Ultraviolet irradiation unit

Abstract

To provide an ultraviolet irradiation device capable of suppressing deterioration of an irradiation part due to reflected ultraviolet light.SOLUTION: The ultraviolet irradiation unit includes: an irradiation part (60) that is disposed at one end side in a first direction of a sterilization space (S) and emits ultraviolet rays toward the other end side in the first direction; and a first reflection part (71) that is disposed at the other end side in the first direction of the sterilization space (S) and reflects the ultraviolet rays emitted from the irradiation part (60) so that the ultraviolet rays return to the one end side in the first direction. The optical axis of the reflected light from the first reflection part (71) is shifted by a first angle θ1 toward one end in a second direction perpendicular to the first direction with respect to the optical axis of the ultraviolet rays from the irradiation part (60).SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to an ultraviolet irradiation unit, an air conditioning device, and an air duct. [Background technology]

[0002] The ultraviolet irradiation unit disclosed in Patent Document 1 includes an ultraviolet light emitting diode that irradiates ultraviolet light, and a reflecting section that reflects the ultraviolet light irradiated from the ultraviolet light emitting diode. As shown in FIG. 1 of the same document, the ultraviolet light irradiated from the ultraviolet light emitting diode is converted into parallel light and then reflected by the reflecting section. The reflected ultraviolet light is sent to the ultraviolet light emitting diode side along the optical axis of the parallel light. The ultraviolet light traveling back and forth between the ultraviolet light emitting diode and the reflecting section is irradiated to the air flowing between them, thereby inactivating bacteria and viruses in the air. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-160292 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the ultraviolet unit disclosed in Patent Document 1, the ultraviolet light reflected by the reflecting section is reflected in a direction along the optical axis of the ultraviolet light emitted from the irradiating section. This makes it easier for the ultraviolet light reflected by the reflecting section to hit the irradiating section, causing the irradiating section to deteriorate due to the ultraviolet light.

[0005] An object of the present disclosure is to provide an ultraviolet irradiation device capable of suppressing deterioration of an irradiation unit due to reflected ultraviolet light. [Means for solving the problem]

[0006] The first aspect is directed to an ultraviolet irradiation unit (50). The ultraviolet irradiation unit (50) includes a flow path forming member (51) in which a sterilization space (S) through which air flows is formed, an irradiation section (60) that is disposed at one end of the sterilization space (S) in a first direction and irradiates ultraviolet rays toward the other end in the first direction, and a first reflection section (71) that is disposed at the other end of the sterilization space (S) in the first direction and reflects the ultraviolet rays irradiated from the irradiation section (60) so that the ultraviolet rays return to the one end in the first direction. The optical axis of the reflected light of the first reflection section (71) is shifted by a first angle θ1 toward one end in a second direction perpendicular to the first direction with respect to the optical axis of the ultraviolet rays of the irradiation section (60).

[0007] In the first aspect, ultraviolet light emitted from the irradiating section (60) is reflected by the first reflecting section (71) and then returns to the irradiating section (60). The optical axis of the reflected light from the first reflecting section (71) is shifted by a first angle in the second direction with respect to the optical axis of the ultraviolet light from the irradiating section (60), so that it is possible to prevent the reflected light from hitting the irradiating section (60). As a result, it is possible to prevent the irradiating section (60) from being deteriorated by the reflected ultraviolet light.

[0008] In a second aspect, in the first aspect, a first length of the sterilization space (S) in the first direction is greater than a second length of the sterilization space (S) in the second direction.

[0009] The sterilization space (S) in the second aspect is longer in the direction in which the ultraviolet light irradiated from the irradiating unit (60) and the reflected light from the first reflecting unit (71) travel. This makes it possible to ensure a distance over which the ultraviolet light irradiated from the irradiating unit (60) is attenuated by reflection from the first reflecting unit (71), thereby improving the sterilization effect of the air in the sterilization space (S).

[0010] The third aspect is the second aspect, wherein a third length of the sterilization space (S) in a third direction perpendicular to the first direction and the second direction is smaller than the first length and the second length, and the flow path forming member (51) is configured so that air flows through the sterilization space (S) from one side to the other side in the third direction.

[0011] In the third aspect, the length of the air flow path through the sterilization space (S) is shortened and the cross-sectional area of ​​the flow path is increased, so that the air flow path resistance can be reduced.

[0012] In a fourth aspect, in the first or second aspect, the flow path forming member (51) is configured so that air flows through the sterilization space (S) from one side to the other side in the first direction.

[0013] In the fourth aspect, when the ultraviolet irradiation unit is applied inside a duct or the like through which air flows, the flow resistance of the air can be reduced.

[0014] In the fifth aspect, in any one of the first to fourth aspects, when the distance in the second direction from a first surface (54), which is the inner surface at one end side of the sterilization space (S) in the second direction, to an origin P1 of the ultraviolet light of the irradiation section (60) is L and the distance in the second direction from the origin P1 to an origin P2 of the reflected light of the first reflection section (71) is b, the relationship b≦L / 2 is satisfied.

[0015] In the fifth aspect, it is possible to prevent the light reflected by the first reflecting portion (71) from impinging on the first surface (54).

[0016] In a sixth aspect, in any one of the first to fifth aspects, when a distance in the second direction from a first surface (54), which is an inner surface at one end side in the second direction in the sterilization space (S), to an origin P1 of the ultraviolet light of the irradiation unit (60) is defined as L, and a distance in the first direction from the origin P1 to an origin P2 of the reflected light of the first reflection unit (71) is defined as a, a first angle θ1<2tan -1 The relationship (L / 2a) is satisfied.

[0017] In the sixth aspect, it is possible to prevent the light reflected by the first reflecting portion (71) from impinging on the first surface (54).

[0018] A seventh aspect is any one of the first to fourth aspects, further comprising a second reflecting part (80) that is arranged at one end side of the first direction of the sterilization space (S) and reflects ultraviolet light irradiated from the first reflecting part (71) toward the other end side of the first direction, and the optical axis of the reflected light of the second reflecting part (80) is shifted by a second angle θ2 toward the one end side of the second direction with respect to the optical axis of the first reflecting part (71).

[0019] In the seventh aspect, the ultraviolet light reflected by the first reflecting portion (71) is further reflected by the second reflecting portion (80) so as to be shifted toward one end in the second direction, thereby expanding the range of the ultraviolet light in the second direction.

[0020] An eighth aspect is any one of the first to seventh aspects, wherein the first angle θ1 is 30° or less.

[0021] In the eighth aspect, it is possible to prevent the light reflected by the first reflecting portion (71) from impinging on the first surface (54).

[0022] A ninth aspect is any one of the first to eighth aspects, wherein the reflectance of ultraviolet light at the first reflecting portion (71) is 50% or more.

[0023] In the ninth aspect, it is possible to prevent the illuminance of the reflected light from attenuating due to the reflection of the ultraviolet light by the first reflecting portion (71).

[0024] A tenth aspect is an air conditioner including the ultraviolet irradiation unit (50) according to any one of the first to ninth aspects.

[0025] An eleventh aspect is the air conditioning device of the tenth aspect, further comprising an air conditioning casing (30a) in which an air passage (43) is formed, and the flow path forming member (51) is disposed in the air passage (43). As a result, the sterilization space (S) is located inside both the flow path forming member (51) and the air conditioning casing (30a). This makes it possible to prevent ultraviolet light in the sterilization space (S) from leaking out of the air conditioning casing (30a).

[0026] A twelfth aspect is an air duct provided with the ultraviolet irradiation unit (50) according to any one of the first to ninth aspects. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a piping diagram of an air conditioner according to an embodiment. [Diagram 2] FIG. 2 is a perspective view showing the external appearance of the indoor unit. [Diagram 3] FIG. 3 is a cross-sectional view showing the internal structure of the indoor unit. [Figure 4] FIG. 4 is a perspective view showing the configuration of the ultraviolet irradiation unit. [Diagram 5] FIG. 5 is a plan view showing the internal structure of the ultraviolet irradiation unit. [Figure 6] FIG. 6 is a schematic diagram of the irradiation unit. [Figure 7] FIG. 7 is a schematic configuration diagram of an irradiation unit according to Modification 1A. [Figure 8] FIG. 8 is a schematic configuration diagram of an irradiation unit according to Modification 1B. [Figure 9] FIG. 9 is a plan view showing the internal structure of the ultraviolet irradiation unit in the second modification. [Figure 10] FIG. 10 is a plan view showing the internal structure of the ultraviolet irradiation unit according to the third modification. [Figure 11] FIG. 11 is a perspective view showing a configuration of an ultraviolet irradiation unit according to the fourth modification. [Figure 12] FIG. 12 is a plan view showing the internal structure of the ultraviolet irradiation unit according to the fifth modification. [Figure 13] FIG. 13 is a plan view showing the internal structure of the ultraviolet irradiation unit according to the sixth modification. [Figure 14] FIG. 14 is a plan view showing an internal structure of an ultraviolet irradiation unit according to an example of the seventh modification. [Figure 15] FIG. 15 is a plan view showing an internal structure of an ultraviolet irradiation unit according to another example of the seventh modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical idea of ​​the present disclosure. Since each drawing is intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for easy understanding.

[0029] (1) Air conditioning system configuration The ultraviolet irradiation unit (50) of the present disclosure is applied to an air conditioner (10). The air conditioner (10) conditions the air in an indoor space, which is a target space. The air conditioner (10) adjusts the temperature of the air in the room.

[0030] (1-1) Overall structure As shown in FIG. 1, the air conditioner (10) has an outdoor unit (20), an indoor unit (30), a first connecting pipe (12), and a second connecting pipe (13). The air conditioner (10) is a pair type having one outdoor unit (20) and one indoor unit (30). The first connecting pipe (12) is a gas connecting pipe, and the second connecting pipe (13) is a liquid connecting pipe. The outdoor unit (20) and the indoor unit (30) are connected to each other via the first connecting pipe (12) and the second connecting pipe (13), thereby forming a refrigerant circuit (11). The refrigerant circuit (11) performs a refrigeration cycle by circulating a refrigerant. The refrigerant is, for example, difluoromethane.

[0031] (1-2) Outdoor unit The outdoor unit (20) is installed outdoors. The outdoor unit (20) has an outdoor casing (20a), a compressor (21), an outdoor heat exchanger (22), an expansion valve (23), a four-way switching valve (24), and an outdoor fan (25). The outdoor casing (20a) houses the compressor (21), the outdoor heat exchanger (22), the expansion valve (23), the four-way switching valve (24), and the outdoor fan (25).

[0032] The compressor (21) is a rotary compressor such as a swing piston type, a rotary type, or a scroll type. The outdoor heat exchanger (22) is a fin-and-tube type. The four-way switching valve (24) switches between a first state (a state shown by a solid line in FIG. 1) and a second state (a state shown by a dashed line in FIG. 1). In the first state, the four-way switching valve (24) communicates the discharge portion of the compressor (21) with the gas end of the outdoor heat exchanger (22) and also communicates the suction portion of the compressor (21) with the first connecting pipe (12). In the second state, the four-way switching valve (24) communicates the discharge portion of the compressor (21) with the first connecting pipe (12) and also communicates the suction portion of the compressor (21) with the gas end of the outdoor heat exchanger (22). The outdoor fan (25) is a propeller fan.

[0033] (1-3) Indoor unit 2 and 3, the indoor unit (30) is installed in an indoor space (I). The indoor unit (30) is a wall-mounted indoor air conditioner installed on a wall of the indoor space (I). The indoor unit (30) includes an indoor casing (30a), an air filter (31), an indoor heat exchanger (32), an indoor fan (33), a drain pan (34), and a flap (35).

[0034] The indoor casing (30a) constitutes an air conditioning casing. The indoor casing (30a) is formed in a horizontally elongated hollow shape. The longitudinal direction of the indoor casing (30a) is the left-right direction. The indoor casing (30a) houses an air filter (31), an indoor heat exchanger (32), an indoor fan (33), a drain pan (34), and a flap (35). The indoor casing (30a) is formed with an inlet (41) and an outlet (42). The inlet (41) is formed in an upper portion of the indoor casing (30a). The inlet (41) is an opening for drawing air from the indoor space (I). The inlet (41) extends in the longitudinal direction of the indoor casing (30a). The outlet (42) is formed in a lower portion of the indoor casing (30a) toward the front. The air outlet (42) extends in the longitudinal direction of the indoor casing (30a). An air passage (43) is formed inside the indoor casing (30a) between the suction opening (41) and the air outlet (42).

[0035] The air filter (31) is disposed upstream of the indoor heat exchanger (32) in the air passage (43). The air filter (31) is a mesh-like member formed along the inlet (41). The air filter (31) collects dust in the air sucked in through the inlet (41).

[0036] The indoor heat exchanger (32) is disposed upstream of the indoor fan (33) in the air passage (43). The indoor heat exchanger (32) is a fin-and-tube type heat exchanger. The indoor heat exchanger (32) exchanges heat between the refrigerant flowing therethrough and the air transported by the indoor fan (33).

[0037] The indoor fan (33) is an example of a blower. The indoor fan (33) is a cross-flow fan. The indoor fan (33) extends in the longitudinal direction of the indoor casing (30a). The indoor fan (33) is driven to rotate by a fan motor (33a). The indoor fan (33) transports air in the air passage (43). When the indoor fan (33) is driven, air in the indoor space (I) is sucked into the air passage (43) and flows through the air passage (43). At the same time, the air in the air passage (43) is blown out through the air outlet (42). The indoor fan (33) is configured to be able to adjust the volume of the blown air supplied to the indoor space (I) through the air outlet (42).

[0038] The drain pan (34) is disposed below the indoor heat exchanger (32). The drain pan (34) is a tray that receives water generated in the indoor casing (30a). The drain pan (34) receives condensation water generated on the surface of the indoor heat exchanger (32).

[0039] The flap (35) constitutes an airflow direction adjustment unit that adjusts the direction of the blown air. The flap (35) adjusts the vertical direction of the blown air. The flap (35) may adjust the horizontal direction of the blown air.

[0040] (2) Ultraviolet irradiation unit The indoor unit (30) of the air conditioner (10) includes an ultraviolet ray irradiation unit (50). The ultraviolet ray irradiation unit (50) inactivates bacteria and viruses in the air by ultraviolet light. As shown in FIG. 3, the ultraviolet ray irradiation unit (50) is accommodated inside the indoor casing (30a). The ultraviolet ray irradiation unit (50) is disposed in the air passage (43). Specifically, the ultraviolet ray irradiation unit (50) is disposed upstream of the indoor heat exchanger (32) in the air passage (43).

[0041] As shown in FIGS. 4 and 5, the ultraviolet ray irradiation unit (50) includes a casing (51) which is a flow path forming member, an irradiation section (60), and a first reflecting section (71).

[0042] (2-1) Casing A sterilization space (S) through which air to be sterilized by ultraviolet light flows is formed inside the casing (51). The casing (51) is formed in a hollow rectangular parallelepiped shape. The casing (51) extends along the longitudinal direction (left-right direction) of the indoor unit (30). As shown in FIG. 4, the longitudinal direction of the casing (51) corresponds to the left-right direction or the longitudinal direction of the indoor casing (30a). In this embodiment, the thickness direction of the casing (51) corresponds to the direction of air flow in the sterilization space (S). The width direction of the casing (51) corresponds to the direction perpendicular to the longitudinal direction and thickness direction of the casing (51).

[0043] An inlet (52) is formed in a first casing surface (51a) at one end in the thickness direction of the casing (51). The inlet (52) is formed over substantially the entire area of ​​the first casing surface (51a). An outlet (53) is formed in a second casing surface (51b) at the other end in the thickness direction of the casing (51). The outlet (53) is formed over substantially the entire area of ​​the second casing surface (51b). Inside the casing (51), a sterilized space (S) is formed between the inlet (52) and the outlet (53). The inlet (52) and the outlet (53) face each other with the sterilized space (S) interposed therebetween.

[0044] The inlet (52) faces the suction port (41) of the indoor casing (30a). The inlet (52) faces the downstream surface of the air filter (31). The outlet (53) faces the air inlet surface of the indoor heat exchanger (32).

[0045] The sterilization space (S) is a rectangular parallelepiped space. The longitudinal direction of the sterilization space (S) corresponds to the left-right direction or the longitudinal direction of the indoor casing (30a). The thickness direction of the sterilization space (S) corresponds to the direction of air flow in the sterilization space (S). The width direction of the sterilization space (S) corresponds to a direction perpendicular to the longitudinal direction and thickness direction of the sterilization space (S). In this embodiment, the longitudinal direction of the sterilization space (S) is a first direction, the width direction of the sterilization space (S) is a second direction, and the thickness direction of the sterilization space (S) is a third direction.

[0046] The casing (51) has six inner surfaces facing the sterilization space (S) formed inside. As shown in Figs. 4 and 5, the six inner surfaces include a first surface (54), a second surface (55), a third surface (56), and a fourth surface (57). The first surface (54) is formed at one end of the sterilization space (S) in the second direction. The second surface (55) is formed at the other end of the sterilization space (S) in the second direction. The third surface (56) is formed at one end of the sterilization space (S) in the first direction. The fourth surface (57) is formed at the other end of the sterilization space (S) in the first direction.

[0047] (2-2) Irradiation unit As shown in FIG. 6, the irradiation section (60) includes an LED (Light Emitting Diode) (61), a reflector (62) which is an example of a light distribution control section (D), and a circuit board (63) which controls the LED (61).

[0048] The LED (61) is a light source that irradiates ultraviolet light. The peak wavelength of the ultraviolet light irradiated by the LED (61) is 280 nm or less. This can improve the sterilizing effect of the air. The peak wavelength of the ultraviolet light irradiated by the LED (61) is preferably 255 nm or more and 275 nm or less. This can improve the sterilizing effect of the air in particular. The peak wavelength of the ultraviolet light irradiated by the LED (61) may be 230 nm or less. This can improve the safety of exposure to the human body in the event that the ultraviolet light leaks outside the indoor casing (30a).

[0049] The reflector (62) is a curved reflecting plate that reflects the ultraviolet light emitted from the LED (61). In this embodiment, the LED (61) faces the reflector (62). The reflector (62) reflects the ultraviolet light emitted from the LED (61) and distributes the ultraviolet light so that the ultraviolet light emitted from the irradiation unit (60) faces the first optical axis (A1).

[0050] The circuit board (63) includes a control board for controlling the LEDs (61). Specifically, the circuit board (63) includes a control device for switching the LEDs (61) on and off and adjusting the output of the LEDs (61). The control device of the circuit board (63) may be provided in an air conditioning controller for controlling the air conditioner (10).

[0051] The LEDs (61) and the circuit board (63) may be provided with a heat dissipation member for suppressing an increase in temperature of the LEDs (61).

[0052] (2-3) 1st reflection section The first reflecting portion (71) reflects the ultraviolet light emitted from the irradiating portion (60). Strictly speaking, the first reflecting portion (71) reflects the ultraviolet light distributed by the light distribution control portion (D). The first reflecting portion (71) is a reflective member having a reflective surface (72) facing the irradiating portion (60). It is preferable that the reflectance of the first reflecting portion (71) with respect to ultraviolet light is 50% or more. Here, the reflectance R is expressed by the following formula (1).

[0053] R[%]=(E2 / E1)×100...Equation (1) Here, E1 is the amount of ultraviolet light [mW] that enters the reflecting part, and E2 is the amount of ultraviolet light [mW] that is reflected by the reflecting part.

[0054] (3) Operation of air conditioners The air conditioner (10) performs cooling operation and heating operation.

[0055] (3-1) Cooling operation The cooling operation is an operation for cooling the air in the indoor space (I) to approach a set temperature (target temperature). In the cooling operation, the four-way switching valve (24) is in the first state. The refrigerant compressed by the compressor (21) dissipates heat in the outdoor heat exchanger (22) and is then reduced in pressure by the expansion valve (23). The reduced-pressure refrigerant evaporates in the indoor heat exchanger (32). The air cooled by the indoor heat exchanger (32) is supplied to the indoor space (I). The refrigerant evaporated in the indoor heat exchanger (32) is sucked into the compressor (21).

[0056] (3-2) Heating operation The heating operation is an operation for heating the air in the indoor space (I) to approach a set temperature (target temperature). In the heating operation, the four-way switching valve (24) is in the second state. In the heating operation, the refrigerant compressed by the compressor (21) dissipates heat in the indoor heat exchanger (32) and is then reduced in pressure by the expansion valve (23). The air heated by the indoor heat exchanger (32) is supplied to the indoor space (I). The reduced-pressure refrigerant evaporates in the outdoor heat exchanger (22) and is then sucked into the compressor (21).

[0057] (4) Detailed layout of the UV irradiation unit The layout of the irradiation section (60) and the first reflection section (71) in the sterilization space (S) will be described in detail with reference to FIGS.

[0058] (4-1) Irradiation unit The irradiation unit (60) is disposed at one end side in the first direction of the sterilization space (S). The irradiation unit (60) is disposed between a middle position in the first direction of the sterilization space (S) and the third surface (56). Specifically, the irradiation unit (60) is disposed in the vicinity of the third surface (56). The irradiation unit (60) is preferably fixed to the third surface (56).

[0059] The irradiation section (60) is disposed closer to the second surface (55). The irradiation section (60) is disposed between the second surface (55) and a middle position in the second direction in the sterilization space (S). The irradiation section (60) is disposed in the vicinity of the second surface (55).

[0060] The irradiation section (60) irradiates the sterilization space (S) with ultraviolet light from one end to the other end in the first direction. A first optical axis (A1) of the ultraviolet light from the irradiation section (60) is directed toward the fourth surface (57). The first optical axis (A1) is inclined toward the first surface (54) with respect to the first direction.

[0061] (4-2) 1st reflection section The first reflecting portion (71) is disposed at the other end side in the first direction of the sterilization space (S). The first reflecting portion (71) is disposed between a middle position in the sterilization space (S) in the first direction and the fourth surface (57). The first reflecting portion (71) is disposed near the fourth surface (57). The first reflecting portion (71) is disposed at a middle position in the second direction of the sterilization space (S). The first reflecting portion (71) is preferably fixed to the fourth surface (57).

[0062] The first reflecting portion (71) reflects ultraviolet light from the other end side toward one end side in the first direction of the sterilization space (S). The first reflecting portion (71) faces one end side in the first direction and has a reflecting surface (71a) that reflects ultraviolet light. A second optical axis (A2) of the ultraviolet light reflected by the first reflecting portion (71) is directed toward the third surface (56). The second optical axis (A2) is inclined toward the first surface (54) with respect to the first direction. The ultraviolet light reflected by the first reflecting portion (71) returns to the one end side in the first direction of the sterilization space (S). The ultraviolet light reflected by the first reflecting portion (71) reaches the third surface (56).

[0063] (4-3) Relationship between angles and dimensions The second optical axis (A2) of the ultraviolet light reflected by the first reflecting portion (71) is shifted by a first angle θ1 toward one end in the second direction with respect to the first optical axis (A1) of the ultraviolet light from the irradiating portion (60). This makes it possible to prevent the ultraviolet light reflected from the first reflecting portion (71) from hitting the irradiating portion (60). In this manner, the first angle θ1 is set to an angle at which the second optical axis (A2) of the first reflecting portion (71) does not overlap with the irradiating portion (60).

[0064] The first angle θ1 is a predetermined angle greater than 0°. By making the first angle θ1 greater than 0°, the ultraviolet rays reflected from the first reflecting portion (71) are less likely to hit the irradiating portion (60) compared to when the first angle θ1 is 0°, and deterioration of the irradiating portion (60) can be suppressed. The first angle θ1 is preferably 1° or more, and may be, for example, 2° or 3°.

[0065] The distance in the second direction from the first surface (54) to the origin P1 of the ultraviolet light from the irradiation section (60) is defined as L. The distance in the second direction from the point P1 to the origin P2 of the reflected light from the first reflecting section (71) is defined as b. In this case, the ultraviolet irradiation unit (50) satisfies the relationship of the following formula (2).

[0066] b≦L / 2···(2) formula If b were greater than L / 2, there would be a possibility that the ultraviolet light reflected by the first reflecting portion (71) would reach the first surface (54). In contrast, in this embodiment, b is equal to or less than L / 2, so that the ultraviolet light reflected by the first reflecting portion (71) can be prevented from reaching the first surface (54), and the ultraviolet light can be caused to reach the third surface (56). As a result, in the sterilization space (S), the ultraviolet light reflected by the first reflecting portion (71) is irradiated to both ends in the first direction, and the space of the sterilization space (S) can be effectively utilized.

[0067] Furthermore, the distance in the first direction from the first surface (54) to the origin P1 of the ultraviolet light of the irradiation section (60) to the origin P2 of the reflected light of the first reflecting section (71) is denoted by a. In this case, the ultraviolet irradiation unit (50) satisfies the relationship of the following formula (3).

[0068] 1st angle θ1<2tan -1 (L / 2a)...Equation (3) The first angle θ1 is 2tan -1 If the first angle θ1 is equal to or larger than (L / 2a), there is a possibility that the ultraviolet light reflected by the first reflecting portion (71) may reach the first surface (54). -1 Since this is smaller than (L / 2a), the ultraviolet light reflected by the first reflecting portion (71) can be prevented from reaching the first surface (54), and the ultraviolet light can be allowed to reach the third surface (56). As a result, in the sterilization space (S), the ultraviolet light reflected by the first reflecting portion (71) is irradiated to both ends in the first direction, and the space of the sterilization space (S) can be used effectively.

[0069] The first angle θ1 is preferably equal to or less than 30°. This reliably prevents the ultraviolet light reflected by the first reflecting portion (71) from reaching the first surface (54). The first angle θ1 may be equal to or less than 3°.

[0070] (5) Operation of the ultraviolet irradiation unit The ultraviolet irradiation unit (50) operates when the air conditioner (10) is in operation. The control device of the circuit board (63) turns on the LED (61) in cooling or heating operation. When the indoor fan (33) is operated in cooling or heating operation, a portion of the air sucked from the indoor space (I) through the air inlet (41) is sucked into the casing (51) of the ultraviolet irradiation unit (50). Specifically, the air in the air passage (43) flows into the sterilization space (S) through the inlet (52) of the casing (51).

[0071] When the LED (61) is turned on, the ultraviolet light emitted from the LED (61) is distributed by the reflector (62). The distributed ultraviolet light travels toward the fourth surface (57) as parallel light of the first optical axis (A1). The ultraviolet light reflected by the first reflecting portion (71) travels toward the third surface (56) as parallel light of the second optical axis (A2) that forms a first angle θ1 with the first optical axis (A1). In this manner, in the sterilizing space (S), the ultraviolet light of the first optical axis (A1) irradiated from the irradiating portion (60) and the ultraviolet light of the second optical axis (A2) reflected by the first reflecting portion (71) are irradiated across the third surface (56) and the fourth surface (57) of the sterilizing space (S). The ultraviolet light of the first optical axis (A1) and the second optical axis (A2) advance in a direction along the longitudinal direction of the sterilizing space (S). In addition, the first optical axis (A1) and the second optical axis (A2) are offset in angle from the second surface (55) side toward the first surface (54) side, which makes it possible to expand the ultraviolet ray irradiation area in the sterilizing space (S).

[0072] In the sterilizing space (S), the air flowing in the thickness direction (third direction) is exposed to ultraviolet light. As a result, bacteria and viruses in the air are inactivated. The air in the sterilizing space (S) flows out through the outlet (53). The flowed-out air is cooled or heated in the indoor heat exchanger (32) and then supplied to the indoor space (I) through the air outlet (42).

[0073] (6) Effects of the embodiment The second optical axis (A2) of the reflected light of the first reflecting portion (71) is shifted by a first angle θ1 toward one end side in the second direction perpendicular to the first direction with respect to the first optical axis (A1) of the ultraviolet light of the irradiating portion (60). This makes it possible to prevent the reflected light reflected by the first reflecting portion (71) from hitting the irradiating portion (60). As a result, it is possible to prevent the irradiating portion (60) from being deteriorated by the ultraviolet light. In addition, the ultraviolet light reflected by the first reflecting portion (71) returns to the one end side in the first direction, so that it is possible to prevent the ultraviolet light from leaking to the outside from the first surface (54) side.

[0074] The ultraviolet ray irradiation unit (50) is provided with only one reflecting portion that reflects the ultraviolet ray irradiated by the irradiating portion (60). Therefore, attenuation of the ultraviolet ray due to reflection can be suppressed compared to a configuration in which ultraviolet ray is irradiated by multiple reflecting portions.

[0075] The first length of the sterilization space (S) in the first direction is greater than the second length of the sterilization space (S) in the second direction. This increases the distance that the ultraviolet light irradiated by the irradiating section (60) travels to reach the first reflecting section (71). This ultraviolet light is not yet attenuated by reflection at the first reflecting section (71). This makes it possible to irradiate the sterilization space (S) with ultraviolet light of high illuminance over the entire longitudinal direction. As a result, the sterilization effect of the air in the sterilization space (S) can be improved.

[0076] A third length in a third direction orthogonal to the first and second directions in the sterilization space (S) is smaller than the first and second lengths. The casing (51) is configured so that air flows through the sterilization space (S) from one side to the other side in the third direction. Specifically, the air flows through the sterilization space (S) along the third direction. This shortens the length of the flow path through which the air passes through the sterilization space (S) and increases the cross-sectional area of ​​the flow path, thereby reducing the flow path resistance of the air. As a result, an increase in the power of the indoor fan (33) due to pressure loss can be suppressed.

[0077] If the distance in the second direction from the first surface (54), which is the inner surface at one end side in the second direction of the sterilization space (S), to the origin P1 of the ultraviolet light of the irradiation section (60) is L, and the distance in the second direction from the origin P1 to the origin P2 of the reflected light of the first reflecting section (71) is b, then the relationship b≦L / 2 is satisfied. By shortening the distance b in this manner, it is possible to prevent the ultraviolet light reflected by the first reflecting section (71) from hitting the first surface (54). As a result, it is possible to expand the area of ​​the reflected light in the sterilization space (S). In addition, it is possible to prevent the reflected light from leaking to the outside from the first surface (54).

[0078] If the distance in the second direction from the first surface (54), which is the inner surface at one end side in the second direction in the sterilization space (S), to the origin P1 of the ultraviolet light of the irradiation unit (60) is defined as L, and the distance in the first direction from the origin P1 to the origin P2 of the reflected light of the first reflection unit (71) is defined as a, then the first angle θ1<2tan -1 The relationship (L / 2a) is satisfied. By making the first angle θ1 small in this way, it is possible to prevent the ultraviolet light reflected by the first reflecting portion (71) from hitting the first surface (54). As a result, it is possible to expand the area of ​​the reflected light in the sterilization space (S). In addition, it is possible to prevent the reflected light from leaking to the outside from the first surface (54).

[0079] The reflectance of ultraviolet light on the first reflecting portion (71) is equal to or greater than 50%, which makes it possible to prevent the illuminance of ultraviolet light from being attenuated due to reflection of the ultraviolet light on the first reflecting portion (71).

[0080] The ultraviolet ray irradiation unit (50) is provided in the air conditioner (10). Therefore, the target air of the air conditioner (10) can be sterilized by the ultraviolet ray irradiation unit (50).

[0081] The air conditioner (10) includes an indoor casing (30a) that is an air conditioning casing. The casing (51) of the ultraviolet ray irradiation unit (50) is disposed inside the indoor casing (30a). As a result, the sterilization space (S) is located inside both the casing (51) of the ultraviolet ray irradiation unit (50) and the air conditioning casing (30a). This makes it possible to prevent ultraviolet rays from the sterilization space (S) from leaking outside the air conditioning casing (30a).

[0082] The casing (51) of the ultraviolet ray irradiation unit (50) extends along the longitudinal direction of the air conditioning casing (30a). This ensures a sufficient space for disposing the ultraviolet ray irradiation unit (50) inside the air conditioning casing (30a). This increases the longitudinal length of the sterilizing space (S), thereby improving the efficiency of sterilizing the air.

[0083] The ultraviolet irradiating unit (50) is disposed upstream of the indoor heat exchanger (32). Therefore, when the air conditioner (10) is in operation, the ultraviolet irradiating unit (50) is less susceptible to the effect of heat from the indoor heat exchanger (32).

[0084] (7) Variations The above-described embodiment may have the following modified configurations. The following describes the differences from the above-described embodiment.

[0085] (7-1) Variation 1 The irradiation section (60) of the above-described embodiment may be configured as follows.

[0086] (7-1-1) Variation 1A In the irradiation section (60) of modification 1A shown in Fig. 7, the LED (61) faces the first reflecting section (71). The circuit board (63) is located closer to the third surface (56) than the LED (61). The inner curved surface of the reflector (62) faces the first reflecting section (71). The ultraviolet light irradiated from the LED (61) to the first reflecting section (71) is reflected by the inner surface of the reflector (62) and then sent along the first optical axis (A1) to the first reflecting section (71).

[0087] (7-1-2) Variation 1B The irradiation unit (60) of the modification 1B shown in FIG. 8 includes a condenser lens (65) which is a light distribution control unit (D). The condenser lens (65) condenses the ultraviolet light radiated from the LED (61) and distributes the light toward the first reflecting unit (71). The ultraviolet light condensed by the condenser lens (65) is sent to the first reflecting unit (71) along the first optical axis (A1). The condenser lens (65) may be a Fresnel lens having a saw-like cross section passing through the axis. The condenser lens (65) may be a total internal reflection (TIR) ​​lens. The TIR lens has a surface that condenses the ultraviolet light radiated from the LED (61) and a surface that totally reflects the ultraviolet light.

[0088] (7-1-3) Variation 1C The light distribution control section (D) may have the above-mentioned reflector (62) and condenser lens (65), and may be configured to distribute the ultraviolet light toward the first reflecting section (71) by using these.

[0089] (7-2) Variation 2 The ultraviolet ray irradiation unit (50) of the second modification shown in Fig. 9 includes a second reflecting part (80). The second reflecting part (80) is disposed at one end of the sterilization space (S) in the first direction, and reflects the ultraviolet ray irradiated from the first reflecting part (71) toward the other end.

[0090] The second reflecting portion (80) is disposed between a middle position in the sterilization space (S) in the first direction and the third surface (56). The second reflecting portion (80) is disposed near the third surface (56). The second reflecting portion (80) is disposed between a middle position in the sterilization space (S) in the second direction and the first surface (54). The second reflecting portion (80) is preferably fixed to the third surface (56).

[0091] The third optical axis (A3) of the reflected light of the second reflecting portion (80) is shifted by a second angle θ2 toward one end in the second direction relative to the second optical axis (A2) of the first reflecting portion (71). Therefore, in the sterilizing space (S), the range of the ultraviolet light irradiated from the irradiating portion (60) expands toward one end in the second direction. As a result, the irradiation range of the ultraviolet light can be expanded in the second direction, and sterilization efficiency can be improved.

[0092] The second angle θ2 is set so that the ultraviolet light reflected by the second reflecting portion (80) returns to the fourth surface (57). In other words, the third optical axis (A3) of the second reflecting portion (80) is directed toward the fourth surface (57). As a result, the area of ​​the reflected light in the sterilizing space (S) can be expanded. In addition, the reflected light can be prevented from leaking to the outside from the first surface (54).

[0093] The third optical axis (A3) of the reflected light from the second reflecting portion (80) is directed toward the corner between the first surface (54) and the fourth surface (57), thereby improving the sterilization efficiency in the area around this corner.

[0094] The second angle θ2 may be any angle greater than 0°. The second angle θ2 is preferably equal to or greater than 1°, and may be, for example, 2° or 3°. That is, the second angle θ2 may be equal to or less than 3°. The second angle θ2 may be the same as the first angle θ1, or may be different.

[0095] (7-3) Variation 3 In a third modification shown in Fig. 10, the irradiation section (60) is provided at a middle position in the second direction. The first optical axis (A1) of the irradiation section (60) is aligned along the first direction.

[0096] The first reflecting portion (71) has a bent portion (73) at the middle in the second direction. The bent portion (73) is located at the apex of the reflecting surface (72) protruding toward the third surface (56). The bent portion (73) is located at a position overlapping with the irradiating portion (60) in the first direction. The reflecting surface (72) of the first reflecting portion (71) reflects ultraviolet light in two directions with the bent portion (73) as a boundary. Specifically, the second optical axis (A2) of the reflected light of the first reflecting portion (71) includes an optical axis 2A (A2a) and an optical axis 2B (A2b). The optical axis 2A (A2a) is shifted from the first optical axis (A1) toward the first surface (54) by an angle θ1a. The optical axis 2B (A2b) is shifted from the first optical axis (A1) toward the second surface (55) by an angle θ1b.

[0097] Also in this configuration, it is possible to prevent the light reflected by the first reflecting portion (71) from impinging on the irradiating portion (60), and thus it is possible to prevent deterioration of the irradiating portion (60).

[0098] The optical axis 2A (A2a) and the optical axis 2B (A2b) extend to both ends in the second direction with the irradiation part (60) in between, so that the irradiation area of ​​the ultraviolet light in the sterilizing space (S) can be expanded.

[0099] The optical axis 2A (A2a) is directed toward the corner between the first surface (54) and the third surface (56). This improves the sterilization efficiency in the area around this corner. The optical axis 2B (A2b) is directed toward the angle between the third surface (56) and the second surface (55). This improves the sterilization efficiency in the area around this corner.

[0100] The angles θ1a and θ1b may be any angle greater than 0°. The angles θ1a and θ1b are preferably 1° or greater, and may be, for example, 2° or 3°. In other words, the angles θ1a and θ1b may be 3° or less.

[0101] (7-4) Variation 4 The casing (51) of the fourth modification shown in FIG. 11 is configured so that air flows through the sterilization space (S) from one side to the other side in the third direction, as in the above embodiment. On the other hand, in the fourth modification, the direction of the air flowing through the sterilization space (S) is inclined with respect to the third direction. The angle between the direction of the air flow and the third direction may be 45° or less. Even in this configuration, the length of the flow path through which the air passes through the sterilization space (S) is shortened and the cross-sectional area of ​​the flow path is increased, thereby reducing the flow path resistance of the air. As a result, an increase in the power of the indoor fan (33) due to pressure loss can be suppressed.

[0102] (7-5) Variation 5 In a fifth modification shown in FIG. 12, an ultraviolet irradiation unit (50) is applied to an air duct (90). The air duct (90) includes a duct body (91) and the ultraviolet irradiation unit (50). A duct flow path (92) through which air flows is formed inside the duct body (91). The duct body (91) is formed in a tubular shape extending in the direction in which the air flows. The duct body (91) may be in the shape of a cylinder or a rectangular tube. The duct body (91) may be made of a hard material such as resin or iron, or may be made of a flexible material such as a hose.

[0103] A casing (51) of the ultraviolet irradiation unit (50) is disposed in the duct flow path (92) of the duct body (91). The casing (51) extends in the direction of air flow in the duct flow path (92). Specifically, a first direction, which is the longitudinal direction of the casing (51), corresponds to the direction of air flow in the duct flow path (92) or the cylindrical axis direction. A second direction, which is the transverse direction of the casing (51), corresponds to a direction perpendicular to the air flow in the duct flow path (92). The casing (51) of this example is formed in a cylindrical shape that fits along the inner circumferential surface of the duct body (91). This configuration can maximize the volume of the sterilization space (S) of the casing (51).

[0104] The inlet (52) is formed in the third surface (56) of the casing (51). The inlet (52) opens toward the upstream side of the duct flow path (92). The inlet (52) is preferably located so as not to overlap with the irradiation section (60) in the first direction. The number of the inlet (52) may be one or more.

[0105] The outlet (53) is formed in the fourth surface (57) of the casing (51). The outlet (53) opens toward the downstream side of the duct flow path (92). The outlet (53) is preferably located so as not to overlap with the irradiation section (60) in the first direction. The number of the outlet (53) may be one or more.

[0106] The casing (51) is configured so that air flows through the sterilization space (S) from one side to the other side in the first direction. Specifically, the casing (51) is configured so that air flows through the sterilization space (S) along the first direction. The air in the sterilization space (S) flows in the same direction as the air in the duct flow path (92). Therefore, the air in the duct flow path (92) passes through the casing (51) without changing its direction. This reduces flow path resistance in the casing (51).

[0107] Also in this example, the second optical axis (A2) of the reflected light from the first reflecting portion (71) is shifted by the first angle θ1 with respect to the first optical axis (A1) of the ultraviolet light from the irradiating portion (60). This makes it possible to prevent the ultraviolet light from reaching the irradiating portion (60), thereby suppressing deterioration of the irradiating portion (60).

[0108] As in the fourth modification, the air flowing through the casing (51) may be inclined with respect to the first direction. The angle between the direction of the air flow and the first direction may be no greater than 45°.

[0109] (7-6) Variation 6 13 is different from the above embodiment in the configuration of the first reflecting section (71). In the sterilization space (S) of the sixth modification, an irradiation section (60) is provided on the third surface (56) side, and a first reflecting section (71) is provided on the fourth surface (57) side.

[0110] The irradiation unit (60) is disposed so as to be shifted in the second direction with respect to the optical axis X1. Specifically, the irradiation unit (60) in this example is disposed closer to one end side (first surface (54)) in the second direction. The irradiation unit (60) irradiates ultraviolet light in the first direction. The irradiation unit (60) may irradiate ultraviolet light so as to be shifted inward in the second direction by a predetermined angle with respect to the first direction.

[0111] The first reflecting portion (71) spans both ends of the sterilization space (S) in the second direction. The first reflecting portion (71) has a first reflecting surface (72). When viewed in a cross section in a third direction perpendicular to the first and second directions, the first reflecting surface (72) is formed in an arc shape recessed toward the other end side in the first direction. That is, when viewed in a cross section in the third direction, the first reflecting surface (72) has a curved shape recessed toward the other end side in the first direction. When viewed in a cross section in the second direction, the first reflecting surface (72) preferably has a curved shape recessed toward the other end side in the first direction. In other words, the first reflecting surface (72) preferably has a spherical shape or a parabolic shape. This makes it possible to prevent ultraviolet light reflected by the first reflecting surface (72) from leaking from the sterilization space (S) to the outside in the third direction.

[0112] The first reflecting surface (72) has a first radius of curvature R1. In Fig. 13, C1 is the midpoint of the arcuate surface of the first reflecting surface (72), and X1 is the optical axis of the first reflecting surface (72) itself.

[0113] As in the above-described embodiment, the second optical axis (A2) of the ultraviolet light reflected by the first reflecting portion (71) is shifted by a first angle θ1 toward one end in the second direction with respect to the first optical axis (A1) of the ultraviolet light from the irradiating portion (60). This makes it possible to prevent the ultraviolet light reflected from the first reflecting portion (71) from hitting the irradiating portion (60). It is preferable that the second optical axis (A2) is shifted by a predetermined angle inward in the second direction with respect to the first optical axis (A1).

[0114] The distance from C1 to the third surface (56) is defined as L1. In this case, it is preferable that the first reflecting portion (71) is configured to satisfy the relationship R1≧L1. If R1 were smaller than L1, the focal point f1 of the first reflecting surface (72) would be closer to the first reflecting portion (71) than the midpoint M on X1, for example, as shown by the focal point f1a in FIG. 13. As a result, the second optical axis (A2) of the ultraviolet light reflected by the first reflecting portion (71) would deviate from the sterilization space (S) in the second direction, as shown by the optical axis (A2a) in FIG. 13. In contrast, by satisfying the relationship R1≧L1, it is possible to prevent the ultraviolet light reflected from the first reflecting portion (71) from deviating from the sterilization space (S) in the second direction.

[0115] The first reflecting portion (71) is preferably configured to satisfy the relationship R1≦2×L1. If R1 is greater than 2×L1, the focal point f1 of the first reflecting surface (72) will be located to the left of the third surface (56) (one end side in the first direction), for example, as shown by the focal point f1b in FIG. 13. As a result, the ultraviolet light (second optical axis (A2)) reflected by the first reflecting portion (71) approaches the irradiation portion (60), as shown by the optical axis (A2b) in FIG. 13. In contrast, by satisfying R1≦2×L, the ultraviolet light reflected by the first reflecting portion (71) can be prevented from approaching the irradiation portion (60), and thus deterioration of the irradiation portion (60) can be prevented.

[0116] (7-7) Variation 7 The seventh modification further includes a second reflecting portion (80) in the configuration of the sixth modification. As shown in FIG. 14, the second reflecting portion (80) is provided on the third surface (56) side. The second reflecting portion (80) spans both ends of the sterilization space (S) in the second direction. The second reflecting portion (80) has a second reflecting surface (82). When viewed in a cross section in the third direction, the second reflecting surface (82) is formed in an arc shape recessed toward one end side in the first direction. In other words, when viewed in a cross section in the third direction, the second reflecting surface (82) has a curved shape recessed toward one end side in the first direction. When viewed in a cross section in the second direction, the second reflecting surface (82) preferably has a curved shape recessed toward one end side in the first direction. In other words, the second reflecting surface (82) preferably has a spherical shape or a parabolic shape. This makes it possible to prevent the ultraviolet light reflected by the second reflecting surface (82) from leaking from the sterilizing space (S) to the outside in the third direction.

[0117] The second reflecting surface (82) faces the first reflecting surface (72) in the first direction. The second reflecting surface (82) has a second radius of curvature R2.

[0118] In FIG. 14, C1 is the midpoint of the arcuate surface of the first reflecting surface (72), C2 is the midpoint of the arcuate surface of the second reflecting surface (82), and X is the optical axis of the first reflecting surface (72) and the second reflecting surface (72) themselves.

[0119] The distance from C1 to C2 is defined as L2. In this case, the first reflecting portion (71) is preferably configured to satisfy the relationship R1≧L2, and more preferably to satisfy the relationship R1≦2×L2. The reason for this is the same as in the sixth modification example.

[0120] The second reflecting portion (80) preferably satisfies the relationship of R2 ≥ L2. If R2 becomes smaller than L2, similar to the first reflecting portion (71) described above, the focus of the second reflecting surface (82) approaches the second reflecting portion (80), and the optical axis of the second reflecting portion (80) deviates from one end side in the second direction of the sterilization space (S). On the other hand, by setting R2 ≥ L2, it is possible to suppress the ultraviolet rays reflected from the second reflecting portion (80) from deviating in the second direction in the sterilization space (S).

[0121] The first reflecting portion (71) and the second reflecting portion (80) are configured such that the ultraviolet rays reflected by them are contained within the sterilization space (S). Here, in the first reflecting portion (71) and the second reflecting portion (80), it is preferable that the total number of their reflections is 3 or more, and more preferably 7 or more.

[0122] When R1 and R2 are the same (R = R1 = R2), the first reflecting portion (71) and the second reflecting portion (80) preferably satisfy the relationship of L2 < R, and more preferably satisfy the relationship of R < 2 × L2. If L2 = R, as shown in FIG. 14, the optical axis of the ultraviolet rays reflected for the second time in the first reflecting portion (71) (the optical axis (A4) in FIG. 14) easily reaches the irradiation portion (60). Also, if R = 2 × L2, as shown in FIG. 15, the optical axis of the ultraviolet rays reflected for the third time in the first reflecting portion (71) (the optical axis (A8) in FIG. 14) easily reaches the irradiation portion (60). On the other hand, by satisfying the relationship of L2 < R < 2 × L2, it is possible to suppress the ultraviolet rays reflected from the first reflecting portion (71) from reaching the irradiation portion (60).

[0123] When R1 and R2 are different, it is possible to avoid the ultraviolet rays reflected from the first reflecting portion (71) from reaching the irradiation portion (60) as shown in FIGS. 14 and 15. Therefore, the first reflecting portion (71) and the second reflecting portion (80) may be configured such that the respective curvature radii R1 and R2 are different from each other.

[0124] (8) Other Embodiments The flow path forming member of the ultraviolet irradiation unit (50) may be the air conditioning casing (30a) of the air conditioner (10), or may be formed of a part of the air conditioning casing (30a) and other components of the air conditioner (10). For example, the first surface (54) and the second surface (55) of the flow path forming member shown in Fig. 5 may be formed of the above-mentioned components.

[0125] The flow path forming member of the ultraviolet irradiation unit (50) may be only a part of the air conditioning casing (30a) of the air conditioner (10). The flow path forming member of the ultraviolet irradiation unit (50) does not necessarily have to be frame-shaped, and it is sufficient if it has a surface that defines the sterilizing space (S) through which air passes.

[0126] The flow path forming member may be formed by part of the duct body (91) of the air duct (90). In this case, a sterilizing space (S) is formed inside the air conditioning casing (30a) or inside the duct body (91).

[0127] A first length of the sterilization space (S) in a first direction may be shorter than a second length of the sterilization space (S) in a second direction.

[0128] The air conditioner (10) is a pair type having one indoor unit (30) and one outdoor unit (20). However, the air conditioner (10) may be an indoor multi-type having two or more indoor units (30) or an outdoor multi-type having two or more outdoor units (20).

[0129] The air conditioner (10) may be a ventilation device that ventilates air, an air purification device that purifies air, or a humidity control device that humidifies or dehumidifies air. In other words, "air conditioning" as used here means not only adjusting the temperature of air, but also ventilation of air, purification of air, and adjustment of air humidity.

[0130] Although the embodiment and modifications have been described above, it will be understood that various modifications in form and details are possible without departing from the spirit and scope of the claims. Elements of the above embodiment, modifications, and other embodiments may be appropriately combined or substituted.

[0131] The descriptions "first," "second," "third," etc. mentioned above are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words. [Industrial Applicability]

[0132] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for ultraviolet irradiation units, air conditioners, and air ducts. [Explanation of symbols]

[0133] 10. Air conditioning equipment 30a Indoor casing (air conditioning casing) 43 Air passage 50 UV irradiation units 51 Casing (flow path forming member) 54 Page 1 60 Irradiation unit 71 1st reflection section 80 2nd reflection section 90 Air Duct S Sterilization space

Claims

1. a flow path forming member (51) in which a sterilization space (S) through which air flows is formed; an irradiation section (60) that is disposed at one end side in a first direction of the sterilization space (S) and irradiates ultraviolet light toward the other end side in the first direction; a first reflecting section (71) that is disposed on the other end side of the sterilization space (S) in the first direction and that reflects the ultraviolet light irradiated from the irradiation section (60) so that the ultraviolet light returns to the one end side in the first direction, The optical axis of the reflected light from the first reflecting portion (71) is shifted by a first angle θ1 toward one end in a second direction perpendicular to the first direction with respect to the optical axis of the ultraviolet light from the irradiating portion (60). UV irradiation unit.

2. A first length of the sterilization space (S) in the first direction is greater than a second length of the sterilization space (S) in the second direction. The ultraviolet irradiation unit according to claim 1 .

3. a third length in a third direction perpendicular to the first direction and the second direction in the sterilization space (S) is smaller than the first length and the second length; The flow path forming member (51) is configured so that air flows from one side to the other side in the third direction. The ultraviolet irradiation unit according to claim 2 .

4. The flow path forming member (51) is configured so that air flows through the sterilization space (S) from one side to the other side in the first direction. The ultraviolet irradiation unit according to claim 2 .

5. Let L be the distance in the second direction from a first surface (54), which is an inner surface at one end side of the sterilization space (S) in the second direction, to an origin point P1 of the ultraviolet light of the irradiation unit (60), and b be the distance in the second direction from the origin point P1 to an origin point P2 of the reflected light of the first reflection unit (71), The relationship b≦L / 2 is satisfied. The ultraviolet irradiation unit according to any one of claims 1 to 4.

6. Let L be the distance in the second direction from a first surface (54) that is an inner surface at one end side of the sterilization space (S) in the second direction to an origin point P1 of the ultraviolet light of the irradiation unit (60) and a be the distance in the first direction from the origin point P1 to an origin point P2 of the reflected light of the first reflection unit (71), First angle θ1<2tan -1 The relationship (L / 2a) is satisfied. The ultraviolet irradiation unit according to any one of claims 1 to 4.

7. a second reflecting section (80) that is disposed on one end side of the sterilization space (S) in the first direction and reflects the ultraviolet light irradiated from the first reflecting section (71) toward the other end side in the first direction; The optical axis of the reflected light of the second reflecting portion (80) is shifted by a second angle θ2 toward one end side in the second direction with respect to the optical axis of the first reflecting portion (71). The ultraviolet irradiation unit according to any one of claims 1 to 4.

8. The first angle θ1 is 30 degrees or less. The ultraviolet irradiation unit according to any one of claims 1 to 4.

9. The reflectance of ultraviolet light at the first reflecting portion (71) is 50% or more. The ultraviolet irradiation unit according to any one of claims 1 to 4.

10. An air conditioner comprising an ultraviolet irradiation unit (50) according to any one of claims 1 to 4.

11. an air conditioning casing (30a) in which an air passage (43) is formed; The flow path forming member (51) is disposed in the air passage (43). The air conditioning apparatus according to claim 10.

12. An air duct comprising an ultraviolet irradiation unit (50) according to any one of claims 1 to 4.

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