JPS6040592B2 - Differential pressure draft cooling method and differential pressure draft cooling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a differential pressure ventilation cooling method and a differential pressure ventilation cooling device. The objects to be cooled are piled up in two blocks with a certain interval between them, the gap formed by the objects to be cooled is covered with an airtight sheet, and the closed end of the object to be cooled is connected to a suction section provided on the side wall surface of the refrigerator. The air in the closed space is sucked by the aforementioned suction unit so that the air pressure inside the closed space becomes a negative pressure with respect to the air pressure inside the refrigerator outside the object to be cooled. Inside the refrigerator, the cold air inside the refrigerator on the outside is guided into the closed space through minute gaps between objects to be cooled, sucked out of the suction part on the side wall of the refrigerator, and returned to the inside of the refrigerator. The space can be used effectively with a considerable degree of freedom, and in addition, compared to the conventional differential pressure ventilation cooling method, the distance and flow amount of cold air into the object to be cooled are increased, making it more uniform. The present invention relates to a differential pressure ventilation cooling method that can quickly cool objects to be cooled, and a differential pressure ventilation cooling device that is directly used in the method.

The differential pressure ventilation cooling method is a method in which agricultural products or other items placed in containers with ventilation holes are stacked closely together in a ventilation path.
By suppressing the wind speed of the cold air and converting the velocity energy into pressure, the static pressure of the cold air is sufficiently increased to allow the cold air to penetrate into the narrow gaps of stacked produce, etc., and to uniformly and efficiently cool down to the inner layers. It is an attempt to close the gap.

However, one of the conventional cooling devices using the differential pressure ventilation cooling method is the side wall 1 of a refrigerator as shown in FIG.
0 etc. is made into a double wall with a hollow inside, and the ventilation hole 12 is closed over the entire inner wall surface of the double wall.
1. An object 16 to be cooled, such as agricultural products or something put in a container with ventilation holes, is brought into contact with the inner wall surface along the 1
In addition to stacking the blocks densely, a retractable non-ventilated shutter 18 provided at the top of the inner wall 14 allows the upper surface of the inner wall 14, which does not come into contact with the object 16 to be cooled, to be covered by the shutter 1.
8, and the air inside the refrigerator is pumped through the vent hole 12 provided in the inner wall 14 using a pressure fan 24 or the like so that the air pressure in the cavity 22 inside the double wall becomes negative pressure with respect to the air pressure inside the refrigerator. The cooled air inside the refrigerator penetrates through the gaps between the stacked objects 16 to be cooled, passes through the ventilation holes 12, and enters the cavity 22 inside the double wall.
The flowing air is returned to the inside of the refrigerator via a pressure fan 24.

However, in the above cooling method and cooling device, since the objects to be cooled are stacked closely in one block, the objects to be cooled are
If stacked thickly against the inner wall 14 surface having the ventilation holes 12 of No. 6, the distance through which the cold air flows will become longer and the amount of airflow will decrease, which may reduce the cooling effect or cause the cold air to circulate in one direction, resulting in uneven cooling. occurs.

In addition, it is necessary to stack the objects 16 to be cooled closely along the inner wall 14 surface having the ventilation holes 12 in contact with the wall surface, and since the objects 16 to be cooled cannot be stacked freely in the refrigerator, the space inside the refrigerator is saved. There are disadvantages such as not being able to be used effectively, and also being uneconomical in terms of running costs, as it is not easy to carry the objects to be cooled into and out of the warehouse using a forklift or the like. Therefore, in order to eliminate the above-mentioned drawbacks, the present invention provides a suction section that sucks the cold air inside the refrigerator to the outside of the refrigerator only in a part of the side wall surface of the refrigerator, and the objects to be cooled are placed on both sides of the suction section inside the refrigerator. The objects to be cooled are stacked in two blocks with a gap between them, and the gap is covered with an airtight sheet to form a closed space inside the stacked objects to be cooled, the end of which communicates with the suction section provided on the side wall surface of the refrigerator. The air inside the closed space is sucked through the suction section on the side wall surface so that the air pressure inside the closed space is negative compared to the air pressure inside the outside of the storage, and the cold air inside the storage of the items to be cooled is absorbed into the storage to be cooled. It sews through minute gaps and leads into the closed space.
The space inside the refrigerator can be used effectively by stacking objects to be cooled inside the refrigerator with a considerable degree of freedom, which draws air from the suction part to the outside of the refrigerator and returns it to the inside of the refrigerator. A differential pressure ventilation cooling method that can uniformly and rapidly cool objects to be cooled by increasing the distance and flow amount of cold air into the object compared to the conventional cooling method, and the differential pressure ventilation method used therein. The purpose is to provide a cooling device.

Embodiments of the present invention will be described below with reference to the drawings.

A side wall 32 of a refrigerator 30 is made into a double wall, and a duct 34 is formed inside thereof.

A suction part 36 for sucking air from one or more refrigerators into a duct 34 in the side wall 32 is closed at a predetermined portion of the lower part of the side wall 32 inside the refrigerator. One or more pressure fans 38 are installed at the upper part of the side wall 32 inside the refrigerator 30 to forcefully return the air in the duct 34 inside the double wall to the inside of the refrigerator 30. This ensures that the air pressure in the duct 34 provided within the double wall is always negative. An airtight sheet 4 is provided on the inner wall surface of the double-walled side wall 32 to cover a part of the object to be cooled 40 piled up near the suction section 36.
2 is provided at an appropriate position on the inner wall surface with its green end fixed.

A cooling device 44 is installed inside the refrigerator 30 or outside the refrigerator 30, for example, inside the above-mentioned double-walled duct 34, so that the air flowing back into the refrigerator is cooled by the cooling device. With the above structure, as shown in FIG. 2, objects to be cooled 40, such as agricultural products or objects placed in containers with ventilation holes, are placed on both sides of the suction section 36 at the bottom of the side wall 32 inside the refrigerator. Two blocks are stacked at a certain interval, and the upper surface of the space between the objects to be cooled 40 is covered with an airtight sheet 4.
2 to form a closed space 46 in the object to be cooled 40 whose entrance end communicates with the suction part 36 provided on the side wall 32 inside the refrigerator, and to form a closed space 46 in the object to be cooled 40 that is closed against the air pressure inside the refrigerator outside the object to be cooled 40. The air in the closed space 46 is sucked from the suction part 36 on the side wall 32 by the pressure fan 38 so as to make the atmospheric pressure in the space 46 negative, and the cold air inside the refrigerator outside the objects 40 to be cooled is transferred to the objects to be cooled. 40 minute gaps and lead to the duct 34 inside the double wall.
The airflow is returned to the inside of the refrigerator 30 by the pressure fan 38.

In the above embodiment, the side wall 32 is made of a double wall in order to return the flowing air sucked out of the refrigerator from the suction part 36 provided on the side wall 32 of the refrigerator 30 into the refrigerator, and the gap between the walls is is used as the duct 34, but the invention is not limited to this, and the side wall surface is not a double wall, and the side wall surface is not made into a double wall. A cylindrical duct may be installed for communication.

In this case, the pressure fan 38 is provided at the lower part of the side wall 32 of the duct 34 at the joint with the suction part 36 or at the middle of the duct 34, and the upper end of the duct 34 is connected to the refrigerator 30.
It may also be introduced directly into the refrigerator from the side wall 32 of the refrigerator. Further, as shown in Fig. 3, one or more suction parts 36 provided at the lower part of the inside wall 32 of the refrigerator are opened horizontally in a long strip shape,
The suction part 36 is provided with a shielding means 50 whose number and area can be freely adjusted, for example, an airtight frame is fitted into the suction part 36 surface, or an airtight shielding means 50 is provided on the suction part 36 surface. A door that slides along the suction section 36 may be provided, or an airtight shutter may be provided on the inside wall 32 of the chamber above the suction section 36, and the airtight shutter may cover an appropriate portion of the surface of the suction section 36. Alternatively, the number and area of the suction parts 36 may be adjusted by sandwiching them between the stacked objects 40 to be cooled and the surface of the suction parts 36 with a shielding boat. Further, the airtight sheet 42 used to form a closed space within the object to be cooled 40 may be prepared separately without having its green end fixed to the inner wall surface of the refrigerator as in the above-described embodiment.

As described above, according to the differential pressure ventilation cooling method according to the present invention and the differential pressure ventilation cooling device directly used therefor, the object to be cooled or the ventilation holes are densely provided on the entire inner wall surface of the refrigerator, as in the conventional refrigerator. There is no need to stack the items in the container, and small blocks are stacked on both sides of the suction section installed at the bottom of the inner wall of the chamber, so a passage is provided between the stacked objects to be cooled inside the chamber. Not only can a forklift or the like freely enter the warehouse to carry and stack the objects 40 into the warehouse, or take them out of the warehouse, but also it is possible to easily move the objects 40 to be cooled depending on their size. Various blocks can be piled up efficiently in the warehouse with a considerable degree of freedom depending on the type, etc., and the entire interior of the warehouse can be used effectively.

In addition, according to the differential pressure ventilation cooling method, the object to be cooled is cooled separately in small blocks, so compared to conventional methods, the distance through which cold air flows is smaller, and the flow resistance is lower. As a result, a large amount of cold air is diluted into the object to be cooled, and the object to be cooled can be cooled uniformly, efficiently, and rapidly without any one-way rotation of the cold air.
Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. That's true.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway explanatory diagram of a conventional differential pressure ventilation cooling device, and FIG. 2 is a partially cutaway explanatory diagram of the differential pressure ventilation cooling device according to the invention. It is a perspective explanatory view. Further, FIG. 3 is a perspective explanatory view showing the internal structure of a differential pressure ventilation type cooling device in which the suction portion is elongated in a strip shape and a shielding means is provided. 10, 32...Side wall, 12...Vent hole, 14...Inner wall, 16,40...Object to be cooled, 18... Shutter, 22...Cavity, 24, 38...Pressure fan, 30...
Refrigerator, 34...Duct, 46...Closed space, 36...Suction section, 42...Airtight sheet, 44...Cooling device. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a refrigerator, items to be cooled are piled up in two blocks with a certain gap in the middle, and the gap is covered with an airtight sheet leaving a part of the opening to form a closed space. , the air inside the closed space is sucked through the opening, and the cold air outside the object to be cooled is sucked in so that the air pressure inside the closed space becomes a negative pressure relative to the air pressure inside the refrigerator outside the object to be cooled. A differential pressure ventilation cooling method that is characterized by guiding objects into a closed space through minute gaps and returning them to the inside of the refrigerator through an opening. 2. The differential pressure ventilation cooling method according to claim 1, wherein the air flowing back into the refrigerator from the opening is cooled by a cooling device. 3 A suction force that opens at least in the lower part of the side wall surface in the height direction is provided in a part of the length direction of a certain side wall surface in the refrigerator, and a duct that leads from this suction section to the inside of the refrigerator through the outside of the side wall surface. A pressure fan is provided at the end or middle part of the duct to return the flowing air sucked from the suction part into the refrigerator, and the fan is provided so as to extend forward on both sides of the suction part, and one end of each is attached to the side wall surface. The objects to be cooled are piled up in two blocks with a certain gap in the middle in the refrigerator so as to cover the upper opening between the blocks and the opening on the opposite wall side so that the objects are in close contact with each other in front of the suction part. A differential pressure ventilation type cooling device characterized in that an airtight sheet is provided to form a closed space communicating with a suction section. 4. The differential pressure ventilation type cooling device according to claim 3, wherein the side wall surface of the refrigerator is doubled as a duct, and the gap therebetween is utilized.