JPH0348775B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention improves respiration and microorganisms by adjusting the air composition of the atmosphere in which fresh food is placed.
It is used in the field of fresh food storage as a storage device that suppresses the activity of oxygen and other substances.

Conventional technology Conventional storage devices are used, for example, in Kaoru Kato's ``About a new resource-based CA storage system'' (air conditioning and refrigeration).
As shown in 1974-7 P191), the structure was as shown in Figure 2.

That is, fuel supplied from a cylinder or the like is mixed with air 3 supplied from the refrigerator 2 by the circulation blower 1, and the mixture is combusted in the carbon dioxide generator 4 to generate carbon dioxide. Since the carbon dioxide generated by the carbon dioxide generator 4 is supplied to the refrigerator 2, oxygen in the refrigerator 2 is decreased and carbon dioxide is increased. When the carbon dioxide concentration reaches the set value, the scrubber 5 is operated to adsorb excess carbon dioxide. Next, when the oxygen concentration reaches the set value, the carbon dioxide generator 4 is stopped and the oxygen supply blower 6 is operated to maintain a constant air composition in the atmosphere in which the perishables are placed (hereinafter referred to as CA gas). It is used to store perishables in a manner that preserves them.

Problems to be Solved by the Invention In general, when trying to maintain the temperature inside a refrigerator at a set temperature, not only in fresh food storage devices but also in refrigerators, a certain degree of temperature adjustment range occurs. However, in devices such as fresh food storage devices where the refrigerator is extremely airtight, this temperature adjustment range causes a large increase or decrease in pressure within the refrigerator. Therefore, in fresh food storage equipment, the pressure inside the refrigerator is adjusted using a blizzard bag that absorbs changes in internal pressure, preventing CA gas from leaking out of the refrigerator and atmospheric air from entering the refrigerator. are doing.

However, due to the position of the circulation blower 1 installed in the circulation path, the air pressure of the circulation blower 1 causes the inside of the refrigerator to become positive or negative pressure, and the increase or decrease in pressure due to the temperature adjustment width inside the refrigerator is absorbed by the blizzer bag. This results in problems such as CA gas inside the refrigerator leaking out of the refrigerator and atmospheric air entering the refrigerator.

The present invention provides a fresh food storage device with a simple configuration that suppresses the increase and decrease of pressure inside the refrigerator and prevents CA gas inside the refrigerator from flowing out of the refrigerator and atmospheric air from entering the refrigerator.

Means for Solving the Problems Therefore, the present invention connects a refrigerator and a carbon dioxide generator, and installs a purification catalyst, an air preheater, a cooler, a circulating blower, and a scrubber in the order downstream of the carbon dioxide generator. A scrubber and a refrigerator are connected to each other.

Effect The effect of this technical means is as follows.

In a fresh produce storage system, the large pressure drop of the circulation blower is caused by the carbon dioxide generator that has an internal combustion furnace and the scrubber filled with activated carbon as an adsorbent. Therefore, by placing a circulation blower between the carbon dioxide generator and the scrubber, and connecting the scrubber and the refrigerator, and the carbon dioxide generator and the refrigerator, the negative pressure in the carbon dioxide generator and the positive pressure in the scrubber can be reduced. It will be balanced and the pressure inside the refrigerator will be zero.

As a result, the blizzer back can function adequately, suppressing the increase and decrease of pressure inside the refrigerator, and preventing CA gas from leaking out of the refrigerator and atmospheric air from entering the refrigerator. be.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, a fire grate 9 is provided to partition a combustion furnace 8 of a carbon dioxide generator 7, and a solid fuel 10 is supplied onto the grate 9. Further, an electric heater 11 is provided below the grate 9. At the time of startup, the electric heater 11 is energized, and when the solid fuel 10 is heated to a temperature sufficient for combustion, the circulation blower 12 is operated to supply combustion air to the combustion furnace 8. Since the solid fuel 10 is already sufficiently heated, combustion begins as soon as air comes into contact with the solid fuel 10. The amount of combustion at this time is the surface area of the solid fuel 10,
It is determined by the amount of oxygen supplied to the solid fuel 10.

High-temperature exhaust gas containing a large amount of carbon dioxide generated by the carbon dioxide generator 7 is purified by a purification catalyst 13 and supplied to an air preheater 14 . In this air preheater 14, the exhaust gas is heat exchanged with the combustion air, and after preheating the combustion air, the exhaust gas is heated in the cooler 15.
supplied to The exhaust gas cooled by the cooler 15 is supplied to the refrigerator 17 through the scrubber 16. Then, the air whose oxygen concentration has decreased due to this is supplied to the combustion furnace 8 again by the circulation blower 12. This cycle continues until the carbon dioxide concentration within the refrigerator 17 reaches the set value.

The scrubber 16 has, for example, a carbon dioxide adsorption layer filled with activated carbon or the like, a regenerator for desorbing the adsorbed carbon dioxide, and a bypass path. When it is detected by a signal from a gas sensor (not shown) provided in the refrigerator 17 that the carbon dioxide concentration in the refrigerator 17 has reached the set value, the scrubber 16 is operated to maintain the set value. Continues to adsorb excess carbon dioxide.
When it is detected by the signal from the gas sensor in the refrigerator 17 that the oxygen concentration in the refrigerator 17 has reached a set value, the carbon dioxide generator 7, circulation blower 12, and scrubber 16 are stopped. Thereafter, the oxygen consumed by the stored perishables when they breathe is supplied from the oxygen supply blower 18 to the refrigerator 17, and the carbon dioxide generated when the perishables breathe is removed by the scrubber 16. By adsorption, the air composition within the refrigerator 17 is maintained at the set value.

The specific operational relationship of the embodiment of the present invention having such a configuration will be described below.

When the temperature inside the refrigerator 17 rises by 1° C. from the set value, the pressure inside the refrigerator 17 increases by about 30 to 40 mmAg. Therefore, if the temperature adjustment width inside the refrigerator 17 is ±1°C, the pressure inside the refrigerator 17 will be ±30 to 40 mm while the temperature inside the refrigerator 17 changes.
It fluctuates at a fairly high value called Ag. In order to absorb this pressure fluctuation, the breather bag 19 provided in the refrigerator 17 in the fresh food storage apparatus constantly expands and contracts during refrigeration.

However, the circulation blower 1 installed in the circulation path
Due to the position 2, the inside of the refrigerator 17 becomes positive or negative pressure due to the air blowing pressure of the circulating air blower 12, making it difficult for the breather bag 19 to absorb the increase or decrease in pressure due to the temperature adjustment width inside the refrigerator 17. In particular, the more oxygen is deficient, the more the amount of circulating air increases, so the degree to which the inside of the refrigerator 17 becomes positive or negative pressure increases.

For example, a circulation blower 1 is placed immediately upstream of the refrigerator 17.
2, the inside of the refrigerator 17 becomes positive pressure and the breather bag 19 remains expanded. Therefore, the pressure increase when the temperature inside the refrigerator 17 rises cannot be absorbed by the expanded breather bag 19, so the inside of the refrigerator 17 becomes positive pressure.
CA gas leaks out of the refrigerator. Also refrigerator 1
If the circulation blower 12 is installed immediately downstream of 7,
The inside of the refrigerator 17 becomes negative pressure, and the blizzard bag 19
remains deflated. Therefore, the pressure decrease when the temperature inside the refrigerator 17 decreases cannot be absorbed by the breather bag 19 which is still contracted, so that the inside of the refrigerator 17 becomes a negative pressure and fresh air from the atmosphere enters the inside of the refrigerator.

Therefore, in the present invention, the refrigerator 17 and the carbon dioxide generator 7 are connected, and the purification catalyst 13, the air preheater 14, and the cooler 1 are downstream of the carbon dioxide generator 7.
5. A circulation blower 12 and a scrubber 16 are arranged in this order, and the scrubber 16 and a refrigerator 17 are connected.
In this way, since the circulation blower 12 is placed between the scrubber 16 and the carbon dioxide generator 7, which has a very large pressure drop in the circulation path, the positive pressure generated before and after the circulation blower 12 can be reduced. The negative pressure is absorbed by the scrubber 16 and the carbon dioxide generator 7, and the air blowing pressure of the circulation blower 12 is applied to the refrigerator 17.
The pressure inside the refrigerator 17 becomes zero because it does not affect the interior of the refrigerator 17.

Therefore, since the breather bag 19 maintains its normal size, it can sufficiently absorb pressure fluctuations due to temperature changes inside the refrigerator 17. As a result, the pressure inside the refrigerator 17 can be suppressed from increasing or decreasing, and the CA gas inside the refrigerator 17 can be prevented from flowing out of the refrigerator 17 and the atmosphere can be prevented from entering the inside of the refrigerator.

Although the above description has been made regarding solid fuel combustion furnaces, similar effects can be obtained with gaseous fuel and liquid fuel combustion furnaces.

Effects of the Invention The present invention connects a refrigerator and a carbon dioxide generator, and arranges a purification catalyst, an air preheater, a cooler, a circulation blower, and a scrubber in this order downstream of the carbon dioxide generator, and connects the scrubber and the refrigerator. By doing this, the increase and decrease of pressure inside the refrigerator is suppressed, and the inside of the refrigerator is
It is possible to prevent CA gas from leaking out of the chamber and preventing atmospheric air from entering the chamber.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a fresh produce storage device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional fresh produce storage device. 7... Carbon dioxide generator, 12... Circulating blower, 13... Purification catalyst, 14... Air preheater, 15... Cooler, 16... Scrubber, 17...
...refrigerator, 19...blizzard bag.

Claims (1)

[Claims] 1. A refrigerator having a breather bag is connected to a carbon dioxide generator that supplies carbon dioxide to the refrigerator by burning fuel in a combustion section provided inside, and a purification catalyst is provided downstream of the carbon dioxide generator, An air preheater for exchanging heat between exhaust gas from the carbon dioxide generator and combustion air is provided downstream of the purification catalyst, a cooler is provided downstream of the air preheater, and combustion air is provided downstream of the cooler. A circulation blower is provided to circulate the air in the refrigerator and supply it to the carbon dioxide generator, and a scrubber is provided downstream of the circulation blower to keep the carbon dioxide concentration in the refrigerator at a set value, and the scrubber and the A perishables storage device characterized by being connected to a refrigerator.