Vehicle refrigeration unit, vehicle

Abstract

To easily and safely perform maintenance, to improve a maintenance property, and to reduce maintenance costs.SOLUTION: A vehicular refrigerator unit includes: a box-shaped container that can be mounted on a vehicle body; a refrigeration cycle that is equipped with at least an indoor heat exchanger disposed in the container, and an electric compressor compressing a refrigerant supplied into the indoor heat exchanger; a strong electricity facility that is equipped with a booster converter boosting DC lower voltage supplied from a low voltage DC power source provided on the vehicle body side to DC high voltage, and an inverter electrically connected with the booster converter and converting the DC high voltage into AC high voltage; a weak electricity facility that is driven at lower voltage than the strong electricity facility and is equipped with a controller controlling the operation of the inverter; a strong electricity storage box that stores the strong electricity facility; a weak electricity storage box that stores the weak electricity facility; and a box-shaped unit body that is installed on a front surface upper part of the container or an upper surface of the container, and stores the strong electricity storage box.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a refrigeration unit for vehicles and vehicles.

Background Art

[0002] In vehicles such as trucks and trailers towed by tractors, there are some equipped with containers having a transport refrigeration unit. Such a transport refrigeration unit includes a compressor that compresses a refrigerant, a drive device that drives the compressor, a control device that controls the drive device, and the like. For example, Patent Document 1 discloses a configuration including an electric compressor disposed in a container (transport container), an electric power system facility that drives the electric compressor, and an electric control system facility that controls the drive of the electric compressor. In this configuration, the electric equipment unit is disposed in a box provided on the front side of the container. This electric equipment unit has a first electric equipment box that houses the electric power system facility and a second electric equipment box that houses the electric control system facility. The first electric equipment box and the second electric equipment box are arranged side by side with a gap in the front-rear direction.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration described in Patent Document 1, although a first electrical equipment box housing high-voltage equipment and a second electrical equipment box housing low-voltage equipment are provided separately with a gap between them, both the first and second electrical equipment boxes are located at a low position inside the box on the front side of the container. Therefore, if a worker accidentally opens the first electrical equipment box during maintenance, for example, there is a possibility that they may come into contact with the high-voltage equipment housed in the first electrical equipment box, which carries a high voltage of, for example, 200V or more. For this reason, even when performing maintenance only on low-voltage equipment, the worker must be qualified to handle high voltage. In addition, the worker must be equipped with gloves and other tools that can withstand high voltage. These factors can lead to a decrease in the maintainability of transport refrigeration units and an increase in maintenance costs.

[0005] This disclosure is made to solve the above-mentioned problems and aims to provide a vehicle refrigeration unit and vehicle that can be easily and safely maintained, thereby improving maintainability and reducing maintenance costs. [Means for solving the problem]

[0006] To solve the above problems, the vehicle refrigeration unit according to this disclosure comprises a box-shaped container that can be mounted on the vehicle body, a refrigeration cycle comprising at least an indoor heat exchanger and an electric compressor for compressing the refrigerant supplied to the indoor heat exchanger, a boost converter for boosting a low DC voltage supplied from a low-voltage DC power supply provided on the vehicle body side to a high DC voltage, and an inverter electrically connected to the boost converter and converting the high DC voltage to a high AC voltage, a low-voltage system equipment that is driven at a lower voltage than the high-voltage system equipment and includes a controller for controlling the operation of the inverter, a high-voltage system housing box that houses the high-voltage system equipment, a low-voltage system housing box that houses the low-voltage system equipment, and a box-shaped unit body installed on the upper front of the container or on the top surface of the container and housing at least the high-voltage system housing box.

[0007] The vehicle relating to this disclosure comprises a vehicle refrigeration unit as described above, and a vehicle body positioned in front of the container and equipped with a cabin on which an occupant can board. [Effects of the Invention]

[0008] According to the vehicle refrigeration unit and vehicle disclosed herein, maintenance can be performed easily and safely, improving maintainability and reducing maintenance costs. [Brief explanation of the drawing]

[0009] [Figure 1] This figure shows a schematic configuration of a vehicle equipped with a vehicle refrigeration unit according to an embodiment of the present disclosure. [Figure 2] This block diagram shows the functional configuration of the high-voltage and low-voltage equipment of the above-mentioned vehicle refrigeration unit. [Figure 3] This is a perspective view showing the configuration of the main unit of the above-mentioned vehicle refrigeration unit. [Figure 4] This is a perspective view showing the frame of the unit body, the high-voltage equipment housing, and the low-voltage equipment housing. [Figure 5] This is a perspective view showing the high-voltage lid of the high-voltage housing box and the low-voltage lid of the low-voltage housing box in the open position. [Figure 6] This is a cross-sectional view showing the condition of the above-mentioned low-voltage equipment during maintenance. [Figure 7] This block diagram shows the state in which the application of DC high voltage is interrupted in the high-voltage and low-voltage equipment of the above-mentioned vehicle refrigeration unit. [Figure 8] This figure shows a schematic configuration of a vehicle equipped with a vehicle refrigeration unit according to a modified embodiment of the present disclosure. [Modes for carrying out the invention]

[0010] The following describes embodiments for implementing the vehicle refrigeration unit and vehicle according to this disclosure, with reference to the attached drawings. However, this disclosure is not limited to these embodiments. (Vehicle configuration) As shown in Figure 1, the vehicle 1 comprises a vehicle body 2 and a vehicle refrigeration unit 10. Hereinafter, the direction of travel of the vehicle 1 will be referred to as the longitudinal direction Da, the direction perpendicular to the longitudinal direction Da and connecting the left and right sides of the vehicle 1 as seen from the perspective of the occupants will be referred to as the width direction Dw, and the direction perpendicular to the longitudinal direction Da and the width direction Dw will be referred to as the vertical direction Dv. In this embodiment, the vehicle body 2 is, for example, a truck. In this case, the vehicle body 2 comprises a chassis 4 and a cabin 5 on which an occupant can ride. The vehicle body 2 may also be, for example, a trailer. In this case, the vehicle body 2 comprises a tractor on which a vehicle refrigeration unit 10 can be mounted, and a cabin 5 that tows the tractor and on which an occupant can ride.

[0011] The chassis 4 extends in the longitudinal direction Da. The chassis 4 is equipped with multiple wheels 4w. The chassis 4 is equipped with a drive engine (not shown) for propelling the vehicle body 2. The engine is mounted at the front of the chassis 4 in the longitudinal direction Da. Cabin 5 is located at the front of the chassis 4, above the engine. A vehicle refrigeration unit 10 is mounted at the rear of the chassis 4 in the longitudinal direction Da. Cabin 5 is positioned in front of the vehicle refrigeration unit 10.

[0012] As shown in Figure 2, the vehicle body 2 includes a generator 101 driven by the engine and a battery 102. The generator 101 is located near the engine. The generator 101 generates electricity by being rotated by the engine. The generator 101 is a low-voltage DC power supply 100, which generates a DC low voltage DL of, for example, 27V. The battery 102 is located at the rear of the chassis 4. The battery 102 is a low-voltage DC power supply 100, which outputs a DC low voltage DL of, for example, 27V.

[0013] As shown in Figure 1, the vehicle refrigeration unit 10 mainly comprises a container 11, a refrigeration cycle 12, and a unit body 50. Container 11 is mounted on chassis 4. Container 11 is located behind cabin 5. Container 11 is formed as a hollow rectangular parallelepiped extending in the front-rear direction Da. Container 11 is capable of accommodating cargo requiring refrigeration or freezing. Container 11 comprises a bottom plate 11a, a front wall 11b, a rear wall 11c, a pair of side walls 11d, and a top plate 11e. The bottom plate 11a forms the bottom surface of container 11. The bottom plate 11a is rectangular in plan view with its longer side in the front-rear direction Da, and is fixed on chassis 4. The front wall 11b rises upward from the front edge of bottom plate 11a. The rear wall 11c rises upward from the rear edge of bottom plate 11a. The pair of side walls 11d each rise upward from the ends on both sides of the width direction Dw of bottom plate 11a. The top plate 11e forms the top surface 11t of container 11. The top plate 11e covers the space enclosed by the front wall 11b, the rear wall 11c, and the pair of side walls 11d from above.

[0014] The refrigeration cycle 12 includes an electric compressor 15, an indoor heat exchanger 13, an outdoor heat exchanger 14, an indoor heat exchange fan 17, an outdoor heat exchange fan 18, an expansion valve (not shown), an accumulator (not shown), and a receiver (not shown). The electric compressor 15, the outdoor heat exchanger 14, and the outdoor heat exchange fan 18 are built into the unit body 50, which will be described later. The electric compressor 15 compresses the refrigerant. The outdoor heat exchanger 14 is located outside the container 11. The outdoor heat exchanger 14 cools the refrigerant supplied from the electric compressor 15 by heat exchange with the outside air. The outdoor heat exchange fan 18 is located near the outdoor heat exchanger 14. The outdoor heat exchange fan 18 blows outside air into the outdoor heat exchanger 14. The refrigerant cooled by the outdoor heat exchanger 14 is supplied to the expansion valve (not shown) via a receiver (not shown). The expansion valve expands (depressurizes) the refrigerant supplied from the receiver.

[0015] The indoor heat exchanger 13 is provided in an indoor unit 19 provided inside the container 11. The indoor heat exchanger 13 cools the atmosphere inside the container 11 by performing heat exchange between the refrigerant expanded by the expansion valve and the atmosphere inside the container 11 (indoors). The indoor heat exchange fan 17 is provided in the indoor unit 19. The indoor heat exchange fan 17 is disposed near the indoor heat exchanger 13. The indoor heat exchange fan 17 cools the inside of the container 11 by sending the air cooled by the indoor heat exchanger 13 inside the container 11. An accumulator (not shown) receives the refrigerant that has passed through the indoor heat exchanger 13. The accumulator supplies the received refrigerant to the electric compressor 15.

[0016] As shown in FIG. 2, the vehicle refrigeration unit 10 includes a high-voltage electrical equipment 20 and a low-voltage electrical equipment 30 in order to operate the refrigeration cycle 12. The high-voltage electrical equipment 20 drives the electric compressor 15. The high-voltage electrical equipment 20 mainly includes an inverter 21, a boost converter 22, an AC-DC converter 23, and a buck converter 24. The boost converter 22 boosts the DC low voltage DL supplied from the battery 102 and the generator 101 as a low-voltage DC power supply 100 provided on the vehicle body 2 side to a DC high voltage DH of, for example, 270V.

[0017] The AC-DC converter 23 converts an AC high voltage AD of, for example, 230V supplied from a commercial power supply 200 outside the vehicle 1 into a DC high voltage DH of, for example, 270V. The inverter 21 converts the DC high voltage DH supplied from the boost converter 22 or the AC-DC converter 23 into a three-phase AC high voltage AH of, for example, 270V. The inverter 21 drives the electric compressor 15 by supplying the converted three-phase AC high voltage AH to the electric compressor 15.

[0018] The step-down converter 24 converts the DC high voltage DH supplied from the step-up converter 22 or AC-DC converter 23 into a DC low voltage DL of, for example, 27V. The step-down converter 24 supplies the converted DC low voltage DL to the low-voltage equipment 30.

[0019] The low-voltage equipment 30 is driven by a low-voltage DC voltage DL, for example 27V, which is lower than the high-voltage DC voltage DH used in the high-voltage equipment 20. The low-voltage equipment 30 is equipped with a controller 31 that controls the operation of the refrigeration cycle 12. The controller 31 comprises a main circuit section 32 and a relay circuit section 33.

[0020] The main circuit unit 32 operates using a DC low voltage DL supplied from the step-down converter 24. The main circuit unit 32 performs processing to control the operation of the inverter 21 based on a pre-stored program. The main circuit unit 32 receives input signals such as the set temperature inside the container 11 from the cabin controller 5c installed in the cabin 5. Based on detection signals from temperature sensors (not shown) installed inside and outside the container 11, the main circuit unit 32 outputs a control signal to operate the inverter 21 so that the temperature inside the container 11 maintains the set temperature. The control signal output from the main circuit unit 32 is transmitted to the inverter 21 via the communication circuit unit 28 installed in the high-voltage equipment 20.

[0021] The relay circuit 33 is electrically connected to the main circuit 32. Based on the signals output from the main circuit 32, the relay circuit 33 controls the operation of the indoor heat exchange fan 17 and the outdoor heat exchange fan 18.

[0022] As shown in Figure 1, the unit body 50 is installed on the outside of the container 11. The unit body 50 is installed on the upper front 11ft of the front wall 11b of the container 11. The unit body 50 is positioned above the cabin 5. The unit body 50 as a whole is box-shaped. As shown in Figures 3 and 4, the unit body 50 comprises a frame 51 and decorative panels 52.

[0023] As shown in Figure 4, the frame 51 is fixed to the front wall 11b of the container 11. The frame 51 integrally comprises a bottom plate 51a and a peripheral wall portion 51w. The peripheral wall portion 51w includes a rear plate 51b, side plates 51c and 51d, and a front plate 51e. In plan view, the bottom plate 51a is formed in a rectangular shape that is long in the width direction Dw. The rear plate 51b rises upward from the rear edge of the bottom plate 51a. The rear plate 51b is fixed to the front wall 11b of the container 11. The side plates 51c and 51d rise upward from the side edges on both sides of the bottom plate 51a in the width direction Dw. The front plate 51e rises upward from the front edge of the bottom plate 51a. Notches 51k are formed in parts of the side plates 51d and the front plate 51e that constitute the peripheral wall portion 51w.

[0024] As shown in Figure 3, the decorative panel 52 integrally comprises an upper panel 52a, a front panel 52b, and side panels 52c and 52d. When viewed from above, the upper panel 52a is formed in a rectangular shape that is long in the width direction Dw. The front panel 52b extends downward from the front edge of the upper panel 52a. The side panels 52c and 52d extend downward from both sides of the upper panel 52a in the width direction Dw. The decorative panel 52 is detachably attached to the frame 51 via stays or the like (not shown). When the decorative panel 52 is attached to the frame 51, the upper panel 52a is formed to cover the entire frame 51 from above. When the decorative panel 52 is attached to the frame 51, the front panel 52b and the side panels 52c and 52d are positioned with a horizontal gap between them and the frame 51.

[0025] The frame 51 is fitted with an electric compressor 15, an outdoor heat exchanger 14, an outdoor heat exchange fan 18, an expansion valve (not shown), an accumulator (not shown), and a receiver (not shown), which constitute part of the refrigeration cycle 12 shown in Figure 1. The electric compressor 15, the expansion valve (not shown), the accumulator (not shown), and the receiver (not shown) are housed inside the peripheral wall portion 51w of the frame 51. As shown in Figure 4, the outdoor heat exchanger 14 is provided so as to cover the notch 51k and constitutes part of the peripheral wall portion 51w. The upper panel 52a of the decorative panel 52 has a fan opening (not shown) formed therein, which allows the air inside the unit body 50 to be sent to the outside by the rotation of the outdoor heat exchange fan 18.

[0026] As shown in Figures 4 to 6, a high-voltage system housing box 60 and a low-voltage system housing box 70 are arranged inside the main unit body 50. The power supply housing 60 is housed inside the peripheral wall portion 51w of the frame 51. In other words, the frame 51 is provided so as to surround the power supply housing 60 when viewed from above. The power supply housing 60 is positioned within the frame 51, close to the side plate 51c on one side in the width direction Dw. The power supply housing 60 comprises a power supply box body 61 and a power supply lid body 63. The power supply box body 61 is formed in the shape of a bottomed box with an upper opening 62 that opens upwards. As shown in Figure 2, the power supply box body 61 houses the inverter 21, boost converter 22, AC-DC converter 23, and buck converter 24, which constitute the power supply equipment 20. As shown in Figure 6, the power supply lid body 63 can be opened and closed to close the upper opening 62.

[0027] As shown in Figures 4 to 6, the low-voltage system housing box 70 is installed on the outside of the peripheral wall portion 51w of the frame 51. The low-voltage system housing box 70 comprises a low-voltage system box body 71 and a low-voltage system cover body 73. The low-voltage system box body 71 has a side opening 72 that opens to the side (outward) on one side in the width direction Dw. As shown in Figure 2, the low-voltage system box body 71 houses circuit boards and the like that constitute the main circuit section 32 and the relay circuit section 33 that constitute the low-voltage system equipment 30. As shown in Figure 4, the low-voltage system cover body 73 closes the side opening 72 in an openable and closable manner.

[0028] As shown in Figures 3 and 4, the frame 51, the high-voltage system housing 60 located inside the frame 51, and the low-voltage system housing 70 mounted on the outside of the frame 51 are all covered by a decorative panel 52.

[0029] As shown in Figure 2, one end of the power supply wiring 301A and 301B are connected to the boost converter 22 and AC-DC converter 23 inside the power supply housing box 60, respectively. The power supply wiring 301A and 301B are led out to the outside of the power supply housing box 60 and connected to the generator 101, battery 102, and commercial power supply 200. A contactor 25 and a noise filter 26 are provided on the power supply wiring 301B that is connected to the commercial power supply 200. Furthermore, one end of the output wiring 302 is connected to the inverter 21. The other end of the output wiring 302 is led out to the outside of the high-voltage system housing 60 and connected to the electric compressor 15 inside the unit body 50. One end of the power supply wiring 303 for supplying power to the controller 31 is connected to the step-down converter 24. The other end of the power supply wiring 303 is led out to the outside of the high-voltage system housing 60 and connected to the main circuit section 32 inside the low-voltage system housing 70.

[0030] Furthermore, the high-voltage system housing box 60 is equipped with a detection mechanism 65 (see Figure 6) and a shut-off means 66. The detection mechanism 65 is equipped with a sensor such as a limit switch that detects when the high-voltage system cover 63 is opened. The shut-off means 66 shuts off the application of DC high voltage DH to the high-voltage system equipment 20 when the sensor of the detection mechanism 65 detects that the high-voltage system cover 63 is open.

[0031] In this embodiment, as the interruption means 66, a switch 69 is provided inside the power supply side wiring 301A connecting the generator 101, battery 102, and boost converter 22 inside the power supply system housing box 60. As shown in Figure 7, the switch 69 automatically opens when the sensor of the detection mechanism 65 detects that the power supply system cover 63 has opened, interrupting the supply of DC low voltage DL to the boost converter 22 via the power supply side wiring 301A. In the power supply side wiring 301A and 301B in Figure 7, the thick lines indicate the portion where DC low voltage DL current is flowing, and the thin lines indicate the portion where no current is flowing. As a result, no current flows downstream of the switch 69 (on the boost converter 22 side). Furthermore, it is preferable to cover the connection terminals connected to the power supply side wiring 301A upstream of the switch 69 (on the generator 101 and battery 102 side) with a cover such as a finger protector. This prevents workers from inadvertently touching the section upstream of the switch 69 where the DC low-voltage DL flows.

[0032] Furthermore, as a cutting means 66, a cutting mechanism 25s of a contactor 25 provided on the power supply side wiring 301B connected to the commercial power supply 200 is provided. The cutting mechanism 25s of the contactor 25 cuts off the voltage supply to the downstream side (AC-DC converter 23 side) when the sensor of the detection mechanism 65 detects that the high-voltage system cover 63 has opened.

[0033] As the interruption means 66, the interruption mechanism 22s built into the boost converter 22 can also be used. The interruption mechanism 22s of the boost converter 22 interrupts the voltage supply to the downstream side (electric compressor 15 side) when the sensor of the detection mechanism 65 detects that the high-voltage system cover 63 has opened.

[0034] In such a vehicle refrigeration unit 10, for example, when performing maintenance such as updating the program for the main circuit section 32 of the low-voltage equipment 30, first, the decorative panel 52 of the unit body 50 is removed, and as shown in Figure 4, the low-voltage system cover 73 of the low-voltage system housing box 70 is exposed. Next, as shown in Figure 6, the low-voltage system cover 73 is opened to access the inside of the low-voltage system box 71 and perform the prescribed maintenance work. At this time, the power supply cover 63 of the power supply housing box 80 is kept closed. This prevents accidental contact with the power supply equipment 20 inside the power supply housing box 80 when performing maintenance on parts other than the power supply housing box 80.

[0035] (Effects and Benefits) In the above-described configuration of the vehicle refrigeration unit 10 and vehicle 1, the high-voltage electrical system housing box 60 is housed in the unit body 50 installed on the upper front 11ft of the container 11. As a result, workers cannot access the high-voltage electrical system housing box 60 containing the high-voltage electrical system equipment 20 without climbing to a high position on the container 11. Therefore, when performing maintenance on parts other than the high-voltage electrical system equipment 20, it is possible to prevent workers from inadvertently touching the high-voltage electrical system equipment 20 to which a DC high voltage DH is applied. Consequently, when performing maintenance on parts other than the high-voltage electrical system equipment 20, workers are not limited to those qualified to handle high voltage. Furthermore, there is no need to use special equipment or tools that can handle high voltage. As a result, maintenance can be performed easily and safely, improving maintainability and reducing maintenance costs.

[0036] Furthermore, the power supply housing box 60 is surrounded by a frame 51. Therefore, to access the power supply housing box 60, it is necessary to remove the decorative panel 52 of the unit body 50, which is located at a high position in the container 11, and then access it from above the frame 51. This also helps to prevent workers from inadvertently touching the power supply equipment 20, to which a DC high voltage DH is applied, when performing maintenance on parts other than the power supply equipment 20.

[0037] Furthermore, the power supply housing box 60 comprises a power supply housing body 61 having an upper opening 62 that opens upward, and a power supply lid 63 that can open and close the upper opening 62. As a result, in order to access the power system equipment 20 inside the power system housing box 60, it is necessary to open the power system cover 63 that closes the upper opening 62 of the power system box body 61. Therefore, when performing maintenance on parts other than the power system equipment 20, it is possible to more effectively prevent workers from inadvertently touching the power system equipment 20 to which a DC high voltage DH is applied.

[0038] Furthermore, the low-voltage equipment enclosure 70 is installed on the outside of the frame 51 and is covered by a decorative panel 52. As a result, the low-voltage equipment enclosure 70 is installed outside the frame 51 surrounding the high-voltage equipment enclosure 60. Therefore, when performing maintenance on the low-voltage equipment 30 housed in the low-voltage equipment enclosure 70, it is possible to prevent inadvertently touching the high-voltage equipment 20 inside the high-voltage equipment enclosure 60, which is surrounded by the frame 51. Consequently, when performing maintenance on parts other than the high-voltage equipment 20, it is possible to more effectively prevent workers from inadvertently touching the high-voltage equipment 20 to which a DC high voltage DH is applied.

[0039] Furthermore, the low-voltage system housing box 70 comprises a low-voltage system box body 71 having a side opening 72 that opens to the side, and a low-voltage system lid 73 that can open and close the side opening 72. As a result, to access the low-voltage equipment 30 inside the low-voltage equipment housing box 70, one only needs to remove the decorative panel 52 of the unit body 50 and then open the low-voltage equipment cover 73 that closes the side opening 72 of the low-voltage equipment housing body 71. Since the side opening 72 opens to the side, it is easy to access the low-voltage equipment 30 inside the low-voltage equipment housing box 70, improving maintainability.

[0040] Furthermore, the high-voltage system housing box 60 is equipped with a shut-off means 66 that shuts off the application of DC high voltage DH to the high-voltage system equipment 20 when the detection mechanism 65 detects that the high-voltage system cover 63 has been opened. As a result, when the detection mechanism 65 detects that the high-voltage lid 63 of the high-voltage housing box 60 has opened, the shut-off means 66 shuts off the application of the DC high voltage DH to the high-voltage equipment 20. This more effectively prevents workers from unnecessarily touching the DC high voltage DH applied to the high-voltage equipment 20.

[0041] (Other embodiments) Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design changes and the like that do not depart from the gist of this disclosure. For example, the low-voltage system enclosure 70 is provided on the unit body 50 where the high-voltage system enclosure 60 is located, but the low-voltage system enclosure 70 may be located at an appropriate location outside the unit body 50, for example.

[0042] Furthermore, in the above embodiment, the unit body 50 is positioned on the upper front part 11ft of the container 11, but this is not the only option. As shown in Figure 8, the unit body 50 may also be installed on the top surface 11t of the container 11.

[0043] <Note> The vehicle refrigeration unit 10 and vehicle 1 described in the embodiment can be understood, for example, as follows.

[0044] (1) The vehicle refrigeration unit 10 according to the first embodiment includes a box-shaped container 11 that can be mounted on the vehicle body 2, a refrigeration cycle 12 that includes at least an indoor heat exchanger 13 located inside the container 11 and an electric compressor 15 for compressing the refrigerant supplied to the indoor heat exchanger 13, a boost converter 22 that boosts the DC low voltage DL supplied from a low voltage DC power supply 100 located on the vehicle body 2 side to a DC high voltage DH, and a device electrically connected to the boost converter 22 that boosts the DC high voltage DH The system comprises: high-voltage electrical equipment 20 equipped with an inverter 21 that converts to AC high voltage AH; low-voltage electrical equipment 30 that is driven at a lower voltage than the high-voltage electrical equipment 20 and equipped with a controller 31 that controls the operation of the inverter 21; a high-voltage electrical equipment housing box 60 housing the high-voltage electrical equipment 20; a low-voltage electrical equipment housing box 70 housing the low-voltage electrical equipment 30; and a box-shaped unit body 50 installed on the upper front 11ft of the container 11, or on the top surface 11t of the container 11, and housing at least the high-voltage electrical equipment housing box 60.

[0045] In this vehicle refrigeration unit 10, at least the high-voltage electrical equipment housing box 60 is housed in the unit body 50, which is installed on the upper front 11ft of the container 11 or on the top surface 11t of the container 11. As a result, workers cannot access the high-voltage electrical equipment housing box 60 containing the high-voltage electrical equipment 20 without climbing to a high position on the container 11. Therefore, when maintaining parts other than the high-voltage electrical equipment 20, it is possible to prevent workers from inadvertently touching the high-voltage electrical equipment 20 to which a DC high voltage DH is applied. Consequently, when maintaining parts other than the high-voltage electrical equipment 20, workers are not limited to those qualified to handle high voltage. Furthermore, there is no need to use special equipment or tools that can handle high voltage. As a result, maintenance can be performed easily and safely, improving maintainability and reducing maintenance costs.

[0046] (2) The vehicle refrigeration unit 10 according to the second embodiment is the vehicle refrigeration unit 10 of (1), wherein the unit body 50 comprises a frame 51 formed to surround the periphery of the high-voltage system housing box 60 when viewed from above, and a decorative panel 52 that covers the frame 51 and the high-voltage system housing box 60.

[0047] As a result, the power supply housing box 60 is surrounded by the frame 51. Therefore, to access the power supply housing box 60, it is necessary to remove the decorative panel 52 of the unit body 50, which is located at a high position in the container 11, and then access it from above the frame 51. This also helps to prevent workers from inadvertently touching the power supply equipment 20, to which a DC high voltage DH is applied, when performing maintenance on parts other than the power supply equipment 20.

[0048] (3) The vehicle refrigeration unit 10 according to the third embodiment is the vehicle refrigeration unit 10 according to (2), wherein the high-voltage system housing box 60 comprises a high-voltage system box body 61 having an upper opening 62 that opens upward and housing the high-voltage system equipment 20 inside, and a high-voltage system cover 63 that can open and close the upper opening 62.

[0049] As a result, in order to access the power system equipment 20 inside the power system housing box 60, it is necessary to open the power system cover 63 that closes the upper opening 62 of the power system box body 61. Therefore, when performing maintenance on parts other than the power system equipment 20, it is possible to more effectively prevent workers from inadvertently touching the power system equipment 20 to which a DC high voltage DH is applied.

[0050] (4) The vehicle refrigeration unit 10 according to the fourth embodiment is the vehicle refrigeration unit 10 of (2) or (3), wherein the low-voltage system housing box 70 is installed on the outside of the frame 51 and is covered by the decorative panel 52.

[0051] As a result, the low-voltage equipment enclosure 70 is installed outside the frame 51 surrounding the high-voltage equipment enclosure 60. Therefore, when performing maintenance on the low-voltage equipment 30 housed in the low-voltage equipment enclosure 70, it is possible to prevent inadvertently touching the high-voltage equipment 20 inside the high-voltage equipment enclosure 60, which is surrounded by the frame 51. Consequently, when performing maintenance on parts other than the high-voltage equipment 20, it is possible to more effectively prevent workers from inadvertently touching the high-voltage equipment 20 to which a DC high voltage DH is applied.

[0052] (5) The vehicle refrigeration unit 10 according to the fifth embodiment is the vehicle refrigeration unit 10 of (4), wherein the low-voltage system housing box 70 comprises a low-voltage system box body 71 having a side opening 72 that opens to the side and housing the low-voltage system equipment 30 inside, and a low-voltage system cover 73 that can open and close the side opening 72.

[0053] As a result, to access the low-voltage equipment 30 inside the low-voltage equipment housing box 70, one only needs to remove the decorative panel 52 of the unit body 50 and then open the low-voltage equipment cover 73 that closes the side opening 72 of the low-voltage equipment housing body 71. Since the side opening 72 opens to the side, it is easy to access the low-voltage equipment 30 inside the low-voltage equipment housing box 70, improving maintainability.

[0054] (6) The vehicle refrigeration unit 10 according to the sixth embodiment is any one of the vehicle refrigeration unit 10 from (1) to (5), wherein the high-voltage system housing box 60 includes a detection mechanism 65 for detecting when the high-voltage system cover 63 is open, and a shut-off means 66 for shutting off the application of the DC high voltage DH to the high-voltage system equipment 20 when the detection mechanism 65 detects that the high-voltage system cover 63 is open.

[0055] As a result, when the detection mechanism 65 detects that the high-voltage lid 63 of the high-voltage housing box 60 has opened, the shut-off means 66 shuts off the application of the DC high voltage DH to the high-voltage equipment 20. This more effectively prevents workers from unnecessarily touching the DC high voltage DH applied to the high-voltage equipment 20. Examples of the interruption means 66 include switches and contactors provided in the circuit connected to the boost converter 22, and interruption mechanisms built into electrical components to which the DC high voltage DH is applied.

[0056] (7) The vehicle 1 according to the seventh embodiment comprises one of the vehicle refrigeration units 10 from (1) to (6), and a vehicle body 2 positioned in front of the container 11 and equipped with a cabin on which an occupant can board.

[0057] As a result, in a vehicle 1 equipped with the above-described vehicle refrigeration unit 10, when performing maintenance on parts other than the high-voltage electrical equipment 20, it is possible to prevent workers from inadvertently touching the high-voltage electrical equipment 20 to which a DC high voltage DH is applied. Consequently, maintenance can be performed easily and safely, improving maintainability and reducing maintenance costs. [Explanation of Symbols]

[0058] 1…Vehicle 2… Vehicle body 4…Chassis 4w…wheels 5…Cabin 5c... Cabin Controller 10... Vehicle Refrigeration Unit 11…Container 11a...Bottom plate 11b...Front wall 11c…back wall 11d…Side wall 11e... Top plate 11ft…upper front 11t…Top surface 12…Refrigeration cycle 13…Indoor heat exchanger 14...Outdoor heat exchanger 15… Electric compressor 17…Indoor heat exchange fan 18…Outdoor heat exchange fan 19…Indoor unit 20…High electrical equipment 21…Inverter 22... Boost converter 22s...cutoff mechanism 23…AC-DC converter 24... Step-down converter 25... Contactor 25s...cutoff mechanism 26... Noise filter 28...Communication Circuit Section 30...Light electrical equipment 31… Controller 32…Main circuit section 33…Relay circuit section 50... Unit body 51...frame 51a...bottom plate 51b…Rear plate 51c...Side plate 51d…Side plate 51e... Front panel 51k... Notch 51w...peripheral wall part 52… Decorative panel 52a... Top panel 52b…Front panel 52c... Side panel 52d... Side panel 60... High-voltage electrical equipment housing box 61...High electric box body 62…Top opening 63…High electric system lid body 65...Detection mechanism 66... ​​Blocking means 69... Switch 70... Low-voltage equipment enclosure 71…Low electric system box body 72...Side opening 73…Light electric system lid body 80... High-voltage electrical equipment housing box 100... Low-voltage DC power supply 101... Generator 102...Battery 200…Commercial power supply 301A...Power supply wiring 301B…Power side wiring 302…Output side wiring 303... Power supply wiring AD... AC High Voltage AH... Three-phase AC high voltage DH... DC High Voltage DL... DC Low Voltage Da... direction Dv…Vertical direction Dw... width direction

Claims

1. A box-shaped container that can be mounted on the vehicle body, A refrigeration cycle comprising at least an indoor heat exchanger located inside the container, and an electric compressor for compressing the refrigerant supplied to the indoor heat exchanger, A high-voltage power supply system comprising a boost converter that boosts the low DC voltage supplied from a low-voltage DC power supply located on the vehicle body to a high DC voltage, and an inverter electrically connected to the boost converter that converts the high DC voltage to a high AC voltage, Low-voltage equipment that is driven at a lower voltage than the aforementioned high-voltage equipment and includes a controller that controls the operation of the inverter, The above-mentioned high-voltage system equipment is housed in a high-voltage system housing box, A low-voltage system housing box containing the aforementioned low-voltage system equipment, The container comprises a box-shaped unit body installed on the upper front or top surface of the container, which houses at least the high-voltage system housing box, The unit body is, It is fixed to the vehicle body and has a frame formed to surround the perimeter of the high-voltage system housing box when viewed from above, A notch is formed in a part of the wall panel that constitutes the frame, and an outdoor heat exchanger is provided so as to cover the notch, and thus constitutes a part of the frame. Vehicle refrigeration unit.

2. The unit body is, The box further comprises a decorative panel covering the aforementioned high-voltage electrical system housing. The vehicle refrigeration unit according to claim 1.

3. The aforementioned high-voltage system housing box is A power system box having an upper opening that opens upward, and containing the power system equipment inside, The system includes a high-voltage system cover that can be opened and closed to close the upper opening. The vehicle refrigeration unit according to claim 2.

4. The low-voltage system housing is installed on the outside of the frame and is covered by the decorative panel. A vehicle refrigeration unit according to claim 2 or 3.

5. The aforementioned low-voltage system housing box is A low-voltage system enclosure having a side opening that opens to the side, and containing the low-voltage system equipment inside, The system includes a low-voltage cover that can be opened and closed to close the aforementioned side opening. The vehicle refrigeration unit according to claim 4.

6. The aforementioned high-voltage system housing box is A detection mechanism for detecting when the aforementioned high-voltage system cover is opened, The system includes a shut-off means for shutting off the application of the DC high voltage to the high-voltage equipment when the detection mechanism detects that the high-voltage system cover has been opened. The vehicle refrigeration unit according to claim 3.

7. A vehicle refrigeration unit according to any one of claims 1 to 6, A vehicle body positioned in front of the aforementioned container and equipped with a cabin on which a crew can board, A vehicle equipped with the following features.

Images