JP5889136B2 - Air purifier with filter sterilization function - Google Patents

Description

  The present invention relates to an air cleaner with a filter sterilizing function that sterilizes bacteria, viruses, and the like trapped in a dust collection filter with ultraviolet light.

  In an air cleaner, a high-performance dust collection filter such as a HEPA filter or ULPA captures dust, bacteria, viruses, etc., and irradiates the dust collection filter with ultraviolet light from an ultraviolet lamp. Some techniques use a technique to sterilize captured bacteria and viruses (see, for example, Patent Document 1 to Patent Document 3). There is also a deodorizing filter provided downstream of the dust collecting filter to add a deodorizing function.

  Here, the HEPA filter refers to an air filter having a particle collection rate of 99.97% or more with respect to particles having a particle size of 0.3 μm at a rated air volume and an initial pressure loss of 245 Pa or less. . The ULPA filter refers to an air filter having a particle trapping rate of 99.9995% or more with respect to particles having a rated air volume of 0.15 μm and an initial pressure loss of 245 Pa or less.

JP 2000-111106 A JP 2003-190269 A JP 2009-195369 A

  In the HEPA filter, the ULPA filter, and the like, a pleated filter medium is fixed to a frame member with an adhesive, and fine particles in the air are captured by the filter medium. Generally as a filter medium, glass fiber and a nonwoven fabric are used. These filter media and adhesives used in dust collection filters are vulnerable to ultraviolet light, and when the dust collection filter is irradiated with ultraviolet light for sterilization, the deterioration progresses and the life of the dust collection filter is shortened. is there. In addition, when a structure such as a deodorizing filter is provided downstream of the dust collection filter, when irradiating the dust collection filter with ultraviolet light from the ultraviolet lamp from the downstream side of the dust collection filter, In general, an ultraviolet lamp is provided on the upstream side of the structure. However, if an ultraviolet lamp is provided between the dust collection filter and the structure, the distance between the ultraviolet lamp and the dust collection filter is reduced, so that the strong collection of ultraviolet light is directly applied to the dust collection filter, resulting in deterioration of the dust collection filter. The problem of speeding up arises. Further, there may be a problem that the dust collecting filter is deteriorated by heat from the ultraviolet lamp.

  Accordingly, an object of the present invention is to solve the above-described problems in the prior art and suppress the deterioration of the dust collecting filter while sterilizing the dust collecting filter with an ultraviolet lamp.

  In view of the above object, according to the present invention, a housing having an air flow path, a dust collection filter provided in the air flow path, and an ultraviolet ray provided on the downstream side of the dust collection filter in the air flow path. An air cleaner with a filter sterilization function for sterilizing the dust collection filter with ultraviolet light, and disposed in the air flow path so as to separate the dust collection filter and the ultraviolet light And further comprising a honeycomb structure and a reflector disposed between the dust collection filter and the honeycomb structure in the air flow path, and a bypass optical path is provided at a peripheral edge of the honeycomb structure. An air cleaner with a filter sterilizing function is provided in which ultraviolet light emitted from the light and passing through the detour optical path is reflected by the reflecting plate and applied to the downstream side surface of the dust collection filter.

  In the air cleaner with the filter sterilization function, an ultraviolet lamp is installed on the downstream side of the dust collection filter, so that bacteria, viruses, and the like that have not been captured by the dust collection filter can be sterilized. In addition, a honeycomb structure is provided between the dust collection filter and the ultraviolet lamp, but a bypass optical path is formed at the peripheral edge of the honeycomb structure, and the ultraviolet light that has passed through the bypass optical path is reflected by the reflector, Irradiation is directed toward the downstream side of the dust collection filter. Therefore, even if the dust collection filter and the ultraviolet lamp are separated by the honeycomb structure, it is possible to sterilize the downstream side surface of the dust collection filter with the ultraviolet light emitted from the ultraviolet lamp, while emitting from the ultraviolet lamp. It is possible to reduce the intensity of the ultraviolet light irradiated to the dust collection filter by the ultraviolet light being blocked by the honeycomb structure, and it is possible to suppress the deterioration of the dust collection filter. Furthermore, since the ultraviolet lamp is provided on the downstream side of the honeycomb structure, the distance between the dust collection filter and the ultraviolet lamp can be increased, and the adverse effect on the dust collection filter due to the heat of the ultraviolet lamp can be prevented. The “honeycomb structure” in the present application includes structures having a structure similar to the honeycomb structure, such as a lattice structure or a corrugated structure.

  In the air cleaner with a filter sterilizing function, the honeycomb structure is preferably formed of a material having a deodorizing action or carrying a material having a deodorizing action. In this case, it is more preferable that a photocatalyst is kneaded or supported on the material having the deodorizing action.

  Further, as a preferred embodiment, the ultraviolet lamp is a pair of ultraviolet lamps extending in the vertical direction, and the air cleaner with a filter sterilizing function is located downstream of the ultraviolet lamp and equidistant from the pair of ultraviolet lamps. You may further provide in the position the sub-reflection board formed in the wedge shape in which the center protrudes toward the said honeycomb structure.

  In the said air cleaner with a filter sterilization function, it is preferable that the said reflecting plate is a diffused reflecting plate.

  An ultraviolet attenuation means for attenuating the ultraviolet intensity may be provided in the bypass optical path. Further, an ultraviolet transmission plate that transmits ultraviolet rays and prevents air from passing may be provided in the bypass optical path.

  According to the present invention, the honeycomb structure is provided between the dust collection filter and the ultraviolet lamp to form a detour optical path at the peripheral portion thereof, and the detour is provided by the reflector provided between the dust collection filter and the honeycomb structure. Ultraviolet light that has passed through the optical path is applied to the downstream side surface of the dust collection filter. Thereby, even if the dust collection filter and the ultraviolet lamp are separated by the honeycomb structure, bacteria and viruses attached to the downstream side surface of the dust collection filter can be sterilized by the ultraviolet light emitted from the ultraviolet lamp, and the honeycomb The structure can block a part of the ultraviolet light and reduce the intensity of the ultraviolet light applied to the dust collection filter. As a result, it is possible to suppress the deterioration of the dust collection filter while sterilizing the dust collection filter with an ultraviolet lamp.

It is a sectional side view showing an embodiment of an air cleaner with a filter sterilization function of the present invention. It is a cross-sectional view of the air cleaner with a filter sterilization function along line II-II shown in FIG. It is explanatory drawing which shows the range and intensity | strength of the ultraviolet light irradiated to the downstream side surface of a dust collection filter from an ultraviolet lamp when the detour optical path is not provided in the peripheral part of the honeycomb structure. It is explanatory drawing which shows the range and intensity | strength of the ultraviolet light irradiated to the downstream side surface of a dust collection filter from an ultraviolet lamp when the detour optical path is provided in the peripheral part of the honeycomb structure.

Hereinafter, with reference to drawings, embodiment of air cleaner 11 with a filter sterilization function by the present invention is described.
First, with reference to FIG.1 and FIG.2, the whole structure of the air cleaner 11 with a filter sterilization function by this invention is demonstrated. The air cleaner 11 with a filter sterilizing function (hereinafter referred to as the air cleaner 11) is provided with an air inlet 15 and an air outlet 17 and an air flow path 19 extending from the air inlet 15 to the air outlet 17 is formed. And a blower 21 for causing air to flow in the air flow path 19 from the suction port 15 to the blowout port 17.

  A dust collection filter 23 and an ultraviolet lamp 25 are provided in the air flow path 19. The dust collection filter 23 is provided in the vicinity of the suction port 15 of the housing 13, and functions to trap and remove fine particles in the air sucked from the suction port 15 to clean the air. As the dust collection filter 23, a HEPA filter or a ULPA filter is used so that bacteria, viruses, and the like can be captured in addition to dust, dust, cigarette smoke, and the like. The ultraviolet lamp 25 is provided on the downstream side of the dust collection filter 23 in the air flow path 19 so that bacteria, viruses and the like captured by the dust collection filter 23 or passed through the dust collection filter 23 can be sterilized. . As the ultraviolet lamp 25, an arbitrary form can be used. Moreover, although the ultraviolet lamp 25 may provide only one, it is preferable to provide multiple.

  Further, in the air cleaner 11 according to the present invention, the honeycomb structure 27 is provided in the air flow path 19 so as to separate the dust collection filter 23 and the ultraviolet lamp 25. Here, the “honeycomb structure” only needs to have a structure in which a large number of air passages extending from the upstream side to the downstream side are formed, and a polygonal cylinder other than the hexagonal shape is formed in a honeycomb shape without gaps. It is assumed to include a structure having a side-by-side structure (for example, a lattice-like structure in which quadrangular cylindrical bodies are arranged) or a corrugated structure. A large number of air passages are formed in the honeycomb structure 27, and the ultraviolet lamp 25 is used only when the incident direction of the ultraviolet light and the longitudinal axis direction of the air passage (the direction in which the passage extends) substantially coincide. Allow passage of ultraviolet light emitted from the. Therefore, only a part of the ultraviolet light emitted from the ultraviolet lamp 25 passes through the honeycomb structure 27 and is irradiated on the downstream surface of the dust collection filter 23, and the ultraviolet intensity irradiated on the dust collection filter 23 is increased. Can be reduced. In addition, since many air passages are formed in the honeycomb structure 27, even if the dust collection filter 23 and the ultraviolet lamp 25 are separated by the honeycomb structure 27, the air flows upstream in the air flow path 19. It does not prevent the flow from the side to the downstream side.

  However, the ultraviolet light passing through the honeycomb structure 27 has only an incident direction substantially coincident with the longitudinal axis direction of the passage of the honeycomb structure 27 (direction in which the passage extends), and is shown in FIG. As shown, the narrow area located almost in front of the ultraviolet lamp 25 on the downstream surface of the dust collection filter 23 can be irradiated with ultraviolet light only locally. Therefore, in the present invention, a bypass optical path 29 for allowing ultraviolet light to pass therethrough is further provided at the periphery of the honeycomb structure 27, and between the dust collection filter 23 and the honeycomb structure 27 in the air flow path 19. A reflector 31 is provided. As shown in FIG. 2, the reflecting plate 31 is arranged so that the ultraviolet light that has passed through the detour optical path 29 of the honeycomb structure 27 is reflected toward the downstream surface of the dust collection filter 23.

  Thus, by providing the bypass optical path 29 at the peripheral edge of the honeycomb structure 27 and allowing the ultraviolet light that has passed through the bypass optical path 29 to be reflected toward the downstream side surface of the dust collection filter 23 by the reflector 31, Even if the honeycomb structure 27 is provided between the dust collection filter 23 and the ultraviolet lamp 25, the entire downstream surface of the dust collection filter 23 is irradiated with the ultraviolet light emitted from the ultraviolet lamp 25 as shown in FIG. 4. Can be sterilized. As the reflecting plate 31, a diffuse reflecting plate is preferably used. This is because, by using a diffuse reflector as the reflector 31, the ultraviolet light that has passed through the detour optical path 29 is reflected in various directions and diffuses over a wide range, so that the entire downstream surface of the dust collection filter 23 is covered. It is because it becomes possible to irradiate more uniformly.

As described above, one of the causes of the deterioration of the dust collection filter 23 is ultraviolet light, and irradiating the dust collection filter 23 with strong ultraviolet light leads to a decrease in the life of the dust collection filter 23. In particular, when a non-woven fabric is used as a filter medium in the dust collection filter 23, the non-woven fabric is more easily deteriorated by ultraviolet light than glass fibers, and irradiation with strong ultraviolet rays becomes a problem. On the other hand, the ultraviolet intensity required for 99.9% inactivation of bacteria, viruses and the like trapped in the dust collection filter 23 can be 10 μW / cm ² or more. Therefore, if the intensity of the ultraviolet rays applied to the dust collection filter 23 is reduced to a level sufficient to inactivate bacteria and viruses trapped by the dust collection filter 23 (for example, 10 to 40 μW / cm ² ), the dust collection filter 23 is reduced. The deterioration of the dust collection filter 23 can be suppressed without impairing the sterilization function of the stubby, and the life can be further extended. However, the honeycomb structure 27 formed with the bypass optical path 29 alone may not sufficiently reduce the ultraviolet intensity, and it is difficult to adjust the intensity of the transmitted ultraviolet light. Therefore, it is preferable to provide the bypass optical path 29 with ultraviolet attenuation means 33 for attenuating the ultraviolet intensity. As the ultraviolet attenuation means 33, a light shielding net or a light shielding film having various ultraviolet transmittances can be used. The ultraviolet attenuation means 33 is provided at a position upstream of the ultraviolet lamp 25 so that the ultraviolet intensity directly irradiated from the ultraviolet lamp 25 to the honeycomb structure 27 can be attenuated in addition to the bypass optical path 29. Alternatively, it may be provided so as to cover the periphery of the ultraviolet lamp 25 in addition to or instead of the bypass optical path 29.

  Further, in the air flow path 19, a sub-reflection plate 35 is provided on the downstream side of the ultraviolet lamp 25, and ultraviolet light emitted from the ultraviolet lamp 25 in the direction opposite to the honeycomb structure 27 (that is, toward the downstream side) It is preferable to reflect toward the honeycomb structure 27 (that is, toward the upstream side). By providing such a sub-reflection plate 35, the ultraviolet light emitted from the ultraviolet lamp 25 to the opposite side of the honeycomb structure 27 is reflected by the sub-reflection plate 35 toward the honeycomb structure 27, and the dust collection filter 23 is reflected. It becomes possible to efficiently contribute to sterilization of bacteria or viruses that have been captured or have passed through the dust collection filter 23.

  As described above, in the air cleaner 11 according to the present invention, the honeycomb structure 27 having the detour optical path 29 formed at the peripheral edge portion is provided between the dust collection filter 23 and the ultraviolet lamp 25, and the air flow path 19 includes the honeycomb structure 27. A reflector 31 is provided between the dust collection filter 23 and the honeycomb structure 27, and the ultraviolet light emitted from the ultraviolet lamp 25 and passing through the detour optical path 29 of the honeycomb structure 27 is reflected toward the downstream side surface of the dust collection filter 23. To be. Since a part of the ultraviolet light emitted from the ultraviolet lamp 25 can be blocked by the honeycomb structure 27 provided between the dust collection filter 23 and the ultraviolet lamp 25, the intensity of the ultraviolet light irradiated to the dust collection filter 23 is reduced. On the other hand, the ultraviolet light that has passed through the detour optical path 29 formed in the honeycomb structure 27 is reflected toward the dust collection filter 23 by the reflector 31 so that the downstream side surface of the dust collection filter 23 can be irradiated. Therefore, the dust collection filter 23 can be sterilized. As a result, it is possible to suppress the deterioration of the dust collection filter 29 and extend the life of the dust collection filter while sterilizing the dust collection filter 29 with the ultraviolet lamp 25.

  In the embodiment shown in FIGS. 1 and 2, the air cleaner 11 includes a housing 13 in which an air flow path 19 extending from the inlet 15 to the outlet 17 is formed, and from the inlet 15 to the outlet 17. A blower 21 for causing air to flow in the air flow path, and a dust collection filter 23 provided along the air flow path 19, a reflecting plate 31, a honeycomb structure 27, an ultraviolet lamp 25, and a sub-reflecting plate 35 are provided. . The air inlet 15 is formed on the front surface of the housing 13, while the air outlet 17 is formed on the upper surface of the housing 13. The air flow path 19 extends from the suction port 15 to the rear wall of the housing 13 in a substantially horizontal direction, and extends from the upper portion of the first flow path 19a on the back wall side of the housing 13. 17, the dust collecting filter 23, the reflecting plate 31, the honeycomb structure 27, the ultraviolet lamp 25, and the sub-reflecting plate 35 are the first channel portion 19 a of the air channel 19. On the other hand, the blower 21 is disposed in the second flow path portion 19b. Further, a space between the honeycomb structure 27 and the back wall of the housing 13 in the first flow path portion 19a of the air flow path 19 and in which the ultraviolet lamp 25 is disposed is a bacterium or virus in the air. The wall surface (except for the honeycomb structure 27) surrounding the sterilization chamber 39 is constituted by a reflection wall surface so as to reflect the ultraviolet light emitted from the ultraviolet lamp 25. Has been. The reflection wall surface is preferably made of a diffuse reflection material that easily diffuses ultraviolet light into the sterilization chamber 39.

  Further, detour light paths 29 each having a substantially rectangular cross section elongated in the vertical direction are provided on both side portions of the honeycomb structure 27, and the ultraviolet light that has passed through the detour light path 29 is moved to the downstream side surface of the dust collection filter 23 by the reflector 31. Reflected toward. As the ultraviolet lamp 25, an elongated rod-like shape extending in the vertical direction is used so that the emitted ultraviolet light can easily pass through the bypass optical paths 29 on both sides of the honeycomb structure 27. In addition, a diffuse reflector is used as the reflector 31.

  Note that a HEPA filter is used as the dust collection filter 23, and bacteria, viruses, and the like can be removed from the air sucked from the suction port 15 in addition to fine particles such as dust. More specifically, in this embodiment, a two-layer filter medium composed of an inflow side layer formed of a polyester fiber / modaacryl fiber mixed non-woven fabric and an outflow side layer formed of a polyolefin fiber non-woven fabric is used and charged by charging. In addition, a charged filter type HEPA filter having a trapping function by electrostatic force is used as the dust collection filter 23.

  The honeycomb structure 27 in the present embodiment carries a material having a deodorizing action. The honeycomb structure 27 may be made of a material having a deodorizing action. In this way, air is passed through the air passages formed in the honeycomb structure 27 by supporting the deodorizing material on the honeycomb structure 27 or configuring the honeycomb structure 27 with such a material. Sometimes deodorization can be performed, and the honeycomb structure 27 can function as a deodorization filter. Examples of the material having a deodorizing action include materials such as metal catalysts containing manganese, copper, cobalt, and iron oxides, phthalocyanine catalysts having cobalt, copper, iron, etc. as the core, activated carbon, and iron oxide. Further, a photocatalytic material such as titanium oxide may be kneaded or supported on a material having a deodorizing action. If the photocatalyst material is kneaded or supported in this manner, the honeycomb structure 27 is irradiated with ultraviolet light, and in addition to the sterilizing action by the ultraviolet light, the sterilizing action by the redox action of the photocatalyst is added. Is possible.

  In the air cleaner 11 of the present embodiment, as shown in FIG. 2, a pair of ultraviolet lamps 25 are provided in the sterilization chamber 39 at symmetrical positions across the center of the air flow path 19. In addition, the sub-reflection plate 35 is disposed on the back wall of the sterilization chamber 39 on the downstream side of the ultraviolet lamp 23 at a position equidistant from the pair of ultraviolet lamps 25 (that is, in the center in the width direction). Is formed in a wedge shape projecting toward the honeycomb structure 27. The inclination of the two reflecting surfaces of the sub-reflecting plate 35 is set so that the ultraviolet light emitted from the ultraviolet lamp 25 and reflected by the reflecting surface of the sub-reflecting plate 35 is likely to go mainly to the center in the width direction of the honeycomb structure 27. Has been. It is preferable that the sub-reflection plate 35 is constituted by a total reflection plate.

  When only one ultraviolet lamp 25 is provided, the ultraviolet lamp 25 is disposed at the center in the width direction of the air flow path 19. However, if two ultraviolet lamps 25 are provided, each ultraviolet lamp 25 is connected to the honeycomb structure. 27 can be provided in the vicinity of the bypass optical path 29, and the ultraviolet light can easily pass through the bypass optical path 29. Further, the ultraviolet light irradiated to the dust collection filter 23 is incident substantially perpendicularly on the downstream side surface of the honeycomb structure 27 and the light reflected by the reflector 31 through the detour optical path 29 of the honeycomb structure 27. Since it is limited to those passing through the air passage formed in the honeycomb structure 27, when only one ultraviolet lamp 25 is provided, it is close to the central region and the detour optical path 29 on the downstream surface of the dust collection filter 23. The ultraviolet light is irradiated around the both side regions, and the intensity of the ultraviolet light applied to the intermediate portion between the both side regions and the central region tends to be low. However, by providing two ultraviolet lamps 25, each ultraviolet lamp 25 can be disposed at a position deviated from the center in the width direction of the air flow path 29 to the side, and both sides of the downstream side surface of the honeycomb structure 27. Since the ultraviolet light emitted from the ultraviolet lamp 25 enters the region between the partial region and the central region almost perpendicularly, the ultraviolet light passes through the air passage in this region. Thereby, the ultraviolet-ray intensity | strength irradiated to the area | region between the width direction center part area | region and both-sides area | region among the downstream surfaces of the dust collection filter 23 can be increased. In addition, a wedge-shaped sub-reflecting plate 35 is disposed at the center in the width direction of the air flow path 19 on the downstream side of the ultraviolet lamp 25, and the ultraviolet light reflected by the reflecting surface is at the center in the width direction of the honeycomb structure 27. Since the inclination of the reflecting surface is set so as to go, the ultraviolet light reflected by the sub-reflecting plate 35 enters the central region on the downstream side surface of the honeycomb structure 27 substantially perpendicularly. As a result, the ultraviolet light emitted from the ultraviolet lamp 25 passes through the honeycomb structure 27 and is also applied to the central region in the width direction on the downstream surface of the dust collection filter 23. As a result, compared with the case where one ultraviolet lamp 25 is used, the downstream surface of the dust collection filter 23 can be irradiated with ultraviolet light more evenly, the ultraviolet intensity is locally increased, and the dust collection filter 23 is locally Deterioration can be prevented.

In the air cleaner 11 of the embodiment, a light shielding net is provided as an ultraviolet attenuation means 33 at a position upstream of the bypass optical path 29 and the ultraviolet lamp 25. The light shielding net is also provided on the upstream side in the vicinity of the ultraviolet lamp 25 because the ultraviolet light incident substantially perpendicularly from the ultraviolet lamp 25 onto the downstream side surface of the honeycomb structure 27 passes directly through the honeycomb structure 27. This is because the downstream surface of the dust collection filter 23 is irradiated, so that the ultraviolet intensity is locally increased only in that region, and there is a possibility that deterioration of the dust collection filter 23 is accelerated. The light shielding rate of the light shielding net is preferably set so that the ultraviolet intensity on the downstream side surface of the HEPA filter is 40 μW / cm ² or less and the ultraviolet intensity on the downstream side surface of the honeycomb structure 27 is 500 to 600 μW / cm ² or more. . By setting the light shielding rate by the light shielding net in this manner, the life of the HEPA filter is suppressed, and at the same time, bacteria and viruses that are not captured by the dust collection filter 23 and pass through the honeycomb structure are irradiated from the ultraviolet lamp 25. It is possible to exert an effect of directly sterilizing with ultraviolet light.

  When the honeycomb structure 27 is added with a deodorizing function to function as a deodorization filter as in the present embodiment, the ultraviolet light is blocked so as to block the bypass optical path 29 of the honeycomb structure 27 as shown in FIG. It is preferable to provide an ultraviolet transmitting plate 37 that transmits light and prevents passage of air. By providing the ultraviolet ray transmitting plate 37 so as to block the bypass optical path 29 of the honeycomb structure 27, air surely passes through the air passage formed in the honeycomb structure 27, and the air passes downstream through the bypass optical path 29. It is possible to prevent a decrease in deodorizing performance due to wrapping around. The ultraviolet transmissive plate 37 may be provided on the upstream side of the ultraviolet attenuation means 33 or may be provided on the downstream side. Further, the ultraviolet attenuation means 33 and the ultraviolet transmission plate 37 are integrally formed, or as the ultraviolet attenuation means 33, an ultraviolet transmission plate 37 that attenuates and transmits ultraviolet light is provided. May also be used.

Next, operation | movement of the air cleaner 11 shown by FIG.1 and FIG.2 is demonstrated.
The air cleaner 11 sucks outside air from the suction port 15 by the action of the blower 21, causes the air flow path 19 to flow from upstream to downstream, and discharges it from the blowout port 17 to the outside. The air sucked from the suction port 15 flows along the first flow path portion 19a of the air flow path 19, and first, dust, dust, smoke, bacteria, viruses, etc. contained in the air are collected by the dust collection filter 23. Of fine particles are captured. The air that has passed through the dust collection filter 23 passes through the honeycomb structure 27 that exhibits a deodorizing function, so that it is deodorized and flows into the sterilization chamber 39. Even if bacteria or viruses that are not captured by the dust collection filter 23 are contained in the air, they can be sterilized by being irradiated with ultraviolet light from the ultraviolet lamp 25 in the sterilization chamber 39. Thus, the sterilized and deodorized air flows from the sterilization chamber 39 into the second flow path portion 19 b of the air passage 19, flows downstream, and is discharged from the outlet 17. Since the bypass light path 29 of the honeycomb structure 27 is provided with the ultraviolet ray transmitting plate 37, the deodorized air always passes through the path formed in the honeycomb structure 27 and flows around the bypass light path 29 downstream. It does not flow to the side, and the deodorizing performance can be prevented from being lowered. Further, since the ultraviolet light transmitting plate 37 transmits ultraviolet light, it does not prevent the ultraviolet light from passing through the bypass optical path 29.

  Further, of the ultraviolet light emitted from the ultraviolet lamp 25, the light passing through the bypass optical path 29 of the honeycomb structure 27 is reflected by the reflection plate 31 made of a diffuse reflection plate and irradiated to the downstream surface of the dust collection filter 23. The In addition, the ultraviolet light incident from the ultraviolet lamp 25 to the downstream side surface of the honeycomb structure 27 substantially perpendicularly is also irradiated to the downstream surface of the dust collection filter 23 through the air passage. Thereby, the dust collection filter 23 is sterilized from the downstream side, and is kept clean. A part of the ultraviolet light emitted from the ultraviolet lamp 25 is blocked by the honeycomb structure 27, and the ultraviolet light that passes through the honeycomb structure 27 and is applied to the dust collecting filter 23 is ultraviolet attenuation means. Since the light-shielding net 33 is attenuated to a degree sufficient to maintain the sterilization effect, the deterioration of the dust collection filter 23 due to the irradiation of ultraviolet light can be suppressed, and the sterilization effect of the dust collection filter 23 is maintained. However, the life of the dust collection filter 23 can be extended. On the other hand, in the sterilization chamber 39, ultraviolet light that has not been attenuated by the ultraviolet attenuation means 33 is irradiated to the air, so that bacteria and viruses that have not been captured by the dust collection filter 23 can be sterilized strongly.

  Further, if a photocatalytic material is kneaded or supported on the material having a deodorizing action used for the honeycomb structure 27, the honeycomb structure 27 is irradiated with ultraviolet light from the ultraviolet lamp 25 to the honeycomb structure 27. Bactericidal action of bacteria and viruses attached to 27 can be achieved.

  The air cleaner with a filter sterilizing function according to the present invention has been described above with reference to the illustrated embodiment, but the present invention is not limited to the illustrated embodiment. For example, although two ultraviolet lamps are used in the illustrated embodiment, only one ultraviolet lamp may be used, or three or more ultraviolet lamps may be used. In the illustrated embodiment, the transmission optical path is provided only on both side portions of the honeycomb structure, but the transmission optical path may be provided on other peripheral portions such as an upper part and a lower part of the honeycomb structure.

DESCRIPTION OF SYMBOLS 11 Air cleaner 13 Housing 19 Air flow path 23 Dust collection filter 25 Ultraviolet lamp 27 Honeycomb structure 29 Transmission light path 31 Reflecting plate 33 Ultraviolet attenuation means 35 Sub-reflecting plate 37 Ultraviolet transmitting plate

Claims (7)

A housing having an air flow path; a dust collection filter provided in the air flow path; and an ultraviolet lamp provided on the downstream side of the dust collection filter in the air flow path; An air purifier with a filter sterilizing function that is sterilized by light,
A honeycomb structure disposed in the air flow path so as to separate the dust collection filter and the ultraviolet lamp;
A reflector disposed between the dust collection filter and the honeycomb structure in the air flow path;
A bypass optical path is provided at the peripheral edge of the honeycomb structure, and the ultraviolet light emitted from the ultraviolet lamp and passed through the bypass optical path is reflected by the reflecting plate and irradiated to the downstream side surface of the dust collecting filter. An air cleaner with a filter sterilizing function, characterized in that   The air cleaner with a filter sterilizing function according to claim 1, wherein the honeycomb structure is formed of a material having a deodorizing action or carrying a material having a deodorizing action.   The air cleaner with a filter sterilizing function according to claim 2, wherein a photocatalytic material is kneaded or supported on the material having the deodorizing action.   The ultraviolet lamp is a pair of ultraviolet lamps extending in the vertical direction, and the air purifier with a filter sterilizing function is located downstream of the ultraviolet lamp and equidistant from the pair of ultraviolet lamps, and the center is the honeycomb. The air cleaner with a filter sterilizing function according to any one of claims 1 to 3, further comprising a sub-reflecting plate formed in a wedge shape protruding toward the structure.   The air cleaner with a filter sterilizing function according to any one of claims 1 to 4, wherein the reflector is a diffuse reflector.   The air cleaner with a filter sterilizing function according to any one of claims 1 to 5, wherein an ultraviolet attenuation means for attenuating ultraviolet intensity is provided in the bypass optical path.   The air cleaner with a filter sterilizing function according to any one of claims 1 to 6, wherein an ultraviolet transmitting plate that transmits ultraviolet light and prevents air from passing is provided in the bypass optical path.

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