WO2017082044A1

WO2017082044A1 - Refrigeration unit

Info

Publication number: WO2017082044A1
Application number: PCT/JP2016/081605
Authority: WO
Inventors: 健渡邉
Original assignee: 株式会社デンソー
Priority date: 2015-11-12
Filing date: 2016-10-25
Publication date: 2017-05-18
Also published as: JP2017089987A

Abstract

A refrigeration unit (400) is provided with: a frame (420); a shield member (430) affixed to the frame (420); a cooling device (440) disposed on one side surface side of the shield member (430) and performing cooling while circulating a refrigerant; and an evaporator (450) disposed on the other side surface side of the shield member (430) and being a heat exchanger for cooling air using a refrigerant supplied from the cooling device (440). At least a part of the cooling device (440) is affixed to the shield member (430).

Description

Refrigeration unit

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2015-221761 filed on November 12, 2015, and claims the benefit of its priority. Which is incorporated herein by reference.

This disclosure relates to a refrigeration unit that is attached so as to shield an opening formed in a container box from the outside and cools the air inside.

A so-called “refrigerated container” is known as a form of transport container that contains cargo inside and is transported by trailer or aircraft. A reefer container is a container in which the inside of a box-like container box is maintained at a target temperature and target humidity. The temperature of fresh food, frozen food, fresh flowers, chemical products, pharmaceuticals, electronic parts, films, artworks, etc. It is widely used for long-distance transportation of cargo that requires control of humidity and humidity.

Patent Document 1 below describes a refrigeration unit that cools the air inside a container box. The refrigeration unit includes a large number of devices that cool air, such as an evaporator. The refrigeration unit is attached so as to shield an opening formed in the container box from the outside, and cools while circulating the air in the container box.

US Patent Application Publication No. 2015/0202945

In such a refrigeration unit, a skeleton is generally formed by using a large number of frames that are pipe-shaped members. The frame is fixed to the outer surface of the container box, so that the refrigeration unit is attached to the container box. In addition, a large number of devices that cool the air described above are fixed to the frame.

In order to reduce the size and weight of the refrigeration unit, it is preferable to use as few frames as possible. However, as a result of detailed studies by the inventor, it has been found that if the number of frames is reduced, the rigidity of the refrigeration unit is lowered, and it is difficult to secure a fixed portion of the device.

This disclosure is intended to provide a refrigeration unit that can secure the fixing portion and rigidity of the cooling device while reducing the number of frames to be used.

A refrigeration unit according to one aspect of the present disclosure is a refrigeration unit that is attached so as to shield an opening formed in a container box from the outside and cools air inside the frame, and includes a frame and a shielding member fixed to the frame And a cooling device that is arranged on one side of the shielding member and cools the refrigerant while circulating it, and is arranged on the other side of the shielding member and cools the air using the refrigerant supplied from the cooling device A heat exchanger. At least a part of the cooling device is fixed to the shielding member.

According to the above configuration, at least a part of the cooling device is fixed to the shielding member. Accordingly, the opening formed in the container box is shielded by the shielding member, and the cooling device is fixed, so that it is possible to secure the fixing portion and rigidity of the cooling device while reducing the number of frames to be used. .

In the present application, “freezing” is not limited to the meaning of cooling the air until the cargo in the container box is frozen. That is, so-called “refrigeration” in which air is cooled in a range where the cargo does not freeze is included in the meaning of “freezing” in the present application.

According to the present disclosure, it is possible to provide a refrigeration unit capable of securing the fixing portion and rigidity of the cooling device while reducing the number of frames to be used.

FIG. 1 is a schematic diagram illustrating a refrigeration unit and the like according to the embodiment. FIG. 2 is an exploded view showing the refrigeration unit and the like of FIG. FIG. 3 is a front view showing the main body of the refrigeration unit of FIG. FIG. 4 is a cross-sectional view showing a IV-IV cross section of FIG.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

First, an outline of the refrigeration unit 400 according to the embodiment will be described. As shown in FIG. 1, the refrigeration unit 400 constitutes a part of the refrigeration container 200 transported by the trailer 100. The refrigerated container 200 is loaded on a towed vehicle 120 towed by a towed vehicle 110 of the trailer 100. The refrigeration container 200 includes a container box 300 and a refrigeration unit 400.

The container box 300 is a rectangular parallelepiped container whose outer shape is formed of a metal material such as steel or aluminum. In the container box 300, a space for accommodating cargo is formed. The outer dimensions of the container box 300 may be determined by a standard, but are not particularly limited in the present disclosure. Since this container box 300 is used for the refrigerated container 200, a heat insulating material (not shown) having heat insulating performance is disposed inside. The heat insulating material protects the cargo in the container box 300 from temperature changes in the external environment.

As shown in FIG. 2, an opening 320 is formed in a part near the upper end of the front wall 311 constituting the container box 300. The opening 320 has a rectangular shape and is formed so as to penetrate the front wall 311 in the front-rear direction.

For ease of understanding, in this specification, in the state where the refrigeration unit 400 is attached to the container box 300, the forward direction of the trailer 100 shown in FIG. Will be described. Further, the left-right direction when the trailer 100 is directed forward is referred to as “left” or “right”. Further, the description will be made by referring to the vertical upward direction as “up” and the vertical downward direction as “down”.

The refrigeration unit 400 is a device that cools the air in the container box 300. The refrigeration unit 400 is attached to the front surface 312 of the front wall 311 constituting the container box 300. The refrigeration unit 400 includes a main body 410 and a cover 490.

The main body 410 is a part on which the functional parts of the refrigeration unit 400 are mounted. As shown in FIG. 3, the main body 410 includes a frame 420, a shielding member 430, a cooling device 440, and a hood 460. Furthermore, the main body 410 includes an evaporator 450 (heat exchanger) as shown in FIG. In FIG. 2, illustration of a part of the cooling device 440 is omitted.

The frame 420 is a pipe-shaped member having a rectangular cross section. The frame 420 is configured by welding a plurality of pipe-shaped members, and forms a skeleton of the main body 410. The frame 420 includes a frame-shaped frame 421 and a space forming frame 423.

The frame-shaped frame 421 is a portion formed in a rectangular frame shape as a whole. The frame-like frame 421 includes

side frames

421a and 421a provided on the left and right, an upper frame 421b provided on the upper side, and a lower frame 421c provided on the lower side. The

side frames

421a and 421a, the upper frame 421b, and the lower frame 421c are provided so as to form a rectangular space therein. The rectangular space is formed larger than the opening 320 of the container box 300.

The space forming frame 423 is a portion formed below one side of the frame-like frame 421. The space forming frame 423 shares the

side frames

421a and 421a with the frame frame 421 described above. That is, the

side frames

421a and 421a are used as part of the space forming frame 423 by extending downward.

The space forming frame 423 includes a front frame 423a, an inclined frame 423b, and a reinforcing frame 423c in addition to the

side frames

421a and 421a. The front frame 423a is a portion that is disposed on the front side away from the

side frames

421a and 421a and is formed in a rectangular frame shape as a whole. The front frame 423a is formed so that the horizontal dimension thereof is smaller than the dimension between the side frames 421a and 421a, and is positioned between the side frames 421a and 421a in a front view. The inclined frame 423b extends from the four corners of the front frame 423a so as to be inclined toward the side frames 421a and 421a. A plurality of reinforcing frames 423c are arranged between the side frames 421a and 421a, and have a function of improving the rigidity so as to maintain the interval between the side frames 421a and 421a. Since the space forming frame 423 has such a configuration, an accommodation space 425 having a predetermined volume is formed in front of the side frames 421a and 421a.

The shielding member 430 is a member fixed to the frame 420. The shielding member 430 is made of a resin material having high heat insulating performance as compared with steel and aluminum constituting the container box 300. The shielding member 430 is a lightweight member while having high rigidity by disposing glass fiber (not shown) therein.

The shielding member 430 is fixed to the frame-like frame 421 of the frame 420. Specifically, the periphery of the shielding member 430 is fixed to the side frames 421a and 421a, the upper frame 421b, and the lower frame 421c of the frame-like frame 421 by fastening using screws (not shown).

The projection member 431 and the

non-projection parts

432 and 432 are formed on the shielding member 430. The protruding portion 431 is formed on the front side so as to protrude into the frame-shaped frame 421. The

non-projecting portions

432 and 432 are formed at portions on both the left and right sides of the projecting portion 431 and near the upper frame 421b. The

non-projecting parts

432 and 432 are formed flat without projecting. Between the protrusion part 431 and the non-protrusion part 432,432, the connection surface 433,433 which connects both is formed.

The cooling device 440 is a device that cools the refrigerant while circulating it in a circulation channel (not shown). The cooling device 440 includes an engine 441 shown in FIG. 3, a compressor 443 (pressure device),

condensers

444 and 444,

fan motors

445 and 445, a standby motor 446, and a generator 448. Yes.

Engine 441 is, for example, a reciprocating engine that uses gasoline as fuel. The engine 441 is disposed in the housing space 425 of the space forming frame 423, and is fixed to the front frame 423a and the reinforcing frame 423c by fastening using screws (not shown). The engine 441 has a plurality of cylinders (not shown). Each cylinder generates torque by repeatedly performing each stroke of an intake stroke, a compression stroke, a combustion stroke, and an exhaust stroke. The torque is output via a crankshaft (not shown) that the engine 441 has. Combustion gas generated in the combustion stroke of each cylinder is discharged from the engine 441 to the outside of the accommodation space 425 through the exhaust duct 442.

The compressor 443 is a fluid machine provided in the circulation channel. The compressor 443 is disposed in the accommodating space 425 of the space forming frame 423 and is fixed to the front frame 423a and the reinforcing frame 423c by fastening using screws (not shown). The compressor 443 is connected to the crankshaft of the engine 441, and is driven by receiving the output of the engine 441 via the crankshaft. When the compressor 443 is driven, the refrigerant in the circulation flow path is compressed and supplied to the downstream side of the compressor 443.

The

condensers

444 and 444 are heat exchangers provided on the downstream side of the compressor 443 in the circulation flow path. The

condensers

444 and 444 are heat exchangers of the same type. The

capacitors

444 and 444 are all fixed to the protruding portion 431 of the shielding member 430 via

fasteners

444a and 444a by fastening using screws (not shown). The

capacitors

444 and 444 are arranged at a predetermined interval from the protruding portion 431 so that air can flow on the outer surface thereof. That is, the

fixtures

444a and 444a function as a spacer that fixes the

capacitors

444 and 444 to the protruding portion 431 and forms a space between the

capacitors

444 and 444 and the protruding portion 431.

Further, the

capacitors

444 and 444 each have a flow path (not shown) through which a refrigerant flows. The refrigerant compressed by the compressor 443 is first supplied to the flow path in one capacitor 444. The refrigerant flowing through the flow path in the capacitor 444 is cooled by exchanging heat with the air flowing through the outer surface of the capacitor 444. The refrigerant discharged from one capacitor 444 is then supplied to the flow path in the other capacitor 444 and exchanges heat with air in the same manner as when flowing through the flow path in one capacitor 444.

The

fan motors

445 and 445 are air blowers that suck and blow out air.

Fan motors

445 and 445 are fixed to non-projecting portion 432 and connecting surface 433 of shielding member 430 by fastening using screws (not shown).

Fan motors

445 and 445 discharge the air that has passed through the outer surfaces of

capacitors

444 and 444 to the outside of main body 410.

The standby motor 446 is disposed in the accommodating space 425 of the space forming frame 423, and is fixed to the front frame 423a and the reinforcing frame 423c by fastening using screws (not shown). The output shaft of the standby motor 446 is connected to the compressor 443 by a belt (not shown). When the standby motor 446 is connected to a commercial power source (not shown) at a place where the trailer 100 is parked, the standby motor 446 is driven by electric power supplied from the commercial power source. When the standby motor 446 is driven, the output is transmitted to the compressor 443 through the belt, and the compressor 443 is driven. Thus, even when the engine 441 is not in operation, the compressor 443 can be driven to compress and circulate the refrigerant.

The generator 448 is disposed in the housing space 425 of the space forming frame 423 and is fixed to the front frame 423a and the reinforcing frame 423c by fastening using screws (not shown). The generator 448 is driven by receiving an output through the compressor 443 during operation of the engine 441 to generate electric power. The electric power generated by the generator 448 is stored in a battery 447 that is a secondary battery. The electric power stored in the battery 447 can be used to drive the standby motor 446 and the

fan motors

445 and 445 by supplying them.

As shown in FIG. 4, the evaporator 450 is a heat exchanger disposed on the opposite side of the condenser 444 (in other words, behind the shielding member 430) with the shielding member 430 interposed therebetween. The evaporator 450 is fixed to the protruding portion 431 of the shielding member 430 by fastening using a screw (not shown). The evaporator 450 has a flow path (not shown) through which a refrigerant flows. The evaporator 450 is configured to receive the supply of the liquid refrigerant that has passed through the

capacitors

444 and 444 and to flow the refrigerant through the internal flow path.

A motor 451 is disposed above the evaporator 450. The motor 451 is fixed to the protruding portion 431 of the shielding member 430 by fastening using a screw (not shown). When the motor 451 is driven, the fan 452 fixed to the output shaft of the motor 451 rotates, and air is sucked and blown out. The air sucked by the fan 452 passes through the outer surface of the evaporator 450 and exchanges heat with the refrigerant flowing through the flow path in the evaporator 450. Air is cooled by evaporating the liquid refrigerant in the evaporator 450.

As shown in FIG. 4, the hood 460 is a member that covers the rear side of the shielding member 430 and forms a space for accommodating the evaporator 450 and the motor 451 between the shielding member 430. A suction port 461 penetrating in the vertical direction is formed on the lower surface of the hood 460. Further, an air outlet 462 that penetrates in the front-rear direction is formed on the side surface of the hood 460.

The cover 490 is a member arranged on the front side of the main body 410 as shown in FIGS. 1 and 2. The cover 490 is formed of a hard resin material, and is fixed to the frame 420 so as to cover the front surface of the main body 410. Specifically, a plurality of hinges (not shown) are provided on a part of the side surface of the frame 420, and the cover 490 is fixed to the hinges to cover the front surface of the main body 410 so as to be opened and closed.

As shown in FIG. 2, a grill 491 is formed in a part near the upper end of the cover 490. Grill 491 is formed in cover 490 at a position corresponding to

capacitors

444 and 444 of main body 410. When the trailer 100 travels, air is supplied to the

condensers

444 and 444 through the grill 491.

Next, the attachment of the refrigeration unit 400 configured as described above to the container box 300 and the cooling of the air in the container box 300 by the refrigeration unit 400 will be described.

As described above, the refrigeration unit 400 is attached to the front wall 311 of the container box 300. Specifically, in the refrigeration unit 400, the side frames 421a and 421a, the upper frame 421b, and the lower frame 421c of the frame 420 are fixed to the front surface 312 of the front wall 311 by fastening using screws (not shown). .

As shown in FIG. 4, when the frame 420 is fixed to the front surface 312 of the front wall 311, the frame-like frame 421 of the frame 420 is disposed so as to surround the opening 320 formed in the front wall 311. . Thereby, the shielding member 430 is disposed so as to shield the opening 320 from the outside. Further, the hood 460 is inserted into the opening 320, and a part thereof is disposed so as to protrude from the front wall 311 into the container box 300.

When the engine 441 is driven with the refrigeration unit 400 attached to the container box 300 in this way, the compressor 443 that receives the output of the engine 441 is driven. The refrigerant compressed by the compressor 443 becomes high pressure and high temperature, and is supplied to the

capacitors

444 and 444 through the circulation channel.

The air taken in from the grill 491 of the cover 490 as the trailer 100 travels flows on the outer surfaces of the

capacitors

444 and 444. The refrigerant flowing in the flow paths in the

capacitors

444 and 444 is cooled by heat exchange with the air and the temperature is lowered, and then supplied to the evaporator 450 through the circulation flow path. The circulation channel is provided so as to connect the capacitor 444 and the evaporator 450 by penetrating a part of the protrusion 431 of the shielding member 430.

When the fan 452 disposed above the evaporator 450 rotates, as shown in FIG. 4, the air in the container box 300 is sucked through the suction port 461 of the hood 460 as indicated by the arrow Fin. When the sucked air passes through the outer surface of the evaporator 450, it is cooled by exchanging heat with a low-temperature refrigerant flowing through the flow path in the evaporator 450. The air that has passed through the outer surface of the evaporator 450 and has reached a low temperature is blown out by the fan 452 and returned to the container box 300 from the outlet 462 of the hood 460 as indicated by the arrow Fout. In this way, the air in the container box 300 is cooled by being circulated through the refrigeration unit 400.

On the other hand, the air exchanged with the refrigerant in the

condensers

444 and 444 is sucked by the non-projecting portions 432 of the shielding member 430 and the

fan motors

445 and 445 fixed to the connecting surface 433 and discharged to the outside of the main body 410. . That is, the air that has passed through the outer surfaces of the

capacitors

444 and 444 passes through the space defined by the non-projecting portion 432 and the connecting surface 433 of the shielding member 430 and is discharged outside the main body 410.

As described above, in the refrigeration unit 400, the

capacitors

444 and 444 that are a part of the cooling device 440 are fixed to the shielding member 430. Accordingly, the opening 320 formed in the container box 300 is shielded by the shielding member 430 and the

capacitors

444 and 444 are fixed to reduce the frame to be used. It becomes possible to secure.

In the refrigeration unit 400, the frame 420 has a frame-like frame 421 formed in a frame shape. The periphery of the shielding member 430 is fixed to the frame-shaped frame 421. As a result, the frame-like frame 421 is disposed so as to surround the opening 320 and the opening 320 can be shielded by the shielding member 430. As a result, the frame 420 can be securely fixed to the container box 300 around the opening 320. Further, the shielding using the shielding member 430 can prevent the cooled air in the container box 300 from flowing out of the opening 320. Furthermore, it is possible to suppress a situation in which heat generated when the engine 441 or the like that is a part of the cooling device 440 is driven is transferred into the container box 300 through the opening 320 and air cooling is hindered. .

Also, in the refrigeration unit 400, the frame 420 has a space forming frame 423 that forms an accommodation space 425 such as the compressor 443 that is a part of the cooling device 440 on one side of the frame-shaped frame 421. Accordingly, the compressor 443 having a relatively large weight can be accommodated in the accommodating space 425 and firmly fixed at a plurality of locations of the space forming frame 423. Further, by attaching the refrigeration unit 400 to the container box 300 so that the space forming frame 423 is positioned below the frame-like frame 421, the compressor 443 and the like can be disposed on the lower side. As a result, it is possible to lower the center of gravity of the refrigeration unit 400 and contribute to stable transportation by the trailer 100 or the like.

In the refrigeration unit 400, the cooling device 440 includes a compressor 443 that is a pressurizing device that pressurizes the refrigerant. The compressor 443 is disposed in the accommodation space 425. Thus, by arranging the compressor 443 in the accommodation space 425, the compressor 443 can be firmly fixed at a plurality of locations of the space forming frame 423. Thereby, it is possible to increase the rigidity of the refrigeration unit 400 and suppress the influence of vibration generated when the compressor 443 is driven. Further, by attaching the refrigeration unit 400 to the container box 300 so that the space forming frame 423 is positioned below the frame-like frame 421, the compressor 443 and the like can be disposed on the lower side. As a result, it is possible to arrange the compressor 443 or the like having a high maintenance frequency at a position that can be easily reached by a maintenance worker.

Further, in the refrigeration unit 400, the shielding member 430 has a protruding portion 431 formed to protrude forward on one side.

Capacitors

444 and 444 that are a part of the cooling device 440 are fixed to the protruding portion 431. Since the shielding member 430 has such a projecting portion 431, the refrigeration unit 400 can be prevented from projecting into the container box 300, and the space in the container box 300 can be used effectively. Further, the protrusions 431 can fix the

capacitors

444 and 444 without causing interference with the frame-shaped frame 421. That is, according to the shielding member 430, it is possible to achieve both the effective use of the space in the container box 300 and the fixing of the

capacitors

444 and 444.

Further, in the refrigeration unit 400, the shielding member 430 has a non-projecting part 432 formed flat on the side of the projecting part 431. Such a non-protruding portion 432 forms a predetermined space in the refrigeration unit 400 and allows air that has passed through the

capacitors

444 and 444 to be smoothly discharged outside through the space. As a result, it is possible to prevent a situation in which the air that has passed through the

condensers

444 and 444 stays in the refrigeration unit 400 and the heat exchange in the

condensers

444 and 444 is hindered. Further, connecting

surfaces

433 and 433 are formed between the projecting portion 431 and the non-projecting portion 432, and the connecting

surfaces

433 and 433 can be used for fixing the

fan motors

445 and 445.

The embodiment has been described above with reference to specific examples. However, the present disclosure is not limited to these specific examples. Those in which those skilled in the art appropriately modify the design of these specific examples are also included in the scope of the present disclosure as long as they have the features of the present disclosure. Each element included in each of the specific examples described above and their arrangement, conditions, shape, and the like are not limited to those illustrated, and can be changed as appropriate. Each element included in each of the specific examples described above can be appropriately combined as long as no technical contradiction occurs.

Claims

A refrigeration unit (400) which is attached so as to shield the opening (320) formed in the container box (300) from the outside and cools the air inside,
A frame (420);
A shielding member (430) fixed to the frame;
A cooling device (440) disposed on one side of the shielding member for cooling while circulating the refrigerant;
A heat exchanger (450) disposed on the other side surface of the shielding member and cooling air using a refrigerant supplied from the cooling device,
At least a part of the cooling device is a refrigeration unit fixed to the shielding member.
The frame has a frame-shaped frame (421) formed in a frame shape,
The refrigeration unit according to claim 1, wherein a peripheral portion of the shielding member is fixed to the frame-shaped frame.
The refrigeration unit according to claim 2, wherein the frame has a space forming frame (423) forming an accommodation space (425) of the cooling device on one side of the frame-shaped frame.
The cooling device has a pressurizing device (443) for pressurizing the refrigerant,
The refrigeration unit according to claim 3, wherein the pressurizing device is disposed in the accommodation space.
The shielding member has a protruding portion (431) formed to protrude on the one side surface side,
The refrigeration unit according to claim 3, wherein the cooling device is fixed to the protrusion.
The refrigeration unit according to claim 5, wherein the shielding member has a non-projecting portion (432) formed flat on a side of the projecting portion.