JPS63126424A - Apparatus for storing perishables - 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 CA storage, which changes the air composition within the storage, as a longer-term storage means. In other words, by reducing the oxygen 02 concentration and increasing the carbon dioxide concentration in the storage, it is possible to suppress the respiration of fresh produce and also to prevent chemical reactions such as alteration9 decomposition and oxidation caused by microorganisms. It has been known. And this C
As shown in Japanese Patent Publication No. 80-12004, the A storage method reduces the oxygen concentration in the storage by burning fuel containing carbon in a combustion device and introducing the combustion exhaust gas into the storage. It consists of a gas generator and a Co2 absorption tower (gas adjustment device) that adjusts the atmosphere inside the refrigerator to a predetermined value.

On the other hand, in such perishables storage equipment (CA storage equipment@), the perishables can be stored for a long time by using a cooling device to circulate cold air inside the storage and by controlling the atmosphere. 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.

Problems to be Solved by the Invention In the above-mentioned fresh food storage apparatus, when adjusting the atmosphere inside the chamber, for example, when the CO2 concentration reaches a predetermined value at 5%, and when reducing the CO2 concentration from 9.02 to 6. , the air inside the warehouse is sent to the combustion furnace, where the 02 in the air is changed into Co2, and this combustion gas is introduced into one of the two carbon dioxide adsorbers of the gas adjustment device, and activated carbon etc. The adsorbent adsorbs CO2 in the combustion gas and returns this air to the inside of the chamber. On the other hand, a blower sends indoor air to remove CO2 adsorbed on the adsorbent. For example, adsorption 6 external desorption is used to regenerate the adsorbent. The sessions were held at different times, such as 6 minutes.

However, when regenerating the adsorbent by blowing air, the inflow 2. There was a problem in that the rate of decrease in the 02 concentration in the storage was slow.

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

Means to solve problems Therefore, the present invention relates to a storage for storing perishables.

A cooling device that cools the inside of the storage, a combustion furnace that burns fuel containing carbon to introduce carbon dioxide gas into the storage, and a blower that circulates air from the storage to be used for combustion of the fuel in the combustion furnace. a gas regulating device consisting of a plurality of adsorbers that adjust the atmosphere in the storage to a predetermined value, a blower device that regenerates the adsorbers, and a carbon dioxide gas generator in the storage. It consists of a control device that switches adsorbers depending on the concentration.

Effects According to the present invention, with the above-described configuration, the switching of adsorbers can be controlled, so that the amount of inflow into the storage can be reduced by %02, so that the inside of the storage can be quickly adjusted to a predetermined atmosphere.

EXAMPLE Hereinafter, an example of the present invention will be described based on one drawing.

In the figure, 1 is a storage unit such as a prefabricated refrigerator for storing perishables, and a cooling device 7 consisting of a compressor 2, a condenser 3, a No. 1 evaporator 4, and a blower 5 and 6 is mounted on the top. The air blower 5 cools the condenser 3, and the air blower 6 forcibly circulates cold air from the evaporator 4 into the warehouse.

The storage 1 has a carbon dioxide gas generating device 8 for introducing carbon dioxide gas C02 into the storage. A gas regulating device 9 that maintains the atmosphere inside the refrigerator in a constant state is connected to each of them. The carbon dioxide gas generator 8 introduces combustion gas or, in a steady state, gas from the storage 1 by opening and closing an inlet pipe 1Q that introduces air from the storage 1 and valves 11 and 12, and a gas regulator 9.
A valve 14. It is composed of an air blower 16 (for example, a sirocco fan) and a combustion furnace 1e.

The blower device 15 sends the air inside the warehouse 1 to the combustion furnace 16 through the introduction pipe 10, and blows the air into the combustion furnace 16 by opening and closing the valves 11 and 12.
The combustion gas in the storage room 1 and the gas in the storage 1 are introduced into the gas adjustment device 9. The combustion furnace 16 also includes a casing 18 equipped with a ceramic tube 1a on the inner surface, and a
The fuel tank 8 is comprised of a lid and cover 20 on which the solid fuel 19 is placed, and an ignition heater 21 for heating the air from the blower 16 and combusting 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.

The combustion gas is N2 and C due to the reaction of C+O2→CQ2.
It becomes O2.

22, when the o2!1 degree from the introduction pipe 10 is extremely low,
A valve 23 is a heat exchanger for cooling the exhaust pipe B, and a valve 23 is for introducing outside air to continue combustion of the solid fuel 19.

On the other hand, the gas adjustment device 9 includes two adsorbers 24 and 26,
It is composed of an inlet pipe 26 that sends combustion gas to the gas adjustment device 9, an exhaust pipe 27 that sends it into the warehouse 1, a blower 28, a blower 29 for regenerating the adsorber 24, 25, and no(lubes 3o to 37). The adsorber 24.25 has an adsorbent 38. made of activated carbon.
39 is filled. 4o is a valve 3 that is activated by a signal from a CO2 concentration meter 41 that measures the CO2 concentration in the storage chamber 1.
A control device 42 controls the blower 29 using the same signal.

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
°C) When fruits and vegetables are stored in storage 1.

The atmosphere inside storage 1 is outside air (N2 = 79%).

02=21%), which is point A in Figure 2. Here C
A atmosphere (for example, N2 = 90%, CC2 = s%.

o2=5%) The carbon dioxide gas generator 8 is activated in order to make the point 0 in FIG. Then, the air inside the storage 1 is transferred to the inlet pipe 10.
Valve 14. The air is introduced into the combustion furnace 16 via the blower 16 and subjected to combustion. The combustion gases resulting from the combustion of the solid fuel 19, that is, the gases of N2 and Co2, first pass through the adsorber 24,
C2 is introduced into the storage 1 through the discharge pipe 27, and C2 gradually decreases. At this time.

Since the combustion gas is passing through the adsorption tower 24, the
0,33.36.36 are in open state, valve 31
．． 32, 34, and 37 are in a closed state. At this time, the regeneration blower 29 of the adsorber 24, 25 is still stopped.

Also, since the combustion gas passes through the adsorber 24, the combustion gas contains CO2, No, So! etc., adsorbent 38
However, since the concentration of CC2 is high, the adsorption limit for Co2 is reached after a while, and CO2 begins to leak from the adsorber 24, and the Co2 concentration in the storage 1 increases.

After the Co2 generated in the combustion furnace 1e is adsorbed by the adsorbent 38 according to its adsorption capacity, the Co2 flows into the warehouse.
For example, the atmosphere inside the refrigerator is ('2 = 80%.

When reaching point B in Figure 2 (Q = 16%, CO2 = 6%), the CO2 concentration meter 41 detects the CO2 concentration in the storage 1,
CA atmosphere (N2=90%, O2=5%, CC2=s%
) to control the blower control device 42. Valve control device 4
o, the blower 29 operates to remove the CO2 adsorbed on the adsorbent 38, and also removes the C02 generated in the combustion furnace 1e.
In order to adsorb o2, the valves 30 to 3 are operated, and the combustion gas changes from passing through the adsorber 24 to passing through the adsorber 25.

At this time, the blower 29 causes the inside of the storage 1 to have a CA atmosphere (N2=
90%, 02=6%, CC2=ts%) Figure 2 C
Operation is performed to reach point K, and the adsorbent 38.39 in the adsorber 24.25 is
Desorption of CO2 adsorbed on the air is performed alternately. Also valve 3
The opening/closing of 0 to 37 is performed by CO2!1 degrees in the storage 1. In other words, the combustion gas first passes through the adsorber 24 until the CO2 concentration in the storage 1 reaches 6 degrees, and when it reaches 6 degrees or more, the valve controller 40 controls the valves 31, 32, 34.
, 37 are open, and 30, 33° and 35.36 are closed, and the combustion gas passes through the adsorber 26 and is sent to the adsorber 24 by the blower 29.
is played.

In this state, the CO2 in the storage 1 will be adsorbed by the adsorber 25 together with the CO2 generated by combustion, and the CO2 concentration in the storage 1 will decrease. However, when the adsorber 26 adsorbs CC2 to a certain extent, the adsorption limit for Co2 is reached and CO2 begins to leak, so that the CO□ concentration in the storage 1 gradually increases. When the CO2 concentration in the storage 1 becomes 5% or more, the valve control device 40 opens the valves 30, 33, 35, and 36, and closes the valves 31, 32, 34, and 37, and the combustion gas flows into the adsorber 24. As usual, the adsorber 25 is regenerated by the blower 29.

In other words, as mentioned above, the inside of the storage is CA atmosphere (N2=
90%, O2 = 6%, CO2 = 6%) The adsorption 24.25 is switched depending on the CO2 concentration in the 1st floor storage room 1, and the one through which combustion gas is not passing is always CO2 by the regeneration blower 29. will be attached and detached.

Here, during regeneration by air blowing from the adsorbers 24 and 25, 02 is adsorbed to the adsorbents 3B and 39, and the carbon in the combustion gas is
During o2 adsorption, C2 adsorbed on the adsorbent 38.39 is desorbed and flows into the storage 1, but since the adsorbent 38.39 adsorbs Co2 up to its adsorption limit, the adsorbent 24.2'5
For example, the switching time for the adsorbent is 38.39 to 30.
If the absorber 2 is used, it will take about 20 minutes, so
The amount of 02 flowing into the warehouse due to the switching of 4.25 is significantly reduced compared to the case where the switching time is set to 5 minutes by a timer, considering the long-term reliability of the adsorbent 38.39.

In other words, depending on the Co2 concentration in the storage 1, the valves 30 to 3
When opening and closing 7, the opening and closing time is determined according to the CO2 adsorption capacity of the adsorbents 38 and 39, so the adsorbent 3
Compared to determining the switching time of the adsorbers 24 and 25 by considering the long-term reliability of 5.39, the switching time can be longer, and the amount of O2 flowing into the storage 1 due to the adsorption of Co is determined by the valves 3o to 3o. Since the amount of CQ2 flowing into the storage 1 due to CQ2 adsorption in the combustion gas decreases, the amount of CQ2 flowing into the storage 1 decreases.
The interior can be quickly adjusted to the desired atmosphere.

Effects of the Invention 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 gas into the storage, and a combustion furnace for injecting the fuel into the storage. A carbon dioxide gas generator comprising a blower that circulates air for combustion from the storage, a plurality of adsorbers that adjust the atmosphere in the storage to a predetermined value, and a blower that regenerates the adsorbers. This is a fresh produce storage device consisting of a gas adjustment device consisting of a gas regulator, and a control device that switches the adsorber according to the carbon dioxide concentration in the storage.
Since the adsorber switching time is determined by the carbon dioxide adsorption capacity of the adsorber, the switching time is longer than if the switching time was determined by considering the long-term reliability of the adsorbent in the adsorber from the beginning. The amount of oxygen flowing into the storage during absorption and adsorption of carbon dioxide tends to be very high immediately after switching the adsorber, and then gradually decreases. The effect is that the atmosphere can be quickly adjusted to a predetermined atmosphere.

[Brief explanation of the drawing]

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 generator %9...Gas regulator 215...Blower, 1e...Combustion furnace, 24.25...Adsorption Vessel, 29...
・Blower device, 40... Control device for switching the adsorption device. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
FLa, '1 7- Rei Immediate Discipline! 8- Carbon dioxide generator 9- Gas tone! E device 15- Breathing training I /6-j! ! ,+1A 24.25-Adsorber 6-Transfer IL substitution station-Adsorption 5 HiW arm λru Cape Ft location Fig. 1

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 gas conditioning device comprising a carbon dioxide gas generation device comprising a blower device that circulates air from the storage, a plurality of adsorbers that adjust the atmosphere in the storage to a predetermined value, and a blower device that regenerates the adsorbers. A fresh produce storage device comprising: a device; and a control device that switches adsorbers depending on the carbon dioxide concentration in the storage.