JP5495501B2 - Article cooling apparatus using cold leak prevention method and method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method and apparatus for preventing cold leakage, and in particular, it is possible to effectively prevent cold leakage from an opening of a to-be-cooled object transporting conveyor through the article cooling device. The present invention relates to a method and an article cooling apparatus using the method .

  In various food manufacturing plants, various freezing and cooling facilities have been introduced so that the food can be kept fresh at a low temperature by being rapidly frozen, and can be kept fresh at any time for a long period of time. The schematic plan view shown by 10 in FIG. 5 is placed by the conveyor 12 provided from the inlet side opening 15 to the outlet side opening 16 while keeping the inside temperature at −20 ° C. to −35 ° C. as an example. This is a freezer that is an article cooling device that performs quick freezing while moving an object to be cooled such as food in the article processing space.

  In FIG. 5, 11 is a unit cooler as an air treatment device for keeping the inside of the freezer 10 at −20 ° C. to −35 ° C., and 12 is a conveyor on which an object to be cooled such as food is placed and conveyed into the freezer 10. The conveyor 12 is formed in a spiral shape with a spiral portion (drum portion) 13. 14 is a cooler fan, 15 is an inlet side opening for carrying a product to be cooled placed on the conveyor 12 into the freezer 10, 16 is an outlet side opening for carrying out the same, and 18 and 19 are cold air. The arrows 121 and 122 indicating the flow direction of the conveyor are the traveling direction of the conveyor.

  In this freezer 10, food or the like to be cooled placed on the conveyor 12 proceeding in the direction of the arrow 121 is carried from an inlet side opening 15 provided on the low side, and the conveyor 12 becomes spiral. When it is gradually carried upward by the spiral part (drum part) 13, it is cooled by the cold air generated by the unit cooler 11 and carried by the cooler fan 14 in the direction of the arrow 18, and is rapidly frozen and provided at the upper part. It is carried out from the outlet side opening 16 in the direction of the arrow 122.

  The freezer as the article cooling device is not only the spiral type freezer 10 shown in FIG. 5, but also a straight type in which the conveyor is straight, and a spiral type opposite to that in FIG. There are various types of freezers, such as those having an opening for unloading.

  However, in such a freezer 10, the specific weight of air increases due to the above-described internal temperature of −20 ° C. to −35 ° C., and cold air accumulates in a low part, causing a pressure difference with the outside air, As shown by the arrow 19 from the loading opening 15 at a low place, there is a problem that cold air leaks out. If the height relationship between the carry-in opening 15 and the carry-out opening 16 is reversed, the cool air leaks from the carry-out opening 16.

  For example, in Patent Document 1, an annular air chamber is formed outside the opening of the cooling chamber, and an inert gas is pressurized in the chamber as necessary. It is disclosed that a gas curtain is formed by feeding in and ejecting from a jet outlet to prevent intrusion of outside air into the space inside the cooling chamber or diffusion of the cooling chamber gas into the outside atmosphere.

  Further, in Patent Document 2, in such a gas curtain (air curtain), in a low temperature freezer facility of about −40 ° C., the differential pressure between the positive pressure region and the negative pressure region is large, and the air curtain turns up. Because there is no effect, a chamber is provided at the inlet and outlet of the conveyor that is in contact with the positive pressure region and negative pressure region so that the movement of the conveyor is not hindered, and the chamber is connected to the positive pressure region and negative pressure region with a duct. Thus, there is shown an article processing apparatus in which the pressure in the chamber is approximated to atmospheric pressure to prevent leakage of cold air.

  Furthermore, in Patent Document 3, the carry-in port of the object to be cooled is formed in the upper part, the carry-out port is formed in the lower part, an air supply fan is provided in the apparatus adjacent to the carry-in port, and the cold air in the cooling space is introduced and pressurized. A front chamber that is partially open to the internal cooling space is maintained, and a flexible blocking plate (goodwill) is provided on the internal wall side of the front chamber to open the object to be cooled. There is shown a vertical type cooling device that is configured to be able to seal the carry-in entrance by using the applied pressure in the front chamber.

Japanese Patent Publication No.51-2128 Japanese Patent Laid-Open No. 60-200068 Japanese Patent Publication No.7-117334

  However, in the method for preventing cold air leakage by the gas curtain disclosed in Patent Document 1, as described above, in the low temperature freezer facility at about -40 ° C., the differential pressure between the positive pressure region and the negative pressure region is large. Curtain turning phenomenon occurs and the effect cannot be expected. Further, the article processing apparatus disclosed in Patent Document 2 requires a duct for connecting the chamber, the positive pressure region, and the negative pressure region, and the device is large and expensive.

  Furthermore, the vertical cooling device shown in Patent Document 3 has a structure in which cold air inside the device is not directly exposed to the outside when the object to be cooled is brought in by providing a pressurized front chamber. The flexible closing plate (goodwill) facilitates entry from the outside to the outside at the carry-in entrance and prevents outflow from the inside to the outside, and facilitates outflow from the inside to the outside at the carry-out exit from the inside to the outside. Therefore, the point that the cold air leaks out from the front chamber when the object to be cooled is carried in is not improved, and the cold air leaks out from the carry-out port provided in the lower part.

  And if the cold air leaks, the cooling efficiency will drop, and if the outside air with high humidity is sucked in, frost will adhere to the unit cooler 11, forcing the cooler fan 14 and the unit cooler 11 to operate at a high load, When the input amount increases and the load increases, the product freezes down, the conveyor 12 before and after the freezer freezes due to cold air, and a conveyance trouble occurs. Further, defrosting to remove the attached frost causes various troubles such as the production of the product being stopped.

Therefore, in the present invention, it is possible to prevent the cold air from leaking to the outside with a simple structure, improve the deterioration of the cold air circulation efficiency due to the intrusion of the outside air, and continue the non-defrost operation. It is an object to provide an article cooling device using the above and methods .

In order to solve the above problems, the cold leak prevention method according to the present invention is as follows.
The object to be cooled is placed on a conveyor in an article cooling space in which cold air is generated and circulated by an air treatment device inside the heat insulating wall, and is transported from the inlet side opening to the outlet side opening to freeze the object to be cooled. In the cold air leakage prevention method in the article cooling apparatus designed to do so,
The article cooling apparatus is configured to place a body to be cooled on a conveyor, carry it into an article cooling space from an opening on the inlet side provided on the lower side in the apparatus, and place it in an article cooling space. It is constructed so that it is gradually conveyed to the upper side and is carried out from the outlet side opening provided on the upper side in the apparatus to the outside of the apparatus, and the object to be cooled is generated by a unit cooler as an air treatment device during that time. So, it is designed to freeze quickly with the cold air sent to the spiral conveyor,
Rotate to the position facing the upper surface of the cooled object placing side conveyor and the position facing the left and right of the return side conveyor on the surrounding wall provided so as to surround the entrance side opening. the number variably chromatic圧扇provided, determine the rotational speed of the respective chromatic圧扇causing no cold air leakage, is stored in advance in the memory a rotational speed determined the, according to the rotation speed stored in the memory by controlling rotational speed, sucking each cold air in the upper space around and left right sides space around the return-side conveyor of the object to be cooled the placing side conveyor of the space surrounded by the surrounding wall, conveying said spirally Blowing back into the article cooling space toward the part reduces the amount of outside air sucked from the outlet side opening where the pressure fan is not provided.

And the article cooling device using this method is
There is a conveyor for placing the object to be cooled from the opening on the inlet side, moving in the article cooling space inside the heat insulating wall, and transporting it to the opening on the outlet side, allowing the cold air to flow into the article cooling space. In the article cooling apparatus that freezes the object to be cooled,
The article cooling apparatus is configured to place a body to be cooled on a conveyor, carry it into an article cooling space from an opening on the inlet side provided on the lower side in the apparatus, and place it in an article cooling space. It is constructed so that it is gradually conveyed to the upper side and is carried out from the outlet side opening provided on the upper side in the apparatus to the outside of the apparatus, and the object to be cooled is generated by a unit cooler as an air treatment device during that time. So, it is designed to freeze quickly with the cold air sent to the spiral conveyor,
Rotate to the position facing the upper surface of the cooled object placing side conveyor and the position facing the left and right of the return side conveyor on the surrounding wall provided so as to surround the entrance side opening. An anti-cold-leakage prevention device equipped with a variable number of pressure fans is provided, and the number of rotations of each pressure fan that does not cause cold-air leakage is obtained, and the obtained number of rotations is stored in a memory in advance. by controlling the rotational speed according to the rotation speed stored in the memory, the upper space around the object to be cooled the placing side conveyors of surrounded by the surrounding wall space and the left and right sides around the return-side conveyors sucking cold air space respectively, wherein the blow back it in a spiral-shaped transport section the article cooling space toward, to reduce the suction of outside air from the no chromatic圧扇is provided the outlet opening Configured,
Furthermore, the cold air leakage prevention device is provided in a cooled object inlet side opening provided on a lower portion side in the article cooling device.

  In this way, a pressure fan capable of changing the number of rotations is provided on a plurality of surfaces surrounding the reciprocating portion on the cooled object placement side and the return side of the conveyor on the entrance side or inside the outlet side opening in the article cooling device. The direction of the flow of the cold air flowing out from the opening of the article cooling device on both the front and back sides of the conveyor is forcibly changed by sucking out the cold air around the reciprocating part of the conveyor and blowing it back into the article cooling space. Since the article cooling device tries to keep the pressure inside the device at the same pressure as described above, for example, when cool air flows out from the inlet side opening, the outside air is sucked in from the outlet side opening, but By sucking out with a pressure fan and reducing the outflow amount, the intake amount on the outside air intake side is relatively reduced, and the cold air circulation efficiency in the article cooling device is greatly increased.

  For this reason, inhalation of humid outside air may cause frost on the unit cooler and forced the cooler fan or refrigerator to operate at a high load, but this reduces the load and power consumption. In addition to reducing the amount of air, there is cold air that tends to escape from the inlet side or outlet side opening without providing an air curtain, chamber and duct, or front chamber with a flexible closing plate (goodwill). Since it is returned to the article cooling space by the pressure fan, both the outflow of cold air and the inflow of outside air are reliably prevented with a simple configuration, and the cold air leak prevention in the article cooling device that improves the deterioration of the cold air circulation efficiency due to the intrusion of outside air is prevented. A method can be provided.

Then, the plurality of chromatic圧扇the ceiling portion of the body to be cooled the placing side conveyor, and by sucking the cool air of the reciprocating portion sides of the return-side conveyor to be the lower conveyor of the conveyor, about to leave leakage The cooled air can be effectively used for cooling the object to be cooled in the article cooling space.

  Further, the pressure fan on the side surface of the reciprocating part of the conveyor can effectively use the cold air that is about to leak by sucking out the cold air at the height of the return-side conveyor surface serving as the lower conveyor.

  Further, the cool air leakage prevention device is normally provided at the cooled object inlet side opening portion or outlet side opening portion provided at the lower portion side in the article cooling device, so that it is normally −20 as described above. The specific weight of the air increases due to the internal temperature of ℃ ~ 35 ℃, but the cold air accumulates in the lower part, the pressure difference between the outside air and the cold air leaks from the opening, the effect Therefore, it is possible to prevent cold leaks.

  Then, the number of rotations of the pressure fan is controlled by a control circuit having an inverter circuit corresponding to the cooling capacity and the number of the air treatment devices and the outflow amount of the cold air. And a control circuit having an inverter circuit for controlling the number of revolutions of the pressure fan in correspondence with the cooling capacity and the number of unit coolers constituting the article cooling device, and the outflow amount of the cold air. The amount of cool air that flows out varies depending on the cooling capacity and number of unit coolers and the temperature inside the article cooling device. Therefore, if the rotational speed of the pressure fan is controlled accordingly, the cold air leaks efficiently. Can be prevented.

  As described above, the cold air leakage prevention method and apparatus of the article cooling apparatus according to the present invention surrounds the periphery of the reciprocating part on the cooled object placement side and the return side of the conveyor on the inlet side or inside the outlet side opening. By providing a pressure fan with a variable number of rotations on a plurality of surfaces, sucking out the cool air around the reciprocating part of the conveyor and blowing it back into the article cooling space, Because the direction of the cool air flow in the space around the return conveyor is forcibly changed, the outflow amount of cool air is reduced and the intake amount of outside air is also relatively reduced, and the cool air circulation efficiency in the article cooling device As a conventional device, both the outflow of cold air and the inflow of outside air can be ensured with a simple configuration without providing an air curtain, a chamber and duct, and a front chamber with a flexible closing plate (goodwill). Prevents outside air intrusion It is possible to provide a device with cold air leakage preventing method in an article cooling system that improves the deterioration of the cold air circulating efficiency by.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

  FIG. 1 is a schematic plan view of an embodiment of an article cooling apparatus 10 equipped with an apparatus for carrying out the cold leak prevention method according to the present invention, and FIG. 2 is a schematic front view of an apparatus for carrying out the cold leak prevention method. (A), a schematic side view (B), and FIG. 3 are schematic front views showing an area and a ventilation direction that each of the pressure fans constituting the device 17 for performing the cold air leakage prevention method.

  In the figure, the same reference numerals are given to the same components as the freezer 10 which is the article cooling apparatus described in FIG. 5, but briefly described, 10 is a freezer as an article cooling apparatus, 11 is a unit cooler, 12 is a conveyor, 121 and 122 are arrows indicating the direction of travel of the conveyor, 13 is a spiral conveyance unit, 14 is a cooler fan, 15 is an inlet side opening, 16 is an outlet side opening, and 17 is cold air according to the present invention. The leak prevention devices 18 and 19 are arrows indicating the flow direction of the cold air.

  The article cooling apparatus 10 according to the present invention is placed in the article cooling space by placing an object to be cooled on the conveyor 12 and carrying it into the article cooling space from the inlet side opening 15 provided on the low side. It is configured so that it is gradually transported to the upper side by the spiral-shaped transport unit 13 and is transported to the outside from the outlet side opening 16 provided on the upper side, and the object to be cooled is generated by the unit cooler 11 as an air treatment device in the meantime. Then, as indicated by the arrow 18 in the cooler fan 14, it is rapidly frozen by the cold air sent to the spiral conveyance unit 13.

  And in this invention, in order to prevent the cold air leak from the entrance side opening part 15 provided in the low part side, the cool air leak prevention apparatus 17 provided so that the circumference | surroundings of the entrance side opening part 15 may be surrounded by a conveyor 12 indicates the direction of the flow of the cool air that sucks out the cool air in the surrounding space on the cooled object placement side and the cool air in the surrounding space of the return conveyor 12 and flows out from the article cooling device openings on both the front and back sides of the conveyor 12. As shown in FIG. 18, it is forcibly turned to the spiral conveying section 13 side and then returned to the unit cooler 11, and as in the conventional apparatus, an air curtain, a chamber and a duct, a flexible closing plate (goodwill) Even without providing a front chamber or the like having both, it is possible to prevent both the outflow of cold air and the inflow of outside air, thereby improving the deterioration of the cold air circulation efficiency caused by the intrusion of outside air.

  At this time, the article cooling device 10 tries to keep the pressure inside the device at the same level, but the cold air flows out from the outlet side opening 16 when the cold air flows out from the inlet side opening 15, for example. By providing the leakage prevention device 17 on the cold air outflow side and reducing the outflow amount, the intake amount on the outside air intake side is relatively reduced, and the cold air circulation efficiency in the article cooling device 10 is greatly increased, as described above. The deterioration of the cold air circulation efficiency can be improved.

  FIG. 2A is a schematic front view of the cold air leakage prevention device 17, and FIG. 2B is a schematic side view thereof. In the figure, 171 is provided so as to surround the inlet-side opening 15, and an enclosure wall to which a pressure fan constituting the cool air leakage prevention device 17 shown by 20, 21, 22 is attached, and 123 is a body to be cooled. The object-to-be-cooled object mounting side 124 of the conveyor 12 that is placed and carried into the article cooling space of the article cooling apparatus 10 is a return-side conveyor. The conveyor 12 is provided with chains on both sides of the belt. For example, the chain is formed by sprockets 125 and 126 provided at the inlet side opening 15 and the outlet side opening 16 of the article cooling apparatus 10, respectively. Driven, the object to be cooled is carried out in the direction indicated by 122 in the outlet side opening 16 via the spiral conveyance unit 13.

  In addition, the pressure fans 20, 21, and 22 of the cold air leakage prevention device 17 are such that the pressure fan 20 first surrounds the periphery of the entrance-side opening 15 so that the product placement-side conveyor 123 on the surrounding wall 171 is provided. The pressure fans 21 and 22 are provided at positions facing the left and right sides of the return-side conveyor 124 on the surrounding wall 171 at positions facing each other, as shown by arrows 19 in FIG. Cold air that is about to escape from the inlet-side opening 15 is sent out in the direction of the spiral conveying section 13 as indicated by 18 in FIG.

  As shown in FIG. 3, each of the pressure fans 20, 21, and 22 is a portion of the surrounding space indicated by hatching 30 indicated on the upper side of the drawing of the cooled object mounting side conveyor 123. First, the pressure fans 21 and 22 indicate the cool air in the left surrounding space where the pressure fans 21 are hatched as indicated by 31 of the return side conveyor 124, and the pressure fans 22 are indicated as 32 of the return side conveyor 124. As shown in FIG. 1, as indicated by 18 in FIG. 1, the cold air in the right-side surrounding space with hatching is sucked out and sent out in the direction indicated by arrows 33, 34, and 35. Let go.

  Accordingly, the cold air that is about to leak out from the inlet side opening 15 indicated by the arrow 19 in FIG. 5 is sent out in the direction of the spiral conveyance unit 13 as shown by 18 in FIG. Therefore, as described above, when the article cooling device 10 tries to keep the pressure inside the device at the same pressure, when cool air flows out from the inlet side opening 15, the outside air is sucked from the outlet side opening 16, but the cold air leaks. By providing the prevention device 17 on the cold air outflow side to reduce the outflow amount, the intake amount on the outside air intake side is relatively reduced, and frost is attached to the unit cooler by sucking in the outside air with high humidity, and the cooler fan or freezer It is prevented that the machine performs high-load operation and frequent defrosting, so that the cool air circulation efficiency in the article cooling device 10 is greatly increased, and the deterioration of the cool air circulation efficiency can be improved as described above.

The amount of cool air flowing out varies depending on the cooling capacity and the number of unit coolers 11 and cooler fans 14 constituting the freezer 10, but for example, the area of the inlet side opening 15 and the outlet side opening 16 is approximately 0.3 to 0. and .5M ^2, when the wind speed of the cool air leakage and the average 1.5~3.0m / sec, air flow rate per one opening is considered to be about 27~90m ³ / min. Therefore, for example, if ^three pressure fans of about 28 to 30 m ³ / min (static pressure 50 Pa) are used, the suction amount is 90 m ³ / min at the maximum, so the cooling capacity and number of unit coolers 11 and cooler fans 14, And a control circuit having an inverter circuit for controlling the rotational speed of the pressure fans 20, 21, and 22 in correspondence with the outflow amount of the cold air, and by controlling the rotational speed according to the situation, The leakage prevention device and the article cooling device can be operated.

  FIG. 4 shows an example in that case. In the figure, reference numeral 40 denotes a control circuit having a control CPU 41 and an inverter circuit 42 for controlling the rotational speeds of the pressure fans 20, 21, and 22. The control circuit 40 is an operation status of the unit cooler 11 and the cooler fan 14. The number of revolutions of the pressure fans 20, 21, and 22 is controlled based on the temperature in the freezer 10 and the like.

  In the control, for example, the rotational speeds of the pressure fans 20, 21, and 22 that do not cause cold leakage are determined in advance from the operating conditions of the unit cooler 11 and the cooler fan 14, the temperature in the freezer 10, and the like. There is a method in which the rotational speed of the corresponding pressure fans 20, 21, and 22 is determined based on the actual operating status of the unit cooler 11 and the cooler fan 14, the temperature in the freezer 10, and the like. In addition, pressure is applied so that the target temperature becomes the target temperature when the power consumption of the unit cooler 11 is the smallest, based on the target temperature of the freezer 10, the operating status of the unit cooler 11 and the cooler fan 14, the actual temperature in the freezer 10, and the like. You may make it feedback-control the rotation speed of the fan 20,21,22.

  As described above, the freezer 10 as the article cooling device is not only the spiral type freezer 10 shown in FIG. 1, but also the straight type in which the conveyor is straight, and the spiral opposite to the case of FIG. There are various types of freezers, such as those with an opening for unloading on the low side, and any type of freezer that has an inlet side opening and an outlet side opening. Of course it is good.

  In the above description, the case where the cool air leakage prevention device 17 is provided only in the inlet side opening 15 has been described as an example. However, it is also provided in the upper outlet side opening 16 or the outlet side opening is freezer. Of course, in the type of freezer provided on the lower portion side of 10, it may be provided in the outlet side opening on the lower portion side. However, as described above, the specific weight of the air increases at the internal temperature of −20 ° C. to −35 ° C., whereby the cooled air accumulates on the low side, and a pressure difference is generated between the outside air and the opening. Therefore, it is more preferable to provide a cold air leakage prevention device at the lower side opening, so that it is effective even if the upper side opening is not equipped with a cold air leakage prevention device. It is possible to prevent cold leakage.

  As described above, according to the present invention, the cool air leakage prevention device sucks out the cool air in the surrounding space of the cooled object mounting side conveyor and the cool air in the return side surrounding space, and opens the article cooling device on both sides of the conveyor front and back sides. Because the direction of the cold air flowing out from the section is forcibly changed, the opening on the inlet side or outlet side can be opened without providing an air curtain, a chamber and duct, or a front chamber having a flexible closing plate (goodwill). Cold air that is about to escape from the air is returned to the article cooling space by a pressure fan, preventing both the outflow of cold air and the inflow of outside air, and high loads on cooler fans and refrigerators due to the intake of humid outside air It is possible to provide a cold air leakage prevention method and apparatus in an article cooling apparatus that eliminates operation and frequent defrosting and improves deterioration of the cold air circulation efficiency due to intrusion of outside air.

  According to the present invention, it is possible to provide an article cooling apparatus that can prevent the leakage of cold air that could not be done without providing a complicated structure with a simple structure and can quickly freeze foods and the like efficiently. Can do.

It is a schematic plan view of one Example of the article | item cooling device provided with the apparatus which implements the cold air leak prevention method which becomes this invention. It is the schematic front view (A) and schematic side view (B) of the apparatus which implements the cold leak prevention method which becomes this invention. It is the schematic front view which showed the area and ventilation direction which each pressure fan which comprises the apparatus which implements the cold leak prevention method which concerns on this invention. It is a block diagram of the control circuit of the pressure fan which comprises the apparatus which implements the cold air leak prevention method which becomes this invention. It is a schematic plan view of the conventional article cooling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Freezer 11 Unit cooler 12 Conveyor 121, 122 Conveyor moving direction 123 Product loading side conveyor 124 Return side conveyor 125, 126 Sprocket 13 Spiral conveyance part 14 Cooler fan 15 Inlet side opening part 16 Outlet side opening part 17 Prevention of cold air leakage Device 171 Go wall 18, 19 Cold air flow direction arrow 20, 21, 22 Pressured fan 30 Product placement side conveyor surrounding cold 31 Return side conveyor surrounding left half cold 32 Return side conveyor surrounding right half cold 33, 34, 35 Cold progress Direction arrow

Claims (4)

The object to be cooled is placed on a conveyor in an article cooling space in which cold air is generated and circulated by an air treatment device inside the heat insulating wall, and is transported from the inlet side opening to the outlet side opening to freeze the object to be cooled. In the cold air leakage prevention method in the article cooling apparatus designed to do so,
The article cooling apparatus is configured to place a body to be cooled on a conveyor, carry it into an article cooling space from an opening on the inlet side provided on the lower side in the apparatus, and place it in an article cooling space. It is constructed so that it is gradually conveyed to the upper side and is carried out from the outlet side opening provided on the upper side in the apparatus to the outside of the apparatus, and the object to be cooled is generated by a unit cooler as an air treatment device during that time. So, it is designed to freeze quickly with the cold air sent to the spiral conveyor,
Rotate to the position facing the upper surface of the cooled object placing side conveyor and the position facing the left and right of the return side conveyor on the surrounding wall provided so as to surround the entrance side opening. the number variably chromatic圧扇provided, determine the rotational speed of the respective chromatic圧扇causing no cold air leakage, is stored in advance in the memory a rotational speed determined the, according to the rotation speed stored in the memory by controlling rotational speed, sucking each cold air in the upper space around and left right sides space around the return-side conveyor of the object to be cooled the placing side conveyor of the space surrounded by the surrounding wall, conveying said spirally Cooling air leakage prevention method characterized by reducing the amount of outside air sucked from the outlet side opening not provided with the pressure fan by blowing back into the article cooling space toward the part . The rotational speed of the chromatic圧扇, cooling capacity of the air treatment system, the number and cool air leakage prevention method according to claim 1, in correspondence to the outflow of the cold air and controls it. There is a conveyor for placing the object to be cooled from the opening on the inlet side, moving in the article cooling space inside the heat insulating wall, and transporting it to the opening on the outlet side, allowing the cold air to flow into the article cooling space. In the article cooling apparatus that freezes the object to be cooled,
The article cooling apparatus is configured to place a body to be cooled on a conveyor, carry it into an article cooling space from an opening on the inlet side provided on the lower side in the apparatus, and place it in an article cooling space. It is constructed so that it is gradually conveyed to the upper side and is carried out from the outlet side opening provided on the upper side in the apparatus to the outside of the apparatus, and the object to be cooled is generated by a unit cooler as an air treatment device during that time. So, it is designed to freeze quickly with the cold air sent to the spiral conveyor,
Rotate to the position facing the upper surface of the cooled object placing side conveyor and the position facing the left and right of the return side conveyor on the surrounding wall provided so as to surround the entrance side opening. An anti-cold-leakage prevention device equipped with a variable number of pressure fans is provided, and the number of rotations of each pressure fan that does not cause cold-air leakage is obtained, and the obtained number of rotations is stored in a memory in advance. by controlling the rotational speed according to the rotation speed stored in the memory, the upper space around the object to be cooled the placing side conveyors of surrounded by the surrounding wall space and the left and right sides around the return-side conveyors sucking cold air space respectively, wherein the blow back it in a spiral-shaped transport section the article cooling space toward, to reduce the suction of outside air from the no chromatic圧扇is provided the outlet opening Configured,
Furthermore, the cold air leakage prevention device is provided in a cooled object inlet side opening provided on a lower portion side in the article cooling device. The article cooling apparatus includes a control circuit having an inverter circuit that controls the number of rotations of the pressure fan in accordance with the cooling capacity and the number of unit coolers constituting the article cooling apparatus, and the outflow amount of the cold air. The article cooling apparatus according to claim 3 , wherein the article cooling apparatus is provided.

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