JP2002221385A - Cooler and food serving wagon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooler, in which warm air can be surely discharged from a housing space, cooling performance is not reduced, even in a continuous operation in an environment of high temperature and humidity. SOLUTION: A cooler A is provided with a fan 3, a compressor 4, and a condenser 5, which are housed in a housing space 2 having an exhaust outlet 1. The fan 3, the compressor 4, and the condenser 5 are disposed in the mentioned order. Since the compressor 4, which makes a hindrance to air flow, is not placed in the downstream of the fan 3, warm air can be discharged surely from the space 2 through the outlet 1 to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator for cooling the inside of a refrigerator or a freezer and a serving truck provided with the refrigerator.

[0002]

2. Description of the Related Art Conventionally, a cooler A is formed by using a condensing unit 10 as shown in FIGS. The condensing unit 10 is provided with a compressor 4, a condenser 5, an accumulator 12, a receiver 40, and a three-way valve 13 on the upper surface of a plate-like substrate 7, and these are connected by a pipe 14. It is formed by disposing the fan motor 15 and the control box 32. The fan 3 is of a diffusion type that blows air in one direction by a rotational drive of a fan motor 15. A condenser 5 is disposed upstream of the fan 3 in the air blowing direction and the fan 3 Also, components other than the condenser 5 such as the compressor 4 are disposed downstream. The fan 3 is arranged close to the condenser 5.

[0003] Such a condensing unit 10 is attached to a cooling device having a refrigerator or a freezer. FIG. 11A shows an example in which a cooling machine A is formed by attaching the above-described condensing unit 10 to a serving truck B which is one of the cooling devices. The serving truck B transports meals and the like while cooling it, and is provided with a plurality of wheels 28 below the refrigerator 27 so as to be able to run freely. Further, the serving truck B is provided with a bumper 29 for preventing the wheels 28 from colliding with a wall or the like during traveling. The bumper 29 is provided so as to be substantially suspended over the entire outer periphery of the lower end of the refrigerator 27, and is formed so that all the wheels 28 are located in a space surrounded by the bumper 29.
The space surrounded by the bumper 29 between the front and rear wheels 28 is a storage space 2 whose lower surface is opened over the entire surface.
As shown in FIGS. 10 (a) and 10 (b), the condensing unit 10
The cooler A is formed by storing the components provided on the substrate 7 and mounting the condensing unit 10 below the refrigerator 27.

[0004] In the storage space 2, an intake port 30 and an exhaust port 1 are formed. The intake port 30 is formed by providing a gap between the end of the substrate 7 located on the upstream side of the condenser 5 in the air blowing direction and the lower end of the bumper 29. Is formed by providing a gap between the end of the substrate 7 located downstream of the condenser 5 in the air blowing direction and the lower end of the bumper 29.

[0005] Cooling of the refrigerator 27 by the cooler A is performed as follows. First, a gaseous refrigerant such as Freon or ammonia is compressed by the compressor 4. Next, the compressed high-temperature and high-pressure refrigerant is supplied to the condenser 5 and circulated through the pipe of the condenser 5. On the other hand, the fan 3 is rotationally driven by the fan motor 15, and the rotational driving of the fan 3 causes air to be sucked into the storage space 2 from the intake port as shown by the arrow. The air sucked into the storage space 2 passes through the condenser 5 and then flows downstream of the fan 3 in which the compressor 4 and the like are disposed, and is discharged to the outside of the storage space 2 through the exhaust port 1 as shown by an arrow. However, when the air passes through the condenser 5, heat exchange is performed between the refrigerant flowing in the pipe and the air, and the high-temperature and high-pressure refrigerant is cooled and condensed and liquefied. Thereafter, the condensed and liquefied refrigerant is supplied to the refrigerator 27, where the refrigerant is expanded to remove heat inside the refrigerator, thereby cooling the refrigerator. Thus, the refrigerator 27 can be cooled.

[0006]

However, in the conventional cooler A, since many components such as the compressor 4 are arranged downstream of the fan 3, the components such as the compressor 4 become obstacles and the fan 3 The air flowing downstream of the exhaust port 1
It is difficult for the air to flow toward the storage space 2, and the exhaust is not efficiently performed from the storage space 2, and the warm air is continuously operated and the warm air is generated.
I'll be smiling. Therefore, in the conventional cooler, a so-called short circuit occurs in which warm air in the storage space 2 is supplied to the condenser 5 again above or beside the condensing unit 10 as shown by an arrow, and a high-temperature high-pressure There is a problem that the refrigerant cannot be efficiently condensed and liquefied, and the cooling performance is reduced by continuous operation. In addition, since the condensing unit 10 conventionally developed for commercial refrigerators is diverted to the serving car B as it is to form the cooler A, in most cases,
The conventional cooler A is not suitable for the serving truck B which may be used in a high-temperature and high-humidity environment because there is a limitation that it cannot be used in an environment of not less than ° C.

Therefore, as shown in FIG. 11 (b), a cooling machine A is mounted on the ceiling of the serving car B in consideration of the exhaust gas. However, the height of the serving car B becomes large. The position of the center of gravity of the serving truck B becomes high, and the running of the serving truck B becomes difficult to perform stably.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a cooler capable of reliably exhausting warm air from a storage space and having a reduced cooling performance even when continuously operated in a high-temperature and high-humidity environment. It is intended to provide.

Another object of the present invention is to provide a catering vehicle that can run stably by mounting a cooler at a lower portion.

[0010]

According to a first aspect of the present invention, there is provided a cooler A including a fan 3, a compressor 4, and a condenser 5 housed in a storage space 2 having an exhaust port 1. The fan 3, the compressor 4, and the condenser 5 are arranged in this order from the side closer to the exhaust port 1.

Further, a cooling device A according to claim 2 of the present invention.
Is characterized in that, in addition to the configuration of the first aspect, the exhaust direction from the exhaust port 1 is obliquely downward.

Further, a cooling device A according to claim 3 of the present invention.
Is characterized in that, in addition to the structure of claim 1 or 2, a wind direction plate 6 is arranged near the exhaust port 1.

Further, a cooling device A according to claim 4 of the present invention.
Is characterized in that a sirocco fan is used as the fan 3 in addition to any one of the first to third aspects.

Further, a cooling device A according to claim 5 of the present invention.
Is a substrate 7 in addition to any one of claims 1 to 4.
The compressor 4 is mounted on a rubber pedestal 8 provided thereon, and a band 9 hung on the compressor 4 is fixed to the substrate 7.

A serving truck B according to a sixth aspect of the present invention is provided with the cooler A according to any one of the first to fifth aspects.

A serving truck B according to claim 7 of the present invention.
Is characterized in that, in addition to the configuration of claim 6, a cooler A is provided at the bottom of the serving car.

[0017]

Embodiments of the present invention will be described below.

FIGS. 2A and 2B show a condensing unit 10 used for the cooler A of the present invention. The condensing unit 10 is provided with a compressor 4, a condenser 5, an accumulator 12, and a three-way valve 13 on the upper surface of a flat plate 7 made of metal or FRP, and these are connected by a pipe 14. Are formed by disposing two fans 3 and a fan motor 15. The fan 3 is formed of a sirocco fan. The fan 3 is connected to the rotation shaft 11 of the fan motor 15 so that the fan 3 is rotatably driven by the fan motor 15. The fan 3 is provided with a fan cover 16. The fan cover 16 is formed so as to cover the fan 3 over substantially the entire circumference in the rotation direction of the fan 3, and the fan cover 16 is formed with an outlet 17 that opens diagonally downward. The fan 3 is provided near one end of the substrate 7, and the outlet 17 of the fan cover 16 is formed outward from the end of the substrate 7 on which the fan 3 is disposed in proximity. I have.

The condenser 5 is provided with a pipe, fins and the like, and is arranged along the end opposite to the end of the substrate 7 on which the fan 3 is arranged in close proximity.
In addition, compressor 4, accumulator 12, three-way valve 1
The pipe 3 and the pipe 14 are disposed between the fan 3 and the condenser 5 at substantially the center of the upper surface of the substrate 7.

The compressor 4 is mounted on a rubber base 8 provided on the upper surface of the substrate 7. As shown in FIG. 3, the compressor 4 is formed in a horizontally long substantially columnar shape, and leg portions 18 are fixed to lower surfaces of both ends by screws or the like. As shown in FIGS. 4A to 4D, the leg portion 18 is formed of a metal fitting having a substantially U-shaped cross section with an open lower surface and a thickness of about 2 mm. At both ends of the leg 18, mounting pieces 19 are protruded, and the mounting pieces 19 are formed with insertion holes 20 that penetrate vertically. FIG. 5 (a)
As shown in (b), the pedestal 8 is formed in a substantially cylindrical shape, and a specially formed through hole 21 penetrating vertically is provided inside the pedestal 8 and a concave groove 22 is formed on the outer periphery of the pedestal 8.
Are formed over the entire circumference.

The compressor 4 is fixed to the upper surface of the substrate 7 as follows. First, the pedestal 8 is inserted into the insertion hole 20 of the leg 18 attached to the compressor 4.
Is inserted from below while elastically deforming the upper part of the pedestal, the upper part of the pedestal 8 is passed through the insertion hole 20, the upper part of the pedestal 8 is projected above the mounting piece 19, and the peripheral edge of the insertion hole 20 is pedestal. 8 is inserted into the groove 22 of FIG.
As shown in (a), the pedestal 8 is attached to the insertion piece 19 of the leg 18.
Attach. Next, as shown in FIG. 6B, the through hole 21 of the pedestal 8 is inserted from above into a metal positioning rod 23 erected on the substrate 7, and the pedestal 8 is placed on the upper surface of the substrate 7. By doing so, the compressor 4 is placed on the substrate 7 via the pedestal 8 and the leg 18. After this, FIG.
As shown in (a) to (c), two bands 9 are wound around the outer periphery of the compressor 4, and both ends of each band 9 are fixed to the substrate 7. A cushioning material (cushion material) made of rubber or the like is provided inside the band 9, and a gap of several millimeters is formed between the cushioning material of the band 9 and the compressor 4.

By mounting the compressor 4 on the substrate 7 via the rubber base 8 and the band 9 as described above, the compressor 4 is operated without touching the band 9 during operation. The vibrations are absorbed, the vibrations are not easily transmitted to the substrate 7, and the vibration and noise of the serving car B can be reduced. In addition, the band 9 reduces the upward movement of the compressor 4 caused by the movement of the serving truck B to a certain amount, so that the stress on the pipe 14 connected to the compressor 4 is reduced. Thus, it is possible to prevent breakage such as a pipe crack and prevent problems such as gas leakage from occurring.

FIG. 8 shows a conventional compressor 4 fixing structure. In this case, a bolt 24 is used instead of the positioning rod 23. In addition, a collar 25 formed of a metal cylinder is provided inside the pedestal 8. Then, a nut 26 is screwed into an upper end of a bolt 24 penetrating the pedestal 8, the upper surface of the pedestal 8 is pressed by the lower surface of the nut 26, and the pedestal 8 is tightened between the substrate 7 and the nut 26, and the compressor 4 is turned on It was fixed to the substrate 7. The collar 25 functions as a spacer for preventing the pedestal 8 from being excessively compressed by tightening the nut 26. In this conventional fixing structure, vibration is prevented by the degree of compression of the pedestal 8. However, in order to suppress vibration by the degree of compression of the pedestal 8, the delicate degree of compression must be frequently adjusted with the nut 26. Although it takes time to fix the compressor 4, the compressor 4 can be easily fixed without the necessity of fine adjustment of the tightening degree of the nut 26 in the present invention.

The pedestal 8 preferably has a rubber hardness of 30 to 45 °. Rubber hardness of pedestal 8 is 30 °
If it is less than 10 mm, the pedestal 8 may be too soft to support the compressor 4. If the rubber hardness of the pedestal 8 is more than 45 °, the pedestal 8 is too hard to absorb the vibration generated in the compressor 4. It may be difficult. By setting the hardness of the pedestal 8 to 30 to 45 ° and optimizing the position of the band 9 and the size of the gap between the band 9 and the compressor 4 as described above, the pedestal 8 is generated when the compressor 4 is operated and the serving truck is moved. The vibration and the stress and noise on the pipe 14 generated by the vibration can be further reduced. In addition, when the compressor 4 is fixed to the serving car B with the conventional fixed structure, the generated vibration is 0.1 mm.
Although the noise generated was 57 to 60 G and the generated noise was 59.5 dBA, when the compressor 4 was fixed to the serving car B with the fixed structure of the present invention, the generated vibration was 0.04 to
0.07 G, the generated noise is 55.3 dBA, and vibration and noise can be significantly reduced.

The upper surface of the condensing unit 10 is covered with a unit cover 31, and a control box 32 is provided on the lower surface of the unit cover 31. The control box 32 includes a fan motor 1
5 are built in.

Then, the condensing unit 10 formed as described above is provided in the storage space 2 provided in the cooling device.
The cooling machine A is formed by storing the cooling device A in the cooling device A. In the serving truck B of the present invention, the storage space 2 is formed at the bottom. That is, as shown in FIG. 11 (a), the serving car B of the present invention is provided with a plurality of wheels 28 below the refrigerator 27 so as to be able to run freely, and at the entire outer periphery of the lower end of the refrigerator 27. A bumper 29 is provided so as to be substantially suspended over the space, and a space surrounded by the bumper 29 below the refrigerator 27 is formed as the storage space 2. This storage space 2
Is open over its entire lower surface, and FIG.
As shown in (b), the components provided on the substrate 7 of the condensing unit 10 are stored in the storage space 2 from the opening, and the condensing unit 10 is
The cooling device A is formed by attaching the cooling device A to the lower side.

An exhaust port 1 and an intake port 30 are provided in the storage space 2 of the cooler A. The exhaust port 1 is formed by providing a gap between one end of the substrate 7 on which the fan 3 is arranged in proximity and the lower end of the bumper 29 facing this end. The intake port 30 is formed by providing a gap between the other end of the substrate 7 on which the capacitor 5 is arranged in proximity and the lower end of the bumper 29 facing this end. Therefore, the outlet 17 provided in the fan cover 16 is open toward the exhaust port 1. Further, a wind direction plate 6 protruding toward the exhaust port 1 is provided at one end of the substrate 7 on which the fan 3 is arranged in proximity. The wind direction plate 6 is provided over the entire length of the end of the substrate 7 on which the fan 3 is disposed in proximity,
The fan cover 16 is located immediately below the outlet 17. In the cooler A of the present invention, the fan 3, the compressor 4, and the condenser 5 are arranged in order from the exhaust port 1 toward the intake port 30. That is, the condenser 5 is arranged at a position closest to the intake port 30, the fan 3 is arranged at a position closest to the exhaust port 1, and other components are arranged between the condenser 5 and the fan 3. Accordingly, the condenser 5 is arranged on the most upstream side and the fan 3 is arranged on the most downstream side in the flow direction of the air in the storage space 2.

The cooling of the inside of the refrigerator 27 by the cooling device A is performed as follows. First, a gaseous refrigerant such as Freon or ammonia is compressed by the compressor 4. Next, the compressed high-temperature and high-pressure refrigerant is supplied to the condenser 5 and circulated through the pipe of the condenser 5. On the other hand, the fan 3 is driven to rotate by the fan motor 15, and air is drawn into the storage space 2 from the air inlet 30 by the rotation of the fan 3 as indicated by an arrow. The air sucked into the storage space 2 passes between the pipes of the condenser 5, and at this time, heat exchange is performed between the air flowing through the pipe of the condenser 5 and the air, and the high-temperature and high-pressure refrigerant is cooled. To condense and liquefy. Thereafter, the condensed and liquefied refrigerant is supplied to the refrigerator 27, where the refrigerant is expanded to remove heat inside the refrigerator, thereby cooling the refrigerator.
Thus, the refrigerator 27 can be cooled.

The air introduced into the storage space 2 by the rotation of the fan 3 is warmed by passing through the condenser 5, and the warmed air passes through a substantially central portion of the substrate 7 on which the compressor 4 and the like are arranged. To reach the fan cover 16, is introduced into the fan cover 16 from the side surface of the fan cover 16, and is thereafter blown out of the fan cover 16 from the outlet 17 of the fan cover 16. Then, as indicated by the arrow, the warm air blown out from the outlet 17 is discharged to the outside of the storage space 2 through the outlet 1.

In the cooler A of the present invention, the fan 3, the compressor 4, and the condenser 5 are arranged in this order from the exhaust port 1 toward the intake port 30, and the fan is located at a position closest to the exhaust port 1. 3 is provided, and components such as the compressor 4 which is an obstacle to the flow of air are not disposed downstream of the fan 3, so that warm air can be reliably discharged from the storage space 2 through the exhaust port 1. Therefore, warm air is efficiently exhausted from the storage space 2, and the warm air does not stay in the storage space 2 even during continuous operation, and the warm air in the storage space 2 is supplied to the condenser 5 again. Such a short circuit does not occur, and the cooling performance can be prevented from deteriorating even in continuous operation in a high-temperature and high-humidity environment.

In the conventional example shown in FIGS. 10A and 10B, a short circuit occurs in which warm air blown out from the exhaust port 1 is supplied to the condenser 5 again through the lower side of the substrate 7. However, in the present invention, the fan cover 1
6 was arranged facing the exhaust port 1 side, and the exhaust direction from the exhaust port 1 was obliquely downward, so that the bumper 2
By blowing air toward the gap between the lower end of the substrate 9 and the floor, warm air blown out from the exhaust port 1 can be prevented from sneaking into the lower side of the substrate 7, so that warm air can flow under the substrate 7. A short circuit that is supplied to the capacitor again through the side is less likely to occur. In addition, the substrate 7 forming the lower opening edge of the exhaust port 1
Since the wind direction plate 6 protrudes from the end on the exhaust port 1 side, the warm air blown out from the exhaust port 1 can be more reliably prevented from flowing under the substrate 7, and the warm air can be removed from the substrate 7. 7 to be supplied to the capacitor again. Further, by forming the fan 3 by a sirocco fan, the flow of air is easier to control than in the conventional fan 3 of the diffusion type, and the direction of exhaust (blow angle) from the exhaust port 1 is easily changed and adjusted. Is what you can do.

As described above, the cooler A of the present invention can surely exhaust warm air without trapping in the storage space 2. Therefore, even when the cooling machine A is mounted on the serving car B, it is not necessary to mount the cooling machine A on the ceiling of the serving car B in consideration of the exhaust gas. You can do it. Therefore, the height of the catering car B does not increase or the center of gravity of the catering car B does not increase, and the running of the catering car B can be easily performed stably. Moreover, by using the inside of the bumper 29 as the storage space 2, the cooling machine A is not covered by the bumper 29 and the appearance of the serving car B is not deteriorated. Machine A can be mounted. Furthermore, since the exhaust direction from the exhaust port 1 is obliquely downward, by blowing air toward the gap between the lower end of the bumper 29 and the floor, warm air is directly delivered to the person next to the catering car B. It can be prevented from hitting and not giving any discomfort.

When the conventional catering truck B is used in an environment at an ambient temperature of 40 ° C., the temperature at three points on the intake port 30 side of the condenser 5 of the cooler A is measured, and the average value is 4
9 to 53 ° C., the difference from the ambient temperature became 9 to 13 ° C. However, when the serving truck B of the present invention was used under the same conditions, the temperatures at three points on the intake port 30 side of the condenser 5 were averaged. 41.
The temperature was 2 ° C, and the difference from the ambient temperature was 1.2 ° C. That is, since the short circuit does not occur in the cooler A and the serving car B of the present invention, the temperature (suction temperature) of the condenser 5 on the side of the intake port 30 becomes lower than that of the conventional one.

[0034]

As described above, according to the first aspect of the present invention, in a cooling machine including a fan, a compressor and a condenser housed in a storage space having an exhaust port, the fan is connected to the fan from a side closer to the exhaust port. Since the compressor and condenser are arranged in this order, it is possible to ensure that warm air is exhausted from the storage space through the exhaust port by not placing a compressor that is an obstacle to air flow downstream of the fan. It is possible to prevent the warm air in the storage space from being supplied to the condenser again,
It is possible to prevent the cooling performance from lowering even when the apparatus is continuously operated in a high-temperature and high-humidity environment.

According to the second aspect of the present invention, since the exhaust direction from the exhaust port is obliquely downward, the warm air blown out from the exhaust port can be prevented from sneaking to the lower side. This makes it less likely that the cooling water will be supplied to the condenser again through the side, and that the cooling performance will not be reduced even if it is continuously operated in a high-temperature and high-humidity environment.

According to the invention of claim 3 of the present invention, since the wind direction plate is disposed near the exhaust port, the wind direction plate guides warm air blown out from the exhaust port, thereby making it difficult for the air to flow downward. This makes it difficult for warm air to be supplied to the condenser again through the lower side, so that the cooling performance does not decrease even when the apparatus is continuously operated in a high-temperature and high-humidity environment.

According to the invention of claim 4 of the present invention, since a sirocco fan is used as a fan, the flow of air is easier to control as compared with a diffusion type fan, and the direction of exhaust from the exhaust port is easily changed. It can be adjusted.

According to the invention of claim 5 of the present invention, the compressor is mounted on the rubber pedestal provided on the substrate, and the band hung on the compressor is fixed to the substrate. Vibration can be absorbed, and vibration generated during operation of the compressor and noise generated by the vibration can be reduced.

According to a sixth aspect of the present invention, since the cooling device according to any one of the first to fifth aspects is provided, a compressor that is an obstacle to the flow of air is not disposed downstream of the fan. As a result, warm air can be reliably discharged from the storage space through the exhaust port, so that the warm air in the storage space is not supplied to the condenser again, and cooling is performed even in continuous operation in a hot and humid environment. The performance can be prevented from deteriorating.

According to the invention of claim 7 of the present invention, since the cooler is provided at the bottom of the serving car, the vehicle can run stably without increasing the overall height or the position of the center of gravity. .

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of a cooler of the present invention,
(A) is a plan view and (b) is a cross-sectional view.

FIG. 2 shows a condensing unit according to the first embodiment;
Is a plan view, and (b) is a side view.

FIG. 3 is a perspective view showing a condenser and a leg according to the first embodiment;

4 (a) is a perspective view, FIG. 4 (b) is a plan view, FIG. 4 (c) is a front view, and FIG. 4 (d) is a side view.

5A and 5B show the pedestal, and FIG. 5A is a front view and FIG. 5B is a perspective view.

FIG. 6A is a side view showing a state where the pedestal is attached to the leg, and FIG. 6B is a cross-sectional view showing a state where the pedestal is attached to the substrate.

FIGS. 7A and 7B show a state in which the compressor is attached to the substrate, in which FIG. 7A is a plan view, FIG. 7B is a front view, and FIG.

FIG. 8 is a cross-sectional view showing a state in which a pedestal is attached to a conventional substrate.

FIG. 9 shows a conventional condensing unit, wherein (a)
Is a plan view, and (b) is a side view.

FIG. 10 shows a conventional cooler, (a) is a plan view,
(B) is a sectional view.

FIG. 11 shows a state in which a cooler is mounted on a serving car, and (a)
(B) is a schematic front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust port 2 Storage space 3 Fan 4 Compressor 5 Condenser 6 Wind direction board 7 Substrate 8 Base 9 Band A Cooler B Serving car

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) A47B 31/00 A47B 31/00 H 31/02 31/02 D F25D 11/00 101 F25D 11/00 101A / / F25D 23/12 23/12 L (72) Inventor Yoji Akabane 1000 F, Toyoshina, Toyoshina-cho, Minamiazumi-gun, Nagano F-term in GC Corporation (reference) 3L045 AA01 AA07 BA01 CA02 DA02 PA04

Claims (7)

[Claims] 1. A cooling machine provided with a fan, a compressor and a condenser housed in a storage space having an exhaust port, wherein the fan, the compressor and the condenser are arranged in this order from the side closer to the exhaust port. Features a cooler. 2. The cooling machine according to claim 1, wherein the exhaust direction from the exhaust port is obliquely downward. 3. The cooling machine according to claim 1, wherein a wind direction plate is arranged near the exhaust port. 4. The cooling machine according to claim 1, wherein a sirocco fan is used as the fan. 5. The method according to claim 1, wherein the compressor is mounted on a rubber pedestal provided on the substrate, and a band hung on the compressor is fixed to the substrate. Cooler. 6. A catering vehicle comprising the cooler according to claim 1. Description: 7. The serving truck according to claim 6, wherein a cooling machine is provided at the bottom of the serving truck.