damage is alleviated. Therefore, it will not cause a serious situation on both sides. Then, when the operation of the sterilization and deodorization apparatus 1 is started, the blower 12 is driven, and air containing bacteria, viruses, dust, odors, and the like is sucked from the suction port 4 on the side plate 3 plate surface of the box 2. It is taken into the box 2, coarse dust is removed by the pre-filter 7, bacteria, viruses and odors are decomposed and removed by the upstream photocatalyst filter 8 and the downstream photocatalyst filter 10, and fine dust is further obtained by the precision filter 11. Remove.

  Further, if there is the deodorizing filter 26 and the negative ion generator 27, the odor that could not be removed by each upstream device is removed, and further, negative ions are released from the negative ion generator 27 to the obtained purified air, The purified air containing negative ions is discharged from the exhaust port 6 at the upper part of the side plate 5 opposite to the intake port 4.

  Then, when the operation of the sterilization deodorizing apparatus 1 is stopped, the blower 12 is immediately stopped, but the photocatalytic action induced light irradiator 9 continues to operate for 10 minutes or more, and the upstream photocatalytic filter 8 and the downstream photocatalytic filter 10 After continuing to irradiate the photocatalytic induction light and decompose and remove odors and bacteria adhering to these surfaces, the photocatalytic induction light irradiator 9 also stops. Therefore, unlike the conventional example, the plasma ionizer 71 imparts a strong electric charge and does not take in dust that cannot be decomposed and removed into the photocatalyst filter more than necessary, so that the upstream and downstream photocatalytic filters 8 and 10 Longer life and less frequent replacement are required. Moreover, after the blower 12 is stopped, the photocatalyst-induced light is continuously irradiated to decompose and remove remaining odors and bacteria. Replacement and disposal of the photocatalytic filters 8 and 10 are also facilitated.

In the following, it was verified that the bacteria remaining on the photocatalytic filter can be decomposed and removed when the photocatalytic filter continues to be irradiated with photocatalytic action-induced light even after the blower is stopped. Show.
<Test Example 1>
0.4 ml of MRSA-containing solution is dripped onto the photocatalyst filter and irradiated with ultraviolet rays for 10 minutes 0.4 ml of Staphylococcus aureus-containing solution is dropped onto the photocatalyst filter and irradiated with ultraviolet rays for 10 minutes. The solution is added dropwise and irradiated with ultraviolet rays for 10 minutes. Each of the contained solutions is washed out with SCDLP medium from each photocatalyst filter after being irradiated with the ultraviolet rays, and cultured to measure the number of surviving bacteria.
<Control Example 1>
Drop 0.4 ml of MRSA-containing liquid on the petri dish and irradiate with UV for 10 minutes Drop 0.4 ml of S. aureus-containing liquid on the petri dish and irradiate with UV for 10 minutes Drop the E. coli-containing liquid on 0.4 ml on the petri dish Then, ultraviolet rays are irradiated for 10 minutes. The number of surviving bacteria is measured in the same manner as in Test Example 1.
The verification results are shown in Table 1 below.

According to Table 1, in Test Example 1, MRSA, Staphylococcus aureus and Escherichia coli were 10 or less, whereas in Control Example 1, 3-4 × 10 ⁵ bacteria remained, and after the operation was completed. It has been demonstrated that when the photocatalytic filter is continuously irradiated with the photocatalytic action-inducing light for 10 minutes, most of the bacteria remaining on the photocatalytic filter are decomposed and removed.

  As described above, the first embodiment of the present invention has been described, but the specific configuration is not limited to this, and modifications and additions within the scope not departing from the gist of the present invention, other combinations in each claim, It should be understood that this is possible as appropriate.

  The sterilization and deodorization apparatus of the present invention has a very high availability when the life of the photocatalyst filter is long and the replacement frequency is low, and the disposal of the photocatalyst filter is also easy.

  It is a front view of the disinfection deodorizing apparatus which shows Example 1 of this invention (Example 1).   (Example 1) which is a top view of the disinfection deodorizing apparatus of FIG.   FIG. 3 is a longitudinal sectional view taken along line III-III in FIG. 2 (Example 1).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sterilization deodorizing device 2 Box 3, 5 Side plate 4 Suction port 6 Discharge port 7 Prefilter 8 Upstream photocatalytic filter 9 Photocatalytic action induction light emitter 10 Downstream photocatalytic filter 11 Precision filter 12 Blower 13 Upper plate 14 Inspection window 20 Caster 21 Shock Absorber 22, 23, 24 Partition 25 Cleaner Equipment 26 Deodorizing Filter 27 Negative Ion Generator

Claims (3)

  An air inlet is provided on the plate surface of the side plate of the box body, an exhaust port is provided in the upper part of the side plate opposite to the air inlet, and the box body between the air inlet and the exhaust port downstream in terms of airflow In addition, a pre-filter for removing coarse dust, an upstream photocatalyst filter, a photocatalytic induction light irradiator, a downstream photocatalyst filter, a fine filter for fine dust removal and a blower are sequentially provided, and when the blower is stopped, the ultraviolet irradiation is performed. A sterilization deodorizing apparatus characterized in that the machine is continuously operated for at least 10 minutes.   The sterilization deodorizing apparatus according to claim 1, wherein a caster is attached to the bottom of the box and a shock absorber is provided at a ridge angle of the box.   The sterilization deodorizing apparatus according to claim 1 or 2, wherein a deodorizing filter for removing odor is provided between the precision filter and the blower, and a negative ion generator is provided between the blower and the exhaust port.

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