JP2001059679A - Cold air drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cold air drier which can dry the substance to be dried, at a low-desirable temperature so as to maintain quality satisfactory. SOLUTION: A cold air drier 1 is equipped with a storage 2 for substance 10 to be dried, and an air conditioning chamber 4 with a built-in refrigerant circuit R. The condenser 31 of the refrigerant circuit R is disposed, with its one part 31a exposed into the air conditioning chamber 4 and with its residual part 31b exposed out of the machine 4. Moreover, this cold air drier is equipped with an indoor blower 16 which sends indoor air into one part 31a of the condenser 31, exposed into the air conditioning chamber 4, an outside air blower 17 which sends air to the residual part 31b exposed out of the machine, a in- storage temperature sensor 19 which detects the in-storage temperature, and an air blast amount control means 20, which controls the quantity of blast being sent from the indoor blower 16 and/or the outside air blower 17 to the condenser 31, so that the interior of the storage 2 becomes the prescribed low temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cool air drying apparatus for drying, for example, crops and dry matter at a suitable low temperature.

[0002]

2. Description of the Related Art A conventional drying apparatus of this type is shown in FIG. In the drying device 71 shown in the figure, an air conditioning room 74 for dehumidifying air
A storage case cover 73 forming a storage case 72 for the material to be dried is detachably attached to a side of a main body casing 75 forming a storage case. In addition, a ventilation mounting plate 24 made of a punched metal plate or the like is provided in the air blowing port 77 formed below the storage 72 so as to allow ventilation. The storage 72 and the air-conditioning room 74 communicate with each other via an air inlet 77 and an air outlet 78. Container 13 for storing dried object 10
Consists of a rectangular tubular plate 12 having an open upper surface 14 and a lattice-shaped ventilation material 11 provided on the bottom surface of the rectangular tubular plate 12. The object to be dried 10 is stored in the container 13 on the permeable mounting plate 24 in the storage 72.

[0003] As a dehumidifying means of the drying device 71, an air conditioner 81 as shown in FIG.
The air conditioner 81 has a general-purpose refrigerant circuit R and a blower 85 incorporated in a main body casing 84. In the main body casing 84,
A suction port 82 for sucking room air in the air conditioning room 74 into the casing and an air outlet 83 for blowing air after the dehumidification process to the air conditioning room 74 are formed.

As shown in FIG. 10, a refrigerant circuit R includes a compressor 30 that compresses and discharges the refrigerant, a condenser 31 that radiates heat of the refrigerant to the outside air, a throttle valve 32 that depressurizes the refrigerant, An evaporator 33 that cools the use side air by heat exchange with the evaporator 33 is annularly connected via a refrigerant pipe 34. Below the evaporator 33, a drain pan 35 for temporarily storing drain water D generated during dehumidification is provided.
The drain water D collected in the drain pan 35 is discharged to the outside of the machine via the drain pipe 36. According to the drying device 71 having such a configuration, the air dehumidified by the evaporator 33 of the refrigerant circuit R in the air conditioning room 74 is supplied from the air blowing port 77 by the circulation blower 15 disposed in the air conditioning room 74 to the storage 72. The material to be dried 10 is blown into the inside to be dried. The air containing moisture due to the drying of the object to be dried 10 is returned from the air outlet 78 to the air-conditioning chamber 74 again to be dehumidified.

[0005]

However, in the air conditioner 81, not only the evaporator 33 but also the condenser 31 are integrally provided in the main body casing 84.
The condenser 31 is present in the air conditioning room 74 of FIG. Therefore, although the indoor air is deprived of heat when dehumidified by the evaporator 33, the temperature gradually rises not only by receiving heat from the condenser 31 but also by the input loss of the compressor 30 and the circulation blower 15 being added. When the room air temperature rises in this manner, the inside temperature of the storage case 72 also increases accordingly. Incidentally, in the case of summer, the temperature in the storage 72 may be higher than 40 ° C. For this reason, depending on the type of the material to be dried 10, the surface may be discolored or may be deteriorated due to propagation of various bacteria, thereby causing a problem such as impairing the commercial value. Further, only the container 13 is housed in a part of the housing 72 as a space for drying, and the entire inside of the housing is not sufficiently utilized. Further, there is a problem that the unique ventilation structure of the container 13 is not exhibited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has been made in consideration of the above-mentioned conventional problems, and is a cool air drying apparatus which can dry an object to be dried at a desired low and desired temperature in order to maintain good quality. The purpose is to provide.

[0007]

In order to achieve the above object, a cold air drying apparatus according to the present invention comprises a housing for accommodating a material to be dried, a compressor, a condenser, a throttle valve, and an evaporator. An air-conditioning chamber containing at least an evaporator in the refrigerant circuit connected to the air-conditioning chamber, an air inlet for blowing air dehumidified in the air-conditioning chamber into the storage, and returning air from the storage to the air-conditioning chamber. In the drying device, which is communicated with the air outlet of the circulating air passage to form a circulating air passage, and the circulating air blower provided in the circulating air passage is configured to circulate the air, a part of the condenser is exposed to the air conditioning room. The remaining part of the air conditioner is exposed outside the air conditioner, and the indoor blower that blows the indoor air of the air conditioner room toward a part of the condenser exposed to the air conditioner room; Blows outside air toward parts An outside air blower, the interior temperature sensor for detecting the inside temperature of the housing box, the inside temperature detected by the inside temperature sensor as close to the predetermined low temperature temperatures that,
And an air blowing amount control means for controlling the air blowing amount sent from the indoor blower or / and the outside air blower to the condenser.

[0008] In the above structure, the air inlet and the air outlet are respectively provided to penetrate the bottom surface of the storage, and the circulation path in the storage extends outward from the air inlet and upward, and A return path is formed to return downward from the upper end of the return path and communicate with the air outlet, and a permeable mounting plate is laid horizontally in the outward path and the return path so as to allow ventilation, and at least the bottom surface is formed of a ventilation material. Containers for storing the objects to be dried are stacked up and down on the air-permeable mounting plates in the forward path and the return path, and are filled and arranged substantially throughout the forward path and the return path.

Further, in the above structure, the plurality of containers are placed on the air-permeable mounting plate in the storage box so that a vertically penetrating void is formed in the stacked body composed of the plurality of containers stacked in a plurality of vertical stages. While being piled up,
The void portion is used as an outward route or a return route of the circulation air passage.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. However, the same components as those of the conventional drying device 71, air conditioner 81, and refrigerant circuit R shown in FIGS. 8 to 10 are denoted by the same reference numerals, and detailed description thereof may be omitted. Embodiment 1 of the Invention FIG. 1 is a cross-sectional view of a main part showing a cool air drying apparatus according to one embodiment of the present invention. In the figure, a cool air drying device 1 of the first embodiment includes a main body casing 5 forming an air conditioning room 4 for dehumidifying air, a storage case cover 3 detachably mounted on an upper portion of the main body casing 5 and forming a storage case 2. It is provided with. The housing 2 and the air-conditioning room 4 communicate with each other through an air inlet 7 and an air outlet 8 formed through the bottom surface of the housing 2 and the upper surface of the air-conditioning room 4 respectively.

The interior of the storage 2 is partitioned by a partition wall 21 so that an outward path 22 extending upward from the air inlet 7 and a return path 23 returning downward from the upper end of the outward path 22 and communicating with the air outlet 8. Is formed. In the outward path 22 above the air inlet 7 and the return path 23 above the air outlet 8,
Air-permeable mounting plates 24, 24 made of a perforated metal plate, a metal mesh plate, etc., are respectively installed so as to be able to ventilate up and down. That is, a circulating air passage 9 is formed from the air-conditioning room 4, the air blowing port 7, the outward path 22, the return path 23 in the storage 2, and the air outlet 8. A circulation blower 15 is provided in the air-conditioning room 4 near the air inlet 7.

On the other hand, in the refrigerant circuit R described in the prior art, the condenser 31 has an air-conditioning chamber 4 such that a part 31a is exposed inside the air-conditioning chamber 4 and the remaining part 31b is exposed outside the machine.
Is fixedly provided so as to penetrate the bottom plate 6. An indoor blower 16 that blows indoor air of the air-conditioning room 4 toward a part 31 a of the air-conditioning room 4 is provided near the condenser 31 in the air-conditioning room 4. In the vicinity of the condenser 31 outside the machine, for example, three outside air blowers 17, 17, 17 for blowing outside air toward the remaining portion 31b are provided. Inside the housing 2, an inside temperature sensor 19 for detecting the inside temperature is provided. Further, an air volume control means 20 composed of a microcomputer or the like is also provided. The blower amount control means 20 is provided for the indoor blower 16 and the outside air blowers 17, 17, 1
7 is controlled.

Other components provided in the air-conditioning room 4 include, for example, three evaporator blowers 18, 18, which send room air to the evaporator 33 and the throttle valve 32 of the refrigerant circuit R, and the evaporator 33. 18, a drain pan 35 disposed below the evaporator 33. The evaporator 33 is set to have a smaller heat exchange capacity than the condenser 31.
The container 13 includes a rectangular cylindrical plate 12 having an open upper surface 14 (see FIG. 8), and a grid-shaped ventilation material 11 provided at the bottom opening of the rectangular cylindrical plate 12. The containers 13 are stacked on the air-permeable mounting plates 24, 24 in the outward path 22 and the return path 23 in a plurality of upper and lower stages.

Next, the drying process of the object to be dried 10 by the cool air drying apparatus 1 of the first embodiment will be described. Dry matter 1
Here, a case where citrus “Sudachi” is dried is set to 0 as an example. First, a predetermined temperature of the storage 2 (for example, a temperature lower than the outside air temperature at the time of harvesting, and 25 ° C. in the case of immediately harvesting in the summer) is preset in a memory (not shown) of the air blowing amount control means 20. It is remembered. Note that the predetermined temperature of the storage 2 may be manually set by, for example, a dial. Then, when the circulation blower 15 is started,
The air in the air-conditioning room 4 is supplied to the air inlet 7 in the circulation air passage 9, the container 13 in the outward path 22 of the storage 2, and the container 1 in the return path 23.
3 and after passing through the air inlet 8 in order.
Return to and circulate.

Subsequently, when the compressor 30 of the refrigerant circuit R is started, the high-temperature and high-pressure gas refrigerant discharged from the compressor 30 flows into the condenser 31 and exchanges heat with the room air or the outside air to change the state to the medium-temperature high-pressure state. Becomes The refrigerant from the condenser 31 is decompressed by the throttle valve 32 to be in a low temperature and low pressure state. Further, the refrigerant from the throttle valve 32 cools and dehumidifies the indoor air in the evaporator 33, and receives and evaporates itself to become a gas refrigerant and returns to the suction side of the compressor 30. Drain water generated from indoor air by heat exchange with the refrigerant is dropped from the surface of the evaporator 33 and temporarily stored in the drain pan 35. The drain water D collected in the drain pan 35 is discharged to the outside of the machine via the drain pipe 36.

Here, when the inside temperature of the storage 2 detected by the inside temperature sensor 19 is lower than 25 ° C.,
The blowing amount control means 20 activates the indoor blower 16 to blow dehumidified air to a part 31 a of the condenser 31. In the part 31a, the dehumidified air is heated by the high-temperature refrigerant and rises in temperature. The dehumidified air merges with the dehumidified air sent from the evaporator blowers 18, 18, and is then sent into the housing 2. The temperature of the interior of the storage 2 is raised to 25 ° C. by the air sent in this way. Conversely, when the detected inside temperature exceeds 25 ° C., the blower amount control means 20 stops the indoor blower 16 and activates the outside air blower 17 to blow outside air to the remaining portion 31 b of the condenser 31. Then, the heat in the refrigerant circuit R is released to the outside air. As a result, the dehumidified air having a relatively low temperature is sent into the storage 2, and the temperature in the storage 2 is lowered to approach 25 ° C. In this case, the outside air blowers 17, 17,
The number of starters 17 is determined according to the temperature difference between the set temperature (here, 25 ° C.) and the internal temperature.

The amount of air blown to the condenser 31 is controlled by simultaneously driving the indoor blower 16 and the outdoor air blower 17, the indoor blower 16 or the outdoor air blower 1 or the like.
7 and a drive that changes the number of operating indoor blowers 16 and outside air blowers 17, 17, and 17, and an inverter that controls the motor rotation speed of the indoor blower 16 or the outside air blower 17 and the like.

As described above, the low-temperature dehumidified air sent into the storage 2 removes moisture from the surface of the dried product (the object 10 to be dried) when passing through the container 13 and is dried by about 7%. During the drying process, the internal temperature is approximately 25 ° C.
, The color of the epidermis is kept the same high green value as when harvested. Then, the refrigerant circuit R
When the temperature is kept at, for example, 5 ° C. by making use of the refrigerating capacity of the product, it can be stored for a long term without losing the quality for shipment in New Year. By the way, when dried at 40 ° C. with dehumidified air, the epidermis of the corn was turned yellow and was not for sale.

Therefore, according to the cold air drying apparatus 1, since the dehumidified low-temperature cold air is immediately supplied, the dust can be sufficiently dried efficiently without discoloration or deterioration. In addition, a plurality of containers 1
Are filled and arranged almost entirely in the outward path 22 and the return path 23 in a state in which the staples are housed, so that the entire inside of the housing 2 can be used. In addition, like the outbound route 22 and the return route 23,
Since the air is reciprocated in the storage 2, the air can be ventilated at a remarkably high wind speed as compared with the related art, so that the dries can be efficiently and quickly dried. In addition, it is also possible to drive the circulation blower 15 in the reverse direction to blow the inside of the circulation air passage 9 in the opposite direction (the direction opposite to the solid line arrow in the figure). By driving the circulating blower 15 in the reverse direction, the wind flows in the circulating air passage 9 in the reverse direction, so that the drying is uniformly performed over the entire storage 2.

Other examples of the material to be dried 10 include, for example, flat seedless persimmon, anpan persimmon, mandarin orange, and fine noodles. In this case, about 15 ℃ for persimmon without persimmon
It is sufficient to dry the raindrops and morning dew on the epidermis with the dehumidified air. As a result, it is possible to prevent the occurrence of black spots that impair the commercial value during the decontamination processing. Dried persimmon persimmon is dried at about 15 ° C with dehumidified air at about 37%. By the way, when the persimmon persimmon is dried at 40 ° C., various bacteria grow and the pulp deteriorates. On the other hand, oranges harvested in autumn are dried by about 5% with dehumidified air at 15 ° C. (a temperature lower than the average temperature at the time of harvest). On the other hand, in the case of fine noodles, 15
What is necessary is just to dry moderately with dehumidification air of ° C.

Embodiment 2 of the Invention As shown in FIGS. 2 and 3, the cool air drying device 1 a according to the second embodiment has almost the same configuration as the cool air drying device 1 of the first embodiment. The cold air drying device 1a is different from the cold air drying device 1 in configuration in that the partition wall 21 (FIG. 1) is not provided in the storage 2 and the circulation blower 15a is arranged substantially in the center of the air conditioning room 4 in plan view. The stack 25 comprising the container 13
Are stacked on the air-permeable mounting plate 24 in the storage 2 so as to form a gap portion 26 vertically penetrating the container 2.

FIG. 3 shows a plan layout of containers 13, 13, 13,... Stacked on the air-permeable mounting plate 24. The plane arrangement of the container 13 is the same as the pallet stacking arrangement of containers recommended by JA (Japan Agricultural Cooperative Association). By stacking the containers 13 in this manner, a rectangular cylindrical gap portion 26 is formed at a substantially central portion of the stacked body 25 in plan view.

In this embodiment, the outlet of the circulating blower 15a is the air inlet 7a. On the other hand, the air outlets 8a, 8a are located below the air-permeable mounting plate 24 arranged around the air inlet 7a. Thus, a circulating air passage 9a including the air-conditioning room 4, the air inlet 7a, the gap 26, the storage 2, the container 13, and the air outlet 8a is formed. Therefore, the gap 26 becomes the outward path of the circulation air passage 9a, and the rectangular tubular plate 1
The interior space 27 of the container formed in a chimney shape by 2, 12,... Becomes the return route of the circulation air passage 9a.

According to the cool air drying apparatus 1a having the above-described configuration, the gap 26 can be used as the outward path of the circulation air path 9a. This eliminates the need for the partition wall 21 for forming the outward path 22 and the return path 23 as in the first embodiment (see FIG. 1), and the structure of the storage 2 is further simplified. Here, the gap 26 is used as the outward path of the circulation air path 9a, and the container interior space 27 is used as the return path. However, the circulation blower 15a is driven to rotate in the reverse direction (2 in FIG. 2).
By blowing air in the direction indicated by the dashed-dotted arrow), it is possible to use the space 27 inside the container as an outward route and use the gap 26 as a return route.

Embodiment 3 of the Invention As shown in FIGS. 4 and 5, the cool air drying device 1 b according to the third embodiment has substantially the same configuration as the cool air drying devices 1 and 1 a of the first and second embodiments. Then, the cold-air drying device 1b is connected to the cold-air drying devices 1, 1
The main difference from the first embodiment is that the evaporator ventilation passage 40 is separated by a partition wall 46 and guides room air to the evaporator 33.
A dehumidifying air passage 29 is provided for communicating the air with the suction side of the air blower 15 of the air-conditioning chamber 4; Air passage 29a communicating with the suction side of the air blower 15 is provided, and the remaining portion 31b of the condenser 31 is exposed between the partition wall 47 partitioning the inside of the air conditioning room 4 and the bottom plate 6a. The air passage 28 for the condenser in which the blowers 17, 17, 17 are provided is formed. Alternatively, an opening / closing lid 42 for switching to the ventilation passage 28 for the condenser or taking in the outside air into the ventilation passage 28 for the condenser is provided. The rest of 31 The air passage of the air passing through the 1b, is that the circulating blower 15 the suction side or lid 44 to switch to the outside of the air conditioning chamber 4 is provided.

In the cool air drying apparatus 1b of the third embodiment, during the dehumidifying operation, the open / close
Both the openings 2 and 44 are engaged with the bottom plate 6a to close the two openings communicating the condenser ventilation passage 28 with the outside of the machine. At this time, an opening communicating the dehumidified air ventilation passage 29 and the ventilation passage 28 for the condenser, and the ventilation passage 28 for the condenser and the circulation fan 1
5 An opening communicating with the suction side is opened. Therefore, when the inside of the housing 2 is too cold, if the dehumidifying operation is performed, the temperature inside the housing can be raised to a predetermined set temperature while dehumidifying. On the other hand, at the time of the cooling operation, both the open / close lids 42 and 44 are engaged with the partition wall 47 as shown by the solid lines, and the opening communicating the dehumidified air ventilation passage 29 and the condenser ventilation passage 28, and the condenser ventilation passage 28 The opening that communicates with the circulation blower 15 and the suction side is closed. At this time,
Two openings of the bottom plate 6a that communicate the condenser ventilation passage 28 with the outside of the machine are opened. As a result, most of the heat from the condenser 31 is radiated to the outside air, so that the air blown out from the outlet 45 of the circulation blower 15 to the air inlet 7 becomes dehumidified cold air in the storage 2. It is used for dehumidifying cooling.

The means for adjusting the amount of air blown to the condenser 31 in order to control the temperature of the storage 2 is not limited to the above embodiments. For example, as shown in FIG. 6, by providing a partition wall 51 and a partition wall 52 on both sides of the bottom plate 6, an external air passage communicating with the outside of the machine is formed between the bottom plate 6 and the partition wall 52, and the bottom plate 6 and the partition wall 51 are formed. An indoor air passage communicating with the inside of the air-conditioning room 4 is formed therebetween. The condenser 31 is provided to penetrate the partition 51, the bottom plate 6, and the partition 52 so as to be exposed to the outside air passage and the indoor air passage. Outside air blowers 17 and 17 are provided in the outside air passage, and indoor blowers 16 and 16 are provided in the indoor air passage. According to the blower amount adjusting means, the outside air blower 17, 1
The temperature in the storage 2 can be adjusted by adjusting the amount of air blown to the outside air ventilation path and the amount of air blown to the indoor air ventilation path by changing the driving number of the indoor blowers 7 or the indoor blowers 16, 16.

In the air volume adjusting means shown in FIG. 7, the condenser 31 is provided through the partition walls 53 and 54 arranged in parallel so that the condenser 31 is exposed to the outside air passage and the room air passage. . Outside air blowers 17 and 17 are provided in an outside air ventilation path outside the partition wall 54, and an indoor blower 16 is provided in an indoor air ventilation path inside the partition wall 53, and inter-wall ventilation between the partition wall 53 and the partition wall 54 is provided. A switching blower 57 is provided on the road. Further, a pivot shaft 5 is provided at a position slightly apart from the distal ends of the partition walls 53 and 54 and at the distal end of the bottom plate 6.
An opening / closing lid 56 swinging around 5 is provided. The opening / closing lid 56 is engaged with the tip of the partition wall 53 or the tip of the partition wall 54 so as to switchably connect the inter-wall ventilation path to either the outside air ventilation path or the indoor air ventilation path. The amount of air blown to the outside air passage and the amount of air blown to the room air passage are also adjusted by this airflow amount adjusting means, and the temperature in the storage 2 is controlled.

[0029]

As described above, according to the cold-air drying apparatus of the present invention, the dehumidified low-temperature cold air is supplied to the object to be dried, so that the object to be dried can be sufficiently dried without discoloration or deterioration. Can be dried.

Further, since the containers accommodating the objects to be dried are stacked up and down on the air permeable mounting plates in the forward path and the return path, and are filled and arranged substantially throughout the forward path and the return path. The object to be dried can be efficiently and quickly dried using the whole of the storage.

Since a plurality of containers are stacked up and down on the air-permeable mounting plate so as to form a space vertically penetrating the stacked body of the containers, the space is formed in the forward or backward path of the circulation air path. Can be used as
Thereby, for example, a partition wall or the like for forming the outward path or the return path is not required, and the structure of the storage is further simplified.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a cool air drying device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part showing a cool air drying device according to another embodiment.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a cross-sectional view illustrating a main part of a cool air drying device according to another embodiment.

FIG. 5 is a sectional view taken along line BB in FIG. 4;

FIG. 6 is an explanatory diagram showing a mechanism for adjusting the amount of air blown to the condenser.

FIG. 7 is an explanatory diagram showing another mechanism for adjusting the amount of air blown to the condenser.

FIG. 8 is a sectional view of a main part showing a conventional drying device.

FIG. 9 is a cross-sectional view of a main part showing an air conditioner used in a conventional drying device.

FIG. 10 is a schematic configuration diagram showing a general refrigerant circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a, 1b Cold air dryer 2 Storage 4 Air-conditioning room 7, 7a Air inlet 8, 8a Air outlet 9, 9a Circulating air path 10 Dried material 11 Vent material 13 Container 15, 15a Circulating blower 16 Indoor blower REFERENCE SIGNS LIST 17 outside air blower 18 blower for evaporator 19 internal temperature sensor 20 air flow control means 22 outgoing path 23 return path 24 air-permeable mounting plate 25 stacked body 26 void portion 27 container space 30 compressor 31 condenser 31a part 31b remaining part 32 aperture Valve 33 Evaporator R Refrigerant circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiaki Yamaguchi 6-5-66 Tehira, Wakayama-shi, Wakayama Washi Technica Co., Ltd. (72) Koji Kishi Inventor 2-6-1 Otemachi, Chiyoda-ku, Tokyo No. Mitsubishi Electric Engineering Co., Ltd. F-term (reference) 3L113 AA01 AB02 AC21 AC67 BA17 BA18 CA04 CB13 DA09 DA10 DA13

Claims (3)

[Claims] 1. A storage for storing an object to be dried, a compressor,
At least an air-conditioning chamber containing the evaporator in a refrigerant circuit formed by annularly connecting a condenser, a throttle valve, and an evaporator is used to blow air dehumidified in the air-conditioning chamber into the storage. A mouth and an air outlet for returning air from the storage to the air-conditioning chamber form a circulating air passage, and circulating air is blown by a circulating blower provided in the circulating air passage. In the configured drying device, the condenser is provided in a state where a part of the condenser is exposed to the air-conditioned room and the remaining part is exposed to the outside of the air conditioner. An indoor blower that blows indoor air of the room, an outside air blower that blows outside air toward the remaining portion of the condenser exposed outside the machine, an internal temperature sensor that detects an internal temperature of the storage, Internal temperature Air flow control means for controlling the air flow sent from the indoor blower or / and the outside air blower to the condenser so that the internal temperature detected by the sensor approaches the predetermined low temperature. Characteristic cold air dryer. 2. An air outlet and an air outlet are respectively provided to penetrate the bottom surface of the storage, and as a circulation air passage in the storage, an outward path extending upward from the air inlet, and an upper end of the outward path. A return path is formed to return downward and communicate with the air outlet, and a gas-permeable mounting plate is provided horizontally in the forward path and the return path so as to allow ventilation, and at least the bottom surface is formed of a ventilation material. Containers that store the objects to be dried are vertically stacked on the air-permeable mounting plate in the forward path and the return path, and are filled and arranged substantially throughout the forward path and the return path. The cold-air drying device according to claim 1, wherein: 3. A plurality of containers are stacked on a gas-permeable mounting plate in a storage so as to form a gap vertically penetrating a stacked body composed of a plurality of containers stacked in upper and lower stages. The cool air drying device according to claim 2, wherein the gap is used as a forward path or a return path of a circulation air path.