UV 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 conditioner, and an air duct.

Background Art

[0002] The ultraviolet irradiation unit disclosed in Patent Document 1 includes an ultraviolet light emitting diode that irradiates ultraviolet light, and a reflection unit that reflects the ultraviolet light irradiated from the ultraviolet light emitting diode. As described 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 reflection unit. The reflected ultraviolet light is sent toward the ultraviolet light emitting diode side along the optical axis of the parallel light. The ultraviolet light that reciprocates between the ultraviolet light emitting diode and the reflection unit irradiates the air flowing between them, thereby inactivating bacteria and viruses in the air.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the ultraviolet unit disclosed in Patent Document 1, the ultraviolet light reflected by the reflection unit is reflected in the direction along the optical axis of the ultraviolet light irradiated from the irradiation unit. Therefore, the ultraviolet light reflected by the reflection unit is likely to hit the irradiation unit, and the irradiation unit deteriorates 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 Problems

[0006] The first embodiment relates to an ultraviolet irradiation unit (50). The ultraviolet irradiation unit (50) comprises a flow channel forming member (51) through which a sterilization space (S) through which air flows is formed, an irradiation unit (60) positioned at one end of the sterilization space (S) in a first direction and irradiating ultraviolet light toward the other end in the first direction, and a first reflecting unit (71) positioned at the other end of the sterilization space (S) in the first direction and reflecting the ultraviolet light irradiated from the irradiation unit (60) so as to return the ultraviolet light to the one end in the first direction. With respect to the optical axis of the ultraviolet light from the irradiation unit (60), the optical axis of the reflected light from the first reflecting unit (71) is shifted by a first angle θ1 toward one end in a second direction perpendicular to the first direction.

[0007] In the first embodiment, ultraviolet light irradiated from the irradiation unit (60) is reflected by the first reflecting unit (71) and then returns to the irradiation unit (60). The optical axis of the reflected light from the first reflecting unit (71) is shifted by a first angle in the second direction with respect to the optical axis of the ultraviolet light from the irradiation unit (60), so that this reflected light does not hit the irradiation unit (60). As a result, deterioration of the irradiation unit (60) due to reflected ultraviolet light can be suppressed.

[0008] In the second embodiment, 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.

[0009] In the second embodiment, the sterilization space (S) is elongated in the direction in which the ultraviolet light irradiated from the irradiation unit (60) and the reflected light from the first reflecting unit (71) propagate. Therefore, a distance can be secured before the ultraviolet light irradiated from the irradiation unit (60) is attenuated by being reflected by the first reflecting unit (71), thereby improving the sterilization effect of the air in the sterilization space (S).

[0010] In the third embodiment, in the second embodiment, the third length in the third direction perpendicular to the first and second directions in the sterilization space (S) is smaller than the first and second lengths, and the flow path forming member (51) is configured such that air flows through the sterilization space (S) from one side to the other in the third direction.

[0011] In the third embodiment, the length of the airflow path through the sterilization space (S) is shortened and the cross-sectional area of ​​the airflow path is increased, thereby reducing the airflow resistance.

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

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

[0014] In the fifth embodiment, in any one of the first to fourth embodiments, if L is the distance in the second direction from the first surface (54), which is the inner surface of one end of the sterilization space (S) in the second direction, to the starting point P1 of the ultraviolet light from the irradiation unit (60), and b is the distance in the second direction from the starting point P1 to the starting point P2 of the reflected light from the first reflecting unit (71), then the relationship b ≤ L / 2 is satisfied.

[0015] In the fifth embodiment, it is possible to avoid the reflected light reflected by the first reflecting part (71) hitting the first surface (54).

[0016] The sixth aspect is that, in any one of the first to fifth aspects, if L is the distance in the second direction from the first surface (54), which is the inner surface of one end of the sterilization space (S) in the second direction, to the starting point P1 of the ultraviolet light from the irradiation unit (60), and a is the distance in the first direction from the starting point P1 to the starting point P2 of the reflected light from the first reflecting unit (71), then the first angle θ1 < 2tan -1 The relationship (L / 2a) is satisfied.

[0017] In the sixth embodiment, it is possible to avoid the reflected light reflected by the first reflecting part (71) hitting the first surface (54).

[0018] The seventh aspect is that in any one of the first to fourth aspects, a second reflecting portion (80) is disposed on one end side in the first direction of the sterilization space (S), and reflects the ultraviolet rays irradiated from the first reflecting portion (71) toward the other end side in the first direction. With respect to the optical axis of the first reflecting portion (71), the optical axis of the reflected light of the second reflecting portion (80) is deviated by a second angle θ2 toward one end side in the second direction.

[0019] In the seventh aspect, by further deflecting and reflecting the ultraviolet rays reflected by the first reflecting portion (71) by the second reflecting portion (80) toward one end side in the second direction, the range of the ultraviolet rays can be expanded in the second direction.

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

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

[0022] The ninth aspect is that in any one of the first to eighth aspects, the reflectance of the ultraviolet rays in the first reflecting portion (71) is 50% or more.

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

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

[0025] The eleventh aspect is that in the tenth aspect, an air conditioning casing (30a) in which an air passage (43) is formed is provided, and the flow path forming member (51) is disposed in the air passage (43). Thereby, the sterilization space (S) is located inside both the flow path forming member (51) and the air conditioning casing (30a). Therefore, it is possible to suppress the leakage of the ultraviolet rays in the sterilization space (S) to the outside of the air conditioning casing (30a).

[0026] The twelfth embodiment is an air duct equipped with an ultraviolet irradiation unit (50) according to any one of the first to ninth embodiments. [Brief explanation of the drawing]

[0027] [Figure 1] Figure 1 is a piping diagram of an air conditioning system according to an embodiment. [Figure 2] Figure 2 is a perspective view showing the exterior of the indoor unit. [Figure 3] Figure 3 is a cross-sectional view showing the internal structure of the indoor unit. [Figure 4] Figure 4 is a perspective view showing the configuration of the ultraviolet irradiation unit. [Figure 5] Figure 5 is a plan view showing the internal structure of the ultraviolet irradiation unit. [Figure 6] Figure 6 is a schematic diagram of the irradiation unit. [Figure 7] Figure 7 is a schematic diagram of the irradiation unit according to modified example 1A. [Figure 8] Figure 8 is a schematic diagram of the irradiation unit according to modified example 1B. [Figure 9] Figure 9 is a plan view showing the internal structure of the ultraviolet irradiation unit in Modification 2. [Figure 10] Figure 10 is a plan view showing the internal structure of the ultraviolet irradiation unit according to Modification 3. [Figure 11] Figure 11 is a perspective view showing the configuration of the ultraviolet irradiation unit according to Modification 4. [Figure 12] Figure 12 is a plan view showing the internal structure of the ultraviolet irradiation unit according to Modification 5. [Figure 13] Figure 13 is a plan view showing the internal structure of the ultraviolet irradiation unit according to Modification 6. [Figure 14] Figure 14 is a plan view showing the internal structure of an ultraviolet irradiation unit according to one example of Modification 7. [Figure 15] Figure 15 is a plan view showing the internal structure of an ultraviolet irradiation unit according to another example of Modification 7. [Modes for carrying out the invention]

[0028] The embodiments of this disclosure will be described in detail below with reference to the drawings. However, this disclosure is not limited to the embodiments shown below, and various modifications are possible without departing from the technical idea of ​​this disclosure. Since the drawings are for conceptual illustration of this disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary for ease of understanding.

[0029] (1) Configuration of the air conditioning system The ultraviolet irradiation unit (50) of this disclosure is applied to an air conditioning unit (10). The air conditioning unit (10) harmonizes the air in an indoor space, which is the target space. The air conditioning unit (10) adjusts the temperature of the indoor air.

[0030] (1-1) Overall structure As shown in Figure 1, the air conditioning system (10) includes an outdoor unit (20), an indoor unit (30), a first connecting pipe (12), and a second connecting pipe (13). The air conditioning system (10) is a paired system with 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) to form 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 an oscillating piston type, rotary type, or scroll type. The outdoor heat exchanger (22) is a fin and tube type. The four-way switching valve (24) switches between a first state (shown by the solid line in Figure 1) and a second state (shown by the dashed line in Figure 1). In the first state, the four-way switching valve (24) connects the discharge part of the compressor (21) to the gas end of the outdoor heat exchanger (22), and also connects the suction part of the compressor (21) to the first connecting pipe (12). In the second state, the four-way switching valve (24) connects the discharge part of the compressor (21) to the first connecting pipe (12), and also connects the suction part of the compressor (21) to the gas end of the outdoor heat exchanger (22). The outdoor fan (25) is a propeller fan.

[0033] (1-3) Indoor unit As shown in Figures 2 and 3, the indoor unit (30) is installed in the indoor space (I). The indoor unit (30) is a wall-mounted indoor air conditioner installed on the 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 the air conditioning casing. The indoor casing (30a) is formed as a horizontally elongated hollow structure. The longitudinal direction of the indoor casing (30a) is the left-right direction. The indoor casing (30a) houses the air filter (31), indoor heat exchanger (32), indoor fan (33), drain pan (34), and flap (35). The indoor casing (30a) has an intake port (41) and an outlet port (42). The intake port (41) is formed at the top of the indoor casing (30a). The intake port (41) is an opening for drawing in air from the indoor space (I). The intake port (41) extends in the longitudinal direction of the indoor casing (30a). The outlet port (42) is formed towards the front of the lower part of the indoor casing (30a). The air outlet (42) extends in the longitudinal direction of the indoor casing (30a). Inside the indoor casing (30a), an air passage (43) is formed between the intake port (41) and the air outlet (42).

[0035] The air filter (31) is positioned upstream of the indoor heat exchanger (32) in the air passage (43). The air filter (31) is a mesh-like component formed to follow the intake port (41). The air filter (31) collects dust particles in the air drawn in from the intake port (41).

[0036] The indoor heat exchanger (32) is located 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 inside it 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 rotationally driven by a fan motor (33a). The indoor fan (33) transports air in the air passage (43). When the indoor fan (33) is driven, air from the indoor space (I) is drawn 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 from the outlet (42). The indoor fan (33) is configured to allow adjustment of the airflow rate of the blown air supplied from the outlet (42) to the indoor space (I).

[0038] The drain pan (34) is located below the indoor heat exchanger (32). The drain pan (34) is a tray that receives water generated inside 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 discharged air. The flap (35) adjusts the vertical direction of the discharged air. The flap (35) may also adjust the horizontal direction of the discharged air.

[0040] (2) UV irradiation unit The indoor unit (30) of the air conditioning system (10) is equipped with an ultraviolet irradiation unit (50). The ultraviolet irradiation unit (50) inactivates bacteria and viruses in the air with ultraviolet light. As shown in Figure 3, the ultraviolet irradiation unit (50) is housed inside the indoor casing (30a). The ultraviolet irradiation unit (50) is positioned in the air passage (43). Specifically, the ultraviolet irradiation unit (50) is positioned upstream of the indoor heat exchanger (32) in the air passage (43).

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

[0042] (2-1) Casing A sterilization space (S) is formed inside the casing (51) through which air to be sterilized by ultraviolet light flows. The casing (51) is formed in the shape of a hollow rectangular parallelepiped. The casing (51) extends along the longitudinal direction (left-right direction) of the indoor unit (30). As shown in Figure 4, the longitudinal direction of the casing (51) corresponds to the left-right direction or longitudinal direction of the indoor casing (30a). In this embodiment, the thickness direction of the casing (51) corresponds to the direction of airflow 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 on the first casing surface (51a) at one end of the casing (51) in the thickness direction. The inlet (52) extends over substantially the entire area of ​​the first casing surface (51a). An outlet (53) is formed on the second casing surface (51b) at the other end of the casing (51) in the thickness direction. The outlet (53) extends over substantially the entire area of ​​the second casing surface (51b). Inside the casing (51), a sterilization space (S) is formed between the inlet (52) and the outlet (53). The inlet (52) and the outlet (53) face each other across the sterilization space (S).

[0044] The inlet (52) faces the intake 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 inflow 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 or longitudinal direction of the indoor casing (30a). The thickness direction of the sterilization space (S) corresponds to the direction of airflow within the sterilization space (S). The width direction of the sterilization space (S) corresponds to the direction perpendicular to the longitudinal and thickness directions of the sterilization space (S). In this embodiment, the longitudinal direction of the sterilization space (S) is the first direction, the width direction of the sterilization space (S) is the second direction, and the thickness direction of the sterilization space (S) is the third direction.

[0046] Six inner surfaces are formed on the inside of the casing (51) that face the sterilization space (S). As shown in Figures 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 on one end of the sterilization space (S) in the second direction. The second surface (55) is formed on the other end of the sterilization space (S) in the second direction. The third surface (56) is formed on one end of the sterilization space (S) in the first direction. The fourth surface (57) is formed on the other end of the sterilization space (S) in the first direction.

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

[0048] LED(61) is a light source that emits ultraviolet light. The peak wavelength of the ultraviolet light emitted by LED(61) is 280 nm or less. This improves the air sterilization effect. Preferably, the peak wavelength of the ultraviolet light emitted by LED(61) is 255 nm or more and 275 nm or less. This particularly improves the air sterilization effect. The peak wavelength of the ultraviolet light emitted by LED(61) may be 230 nm or less. This improves the safety of exposure to the human body in the event that ultraviolet light leaks outside the indoor casing (30a).

[0049] The reflector (62) is a curved reflector that reflects 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), thereby distributing the ultraviolet light emitted from the irradiation unit (60) so that it is directed toward the first optical axis (A1).

[0050] The circuit board (63) includes a control board for controlling the LED (61). Specifically, the circuit board (63) includes a control device for switching the LED (61) ON / OFF and adjusting the output of the LED (61). The control device of the circuit board (63) may be provided in an air conditioning controller for controlling the air conditioning system (10).

[0051] The LED (61) and the circuit board (63) may be provided with heat dissipation members to suppress the temperature rise of the LED (61).

[0052] (2-3) 1st reflection section The first reflecting part (71) reflects ultraviolet light irradiated from the irradiation part (60). More precisely, the first reflecting part (71) reflects ultraviolet light distributed by the light distribution control unit (D). The first reflecting part (71) is a reflective member having a reflective surface (72) facing the irradiation part (60). It is preferable that the reflectance of the first reflecting part (71) to ultraviolet light is 50% or more. Here, the reflectance R is expressed by the following equation (1).

[0053] R[%]=(E2 / E1)×100···(1) formula Here, E1 is the amount of ultraviolet light [mW] entering the reflector, and E2 is the amount of ultraviolet light [mW] reflected by the reflector.

[0054] (3) Operation of the air conditioning system The air conditioning system (10) performs both cooling and heating operations.

[0055] (3-1) Cooling operation Cooling operation is the operation of cooling the air in the indoor space (I) to bring it closer to the set temperature (target temperature). In cooling operation, the four-way switching valve (24) is in the first state. The refrigerant compressed by the compressor (21) releases heat in the outdoor heat exchanger (22) and is then depressurized by the expansion valve (23). The depressurized 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 drawn into the compressor (21).

[0056] (3-2) Heating operation Heating operation is the operation of heating the air in the indoor space (I) to bring it closer to the set temperature (target temperature). In heating operation, the four-way switching valve (24) enters the second state. In heating operation, the refrigerant compressed by the compressor (21) releases heat in the indoor heat exchanger (32) and is then depressurized by the expansion valve (23). The air heated by the indoor heat exchanger (32) is supplied to the indoor space (I). The depressurized refrigerant evaporates in the outdoor heat exchanger (22) and is then drawn into the compressor (21).

[0057] (4) Details of the layout of the UV irradiation unit The layout of the irradiation unit (60) and the first reflection unit (71) in the sterilization space (S) will be described in detail with reference to Figures 4 and 5.

[0058] (4-1) Irradiation area The irradiation unit (60) is positioned at one end of the sterilization space (S) in the first direction. The irradiation unit (60) is positioned between the intermediate position in the first direction of the sterilization space (S) and the third surface (56). Specifically, the irradiation unit (60) is positioned near the third surface (56). It is preferable that the irradiation unit (60) is fixed to the third surface (56).

[0059] The irradiation unit (60) is positioned closer to the second surface (55). The irradiation unit (60) is positioned between the intermediate position in the second direction of the sterilization space (S) and the second surface (55). The irradiation unit (60) is positioned near the second surface (55).

[0060] The irradiation unit (60) irradiates ultraviolet light from one end to the other in the first direction of the sterilization space (S). The first optical axis (A1) of the ultraviolet light from the irradiation unit (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 positioned on the other end side in the first direction of the sterilization space (S). The first reflecting portion (71) is positioned between the intermediate position in the first direction of the sterilization space (S) and the fourth surface (57). The first reflecting portion (71) is positioned near the fourth surface (57). The first reflecting portion (71) is positioned at the intermediate position in the second direction of the sterilization space (S). It is preferable that the first reflecting portion (71) is fixed to the fourth surface (57).

[0062] The first reflecting part (71) reflects ultraviolet light from one end to the other end in the first direction of the sterilization space (S). The first reflecting part (71) has a reflective surface (71a) that faces one end in the first direction and reflects ultraviolet light. The second optical axis (A2) of the ultraviolet light reflected by the first reflecting part (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 part (71) returns to one end in the first direction of the sterilization space (S). The ultraviolet light reflected by the first reflecting part (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 reflector (71) is shifted by a first angle θ1 toward one end in the second direction relative to the first optical axis (A1) of the ultraviolet light from the irradiating unit (60). Therefore, it is possible to avoid the ultraviolet light reflected from the first reflector (71) hitting the irradiating unit (60). In this way, the first angle θ1 is set to an angle such that the second optical axis (A2) of the first reflector (71) does not overlap with the irradiating unit (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 part (71) are less likely to hit the irradiating part (60) compared to the case where the first angle θ1 is 0°, thereby suppressing the deterioration of the irradiating part (60). The first angle θ1 is preferably 1° or more, and may be, for example, 2° or 3°.

[0065] Let L be the distance in the second direction from the first surface (54) to the starting point P1 of the ultraviolet light from the irradiation unit (60). Let b be the distance in the second direction from point P1 to the starting point P2 of the reflected light from the first reflecting unit (71). In this case, the ultraviolet irradiation unit (50) satisfies the following relationship (2).

[0066] b≦L / 2···(2) formula If b is greater than L / 2, there is a possibility that the ultraviolet light reflected by the first reflector (71) will reach the first surface (54). In contrast, in this embodiment, since b is L / 2 or less, it is possible to suppress the ultraviolet light reflected by the first reflector (71) from reaching the first surface (54), and to allow this ultraviolet light to reach the third surface (56). As a result, in the sterilization space (S), the ultraviolet light reflected by the first reflector (71) is irradiated across both ends in the first direction, so the space of the sterilization space (S) can be used effectively.

[0067] Furthermore, let a be the distance in the first direction from the starting point P1 of the ultraviolet light from the irradiation unit (60) to the starting point P2 of the reflected light from the first reflecting unit (71). In this case, the ultraviolet irradiation unit (50) satisfies the following relationship (3).

[0068] 1st angle θ1<2tan -1 (L / 2a)...Equation (3) The first angle θ1 is 2tan -1 If the value is greater than (L / 2a), there is a possibility that ultraviolet light reflected by the first reflector (71) will reach the first surface (54). In contrast, in this embodiment, if the first angle θ1 is 2tan -1 Since it is smaller than (L / 2a), the ultraviolet light reflected by the first reflector (71) can be prevented from reaching the first surface (54), and this 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 reflector (71) is irradiated across both ends in the first direction, so the space of the sterilization space (S) can be used effectively.

[0069] It is preferable that the first angle θ1 is 30° or less. This reliably prevents ultraviolet rays reflected by the first reflecting portion (71) from reaching the first surface (54). The first angle θ1 may also be 3° or less.

[0070] (5) Operation of the UV irradiation unit The ultraviolet irradiation unit (50) operates when the air conditioning system (10) is in operation. The control device on the circuit board (63) turns on the LED (61) during cooling or heating operation. When the indoor fan (33) is operated during cooling or heating operation, a portion of the air drawn from the indoor space (I) into the intake port (41) is drawn into the casing (51) of the ultraviolet irradiation unit (50). Specifically, the air in the air passage (43) flows into the sterilization space (S) from 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 is directed toward the fourth surface (57) as parallel light along the first optical axis (A1). The ultraviolet light reflected by the first reflector (71) is directed toward the third surface (56) as parallel light along the second optical axis (A2), which forms a first angle θ1 with the first optical axis (A1). In this way, in the sterilization space (S), the ultraviolet light along the first optical axis (A1) emitted from the irradiation unit (60) and the ultraviolet light along the second optical axis (A2) reflected by the first reflector (71) irradiate the third surface (56) and the fourth surface (57) of the sterilization space (S). The ultraviolet light along the first optical axis (A1) and the second optical axis (A2) propagates in a direction along the longitudinal direction of the sterilization space (S). In addition, the first optical axis (A1) and the second optical axis (A2) are angled differently from the second surface (55) side toward the first surface (54) side. This allows for an expansion of the ultraviolet irradiation area in the sterilization space (S).

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

[0073] (6) Effects of the Embodiment With respect to the first optical axis (A1) of ultraviolet light from the irradiating section (60), the second optical axis (A2) of the reflected light from the first reflecting section (71) is shifted by a first angle θ1 toward one end of the second direction perpendicular to the first direction. Therefore, the reflected light reflected by the first reflecting section (71) can be prevented from hitting the irradiating section (60). As a result, the irradiating section (60) can be prevented from being degraded by ultraviolet light. In addition, since the ultraviolet light reflected by the first reflecting section (71) returns to one end of the first direction, leakage of ultraviolet light from the first surface (54) to the outside can be suppressed.

[0074] The ultraviolet irradiation unit (50) has only one reflecting part that reflects the ultraviolet light emitted by the irradiation part (60). Therefore, compared to a configuration in which ultraviolet light is irradiated by multiple reflecting parts, the attenuation of ultraviolet light due to reflection can be suppressed.

[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. Therefore, the distance over which the ultraviolet light emitted by the irradiation unit (60) reaches the first reflecting unit (71) is increased. This ultraviolet light is the ultraviolet light before it is attenuated by reflection at the first reflecting unit (71). As a result, high-intensity ultraviolet light can be irradiated over the entire longitudinal direction of the sterilization space (S). Consequently, the sterilization effect of the air in the sterilization space (S) can be improved.

[0076] In the sterilization space (S), the third length in the third direction, which is perpendicular to the first and second directions, 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 in the third direction to the other. Specifically, air flows through the sterilization space (S) along the third direction. As a result, the length of the airflow path through the sterilization space (S) is shortened and the cross-sectional area of ​​the airflow path is increased, thereby reducing the airflow resistance. Consequently, it is possible to suppress the increase in power of the indoor fan (33) due to pressure loss.

[0077] If L is the distance in the second direction from the first surface (54), which is the inner surface of one end of the second direction in the sterilization space (S), to the starting point P1 of the ultraviolet light from the irradiation unit (60), and b is the distance in the second direction from the starting point P1 to the starting point P2 of the reflected light from the first reflecting unit (71), then the relationship b ≤ L / 2 is satisfied. By shortening the distance b in this way, it is possible to prevent ultraviolet light reflected by the first reflecting unit (71) from hitting the first surface (54). As a result, the area of ​​reflected light in the sterilization space (S) can be expanded. In addition, it is possible to suppress the leakage of reflected light from the first surface (54) side to the outside.

[0078] Let L be the distance in the second direction from the first surface (54), which is the inner surface of one end of the second direction in the sterilization space (S), to the starting point P1 of the ultraviolet light from the irradiation unit (60), and let a be the distance in the first direction from the starting point P1 to the starting point P2 of the reflected light from the first reflecting unit (71). 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 avoid the ultraviolet light reflected by the first reflector (71) hitting the first surface (54). As a result, the area of ​​reflected light in the sterilization space (S) can be expanded. In addition, it is possible to suppress the leakage of reflected light from the first surface (54) to the outside.

[0079] The ultraviolet reflectance at the first reflecting section (71) is 50% or more. Therefore, the reflection of ultraviolet light at the first reflecting section (71) can suppress the attenuation of ultraviolet illuminance.

[0080] The ultraviolet irradiation unit (50) is installed in the air conditioning system (10). Therefore, the target air in the air conditioning system (10) can be sterilized by the ultraviolet irradiation unit (50).

[0081] The air conditioning system (10) includes an indoor casing (30a), which is an air conditioning casing. The casing (51) of the ultraviolet irradiation unit (50) is located inside the indoor casing (30a). As a result, the sterilization space (S) is located inside both the casing (51) of the ultraviolet irradiation unit (50) and the air conditioning casing (30a). Therefore, it is possible to suppress the leakage of ultraviolet light from the sterilization space (S) to the outside of the air conditioning casing (30a).

[0082] The casing (51) of the ultraviolet irradiation unit (50) extends along the longitudinal direction of the air conditioning casing (30a). Therefore, sufficient space can be secured inside the air conditioning casing (30a) for arranging the ultraviolet irradiation unit (50). The longitudinal length of the sterilization space (S) can be increased, and the efficiency of air sterilization can be improved.

[0083] The ultraviolet irradiation unit (50) is positioned upstream of the indoor heat exchanger (32). Therefore, when the air conditioning system (10) is in operation, the ultraviolet irradiation unit (50) is less affected by the heat of the indoor heat exchanger (32).

[0084] (7) Variant In the embodiment described above, the following modified configuration may also be used. The differences from the embodiment described above will be explained below.

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

[0086] (7-1-1) Variation 1A In the modified example 1A shown in Figure 7, the illumination section (60) has the LED (61) facing the first reflector (71). The circuit board (63) is located on the third surface (56) side of the LED (61). The curved surface inside the reflector (62) faces the first reflector (71). Ultraviolet light irradiated from the LED (61) towards the first reflector (71) is reflected off the inner surface of the reflector (62) and then sent to the first reflector (71) side along the first optical axis (A1).

[0087] (7-1-2) Variation 1B The irradiation unit (60) of the modified example 1B shown in Figure 8 includes a focusing lens (65), which is a light distribution control unit (D). The focusing lens (65) focuses the ultraviolet light emitted from the LED (61) and distributes it to the first reflecting unit (71). The ultraviolet light focused by the focusing lens (65) is sent to the first reflecting unit (71) along the first optical axis (A1). The focusing lens (65) may be a Fresnel lens with a sawtooth cross-sectional shape passing through its axis. The focusing lens (65) may also be a TIR (Total Internal Reflection) lens. A TIR lens has a surface that focuses the ultraviolet light emitted from the LED (61) as well as a surface that totally reflects the ultraviolet light.

[0088] (7-1-3) Modification 1C The light distribution control unit (D) may have the reflector (62) and the focusing lens (65) described above, and may be configured to distribute ultraviolet light toward the first reflector (71).

[0089] (7-2) Modification 2 The modified ultraviolet irradiation unit (50) shown in Figure 9, Part 2, includes a second reflecting section (80). The second reflecting section (80) is positioned at one end 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.

[0090] The second reflective portion (80) is positioned between the intermediate position in the first direction of the sterilization space (S) and the third surface (56). The second reflective portion (80) is positioned near the third surface (56). The second reflective portion (80) is positioned between the intermediate position in the second direction of the sterilization space (S) and the first surface (54). It is preferable that the second reflective portion (80) is fixed to the third surface (56).

[0091] With respect to the second optical axis (A2) of the first reflecting part (71), the third optical axis (A3) of the reflected light from the second reflecting part (80) is shifted by a second angle θ2 toward one end in the second direction. As a result, in the sterilization space (S), the range of ultraviolet light irradiated from the irradiation part (60) expands toward one end in the second direction. Consequently, the irradiation range of ultraviolet light can be expanded in the second direction, improving sterilization efficiency.

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

[0093] The third optical axis (A3) of the reflected light from the second reflecting section (80) is directed towards the corner between the first surface (54) and the fourth surface (57). Therefore, sterilization efficiency can be improved in the area surrounding this corner.

[0094] The second angle θ2 only needs to be greater than 0°. Preferably, the second angle θ2 is 1° or more, and may be, for example, 2° or 3°. In other words, the second angle θ2 may be 3° or less. The second angle θ2 may be the same as the first angle θ1, or it may be different.

[0095] (7-3) Modified example 3 In the modified example 3 shown in Figure 10, the irradiation unit (60) is positioned at an intermediate location in the second direction. The first optical axis (A1) of the irradiation unit (60) is aligned with the first direction.

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

[0097] In this configuration as well, the reflected light from the first reflecting section (71) can be prevented from hitting the irradiating section (60), thereby suppressing the deterioration of the irradiating section (60).

[0098] Since the optical axis 2A (A2a) and optical axis 2B (A2b) extend to both ends in the second direction, flanking the irradiation unit (60), the ultraviolet irradiation area in the sterilization space (S) can be expanded.

[0099] Optical axis 2A (A2a) is directed towards the corner between the first surface (54) and the third surface (56). Therefore, sterilization efficiency can be improved in the area surrounding this corner. Optical axis 2B (A2b) is directed towards the angle between the third surface (56) and the second surface (55). Therefore, sterilization efficiency can be improved in the area surrounding this corner.

[0100] Angles θ1a and θ1b only need to be greater than 0°. Preferably, angles θ1a and θ1b are 1° or greater, for example, 2° or 3°. In other words, angles θ1a and θ1b may be 3° or less.

[0101] (7-4) Modification 4 The casing (51) of Modification 4 shown in Figure 11 is configured, similar to the embodiment described above, so that air flows through the sterilization space (S) from one side to the other in the third direction. However, in Modification 4, 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 airflow and the third direction should be 45° or less. In this configuration as well, the length of the airflow path through the sterilization space (S) is shortened and the cross-sectional area of ​​the airflow path is increased, thereby reducing the airflow resistance. As a result, it is possible to suppress the increase in power of the indoor fan (33) due to pressure loss.

[0102] (7-5) Variation 5 In the modified example 5 shown in Figure 12, the ultraviolet irradiation unit (50) is applied to the air duct (90). The air duct (90) comprises a duct body (91) and an ultraviolet irradiation unit (50). A duct channel (92) through which air flows is formed inside the duct body (91). The duct body (91) is formed in a cylindrical shape that extends along the direction of airflow. The duct body (91) may be cylindrical or rectangular. The duct body (91) may be made of a hard material such as resin or iron, or it may be made of a flexible material such as a hose.

[0103] The casing (51) of the ultraviolet irradiation unit (50) is positioned in the duct passage (92) of the duct body (91). The casing (51) extends in the direction of the airflow in the duct passage (92). Specifically, the first direction, which is the longitudinal direction of the casing (51), corresponds to the direction of the airflow in the duct passage (92), or the axial direction of the cylinder. The second direction, which is the short direction of the casing (51), corresponds to the direction perpendicular to the airflow in the duct passage (92). In this example, the casing (51) is formed in a cylindrical shape that follows the inner circumferential surface of the duct body (91). This configuration maximizes the volume of the sterilization space (S) of the casing (51).

[0104] The inlet (52) is formed on the third surface (56) of the casing (51). The inlet (52) opens toward the upstream side of the duct flow path (92). Preferably, the inlet (52) is located in a position that does not overlap with the irradiation section (60) in the first direction. There may be one or more inlets (52).

[0105] The outlet (53) is formed on the fourth surface (57) of the casing (51). The outlet (53) opens toward the downstream side of the duct flow path (92). Preferably, the outlet (53) is located in a position that does not overlap with the irradiation section (60) in the first direction. There may be one or more outlets (53).

[0106] The casing (51) is configured so that air flows through the sterilization space (S) from one side to the other in a 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 passage (92). Therefore, the air in the duct passage (92) passes through the casing (51) without changing direction. Consequently, the flow resistance in the casing (51) can be reduced.

[0107] In this example as well, the second optical axis (A2) of the reflected light from the first reflecting part (71) is shifted by a first angle θ1 with respect to the first optical axis (A1) of the ultraviolet light from the irradiating part (60). Therefore, ultraviolet light can be suppressed from hitting the irradiating part (60), and the deterioration of the irradiating part (60) can be suppressed.

[0108] Similar to the 4th modification, the air flowing through the casing (51) may be inclined with respect to the first direction. The angle between the direction of airflow and the first direction should be 45° or less.

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

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

[0111] The first reflective portion (71) extends across both ends of the sterilization space (S) in the second direction. The first reflective portion (71) has a first reflective surface (72). When viewed in a cross-section in a third direction perpendicular to the first and second directions, the first reflective surface (72) is formed in an arc shape that is concave toward the other end in the first direction. In other words, when viewed in a cross-section in the third direction, the first reflective surface (72) has a curved shape that is concave toward the other end in the first direction. Preferably, when viewed in a cross-section in the second direction, the first reflective surface (72) has a curved shape that is concave toward the other end in the first direction. In other words, it is preferable that the first reflective surface (72) is spherical or parabolic. This prevents ultraviolet light reflected by the first reflective surface (72) from leaking out of 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 Figure 13, C1 is the midpoint of the arc surface of the first reflecting surface (72), and X1 is the optical axis of the first reflecting surface (72) itself.

[0113] Similar to the embodiment described above, the second optical axis (A2) of the ultraviolet light reflected by the first reflecting part (71) is shifted by a first angle θ1 toward one end in the second direction relative to the first optical axis (A1) of the ultraviolet light from the irradiating part (60). Therefore, it is possible to avoid the ultraviolet light reflected from the first reflecting part (71) hitting the irradiating part (60). Preferably, the second optical axis (A2) is shifted by a predetermined angle inward in the second direction relative to the first optical axis (A1).

[0114] Let L1 be the distance from C1 to the third surface (56). In this case, it is preferable that the first reflecting part (71) is configured such that R1 ≥ L1. If R1 is smaller than L1, the focal point f1 of the first reflecting surface (72) will be closer to the first reflecting part (71) than the midpoint M on X1, for example, as shown by focal point f1a in Figure 13. As a result, the second optical axis (A2) of the ultraviolet light reflected by the first reflecting part (71) will deviate from the germicidal space (S) in a second direction, as shown by the optical axis (A2a) in Figure 13. In contrast, by setting R1 ≥ L1, it is possible to suppress the ultraviolet light reflected from the first reflecting part (71) from deviating from the germicidal space (S) in a second direction.

[0115] The first reflecting part (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) (towards one end in the first direction), for example, as shown by focal point f1b in Figure 13. As a result, the ultraviolet light reflected by the first reflecting part (71) (second optical axis (A2)) will approach the irradiating part (60), as shown by the optical axis (A2b) in Figure 13. In contrast, by setting R1 ≤ 2 × L, the approach of ultraviolet light reflected from the first reflecting part (71) to the irradiating part (60) can be suppressed, and consequently, the deterioration of the irradiating part (60) can be suppressed.

[0116] (7-7) Modification 7 Modification 7 further includes a second reflective portion (80) in the configuration of Modification 6. As shown in Figure 14, the second reflective portion (80) is provided on the third surface (56) side. The second reflective portion (80) extends to both ends in the second direction of the sterilization space (S). The second reflective portion (80) has a second reflective surface (82). When viewed in cross-section in the third direction, the second reflective surface (82) is formed in an arc shape that is concave toward one end in the first direction. In other words, when viewed in cross-section in the third direction, the second reflective surface (82) has a curved shape that is concave toward one end in the first direction. It is preferable that the second reflective surface (82) has a curved shape that is concave toward one end in the first direction when viewed in cross-section in the second direction. In other words, it is preferable that the second reflective surface (82) is spherical or parabolic. This prevents ultraviolet light reflected by the second reflective surface (82) from leaking out of the sterilization space (S) to the outside in the third direction.

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

[0118] In Figure 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] Let L2 be the distance from C1 to C2. In this case, the first reflecting section (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 modified example 6 described above.

[0120] The second reflecting portion (80) preferably satisfies the relationship of R2 ≥ L2. If R2 is smaller than L2, similar to the first reflecting portion (71) described above, the focal point 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 of 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 reflections thereof 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) is likely to reach 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) is likely to reach 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 FIG. 14 and FIG. 15. Therefore, the first reflecting portion (71) and the second reflecting portion (80) may be configured such that the respective radii of curvature 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 conditioning device (10), or it may be composed of a part of the air conditioning casing (30a) and other elemental components of the air conditioning device (10). For example, the first surface (54) and the second surface (55) of the flow path forming member shown in Figure 5 may be composed of the above-mentioned elemental 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 conditioning device (10). The flow path forming member of the ultraviolet irradiation unit (50) does not necessarily have to be frame-shaped, and may have a surface that defines a sterilization space (S) through which air passes.

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

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

[0128] The air conditioning system (10) is a paired type having one indoor unit (30) and one outdoor unit (20). However, the air conditioning system (10) may also 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 conditioning system (10) may also be a ventilation system for ventilating the air, an air purifier for purifying the air, or a humidity control system for humidifying or dehumidifying the air. In other words, "air conditioning" as used here includes not only temperature control of the air, but also ventilation, air purification, and humidity control of the air.

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

[0131] The designations "1st," "2nd," "3rd," etc., mentioned above are used to distinguish between the terms to which these designations are attached, and do not limit the number or order of those terms. [Industrial applicability]

[0132] As described above, this disclosure is useful for ultraviolet irradiation units, air conditioning systems, and air ducts. [Explanation of Symbols]

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

Claims

1. A flow channel forming member (51) in which a sterilization space (S) through which air flows is formed, An irradiation unit (60) is positioned at one end of the sterilization space (S) in a first direction and irradiates ultraviolet light toward the other end in the first direction, The sterilization space (S) is provided with a first reflecting unit (71) positioned on the other end side in the first direction, which reflects ultraviolet light irradiated from the irradiation unit (60) back to the one end side in the first direction, With respect to the optical axis of ultraviolet light from the irradiation unit (60), the optical axis of the reflected light from the first reflecting unit (71) is shifted by a first angle θ1 toward one end in a second direction perpendicular to the first direction. 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. The flow path forming member (51) is configured such that air flows from one side to the other in a third direction perpendicular to the first and second directions. In the third viewing direction, the first optical axis (A1) of ultraviolet light extending from the irradiation unit (60) reaches the first reflecting unit (71), In the third viewing direction, the second optical axis (A2) of the first reflected light extending from the first reflecting portion (71) does not overlap with the irradiation portion (60) and reaches the inner surface of one end of the sterilization space (S) in the first direction. UV irradiation unit.

2. A flow channel forming member (51) in which a sterilization space (S) through which air flows is formed, An irradiation unit (60) is positioned at one end of the sterilization space (S) in a first direction and irradiates ultraviolet light toward the other end in the first direction, The sterilization space (S) is provided with a first reflecting unit (71) positioned on the other end side in the first direction, which reflects ultraviolet light irradiated from the irradiation unit (60) back to the one end side in the first direction, With respect to the optical axis of ultraviolet light from the irradiation unit (60), the optical axis of the reflected light from the first reflecting unit (71) is shifted by a first angle θ1 toward one end in a second direction perpendicular to the first direction. 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. The flow path forming member (51) is configured such that air flows from one side to the other in a third direction perpendicular to the first and second directions. The sterilization space (S) is provided with a second reflecting part (80) positioned at one end in the first direction, which reflects ultraviolet light irradiated from the first reflecting part (71) toward the other end in the first direction, With respect to the optical axis of the first reflecting part (71), the optical axis of the reflected light from the second reflecting part (80) is shifted by a second angle θ2 toward one end in the second direction. In the third viewing direction, the first optical axis (A1) of ultraviolet light extending from the irradiation unit (60) reaches the first reflecting unit (71), In the third viewing direction, the second optical axis (A2) of the first reflected light extending from the first reflecting portion (71) does not overlap with the irradiating portion (60) and reaches the second reflecting portion (80). UV irradiation unit.

3. In the sterilization space (S), the third length in the third direction is smaller than the first length and the second length. The ultraviolet irradiation unit according to claim 1 or 2.

4. Let L be the distance in the second direction from the first surface (54), which is the inner surface of one end of the sterilization space (S), to the starting point P1 of the ultraviolet light from the irradiation unit (60), and let b be the distance in the second direction from the starting point P1 to the starting point P2 of the reflected light from the first reflecting unit (71). The relationship b ≤ L / 2 is satisfied. The ultraviolet irradiation unit according to claim 1.

5. Let L be the distance in the second direction from the first surface (54), which is the inner surface of one end of the sterilization space (S), to the starting point P1 of the ultraviolet light from the irradiation unit (60), and let a be the distance in the first direction from the starting point P1 to the starting point P2 of the reflected light from the first reflecting unit (71). First angle θ1<2tan -1 The relationship (L / 2a) is satisfied. The ultraviolet irradiation unit according to claim 1.

6. The first angle θ1 is 30 degrees or less. The ultraviolet irradiation unit according to claim 1.

7. The ultraviolet reflectance at the first reflecting portion (71) is 50% or more. The ultraviolet irradiation unit according to claim 1.

8. An air conditioning system comprising an ultraviolet irradiation unit (50) according to claim 1 or 2.

9. The air conditioning casing (30a) having an air passage (43) is formed, The flow path forming member (51) is positioned in the air passage (43). The air conditioning device according to claim 8.

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