JPS62248428A - Perishable food 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 Industrial Application 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, there is storage that changes the air composition within the storage room as a longer-term storage method. In other words, the concentration of oxygen (O2) in the storage chamber is reduced and the concentration of carbon dioxide (CO2) is reduced.
) It is known that by increasing the concentration, it is possible to suppress the respiration of fresh foods, and also to prevent chemical reactions such as decomposition and oxidation caused by microorganisms (hereinafter referred to as O
(referred to as A storage). As shown in Japanese Patent Publication No. 60-12004, for example, this OA storage method burns carbon-containing fuel in a combustion device and introduces the combustion exhaust gas into the storage to reduce the oxygen concentration in the storage. A gas generator that reduces CO2 and maintains the atmosphere inside the refrigerator at a predetermined value.
It consists of an absorption tank (gas adjustment device).

On the other hand, in such perishables storage equipment (CA storage equipment), a cooling device is usually used to circulate cold air inside the warehouse, allowing perishables to be stored for a long time by cooling and adjusting the atmosphere.
For this purpose, it goes without saying that 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.

Problems to be Solved by the Invention In the fresh food storage apparatus as described above, when adjusting the atmosphere inside the warehouse, for example, when the CO2 concentration reaches a predetermined value at 6% and the O2 concentration is reduced to 6%, the The air in the air is sent to the incineration furnace, where the O2 in the air is changed into CO2, and this air is introduced into one of the two adsorbers of the gas adjustment device, and the adsorbent filled inside is used to convert the air into CO2. The adsorbent was regenerated by adsorbing the CO2 inside and returning it to the inside of the chamber, and using a vacuum pump etc. to remove the CO2 adsorbed to the adsorbent.

However, when the amount of Co2 desorbed by regeneration is small compared to the amount of Co2 adsorbed, there is a problem in that the adsorbent's ability gradually decreases and it becomes unable to function satisfactorily as a gas regulating device. .

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a fresh food storage device that can quickly adjust the inside of the refrigerator to a predetermined atmosphere.

Means for Solving the Problems In order to solve the above problems, we have provided a storage for storing perishables, a cooling device for cooling the inside of this storage, and a carbon-containing fuel to introduce carbon dioxide gas into the storage. a carbon dioxide gas generating device comprising a combustion furnace for burning the fuel; a blower for circulating air from the storage into the combustion furnace; and a plurality of adsorption units for adjusting the atmosphere in the storage to a predetermined value. The adsorbent in the adsorber is equipped with a gas regulating device consisting of a chamber and a blower device that circulates the combustion gas from the combustion furnace to the adsorber, and after the inside of the chamber reaches a predetermined atmosphere, the adsorbent in the adsorber is removed. It is designed to play over a long period of time.

Effect of the present invention With the above-described configuration, after the inside of the refrigerator becomes CA atmosphere, the carbon dioxide gas generator is stopped and the amount of 002 adsorbed by the gas adjustment device is controlled by the respiration of the fresh food stored in the refrigerator. Because most of the CO2 produced is very small, and one adsorber can be operated for a long time, it is possible to take a long time to regenerate the adsorbent in the other adsorbent. As a result, the adsorbent can be regenerated sufficiently, so that failure of the gas regulating device due to deterioration of the adsorbent can be prevented, and the period for replacing the adsorbent can be extended.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

In the figure, 1 is a storage such as a prefabricated refrigerator for storing perishables, and a compressor 2. Condenser 3° Evaporator 4. A cooling device 7 consisting of blowers 6, 6 is mounted on the top. The blower 6 cools the condenser 3, and the blower 6 forcibly circulates cold air from the evaporator 4 into the warehouse. The storage 1 is connected to 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 constant. Carbon dioxide gas generator 8
is an introduction pipe 10 that introduces air in the storage 1, and a pulp 1.
1.12, the pulp 14. It is composed of a blower device 16 (for example, a sirocco fan) and a combustion furnace 16. The blower device 15 sends the air in the storage 1 through the introduction pipe 10 to the combustion furnace 16, and sends the combustion gas in the combustion furnace 16 to the pulp 11.
By switching ゜12, the inside of the refrigerator or the gas adjustment device 9
It is intended to be introduced to The combustion furnace 16 also includes a casing 18 with a ceramic tube 17 on its inner surface, and a lid/cover 20 on which a solid fuel 19 is placed within the casing 18.
and an ignition heater 21 for heating the air from the blower 15 and burning the solid fuel 19.

The solid fuel 19 is a high-purity carbon material such as charcoal, and when it is combusted, CO2 is generated as a combustion gas. In other words, C+
In the reaction of 02→C02, the combustion gas becomes ) and CO2.

Reference numeral 22 indicates an extremely low false concentration from the inlet pipe 10, pulp for introducing outside air to continue combustion of the solid fuel 19, and reference numeral 23 indicates a heat exchanger for cooling the discharge pipe 13.

On the other hand, the gas adjustment device 9 includes two adsorbers 24 and 26,
Inlet pipe 26 for sending combustion gas to gas regulator 9, storage 1
Exhaust pipe 27. Blower 28° Vacuum pump 29. It is composed of pulps 30 to 36. Adsorber 24.25
The inside is filled with activated carbon 36°37. Further, 38 is an introduction pipe for directly sending air from inside the warehouse to the gas adjustment device 9, and 39 is a pulp, which is initially in a closed state.

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 perishables are placed in the storage 1, the atmosphere inside the storage 1 is an outside air atmosphere (N2=79%).

02=21%), which is point A in Figure 2. Here C
A atmosphere (e.g. N2=so%, Co2=s%, 02=
5%), the carbon dioxide gas generator 8 is activated in order to make the point 0 in FIG. Then, the air inside the warehouse flows through the inlet pipe 10° and the pulp 14.
．． The air is introduced into the combustion furnace 16 via the blower 16 and subjected to combustion. Combustion gas from the combustion of solid fuel 19, that is, N
The gases 2 and Co2 are introduced into the chamber with the pulp 11 open and the pulp 12 closed, and 02 gradually decreases and CO2
2 increases.

At this time, the combustion gas generated by combustion of the solid fuel 19 has a high temperature, so the exhaust pipe 13 is cooled by the heat exchanger 23. The atmosphere inside the refrigerator is (N2=79%, 02=1e%
, CO2 = s %) ft1c 2 Figure 3 point K reached f le (!: OA atmosphere (N2 = 9o%, 02
= s%, Co2 = s%), the gas regulator 9 operates, the pulp 12 opens, the pulp 11 closes, and the combustion gas is sent to the gas regulator 9. The gas adjustment device 9 introduces combustion gas into an inlet pipe 26. Air blower 28. Pulp 30.33
Co2 is introduced into one of the adsorbers 24.25 through
Excessive combustion gas Co2 is adsorbed and returned to the inside of the refrigerator through the exhaust pipe 27. However, the adsorption capacity of the two adsorbers 24 and 26 filled with activated carbon 36 and 37 deteriorates after adsorbing a certain amount of CO3, so one adsorbs and the other desorbs. For example, when the absorber 24 is performing adsorption and the adsorber 26 is performing desorption, the pulp 30, 32,
34 is open.

Pulp 31, 33, 35 is closed and blower device 2
8, the combustion gas containing too much Co2 is passed through the activated carbon 36 in the adsorber 24 and returned to the inside of the chamber. On the other hand, the activated carbon 37 in the adsorber 26, which has poor adsorption capacity, is activated by the vacuum pump 29 to perform a cycle in which Co2 is desorbed. Do this alternately to reduce the amount of Co in the chamber.
2 concentration is controlled at 6%.

Kokote, the inside of the refrigerator is CAW air (N2-90%, 02-s4
．． When CO2=s%) reaches point C in FIG. 2, the operation of the carbon dioxide generator 8 is stopped and the pulp 12 is closed. As a result, Co is transferred from the carbon dioxide gas generator 8 to the gas adsorption device 9.
2 will no longer be sent.

In this state, the atmosphere inside the refrigerator is N2-90C, 0
2-schi, Co2-5chi has been maintained for a while,
Due to the respiration of fresh food stored in the refrigerator, the C inside the refrigerator
O2 concentration increases. At this time, by opening the pulp 39, air inside the warehouse is introduced into the gas adsorption device 9 through the introduction pipe 38.

At this time, if the gas adsorption device 9 is operated with the adsorber 24 on the adsorption side and the adsorber 26 on the regeneration side, the pulp 30.32.
34 is open, pulp 31, 33.35 is closed, vacuum pump 2
9 is the operating state. However, since the amount of CO emitted from perishables stored in the refrigerator is very small, the interior of the refrigerator has a CA atmosphere (
N2=90chi, 0°-s%, Co2=s%) is shown in Figure 2C.
It is not necessary for the adsorbers 24, 25 to repeat the adsorption/desorption cycle in a short period of time until the point is reached. For example, 10
If it is under a fresh produce storage device with a storage area of 1.5 sq.
s%) K, the adsorber 24.25 needed to switch between adsorption and desorption in about 16 minutes, but this switching time was only 16 minutes due to the respiration of the fresh food stored in the warehouse.
The time will be 150 minutes, which is about 0 times longer. As a result, the adsorber 24.
25 can be regenerated for a long time, the adsorbents 36 and 37 hardly deteriorate, and it is possible to prevent failure of the gas adjustment device 9 due to the deterioration of the adsorbents 36 and 37, and the period for replacing the adsorbents becomes longer.

Effects of the Invention The present invention provides a storage for storing perishables, a cooling device for cooling the inside of this storage, a combustion furnace for burning fuel containing carbon to introduce carbon dioxide gas into the storage, and this combustion furnace. a carbon dioxide gas generating device comprising: a blower for circulating air from the storage to be used for combustion of the fuel; a plurality of adsorbers for adjusting the atmosphere in the storage to a predetermined value; It is equipped with a gas adjustment device consisting of a blower that circulates the combustion gas from the furnace, and after the chamber reaches a specified atmosphere, it gradually regenerates the adsorbent in the adsorber. Since the adsorbent in the adsorbent can be regenerated over a long period of time when the amount of gas generated is low, it prevents failure of the gas adjustment device due to deterioration of the adsorbent, and also has the effect of lengthening the period for replacing the adsorbent. can get.

[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, 9 ... Gas adjustment device, 15 ... Air blower, 16 ... Combustion furnace, 24.26 ... Adsorption device, 36, 37・
...adsorbent. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Diagram view C7'b-)

Claims (1)

[Claims] A storage for storing perishables, a cooling device for cooling the inside of the storage, a combustion furnace for burning fuel containing carbon to introduce carbon dioxide into the storage, and a combustion furnace for burning the fuel. a carbon dioxide gas generator comprising a blower that circulates air from the storage; a plurality of adsorbers that adjust the atmosphere in the storage to a predetermined value; and a combustion gas from the combustion furnace that circulates through the adsorbers. What is claimed is: 1. A fresh produce storage device comprising a gas regulating device consisting of an air blower and a gas regulating device, which gradually regenerates the adsorbent in the adsorber after the inside of the storage reaches a predetermined atmosphere.