air conditioning equipment

Abstract

To improve sanitary property of air blown out into a room, on an air conditioning device that takes and uses outdoor air.SOLUTION: An air conditioning device (10) includes: an indoor unit (20) for conditioning internal air of a room; and a hose (13) for transferring humidified outdoor air to the indoor unit (20). The hose (13) is a pipe body constituting an air flow passage (15) having a relatively narrow sectional area of 8000 mm2 or less. The air conditioning device (10) further includes an irradiation device (80) for sterilizing an internal surface (14) of the hose (13) by irradiating it with an ultraviolet ray.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioning apparatus. [Background technology]

[0002] Patent Document 1 discloses an air conditioner that takes in outdoor air to ventilate the room. An ultraviolet lamp is installed in front of the heat exchanger inside the indoor unit of this air conditioner. The ultraviolet lamp irradiates ultraviolet light when ventilating the room by taking in outdoor air, and sterilizes the air blown into the room from the air outlet of the indoor unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-265399 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, microorganisms such as mold and bacteria can grow on the inner surface of the pipes that transport outdoor air to the indoor unit. When microorganisms grow on the inner surface of the pipes, many of the grown microorganisms are introduced into the air sent to the indoor unit through the pipes as it flows through the pipes. For this reason, it becomes difficult to sufficiently sterilize the air even if ultraviolet light is irradiated for only a short time on the air passing through a local area inside the indoor unit, as in the air conditioner of Patent Document 1.

[0005] An object of the present disclosure is to improve the hygiene of air blown into a room in an air conditioner that takes in and utilizes outdoor air. [Means for solving the problem]

[0006] A first aspect of the present disclosure is an air conditioner (10) including an indoor unit (20) for conditioning indoor air, a pipe (13) for transporting outdoor air to the indoor unit (20), and a sterilizer (80) for sterilizing an inner surface (14) of the pipe (13). 2 This refers to the tube that forms the relatively narrow air flow path described below.

[0007] In the first aspect, the sterilization device (80) sterilizes the inner surface (14) of the pipe (13). Sterilizing the inner surface (14) of the pipe (13) can suppress the growth of microorganisms such as mold and bacteria on the inner surface (14) of the pipe (13). This reduces the number of microorganisms that are introduced into the air sent to the indoor unit (20) through the pipe (13) while the air flows through the pipe (13). This improves the hygienic quality of the air blown into the room by the air conditioner (10).

[0008] A second aspect of the present disclosure is the air conditioner (10) of the first aspect, wherein the sterilization device (80) has an ultraviolet light source (81) that irradiates ultraviolet light.

[0009] In the second embodiment, an ultraviolet light source (81) irradiates the inner surface (14) of the pipe (13) with ultraviolet light. The ultraviolet light has a sterilizing effect on microorganisms. The ultraviolet light source (81) can be used as a sterilization device (80) that sterilizes the inner surface (14) of the pipe (13).

[0010] A third aspect of the present disclosure is the air conditioner (10) of the second aspect, wherein the ultraviolet light source (81) is an ultraviolet LED (Light Emitting Diode) (81).

[0011] In the third embodiment, an ultraviolet LED (81) is used as the ultraviolet light source (81). The ultraviolet LED (81) is smaller than other ultraviolet light sources (81) such as ultraviolet lamps. This is advantageous for placing the sterilization device (80) inside the piping (13).

[0012] A fourth aspect of the present disclosure is the air conditioner (10) of the third aspect, wherein the ultraviolet LED (81) irradiates ultraviolet light in the direction in which the pipe (13) extends.

[0013] In the fourth aspect, ultraviolet light is emitted from the ultraviolet LEDs (81) in the direction in which the pipe (13) extends. When ultraviolet light is emitted in this manner, the air flowing through the pipe (13) and the inner surface (14) of the pipe (13) are exposed to the ultraviolet light over a relatively wide area in the direction in which the pipe (13) extends. This allows a relatively long reaction time of the ultraviolet light to the microorganisms in the air, and the outdoor air is suitably sterilized while flowing through the pipe (13).

[0014] A fifth aspect of the present disclosure is the air conditioning apparatus (10) of the fourth aspect, wherein the ultraviolet LED (81) is arranged at an inlet (16) into which air flows in the pipe (13), and irradiates ultraviolet light downstream in the air flow direction in the pipe (13).

[0015] In the fifth aspect, ultraviolet light is irradiated from the inlet (16) of the pipe (13) toward the downstream side in the air flow direction. The outdoor air conveyed to the indoor unit (20) by the pipe (13) is sterilized by ultraviolet light at the inlet (16) of the pipe (13). Microorganisms such as germs contained in the outdoor air are sterilized when they flow into the pipe (13). This makes it possible to prevent microorganisms in the outdoor air from attaching to and multiplying on the inner surface (14) of the pipe (13).

[0016] A sixth aspect of the present disclosure is the air conditioning apparatus (10) of the third or fourth aspect, wherein the ultraviolet LED (81) is arranged at an outlet (17) from which air flows out of the pipe (13), and irradiates ultraviolet light toward the upstream side in the air flow direction in the pipe (13).

[0017] In the sixth aspect, ultraviolet light is irradiated from the outlet (17) of the pipe (13) toward the upstream side in the air flow direction. The outdoor air transported through the pipe (13) to the indoor unit (20) is sterilized by ultraviolet light at the outlet (17) of the pipe (13). Microorganisms such as germs contained in the outdoor air transported through the pipe (13) are sterilized when they flow out of the pipe (13). This makes it possible to reduce the number of microorganisms in the outdoor air transported through the pipe (13) before it is sent to the indoor unit (20).

[0018] A seventh aspect of the present disclosure is the air conditioning apparatus (10) of the second aspect, wherein the ultraviolet light source (81) is provided inside the pipe (13) such that an irradiation unit (84) that irradiates ultraviolet light faces an inner surface (14) of the pipe (13).

[0019] In the seventh aspect, ultraviolet light is emitted from the irradiation portion 84 of the ultraviolet light source 81, which is directed toward the inner surface 14 of the pipe 13. When the irradiation portion 84 of the ultraviolet light source 81 is directed toward the inner surface 14 of the pipe 13, a large amount of ultraviolet light is irradiated onto the inner surface 14 of the pipe 13. This is advantageous for sterilizing the inner surface 14 of the pipe 13.

[0020] An eighth aspect of the present disclosure is the air conditioner (10) of any one of the first to seventh aspects, further comprising a humidifier (50) connected to the indoor unit (20) via the pipe (13). The pipe (13) is a pipe (13) that conveys outdoor air humidified by the humidifier (50).

[0021] In the eighth aspect, outdoor air humidified by the humidifier (50) is conveyed to the indoor unit (20) through the pipe (13). When the humidifier (50) is operating, the humidity in the pipe (13) becomes relatively high. When the temperature of the pipe (13) itself or the temperature of the air in the pipe (13) drops, condensation occurs on the inner surface (14) of the pipe (13), creating an environment favorable for the growth of microorganisms such as mold and bacteria. Sterilizing the inner surface (14) of the pipe (13) using the sterilizer (80) is effective in suppressing the growth of microorganisms in such an environment.

[0022] A ninth aspect of the present disclosure is the air conditioner (10) of the eighth aspect, wherein the sterilization device (80) includes an ultraviolet LED (81) that irradiates ultraviolet light. The ultraviolet light irradiated by the ultraviolet LED (81) has a wavelength of not less than 200 nm and not more than 380 nm.

[0023] In the ninth aspect, the ultraviolet light emitted from the ultraviolet LED (81) has a wavelength of 200 nm or more and 380 nm or less. By irradiating the inner surface (14) of the pipe (13) with ultraviolet light having such a wavelength that easily penetrates water, the inner surface (14) of the pipe (13) can be effectively sterilized even if condensation occurs on the inner surface (14) of the pipe (13).

[0024] A tenth aspect of the present disclosure is the air conditioner (10) of the eighth or ninth aspect, further comprising a control unit (70) that controls operation of an ultraviolet LED (81) included in the sterilization device (80). The control unit (70) controls the ultraviolet LED (81) to irradiate ultraviolet light when the humidity in the pipe (13) falls below a predetermined value.

[0025] In a tenth aspect, ultraviolet light is irradiated onto the inner surface (14) of the pipe (13) when the humidity inside the pipe (13) is equal to or lower than a predetermined value. When the humidity inside the pipe (13) is low, the sterilizing effect of ultraviolet light irradiation is enhanced. Furthermore, by setting the predetermined value used as the basis for determining whether to irradiate ultraviolet light to a humidity value at which condensation is unlikely to occur inside the pipe (13), ultraviolet light can be irradiated at a timing when there is little or no condensation on the inner surface (14) of the pipe (13). This prevents the ultraviolet light from being attenuated by condensed water, and allows the ultraviolet light irradiation to effectively sterilize the inner surface (14) of the pipe (13).

[0026] An eleventh aspect of the present disclosure is the air conditioner (10) of any one of the second to tenth aspects, wherein the inner surface (14) of the pipe (13) has a reflecting portion (18) that reflects ultraviolet light.

[0027] In the eleventh aspect, ultraviolet light emitted from the ultraviolet light source (81) is reflected by the reflecting portion (18) of the inner surface (14) of the pipe (13) and propagates in the direction of extension of the pipe (13). When the ultraviolet light propagates through the pipe (13), the irradiation range of the ultraviolet light spreads in the direction of extension of the pipe (13). As a result, the irradiation of the ultraviolet light can sterilize a relatively wide area of ​​the inner surface (14) of the pipe (13). [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a conceptual diagram illustrating the configuration of an air conditioner. [Figure 2] FIG. 2 is an overall configuration diagram of the air conditioner, including a refrigerant circuit and an air flow path. [Figure 3] FIG. 3 is a conceptual diagram illustrating the main parts of the air conditioning device. [Figure 4] FIG. 4 is a block diagram of the air conditioner. [Figure 5] FIG. 5 is a flowchart relating to the sterilization process for the inner surface of the piping of an air conditioner. [Figure 6] FIG. 6 is a conceptual diagram illustrating the main parts of an air conditioning apparatus according to a modified example. [Figure 7] FIG. 7 is a conceptual diagram illustrating the main parts of an air conditioning apparatus according to a modified example. [Figure 8] FIG. 8 is a conceptual diagram illustrating the main parts of an air conditioning apparatus according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. Note that the technology of the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical concept of the present disclosure. Since the drawings are intended to conceptually explain the technology of the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary to facilitate understanding.

[0030] -Air conditioning unit configuration- The air conditioner (10) is a device that adjusts the temperature and humidity of air in a target space. The target space is an indoor space (SI). The air conditioner (10) is a pair-type air conditioner that includes one indoor unit (20) and one outdoor unit (30). As shown in FIGS. 1 and 2, the air conditioner (10) includes the indoor unit (20), the outdoor unit (30), a humidifier (50), and a control unit (70).

[0031] The indoor unit (20) and the outdoor unit (30) are connected to each other via a liquid connection pipe (11) and a gas connection pipe (12). The liquid connection pipe (11) and the gas connection pipe (12) are connected to a pipe joint provided in the indoor unit (20) and a stop valve provided in the outdoor unit (30), respectively. The indoor unit (20) and the humidifier (50) are connected to each other via a hose (13).

[0032] The indoor unit (20), the outdoor unit (30), the liquid connecting pipe (11), and the gas connecting pipe (12) constitute a refrigerant circuit (40). The refrigerant circuit (40) is filled with a refrigerant. The refrigerant is, for example, R32 (difluoromethane). The refrigerant circuit (40) performs a vapor compression refrigeration cycle by circulating the refrigerant. The refrigerant circuit (40) mainly includes a compressor (35), an outdoor heat exchanger (37), an expansion valve (38), a four-way selector valve (39), and an indoor heat exchanger (27).

[0033] The refrigerant circuit (40) is configured so that the function of the indoor heat exchanger (27) can be switched between an evaporator and a radiator. Specifically, the refrigerant circuit (40) performs a first refrigeration cycle or a second refrigeration cycle in response to switching of the four-way selector valve (39). The first refrigeration cycle is a refrigeration cycle in which the indoor heat exchanger (27) functions as an evaporator. The second refrigeration cycle is a refrigeration cycle in which the indoor heat exchanger (27) functions as a radiator.

[0034] <Outdoor unit> The outdoor unit (30) is installed outdoors. The outdoor unit (30) includes a casing (31), a compressor (35), an outdoor fan (36), an outdoor heat exchanger (37), an expansion valve (38), and a four-way selector valve (39). The compressor (35), the outdoor fan (36), the outdoor heat exchanger (37), the expansion valve (38), and the four-way selector valve (39) are housed in the casing (31).

[0035] The casing (31) is formed with an inlet (32) and an outlet (33). The inlet (32) is an opening for drawing in outdoor air. The outlet (33) is an opening for blowing out air that has exchanged heat with the outdoor heat exchanger (37). An internal flow path (34) extending from the inlet (32) to the outlet (33) is provided inside the casing (31).

[0036] The compressor (35) compresses the refrigerant by being driven by a motor. The compressor (35) is a rotary compressor. The rotary compressor (35) is, for example, a swing type, a rolling piston type, or a scroll type compressor. The compressor (35) is configured so that the discharge capacity of the refrigerant can be changed by adjusting the operating frequency (number of rotations) of the motor.

[0037] The outdoor fan (36) and the outdoor heat exchanger (37) are disposed in the internal flow path (34). The outdoor fan (36) is rotated by a motor to take in outdoor air into the internal flow path (34) and transport the air. The air transported by the outdoor fan (36) is drawn into the internal flow path (34) through the air inlet (32). The air drawn into the internal flow path (34) passes through the outdoor heat exchanger (37). The air that has passed through the outdoor heat exchanger (37) is blown out through the air outlet (33). The outdoor fan (36) is, for example, a propeller fan.

[0038] The outdoor heat exchanger (37) exchanges heat between the outdoor air transported by the outdoor fan (36) and the refrigerant inside. The outdoor heat exchanger (37) is a fin-and-tube heat exchanger. The expansion valve (38) reduces the pressure of the refrigerant. The expansion valve (38) is, for example, an electronic or temperature-sensitive expansion valve. The expansion valve (38) may be a capillary tube. The four-way selector valve (39) reverses the flow of the refrigerant in the refrigerant circuit (40).

[0039] The four-way selector valve (39) is switchable between a first state (a state indicated by a solid line in FIG. 2 ) and a second state (a state indicated by a dashed line in FIG. 2 ). In the first state, the four-way selector valve (39) connects the discharge side of the compressor (35) to the gas side of the outdoor heat exchanger (37) and connects the suction side of the compressor (35) to the gas side of the indoor heat exchanger (27). In the second state, the four-way selector valve (39) connects the discharge side of the compressor (35) to the gas side of the indoor heat exchanger (27) and connects the suction side of the compressor (35) to the gas side of the outdoor heat exchanger (37).

[0040] The outdoor unit (30) is provided with a first control device (71) and various sensors. The sensors provided in the outdoor unit (30) include an outdoor air temperature sensor (SN1). The outdoor air temperature sensor (SN1) is a sensor that detects the temperature of outdoor air. A detection signal indicating the temperature of outdoor air is input from the outdoor air temperature sensor (SN1) to the first control device (71).

[0041] <Humidifier> The humidifier (50) is installed outdoors. In this example, the humidifier (50) is integrated with the outdoor unit (30). The humidifier (50) is a device that takes in moisture from outdoor air to generate high-humidity air and sends the high-humidity air to the indoor unit (20). The humidifier (50) has a casing (51), a humidification rotor (58), a first fan (59), a switching damper (60), a heater (63), and a second fan (64). The humidification rotor (58), the first fan (59), the switching damper (60), the heater (63), and the second fan (64) are housed in the casing (51).

[0042] The casing (51) is formed with an inlet (52), an outlet (53), and an inlet / exhaust port (55). The inlet (52) is an opening for drawing in outdoor air for moisture absorption. The outlet (53) is an opening for discharging the air after moisture absorption. The inlet / exhaust port (55) is an opening for drawing in outdoor air or discharging indoor air. The casing (51) is provided with a first flow path (54) extending from the inlet (52) to the outlet (53) and a second flow path (57) extending from the inlet / exhaust port (55) to a connection port (56) to which the hose (13) is connected.

[0043] The humidification rotor (58) is disposed across the first flow path (54) and the second flow path (57). The humidification rotor (58) is, for example, a disc-shaped ceramic rotor. The humidification rotor (58) is made of an adsorbent such as silica gel, zeolite, or alumina. The adsorbent constituting the humidification rotor (58) has the property of adsorbing moisture in the air with which it comes into contact. Furthermore, the adsorbent has the property of desorbing the adsorbed moisture when heated.

[0044] The humidification rotor (58) is rotated by the drive of a motor. The humidification rotor (58) has a moisture absorption region (58a) and a moisture release region (58b). The moisture absorption region (58a) is a region that adsorbs moisture in the air and is configured in a portion of the humidification rotor (58) located in the first flow path (54). The moisture release region (58b) is a region that desorbs moisture into the air and is configured in a portion of the humidification rotor (58) located in the second flow path (57).

[0045] The first fan (59) is disposed in the first flow path (54). The first fan (59) is rotated by the motor to take in and transport outdoor air into the first flow path (54). The air transported by the first fan (59) is drawn into the first flow path (54) through the inlet (52). The air drawn into the first flow path (54) passes through the moisture absorption region (58a) of the humidification rotor (58). The moisture absorption region (58a) of the humidification rotor (58) adsorbs moisture from the air passing through it. The air from which moisture has been desorbed is discharged through the exhaust port (53).

[0046] The switching damper (60) is disposed in the second flow path (57). The switching damper (60) has a first port (61) and a second port (62). The first port (61) is connected to the intake / exhaust port (55). The second port (62) is connected to the connection port (56) of the casing (51) for connecting to the hose (13). The switching damper (60) is switched between a first state and a second state by driving a motor. In the first state, the switching damper (60) uses the first port (61) as an inlet for sucking air. In the second state, the switching damper (60) uses the second port (62) as an inlet for sucking air.

[0047] The heater (63) is disposed in the second flow path (57) between the intake / exhaust port (55) and the switching damper (60). The heater (63) heats the air flowing through the second flow path (57). The heater (63) is configured to have variable output. The temperature of the air passing through the heater (63) changes depending on the output of the heater (63). The second fan (64) is disposed between the first inlet / outlet (61) and the second inlet / outlet (62) of the switching damper (60). The second fan (64) is rotated by the drive of a motor to take in outdoor air or indoor air into the second flow path (57) and transport the air.

[0048] When the switching damper (60) is in the first state, the second fan (64) generates an air flow (a flow in the direction indicated by the solid arrow in FIG. 2 ) from the first inlet / outlet (61) to the second inlet / outlet (62). At this time, the air transported by the second fan (64) is outdoor air, which is drawn into the second flow path (57) through the intake / exhaust port (55). The air flowing through the second flow path (57) passes through the heater (63) and the moisture release region (58b) of the humidification rotor (58), in that order. The air heated by the heater (63) heats the moisture release region (58b) of the humidification rotor (58). The heated moisture release region (58b) of the humidification rotor (58) adds moisture to the air passing through it. The highly humidified air is then sent from the connection port (56) into the hose (13) as humidification air.

[0049] When the switching damper (60) is in the second state, the second fan (64) generates an air flow from the second inlet / outlet (62) toward the first inlet / outlet (61) (a flow in the direction indicated by the dashed arrow in FIG. 2). At this time, the air transported by the second fan (64) is indoor air sent from the indoor unit (20) through the hose (13), and is sucked into the second flow path (57) through the connection port (56). The air flowing through the second flow path (57) is discharged through the intake / exhaust port (55).

[0050] The humidifier (50) is provided with an outdoor air humidity sensor (SN2). The outdoor air humidity sensor (SN2) is a sensor that detects the humidity of outdoor air. The humidity of outdoor air detected by the outdoor air humidity sensor (SN2) is, for example, relative humidity. The outdoor air humidity sensor (SN2) is connected to the first control device (71). A detection signal indicating the humidity of outdoor air is input from the outdoor air humidity sensor (SN2) to the first control device (71).

[0051] <Indoor unit> The indoor unit (20) is installed indoors. The indoor unit (20) is a wall-mounted air conditioning indoor unit attached to the wall (WL) of the room (RM). The indoor unit (20) conditions the air in the room. The indoor unit (20) has a casing (21), an indoor fan (25), an air filter (26), and an indoor heat exchanger (27). The indoor fan (25), the air filter (26), and the indoor heat exchanger (27) are housed in the casing (21).

[0052] The casing (21) is formed with an inlet (22) and an outlet (23). The inlet (22) is an opening for drawing in indoor air. The outlet (23) is an opening for blowing out air that has exchanged heat with the indoor heat exchanger (27) or air for humidification. The outlet (23) is provided with a flap (28) for adjusting the direction of the blown air. An internal flow path (24) extending from the inlet (22) to the outlet (23) is provided inside the casing (21).

[0053] The indoor fan (25), the air filter (26), and the indoor heat exchanger (27) are disposed in the internal flow path (24). The indoor fan (25) is rotated by a motor to take in and transport indoor air. The air transported by the indoor fan (25) is drawn into the internal flow path (24) through the air inlet (22). The air flowing through the internal flow path (24) passes through the air filter (26) and the indoor heat exchanger (27) in this order. The air that has passed through the indoor heat exchanger (27) is blown out through the air outlet (23). The indoor fan (25) is, for example, a cross-flow fan.

[0054] The air filter (26) is disposed in the internal flow path (24) upstream of the indoor heat exchanger (27). The air filter (26) collects dust and other particles in the air sent from the inlet (22) to the indoor heat exchanger (27). The indoor heat exchanger (27) is disposed in the internal flow path (24) upstream of the indoor fan (25). The indoor heat exchanger (27) exchanges heat between the indoor air transported by the indoor fan (25) and the refrigerant inside. The indoor heat exchanger (27) is a fin-and-tube heat exchanger.

[0055] The indoor unit (20) is provided with a second control device (72) and various sensors. The sensors provided in the indoor unit (20) include an indoor air temperature sensor (SN3) and an indoor air humidity sensor (SN4). The indoor air temperature sensor (SN3) is a sensor that detects the temperature of indoor air. The temperature detected by the indoor air temperature sensor (SN3) is the temperature of intake air. The indoor air humidity sensor (SN4) is a sensor that detects the humidity of indoor air.

[0056] The humidity detected by the room air humidity sensor (SN4) is the absolute humidity of the intake air. The room air temperature sensor (SN3) may detect the relative humidity of the room air (intake air). The second control device (72) receives a detection signal indicating the temperature of the room air from the room air temperature sensor (SN3). The second control device (72) also receives a detection signal indicating the humidity of the room air from the room air humidity sensor (SN4).

[0057] <Irradiation device> As shown in FIG. 3, the air conditioner (10) further includes an irradiation device (80). The irradiation device (80) constitutes a sterilizer that sterilizes the inner surface (14) of the hose (13). The hose (13) is a pipe that conveys outdoor air (humidification air) humidified by the humidifier (50) to the indoor unit (20). The hose (13) is flexible. The hose (13) constitutes a relatively narrow air flow path (15). The cross-sectional area of ​​the air flow path (15) is 500 mm 2 For example, the outer diameter of the hose (13) is about 35 mm, and the inner diameter of the hose (13) is about 25 mm.

[0058] The hose (13) has an air inlet (16) and an air outlet (17). The air inlet (16) is an opening through which humidified outdoor air flows and is connected to a connection port (56) of the humidifier (50). The air outlet (17) is an opening through which the humidified outdoor air flows and is connected to the indoor unit (20). High-humidity air for humidification flows through the air flow path (15) in the hose (13). This results in a relatively high humidity inside the hose (13), making it easy for microorganisms such as mold and bacteria to grow on the inner surface (14) of the hose (13).

[0059] The inner surface 14 of the hose 13 is provided with a reflecting portion 18 that irradiates ultraviolet light. In this example, the reflecting portion 18 is formed by the inner surface 14 of the hose 13 itself. The hose 13 is formed, for example, from a plastic material that includes a reflective material that reflects ultraviolet light. The reflecting portion 18 may be formed from a reflective member such as a sheet or film that reflects ultraviolet light. An example of the reflective member is a metal foil made of aluminum or the like.

[0060] The irradiation device (80) is a device that irradiates the inner surface (14) of the hose (13) with ultraviolet light. The irradiation device (80) of this example has a plurality of ultraviolet LEDs (81). The ultraviolet LEDs (81) are an example of an ultraviolet light source. The plurality of ultraviolet LEDs (81) include a first ultraviolet LED (82) and a second ultraviolet LED (83). The first ultraviolet LED (82) and the second ultraviolet LED (83) each have an irradiation section (84) that irradiates ultraviolet light.

[0061] The first ultraviolet LED (82) is disposed at the air inlet (16) of the hose (13). The first ultraviolet LED (82) is provided with an irradiation section (84) facing from the air inlet (16) of the hose (13) toward the back of the air flow path (15). The irradiation section (84) of the first ultraviolet LED (82) irradiates ultraviolet light in the extension direction of the hose (13). The first ultraviolet LED (82) irradiates ultraviolet light toward the downstream side in the air flow direction inside the hose (13).

[0062] The second ultraviolet LED (83) is disposed at the air outlet (17) of the hose (13). The second ultraviolet LED (83) is provided with an irradiation section (84) facing from the air outlet (17) of the hose (13) toward the back of the air flow path (15). The irradiation section (84) of the second ultraviolet LED (83) irradiates ultraviolet light in the extension direction of the hose (13). The second ultraviolet LED (83) irradiates ultraviolet light toward the upstream side in the air flow direction inside the hose (13).

[0063] The ultraviolet light emitted by the first ultraviolet LED (82) and the second ultraviolet LED (83) has a wavelength of 200 nm or more and 380 nm or less. The ultraviolet light emitted from the first ultraviolet LED (82) is reflected by the reflecting portion (18) of the inner surface (14) of the hose (13) and propagates from the air inlet (16) to the back side of the air flow path (15). The ultraviolet light emitted from the second ultraviolet LED (83) is reflected by the reflecting portion (18) of the inner surface (14) of the hose (13) and propagates from the air outlet (17) to the back side of the air flow path (15).

[0064] <Control Unit> The control unit (70) controls the operation of the indoor unit (20), the outdoor unit (30), and the humidifier (50). The control unit (70) further controls the operation of the irradiation device (80). As shown in Fig. 4, the control unit (70) includes a first control device (71), a second control device (72), and a remote controller (73).

[0065] The first control device (71) and the second control device (72) each include a microcomputer, a memory, and a communication interface. The microcomputer performs various processes based on software stored in the memory. The memory stores various software and data for operating the microcomputer. The first control device (71) and the second control device (72) are connected to each other so that they can communicate with each other.

[0066] The remote controller (73) has a display unit (74) and an input unit (75). The display unit (74) displays predetermined information such as the operating state and set temperature of the air conditioner (10). The display unit (74) is configured, for example, by a liquid crystal display panel. The input unit (75) accepts input operations from the user to make various settings. The input unit (75) includes switches, buttons, or a touch panel.

[0067] The remote controller (73) is communicably connected to the second control device (72). The remote controller (73) is placed in a position in the room where a user can operate it. The remote controller (73) transmits an instruction signal instructing the operation of the air conditioner (10) (such as cooling operation, heating operation, or humidifying operation) to the second control device (72) in response to a user's operation on the input unit (75).

[0068] Upon receiving the instruction signal from the remote controller (73), the second control device (72) transmits the instruction signal to the first control device (71). Then, the second control device (72) controls the operation of the indoor fan (25) and the angle of the flap (28) in accordance with the received instruction signal.

[0069] Upon receiving the instruction signal from the second control device (72), the first control device (71) controls, in accordance with the instruction signal, the operation of the compressor (35), the outdoor fan (36), the expansion valve (38), and the four-way switching valve (39), and the operation of the humidification rotor (58), the first fan (59), the switching damper (60), the heater (63), and the second fan (64). The first control device (71) further controls, in accordance with the received instruction signal, the operation of the irradiation device (80), i.e., the light emission of the first ultraviolet LED (82) and the second ultraviolet LED (83).

[0070] The control unit (70) switches between a cooling operation, a heating operation, and a humidifying operation in response to an operation instruction from a user using the remote controller (73). During the humidifying operation, the control unit (70) operates the irradiation device (80) based on the humidity in the hose (13). Specifically, when the relative humidity in the hose (13) falls below a predetermined value, the control unit (70) causes the first ultraviolet LED (82) and the second ultraviolet LED (83) to irradiate ultraviolet light. Here, the predetermined value is set to, for example, 70% or less.

[0071] -Air conditioning unit operation- The air conditioner (10) performs cooling operation, heating operation, ventilation operation, and humidification operation. The cooling operation, heating operation, ventilation operation, and humidification operation are started in the control unit (70) when the second control device (72) receives an instruction signal from the remote controller (73) instructing the control unit (70) to perform the operation, and are stopped when the second control device (72) receives an instruction signal instructing the control unit (70) to stop the operation.

[0072] <Cooling operation> The cooling operation is an operation in which indoor air is cooled by the indoor heat exchanger (27) serving as an evaporator. In the cooling operation, the control unit (70) sets the four-way selector valve (39) to the first state. The control unit (70) operates the compressor (35), the outdoor fan (36), and the indoor fan (25). The control unit (70) appropriately adjusts the opening of the expansion valve (38). In the cooling operation, a first refrigeration cycle is performed in which compressed refrigerant releases heat in the outdoor heat exchanger (37) and evaporates in the indoor heat exchanger (27).

[0073] The control unit (70) controls the rotation speed of the compressor (35) and the like so that the indoor temperature detected by the indoor air temperature sensor (SN3) converges to the cooling temperature set by the remote controller (73). In the indoor unit (20), the indoor fan (25) operates to draw indoor air into the internal flow path (24) through the air inlet (22). The air drawn into the internal flow path (24) passes through the indoor heat exchanger (27). The indoor heat exchanger (27) cools the air passing through. The air cooled by the indoor heat exchanger (27) is supplied to the indoor space (SI) through the air outlet (23).

[0074] <Heating operation> The heating operation is an operation in which indoor air is heated by the indoor heat exchanger (27) serving as a radiator. In the heating operation, the control unit (70) sets the four-way selector valve (39) to the second state. The control unit (70) operates the compressor (35), the outdoor fan (36), and the indoor fan (25). The control unit (70) appropriately adjusts the opening of the expansion valve (38). In the heating operation, a second refrigeration cycle is performed in which compressed refrigerant radiates heat in the indoor heat exchanger (27) and evaporates in the outdoor heat exchanger (37).

[0075] The control unit (70) controls the rotation speed of the compressor (35) and the like so that the indoor temperature detected by the indoor air temperature sensor (SN3) converges to the heating temperature set by the remote controller (73). In the indoor unit (20), the indoor fan (25) operates to draw indoor air into the internal flow path (24) through the air inlet (22). The air drawn into the internal flow path (24) passes through the indoor heat exchanger (27). The indoor heat exchanger (27) heats the air passing through. The air heated by the indoor heat exchanger (27) is supplied to the indoor space (SI) through the air outlet (23).

[0076] <Ventilation operation> The ventilation operation is an operation for ventilating the room air. In the ventilation operation, the control unit (70) stops the heater (63), the humidification rotor (58), and the first fan (59), and operates the second fan (64). The control unit (70) stops the compressor (35), the outdoor fan (36), and the indoor fan (25). In the ventilation operation, the refrigeration cycle is not performed in the refrigerant circuit (40). The control unit (70) switches the switching damper (60) between a first state and a second state.

[0077] The ventilation operation is in an air supply state when the switching damper (60) is in the first position, and in an exhaust state when the switching damper (60) is in the second position. In the air supply state, outdoor air is taken into the humidifier (50) through the intake and exhaust port (55), transported to the indoor unit (20) through the hose (13), and then supplied to the indoor space (SI) through the air outlet (23) of the indoor unit (20). In the exhaust state, indoor air is taken into the indoor unit (20), transported to the humidifier (50) through the hose (13), and then exhausted through the intake and exhaust port (55).

[0078] <Humidification operation> The humidification operation is an operation in which the humidifier (50) humidifies the room air. In the humidification operation, the control unit (70) sets the switching damper (60) to the first state. The control unit (70) operates the heater (63), the humidification rotor (58), and the first fan (59). The control unit (70) stops the compressor (35) and the outdoor fan (36). In the humidification operation, the refrigeration cycle is not performed in the refrigerant circuit (40).

[0079] The control unit (70) calculates the relative humidity of the room air based on the room temperature detected by the room air temperature sensor (SN3) and the humidity (absolute humidity) of the room space (SI) detected by the room air temperature sensor (SN3). The control unit (70) controls the rotation speeds of the first fan (59) and the second fan (64) and the output of the heater (63) so that the calculated relative humidity converges to a set humidity set by the remote controller (73).

[0080] In the humidifier (50), the second fan (64) is operated to draw outdoor air into the second flow path (57) through the intake / exhaust port (55). The air drawn into the second flow path (57) is heated by the heater (63) and then passes through the moisture release region (58b) of the humidification rotor (58). The humidification rotor (58) adds moisture to the air passing through the moisture release region (58b). The moistened, highly humid air is transported through the hose (13) to the indoor unit (20) and supplied to the room space (SI) through the air outlet (23) of the indoor unit (20).

[0081] <Operation of the irradiation device during humidification operation> In the humidification operation, the irradiation device (80) irradiates the inside of the hose (13) with ultraviolet light to sterilize the inside of the hose (13). Control related to the sterilization process of the inside of the hose (13) will be described below with reference to the flowchart of FIG.

[0082] When the air conditioner (10) starts operating, the control unit (70) starts control related to the sterilization treatment inside the hose (13). As shown in FIG. 5, in step ST1, the control unit (70) determines whether or not an instruction to perform a humidification operation has been issued by the remote controller (73). If it is determined in step ST1 that an instruction to perform a humidification operation has not been issued (NO), the control unit (70) repeats step ST1. If it is determined in step ST1 that an instruction to perform a humidification operation has been issued (YES), the control unit (70) performs step ST2.

[0083] In step ST2, the control unit (70) performs a humidification operation. Then, the control unit (70) switches the irradiation device (80) to an ON state. When the irradiation device (80) is switched to an ON state, the first ultraviolet LED (82) and the second ultraviolet LED (83) are turned on and emit ultraviolet light. The ultraviolet light is irradiated onto the inner surface (14) of the hose (13). The inner surface (14) of the hose (13) is exposed to the ultraviolet light and sterilized. The ultraviolet light is also irradiated onto the humidification air flowing through the air flow path (15) in the hose (13). The humidification air flowing through the air flow path (15) is exposed to the ultraviolet light and sterilized.

[0084] When the humidification operation starts, step ST3 is performed. In step ST3, the control unit (70) determines whether an instruction to stop the humidification operation has been issued by the remote controller (70). If it is determined in step ST6 that an instruction to stop the humidification operation has not been issued (NO), the control unit (70) returns to step ST2, continues the humidification operation, and step ST3 is performed again. If it is determined in step ST3 that an instruction to stop the humidification operation has been issued (YES), step ST4 is performed.

[0085] In step ST4, the control unit (70) stops the humidification operation. Then, the control unit (70) turns off the irradiation device (80). When the irradiation device (80) is in the off state, the first ultraviolet LED (82) and the second ultraviolet LED (83) are turned off and do not irradiate ultraviolet light. When the humidification operation is stopped, step ST5 is performed.

[0086] In step ST5, the control unit (70) determines whether the humidity in the hose (13) is equal to or lower than a predetermined value (e.g., 70%). At this time, the control unit (70) acquires the relative humidity as the humidity in the hose (13). The relative humidity in the hose (13) is estimated based on the humidity of the outdoor air detected by the outdoor air humidity sensor (SN2) or the humidity of the indoor air detected by the indoor air humidity sensor (SN4). The relative humidity in the hose (13) may be estimated by big data analysis of predetermined physical quantities (current, voltage, air pressure, temperature, etc.) in or outside the hose (13).

[0087] If it is determined in step ST5 that the humidity inside the hose (13) is higher than the predetermined value (No), the determination in step ST5 is repeated until the humidity inside the hose (13) becomes equal to or lower than the predetermined value. For example, if the relative humidity inside the hose (13) is higher than 70%, condensation is likely to occur on the inner surface (14) of the hose (13) when the temperature of the hose (13) itself or the temperature of the air inside the hose (13) drops. When condensation occurs on the inner surface (14) of the hose (13), the ultraviolet light is attenuated by the condensed water. When condensation is likely to occur on the inner surface (14) of the hose (13) in this way, the sterilizing effect of ultraviolet light irradiation is weakened, and therefore, the irradiation device (80) is put on standby before being turned on.

[0088] If it is determined in step ST5 that the humidity inside the hose (13) is equal to or lower than the predetermined value (YES), step ST6 is performed. In step ST6, the control unit (70) turns on the irradiation device (80). When the irradiation device (80) is turned on, the inner surface (14) of the hose (13) is exposed to ultraviolet light emitted from the first ultraviolet LED (82) and the second ultraviolet LED (83) and sterilized. By waiting until the humidity inside the hose (13) decreases before starting irradiation of ultraviolet light by the irradiation device (80), the sterilization effect on the inner surface (14) of the hose (13) is enhanced.

[0089] When the irradiation device (80) is turned on in step ST6, step ST7 is performed. In step ST7, the control unit (70) determines whether a predetermined time (e.g., 30 minutes) has elapsed since the irradiation device (80) was turned on. If it is determined in step ST7 that the predetermined time has not elapsed (NO), step ST7 is repeated until the predetermined time has elapsed since the irradiation device (80) was turned on.

[0090] If it is determined in step ST7 that the predetermined time has elapsed (YES), step ST8 is performed. In step ST8, the control unit (70) turns off the irradiation device (80). When the irradiation device (80) is turned off in step ST8, the control unit (70) ends control of the sterilization process in the hose (13).

[0091] -Features of the embodiment- The air conditioner (10) includes an irradiation device (80) that irradiates the inner surface (14) of the hose (13) with ultraviolet light. When the irradiation device (80) irradiates the inner surface (14) of the hose (13), the inner surface (14) is sterilized. The sterilizing effect of the ultraviolet light can inhibit the growth of microorganisms such as mold and bacteria on the inner surface (14) of the hose (13). This reduces the number of microorganisms that are introduced into the humidified air sent to the indoor unit (20) through the hose (13) while the air flows through the hose (13). This improves the hygiene of the humidified air blown into the room by the air conditioner (10).

[0092] In the air conditioner (10), an ultraviolet LED (81) is used as an ultraviolet light source constituting the irradiation device (80). The ultraviolet LED (81) is smaller than other ultraviolet light sources such as ultraviolet lamps. This is advantageous for disposing the ultraviolet light source constituting the irradiation device (80) inside the hose (13). Therefore, the irradiation device (80) can be incorporated into the hose (13) in a compact manner.

[0093] In the air conditioner (10), the ultraviolet LEDs (81) irradiate ultraviolet light in the direction in which the hose (13) extends. When ultraviolet light is irradiated in this manner, the air flowing through the hose (13) is exposed to the ultraviolet light over a relatively wide area in the direction in which the hose (13) extends, together with the inner surface (14) of the hose (13). This allows a relatively long reaction time of the ultraviolet light to microorganisms in the air. Therefore, the humidification air is suitably sterilized while flowing through the hose (13).

[0094] In the air conditioner (10), the first ultraviolet LED (82) is disposed at the air inlet (16) of the hose (13) and irradiates ultraviolet light downstream in the air flow direction in the hose (13). The humidified air conveyed to the indoor unit (20) by the hose (13) is sterilized by ultraviolet light at the air inlet (16) of the hose (13). Microorganisms such as germs contained in the humidified air are sterilized when they flow into the hose (13). This makes it possible to prevent microorganisms in the humidified air from attaching to and multiplying on the inner surface (14) of the hose (13).

[0095] In the air conditioner (10), the second ultraviolet LED (83) is disposed at the air outlet (17) of the hose (13) and irradiates ultraviolet light upstream in the air flow direction in the hose (13). The humidified air conveyed by the hose (13) to the indoor unit (20) is sterilized by ultraviolet light at the air outlet (17) of the hose (13). Microorganisms such as germs contained in the humidified air conveyed through the hose (13) are sterilized when the air flows out of the hose (13). This makes it possible to reduce the number of microorganisms in the humidified air conveyed through the hose (13) before it is sent to the indoor unit (20).

[0096] In the air conditioner (10), the ultraviolet light emitted from the ultraviolet LED (81) has a wavelength of not less than 200 nm and not more than 380 nm. By irradiating the inner surface (14) of the hose (13) with ultraviolet light having such a wavelength that easily penetrates water, the inner surface (14) of the hose (13) can be effectively sterilized even if condensation has formed on the inner surface (14) of the hose (13).

[0097] In the air conditioner (10), the control unit (70) causes the ultraviolet LED (81) to irradiate ultraviolet light when the humidity inside the hose (13) falls below a predetermined value. When the humidity inside the hose (13) is low, the sterilizing effect of ultraviolet light irradiation is enhanced. In addition, by setting the predetermined value used as the basis for determining whether to irradiate ultraviolet light to a humidity value (e.g., 70%) at which condensation is unlikely to occur inside the hose (13), ultraviolet light can be irradiated at a timing when there is little or no condensation on the inner surface (14) of the hose (13). This prevents the ultraviolet light from being attenuated by condensed water, and allows the inner surface (14) of the hose (13) to be sterilized effectively by ultraviolet light irradiation.

[0098] In the air conditioner (10), the inner surface (14) of the hose (13) has a reflecting portion (18) that reflects ultraviolet light. The ultraviolet light emitted from the ultraviolet LED (81) is reflected by the reflecting portion (18) of the inner surface (14) of the hose (13) and propagates in the direction in which the hose (13) extends. When the ultraviolet light propagates through the hose (13), the irradiation range of the ultraviolet light spreads in the direction in which the hose (13) extends. This allows the inner surface (14) of the hose (13) and the humidification air to be sterilized over a relatively wide range.

[0099] -Variations- The above embodiment may be configured as follows.

[0100] The irradiation device (80) may irradiate the inner surface (14) of the hose (13) with ultraviolet light at a position midway along the length of the hose (13). For example, as shown in Fig. 6, a first ultraviolet LED (82) may be provided midway along the length of the hose (13) with its irradiation unit (84) facing the air inlet (16), and a second ultraviolet LED (83) may be provided midway along the length of the hose (13) with its irradiation unit (84) facing the air outlet (17). In this case, the first ultraviolet LED (82) irradiates ultraviolet light upstream in the direction of air flow within the hose (13). The second ultraviolet LED (83) irradiates ultraviolet light downstream in the direction of air flow within the hose (13).

[0101] The irradiation device (80) may irradiate the inner surface (14) of the hose (13) with ultraviolet light at multiple locations along the length of the hose (13). For example, as shown in FIG. 7, the irradiation device (80) may include multiple ultraviolet LEDs (81) arranged at intervals along the length of the hose (13). The multiple ultraviolet LEDs (81) are arranged on one radial side of the hose (13). Each of the multiple ultraviolet LEDs (81) is provided with its irradiation portion (84) facing the inner surface (14) of the hose (13). The multiple ultraviolet LEDs (81) may be provided as a tape light integrated into a tape shape or as a tube light integrated into a tube shape.

[0102] In this irradiation device (80), ultraviolet light is irradiated from the irradiation portion (84) of each ultraviolet LED (81) directed toward the inner surface (14) of the hose (13). When the irradiation portion (84) of the ultraviolet LED (81) is directed toward the inner surface (14) of the hose (13), a large amount of ultraviolet light is irradiated onto the inner surface (14) of the hose (13). This is advantageous for sterilizing the inner surface (14) of the hose (13). Therefore, the proliferation of microorganisms on the inner surface (14) of the hose (13) can be effectively suppressed.

[0103] 8, the ultraviolet LEDs (81) may be provided on both sides of the hose (13) in the radial direction, forming a row of ultraviolet LEDs (81) facing each other. The irradiation device (80) may include only one ultraviolet LED (81). The single ultraviolet LED (81) may irradiate ultraviolet light in the extension direction of the hose (13), or may irradiate ultraviolet light toward the inner surface (14) of the hose (13).

[0104] The air conditioner (10) may have a ceiling-mounted indoor unit (20). Here, the ceiling-mounted indoor unit (20) includes a ceiling-embedded type in which the indoor unit (20) is embedded in the ceiling surface, and a ceiling-suspended type in which the indoor unit (20) is suspended from the upper wall. The indoor unit (20) may also be a floor-standing type or a duct type installed above the ceiling.

[0105] The air conditioner (10) may be a multi-type air conditioner having a plurality of indoor units (20). The air conditioner (10) may have a plurality of outdoor units (30). The air conditioner (10) may have a plurality of humidifiers (50). The humidifiers (50) may be separate from the outdoor units (30).

[0106] The control unit (70) may turn on the irradiation device (80) when the air conditioner (10) is not operating. For example, the control unit (70) may turn on the irradiation device (80) immediately after the end of the humidification operation or after a predetermined time has elapsed since the end of the humidification operation. In this case, the irradiation device (80) irradiates the inner surface (14) of the hose (13) with ultraviolet light. After the humidification operation, the humidity inside the hose (13) increases, creating an environment conducive to the proliferation of microorganisms. Therefore, sterilizing the inner surface (14) of the hose (13) after the humidification operation is effective in suppressing the proliferation of microorganisms.

[0107] The control unit (70) may perform a ventilation operation after the humidification operation is completed, and may turn on the irradiation device (80) during or after the ventilation operation is completed. In this case, the ventilation operation may be performed in an air supply state, an air exhaust state, or both the air supply state and the air exhaust state by switching between them. When the ventilation operation is performed, the humidity inside the hose (13), which was increased during the humidification operation, decreases. This reduces the likelihood of condensation forming on the inner surface of the hose. By turning on the irradiation device (80) in this state, the ultraviolet light emitted from the ultraviolet LEDs (81) can be prevented from being attenuated by water, and the inner surface (14) of the hose (13) can be suitably sterilized by ultraviolet light irradiation.

[0108] The control unit (70) may change the output of the irradiation device (80) depending on the humidity (e.g., relative humidity) inside the hose (13). For example, the control unit (70) may increase the amount of ultraviolet light emitted by the ultraviolet LED (81) when the relative humidity inside the hose (13) is equal to or higher than a predetermined value (e.g., 70%) compared to when the relative humidity inside the hose (13) is lower than the predetermined value. In this way, even if condensation forms on the inner surface (14) of the hose (13), the inner surface (14) of the hose (13) can be exposed to an effective amount of ultraviolet light and suitably sterilized.

[0109] The hose (13) is merely an example of a pipe, and any pipe that conveys outdoor air to the indoor unit (20) may be subject to sterilization treatment by the irradiation device (80), even if it does not convey humidifying air. 2 It refers to a pipe that forms a relatively narrow air flow path with a diameter of 100 mm or less (for example, 100 mm or less). This "piping" includes long, thin, flexible hoses and tubes, as well as long, thin, rigid pipes, but does not include ducts with a relatively large cross-sectional area that are installed in the ceiling or elsewhere. The "piping" in question is not limited to pipes with a circular cross-section, but may also be pipes with other cross-sectional shapes, such as a rectangular cross-section.

[0110] Although the embodiments 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. Furthermore, the above embodiments and modifications may be combined or substituted as appropriate as long as the functionality of the subject matter of the present disclosure is not impaired.

[0111] The terms "first," "second," "third," etc. mentioned above are used to distinguish the terms to which these terms are attached, and do not limit the number or order of the terms. [Industrial Applicability]

[0112] As described above, the present disclosure is useful for air conditioning apparatuses. [Explanation of symbols]

[0113] 10 Air conditioning equipment 13 Hose (piping) 14 Inner 18 Reflector 20 Indoor unit 50 humidifier 70 Control Unit 80 Irradiation device (sterilization device) 81 Ultraviolet LED (ultraviolet light source)

Claims

1. an indoor unit (20) for conditioning the air in the room; a pipe (13) for conveying outdoor air to the indoor unit (20); an irradiation device (80) that sterilizes the inner surface (14) of the pipe (13) by irradiating the inner surface (14) with ultraviolet light; a control unit (70) that controls the operation of the irradiation device (80), The control unit (70) controls the operation of the irradiation device (80) depending on the humidity in the pipe (13).

2. The air conditioning apparatus according to claim 1, The air conditioner, wherein the irradiation device (80) has an ultraviolet light source (81) that irradiates ultraviolet light.

3. The air conditioning apparatus according to claim 2, The air conditioner, wherein the ultraviolet light source (81) is an ultraviolet LED (81).

4. The air conditioning apparatus according to claim 3, The ultraviolet LED (81) irradiates ultraviolet light in the direction in which the pipe (13) extends.

5. The air conditioning apparatus according to claim 4, The air conditioning apparatus is configured such that the ultraviolet LED (81) is disposed at an inlet (16) of the pipe (13) through which air flows in, and irradiates ultraviolet light toward a downstream side in the air flow direction in the pipe (13).

6. The air conditioning apparatus according to claim 3 or 4, The ultraviolet LED (81) is disposed at an outlet (17) of the pipe (13) through which air flows out, and irradiates ultraviolet light toward an upstream side in the air flow direction in the pipe (13).

7. The air conditioning apparatus according to claim 2, the ultraviolet light source (81) is provided in the pipe (13), The air conditioner, wherein an irradiation section (84) of the ultraviolet light source (81) that irradiates ultraviolet light is directed toward an inner surface (14) of the pipe (13) along a radial direction of the pipe (13).

8. The air conditioning apparatus according to any one of claims 2 to 7, The ultraviolet light source (81) is provided midway along the length of the pipe (13).

9. The air conditioning apparatus according to any one of claims 1 to 8, the system further comprises a humidifier (50) connected to the indoor unit (20) via the pipe (13); The air conditioner, wherein the pipe (13) is a pipe for transporting outdoor air humidified by the humidifier (50).

10. The air conditioning apparatus according to claim 9, The irradiation device (80) has an ultraviolet LED (81) that irradiates ultraviolet light, The air conditioner, wherein the ultraviolet light emitted by the ultraviolet LED (81) has a wavelength of 200 nm or more and 380 nm or less.

11. The air conditioning apparatus according to claim 10, The control unit (70) causes the ultraviolet LED (81) to irradiate ultraviolet light when the humidity in the pipe (13) falls to a predetermined value or less.

12. The air conditioning apparatus according to any one of claims 2 to 11, The air conditioner, wherein the inner surface (14) of the pipe (13) has a reflecting portion (18) that reflects ultraviolet light.

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