JP2019039631A - Low temperature storage cabinet - Google Patents

Abstract

To provide a low temperature storage cabinet capable of smoothly heating air inside of a storage space and further capable of heating the air inside of the storage space while promoting stirring of the air without being accompanied with temperature unevenness.SOLUTION: A low temperature storage cabinet comprises a heating structure 5 for freezing prevention which heats air inside of a storage space. At multiple positions on an inner peripheral wall of an inner box 7, longitudinal frame bodies 30 are fixed in a longitudinally long attitude. The longitudinal frame body 30 is formed from a hollow wire material including an air passage 36 insides, and the air passage 36 is communicated with the storage space via an exit and an entrance. The heating structure 5 consists of: a heater unit 41 disposed on a wall surface of the inner peripheral wall of the inner box 7 that faces the longitudinal frame body 30, closer to a heat insulation material; a heat dissipation wall 42 which dissipates heat of the unit 41 towards the air passage 36; and the air passage 36. The heated air that is heated by the heat dissipation wall 42, within the air passage 36 is discharged from the exit into the storage space while guiding the flow upwards by the longitudinal frame body 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a low-temperature storage for storing foods such as cereals such as brown rice, vegetables, fruits, or beverages in a low-temperature state, and more particularly to a low-temperature storage having a heating structure for preventing freezing.

  The present applicant has previously proposed such a low-temperature storage (Patent Document 1). There, anti-condensation heaters are placed inside the front peripheral wall of the storage room and inside the partition fixed to one of the doors, and the relationship between the outside temperature and storage room temperature and the reference and low temperature When the predetermined condition is satisfied, the control unit controls the driving state of the condensation prevention heater to prevent condensation.

  The low-temperature storage of the present invention has a heating structure for preventing freezing, and this type of refrigerator is known in Patent Document 2. There, the refrigerator body is composed of an outer box and an inner box, and a heat insulating material filled between the two boxes, and the outer surface of the inner box made of plastic material (the side in contact with the heat insulating material) is used for preventing overcooling. A heater is arranged. Specifically, a heater is disposed inside a notch (concave portion) provided in the heat insulating material, and a spacing plate for forming an air layer between the heater and the inner box is disposed. As described above, in the heating structure in which the air layer is provided between the heater and the inner box, the heat of the heater is conducted to the inner box by the convection action of the air in the air layer. It is possible to eliminate the deterioration of the food stored in the refrigerator main body during the operation of the heating structure.

JP 2007-292378 A Japanese Utility Model Publication No. 44-23666

  In cold districts, the temperature of the environment where the low temperature storage is installed may drop below the freezing point. Under such circumstances, the operation of the cooling unit is stopped to prevent the brown rice stored in the storage from being cooled excessively. However, if the temperature of the installation environment is remarkably lowered, it is not possible to prevent a drop in the internal temperature just by stopping the operation of the cooling unit, and the taste of the brown rice stored in the internal storage may be impaired. In addition, vegetables and fruits containing a lot of water may freeze and the taste may be impaired.

  If a heating structure like patent document 2 is added to a low-temperature storage, the air in a warehouse can be heated with the heat of a heater. Moreover, like the refrigerator of patent document 2, if the heat of the heater is conducted to the inner box by the convection action of the air in the air layer, the temperature of the wall facing the heater does not rise to near the heating temperature of the heater, The air in the cabinet can be warmed gently. However, since only the heater and the spacing plate are placed on the back (inner back surface) of the interior, the heated air is easy to convection near the interior ceiling of the interior, and the temperature distribution in the interior is large. It is inevitable that variations occur.

  An object of the present invention is to provide a low-temperature storage that can gently heat the air in the storage space, and can promote the stirring of the air in the storage space without causing temperature unevenness.

  The low-temperature storage according to the present invention was partitioned by the storage box body 1 and the storage box body 1 configured as a heat insulating box body with the outer box 6 and the inner box 7, and the heat insulating material 8 filled between both boxes 6 and 7. A cooling unit 3 for supplying cold air to the storage space 2 and a heating structure 5 for preventing freezing that heats the air in the storage space 2 are provided. Vertical frame bodies 30 are fixed in a vertically long posture at a plurality of locations on the inner peripheral wall of the inner box 7. The vertical frame 30 is formed of a hollow strip having an air passage 36 therein, and the air passage 36 communicates with the storage space 2 via an outlet 38 and an inlet 37 formed above and below the vertical frame 30. . The heating structure 5 is disposed on the wall surface of the inner peripheral wall of the inner box 7 facing the vertical frame 30 on the heat insulating material side, and the heat radiating wall 42 that releases the heat of the unit 41 toward the air passage 36. And an air passage 36.

The vertical frame 30 is formed of a strip provided with a bulging wall 33, and the opening surface side thereof is fixed to the inner box 7. A heat radiating wall 42 provided on the inner peripheral wall of the inner box 7 facing the bulging wall 33 is exposed to the air passage 36.

  The heater unit 41 includes a U-shaped heater body 43 that is disposed along the heat radiation wall 42 and has a low capacity and is long in the vertical direction. The heater units 41 are arranged in a distributed manner corresponding to the vertical frame bodies 30 arranged at a plurality of locations on the peripheral wall of the inner box 7. The low-capacity heater body 43 is a heater having a capacity of approximately 10 W to less than 40 W, and is appropriately selected and used according to the number of heater units 41 arranged.

  The heater unit 41 includes a heater body 43 and a pair of heater shape plates 44 and 45 that sandwich and fix the body 43. Of the two heater shape plates 44 and 45, one heater shape plate 44 is formed with a U-shaped shape retention groove 46 for accommodating the heater body 43, and the other heater shape plate 45 is a flat plate. It is in close contact with the heat radiating wall 42 in a state of closing the shape retaining groove 46.

  A shelf column 30 is fixed in a vertically long position at a plurality of locations on the inner peripheral wall of the inner box 7, and a shelf 31 is assembled to the shelf column 30 so that the vertical position can be changed. Doubles as

  A latching groove 35 for a latching bracket 34 that supports the shelf 31 is formed in a multistage shape on the bulging wall 33 of the shelf column 30. The air passage 36 communicates with the storage space 2 through the retaining groove 35.

  When the air temperature in the storage space 2 is 2 ° C. or less and one hour has passed after the compressor 17 constituting the cooling unit 3 is stopped, the heater unit 41 of the heating structure 5 is operated. be able to.

  In the present invention, the heating structure 5 is configured using the vertical frame 30 fixed to a plurality of locations on the inner peripheral wall of the inner box 7. The vertical frame 30 is formed of a hollow strip provided with an air passage 36 therein so that the air passage 36 communicates with the storage space 2 through an outlet 38 and an inlet 37. The heating structure 5 includes a heater unit 41 arranged on the inner peripheral wall of the inner box 7 facing the vertical frame 30, a heat radiating wall 42 that releases heat of the unit 41 toward the air passage 36, and an air passage. 36. According to such a low temperature storage, the air in the air passage 36 can be gently heated by the heat released from the heat radiating wall 42, so that the vertical frame 30 surrounding the heat radiating wall 42 is heated to near the heat generation temperature of the heater unit 41. Can be eliminated. In addition, by utilizing the fact that the specific gravity of the heated air in the air passage 36 is reduced, the heated air can be flow-guided toward the outlet 38 by the vertical frame body 30, and can be discharged vigorously from the outlet 38 to the storage space 2. The stirring of the air in the storage space 2 can be promoted and heating can be performed without causing temperature unevenness.

  The vertical frame 30 is formed of a strip provided with a bulging wall 33, and the opening surface side thereof is fixed to the inner box 7 so that the heat radiating wall 42 facing the bulging wall 33 is exposed to the air passage 36. did. When the heat radiating wall 42 is exposed to the air passage 36 in this way, the air in the air passage 36 can be directly heated by the heat radiating wall 42, so that the air in the air passage 36 is effective without heat loss. Can be heated. For example, when the vertical frame 30 is formed of a hollow strip having a square cross section, the heat of the heater unit 41 is fixed to the inner wall 7 (corresponding to a heat radiating wall) and the same wall. A heat loss is caused by the amount that is conducted to the air in the air passage 36 through the inner peripheral wall of the inner box 7 that is in close contact.

  The heater unit 41 includes a low-capacity U-shaped heater body 43 that is disposed along the heat radiation wall 42 and that is long in the vertical direction. Thus, if the heater body 43 is composed of a heater having a low capacity and a small calorific value, there is no need to provide a temperature fuse corresponding to each heater body 43, so the structure of the heating structure 5 is simplified accordingly. Thus, the overall cost of the heating structure can be reduced. Further, since the heater units 41 are arranged in a distributed manner corresponding to the vertical frames 30 arranged at a plurality of locations on the peripheral wall of the inner box 7, heated air can be discharged from the outlets 38 of the individual vertical frames 30, and the storage space The air in the storage space 2 can be heated evenly by further promoting the stirring of the air in the storage space 2.

  The heater unit 41 includes a heater body 43 and a pair of heater shape retaining plates 44 and 45. Of the two heater shape plates 44, 45, one heater shape plate 44 is formed with a U-shaped shape retention groove 46 for accommodating the heater body 43, and the other heater shape plate 45 is a flat plate. It was made to adhere to the heat radiating wall 42 in a state where the shape retaining groove 46 was closed. According to such a heater unit 41, the heat of the heater body 43 can be effectively conducted to the heat radiating wall 42 via the heater shape plate 45, so that the air in the air passage 36 can be efficiently heated by the heat radiating wall 42.

  According to the low temperature storage in which the shelf columns 30 fixed to a plurality of locations on the inner peripheral wall of the inner box 7 also serve as the vertical frame body, the heating structure 5 can be configured using the existing shelf columns 30. Compared with the case where a vertical frame is provided separately from the pillar 30, the internal structure of the low-temperature storage can be simplified, and the cost required for manufacturing can be reduced accordingly.

  When the latching groove 35 for the latching metal 34 is formed in a multistage shape on the bulging wall 33, the air passage 36 can be communicated with the storage space 2 via the latching groove 35. Therefore, a part of the air around the shelf column 30 flows into the air passage 36 through the retaining groove 35 where the retaining bracket 34 is not mounted, and receives the heat of the heat radiating wall 42 toward the outlet 38. And flow into the storage space 2. Therefore, in addition to the air below the inlet 37 of the air passage 36, the air around the shelf column 30 can also flow into the air passage 36 and be released from the outlet 38 while being heated by the heat radiating wall 42. Stirring of the air in the storage space 2 can be further promoted to heat the air in the storage space 2 evenly.

  When the air temperature in the storage space 2 is 2 ° C. or less and one hour has passed after the compressor 17 constituting the cooling unit 3 is stopped, the heater unit 41 of the heating structure 5 is operated. According to such a low temperature storage, the brown rice bag P accommodated in the storage space 2 can be effectively prevented from being exposed to a temperature below the freezing point and the taste of the brown rice being impaired.

It is a figure which shows the heating structure of the low-temperature storage which concerns on this invention, and is the sectional view on the AA line in FIG. It is a perspective view which shows the state which opened the door of the low-temperature storage which concerns on this invention. It is a cross-sectional top view which shows schematic structure of a low-temperature storage. It is the perspective view which fractured | ruptured a part of heater unit. It is a longitudinal cross-sectional view which shows the related structure of a shelf column and a shelf, and a latch. It is a longitudinal cross-sectional view of a shelf pillar.

(Example) FIG. 1 thru | or FIG. 6 shows the Example of the low-temperature storage which concerns on this invention. In the present invention, front / rear, left / right, and upper / lower follow the cross arrows shown in FIGS. 2 to 3 and the front / rear, left / right, and upper / lower indications shown in the vicinity of each arrow. In FIG. 2, the low-temperature storage includes a storage body 1, a door 4 that opens and closes an opening of the storage space 2 partitioned by the storage body 1, a cooling unit 3 that supplies cold air to the storage space 2, and air in the storage space 2. It consists of a heating structure 5 for preventing freezing to be heated. The storage body 1 is formed of a vertically long rectangular box whose front surface is open, and is configured as a heat insulating box with an outer box 6 and an inner box 7 and a heat insulating material 8 filled between both boxes 6 and 7. A partition block 11 is embedded and fixed on one side of the ceiling wall of the storage body 1, and suction ports 12 and feeding ports 13 are opened on the left and right sides thereof. A pallet 14 that allows the circulation of cold air is placed on the bottom wall in the cabinet, and a group of brown rice bags P can be stacked on the upper surface of the pallet 14 with a gap from the surrounding wall of the storage space 2. Generally, 30 kg of brown rice is accommodated in the brown rice bag P formed of a paper bag.

  In FIG. 2, the cooling unit 3 includes a compressor 17 and a condensing device 18 disposed in the upper right half of the storage body 1, an evaporator 19 and an evaporator fan 20 disposed above the partition block 11, and the like. The outer surfaces of these devices 17 to 20 are covered with a square box-shaped device room cover 21. A condenser fan 22 is disposed in front of the condenser device 18, and a group of air inlets are opened in the front wall of the device chamber cover 21 that faces the fan 22, and the device chamber cover 21 that faces the compressor 17. The rear side is open. An operation panel 23 is disposed on the front wall of the equipment room cover 21, and a power switch, an operation mode switch, a temperature indicator, and the like are provided on the panel 23. In addition, a control unit (not shown) that controls the operating state of the cooling unit 3 and the heating structure 5 is disposed inside the equipment room cover 21.

  In order to divide the storage space 2 into a plurality of sections, a shelf column (vertical frame) 30 made of a hollow strip is fixed to the inner peripheral wall of the inner box 7 in a vertically long posture, and a rectangular shelf 31 that is long on the left and right. Are assembled to the shelf column 30 so that the vertical position can be changed. In this embodiment, shelf pillars 30 are arranged at four positions on the left and right walls of the inner box 7 and on the left and right of the inner back wall of the inner box 7, and the interior of the storage space 2 is vertically moved by one shelf 31. It shows the case where it is divided into two rooms. In FIG. 1, the shelf column 30 has a hat shape including a pair of seat walls 32 fixed to the inner peripheral wall of the inner box 7, and a bulging wall 33 having a trapezoidal cross section formed by bulging from the pair of seat walls 32. It consists of a strip of cross section. As shown in FIG. 5, a latching groove 35 for engaging and disengaging the latching metal 34 is formed in a multistage shape on the protruding end surface of the bulging wall 33.

  As shown in FIG. 2, the shelf 31 is configured as a breathable net panel, and is horizontally supported by four hooks 34 (see FIG. 5) engaged with the hook groove 35. Yes. In a state where the side of the shelf wall 32 of the shelf column 30 (the side of the opening surface) is fixed to the inner box 7, an air passage 36 is defined between the bulging wall 33 and the peripheral wall of the inner box 7. As shown in FIG. 6, the air passage 36 communicates with the storage space 2 at the lower end inlet 37 and the upper end outlet 38 of the shelf column 30, and at the same time, through the latching groove 35 to which the latch fitting 34 is not engaged. Via the storage space 2. The vertical length of the shelf column 30 is set to be smaller than the inner height of the storage space 2, and the inlet 37 and the outlet 38 face the bottom wall and the ceiling wall of the storage space 2 with an appropriate amount of space therebetween. ing.

  The heating structure 5 includes a heater unit 41 arranged on the wall surface of the inner peripheral wall of the inner box 7 facing the shelf column 30 on the heat insulating material side, and a heat radiating wall 42 that releases heat of the unit 41 toward the air passage 36. And the air passage 36. In this embodiment, as shown in FIG. 3, the heating column 5 is provided on the left and right walls of the inner box 7, and the heating structure 5 is provided on the left column 30 toward the inner back wall of the inner box 7. did. The heat radiating wall 42 is composed of the wall surface of the inner box 7 facing the bulging wall 33 and is exposed to the air passage 36. When the heat radiating wall 42 is exposed to the air passage 36 in this manner, the air in the air passage 36 can be directly heated by the heat radiating wall 42, so that the air in the air passage 36 is effective without heat loss. Can be heated. Incidentally, when the shelf column 30 is formed of a hollow strip having a quadrangular cross section, the heat of the heater unit 41 is fixed to the inner box 7 (corresponding to a heat radiating wall) and the inner wall is in close contact with the wall. Heat loss is caused by the amount of heat that is conducted to the air in the air passage 36 through the inner peripheral wall of the box 7.

  As shown in FIG. 4, the heater unit 41 includes a pair of vertically long U-shaped heater bodies 43 arranged along the shelf columns 30 and a pair of holders fixedly attached to the heat radiating wall 42 to hold and fix the heater bodies 43. It consists of heater shape plates 44 and 45. A shape retaining groove 46 for accommodating the heater body 43 is formed in one of the heater retaining plates 44, and the other heater retaining plate 45 is formed in a flat plate shape so as to block the shape retaining groove 46. 43 is in close contact with the heat radiation wall 42. According to such a heater unit 41, the heat of the heater body 43 can be effectively conducted to the heat radiating wall 42 via the heater shape plate 45, and the air in the air passage 36 can be efficiently heated by the heat radiating wall 42.

  The total heat generation amount of the three heater units 41 is adjusted to be large or small according to the volume of the storage space 2, but in this embodiment, when the volume of the storage space 2 is 805 liters, the total heat generation of the three heater units 41 The amount was 50.85 Kcal. Moreover, the capacity | capacitance of each heater main body 43 was set to 20 W and a low capacity | capacitance so that the temperature of the thermal radiation surface side of the thermal radiation wall 42 might not exceed 62 degreeC. In this way, if the heat generation amount of the heater body 43 is small, there is no need to provide a temperature fuse corresponding to each heater body 43. Therefore, the structure of the heating structure 5 is simplified correspondingly, and the heating structure Overall cost can be reduced. Note that the capacity of the heater body 43 is preferably adjusted according to the number of heater units 41 arranged, and the capacity of the heater body 43 when the number of heater units 41 is large may be 10 W to less than 20 W. Conversely, when the number of heater units 41 is less than 4, the capacity of the heater body 43 may be 20 W or more and less than 40 W.

  In order to effectively heat the air in the air passage 36 by the heater unit 41, the width B1 of the straight portion of the heater body 43 is set smaller than the maximum width B2 of the air passage 36 as shown in FIG. . In this embodiment, when the width B1 is 40 mm, the maximum width B2 is less than 68 mm, and the depth b of the air passage 36 is 15 mm. According to such a heating structure 5, the heat of the heater body 43 can be prevented from being conducted to the wall portion other than the heat radiating wall 42, and the air in the air passage 36 can be effectively heated by the heat of the heater body 43. .

  Since the heating air in the air passage 36 heated by the heat radiating wall 42 has a specific gravity smaller than the air positioned near the outer periphery of the shelf column 30 and the inner surface of the bulging wall 33, It flows in the air passage 36 toward the outlet 38. That is, by utilizing the fact that the specific gravity of the heated air in the air passage 36 is reduced, the heated air is flow-guided to the outlet 38 by the shelf column 30, and the chimney effect by the shelf column 30 is also added to vigorously from the outlet 38. Can be released. At this time, as the heated air flows upward in the air passage 36, relatively low-temperature air staying near the bottom wall of the storage space 2 flows into the air passage 36 from the inlet 37 and dissipates heat. After being heated by the heat released from the wall 42, it flows toward the outlet 38, so that a circulating airflow is formed inside and outside the shelf column 30.

  In addition, since the air passage 36 communicates with the storage space 2 through the latching groove 35, a part of the air around the shelf column 30 passes through the latching groove 35 to which the latching metal fitting 34 is not attached. The air flows into the air passage 36, receives heat from the heat radiating wall 42, flows toward the outlet 38, and merges with the previous circulating airflow. Therefore, in addition to the air below the inlet 37 of the air passage 36, the air around the shelf column 30 can also flow into the air passage 36 and be released from the outlet 38 while being heated by the heat radiating wall 42. Stirring of the air in the storage space 2 can be further promoted to heat the air in the storage space 2 evenly.

  In each shelf column 30 in which the heating structure 5 is assembled, the air in the air passage 36 is heated by the heat released from the heat radiating wall 42 exposed to the air passage 36. Heating can be performed gently, and the temperature of the seat wall 32 and the bulging wall 33 of the shelf column 30 surrounding the heat radiating wall 42 can be prevented from rising to near the heat generation temperature of the heater body 43. Further, after the relatively low temperature air staying in the vicinity of the bottom wall of the storage space 2 is heated by the heat radiating wall 42, it flows along the air passage 36 due to the specific gravity difference with the surrounding air and is discharged from the outlet 38. Therefore, the stirring of the air in the storage space 2 can be promoted by the convection action of the heated air, and the storage space 2 can be heated uniformly.

  Since the heater units 41 having the low-capacity heater main bodies 43 are arranged in a distributed manner corresponding to the respective shelf columns 30 arranged at three locations, the outlets 38 of the respective shelf columns 30 are respectively located in the upper center of the storage space 2. Heated air can be released. Therefore, stirring of the air in the storage space 2 can be further promoted to warm the storage space 2 evenly. When a large amount of brown rice bags P are stored in the storage space 2, the amount of circulating air is reduced, so that the air temperature in the storage space 2 can be increased in a relatively short time. Incidentally, when the heater main body 43 is composed of a heater having a relatively large capacity of 50 to 60 W, the total heat amount of the heater unit 41 becomes larger than necessary, so that the heater unit 41 has one or two heater units. Can only be placed in Therefore, it becomes difficult to circulate while heating the air in the storage space 2 evenly, and the air in the storage space 2 is likely to be uneven in temperature.

  The low temperature storage sets the internal temperature of the storage space 2 to an arbitrary temperature within the range of 2 to 15 ° C., and controls the operation state of the cooling unit 3 with the control unit so that the set temperature can be maintained. Further, in the season when the outside air temperature becomes low, the operation of the cooling unit 3 is stopped and the heating structure 5 is operated to prevent the internal temperature of the storage space 2 from dropping below the freezing point. In order to detect the internal temperature of the storage space 2, a temperature sensor 47 is disposed on the ceiling wall of the inner box 7. For example, when the air temperature in the storage space 2 is 2 ° C. or less and one hour has passed since the compressor 17 constituting the cooling unit 3 stopped, the control unit operates the heater unit 41 of the heating structure 5. This prevents the air temperature in the storage space 2 from dropping below the freezing point. According to such a low temperature storage, it can prevent that the brown rice bag P accommodated in the storage space 2 is exposed to the temperature below freezing point, and can prevent that the taste of brown rice is impaired. The operating condition of the heater unit 41 is an example, and the operating condition of the heater unit 41 should be changed according to changes in the air temperature or the outside air temperature in the storage space 2.

  For example, when the outside air temperature of the place where the low temperature storage is installed is minus 2 ° C., the heat radiating wall 42 is heated by operating the heater unit 41 when the operating condition of the previous heater unit 41 is satisfied. However, the temperature of the heat radiating surface of the heat radiating wall 42 is only 31.7 ° C. at the maximum. Therefore, air of 2 ° C. or less is heated with heat released from the heat radiating wall 42, and air heated to about 25 ° C. is discharged into the storage space 2 from the outlet 38 of the air passage 36. It is possible to prevent the air temperature from dropping below the freezing point. The operation of the heater unit 41 is stopped when the air temperature in the storage space 2 rises to 5 ° C., and thereafter, the heater unit 41 is maintained in a stopped state until the operation condition of the heater unit 41 is satisfied again. By operating the heater unit 41 as described above, it is possible to prevent the air temperature in the storage space 2 from dropping below the freezing point and to eliminate the loss of the taste of brown rice. In this embodiment, since the heating structure 5 can be configured by using the existing shelf column 30 for the vertical frame body, the internal structure of the low-temperature storage is simplified compared to the case where the vertical frame body is provided separately from the shelf column 30. The cost required for manufacturing can be reduced accordingly.

  In the above-described embodiment, the configuration in which the four vertical frame bodies 30 are provided in the inner box 7 has been described. However, the number of the vertical frame bodies 30 is not limited thereto, and for example, when the volume of the storage space 2 is large. Can adopt a configuration in which five or more vertical frames 30 are provided in the inner box 7. Further, in the above embodiment, the heating structure 5 is provided only in three vertical frame bodies 30 among the four vertical frame bodies (shelf columns) 30, but in all four vertical frame bodies 30, A heating structure 5 may be provided. The vertical frame 30 can be formed of a hollow strip having a C-shaped cross section or a quadrangular cross section, or a strip having a U-shaped cross section or a semicircular cross section. When the vertical frame 30 is formed of a hollow strip having a C-shaped cross section or a quadrangular cross section, the inner wall facing the peripheral wall of the hollow strip fixed to the inner box 7 or the shelf column 30 A part of the inner peripheral wall 7 functions as the heat radiating wall 42. For example, a circulation fan that promotes air agitation may be provided on the ceiling wall of the storage space 2 so that the circulation fan is activated at the same time as the heater unit 41 is activated.

DESCRIPTION OF SYMBOLS 1 Storage body 2 Storage space 3 Cooling unit 4 Door 5 Heating structure 6 Outer box 7 Inner box 8 Insulation material 30 Vertical frame (shelf column)
32 seat wall 33 bulging wall 34 latching bracket 35 latching groove 36 air passage 37 inlet 38 outlet 41 heater unit 42 heat radiating wall 43 heater body 44/45 heater shape plate

Claims (7)

A storage body (1) configured as a heat insulating box with an outer box (6) and an inner box (7), and a heat insulating material (8) filled between both boxes (6, 7), and a storage body (1) And a cooling unit (3) for supplying cold air to the storage space (2) partitioned by the storage space (2) and a freezing prevention heating structure (5) for heating the air in the storage space (2). And
The vertical frame (30) is fixed in a vertically long posture at a plurality of locations on the inner peripheral wall of the inner box (7).
The vertical frame (30) is formed of a hollow strip provided with an air passage (36) therein, and the outlet (38) and the inlet (37) formed by the air passage (36) above and below the vertical frame (30). ) Through the storage space (2),
The heating structure (5) has a heater unit (41) arranged on the heat insulating material side wall of the inner peripheral wall of the inner box (7) facing the vertical frame (30), and heat of the unit (41) is air A low-temperature storage comprising a heat radiating wall (42) that discharges toward the passage (36) and an air passage (36). The vertical frame (30) is formed of a strip provided with a bulging wall (33), and the opening surface side is fixed to the inner box (7),
The low-temperature storage according to claim 1, wherein the heat dissipating wall (42) provided on the inner peripheral wall of the inner box (7) facing the bulging wall (33) is exposed to the air passage (36). The heater unit (41) includes a U-shaped heater body (43) which is arranged along the heat radiation wall (42) and has a low capacity and is long vertically.
The low-temperature storage according to claim 1 or 2, wherein the heater units (41) are arranged in a distributed manner corresponding to the vertical frames (30) arranged at a plurality of locations on the peripheral wall of the inner box (7). The heater unit (41) includes a heater body (43) and a pair of heater shape plates (44, 45) for sandwiching and fixing the body (43).
Of the two heater retaining plates (44, 45), one heater retaining plate (44) has a U-shaped retaining groove (46) for accommodating the heater body (43), and the other The low temperature storage according to claim 3, wherein the heater shape retaining plate (45) is formed in a flat plate shape and is in close contact with the heat radiating wall (42) in a state of closing the shape retaining groove (46). The shelf column (30) is fixed in a vertically long position at a plurality of locations on the inner peripheral wall of the inner box (7), and the shelf (31) is assembled so that the vertical position of the shelf column (30) can be changed.
The cold storage according to any one of claims 1 to 4, wherein the shelf column (30) also serves as the vertical frame. A latching groove (35) for a latch fitting (34) for supporting the shelf (31) is formed in a multistage shape on the bulging wall (33) of the shelf column (30),
The cold storage according to claim 5, wherein the air passage (36) communicates with the storage space (2) through the hooking groove (35).   When the air temperature in the storage space (2) is 2 ° C. or less and one hour has passed since the compressor (17) constituting the cooling unit (3) was stopped, the heater unit of the heating structure (5) The cold storage according to any one of claims 1 to 6, wherein (41) is activated.

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