JPS63126426A - perishable storage equipment - 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, a longer term storage method involves changing the air composition within the storage room. It reduces the concentration of oxygen (O2) in the storage room and releases carbon dioxide (C02).
) 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.

An example of the above-mentioned conventional fresh food storage device will be described below with reference to the drawings.

FIG. 3 shows a system diagram of a conventional fresh food storage device. Reference numeral 1' denotes a storage, which is provided with a cooling lid 4' consisting of an evaporator 2' and a condensing unit 3'. 6′
is a propane gas cylinder, which is combusted by the carbon gas generator 6' using the air introduced from the storage 1' through the inlet pipe 7' to produce C3H8+60-3CO2+ 4H20+ 6
The combustion exhaust gas, that is, carbon dioxide gas (
CO2) is discharged to the storage 1' through a discharge pipe 8'. Reference numeral 9' denotes a carbon dioxide adsorption device, which is introduced from the storage 1' through an inlet pipe 10', adsorbs excess carbon dioxide (Co2), and then returned to the storage 1' through a discharge pipe 11'. 12'
is a gas monitor which detects the gas concentration in the storage chamber 1' and controls the carbon dioxide gas generating lid 6' and the carbon dioxide adsorption device 9' in a timely manner.

Problems to be Solved by the Invention However, in the above configuration, carbon dioxide (Co) is a component of the gas generated from the carbon dioxide gas generator 6'.
In addition to 2), it contains large amounts of gases such as ethylene and propylene that are harmful to the storage of fruits and vegetables, and because these gases are directly released into the storage 1', they often have an adverse effect on the stored items.

In view of the above problems, the present invention provides a fresh food storage device that can remove all gases harmful to storage.

Means for Solving the Problems In order to solve the above problems, the perishables storage device of the present invention includes a combustion furnace downstream of the storage, a blower downstream of the combustion furnace, an adsorption device downstream of the blower, and a downstream of the adsorption device. A storage is disposed in the combustion chamber, and a switching valve is provided between the storage and the combustion furnace, and a switching valve is provided between the combustion furnace and the blower.

Function: According to the present invention, all the gases generated by combustion are discharged into the storage through the adsorber with the above-mentioned configuration. This adsorber is filled with an adsorbent that not only adsorbs excess carbon dioxide gas CO2, but also adsorbs ethylene, etc.
All gases harmful to storage can be removed.

EXAMPLE Hereinafter, a fresh food storage apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of a fresh produce storage device in an embodiment of the present invention.

In FIG. 1, 1 is a storage such as a prefabricated refrigerator for storing perishables, a compressor 2, a condenser 3, an evaporator 4,
A cooling device consisting of a blower 5.8 is mounted on the top. The storage 1 includes a carbon dioxide gas generator 8 for filling the interior with carbon dioxide (CO2), and a carbon dioxide adsorption device e for adsorbing and removing excess carbon dioxide (CO2) in the combustion gas. It is connected. The carbon dioxide gas generator 8 is disposed between an introduction pipe 1o that introduces air in the storage 1 and a connecting pipe 11 that leads the combustion gas generated here to the carbon dioxide adsorption device 9, and connects the combustion furnace 12 and the combustion gas. It is composed of a cooler 13. Reference numeral 14 denotes a blower, which is installed in the connecting pipe 11 between the cooler 13 and the carbon dioxide adsorption device 9, guides the air in the storage 1 through the introduction pipe 10 to the combustion furnace 12, and further connects the combustion furnace 1 to the combustion furnace 1.
After the combustion gas generated in step 2 is cooled by a cooler 13, it is led to a carbon dioxide adsorption device 9 through a connecting pipe 11. The combustion furnace 12 includes an inner casing 16 having a heat insulating pipe 16 on its inner surface, an outer casing 18 forming an air passage 17 between the inner casing 1e and the inner casing 1e for supplying secondary combustion air, and a heat insulating pipe 15 inside the outer casing 18. A grate 2° on which solid fuel 19 is placed, and an ignition heater 21 for heating combustion air to combust solid fuel 19.
It is composed of

The solid fuel 19 is highly pure carbon and is combustible.
The combustion gas becomes carbon dioxide (Co2) and nitrogen (N2) through the reaction of 020N2-CO2+N2.

On the other hand, the carbon dioxide adsorption device 9 is for adsorbing excess carbon dioxide (Co2) in the combustion gas and discharging it to the outside of the storage 1. Inlet pipes 24, 25 and exhaust pipes 26 are connected to the two adsorbers 22, 23 so that the combustion gas alternately circulates.
．． 27, and switching valves 28 and 29 for switching the flow. Inside the adsorber 22.23, there is an adsorbent 30.3.
1 is filled with carbon dioxide (CO2), and when the adsorption capacity decreases, the blower 32 switches the outside air to the switching valve 33. Air is blown to the adsorber 22 or 23 through the inlet pipe 34 or 35 connected to the discharge pipe 26, 27,
Desorb the carbon dioxide gas, connect it to the inlet pipe 24 or 25 and keep it at ℃
The exhaust pipe 39 is configured to be exhausted to the atmosphere through the exhaust pipes 36, 37 and the switching valve 38.

For example, when the adsorber 22 is performing adsorption and the adsorber 23 is performing desorption, the switching valves 28 and 29 are set in the direction in which the combustion gas flows through the combustion gas inlet pipe 24, adsorber 22, and discharge pipe 26. The switching valves 33 and 38 are opened in the direction in which outside air flows through the inlet pipe 36, adsorber 23, and exhaust pipe 37 by the blower 32, and is exhausted to the atmosphere through the exhaust pipe 39. Ru. The exhaust pipe 4o connects the switching valve 29 and the storage. 41 and 42 are switching valves for the storage 1, the combustion furnace 12, the cooler 13 and the blower 14, respectively.
The switching valves 41 and 42 are connected to each other by a connecting pipe 43. 44 is a controller that controls the air volume of the blower 14, and the air volume is determined by a signal from a gas monitor 45 that detects the gas concentration in the storage 1. A chamber 46 is a container provided in the introduction pipe 1o between the storage 1 and the switching valve 41, and is connected to the sampling tube 47 of the gas monitor 45.

Regarding the fresh food storage device configured as described above, the first
The operation will be explained using FIG.

The atmosphere in storage 1 was initially N 27 s % p 0
When the carbon dioxide gas generator 8 is operated at 22'%,
Internal air is introduced into the combustion furnace 12 by the blower 14 from the introduction pipe 1o through the chamber 46 and the switching valve 41, heated by the ignition heater 21, and used for combustion of the solid fuel 19. C+020N2 (o2 擢.

In the reaction, the combustion gas is carbon dioxide (C02) and nitrogen (N2)
After being cooled by the cooler 13, the air passes through the switching valve 42 and the blower 14 through the connecting pipe 11, and further passes through the switching valve 28 and the introduction pipe 24, and enters the adsorber 22. Here, carbon dioxide (Co2) is adsorbed by the adsorbent 3o, and only nitrogen (N2) passes through the exhaust pipe 26 and the switching valve 29 and circulates to the storage 1 through the exhaust pipe 4o. After a certain period of time has elapsed, the switching valves 28 and 29 are switched so that the adsorber in which the combustion gas circulates is switched from 22 to 23, and the combustion gas passes through the switching valve 28 and the introduction pipe 25 and enters the adsorber 23. Here, carbon dioxide (C02) is again adsorbed by the adsorbent 31, and only nitrogen (N2) passes through the exhaust pipe 27 and the switching valve 29, and is circulated to the storage 1 through the exhaust pipe 4o. After a certain period of time has elapsed again, the adsorbers 22 and 23 are switched, and the combustion gas is alternately circulated. During this time, the adsorber 23
．． The adsorbents 30 and 31 filled in the chamber 23 reach the limit of their adsorption capacity for carbon dioxide (CO2), and the carbon dioxide (CO2) in the combustion gas cannot be adsorbed completely, and it passes through the exhaust pipe 40 to the storage chamber. 1, and carbon dioxide gas (
Co2) concentration begins to increase gradually. This is the state of the storage 1, which has a size of 76rr+3, and has been in operation for about 2 hours since the start of operation. During this time, the oxygen (O2) concentration in storage 1 was initially 21%.
continues to decrease. The gas concentration in storage 1 is set to oxygen (0
2) 6%, carbon dioxide gas (C02) 5%.

Assuming that 90% nitrogen (N2) is the predetermined value, when the gas monitor 46 detects by sampling the gas in the chamber 4θ that the carbon dioxide gas in the storage chamber 1 has increased to 6. The blower 32 for desorption of the gas adsorption device 9 is operated, and regeneration of the adsorbent in the adsorption device is started. For example, when the adsorber 22 is adsorbing carbon dioxide (CO2) as combustion gas circulates, the adsorber 23 is moved to the outside air by the blower 32 through the switching valve 33. Carbon dioxide (C02) is desorbed and regenerated by passing through the inlet pipe 35 and the discharge pipe 27 and being blown onto the adsorbent 31. Since this is performed alternately at regular intervals, the carbon dioxide (CO2) concentration in the storage 1 is maintained at a predetermined 5%. On the other hand, oxygen (
02) The concentration continues to decrease as it is being used for combustion during that time, and reaches the predetermined 6% after 10 hours, which is detected by the gas monitor 46, and the carbon dioxide gas generator 8 and carbon dioxide adsorption device 9 0 Now, the inside of storage 1 is at the predetermined concentrations of oxygen (02) 5% and carbon dioxide fj (CO2).
) 5%, nitrogen (N2) 90%, and storage begins. At the same time as detecting that the oxygen (0□) concentration has reached a predetermined value of 5%, the switching valves 41 and 42 are switched so that the introduction pipe 10, the connecting pipe 43, and the connecting pipe 11 are communicated with each other.

After that, the blower 14 is operated at regular intervals, and the chamber 4 is
By detecting the gas in the storage compartment 1 with the gas monitor 46, if the carbon dioxide (Co□) generated by the respiration of fresh food stored in the storage compartment 1 exceeds a predetermined 6%, the carbon dioxide adsorption device 9 is activated. It works to adsorb carbon dioxide (CO2) until it reaches a predetermined concentration. To explain this operation, when the gas monitor 45 detects that a predetermined concentration has been exceeded,
The blower 14 is operated, and the gas in the storage 1 is transferred to the inlet pipe 10.
．． Excess carbon dioxide (Co2
) is adsorbed by the adsorbent 30 and further circulates to the storage 1 through the exhaust pipe 26, the switching valve 29, and the exhaust pipe 4o. On the other hand, in the adsorber 23, outside air is passed through the switching valve 33, the inlet pipe 36, and the exhaust pipe 27 by the blower 32, and the adsorbent 3
1, carbon dioxide gas (C02) is desorbed and regenerated. Since this is applied alternately at regular intervals, the carbon dioxide (Co2) concentration in the storage 1 returns to the predetermined concentration.

In addition, oxygen (0
2) becomes less than a predetermined 6%, outside air is introduced into the storage 1 by the blower 32 and replenished.

The introduction route includes a blower 32, a switching valve 33, and an introduction pipe 35.
, passes through the exhaust pipe 27, the switching valve 29, and the exhaust pipe 4°,
It is introduced into storage 1.

Next, the operation of ventilating the gas in the storage 1 in order to finish storage and take out the perishables in the storage 1 will be explained.

Ventilation switch (not shown) on control panel (not shown)
The blower 14 is operated by turning on the gas in the storage 1 through the inlet pipe 10, the switching valve 41, and the connecting pipe 4.
3. It passes through the switching valve 42, the connecting pipe 11, the switching valve 28, the introduction pipe 25, and the discharge pipe 37, and is released into the atmosphere. At the same time, outside air is introduced into the storage 1 by the blower 32. The paths include the blower 32, the switching valve 33, the inlet pipe 34, the discharge pipe 26, the switching valve 29, and the exhaust pipe 40. Gas monitor 4 confirms that the gas in storage 1 has become equal to the outside air.
6, the blowers 14 and 32 are stopped, and the switching valve 33 is opened so that the switching valve 28 is communicated with the introduction pipe 24.
is switched so that it communicates with the introduction pipe 34.

As described above, the present invention provides a combustion furnace downstream of a storage, a blower downstream of the combustion furnace, an adsorption device downstream of the blower, a storage storage downstream of the adsorption device, and a storage storage and a combustion furnace. and a switching valve installed between.

Since the combustion furnace is connected to a switching valve installed between the blower, all the gas generated by combustion is released into the storage through the adsorber, which removes excess carbon dioxide. Because it is filled with an adsorbent that not only adsorbs CO2 but also adsorbs ethylene, etc., it can remove all gases that are harmful to storage.

Effects of the Invention As described above, the present invention provides a combustion furnace downstream of a storage, a blower downstream of the combustion furnace, an adsorption device downstream of the blower, a storage storage downstream of the adsorption device, and a storage storage. The switching valve installed between the combustion furnace and the combustion furnace is connected to the switching valve installed between the combustion furnace and the blower, so all the gas generated by combustion is released into the storage through the adsorber. Therefore, this adsorber not only adsorbs excess carbon dioxide gas (C02), but also contains an adsorbent that adsorbs ethylene and other substances, making it possible to remove all gases that are harmful to storage.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a fresh food storage device according to an embodiment of the present invention, FIG. 2 is a diagram of changes in gas components in the refrigerator according to the same device, and FIG. 3 is a system diagram of a conventional fresh food storage device. 1...Storage, 12...Combustion furnace, 14
・River...Blower, 19...Solid fuel, 22.2
3...Adsorber, 41.42...Switching valve.

Claims (1)

[Claims] a storage for storing perishables; a combustion furnace for burning carbon-containing fuel to introduce carbon dioxide gas into the storage;
This combustion furnace is equipped with a blower that circulates air from the storage to be used for combustion of the fuel, and an absorber containing an adsorbent to adsorb excess carbon dioxide gas generated from the combustion furnace, The combustion furnace is arranged downstream, the blower is arranged downstream of the combustion furnace, the adsorber is arranged downstream of the blower, and the storage is arranged downstream of the adsorber, and
a switching valve provided between the storage and the combustion furnace;
A fresh produce storage device characterized in that a switching valve provided between the combustion furnace and the blower is connected.