KR100439318B1 - Pressure pre cooling system and control method - Google Patents

Abstract

The present invention relates to a tunnel-type differential pressure precooling device and a control method thereof, by using a transfer conveyor to automate a work process for continuous low temperature maintenance from receiving to pre-cooling and shipping to reduce labor due to pre-cooling. The tunnel structure is designed to shorten the pre-cooling time so that fresh high-quality fruits and vegetables can be stored for a long time.

In the present invention precooling device for realizing this, the receiving door (1) and the delivery door (2) which is opened and closed by sliding in the vertical direction on both sides of the pre-cooling chamber (3) are provided; Transfer conveyors 1a, 2a and 3a for the transfer of precooling materials are connected to the outside of the entrance and exit doors 1 and 2 and inside the precooling chamber 3, respectively, in a plurality of rows; The inside of the precooling chamber 3 is divided into upper and lower spaces by the blocking film 8, and a cold air hole 8a is provided at the center of the blocking film to enable cold air circulation between the upper and lower spaces at a position between the transfer conveyors 3a. Formed; On both sides of the conveyance conveyor (3a) of the upper space is provided with a differential pressure fan (4) for forced circulation of cold air; The lower part of the conveyance conveyor (3a) of the lower space is characterized in that the unit cooler (5) for the forced circulation of cold air and the generation of cold air is provided.

Description

Tunnel type differential pressure precooling device and its control method {PRESSURE PRE COOLING SYSTEM AND CONTROL METHOD}

The present invention relates to a differential pressure precooling device and a control method thereof, and more particularly, to prevent the damage and freshness of the fruit by inhibiting the respiratory action and metabolism of the fruits and vegetables to be cooled quickly after harvesting the cooled object such as fruits and vegetables. It relates to a tunnel-type differential pressure precooling device for.

In general, fruits and vegetables are breathed using the stored nutrients in the body to maintain life even if nutrition from the outside is stopped after harvesting, resulting in deterioration of quality such as decay and softening, resulting in deterioration of merchandise and food value. Let's go. Breathing physiology of fruits and vegetables is more active as the temperature of the outside air increases, and as the temperature rises to 10 ° C, the respiration rate is increased 3 to 4 times and quality deterioration occurs rapidly. Therefore, it is necessary to immediately lower the temperature of the fruits and vegetables to 3 ~ 10 ℃ harvest immediately to suppress respiration.

However, when the fruits and vegetables are stored in the general low temperature storage room without pre-cooling, it takes a lot of time to cool down to the temperature necessary for stopping the breathing of the fruits and vegetables, and the quality of the fruits and vegetables are temporarily lost in the cold storage. In the case of importing into the cold storage, the cooling load of the cold storage is increased, thereby greatly degrading the performance of the cold storage, and the time required for the cooling treatment is increased. Therefore, in order to make up for the shortcomings of the cold storage, a rapid pre-cooling apparatus is required to rapidly cool down to the cooling temperature required for stopping the breathing of fruits and vegetables.

In addition, since the cooling conditions necessary to stop breathing of the pre-cooled fruits and vegetables can be effectively maintained to maintain effective quality, there must be a connection with the low-temperature storage, and the pre-cooling time should be shortened as much as possible to prevent deterioration of freshness and quality of the fruits and vegetables. can do.

On the other hand, conventionally, in order to transfer to a cold storage after the pre-cooling, a forklift or a person must enter the pre-cooling and take out the fruits and vegetables and move to the low temperature storage.In this process, the fruits and vegetables are exposed to room temperature, condensation occurs, If the forklift is used, the precooling room requires a forklift operation space other than the storage space of the fruits and vegetables, and thus the facility space increases, thereby increasing the freezer load, thereby decreasing the cooling efficiency.

In addition, in the case of using the manpower as described above, there is a problem in that a lot of labor force and excessive time required for loading and transporting, damage due to condensation during the transfer process, and the like.

In addition, the conventional precooler has a disadvantage in that the cold air generating unit or the differential pressure occupies a part of the precooling chamber, thereby reducing the storage space of fruits and vegetables. Although it is efficient in the unit, it is impossible to apply due to the small amount of precooling in the farms and mountain processing centers that are produced on a large scale.

The present invention has been proposed to improve the above-mentioned problems, and the differential pressure pre-cooling apparatus and its control method for maintaining a high quality fresh even if the fruits and vegetables are distributed for a long time by allowing easy use and effective pre-cooling in a short time. The purpose is to provide.

1 is a schematic configuration perspective view of the present invention precooling device.

Figure 2 is a perspective view of a state wearing the fruit and vegetable packaging box in the present invention pre-cooling device.

Figure 3 is a state diagram showing the pre-cooling operation of the pre-cooling device of the present invention.

Figure 4 is a plan view of the present invention pre-cooling device.

Figure 5 is a side cross-sectional view showing the operation of the pre-cooling device of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: wearing door 2: shipping door

3: precooling chamber 4: differential pressure fan

5: unit cooler 6: freezer

8: barrier film 9: differential pressure sheet

10: winding roll 11: packing box

The object is that the receiving door and the delivery door which is opened and closed sliding in the vertical direction on both sides facing each other of the pre-cooling chamber is installed; Transfer conveyors for transfer of pre-cooled materials are connected to the outside of the entrance and exit doors and inside the pre-cooling chamber, respectively, and are installed in a plurality of rows; The interior of the precooling chamber is divided into upper and lower spaces by a blocking membrane, and a cold air hole is formed at the center of the blocking membrane to enable cold air circulation between upper and lower spaces at a position between transfer conveyors; The upper space is provided with a differential pressure fan for forced circulation of cold air; The lower space is achieved through a tunnel type differential pressure precooling device, characterized in that the unit cooler for forced circulation and cold air generation of cold air is provided.

Hereinafter, a specific embodiment of the differential pressure precooling device of the present invention will be described with reference to the accompanying drawings.

Figure 1 shows the internal configuration of the pre-cooling device according to the present invention, the door does not display the shipping side for the sake of understanding, Figure 2 shows a state in which the packaging box is worn.

First, looking at the overall configuration, the pre-cooling chamber (3) of the present embodiment is made of a heat insulating wall, and the doors 1 and the door 2 are installed on both sides of the wall facing each other so as to slide open and close in the vertical direction. The conveying conveyors 1a, 2a, and 3a were arranged in two rows along the loading and exit directions of the load. The receiving door (1) and the delivery door (2) was to move up and down by chain operation along the guide by combining five insulation panels to automate the entry and exit operations.

In the precooling chamber 3, a barrier film 8 having a cold air hole 8a formed in the center is formed in the upper and lower spaces, and the cold air is discharged and the cold air is discharged from the lower portion of the barrier film 8. The unit cooler 5 for forced circulation through the cold air vent 8a is installed, and the differential pressure fan 4 and the differential pressure sheet 9 for forcibly circulating the lower cold air to the upper space of the barrier film 8 are wound up. Winding rolls 10 are formed on both sides.

On the other hand, the refrigerator 6 was provided outside the precooling chamber 3, and reference numeral 12 denotes a control panel.

Looking at the effects of the operation control of the differential pressure pre-cooling device having such a configuration as follows.

First, the pallet 13 loaded with the fruit and vegetable packing box 11 is placed on the inlet conveyor 1a by using a forklift, and when the operator operates the power switch of the control panel 12, the receiving door of the precooling chamber 3 is placed. (1) is opened by sliding, the delivery conveyor (1a) and the conveying conveyor (3a) in the pre-cooling chamber (3) in the state that the receiving door (1) is fully raised to start the operation of the pallet ( 13) is automatically transferred to the precooling chamber (3) while correcting the position.

In this way, when the pallet 13 entering the precooling chamber 3 reaches the precooling position, the transfer conveyor 3a stops operation, and when the receiving door 1 descends and closes again, the winding roll 10 is released and the differential pressure is released. The sheet 9 is covered over the packaging box 11 as shown in Figs. 2 and 5, and then the refrigerator 6, the unit cooler 5, the differential pressure fan 4 are operated and cooling of the fruits and vegetables is started. Lose.

That is, the low pressure part space is formed in the center part of the blocking film 8 in which the cold air | gas opening 8a is formed by the packing box which is piled and covered on two loads, and the differential pressure sheet 9 descends, When the air sucked into the lower space through 8a) is discharged to the differential pressure fan 4 installed at both ends, the air cooled by the differential pressure fan 4 is discharged to the upper space of the precooling chamber 3. At this time, as the pressure increases due to the cooling air discharged from the precooling chamber 3, the differential pressure sheet 9 is in close contact with the packing box 11, and air is introduced into the openings of the upper and front and lower lower portions of the cold air vent 8a. As it is blocked, the pressure of the central cold air hole (8a) is lowered so that the cooling air in the pre-cooling room passes through the cooling holes inside and through the air vents installed on both sides of the packing box, and to the central cold air hole (8a). The forced circulation which flows, is sucked into the unit cooler 5, cooled, and discharged to the precooling chamber 3 again through the differential pressure fan 4 side is continuously performed.

Therefore, the cooling air discharged from the unit cooler 5 is forcibly blown into the precooling chamber 3 by the differential pressure fan 4 so that the pressure in the precooling chamber is high and the pressure in the cold air vent 8a space between the loads is low. Cooling air flows rapidly through the vents of the packing box while cooling the fruits and vegetables directly, thereby rapidly cooling the fruits and vegetables and preventing cold damage.

In this manner, when the precooling operation is completed for a predetermined time, after the operation of the unit cooler 5 and the differential pressure fan 4 is stopped, the winding roll 10 is wound again, and the differential pressure sheet 9 is raised, and the delivery door 2 When is opened to rise, the conveying conveyor (3a) and the delivery-side conveying conveyor (2a) in the precooling chamber (3) is operated to discharge the pallet 13 is subjected to precooling is performed.

The pre-cooling device of the present invention is the same as the above operation is reduced from pre-loading to pre-cooling, the delivery process, the pre-cooling time is shortened, thereby maximizing the pre-cooling efficiency, and settles the pre-refrigeration industry that is the most basic of low-temperature distribution system It can be seen that it can contribute to the increase of farm household income by promoting the production of fresh high quality fruits and vegetables.

On the other hand, the pre-cooling for the actual crop in the pre-cooling device of the present invention, the results are as shown in the following [Table 1].

division Product temperature (℃) Cooling time (time) Cooling rate (℃ / hour) Cooling rate (1 / hr) Early End Strawberry 23.3 4.2 1.8 10.6 1.57 peach 26.6 5.0 3.0 7.2 1.43 tomato 31.3 10.0 2.3 9.3 1.56 Highland Cabbage 20.2 4.4 2.6 6.1 1.32

As shown in the above results, the cooling rate for each crop was 1.57 for strawberries, 1.56 for tomatoes, 1.43 for peach, and 1.32 for high-fried cabbage, indicating that the cooling rate was lower as the heat transfer distance from the outer surface to the center of the precooled water increased. The cooling rate of cabbage with many leaves and leaves was lower than that of fruits.

In the above description, a configuration apparatus according to a specific embodiment of the present invention has been described and illustrated, but it is obvious that the differential pressure precooling apparatus of the present invention may be variously modified and implemented by those skilled in the art.

However, such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments shall fall within the appended claims of the present invention.

The present invention as described above, it is possible to reduce the labor force according to the pre-cooling operation by automating the work process for maintaining a continuous low temperature from the receipt to pre-cooling, the delivery using the transfer conveyor.

In particular, the operation of the entire process can be manually and automatically operated, and the entire process is automated so that anyone can easily and safely handle and operate.

In addition, by shortening the pre-cooling time through the tunnel-type structure it is possible to preserve fresh fruits and vegetables of high quality for a long time, it is possible to reduce the energy required for the pre-cooling operation.

Claims (4)

The receiving door 1 and the delivery door 2 which slide up and down and open and close are installed on both sides of the precooling chamber 3 opposite to each other, and the differential pressure sheet 9 is wound around the inner upper part. The plurality of take-up rolls 10 are configured at positions opposed to each other; Transfer conveyors (1a, 2a, 3a) for the transfer of precooling materials are connected to the outside of the entrance and exit doors (1, 2) and inside the precooling chamber (3), respectively, in a plurality of rows; The interior of the precooling chamber 3 is divided into upper and lower spaces by the blocking film 8, and at the center of the blocking film, cold air holes 8a to allow cold air circulation between upper and lower spaces at positions between the transfer conveyors 3a. ) Was formed; On both sides of the conveying conveyor (3a) of the upper space is provided with a differential pressure fan (4) for forced circulation of cold air; Tunnel type differential pressure pre-cooling device, characterized in that the lower part of the conveying conveyor (3a) of the lower space is provided with a unit cooler (5) for forced circulation of cold air and the generation of cold air connected to the freezer (6) on the outdoor side. The method according to claim 1, The receiving door (1) and the delivery door (2) is a tunnel-type differential pressure pre-cooling device, characterized in that a plurality of insulating panels are combined. delete In controlling the precooling device operated by the operation of the control panel, A receiving step in which the pallet is loaded into the precooling chamber by operating the conveyor in the receiving side conveyor and the precooling chamber when the receiving door is opened while the pallet loading the packing box on the receiving side conveyor is loaded; When the wearing door is closed after wearing the pre-cooling chamber, the winding rolls respectively installed on the upper sides of both sides are released, and the pressure drop sheet descends to cover the packing box; A pre-cooling step in which a refrigerator, a unit cooler, and a differential pressure fan are operated after the differential pressure sheet is lowered to cool the pre-cooling chamber for a predetermined time; When the pre-cooling set through the pre-cooling step is completed, the exit door is opened and at the same time the conveyor in the pre-cooling chamber and the exit-side conveyor is operated to discharge the pallet to the outside; tunnel type differential pressure pre-cooling device characterized in that the proceeding continuously Control method.