Air conditioner

Abstract

This air conditioner (100) comprises a refrigerant circuit and a housing (9) that accommodates the refrigerant circuit. A condenser (2) and an evaporator (4) are disposed in a first space within the internal space of the housing (9). A compressor (1), an expansion valve (3), and at least one brazing part (6) are disposed in a second space within the internal space. The housing (9) has formed therein a first suction port (101) for allowing air suctioned from the outside by a fan (5) to flow into the first space, and a second suction port (102) for allowing the air suctioned from the outside by the fan (5) to flow into the second space.

Description

air conditioning equipment

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

[0002] Among refrigerants with low global warming potential (GWP), there are flammable (including slightly flammable) refrigerants. As a technology for detecting leakage of refrigerants with low GWP, Japanese Patent Laid-Open Publication No. 2015-175531 (Patent Document 1) discloses a technology for improving the detection accuracy of a refrigerant detection sensor.

[0003] The refrigeration unit disclosed in JP 2015-175531 A (Patent Document 1) forms an isolated space by separating a pipe joint of a heat exchanger with an isolation member, and by restricting the passage of airflow between the isolated space and the surrounding space, points prone to refrigerant leakage are concentrated in the isolated space. The refrigeration unit disclosed in JP 2015-175531 A (Patent Document 1) prevents refrigerant leaking from a pipe joint from diffusing into the surrounding space when refrigerant leaks, and increases the refrigerant concentration in the isolated space, thereby improving the detection accuracy of a refrigerant detection sensor.

[0004] Japanese Patent Application Laid-Open No. 2015-175531

[0005] The technology of JP 2015-175531 A (Patent Document 1) makes it possible to concentrate locations where refrigerant is likely to leak, but there is a risk that the refrigerant will stagnate in the isolated space when the refrigerant leaks.

[0006] An object of the present disclosure is to provide an air conditioning apparatus that can consolidate points where refrigerant is likely to leak, while preventing refrigerant from accumulating in an isolated space when the refrigerant leaks.

[0007] The air conditioning apparatus of the present disclosure includes a refrigerant circuit configured to circulate a refrigerant and a housing that houses the refrigerant circuit. The refrigerant circuit includes a compressor, a condenser, an expansion device, an evaporator, and a fan. The compressor, condenser, expansion device, and evaporator are connected by a plurality of pipes brazed at at least one brazed portion. The condenser and evaporator are disposed in a first space within the interior space of the housing. The compressor, expansion device, and the at least one brazed portion are disposed in a second space within the interior space. The housing is formed with a first air inlet through which air drawn in from the outside by the fan flows into the first space, and a second air inlet through which air drawn in from the outside by the fan flows into the second space.

[0008] According to the air conditioning device of the present disclosure, at least one brazed portion that is prone to refrigerant leakage is concentrated in the second space, and air is flowed into the second space by a fan, thereby preventing the refrigerant from stagnating in the isolated space in the event of a refrigerant leakage.

[0009] 1 is a diagram showing the shape of an air conditioning apparatus according to embodiment 1. FIG. 2 is a diagram showing an air conditioning apparatus according to embodiment 1. FIG. 3 is a diagram showing an air conditioning apparatus according to a modified example of embodiment 1. FIG. 4 is a diagram showing the flow of refrigerant in a condenser and an evaporator according to embodiment 1. FIG. 5 is a diagram showing an air conditioning apparatus according to embodiment 2. FIG. 6 is a diagram showing a second shielding member and air flow according to embodiment 2. FIG. 7 is a diagram showing a second shielding member according to a modified example of embodiment 2. FIG. 8 is a diagram showing an air conditioning apparatus according to embodiment 3. FIG. 9 is a diagram showing an air conditioning apparatus according to a modified example of embodiment 3. FIG. 10 is a diagram showing an air conditioning apparatus according to a modified example of embodiment 3. FIG. 11 is a diagram showing a first shielding member according to embodiment 3. FIG. 12 is a diagram showing a first shielding member according to a modified example of embodiment 3. FIG. 13 is a diagram showing an air conditioning apparatus according to embodiment 4. FIG. 14 is a diagram showing an air conditioning apparatus according to embodiment 5. FIG. 15 is a diagram showing an air conditioning apparatus according to a modified example of embodiment 5. FIG. 16 is a diagram showing a first shielding member according to a modified example of embodiment 5. FIG. 17 is a diagram showing an air conditioning apparatus according to embodiment 6. FIG. 18 is a diagram showing an air conditioning apparatus according to a modified example of embodiment 6. FIG. 19 is a diagram showing the arrangement of a detection device according to embodiment 6. FIG. 19 is a flowchart showing processing executed in an air conditioning apparatus according to embodiment 6. FIG. 19 is a diagram showing an air conditioning apparatus according to embodiment 7. Fig. 10 is a flowchart showing processing executed in an air conditioning apparatus according to Embodiment 7. Fig. 11 is a diagram showing an air conditioning apparatus according to Embodiment 8. Fig. 12 is a diagram for explaining refrigerant leakage determination according to Embodiment 8.

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the embodiments described below, when numbers, quantities, etc. are mentioned, the scope of the present disclosure is not necessarily limited to those numbers, quantities, etc., unless otherwise specified. The same reference numerals are used for the same or equivalent parts, and redundant descriptions may not be repeated. It is intended from the beginning that the configurations in the embodiments may be used in appropriate combinations.

[0011] Embodiment 1. Figure 1 is a diagram showing the shape of an air conditioning apparatus 100 in embodiment 1. Figure 1(a) is a schematic diagram of the external shape of the air conditioning apparatus 100. Figure 1(b) is a schematic diagram of the cross-sectional shape of the air conditioning apparatus 100 taken along line X-X. The thick arrows shown in Figure 1 indicate the direction of air flow.

[0012] As shown in FIG. 1( a), the air conditioning apparatus 100 is an integrated refrigeration cycle apparatus in which an indoor unit and an outdoor unit are disposed within a housing 9. The air conditioning apparatus 100 has, for example, a dehumidifying function. The housing 9 has a substantially rectangular parallelepiped shape with a width L, a height H, and a depth D. A first air inlet 101 and a second air inlet 102 for drawing in outside air are formed side by side on the front side of the housing 9. Note that the first air inlet 101 and the second air inlet 102 may not be disposed side by side, but one of them may be disposed offset in the depth direction.

[0013] First air inlet 101 has dimensions of, for example, width L1 and height H1. Air drawn into first air inlet 101 from the outside passes through air path 1. Second air inlet 102 has dimensions of, for example, width L2 and height H1. Air drawn into second air inlet 102 from the outside passes through air path 2. Air paths 1 and 2 converge inside housing 9. The air that has passed through air paths 1 and 2 converge inside housing 9 and is blown out from the top of housing 9.

[0014] With respect to the width L of the housing 9, a gap of width L3 is formed on the opposite side of width L2 across width L1. The lengths in the width direction have the relationship L1 > L2 ≥ L3. Note that width L3 is not a structure for drawing in air, but may function as a third air inlet for drawing in air.

[0015] 1(b), the cross section of the air conditioning device 100 taken along line X-X has a shape in which the condenser 2, evaporator 4, and fan 5 are arranged inside the housing 9. The fan 5 is arranged higher in the height direction of the housing 9 than the condenser 2 and evaporator 4. In the air conditioning device 100, air drawn in by the fan 5 from the first air inlet 101 on the front side passes through the evaporator 4, then passes through the condenser 2, and is blown out from the top of the housing 9.

[0016] Fig. 2 is a diagram showing an air conditioning apparatus 100 according to Embodiment 1. The air conditioning apparatus 100 includes a refrigerant circuit and a control device 60 that controls the refrigerant circuit. The refrigerant circuit and control device 60 are housed in a housing 9. For convenience of illustration, the control device 60 is depicted outside the housing 9. The refrigerant circuit is configured to circulate refrigerant in the air conditioning apparatus 100. In Fig. 2, the flow of air inside the housing 9 is indicated by thick arrows, and the flow of refrigerant passing through the refrigerant circuit is indicated by thin arrows.

[0017] The refrigerant circuit includes a compressor 1, a condenser 2, an expansion valve 3, an evaporator 4, a fan 5, a plurality of brazed portions 6, and two first shielding members 7. The compressor 1, the condenser 2, the expansion valve 3, and the evaporator 4 are connected by a plurality of pipes brazed at a plurality of brazed portions 6 indicated by circles in FIG. 2 . In the refrigerant circuit, a refrigerant circulates through the pipes. The refrigerant is a refrigerant with a low GWP. For example, the refrigerant is a flammable refrigerant classified as 2L or more (e.g., A2L, A3, B2) according to the ASHRAE standard.

[0018] The compressor 1 draws in a refrigerant, compresses it, and discharges it. The condenser 2 exchanges heat between the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 and air. In the condenser 2, the gas refrigerant is condensed into a liquid phase through heat exchange. The condenser 2 is, for example, a fin-and-tube heat exchanger or a flat-tube heat exchanger. The expansion valve 3 reduces the pressure of the inflowing refrigerant and allows it to flow out. The expansion valve 3 is, for example, an expansion device such as an electronic expansion valve whose opening can be freely controlled. A thermostatic expansion valve or a capillary tube may also be used as the expansion device.

[0019] The evaporator 4 exchanges heat between the air and the two-phase gas-liquid refrigerant expanded by the expansion valve 3. In the evaporator 4, the two-phase gas-liquid refrigerant evaporates through heat exchange and changes into gas refrigerant. The evaporator 4 is, for example, a fin-and-tube heat exchanger. The drive of the fan 5 is controlled by the control device 60. The fan 5 draws air from the outside into the housing 9. It is preferable that the refrigerant flowing through the condenser 2 and the evaporator 4 be countercurrent to the air flow. By arranging the condenser 2 and the evaporator 4 so that the refrigerant flows countercurrently, the logarithmic mean temperature between the air and the refrigerant increases, improving heat transfer performance.

[0020] One of the first shielding members 7 is disposed in the internal space of the housing 9 between a first space in which the condenser 2 and the evaporator 4 are disposed and a second space in which the compressor 1, the expansion valve 3, and the brazed portions 6 are disposed. The other first shielding member 7 is disposed at a position of width L3 between the first space and the housing 9.

[0021] As shown in FIG. 1A , the housing 9 is formed with a first suction port 101 through which air drawn from the outside by the fan 5 flows into the first space, and a second suction port 102 through which air drawn from the outside by the fan 5 flows into the second space. Air drawn through the first suction port 101, which has a width L1, passes through the evaporator 4 and then the condenser 2. The path through which the air drawn through the first suction port 101 passes is indicated by air duct 1. The amount of air drawn through the first suction port 101 is indicated by suction air volume Q1. Air drawn through the second suction port 102, which has a width L2, passes through each element of the refrigerant circuit, including the compressor 1 and the expansion valve 3, and the brazed joints 6 connecting the elements. The path through which the air drawn through the second suction port 102 passes is indicated by air duct 2. The amount of air drawn through the second suction port 102 is indicated by suction air volume Q2.

[0022] 2, when fan 5 is driven, air is drawn into housing 9 and flows through air path 1, which passes through the first space, and air path 2, which passes through the second space. Fan 5 is located on the downwind side where air path 1 and air path 2 converge.

[0023] As shown in Figure 2, air passing through air path 1 at air volume Q1 and air passing through air path 2 at air volume Q2 join together inside housing 9 (air path 1 + air path 2) and are exhausted from housing 9 at air volume Q. Air volume Q1 is set to be larger than air volume Q2. Note that air path pressure loss may be provided on the suction side to adjust the suction air volume ratio. The air path pressure loss may be set by, for example, at least one of the following methods: changing the mesh size of the installed filter between first suction port 101 and second suction port 102; changing the shape of the air path; or changing the shape and arrangement of the suction ports.

[0024] The control device 60 includes a control unit 61 and a storage unit 62. The control device 60 is capable of communicating with each element of the refrigerant circuit, such as the compressor 1, the expansion valve 3, and the fan 5, in order to control each element of the refrigerant circuit.

[0025] The control unit 61 is a computing entity that controls each element of the refrigerant circuit by executing various programs. The control unit 61 is composed of a computer such as a processor. The processor may be, for example, a microcontroller, a central processing unit (CPU), or a microprocessing unit (MPU). The processor has the function of executing various processes by executing programs, but some or all of these functions may be implemented using dedicated hardware circuits such as an application-specific integrated circuit (ASIC) or a field-programmable gate array (FPGA). The term "processor" is not limited to a processor in the narrow sense that executes processes using stored programs, such as a CPU or MPU, but may also include hardwired circuits such as an ASIC or FPGA. Therefore, the term "processor" can also be interpreted as processing circuitry whose processes are predefined by computer-readable code and / or hardwired circuits. The processor may be composed of a single chip or multiple chips. Furthermore, the processor and related processing circuits may be composed of multiple computers interconnected by wire or wirelessly via a local area network or a wireless network. The processor and associated processing circuitry may be configured as a cloud computer that performs computations remotely based on input data and outputs the results of the computations to other devices at remote locations.

[0026] The memory unit 62 provides a storage area for storing program code, work memory, etc., when the processor of the control unit 61 executes various programs. The memory unit 62 may be one or more non-transitory computer-readable media. Examples of the memory unit 62 include volatile memories such as dynamic random access memory (DRAM) and static random access memory (SRAM), and non-volatile memories such as read-only memory (ROM) and flash memory. The memory unit 62 may also be one or more computer-readable storage media. Examples of the memory unit 62 include storage devices such as hard disk drives (HDDs) and solid-state drives (SSDs). The control unit 61 controls each element of the refrigerant circuit by executing the programs stored in the memory unit 62.

[0027] During operation, the control device 60 adjusts the frequency of the compressor 1, the rotation speed of the fan 5, etc. based on the detection results of detection devices (not shown) (for example, the suction temperature or suction pressure of the refrigerant in the compressor 1, the discharge temperature or discharge pressure of the refrigerant in the compressor 1, the temperature of the refrigerant in the heat exchanger, the suction temperature or humidity of the air, etc.).

[0028] For example, the control device 60 may control ON / OFF switching when the compressor 1 operates at a constant speed, and may control the frequency when the compressor 1 is inverter controlled. When the expansion valve 3 is not a fixed throttle, the control device 60 may control the opening degree of the expansion valve 3 based on the temperature difference between a temperature sensor capable of detecting the refrigerant temperature near the middle of the evaporator 4 and a temperature sensor capable of detecting the refrigerant temperature between the evaporator 4 and the suction side of the compressor 1. The control device 60 may control the opening degree of the expansion valve 3 based on the temperature difference between the refrigerant temperature on the discharge side of the compressor 1 and a target discharge temperature.

[0029] The control device 60 may prioritize a user setting (e.g., weak wind mode or strong wind mode) and control the rotation speed of the fan 5 according to the operating mode (e.g., weak wind mode when the humidity difference is small, or strong wind mode when the humidity difference is large) based on the humidity difference between the set humidity and the room humidity. When the air conditioning device 100 functions as a dehumidifier, the indoor temperature is likely to rise due to its characteristics. The control device 60 may reduce the frequency of the compressor 1 or stop the operation of the compressor 1 when the room temperature exceeds a preset temperature.

[0030] The flow of the refrigerant will be described in detail below. The refrigerant discharged from the compressor 1 flows into the condenser 2, where it exchanges heat with cooled air in the evaporator 4, and then flows into the expansion valve 3 in the second space. After being adiabatically expanded in the expansion valve 3, the refrigerant flows into the evaporator 4, where it exchanges heat with air drawn in from the outside, and returns to the compressor 1.

[0031] The flow of air will be described in detail. As the fan 5 rotates, air is drawn in from the outside via the first air inlet 101. This air is cooled and dehumidified by the evaporator 4 in the first space, reheated by the condenser 2, and heated to a temperature higher than when it was drawn in before flowing to the fan 5. As the fan 5 rotates, air is drawn in from the outside via the second air inlet 102. This air flows in the second space through the compressor 1, the expansion valve 3, and the brazed portions 6 before reaching the fan 5. The air that has passed through the air passages 1 and 2 is mixed in the fan 5 and blown out of the housing 9.

[0032] FIG. 3 is a diagram illustrating an air conditioning apparatus 100A according to a modified example of the first embodiment. The air conditioning apparatus 100A differs from the air conditioning apparatus 100 in that air is drawn in through an inlet (also referred to as a third inlet) with a width L3. The widthwise lengths are related as follows: L1 > L2 ≥ L3, and the air volume of the drawn air is related as follows: Q1 > Q2 ≥ Q3. The air volume Q3 may be changed by at least one of the following methods: changing the mesh size of the installed filter, changing the air path shape, or changing the gap (also referred to as a third space) between the housing 9 and the first shielding member 7. The air drawn in through the inlet (third inlet) with a width L3 flows to the fan 5 via the air path 3 formed in the third space. A hairpin part 21, described later, is disposed in the third space. The flow of air drawn in through the third inlet can prevent stagnation of the leaked refrigerant, for example, if the refrigerant leaks due to corrosion of the hairpin part 21. The air that has passed through air passages 1 , 2 , and 3 is mixed in fan 5 and blown out of housing 9 .

[0033] Figure 4 is a diagram showing the flow of refrigerant in the condenser 2 and the evaporator 4 according to the first embodiment. Figure 4(a) is a plan view, Figure 4(b) is a front view (viewed from the direction of the arrow (b) in Figure 4(a)), and Figure 4(c) is a left side view (viewed from the direction of the arrow (c) in Figure 4(a)). The dashed arrows in Figure 4 indicate the flow of refrigerant. The condenser 2 and the evaporator 4 are arranged sandwiched between first shielding members 7, 7.

[0034] The heat transfer tubes constituting the condenser 2 and the evaporator 4 have, in the refrigerant flow path, one end formed by a hairpin portion 21 without multiple brazed portions 6 and the other end formed by a U-bent portion 22 with multiple brazed portions 6. The hairpin portion 21 and the U-bent portion 22 are configured to pass through the first shielding member. The U-bent portion 22 and the heat transfer tube are brazed together by the multiple brazed portions 6 and are disposed in the second space.

[0035] The refrigerant discharged from the compressor 1 passes through the piping above the condenser 2, passes through the heat transfer tube of the condenser 2, turns back at the hairpin section 21, passes through the heat transfer tube again, and then turns back at the U-bent section 22, repeating this flow. As a result, the refrigerant flows from above the condenser 2 to below, and then flows from above the condenser 2 to the expansion valve 3 again.

[0036] The refrigerant flowing out of the expansion valve 3 passes through the piping above the evaporator 4, passes through the heat transfer tube of the evaporator 4, turns back at the hairpin section 21, passes through the heat transfer tube again, and then turns back at the U-bent section 22, repeating this flow. As a result, the refrigerant flows from above the evaporator 4 to below, and then flows from above the evaporator 4 to the compressor 1 again.

[0037] In the air conditioning apparatus 100 of the first embodiment and the air conditioning apparatus 100A of the modified example, air drawn in by the fan 5 passes separately through the first and second spaces separated by the first shielding member 7. The first space does not contain multiple brazed portions 6, and air passes through the condenser 2 and the evaporator 4 at an air volume Q1. In the second space, multiple brazed portions 6 are concentrated, and air passes through the compressor 1, the expansion valve 3, and multiple brazed portions 6 at an air volume Q2. As a result, the air conditioning apparatuses 100 and 100A concentrate multiple brazed portions 6, which are prone to refrigerant leakage, in the second space, while allowing air to flow into the second space by the fan 5, thereby preventing refrigerant from accumulating in the isolated space in the event of a refrigerant leak. In this way, the air conditioning apparatuses 100 and 100A can improve reliability by suppressing the formation of a flammable region within the housing 9.

[0038] In the air conditioning apparatus 100, 100A, the width L1 of the first air inlet 101 is wider than the width L2 of the second air inlet 102, so that the air volume Q1 in the first space where the condenser 2 and evaporator 4 that contribute to heat exchange are located can be made larger than the air volume Q2 in the second space that does not contribute to heat exchange. This makes it possible to suppress the inflow of excess air into the second space that does not contribute to heat exchange.

[0039] In a normal air conditioner, a portion of the total air volume is sucked in through gaps in the housing 9. The air conditioners 100 and 100A actively suck in air from the second air inlet 102 to intentionally form an air passage in the second space, and do not form an air passage that creates unnecessary resistance in the air passage 1 in the first space, and do not reduce dehumidification performance.

[0040] In the air conditioning apparatus 100, 100A, air flowing in through the first air inlet 101 and air flowing in through the second air inlet 102 are mixed and blown out of the housing 9. The air flowing in through the first air inlet 101 and the second air inlet 102 has at least twice the air volume as compared to when air is blown out through the second air inlet 102 alone, so the refrigerant can be diffused over a wider area in the event of a refrigerant leak. Because the air conditioning apparatus 100, 100A can diffuse the refrigerant over a wider area in the event of a refrigerant leak, it is possible to lengthen the time required for a flammable area to form indoors and improve safety through ventilation, etc.

[0041] Embodiment 2. Figure 5 is a diagram showing an air conditioning apparatus 200 according to embodiment 2. The air conditioning apparatus 200 differs from the air conditioning apparatus 100 of embodiment 1 in that it is provided with a second shielding member 8. Other configurations are the same as embodiment 1. The following description will focus on the differences from embodiment 1.

[0042] The air conditioning apparatus 200 includes a second shielding member 8. As shown in Fig. 5 , the second shielding member 8 is disposed between the second space and the fan 5 so as to contact one side of the first shielding member 7. In this way, the second shielding member 8 is disposed so as to block the cross section of the second air passage.

[0043] Figure 6 is a diagram showing the second shielding member 8 and the air flow according to embodiment 2. Figure 6(a) shows the second shielding member 8, and Figure 6(b) shows the air flow in the case of Figure 6(a). Figure 6(c) shows another embodiment of the second shielding member 8, and Figure 6(d) shows the air flow in the case of Figure 6(c). Figure 6(e) shows another embodiment of the second shielding member 8, and Figure 6(f) shows the air flow in the case of Figure 6(e).

[0044] As shown in Fig. 6(a), the second shielding member 8 is formed with round through-holes 8a that allow air flowing in from the second air inlet 102 to pass from the second space toward the fan 5. The second shielding member 8 may have through-holes 8a formed in multiple locations (for example, three locations) at a low position in the height direction as shown in Figs. 6(a) and 6(e), or may have one large through-hole 8c formed at a low position in the height direction as shown in Fig. 6(c). Note that while the second air inlet 102 is shown as air inlet only from the top in Fig. 6, a large opening may be provided within the range of height H1 shown in Fig. 1(a), or multiple air inlets may be provided.

[0045] The second shielding member 8 is arranged to block the cross section of the second air passage, and has through-holes 8 a, 8 c formed therein. This allows the air conditioning device 200 to arbitrarily set the direction of the air flow in the second space by adjusting the arrangement of the second air inlet 102 and the through-holes 8 a, 8 c.

[0046] The second shielding member 8 includes fixing portions 8b, 8d, and 8e. As shown in Figures 6(a) and 6(c), the fixing portions 8b and 8d are fixed to the bottom side of the housing 9 by a fixing method such as screwing or welding. As shown in Figure 6(e), the fixing portion 8e is fixed to the side surface of the first shielding member 7 by a fixing method such as screwing or welding. The fixing portions 8b, 8d, and 8e may be fixed with screws using L-angles.

[0047] The through-holes 8a and 8c are formed at a height lower than the second suction port 102. As shown in Figures 6(b), (d), and (f), a more preferable configuration is one in which the second suction port 102 is positioned higher and the through-holes 8a and 8c are positioned at the lowest part of the second shielding member 8. The through-holes 8a and 8c may be positioned at a height lower than the second suction port 102. This minimizes refrigerant accumulation in the event of a leak of refrigerant that is heavier than air, allowing the refrigerant to flow out of the through-holes 8a and 8c together with air. By minimizing refrigerant accumulation in the event of a leak, the air conditioning device 200 can suppress or prevent the formation of a flammable region and improve reliability.

[0048] 7 is a diagram showing a second shielding member 8 according to a modification of the second embodiment. A preventive member 10 is arranged around the second shielding member 8 shown in the modification to prevent air leakage between the inner surface of the housing 9 and the second shielding member 8. The preventive member 10 may be arranged on at least one of the four sides of the second shielding member 8. The preventive member 10 is preferably made of a material that maintains its shape when no pressure is applied and that does not generate air flow due to tight contact between the housing 9 and the second shielding member 8 when pressure is applied.

[0049] As shown in Figure 7(c), a preventive member hole 10a may be provided instead of the through-hole 8a. The preventive member hole 10a functions as a gap equivalent to the through-hole 8a. By providing the preventive member hole 10a, processing such as the through-holes 8a and 8c is not required, and the cost and time required for processing the through-hole 8a can be reduced. This allows the overall cost of the air conditioning device 200 to be reduced.

[0050] In this way, the air conditioning apparatus 200 can suppress airflow from unintended locations using the preventing member 10. In other words, the air conditioning apparatus 200 can increase the air volume (wind speed) to intended locations using the preventing member 10. This allows the air conditioning apparatus 200 to suppress the formation of a flammable area by increasing the air volume (wind speed).

[0051] In the air conditioning apparatus 100A according to the modified example of the first embodiment, a member equivalent to the second shielding member 8 or the preventing member 10 may be provided to form an air passage.

[0052] Embodiment 3. Figure 8 is a diagram showing an air conditioning apparatus 300 according to embodiment 3. The air conditioning apparatus 300 differs from the air conditioning apparatus 100 of embodiment 1 in that a second shielding member 8 without a through-hole is provided, and a first shielding member 7 disposed between the first space and the second space has a through-hole. The rest of the configuration is the same as embodiment 1. The following description will focus on the differences from embodiment 1.

[0053] The air conditioning device 300 includes a second shielding member 8. As shown in Fig. 8 , the second shielding member 8 is disposed between the second space and the fan 5 so as to contact one side of the first shielding member 7. In this manner, the second shielding member 8 is disposed so as to block the cross section of the second air passage. The first shielding member 7 disposed between the first space and the second space has a through-hole formed between the condenser 2 and the evaporator 4. The structure of the through-hole will be described in detail below.

[0054] As shown in FIG. 8 , when the fan 5 is driven, air drawn into the housing 9 flows through air passage 1, which passes through the first space, and air passage 2, which passes through the second space. The air in air passage 1 that flows in from the first air inlet 101 is cooled and dehumidified in the evaporator 4. The air in air passage 2 that flows in from the second air inlet 102 passes through the compressor 1, the expansion valve 3, and a plurality of brazed portions 6, passes through a through-hole provided in the first shielding member 7, and flows from the second space to the first space. The air cooled and dehumidified in the evaporator 4 and the air that passed through the through-hole provided in the first shielding member 7 join together and are reheated by the condenser 2. The air reheated by the condenser 2 is heated to a temperature higher than that of the air drawn in from outside the housing 9, flows to the fan 5, and is then discharged from the housing 9.

[0055] 9 is a diagram showing an air conditioning apparatus 300A according to a modification of Embodiment 3. The air conditioning apparatus 300A differs from the air conditioning apparatus 300 of Embodiment 3 in that it does not include the second shielding member 8 and the first shielding member 7A disposed between the first space and the second space is longer in the depth direction. A through-hole is formed in the first shielding member 7A between the condenser 2 and the evaporator 4.

[0056] FIG. 10 is a diagram illustrating an air conditioning apparatus 300B according to a modification of the third embodiment. The air conditioning apparatus 300B differs from the air conditioning apparatus 300A in that the length of the first shielding member 7B between the first space and the housing 9 is longer in the depth direction. A through-hole is formed in the first shielding member 7B between the condenser 2 and the evaporator 4. Air flowing into the air passage 3 formed in the third space passes through the through-hole provided in the first shielding member 7B and flows from the third space to the first space. The air cooled and dehumidified in the evaporator 4, the air passing through the through-holes provided in the first shielding member 7B, and the air passing through the through-holes provided in the first shielding member 7A are combined and then reheated by the condenser 2. The air reheated by the condenser 2 is heated to a temperature higher than that of air drawn in from outside the housing 9, flows to the fan 5, and is then discharged from the housing 9.

[0057] 11A and 11B are diagrams illustrating a first shielding member 7 according to the third embodiment. Fig. 11A illustrates the first shielding member 7, Fig. 11B illustrates another embodiment of the first shielding member 7, and Fig. 11C illustrates another embodiment of the first shielding member 7. Fig. 11A is a diagram viewed from the side of the condenser 2 and the evaporator 4 arranged in the first space, and a plan view of the first shielding member 7 is shown at the bottom of each diagram. The first shielding member 7 illustrated in Fig. 11 may be applied to the first shielding members 7A and 7B.

[0058] As shown in Fig. 11(a), the first shielding member 7 has three round through-holes 7a formed in the height direction to allow air flowing in from the second air inlet 102 to pass from the second space toward the first space. The through-holes may be formed as through-holes 7b driven by angle-adjustable louvers as shown in Fig. 11(b). The through-holes may be formed as slit-like through-holes 7c formed in the vertical direction as shown in Fig. 11(c).

[0059] Fig. 12 is a diagram showing a first shielding member 7 according to a modification of Embodiment 3. As shown in Fig. 12, the through-hole 7d may be formed at a position at height H1 that is lower than the second suction port 102. This allows the refrigerant, which is heavier than air, to flow out from the through-hole 7d together with air while minimizing refrigerant accumulation when the refrigerant leaks, as the refrigerant is heavier than air.

[0060] In a typical all-in-one air conditioner, the greater the airflow volume exchanging heat with the heat exchanger, the higher the evaporation temperature and the lower the condensation temperature during refrigeration cycle operation, resulting in less power consumption for the same evaporation capacity. However, in a device whose primary function is dehumidification, such as the air conditioner 300, increasing the airflow volume increases the amount of air passing through per hour (increasing the amount of moisture per hour). Meanwhile, in the air conditioner 300, an increase in evaporation temperature reduces the amount of heat generated by latent heat processing relative to the evaporation capacity (increasing the amount of heat generated by sensible heat processing), resulting in a decrease in the amount of dehumidification. Therefore, on the evaporator 4 side, there is an airflow volume at which the amount of dehumidification is maximized. On the other hand, on the condenser 2 side, the greater the airflow volume, the lower the condensation temperature can be, resulting in less power consumption.

[0061] In air conditioning devices 300, 300A, and 300B, air that passes through through-holes 7a to 7d from the second space passes through the first space between condenser 2 and evaporator 4. This prevents a flammable region from being formed inside housing 9, and makes it possible to increase the air volume passing through condenser 2 while maintaining the air volume passing through evaporator 4. In condenser 2, heat exchange is performed with the air volume that is the sum of air volume Q1 from first air inlet 101 and air volume Q2 from second air inlet 102, thereby improving the heat transfer performance on the condensation side and reducing the condensing temperature of the refrigeration cycle.

[0062] In this way, the air conditioning devices 300, 300A, and 300B can reduce power consumption during operation by reducing the condensation temperature. Reducing the condensation temperature leads to an expansion of the operating range at high outdoor temperatures, a reduction in the discharge temperature of the compressor 1 under the same operating conditions, and a reduction in the high-pressure pressure under the same operating conditions, thereby improving reliability. The air conditioning devices 300, 300A, and 300B can also improve dehumidification efficiency by reducing power consumption on the evaporator 4 side while maintaining the dehumidification amount.

[0063] Embodiment 4. Figure 13 is a diagram showing an air conditioning apparatus 400 according to embodiment 4. The air conditioning apparatus 400 differs from the air conditioning apparatus 100 of embodiment 1 in that the condenser 2 is divided into a first condenser 2a arranged on the downwind side of the first space and a second condenser 2b arranged on the upwind side. Furthermore, the air conditioning apparatus 400 differs from the air conditioning apparatus 100 of embodiment 1 in that a second shielding member 8 without a through-hole is provided, and a first shielding member 7 arranged between the first space and the second space has a through-hole. Other configurations are the same as those of embodiment 1. The following description will focus on the differences from embodiment 1.

[0064] The first condenser 2a and the second condenser 2b may be the same heat exchanger, but it is preferable that they are different heat exchangers. For example, the first condenser 2a may be a flat tube heat exchanger and the second condenser 2b may be a fin-and-tube heat exchanger.

[0065] The flow of refrigerant will be described in detail. As shown in Fig. 13, refrigerant discharged from compressor 1 flows into first condenser 2a, exchanges heat with air that has been heat-exchanged in second condenser 2b, passes through the second space, and then flows into second condenser 2b arranged in the first space. The refrigerant that flows into second condenser 2b exchanges heat with air that has been cooled in evaporator 4 and flows into expansion valve 3 in the second space. After adiabatic expansion in expansion valve 3, the refrigerant flows into evaporator 4, exchanges heat with air drawn in from the outside, and returns to compressor 1.

[0066] The air flow will be described in detail. As shown in Fig. 13, the through-hole in the first shielding member 7 is formed between the first condenser 2a and the second condenser 2b. As shown in Fig. 13, when the fan 5 is driven, air drawn into the housing 9 flows through air passage 1 passing through the first space and air passage 2 passing through the second space. The air in air passage 1 that flows in from the first air inlet 101 is cooled and dehumidified in the evaporator 4, and then heated in the second condenser 2b.

[0067] The air in air passage 2 that flows in from second air inlet 102 passes through compressor 1, expansion valve 3, and multiple brazed portions 6, passes through a through-hole provided in first shielding member 7, and flows from the second space to the first space between first condenser 2a and second condenser 2b. The air that is cooled and dehumidified in evaporator 4 and heated in second condenser 2b and the air that has passed through the through-hole provided in first shielding member 7 join together and are reheated by first condenser 2a. The air reheated by first condenser 2a is heated to a temperature higher than that of air drawn in from outside housing 9, flows to fan 5, and is then discharged from housing 9.

[0068] 14 is a diagram showing an air conditioning apparatus 400A according to a modification of Embodiment 4. The air conditioning apparatus 400A differs from the air conditioning apparatus 400 in that the length of the first shielding member 7B between the first space and the housing 9 is longer in the depth direction. A through-hole is formed in the first shielding member 7B between the first condenser 2a and the second condenser 2b. Air that flows into the air passage 3 formed in the third space passes through the through-hole provided in the first shielding member 7B and flows from the third space between the first condenser 2a and the second condenser 2b into the first space.

[0069] The air cooled and dehumidified in the evaporator 4 and heated in the second condenser 2b and the air that has passed through the through-holes provided in the first shielding member 7 and the first shielding member 7B join together on the intake side of the first condenser 2a and are then reheated by the first condenser 2a. The air reheated by the first condenser 2a is heated to a temperature higher than that of the air drawn in from outside the housing 9, and flows to the fan 5 before being discharged from the housing 9.

[0070] In the air conditioning devices 400 and 400A, the condenser 2 is divided into a first condenser 2a and a second condenser 2b in the depth direction of the housing 9. In the first condenser 2a, the refrigerant discharged from the compressor 1 flows primarily in a superheated gas state or a two-phase state. In the second condenser 2b, the refrigerant that has dissipated heat in the first condenser 2a flows primarily in a two-phase state or a supercooled state. In the air conditioning devices 400 and 400A, the position where the air flowing through air passage 2 (or air passage 3) and the air flowing through air passage 1 meet is set between the first condenser 2a and the second condenser 2b. This allows the air that is heat exchanged in the second condenser 2b, which may be in a supercooled state, to exchange heat with the air cooled by the evaporator 4.

[0071] The refrigerant that flows through the second condenser 2b and may become supercooled exchanges heat with the cooled air, thereby increasing the temperature difference and improving heat exchange performance. In the air conditioning apparatus 400, 400A, the degree of supercooling can be increased by heat exchange with the cooled air. In the air conditioning apparatus 400, 400A, increasing the degree of supercooling can increase the latent heat of evaporation on the cooling side, improving cooling capacity (improving dehumidification capacity).

[0072] In the air conditioning apparatus 400, 400A, the air flowing through air passage 2 (or air passage 3) and the air flowing through air passage 1 merge on the suction side of the first condenser 2a, where the refrigerant mainly flows in a superheated gas state or a two-phase state, thereby increasing the air volume flowing through the first condenser 2a. This improves the heat transfer performance of the first condenser 2a, lowering the compression ratio and reducing power consumption. In this way, the air conditioning apparatus 400, 400A not only improves cooling capacity (improves dehumidification capacity) and reduces power consumption, but also suppresses or prevents the formation of flammable regions.

[0073] By using the first condenser 2a as a flat tube heat exchanger and the second condenser 2b as a fin and tube type heat exchanger, even if condensation water generated in the evaporator 4 is scattered, it can be captured and vaporized in the second condenser 2b, and it is possible to suppress or prevent condensation water from adhering to and corroding the thin flat tubes.

[0074] Embodiment 5. Figure 15 is a diagram showing an air conditioning apparatus 500 according to embodiment 5. The air conditioning apparatus 500 differs from the air conditioning apparatus 400 of embodiment 4 in that the first condenser 2c, which is arranged on the downwind side, is wider in the width direction than the second condenser 2b, which is arranged on the upwind side. Furthermore, the air conditioning apparatus 500 differs from the air conditioning apparatus 400 of embodiment 4 in that no penetration portion is formed in the first shielding member 7. Other configurations are the same as those of embodiment 4. The following description will focus on the differences from embodiment 4.

[0075] As shown in Fig. 15, the first condenser 2c is disposed across the first space and the second space. Air flowing in from the first suction port 101 is heat exchanged in the order of the evaporator 4, the second condenser 2b, and the first condenser 2c. Air flowing in from the second suction port 102 is heat exchanged with a part of the first condenser 2c. The air flowing in from the second suction port 102 is heat exchanged with a part of the first condenser 2c without merging with the air flowing in from the first suction port 101.

[0076] The first condenser 2c and the second condenser 2b may be the same heat exchanger, but it is preferable that they are different heat exchangers. For example, the first condenser 2c may be a flat tube heat exchanger and the second condenser 2b may be a fin-and-tube heat exchanger.

[0077] The flow of the refrigerant will be described in detail. As shown in Figure 15, the refrigerant discharged from the compressor 1 flows into the first condenser 2c, where it exchanges heat with the air flowing through the second space and with the air that has exchanged heat in the second condenser 2b. After passing through the second space, the refrigerant flows into the second condenser 2b disposed in the first space. The refrigerant that flows into the second condenser 2b exchanges heat with the air cooled in the evaporator 4 and flows into the expansion valve 3 in the second space. The refrigerant is adiabatically expanded in the expansion valve 3, flows into the evaporator 4, exchanges heat with air drawn in from the outside, and returns to the compressor 1.

[0078] The air flow will be described in detail below. As shown in Fig. 15, when fan 5 is driven, air is drawn into housing 9 and flows through air path 1, which passes through the first space, and air path 2, which passes through the second space. Air flowing in through air path 1 from first air inlet 101 is cooled and dehumidified in evaporator 4, heated in second condenser 2b, and further heated in first condenser 2c.

[0079] The air in air passage 2 that flows in from second air intake 102 passes through compressor 1, expansion valve 3, and a plurality of brazed portions 6, and is heated in first condenser 2c, a portion of which is disposed in the second space. The air in air passage 1 and air passage 2 that has been heated in first condenser 2c joins together on the downwind side of first condenser 2c, flows to fan 5, and is then discharged from housing 9.

[0080] In the air conditioning device 500, the air flowing in from the second suction port 102 is preferentially guided to the region of the first condenser 2c where the superheated gas flows by the second shielding member 8. Note that the air conditioning device 500 is preferably configured so that an air path is formed by the flow of the air flowing in from the second suction port 102, so that refrigerant does not stagnate within the housing 9.

[0081] 16 is a diagram showing an air conditioning apparatus 500A according to a modification of Embodiment 5. Air conditioning apparatus 500A differs from air conditioning apparatus 500 in that a first shielding member 7C extending in the depth direction is arranged between first condenser 2c and the second space instead of second shielding member 8. Air conditioning apparatus 500A also differs from air conditioning apparatus 500 in that a first shielding member 7C extending in the depth direction is arranged between the first space and housing 9.

[0082] In the air conditioning device 500A, the first shielding members 7, 7, the evaporator 4, and the second condenser 2b are integrally configured, and the first shielding members 7C, 7C and the first condenser 2c are integrally configured.

[0083] 17 is a diagram showing a first shielding member 7 according to a modification of embodiment 5. As shown in the modification, a prevention member 10 for preventing air leakage may be disposed between the first condenser 2c and the end of the first shielding member 7. This makes it possible to fill the gap between the first condenser 2c and the first shielding member 7.

[0084] In the air conditioning devices 500 and 500A, the condenser 2 is divided into a first condenser 2c and a second condenser 2b in the depth direction of the housing 9. The first condenser 2c is disposed across the first and second spaces. In the first condenser 2c, the refrigerant that flows is primarily in a superheated gas state or a two-phase state and is discharged from the compressor 1. In the second condenser 2b, the refrigerant that flows is primarily in a two-phase state or a supercooled state and has dissipated heat in the first condenser 2c. In the air conditioning devices 500 and 500A, by exchanging heat with the refrigerant that is particularly in a superheated gas state and is discharged from the compressor 1 in the first condenser 2c, it is possible to preferentially dissipate heat from areas with a large temperature difference with the air.

[0085] In the air conditioning apparatus 500, 500A, the arrangement of the second shielding member 8 and the first shielding member 7C allows air to flow preferentially to the region of the first condenser 2c where the refrigerant in a superheated gas state flows. This allows the air velocity to be increased for the same air volume, improving the heat transfer performance outside the tube of the first condenser 2c.

[0086] In the air conditioning apparatuses 500 and 500A, because the first condenser 2c is expanded in the width direction, the total heat transfer area of ​​the first condenser 2c and the second condenser 2b can be expanded without changing the performance of the evaporator 4. Increasing the total heat transfer area of ​​the first condenser 2c and the second condenser 2b can further improve heat transfer performance. This can reduce the condensation temperature of the first condenser 2c. Improving the heat transfer performance of the first condenser 2c can reduce the compression ratio and power consumption.

[0087] Note that if the evaporator 4 is enlarged in the width direction, the dehumidification capacity may decrease due to an increase in the evaporation temperature of the evaporator 4. Furthermore, if the number of condensers 2 is increased in the column direction, the total heat transfer area increases, but the temperature difference between the air and the refrigerant decreases as the number of condensers 2 is increased in the column direction, so the contribution to improving heat transfer performance is small. For this reason, a configuration like that of the air conditioning apparatus 500, 500A of embodiment 5 is preferable.

[0088] By using the first condenser 2c as a flat tube heat exchanger and the second condenser 2b as a fin and tube type heat exchanger, even if condensation water generated in the evaporator 4 is scattered, it can be captured and vaporized in the second condenser 2b, and it is possible to suppress or prevent condensation water from adhering to and corroding the thin flat tubes.

[0089] Embodiment 6 Fig. 18 is a diagram showing an air conditioning apparatus 600 according to embodiment 6. The air conditioning apparatus 600 differs from the air conditioning apparatus 300 of embodiment 3 in that it is provided with a detection device 11 and an alarm unit 12.

[0090] The detection device 11 detects refrigerant leakage. The detection device 11 is disposed in an area S where a plurality of brazed portions 6 are arranged. The detection device 11 is disposed in the area S, particularly near a penetration provided in the first shielding member 7, which is an air passage. The detection device 11 is connected to an external power source (such as an outlet) not shown.

[0091] The alarm unit 12 alerts the user of a refrigerant leak by sound from the air conditioning device 600. The alarm unit 12 may be attached to an electronic device such as a personal computer or smartphone, or may use a combination of multiple notification methods. The alert from the alarm unit 12 may continue until the user cancels the alert.

[0092] 19 is a diagram showing an air conditioning apparatus 600A according to a modification of Embodiment 6. Air conditioning apparatus 600A differs from air conditioning apparatus 600 in that it does not include second shielding member 8, and that the length of first shielding member 7A disposed between the first space and the second space is longer in the depth direction, and that the length of first shielding member 7B between the first space and the housing 9 is longer in the depth direction.

[0093] A through-hole is formed in the first shielding member 7A between the condenser 2 and the evaporator 4. A through-hole is formed in the first shielding member 7B between the condenser 2 and the evaporator 4. Air that flows into the air passage 3 formed in the third space passes through the through-hole provided in the first shielding member 7B and flows from the third space to the first space. In the air conditioning device 600A, a detection device 11 is arranged near the through-hole in the first shielding member 7A, and a detection device 11 is arranged near the through-hole in the first shielding member 7B.

[0094] FIG. 20 is a diagram showing the arrangement of the detection device 11 according to the sixth embodiment. The detection device 11 is arranged near the through-hole 7d, which is provided at a low position in the height direction of the first shielding member 7. The detection device 11 is arranged at the lowest position of the through-hole 7d. The arrangement of the detection device 11 enables early detection of a refrigerant leak. The detection device 11 may be arranged at a position where the refrigerant concentration is highest, based on actual measurements or the results of a refrigerant leak simulation. This allows early detection of a refrigerant leak in a location where the concentration is likely to increase during a refrigerant leak.

[0095] Next, the control executed by the control device 60 will be described. Fig. 21 is a flowchart showing the processing executed in the air conditioning device 600 according to Embodiment 6. The processing of the flowchart in Fig. 21 is repeatedly called and executed as a subroutine from the main routine in the control of the control device 60. The air conditioning device 600 is, as a premise, connected to an external power source (such as an outlet) not shown.

[0096] First, in step S (hereinafter simply referred to as "S") 100, the control device 60 operates at least the detection device 11 and the fan 5 using a power source, regardless of whether the air conditioning device 600 is operating or stopped. For example, the control device 60 operates the detection device 11 continuously or at set time intervals, regardless of whether the air conditioning device 600 is operating while connected to an external power source. The control device 60 prioritizes operation commands for the fan 5 when the air conditioning device 600 is operating. When the air conditioning device 600 is stopped, the control device 60 operates the fan 5 continuously or at set time intervals. The operation states of the detection device 11 and the fan 5 may be the same or may be set separately. For example, the detection value of the detection device 11 may be set in stages, and the operation state of the fan 5 may be changed depending on the stage of the refrigerant leakage.

[0097] Next, the control device 60 determines whether the value of the detection device 11 is equal to or greater than a predetermined value (S101). The predetermined value is, for example, a refrigerant concentration that is a predetermined criterion for refrigerant leakage. If the control device 60 determines that the value of the detection device 11 is less than the predetermined value (NO in S101), the control device 60 returns the process from the subroutine to the main routine. If the control device 60 determines that the value of the detection device 11 is equal to or greater than the predetermined value (YES in S101), the control device 60 notifies the alarm unit 12 of a refrigerant leakage and continuously operates the fan 5 at a predetermined rotation speed (S102). Note that the predetermined rotation speed in S102 may be the maximum rotation speed at which the airflow rate is maximized, or may be a rotation speed corresponding to the airflow rate required to ensure safety determined through analysis, experiment, or the like.

[0098] Next, the control device 60 determines whether the value of the detection device 11 is less than a specified value and whether the user has completed the countermeasure (S103). The countermeasure completion process may be, for example, a process of pressing a physical button to stop the sound of the alarm unit 12, or a process of operating an electronic device to complete the ventilation operation. The control device 60 may determine whether the countermeasure completion process has been completed by linking with a ventilation device in the space where the air conditioning device 600 is installed.

[0099] If the value of the detection device 11 is equal to or greater than the specified value or the user has not completed the countermeasure (NO in S103), the control device 60 returns to S102 and continues issuing an alarm and operating the fan 5. If the value of the detection device 11 is less than the specified value and the user has completed the countermeasure (YES in S103), the control device 60 stops the alarm issuing unit 12 from issuing an alarm and stops the fan 5 (S104), and returns the process from the subroutine to the main routine.

[0100] The air conditioning units 600 and 600A are equipped with a detection device 11 and an alarm unit 12, which not only suppresses the formation of flammable areas but also detects refrigerant leakage above a specified value and notifies the user early, thereby improving reliability.

[0101] The detection device 11 is disposed in the region S where the brazed portions 6 are arranged, thereby enabling early detection of refrigerant leakage. The detection device 11 is disposed near the penetration portion 7d of the first shielding member 7 through which the leaked refrigerant flows when the fan 5 is operating, thereby improving the accuracy of refrigerant detection. The detection device 11 is disposed at the lowest position of the penetration portion 7d, thereby enabling early detection of an increase in concentration due to refrigerant accumulation.

[0102] The air conditioning apparatus 600, 600A operates the detection device 11 regardless of whether it is operating for air conditioning while connected to an external power source (such as an outlet). This makes it possible to detect refrigerant leaks regardless of the operating state of the air conditioning. Because the fan 5 operates along with the detection device 11, the air conditioning apparatus 600, 600A can detect refrigerant leaks while suppressing the formation of a flammable region both when the apparatus is operating and when it is stopped, regardless of whether it is operating for air conditioning while connected to an external power source.

[0103] Air conditioners 600, 600A can alert the user to a refrigerant leak by sound or the like from alarm unit 12. When alarm unit 12 is attached to an electronic device such as a personal computer or smartphone, it can reliably determine which air conditioner among multiple air conditioners is causing the leak.

[0104] Seventh Embodiment Fig. 22 is a diagram showing an air conditioning apparatus 700 according to a seventh embodiment. The air conditioning apparatus 700 differs from the air conditioning apparatus 600 of the sixth embodiment in that it is provided with a battery 13.

[0105] The battery 13 is capable of supplying power to the detection device 11 and the fan 5. The battery 13 is disposed in a position within the housing 9 of the air conditioning device 700 that does not interfere with the flow of air from the first air inlet 101 and the second air inlet 102. This makes it possible to suppress or prevent the formation of a flammable region, as in the other embodiments.

[0106] When the air conditioning device 700 is not connected to an external power source (such as an outlet), the battery 13 operates to supply power to the detection device 11 and the fan 5. When connected to an external power source, the battery 13 is charged by the external power source. When connected to an external power source, the control device 60 uses power supplied from the external power source in priority over power supplied from the battery 13.

[0107] Next, the control executed by the control device 60 will be described. Fig. 23 is a flowchart showing the processing executed in the air conditioning device 700 according to Embodiment 7. The processing of the flowchart in Fig. 23 is repeatedly called and executed as a subroutine from the main routine in the control of the control device 60. The air conditioning device 700 is configured so that some of the devices are operated by the battery 13 when it is not connected to an external power source (such as an outlet) not shown.

[0108] First, in S201, the control device 60 determines whether or not the air conditioning device 700 is connected to a power source. If the air conditioning device 700 is connected to a power source (YES in S201), the control device 60 proceeds to processing in S202. If the air conditioning device 700 is not connected to a power source (NO in S201), the control device 60 proceeds to processing in S205.

[0109] In S202, when the control device 60 is connected to a power source, it operates at least the detection device 11 and the fan 5 using the power source, regardless of whether the air conditioning device 700 is operating or stopped. For example, the control device 60 operates the detection device 11 continuously or at set time intervals, regardless of whether the air conditioning device 700 is operating while connected to an external power source. The control device 60 prioritizes operation commands for the fan 5 when the air conditioning device 600 is operating. The control device 60 operates the fan 5 continuously or at set time intervals when the air conditioning device 600 is stopped. The operation states of the detection device 11 and the fan 5 may be the same or may be set separately. For example, the detection value of the detection device 11 may be set in stages, and the operation state of the fan 5 may be changed depending on the stage of the refrigerant leakage.

[0110] Next, the control device 60 checks the remaining charge of the battery 13 and determines whether charging of the battery 13 is necessary (S203). For example, if a fully charged state of the battery 13 is defined as 100%, the control device 60 may determine that charging is unnecessary if the remaining charge is 90% or more. If the control device 60 determines in S203 that charging of the battery 13 is necessary (YES in S203), the control device 60 charges the battery 13 (S204) and proceeds to the process of S207. If the control device 60 determines in S203 that charging of the battery 13 is not necessary (NO in S203), the control device 60 proceeds to the process of S207 without charging the battery 13. Note that the control device 60 prioritizes the operation of each element of the refrigeration cycle even during the charging operation in S204 (for example, charging the battery 13 while performing a dehumidification operation).

[0111] In S207, the control device 60 determines whether the value of the detection device 11 is equal to or greater than a specified value. The specified value is, for example, a predetermined refrigerant concentration that is a criterion for determining whether a refrigerant leak has occurred. If the control device 60 determines that the value of the detection device 11 is less than the specified value (NO in S207), the control device 60 returns the process from the subroutine to the main routine. If the control device 60 determines that the value of the detection device 11 is equal to or greater than the specified value (YES in S207), the control device 60 notifies the alarm unit 12 of a refrigerant leak and continuously operates the fan 5 at a specified rotation speed (S208). Note that the specified rotation speed in S208 may be the maximum rotation speed at which the airflow rate is maximized, or may be a rotation speed corresponding to the airflow rate required to ensure safety determined through analysis, experiment, or the like.

[0112] Next, the control device 60 determines whether the value of the detection device 11 is less than a specified value and whether the user has completed the countermeasure (S209). The countermeasure completion process may be, for example, a process of pressing a physical button to stop the sound of the alarm unit 12, or a process of operating an electronic device to complete the ventilation operation. The control device 60 may determine whether the countermeasure completion process has been completed by linking with a ventilation device in the space where the air conditioning device 600 is installed.

[0113] If the value of the detection device 11 is equal to or greater than the specified value or the user has not completed the countermeasure (NO in S209), the control device 60 returns to S208 and continues issuing an alarm and operating the fan 5. If the value of the detection device 11 is less than the specified value and the user has completed the countermeasure (YES in S209), the control device 60 stops the alarm issuing unit 12 from issuing an alarm and stops the fan 5 (S210), and returns the process from the subroutine to the main routine.

[0114] If the air conditioning device 700 is not connected to a power source (NO in S201), in the processing of S205, the control device 60 operates at least the detection device 11 using the battery 13 and operates the fan 5 at a lower rotation speed than when power is supplied. Next, the control device 60 determines whether the remaining charge of the battery 13 is equal to or greater than a threshold value (S206).

[0115] If the control device 60 determines in S206 that the remaining charge of the battery 13 is equal to or greater than the threshold (YES in S206), the process proceeds to S207. If the control device 60 determines in S206 that the remaining charge of the battery 13 is less than the threshold (NO in S206), the process proceeds to S211. For example, if a fully charged state is 100%, the threshold for the remaining charge of the battery 13 is preferably set to between 5% and 25% in order to avoid frequent notifications of low battery charge and to enable notifications of low battery charge for a certain period of time.

[0116] If the remaining charge of the battery 13 is less than the threshold, the control device 60 causes the alarm unit 12 to notify the user of the insufficient battery charge in S211. Next, the control device 60 determines whether the air conditioning device 700 is connected to a power source (S212). If the air conditioning device 700 is not connected to a power source (NO in S212), the control device 60 returns to S211 and causes the alarm unit 12 to continue issuing an alarm until the air conditioning device 700 is connected to a power source. If the air conditioning device 700 is connected to a power source (YES in S212), the control device 60 returns the process from the subroutine to the main routine.

[0117] The air conditioning device 700 is equipped with the battery 13, and is therefore able to detect refrigerant leakage even when not connected to an external power source. As shown in S201 and S202, the air conditioning device 700 prioritizes the supply of power from the power source when it is connected to the power source, and is therefore able to prevent the battery 13 from running out of charge when it is not connected to the power source.

[0118] As shown in S205, the air conditioning apparatus 700 operates at least the detection device 11 using the battery 13, and is therefore able to detect refrigerant leakage even when not connected to a power source. As shown in S205, when using the battery 13, the air conditioning apparatus 700 operates the fan 5 at a lower rotation speed than when power is supplied, and is therefore able to discharge leaked refrigerant to the outside while reducing power consumption of the battery 13. This allows the operating time of the battery 13 to be extended.

[0119] Embodiment 8 Fig. 24 is a diagram showing an air conditioning apparatus 800 according to embodiment 8. The air conditioning apparatus 800 differs from the air conditioning apparatus 100 of embodiment 1 in that it is provided with a temperature sensor 14 and a pressure sensor 15.

[0120] The temperature sensor 14 is disposed near the first suction port 101 and measures the temperature of the outside air. The temperature sensor 14 may be disposed in another location where the temperature of the outside air can be measured, such as near the second suction port 102. The pressure sensor 15 measures the temperature converted into pressure on the refrigerant discharge side of the compressor 1. The pressure sensor 15 may be disposed at any position in the refrigerant circuit, or may be disposed at multiple locations. The pressure sensor 15 is preferably disposed on the discharge side or suction side of the compressor 1.

[0121] The control device 60 determines whether a refrigerant leak has occurred by determining whether the absolute value of the difference between the measurement value of the temperature sensor 14 and the saturated gas temperature calculated based on the measurement value of the pressure sensor 15 is equal to or greater than a preset second threshold. By determining the presence or absence of refrigerant before starting operation, the air conditioning device 800 prevents operation from being started in a state where no refrigerant is present due to a slight leakage of refrigerant (also called a slow leak) when the air conditioning device 800 is stopped. A specific method for determining a refrigerant leak will be described using FIG. 25 .

[0122] Fig. 25 is a diagram for explaining refrigerant leakage determination according to the eighth embodiment. In Fig. 25, the horizontal axis represents time and the vertical axis represents temperature. When the refrigerant is properly charged, the saturated gas temperature T15 calculated based on the measurement value of the discharge side (high-pressure side) by the pressure sensor 15 during operation is higher than the outside air temperature T14 (Area A). On the other hand, when the refrigerant is properly charged, the saturated gas temperature T15 calculated based on the measurement value of the suction side (low-pressure side) by the pressure sensor 15 during operation is lower than the outside air temperature T14.

[0123] After operation is stopped and a certain time has elapsed, the pressure in the refrigerant circuit becomes uniform (also called a pressure-equalizing state) (region B). In the pressure-equalizing state, the absolute value of the difference between the measurement value of the temperature sensor 14 and the saturated gas temperature becomes approximately equal. This value is set as the second threshold. If a slow leak occurs while operation is stopped, after a certain amount of refrigerant leaks, the measurement value of the pressure sensor 15 eventually drops to atmospheric pressure (region C).

[0124] When a slow leak occurs, even if the measured value of temperature sensor 14 is 20°C, the saturated gas temperature of the refrigerant at atmospheric pressure is, for example, -52°C for R32, resulting in a large difference in the absolute value of the difference. When a large difference occurs, where the absolute value of the difference is equal to or greater than a predetermined second threshold, control device 60 determines that refrigerant has leaked.

[0125] By providing the temperature sensor 14 and the pressure sensor 15, the air conditioning device 800 can determine whether a refrigerant leak has occurred before starting operation, even if a slow leak occurs while the device is not operating. This prevents the air conditioning device 800 from starting operation when there is no refrigerant present, thereby preventing the occurrence of breakdowns in the compressor 1.

[0126] The air conditioning apparatus 800 may be configured to include the detection device 11, alarm unit 12, and battery 13 shown in embodiment 7. In such a case, the air conditioning apparatus 800 may notify the user of the occurrence of a slow leak via the alarm unit 12. Even if a malfunction of the detection device 11 or alarm unit 12 occurs, or the remaining charge of the battery 13 is insufficient, the air conditioning apparatus 800 can determine whether a refrigerant leak has occurred before starting operation, thereby improving safety.

[0127] Summary The air conditioning apparatus 100 of the present disclosure includes a refrigerant circuit configured to circulate a refrigerant, and a housing 9 that houses the refrigerant circuit. The refrigerant circuit includes a compressor 1, a condenser 2, an expansion device (expansion valve 3), an evaporator 4, and a fan 5. The compressor 1, the condenser 2, the expansion device (expansion valve 3), and the evaporator 4 are connected by a plurality of pipes brazed at at least one brazed portion 6. The condenser 2 and the evaporator 4 are disposed in a first space within the interior space of the housing 9. The compressor 1, the expansion device (expansion valve 3), and the at least one brazed portion 6 are disposed in a second space within the interior space. The housing 9 is formed with a first air inlet 101 through which air drawn in from the outside by the fan 5 flows into the first space, and a second air inlet 102 through which air drawn in from the outside by the fan 5 flows into the second space.

[0128] According to the above configuration, in the air conditioning device 100, air drawn in by the fan 5 passes through the first space and the second space separately. The first space is free of at least one brazed portion 6, and the air passes through the condenser 2 and the evaporator 4. At least one brazed portion 6 is concentrated in the second space, and the air passes through the compressor 1, the expansion device (expansion valve 3), and at least one brazed portion 6. As a result, the air conditioning device 100 concentrates at least one brazed portion 6, which is prone to refrigerant leakage, in the second space, while air is introduced into the second space by the fan 5, thereby preventing refrigerant from accumulating in the isolated space in the event of a refrigerant leak. In this way, the air conditioning device 100 can improve reliability by suppressing the formation of a flammable region within the housing 9.

[0129] Preferably, the width of the first air inlet 101 is greater than the width of the second air inlet 102. With the above configuration, the air volume in the first space in which the condenser 2 and the evaporator 4 that contribute to heat exchange are disposed can be made greater than the air volume in the second space that does not contribute to heat exchange. This makes it possible to suppress the inflow of excess air into the second space that does not contribute to heat exchange.

[0130] Preferably, the amount of air flowing into the first air inlet 101 is greater than the amount of air flowing into the second air inlet 102 .

[0131] According to the above configuration, the air volume in the first space where the condenser 2 and the evaporator 4 that contribute to heat exchange are disposed can be made larger than the air volume in the second space that does not contribute to heat exchange, thereby suppressing the inflow of excess air into the second space that does not contribute to heat exchange.

[0132] Preferably, a third suction port is formed on the opposite side of the first suction port 101 from the second suction port 102 relative to the width of the housing 9, and the width of the third suction port is equal to or less than the width of the second suction port 102.

[0133] According to the above configuration, the flow of air sucked in from the third suction port can prevent the leaked refrigerant from stagnating when the refrigerant leaks from a location corresponding to the third suction port.

[0134] Preferably, the amount of air flowing into the third air inlet is equal to or less than the amount of air flowing into the second air inlet.

[0135] According to the above configuration, it is possible to suppress the inflow of excess air into spaces that do not contribute to heat exchange.

[0136] Preferably, air drawn into the housing 9 by driving the fan 5 flows through a first air passage (air passage 1) passing through the first space and a second air passage (air passage 2) passing through the second space. The fan 5 is disposed on the downwind side of where the first air passage (air passage 1) and the second air passage (air passage 2) converge. The air conditioner further includes a first shielding member 7 disposed between the first space and the second space, and a second shielding member 8 disposed between the second space and the fan 5. The second shielding member 8 is formed with a through-hole 8a that allows air flowing in from the second air inlet 102 to pass from the second space toward the fan 5.

[0137] According to the above configuration, the direction of the air flow in the second space can be set arbitrarily by arranging the second air inlet 102 and the through-hole 8a.

[0138] Preferably, the through portion 8 a is located at a position lower than the second air inlet 102 in the height direction of the housing 9 .

[0139] According to the above configuration, when a refrigerant that is heavier than air leaks, the refrigerant can be allowed to flow out of the through-hole 8 a together with air while minimizing refrigerant accumulation. By minimizing refrigerant accumulation when a leak occurs, the formation of a flammable region can be suppressed or prevented, thereby improving reliability.

[0140] Preferably, a preventing member 10 for preventing air leakage between the inner surface of the housing 9 and the second shielding member 8 is further provided.

[0141] The above configuration can suppress airflow from unintended locations. In other words, the preventing member 10 can increase the air volume (wind speed) to the intended location. This can suppress the formation of a flammable area due to the increased air volume (wind speed).

[0142] Preferably, air drawn into the housing 9 by driving the fan 5 flows through a first air passage (air passage 1) passing through the first space and a second air passage (air passage 2) passing through the second space. The fan 5 is disposed on the downwind side of where the first air passage (air passage 1) and the second air passage (air passage 2) converge. The air conditioner further includes a first shielding member 7 disposed between the first space and the second space. The first shielding member 7 is formed with a through-hole 7a that allows air flowing in from the second air inlet 102 to pass from the second space toward the first space between the condenser 2 and the evaporator 4.

[0143] According to the above configuration, air that has passed through the through-hole 7a from the second space passes through the first space between the condenser 2 and the evaporator 4. This prevents a flammable region from being formed inside the housing 9, and increases the amount of air passing through the condenser 2 while maintaining the amount of air passing through the evaporator 4, thereby improving the heat transfer performance on the condensation side and reducing the condensing temperature of the refrigeration cycle.

[0144] Preferably, the condenser 2 includes a first condenser 2 a disposed on the downwind side in the first space and a second condenser 2 b disposed on the upwind side, and a through-hole is formed between the first condenser 2 a and the second condenser 2 b.

[0145] According to the above configuration, the air undergoing heat exchange in the second condenser 2b, which may become supercooled, can be heat exchanged with air cooled by the evaporator 4, thereby increasing the temperature difference and improving the heat exchange performance.

[0146] Preferably, the condenser 2 includes a first condenser 2c disposed on the downwind side of the first space and a second condenser 2b disposed on the upwind side. The first condenser 2c is disposed across the first and second spaces. Air flowing in from the first air inlet 101 exchanges heat with the first condenser 2c and the second condenser 2b. Air flowing in from the second air inlet 102 exchanges heat with the first condenser 2c.

[0147] According to the above configuration, in the first condenser 2c, heat is exchanged with the refrigerant, particularly in a superheated gas state, discharged from the compressor 1, so that heat can be preferentially released from an area where the temperature difference with the air is large.

[0148] Preferably, the system further includes a control device 60 and a detection device 11 that detects refrigerant leakage. The control device 60 operates the detection device 11 regardless of whether the system is operating for air conditioning while connected to an external power source.

[0149] According to the above configuration, refrigerant leakage can be detected regardless of the operating state of the air conditioning system.

[0150] Preferably, the device further includes a battery 13 capable of supplying power to the detection device 11 and the fan 5. The control device 60 operates the battery 13 when not connected to an external power source.

[0151] According to the above configuration, it is possible to detect refrigerant leakage even when the device is not connected to an external power source.

[0152] Preferably, the battery 13 is charged by an external power source. When the control device 60 is connected to an external power source, the control device 60 uses the power supplied from the external power source in preference to the power supplied from the battery 13.

[0153] According to the above configuration, it is possible to prevent the remaining charge of the battery 13 from running low when the power source is not connected.

[0154] Preferably, when the control device 60 is not connected to an external power source, the control device 60 controls the fan 5 to rotate at a lower speed than when the fan 5 is energized.

[0155] According to the above configuration, the leaked refrigerant can be discharged to the outside while suppressing the power consumption of the battery 13 .

[0156] Preferably, the device further includes a notification device (alert unit 12) that notifies the user when the remaining charge of the battery 13 falls below the first threshold.

[0157] According to the above configuration, it is possible to prevent frequent notifications of a low remaining battery charge and to enable notifications of a low remaining battery charge for a certain period of time.

[0158] Preferably, the compressor further includes a temperature sensor 14 that measures the external temperature and a pressure sensor 15 that measures the pressure on the refrigerant discharge side of the compressor 1. The control device 60 determines whether or not a refrigerant leak has occurred by determining whether or not the absolute value of the difference between the measurement value of the temperature sensor 14 and the saturated gas temperature calculated based on the measurement value of the pressure sensor 15 is equal to or greater than a second threshold value.

[0159] According to the above configuration, even if a slow leak occurs during a shutdown, it is possible to determine whether or not a refrigerant leak has occurred before the start of operation.

[0160] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims.

[0161] REFERENCE SIGNS LIST 1 Compressor, 2 Condenser, 2a, 2c First condenser, 2b Second condenser, 3 Expansion valve, 4 Evaporator, 5 Fan, 7, 7A, 7B, 7C First shielding member, 7a, 7b, 7c, 7d, 8a, 8c Penetration portion, 8 Second shielding member, 8b, 8d, 8e Fixing portion, 9 Housing, 10 Prevention member, 11 Detection device, 12 Alarm unit, 13 Battery, 14 Temperature sensor, 15 Pressure sensor, 21 Hairpin portion, 22 U-vent portion, 60 Control device, 61 Control unit, 62 Memory unit, 100, 100A, 200, 300, 300A, 300B, 400, 400A, 500, 500A, 600, 600A, 700, 800 Air conditioning device, 101 First intake port, 102 second intake port.

Claims

1. A refrigerant circuit configured to circulate the refrigerant, The system comprises a housing that accommodates the refrigerant circuit, The refrigerant circuit comprises a compressor, a condenser, an expansion device, an evaporator, and a fan. The compressor, the condenser, the expansion device, and the evaporator are connected by a plurality of pipes brazed at at least one brazed joint. The condenser and the evaporator are arranged in a first space within the internal space of the housing. The compressor, the expansion device, and the at least one brazed joint are arranged in the second space of the internal space, The housing is provided with a first intake port for allowing air drawn in from the outside by the fan to flow into the first space, and a second intake port for allowing air drawn in from the outside by the fan to flow into the second space. An air conditioning device in which a third intake port is formed on the opposite side of the second intake port, with respect to the width of the housing, and the width of the third intake port is less than or equal to the width of the second intake port.

2. The air conditioning device according to claim 1, wherein the width of the first intake port is greater than the width of the second intake port.

3. The air conditioning device according to claim 1 or claim 2, wherein the amount of air flowing into the first intake port is greater than the amount of air flowing into the second intake port.

4. The air conditioning device according to claim 1, wherein the amount of air flowing into the third intake port is equal to or less than the amount of air flowing into the second intake port.

5. A refrigerant circuit configured to circulate a refrigerant, The system comprises a housing that accommodates the refrigerant circuit, The refrigerant circuit comprises a compressor, a condenser, an expansion device, an evaporator, and a fan. The compressor, the condenser, the expansion device, and the evaporator are connected by a plurality of pipes brazed at at least one brazed joint. The condenser and the evaporator are arranged in a first space within the internal space of the housing. The compressor, the expansion device, and the at least one brazed joint are arranged in the second space of the internal space, The housing is provided with a first intake port for allowing air drawn in from the outside by the fan to flow into the first space, and a second intake port for allowing air drawn in from the outside by the fan to flow into the second space. When the fan is driven, the air drawn into the housing flows through a first air passage passing through the first space and a second air passage passing through the second space. The fan is positioned on the leeward side where the first air passage and the second air passage merge. A first shielding member is disposed between the first space and the second space, The system further comprises a second shielding member disposed between the second space and the fan, The second shielding member has a first penetration portion formed therein that allows air flowing in from the second intake port to pass from the second space toward the fan. The first penetration portion is located at a lower position than the second intake port in the height direction of the housing of the air conditioning device.

6. The air conditioning device according to claim 5, further comprising a prevention member for preventing air leakage between the inner surface of the housing and the second shielding member.

7. A refrigerant circuit configured to circulate a refrigerant, The system comprises a housing that accommodates the refrigerant circuit, The refrigerant circuit comprises a compressor, a condenser, an expansion device, an evaporator, and a fan. The compressor, the condenser, the expansion device, and the evaporator are connected by a plurality of pipes brazed at at least one brazed joint. The condenser and the evaporator are arranged in a first space within the internal space of the housing. The compressor, the expansion device, and the at least one brazed joint are arranged in the second space of the internal space, The housing is provided with a first intake port for allowing air drawn in from the outside by the fan to flow into the first space, and a second intake port for allowing air drawn in from the outside by the fan to flow into the second space. When the fan is driven, the air drawn into the housing flows through a first air passage passing through the first space and a second air passage passing through the second space. The fan is positioned on the leeward side where the first air passage and the second air passage merge. The system further comprises a first shielding member positioned between the first space and the second space, An air conditioning system wherein the first shielding member has a second penetration portion formed therein that allows air flowing in from the second intake port to pass from the second space toward the first space between the condenser and the evaporator.

8. The condenser includes a first condenser located downwind in the first space and a second condenser located upwind. The air conditioning device according to claim 7, wherein the second through-hole is formed between the first condenser and the second condenser.

9. A refrigerant circuit configured to circulate a refrigerant, The system comprises a housing that accommodates the refrigerant circuit, The refrigerant circuit comprises a compressor, a condenser, an expansion device, an evaporator, and a fan. The compressor, the condenser, the expansion device, and the evaporator are connected by a plurality of pipes brazed at at least one brazed joint. The condenser and the evaporator are arranged in a first space within the internal space of the housing. The compressor, the expansion device, and the at least one brazed joint are arranged in the second space of the internal space, The housing is provided with a first intake port for allowing air drawn in from the outside by the fan to flow into the first space, and a second intake port for allowing air drawn in from the outside by the fan to flow into the second space. The condenser includes a first condenser located downwind in the first space and a second condenser located upwind. The first condenser is positioned to span from the first space to the second space, The air flowing in from the first intake port is subjected to heat exchange with the first condenser and the second condenser. An air conditioning system in which air flowing in from the second intake port is heat-exchanged with the first condenser.

10. Control device and It is further equipped with a detection device for detecting refrigerant leaks, The air conditioning device according to claim 5, wherein the detection device is located near the first shielding member or a penetration formed in the second shielding member in the second space.

11. The air conditioning system according to claim 10, wherein the control device operates the detection device regardless of whether or not it is operating for air conditioning while connected to an external power source.

12. The detection device and the fan are further equipped with a battery capable of supplying power to them. The air conditioning system according to claim 11, wherein the control device operates the battery when it is not connected to the external power supply.

13. The aforementioned battery is charged by the external power supply, The air conditioning device according to claim 12, wherein, when the control device is connected to the external power supply, it preferentially uses the power supplied from the external power supply over the power supplied from the battery.

14. The air conditioning device according to claim 12, wherein the control device, when not connected to the external power supply, sets the fan to a lower rotational speed than when powered on.

15. The air conditioning device according to any one of claims 12 to 14, further comprising a notification device that notifies the user when the remaining charge of the battery falls below a first threshold.

16. A temperature sensor for measuring the external temperature, The compressor further comprises a pressure sensor for measuring the pressure on the refrigerant discharge side, The control device determines whether or not refrigerant has leaked by determining whether or not the absolute value of the difference between the measurement value of the temperature sensor and the saturated gas temperature calculated based on the measurement value of the pressure sensor is greater than or equal to a second threshold, the air conditioning device according to any one of claims 12 to 14.