Refrigeration cycle device, monitoring system, and container

Abstract

A refrigeration cycle device (20) comprises a compressor (40), a DC power supply (88) that outputs a DC voltage, and a conduction component (90) that electrically connects the DC power supply and a casing (41) of the compressor. Provided on an outer surface of the casing are an insulation film (46) and a conductive film (47) that is laminated on the insulation film. The conduction component is provided with a first terminal electrode (91) which is connected to the casing and a second terminal electrode (94) which is connected to the conductive film. The DC power supply applies a DC voltage between the first terminal electrode and the second terminal electrode, with the first terminal electrode as a negative electrode and the second terminal electrode as a positive electrode.

Description

Refrigeration cycle device, monitoring system, and container

[0001] The present disclosure relates to a refrigeration cycle device, a monitoring system, and a container.

[0002] Containers used for marine transportation have been known for some time. These containers are equipped with a refrigeration cycle system for cooling the interior space of the container body. The refrigeration cycle system includes a refrigerant circuit. The refrigerant circuit includes a compressor, an external heat exchanger, an expansion valve, and an internal heat exchanger, and performs a vapor compression refrigeration cycle by circulating a refrigerant.

[0003] In the refrigeration cycle device, the external heat exchanger functions as a radiator that radiates heat from the refrigerant inside the container by heat exchange with the air outside the container, and the internal heat exchanger functions as an evaporator that evaporates the refrigerant inside the container by heat exchange with the air inside the container and cools the air inside the container. An example of such a refrigeration cycle device is disclosed in Patent Document 1.

[0004] JP 2011-257087 A

[0005] Metal components exposed to the outside air, such as compressor casings in refrigeration cycle devices, are coated with an exterior coating. However, if the exterior coating peels off due to deterioration or other defects, water such as rainwater, seawater, and condensation water can penetrate the defective area and adhere to the metal components, causing corrosion. Transportation containers are loaded onto ships and other vessels and transported at sea. Therefore, in the above cases, metal components are particularly susceptible to corrosion due to the effects of seawater.

[0006] An object of the present disclosure is to suppress corrosion of metallic target components included in a refrigeration cycle device.

[0007] A first aspect of the present disclosure relates to a refrigeration cycle apparatus (20). The refrigeration cycle apparatus (20) of the first aspect includes a target part (TP) made of metal, a DC power supply (88) that outputs a DC voltage, and an energized part (90) that electrically connects the target part (TP) to the DC power supply (88). An insulating film (46) and a conductive film (47) laminated on the insulating film (46) are provided on an outer surface of the target part (TP). The energized part (90) includes a first terminal electrode (91) connected to the target part (TP) and a second terminal electrode (94) connected to the conductive film (47). The DC power supply (88) applies the DC voltage between the first terminal electrode (91) and the second terminal electrode (94), with the first terminal electrode (91) serving as a cathode and the second terminal electrode (94) serving as an anode.

[0008] In this first aspect, the current-carrying component (90) applies a DC voltage output from a DC power supply (88) between the first terminal electrode (91) and the second terminal electrode (94). At this time, the DC voltage is applied with the first terminal electrode (91) serving as a cathode and the second terminal electrode (94) serving as an anode. Therefore, when water adheres to a defect in the insulating film (46), for example, and conducts electricity between the target component (TP) and the conductive film (47), a current corresponding to the DC voltage flows through the target component (TP) and the conductive film (47), thereby providing cathodic protection to the target component (TP). This suppresses corrosion of the target component (TP).

[0009] A second aspect of the present disclosure is the refrigeration cycle apparatus (20) of the first aspect, further comprising an electrical component box (70) that houses electrical components (EP). The DC power supply (88) is disposed in the electrical component box (70).

[0010] In the second embodiment, the DC power supply (88) is arranged in the electrical component box (70), which eliminates the need for extra space for providing the DC power supply (88).

[0011] A third aspect of the present disclosure is a refrigeration cycle apparatus (20) according to the second aspect, further comprising a refrigerant circuit (60) that circulates a refrigerant to perform a refrigeration cycle. The refrigerant circuit (60) includes a compressor (40). The electrical component box (70) accommodates an inverter board (80) for driving a motor (40M) of the compressor (40). The DC power supply (88) is provided on the inverter board (80).

[0012] In the third aspect, the DC power supply (88) is provided on an inverter board (80) for driving the motor (40M) of the compressor (40). This allows the power supplied to the inverter board (80) to be used for the DC power supply (88). This allows a mechanism for supplying power to the DC power supply (88) to be realized with a simple configuration.

[0013] A fourth aspect of the present disclosure is the refrigeration cycle apparatus (20) of any one of the first to third aspects, further comprising a load device (PD) operated by DC current. The current-carrying component (90) includes a first power supply line (110) connecting the first terminal electrode (91) and the second terminal electrode (94) to the DC power supply (88). The DC power supply (88) has a first power supply port (89a) and a second power supply port (89b) that output DC voltages, respectively. The first power supply line (110) is connected to the first power supply port (89a). A second power supply line (130) for operating the load device (PD) is connected to the second power supply port (89b).

[0014] In the fourth aspect, the DC power supply (88) is also used as a power supply for operating the load devices (PD) other than the current-carrying component (90). This allows cathodic protection of the target part (TP) to be performed using the DC power supply (88) for operating the load devices (PD). This reduces costs compared to when the DC power supply (88) for cathodic protection is provided separately from the power supply for the load devices (PD).

[0015] A fifth aspect of the present disclosure is the refrigeration cycle apparatus (20) of any one of the first to fourth aspects, wherein the first terminal electrode (91) and the second terminal electrode (94) are integrated with an insulator (97) therebetween to form a composite electrode component (CP). The insulator (97) is a hollow rod-like object with both ends open, and penetrates the conductive film (47) in the longitudinal direction. The first terminal electrode (91) is disposed inside the insulator (97). The second terminal electrode (94) is located on the outer periphery of the insulator (97).

[0016] In the fifth aspect, a composite electrode part (CP) is used in which a first terminal electrode (91) and a second terminal electrode (94) are integrated via an insulator (97). The insulator (97) is a hollow rod-like object with both ends open, and penetrates the conductive film (47) in the longitudinal direction. The first terminal electrode (91) is disposed inside the insulator (97). This allows the first terminal electrode (91) to be connected to the target part (TP) while being insulated from the second terminal electrode (94) and the conductive film (47). The second terminal electrode (94) is located on the outer periphery of the insulator (97). This allows the second terminal electrode (94) to be connected to the conductive film (47) while being insulated from the first terminal electrode (91). Furthermore, the use of such a composite electrode part (CP) reduces the space required to provide the first terminal electrode (91) and the second terminal electrode (94). Furthermore, since the first terminal electrode (91) and the second terminal electrode (94) can be handled as a single unit, the number of steps required for attaching the first terminal electrode (91) and the second terminal electrode (94) can be reduced.

[0017] A sixth aspect of the present disclosure is the refrigeration cycle apparatus (20) of any one of the first to fifth aspects, wherein the target part (TP) is fastened to another part (26) by a fastening member (50). The fastening member (50) is inserted into a region of the target part (TP) where no conductive film (47) is present.

[0018] In the sixth aspect, the fastening member (50) is inserted into a region of the target part (TP) that does not have the conductive film (47), thereby preventing electrical conduction between the target part (TP) and the conductive film (47) through the fastening member (50).

[0019] A seventh aspect of the present disclosure is the refrigeration cycle apparatus (20) of any one of the first to sixth aspects, further comprising a refrigerant circuit (60) that circulates a refrigerant to perform a refrigeration cycle. The refrigerant circuit (60) includes a compressor (40). The target part (TP) is a casing (41) of the compressor (40).

[0020] In the seventh aspect, the target part (TP) is the casing (41) of the compressor (40). The exterior coating (45) of the casing (41) of the compressor (40) is subjected to stress due to temperature changes from the inside of the compressor (40) as well as temperature changes in the external environment, and deteriorates over time. Therefore, there is a concern that deterioration of the exterior coating (45) will accelerate corrosion of the casing (41). The external power supply type cathodic protection technique according to the present disclosure is effective in suppressing such corrosion of the casing (41).

[0021] An eighth aspect of the present disclosure is the refrigeration cycle apparatus (20) of any one of the first to seventh aspects, further comprising a control unit (140) that controls execution of a refrigeration cycle. The control unit (140) monitors whether a current corresponding to the DC voltage flows through the target part (TP) and the conductive film (47).

[0022] In the eighth aspect, the control unit (140) monitors whether a current corresponding to the DC voltage output from the DC power supply flows between the target part (TP) and the conductive film (47). According to this, when the control unit (140) detects that a current flows through the target part (TP) and the conductive film (47), it notifies a user, a maintenance company, a service company, a dealer, an administrator, or the like, so that the target part (TP) can be repaired, replaced, or otherwise handled before a malfunction occurs.

[0023] A ninth aspect of the present disclosure is the refrigeration cycle apparatus (20) of the eighth aspect, further comprising a storage device (74) for storing data, wherein the control unit (140) causes the storage device (74) to store data indicating the current flowing through the target part (TP) and the conductive film (47).

[0024] In the ninth aspect, the control unit (140) stores data indicating the current flowing through the target part (TP) and the conductive film (47) in the storage device (74). This allows a user, a maintenance company, a service company, a sales company, a manager, or the like to read the data stored in the storage device (74) and check the presence or absence and history of current flow related to cathodic protection of the target part (TP).

[0025] A tenth aspect of the present disclosure is the refrigeration cycle apparatus (20) of the eighth aspect, further comprising a communication device (75) for communicating with other devices. The control unit (140) stores data indicating the target part (TP) and the current flowing through the conductive film (47) in a server device (300) on a network (N) via the communication device (75).

[0026] In the tenth aspect, the control unit (140) stores data indicating the current flowing through the target part (TP) and the conductive film (47) in a server device (300) on the network (N) via the communication device (75). This allows a user, a maintenance company, a service company, a sales company, an administrator, or the like to access the server device (300) and check the presence or absence of current flow related to cathodic protection in the target part (TP) and its history.

[0027] An eleventh aspect of the present disclosure is directed to a monitoring system (400). The monitoring system (400) of the eleventh aspect includes a plurality of refrigeration cycle apparatuses (20) according to any one of the first to tenth aspects, and a monitoring device (410) configured to be able to communicate with the plurality of refrigeration cycle apparatuses (20). The refrigeration cycle apparatus (20) includes a communication device (75) for communicating with other devices, and transmits data indicating a current flowing between the target part (TP) and the conductive film (47) to the monitoring device (410) via the communication device (75). The monitoring device (410) monitors the flow of the current through the target part (TP) in the refrigeration cycle apparatus (20) based on the data received from the refrigeration cycle apparatus (20).

[0028] In the eleventh aspect, the monitoring device (410) is configured to be able to communicate with the plurality of refrigeration cycle devices (20) and monitors the flow of current to the target parts (TP) of each of the refrigeration cycle devices (20). This makes it possible to remotely and collectively grasp the energization states of the target parts (TP) of the plurality of refrigeration cycle devices (20). Then, depending on the energization state of each of the target parts (TP), it is possible to take action such as repair or replacement before the target parts (TP) malfunction.

[0029] A twelfth aspect of the present disclosure is directed to a container (10). The container (10) of the twelfth aspect includes the refrigeration cycle device (20) of any one of the first to tenth aspects and a container body (11) in which the refrigeration cycle device (20) is provided. The container (10) is used for marine transportation.

[0030] In this twelfth aspect, a container (10) used for marine transportation includes the refrigeration cycle apparatus (20) according to any one of the first to tenth aspects. In such a container (10), if an exterior coating film (45) applied to a metal target part (TP) included in the refrigeration cycle apparatus (20) deteriorates and peels off, causing a defect, the target part (TP) is susceptible to corrosion due to the influence of seawater. The external power supply type cathodic protection technique according to the present disclosure is effective in suppressing corrosion of such a metal target part (TP).

[0031] FIG. 1 is a longitudinal cross-sectional view of a refrigeration cycle apparatus according to an embodiment, taken along a front-rear direction. FIG. 2 is a perspective view of the refrigeration cycle apparatus as seen from the front. FIG. 3 is a piping diagram of the refrigeration cycle apparatus. FIG. 4 is a block diagram showing main components of the refrigeration cycle apparatus. FIG. 5 is an electrical circuit diagram showing an electrical control system of the refrigeration cycle apparatus. FIG. 6 is a cross-sectional view showing a composite electrode component provided in a compressor casing and its surrounding configuration. FIG. 7 is a cross-sectional view showing essential parts of a leg portion of the compressor casing. FIG. 8 is a block diagram showing a refrigeration cycle apparatus according to a first modified example. FIG. 9 is a diagram showing an example of the hardware configuration of a server device. FIG. 10 is a block diagram showing the overall configuration of a monitoring system according to a second modified example. FIG. 11 is a diagram showing an example of the hardware configuration of a monitoring device.

[0032] Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. The present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical concept of the present disclosure. Since the drawings are intended to conceptually explain the present disclosure, the dimensions, ratios, and numbers may be exaggerated or simplified to facilitate understanding.

[0033] <<Embodiment>> (1) Overall Configuration of Container A container (10) of this embodiment will be described with reference to Figs. 1 to 4. In the following description, terms such as "front," "rear," "left," "right," "upper," and "lower" refer to the directions indicated by the arrows in Fig. 2. The interior space (13) of the container body (11) may be referred to as the "interior," and the space outside the container body (11) may be referred to as the "outside."

[0034] The container (10) is used for marine transportation. The container (10) is a refrigeration container having a function of cooling the air inside the container (10). The container (10) includes a container body (11) and a refrigeration cycle device (20). As shown in FIG. 2 , an opening (12) is formed in the front surface of the container body (11). The refrigeration cycle device (20) is attached to the container body (11) so as to close the opening (12) of the container body (11). The refrigeration cycle device (20) cools an interior space (13) of the container body (11).

[0035] (2) Refrigeration Cycle Device As shown in Figures 1 and 2, the refrigeration cycle device (20) includes a first casing (21). The first casing (21) forms a lid for the opening (12) of the container body (11). The first casing (21) includes a casing body (22) and a partition plate (23). The casing body (22) separates the inside and outside of the container body (11). The partition plate (23) is arranged on the back side (rear side) of the first casing (21) so as to be located in the interior space (13).

[0036] The refrigeration cycle apparatus (20) includes, as elements arranged outside the compartment, a compressor (40), an external heat exchanger (56), and an external fan (57). The refrigeration cycle apparatus (20) includes, as elements arranged inside the compartment, an internal heat exchanger (58) and an internal fan (59).

[0037] (2-1) Casing Body As shown in FIGS. 1 and 2, the casing body (22) has a flat plate portion (24) and a recessed portion (25). The flat plate portion (24) is formed on the upper part of the casing body (22) so as to be substantially flush with the opening (12) of the first casing (21). As shown in FIG. 2, two inspection windows (28) are formed in the middle of the flat plate portion (24) in the left-right direction. The inspection windows (28) are transparent windows for checking the inside of the casing body (22). A ventilator (29) is provided to the left of the inspection windows (28). The ventilator (29) ventilates the inside of the storage compartment.

[0038] The recess (25) is formed in the lower part of the first casing (21). The recess (25) is recessed rearward from the lower end of the flat plate portion (24). An external storage space (30) is formed in front of the recess (25). An internal storage space (31) is formed above the recess (25) and between the flat plate portion (24) and the partition plate (23). The lower end of the recess (25) forms a bottom plate (26). The bottom plate (26) extends to both ends of the casing body (22) in the left-right direction. The casing body (22) includes an outer wall member (32), a heat insulating layer (33), and an inner wall member (34).

[0039] The outer wall member (32), the heat insulating layer (33), and the inner wall member (34) are stacked in the thickness direction (front-rear direction) of the casing body (22). The outer wall member (32) faces the outside of the refrigerator, and the inner wall member (34) faces the inside of the refrigerator. The heat insulating layer (33) is provided between the outer wall member (32) and the inner wall member (34). The outer wall member (32) is made of, for example, an aluminum material. The inner wall member (34) is made of, for example, a fiber-reinforced plastic (FRP). The heat insulating layer (33) is made of, for example, a foamed resin.

[0040] (2-2) Partition Plate and Air Passageway As shown in FIG. 1 , the partition plate (23) is a plate-like member located on the rear side of the recessed portion (25). The partition plate (23) is disposed at a predetermined distance from the rear surface of the recessed portion (25) and extends in the vertical direction. An internal passageway (35) through which internal air flows is formed between the casing body (22) and the partition plate (23). An inlet port (36) is formed between the upper end of the partition plate (23) and the upper wall of the container body (11). The inlet port (36) connects the inlet end of the internal passageway (35) to the internal space (13). An outlet port (37) is formed between the lower end of the partition plate (23) and the lower wall (11b) of the container body (11). The outlet port (37) connects the outlet end of the internal passageway (35) to the internal space (13).

[0041] (2-3) External Components As shown in FIG. 1, the external storage space (30) is provided with a compressor (40), an external heat exchanger (56), and an external fan (57).

[0042] The compressor (40) is installed on the bottom plate (26) of the first casing (21). The compressor (40) is disposed toward the bottom of the internal storage space (31). The compressor (40) is disposed toward the right of the external storage space (30). An accumulator (64), not shown in FIG. 2, is also installed on the bottom plate (26). The compressor (40) is configured so that the volume of the refrigerant to be compressed can be changed by inverter control.

[0043] The compressor (40) includes a second casing (41), a motor (40M), and a compression mechanism. The second casing (41) accommodates the motor (40M) and the compression mechanism (not shown). The compression mechanism is driven by the motor (40M) and compresses the refrigerant. The compression mechanism is a scroll-type compression mechanism. The motor (40M) is a variable-speed motor driven by inverter control.

[0044] The external fan (57) is located near the upper part of the external storage space (30). The external fan (57) is, for example, a propeller fan. The external fan (57) has an impeller and a motor. The motor (40M) drives the impeller to rotate. As shown in FIG. 2 , an external passage (38) through which the outside air flows is formed behind the external fan (57).

[0045] The external heat exchanger (56) is provided in the external storage space (30) at a height position between the external fan (57) and the compressor (40). The external heat exchanger (56) is located in the external passage (38). The external heat exchanger (56) is, for example, a fin-and-tube heat exchanger.

[0046] (2-4) Inner Component Parts As shown in FIG. 1, an inner heat exchanger (58) and an inner fan (59) are provided in the inner storage space (31).

[0047] The internal heat exchanger (58) is provided in the internal storage space (31) so as to extend across the casing body (22) and the partition plate (23). The internal heat exchanger (58) is supported by the first casing (21) and is located in the internal passage (35). The internal heat exchanger (58) is, for example, a fin-and-tube heat exchanger.

[0048] The internal fan (59) is disposed in the internal passage (35) upstream of the internal heat exchanger (58). The internal fan (59) is located above the internal heat exchanger (58). The internal fan (59) is, for example, a propeller fan. The internal fan (59) has an impeller and a motor. The motor drives the impeller to rotate.

[0049] (2-5) Configuration of the Refrigerant Circuit As shown in Fig. 3, the refrigeration cycle apparatus (20) includes a refrigerant circuit (60). The refrigerant circuit (60) is filled with a refrigerant. The refrigerant circuit (60) performs a vapor compression refrigeration cycle by circulating the refrigerant. The refrigerant circuit (60) mainly includes a compressor (40), an external heat exchanger (56), an expansion valve (61), and an internal heat exchanger (58).

[0050] The compressor (40) compresses the sucked refrigerant. The compressor (40) discharges the compressed refrigerant. A discharge pipe (62) is connected to a discharge portion of the compressor (40). A suction pipe (63) is connected to a suction portion of the compressor (40). An accumulator (64) is provided in the suction pipe (63). The accumulator (64) is a container for storing liquid refrigerant.

[0051] The external heat exchanger (56) exchanges heat between the refrigerant flowing therethrough and the external air. The gas end of the external heat exchanger (56) communicates with the discharge pipe (62). The liquid end of the external heat exchanger (56) is connected to the liquid pipe (65). The external heat exchanger (56) functions as a radiator (condenser) that radiates heat from the refrigerant to the air.

[0052] The expansion valve (61) is provided in the liquid pipe (65). The expansion valve (61) reduces the pressure of high-pressure refrigerant to low-pressure refrigerant. The expansion valve (61) is an electronic expansion valve with an adjustable opening. A receiver (66) is provided in the liquid pipe (65) between the external heat exchanger (56) and the expansion valve (61). The receiver (66) is a container for storing excess refrigerant in the refrigerant circuit (60).

[0053] The internal heat exchanger (58) exchanges heat between the refrigerant flowing therethrough and the internal air. The gas end of the internal heat exchanger (58) communicates with the suction pipe (63). The liquid end of the internal heat exchanger (58) is connected to the expansion valve (61) via a liquid pipe (65). The internal heat exchanger (58) functions as an evaporator in which the refrigerant absorbs heat from the air.

[0054] The refrigerant circuit (60) has a bypass pipe (67). An inflow end of the bypass pipe (67) communicates with the discharge pipe (62). An outflow end of the bypass pipe (67) communicates with the liquid pipe (65). The bypass pipe (67) sends the refrigerant discharged from the compressor (40) to the internal heat exchanger (58), bypassing the external heat exchanger (56).

[0055] The refrigerant circuit (60) is provided with a first valve (68) and a second valve (69). The first valve (68) is provided between the discharge side of the compressor (40) and the gas end of the external heat exchanger (56), and downstream of the connection portion of the bypass pipe (67). The second valve (69) is provided in the bypass pipe (67). The first valve (68) and the second valve (69) are electromagnetic on-off valves. The first valve (68) and the second valve (69) may be flow control valves whose opening degrees are adjustable.

[0056] (2-6) Electrical Component Box As shown in FIG. 2, the refrigeration cycle apparatus (20) includes an electrical component box (70). The electrical component box (70) is provided in the first casing (21). The electrical component box (70) is disposed in the middle of the first casing (21) in the up-down direction. The electrical component box (70) includes a box body (71) and a lid (72). The front side of the box body (71) is open. The lid (72) is fixed to the box body (71) via a hinge (not shown) and is configured to be able to open and close the front opening of the box body (71).

[0057] A sealing member is provided between the box body (71) and the lid (72) to prevent the intrusion of water and air. The electrical component box (70) is made of a resin material. The electrical component box (70) accommodates electrical components. The electrical components include a control board (73), a storage device (74), a communication device (75), an inverter board (80), a reactor, a relay board, and other electronic devices.

[0058] (2-7) Control Board The refrigeration cycle apparatus (20) includes a control board (73). The control board (73) is a printed circuit board on which a control circuit for controlling various devices of the refrigeration cycle apparatus (20) is mounted. The control board (73) drives the compressor (40), the internal fan (59), and the external fan (57), and opens and closes the first valve (68) and the second valve (69) individually. The control board (73) is also provided with wiring for power supply and earthing.

[0059] (2-8) Storage Device The refrigeration cycle apparatus (20) includes a storage device (74). The storage device (74) is configured with a hard disk drive (HDD), a random access memory (RAM), a solid state drive (SSD), or the like. The storage device (74) stores current flow data relating to a corrosion protection current, which will be described later. The current flow data is data indicating a current flowing between the target component (TP) and a conductive film (47) provided on the target component (TP). The storage device (74) is provided as an external device separate from the control board (73). The storage device (74) may be mounted on the control board (73).

[0060] (2-9) Communication Device The refrigeration cycle apparatus (20) includes a communication device (75). The communication device (75) is a communication interface for the refrigeration cycle apparatus (20) to communicate with other external devices (terminal devices). The communication device (75) includes a modem. The communication device (75) transmits information about the refrigeration cycle apparatus (20) to the terminal devices. The communication device (75) receives information from the terminal devices. The communication device (75) is provided as an external device separate from the control board (73). The communication device (75) may be mounted on the control board (73).

[0061] (2-10) Inverter Board and DC Power Supply The refrigeration cycle apparatus (20) includes an inverter board (80). The inverter board (80) drives the motor (40M) of the compressor (40) and constitutes a power supply board that supplies power to the motor (40M). A generator (200) shown in FIG. 5 is connected to the refrigeration cycle apparatus (20). Three-phase power lines (81u, 81v, 81w) are connected to the generator (200).

[0062] The three-phase power supply lines (81u, 81v, 81w) are connected to an inverter board (80) via a reactor or the like (not shown). The inverter board (80) converts three-phase AC power supplied from the generator (200) via the three-phase power supply lines (81u, 81v, 81w). As shown in FIG. 5 , the inverter board (80) includes a converter section (82), a first smoothing capacitor (83), and an inverter section (84).

[0063] The converter section (82) converts the three-phase voltage from the generator (200) into direct current. The first smoothing capacitor (83) smoothes pulsation of the direct current smoothed by the converter section (82). The inverter section (84) converts the direct current smoothed by the first smoothing capacitor (83) into three-phase alternating current. The inverter board (80) supplies the three-phase power converted by the inverter section (84) to the motor (40M) of the compressor (40).

[0064] The refrigeration cycle apparatus (20) includes a DC power supply (88). The DC power supply (88) is arranged in the electrical component box (70). In this example, the DC power supply (88) is provided on an inverter board (80). The inverter board (80) includes a diode bridge unit (86), a second smoothing capacitor (87), and the DC power supply (88).

[0065] The diode bridge section (86) converts the three-phase voltage sent from the generator (200) into DC. The second smoothing capacitor (87) smoothes pulsation of the DC converted by the diode bridge section (86). The DC power supply (88) outputs the DC voltage smoothed by the second smoothing capacitor (87). The DC power supply (88) has a plurality of power supply ports (89).

[0066] The plurality of power supply ports (89) include a first power supply port (89a) and a second power supply port (89b). The first power supply port (89a) and the second power supply port (89b) are connection ports for outputting a DC voltage, and a plurality of power supply ports may be provided. A first power supply line (110) for applying a DC voltage to a target part (TP) is connected to the first power supply port (89a). A second power supply line (130) for operating a load device (PD) is connected to the second power supply port (89b).

[0067] (2-11) Target Component The refrigeration cycle apparatus (20) includes a target component (TP) made of metal. The target component (TP) is a component for which corrosion is to be inhibited by utilizing an external power supply type cathodic protection technology. In this example, the target component (TP) is the second casing (41) of the compressor (40). The second casing (41) is made of a steel plate.

[0068] As shown in Fig. 6, an exterior coating film (45) having a laminated structure is provided on the outer surface of the second casing (41). The exterior coating film (45) is formed after the composite electrode part (CP) is attached to the second casing (41). The exterior coating film (45) includes an insulating film (46), a conductive film (47), and a weather-resistant film (49). The insulating film (46), the conductive film (47), and the weather-resistant film (49) are laminated in this order on the outer surface of the second casing (41).

[0069] The insulating film (46) is provided on the outer surface of the second casing (41). The insulating film (46) is formed by applying a coating material made of an electrically insulating material. Examples of materials for the insulating film (46) include a composite material of modified epoxy resin and titanium oxide. The thickness of the insulating film (46) is, for example, about 1 μm to 200 μm.

[0070] The conductive film (47) is laminated on the surface of the insulating film (46). The conductive film (47) is formed by applying a coating material made of a conductive material with high electrical conductivity. Examples of materials for the conductive film (47) include a composite material of modified epoxy resin and conductive carbon black. The conductive film (47) is thinner than the insulating film (46). The thickness of the conductive film (47) is, for example, about 1 μm to 200 μm.

[0071] The weather-resistant film (49) is laminated on the surface of the conductive film (47). The weather-resistant film (49) is formed by applying a coating made of a weather-resistant resin material. Examples of materials for the weather-resistant film (49) include a composite material of fluororesin and titanium oxide. The weather-resistant film (49) is thicker than the conductive film (47). The thickness of the weather-resistant film (49) is, for example, about 1 μm to 200 μm.

[0072] As shown in FIG. 7 , the second casing (41) has legs (42) supported on the bottom plate (26) of the first casing (21). The legs (42) are fastened to the bottom plate (26) using fastening members (50). The bottom plate (26) is an example of another component. A vibration-isolating rubber (53) is provided between the legs (42) and the bottom plate (26). The fastening members (50) include a bolt (51) and a nut (52). The bolt (51) is fixed to the bottom plate (26). The head of the bolt (51) contacts the lower surface of the bottom plate (26). The shaft of the bolt (51) protrudes upward from a first through-hole (27) formed in the bottom plate (26).

[0073] The shank of the bolt (51) is inserted into an insertion hole (54) formed in the vibration-isolating rubber (53) and extends above the vibration-isolating rubber (53). A second through hole (44) is formed in the bottom piece (43) of the leg (42) that faces the bottom plate (26) with the vibration-isolating rubber (53) interposed therebetween. The shank of the bolt (51) is inserted into the second through hole (44). A nut (52) is fitted onto the portion of the shank of the bolt (51) that protrudes upward from the bottom piece (43). The nut (52) tightens the bottom piece (43) to the bottom plate (26) via a washer (55).

[0074] The conductive film (47) is not provided around the second through hole (44) on the outer surface of the bottom piece (43). A circular insertion hole (48) having a diameter larger than that of the second through hole (44) is formed in the conductive film (47). The periphery of the insertion hole (48) surrounds the periphery of the second through hole (44). The insertion hole (48) is not limited to a circular shape and may have other shapes, such as a rectangular shape. The bolt (51) is inserted inside the insertion hole (48), i.e., into a region of the second casing (41) where the conductive film (47) is not provided. The insulating film (46) and the weather-resistant film (49) are also provided in the region inside the insertion hole (48) of the conductive film (47).

[0075] (2-12) Current-Carrying Components The compressor (40) is exposed to a severe environment (conditions such as salt damage, rainwater, sunlight, and vibrations during transportation, as well as temperature, humidity, and flying debris) during the marine transportation of the container (10). Therefore, the exterior coating film (45) of the second casing (41) is relatively susceptible to deterioration. When the exterior coating film (45) deteriorates, it may peel off in parts, resulting in a defect that exposes the outer surface of the second casing (41). In this case, the second casing (41) corrodes from the exposed portion due to the effect of water adhering to the surface.

[0076] To prevent corrosion of the second casing (41), the refrigeration cycle apparatus (20) includes a mechanism for passing a corrosion-preventing current through the second casing (41). This mechanism is implemented using a DC power supply (88) and an electrically conductive component (90). The electrically conductive component (90) is an element that electrically connects the second casing (41) and the DC power supply (88). The refrigeration cycle apparatus (20) includes the electrically conductive component (90). As shown in FIG. 6 , the electrically conductive component (90) includes a composite electrode component (CP) and a first power supply line (110).

[0077] The composite electrode component (CP) is a rod-shaped component. The composite electrode component (CP) has a first terminal electrode (91), a second terminal electrode (94), and an insulator (97). The first terminal electrode (91) and the second terminal electrode (94) are integrated via the insulator (97). One end of the composite electrode component (CP) is embedded in the exterior coating film (45) of the second casing (41). The other end of the composite electrode component (CP) protrudes outward from the exterior coating film (45) of the second casing (41).

[0078] The insulator (97) is a hollow rod-like object, e.g., cylindrical, with both ends open. The insulator (97) penetrates the conductive film (47) and the weather-resistant film (49) in the longitudinal direction. One end of the insulator (97) is recessed into the insulating film (46) up to the middle in the thickness direction. The other end of the insulator (97) protrudes outward from the weather-resistant film (49). The insulator (97) is made of an insulating material having electrical insulating properties. Examples of materials for the insulator (97) include fluororesin.

[0079] The first terminal electrode (91) is an electrode connected to the second casing (41). The first terminal electrode (91) is a rod-like object, such as a cylindrical object. The first terminal electrode (91) is disposed inside the insulator (97). The first terminal electrode (91) is inserted into the insulator (97) and extends from openings at both ends of the insulator (97). One end of the first terminal electrode (91) extends from an open end located within the exterior coating film (45) of the insulator (97) and reaches the outer surface of the second casing (41). A first annular portion (92) is provided at one end of the first terminal electrode (91).

[0080] The first annular portion (92) protrudes toward the outer periphery of the first terminal electrode (91). The first annular portion (92) is metal-joined to the outer surface of the second casing (41) at a plurality of locations spaced apart in the circumferential direction by spot welding. The contact between the first annular portion (92) and the second casing (41) ensures a connection area between the first terminal electrode (91) and the second casing (41). One end of the insulator (97) abuts against the inner periphery of the first annular portion (92).

[0081] The other end of the first terminal electrode (91) extends from an open end of the insulator (97) located outside the exterior coating film (45) and is exposed to the outside of the insulator (97). A first connection portion (93) is provided at the other end of the first terminal electrode (91). The first connection portion (93) has a first fastener (93a). The first fastener (93a) is a means for fixing the first power supply line (110) (first cathode ray (111)) in a connected state to the first connection portion (93). The first terminal electrode (91) is made of a conductive material with high electrical conductivity. Examples of materials for the first terminal electrode (91) include stainless steel such as SUS304.

[0082] The second terminal electrode (94) is an electrode connected to the conductive film (47) included in the exterior coating film (45). The second terminal electrode (94) is a hollow rod-like object, such as a cylindrical object, with both ends open. An insulator (97) is inserted into the second terminal electrode (94). The insulator (97) extends from both end openings of the second terminal electrode (94). The second terminal electrode (94) is located on the outer periphery of the insulator (97). One end of the second terminal electrode (94) is immersed in the conductive film (47). The surface of the second terminal electrode (94) is roughly polished to form fine irregularities.

[0083] A second annular portion (95) is provided at one end of the second terminal electrode (94). The second annular portion (95) protrudes toward the outer periphery of the second terminal electrode (94). The second annular portion (95) is located between the insulating film (46) and the conductive film (47) or within the conductive film (47). In addition to the unevenness on the surface of the second terminal electrode (94), contact between the second annular portion (95) and the conductive film (47) ensures a contact area between the second terminal electrode (94) and the conductive film (47). Furthermore, the second annular portion (95) prevents the second terminal electrode (94) from penetrating into the insulating film (46).

[0084] The other end of the second terminal electrode (94) extends along the outer circumferential surface of the insulator (97) outside the exterior coating film (45) and is exposed to the outside of the exterior coating film (45). A second connection portion (96) is provided at the other end of the second terminal electrode (94). The second connection portion (96) has a second fastener (96a). The second fastener (96a) is a means for fixing the first power supply line (110) (the second anode wire (132)) in a connected state to the second connection portion (96). The second terminal electrode (94) is made of a conductive material with high electrical conductivity. An example of a material for the second terminal electrode (94) is a copper pipe.

[0085] A sealing member (98) is provided around the entire periphery of the composite electrode part (CP) on the outer surface of the exterior coating film (45). The sealing member (98) fills the boundary between the composite electrode part (CP) (second terminal electrode (94)) and the outer surface of the exterior coating film (45) (weather-resistant film (49)) to prevent water from penetrating into the exterior coating film (45) from between the exterior coating film (45) and the composite electrode part (CP). The sealing member (98) is made of, for example, a silicone sealant.

[0086] A disk member (99) is attached to the end of the insulator (97) located outside the exterior coating film (45). The disk member (99) is provided in duplicate at a distance from each other in the longitudinal direction of the insulator (97). The disk member (99) is a member for preventing leakage current from the surface of the insulator (97). The disk member (99) is made of an insulating material having electrical insulating properties. Examples of materials for the disk member (99) include fluororesin.

[0087] The composite electrode part (CP) is attached to the second casing (41) by fixing the first annular portion (92) to the outer surface of the second casing (41) by spot welding. The entire portion of the composite electrode part (CP) protruding from the exterior coating film (45) is resin-molded and covered with a molded part (100) made of synthetic resin (shown by dashed lines in FIG. 5 and omitted in FIG. 8 for convenience). The molded part (100) is provided so as to also cover the entire seal member (98). The molded part (100) encases the entire first connection part (93) and the second connection part (96) and a part of the first power supply line (110) (the first cathode wire (111) and the first anode wire (112)).

[0088] The first power supply line (110) is a wire that connects the first terminal electrode (91) and the second terminal electrode (94) to the DC power supply (88). The first power supply line (110) includes a first cathode line (111) and a first anode line (112). The first cathode line (111) is a wire that applies a predetermined low potential. The first anode line (112) is a wire that applies a predetermined high potential. The first cathode line (111) and the first anode line (112) are each made of a vinyl-coated copper wire.

[0089] The first cathode wire (111) and the first anode wire (112) are both connected to a first power supply port (89a) of the DC power supply (88). The first cathode wire (111) is connected to a negative terminal of the DC power supply (88). The first cathode wire (111) is fixed to the first connection portion (93) by a first fastener (93a) and connected to the first terminal electrode (91). The first anode wire (112) is connected to a positive terminal of the DC power supply (88). The first anode wire (112) is fixed to the second connection portion (96) by a second fastener (96a) and connected to the second terminal electrode (94).

[0090] The DC power supply (88) applies a DC voltage between the first terminal electrode (91) and the second terminal electrode (94), with the first terminal electrode (91) serving as a cathode and the second terminal electrode (94) serving as an anode. This DC voltage is applied continuously while the refrigeration cycle apparatus (20) is in operation. The DC voltage may be applied intermittently while the refrigeration cycle apparatus (20) is in operation. The DC voltage applied by the DC power supply (88) between the first terminal electrode (91) and the second terminal electrode (94) is, for example, about 5 V. The magnitude of the DC voltage is appropriately set so as to obtain a current required for cathodic protection.

[0091] As shown in FIG. 8 , when the exterior coating film (45) partially peels off due to deterioration, resulting in a defect exposing the outer surface of the second casing (41), water (W) such as rainwater, seawater, or condensation water adheres to the defect. This water (W) establishes electrical continuity between the second casing (41) and the conductive film (47). When this occurs, a current corresponding to a DC voltage applied between the first terminal electrode (91) and the second terminal electrode (94) (hereinafter referred to as an anticorrosion current) flows through the second casing (41) and the conductive film (47). The flow of the anticorrosion current reduces the potential of the second casing (41) to an inactive region. This inhibits the progression of corrosion of the second casing (41) from the defect in the exterior coating film (45).

[0092] (2-13) Load Device The refrigeration cycle apparatus (20) includes a load device (PD). The load device (PD) is a device that operates using direct current. In this example, the load device (PD) is a crankcase heater (120) shown in FIG. 4. The crankcase heater (120) is provided in the compressor (40). The crankcase heater (120) is an electric heater, and is attached to an oil reservoir in the lower part of the compressor (40) where refrigeration oil is stored. As shown in FIG. 5, a second power supply line (130) is connected to the crankcase heater (120).

[0093] The second power supply wire (130) is a wire that connects the crankcase heater (120) to the DC power supply (88). The second power supply wire (130) includes a second cathode wire (131) and a second anode wire (132). The second cathode wire (131) is a wire for applying a predetermined low potential. The second anode wire (132) is a wire for applying a predetermined high potential. The second cathode wire (131) and the second anode wire (132) are each made of a vinyl-coated copper wire.

[0094] The second cathode ray (131) and the second anode ray (132) are both connected to a second power supply port (89b) of the DC power supply (88). The second cathode ray (131) is connected to a negative terminal of the DC power supply (88). The second anode ray (132) is connected to a positive terminal of the DC power supply (88). The crankcase heater (120) is energized before the compressor (40) is started to heat the oil reservoir. This evaporates and reduces the refrigerant dissolved in the refrigeration oil stored in the oil reservoir, thereby suppressing the generation of bubbles in the refrigeration oil.

[0095] (2-14) Control Unit The refrigeration cycle apparatus (20) includes a control unit (140) shown in FIG. 4. The control unit (140) controls the refrigeration cycle apparatus (20). The control unit (140) includes the above-described control board (73). The control unit (140) has a microprocessor (141) and a memory device (142). The microprocessor (141) and the memory device (142) are mounted on the control board (73).

[0096] The memory device (142) stores programs for operating the microprocessor (141) and data used by the programs. The memory device (142) is a semiconductor memory such as a random access memory (RAM). The microprocessor (141) reads programs from the memory device (142) and executes various processes. The microprocessor (141) includes a central processing unit (CPU), a register, an interface circuit, and the like.

[0097] The control unit (140) controls the execution of the refrigeration cycle. Specifically, the control unit (140) controls the on / off switching of the compressor (40) and the rotation speed of the motor (40M) of the compressor (40). The control unit (140) controls the on / off switching of the external fan (57) and the rotation speed of the motor of the external fan (57). The control unit (140) controls the on / off switching of the internal fan (59) and the rotation speed of the motor of the internal fan (59). The control unit (140) controls the opening degree of the expansion valve (61). The control unit (140) controls the open / closed states of the first valve (68) and the second valve (69).

[0098] The control unit (140) monitors whether an anticorrosion current flows through the second casing (41) and the conductive film (47). The control unit (140) receives a detection signal from the current sensor (150). The current sensor (150) is attached to the first power supply line (110) (the first cathode ray (111) or the first anode ray (112)). The current sensor (150) is a sensor for detecting the value of a current flowing through the first power supply line (110). Based on the detection signal from the current sensor (150), the control unit (140) detects whether an anticorrosion current has flowed through the second casing (41) and the conductive film (47).

[0099] When the control unit (140) detects that an anticorrosive current has flowed through the second casing (41), it notifies the terminal device via the communication device (75) of information indicating that the second casing (41) has been energized. This notifies the relevant parties of the energization of the second casing (41). The relevant parties include users, maintenance companies, service companies, distributors, managers, etc. of the container (10). The control unit (140) also stores data indicating the anticorrosive current flowing through the second casing (41) and the conductive film (47) (hereinafter referred to as energization data) in the storage device (74).

[0100] Features of the Embodiment In the refrigeration cycle apparatus (20) of this embodiment, the current-carrying component (90) applies a DC voltage output from a DC power supply (88) between the first terminal electrode (91) and the second terminal electrode (94). The DC voltage is applied with the first terminal electrode (91) as a cathode and the second terminal electrode (94) as an anode. Therefore, when water (W) adheres to a defect in the exterior coating film (45), for example, and conducts electricity between the second casing (41) and the conductive film (47), a protective current corresponding to the DC voltage flows through the second casing (41) and the conductive film (47), thereby providing cathodic protection to the second casing (41). This inhibits corrosion of the second casing (41).

[0101] In the refrigeration cycle apparatus (20) of this embodiment, the DC power supply (88) is arranged in the electrical component box (70), which eliminates the need for extra space for providing the DC power supply (88).

[0102] In the refrigeration cycle apparatus (20) of this embodiment, a DC power supply (88) is provided on an inverter board (80) for driving the motor (40M) of the compressor (40). This allows the power supplied to the inverter board (80) to be used for the DC power supply (88). This allows a mechanism for supplying power to the DC power supply (88) to be realized with a simple configuration.

[0103] In the refrigeration cycle apparatus (20) of this embodiment, the DC power supply (88) is also used as a power supply for operating the crankcase heater (120) other than the current-carrying component (90). This allows cathodic protection of the second casing (41) to be performed using the DC power supply (88) for operating the crankcase heater (120). This reduces costs compared to when a DC power supply (88) for cathodic protection is provided separately from the power supply for the crankcase heater (120).

[0104] The refrigeration cycle apparatus (20) of this embodiment uses a composite electrode component (CP) in which a first terminal electrode (91) and a second terminal electrode (94) are integrated with an insulator (97) interposed therebetween. The insulator (97) is a hollow rod-like member with both ends open, and extends longitudinally through the conductive film (47). The first terminal electrode (91) is disposed inside the insulator (97). This allows the first terminal electrode (91) to be connected to the second casing (41) while being insulated from the second terminal electrode (94) and the conductive film (47). The second terminal electrode (94) is located on the outer periphery of the insulator (97). This allows the second terminal electrode (94) to be connected to the conductive film (47) while being insulated from the first terminal electrode (91). The use of such a composite electrode component (CP) reduces the space required for providing the first terminal electrode (91) and the second terminal electrode (94). Furthermore, since the first terminal electrode (91) and the second terminal electrode (94) can be handled as a single unit, the number of steps required for attaching the first terminal electrode (91) and the second terminal electrode (94) can be reduced.

[0105] In the refrigeration cycle apparatus (20) of this embodiment, the fastening member (50) is inserted into a region of the second casing (41) that does not have the conductive film (47), thereby preventing electrical conduction between the second casing (41) and the conductive film (47) through the fastening member (50).

[0106] In the refrigeration cycle apparatus (20) of this embodiment, the target component (TP) is the second casing (41) of the compressor (40). The exterior coating (45) of the second casing (41) of the compressor (40) is subjected to stress due to temperature changes from the inside of the compressor (40) as well as temperature changes in the external environment, and deteriorates over time. Therefore, there is a concern that deterioration of the exterior coating (45) will accelerate corrosion of the second casing (41). The external power supply type cathodic protection technique of this embodiment is effective in suppressing such corrosion of the second casing (41).

[0107] In the refrigeration cycle apparatus (20) of this embodiment, the control unit (140) monitors whether an anticorrosion current corresponding to the DC voltage output from the DC power supply (88) flows through the second casing (41) and the conductive film (47). In this manner, when the control unit (140) detects that an anticorrosion current has flowed through the second casing (41) and the conductive film (47), it notifies a target person, such as a user, maintenance company, service company, distributor, or manager of the container (10), so that the second casing (41) can be repaired, replaced, or otherwise handled before a malfunction occurs.

[0108] In the refrigeration cycle apparatus (20) of this embodiment, the control unit (140) stores energization data indicating an anticorrosion current flowing through the second casing (41) and the conductive film (47) in the storage device (74). This allows a user, maintenance company, service company, dealer, manager, or the like of the container (10) to read the energization data stored in the storage device (74) and check the presence or absence and history of energization related to cathodic protection of the second casing (41).

[0109] In this embodiment, the refrigeration cycle apparatus (20) is provided in a transport container (10) used for marine transportation. In such a transport container (10), if the exterior coating film (45) applied to the second casing (41) of the compressor (40) included in the refrigeration cycle apparatus (20) deteriorates and peels off, causing a defect, the second casing (41) is susceptible to corrosion due to the influence of seawater. The external power supply type cathodic protection technique according to this embodiment is effective in suppressing such corrosion of the second casing (41).

[0110] <<Modification 1>> Modification 1 is a refrigeration cycle apparatus (20) configured to be accessible to a server apparatus (300) on a network (N).

[0111] 9, the refrigeration cycle apparatus (20) includes a communication device (75) and a control unit (140). The control unit (140) is connected to a server device (300) via a network (N) by the function of the communication device (75). The server device (300) may be a physical server or a cloud server.

[0112] The control unit (140) stores, via the communication device (75), current flow data indicating the anticorrosive current flowing through the second casing (41) and the conductive film (47) in the server device (300) on the network (N). The current flow data is stored continuously or intermittently while the refrigeration cycle apparatus (20) is operating, regardless of whether or not current is flowing through the second casing (41). The current flow data may be stored only when it is detected that the anticorrosive current has flowed through the second casing (41).

[0113] In the refrigeration cycle apparatus (20) of the first modified example, the control unit (140) stores energization data indicating an anticorrosion current flowing between the second casing (41) and the conductive film (47) in the server device (300) on the network (N) via the communication device (75). This allows the user, maintenance company, service company, distributor, manager, etc. of the container (10) to access the server device (300) and check the presence or absence of energization related to cathodic protection in the second casing (41) and its history.

[0114] <<Modification 2>> Modification 2 is a monitoring system (400) that monitors the risk of corrosion of the second casings (41) of the compressors (40) in a plurality of refrigeration cycle apparatuses (20).

[0115] As shown in Fig. 10, the monitoring system (400) includes a plurality of refrigeration cycle devices (20) and a monitoring device (410). The plurality of refrigeration cycle devices (20) are provided in different container bodies (11). That is, the individual refrigeration cycle devices (20) belong to different containers (10). Each refrigeration cycle device (20) includes a communication device (75) and a control unit (140).

[0116] The control unit (140) of each refrigeration cycle apparatus (20) is connected to the monitoring device (410) via the network (N) by the function of the communication device (75). The control unit (140) transmits current flow data indicating the anticorrosion current flowing through the second casing (41) and the conductive film (47) to the monitoring device (410) via the communication device (75). This current flow data is transmitted continuously or intermittently while the refrigeration cycle apparatus (20) is operating. The current flow data may be transmitted only when it is detected that the anticorrosion current has flowed through the second casing (41).

[0117] The monitoring device (410) is configured to be able to communicate with a plurality of refrigeration cycle devices (20). As shown in Fig. 11, the monitoring device (410) includes, as hardware elements, a monitoring control unit (420), a monitoring storage device (430), an I / F device (440), and a monitoring communication device (450).

[0118] The monitoring control unit (420) has a microprocessor and a memory device. The memory device (142) stores programs and data for operating the microprocessor. The microprocessor reads the programs from the memory device and executes various processes. The monitoring storage device (430) stores current flow data related to the anticorrosion current. The monitoring storage device (430) includes a RAM, an SSD, an HDD, etc.

[0119] The I / F device (440) is a device that connects to an external device and communicates with and controls the external device. In this example, an operation device (441) and a display device (442) are connected to the monitoring device (410) via the I / F device (440). The operation device (441) accepts various operations. The display device (442) displays various information. The monitoring communication device (450) is a communication interface that enables communication between the monitoring device (410) and the external device.

[0120] The monitoring control unit (420) receives energization data from each refrigeration cycle apparatus (20) via the monitoring communication device (450). The monitoring control unit (420) stores the energization data received from each refrigeration cycle apparatus (20) in the monitoring storage device (430). A target person such as a user, maintenance company, service company, dealer, or manager of the container (10) can read the energization data stored in the monitoring storage device (430) and display it on the display device (442) by operating the operation device (441).

[0121] Furthermore, the monitoring control section (420) monitors whether an anticorrosive current flows through the second casing (41) of each of the refrigeration cycle devices (20) based on the current flow data received from the plurality of refrigeration cycle devices (20). When the monitoring control section (420) detects that an anticorrosive current flows through the second casing (41) of any of the refrigeration cycle devices (20), the monitoring control section (420) notifies the terminal device via the monitoring communication device (450) of information indicating that current has flowed through the second casing (41).

[0122] This notifies the subject that the second casing (41) is energized. At this time, the information notified to the terminal device also includes information as to which refrigeration cycle apparatus (20) the energized second casing (41) belongs to. This enables the subject, who sees the notification from the terminal device, to know in which refrigeration cycle apparatus (20) the risk of corrosion of the second casing (41) is increasing and from when the risk of corrosion of the second casing (41) has been increasing.

[0123] In the monitoring system (400) of the second modification, the monitoring device (410) is configured to be able to communicate with a plurality of refrigeration cycle apparatuses (20) and monitors the flow of anticorrosion current through the second casing (41) of each of the refrigeration cycle apparatuses (20). This allows the current-carrying states of the second casings (41) in the plurality of refrigeration cycle apparatuses (20) to be remotely and collectively grasped. Depending on the current-carrying states of the individual second casings (41), repairs, replacements, or other measures can be taken before a malfunction occurs in the second casings (41). Furthermore, by statistically processing the current-carrying data stored in the monitoring storage device (430), it is possible to analyze under what circumstances the exterior coating film (45) of the second casing (41) is likely to peel off.

[0124] Other Embodiments The first terminal electrode (91) and the second terminal electrode (94) do not have to be provided as a composite electrode component (CP). The first terminal electrode (91) and the second terminal electrode (94) may be attached to the target component (TP) as separate components. A plurality of the separate first terminal electrodes (91) and second terminal electrodes (94) or composite electrode components (CP) may be attached to the target component (TP) so as to be spaced apart from each other.

[0125] The target part (TP) may be any metal part included in the refrigeration cycle apparatus (20) other than the second casing (41) of the compressor (40). The target part (TP) does not have to be a metal part included in the refrigeration cycle apparatus (20) of the container (10). For example, the target part (TP) may be a heat transfer tube or a piping. The target part (TP) may be a drain pan or an outer panel of an outdoor unit included in an air conditioning system for a building. The technology of the present disclosure is effective for all metal components that are at risk of corrosion in the refrigeration cycle apparatus (20).

[0126] The load device (PD) may be any device other than the crankcase heater (120) as long as it is operated by DC current. For example, the load device (PD) may be a DC fan. In this case, the DC power supply (88) may have two or more second power supply ports (89b), and both the crankcase heater (120) and the DC fan may be connected to separate second power supply ports (89b) via second power supply lines (130).

[0127] The DC power supply (88) does not have to generate a DC voltage using power supplied to the inverter board (80) as long as it can output a DC voltage. For example, the DC power supply (88) may be formed of a battery. In this case, the magnitude of the output voltage is adjusted by connecting a plurality of batteries in series. Furthermore, the DC power supply (88) may be provided separately from the inverter board (80), or may be arranged outside the electrical component box (70) by being housed in a separate protective box.

[0128] The refrigeration cycle apparatus (20) may include a notification unit. The notification unit may have a monitor and notify the user of the energization of the second casing (41) by displaying characters, figures, symbols, icons, etc. on the monitor. The notification unit may have a lamp such as an LED and notify the user of the energization of the second casing (41) by turning on the lamp. The notification unit may have a speaker and notify the user of the energization of the second casing (41) by emitting a sound from the speaker. The notification unit may be configured to operate only when a predetermined operation is performed by a target person.

[0129] Although the embodiments and modifications have been described above, it will be understood that various modifications in form and details are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments and modifications may be combined or substituted as appropriate as long as the functionality of the subject matter of the present disclosure is not impaired.

[0130] The above-mentioned expressions such as "first," "second," etc. are used to distinguish the words and phrases to which they are attached, and do not limit the number or order of the words and phrases. Furthermore, the expression "to" in the above-mentioned ranges of values ​​means a range that includes the values ​​before and after it. In other words, if X and Y are used as substitutes for numerical values, then the expression "X to Y" indicates a range of "greater than or equal to X and less than or equal to Y."

[0131] INDUSTRIAL APPLICABILITY As described above, the present disclosure is useful for a refrigeration cycle device, a monitoring system, and a container.

[0132] CP Composite electrode part EP Electrical part PD Load device TP Target part 10 Container 11 Container body 20 Refrigeration cycle device 26 Bottom plate (other part) 40 Compressor 41 Second casing (casing) 40M Motor 46 Insulating film 47 Conductive film 50 Fastening member 60 Refrigerant circuit 70 Electrical component box 74 Storage device 75 Communication device 80 Inverter board 88 DC power supply 89a First power supply port 89b Second power supply port 90 Current-carrying part 91 First terminal electrode 94 Second terminal electrode 97 Insulator 110 First power supply line 130 Second power supply line 300 Server device 400 Monitoring system 410 Monitoring device

Claims

1. A refrigeration cycle device comprising: a metallic target part (TP); a DC power supply (88) that outputs a DC voltage; and an energized part (90) that electrically connects the target part (TP) and the DC power supply (88), wherein an insulating film (46) and a conductive film (47) laminated on the insulating film (46) are provided on an outer surface of the target part (TP), the energized part (90) comprises a first terminal electrode (91) connected to the target part (TP) and a second terminal electrode (94) connected to the conductive film (47), and the DC power supply (88) applies the DC voltage between the first terminal electrode (91) and the second terminal electrode (94), with the first terminal electrode (91) as a cathode and the second terminal electrode (94) as an anode.

2. The refrigeration cycle apparatus according to claim 1, further comprising an electrical component box (70) for accommodating electrical components (EP), wherein the DC power supply (88) is disposed in the electrical component box (70).

3. A refrigeration cycle device according to claim 2, comprising a refrigerant circuit (60) that circulates a refrigerant to perform a refrigeration cycle, the refrigerant circuit (60) including a compressor (40), the electrical component box (70) housing an inverter board (80) for driving a motor (40M) of the compressor (40), and the DC power supply (88) being provided on the inverter board (80).

4. The refrigeration cycle apparatus according to any one of claims 1 to 3, further comprising: a load device (PD) operated by DC current; the current-carrying part (90) comprises a first power supply line (110) connecting the first terminal electrode (91) and the second terminal electrode (94) to the DC power supply (88); the DC power supply (88) has a first power supply port (89a) and a second power supply port (89b) each outputting a DC voltage; the first power supply line (110) is connected to the first power supply port (89a); and a second power supply line (130) for operating the load device (PD) is connected to the second power supply port (89b).

5. A refrigeration cycle apparatus according to any one of claims 1 to 4, wherein the first terminal electrode (91) and the second terminal electrode (94) are integrated with each other via an insulator (97) to form a composite electrode part (CP), the insulator (97) is a hollow rod-like object with both ends open and passing through the conductive film (47) in the longitudinal direction, the first terminal electrode (91) is disposed inside the insulator (97), and the second terminal electrode (94) is located on the outer periphery of the insulator (97).

6. A refrigeration cycle device according to any one of claims 1 to 5, wherein the target part (TP) is fastened to another part (26) using a fastening member (50), and the fastening member (50) is inserted into an area of the target part (TP) that does not have a conductive film (47).

7. A refrigeration cycle device according to any one of claims 1 to 6, comprising a refrigerant circuit (60) that circulates a refrigerant to perform a refrigeration cycle, the refrigerant circuit (60) including a compressor (40), and the target part (TP) is a casing (41) of the compressor (40).

8. The refrigeration cycle apparatus according to any one of claims 1 to 7, further comprising a control unit (140) that controls execution of the refrigeration cycle, wherein the control unit (140) monitors whether a current corresponding to the DC voltage flows through the target part (TP) and the conductive film (47).

9. The refrigeration cycle apparatus according to claim 8, further comprising a storage device (74) for storing data, wherein the control unit (140) causes the storage device (74) to store data indicating the current flowing through the target part (TP) and the conductive film (47).

10. A refrigeration cycle apparatus according to claim 8, further comprising a communication device (75) for communicating with other devices, wherein the control unit (140) stores data indicating the target part (TP) and the current flowing through the conductive film (47) in a server device (300) on a network (N) via the communication device (75).

11. A monitoring system comprising: a plurality of refrigeration cycle apparatuses (20) according to any one of claims 1 to 10; and a monitoring device (410) configured to be able to communicate with a plurality of said refrigeration cycle apparatuses (20), wherein said refrigeration cycle apparatuses (20) comprise a communication device (75) for communicating with other devices, and transmit data indicating a current flowing between said target part (TP) and said conductive film (47) to said monitoring device (410) via said communication device (75), and said monitoring device (410) monitors the flow of said current to said target part (TP) in said refrigeration cycle apparatus (20) based on the data received from said refrigeration cycle apparatus (20).

12. A container used for marine transportation, comprising: a refrigeration cycle device (20) according to any one of claims 1 to 10; and a container body (11) in which the refrigeration cycle device (20) is installed.

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