Freezer

Abstract

To provide a freezer which enables improvement of food cooling efficiency and controllability of food freezing speed and can inhibit cooling unevenness from occurring in objects to be cooled.SOLUTION: A freezer 1 includes: a first partition part 20 which divides an inside of the freezer into an upper space S1 and a lower space S2; a second partition part 30 which divides the upper space S1 into a first upper space S3 and a second upper space S4 in a horizontal direction; a fan casing 55 which is provided at the first partition part 20 so that a suction side opening communicates with the lower space S2 and a discharge side opening communicates with the first upper space S3; a fan 50 provided within the fan casing 55; a heat exchange part 40 which is provided at the second partition part so that an inflow side opening communicates with the first upper space S3 and an outflow side opening communicates with the second upper space S4; and an opening 21 which allows the second upper space S4 and the lower space S2 to communicate with each other in the first partition part 20.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a freezer. [Background technology]

[0002] In conventional freezers, a cooling unit (cooler and fan) is placed on the floor or hung from the ceiling inside the freezer, and food is cooled or frozen by placing a cart carrying the food or other items to be cooled inside the freezer (for example, Patent Document 1 below).

[0003] When cooling and freezing food in the freezers described above, low-temperature airflow is used as the cooling medium. In order to achieve high-quality freezing of frozen foods, it is necessary to make the ice crystals inside the frozen food small. It is also necessary to prevent deterioration caused by the surface drying out of the food due to exposure to air for long periods of time. On the other hand, in food freeze-drying lines, it is generally necessary to properly control the uniformity of the airflow and the freezing time when freezing the food in order to generate ice crystals of the appropriate size inside the food. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-129604 A Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional freezers, although the cooling and freezing of food is eventually completed, there is an issue that the food freezes slowly and is difficult to control because the structure is not designed to actively collect cold air toward the items being cooled.In addition, there is an issue that temperature unevenness occurs in the air inside the freezer, causing uneven cooling between food placed near the heat exchanger and food placed far away.

[0006] The present invention has been invented to solve the above-mentioned problems, and aims to provide a freezer that can improve the cooling efficiency and controllability of the freezing speed of food, while preventing uneven cooling of the items being cooled. [Means for solving the problem]

[0007] The freezer of the present invention which achieves the above-mentioned objectives comprises a first partition which divides the interior of the freezer into an upper space and a lower space, a second partition which divides the upper space horizontally into a first upper space and a second upper space, a fan casing provided in the first partition so that its suction side opening communicates with the lower space and its discharge side opening communicates with the first upper space, a fan provided in the fan casing, a heat exchanger provided in the second partition so that its inlet side opening communicates with the first upper space and its outlet side opening communicates with the second upper space, and an opening in the first partition which communicates between the second upper space and the lower space. Effect of the Invention

[0008] According to the above-mentioned freezer, the circulating air can be sent to the objects to be cooled as much as possible, thereby improving the cooling efficiency of the objects and the controllability of the freezing speed. In addition, since the circulating air flows uniformly inside the freezer, the air sent to the objects to be cooled can be made uniform, and the occurrence of uneven cooling of the objects to be cooled can be suppressed. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic perspective view showing a freezer according to an embodiment of the present invention; [Diagram 2] FIG. 11 is a schematic perspective view showing a freezer according to a comparative example. [Diagram 3] FIG. 11 is a contour diagram showing the magnitude of the flow velocity in the freezer according to the embodiment. [Figure 4] FIG. 11 is a contour diagram showing the magnitude of the flow velocity in a freezer according to a comparative example. [Diagram 5] 11 is a vector diagram showing a flow rate in a freezer according to the present embodiment. [Figure 6] 13 is a vector diagram showing a flow rate in a freezer according to a comparative example. [Figure 7] 10 is a graph showing freezing speeds in freezers according to the present embodiment and a comparative example. [Figure 8] FIG. 11 is a schematic perspective view showing a freezer according to a first modified example. [Figure 9] FIG. 11 is a contour diagram showing the magnitude of the flow velocity in a freezer according to the first modification. [Figure 10] 13 is a vector diagram showing the flow rate in a freezer according to the first modified example. [Figure 11] FIG. 11 is a schematic perspective view showing a freezer according to a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the present invention will be described with reference to Fig. 1. In the description of the drawings, the same elements are given the same reference numerals, and duplicated descriptions will be omitted. The dimensional ratios in the drawings are exaggerated for the convenience of explanation, and may differ from the actual ratios.

[0011] Fig. 1 is a schematic perspective view showing a freezer 1 according to an embodiment of the present invention. The freezer 1 is composed of a first side wall 2, a second side wall 3, a third side wall 4, a fourth side wall 5, which are made of thermally insulated walls, a ceiling 6, and a floor 7. In this specification, as shown in Fig. 1, the horizontal direction in which the first side wall 2 and the second side wall 3 face each other is referred to as the X direction, the horizontal direction (depth direction) in which the third side wall 4 and the fourth side wall 5 face each other is referred to as the Y direction, and the vertical direction in which the ceiling 6 and the floor 7 face each other is referred to as the Z direction.

[0012] The freezer 1 according to this embodiment can be used as a batch-type freezer. The freezer 1 has one inlet and one outlet (not shown) that communicate with the interior space 10, which are provided in the third side wall 4 or the fourth side wall 5. The inlet and outlet may be combined and provided in the third side wall 4 or the fourth side wall 5. The object to be cooled by the freezer 1 is food in general. The temperature inside the freezer 1 is not particularly limited, but is, for example, −35 to −20° C. In this embodiment, the rack R of the cart is arranged so as to be in the short side direction with respect to the flow direction of the air circulating inside the freezer. Three racks R are provided along the X direction.

[0013] As shown in FIG. 1, the freezer 1 has an interior space 10, a first partition section 20 that divides the interior space 10 in the Z direction into an upper space S1 and a lower space S2, a second partition section 30 that divides the upper space S1 in the X direction into a first upper space S3 and a second upper space S4, a heat exchange section 40 arranged in the second partition section 30, a fan 50 arranged on the first upper space S3 side of the first partition section 20, a fan casing 55 in which the fan 50 is housed, an air guide plate 60 provided on the ceiling 6 side of the fan 50 in the Z direction, a third partition section 70 arranged on the second side wall 3 side in the X direction of the rack R arranged on the cart, and a fourth partition section 80 arranged on the first side wall 2 side in the X direction of the rack R arranged on the cart.

[0014] The interior space 10 of the freezer 1 is divided into an upper space S1 and a lower space S2 by a first partition 20. In the lower space S2 of the interior space 10, three rows of racks R are arranged in the X direction, each row being mounted on a cart (not shown) and extending in the Y direction.

[0015] The upper space S1 is divided by the second partition 30 into a first upper space S3 provided on the first side wall 2 side in the X direction and a second upper space S4 provided on the second side wall 3 side in the X direction.

[0016] The first partitioning section 20 is disposed on the XY plane. In other words, the first partitioning section 20 is disposed on a horizontal plane. The first partitioning section 20 may be configured to be disposed at an angle from the horizontal plane.

[0017] The first partition 20 divides the interior space 10 into an upper space S1 and a lower space S2, and forms an opening 21 on the second side wall 3 side in the X direction. As shown in FIG. 1, the opening 21 is formed in the end of the first partition 20 on the second side wall 3 side in the X direction.

[0018] Here, the area of ​​the opening 21 when viewed from the Z direction is preferably equal to or larger than the total opening area (passage cross-sectional area) of the heat exchange section 40 when viewed from the X direction. According to this configuration, the heat exchange section 40 can be used as a flow straightening grid.

[0019] The heat exchanger 40 may be a known one, for example, a fin tube cooler. The heat exchanger 40 may be cooled using a known refrigerator (not shown). A drain pan 41 is disposed below the heat exchanger 40. In this embodiment, two heat exchangers 40 are provided along the Y direction. The number of heat exchangers 40 is not limited to two, and may be one or three or more.

[0020] The heat exchange section 40 is provided in the opening 31 of the second partition section 30 such that the inlet opening communicates with the first upper space S3 and the outlet opening communicates with the second upper space S4. The heat exchange section 40 may be provided on the second partition section 30 in any of the following patterns: protruding from the second partition section 30 toward the first side wall 2 in the X direction, protruding from the second partition section 30 toward the second side wall 3 in the X direction, penetrating the second partition section 30, or embedded in the second partition section 30.

[0021] The heat exchanger 40 is preferably provided at approximately the center in the X direction in the interior space 10. With this configuration, the distance from the fan 50 can be increased, and the distance to the opening 21 can also be increased. By increasing the distance from the fan 50, the wind discharged from the fan 50 can flow into the heat exchanger 40 with a reduced swirling component, and the wind taken into the heat exchanger 40 can be made uniform. Furthermore, by increasing the distance to the opening 21, the wind passing through the opening 21 can be made uniform, and the wind can be suitably moved to the lower space S2 via the opening 21.

[0022] As shown in FIG. 1, the second partition 30 divides the upper space S1 into a first upper space S3 and a second upper space S4 when viewed from the third side wall 4 side in the Y direction. The second partition 30 is provided along the YZ plane at a location where the heat exchanger 40 is disposed. The second partition 30 has an opening 31 arranged to cover the outer periphery of the heat exchanger 40 and the drain pan 41 when viewed from the X direction. Therefore, by providing the second partition 30, when the wind moves from the first upper space S3 to the second upper space S4, all the wind flows into the heat exchanger 40. Therefore, the wind can be efficiently cooled in the heat exchanger 40, and the function of the heat exchanger 40 as a straightening grid can be maximized. The second partition 30 may be configured to be inclined with respect to the YZ plane.

[0023] Six fans 50 are provided along the Y direction at the end of the first partition section 20 on the first side wall 2 side in the X direction. The number of fans 50 depends on the desired air volume. The number of fans 50 is not limited to six, and may be five or less or seven or more.

[0024] The fan 50 is housed in a fan casing 55. The fan casing 55 is provided in the first partition section 20 such that an intake side opening communicates with the lower space S2 and a discharge side opening communicates with the first upper space S3. The fan casing 55 may be provided in the first partition section 20 in any of the following patterns: the fan casing 55 is provided so as to protrude from the first partition section 20 toward the ceiling 6 in the Z direction, the fan casing 55 is provided so as to protrude from the first partition section 20 toward the floor 7 in the Z direction, the fan casing 55 is provided so as to penetrate the first partition section 20, or the fan casing 55 is provided so as to be embedded in the first partition section 20.

[0025] The fan 50 is disposed at an end of the first partition section 20 on the first side wall 2 side in the X direction so as to discharge wind toward the ceiling 6 side in the Z direction. Here, for example, if the fan is disposed at a position close to the heat exchange section 40, the wind discharged from the fan has a swirling component, and therefore the wind does not enter the heat exchange section 40 as it is uniformed. In contrast, in this embodiment, the fan 50 is disposed at an end of the first partition section 20 on the first side wall 2 side in the X direction, and therefore the fan 50 is disposed at a position relatively far from the heat exchange section 40. Therefore, the swirling component of the wind discharged from the fan 50 is attenuated, and uniformed wind can be allowed to flow into the heat exchange section 40.

[0026] Furthermore, for example, if the fan is positioned so as to blow air toward the floor 7 in the Z direction, the air having a swirling component will be blown into the rack R of the cart, making it difficult to uniformly cool the objects to be cooled in the rack R. In contrast, according to the freezer 1 of this embodiment, the air blown from the fan 50 flows from the upper space S1 through the opening 21 to the lower space S2, and the uniform air is blown into the rack R of the cart, making it possible to uniformly cool the objects to be cooled in the rack R.

[0027] The air guide plate 60 is disposed along the Y direction on the ceiling 6 side of the fan 50 in the Z direction. The air guide plate 60 is provided to guide the wind discharged from the fan 50 toward the heat exchanger 40. When viewed from the third side wall 4 side in the Y direction, the air guide plate 60 has a first contact portion 61 that contacts the inner surface of the first side wall 2 in the X direction and a second contact portion 62 that contacts the lower surface of the ceiling 6. The method of fixing the first contact portion 61 and the second contact portion 62 to the freezer 1 is not particularly limited. The air guide plate 60 is configured to be curved so as to be convex toward the ceiling 6 side in the Z direction from the first contact portion 61 to the second contact portion 62. The air guide plate 60 may be configured to be convex toward the ceiling 6 side in the Z direction on multiple planes. Alternatively, the air guide plate 60 may be configured with one plane.

[0028] Moreover, when viewed from the third side wall 4 side in the Y direction, the second contact portion 62 of the air guide plate 60 is preferably disposed closer to the second side wall 3 in the X direction than the central portion of the fan 50. With this configuration, the wind discharged from the fan 50 reliably hits the air guide plate 60, so that the wind can be suitably guided toward the heat exchanger 40.

[0029] The third partitioning section 70 is disposed along the YZ plane on the second side wall 3 side in the X direction of the rack R provided in the lower space S2. The third partitioning section 70 has an opening 71 disposed so as to cover the outer periphery of the rack R of the cart when viewed from the second side wall 3 side in the X direction. Therefore, by providing the third partitioning section 70, when the wind moves in the lower space S2 from the second side wall 3 side to the first side wall 2 side in the X direction, all the wind is taken in by the rack R of the cart. Therefore, all the wind cooled by the heat exchange section 40 can be sent to the object to be cooled, improving the cooling efficiency. The third partitioning section 70 may be disposed at an angle with respect to the YZ plane.

[0030] The fourth partitioning section 80 is disposed along the YZ plane on the first side wall 2 side in the X direction of the rack R provided in the lower space S2. The fourth partitioning section 80 has an opening 81 disposed so as to cover the outer periphery of the rack R of the dolly when viewed from the first side wall 2 side in the X direction. Therefore, by providing the fourth partitioning section 80, it is possible to suppress the wind moving through the rack R of the dolly toward the first side wall 2 side in the X direction from flowing out to a place where the rack R does not exist on the third side wall 4 side and the fourth side wall 5 side in the Y direction. This improves the cooling efficiency. The fourth partitioning section 80 may be disposed at an angle with respect to the YZ plane.

[0031] Next, the flow of air in the freezer 1 according to this embodiment will be described.

[0032] The wind discharged from the fan 50 toward the ceiling 6 in the Z direction is redirected toward the second side wall 3 in the X direction by the air guide plate 60, flows into the heat exchanger 40, and is cooled in the heat exchanger 40. The air cooled in the heat exchanger 40 flows out toward the second side wall 3 in the X direction, and then moves from the upper space S1 to the lower space S2 through the opening 21. The air that moves to the lower space S2 enters the rack R of the cart in its entirety, cools the objects to be cooled placed on the rack R, and then moves toward the first side wall 2 in the X direction and is sucked in by the fan 50. That is, in the freezer 1 according to this embodiment, the air circulates clockwise when viewed from the third side wall 4 in the Y direction of FIG. 1.

[0033] Next, with reference to Figs. 2 to 7, the effects of freezer 1 according to this embodiment will be described with reference to the wind speeds in freezer 1 according to this embodiment and freezer 90 according to a comparative example.

[0034] First, the configuration of a freezer 90 according to a comparative example will be briefly described with reference to Fig. 2. Fig. 2 is a schematic perspective view showing a freezer 90 according to a comparative example. As shown in Fig. 2, the freezer 90 according to the comparative example has two cooler units 91 provided along the Y direction on the side of the first side wall 2 in the X direction and on the side of the ceiling 6 in the Z direction, and does not have a first partition section and the like provided in the freezer 1 according to this embodiment.

[0035] The flow speed inside the freezer was simulated assuming that the flow speed of the airflow from the fan 50 of the freezer 1 according to the embodiment and the cooler unit 91 of the freezer 90 according to the comparative example was 5 m / s. FIG. 3 is a contour diagram showing the magnitude of the flow speed in the freezer 1 according to the embodiment. FIG. 4 is a contour diagram showing the magnitude of the flow speed in the freezer 90 according to the comparative example. FIG. 5 is a vector diagram showing the flow speed in the freezer 1 according to the embodiment. FIG. 6 is a vector diagram showing the flow speed in the freezer 90 according to the comparative example.

[0036] In the contour diagrams of Fig. 3 and Fig. 4, the darker color (black) indicates a flow velocity of 0 m / s, and the lighter color (white) indicates a flow velocity of 5 m / s. As can be seen from Fig. 3 and Fig. 4, the color of the rack R of the cart is lighter in Fig. 3, so it can be seen that the flow velocity at the rack R of the cart is higher in the freezer 1 according to this embodiment shown in Fig. 3 than in the freezer 90 according to the comparative example shown in Fig. 4. The flow velocity at the rack R of the cart of the freezer 1 according to this embodiment was 2 m / s. Also, the flow velocity at the rack R of the cart of the freezer 90 according to the comparative example was 0.5 m / s.

[0037] Next, in the vector diagrams of Fig. 5 and Fig. 6, the magnitude of the vector indicates the flow velocity, and the larger the vector, the faster the flow velocity. Since the magnitude of the vector is larger in Fig. 5 at the rack R of the cart, it can be seen that the flow velocity at the rack R of the cart is higher in the freezer 1 according to the present embodiment shown in Fig. 5 than in the freezer 90 according to the comparative example shown in Fig. 6. Also, in Fig. 5, the magnitude of the vector near the inlet and the magnitude of the vector inside the rack are almost equal, so it can be seen that the inflowing wind is uniform, while in Fig. 6, the flow velocity inside the rack is slower than the flow velocity at the inlet, while the flow velocity around the rack is faster, so it can be seen that the wind is not flowing in uniform.

[0038] Next, the freezing speed of the object to be cooled in the freezer 1 according to this embodiment and the freezer 90 according to the comparative example will be described with reference to Fig. 7. Fig. 7 is a graph showing the freezing speed in the freezers 1 and 90 according to this embodiment and the comparative example. In the graph of Fig. 7, the horizontal axis indicates time (seconds) and the vertical axis indicates temperature (°C).

[0039] As shown by the dotted line in Figure 7, in the case of freezer 1 according to this embodiment, the object to be cooled is frozen in approximately 1800 seconds (30 minutes). In contrast, as shown by the solid line in Figure 7, in the case of freezer 90 according to the comparative example, the object to be cooled is frozen in 3600 seconds (60 minutes). In this way, according to freezer 1 according to this embodiment, the freezing speed of the object to be cooled can be improved and the growth of ice crystals in the object to be cooled can be suppressed.

[0040] As described above, the freezer 1 according to this embodiment includes the first partition 20 that divides the interior into an upper space S1 and a lower space S2, the second partition 30 that divides the upper space S1 horizontally into a first upper space S3 and a second upper space S4, the fan casing 55 provided in the first partition 20 so that the intake side opening communicates with the lower space S2 and the discharge side opening communicates with the first upper space S3, the fan 50 provided in the fan casing 55, the heat exchanger 40 provided in the second partition 30 so that the inlet side opening communicates with the first upper space S3 and the outlet side opening communicates with the second upper space S4, and the opening 21 that communicates the second upper space S4 and the lower space S2 in the first partition 20. According to the freezer 1 configured in this manner, the circulating wind can be sent to the object to be cooled as much as possible, thereby improving the cooling efficiency and controllability of the freezing speed of the object to be cooled, and in particular, the freezing speed of the object to be cooled can be improved. In addition, since the circulating air flows evenly inside the cabinet, the air sent to the objects to be cooled can be made uniform, thereby preventing uneven cooling of the objects to be cooled.

[0041] Moreover, the freezer 1 according to this embodiment further includes an air guide plate 60 that is provided above the fan 50 and directs the air discharged from the fan 50 to the heat exchange section 40. With the freezer 1 configured in this manner, the air discharged from the fan 50 can be made to flow favorably into the heat exchange section 40.

[0042] Moreover, the freezer 1 according to the present embodiment is used as a batch type freezer, and the object to be cooled is placed on the rack R. The third partition section 70 is provided on the inflow side of the rack R and is arranged to cover the periphery of the rack R when viewed from the second side wall 3 side in the X direction, and the fourth partition section 80 is provided on the outflow side of the rack R and is arranged to cover the periphery of the rack R when viewed from the first side wall side in the X direction. According to the freezer 1 configured in this manner, by providing the third partition section 70, all wind flows into the rack R of the dolly. Therefore, the wind cooled by the heat exchange section 40 can be suitably sent to the object to be cooled, and the cooling efficiency is improved. In addition, by providing the fourth partition section 80, the wind moving through the rack R of the dolly to the first side wall 2 side in the X direction can be prevented from flowing out to a place where the rack R is not present on the third side wall 4 side and the fourth side wall 5 side in the Y direction, and therefore the cooling efficiency is improved and the occurrence of cooling unevenness can be more suitably suppressed.

[0043] Moreover, the rack R is arranged so that its short side is in the flow direction (X direction) of the air circulating inside the freezer. According to the freezer 1 configured in this way, it is possible to reduce the pressure loss in the rack R and to more uniformly cool the objects to be cooled arranged on the rack R.

[0044] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.

[0045] For example, a punched metal or grating may be arranged in the opening 21 of the above-described embodiment. In this case, the total area of ​​the gaps in the punched metal or grating is preferably equal to or larger than the total opening area of ​​the heat exchanger 40 when viewed from the X direction. With this configuration, the punched metal or grating can be used as a straightening grid, so that more uniform wind can be made to flow into the rack R of the cart.

[0046] In the above-described embodiment, the third partition section 70 and the fourth partition section 80 are provided, but the third partition section 70 and the fourth partition section 80 may not be provided, as in the freezer 1A according to the first modification shown in FIG. 8. Here, FIG. 9 is a contour diagram showing the magnitude of the flow velocity in the freezer 1A according to the first modification, and FIG. 10 is a vector diagram showing the flow velocity in the freezer 1A according to the first modification. Comparing FIG. 3 and FIG. 9, and FIG. 5 and FIG. 10, it can be seen that the provision of the third partition section 70 improves the cooling efficiency because all the air cooled by the heat exchange section 40 can be sent to the object to be cooled, as described above.

[0047] In the above-described embodiment, the flow direction (X direction) of the air circulating within the internal space 10 of the freezer 1 coincides with the longitudinal direction of the internal space 10. However, as in a freezer 1B according to Modification 2 shown in Fig. 11, the flow direction (X direction) of the air circulating within the internal space 10B of the freezer 1B may be configured to coincide with the lateral direction of the internal space 10B. With a freezer 1B configured in this manner, it is possible to reduce pressure loss of the air.

[0048] Furthermore, in the above-described embodiment, the freezer 1 is used as a batch-type freezer, but the freezer 1 may also be used as a storage or spare freezer.

[0049] Moreover, the third partition section 70 and the fourth partition section 80 may be configured with shutters that can be opened and closed in the Z direction. With this configuration, it is possible to control the sizes of the openings 71 and 81 that become the ventilation areas.

[0050] In the above embodiment, the method of use was described to improve the freezing speed of frozen foods. However, the freezer according to this embodiment can also be used to generate ice crystals of appropriate size in food on a food freeze-drying line. In this case, the use of the freezer according to this embodiment can favorably control the uniformity of the air flow during freezing of the food and the freezing time. [Explanation of symbols]

[0051] 1, 1A, 1B Freezer, 2 first side wall, 3 second side wall, 4 third side wall, 5 Fourth side wall, 6 Ceiling, 7 beds, 10, 10B Interior space, 20 First partition section, 30 second partition section, 40 heat exchange section, 41 Drain pan, 50 fans, 60 Wind guide plate, 70 Third partition, 80 Fourth partition, R rack, S1 upper space, S2 lower space, S3 1st upper space, S4 Second upper space.

Claims

1. A first partition portion that divides the interior of the storage unit into an upper space and a lower space; a second partition portion that divides the upper space horizontally into a first upper space and a second upper space; a fan casing provided in the first partition portion such that an intake side opening communicates with the lower space and a discharge side opening communicates with the first upper space; A fan provided in the fan casing; a heat exchange section provided in the second partition section such that an inlet side opening communicates with the first upper space and an outlet side opening communicates with the second upper space; A freezer having an opening in the first partition that connects the second upper space and the lower space.

2. The freezer according to claim 1 , wherein the opening is provided with a punched metal or a grating.

3. 3. The freezer according to claim 1, further comprising an air guide plate provided above the fan for directing air discharged from the fan to the heat exchanger.

4. Used as a batch freezer, The objects to be cooled are placed on racks, A third partition portion is provided on the inlet side of the rack and arranged to cover the periphery of the rack when viewed from the inlet side of the rack; The freezer according to claim 1 or 2, further comprising: a fourth partition portion provided on an outlet side of the rack and arranged so as to cover a periphery of the rack when viewed from the outlet side of the rack.

5. The freezer according to claim 4 , wherein the racks are arranged so that their short sides are aligned with respect to a flow direction of air circulating inside the freezer.

6. The freezer according to claim 1 or 2, wherein a flow direction of air circulating inside the freezer coincides with a short side direction of the freezer.

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