JPS63129925A - 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, 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 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.

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. 1' is a storage, and a cooling device 4 consisting of an evaporator 2' and a condensing unit 3' is installed therein. This is a 6-hypropane gas cylinder, and the carbon dioxide gas generator 6' provides the air introduced from the storage unit 1' to the introduction tube 1-c and burns it to produce C3H8+602→3Co2+4H20+531.
Combustion exhaust gas generated by kcal reaction.

That is, carbon dioxide (CO2) is discharged from the storage 1 through a discharge pipe 8'. 9' is a carbon dioxide adsorption device.

It is introduced from the storage 1' through the inlet pipe 10', and after adsorbing excess carbon dioxide gas (CO2), it is introduced into the storage 1 through the discharge pipe 11'.
’. 12' is a gas monitor and storage 1
By detecting the gas concentration within ', the carbon dioxide gas generator 6' and the carbon dioxide adsorption device 9' are controlled in a timely manner.

When storage is finished and the perishables in storage 1' are taken out, the door (not shown) of storage 1' is opened and the top of storage 1' is opened to return the oxygen-deficient gas in storage 1' to the atmosphere. Ventilation is provided by a ventilation fan 13' provided at.

Problems to be Solved by the Invention However, with the above configuration, it is necessary to open the door of the storage to let in fresh air from the outside to ventilate the gas inside the storage, and the inside of the storage is Despite the lack of oxygen, there was a high risk that a person could enter the vault.

In view of the above-mentioned problems, the present invention provides a perishables storage device that can ventilate the gas inside the storage while keeping the door of the storage closed.

Means for Solving the Problems In order to solve the above problems, a perishables storage device (l) of the present invention is provided.
'lj, a desorption blower that regenerates the adsorbent that has adsorbed carbon dioxide, an exhaust pipe that communicates with the outside air via a switching valve that switches the flow path downstream of the circulation blower, and a flow path downstream of the desorption blower. It is equipped with an exhaust pipe that communicates with the storage via a switching valve.

According to the above configuration, when the gas in the storage is ventilated, the present invention allows the circulation blower to connect the gas in the storage to the outside air by switching the switching valve from the exhaust pipe provided downstream of the circulation blower. At the same time, fresh outside air is introduced into the storage by a desorption blower through an exhaust pipe connected to the storage via a switching valve installed downstream of the desorption blower. The gas inside the storage can be replaced with atmospheric air without opening the storage door, and the risk of people entering the storage in an oxygen-deficient state can be eliminated.

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, numeral 1 is a storage such as a Brefab 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 storage 1 includes a carbon dioxide gas generator 8 for filling the interior with carbon dioxide (CO2), and a carbon dioxide adsorption device 9 for adsorbing and removing excess carbon dioxide (CO2) from combustion gas. It is connected. The carbon dioxide gas generator 8 is configured 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. 14 is a circulation blower, and cooler 1
3 and the carbon dioxide adsorption device 9, the air inside the storage 1 is guided to the combustion furnace 12 through the introduction pipe 1o, and the combustion gas generated in the combustion furnace 12 is further cooled by the cooler 13. , is led to the 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, and an inner casing 1 for supplying combustion secondary air.
6 and the outer casing 18 forming an air path 1γ between the outer casing 18 and the @
It consists of a grate 20 on which the solid fuel 19 is placed within the heat tube 16, and an ignition heater 21 for heating the combustion air to combust the solid fuel 19. The solid fuel 19 is highly pure carbon, and when it is combusted, a reaction of C+020N2<020N2 results in the combustion gas being carbon dioxide (C02) and nitrogen (N2).
2) becomes.

On the other hand, the carbon dioxide adsorption device 9 is for adsorbing excess carbon dioxide (CO2) in the combustion gas and discharging it outside 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. In the adsorber 22 r 2 S.

Filled with adsorbents 30 and 31, carbon dioxide gas (Co2
), and when the adsorption capacity drops, the blower 32 transfers outside air to the switching valve 33. The adsorber 22 or 23 is passed through the inlet pipe 34.35 which is connected to the discharge pipe 26.27.
Air is blown to desorb carbon dioxide gas, and the inlet pipe 24 or 26
The discharge pipes 36, 37. It is configured to be exhausted to the atmosphere from an exhaust pipe 39 through a switching valve 38.

For example, when the adsorber 22 is acting as an adsorbent and the adsorber 23 is acting as a desorber, the switching valves 28 and 29 are set so that the combustion gas is transferred to the inlet pipe 24. It is open in the direction of flow passing through the adsorber 22 and the discharge pipe 2e. f, ta.

The switching valves 33 and 38 allow outside air to be supplied to the inlet pipe 36 by the desorption blower 32. It passes through the adsorber 23 and the discharge pipe 37, opens in the flow direction, and is exhausted to the atmosphere through the exhaust pipe 39. The exhaust pipe 4o connects the switching valve 29 and the storage. 41, 42 are switching valves for the storage 1 and the combustion furnace 12, respectively. Provided between the cooler 13 and the blower 14,
and.

The switching valves 41, 42 are connected 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. 46 is a chamber, which 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 46.

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

Initially, the atmosphere inside storage 1 was N2=79, 0□=21
%, and when the carbon dioxide generator 8 is operated, the air inside the refrigerator is passed through the introduction pipe 10 by the circulation blower 14 to the chamber 46. Through the reaction through the switching valve 41, the combustion gas becomes carbon dioxide (CO2) and nitrogen N2, and the cooling finger 13
After cooling in the connecting pipe 11, the switching valve 42. It passes through the circulation blower 14 and further passes through the switching valve 28. It passes through the introduction pipe 24 and enters the adsorber 22. Here, carbon dioxide gas (
CO2) is adsorbed by the adsorbent 30 and becomes nitrogen (N2).
Only the gas passes through the exhaust pipe 26 and the switching valve 29 and is circulated to the storage 1 via the exhaust pipe 40. After a certain period of time has elapsed, the switching valves 28 and 29 are switched so that the adsorber through which the combustion gas circulates is switched from 22 to 23. It passes through the introduction pipe 25 and enters the adsorber 23. Here again, carbon dioxide gas (CO2).

Only nitrogen (N2) adsorbed by the adsorbent 31 passes through the exhaust pipe 27% switching valve 29 and circulates to the storage 1 through the exhaust pipe 40. After a certain period of time has passed again, the adsorber 22
．． 23 is switched, and the combustion gas is circulated alternately. During this time, the adsorbent 30.31 filled in the adsorber 22.23
reaches the limit of carbon dioxide (Co□) adsorption capacity, and carbon dioxide (Co2) in the combustion gas can no longer be adsorbed.
The gas is exhausted into the storage 1 through the exhaust pipe 40, and the carbon dioxide (Co2) concentration within the storage 1 begins to gradually increase.

It has been about 2 hours since the start of operation in the storage 1, which has a size of 6rrL.During this period, the oxygen (02) concentration in the storage 1 continues to decrease from the initial 21 cm.The gas concentration in the storage 1 is Oxygen (o2) = 5%, carbon dioxide gas (Co2) = 5%
, if nitrogen (N2) = 90% is a predetermined value, storage 1
When the gas monitor 46 detects by sampling the gas in the chamber 46 that the amount of carbon dioxide gas in the chamber has increased and reached the level 6, the desorption blower 32 of the carbon dioxide adsorption device 9 is operated and the adsorption The regeneration of the adsorbent inside the vessel has started. For example, when the adsorber 22 is adsorbing carbon dioxide (Co2) as combustion gas circulates, the adsorber 23 is
The outside air is switched by the blower 32 to the switching valve 33 and the inlet pipe 3.
6. Carbon dioxide (Co2) is desorbed and regenerated by passing through the exhaust 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 6%. On the other hand, the oxygen (O2) concentration is.

During that time, it continues to decrease as it is being used for combustion, and 10
After a period of time, the predetermined value of 6 yen is reached, the gas monitor 46 detects this, and the carbon dioxide gas generator 8 and carbon dioxide adsorption device 9 are stopped. Now, the inside of the storage 1 has the predetermined gas concentration, oxygen (0°) = s%, carbon dioxide (Co2) = s%, nitrogen (
N2) = 90%, and storage begins. oxygen (02)
At the same time as detecting that the concentration has reached the predetermined 5%, the switching valves 41 and 42 switch the inlet pipe 10, the connecting pipe 43, and the connecting pipe 1.
Switches so that 1 is connected. Thereafter, by operating the circulation blower 14 at regular intervals and detecting the gas in the chamber 46 with the gas monitor 45, carbon dioxide (CO2) generated by the respiration of the fresh food stored in the storage 1 is detected. exceeds a predetermined threshold, the carbon dioxide adsorption device 9
acts and adsorbs carbon dioxide (C02) until it reaches a predetermined concentration. To explain this operation, when the gas monitor 46 detects that a predetermined concentration has been exceeded, the circulation blower 14
is operated, and the gas in the storage 1 is transferred to the inlet pipe 10% switching valve 41, the connecting pipe 43, the switching valve 42. Circulation blower 1
4. Connecting pipe 11% switching valve 28. Excess carbon dioxide gas (C02) is introduced into the adsorber 22 through the inlet pipe 24, and is adsorbed by the adsorbent 3o. It passes through the switching valve 29 and the exhaust pipe 40 and circulates to the storage 1. On the other hand, the adsorber 23 receives outside air from the switching valve 3 by the blower 32.
3. Carbon dioxide (Co2) is desorbed and regenerated by passing through the introduction pipe 36 and the exhaust 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- returns to the predetermined concentration.

In addition, oxygen (0
2) becomes a predetermined value of 6% or less, outside air is introduced into the storage 1 by the desorption blower 32 and replenished. The introduction route is the desorption blower 32. Switching valve 33, introduction pipe 35, exhaust pipe 27. It passes through the switching valve 29 and the exhaust pipe 4o, and is introduced into the 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)
By turning on the circulation blower 14, the gas in the storage chamber 1 is transferred to the inlet pipe 10% switching valve 41, the connecting pipe 43, the switching valve 42, the connecting pipe 11, the switching valve 28, the inlet pipe 25. It passes through the exhaust pipe 37, the switching valve 38, and the exhaust pipe 39 and is released into the atmosphere. At the same time, outside air is introduced into the storage 1 by the desorption blower 32. The route is: feed 1ti1[32 for removal/detachment, switching valve 33, introduction pipe 34.
These are a discharge pipe 26, a switching valve 29, and an exhaust pipe 40. Chamber 4 indicates that the gas in storage 1 has become equal to the outside air.
6 is detected by the gas monitor 45, the circulation blower 14 and the desorption blower 32 are stopped, and the switching valve 28 is communicated with the introduction pipe 24, and the switching valve 33 is communicated with the introduction pipe 34. Switch to.

As described above, when ventilating the gas in the storage 1, the circulation blower 14 directs the gas in the storage 1 to the switching valve 28 through the exhaust pipe 39 provided downstream of the circulation blower 14.
．． 38 and communicated with the outside air, releasing it into the atmosphere at the same time.

By introducing fresh air into the storage 1 by the desorption blower 32 through the exhaust pipe 4o that communicates with the storage 1 via the switching valve 33.29 provided downstream of the desorption blower 32, the door of the storage 1 is closed. The gas in the storage chamber 1 can be replaced with atmospheric air without opening the tank (not shown),
It is possible to eliminate the danger of entering a storage room that is deficient in oxygen.

Effects of the Invention As described above, the present invention provides a desorption blower that regenerates an adsorbent that has adsorbed carbon dioxide, and an exhaust pipe that communicates with outside air via a switching valve that switches a flow path downstream of the circulation blower. By providing an exhaust pipe connected to the storage via a switching valve that switches the flow path downstream of the desorption blower, gas in the storage can be replaced with atmospheric air without opening the storage door. It is possible to eliminate the risk of entering a storage room that is deficient in oxygen.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a fresh food storage device according to an embodiment of the present invention, and FIG. 2 is a diagram of changes in internal gas components due to the same device.
FIG. 3 is a system diagram of a conventional fresh food storage device. 1...Storage, 12...Combustion furnace, 14
...Circulation sleeper, 19...Solid fuel, 22,23...Adsorber, 32...Blower for desorption, 39.40... ...exhaust pipe, 41,4
2...Switching (lube%46...chamber. Name of agent: Patent attorney Toshi Nakao, male, and one other person W&
Figure 2 (/,)

Claims (1)

[Claims] a storage for storing perishables; a combustion furnace for burning carbon-containing fuel to introduce carbon dioxide gas into the storage;
A circulation blower that circulates the air used for combustion of the fuel in the combustion furnace through the storage, an absorber containing an adsorbent to adsorb excess carbon dioxide gas generated from the combustion furnace, and a A desorption blower that regenerates the adsorbent that has adsorbed gas; an exhaust pipe that communicates with outside air via a switching valve that switches the flow path downstream of the circulation blower; and a flow path that is switched downstream of the desorption blower. A fresh produce storage device comprising: an exhaust pipe communicating with the storage via a switching valve.