Transport refrigeration unit

Abstract

This transport refrigeration unit comprises: a casing that has a back-surface plate extending in the vertical direction; and a compressor that is accommodated within the casing, and has an oil reservoir part disposed inclined toward one side in the axial direction and for accumulating refrigeration machine oil. The axis of the compressor is inclined with respect to the back-surface plate such that the oil reservoir part is positioned therebelow.

Description

[Technical field]

[0001] The present disclosure relates to transport refrigeration units. [Background technology]

[0002] Patent Document 1 discloses a horizontal rotary compressor used in an automobile air conditioner and arranged horizontally. This compressor incorporates a rotary compression mechanism (compressor body), an electric motor, and a baffle plate in a cylindrical sealed container. The baffle plate divides the inside of the sealed container into an electric motor chamber in which the electric motor is housed, and a compressor chamber in which the rotary compression mechanism is housed. The compressor generates a pressure difference between the electric motor chamber and the compressor chamber, thereby suppressing the refrigeration oil in the compressor chamber from moving to the electric motor chamber. In addition, by setting the size of the gap between the baffle plate and the inner surface of the sealed container, the pressure difference between the electric motor chamber and the compressor chamber is increased, further suppressing the refrigeration oil from moving to the electric motor chamber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-147071 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the compressor described in Patent Document 1, depending on the vehicle posture, the electric motor may be located extremely low, and the movement of the refrigeration oil may not be sufficiently suppressed due to the pressure difference between the electric motor chamber and the compressor chamber. In other words, there is still room for improvement in terms of supplying a sufficient amount of refrigeration oil to the sliding parts in the compressor. In addition to the structure that creates a pressure difference between the motor chamber and the compressor chamber, the gap between the baffle plate and the inner surface of the sealed container must be set to an appropriate size, which causes a problem of the compressor structure becoming complicated.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a transport refrigeration unit that has a simple structure and is capable of sufficiently supplying refrigeration oil to sliding parts inside the compressor regardless of the position. [Means for solving the problem]

[0006] In order to solve the above problems, the transport refrigeration unit according to the present disclosure has a vertically extending and fixed to the front of the trailer. A casing having a back panel; biased towards the rear a compressor housed in the compressor and having an oil reservoir for storing refrigeration oil disposed biased toward one side in an axial direction; an electrical equipment box provided inside the casing and accommodating electrical equipment; The axis of the compressor is inclined with respect to the back plate so that the oil reservoir is located below the back plate. The oil tank extends in the front-rear direction and is inclined so that the oil tank is located on the rear side, and the upper surface of the electrical box is inclined downward toward the front. . Effect of the Invention

[0007] According to the transport refrigeration unit of the present disclosure, refrigeration oil can be sufficiently supplied to the sliding parts inside the compressor regardless of the position, with a simple structure. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a schematic configuration of a refrigerated vehicle equipped with a transport refrigeration unit according to an embodiment of the present disclosure. FIG. [Diagram 2] FIG. 2 is a perspective view of a refrigerator unit body according to an embodiment of the present disclosure. [Diagram 3] 2 is a diagram showing the interior of an indoor unit and a refrigerator unit main body according to an embodiment of the present disclosure as viewed from above. FIG. [Figure 4] 2 is a front view of the inside of a refrigerator unit main body according to an embodiment of the present disclosure. FIG. [Diagram 5] 2 is a right view of the inside of a refrigerator unit main body according to an embodiment of the present disclosure. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (Refrigerated vehicle) Hereinafter, a refrigerated vehicle 1 according to an embodiment of the present disclosure will be described with reference to Figs. 1 to 5 . As shown in FIG. 1, a refrigerated vehicle 1 includes a tractor 2, a trailer 3, and a transport refrigeration unit 7. In the following, the vertical direction is simply referred to as the "vertical direction", one of the directions perpendicular to the vertical direction is referred to as the "front-rear direction", and the direction perpendicular to the vertical direction and the front-rear direction is referred to as the "left-right direction". The running direction of the refrigerated vehicle 1 coincides with the front-rear direction. The front, rear, left, and right are defined based on the driver's seat of the refrigerated vehicle 1.

[0010] The tractor 2 includes a cab 4 as a driver's seat, and is driven by a traveling engine (not shown). The tractor 2 tows a trailer 3.

[0011] The trailer 3 comprises a trailer body 5 and a chassis 6 . The trailer body 5 is a box-shaped container supported from below by a chassis 6. The trailer body 5 extends in the front-rear direction. A space for accommodating cargo (not shown) is formed inside the trailer body 5. The trailer body 5 has a front wall 5a arranged on the tractor 2 side, a top wall 5b connected to the upper end of the front wall 5a, a left wall 5c connected to the left end of the front wall 5a and the left end of the top wall 5b, and a right wall 5d connected to the right end of the front wall 5a and the right end of the top wall 5b.

[0012] (Transport Refrigeration Unit) The transport refrigeration unit 7 has a refrigeration unit body 8 and an indoor unit 9. The refrigerator unit body 8 is disposed outside the trailer body 5. The refrigerator unit body 8 is fixed to the upper part of the front surface of the front wall 5a of the trailer body 5. As shown in Figs. 2 to 4, the refrigerator unit body 8 includes a casing 10, an accumulator 53, a compressor 51, a rear fixing part 71, a front fixing part 72, a fan 40, an outdoor heat exchanger 52, a receiver 54, an electrical box 20, and a heat sink 30. A space for accommodating devices constituting the refrigerator unit body 8 is formed inside the casing 10.

[0013] As shown in FIG. 3, the indoor unit 9 includes an expansion valve 55, an indoor heat exchanger 56, and an indoor fan 57. The cooling cycle 50 of the transport refrigeration unit 7 is made up of an accumulator 53, a compressor 51, an outdoor heat exchanger 52, a receiver 54, an expansion valve 55, an indoor heat exchanger 56, an indoor fan 57, and the like.

[0014] The accumulator 53 is housed in the casing 10. The accumulator 53 is connected to the indoor heat exchanger 56 in a state in which the accumulator 53 can receive the refrigerant that has passed through the indoor heat exchanger 56. The compressor 51 is provided inside the casing 10, and is connected to the accumulator 53. The compressor 51 compresses the gas phase refrigerant supplied from the accumulator 53.

[0015] The fan 40 is housed within the casing 10. The fan 40 takes in air into the casing 10 and expels the air within the casing 10 to the outside.

[0016] The outdoor heat exchanger 52 is housed in the casing 10. The outdoor heat exchanger 52 is connected to the compressor 51 in a state in which it can receive the refrigerant compressed by the compressor 51. The outdoor heat exchanger 52 is a condenser that cools and condenses the gas-phase refrigerant supplied from the compressor 51 by using outside air taken into the casing 10 by the fan 40. The gas-phase refrigerant supplied from the compressor 51 is changed to a liquid-phase refrigerant by the outdoor heat exchanger 52. The outdoor heat exchanger 52 is connected to the receiver 54 in a state in which it can supply the cooled refrigerant to the receiver 54.

[0017] The receiver 54 is housed in the casing 10. The receiver 54 temporarily stores the liquid-phase refrigerant supplied from the outdoor heat exchanger 52, and absorbs fluctuations in the flow rate of the refrigerant in the cooling cycle 50. The receiver 54 is connected to the expansion valve 55 in a state in which the stored liquid-phase refrigerant can be supplied.

[0018] The expansion valves 55 are housed within the trailer body 5. One expansion valve 55 is provided on the left side and one on the right side within the trailer body 5. The two expansion valves 55 are disposed in symmetrical positions when viewed from above, and have the same configuration. Below, of the two expansion valves 55, the left expansion valve 55 will be described, and a description of the right expansion valve 55 will be omitted.

[0019] The expansion valve 55 is disposed in the upper part (close to the top wall 5b) of the corner formed by the left wall 5c and the front wall 5a. The expansion valve 55 expands (reducing the pressure) the liquid-phase refrigerant supplied from the receiver 54. The expansion valve 55 is connected to the indoor heat exchanger 56 in a state in which the expanded liquid-phase refrigerant can be supplied to the indoor heat exchanger 56.

[0020] The indoor heat exchangers 56 are housed within the trailer body 5. One indoor heat exchanger 56 is provided on the left side and one on the right side within the trailer body 5. The two indoor heat exchangers 56 are disposed in symmetrical positions when viewed from above, and have the same configuration. Below, of the two indoor heat exchangers 56, the left indoor heat exchanger 56 will be described, and a description of the right indoor heat exchanger 56 will be omitted.

[0021] The indoor heat exchanger 56 is disposed near the expansion valve 55. The indoor heat exchanger 56 is an evaporator that exchanges heat between the air around the indoor heat exchanger 56 and the liquid-phase refrigerant supplied from the expansion valve 55, and evaporates the liquid-phase refrigerant. The gas-phase refrigerant supplied from the expansion valve 55 is changed to a liquid-phase refrigerant by the indoor heat exchanger 56. At this time, heat is absorbed by the refrigerant in the air around the indoor heat exchanger 56. In this manner, the air around the indoor heat exchanger 56 is cooled.

[0022] The indoor fans 57 are housed within the trailer body 5. One indoor fan 57 is provided on the left side and one on the right side within the trailer body 5. The two indoor fans 57 are disposed in symmetrical positions when viewed from above, and have the same configuration. Below, the left indoor fan 57 of the two indoor fans 57 will be described, and a description of the right indoor fan 57 will be omitted.

[0023] The indoor fan 57 is disposed near the indoor heat exchanger 56. The indoor fan 57 circulates the air cooled by the indoor heat exchanger 56 inside the trailer body 5, thereby cooling the inside of the trailer body 5.

[0024] (Details of the refrigeration unit) Hereinafter, the refrigerator unit body 8 will be described in detail with reference to Figs.

[0025] (Casing) As shown in Fig. 2 to Fig. 5, the casing 10 is formed in a cube shape. The casing 10 has a back plate 11 fixed to the front of the front wall 5a of the trailer body 5 and extending in the vertical direction, a front plate 12 arranged opposite the back plate 11 in the front-rear direction, a lower plate 13 connected to the lower ends of the back plate 11 and the front plate 12, an upper plate 14 connected to the upper end of the front plate 12 of the back plate 11, and a left plate 15 and a right plate 16 arranged opposite to each other in the left-right direction and connected to the back plate 11 and the front plate 12, the lower plate 13 and the upper plate 14. The casing 10 also has an intake port 19 that can introduce outside air into the inside. The intake port 19 has a cooling intake port 19a and a main intake port 19b.

[0026] The casing 10 is formed to be thin in the vertical direction. The casing 10 is formed so that the ratio of the height in the vertical direction to the width in the horizontal direction and the depth in the front-rear direction is, for example, 50% or less.

[0027] The lower plate 13 extends forward from the lower end of the back plate 11. The thickness direction of the lower plate 13 coincides with the up-down direction. The lower plate 13 is provided with a cooling inlet 19a that penetrates the lower plate 13 and introduces air into the casing 10.

[0028] The lower plate 13 is formed integrally with the rear plate 11 and is formed in an L-shape together with the rear plate 11 when viewed from the left-right direction. The lower plate 13, together with the rear plate 11, functions as a main frame that supports the contents inside the casing 10.

[0029] The thickness direction of the top plate 14 coincides with the up-down direction. The top plate 14 is provided with two exhaust ports 14a that penetrate the top plate 14 and exhaust air from the inside of the casing 10 to the outside. The two exhaust ports 14a are provided on the left and right sides of the top plate 14. The left exhaust port 14a is provided so as to face the cooling suction port 19a in the up-down direction. The exhaust ports 14a penetrate the top plate 14 in the up-down direction. The exhaust ports 14a are formed in a circular shape when viewed in the up-down direction.

[0030] The front panel 12 and the right panel 16 are provided with a main suction port 19b that introduces air into the casing 10. The main suction port 19b is L-shaped when viewed from the top-bottom direction, and extends continuously from the front panel 12 to the right panel 16. The main suction port 19b penetrates the front panel 12 and the right panel 16. A wire mesh is attached to the main suction port 19b (see FIG. 2).

[0031] The casing 10 described above accommodates an accumulator 53, a compressor 51, a receiver 54, an electrical box 20, a heat sink 30, an outdoor heat exchanger 52, and a fan 40. More specifically, the accumulator 53, the compressor 51, and the receiver 54 are provided in a space on the right side of the casing 10. The electrical box 20 and the heat sink 30 are provided in a space on the left side of the casing 10. In addition, the outdoor heat exchanger 52 is provided at a position facing the main suction port 19b in the casing 10, and the fan 40 is provided at a position facing the exhaust port 14a in the casing 10.

[0032] (Electrical box) The electrical equipment box 20 is arranged biased toward one side (left side) in the left-right direction in the casing 10. The electrical equipment box 20 is arranged between the cooling inlet 19a and the left exhaust port 14a. A space capable of accommodating various devices is formed inside the electrical equipment box 20. The electrical equipment box 20 accommodates electrical equipment (not shown) such as power sources such as inverters and converters, and power drive system components. The electrical equipment box 20 has a back plate 21 arranged opposite to the back plate 11 of the casing 10, a front plate 22 arranged opposite to the back plate 21 in the front-rear direction, a lower plate 23 connected to the lower ends of the back plate 21 and the front plate 22, an upper plate 24 connected to the upper end of the front plate 22 of the back plate 21, and a left plate 25 and a right plate 26 arranged opposite to each other in the left-right direction and connected to the back plate 21 and the front plate 22, the lower plate 23, and the upper plate 24.

[0033] The lower plate 23 is disposed in a state of being floated above the bottom plate 13 of the casing 10. The lower plate 23 is disposed so as to cover the cooling inlet 19a of the casing 10. The lower plate 23 is formed in a rectangular plate shape with the longitudinal direction being the front-rear direction.

[0034] Heat from the electrical equipment housed in the electrical equipment box 20 is transferred to the lower plate 23. For this reason, the lower surface of the lower plate 23 is provided in a position facing the cooling inlet 19a, and serves as a cooled surface 27 that is cooled by the air introduced into the casing 10 through the cooling inlet 19a being blown thereon.

[0035] The upper plate 24 is formed in a rectangular plate shape and is disposed so as to incline downward as it approaches the front.

[0036] The rear ends of the left plate 25 and the right plate 26 are fixed to the back plate 11 of the casing 10 by fixing members (not shown). The front ends of the left plate 25 and the right plate 26 are fixed to the bottom plate 13 of the casing 10 by fixing members (not shown).

[0037] (heat sink) 4 and 5, the heat sink 30 is provided so as to be sandwiched between the surface to be cooled 27 of the electrical box 20 and the cooling inlet 19a of the casing 10. The heat sink 30 has a cooling plate 31 and a plurality of fins 32. The cooling plate 31 is provided along the surface 27 to be cooled of the electrical box 20. The cooling plate 31 is fixed to the electrical box 20 with the upper surface in close contact with the surface 27 to be cooled.

[0038] The multiple fins 32 are arranged so as to protrude from the cooling plate 31 and extend along the cooling plate 31. The extending direction of the fins 32 coincides with the left-right direction.

[0039] (Compressor) The compressor 51 is disposed biased toward the other side (right side) in the left-right direction in the casing 10. The compressor 51 is also disposed biased toward the rear side in the front-rear direction in the casing 10. The compressor 51 is, for example, a rotary compressor. The compressor 51 is formed in a cylindrical shape. Inside the compressor 51, a space capable of accommodating various members constituting the compressor 51 is formed. Inside the compressor 51, an oil reservoir 51a, a compressor body 51b, and an electric motor 51c are accommodated. The axis of the compressor 51 extends linearly in one direction. Inside the compressor 51, the oil reservoir 51a is disposed biased toward one side of the axis O direction. Inside the compressor 51, the oil reservoir 51a, the compressor body 51b, and the electric motor 51c are disposed in this order in the direction from one side of the axis O to the other side. The axis O of the compressor 51 is inclined with respect to the back plate 11 of the casing 10 so that the oil reservoir 51a is located below. Therefore, the oil reservoir 51a is located below the compressor body 51b and the electric motor 51c.

[0040] An axis O of the compressor 51 extends in the front-rear direction and is inclined so as to be positioned upward as it approaches the front. The compressor 51 is disposed so that one side in the direction of the axis O, where the oil reservoir 51a is provided, is located rearward.

[0041] Refrigeration oil is stored in the oil reservoir 51a. The refrigeration oil is pumped up from the oil reservoir 51a and supplied to the compressor body 51b and the electric motor 51c. The electric motor 51c rotates around an axis O. The compressor body 51b has an eccentric part (not shown) connected to the electric motor 51c inside. The eccentric part of the compressor body 51b rotates around the axis O by the driving force of the electric motor 51c. As a result, a compression chamber that compresses the gas-phase refrigerant of the cooling cycle 50 (see FIG. 3) is formed in the compressor body 51b. In the compressor 51, sliding parts such as a compressor body 51b and an electric motor 51c are lubricated by refrigeration oil supplied from an oil reservoir 51a.

[0042] (Rear fixing part) The rear fixing portion 71 is provided at the rear of the compressor 51. The rear fixing portion 71 is provided between the compressor 51 and the bottom plate 13 of the casing 10. The rear fixing portion 71 fixes the compressor 51 to the bottom plate 13.

[0043] (Front fixed part) The front fixing portion 72 is provided at the front of the compressor 51. The front fixing portion 72 is provided between the compressor 51 and the bottom plate 13 of the casing 10. The front fixing portion 72 fixes the compressor 51 to the bottom plate 13 forward of the rear fixing portion 71.

[0044] (Outdoor heat exchanger) The outdoor heat exchanger 52 is provided between the electrical box 20 and the main suction port 19b. When viewed from the top-bottom direction, the outdoor heat exchanger 52 is formed in the same shape as the main suction port 19b. When viewed from the top-bottom direction, the outdoor heat exchanger 52 is formed, for example, in an L-shape. The outdoor heat exchanger 52 exchanges heat between the air introduced from the main suction port 19b and the refrigerant flowing through the cooling cycle 50.

[0045] The outdoor heat exchanger 52 is disposed so as to face across the main suction port 19b. The compressor 51 faces the main suction port 19b via the outdoor heat exchanger 52. Furthermore, the right side of the electrical box 20 faces the main suction port 19b via the outdoor heat exchanger 52.

[0046] (fan) The fan 40 is provided on the opposite side of the electrical box 20 to the surface 27 to be cooled. The fan 40 exhausts air inside the casing 10 to the outside. The fan 40 includes a first fan 41 arranged opposite the left exhaust port 14a of the two exhaust ports 14a of the casing 10, and a second fan 42 arranged opposite the right exhaust port 14a. The axial direction of the fan 40 coincides with the up-down direction.

[0047] The first fan 41 is provided on the opposite side of the electrical box 20 from the cooling inlet 19a. The second fan 42 faces the accumulator 53, the compressor 51, and the receiver 54.

[0048] (Action and effect) In the transport refrigeration unit 7 described above, air flows within the casing 10 as follows. As shown in FIGS. 4 and 5, when the fan 40 is operated, the air inside the casing 10 is discharged to the outside, and air is introduced into the casing 10 through the suction port 19.

[0049] The air introduced into the casing 10 from the cooling inlet 19a of the inlet 19 is blown onto the cooling plate 31 of the heat sink 30. The air blown onto the cooling plate 31 flows along the fins 32 and is guided to both ends of the cooling plate 31 in the left-right direction. The air guided to both ends of the cooling plate 31 in the left-right direction flows so as to bypass the electrical box 20. More specifically, the air flows along the left wall 5c or the right wall 5d of the electrical box 20, and then flows along the inclination of the upper plate 24 of the electrical box 20, and is sucked into the fan 40 arranged at the top of the casing 10. The air introduced into the casing 10 from the cooling inlet 19a and bypassing the electrical box 20 is sucked into the first fan 41 of the fans 40. The air sucked into the fan 40 is discharged to the outside of the casing 10 through the exhaust port 14a.

[0050] Furthermore, air introduced into the casing 10 from the main suction port 19b of the suction port 19 passes through the outdoor heat exchanger 52. The air that has passed through the outdoor heat exchanger 52 flows along the surface of the compressor 51 or the electrical box 20. The compressor 51 and the electrical box 20 are cooled by the air flowing along their surfaces. The air is then sucked into the fan 40 disposed at the top of the casing 10. The air sucked into the fan 40 is discharged outside the casing 10 through the exhaust port 14a.

[0051] In this embodiment, the oil reservoir 51a is disposed offset to one side in the direction of the axis O of the compressor 51. The axis O of the compressor 51 is inclined with respect to the back plate 11 of the casing 10 so that the oil reservoir 51a is located below.

[0052] This makes it possible to prevent the oil reservoir 51a from being located above the compressor 51 even if the casing 10 is tilted relative to the horizontal plane. That is, the oil reservoir 51a is located above the compressor body 51b and the electric motor 51c. This makes it possible to prevent the refrigeration oil stored in the oil reservoir 51a from flowing downward due to gravity, thereby making it possible to prevent the amount of oil stored in the oil reservoir 51a from decreasing.

[0053] For example, when the refrigerated vehicle 1 equipped with the transport refrigeration unit 7 is traveling, the attitude of the casing 10 is expected to constantly change due to the inclination of the road on which the refrigerated vehicle 1 is traveling. However, in this embodiment, by arranging the oil reservoir 51a below the compressor 51, even if the attitude of the casing 10 changes due to the operation of the refrigerated vehicle 1, it is possible to prevent the amount of oil stored in the oil reservoir 51a from decreasing. Therefore, with a simple structure in which the oil reservoir 51a is arranged below the compressor 51, it is possible to pump up refrigeration oil from the oil reservoir 51a regardless of the attitude of the casing 10. Therefore, it is possible to sufficiently supply refrigeration oil to the sliding parts such as the compressor body 51b and the electric motor 51c in the compressor 51 regardless of the attitude of the casing 10.

[0054] This allows the compressor 51 to be mounted as a horizontal compressor 51 arranged horizontally, making it possible to reduce the thickness of the casing 10 in the vertical direction. Therefore, when mounted on the outer surface of the trailer 3 as in this embodiment, it is possible to reduce the air resistance experienced by the casing 10 while the refrigerated vehicle 1 is traveling, while sufficiently supplying refrigeration oil to the sliding parts within the compressor 51.

[0055] In this embodiment, the axis O of the compressor 51 extends in the front-rear direction. The transport refrigeration unit 7 further includes a rear fixing part 71 that fixes the compressor 51 to the bottom plate 13 of the casing 10, and a front fixing part 72 that fixes the compressor 51 to the bottom plate 13 forward of the rear fixing part 71.

[0056] When the back plate 11 of the casing 10 is fixed to the front surface of the trailer 3, the casing 10 is supported by a cantilever. In this case, the bottom plate 13 of the casing 10 may bend due to the total load of the casing 10 and the contents therein. According to this embodiment, the compressor 51, the rear fixing part 71, the front fixing part 72 and the lower plate 13 are connected in an annular shape when viewed from the left-right direction, so that the compressor 51 can function as a strength member of the lower plate 13. Therefore, it is possible to prevent the lower plate 13 of the casing 10 from bending. Therefore, it is possible to further improve the strength of the casing 10.

[0057] In addition, since the axis O of the compressor 51 extends in the front-rear direction, the compressor 51 is disposed so as to extend in the traveling direction of the refrigerated vehicle 1. Therefore, the oil reservoir 51a in the compressor 51 can more appropriately maintain a lower position in the compressor 51 in response to changes in the attitude of the casing 10 caused by the traveling of the refrigerated vehicle 1.

[0058] In this embodiment, the compressor 51 is disposed biased toward the rear side in the front-rear direction within the casing 10. Furthermore, the compressor 51 is disposed such that the axis O extends in the front-rear direction, and one side in the direction of the axis O where the oil reservoir 51a is provided is located rearward. Since the oil reservoir 51a stores refrigeration oil, it tends to be heavier than other parts of the compressor 51. Therefore, according to this embodiment, the center of gravity of the compressor 51 can be brought closer to the back plate 11 of the casing 10. This can further prevent the casing 10 from bending downward when the casing 10 is supported by the back plate 11 in a cantilever manner.

[0059] In this embodiment, the electrical equipment box 20 is disposed offset to the left side within the casing 10, and the compressor 51 is disposed offset to the right side. The electrical equipment box 20 and the compressor 51 face the main suction port 19b with the outdoor heat exchanger 52 interposed therebetween.

[0060] As a result, the air that has been introduced into the casing 10 and has exchanged heat with the refrigerant by the outdoor heat exchanger 52 can be used to cool the electrical box 20 and the compressor 51. This improves the cooling performance of the electrical box 20 and the compressor 51.

[0061] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included. In the above embodiment, the compressor 51 is, for example, a rotary compressor, but the present invention is not limited to this and may be, for example, a scroll compressor.

[0062] In the above embodiment, the oil reservoir 51a, the compressor body 51b, and the electric motor 51c are arranged in this order in the compressor 51 in the direction from one side of the axis O to the other side, but this is not limited to the above. The oil reservoir 51a only needs to be located below sliding parts such as the compressor body 51b and the electric motor 51c. For example, the oil reservoir 51a, the electric motor 51c, and the compressor body 51b may be arranged in this order in the direction from one side of the axis O to the other side. In other words, the compressor body 51b may be arranged above the electric motor 51c.

[0063] In the above embodiment, the axis O of the compressor 51 extends in the front-rear direction and is inclined upward toward the front, but this is not limited thereto. For example, the axis O of the compressor 51 may be inclined so as to be positioned downward toward the front. In this case, the compressor 51 is disposed so that one side in the direction of the axis O, where the oil reservoir 51a is provided, is positioned forward.

[0064] In the above embodiment, the compressor 51 faces the main suction port 19b via the outdoor heat exchanger 52, and the right side of the electrical box 20 faces the main suction port 19b via the outdoor heat exchanger 52, but this is not limited to the above. Only one of the compressor 51 and the outdoor heat exchanger 52 may be provided to face the main suction port 19b via the outdoor heat exchanger 52.

[0065] <Additional Notes> The transport refrigeration unit 7 described in each embodiment can be understood, for example, as follows.

[0066] (1) The transport refrigeration unit 7 of the first embodiment comprises a casing 10 having a rear panel 11 extending in the vertical direction, and a compressor 51 housed within the casing 10 and having an oil reservoir 51a for storing refrigeration oil arranged biased toward one side in the direction of an axis O, and the axis O of the compressor 51 is inclined relative to the rear panel 11 so that the oil reservoir 51a is located downward.

[0067] This makes it possible to prevent the oil reservoir 51a from being positioned above the compressor 51, even if the transport refrigeration unit 7 is tilted relative to the horizontal plane. Therefore, the refrigeration oil stored in the oil reservoir 51a can be prevented from flowing downward due to gravity, making it possible to prevent the amount of oil stored in the oil reservoir 51a from becoming reduced.

[0068] (2) A transport refrigeration unit 7 according to a second aspect is the transport refrigeration unit 7 of (1), wherein the rear panel 11 is fixed to the front surface of the trailer 3, the casing 10 further has a bottom panel 13 extending forward from the lower end of the rear panel 11, and the axis O of the compressor 51 extends in the fore-and-aft direction, and may further include a rear fixing portion 71 that fixes the compressor 51 to the bottom panel 13, and a front fixing portion 72 that fixes the compressor 51 to the bottom panel 13 forward of the rear fixing portion 71.

[0069] When the back plate 11 of the casing 10 is fixed to the front surface of the trailer 3, the casing 10 is supported by a cantilever. In this case, the bottom plate 13 of the casing 10 may bend due to the total load of the casing 10 and the contents therein. According to this embodiment, when viewed from the left-right direction, the compressor 51, the rear fixing portion 71, the front fixing portion 72 and the lower panel 13 are connected in a ring shape, so that the compressor 51 can function as a strength member of the lower panel 13.

[0070] (3) A transport refrigeration unit 7 according to a third aspect is the transport refrigeration unit 7 of (1) or (2), further comprising an outdoor heat exchanger 52 disposed opposite the suction port 19 in the casing 10 and an electrical box 20 disposed inside the casing 10 and housing electrical equipment, wherein the electrical box 20 is positioned offset to one side in the left-right direction and the compressor 51 is positioned offset to the other side in the left-right direction, and at least one of the electrical box 20 and the compressor 51 faces the suction port 19 via the outdoor heat exchanger 52.

[0071] This allows the air that has been introduced into the casing 10 and has exchanged heat with the refrigerant by the exterior heat exchanger 52 to be used to cool at least one of the electrical box 20 and the compressor 51. [Industrial Applicability]

[0072] The present disclosure relates to a transport refrigeration unit that can supply refrigeration oil sufficiently to sliding parts in a compressor regardless of the position with a simple structure. [Explanation of symbols]

[0073] 1...refrigerated vehicle 2...tractor 3...trailer 4...cab 5...trailer body 5a...front wall 5b...top wall 5c...left wall 5d...right wall 6...chassis 7...transport refrigeration unit 8...refrigeration unit body 9...indoor unit 10...casing 11...rear panel 12...front panel 13...lower panel 14...upper panel 14a...exhaust port 15...left panel 16...right panel 19...suction port 19a...cooling suction port 19b...main suction port 20...electrical box 21...rear panel 22...front panel 23...lower panel 24...upper panel 25...left panel 26...right panel 27...cooled surface 30...heat sink 31...cooling plate 31a...fin-free area 32...fin 40...fan 41...first fan 42... Second fan 50... Cooling cycle 51... Compressor 51a... Oil reservoir 51b... Compressor body 51c... Motor 52... Outdoor heat exchanger 53... Accumulator 54... Receiver 55... Expansion valve 56... Indoor heat exchanger 57... Indoor fan 71... Rear fixed portion 72... Front fixed portion O... Axis

Claims

1. A casing having a back plate extending in the vertical direction and fixed to the front surface of the trailer; a compressor that is accommodated in the casing toward the rear side and has an oil reservoir for storing refrigeration oil disposed toward one side in an axial direction; an electrical equipment box provided inside the casing and accommodating electrical equipment; Equipped with The axis of the compressor is inclined with respect to the rear plate so that the oil reservoir is located downward, and extends in the front-rear direction and is inclined so that the oil reservoir is located on the rear side, a top surface of the electrical box inclined downward toward the front,

2. The casing comprises: The device further includes a lower panel extending forward from a lower end of the rear panel, a rear fixing portion that fixes the compressor to the lower plate; a front fixing portion that fixes the compressor to the lower plate forward of the rear fixing portion; The transport refrigeration unit of claim 1 further comprising:

3. The casing is formed with a suction port, Further, an outdoor heat exchanger is provided so as to face the air inlet, The electrical equipment box is disposed biased toward one side in the left-right direction, The compressor is disposed offset toward the other side in the left-right direction, 3. The transport refrigeration unit according to claim 1, wherein at least one of the electrical component box and the compressor faces the suction port with the exterior heat exchanger interposed therebetween.

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