JPH02203717A - Apparatus for storing perishables - Google Patents

Abstract

PURPOSE:To shorten the time of electrical conduction to heated parts, such as heater, required for combustion and reduce power consumption by providing a preheater for preheating air fed to combustion of a fuel in a combustion furnace at a specific position. CONSTITUTION:A preheater 12' for preheating air fed to combustion of a fuel 19 in a combustion furnace 12 is provided so as to contact the upper part of the combustion furnace. Air circulated from a storage chamber 1 is subjected to heat exchange with high-temperature combustion gases and preheated in the preheater and simultaneously preheated with heat conduction from the combustion furnace. Thereby, the time of electrical conduction to an ignition heater 21 used for combustion may be short.

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 alteration and decomposition by microorganisms and oxidation.

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, and a cooling bag @4' consisting of an evaporator 2' and a condensing unit 3' is provided. 6'
is a propane gas cylinder, and the carbon dioxide gas generator 6' is supplied with air introduced from the storage 1' through the inlet pipe 7', and the oxidation catalyst is used as a medium to combust C3H8+502-+3.
CO2-1-4H20+531 ' After adsorbing excess carbon dioxide gas (CO2), that is, combustion exhaust gas generated in the do reaction, it is returned to the storage 1' through a discharge pipe 11'. A gas monitor 12' detects the gas concentration in the storage 1' and controls the carbon dioxide gas generator 8' and the carbon dioxide adsorption device 9' in a timely manner.

Problems to be Solved by the Invention However, with the above configuration, it is necessary to constantly heat the oxidation catalyst with an electric heater in order to burn propane gas in the carbon dioxide generator 6' with air introduced from the storage 1'. Ta. As a result, electricity costs were high, and since the electric heater was constantly energized, there were problems with durability.

In view of the above-mentioned problems, the present invention provides a fresh produce storage device that saves power during combustion and improves the durability of heating components such as heaters.

Means for Solving the Problems In order to solve the above-mentioned problems, the perishables storage device of the present invention has the following features:
The combustion furnace is equipped with a preheater for preheating the air used for combustion of fuel in the combustion furnace, and the preheater and the combustion furnace are provided in contact with each other on at least one side.

Effect The present invention has the above-described configuration in which the low-temperature air circulated from the storage is preheated by the preheater, and the preheater and the combustion furnace are provided in contact with each other on at least one side, so that the heat is not received by heat conduction from the combustion furnace. By increasing the preheating effect of the preheater,
Since it is used for burning fuel in a combustion furnace, it is possible to shorten the energization time of heating parts such as heaters necessary for combustion.
This results in power savings and improved durability.

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 pre-7 refrigerator for storing perishables, and includes a compressor 2, a condenser 3, an evaporator 4,
A cooling device 7 consisting of a blower 5.6 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 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 is arranged between a combustion furnace 12 and a combustion furnace. It consists of a preheater 12', which is provided in contact with the upper part of the combustion gas, and which exchanges heat with the combustion gas to preheat the air used for combustion, and a combustion gas 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 to the combustion furnace 12 through the introduction pipe 10, and also directs the combustion gas generated in the combustion furnace 12. After being cooled by the cooler 13, it is led to the carbon dioxide adsorption device 9 through the 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 having an air passage 17 formed between the inner casing 16 and the inner casing 16 for supplying secondary combustion air, and a heat insulating pipe 16 inside the heat insulating pipe 16. A grate 2o on which solid fuel 19 is placed, and a solid fuel 1 that heats combustion air.
It is composed of an ignition heater 21 for combusting the fuel. The solid fuel 19 is highly pure carbon, and upon combustion, the combustion gas becomes carbon dioxide (Co2) and nitrogen (N2) through a reaction of C+O2+N2→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. An inlet pipe 24, 25 and an exhaust pipe 2 are connected to the two adsorbers 22 and 23 so that the combustion gas alternately circulates.
6, 27, and switching valves 28 and 29 for switching the flow. Inside the adsorber 22.23, an adsorbent 30.
31 is filled with carbon dioxide gas (CO2), and when the adsorption capacity decreases, the blower 32 switches the outside air to the switching valve 33. Inlet pipe 34 connected to outlet pipe 26.27
Alternatively, the configuration is such that air is blown to the adsorber 22 or 23 through 35, desorbs carbon dioxide gas, and is exhausted to the atmosphere from an exhaust pipe 39 through an exhaust pipe 36, 37 connected to the inlet pipe 24 or 26, and a switching valve 38. ing.

For example, when the adsorber 22 is performing an adsorption function and the adsorber 23 is performing a desorption function, the switching valves 28 and 29 are opened in the direction in which the combustion gas flows through the combustion gas inlet pipe 24, adsorber 22, and discharge pipe 26. Furthermore, the switching valves 33 and 38 are opened in the direction in which outside air flows through the inlet pipe 36, the adsorber 23, and the exhaust pipe 37 by the blower 32, and is exhausted to the atmosphere through the exhaust pipe 39. The exhaust pipe 4o connects the switching pulp 29 and the storage. Reference numeral 41 is a switching pulp installed in the introduction pipe 10 and having one side open to the atmosphere. A switching pulp 42 is provided between the cooler 13 and the blower 14, and the introduction pipe 1° and the switching pulp 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 46 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 a gas monitor 46.
A sampling tube 47 is connected thereto.

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

The atmosphere inside storage 1 was initially N279%, 0221'%.
When the carbon dioxide gas generator 8 is operated, the air inside the refrigerator is transferred to the inlet pipe 10 and the chamber 4 by the blower 14.
6. A barrel that is introduced to the outside of the tube of the preheater 12' through the switching pulp 41, is introduced into the combustion furnace 12 through the air passage 17, is heated by the ignition heater 21, and is used for combustion of the solid fuel 19.

C+ 02 + N 2 →CO2" The combustion gas becomes carbon dioxide (Co□) and nitrogen (N2) through the reaction of N2, and after cooling the inside of the tube of the preheater 12' in the condenser cooler 13, it is connected. Through the pipe 11, it passes through the switching pulp 42 and the blower 14, and further passes through the switching pulp 28 and the introduction pipe 24 to enter the adsorber 22. Here, carbon dioxide (Co2) is adsorbed by the adsorbent 3o and becomes nitrogen (N2). ) is the only discharge pipe 2θ
, the pulp passes through the switching pulp 29 and is circulated to the storage 1 through the exhaust pipe 4o.

After a certain period of time, the adsorber in which combustion gas circulates
To switch from 2 to 23, press the switch bar 1Lty"28.

29 is switched, passes through the switching pulp 28 and the introduction pipe 26, 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 pulp 29, and is circulated to the storage 1 through the exhaust pipe 4o. After a certain period of time has passed again, the adsorber 2
2.23 switches and the combustion gas alternately circulates. During this time, the adsorbent 30.3 filled in the adsorber 23.23
1 reaches the limit of carbon dioxide gas (Co2) adsorption capacity, and carbon dioxide gas (C02) in the combustion gas can no longer be adsorbed.
The gas is exhausted into the storage 1 through the exhaust pipe 4o, and the carbon dioxide (C02) concentration within the storage 1 begins to gradually increase. ys
This is the state of the storage 1, which has a size of . During this time, the oxygen (O2) concentration in the storage 1 continues to decrease from the initial 21°. The gas concentration in storage 1 is
Oxygen (O2) 6%, carbon dioxide gas (Co) 5%, nitrogen (
N2) If 90% is the predetermined value, when the gas monitor 46 detects by sampling the gas in the chamber 46 that the carbon dioxide in the storage 1 has increased to 5%, the carbon dioxide adsorbs. The blower 32 for desorption of the device 9 is operated, and regeneration of the adsorbent in the adsorber is started. For example, when the adsorber 22 is adsorbing carbon dioxide (C02) as combustion gas circulates, the adsorber 23 is adsorbed by the blower 3.
2, outside air is switched to pulp 33° introduction pipe 36. Carbon dioxide (Co2) is desorbed and regenerated by passing through the exhaust pipe 27 and being blown onto the adsorbent 31. This is done alternately at regular intervals, so carbon dioxide (C
o2) Maintain the concentration at the predetermined 6s. On the other hand, oxygen (02)
During that time, the concentration continues to decrease as it is being used for combustion, 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 are stopped. let Now, the storage begins when the gas concentration in the storage 1 reaches the predetermined gas concentrations of 6% oxygen (02), 5% carbon dioxide (Co2), and 90% nitrogen (N2).

At the same time as detecting that the oxygen (02) concentration has reached the predetermined level, the switching pulps 41 and 42 switch the inlet pipe 10 and connecting pipe 4
3. The connecting pipe 11 is switched so as to be in communication with each other. Thereafter, by operating the blower 14 at regular intervals and detecting the gas in the chamber 46 with the gas monitor 46, the storage 1
When 6% of the carbon dioxide (Co2) 75 produced by the respiration of fresh food stored in the storage compartment is stored, the carbon dioxide adsorption device 9 works and absorbs carbon dioxide (Co2) until a predetermined concentration is reached.
). To explain this operation, gas monitor 4
6 exceeds a predetermined concentration, the blower 14
is operated, and the gas in the storage 1 is transferred to the inlet pipe 10. It passes through the switching valve 41, the connecting pipe 43, the switching valve 42, the blower 14, the connecting pipe 11, the switching valve 28, and the introduction pipe 24, and is introduced into the adsorber 22, and excess carbon dioxide (C02) is adsorbed by the adsorbent 3o. Furthermore, a discharge pipe 26 and a switching valve 29 are provided.
, passes through the exhaust pipe 40 and circulates to the storage 1. On the other hand, the adsorber 23 receives outside air by a blower 32 through a switching valve 33 ,
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 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 value of 6 inches, 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 36.
, the exhaust pipe 27, the switching valve 29, and the exhaust pipe 40, and are 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)
The blower 14 is operated by turning on the gas in the storage 1 through the inlet pipe 10. Switching valve 41, connecting pipe 4
3. It passes through the switching valve 42, the connecting pipe 11, the switching valve 28, the introduction pipe 26, 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 path includes 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 28 is switched to communicate with the inlet pipe 24, and the switching valve 33 is switched to communicate with the inlet pipe 34.

As described above, the present invention provides a preheater for preheating the air used for combustion of fuel in the combustion furnace, and by providing this preheater in contact with the upper part of the combustion furnace, the low temperature air circulated from the storage Since the air is preheated by heat exchange with high-temperature combustion gas in the preheater and at the same time by heat conduction from the combustion furnace, the energization time of the ignition heater 21 for combustion can be shortened, which saves power. and ignition heater 2
The durability of No. 1 can be improved.

Effects of the Invention As described above, the present invention includes a preheater for preheating the air used for combustion of fuel in a combustion furnace, and by providing the preheater and the combustion furnace in contact with each other on at least one side, the low temperature air circulated from the storage is heated. is preheated by heat exchange with high-temperature combustion gas in the preheater, and at the same time by heat conduction from the combustion furnace, it is possible to shorten the energization time of the ignition heater for combustion, resulting in power savings and ignition. It is possible to improve the durability of the heater.

[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, 12
'...Preheater, 14...Blower, 19
...Solid fuel, 22゜23...Adsorber.

Claims (1)

[Claims] a storage for storing perishables; a combustion furnace for burning carbon-containing fuel to introduce carbon dioxide gas into the storage;
The combustion furnace includes a blower that circulates air from the storage to be used for combustion of the fuel, and a preheater that preheats the air that is used for combustion of the fuel in the combustion furnace, and the preheater and the combustion furnace cover at least one side. A fresh food storage device characterized in that the devices are installed adjacent to each other.