JP2020125891A - Refrigerator unit and cold insulation vehicle - Google Patents

Abstract

To reduce noise of an engine.SOLUTION: A refrigerator unit 15 comprises: a casing 30; a compressor 41 arranged in the casing 30, and for compressing a refrigerant; a driving source 50 arranged in the casing 30, and for driving the compressor 41; a partition wall 62 for partitioning a space in the casing 30 into a driving source housing part S22 in which the driving source 50 is housed, and a compressor housing part S23 in which the compressor 41 is housed; a fan 63 for generating wind flowing toward the outside of the casing 30 via the compressor housing part S23 from the driving source housing part S22; and a throttle part 70 formed by the partition wall 62, and for narrowing a flow passage cross sectional area for the wind flowing to the compressor housing part S23 from the driving source housing part S22. An outlet opening part 39B for allowing communication between the compressor housing part S23 and the outside is formed in the casing 30.SELECTED DRAWING: Figure 2

Description

The present invention relates to a refrigerator unit and a vehicle for cold storage.

As a vehicle for cold storage, for example, there is one that includes a trailer having a trailer body, a tractor that pulls the trailer, and a refrigerator unit that is disposed on the front side of the front wall of the trailer body and cools the inside of the trailer body. ..

For example, Patent Literature 1 describes a trailer refrigerating apparatus mounted on a refrigeration vehicle for transporting frozen foods, fresh foods, and the like by land. This trailer refrigeration system includes, in a casing, a refrigerant circuit forming a vapor compression refrigeration cycle, an engine for power generation, and a generator. The refrigerant circuit includes a compressor for compressing the refrigerant, a condenser that condenses the refrigerant and radiates heat to the outside air, a capillary that depressurizes the condensed refrigerant, an expansion mechanism such as an expansion valve, and an evaporator that depressurizes the refrigerant. And an evaporator that removes heat from the internal air. In a trailer refrigeration system, an engine and a generator are housed in an engine system machine room provided in a casing. The air outside the trailer outside the trailer is introduced into the casing, heated by exchanging heat with the refrigerant in the condenser forming the refrigerant circuit, and then introduced into the engine system machine room. This outside air passes through the engine and is blown out of the casing.

JP, 2009-52833, A

By the way, in the above-mentioned configuration, the noise generated when the drive source such as the engine provided in the casing operates is the noise source. The casing has an opening communicating with the outside. Therefore, the noise of the drive source easily leaks to the outside of the casing through this opening.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerator unit and a vehicle for cold storage that can reduce noise leaking from the casing to the outside.

The present invention adopts the following means in order to solve the above problems.
A refrigerator unit according to a first aspect of the present invention includes a casing, a compressor arranged in the casing to compress a refrigerant, a drive source arranged inside the casing to drive the compressor, A partition wall for partitioning a space in the casing into a drive source accommodating portion for accommodating the drive source and a compressor accommodating portion for accommodating the compressor, and the drive source accommodating portion via the compressor accommodating portion A fan that generates wind that flows toward the outside of the casing; and a throttle portion that is formed by the partition wall and that narrows the flow passage cross-sectional area of the wind that flows from the drive source storage portion to the compressor storage portion, An outlet opening is formed in the casing to communicate the compressor housing with the outside.

With such a configuration, the sound generated by the drive source passes through the throttle portion when being transmitted from the drive source accommodation portion to the compressor accommodation portion. Since the flow passage cross-sectional area is narrowed in the throttle portion, it becomes difficult for sound to be transmitted from the drive source housing portion to the compressor housing portion. This suppresses the level of sound from the drive source that leaks to the outside of the casing.

Further, in the refrigerator unit according to the second aspect of the present invention, in the first aspect, the throttle portion is a communication opening that communicates the drive source accommodation portion and the compressor accommodation portion, and the drive source accommodation portion. The compressor housing section and the compressor housing section may communicate with each other only by the throttle section.

With such a configuration, the sound from the drive source is reflected by the partition wall and is transmitted to the compressor housing portion only from the throttle portion. As a result, it becomes more difficult for sound to be transmitted from the drive source accommodation section to the compressor accommodation section. This further suppresses the level of sound from the drive source that leaks to the outside of the casing.

Further, in the refrigerator unit according to the third aspect of the present invention, in the first aspect or the second aspect, the compressor is arranged at a position overlapping the throttle portion when viewed from the outlet opening. May be.

With such a configuration, the sound transmitted to the compressor housing portion collides with the compressor after passing through the throttle portion. Therefore, sound energy is attenuated in the compressor housing. As a result, the level of sound leaking from the inside of the compressor housing to the outside of the casing is further suppressed.

Further, in the refrigerator unit according to the fourth aspect of the present invention, in the third aspect, a gap communicating with the throttle portion may be formed between the partition wall and the compressor.

With such a configuration, the sound transmitted to the compressor housing through the throttle is reflected between the inner peripheral surface of the partition wall and the outer peripheral surface of the compressor. As a result, the energy of the sound transmitted from the drive source housing to the compressor housing is attenuated. As a result, the level of sound leaking from the inside of the compressor housing to the outside of the casing is further suppressed.

Further, in the refrigerator unit according to the fifth aspect of the present invention, in any one of the first aspect to the fourth aspect, the casing faces the outlet opening from the partition wall in the compressor housing portion. May have a cross-sectional area reducing portion whose cross-sectional area is gradually reduced, and a sound absorbing material may be provided between the outlet opening and the compressor in the cross-sectional area reducing portion.

With such a configuration, in the cross-sectional area reducing portion of the compressor housing portion, the cross-sectional area gradually decreases toward the outlet opening portion, so that the energy of sound toward the outlet opening portion in the compressor housing portion is reduced. Attenuated. Furthermore, the sound absorbing material can further attenuate the sound energy as it exits the casing from the outlet opening. As a result, the level of sound leaking from the inside of the compressor housing to the outside of the casing is further suppressed.

Further, a vehicle for cold storage according to a sixth aspect of the present invention is provided with a trailer main body for accommodating cargo, and any one of the first to fifth aspects provided on a wall surface of the trailer main body for cooling the inside of the trailer main body. And two refrigerator units.

According to the present invention, it is possible to reduce noise leaking from the casing to the outside.

It is a side view which shows schematic structure of the vehicle for cold insulation provided with the refrigerator unit which concerns on embodiment of this invention. It is a B1-B2 arrow sectional view of the refrigerator unit shown in FIG. It is a C1-C2 arrow sectional view of the refrigerator unit shown in FIG.

Hereinafter, embodiments for implementing a refrigerator unit and a vehicle for cold storage according to the present invention will be described with reference to the accompanying drawings. However, the invention is not limited to only these embodiments.

FIG. 1 is a schematic diagram showing the configurations of a refrigerator unit and a vehicle for cold storage according to an embodiment of the present invention. As shown in FIG. 1, a vehicle 10 for cold storage according to the present embodiment includes a tractor (vehicle body) 11, a trailer 12, and a refrigerator unit 15.

Here, in the following description, the direction connecting the front and the rear in the traveling direction of the cold insulation vehicle 10 is the front-rear direction Da, and the height direction of the cold insulation vehicle 10 orthogonal to the front-rear direction Da is the vertical direction Dv. The width direction of the vehicle 10 for cold insulation orthogonal to the front-rear direction Da and the vertical direction Dv is simply referred to as the width direction Dw.

The tractor 11 has a cab 17 which is a driver's seat. The tractor 11 pulls the trailer 12.

The trailer 12 has a trailer body 22 and a chassis 23. The trailer body 22 is a box-shaped container supported by a chassis 23 from below. The trailer body 22 extends in the front-rear direction Da and has a rectangular parallelepiped shape. Inside the trailer body 22, a space is formed to accommodate a cargo (not shown) that needs to be kept cold.

The trailer body 22 has a front wall 22A, a top wall 22B, a first lateral wall 22C, and a second lateral wall 22D. The front wall 22A is arranged on the side closer to the tractor 11 in the front-rear direction Da. The front wall 22A has a front surface (wall surface) 22Aa to which the refrigerator unit 15 is fixed. The front surface 22Aa is a surface facing the trailer body 22. The front end of the ceiling wall 22B in the front-rear direction Da is connected to the upper end of the front wall 22A.

The chassis 23 is provided on the lower surface of the trailer body 22. The chassis 23 extends in the front-rear direction Da.

As shown in FIGS. 2 and 3, the refrigerator unit 15 mainly includes a casing 30, a refrigeration cycle 40, and an engine generator (driving source) 50.

The casing 30 has a box shape. The casing 30 includes a rear plate 31, a front plate 32, an upper plate 33, a bottom plate 34, a first side plate 35, a second side plate 36, and a partition plate 37.

The rear plate 31 is provided along the front surface 22Aa (see FIG. 1). In some cases, there is no rear plate 31, and the front surface 22Aa functions as the rear plate 31. The rear plate 31 has a rectangular plate shape extending along an imaginary plane orthogonal to the front-rear direction Da. The front plate 32 is provided with a space in front of the rear plate 31 in the front-rear direction Da. The front plate 32 is curved so as to extend rearward in the front-rear direction Da from the center portion in the width direction Dw toward both sides in the width direction Dw.

The bottom plate 34 connects the lower end of the rear plate 31 and the lower end of the front plate 32. The bottom plate 34 has a plate shape that extends along an imaginary plane orthogonal to the vertical direction Dv. The upper plate 33 is provided in parallel with the bottom plate 34 with a space below the bottom plate 34 in the vertical direction Dv. The upper plate 33 connects the upper end of the rear plate 31 and the upper end of the front plate 32. Here, there is a case where the upper plate 33 is not provided and the entire upper plate is used as the opening.

The first side plate 35 is connected to the side end of the rear plate 31, the side end of the front plate 32, the side end of the upper plate 33, and the side end of the bottom plate 34 on the first side (right side in FIG. 2) in the width direction Dw. There is. The first side plate 35 has a plate shape that extends along an imaginary plane that is substantially orthogonal to the width direction Dw. The second side plate 36 is provided substantially parallel to the first side plate 35 with an interval on the second side (left side in FIG. 2) in the width direction Dw with respect to the first side plate 35. The second side plate 36 is connected to the side end of the rear plate 31, the side end of the front plate 32, the side end of the upper plate 33, and the side end of the bottom plate 34 on the second side in the width direction Dw.

The partition plate 37 divides the space inside the casing 30 into two parts in the vertical direction Dv. The partition plate 37 is provided between the upper plate 33 and the bottom plate 34 in the vertical direction Dv with a space in the vertical direction Dv with respect to both the upper plate 33 and the bottom plate 34. The partition plate 37 is connected to the rear plate 31, the front plate 32, the upper plate 33, and the bottom plate 34. Thus, the partition plate 37 divides the space inside the casing 30 into the first space S1 and the second space S2.

The first space S1 is an upper space inside the casing 30. The second space S2 is a space below the casing 30 and is a space below the first space S1.

A first upper opening 38A and a first lower opening 38B are formed in the first side plate 35. The first upper opening 38A is an outlet opening for sending the air sent into the casing 30 from the later-described upper blower fan 47 to the outside. The first lower opening 38B is an inlet opening for feeding air into the casing 30.

The first upper opening 38A is formed in the first side plate 35 above the partition plate 37 in the vertical direction Dv. The first upper opening 38A penetrates the first side plate 35 in the width direction Dw. That is, the first upper opening 38A communicates the outside of the casing 30 with the inside of the first space S1.

The first lower opening 38B is formed in the first side plate 35 below the partition plate 37 in the vertical direction Dv. The first lower opening 38B penetrates the first side plate 35 in the width direction Dw. That is, the first lower opening 38B communicates the outside of the casing 30 with the inside of the second space S2.

A second upper opening 39A and a second lower opening 39B are formed in the second side plate 36. The second upper opening 39A and the second lower opening 39B are outlet openings for sending air from the inside of the casing 30 to the outside.

The second upper opening 39A is formed in the second side plate 36 above the partition plate 37 in the up-down direction Dv. The second upper opening 39A penetrates the second side plate 36 in the width direction Dw. That is, the second upper opening 39A communicates the outside of the casing 30 with the inside of the first space S1.

The second lower opening 39B is formed in the second side plate 36 below the partition plate 37 in the up-down direction Dv. The second lower opening 39B penetrates the second side plate 36 in the width direction Dw. That is, the second lower opening 39B communicates the outside of the casing 30 with the inside of the second space S2.

A first partition wall 61 and a second partition wall (partition wall) 62 are further provided in the second space S2 provided on the lower side of the casing 30.

The first partition wall 61 partitions the second space S2 in the width direction Dw. The first partition wall 61 is provided at a position closer to the first lower opening 38B in the width direction Dw with respect to the central portion of the second space S2 in the width direction Dw. The first partition wall 61 has a plate shape that extends along an imaginary plane orthogonal to the width direction Dw. The first partition wall 61 extends in the up-down direction Dv so that the upper end is connected to the partition plate 37 and the lower end is connected to the bottom plate 34. The first partition wall 61 is formed with a first series of openings 64 that penetrate the first partition wall 61 in the width direction Dw.

The second partition wall 62 partitions the second space S2 in the width direction Dw at a position close to the second lower opening 39B with respect to the first partition wall 61. The second partition wall 62 is provided at a position near the second lower opening 39B in the width direction Dw with respect to the central portion of the second space S2 in the width direction Dw. The second partition wall 62 has a plate shape that extends along an imaginary plane orthogonal to the width direction Dw. The second partition wall 62 extends in the up-down direction Dv so that the upper end is connected to the partition plate 37 and the lower end is connected to the bottom plate 34. In the lower portion of the second partition wall 62, a second communication opening (throttle portion, communication opening) 65 that penetrates the second partition wall 62 in the width direction Dw is formed.

The second space S2 is divided into three in the width direction Dw by the first partition wall 61 and the second partition wall 62. The second space S2 has an electrical component housing S21, an engine housing (drive source housing) S22, and a compressor housing S23. The electrical component housing S21 is a space formed between the first side plate 35 and the first partition wall 61 in the second space S2. The engine housing portion S22 is a space formed between the first partition wall 61 and the second partition wall 62. The compressor housing S23 is a space formed between the second partition wall 62 and the second side plate 36. The electrical component housing S21 and the engine housing S22 are communicated with each other only through the first series opening 64. The engine housing S22 and the compressor housing S23 are communicated with each other only through the second communication opening 65.

The refrigeration cycle 40 mainly includes a compressor 41, an outdoor heat exchanger 42, an indoor heat exchanger (not shown), and an accumulator 46. The compressor 41, the outdoor heat exchanger 42, the indoor heat exchanger (not shown), and the accumulator 46 are connected via a refrigerant pipe (not shown) through which the refrigerant passes.

The compressor 41 is connected to the accumulator 46 and the outdoor heat exchanger 42. The compressor 41 compresses the refrigerant supplied from the accumulator 46 into high temperature and high pressure. The compressor 41 sends the compressed refrigerant to the outdoor heat exchanger 42. The compressor 41 is housed in the compressor housing S23.

The outdoor heat exchanger 42 is provided between the compressor 41 and a receiver (not shown). The outdoor heat exchanger 42 cools the high-temperature and high-pressure refrigerant compressed by the compressor 41 by exchanging heat with the outside air. The outdoor heat exchanger 42 is housed in the first space S1 inside the casing 30. The outdoor heat exchanger 42 is arranged on the air flow path in the first space S1. An upper blower fan 47 is provided in the casing 30 to apply the air outside the casing 30 to the outdoor heat exchanger 42.

The refrigerant cooled by the outdoor heat exchanger 42 is sent to the indoor heat exchanger via the receiver and the expansion valve. The indoor heat exchanger exchanges heat between the refrigerant in the low pressure and low temperature state and the air in the trailer body 22 to generate cold air. The trailer body 22 is cooled by the cold air.

The accumulator 46 receives the refrigerant that has passed through the indoor heat exchanger. The refrigerant that has passed through the accumulator 46 is supplied to the compressor 41. The accumulator 46 is housed in the compressor housing S23 together with the compressor 41. The accumulator 46 and the compressor 41 are connected via a connecting pipe 49. The connection pipe 49 is arranged between the second lower opening 39B and the compressor 41 in the width direction Dw in the compressor housing S23. Specifically, the connection pipe 49 is arranged at a position overlapping a virtual straight line connecting the second lower opening 39B and the second communication opening 65 when the compressor housing S23 is viewed from the outside of the casing 30. ..

The engine generator 50 drives the compressor 41. The engine generator 50 is housed in the engine housing section S22. As the engine generator 50, for example, the engine body 51 and the generator 52 are arranged in series in a direction along the axis of the crankshaft of the engine body 51 (the engine body 51 and the generator 52 are integrated. Stuff) can be used. As the engine body 51, for example, a diesel engine can be used. The generator 52 is driven by the engine body 51. The electric power generated by the generator 52 causes the controller 16 that controls the driving of the compressor 41 and the other devices in the refrigerator unit 15 to operate.

An engine battery 53 is provided in the engine housing S22. The engine battery 53 is provided on the second partition wall 62 in the engine housing portion S22. The engine battery 53 is provided so as to project from the second partition wall 62 toward the engine body 51, for example.

A radiator 56 is provided in the first space S1. The radiator 56 cools the cooling water of the engine body 51 by heat exchange with the outside air. In this embodiment, the radiator 56 has a left radiator 56A and a right radiator 56B. The left radiator 56A and the right radiator 56B are arranged apart from each other in the width direction Dw with the upper blower fan 47 interposed therebetween. The wind generated by the upper blower fan 47 passes through the outdoor heat exchanger 42, the right side radiator 56B on the first side in the width direction Dw or the left side radiator 56A on the second side in the width direction Dw, and then the first upper opening. 38A and the second upper opening 39A are discharged to the outside of the casing 30.

A lower blower fan (fan) 63 is provided in the first series of openings 64 formed in the first partition wall 61. When the lower blower fan 63 is operated, the air outside the casing 30 is introduced into the electrical component housing portion S21 of the casing 30 through the first lower opening 38B. This flow of air, that is, the wind, flows from the electrical component housing S21 into the engine housing S22 through the first series opening 64 of the first partition wall 61. The wind flowing into the engine housing S22 cools the engine generator 50, the engine battery 53, and the like. Thereafter, the wind flows into the compressor housing S23 from the second communication opening 65 formed in the second partition wall 62. The wind that has flowed into the compressor housing S23 passes through the periphery of the compressor 41 and is discharged from the second lower opening 39B to the outside of the casing 30.

Here, in order to suppress the sound (noise) generated during the operation of the engine generator 50 from leaking to the outside of the casing 30, the refrigerator unit 15 includes the throttle portion 70, the gap 71, and the cross-sectional area reduction portion. 73 and a sound absorbing material 74.

The narrowed portion 70 is formed by the second partition wall 62. The throttle portion 70 narrows the flow passage cross-sectional area of the air flowing from the engine housing portion S22 to the compressor housing portion S23. Specifically, in the throttle unit 70, the flow passage cross-sectional area in the flow passage cross section orthogonal to the width direction Dw is significantly narrowed compared to the engine housing S22 and the compressor housing S23, and the air flows. The flow path when doing is narrowed. The throttle portion 70 of the present embodiment is the second communication opening 65 that connects the engine housing portion S22 and the compressor housing portion S23. The second communication opening 65 is a gap formed between the bottom plate 34 and the lower end of the second partition wall 62 in the vertical direction Dv. The height of the second communication opening 65 in the vertical direction Dv is lower than that of the compressor 41 and the engine body 51.

At least a part of the compressor 41 is provided at a position facing the second communication opening 65 formed in the second partition wall 62 in the width direction Dw. The compressor 41 of the present embodiment is arranged at a position overlapping the second communication opening 65 when the compressor housing S23 is viewed from the second lower opening 39B. That is, the compressor 41 is arranged at a position overlapping a virtual straight line that connects the second lower opening 39B and the second communication opening 65.

In the width direction Dw, between the surface of the second partition wall 62 (the surface facing the second side in the width direction Dw) and the outer peripheral surface of the compressor 41 (the surface facing the first side in the width direction Dw). Has a gap 71 formed therein. That is, the gap 71 is formed between the surfaces of the second partition wall 62 and the compressor 41 that face each other. The gap 71 communicates with the narrowed portion 70. The gap 71 is surrounded by the second partition wall 62, the compressor 41, the rear plate 31, and the front plate 32. The gap 71 forms a flow path through which the air passing through the throttle portion 70 flows.

The cross-sectional area reduction section 73 is formed in the compressor housing section S23. The cross-sectional area reduction portion 73 is an area in the compressor housing portion S23 where the cross-sectional area (cross-sectional area orthogonal to the width direction Dw) gradually decreases from the second partition wall 62 toward the second lower opening 39B. is there. The cross-sectional area reduction portion 73 is curved with respect to the rear plate 31 of the casing 30 so that the front plate 32 approaches the rear plate 31 as it goes from the central portion in the width direction Dw to the outside in the width direction Dw. Is formed by.

The sound absorbing material 74 is formed of a material capable of converting vibration of a sound wave transmitted in the air into heat energy to greatly attenuate the sound. Specifically, the sound absorbing material 74 is preferably made of a material capable of absorbing a high frequency (for example, about 1 kHz to 10 kHz) generated in the compressor 41. The sound absorbing material 74 is arranged between the second lower opening 39B and the compressor 41 in the cross-sectional area reducing portion 73 when viewed in the vertical direction Dv. For example, it is preferable that the sound absorbing material 74 is provided at a position overlapping the second lower opening 39B in the cross-sectional area reducing portion 73 when viewed from the outside of the casing 30. Specifically, the sound absorbing material 74 is wound so as to cover the outer peripheral surface of the connection pipe 49 provided in the compressor housing S23. The sound absorbing material 74 may be provided so as to cover the accumulator 46 itself. That is, the sound absorbing material 74 may be provided on at least one of the accumulator 46 and the connection pipe 49. Here, the sound absorbing material 74 wound around the accumulator 46 and the connecting pipe 49 is provided at a position close to the second lower opening 39B at the cross-sectional area reducing portion 73 with respect to the compressor 41. That is, in the cross-sectional area reduction portion 73 of the compressor accommodating portion S23, the sound absorbing material 74 is provided in a portion where the cross-sectional area is greatly reduced. In other words, the sound absorbing material 74 wound around the accumulator 46 and the connecting pipe 49 is provided at the position facing the second lower opening 39B in the cross-sectional area reducing portion 73.

In such a refrigerator unit 15, the sound generated by the engine generator 50 inside the engine housing S22 collides with the engine battery 53 and the air cleaner unit 54 provided inside the engine housing S22. As a result, the sound energy from the engine generator 50 is attenuated.

After that, the sound from the engine generator 50 passes through the throttle portion 70 (second communication opening 65) when being transmitted from the engine housing portion S22 to the compressor housing portion S23. The narrowed portion 70 has a flow passage cross-sectional area narrower than that of the engine housing portion S22 and the compressor housing portion S23. Therefore, the energy of the sound is attenuated by being transmitted through the throttle portion 70, and it becomes difficult for the sound to be transmitted from the engine housing portion S22 to the compressor housing portion S23.

Further, the sound transmitted to the compressor housing portion S23 via the second communication opening 65 collides with the compressor 41 facing the second communication opening 65 after exiting the second communication opening 65. Therefore, the sound energy is further attenuated in the compressor housing S23.

Further, the sound that collides with the compressor 41 and the sound from the compressor 41 are repeatedly reflected multiple times in the gap 71 between the second partition wall 62 and the compressor 41 in the compressor housing S23. Further, the cross-sectional area reduction portion 73 in the compressor housing portion S23 gradually reduces the cross-sectional area toward the second lower opening 39B, so that the sound reflected by the gap 71 is numerous on the inner peripheral surface of the casing 30. Is reflected twice. As a result, the sound energy is further attenuated. Most of the energy of the sound after repeated reflection is absorbed by the sound absorbing material 74 provided at the position facing the second lower opening 39B, and reaches the second lower opening 39B.

According to the refrigerator unit 15 and the trailer 12 as described above, the sound wave of the noise generated in the engine generator 50 passes through the throttle portion 70 when being transmitted from the engine housing portion S22 to the compressor housing portion S23. As a result, the sound energy from the engine generator 50 is attenuated. Therefore, the level of sound from the engine generator 50 leaking from the compressor housing S23 to the outside of the casing 30 is suppressed. As a result, it is possible to reduce noise in the refrigerator unit 15 and the trailer 12. Therefore, noise leaking from the casing 30 to the outside can be reduced.

Further, the second partition wall 62 that partitions the engine housing S22 and the compressor housing S23 forms the second communication opening 65 having a smaller flow passage cross-sectional area than the flow passage of the wind in the compressor housing S23. Thus, the narrowed portion 70 can be easily formed.

Further, since the engine housing S22 and the compressor housing S23 communicate with each other only through the second communication opening 65, the sound generated in the engine generator 50 passes through only the second communication opening 65 and is housed in the compressor. It is transmitted to department S23. As a result, it becomes more difficult for sound to be transmitted from the engine housing S22 to the compressor housing S23. As a result, the level of sound leaking to the outside of the casing 30 is further suppressed.

Further, the sound transmitted to the compressor housing portion S23 collides with the compressor 41 after passing through the second communication opening 65 as the throttle portion 70. Therefore, the sound energy is attenuated in the compressor housing S23. As a result, the level of sound leaking from the inside of the compressor housing S23 to the outside of the casing 30 is further suppressed.

Further, the sound transmitted to the compressor housing S23 via the second communication opening 65 is reflected by the gap 71, and the energy thereof is attenuated. As a result, the level of sound leaking from the inside of the compressor housing S23 to the outside of the casing 30 is further suppressed.

Further, in the cross-sectional area reduction portion 73 of the compressor housing portion S23, the cross-sectional area gradually decreases toward the second lower opening 39B, so that the sound energy generated by the engine generator 50 and the compressor 41 is attenuated. In addition, the sound waves caused by the noise of the engine generator 50 collide with the accumulator 46 and the connecting pipe 49 provided in the cross-sectional area reduction unit 73, and the energy thereof is attenuated.

Furthermore, the sound absorbing material 74 provided at a position facing the second lower opening 39B can further attenuate the energy of sound emitted from the second lower opening 39B to the outside of the casing 30. In particular, by providing the sound absorbing material 74 on the connecting pipe 49 provided at such a position, it is possible to efficiently absorb the energy of sound waves due to noise. As a result, the level of sound leaking from the inside of the compressor housing S23 to the outside of the casing 30 is further suppressed. In addition, since the sound absorbing material 74 can exert a heat insulating effect, the heat insulating performance of the refrigerant flowing in the connecting pipe 49 can be improved.

As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, each configuration and the combination thereof in each of the embodiments are examples, and addition and omission of the configurations are not departing from the scope of the invention , Substitutions, and other changes are possible. Also, the invention is not limited to the embodiments, but only by the claims.

For example, the refrigeration cycle 40 illustrated in FIGS. 2 and 3 is an example, and the configuration of the refrigeration cycle 40 is not limited to the configurations illustrated in FIGS. 2 and 3.

Further, in the above embodiment, the narrowed portion 70 is configured by the second communication opening 65 formed in the second partition wall 62, but the configuration is not limited to this. The throttle portion 70 may have any other configuration as long as it can reduce the flow passage cross-sectional area from the engine housing portion S22 to the compressor housing portion S23. Therefore, the second communication opening 65 that is the narrowed portion 70 may be formed as, for example, a through hole that penetrates the second partition wall 62.

Further, it is not limited to providing the sound absorbing material 74 as in the present embodiment.

10 Cooling vehicle 11 Tractor (vehicle body)
12 Trailer 15 Refrigerator Unit 16 Controller 17 Cab 22 Trailer Main Body 22A Front Wall 22Aa Front Face 22B Top Wall 23 Chassis 30 Casing 31 Rear Plate 32 Front Plate 33 Upper Plate 34 Bottom Plate 35 First Side Plate 36 Second Side Plate 37 Partition Plate 38A First Upper opening 38B First lower opening 39A Second upper opening 39B Second lower opening (outlet opening)
40 Refrigeration Cycle 41 Compressor 42 Outdoor Heat Exchanger 46 Accumulator 47 Upper Blower Fan 49 Connection Pipe 50 Engine Generator (Drive Source)
51 Engine Main Body 52 Generator 53 Engine Battery 54 Air Cleaner Unit 56 Radiator 56A Left Radiator 56B Right Radiator 61 First Partition Wall 62 Second Partition Wall (Partition Wall)
63 Lower fan (fan)
64 first communication opening 65 second communication opening (communication opening)
70 Throttle portion 71 Gap 73 Cross-sectional area reduction portion 74 Sound absorbing material Da Front-rear direction Dv Vertical direction Dw Width direction S1 First space S2 Second space S21 Electrical equipment accommodating portion S22 Engine accommodating portion (driving source accommodating portion)
S23 Compressor housing

Claims (6)

A casing,
A compressor disposed in the casing to compress the refrigerant,
A drive source disposed inside the casing to drive the compressor;
A partition wall that partitions the space in the casing into a drive source housing portion in which the drive source is housed and a compressor housing portion in which the compressor is housed,
A fan that generates wind flowing from the drive source storage portion to the outside of the casing via the compressor storage portion;
A narrowing portion formed by the partition wall and narrowing a flow passage cross-sectional area of the wind flowing from the drive source housing portion to the compressor housing portion;
The refrigerator unit in which the casing has an outlet opening for communicating the compressor housing with the outside. The throttle portion is a communication opening that communicates the drive source housing portion and the compressor housing portion,
The refrigerator unit according to claim 1, wherein the drive source accommodating portion and the compressor accommodating portion communicate with each other only through the throttle portion. The refrigerator unit according to claim 1 or 2, wherein the compressor is arranged at a position overlapping the throttle portion when viewed from the outlet opening. The refrigerator unit according to claim 3, wherein a gap communicating with the throttle portion is formed between the partition wall and the compressor. The casing has a cross-sectional area reducing portion in which the cross-sectional area is gradually reduced from the partition wall toward the outlet opening in the compressor housing portion,
The refrigerator unit according to any one of claims 1 to 4, wherein a sound absorbing material is provided between the outlet opening and the compressor in the cross-sectional area reducing portion. A trailer body for accommodating cargo,
A refrigerating machine according to any one of claims 1 to 5, which is provided on a wall surface of the trailer body and cools the inside of the trailer body.

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