Air treatment device

Abstract

To provide an air treatment device capable of reducing the number of components while maintaining desired air treatment performance.SOLUTION: According to an embodiment, a housing of the air treatment device includes an air vent port for introducing air, and an air exhaust port for discharging air, and the air vent port and the air exhaust port are connected to each other to allow air to circulate inside the housing. A light source unit is disposed within the housing and irradiates ultraviolet light in a predetermined direction. A filter includes a substrate that supports a photocatalyst and an opening, and is disposed within the housing so as to intersect with an air flow direction. The substrate includes an ultraviolet light-irradiated surface onto which the ultraviolet light is irradiated from the light source, and an opposite surface opposite to the ultraviolet light-irradiated surface. The opening is provided so that an opening rate of the ultraviolet light-irradiated surface relative to an area of the ultraviolet light-irradiated surface has an upper limit of approximately 38% and a lower limit of approximately 34% to approximately 20%. No light-shielding member is provided on the upstream side of the filter along the air flow direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE Embodiments of the present invention relate to an air treatment device. [Background technology]

[0002] Titanium dioxide, the main component of photocatalysts, is a semiconductor made of crystalline metal oxide. Due to its nature, titanium dioxide has an energy structure called a band structure, in which the orbitals of discrete electrons in atoms and molecules form bands. The band gap of titanium dioxide is such that when it absorbs ultraviolet light in the range of 365nm to 405nm, electrons in the valence band are excited and move to the conductor, generating free electrons and holes.

[0003] When free electrons and holes combine, no reaction occurs, but when oxygen molecules in the air come into contact with free electrons, an oxidizing agent called superoxide anion is generated, and when water molecules in the air come into contact with holes, a reducing agent called hydroxyl radical is generated. Both of these have an oxidizing / reducing effect on organic matter, and break down the organic compounds that cause odors. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-051268 A Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved by the present invention is to provide an air treatment device that can reduce the number of parts while maintaining a desired air treatment performance. [Means for solving the problem]

[0006] According to an embodiment, the air treatment device includes a housing; a light source unit; and a filter. The housing includes an air vent for introducing air and an exhaust port for discharging air, and the air vent and the exhaust port are connected to each other to allow air to flow inside. The light source unit is disposed in the housing and irradiates ultraviolet light in a predetermined direction. The filter includes a base material carrying a photocatalyst and an opening, and is disposed in the housing so as to intersect with the air flow direction. The base material includes an ultraviolet light irradiated surface on which ultraviolet light is irradiated from the light source unit, and an opposite surface opposite to the ultraviolet light irradiated surface. The opening is provided in the base material so as to connect the ultraviolet light irradiated surface and the opposite surface. The opening is provided so that the opening ratio of the ultraviolet light irradiated surface to the area of ​​the ultraviolet light irradiated surface is approximately 38% at the upper limit and approximately 34 to approximately 20% at the lower limit. No light shielding member is provided on the upstream side of the filter along the air flow direction. Effect of the Invention

[0007] According to the present invention, it is possible to provide an air treatment device that can reduce the number of parts while maintaining a desired air treatment performance. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic diagram of an air treatment device according to an embodiment; [Diagram 2] FIG. 2 is a schematic diagram of a photocatalytic filter disposed within a housing of the air treatment device according to the first embodiment. [Diagram 3] FIG. 4 is a schematic diagram of an air treatment device according to a comparative example. [Figure 4] 4 is a table showing the relationship between the aperture ratio (0%, 30%, 40%, 50%, 100%) of the photocatalytic filter of the air treatment device according to the comparative example and the illuminance of light at the measurement point P2 in FIG. 3. [Diagram 5] A graph with the aperture ratio in Figure 4 on the horizontal axis and illuminance on the vertical axis. [Figure 6] 2 is a graph showing the relationship between the aperture ratio of the photocatalytic filter of the air treatment device according to the present embodiment and the illuminance of light at the measurement point P2 in FIG. 1. [Figure 7]4 is a table showing the relationship between the aperture ratio (20%, 30%, 40%, 50%, 55%, 70%) of the photocatalytic filter of the air treatment device according to the comparative example and the air volume at the measurement point P1 in FIG. [Figure 8] Graph showing the relationship between the aperture ratio and air volume when using the photocatalytic filter of the air treatment device according to the comparative example and this embodiment, with the horizontal axis representing the aperture ratio and the vertical axis representing the air volume, and showing the relationship between the aperture ratio and air volume when using the photocatalytic filter of the air treatment device according to the comparative example, and the relationship between the aperture ratio and the air volume when the photocatalytic filter of the air treatment device according to the first embodiment, which does not have a light-shielding grill, is used, and when the air volume is increased by 5%, 10%, 15%, 20%, and 25% compared to the comparative example. [Figure 9] FIG. 11 is a schematic diagram of a photocatalytic filter disposed within a housing of an air treatment device according to a second embodiment. [Figure 10] 4 is a table showing the relationship between the PPI (15, 20, 30) of the photocatalytic filter of the air treatment device according to the comparative example and the illuminance of light at the measurement point P2 in FIG. 3. [Figure 11] A graph with PPI in Figure 10 on the horizontal axis and illuminance on the vertical axis. [Figure 12] 13 is a graph showing the relationship between the PPI and light illuminance of the photocatalytic filter of the air treatment device according to the second embodiment. [Figure 13] 4 is a table showing the relationship between the PPI (15, 20, 30, 40, 50, 60) of the photocatalytic filter of the air treatment device according to the comparative example and the air volume at the measurement point P1 in FIG. [Figure 14] Graph showing the relationship between PPI and air volume when using the photocatalytic filter of the air treatment device of the comparative example and this embodiment, with the horizontal axis representing the PPI and the vertical axis representing the air volume, and showing the relationship between PPI and air volume when using the photocatalytic filter of the air treatment device of the comparative example, and the relationship between PPI and air volume when using the photocatalytic filter of the air treatment device of the second embodiment, which does not have a light-shielding grill, when the air volume is increased by 10%, 15%, 20%, 30%, 40%, and 50% compared to the comparative example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The air treatment device (10) of the embodiment has a housing (12), a light source unit (14), and a filter (16). The housing (12) has an air vent (22) for introducing air and an exhaust port (24) for discharging air, and the air vent (22) and the exhaust port (24) are connected to each other to allow air to circulate inside. The light source unit (14) is disposed within the housing (12) and irradiates ultraviolet light in a predetermined direction. The filter (16) includes a base material supporting a photocatalyst and an opening (55), and is disposed in the housing (12) so as to intersect with the air flow direction. The base material includes an ultraviolet light irradiated surface (54a) on which ultraviolet light is irradiated from the light source unit (14), and an opposite surface (54b) opposite to the ultraviolet light irradiated surface (54a). The opening (55) is provided in the base material so as to connect the ultraviolet light irradiated surface (54a) to the opposite surface (54b). The opening (55) is provided so that the opening ratio of the ultraviolet light irradiated surface (54a) to the area of ​​the ultraviolet light irradiated surface (54a) is approximately 38% at the upper limit and approximately 34% to approximately 20% at the lower limit. No light shielding member (118) is provided on the upstream side of the filter (16) along the air flow direction. By appropriately setting the aperture ratio, the air treatment device (10) of the embodiment can control the illuminance of light such as ultraviolet light passing through the filter (16) and the air volume to desired levels. Furthermore, the air treatment device (10) of the embodiment does not have a light blocking member (118) provided upstream of the filter (16) along the air flow direction, and therefore the number of parts can be reduced while maintaining the desired air treatment performance.

[0010] The air treatment device (10) of the embodiment has a housing (12), a light source unit (14), and a filter (16). The housing (12) has an air vent (22) for introducing air and an exhaust port (24) for discharging air, and the air vent (22) and the exhaust port (24) are connected to each other to allow air to circulate inside. The light source unit (14) is disposed within the housing (12) and irradiates ultraviolet light in a predetermined direction. The filter (16) includes a base material supporting a photocatalyst and an opening (55), and is disposed in the housing (12) so as to intersect with the air flow direction. The base material includes an ultraviolet light irradiated surface (54a) on which ultraviolet light is irradiated from the light source unit (14), an opposite surface (54b) opposite to the ultraviolet light irradiated surface (54a), and a side surface (54c) formed as a surface between the ultraviolet light irradiated surface (54a) and the opposite surface (54b). The opening (55) is provided in the base material so as to connect the ultraviolet light irradiated surface (54a) and the opposite surface (54b), or to connect the ultraviolet light irradiated surface (54a) and the opposite surface (54b) via the side surface (54c). The opening (55) is provided so that the lower limit of the PPI for the ultraviolet light irradiated surface (54a) is about 16.97, and the upper limit is about 19.2 to about 60. No light blocking member (118) is provided upstream of the filter (16) along the air flow direction. By appropriately setting the PPI, the air treatment device (10) of the embodiment can control the illuminance of light such as ultraviolet light passing through the filter (16) and the air volume to desired states. Furthermore, the air treatment device (10) of the embodiment does not have a light blocking member (118) provided upstream of the filter (16) along the air flow direction, and therefore the number of parts can be reduced while maintaining the desired air treatment performance.

[0011] In the air treatment device (10) of the embodiment, the air volume between the filter (16) in the housing (12) and the light source unit (14) is 1.9 m in a specified mode. 3 / min or more, and the illuminance of the ultraviolet light from the light source (14) through the filter (16) is 227.45 mW / cm 2 It is preferred that: In this example, the air volume is 1.9 m 3 / min or more, i.e., by increasing the air treatment volume per unit time to the current level or higher, the air treatment device (10) according to the embodiment can ensure current or higher air treatment performance. 2 By setting the above, the illuminance of leakage light emitted to the outside from the air treatment device (10) according to the embodiment can be set to the current level or lower.

[0012] Hereinafter, embodiments will be described with reference to the drawings.

[0013] (First embodiment) An air treatment device 10 according to a first embodiment will be described with reference to Figs. 1 to 8.

[0014] Fig. 1 is a schematic diagram of an air treatment device 10 according to an embodiment. In Fig. 1, the X axis is taken in the width direction, the Y axis is taken in the depth direction, and the Z axis is taken in the height direction.

[0015] Air treatment device 10 includes a housing 12 , a light source unit 14 , and a filter unit 16 .

[0016] The housing 12 is formed in a generally cylindrical shape. The housing 12 includes an intake port 22 for introducing air and an exhaust port 24 for discharging air. The housing 12 connects the intake port 22 and the exhaust port 24, and has an air treatment tank (circulation section) 26 formed therein for circulating air between the intake port 22 and the exhaust port 24.

[0017] In this embodiment, an example will be described in which the intake port 22 at one end of the housing 12 is located on the lower side, and air is taken in from the lower side of the housing 12, and the exhaust port 24 at the other end of the housing 12 is located on the upper side, and air is exhausted from the upper side of the housing 12. That is, an example in which air flows from the lower side to the upper side (in the +Z direction) will be described. Note that one end and the other end of the housing 12 may be at the same height so that the air flows approximately horizontally. Also, the intake port 22 may be on the upper side and the exhaust port 24 on the lower side so that the air flows from the upper side to the lower side (in the -Z direction).

[0018] In this embodiment, the housing 12 is formed to have an exterior size of about 420 mm in width (width along the X-axis) × 150 mm in depth (length along the Y-axis) × 850 mm in height (height along the Z-axis), for example. Therefore, the internal space for processing air within the housing 12 is smaller than that.

[0019] The inner circumferential surface of the housing 12 (particularly the inner circumferential surface of the region between the light source section 14 and the filter section 16) is formed as a reflective surface that appropriately reflects ultraviolet light and the like from the UV light source 34 described later.

[0020] The light source unit 14 is provided in the flow section 26 of the housing 12. In this embodiment, the light source unit 14 is preferably provided at a relatively upper position in the housing 12, for example, in a state in which the intake port 22 is disposed on the lower side and the exhaust port 24 is disposed on the upper side.

[0021] The light source unit 14 has a light source substrate 32 that is attached to the housing 12 using a predetermined fixing means, and a plurality of UV light sources 34 that are attached to the light source substrate 32 .

[0022] The light source substrate 32 preferably extends along the width direction, for example, in the flow section 26 of the housing 12, and is supported on at least one of a pair of side walls in the housing 12 using a predetermined fixing means, jig, or the like. The light source substrate 32 is formed in a size and shape that does not easily obstruct the flow of air inside the housing 12. For example, a hole is provided in the light source substrate 32, and the air inside the housing 12 passes through the hole.

[0023] The UV light sources 34 are disposed at appropriate intervals along the longitudinal direction of the light source substrate 32. The UV light source 34 includes a UV-A LED that emits UV-A light and a UV-C LED that emits UV-C light. That is, the ultraviolet light emitted by the UV light source 34 includes UV-A and UV-C. The UV light source 34 may include one LED that emits both UV-A and UV-C light, instead of the UV-A LED and the UV-C LED. The UV light source 34 irradiates ultraviolet light toward a portion of the circulation section 26 below the UV light source 34 and a surface (ultraviolet light irradiated surface) 54a of a photocatalytic filter 54 of the filter section 16, which will be described later.

[0024] The air treatment device 10 irradiates, for example, UV-C from the UV light source 34 toward the inner circumferential surface of the circulating part 26 of the housing 12 and the photocatalytic filter 54. That is, the air in the space between the inner circumferential surface of the circulating part 26 of the housing 12 and the surface of the photocatalytic filter 54 is irradiated with, for example, UV-C from the UV light source 34 to sterilize the air circulating through the circulating part 26 in the housing 12, the inner circumferential surface of the circulating part 26, and the surface of the photocatalytic filter 54.

[0025] Furthermore, the air treatment device 10 irradiates, for example, UV-A from the UV light source 34 onto, preferably the entire surface of, the irradiated surface 54a of the photocatalytic filter 54, to excite the photocatalyst of the photocatalytic filter 54. The air introduced into the housing 12 from the air intake 22 enters the circulation section 26 through the irradiated surface 54a from the opposite surface 54b opposite the irradiated surface 54a of the photocatalytic filter 54, and is deodorized in the process by the action of the photocatalyst excited by the UV-A.

[0026] In this embodiment, two fans (axial fans) 40 are disposed in the housing 12 above (on the exhaust side of) the light source unit 14 and between the light source unit 14 and the exhaust port 24. When the fans 40 are driven, an appropriate amount of air flows in one direction within the housing 12 per unit time. The measurement point P1 of the air volume here is within the circulation unit 26. In other words, the air volume at the measurement point P1 is the air volume between the photocatalytic filter 54 in the circulation unit 26 of the housing 12 and the UV light source 34 of the light source unit 14. The rotation speed of the fans 40 is adjusted depending on an appropriate mode, and the amount of air flowing through the circulation unit 26 is adjusted.

[0027] The fan 40 may be provided outside the housing 12 of the air treatment device 10, and does not have to be provided in the air treatment device 10 as long as there is an appropriate amount of air flow per unit time inside the housing 12. Also, only one fan 40 may be provided, or three or more fans 40 may be provided.

[0028] In this embodiment, inside the housing 12, the filter unit 16, the light source unit 14, and the fan 40 are arranged linearly in this order along the air flow direction, that is, from the upstream side to the downstream side.

[0029] The filter section 16 of the air treatment device 10 shown in FIG. 1 includes, within the housing 12, a pre-filter 52 made of, for example, stainless steel and an air treatment filter 54 arranged from the intake side along the air flow direction.

[0030] The prefilter 52 is formed, for example, in a mesh shape, and is disposed upstream of the filter 54 and downstream of the intake port 22 so as to intersect, preferably be perpendicular to, the direction of air flow in the flow section 26 of the housing 12. In this embodiment, the prefilter 52 is preferably disposed at a relatively lower position in the housing 12, for example, with the intake port 22 disposed on the lower side and the exhaust port 24 disposed on the upper side. The prefilter 52 prevents dust of an appropriate size contained in the air from reaching the opposite surface 54b of the filter 54.

[0031] The filter 54 is disposed downstream of the prefilter 52 so as to cross, preferably be perpendicular to, the air flow direction in the flow section 26 of the housing 12. In this embodiment, the air processing filter 54 is a photocatalytic filter using a ceramic as a base material. Titanium dioxide, the main component of a photocatalyst, is supported on the base material of the photocatalytic filter 54. The photocatalytic filter 54 is disposed relatively lower (on the intake side) within the flow section 26 of the housing 12. In this embodiment, the photocatalytic filter 54 is disposed adjacent to the prefilter 52, directly above and downstream of the prefilter 52.

[0032] The photocatalytic filter 54 is disposed so that the ultraviolet light from the UV light source 34 does not leak between the outer peripheral surface of the photocatalytic filter 54 and the inner peripheral surface of the flow section 26 of the housing 12 .

[0033] FIG. 2 shows an example of the photocatalytic filter 54. As shown in FIG. 1 and FIG. 2, the photocatalytic filter 54 is formed in a honeycomb shape having a number of openings 55 connecting an upper surface (exhaust side) 54a as an ultraviolet light irradiated surface to which ultraviolet light is irradiated, and a lower surface (intake side) 54b as the opposite surface. The side 54c of the photocatalytic filter 54 is closed. The honeycomb shape is not limited to an octagon, but may be a circle or an N-sided shape (N is an integer of 3 or more). In this embodiment, titanium dioxide, which is the main component of the photocatalyst, is supported on the approximately square openings 55 of the base material of the photocatalytic filter 54. Note that titanium dioxide, which is the main component of the photocatalyst, may also be supported on the upper surface 54a and the lower surface 54b of the photocatalytic filter 54.

[0034] The aperture ratio of the photocatalytic filter 54 is preferably adjusted by changing the aperture ratio of the openings 55 of the substrate of the photocatalytic filter 54, and the amount of titanium dioxide or the like supported on the substrate is preferably not changed or the change is suppressed even with the aperture ratio of the photocatalytic filter 54. The aperture ratio here refers to the ratio of the opening area of ​​the openings 55 arranged on the upper surface 54a to the total area on the upper surface 54a side of the photocatalytic filter 54 (the area of ​​the substrate arranged on the upper surface 54a + the opening area of ​​the openings 55 arranged on the upper surface 54a).

[0035] The thickness (height) of the photocatalytic filter 54 in the present embodiment along the Z axis is, for example, 8 mm. In addition, the photocatalytic filter 54 in the present embodiment has openings on the ultraviolet light irradiated surface 54a and the opposite surface 54b, but preferably has no opening on the side surface 54c.

[0036] The ultraviolet light irradiated surface 54a and the opposite surface 54b of the photocatalytic filter 54 shown in Fig. 2 are each substantially square in shape along the XY plane. In this embodiment, for example, three photocatalytic filters 54 are arranged in one direction (X-axis direction). In this embodiment, the UV light source 34 is disposed directly above the ultraviolet light irradiated surface 54a of the photocatalytic filter 54, and ultraviolet light including UV-A and UV-C is irradiated from the UV light source 34 directly above onto the ultraviolet light irradiated surface 54a of the photocatalytic filter 54.

[0037] Fig. 3 shows a schematic diagram of an air treatment device 100 according to a comparative example for comparison with the air treatment device 10 according to the present embodiment shown in Fig. 1. The appearance and size of the air treatment device 100 of the comparative example are assumed to be the same as those of the air treatment device 10 according to the present embodiment. The size of the circulating part 26 of the air treatment device 100 of the comparative example is assumed to be the same as those of the air treatment device 10 according to the present embodiment.

[0038] In the air treatment device 100 of the comparative example, a light-shielding grille (light-shielding member) 118 is provided on the upstream side (intake side) along the air flow direction below the prefilter 52 of the air treatment device 10 according to the present embodiment. The light-shielding grille 118 is formed to prevent light such as ultraviolet light from passing straight from the top to the bottom. The light-shielding grille 118 blocks not only ultraviolet light but also air flow. For this reason, the light-shielding grille 118 causes a pressure loss, and the flow rate and flow speed of the air flowing through the flow section 26 in the housing 12 may decrease.

[0039] 4 shows the illuminance of ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52 when the aperture ratio of the photocatalytic filter 54 of the air treatment device 100 of the comparative example is 30%, 40%, and 50%. The measurement point of the illuminance of ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52 is the position indicated by the symbol P2 in the housing 12 of the air treatment device 100 of the comparative example shown in FIG. 3. The ultraviolet light here includes UV-A and UV-C emitted from the UV light source 34. This is also the same as the illuminance of ultraviolet light obtained through the photocatalytic filter 54 and the prefilter 52 of the air treatment device 10 of the present embodiment shown in FIG.

[0040] As shown in FIG. 4, when the aperture ratio of the photocatalytic filter 54 of the air treatment device 100 according to the comparative example is 0%, the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the pre-filter 52 is 0 mW / cm. 2 This is because the photocatalytic filter 54 is closed and does not allow ultraviolet light to pass through. When the aperture ratio of the photocatalytic filter 54 is 100%, the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the pre-filter 52 is 1890.5 mW / cm 2was measured.

[0041] FIG. 5 shows the illuminance (mW / cm2) of ultraviolet light obtained through the photocatalytic filter 54 and the pre-filter 52 versus the aperture ratio (%) of the photocatalytic filter 54 of the air treatment device 100 of the comparative example. 2 5, when the aperture ratio of the photocatalytic filter 54 is between 30% and 50%, the relationship between the aperture ratio of the photocatalytic filter 54 and the illuminance of ultraviolet light is approximately linear. At least when the aperture ratio is between 30% and 50%, the illuminance of ultraviolet light passing through the photocatalytic filter 54 increases by approximately 6 mW / cm for every 1% increase in the aperture ratio. 2 As described above, when the aperture ratio of the photocatalytic filter 54 is 0%, the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the pre-filter 52 is 0 mW / cm 2 As shown in Fig. 5, when a virtual line is drawn between the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52 when the aperture ratio of the photocatalytic filter 54 is 0% and the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52 when the aperture ratio is 50%, the illuminance approximately matches the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52 when the aperture ratio is 30%. Therefore, it is estimated that the relationship between the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52 and the aperture ratio of the photocatalytic filter 54 from 0% to 50% is approximately linear.

[0042] In addition, when it is assumed that the relationship between the aperture ratio of the photocatalytic filter 54 and the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the pre-filter 52 is approximately linear when the aperture ratio is increased by 50% to 100%, the light illuminance increases by approximately 31.8 mW / cm for every 1% increase in the aperture ratio. 2 Change.

[0043] 4 and 5, as described above, when the aperture ratio is from 0% to 50%, the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the pre-filter 52 increases by about 6 mW / cm for every 1% increase in the aperture ratio of the photocatalytic filter 54. 2Therefore, in the air treatment device 10 according to this embodiment, it is estimated that the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the pre-filter 52 may vary with this gradient when the aperture ratio is from 0% to 50%. Fig. 6 shows that when the aperture ratio of the photocatalytic filter 54 is from 0% to 50%, the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the pre-filter 52 increases by approximately 6 mW / cm for every 1% increase in the aperture ratio. 2 6 shows a graph showing the relationship between the aperture ratio of the photocatalytic filter 54 and the illuminance of light when it is assumed that the aperture ratio changes (see FIG. 5). Also, FIG. 6 shows that when the aperture ratio of the photocatalytic filter 54 is from 50% to 100%, the illuminance of the ultraviolet light passing through the photocatalytic filter 54 and the pre-filter 52 increases by approximately 31.8 mW / cm for every 1% increase in the aperture ratio. 2 5 shows a graph illustrating the relationship between the aperture ratio of the photocatalytic filter 54 and the light illuminance when it is assumed that the aperture ratio changes (see FIG. 5).

[0044] In addition, when the opening ratio of the photocatalytic filter 54 of the air treatment device 100 of the comparative example is 40%, the light illuminance at the measurement point P2 through the photocatalytic filter 54, the pre-filter 52, and the light shielding grille 118 is 227.45 mW / cm 2 It was. The allowable illuminance of the ultraviolet light from the UV light source 34 of the air treatment device 10 according to this embodiment that passes through the photocatalytic filter 54 and the pre-filter 52 is, for example, 40% aperture ratio of the photocatalytic filter of a ready-made air treatment device, and 227.45 mW / cm illuminance. 2 Therefore, anything below this value (strictly speaking, not just this value, but including an error of ± several percent) is considered acceptable.

[0045] In the graph shown in FIG. 6, in the air treatment device 10 according to this embodiment, the illuminance of the ultraviolet light is 227.45 mW / cm 2 The aperture ratio at this time corresponds to approximately 38%.

[0046] Fig. 7 shows the air volume at the measurement point P1 when the aperture ratio of the photocatalytic filter 54 of the air treatment device 100 according to the comparative example is 20%, 30%, 40%, 50%, 55%, and 70%. Fig. 8 shows a graph (see symbol L0) including a linear approximation line, which shows an example of the relationship between the aperture ratio and the air volume shown in Fig. 7. It can be seen that the air volume increases approximately linearly as the aperture ratio of the photocatalytic filter 54 increases. That is, it can be seen that when the aperture ratio of the photocatalytic filter 54 is in the range of 20% to 70%, the air volume in the flow section 26 of the housing 12 (at the measurement point P1) increases linearly as the aperture ratio of the photocatalytic filter 54 increases.

[0047] In the air treatment device 100 according to the comparative example, when the opening ratio of the photocatalytic filter 54 is 40%, the air volume at the measurement point P1 in the flow section 26 of the housing 12 in one mode is 1.90 m 3 / min. The air volume at the measurement point P1 in the flow section 26 of the air treatment device 10 according to this embodiment is, for example, 1.90 m 3 For example, the air volume in the circulating unit 26 of the air treatment device 100 in the comparative example is a measured value of a ready-made product, and it is understood to be acceptable if it is equal to or greater than this value (strictly speaking, not only this value but also including an error of ± several percent).

[0048] The air treatment device 10 according to this embodiment is not provided with the light-shielding grill 118 (see FIG. 3) that is present in the comparative example of the air treatment device 100. Therefore, it is expected that the air volume per unit time at the measurement point P1, i.e., the air treatment volume, will be increased in the air treatment device 10 according to this embodiment compared to the comparative example of the air treatment device 100.

[0049] For example, removing the light-shielding grill 118 from the air treatment device 100 of the comparative example results in the air treatment device 10 according to this embodiment. Assuming that removing the light-shielding grill 118 increases the air volume by 5%, 10%, 15%, 20%, and 25%, respectively, the relationship between the aperture ratio of the photocatalytic filter 54 and the air volume is obtained as shown in Fig. 8. These approximation lines in the range of aperture ratio from 20% to 70% are designated by symbols L1, L2, L3, L4, and L5, respectively.

[0050] For example, assuming that the air volume is increased by 5% compared to when the light shielding grill 118 of the comparative example is present (see approximation line L0), as shown by the linear approximation line L1 in FIG. 8, when the opening ratio of the photocatalytic filter 54 falls below about 34%, the air volume of the air treatment device 100 of the comparative example in a predetermined mode is 1.90 m 3 / min or less. In other words, if it is assumed that the air volume increases by 5% by removing the light shielding grille 118, the aperture ratio of the photocatalytic filter 54 is preferably 34% or more. Here, the illuminance at the measurement point P2 is 227.45 mW / cm as described above. 2 is used as a reference, the aperture ratio of the photocatalytic filter 54 at this time is approximately 38%. For this reason, it can be said that the aperture ratio of the photocatalytic filter 54 to be used is preferably approximately 34% to approximately 38%.

[0051] Similarly, assuming that the air volume is increased by 10% compared to when the light shielding grille 118 of the comparative example is present (see approximation line L0), as shown by the linear approximation line L2 in FIG. 8, when the opening ratio of the photocatalytic filter 54 falls below about 29%, the air volume of the air treatment device 100 of the comparative example in a predetermined mode is 1.90 m 3 / min or less. In other words, if it is assumed that the air volume increases by 10% by removing the light shielding grille 118, the aperture ratio of the photocatalytic filter 54 is preferably 29% or more. Here, the illuminance at the measurement point P2 is 227.45 mW / cm as described above. 2 is used as a reference, the aperture ratio of the photocatalytic filter 54 at this time is approximately 38%. For this reason, it can be said that the aperture ratio of the photocatalytic filter 54 to be used is preferably approximately 29% to approximately 38%.

[0052] Similarly, assuming that the air volume is increased by 15% compared to when the light shielding grille 118 of the comparative example is present (see approximation line L0), as shown by the linear approximation line L3 in FIG. 8, when the opening ratio of the photocatalytic filter 54 falls below about 24%, the air volume of the air treatment device 100 of the comparative example in a predetermined mode is 1.90 m 3 / min or less. In other words, if it is assumed that the air volume increases by 15% by removing the light shielding grille 118, the aperture ratio of the photocatalytic filter 54 is preferably 24% or more. Here, the illuminance at the measurement point P2 is 227.45 mW / cm as described above. 2 is used as a reference, the aperture ratio of the photocatalytic filter 54 at this time is approximately 38%. For this reason, it can be said that the aperture ratio of the photocatalytic filter 54 to be used is preferably approximately 24% to approximately 38%.

[0053] Similarly, assuming that the air volume is increased by 20% compared to when the light shielding grill 118 of the comparative example is present (see approximation line L0), as shown by the linear approximation line L4 in FIG. 8, when the opening ratio of the photocatalytic filter 54 falls below approximately 20%, the air volume of the air treatment device 100 of the comparative example in a predetermined mode is 1.90 m 3 / min or less. In other words, if it is assumed that the air volume increases by 20% by removing the light shielding grille 118, the aperture ratio of the photocatalytic filter 54 is preferably 20% or more. Here, the illuminance at the measurement point P2 is 227.45 mW / cm as described above. 2 is used as a reference, the aperture ratio of the photocatalytic filter 54 at this time is approximately 38%. For this reason, it can be said that the aperture ratio of the photocatalytic filter 54 to be used is preferably approximately 20% to approximately 38%.

[0054] Similarly, assuming that the air volume is increased by 25% compared to when the light shielding grille 118 of the comparative example is present (see approximation line L0), as shown by the primary approximation line L5 in FIG. 8, when the opening ratio of the photocatalytic filter 54 falls below about 15%, the air volume of the air treatment device 100 of the comparative example in a predetermined mode is 1.90 m 3 / min or less. However, in this embodiment, the range in which the relationship between the aperture ratio of the photocatalytic filter 54 and the air volume is known to be linear is the range of aperture ratios of 20% or more. Therefore, if the air volume increases by 25% or more by removing the light-shielding grille 118, the lower limit of the aperture ratio can be set to 20%. Here, the illuminance at the measurement point P2 is 227.45 mW / cm as described above. 2 is used as a reference, the aperture ratio of the photocatalytic filter 54 at this time is approximately 38%. For this reason, it can be said that the aperture ratio of the photocatalytic filter 54 to be used is preferably approximately 20% to approximately 38%.

[0055] Therefore, in order to obtain an air processing capacity with the same performance as the air processing device 100 of the comparative example, it is preferable that the upper limit of the opening ratio (proportion of the opening area) of the openings 55 of the photocatalytic filter 54 of the air processing device 10 of this embodiment be set to approximately 38%, and the lower limit be set to approximately 34% to approximately 20%.

[0056] In the air treatment device 10 according to the present embodiment, the aperture ratio of the photocatalytic filter 54 is adjusted as described above, so that the illuminance of the light from the light source unit 14 is reduced to 227.45 mW / cm 2 Adjust the air volume to 1.90 m 3 / min or more. Therefore, the air treatment device 10 according to this embodiment, which does not have the light-shielding grill 118 of the air treatment device 100 according to the comparative example, can exhibit performance equivalent to or better than that of the air treatment device 100 according to the comparative example by using an opening ratio (proportion of the opening area) of the openings 55 of the photocatalyst filter 54 with an upper limit of about 38% and a lower limit of about 34% to about 20%. Furthermore, the air treatment device 10 according to this embodiment does not need to be provided with a light-shielding member such as the light-shielding grill 118, so the number of parts can be reduced.

[0057] In the air treatment device 10 according to the present embodiment, since the casing 12 is not provided with a light-shielding grill 118, the distance between the UV light source 34 and the photocatalytic filter 54 can be made larger than the distance between the UV light source 34 and the photocatalytic filter 54 of the air treatment device 100 according to the comparative example while maintaining the size of the casing 12. Therefore, the size of the circulating part 26 can be made larger without changing the size of the casing 12. At this time, more air can be irradiated with UV-C from the UV light source 34 per unit time. Therefore, according to the air treatment device 10 according to the present embodiment, not only is the light-shielding grill 118 eliminated, but the amount of air treatment per unit time can be increased compared to the air treatment device 100 according to the comparative example.

[0058] According to this embodiment, there is provided an air treatment device 10 that can control the illuminance of light such as ultraviolet light passing through the photocatalytic filter 54 and the air volume to a desired state. Therefore, the air treatment device 10 according to this embodiment can exhibit air treatment performance equal to or greater than that of the air treatment device 100 according to the comparative example, while maintaining the size of the housing 12.

[0059] Therefore, according to the present embodiment, an air treatment device 10 is provided that can reduce the number of parts while maintaining a desired air treatment performance.

[0060] Second embodiment An air treatment device 10 according to a second embodiment will be described with reference to Figures 9 to 14. The second embodiment is a modified example of the first embodiment, and the same components as those described in the first embodiment or those having the same functions are denoted by the same reference numerals as much as possible, and detailed descriptions thereof will be omitted.

[0061] The air treatment device 10 according to this embodiment has a different basic structure from the photocatalytic filter 54 described in the first embodiment. FIG. 9 shows the photocatalytic filter 54 of the air treatment device 10 according to this embodiment. The photocatalytic filter 54 according to this embodiment is formed as a porous filter, not as a honeycomb filter described in the first embodiment. The photocatalytic filter 54 as a porous filter has numerous pores (holes) inside. Due to its complex structure, the photocatalytic filter 54 as a porous filter is considered to be able to block ultraviolet light from the UV light source 34 to an appropriate illuminance even without a light-shielding grill 118 (see FIG. 3).

[0062] The outer shape of the photocatalytic filter 54 according to this embodiment is also formed in a shape having four side surfaces 54c between a pair of square surfaces 54a, 54b, similar to the photocatalytic filter 54 described in the first embodiment. The photocatalytic filter 54 in this embodiment has openings 55 on the ultraviolet light irradiated surface 54a and the opposite surface 54b, and also has openings 55 on the side surfaces 54c. The openings 55 appropriately connect the surfaces 54a, 54b, and 54c to each other.

[0063] FIG. 10 shows the illuminance at measurement point P2 of ultraviolet light that has passed through the photocatalytic filter 54 and prefilter 52 when the PPI (particles per inch: number of holes per inch) of the photocatalytic filter 54 according to this embodiment is 15, 20, and 30. The larger the PPI of the photocatalytic filter 54, the less light passes through it, and conversely, the smaller the PPI of the photocatalytic filter 54, the more light passes through it. When the PPI of the photocatalytic filter 54 is 0, it is equivalent to when there is no photocatalytic filter 54. When the PPI of the photocatalytic filter 54 is 100, it is equivalent to when the photocatalytic filter 54 is blocked.

[0064] Fig. 11 is a graph showing the relationship between the PPI of the photocatalytic filter 54 shown in Fig. 10 and the illuminance of ultraviolet light at the measurement point P2. It can be assumed that the illuminance changes linearly when the PPI of the photocatalytic filter 54 is between 15 and 20, and the slope is approximately -37.5. It can be assumed that the illuminance changes linearly when the PPI of the photocatalytic filter 54 is between 20 and 30, and the slope is approximately -1.4.

[0065] 12 shows the relationship between the PPI of the photocatalytic filter 54 of the air treatment device 10 according to this embodiment, calculated with a slope of approximately -37.5 when the PPI of the photocatalytic filter 54 is 15 to 20, and the illuminance of ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52. Also shown is the relationship between the PPI of the photocatalytic filter 54 of the air treatment device 10 according to this embodiment, calculated with a slope of approximately -1.4 when the PPI of the photocatalytic filter 54 is 20 to 100, and the illuminance of ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52. Also shown is the relationship between the PPI of the photocatalytic filter 54 of the air treatment device 10 according to this embodiment, calculated with a slope of approximately -106 when the PPI of the photocatalytic filter 54 is 0 to 15, and the illuminance of ultraviolet light passing through the photocatalytic filter 54 and the prefilter 52.

[0066] As described in the first embodiment, the light illuminance at the measurement point P2 when the aperture ratio of the photocatalytic filter 54 of the air treatment device 100 of the comparative example is 40% is 227.45 mW / cm 2 The PPI of the photocatalytic filter 54 with such an illuminance is approximately 16.97. If the illuminance at the measurement point P2 is 227.45 mW / cm 2 In order to satisfy the following, it is preferable that the PPI of the photocatalytic filter 54 of the air treatment device 10 according to this embodiment is a value of approximately 16.97 or more. In other words, it is preferable that the lower limit of the PPI of the photocatalytic filter 54 of the air treatment device 10 according to this embodiment is approximately 16.97. Note that the PPI here is the ratio of the area occupied by the base material of the photocatalytic filter 54 per 1 inch square area. When the PPI is 0, there are complete voids, and when the PPI is 100, there are no voids within 1 inch square.

[0067] FIG. 13 shows an example of the relationship between the PPI 15, 20, 30, 40, 50, and 60 of the photocatalytic filter 54 and the air volume at the measurement point P1 when a porous photocatalytic filter 54 is used in an air treatment device 100 having a light-shielding grille 118 according to a comparative example. FIG. 14 shows a graph (see symbol L0) including a linear approximation line showing the example of the relationship between the PPI and the air volume shown in FIG. 13. According to this, it can be seen that the air volume decreases approximately linearly as the PPI of the photocatalytic filter 54 increases. That is, it can be seen that when the PPI of the photocatalytic filter 54 is in the range of 15 to 60, as the PPI of the photocatalytic filter 54 increases, the air volume in the flow section 26 of the housing 12 (at the measurement point P1) decreases linearly.

[0068] In the air treatment device 100 (see FIG. 3) according to the comparative example having the light shielding grill 118, the air volume at the measurement point P1 in the flow section 26 of the housing 12 in one mode was 1.90 m3 as described in the first embodiment, regardless of the PPI of the photocatalytic filter 54 in the range of 15 to 60. 3 / min. The air volume at the measurement point P1 in the flow section 26 of the air treatment device 10 according to this embodiment is, for example, 1.90 m 3 , which is the air volume at the measurement point P1 of the air treatment device 100 of the comparative example described in the first embodiment. 3 For example, the air volume in the circulating unit 26 of the air treatment device 100 in the comparative example is a measured value of a ready-made product, and it is understood to be acceptable if it is equal to or greater than this value (strictly speaking, not only this value but also including an error of ± several percent).

[0069] The air treatment device 10 according to this embodiment is not provided with the light-shielding grill 118 (see FIG. 3) that is present in the comparative example of the air treatment device 100. Therefore, it is expected that the air volume per unit time at the measurement point P1, i.e., the air treatment volume, will be increased in the air treatment device 10 according to this embodiment compared to the comparative example of the air treatment device 100.

[0070] For example, removing the light-shielding grill 118 from the air treatment device 100 of the comparative example results in the air treatment device 10 according to this embodiment. If it is assumed that removing the light-shielding grill 118 increases the air volume by 10%, 15%, 20%, 30%, 40%, and 50%, respectively, the relationship between the PPI of the photocatalytic filter 54 and the air volume is obtained as shown in Fig. 14. The approximation lines for PPIs of 15, 20, 30, 40, 50, and 60 are designated by symbols L1, L2, L3, L4, L5, and L6, respectively.

[0071] For example, even if it is assumed that the air volume increases by 10% compared to when the light shielding grill 118 of the comparative example is present (see approximation line L0), as shown by the linear approximation line L1 in FIG. 14, when the PPI of the photocatalytic filter 54 is in the range of 15 to 60, the air volume of 1.90 m3 in the predetermined mode of the air treatment device 100 of the comparative example is 1.90 m3. 3 / min or less.

[0072] For example, if it is assumed that the air volume increases by 15% compared to when the light shielding grill 118 of the comparative example is present (see approximation line L0), the air volume will be 1.90 m3 as shown by the linear approximation line L2 in FIG. 3 / min, the PPI of the photocatalytic filter 54 is approximately 19.2. In other words, assuming that the air volume increases by 15% by removing the light shielding grille 118, it is preferable that the PPI of the photocatalytic filter 54 is approximately 19.2 or less. Here, the illuminance at the measurement point P2 is 227.45 mW / cm as described above. 2 Based on this, the PPI of the photocatalytic filter 54 is approximately 16.97. For this reason, it can be said that the PPI of the photocatalytic filter 54 used is preferably from approximately 16.97 to approximately 19.2.

[0073] Similarly, for example, if it is assumed that the air volume increases by 20% compared to when the light shielding grill 118 of the comparative example is present (see approximation line L0), the air volume increases to 1.90 m3 as shown by the linear approximation line L3 in FIG. 3 / min, the PPI of the photocatalytic filter 54 is approximately 30.4. In other words, assuming that the air volume increases by 20% by removing the light-shielding grille 118, the PPI of the photocatalytic filter 54 is preferably approximately 30.4 or less. Therefore, it can be said that the PPI of the photocatalytic filter 54 used is preferably approximately 16.97 to approximately 30.4.

[0074] Similarly, for example, if it is assumed that the air volume increases by 30% compared to when the light shielding grill 118 of the comparative example is present (see approximation line L0), the air volume will be 1.90 m3 as shown by the linear approximation line L4 in FIG. 3 / min, the PPI of the photocatalytic filter 54 is approximately 50.4. In other words, assuming that the air volume increases by 30% by removing the light shielding grille 118, the PPI of the photocatalytic filter 54 is preferably approximately 50.4 or less. Therefore, it can be said that the PPI of the photocatalytic filter 54 used is preferably approximately 16.97 to approximately 50.4.

[0075] Similarly, for example, if it is assumed that the air volume increases by 40% compared to when the light shielding grill 118 of the comparative example is present (see approximation line L0), the air volume increases to 1.90 m3 as shown by the linear approximation line L5 in FIG. 3 / min, the PPI of the photocatalytic filter 54 is approximately 67.4. In this embodiment, the range in which the relationship between the PPI of the photocatalytic filter 54 and the air volume is known to be linear is the PPI range of 15 to 60. Therefore, if the air volume increases by 40% by removing the light-shielding grille 118, the upper limit of the PPI can be set to 60. Therefore, it can be said that the PPI of the photocatalytic filter 54 used is preferably approximately 16.97 to approximately 60.

[0076] Similarly, for example, if it is assumed that the air volume increases by 50% compared to when the light shielding grill 118 of the comparative example is present (see approximation line L0), the air volume will be 1.90 m3 as shown by the linear approximation line L6 in FIG. 3 / min, the PPI of the photocatalytic filter 54 is approximately 82.2. In this embodiment, the range in which the relationship between the PPI of the photocatalytic filter 54 and the air volume is known to be linear is the PPI range of 15 to 60. Therefore, if the air volume increases by 50% by removing the light-shielding grille 118, the upper limit of the PPI can be set to 60. Therefore, it can be said that the PPI of the photocatalytic filter 54 used is preferably approximately 16.97 to approximately 60.

[0077] Therefore, in order to obtain an air processing capacity with the same performance as the air processing device 100 of the comparative example, it is preferable that the lower limit of the PPI of the photocatalytic filter 54 of the air processing device 10 of this embodiment is set to approximately 16.97, and the upper limit is set to approximately 19.2 to approximately 60.

[0078] In the air treatment device 10 according to the present embodiment, the illuminance of the light from the light source unit 14 is adjusted to 227.45 mW / cm by adjusting the PPI of the photocatalytic filter 54 as described above. 2 Adjust the air volume to 1.90 m 3 / min or more. Therefore, the air treatment device 10 according to this embodiment, which does not have the light-shielding grill 118 of the air treatment device 100 according to the comparative example, can exhibit performance equivalent to or better than that of the air treatment device 100 according to the comparative example by using a photocatalytic filter 54 with a lower limit of PPI of about 16.97 and an upper limit of about 19.2 to about 60. Furthermore, the air treatment device 10 according to this embodiment does not need to be provided with a light-shielding member such as the light-shielding grill 118, so the number of parts can be reduced.

[0079] In the air treatment device 10 according to the present embodiment, since the casing 12 is not provided with a light-shielding grill 118, the distance between the UV light source 34 and the photocatalytic filter 54 can be made larger than the distance between the UV light source 34 and the photocatalytic filter 54 of the air treatment device 100 according to the comparative example while maintaining the size of the casing 12. Therefore, the size of the circulating part 26 can be made larger without changing the size of the casing 12. At this time, more air can be irradiated with UV-C from the UV light source 34 per unit time. Therefore, according to the air treatment device 10 according to the present embodiment, not only is the light-shielding grill 118 eliminated, but the amount of air treatment per unit time can be increased compared to the air treatment device 100 according to the comparative example.

[0080] According to this embodiment, there is provided an air treatment device 10 that can control the illuminance of light such as ultraviolet light passing through the photocatalytic filter 54 and the air volume to a desired state. Therefore, the air treatment device 10 according to this embodiment can exhibit air treatment performance equal to or greater than that of the air treatment device 100 according to the comparative example, while maintaining the size of the housing 12.

[0081] Thus, in accordance with at least one of the embodiments described above, an air treatment device 10 is provided that can reduce the number of parts while maintaining a desired air treatment performance.

[0082] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0083] 10...air treatment device, 12...housing, 14...light source section, 16...filter section, 22...air intake port, 24...exhaust port, 26...air treatment tank (circulation section), 32...light source board, 34...UV light source, 40...fan, 52...prefilter, 54...photocatalytic filter, 54a...ultraviolet light irradiated surface, 54b...opposite surface, 54c...side, 55...opening, 100...air treatment device, 118...shade grill.

Claims

1. a housing including an air vent for introducing air and an exhaust port for discharging the air, the air vent and the exhaust port being connected to each other and allowing the air to circulate inside; a light source unit disposed within the housing and configured to irradiate ultraviolet light in a predetermined direction; A substrate having an ultraviolet light irradiated surface on which the ultraviolet light is irradiated from the light source unit and an opposite surface opposite to the ultraviolet light irradiated surface, the substrate supporting a photocatalyst; an opening provided in the base material so as to connect the ultraviolet light irradiated surface and the opposite surface, the opening being provided so that an opening ratio of the ultraviolet light irradiated surface to an area of ​​the ultraviolet light irradiated surface is an upper limit of approximately 38% and a lower limit of approximately 34% to approximately 20%; a filter disposed in the housing so as to intersect with a flow direction of the air; and no light blocking member is provided upstream of the filter along the air flow direction.

2. a housing including an air vent for introducing air and an exhaust port for discharging air, the air vent and the exhaust port being connected to each other and allowing the air to circulate inside; a light source unit disposed within the housing and configured to irradiate ultraviolet light in a predetermined direction; A substrate having an ultraviolet light irradiated surface on which the ultraviolet light is irradiated from the light source unit, an opposite surface opposite to the ultraviolet light irradiated surface, and a side surface formed as a surface between the ultraviolet light irradiated surface and the opposite surface, and carrying a photocatalyst; an opening provided in the base material so as to connect the ultraviolet light irradiated surface and the opposite surface, or so as to connect the ultraviolet light irradiated surface and the opposite surface via the side surface, the opening being provided so that a lower limit of PPI for the ultraviolet light irradiated surface is approximately 16.97 and an upper limit of PPI for the ultraviolet light irradiated surface is approximately 19.2 to approximately 60; a filter disposed in the housing so as to intersect with a flow direction of the air; and no light blocking member is provided upstream of the filter along the air flow direction.

3. The air volume between the filter and the light source unit in the housing is 1.9 m ３ / min or more, The illuminance of the ultraviolet light from the light source through the filter is 227.45 mW / cm ２ Below is the 3. An air treatment device according to claim 1 or claim 2.

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