JP2009036496A - Rack for freezing-refrigerating warehouse and operation method of air curtain device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate installation, and to improve energy-saving effect, in a rack for a freezing-refrigerating warehouse having an air curtain device. <P>SOLUTION: This invention is characterized by installing the air curtain device 38 for shielding space between a low temperature area 16 of a freezing temperature zone, and a high temperature area 18 of a refrigerating temperature zone by an air flow of two layers, in the rack 10 arranged in the low temperature area 16, in the freezing-refrigerating warehouse 12 divided into the area 16 and the area 18. This air curtain device is composed of an upper unit 40 composed of a first air blower 42 taking in and delivering air in the low temperature area and a second air blower 44 taking in and delivering air in the high temperature area, and a lower unit 60 for sucking and returning the air flow from the first air blower 42 to the low temperature area. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a freezing and refrigeration warehouse suitable for sorting work in which goods stored in a rack are picked up according to an order and packed in a cold box, so-called picking work, and in particular, a rack equipped with an air curtain device and an air curtain device It relates to the driving method.

  Many products such as food delivered to supermarkets and restaurants are generally frozen and temporarily stored in a freezer rack. Sorting operations when shipping frozen products, so-called picking operations, are conventionally performed in a freezing warehouse in a freezing temperature zone (below zero, preferably about −10 ° C. to −25 ° C.) or once from a freezing warehouse. This was done after moving the frozen product to a refrigerated warehouse in a refrigerated temperature zone (low temperature above zero degree, preferably about + 5 ° C.).

  However, picking work in a freezer warehouse has a problem that it is heavy on the operator and is inefficient.

  In addition, the picking operation in the refrigerated warehouse reduces the load on the operator, but there is a risk that the quality of the frozen product is deteriorated.

  For this reason, conventionally, as disclosed in the following Patent Document 1, the warehouse is divided into a freezing temperature zone area (hereinafter referred to as “low temperature area”) and a refrigeration temperature zone area (hereinafter referred to as “high temperature area”). The rack for storing products is arranged in the low temperature area, and the rack product outlet is directed to the high temperature area so that workers can complete the picking work in a short time in the high temperature area. Refrigerated warehouse is known.

Moreover, in the freezer refrigerator warehouse of patent document 1, in order to partition a low temperature area and a high temperature area, the air curtain apparatus is used. The air curtain device is attached to a partition wall (kamoi-shaped wall) that hangs down from the ceiling of the warehouse building to near the rack in order to partition the low temperature area and the high temperature area. In order to enhance the air curtain effect, the air curtain device includes a first blower that blows cold air having a temperature equivalent to that of the low temperature area toward the floor surface from above on the low temperature area side, and a floor from above on the high temperature area side. It is comprised from the 2nd air blower which blows off the cold air of the temperature equivalent to a high temperature area toward the surface direction, and these air blowers are attached to the partition wall in the form which pinches | interposes a partition wall.
JP 2006-90619 A

  However, in the conventional refrigerator-freezer warehouse as described above, since the air curtain device is attached to the partition wall of the warehouse building, the installation work becomes large.

  In addition, an air curtain device must be installed over the entire boundary between the low temperature area and the high temperature area, which requires a large number of air curtain devices, which is not preferable from the viewpoint of energy saving.

  Further, since there is a partition wall between the first blower and the second blower of the air curtain device, turbulent flow is likely to occur between the layers of the cold air discharged from these blowers, so that the wind speed control of the cold air is controlled. It was difficult, and it was necessary to provide a wedge-shaped panel for stabilizing the flow between the first and second blowers.

  An object of the present invention is to solve the above problems.

In order to achieve the above object, the present invention provides a refrigeration warehouse that is divided into a freezing temperature zone area (low temperature area) and a refrigerating temperature zone area (high temperature area) higher than the freezing temperature zone. In the rack for storing frozen products installed in the low temperature area, an air curtain device is installed to block between the low temperature area and the high temperature area by a two-layer air flow. The device
a. From the first blower that takes in and discharges air in the low-temperature area and the second blower that takes in and discharges air in the high-temperature area and the discharge port is disposed adjacent to the discharge port of the first blower An upper unit attached to the top of the rack,
b. A lower unit disposed at the bottom of the rack, for sucking the airflow from the first blower and returning it to the low temperature area;
It is characterized by having.

  In such a configuration, since the air curtain device is integrated with the rack, it is not necessary to install the air curtain device on the partition wall of the warehouse. Further, since an air curtain is formed for each rack, it is not necessary to provide an air curtain device at a position where no air curtain is required. Furthermore, since the discharge port of the first blower and the discharge port of the second blower are disposed adjacent to each other, the possibility that the air flow is disturbed is reduced.

  Moreover, it is preferable that the 1st air blower is comprised so that air may be taken in from the 1st duct part extended in a horizontal direction, and air may be discharged from the lower opening part of the 2nd duct part extended in an up-down direction. In this configuration, the first duct portion can be passed under the partition wall, and the rack can be easily installed.

  It is also effective to attach an indicator for indicating a frozen product to be taken out to the rack so as to be positioned between the air flow discharged from the second blower and the high temperature area. This is to protect against the adverse effects of air below zero.

  Furthermore, it is preferable to provide a warm shut-off means at each position of the rack adjacent to the product outlet. This is because, together with the air curtain, the blocking efficiency between the lower temperature area and the higher temperature area is increased.

  Further, according to the second aspect of the present invention, the rack installed in the low-temperature area in the freezer / refrigeration warehouse divided into the low-temperature area and the high-temperature area higher than the refrigeration temperature zone has a low temperature. In the operation method of the air curtain device provided to block between the area and the high temperature area by the two-layer air flow, the air curtain device includes the upper unit composed of the first blower and the second blower described above, A lower unit that sucks the airflow from the first blower and returns it to the low-temperature area, on which the airflow velocity from the first blower and the airflow velocity from the second blower are Is in the range of 3.5 to 6.0 m / s. In this operation method, the air curtain effect is sufficiently exhibited.

  In addition, it is effective to set the width of the discharge port of the first blower to 50 mm or more so that the width of each air flow is sufficient to obtain the air curtain effect.

  In addition, in order to respond to changes in the environment such as the number of workers and the product occupancy rate in the warehouse, load detection means for detecting the operation load of the cooler for cooling the low temperature area is provided. Wind speed detection means for detecting the wind speed of the air flow and the wind speed of the air flow from the second blower is provided, and the wind speed from the wind speed detection means is adjusted so that the operating load of the cooler is within a predetermined range from the load detection means. Controls the wind speed of the air flow from the first blower and the wind speed of the air flow from the second blower according to the detected value, and controls the lower unit to suck air in the same amount as the air flow from the first blower. Good. The reason for controlling the lower unit is that when the suction amount is small, the air flow in the refrigeration temperature zone from the first blower is not collected by the lower unit, and the efficiency is reduced. This is because the air in the refrigerated temperature zone is sent to the low temperature area and the burden on the refrigerator increases.

  As described above, according to the rack for a refrigerator warehouse of the present invention, since the air curtain device is integrated with the rack, it is not necessary to install the air curtain device on the partition wall of the warehouse, and the installation work is easy. In addition, it becomes easy to deal with various warehouses.

  In addition, since an air curtain is formed for each rack, it is not necessary to provide an air curtain device at a position where the air curtain is unnecessary, which is effective from the viewpoint of energy saving.

  Furthermore, since the discharge port of the first blower and the discharge port of the second blower are arranged adjacent to each other, the possibility that the air flow is disturbed is reduced, and the air curtain effect is improved.

  The air curtain effect can be reliably obtained by the operation method of the air curtain device of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an example of a freezer / refrigerated warehouse 12 in which a flow rack 10 as a rack according to the present invention is installed. As shown in the figure, the freezer / refrigerated warehouse 12 has a low temperature area (freezing temperature zone area) 16 for storing frozen goods 14 and a high temperature area (refrigerated temperature zone area) 18 where an operator performs picking work. Both areas 16 and 18 are partitioned by a partition wall 22 that is suspended from the ceiling 20 of the warehouse building by a predetermined length. The low-temperature area 16 is at a temperature suitable for storing the frozen product 14 by a cooler (not shown), that is, below zero degree, and is preferably maintained at about −10 ° C. to −25 ° C. Moreover, although the high temperature area 18 is kept at zero or more by another cooler (not shown), the temperature suppresses the melting of the frozen product 14 taken out from the low temperature area 16 as much as possible, and the In order to reduce the load, about + 5 ° C. is preferable. The height from the floor surface 24 to the partition wall 22 is made larger than the total height of the flow rack 10.

  As shown in FIG. 2, the flow rack 10 includes left and right side frames 26 and a shelf 28 that is horizontally mounted between the side frames 26. The shelves 28 are arranged in a plurality of stages in the vertical direction. Each shelf 28 includes a roller conveyor or wheel conveyor 30 extending in the front-rear direction, and is inclined downward in one direction so that the frozen product 14 placed thereon moves by its own weight. Hereinafter, this direction is referred to as the front (left direction in FIG. 1). The frozen product 14 stops at the front end edge of each shelf 28, and becomes a product take-out port 32. In the present embodiment, the end edge of the lower shelf 28 protrudes forward so that the product 14 can be easily taken out.

  Further, support beams 34 and 36 are horizontally mounted between the upper portions of the left and right side frames 26 in the flow rack 10 in the front and rear directions. The upper unit 40 of the air curtain device 38 is fixed to the front support beam 34.

  The upper unit 40 of the air curtain device 38 includes two blowers 42 and 44 as can be understood from FIG. The first blower 42 is placed in the gap between the partition wall 22 and the flow rack 10 in a state where the flow rack 10 is installed at a predetermined position (the position of FIG. 1) in the freezer / refrigeration warehouse 12, and the second blower 42 The blower 44 is arranged at a position in contact with the front surface of the partition wall 22.

  The first blower 42 includes a first duct portion 46a extending horizontally, a second duct portion 46b disposed in front of the first duct portion 46a and extending downward, and the first and second duct portions 46a, It is comprised from the curved duct part 46c which connects between 46b. These duct portions 46a to 46c are preferably made of a thin metal plate such as stainless steel. A fan unit 50 having a plurality of blower fans 48 is attached to the rear opening of the first duct portion 46a. By operating the blower fan 48, air is taken in from the rear, and the air is discharged from the first duct portion 46a through the curved duct portion 46c and downward from the lower opening (discharge port) 46d of the second duct portion 46b. can do.

  The second blower 44 includes a duct portion 52 extending in the vertical direction, and a fan unit 56 having a plurality of blower fans 54 is attached to an upper opening of the second blower 44 so as to suck air from above and flow downward. Yes. The duct portion 52 is also made of a thin metal plate such as stainless steel, but the lower portion 52a on the rear surface shares the thin metal plate constituting the front surface of the curved duct portion 46c and the second duct portion 46b in the first blower 42. Yes. An upper portion 52 b on the rear surface of the duct portion 52 extends vertically and is in close contact with the partition wall 22. Further, the front surface of the duct portion 52 in the second blower 44 is substantially parallel to the front surface of the second duct portion 46 c in the first blower 42, and a lower opening (discharge port) 52 c of the duct portion 52. The air flow discharged from the first air blower is substantially parallel to the air flow discharged from the first blower 42.

  The upper unit 40 of the air curtain device 38 is attached by fixing the first duct portion 46a to the front support beam 34 of the flow rack 10 with a bolt or the like. When air is discharged from each of the blowers 42 and 44 with the upper unit 40 attached to the flow rack 10, the air flow from the first blower 42 is the front end edge of the shelf 28 of the flow rack 10, that is, the product removal. The mounting position of the upper unit 40 is adjusted so that it passes immediately before the port 32, and the orientations of the discharge ports 46d and 52c of the first and second blowers 42 and 44 are determined.

  Further, the air curtain device 38 includes a lower unit 60 disposed at the lowermost portion of the flow rack 10 so as to face the upper unit 40. The lower unit 60 is for sucking the air flow discharged from the discharge port 46d of the first blower 42 in the upper unit 40 and flowing it backward.

  More specifically, as shown in FIG. 3, the lower unit 60 is connected to the upward first duct portion 62a for sucking the air flow from the first blower 42 and the first duct portion 62a. And a second duct portion 62b extending rearward in the horizontal direction. These duct portions 62a and 62b are also preferably made of a thin metal plate such as stainless steel. A fan unit 66 having a plurality of suction fans 64 is attached to the rear opening portion of the second duct portion 62b so as to suck air from the upper opening portion (suction port) 62c of the first duct portion 62a. Such a lower unit 60 is arranged by inserting the second duct portion 62b below the lowermost shelf 28 of the flow rack 10.

  A curved plate 68 is guided to a portion between the first duct portion 62a and the second duct portion 62b so that the air sucked into the first duct portion 62a is smoothly guided to the second duct portion 62b. It is preferable to arrange as a plate. In addition, since the upper opening 62c of the first duct portion 62a is at a position where products and the like are likely to fall, it is preferable to arrange a honeycomb structure or a porous plate 70 as a falling portion intrusion prevention means.

  When installing the flow rack 10 integrally provided with such an air curtain device 38 in the freezer / refrigeration warehouse 12, for example, the rear part of the flow rack 10 is directed from the high temperature area 18 to the low temperature area 16 and the flow rack 10 is simply pushed. The second duct portion 46a of the upper unit 40 in the air curtain device 38 can be passed through the lower side of the partition wall 22 and can be set as shown in FIG.

  Usually, a predetermined number of flow racks 10 are arranged in the horizontal direction, but the gap formed between the flow racks 10 may be closed with a suitable plate material. As a result, the air curtain device 38 may be attached only to the portion where the air curtain is originally required, that is, the flow rack 10, and the air curtain device is provided over the entire boundary portion between the low temperature area 16 and the high temperature area 18 as in the past. This is more effective in terms of energy saving than providing it.

  In the configuration as described above, when the refrigerated warehouse 12 and the air curtain device 38 are operated, the inside of the low temperature area 16 becomes a refrigeration temperature zone below zero degrees, and the inside of the high temperature area 18 becomes a refrigeration temperature zone above zero degrees. . The low-temperature air in the low-temperature area 16 is taken into the first duct portion 46a by the fan unit 50 of the first blower 42 of the air curtain device 38, deflected by the curved duct portion 46c, and then the second duct portion 46c. The lower opening 46d is discharged downward. Further, the air of zero degree or higher in the high temperature area 18 is taken into the duct portion 52 by the fan unit 56 of the second blower 44 of the air curtain device 38 and discharged downward from the lower opening 52 c of the duct portion 52. The air flow from the first blower 42 and the air flow from the second blower 44 are substantially parallel, and only a thin plate exists between the first blower 42 and the second blower 44. Therefore, both airflows flow downward in a stable state. The low-temperature air flow from the first blower 42 is sucked by the lower unit 60 and returned to the low-temperature area 16. On the other hand, the air flow from the second blower 44 circulates in the high temperature area 18. Therefore, the low-temperature area 16 and the high-temperature area 18 are effectively cut off by these two layers of air flow, and the low-temperature area 16 eventually reaches and maintains the freezing temperature zone, and the high-temperature area 18 reaches and maintains the refrigeration temperature zone. The

  Under such circumstances, the frozen product 14 is safely stored on each shelf 28 of the flow rack 10 located in the low temperature area 16 on the rear side of the air curtain. Further, even if the worker enters the high temperature area 18, since it is a refrigerated temperature zone, the burden on the body is light, and the product outlet 32 of the flow rack 10 is adjacent to the high temperature area 18. The air curtain is blocked for taking out the product 14 in a moment, and the product 14 can be packed in the cold box 74 flowing through the collection line 72 in a single hour.

  In general, in picking work, an electrical indicator 76 such as a digital indicator is generally attached to each shelf 28 of the flow rack 10 in order to indicate the product 14 to be taken out. In order to prevent these indicators 76 from coming into contact with the low-temperature air, it is preferable to arrange the indicators 76 at positions ahead of the air flow from the second blower 44 (high-temperature area 18).

  Here, the air curtain effect of the air curtain device 38 will be examined. As described above, since the first blower 42 and the second blower 44 are disposed adjacent to each other via only one thin plate, the air flow from each of the blowers 42 and 44 is substantially stable. It flows in a state parallel to. Further, the air flow from the second blower 44 is considered to play a role of preventing or suppressing the diffusion of the low-temperature air flow from the first blower 42. In the configuration of the present invention, such an air flow state is obtained, and therefore it can be expected that a higher air curtain effect can be obtained by controlling the wind speed of the air flow from each of the fans 42 and 44.

  Therefore, as a result of intensive studies, the present inventors have found that when the wind speed of the air flow from each of the fans 42 and 44 is substantially the same and the speed is 3.5 to 6.0 m / s, It has been found that high blocking efficiency (air curtain efficiency) can be obtained.

  4 and 5 show the interruption efficiency (converted from the load of the cooler) when the wind speed is changed when the temperature of the low temperature area 16 is −15 ° C. and the temperature of the high temperature area 18 is 5 ° C. It is a represented graph. Note that the wind speeds from the first and second blowers 42 and 44 are equal to each other, and the discharge amount from the first blower 42 and the suction amount of the lower unit 60 are set to be equal. In the case of FIG. 4, the width (length in the front-rear direction) of the discharge ports 46 d and 52 c of the first and second blowers 42 and 44 is 100 mm, and in the case of FIG. 5, the first and second blowers 42, The width of the 44 discharge ports 46d and 52c was 50 mm.

  From these graphs, it was found that the efficiency peaked when the wind speed was about 4.5 m / s, and sufficient efficiency was obtained in the range of 3.5 to 6.0 m / s.

  In addition, when the width of the discharge ports 46d and 52c is 100 mm, a more stable result is obtained than when the discharge port is 46 mm. However, a more stable air film is obtained when the width is 100 mm. Means what is required. Therefore, the width of the discharge ports 46d and 52c is preferably 50 mm or more.

  Since the shutoff efficiency depends on the magnitude of the wind speed, the inventors further control the air flow from the first blower 42 and the air flow from the second blower 44 separately. The air curtain effect can be further improved. Therefore, a detector (load detection means) (not shown) for detecting an operating load such as power consumption of the cooler in the low temperature area 16 and a rotational speed detector (wind speed) of the blower fans 48 and 54 of the fan units 50 and 56 are provided. Detecting means) (not shown) and controlling the wind speed by adjusting the rotational speed of the blower fans 48 and 54 so that the load of the cooler for maintaining the temperature of the low temperature area 18 is within a predetermined range. Is effective. Further, when the amount of air discharged from the first blower 42 is larger than the amount of air sucked by the lower unit 60, a part of the air in the refrigeration temperature zone flows into the high-temperature elf 18 to reduce the efficiency. In the case of a small amount, a part of the air in the refrigeration temperature zone flows into the low temperature area 16 from the lower unit 60, so that the burden on the refrigerator increases, so the amount of air discharged from the first blower 42 and the lower unit 60 It is preferable to control the blower fan 48 and the suction fan 64 so that the amount of air sucked in is substantially the same.

  At night when picking work is not performed, the front surface of the flow rack 10 may be covered with a vinyl sheet called a night cover, a roll curtain, or the like for the purpose of maintaining the temperature of the areas 16 and 18 and saving energy. Is preferred.

  As mentioned above, although preferred embodiment of this invention was described in detail, it cannot be overemphasized that this invention is not limited to the said embodiment.

  For example, you may provide a baffle plate in the discharge outlet of the 1st and 2nd air blower in an air curtain apparatus.

  In addition, in order to reduce the substantial internal space of the low temperature area as much as possible and improve the cooling efficiency, a bottom plate (closing plate) is provided between the lowest shelf of the flow rack and the second duct portion of the lower unit. Arranging is also effective.

  In addition, by providing a warm shut-off means at the front of each stage of the flow rack, even if the air curtain is broken during picking, the outflow of the low temperature air in the flow rack to the high temperature area can be minimized. Yes (reference numeral 80 in FIG. 2).

It is a figure which shows the freezer refrigerator warehouse where the flow rack as a rack of this invention was installed. It is a perspective view which shows the upper part of a flow rack, and the upper unit of an air curtain apparatus. It is a perspective view which shows the lower unit of an air curtain apparatus. It is a graph which shows the relationship between a wind speed and air curtain efficiency. The case of FIG. 4 is a graph showing the relationship between the wind speed and the air curtain efficiency by changing the temperature of the low temperature area.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Flow rack, 12 ... Refrigerated cold storage, 14 ... Refrigerated goods, 16 ... Low temperature area (freezing temperature zone area), 18 ... High temperature area (refrigeration temperature zone area), 20 ... Ceiling, 22 ... Partition wall, 26R , 26L ... side frame, 28 ... shelf, 32 ... commodity outlet, 38 ... air curtain device, 40 ... upper unit, 42 ... first blower, 44 ... second blower, 46a ... first duct part, 46b ... 2nd duct part, 46d ... lower opening part (discharge port of 1st blower), 48 ... blower fan, 52 ... duct part, 52c ... lower opening part (discharge port of 2nd fan), 54 ... blower fan, 60 ... Lower unit, 62a ... First duct part, 62b ... Second duct part, 62c ... Upper opening (suction port), 64 ... Suction fan, 72 ... Collection line, 74 ... Cold box, 76 ... Indicator, 80 Cut-off means.

Claims (7)

In the refrigeration warehouse (12) divided into a freezing temperature zone area (16) and a refrigeration temperature zone area (18) higher than the freezing temperature zone, the freezing temperature zone area (16 In the rack (10) for storing frozen goods (14) installed in
An air curtain device (38) is installed to block between the freezing temperature zone area (16) and the refrigeration temperature zone area (18) by two layers of air flow,
The air curtain device (38)
a. The first blower (42) that takes in and discharges air in the area (16) of the refrigeration temperature zone, and takes in and discharges air in the area (18) of the refrigeration temperature zone, and discharge ports (52c) ) Is an upper unit (40) attached to the top of the rack (10), comprising a discharge port (46d) adjacent to the discharge port (46d) of the first blower (42),
b. A lower unit (60) disposed at the bottom of the rack (10), for sucking an air flow from the first blower (42) and returning it to the area (16) of the refrigeration temperature zone;
A rack for a freezer / refrigerated warehouse.   The first blower (42) takes in air from the first duct portion (46a) extending in the horizontal direction and discharges air from the lower opening (46d) of the second duct portion (46b) extending in the up-down direction. The rack for a refrigerator-freezer warehouse according to claim 1, wherein the rack is configured as described above.   An indicator (76) for indicating a frozen product (14) to be taken out is positioned between the air flow discharged from the second blower (44) and the area (18) of the refrigeration temperature zone. The rack for a refrigerator-freezer warehouse according to claim 1 or 2, wherein the rack is attached to the rack.   The warming-like blocking means (80) is provided at a position adjacent to the product outlet (32) in each stage of the rack (10), according to any one of claims 1 to 3. Rack for freezing and refrigeration warehouse as described in 1. In the refrigeration warehouse (12) divided into a freezing temperature zone area (16) and a refrigeration temperature zone area (18) higher than the freezing temperature zone, the freezing temperature zone area (16 The air curtain device (10) is installed to block between the freezing temperature zone area (16) and the refrigeration temperature zone area (18) by a two-layer air flow. 38) In the driving method,
The air curtain device (38),
a. The first blower (42) that takes in and discharges air in the area (16) of the refrigeration temperature zone, and takes in and discharges air in the area (18) of the refrigeration temperature zone, and discharge ports (52c) An upper unit (40) attached to the top of the rack (10), comprising a second blower (44) arranged adjacent to the discharge port (46d) of the first blower (42),
b. A lower unit (60) disposed at the bottom of the rack (10), for sucking an air flow from the first blower (42) and returning it to the area (16) of the refrigeration temperature zone;
With
The wind speed of the air flow from the first blower (42) and the wind speed of the air flow from the second blower (44) are in the range of 3.5 to 6.0 m / s, Operation method of air curtain device.   The operation method of the air curtain device according to claim 5, wherein a width of the discharge port (46d) of the first blower (42) is 50 mm or more. A load detecting means for detecting an operating load of a cooler for cooling the area (16) in the freezing temperature zone;
A wind speed detecting means for detecting a wind speed of the air flow from the first blower (42) and a wind speed of the air flow from the second blower (44);
The wind speed of the air flow from the first blower (42) and the second speed according to the detected value of the wind speed from the wind speed detecting means so that the operation load of the cooler is within a predetermined range from the load detecting means. The air flow from the blower (44) is controlled, and the lower unit (60) is controlled to suck air in the same amount as the air flow from the first blower (42). The operation method of the air curtain apparatus of Claim 5 or 6.

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