JPH0376508A - Apparatus for storing perishable material - Google Patents

Abstract

PURPOSE:To control combustion rate within a certain range by varying the air-feeding rates through a primary air nozzle for the combustion of a fuel and through a secondary air nozzle for the combustion of incomplete combustion gas according to the strength of drafting effect and providing an orifice for secondary air. CONSTITUTION:A carbon-containing fuel 110 is burned in a combustion furnace 102 and the generated carbon dioxide gas is supplied to a perishable material storage chamber 1. Air for the combustion of the fuel 110 is circulated from the storage chamber 1 to the combustion furnace 102 with a blower 16. Air supplied for the combustion of the fuel in the combustion furnace 102 is preheated with a preheater 103 and the combustion gas generated in the combustion furnace 102 and passed through the preheater 103 is cooled with a cooler 104. An air duct 107 in the combustion furnace 102 is provided with a primary air nozzle 112 and air for the combustion of the fuel is supplied through the nozzle. Air for burning incomplete combustion gas in the combustion gas is supplied through a secondary air nozzle 116 contacting with the combustion gas. The nozzle is provided with an orifice 116' for secondary combustion air.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a fresh produce storage device that enables long-term storage of fresh produce such as vegetables and fruits at the production site or distribution stage.

BACKGROUND OF THE INVENTION Refrigerated storage is a common means of storing perishables, but in addition to this, another long-term storage method is storage that changes the air composition within the storage room. Tsuma b1 Reduces the oxygen (02) concentration in the storage chamber and 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 alteration and decomposition by microorganisms and oxidation.

Referring to the drawings below, this conventional Japanese Patent Application Laid-open No. 63-
Publication No. 201407 will be explained with reference to FIG. 3.

In the figure, reference numeral 1 denotes a storage such as a pre-fabricated refrigerator for storing perishables, and a cooling device 7 including a compressor 2, a condenser 3, an evaporator 4, blowers 5 and 6, and the like is mounted on the top. Connected to the storage 1 are a carbon dioxide gas generator 8 for filling the interior with carbon dioxide gas CO2, and a carbon dioxide adsorption device 9 for adsorbing and removing excess carbon dioxide gas CO2 in the combustion gas. The carbon dioxide gas generator 8 is configured between an introduction pipe 10 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.
It is composed of a combustion furnace 12, a catalyst tube 13, a preheater 14, and a cooler 16. Reference numeral 16 denotes a blower, which is installed in the connecting pipe 11 between the cooler 16 and the carbon dioxide adsorption device 9, and is connected to the inlet pipe 1.
0, the air in the storage 1 is guided to the carbon dioxide generator 8,
It is sent to the carbon dioxide adsorption device 9 through the connecting pipe 11.

The combustion furnace 12 includes an inner casing 18 having a heat insulating pipe 17 on its inner surface, and an inner casing 18 for supplying secondary combustion air.
8, an outer casing 21 with a heat insulating pipe 2o on the inner surface forming an air passage 19 between the outer casing 21, a grate 23 on which a solid fuel 22 is placed inside the heat insulating pipe 17, and a grate 23 that heats combustion air to heat the solid fuel 2.
It is composed of an ignition heater 24 for combusting 2.

The inner casing 18 and the outer casing 21 partition the air passage 19 into upper and lower sections with a partition plate 26.

Reference numeral 26 denotes a branch part for the combustion air to be circulated to the combustion furnace 12. 1 This branch part 26 and the lower part of the combustion furnace 12 are connected to a connecting pipe 27.
and the branch part 26 and the air passage 19 of the combustion furnace 12
It is connected to the upper part of the body by a connecting pipe 28.

The solid fuel 22 is a combustion fuel of high purity carbon.
Through the reaction of 02 + N2 → CO2 + N2, the combustion gas becomes carbon dioxide gas CO2 and nitrogen (N2).

Reference numeral 29 is a connecting pipe for guiding combustion gas from the combustion furnace 12 to the catalyst tube 13, and is provided with a heat insulating pipe 30 on the inner surface.

The catalyst tube 13 is provided with a shift filter 33 in the upper part and two catalysts 34 in the lower part thereof in a casing 32 equipped with a heat insulating pipe 31. 36 is a heater for heating the catalyst, and is installed between the two catalysts 34. Reference numeral 36 is a connecting pipe for guiding the combustion gas from the catalyst pipe 13 to the preheater 14, and is provided with a heat insulating pipe 37 on the inner surface. The preheater 14 includes a heat exchanger 4o inside a casing 39 that includes an insulated pipe 38. The heat exchanger 40 is
It is composed of a plurality of pipes 41 and a plurality of fins 42 arranged on the outside of the pipe so that air flows in a meandering manner.

The combustion gas that has circulated through the catalyst tube 13 passes through the pipe of the heat exchanger 4o, and the air inside the storage 1 introduced through the introduction pipe 1o is passed through the upper inlet 43 on the outside of the pipe, and the air is transferred to the lower outlet. 44, the outside of the pipe is meandered and circulated, and a connection pipe 46 connected to the outlet part 44 connects the branch' part 26.
It is connected to 46 is a connecting pipe that leads combustion gas from the preheater 14 to the cooler 16. 47 is a cooling fan for the cooler.

On the other hand, the carbon dioxide adsorption device 9 is for adsorbing excess carbon dioxide C02 in the combustion gas and discharging it outside the storage 1. Inlet pipes 50, 51 and discharge pipe 52 are connected to the two adsorbers 48 and 49 so that combustion gas alternately circulates.
．． 53, switching pulp 64°65. Adsorbents 56 and 57 are filled in the adhesive applicator 48 and 49 to adsorb carbon dioxide gas Co2, and when the adsorption capacity decreases, a blower 58 switches the outside air to the pulp 69 and exhaust pipe 6.
Air is blown to the adsorber 48 or 49 through the inlet pipe 6o or 61 connected to the inlet pipe 6o or 63 to desorb carbon dioxide gas, and the discharge pipe 62, connected to the inlet pipe 6o or 61,
63, the switching pulp 64 is configured to pass hot water and be exhausted to the atmosphere through an exhaust pipe 66.

For example, when the adsorber 48 is performing an adsorption function and the adsorber 49 is performing a desorption function, the switching pulps 54 and 55 are set so that the combustion gas flows in the direction in which the combustion gas passes through the inlet pipe 50, the adsorber 48, and the discharge pipe 62. It opens, and the switching pulp 59.64 is
The outside air is supplied by the blower 58 to the introduction pipe 61, the adsorber 49,
The exhaust pipe 65 passes through the exhaust pipe 63 and opens in the flow direction.
It is exhausted to the atmosphere. The exhaust pipe 66 is a switching pulp 56
and storage are connected.

Reference numeral 67 is a switching pulp installed in the introduction pipe 10 and having one side open to the atmosphere. A switching pulp 68 is provided between the cooler 15 and the blower 16, and the introduction pipe 1o and the switching pulp 68 are connected by a connecting pipe 69. 70
is a controller that controls the air volume of the blower 16;
The air volume is determined based on a signal from a gas monitor 71 that detects the gas concentration in the storage 1 so that the amount of oxygen passing through the combustion furnace 12 is constant. Reference numeral 72 denotes a chamber, a container provided in the introduction pipe 1o between the storage 1 and the switching pulp 67, and a container provided in the sampling tube 73 of the gas monitor 71.
are connected.

Problems to be Solved by the Invention However, in the above configuration, in order to reduce the oxygen concentration in the storage, a gas monitor detects the gas concentration in the storage, and the air volume of the blower is adjusted to keep the amount of oxygen passing through the combustion furnace constant. The controller is used to control the
The problem was that the gas monitor's signal output function according to the gas concentration and the controller were expensive.

In view of the above-mentioned problems, the present invention provides an inexpensive fresh food storage device for reducing oxygen concentration.

Means for Solving the Problems In order to solve the above-mentioned problems, the perishables storage device of the present invention includes a preheater installed at the upper part of the combustion furnace for preheating the air to be used as fuel in the combustion furnace, and a A cooler installed above the preheater that cools the combustion gas that has passed through the preheater, and 1 that supplies air for fuel combustion provided in the air passage inside the combustion furnace.
The secondary air hole, which is provided in contact with the combustion gas, and supplies air for combustion of the incomplete combustion gas in the combustion gas, and the passage of the combustion gas near the downstream side of the part in contact with the secondary air hole. It is equipped with a diaphragm in the section.

Operation According to the above-described structure, the combustion gas of the present invention rises and flows from the combustion furnace to the preheater and the cooler when the fuel is combusted. Therefore, due to the so-called draft effect,
If there is a large amount of air supplied from the secondary air holes, if there is little air supplied from the primary air holes for fuel combustion, combustion will be suppressed, and if the combustion is reduced, the draft effect will be weak. Again, combustion is promoted by increasing the supply of air from the primary air hole. In addition, by providing a restriction in the passage area near the downstream side of the part where the combustion gas contacts the secondary air hole,
The amount of mixture of incomplete combustion gas and secondary combustion air increases, allowing more efficient secondary combustion.

In this way, it becomes possible to control combustion within a certain range, eliminating the need for particularly expensive functional parts for controlling air volume, making it cheaper in terms of cost, and more efficient.
The next step will be combustion.

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 the description, parts that are the same as the conventional one will be given the same numbers, and parts that are different from the conventional one will be given the numbers 101 and 101.

In Figure 1, button 1 is a storage such as a derefabricated refrigerator for storing perishables, including a compressor 2, a condenser 3, an evaporator 4,
A cooling device 7 consisting of blowers 6, 6 is mounted on the top. Connected to the storage 1 are a carbon dioxide gas generator 101 for filling the interior with carbon dioxide gas C02, and a carbon dioxide adsorption device 9 for adsorbing and removing excess carbon dioxide gas C02 in the combustion gas. . The carbon dioxide gas generator 101 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 connected to a combustion furnace 102 and a combustion furnace. It is composed of a preheater 103 which is provided in contact with the upper part of the combustion gas and preheats the air used for combustion by exchanging heat with combustion gas, and a combustion gas cooler 104. A blower 16 is installed in the connecting pipe 11 between the cooler 104 and the carbon dioxide adsorption device 9, and guides the air in the storage 1 through the introduction pipe 1o to the combustion furnace 102.
After cooling the combustion gas generated in the cooler 104, the combustion gas is introduced into the combustion furnace 102 through the connecting pipe 11 to the carbon dioxide adsorption device 9.
The inner casing 106 has a heat insulating pipe 105 on its inner surface, and an outer casing 109 has a heat insulating plate 108 on its inner surface, forming an air passage 107 between the inner casing 106 and the inner casing 106 for supplying combustion air. ing. A solid fuel 11o is filled in the heat insulating pipe 105 of the inner casing 106. 111 is a grate on which solid fuel 110 is placed. 112 is an ignition heater, which is installed in the air passage 107.
Combustion air supplied through the secondary air hole 112' is heated to combust the solidified fuel 110. The solid fuel 110 is made of highly pure carbon.
In the reaction of o2+N2, 2 combustion gas becomes carbon dioxide Co and nitrogen N2.

113 is a partition plate that directs combustion air to the primary air hole 112.
A heat insulating plate 108 provided on the inner surface of the outer casing 109 is provided between the inner casing 106 and a heat insulating plate 108 provided on the inner surface of the outer casing 109 to form the air passage 107 for guiding the air into the inner casing 106 . The air passage 107 connects the combustion furnace 102 and the preheater 1.
The upper end is opened to an outer tube outlet 115 for combustion air provided on the contact surface 114 with the inner casing 103, and the lower end is opened into the combustion furnace 102 which communicates with the inner casing 106. 116 is 2
The secondary combustion air hole is provided to communicate between the air passage 107 and the inside of the heat insulating pipe 105, and is opened in a portion through which the combustion gas after reacting with the solid fuel 110 passes. Reference numeral 116' is a diaphragm, which is provided so as to cover the upper part of the inner casing 106. The preheater 103 includes a pipe 118 through which high-temperature combustion gas flows from the inside entrance 117 of the pipe, and fins 1 configured so that heating air flows in a meandering manner around the outside of the pipe 118.
19 is placed in contact with the combustion furnace 102 at the contact surface 1106. 120, 121 are
This is a cover that covers the preheater 103. A heat insulating plate 122 is provided on the inner surface of the cover 120. The cooler 104 is connected to the pre-p! p: A cooling fan 123 is provided which extends the pipe 118 of the vessel 103 and cools the pipe 118.

Reference numeral 124 is a catalyst, which functions to oxidize carbon monoxide generated by incomplete combustion in the combustion gas and replace it with carbon dioxide. The catalyst 124 has a through-cylindrical portion 126 provided in a part of a case 125 that partitions a combustion gas flow path.
and is provided above the inner casing 106. A heat shield plate 127 is provided below the catalyst 124 to protect the catalyst 124 from combustion heat. 128
is a cylindrical filter that is provided around the catalyst 124 and placed on the heat shield plate 127 to remove ash from the solid fuel. 129 is a heater for heating the catalyst.

On the other hand, the carbon dioxide adsorption device 9 is for adsorbing excess carbon dioxide C02 in the combustion gas and discharging it outside the storage 1. Inlet pipes 50, 51 and discharge pipe 52 are connected to the two adsorbers 48 and 49 so that combustion gas alternately circulates.
, 53, and switching valves 54, 55 for switching the flow. Inside the adsorber 48.49, there is an adsorbent 56.5
7 is filled and the button b1 adsorbs carbon dioxide C02 and the adsorption capacity decreases, the blower 68 switches the outside air to the valve 6.
9. Air is blown to the adsorber 48 or 49 through the introduction pipe 60 or 61 connected to the discharge pipe 52.53 to desorb carbon dioxide gas, and the discharge pipe 62.63 connected to the introduction pipe 50 or 51 is switched. Exhaust pipe 65 through valve 64
The structure is designed to allow more air to be exhausted into the atmosphere.

For example, when the adsorber 48 is performing an adsorption function and the adsorber 49 is performing a desorption function, the switching valves 54 and 55 are connected to the combustion gas introduction pipe 50. The button υ is opened in the direction in which the outside air flows through the adsorber 48 and the discharge pipe 62, and the switching valve 59. The exhaust pipe 66 opens toward the atmosphere and exhausts the air to the atmosphere. The exhaust pipe 66 connects the switching valve 66 and the storage. Reference numeral 67 is a switching valve installed in the inlet pipe 10 and having one side open to the atmosphere. Reference numeral 68 denotes a switching valve, which is provided between the cooler 104 and the blower 16, and is connected to the introduction pipe 10 and the switching valve 6 by a connecting pipe 69.
8 is connected.

The air volume is determined by a signal from a gas monitor 71 that detects the gas concentration in the storage 1. 72 is cha/bar,
A container provided in the inlet pipe 1o between the storage 1 and the switching valve 67 is connected to a sampling tube 73 of a gas monitor 71.

Regarding the fresh food storage device configured as described above, the first
The operation will be explained using FIG. Introduction pipe 10, chamber 72, switching valve 6
The solid fuel 110 is introduced into the combustion furnace 102 through the discharge port 116 air passage 107 and heated by the ignition heater 112. is subjected to combustion. C+020N2→c
Due to the reaction of O2 + N2, the combustion gas becomes carbon dioxide gas C02 and nitrogen N2, passes through the filter 127, and is heated to the catalyst 12.
After completely oxidizing and purifying the carbon monoxide generated by incomplete combustion in step 3 and cooling it in the cooler 104 passing inside the tube of the preheater 103, the connecting tube 11 connects the switching valve 68 and the blower 16.
, further passes through the switching valve 64 and the introduction pipe 5o, and enters the adsorber 48. Here, carbon dioxide C02 is absorbed by the adsorbent 6
Only the nitrogen N2 adsorbed by the nitrogen gas 6 passes through the exhaust pipe 62 and the switching valve 65, and circulates to the storage 1 through the exhaust pipe 66. After a certain period of time has elapsed, the switching valve 54.
55 is switched, passes through the b1 switching pulp 64, the introduction pipe 51, and enters the adsorber 49. Here, the carbon dioxide gas CO2 is again adsorbed by the adsorbent 67, and only the nitrogen N2 is discharged from the exhaust pipe 63.
It passes through the switching valve 55 and circulates to the storage 1 through the exhaust pipe 66.

After a certain period of time has elapsed again, the adsorbers 48 and 49 are switched, and the combustion gas is alternately circulated. During this time, the adsorber 48.4
The adsorbent $tJ58j57 filled in the storage compartment 1 reaches the limit of its adsorption capacity for carbon dioxide CO2, and the carbon dioxide CO2 in the combustion gas cannot be adsorbed completely. As a result, the concentration of carbon dioxide gas CO2 in the storage 1 begins to gradually increase. 5 tyl size storage 1
This is about 2 hours after the start of operation. During this time, the oxygen 02 concentration in the storage 1 continues to decrease by 21q6 at first.

The gas concentration in storage 1 is oxygen 02=s%, carbon dioxide C
Assuming that o2=s% and nitrogen N2=eo% are predetermined values, the gas monitor 71 can detect that the carbon dioxide in the storage 1 has increased to 6% by sampling the gas in the chamber 72. When detected, the carbon dioxide adsorption device 9
The blower 68 for desorption is operated, and regeneration of the adsorbent in the adsorbent is started. For example, if the adsorber 48 is adsorbing carbon dioxide gas CO2 as combustion gas circulates, the adsorber 49
The outside air is supplied by the blower 68 to the switching valve 69 and the inlet pipe 61 . The carbon dioxide CQ2 is desorbed and regenerated by passing through the exhaust pipe 53 and being blown onto the adsorbent 57. Since this is performed alternately at regular intervals, the concentration of carbon dioxide C02 in the storage 1 is maintained at a predetermined level of 6. On the other hand oxygen 02
During this time, the concentration continues to decrease as it is being used for combustion, and reaches the predetermined 5% after 10 hours, which is detected by the gas monitor 71, and the carbon dioxide gas generator 101 and carbon dioxide adsorption device 9 are stopped. let With this, storage is started with the predetermined gas concentrations in the storage 1 being oxygen 02=s%, carbon dioxide C02=5%, and nitrogen N2=90%. At the same time as detecting that the oxygen 02 concentration has reached the predetermined 5%, the switching valve 6
7.68 is switched so that the introduction pipe 10, the connecting pipe 69, and the connecting pipe 11 are connected to each other.

After that, the blower 16 is operated at regular intervals, and the chamber 7 is
By detecting the gas in the storage compartment 1 with the gas monitor 71, when the carbon dioxide gas CO2 generated by the respiration of the fresh food stored in the storage compartment 1 exceeds a predetermined value of 5 flies, the carbon dioxide adsorption device operates and Carbon dioxide gas CO until it reaches a concentration
Adsorb 2. To explain this operation, gas monitor 7
1 exceeds a predetermined concentration, the blower 16
is operated, and the gas in the storage 1 is transferred to the inlet pipe 10 and the connecting pipe 69.
, passes through the switching valve 68, the blower 16, the connecting pipe 11, the switching valve 54, and the introduction pipe 5o, and is introduced into the adsorber 48,
Excess carbon dioxide gas C02 is adsorbed by the adsorbent 66, and further passes through the exhaust pipe 52, the switching valve 65, and the exhaust pipe 66, and is circulated to the storage.

On the other hand, in the adsorber 49, outside air is passed through a switching valve 59, an inlet pipe 61, and an exhaust pipe 63 by a blower 58, and an adsorbent 57
Carbon dioxide gas CO2 is desorbed and regenerated. Since this is applied alternately at regular intervals, the carbon dioxide C02 concentration in the storage returns to the predetermined concentration.

In addition, oxygen 02 becomes insufficient due to the respiration of fresh food.
When the amount becomes less than a predetermined value of 6, outside air is introduced into the storage 1 by the blower 58 and replenished.

The introduction route includes a blower 58, a switching valve 59, and an introduction pipe 61.
, passes through the exhaust pipe 63, the switching valve 66, and the exhaust pipe 66,
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 16 is operated by turning on the gas in the storage 1 through the inlet pipe 10. Connecting pipe 69, switching valve 6
8, it passes through the connecting pipe 11, the switching valve 64, the inlet pipe 61, and the discharge pipe 63, and is released into the atmosphere. At the same time, the blower 68
outside air is introduced into the storage 1. The path is the blower 6
8, switching pulp 69, inlet pipe 60, discharge pipe 52, switching valve 56, and exhaust pipe 66. When the gas monitor 71 detects that the gas in the storage 1 has become equal to the outside air, the blower 16.58 is stopped, and the switching pulp 64 is inserted into the inlet pipe 5o.
The switching pulp 59 is switched so as to communicate with the introduction pipe 6o.

As described above, according to this embodiment, there is a preheater installed at the top of the combustion furnace that preheats the air used for combustion of fuel in the combustion furnace, and a preheater that cools the combustion gas generated in the combustion furnace and passed through the preheater. A cooler installed at the top of the combustion furnace, a primary air hole provided in the air passage in the combustion furnace to supply air for combustion of fuel, and a primary air hole provided in contact with the combustion gas to combust incompletely burned gas in the combustion gas. When one fuel is combusted, combustion gas flows upward from the combustion furnace to the preheater and the cooler. For this reason, due to the so-called draft effect, combustion is suppressed when more air is supplied from the secondary air holes and less air is supplied from the primary air holes for fuel combustion. When the amount decreases, the draft effect becomes weaker, and υ combustion is promoted by supplying more air from the primary air hole. In addition, by providing a restriction in the passage area near the downstream side of the part where combustion gas contacts the secondary air hole, the amount of mixture of incomplete combustion gas and secondary combustion air increases, making it more efficient. Secondary combustion is possible.

In this way, it becomes possible to control combustion within a certain range, there is no need for particularly expensive functional parts that control air volume, the cost is low, and it is more efficient.
The next step will be combustion.

Effects of the Invention As described above, the present invention provides a preheater provided at the upper part of the combustion furnace for preheating the air used for combustion of fuel in the combustion furnace, and a preheater for cooling the combustion gas generated in the combustion furnace and passed through the preheater. A cooler installed at the top of the combustion furnace, a primary air hole installed in the air passage in the combustion furnace that supplies air for the combustion of fuel, and a primary air hole installed in the air passage in the combustion furnace to supply air for combustion of the fuel, and a By providing a secondary air hole that supplies air for combustion,
As the fuel burns, combustion gas flows upward from the combustion furnace to the preheater and cooler. For this reason, due to the so-called draft effect, more air is supplied from the secondary air holes and less air is supplied from the primary air holes for fuel combustion, and combustion is suppressed. If the amount decreases, the draft effect will become weaker. However, more air will be supplied from the primary air hole, and combustion will be promoted. In addition, by providing a restriction in the passage area near the downstream side of the part where combustion gas contacts the secondary air hole, the amount of mixture of incomplete combustion gas and secondary combustion air increases, and the secondary combustion air is efficiently Can be burned.

In this way, it is possible to control combustion within a certain range, there is no need for particularly expensive functional parts that control air volume, the cost is low, and the secondary This means that it can be combusted.

[Brief explanation of drawings]

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 internal gas components due to the same device, and Fig. 3 is a block diagram of a conventional fresh food storage device. be. 1...Storage, 16...Blower, 10
2. River... Combustion furnace, 103... Preheater, 107
・・・・・・Air path, 11°・・・Fuel, 112・
...Primary air hole, 116...Secondary air hole, 116'...Aperture υ.

Claims (1)

[Claims] a storage for storing perishables; a combustion furnace for burning fuel containing carbon in order to introduce carbon dioxide gas into the storage;
a blower that circulates air from the storage to be used for combustion of the fuel in the combustion furnace; a preheater provided at the upper part of the combustion furnace that preheats the air used for combustion of the fuel in the combustion furnace; a cooler provided above the preheater to cool the combustion gas that has passed through the preheater; and a cooler provided in the air passage in the combustion furnace to supply air for combustion of fuel.
A secondary air hole is provided in contact with the combustion gas and supplies air for combustion of incompletely combusted gas in the combustion gas, and a secondary air hole is provided near the downstream side of the part in contact with the secondary air hole of the combustion gas. A perishables storage device characterized by comprising a diaphragm provided in a passage section.