Refrigerant recovery device and refrigerated transport vehicle equipped with same

Abstract

To provide a refrigeration recovery device capable of effectively recovering leaked refrigerant from a storage, and a refrigeration vehicle for transportation comprising the refrigerant recovery device.SOLUTION: A refrigerant recovery device 20 comprises: a first pipe 21 that conveys fluid containing a refrigerant present in a storage of a refrigeration vehicle for transportation comprising a refrigeration unit for transportation; a compressor 23 that compresses the fluid guided from the first pipe 21; a condenser 24 that condenses the refrigerant contained in the fluid guided from the compressor 23; and a gas-liquid separator 25 that separates the fluid guided from the condenser 24 into gas and liquid.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a refrigerant recovery device and a transport refrigerated vehicle equipped with the same. [Background technology]

[0002] 2. Description of the Related Art Conventionally, storage facilities such as warehouses and transport containers for freezing and refrigerating food and the like are provided with refrigeration systems equipped with refrigerant circuits in which refrigerant circulates to perform a refrigeration cycle in order to cool the interior of the storage facility.

[0003] Patent Document 1 discloses a CA device having a recovery tank for recovering leaked refrigerant. Specifically, the CA device is configured such that a CA controller detects whether or not refrigerant is leaking inside a storage container, and when refrigerant is leaking, causes the CA device to perform a refrigerant discharge operation, thereby controlling the opening and closing of an air pump and each control valve, and the refrigerant leaked inside the container is compressed together with the air inside the container, and then discharged outside the container and recovered in a recovery tank. The CA device also operates to recover the refrigerant leaked from the refrigerant circuit in the recovery tank, thereby safely discharging the refrigerant leaked inside the container from inside the container. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-101342 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, as described above, in a transport refrigeration unit using a slightly flammable refrigerant with a low global warming potential (GWP value), if the refrigerant leaks into an airtight truck compartment, a flammable space is formed inside the compartment. Therefore, if there is an ignition source inside or outside the compartment during transportation or handling, there is a risk of fire. In addition, if the refrigerant leaks into the compartment, the refrigerant is released into the atmosphere when the door is opened during unloading, so even if the refrigerant has a low impact on the environment, it will have an impact on the environment that promotes global warming.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide a refrigerant recovery device that can effectively recover leaked refrigerant from a storage facility, and a transport refrigerated vehicle equipped with the same. [Means for solving the problem]

[0007] The present disclosure one The refrigerant recovery device according to the embodiment includes: Has a condensing unit a first pipe for transporting a fluid containing a refrigerant present in a storage compartment of a transport refrigeration vehicle equipped with a transport refrigeration unit, a compressor for compressing the fluid guided from the first pipe, a condenser for condensing the refrigerant contained in the fluid guided from the compressor, and a gas-liquid separator for separating the fluid guided from the condenser into gas and liquid; a pressure vessel that accommodates the liquid refrigerant separated by the gas-liquid separator; a liquid refrigerant supply pipe for supplying the liquid refrigerant stored in the pressure vessel to the condensing unit; and a control unit that controls the supply of the liquid refrigerant to the condensing unit in accordance with a remaining amount of the liquid refrigerant in the condensing unit. It is equipped with: Effect of the Invention

[0008] According to the present disclosure, refrigerant that has leaked into a storage compartment can be effectively recovered. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a side view showing an outline of a transport refrigeration vehicle according to an embodiment of the present disclosure. [Diagram 2] 1 is a diagram showing a configuration of a refrigerant recovery device according to a first embodiment. FIG. [Diagram 3] 4 is a flowchart showing an example of a procedure of a refrigerant recovery process according to the first embodiment. [Figure 4]4 is a flowchart showing an example of a procedure of a refrigerant recovery process according to the first embodiment. [Diagram 5] FIG. 11 is a side view showing an outline of a refrigerated transport vehicle according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Configuration of transport refrigeration unit] Fig. 1 shows a schematic configuration of a transport refrigerated vehicle 1 according to an embodiment of the present disclosure. The transport refrigerated vehicle 1 includes a tractor (vehicle body) 10 and a transport refrigeration unit 11 (indicated by a dashed line in Fig. 1) connected to the rear of the tractor 10. The transport refrigeration unit 11 also includes a storage (refrigerated container) 12, an evaporator unit 13, a condensing unit 14, a leakage detection means 15, and a refrigerant recovery device 20. A refrigeration cycle is formed by connecting the evaporator unit 13 and the condensing unit 14 with refrigerant piping (not shown).

[0011] The storage shed 12 is a sealable container that is loaded onto the bed of a transport vehicle and used to store transported goods. The storage shed 12 is provided with an evaporator unit 13 and a leak detection means 15. The air inside the storage shed 12 is cooled by heat exchange between the evaporator (not shown) of the evaporator unit 13 and the air inside the storage shed 12.

[0012] The evaporator unit 13 accommodates a fan (not shown), an expansion valve (not shown) that throttles the refrigerant, an evaporator that evaporates the refrigerant guided from the expansion valve, and the like within a case. The evaporator is, for example, a heat exchanger having a heat transfer tube through which the refrigerant flows and fins attached to the heat transfer tube. The refrigerant evaporates in the evaporator, thereby removing heat from the air inside the refrigerator and cooling the air inside the refrigerator.

[0013] The condensing unit 14 has an outer shell formed by a box-shaped case fixed to the chassis of the transport refrigerated vehicle 1, and the case houses a fan (not shown), a compressor (not shown) that compresses the refrigerant, a condenser that condenses the high-temperature, high-pressure refrigerant sent from the compressor, a motor (not shown) that drives the compressor, and / or an engine (not shown). The condenser is, for example, a heat exchanger having a heat transfer tube through which the refrigerant flows and fins attached to the heat transfer tube. The refrigerant condenses in the condenser, dissipating heat to the outside air.

[0014] The refrigerant circulating through the evaporator unit 13 and the condensing unit 14 is a slightly flammable refrigerant. Here, the slightly flammable refrigerant refers to a refrigerant that exhibits weak flammability among flammable refrigerants.

[0015] Specific examples of mildly flammable refrigerants include R32, a refrigerant based on HFC (hydrofluorocarbon), and R1234yf and R1234ze, which are refrigerants based on HFO (hydrofluoroolefin). Mildly flammable refrigerants are not limited to the above substances, but also include refrigerants classified as SubCLASS2L in the international standard ISO817 and refrigerants classified as SubCLASS2L in the standard ASHRAE34 by the American Society of Heating, Refrigeration and Air-Conditioning Engineers.

[0016] The leakage detection means 15 detects whether or not a refrigerant is leaking into the storage cabinet 12. Specifically, as an example, when the concentration of the refrigerant in the storage cabinet 12 is greater than a predetermined amount, the leakage detection means 15 detects that a refrigerant is leaking into the storage cabinet 12. Specifically, the leakage detection means 15 is a leakage sensor. Note that the leakage detection means 15 may be any means capable of detecting the leakage of the refrigerant, and may be any of a mechanical, electrical, or optical type.

[0017] [Configuration of refrigerant recovery equipment] 2 is a diagram showing a configuration of a refrigerant recovery device 20 according to the first embodiment of the present disclosure. The refrigerant recovery device 20 includes a first pipe 21, an on-off valve 22a, a compressor 23, a condenser 24, and a gas-liquid separator 25. When a refrigerant leaks into the storage 12, the refrigerant recovery device 20 recovers a fluid containing the refrigerant present in the storage 12 in addition to the air in the storage 12. The position at which the refrigerant recovery device 20 is installed is not limited to the position shown in FIG. 1, and may be changed as appropriate as long as the refrigerant recovery device 20 can be installed in the transport refrigerated vehicle 1.

[0018] One opening of the first pipe 21 is connected to the storage 12 loaded on the transport refrigerated vehicle 1, and is connected to the gas-liquid separator 25 via a compressor 23 and a condenser 24. In addition, the fluid containing the refrigerant leaked into the storage 12 and recovered in the refrigerant recovery device 20 is transported to the gas-liquid separator 25 via the first pipe 21, the compressor 23, and the condenser 24.

[0019] The on-off valve 22a is provided on the first pipe 21, and by switching between opening and closing of the on-off valve 22a, whether or not the refrigerant is transported into the first pipe 21 is switched.

[0020] The compressor 23 compresses the fluid containing the refrigerant guided from the first pipe 21 to increase the temperature and pressure of the fluid, and then discharges the fluid containing the refrigerant at a high temperature and high pressure to the condenser 24. Note that, although a scroll compressor, a rotary compressor, or the like is mainly used as the compressor 23, the type of the compressor 23 is not limited thereto.

[0021] The condenser 24 condenses the refrigerant by exchanging heat between the fluid containing the refrigerant discharged from the compressor 23 and the outside air. By condensing the refrigerant contained in the fluid, the state of the refrigerant changes and a liquid refrigerant LR is generated. Note that, in the present embodiment, the method of heat exchange is exemplified by air-cooling heat exchange, but is not limited thereto.

[0022] The gas-liquid separator 25 separates the fluid transported from the condenser 24 into gas and liquid refrigerant LR. The gas separated by the gas-liquid separator 25 is transported through the second pipe 27 and the on-off valve 22b into the storage 12. The liquid refrigerant LR separated by the gas-liquid separator 25 is transported through the third pipe 28 and the on-off valve 22c to the pressure vessel 29. The gas-liquid separator 25 may be any type capable of separating the fluid into gas and liquid refrigerant LR, and may be any type such as a static separation type, a distillation separation type, a centrifugal separation type, or an adsorption separation type.

[0023] The on-off valve 22b is provided on the second pipe 27. The control unit 26 switches the on-off valve 22b between open and closed, whereby the gas is conveyed into the second pipe 27 or not.

[0024] The third pipe 28 is connected to the gas-liquid separator 25 and the pressure vessel 29, and the liquid refrigerant LR separated by the gas-liquid separator 25 is transported to the pressure vessel 29 via the third pipe 28.

[0025] The on-off valve 22c is provided on the third pipe 28. The control unit 26 switches between opening and closing the on-off valve 22c, thereby switching whether the liquid refrigerant LR is transported into the third pipe 28 or not.

[0026] The pressure vessel 29 stores the liquid refrigerant LR transported from the gas-liquid separator 25 via the third piping 28. The pressure vessel 29 is not limited to a sealed vessel, and may be any vessel capable of storing the liquid refrigerant LR at a constant pressure.

[0027] The control unit 26 switches the operation of the refrigerant recovery device 20 and controls the operations of the leakage detection means 15, the compressor 23, and the condenser 24. The control unit 26 is a computer system, and includes, for example, a CPU, a ROM (Read Only Memory) for storing programs executed by the CPU, a RAM (Random Access Memory) that functions as a work area when each program is executed, a hard disk drive (HDD) as a large-capacity storage device, and a communication unit for connecting to a network, etc. Note that a solid-state drive (SSD) may be used as the large-capacity storage device. These units are connected via a bus.

[0028] The control unit 26 may also include an input unit consisting of a keyboard, a mouse, etc., and a display unit consisting of a liquid crystal display device or the like for displaying data.

[0029] The storage medium for storing the programs executed by the CPU is not limited to the ROM, but may be, for example, another auxiliary storage device such as a magnetic disk, a magneto-optical disk, or a semiconductor memory.

[0030] The program is recorded in a hard disk drive or the like in the form of a program, and the CPU reads this program into RAM or the like and executes information processing and arithmetic processing to realize various functions described below. The program may be pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication means. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories.

[0031] [Operation flow of refrigerant recovery device] Next, an example of a refrigerant recovery process executed by the control unit 26 controlling the refrigerant recovery device 20 will be described. Figures 3 and 4 are flow charts showing an example of the procedure of the refrigerant recovery process according to this embodiment. The following refrigerant recovery process is started, for example, at the timing when the leakage detection means 15 detects that a refrigerant is leaking into the storage 12.

[0032] First, the leakage detection means 15 provided in the storage 12 detects whether or not a refrigerant is leaking into the storage 12 (S101). As a result, if the leakage detection means 15 does not detect that a refrigerant is leaking into the storage 12 (S101: NO), the process of S101 is repeated until the leakage detection means 15 detects that a refrigerant is leaking into the storage 12.

[0033] Furthermore, when the leakage detection means 15 detects that the refrigerant is leaking into the storage 12 (S101: YES), the control unit 26 opens the on-off valves 22a, 22b, and 22c (S102) and starts the compressor 23, the condenser 24, and the gas-liquid separator 25. As a result, the fluid containing the refrigerant leaked into the storage 12 is guided to the compressor 23 via the first piping 21.

[0034] Next, the compressor 23 compresses the fluid containing the refrigerant guided to the compressor 23, increasing the temperature and pressure of the fluid (S103). Then, the fluid containing the refrigerant having a high temperature and high pressure is discharged from the compressor 23 to the condenser 24.

[0035] Next, the condenser 24 condenses the refrigerant discharged from the compressor 23 and containing the high-temperature and high-pressure refrigerant by exchanging heat with the outside air, and changes the state of the refrigerant contained in the fluid to a liquid refrigerant LR (S104). Then, the fluid containing the liquid refrigerant LR is transported to the gas-liquid separator 25.

[0036] The gas-liquid separator 25 separates the fluid transported from the condenser 24 into gas and liquid refrigerant LR (S105). Then, the gas separated by the gas-liquid separator 25 is transported into the storage 12 via the second piping 27 (S106). Also, the liquid refrigerant LR separated by the gas-liquid separator 25 is transported to the pressure vessel 29 via the third piping 28 (S107). Also, the liquid refrigerant LR transported to the pressure vessel 29 is stored inside the pressure vessel 29.

[0037] Next, when a series of processes (S101: YES to S107) is completed, the detection result of the leakage detection means 15 is checked again (S108).

[0038] If the leakage detection means 15 detects that a refrigerant is leaking into the storage 12 (S108: YES), the refrigerant recovery device 20 continues the processes of S103 to S107. If the leakage detection means 15 does not detect that a refrigerant is leaking into the storage 12 (S108: NO), the control unit 26 closes the on-off valves 22a, 22b, and 22c (S109), and stops the compressor 23, the condenser 24, and the gas-liquid separator 25.

[0039] As described above, by recovering the fluid containing the refrigerant inside storage 12, the concentration of the refrigerant inside storage 12 of transport refrigeration unit 11 can be reduced, thereby reducing the risk of fire. Also, it is possible to reduce environmental pollution to the external environment when the door of storage 12 of transport refrigeration unit 11 is opened with the refrigerant leaking inside and the refrigerant flows out into the atmosphere. Furthermore, since only the refrigerant can be separated from the recovered fluid, the recovered refrigerant can be reused.

[0040] Although the present disclosure has been described above using the embodiments, the technical scope of the present disclosure is not limited to the scope described in the above embodiments. Various modifications or improvements can be made to the above embodiments without departing from the gist of the invention, and the forms in which such modifications or improvements are made are also included in the technical scope of the present disclosure. In addition, the above embodiments may be appropriately combined. Furthermore, the process flow described in the above embodiment is also an example, and unnecessary steps may be deleted, new steps may be added, or the process order may be rearranged, without departing from the spirit of the present disclosure.

[0041] [Second embodiment] In the first embodiment, the refrigerant recovery device 20 is provided on the transport refrigerated vehicle 1, and when the leakage detection means 15 detects a refrigerant leakage in the storage 12, the refrigerant recovery device 20 is activated by the control unit 26, so that refrigerant recovery can be performed automatically. In this embodiment, the refrigerant recovery device 20 is not provided on the transport refrigerated vehicle 1, but is characterized in that it is attachable to and detachable from the transport refrigerated vehicle 1. Specifically, the refrigerant recovery device 20 is installed or removed by the driver or a serviceman when the engine of the transport refrigerated vehicle 1 is stopped. Other configurations provided on the transport refrigerated vehicle 1 are the same as those in the first embodiment.

[0042] The refrigerant recovery device 20 in this embodiment is detachable from the transport refrigerated vehicle 1, and is not attached to the transport refrigerated vehicle 1 when the transport refrigerated vehicle 1 is traveling. In addition, when the transport refrigerated vehicle 1 is stopped and the leakage detection means 15 detects that a refrigerant is leaking into the storage bay 12, the refrigerant recovery device 20 is installed in the transport refrigerated vehicle 1 by the driver or a serviceman.

[0043] The refrigerant recovery device 20 installed in the transport refrigerated vehicle 1 is activated by the driver or a serviceman to recover fluid containing refrigerant that has leaked into the storage compartment 12.

[0044] When the operation of the refrigerant recovery device 20 no longer detects refrigerant leakage in the storage facility 12, the driver or service technician stops the refrigerant recovery device 20 and removes it from the transport refrigerated vehicle 1.

[0045] From the above, the driver or serviceman can determine whether or not to install or remove the refrigerant recovery device 20 and recover the refrigerant inside the storage bay 12 when the engine of the transport refrigerated vehicle 1 is stopped. This allows the leaked refrigerant inside the storage bay 12 to be appropriately recovered, taking into account the external environment of the transport refrigerated vehicle 1, etc.

[0046] [Third embodiment] The refrigerant recovery device 20 in this embodiment is a refrigerant recovery device 20 that is capable of supplying the liquid refrigerant LR stored in the pressure vessel 29 to the condensing unit 14. Fig. 5 is a diagram showing an example of a transport refrigerated vehicle 1 according to a third embodiment. The transport refrigerated vehicle 1 shown in Fig. 5 is characterized in that the condensing unit 14 and the refrigerant recovery device 20 are connected by a fourth piping 30. Other configurations of the transport refrigerated vehicle 1 are the same as those of the first embodiment.

[0047] The condensing unit 14 in this embodiment includes a remaining amount detection means 31 that detects the remaining amount of refrigerant in the condensing unit 14. The remaining amount detection means 31 is, for example, a level sensor that detects the remaining amount of liquid refrigerant LR inside the condensing unit 14.

[0048] The control unit 26 drives a pump (not shown) for transporting the liquid refrigerant based on the detection result of the remaining amount detection means 31. Here, instead of driving the pump, the liquid refrigerant LR may be transported by switching the open / close state of an on-off valve (not shown) provided in the fourth piping 30.

[0049] As a result, the control unit 26 drives the pump and on-off valve for transporting the refrigerant based on the detection result of the remaining amount detection means 31, and the liquid refrigerant LR stored in the pressure vessel 29 is supplied to the condensing unit 14 via the fourth piping 30.

[0050] In addition, the supply of liquid refrigerant LR from the pressure vessel 29 to the condensing unit 14 is continued for a certain period of time, or the control unit 26 stops the pump based on the detection result of the remaining amount detection means 31, thereby stopping the supply of liquid refrigerant LR from the pressure vessel 29 to the condensing unit 14.

[0051] Furthermore, the on-off valve provided on the fourth piping 30 may be an expansion valve (not shown) for depressurizing the pressurized liquid refrigerant in the pressure vessel. The liquid refrigerant LR is depressurized by the expansion valve, and is transported to the condensing unit 14 in a state that is easy to evaporate. Note that the mechanism for depressurizing the liquid refrigerant LR is not limited to this example, and other methods may be used.

[0052] As described above, the refrigerant recovery device 20 recovers the refrigerant that has leaked into the storage 12, and supplies the liquid refrigerant LR stored in the pressure vessel 29 to the condensing unit 14. Therefore, even if the refrigerant continues to leak into the storage 12, the refrigerant will not run out inside the evaporator unit 13 and the condensing unit 14, so that a low-temperature atmosphere can be maintained inside the storage 12 even when the transported goods are transported for a long period of time.

[0053] The refrigerant recovery device and the transport refrigeration vehicle equipped with the same according to the present disclosure described above can be understood, for example, as follows. The refrigerant recovery device (20) of the present disclosure includes a first pipe (21) that transports a fluid containing a refrigerant present in a storage facility (12) of a transport refrigeration vehicle (1) equipped with a transport refrigeration unit (11), a compressor (23) that compresses the fluid guided from the first pipe, a condenser (24) that condenses the refrigerant contained in the fluid guided from the compressor, and a gas-liquid separator (25) that separates the fluid guided from the condenser into gas and liquid.

[0054] According to the refrigerant recovery device of the present disclosure, in the event of a refrigerant leak, the refrigerant recovery device recovers the fluid in the storage of the refrigeration unit using the first pipe, and compresses the fluid guided from the first pipe by the compressor. The pressurized fluid is then condensed in the condenser, and the condensed fluid is separated into gas and liquid refrigerant by the gas-liquid separator. In this way, by recovering the fluid containing the refrigerant in the storage, it is possible to reduce the concentration of the refrigerant in the storage of the transport refrigeration unit. In addition, it is possible to reduce environmental pollution to the external environment when the door of the storage of the transport refrigeration unit is opened with the refrigerant leaking into the storage and the refrigerant flows out into the atmosphere. Furthermore, since only the refrigerant can be separated from the recovered fluid, the recovered refrigerant can be reused.

[0055] The refrigerant recovery apparatus according to the present disclosure includes a second pipe (27) that transports the gas separated by the gas-liquid separator into the storage facility.

[0056] In the refrigerant recovery device according to the present disclosure, the gas separated by the gas-liquid separator is transported into the storage chamber via the second pipe connected to the gas-liquid separator. This allows the refrigerant that could not be recovered in one gas-liquid separation to be returned to the storage chamber together with the gas and recovered again, so that the refrigerant recovery and gas-liquid separation can be repeated to further reduce the refrigerant concentration in the storage chamber.

[0057] The refrigerant recovery apparatus according to the present disclosure includes a pressure vessel (29) that contains the liquid refrigerant separated by the gas-liquid separator.

[0058] According to the refrigerant recovery device of the present disclosure, the liquid refrigerant separated by the gas-liquid separator is transported to the pressure vessel. This allows only the liquid refrigerant after gas-liquid separation to be stored in the pressure vessel, so the state of the refrigerant can be preserved for a long period of time, making it easier to manage the refrigerant. In addition, the refrigerant can be reused.

[0059] The refrigerant recovery device according to the present disclosure includes a refrigerant leak detector (15) that detects leakage of refrigerant inside a storage facility.

[0060] According to the refrigerant recovery device of the present disclosure, the refrigerant leak detector detects a refrigerant leak in the storage container. This allows refrigerant recovery to be performed only when a refrigerant leak occurs in the storage container, and the refrigerant recovery device can be driven only when refrigerant recovery is required. This reduces the energy required to drive the refrigerant recovery device. This allows refrigerant recovery to be performed only when a refrigerant leak occurs inside the storage facility, so the refrigerant recovery device can be driven only when refrigerant recovery is required, thereby reducing the energy required to drive the refrigerant recovery device. [Explanation of symbols]

[0061] 1: Refrigerated transport vehicle 10: Tractor 11: Transport refrigeration unit 12: Storage 13: Evaporator unit 14: Condensing unit 15: Leak detection means 20: Refrigerant recovery device 21:First piping 22a, 22b, 22c: Opening and closing valves 23: Compressor 24: Condenser 25: Gas-liquid separator 26: Control section 27:Second piping 28:Third piping 29: Pressure vessels LR: Liquid refrigerant

Claims

1. A first pipe for conveying a fluid containing a refrigerant present in a storage compartment of a transport refrigeration vehicle equipped with a transport refrigeration unit having a condensing unit; a compressor that compresses the fluid guided from the first piping; a condenser for condensing a refrigerant contained in the fluid guided from the compressor; a gas-liquid separator that separates the fluid guided from the condenser into gas and liquid; a pressure vessel for accommodating the liquid refrigerant separated by the gas-liquid separator; a liquid refrigerant supply pipe for supplying the liquid refrigerant stored in the pressure vessel to the condensing unit; a control unit that controls the supply of liquid refrigerant to the condensing unit according to a remaining amount of liquid refrigerant in the condensing unit; A refrigerant recovery device comprising:

2. An expansion valve provided in the liquid refrigerant supply pipe, The refrigerant recovery device according to claim 1 , wherein the control unit controls the expansion valve in accordance with a remaining amount of liquid refrigerant in the condensing unit.

3. The refrigerant recovery apparatus according to claim 1 , further comprising a second pipe for transporting the gas separated by the gas-liquid separator into the storage tank.

4. The refrigerant recovery device according to any one of claims 1 to 3, further comprising a refrigerant leakage detector that detects leakage of the refrigerant in the storage compartment.

5. A refrigerated transport vehicle equipped with the refrigerant recovery device according to any one of claims 1 to 4.

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