JP6069271B2 - Defroster - Google Patents

Description

  The present invention relates to a thawing device, and more particularly, to a thawing device for thawing an object to be thawed in a frozen state in a thawing chamber.

Conventionally, various thawing methods have been used when thawing an object to be thawed in a frozen state, for example, a frozen block meat in a thawing chamber.
Specifically, air thawing method that defrosts by blowing warm air or wet air, natural thawing method that is allowed to stand at room temperature or low temperature, water thawing method that defrosts using water such as immersion thawing or sprinkling thawing And a heating and thawing method for thawing by high frequency induction heating.

Among these thawing methods, the air-flow thawing method and the natural thawing method do not require complicated equipment and are particularly suitable for thawing a large amount of frozen block meat, but usually one day for the thawing time of the frozen block meat As a result, problems such as a decrease in flavor and freshness have occurred.
For this reason, various ideas as in Patent Document 1 are being made.

The thawing device described in Patent Document 1 is a device for thawing frozen blocks such as fish in a thawing chamber using an airflow thawing method.
The thawing apparatus includes a thawing chamber in which a plurality of moving shelves on which refrigeration blocks are placed, a heating heater installed in the upper part of the thawing chamber, and a refrigerator indoor fan that cools the room. It mainly includes a forward blower and a reverse blower that circulate hot air.
Moreover, it comprises air direction control means for alternately switching the blowers to blow air, and control means for alternately switching between the heater and the refrigerator indoor fan to bring the room temperature closer to the set temperature.
With the above configuration, when the thawing chamber is viewed from the side, the warm air in the thawing chamber can be rotated in the vertical direction and circulated, and the temperature of the entire chamber can be kept relatively equal. Moreover, it is possible to adjust the room temperature and the indoor wind speed suitable for the thawing of the thawing block.
Therefore, a large number of frozen blocks can be thawed relatively equally, and the thawing time of the frozen blocks can be shortened. In addition, thawing can be performed so that there is no relatively uneven thawing between the surface and the inside of the frozen block.

JP 2005-295816 A

However, in the thawing device as in Patent Document 1, in order to circulate the warm air in the thawing chamber, a large number of heaters, blowers, and refrigerator indoor fans are installed, and the configuration is complicated.
In addition, since all of the heater, the blower, and the refrigerator indoor fan are installed in the upper part of the thawing chamber, the arrangement is not such that the warm air in the thawing chamber easily rotates and circulates in the vertical direction. That is, there is a possibility that hot air hits the heat insulation wall constituting the thawing chamber, and there is a risk that hot air (warm air) will rise higher than cold air (cold air). However, it was not arranged to circulate hot air efficiently.

  Furthermore, when the hot air in the thawing chamber is rotated in the vertical direction and circulated, the upper refrigeration block with which the hot air first comes into contact is thawed quickly, while the lower refrigeration block is thawed with a delay. There is a possibility that unevenness of thawing occurs between the upper and lower frozen blocks, resulting in a decrease in quality.

The present invention has been made in view of the above problems, and an object of the present invention is to circulate the hot air in the thawing chamber uniformly and to thaw the material to be thawed evenly without requiring complicated equipment. An object of the present invention is to provide a decompression device capable of performing the above.
Another object of the present invention is to provide a thawing device capable of thawing by shortening the thawing time without degrading the flavor and freshness of the thawing material while thawing a plurality of the thawing materials evenly. is there.

According to the thawing device of the present invention, the subject is a thawing device for thawing an object to be thawed in a frozen state, provided in a thawing chamber partitioned by a heat insulating wall and a central portion of the thawing chamber. A hot air blower for blowing warm air into the thawing chamber, and at least three or more warm air blown from the hot air circulator are provided in the thawing chamber so as to circulate in the thawing chamber. A circulation fan and a plurality of mounting shelves that are provided at a predetermined position in the thawing chamber and that are capable of placing a plurality of the objects to be thawed at intervals in the vertical direction, the warm air fan and the circulation fan, It is arranged at an upper position in the thawing chamber, the mounting shelf is arranged at a lower position than the warm air fan and the circulation fan, and each circulation fan is provided at substantially the same height position. is, circular circumferential smell it around said air heater Spaced sucks warm air blown out from one said circulation fan adjacent in the circumferential direction, and is disposed to blow toward the other of the circulation fan adjacent the hot air sucked , the warm air in the horizontal direction Ru to circulate the circumferential direction in hot air to rotate, is solved by.

As described above, at least three or more circulation fans are provided at height positions corresponding to each other, arranged at intervals in a substantially circumferential direction centering on the hot air heater, and arranged in one direction in the circumferential direction. Since the hot air is installed to circulate, the hot air in the thawing chamber can be circulated uniformly with a relatively simple configuration.
Specifically, since each circulation fan is arranged at an interval in a substantially circumferential direction centering on the hot air heater, the warm air blown out from the hot air fan passes through each circulation fan. The possibility of circulating around the thawing chamber efficiently and hitting the heat insulation wall and other components of the thawing chamber is reduced.
Moreover, since the warm air is rotated and circulated in the horizontal direction when the thawing chamber is viewed from directly above, the warm air in the thawing chamber can be efficiently and uniformly circulated as compared with the conventional configuration.
Specifically, when hot air is rotated and circulated in the horizontal direction as in this configuration, even if a phenomenon in which hot air (warm air) rises higher than cold air (cold air) occurs, Since it is gradually filled from the upper side to the lower side, the horizontal rotation of the hot air by the circulation fan and the phenomenon in which the hot air rises higher than the cold air do not interfere with each other.
Furthermore, with the above-described configuration, it is possible to eliminate the thawing unevenness that has occurred between the upper and lower objects in the conventional method of rotating warm air in the vertical direction.
Specifically, since the warm air is rotated and circulated in the horizontal direction, the thawing unevenness does not occur between the objects to be thawed placed on the placement shelf with an interval in the vertical direction. In particular, since the thawed material to be thawed is generally taken in and out from the thawing chamber for each mounting shelf, it is important that no thawing unevenness occurs between the thawed materials placed on one mounting shelf. However, the method of rotating and circulating hot air by the present thawing device is very meaningful because there is a low possibility that thawing unevenness occurs between objects to be thawed placed on one placement shelf.
Therefore, a plurality of products to be thawed can be thawed evenly, and a thawing device capable of thawing by shortening the thawing time without reducing the flavor and freshness of the materials to be thawed is obtained.

At this time, each said circulation fan, prior Symbol circumferential direction is arranged substantially equidistant, may be installed to blow hot air in one direction of the circumferential direction.
With the above configuration, the warm air in the thawing chamber can be circulated more uniformly while rotating in the horizontal direction.

At this time , the said mounting shelf is good to be arrange | positioned in the downward position which left the predetermined space rather than the said warm air fan and the said circulation fan.
By the said structure, the mounting shelf in which the to-be-thawed object was mounted in multiple numbers can be efficiently put in or out of the thawing room.
Moreover, since the mounting shelf is disposed at a lower position with a predetermined interval than the hot air heater and the circulation fan, the warm air gradually becomes uniform temperature while rotating horizontally on the ceiling side in the thawing chamber. Since it descends toward the mounting shelf, it is possible to defrost a plurality of objects to be thawed more evenly.

At this time, it is preferable that the thawing chamber has a substantially square horizontal cross-sectional shape, and at least four circulation fans are provided in the thawing chamber.
With the above configuration, the warm air in the thawing chamber can be circulated more uniformly, and a plurality of objects to be thawed can be thawed more evenly.

At this time, the thawing chamber is configured to connect at least two rooms having a substantially square horizontal cross-sectional shape and form a continuous internal space in which adjacent surfaces of the rooms are open surfaces. It is preferable that the warm air heater and a plurality of circulation fans surrounding the warm air heater are installed for each room.
With the above configuration, even when the thawing chamber is enlarged, the hot air in the thawing chamber can be circulated while rotating in the horizontal direction in each room so that the hot air in the thawing chamber can be circulated uniformly. Thaw things evenly.

At this time, the hot air heater and the plurality of circulation fans are installed so as to circulate the hot air in one circumferential direction for each of the rooms constituting the thawing chamber, It is good to be comprised so that the circulation direction of the warm air which circulates in the room may be opposite to each other.
With the above configuration, it is possible to reduce the collision and interference between hot air that is rotating and circulating independently in two adjacent rooms, so that the hot air in the thawing chamber is circulated more uniformly for each room. Can be made.

At this time, the hot air heaters installed in the two adjacent rooms may be installed so as to blow the hot air in different directions.
With the above-described configuration, it is possible to further reduce the collision between the hot airs rotating and circulating in two adjacent rooms and colliding with each other.

According to the thawing device of the present invention, it is possible to provide a thawing device capable of uniformly thawing an object to be thawed by uniformly circulating hot air in the thawing chamber without requiring complicated equipment.
In addition, it is possible to provide a thawing apparatus that can defrost a plurality of products to be thawed evenly while shortening the thawing time without reducing the flavor and freshness of the products to be thawed.

It is a perspective view explaining the decompression | decompression apparatus of this embodiment. It is a top view of a thawing | decompression apparatus, and is a figure explaining arrangement | positioning of a warm air fan and a circulation fan. It is a top view of a thawing | decompression apparatus, and is a figure explaining arrangement | positioning of a mounting shelf. It is a side view of a decompression device. It is a top view of the decompression | decompression apparatus which concerns on 2nd Embodiment. It is a side view of the decompression | decompression apparatus which concerns on 2nd Embodiment. It is a top view of the decompression | decompression apparatus which concerns on 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
The present embodiment is a thawing device for thawing an object to be thawed, which is a thawing chamber having a horizontal cross-sectional square shape, a single warmer installed in the central portion of the thawing chamber, and warm air in the thawing chamber. 4 are installed at positions surrounding the vessel, and are provided with a circulation fan that circulates the hot air blown out from the hot air heater into the thawing chamber, and a plurality of placement shelves on which the object to be thawed can be placed, The circulation fans are provided at substantially the same height, are arranged at predetermined intervals in the circumferential direction around the warm air heater, and are installed so as to circulate the warm air in one direction of the circumferential direction. The present invention relates to an invention of a decompression device.
In the thawing chamber, the direction in which an operator enters and exits from the door provided on the side wall surface of the thawing chamber is the front-rear direction, and the width direction orthogonal to the front-rear direction in the thawing chamber is the left-right direction.

As shown in FIG. 1, the thawing device S of the present embodiment is a device for thawing an object to be thawed in a frozen state, for example, a frozen block meat, using an airflow thawing method.
The thawing device S is installed in a thawing chamber 1 partitioned by a heat insulating wall, a central portion of the thawing chamber 1 in the front-rear direction and the left-right direction, and a hot air blower 10 for blowing warm air into the thawing chamber 1; A circulation fan 20 that is provided at substantially the same height in 1, is installed at a position surrounding the warm air heater 10, and circulates the warm air blown from the warm air heater 10 into the thawing chamber 1, and the thawing chamber 1. A plurality of placement shelves 30 that are installed at predetermined positions in the inside and are capable of placing a plurality of objects to be thawed at intervals in the vertical direction are mainly provided.

As shown in FIG. 1, the thawing chamber 1 is formed of a substantially rectangular parallelepiped having a substantially square horizontal cross section, and is formed as a chamber partitioned by a heat insulating wall plate.
An entrance door 2 and an exit door for entering and leaving the racks 30 on which a plurality of articles to be thawed are placed in and out of the both sides 1b and 1c in the front-rear direction of the thawing chamber 1 3 are installed.

As shown in FIG. 1, the hot air heater 10 is a ceiling-suspended electric heating fan heater for adjusting the room temperature as air conditioning equipment in the thawing chamber 1, and a ceiling wall that is an upper portion in the thawing chamber 1 It is installed on the bottom of the part 1a. Further, as shown in FIG. 2, the warm air heater 10 is disposed in a substantially central portion in the thawing chamber 1 when viewed from directly above.
More specifically, the warm air heater 10 is arranged in the thawing chamber 1 so as to blow warm air toward the side wall 1d on one side in the left-right direction. That is, warm air is blown out toward a wall portion different from the side wall portions 1b and 1c where the entrance door 2 and the exit door 3 are installed.
A known refrigerator is installed outside the thawing chamber 1, and the hot air heater 10 and the refrigerator are connected by a refrigerant pipe through an opening (not shown) provided in the ceiling wall 1a.

As shown in FIGS. 1 and 2, the circulation fan 20 is a ceiling-suspended air circulation fan for circulating hot air into the thawing chamber 1 as air conditioning equipment in the thawing chamber 1. Four are installed in the position which surrounds the warm air heater 10 in the bottom face of the ceiling wall part 1a.
Each circulation fan 20 is disposed at substantially the same height, is disposed at a predetermined interval in a substantially circumferential direction centered on the hot air heater 10, and circulates warm air in one direction in the circumferential direction. It is installed to let you.

More specifically, the circulation fan 20a is installed on the side wall 1b side where the entrance door 2 is provided in the front-rear direction, and on the side wall 1d side on the side where the warm air blower 10 blows warm air in the left-right direction. . And it arrange | positions so that a warm air may be blown out toward the side wall part 1c side in which the exit door 3 was provided in the front-back direction, ie, the circulation fan 20b.
The circulation fan 20b is arranged so as to suck in the warm air blown out from the circulation fan 20a and blow out the sucked warm air in the left-right direction toward the side wall portion 1e, that is, toward the circulation fan 20c.
Similarly, the circulation fan 20c is arranged to suck in the warm air blown from the circulation fan 20b and blow out the warm air toward the circulation fan 20d. The circulation fan 20d is warm air blown from the circulation fan 20c. Are arranged so that warm air is blown out toward the circulation fan 20a.

In other words, each circulation fan 20 is arranged to suck in the warm air blown out from one adjacent circulation fan 20 and blow out the sucked warm air toward the other circulation fan 20 adjacent thereto.
With the above configuration, the hot air blown from the warm air fan 10 when viewed from directly above can be circulated so as to rotate in the horizontal direction, that is, rotate clockwise.

As shown in FIGS. 1 and 3, the mounting shelf 30 is formed of a known erector capable of mounting a plurality of objects to be thawed in the vertical direction with a predetermined interval on the floor wall 1 f in the thawing chamber 1. It is installed so that it may become the arrangement position of.
As shown in FIG. 4, the mounting shelf 30 is disposed at a lower position at a predetermined interval than the warm air fan 10 and the circulation fan 20.
Although the placement shelf 30 may be arranged arbitrarily, it is desirable that the placement shelf 30 is disposed so as to avoid the position directly below the warm air heater 10 and the peripheral positions of the entrance door 2 and the exit door 3.

In the above configuration, each circulation fan 20 in the thawing chamber 1 is arranged at a predetermined interval in a substantially circumferential direction centering on the warm air heater 10 and circulates the warm air in one direction in the circumferential direction. It is installed to let you.
Therefore, the hot air blown out from the warm air heater 10 circulates around each circulation fan 20 so as to efficiently circulate in the thawing chamber 1 and rebounds upon hitting the heat insulating wall and other components of the thawing chamber 1. The risk of endangering is reduced.

Further, in the above configuration, each circulation fan 20 in the thawing chamber 1 is arranged so as to circulate by rotating the hot air in the horizontal direction when the interior of the thawing chamber 1 is viewed from directly above.
Therefore, even if a natural phenomenon occurs in which warm air (warm air) rises higher than cold air (cold air), the warm air from the warm air is gradually filled from the upper side to the lower side in the thawing chamber 1. Interference between the horizontal rotation of the hot air by the circulation fan and the natural phenomenon in which the hot air rises higher than the cold air is reduced.
At this time, the mounting shelf 30 on which the object to be thawed is placed at a position below the warm air fan 10 and the circulation fan 20 at a predetermined interval, so that it rotates horizontally on the ceiling side in the thawing chamber 1. However, the warm air that has gradually become uniform temperature descends toward the mounting shelf 30.

Further, in the above configuration, a plurality of objects to be thawed are arranged on the placement shelf 30 at intervals in the vertical direction and the horizontal direction.
Therefore, when the warm air circulates in the entire thawing chamber 1, the possibility that the plurality of mounting shelves 30 on which the objects to be thawed have an influence on the circulation direction of the warm air is reduced.

In the above-described configuration, the entire room is suitable for thawing the object to be thawed by adjusting the set temperature and set air speed of the warm air heater 10 and the set air speed of the circulation fan 20 according to the size and shape of the object to be thawed. The room temperature and room wind speed are kept uniform.
Therefore, a large amount of the material to be thawed can be thawed evenly, and the thawing time of the material to be thawed can be shortened. In addition, thawing can be performed with relatively little thawing unevenness between the surface and the inside of the frozen block.

<Second Embodiment of Defroster>
Next, a second embodiment of the decompression device will be described with reference to FIGS.
In addition, in the following description, the description which overlaps with the decompression | decompression apparatus mentioned above is abbreviate | omitted.
The thawing device S according to the second embodiment is provided at a height position corresponding to each other in the thawing chamber 101, the warm air heater 110 installed in the central portion of the thawing chamber 101, and the thawing chamber 1. A plurality of circulation fans 120 installed at positions surrounding the vessel 110 and a plurality of mounting shelves 130 installed at predetermined positions in the thawing chamber 101 are mainly provided.

As shown in FIG. 5, the thawing chamber 101 is configured such that two rooms made of rectangular parallelepipeds having a horizontal cross section are connected to each other, and a continuous internal space is formed with the adjacent surfaces of the rooms being open surfaces. Has been.
An entrance door 102 and an exit door 103 are installed on the side wall 101b of one room of the thawing chamber 101 and the side wall 101c of the other room.
In the thawing chamber 101, a warm air heater 110 and a plurality of circulation fans 120 surrounding the warm air heater 110 are installed for each room.

The warm air heater 110 is installed on the bottom surface of the ceiling wall portion 101a for each room in the thawing chamber 101, and is disposed at the center portion when viewed from directly above.
Moreover, the warm air heater 110 installed in each of the two adjacent rooms is installed so as to blow the warm air in different directions.

The circulation fans 120 are installed on the bottom surface of the ceiling wall portion 101a for each room in the thawing chamber 101, and four circulation fans 120 are arranged at positions surrounding the warm air heater 110.
And as shown in FIG. 6, each circulation fan 120a-120d is arrange | positioned so that a height position may become low in order, respectively.
More specifically, two adjacent circulation fans 120 are disposed at positions where at least a part thereof overlaps in the vertical direction, and the circulation fan 120 on the upstream side of the circulating hot air is disposed on the downstream side. It is arranged at a position slightly higher than 120.
For example, the circulation fans 120a and 120b are arranged at positions where a part thereof overlaps in the vertical direction, and the circulation fan 120a is arranged at a position slightly higher than the circulation fan 120b.

  The mounting shelf 130 is installed on the floor wall portion 101f in the thawing chamber 101 so as to have a predetermined arrangement position, and is disposed at a lower position with a predetermined interval from the hot air heater 110 and the circulation fan 120. .

In the above configuration, the warm air heater 110 and the plurality of circulation fans 120 are installed so as to circulate the warm air in one circumferential direction for each room that is a constituent element of the thawing chamber 101 and are adjacent to each other. It arrange | positions so that the circulation direction of the warm air which circulates through the inside of two rooms may become the mutually opposite direction.
Therefore, it is possible to reduce the collision between the hot airs that are rotating and circulating independently in the two adjacent rooms and interfere with each other, and the hot air in the thawing chamber 101 is made more uniform for each room. It can be circulated.

Moreover, in the said structure, each circulation fan 120a-120d is arrange | positioned so that a height position may become low in order, respectively.
Therefore, the warm air blown out from the warm air heater 110 in each room is circulated while rotating in a substantially spiral shape from the upper side to the lower side by the circulation fan 120, and the hot air is circulated in the thawing chamber 101. Can be circulated uniformly and in a relatively short time.

<Third embodiment of decompression device>
Next, a third embodiment of the decompression device will be described with reference to FIG.
In the thawing device S according to the third embodiment, the thawing chamber 201 connects two rooms made of rectangular parallelepipeds having a horizontal cross section, and forms a continuous internal space in which the adjacent surfaces of the rooms are open surfaces. Is configured to do.

The warm air heater 210 is disposed in the central portion for each room in the thawing chamber 101.
Moreover, the warm air heater 210 installed in each of two adjacent rooms is installed so as to blow the warm air in different directions.
In the thawing chamber 201, six circulation fans 220 are arranged in a position surrounding the hot air heater 210 in one room, and three circulation fans 220 are arranged in a position surrounding the hot air heater 210 in the other room.
As described above, by arranging six circulation fans 220 in one room of the thawing chamber 201, the warm air in the room circulates more evenly. In addition, by arranging three circulation fans 220 in the other room, the hot air in the room circulates relatively evenly while suppressing the equipment cost.

<Other embodiments>
In the above embodiment, as shown in FIG. 1, the thawing chamber 1 is formed of a substantially rectangular parallelepiped having a substantially square horizontal cross section. However, the present invention is not limited thereto, and the horizontal cross section may be substantially rectangular. A circular shape, a substantially elliptical shape, etc. may be sufficient. Moreover, it is not limited to a substantially rectangular parallelepiped, but may be a substantially cone, a substantially cylinder, a substantially sphere, a substantially pyramid, a substantially prism, or the like.

Moreover, in the said embodiment, as shown in FIG. 2, although the four circulation fans 20 are installed in the position which surrounds the warm air heater 10 in the thawing chamber 1, it is not limited to this, At least 3 or more It only has to be installed.
With such a configuration, the warm air in the thawing chamber 1 can be uniformly circulated in the horizontal direction.

Moreover, in the said embodiment, as shown in FIG. 2, each circulation fan 20 is arrange | positioned at predetermined intervals in the substantially circumferential direction centering on the warm air heater 10. FIG.
In the meaning of the above arrangement, each circulation fan 20 does not necessarily have to be arranged at an equal distance from the warm air fan 10. For example, the distance between the circulation fan 20 a and the warm air heater 10 is determined by the circulation. The distance between the fan 20b and the warm air heater 10 may be slightly shorter or slightly longer.
That is, if each circulation fan 20 is arranged around the warm air heater 10, the positional relationship between the circulation fans 20 is allowed to be shifted.

  Moreover, in the said embodiment, as shown in FIG. 2, although each circulation fan 20 is arrange | positioned at fixed intervals, it is not limited to this, The space | interval of circulation fans 20 is changed suitably. Also good.

  Moreover, in the said embodiment, as shown in FIG. 3, although the warm air heater 10 and the circulation fan 20 are installed in the ceiling wall part 1a bottom face which becomes an upper part in the thawing room 1, it is limited to this. Instead, it may be installed at a substantially central portion in the up-down direction, or may be installed on the floor wall portion 1f as a lower portion.

In the present embodiment, the thawing device according to the present invention has been mainly described.
However, said embodiment is only an example for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.
In particular, the arrangement and configuration of the thawing chamber 1, the warm air heater 10, and the circulation fan 20 described in the above embodiment are merely examples, and do not limit the present invention.

S Defroster 1, 101, 201 Defroster 1a, 101a Ceiling wall 1b, 1c, 1d, 1e, 101b, 101c Side wall 1f, 101f Floor wall 2 Inlet door 3 Outlet door 10, 110, 210 Hot air heater 20 , 120, 220 Circulating fans 20a, 20b, 20c, 20d Circulating fans 120a, 120b, 120c, 120d Circulating fans 30, 130 Mounting shelf

Claims (7)

A thawing device for thawing an object to be thawed in a frozen state,
A thawing chamber partitioned by an insulating wall;
A hot air blower that is provided in a central portion of the thawing chamber and blows out hot air into the thawing chamber;
At least three or more provided in a position surrounding the warm air in the thawing chamber, and circulating fans for circulating the warm air blown from the warm air in the thawing chamber,
A plurality of placement shelves provided at a predetermined position in the thawing chamber, and capable of placing a plurality of the thawing objects at intervals in the vertical direction,
The hot air heater and the circulation fan are arranged at an upper position in the thawing chamber,
The mounting shelf is disposed at a lower position than the hot air fan and the circulation fan,
Each said circulation fan is provided substantially at the same height, the spaced apart in circular circumferential direction you around the air heater, blown from one said circulation fan adjacent in the circumferential direction The hot air is sucked in, and the sucked warm air is installed to blow out toward the other circulating fan adjacent to the hot air, and the hot air is warmed in one direction in the circumferential direction so that the hot air rotates horizontally. thawing and wherein the Turkey is circulated. Each said circulation fan, prior Symbol circumferential direction is arranged substantially at regular intervals, to claim 1, characterized in that it is installed to blow hot air in one direction of the circumferential direction The thawing device described. Before claimed shelf is decompressor according to claim 1 or 2, characterized in that it is arranged at a lower position spaced a predetermined distance than the air heater and the circulation fan. The thawing chamber has a substantially square horizontal cross-sectional shape,
The thawing device according to any one of claims 1 to 3, wherein at least four or more circulation fans are provided in the thawing chamber. The thawing chamber is configured to connect at least two rooms having a substantially square horizontal cross-sectional shape and form a continuous internal space in which the adjacent surfaces of the rooms are open surfaces,
5. The thawing device according to claim 1, wherein the warm air and a plurality of circulation fans surrounding the warm air are installed for each room.   The hot air heater and the plurality of circulation fans are installed so as to circulate hot air in one circumferential direction for each room that is a constituent element of the thawing chamber, and in the two adjacent rooms. 6. The thawing apparatus according to claim 5, wherein the circulatory directions of the hot air circulating are opposite to each other.   The thawing apparatus according to claim 5 or 6, wherein the warm air heaters installed in two adjacent rooms are installed so as to blow warm air in different directions.

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