JPS62146532A - Fresh article storage apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fresh produce storage device that allows fresh produce such as vegetables and fruits to be stored for a long period of time at the production site or at the distribution stage.

BACKGROUND OF THE INVENTION Refrigerated storage is a common means of storing perishables, but in addition to this, a longer term storage method involves changing the air composition within the storage room. In other words, the concentration of oxygen (O2) in the storage chamber is reduced, and carbon dioxide gas (Co2) is
By increasing the concentration, it suppresses the respiration effect of fresh food,
It is also known that chemical reactions such as decomposition and oxidation caused by microorganisms can be prevented.As a storage method, for example, as shown in Japanese Patent Publication No. 60-12004, carbon-containing fuel is used. A gas generator that reduces the oxygen concentration in the storage by combusting it with a combustion device and introducing combustion exhaust gas into the storage, and a CO2 absorption tank (gas adjustment device) that adjusts the atmosphere inside the storage to a predetermined value. 〇On the other hand, in such perishables storage equipment, usually a cooling device is used to circulate cold air inside the warehouse to cool the perishables and adjust the atmosphere, making it possible to preserve them for a long time. Needless to say, the atmosphere must be adjusted to a predetermined level immediately after the fresh produce is stored, and it is desirable that the fresh produce is always kept under stable cooling conditions.

Problem to be Solved by the Invention However, in the above-mentioned fresh food storage apparatus, when adjusting the atmosphere inside the refrigerator, the cooled air inside the refrigerator is temporarily led out of the refrigerator, used for adjustment, and then returned to the inside of the refrigerator. In other words, as air with residual heat after CO2 desorption is returned to the chamber by the gas adjustment device, an increase in the temperature inside the chamber is unavoidable.Therefore, it is necessary to take measures such as installing a separate cooling device for the regulated gas. Although it is conceivable, it is extremely difficult to stably introduce the gas in a state near the internal air temperature due to fluctuations in the temperature of the adjusted gas due to the CO2 adsorption and desorption time of the gas adjustment device. Therefore, in view of the above problems, the present invention has been developed to It is an object of the present invention to provide a fresh food storage device in which the interior of the refrigerator can be kept under stable cooling conditions by an extremely simple method even when a regulating device is in operation.

Means for Solving the Problems In order to solve the above-mentioned problems, the fresh produce storage device of the present invention includes an exhaust pipe that circulates the air in the storage to the carbon dioxide gas generator, and a gas adjustment device to supply regulated gas into the storage. The introduction tube is heat exchanged.

Effects of the present invention With the above-described configuration, the regulated gas from the gas regulating device can be cooled at the exhaust pipe of the carbon dioxide gas generating device, which is at the internal air temperature, and introduced into the storage, so that the inside of the storage can be kept under stable cooling conditions. can be kept.

Example An embodiment of the present invention will be described below based on the drawings.

In the figure, 1 is a storage such as a prefabricated refrigerator for storing perishables, and a cooling device 7 comprising a compressor 2, a condenser 3, an evaporator 4, and blowers 5 and 6 is mounted on the top. The blower 5 cools the condenser 3, and the blower 6 forcibly circulates cold air from the evaporator 4 into the warehouse. Connected to the storage 1 are a carbon dioxide gas generator 8 for introducing carbon dioxide (CO2) into the storage, and a gas adjustment device 9 for keeping the atmosphere inside the storage in a constant state. Carbon dioxide gas generator 8
is constructed between an exhaust pipe 1Q through which air in the storage 1 circulates and an introduction pipe 11 through which combustion gas is introduced into the storage 1,
valve 12, blower device 13 (for example, sirocco fan),
It is composed of a combustion furnace 14.

The blower device 13 sends the air in the storage 1 to the combustion furnace 14 through the exhaust pipe 10, and sends the combustion exhaust gas from the combustion furnace 14 to the inlet pipe 11.
It circulates further into the storage 1. Also, combustion furnace 1
4 is a caning 16 with a ceramic tube 15 on its inner surface, a lid/cover 18 for placing solid fuel 17 inside the casing 16, and heating the air from the blower 13 to burn the solid fuel 1. It is composed of a secondary ignition heater 19. The solid fuel 17 is a high-purity carbon material such as charcoal, and when it is combusted, CO2 is generated as exhaust gas. Due to the reaction C+O2→CO2, the exhaust gas becomes only N2 and CO2, which are introduced into the storage 1. As the solid fuel 17 burns, the core temperature rises to about 900° C., and naturally the exhaust gas also becomes high in temperature. Therefore, the introduction pipe 11 is provided with a heat exchanger 20 for cooling. 21 is the discharge pipe 1
This valve is used to introduce outside air to continue burning the solid fuel 17 when the 1 to 02 concentration is extremely low.

On the other hand, the gas adjustment device 9 includes two adsorbers 22.23 equipped with heaters 38 and 39 on the outer periphery, an exhaust pipe 24, an inlet pipe 25, and a blower 26.2 through which the air inside the storage bottle 1 is alternately circulated.
It is composed of 7 valves 28-35. Adsorber 22.
23 is filled with activated carbon 36,37. 40
is a heat exchanger that exchanges heat between the exhaust pipe 10 of the carbon dioxide gas generator 8 and the inlet pipe 25 of the gas regulator 9.

The operation of the fresh food storage apparatus constructed as described above will be explained with reference to FIGS. 1 and 2.

Cooled to an arbitrary temperature by the cooling device 7 (for example, AT=2
℃) When fruits and vegetables are stored in the storage warehouse 1, the atmosphere inside the warehouse is the outside air atmosphere (N2 = 79 units, 02-21 units).
This is point A in the diagram. Here, the CAT enclosure (e.g. N2
-90 section, o2. = s%, Co2 = 6 (ly) The carbon dioxide gas generator 8 is activated in order to set the value to 0 in Fig. 2. Then, the air inside the refrigerator is introduced into the combustion furnace 14 via the introduction pipe 10, the valve 12, and the blower device 13, and is subjected to combustion. Exhaust gas from the combustion of the solid fuel 17, that is, N2 and CO2 gas, is introduced into the refrigerator, and O2 gradually decreases and CO2 increases.
The atmosphere inside the refrigerator is (N2='y9%, 02=1e%, co2
= 5%) When reaching point B in Figure 2, the CA atmosphere (N2 =
90%.

The gas regulator 8 is operated to control the temperature to 02=5%, C2=5%). The gas adjustment device 8 supplies air inside the refrigerator to the adsorber 2 through an introduction pipe 24, a blower 26, and valves 28 and 29.
2.23, it adsorbs CO2 from the CO2-excessive air inside the refrigerator, and returns to the interior of the refrigerator through the exhaust pipe 26. However, two adsorbers 22.2 filled with activated carbon 36.37
No. 3 has a structure in which one side is adsorbed and the other side is desorbed, since the adsorption capacity deteriorates when a certain amount of CO2 is adsorbed.

For example, when the adsorber 22 is performing adsorption and the adsorber 23 is performing desorption, the valves 28, 34, and 31.33 are open, and the valves 29, 35, and 30.32 are closed, and the blower 26 generates CO2. Excess air in storage 1 is removed from adsorber 2.
Activated carbon 36 in the adsorber 23 is passed through and returned to the inside of the refrigerator, while activated carbon 37 in the adsorber 23 with poor adsorption capacity is passed through outside air by a blower 27, and is returned to the inside of the refrigerator by a heater 39 provided on the outer periphery.
By energizing, a cycle of not heating and desorbing CO2 is performed alternately, and the excess Co2 in the refrigerator is controlled to 6%. Here, the air controlled by the gas regulator 8 is once led out to the outside of the refrigerator, and its temperature has increased.
When the air passes through the adsorbers 22 and 23 immediately after desorption, the temperature has increased due to residual heat from the heaters 38 and 39, and the air returns to the storage 1 through the exhaust pipe 25. Heat exchange is performed with the introduction pipe 1Q of the generator 8. heat exchanger 4
0, it is cooled to the internal temperature. In other words, the air inside the refrigerator whose temperature has increased after passing through the gas regulator 9 is cooled by the air inside the refrigerator passing through the introduction pipe 1o of the carbon dioxide generator 8.
It is cooled to around the internal temperature and returned to the storage 1.

Effects of the Invention As described above, the present invention exchanges heat between the exhaust pipe of the gas regulating device and the inlet pipe of the carbon dioxide generator, thereby cooling the high temperature regulating gas and creating a stable atmosphere inside the refrigerator. Cooling conditions can be maintained, and there is no need to separately install a cooling device to lower the unstable temperature of the regulating gas to a predetermined value.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a fresh produce storage device according to an embodiment of the present invention, and FIG. 2 is a diagram showing the air atmosphere and operation of the device. 1...Storage, 7...Cooling device, 8.
... Carbon dioxide gas generator, 14 ... Combustion furnace, 13 ... Air blower, 9 ... Gas adjustment device, 11 ... Discharge pipe , 25...introduction pipe, 40...heat exchanger. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Diagram N Question (h)

Claims (1)

[Claims] A storage for storing perishables, a cooling device for cooling the inside of this storage, and a combustion furnace for burning fuel containing carbon to introduce carbon dioxide gas into the storage, and supplying air from the storage for combustion of the fuel. a carbon dioxide gas generating device comprising a blower device for circulating air; a gas regulating device for adjusting the atmosphere in the storage to a predetermined value; a discharge pipe for circulating the air in the storage to the carbon dioxide gas generating device; A fresh produce storage device in which an introduction pipe for introducing a regulated gas into the storage by a gas regulating device is heat exchanged.