JP6765062B2 - Cold storage device - Google Patents

Description

The present disclosure relates to a cold storage device.

Conventionally, a cold roll box equipped with a cold storage device is known. In the cold roll box, for example, an article such as food is loaded and transported on a loading platform of a delivery vehicle in a state of being stored inside the cold roll box.

For example, Patent Document 1 describes a cold roll box including a cold storage solvent, a storage unit, a temperature detection unit, a cold storage amount calculation unit, and a display unit. In the cold storage solvent, the additive concentration is adjusted so as to have a predetermined temperature gradient characteristic between the freezing start temperature and the freezing end temperature. The freezing start temperature of the cold storage solvent is, for example, about −7 ° C., and the freezing end temperature of the cold storage solvent is about −22 ° C. The storage unit stores data related to the temperature gradient characteristic. The temperature detection unit detects the temperature of the cold storage solvent. The cold storage amount calculation unit obtains the cold storage amount based on the detected temperature obtained from the temperature detection unit and the data related to the temperature gradient characteristic obtained from the storage unit. The display unit displays the amount of cold storage obtained by the cold storage amount calculation unit.

JP-A-7-318215

The cold storage device described in Patent Document 1 has room for improvement from the viewpoint of improving the accuracy of the displayed cold storage amount while efficiently keeping the article cold. Therefore, the present disclosure provides a cold storage device that can efficiently keep the article cold and is advantageous for displaying the cold storage amount with high accuracy.

This disclosure is
A wall having an inner peripheral surface including a bottom surface and a first side surface extending upward from the peripheral edge of the bottom surface, and defining a cold storage chamber by the inner peripheral surface.
Each of the cold storage bodies is housed, and is a plurality of boxes arranged at predetermined intervals along the first direction in the cold storage chamber, and among the plurality of boxes, the most on the first side surface. Multiple boxes, including the first box, which is a close box,
A blower that creates a flow of air that passes through a space defined between adjacent boxes of the plurality of boxes.
The first temperature sensor arranged in the first box body is included, and the first temperature sensor is arranged in different boxes along a straight line, and the surface temperature of the box body, the surface temperature of the cold storage body, or the said Multiple temperature sensors that detect the temperature inside the cold storage body,
A controller that generates state information indicating the amount of cold storage of the cold storage body based on the temperature detected by at least one of the plurality of temperature sensors and outputs the state information.
A display device for displaying the state information output by the controller, and the like.
Provide a cold storage device.

The above-mentioned cold storage device is advantageous for displaying a cold storage amount having high accuracy while being able to efficiently keep the article cold.

Configuration diagram schematically showing the cold storage device according to the first embodiment Perspective view illustrating the arrangement of a plurality of boxes in the cold storage chamber Sectional view of the cold storage device along the line III-III of FIG. Cross-sectional view showing a cold storage device according to a modified example Cross-sectional view of the box along the VV line of FIG. Flow chart showing an example of the operation of the cold storage device Graph showing an example of the detection result by the temperature sensor Graph showing another example of the detection result by the temperature sensor

<Knowledge based on the study by the present inventors>
The present inventors have studied for efficiently keeping an article cold in a cold roll box equipped with a cold storage device. As a result, the present inventors have found that it is effective to operate a blower inside the cold storage device to generate an air flow and use the air flow cooled by the cold storage body to keep the article cold. It was. In this case, the present inventors have newly found that the temperature of the cold storage body may fluctuate in the direction of the air flow during the period when the air flow is generated by the operation of the blower. Based on this, the present inventors have newly found that if the cold storage amount of the cold storage body can be determined in consideration of the variation in the temperature of the cold storage body in the air flow direction, the cold storage amount with high accuracy can be displayed. Therefore, the inventors of the present disclosure have developed a technique of detecting a temperature such as the surface temperature of a cold storage body at a plurality of positions in the air flow direction generated by the operation of the blower and determining the cold storage amount based on the detection result. I devised a new one.

However, depending on the usage status of the cold storage device, the cold storage device may be left for a specific period while the blower is stopped. When the blower is operating, most of the cold heat of the cold storage body is consumed by the air flow, but when the blower is stopped, most of the cold heat of the cold storage body is the heat of the external space of the cold storage device. Is consumed by traveling down the wall that defines the cold storage room. Therefore, it is difficult to display the amount of cold storage with high accuracy only by considering the variation in the temperature of the cold storage body in the air flow direction. Therefore, the present inventors have repeatedly studied day and night on a technique capable of displaying the amount of cold storage with high accuracy even when the blower is stopped. As a result, the present inventors devised the arrangement of a plurality of temperature sensors in a plurality of boxes each containing a cold storage body to obtain a highly accurate cold storage amount even when the blower is stopped. I found that it can be displayed. The cold storage device of the present disclosure has been devised based on such new findings of the present inventors. It should be noted that the above findings are based on the studies of the inventors and are not self-identified as prior art.

The first aspect of the present disclosure is
A wall having an inner peripheral surface including a bottom surface and a first side surface extending upward from the peripheral edge of the bottom surface, and defining a cold storage chamber by the inner peripheral surface.
Each of the cold storage bodies is housed, and is a plurality of boxes arranged at predetermined intervals along the first direction in the cold storage chamber, and among the plurality of boxes, the most on the first side surface. Multiple boxes, including the first box, which is a close box,
A blower that creates a flow of air that passes through a space defined between adjacent boxes of the plurality of boxes.
The first temperature sensor arranged in the first box body is included, and the first temperature sensor is arranged in different boxes along a straight line, and the surface temperature of the box body, the surface temperature of the cold storage body, or the above. Multiple temperature sensors that detect the temperature inside the cold storage body,
A controller that generates state information indicating the amount of cold storage of the cold storage body based on the temperature detected by at least one of the plurality of temperature sensors and outputs the state information.
A display device for displaying the state information output by the controller, and the like.
Provide a cold storage device.

According to the first aspect, the blower can generate a flow of air passing through a space defined between adjacent boxes of a plurality of boxes, so that the article can be efficiently kept cold. Further, a plurality of temperature sensors for detecting a temperature such as the surface temperature of the box body are arranged in different box bodies along a straight line. Therefore, the detection results by the plurality of temperature sensors reflect the influence of heat transferred from the external space of the cold storage device to the cold storage chamber through the first side surface. In particular, when the blower is stopped, most of the cold heat of the cold storage body is consumed by the heat of the external space of the cold storage device being transmitted through the wall defining the cold storage chamber. According to the first aspect, state information indicating the amount of cold storage of the cold storage body is generated based on the temperatures detected by the plurality of temperature sensors, and the state information is displayed on the display device. Therefore, it is possible to display the amount of cold storage with high accuracy even when the blower is stopped. In addition, the temperature detected by at least one of the plurality of temperature sensors is likely to be suitable for generating state information. As described above, the cold storage device according to the first aspect is advantageous in displaying the cold storage amount having high accuracy while being able to efficiently keep the article cold.

Patent Document 1 does not describe that an air flow is generated around the cold storage solvent by a blower, and does not describe that the temperature of the cold storage solvent is detected at a plurality of positions in the air flow direction. Furthermore, Patent Document 1 does not suggest any method for obtaining the amount of cold storage when the operating blower is stopped, and based on the description of Patent Document 1, the cold storage device according to the first aspect is provided. I can't come up with it.

In the second aspect of the present disclosure, in addition to the first aspect, when the total length of the plurality of boxes in the longitudinal direction is expressed as LT, each of the plurality of temperature sensors is the most upstream in the air flow direction. Provided is a cold storage device arranged in a region of less than LT / 2 from the end toward the downstream side in the air flow direction. When the operation of the blower causes an air flow that passes through the space defined between the boxes, the cold heat of the cold storage body located at the end of the box on the upstream side in the air flow direction has priority. It is consumed and the cold storage body located at its end is preferentially melted. On the other hand, the cold storage body located at the end of the box body on the downstream side in the air flow direction tends to remain in the solidified state until the end. It is desirable that the temperature detected by the temperature sensor referred to in the generation of the state information indicating the amount of cold storage when the blower is stopped reflects the temperature of the cold storage body in the molten state. This is because the heat transferred from the external space of the cold storage device through the first side surface to the cold storage chamber can be quantitatively evaluated by the sensible heat change of the cold storage body. According to the second aspect, it is highly possible that the temperature detected by the plurality of temperature sensors reflects the temperature of the cold storage body in the molten state immediately after the operating blower is stopped, and the amount of cold storage is advantageous. Can be decided.

In the third aspect of the present disclosure, in addition to the first aspect or the second aspect, the plurality of temperature sensors are adjacent to at least the first box body and the first box body in the plurality of boxes. Provided is a cold storage device arranged in a second box body which is a box body. According to the third aspect, the temperature detected by the temperature sensors arranged in the first box body and the second box body tends to rise soon after the operating blower is stopped. Therefore, based on the temperature detected by the temperature sensor arranged in the second box, it is easy to generate state information indicating the amount of cold storage at an early stage after the blower is stopped.

In the fourth aspect of the present disclosure, in addition to the first or second aspect, the number of the plurality of boxes is three, and among the plurality of boxes, the first box and the first box are described. Provided is a cold storage device in which the temperature sensor is arranged only in a second box body which is a box body adjacent to one box body. According to the fourth aspect, the temperature sensor is arranged only in the first box body and the second box body, and the temperature sensor is not arranged in the box body farthest from the first side surface among the plurality of box bodies. .. Therefore, the number of temperature sensors arranged in a plurality of boxes can be reduced.

In the fifth aspect of the present disclosure, in addition to any one aspect of the first to third aspects, the number of the plurality of boxes is 2n or 2n + 1 when n is defined as a natural number of 2 or more. The plurality of temperature sensors are derived from a box body arranged between the m-th order box body, which is the box body n + 1st closest to the first side surface among the plurality of box bodies, and the first box body. Provided is a cold storage device arranged only in at least one box body selected and the first box body. According to the fifth aspect, the number of temperature sensors arranged in the plurality of boxes can be reduced to half (n) or less of the number of the plurality of boxes. In addition, by considering the symmetry of the temperature distribution of the cold storage body in a plurality of boxes, the amount of cold storage of the cold storage body can be increased without significantly impairing the accuracy by the temperature sensors of less than half the number of the number of the cold storage bodies. The indicated state information can be generated.

In the sixth aspect of the present disclosure, in addition to the fifth aspect, the plurality of temperature sensors are arranged in succession of n or less boxes including the first box in the plurality of boxes. Provide a cold storage device, which is located only in. According to the sixth aspect, as in the fifth aspect, it is possible to generate state information indicating the amount of cold storage of the cold storage body by using n or less temperature sensors without significantly impairing the accuracy. It is desirable that the temperature detected by the temperature sensor referred to in the generation of the state information indicating the amount of cold storage reflects the temperature of the cold storage body in the molten state and the temperature rise is not saturated. When a plurality of temperature sensors are arranged in n or less boxes in which a plurality of temperature sensors are continuously arranged as in the sixth aspect, at least one of the temperatures detected by the plurality of temperature sensors is likely to fall within a desirable range. .. As a result, it is easy to seamlessly generate a cold storage amount with high accuracy over a long period of time.

In the seventh aspect of the present disclosure, in addition to any one aspect of the first to sixth aspects, the straight line is a straight line parallel to the longest side of the first box and perpendicular to the height direction. A cold storage device is provided. According to the seventh aspect, even when the blower that causes the air flow along the longest side of the first box is stopped, the cold storage amount with high accuracy can be displayed.

In the eighth aspect of the present disclosure, in addition to any one aspect of the first to seventh aspects, the first direction is a direction perpendicular to the first side surface, and each of the plurality of boxes. The longest side in the above extends in a direction parallel to the first side surface, and the straight line is a straight line perpendicular to the first side surface, providing a cold storage device. According to the seventh aspect, the area of the first side surface can be reduced, and the amount of heat transferred from the external space of the cold storage device to the cold storage chamber through the first side surface can be reduced. In addition, when the air flow is generated along the longest side of each of the plurality of boxes, the length of the air flow path becomes long, and it is easy to sufficiently cool the air.

In the ninth aspect of the present disclosure, in addition to any one aspect of the first to eighth aspects, the blower causes the air flow in a second direction parallel to the bottom surface and the first side surface. Each of the plurality of temperature sensors provides a cold storage device which is arranged at an upstream end portion of the plurality of boxes in the direction of the air flow. According to the eighth aspect, as in the second aspect, there is a possibility that the temperature detected by the plurality of temperature sensors reflects the temperature of the cold storage body in the molten state immediately after the operating blower is stopped. It is high and the amount of cold storage can be determined advantageously.

In the tenth aspect of the present disclosure, in addition to any one aspect of the first to ninth aspects, when the total length of each of the plurality of boxes in the longitudinal direction is expressed as LT, each of the plurality of temperature sensors Provides a cold storage device arranged in a region of LT / 3 or less from the most upstream end in the air flow direction toward the downstream side in the air flow direction.

The eleventh aspect of the present disclosure is arranged along the air flow direction in at least one of the plurality of boxes in addition to any one of the first to tenth aspects. The controller further includes a plurality of temperature sensors for detecting the surface temperature of the box body, the surface temperature of the cold storage body, or the temperature inside the cold storage body, and the controller is arranged along the straight line. Based on the temperature detected by at least one of the temperature sensors of the above and the temperature detected by at least one of the plurality of temperature sensors arranged along the flow direction of the air. To provide a cold storage device that generates the state information and outputs the state information to the display device. According to the eleventh aspect, the cold storage amount of the cold storage body when the blower is operating can be advantageously obtained from the detection results of the plurality of temperature sensors arranged along the air flow direction.

The twelfth aspect of the present disclosure is in addition to any one aspect of the first aspect to the eleventh aspect.
The controller generates state information indicating the amount of cold storage of the cold storage body based on the temperature T1 and the temperature T2 detected by the specific temperature sensors included in the plurality of temperature sensors arranged along the straight line. ,
The temperature T1 is obtained by the specific temperature sensor at the first time, and has a value larger than the temperature at which the heat storage material changes from solid to liquid.
The temperature T2 is acquired by the specific temperature sensor at the second time when a predetermined time has elapsed from the first time, and has a value lower than the temperature of the external space of the cold storage device. I will provide a.

According to the twelfth aspect, the specific temperature sensor measures the temperature rise due to the sensible heat change. Therefore, the amount of heat input flowing from the external space can be easily obtained by using the temporal change of the temperature detected by the specific temperature sensor.

In addition to the twelfth aspect, the thirteenth aspect of the present disclosure
The temperature T1 and the temperature T2 provide a cold storage device that is acquired by the specific temperature sensor when the blower is stopped.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The following description relates to an example of the present invention, and the present invention is not limited thereto. In the attached drawings, the X-axis direction, the Y-axis direction, and the Z-axis direction indicate the same direction. The X-axis, Y-axis, and Z-axis are orthogonal to each other. Also, the components described without reference to the X-axis, Y-axis, and Z-axis can be placed in appropriate positions as needed.

As shown in FIGS. 1 to 3, the cold storage device 100 includes a wall 65, a plurality of boxes 11, a blower 20, a plurality of temperature sensors 12, a controller 30, and a display device 40. As shown in FIG. 2, the wall 65 has an inner peripheral surface including a bottom surface 61 and a first side surface 62. The first side surface 62 extends upward (Z-axis positive direction) from the peripheral edge of the bottom surface 61. The wall 65 defines the cold storage chamber 15 by an inner peripheral surface including a bottom surface 61 and a first side surface 62. As shown in FIG. 3, a cold storage body 10 is housed in each of the plurality of box bodies 11, and the plurality of box bodies 11 are spaced apart from each other along a first direction (Y-axis direction) in the cold storage chamber 15. It is arranged in. The plurality of boxes 11 include the first box 11a, which is the box closest to the first side surface 62 among the plurality of boxes 11. The blower 20 creates a flow of air passing through a space defined between the adjacent box bodies 11 of the plurality of box bodies 11. The arrows in FIGS. 2 and 3 conceptually indicate the flow of air generated by the operation of the blower 20. As shown in FIG. 3, the plurality of temperature sensors 12 include the first temperature sensor 12a arranged in the first box body 11a, and are arranged in different box bodies 11 along a straight line L (virtual straight line). Has been done. In addition, the plurality of temperature sensors 12 detect the surface temperature of the box body 11, the surface temperature of the cold storage body 10, or the temperature inside the cold storage body 10. The controller 30 generates state information indicating the amount of cold storage of the cold storage body 10 based on the temperature detected by at least one of the plurality of temperature sensors 12, and outputs the state information. The display device 40 displays the state information output by the controller 30. In the present specification, "the temperature sensor 12 is arranged on the box body 11" means that the temperature sensor 12 is in contact with the outer peripheral surface of the box body 11 or the outer peripheral surface of the box body 11. , Means that it is located in the internal space of the box body 11. Further, "the plurality of temperature sensors 12 are arranged along the straight line L" naturally includes the case where the plurality of temperature sensors 12 are arranged on the straight line L. In addition, "the plurality of temperature sensors 12 are arranged along the straight line L" means that at least one of the X-axis direction and the Z-axis direction is used so as not to affect the accuracy of the generated state information. This includes the case where the temperature sensor 12 is arranged so as to deviate from the straight line L in one direction.

As shown in FIGS. 2 and 3, the operation of the blower 20 causes a flow of air passing through a space defined between the adjacent box bodies 11 of the plurality of box bodies 11. Therefore, the air cooled through this space is used to keep the article cool. As a result, the article can be efficiently kept cold. The detection results of the plurality of temperature sensors 12 arranged in different boxes 11 along the straight line L are affected by the heat transferred from the external space of the cold storage device 100 to the cold storage chamber 15 through the first side surface 62. .. In particular, when the blower 20 is stopped, most of the cold heat of the cold storage body 10 is consumed by transferring the heat of the external space of the cold storage device 100 to the cold storage chamber 15 through the wall 65 defining the cold storage chamber 15. Will be done. The cold storage device 100 generates state information indicating the amount of cold storage of the cold storage body 10 based on the temperatures detected by the plurality of temperature sensors 12 and displays it on the display device 40. Therefore, even when the blower 20 is stopped, the amount of cold storage with high accuracy can be displayed. As described above, the cold storage device 100 is advantageous for displaying the cold storage amount having high accuracy while being able to efficiently keep the article cold.

As shown in FIG. 3, each of the plurality of temperature sensors 12 is arranged, for example, at the upstream end of each of the plurality of boxes 11 in the direction of air flow (positive direction on the X-axis). In addition, when the total length in the longitudinal direction of each of the plurality of boxes 11 is expressed as LT, the "upstream end" means LT from the most upstream end in the air flow direction toward the downstream side in the air flow direction. Means an area less than / 2. Each of the plurality of temperature sensors 12 has an LT / 3 or less region, an LT / 4 or less region, or an LT / 5 or less region from the most upstream end in the air flow direction toward the downstream side in the air flow direction. It may be arranged in the area.

As shown in FIGS. 2 and 3, for example, the blower 20 has a second direction (X-axis positive direction) parallel to the bottom surface 61 and the first side surface 62 in a space defined between adjacent boxes 11. Creates a flow of air. In this case, each of the plurality of temperature sensors 12 is arranged at the upstream end of each of the plurality of boxes 11 in the direction of air flow (positive direction on the X-axis).

When an air flow is generated by the operation of the blower 20, the cold heat of the cold storage body 10 located at the end of the box body 11 on the upstream side in the air flow direction (second direction: positive direction of the X axis) has priority. The cold storage body 10 located at the end thereof is preferentially melted. On the other hand, the cold storage body 10 located at the end of the box body 11 on the downstream side in the air flow direction (second direction: positive direction on the X-axis) tends to remain in the solidified state until the end. It is desirable that the temperature detected by the temperature sensor referred to in the generation of information indicating the amount of cold storage when the blower 20 is stopped reflects the temperature of the cold storage body 10 in the molten state. This is because the heat transferred from the external space of the cold storage device 100 through the first side surface 62 to the cold storage chamber 15 can be quantitatively evaluated by the sensible heat change of the cold storage body 10. Therefore, it is highly possible that the temperature detected by the plurality of temperature sensors 12 reflects the temperature of the cold storage body 10 in the molten state immediately after the operating blower 20 is stopped. Therefore, it is easy to detect the sensible heat change of the cold storage body 10 by the plurality of temperature sensors 12, and the heat transferred to the cold storage chamber 15 can be quantitatively evaluated.

As shown in FIG. 3, for example, the plurality of temperature sensors 12 is a second box body 11b which is a box body adjacent to at least the first box body 11a and the first box body 11a among the plurality of box bodies 11. Is located in. The temperature of the cold storage body 10 housed in the first box body 11a and the second box body 11b tends to rise soon after the operating blower 20 is stopped. Therefore, based on the temperature detected by the temperature sensor 12 arranged in the second box body 11b, the controller 30 can easily generate the state information indicating the cold storage amount at an early stage after the blower 20 is stopped.

The number of the plurality of boxes 11 arranged in the cold storage chamber 15 is not particularly limited, but is based on parameters such as the amount of cold heat required for the cold storage device 100, the dimensions of the cold storage body 10, and the height of the cold storage chamber 15. Is properly determined. Further, the number of the plurality of boxes 11 arranged in the cold storage chamber 15 is preferably determined so that a sufficient heat exchange area with the box 11 with the air flowing through the cold storage chamber 15 is secured. Further, the number of the plurality of boxes 11 arranged in the cold storage chamber 15 preferably keeps the pressure loss generated in the air flow in the air flow path formed between the boxes 11 at an appropriate size. It is decided to hang down.

As shown in FIG. 3, for example, the number of the plurality of boxes 11 is 2n when n is a natural number of 2 or more (n = 4 in this example). In this case, the plurality of temperature sensors 12 are, for example, only at least one box body and the first box body 11a selected from the box bodies 11 arranged between the m-th order box body 11m and the first box body 11a. Is located in. The m-th order box body 11m is the box body 11 closest to n + 1th from the first side surface 62 among the plurality of box bodies 11. In other words, among the plurality of boxes 11, the terminal box 11z, which is the box 11 farthest from the first side surface 62, and the box arranged between the terminal box 11z and the m-th order box 11m, The temperature sensor 12 is not arranged on the m-th order box body 11m. As described above, when the number of boxes included in the plurality of boxes 11 is 2n, the number of temperature sensors 12 can be reduced to half (n) or less of the number of boxes 11. When the blower 20 is stopped, the temperature distribution of the cold storage bodies housed in the plurality of boxes 11 often has symmetry. By considering the symmetry of this temperature distribution, it is possible to generate state information indicating the amount of cold storage of the cold storage body 10 without significantly impairing the accuracy by the temperature sensors 12 having a number less than half the number of the plurality of boxes 11. .. In addition, in this specification, a "natural number" means a positive integer (1, 2, 3, ...).

As shown in FIG. 4, for example, the number of the plurality of boxes 11 may be 2n + 1 when n is a natural number of 2 or more (n = 4 in this example). In this case as well, the plurality of temperature sensors 12 are, for example, at least one box body and the first box body 11a selected from the box bodies 11 arranged between the m-th order box body 11m and the first box body 11a. It is located only in.

As shown in FIGS. 3 and 4, among the plurality of boxes 11, the plurality of temperature sensors 12 are arranged only in the continuously arranged n or less boxes 11 including the first box 11a. There is. In this case as well, the n or less temperature sensors 12 can generate state information indicating the amount of cold storage of the cold storage body 10 without significantly impairing the accuracy. It is desirable that the temperature detected by the temperature sensor 12 referred to in the generation of the state information indicating the amount of cold storage reflects the temperature of the cold storage body 10 in the molten state and the temperature rise is not saturated. When a plurality of temperature sensors 12 are arranged in n or less boxes 11 which are continuously arranged, at least one of the temperatures detected by the plurality of temperature sensors 12 tends to fall within a desirable temperature range. As a result, it is easy to seamlessly generate a cold storage amount with high accuracy over a long period of time.

The number of the plurality of boxes 11 may be, for example, three. In this case, among the plurality of boxes 11, the temperature sensor 12 is arranged only in the first box 11a and the second box 11b, which is a box adjacent to the first box 11a. In other words, the temperature sensor 12 is not arranged in the box body farthest from the first side surface 62 among the plurality of box bodies 11. Therefore, the number of the plurality of temperature sensors 12 can be made smaller than the number of the plurality of boxes 11.

As shown in FIG. 5, the cold storage body 10 is formed, for example, by sealing the cold storage material 10a with a film container 10b. The cold storage body 10 can store cold heat in the form of latent heat, for example, by cooling and solidifying the liquid cold storage material 10a. The cold storage material 10a is not particularly limited, but is, for example, a mixture containing sodium chloride and water to which sodium chloride is added at a predetermined concentration. The absolute value of the difference between the crystal start temperature of the cold storage material 10a and the crystal end temperature of the cold storage material 10a is not particularly limited, but is, for example, 2 ° C. or less. The film forming the container 10b is, for example, a laminated film including an aluminum layer and two or more resin layers arranged on both sides of the aluminum layer in the thickness direction.

The longest side of each of the plurality of boxes 11 extends in a second direction (air flow direction: positive X-axis direction), for example, as shown in FIG. As a result, during the period in which the blower 20 is operating, the overall melting state of the cold storage body 10 tends to vary in the second direction. In addition, the period during which the air flow passes in the second direction through the space defined between the boxes 11 tends to be long, and the air guided to the space defined between the boxes 11 is surely. Easy to cool. In addition, since the pressure loss generated in the air flow flowing through the space defined between the boxes 11 is relatively large, the air is likely to be evenly guided to the plurality of spaces in which the air flow occurs. The box body 11 is not particularly limited, but has, for example, a rectangular parallelepiped outer shape elongated in the second direction as shown in FIG.

The straight line L is, for example, a straight line perpendicular to the direction parallel to the longest side (X-axis direction) and the height direction (Z-axis direction) of the first box body 11a.

As shown in FIG. 2, the first direction (Y-axis direction) is, for example, a direction perpendicular to the first side surface 62. In addition, the longest side of each of the plurality of boxes 11 extends in a direction parallel to the first side surface 62. Further, the straight line L is, for example, a straight line perpendicular to the first side surface 62. In this case, the area of the first side surface 62 tends to be small, and the amount of heat transferred from the external space of the cold storage device 100 to the cold storage chamber 15 through the first side surface 62 can be reduced. In addition, when the air flow is generated along the longest side of each of the plurality of boxes 11, the length of the air flow path becomes long, and it is easy to sufficiently cool the air.

The box body 11 may be formed of a plurality of parts that can be combined in the Y-axis direction in consideration of ease of assembly. The material forming the box 11 is not particularly limited, but is, for example, a metal or alloy such as aluminum. In this case, the cold heat of the cold storage body 10 is easily transmitted to the air flowing near the box body 11.

The temperature sensor 12 is not particularly limited, and is, for example, a contact type temperature sensor having a thermocouple or a thermistor or a non-contact type temperature sensor having a thermopile. The temperature sensor 12 preferably detects the surface temperature of the box body 11 or the surface temperature of the cold storage body 10 housed in the box body 11. In this case, since it is not necessary to install the temperature sensor 12 inside the cold storage body 10, leakage of the cold storage material 10a due to a poor seal in the cold storage body 10 is unlikely to occur. Further, even when the cold storage body 10 needs to be replaced, the installation work of the temperature sensor 12 can be simplified, or the installation work of the temperature sensor 12 can be eliminated.

The temperature sensor 12 is installed, for example, on the surface of the cold storage body 10 or the surface of the box body 11. In other words, the temperature sensor 12 is in contact with the surface of the cold storage body 10 or the surface of the box body 11. In this case, since a gap is hardly formed between the surface of the cold storage body 10 or the surface of the box body 11 and the temperature sensor 12, the temperature sensor is formed between the surface of the cold storage body 10 or the surface of the box body 11 and the temperature sensor 12. Foreign matter that hinders the temperature detection by 12 is unlikely to exist. Therefore, the surface temperature of the cold storage body 10 or the surface temperature of the box body 11 can be detected more reliably. For example, as shown in FIG. 5, the temperature sensor 12 is installed on the surface of the cold storage body 10.

As shown in FIG. 3, for example, a plurality of temperature sensors 13 are arranged in at least one of the plurality of boxes 11. The plurality of temperature sensors 13 are arranged along the second direction (air flow direction: X-axis positive direction). When one temperature sensor 12 included in the plurality of temperature sensors 12 is arranged in the box body in which the plurality of temperature sensors 13 are arranged, the temperature sensor 12 also serves as a part of, for example, the plurality of temperature sensors 13. You may be. Each of the plurality of temperature sensors 13 detects the surface temperature of the box body 11, the surface temperature of the cold storage body 10, or the temperature inside the cold storage body 10 in the same manner as the plurality of temperature sensors 12. The controller 30 provides state information based on, for example, the temperature detected by at least one temperature sensor among the plurality of temperature sensors 12 and the temperature detected by at least one temperature sensor among the plurality of temperature sensors 13. It may be generated. In this case, the controller 30 outputs the generated state information to the display device 40.

During the period in which the blower 20 is operating, the cold heat of the cold storage body 10 located at the end of the box 11 on the upstream side in the air flow direction (second direction) is preferentially consumed, and the cold heat is preferentially consumed at the end. The cold storage body 10 located is preferentially melted. On the other hand, the cold storage body 10 located at the end of the box body 11 on the downstream side in the air flow direction tends to remain in the solidified state until the end. Therefore, during the period in which the blower 20 is operating, the temperature detected by the temperature sensor 13 located upstream of the air flow is ahead of the temperature detected by the temperature sensor 13 located downstream of the air flow. It tends to rise above the melting point. As a result, state information indicating the amount of cold storage of the cold storage body 10 can be generated by utilizing the distribution state of the temperature detected by the plurality of temperature sensors 13 in the air flow direction. That is, the controller 30 generates state information indicating the amount of cold storage of the cold storage body 10 based on the temperatures detected by the plurality of temperature sensors 13 during the period when the blower 20 is operating. Therefore, even when the difference between the crystal start temperature of the cold storage material 10a and the crystal end temperature of the cold storage material 10a is relatively small, state information indicating the cold storage amount of the cold storage material 10 can be appropriately generated. If the difference between the crystal start temperature of the cold storage material 10a and the crystal end temperature of the cold storage material 10a is relatively small, for example, when the permissible range of the cold storage temperature allowed to keep the article cold is narrow, the cold storage body 10 is used. It can be used to your advantage. The controller 30 can determine, for example, the initial cold storage amount of the cold storage body 10 based on the temperatures detected by the plurality of temperature sensors 13 immediately after the blower 20 is stopped.

As shown in FIG. 3, a temperature sensor 12 is connected to the controller 30 so as to be able to communicate by wire or wirelessly. Further, although not shown, the temperature sensor 13 is also connected to the controller 30 so as to be able to communicate by wire or wirelessly. Therefore, information indicating the temperature detected by the temperature sensor 12 and the temperature sensor 13 is input to the controller 30. The controller 30 is configured as a computer including, for example, an interface for input / output of information, a computing device such as a CPU, a main storage device such as a memory, and an auxiliary storage device such as a hard disk drive. As described above, the controller 30 generates state information indicating the amount of cold storage of the cold storage body 10. As shown in FIG. 3, the controller 30 is connected to the display device 40 by a communication cable, and outputs state information indicating the amount of cold storage of the cold storage body 10 to the display device 40. The display device 40 is not particularly limited, but is, for example, a liquid crystal display or an organic EL display. The display device 40 is arranged, for example, on the outer peripheral surface of the housing of the cold storage device 100.

As shown in FIG. 1, the cold storage device 100 further includes, for example, a cold air duct 21, a floor plate 60, and a refrigeration cycle 70. The internal space including the cold storage chamber 15 of the cold storage device 100 is divided into a cold storage chamber 15 and a storage chamber 50 by a floor plate 60. For example, the cold storage chamber 15 is formed below the floor plate 60 (negative direction on the Z axis), and the storage chamber 50 is formed above the floor plate 60 (positive direction on the Z axis). The storage room 50 is a space for storing items that need to be kept cold, such as food. For example, a gap is formed between a part of the end of the floor plate 60 and the wall surface forming the storage chamber 50, and the cold storage chamber 15 and the storage chamber 50 communicate with each other through this gap.

The blower 20 is arranged inside, for example, the storage chamber 50. The blower 20 is arranged on the side surface of the storage chamber 50 near the ceiling surface of the storage chamber 50. The cold air duct 21 communicates the cold storage chamber 15 with the space behind the blower 20. When the blower 20 is activated, the air inside the cold storage chamber 15 passes through the space formed between the boxes 11. At this time, the air is cooled by the cold storage body 10. The cooled air is guided to the space behind the blower 20 through the inside of the cold air duct 21, and is blown out to the storage chamber 50 by the blower 20. As a result, the articles stored in the storage chamber 50 are kept cold. A part of the air inside the storage chamber 50 is guided to the cold storage chamber 15 through a gap formed between a part of the end of the floor plate 60 and the wall surface forming the storage chamber 50.

As shown in FIG. 1, the refrigeration cycle 70 includes an evaporator 71, a compressor 72, a condenser 73, and an expansion valve 74. The evaporator 71, the compressor 72, the condenser 73, and the expansion valve 74 are connected in an annular shape by a pipe so that the refrigerant passes in this order. The evaporator 71 is arranged in the cold storage chamber 15. For example, as shown in FIG. 5, a pipe defining the flow path of the refrigerant of the evaporator 71 is arranged in contact with the outer peripheral surface of the box body 11. In order to improve the heat transfer property between the pipe and the box body 11, for example, the pipe is pressed so as to come into contact with the outer peripheral surface of the box body 11 by a metal pressing member (not shown). The pipe that defines the flow path of the refrigerant of the evaporator 71 extends from the upstream end of the box body 11 to the downstream end along the second direction, bends at the downstream end, and faces the upstream end along the second direction. Is extending. The pipe that defines the flow path of the refrigerant of the evaporator 71 extends from the downstream end of the box body 11 to the upstream end of the box body 11 along the second direction, and bends at the upstream end of the box body 11 in the second direction. It may extend along the downstream end of the box 11.

When the refrigeration cycle 70 is operated, the cold storage body 10 is cooled by the refrigerant flowing through the evaporator 71. The temperature of the refrigerant in the evaporator 71 is lower than the freezing point of the cold storage material 10a. Therefore, the cold storage material 10a in the liquid state solidifies and cold heat is stored in the cold storage body 10. The refrigeration cycle 70 is used, for example, to store cold heat in the cold storage body 10 before keeping the article cold in the storage chamber 50. Further, the storage chamber 50 may be cooled by operating the blower 20 while operating the refrigerating cycle 70 and utilizing the cold heat of the refrigerant in the refrigerating cycle 70.

An example of the operation of the cold storage device 100 for generating the state information indicating the cold storage amount of the cold storage body 10 is shown. In this operation, for example, the blower 20 is operated to generate a flow of air passing through a space defined between the boxes 11, and the air cooled by the cold storage body 10 is circulated, and then the blower 20 is used. It is carried out when it is stopped. In some cases, this operation may be performed when the refrigerating cycle 70 is operated to store cold heat in the cold storage body 10 and then the blower 20 is not operated and the cold storage device 100 is left unattended.

When a predetermined condition is satisfied, the cold storage device 100 starts an operation for generating state information indicating the cold storage amount of the cold storage body 10. The predetermined condition includes that the blower 20 is stopped. The predetermined conditions include, for example, that the blower 20 that was operating has stopped, or that the refrigeration cycle 70 has stopped operating.

As shown in FIG. 6, in step S1, a plurality of temperature sensors 13 are used to detect the surface temperature of the box body 11, the surface temperature of the cold storage body 10, or the temperature inside the cold storage body 10. Next, in step S2, the controller 30 acquires information Da indicating the temperature detected by the plurality of temperature sensors 13 from the plurality of temperature sensors 13. Next, in step S3, the controller 30 determines the cold storage amount (initial cold storage amount Ci) in the cold storage bodies 10 of the plurality of boxes 11 immediately after the blower 20 is stopped or the refrigeration cycle 70 is stopped, based on the information Da. Determine and remember. For example, in the controller 30, the capacity of the cold storage body 10 represented by the temperature sensor 13 that detects a temperature below the first threshold value indicating that the cold storage body 10 is in a solidified state among the plurality of temperature sensors 13 is the cold storage body 10. The initial cold storage amount Ci is calculated based on the ratio of the above to the total capacity. When the cold storage amount of the cold storage body 10 immediately before the stop of the blower 20 or the stop of the refrigeration cycle 70 is stored in the controller 30, the processes of steps S1 to S3 may be omitted.

Next, in step S4, the surface temperature of the box body 11, the surface temperature of the cold storage body 10, or the temperature inside the cold storage body 10 is detected by using the plurality of temperature sensors 12. Next, in step S5, the controller 30 acquires and stores information Db indicating the temperature detected by the plurality of temperature sensors 12 from the plurality of temperature sensors 12. Next, in step S6, state information Ds indicating the amount of cold storage of the cold storage body 10 is generated based on the temperatures detected by the plurality of temperature sensors 12.

For example, the controller 30 selects a plurality of temperatures that are equal to or higher than the first threshold value indicating that the cold storage body 10 is in a molten state from the information Db, and spatially detects the selected plurality of temperatures. The temperature gradient is determined in consideration of various positional relationships. When the outside air temperature of the cold storage device 100 is high, the temperature detected by the first temperature sensor 12a among the plurality of temperature sensors 12 is relatively high, and the temperature sensor 12 is farther from the first side surface 62 than the first temperature sensor 12a. A low temperature distribution is produced. The absolute value of the temperature gradient increases as the amount of heat input from the external space of the cold storage device 100 through the first side surface 62 to the cold storage chamber 15 increases. The cold heat of the cold storage body 10 corresponding to this amount of heat input is consumed. Therefore, the controller 30 can determine the amount of cold heat consumed Cc based on, for example, the temperature gradient. Further, the controller 30 obtains the cold storage amount of the cold storage body 10 during the period when the blower 20 is stopped by subtracting the cold heat consumption amount Cc determined based on the temperature gradient from the initial cold storage amount Ci, for example, and obtains the state information. Generate Ds.

Instead of obtaining the cold storage amount of the cold storage body 10 by subtracting the cold heat consumption amount Cc from the initial cold storage amount Ci, the controller 30 is a cold storage body based on the temperatures detected by the plurality of temperature sensors 12 and the plurality of temperature sensors 13. The cold storage amount of 10 may be directly obtained. In this case, instead of step S6, the controller 30 is a step of generating the state information Ds after obtaining the cold storage amount of the cold storage body 10 based on the temperatures detected by the plurality of temperature sensors 12 and the plurality of temperature sensors 13. Is executed by.

For example, as shown in FIG. 4, the first box body 11a, the second box body 11b, and the third box body 11c have a first temperature sensor 12a, a second temperature sensor 12b, and a third temperature sensor 12c, respectively. Have been placed. The third box body 11c is a box body adjacent to the second box body 11b in the first direction. For example, consider the case where a temperature gradient as shown in FIG. 7 is obtained based on the temperatures detected by the first temperature sensor 12a, the second temperature sensor 12b, and the third temperature sensor 12c. The alternate long and short dash line in FIG. 7 indicates a specific temperature range defined by the first threshold value (upper limit value) and the second threshold value (lower limit value), and the cold storage material 10a changes from solid to liquid in this temperature range. Each plot in FIG. 7 shows the temperature detected by the first temperature sensor 12a, the second temperature sensor 12b, or the third temperature sensor 12c. As shown in FIG. 7, the temperature detected by the temperature sensor 12 decreases as the distance from the first side surface 62 increases. For example, from such a temperature gradient, the controller 30 calculates the amount of heat input from the external space of the cold storage device 100 to the cold storage chamber 15 through the first side surface 62. In addition, the controller 30 reduces the cold storage amount of the cold storage body 10 by subtracting the integrated value (cold heat consumption amount) of the heat input amount immediately after the blower 20 is stopped or immediately after the refrigeration cycle 70 is stopped from the initial cold storage amount Ci. Obtain and generate state information Ds.

Next, in step S7, the controller 30 causes the display device 40 to display the state information. Next, in step S8, the controller 30 determines whether or not the blower 20 is operating. If the determination result in step S8 is affirmative, the series of processes is terminated. If the determination result in step S8 is negative, the process proceeds to step S9, and the controller 30 determines whether or not a predetermined time (for example, one minute or several minutes) has elapsed. If the determination result in step S9 is negative, the process returns to step S8. If the determination result in step S9 is affirmative, the process returns to step S4 and the processes of steps S4 to S7 are executed again. In this case, for example, as described above, the controller 30 may generate the state information Ds using the temperature gradient, or uses the temporal change of the temperature detected by the temperature sensor 12 instead of the temperature gradient. And the state information Ds may be generated.

For example, consider the case where the temperature detected by the first temperature sensor 12a, the second temperature sensor 12b, and the third temperature sensor 12c results in a temporal change in temperature as shown in FIG. The alternate long and short dash line in FIG. 8 indicates a specific temperature range defined by the first threshold value (upper limit value) and the second threshold value (lower limit value), as in FIG. 7. Further, the plots marked with circles in FIG. 8 show the first temperature sensor 12a, the second temperature sensor 12b, and the third temperature sensor 12c in the process of the Nth step S4 and S5 after the series of operations shown in FIG. 6 is started. Indicates the temperature detected by. N is a natural number. On the other hand, in the plot of the square mark in FIG. 8, the series of operations shown in FIG. 6 is started, and the first temperature sensor 12a, the second temperature sensor 12b, and the third temperature sensor 12c are processed in the N + 1th steps S4 and S5. Indicates the temperature detected by. Further, the broken line in FIG. 8 indicates, for example, a detection upper limit value which is a temperature 15 ° C. higher than the first threshold value.

As shown in FIG. 8, the temperature detected by the first temperature sensor 12a in the Nth processing of steps S4 and S5 is equal to or higher than the detection upper limit value. In this case, the temperature detected by the first temperature sensor 12a has risen to a temperature close to the temperature of the external space of the cold storage device 100. Therefore, the temperature detected by the first temperature sensor 12a in the N + 1th processing of steps S4 and S5 is almost higher than the temperature detected by the first temperature sensor 12a in the Nth processing of steps S4 and S5. Absent. Therefore, it is difficult to obtain the amount of heat input from the external space of the cold storage device 100 through the first side surface 62 to the cold storage chamber 15 by using the temporal change of the temperature detected by the first temperature sensor 12a. Further, the temperature detected by the third temperature sensor 12c in the Nth processing of steps S4 and S5 is less than the first threshold value, and cold heat is consumed by the phase change of the cold storage body 10 housed in the third box body 11c. To. Therefore, it is difficult to obtain the amount of heat input from the external space of the cold storage device 100 through the first side surface 62 to the cold storage chamber 15 by using the temporal change of the temperature detected by the third temperature sensor 12c.

On the other hand, the temperature detected by the second temperature sensor 12b in the Nth processing of steps S4 and S5 and the N + 1th processing of steps S4 and S5 is within the temperature range between the first threshold value and the detection upper limit value. It fits. As a result, the temperature detected by the second temperature sensor 12b in the N + 1th processing of steps S4 and S5 greatly increases from the temperature detected by the second temperature sensor 12b in the Nth processing of steps S4 and S5. There is. The temporal change in temperature detected by the second temperature sensor 12b indicates a temperature rise due to a sensible heat change accompanying heat input transmitted from the external space of the cold storage device 100 through the first side surface 62 to the cold storage chamber 15. Therefore, the controller 30 consumes cold heat as a product of, for example, the amount of change in temperature detected by the second temperature sensor 12b and the heat capacity of the cold storage body 10 housed in the second box body 11b and the second box body 11b. The amount can be calculated. Further, the controller 30 can obtain the current cold storage amount of the cold storage body 10 by subtracting the cold heat consumption amount from the cold storage amount of the cold storage body 10 obtained in the Nth step S6, and can generate the state information Ds.

In step S7, the controller 30 may generate information directly indicating the cold storage amount of the cold storage body 10 as the state information Ds, or generate information indirectly indicating the cold storage amount of the cold storage body 10. May be good. The information that indirectly indicates the amount of cold storage of the cold storage body 10 is, for example, the cold storage time and the time required for a predetermined amount of the cold storage body 10 of the cold storage bodies 10 included in the cold storage device 100 to solidify.

The cold insulation time means, for example, a time during which the air passing through the cold storage chamber 15 can be cooled to a predetermined temperature or less by the cold storage body 10 when the blower 20 is operated. The cold storage time can be obtained, for example, based on the amount of cold heat and the amount of cold storage per unit time discharged from the inside of the cold storage device 100 to the outside of the cold storage device 100. The amount of cold heat per unit time discharged from the inside of the cold storage device 100 to the outside of the cold storage device 100 is determined based on, for example, the difference between the temperature outside the cold storage device 100 and the temperature in the internal space of the cold storage device 100. .. The cold storage device 100 further includes a storage room temperature sensor (not shown) for detecting the temperature of the storage room 50, and the storage room temperature sensor is connected to the controller 30 so as to be able to communicate by wire or wirelessly. ing. The controller 30 further acquires information indicating the temperature detected by the storage room temperature sensor. In this case, the controller 30 determines the amount of heat input to the cold storage chamber 15 from the temperature gradient obtained from the temperature detected by the temperature sensor 12, and then estimates the outside air temperature of the cold storage device 100 from the amount of heat input. The controller 30 per unit time is discharged from the inside of the cold storage device 100 to the outside of the cold storage device 100 based on the estimated outside air temperature of the cold storage device 100 and the information indicating the temperature detected by the storage room temperature sensor. Determine the amount of cold heat. Further, in the controller 30, for example, when the cold storage amount is A [J] and the cold heat amount per unit time discharged from the inside of the cold storage device 100 to the outside of the cold storage device 100 is B [W], A Determine the cold storage time as / B [seconds].

In the controller 30, for example, when the refrigeration cycle 70 is operated in the cold storage body 10 in which the cold storage material 10a is in a liquid state to store cold heat, a predetermined amount of the cold storage body 10 among the cold storage bodies 10 included in the cold storage device 100 is solidified. The time required for this is generated as the state information Ds. The predetermined amount of the cold storage body 10 may be all of the cold storage bodies 10 included in the cold storage device 100, or may be a part of the cold storage bodies 10 included in the cold storage device 100. For example, the controller 30 determines the time required for the entire cold storage body 10 to solidify based on the cooling capacity of the evaporator 71 and the cold storage amount of the cold storage body 10. The cooling capacity of the evaporator 71 is stored in the controller 30, for example. The time required for the entire cold storage body 10 to solidify is, for example, the amount of cold storage is C [J], and the amount of cold heat stored in the cold storage body 10 when the entire cold storage body 10 is solidified is D [J]. If there is, and the cooling capacity of the evaporator 71 is E [W], it is calculated as (DC) / E [seconds].

The cold storage device of the present disclosure can grasp the cold storage amount of the cold storage body, and can be used for the purpose of temporarily storing cold heat in refrigeration or freezing.

10 Cold storage body 11 Box body 11a First box body 11b Second box body 11mm Next box body 12 Temperature sensor 12a First temperature sensor 15 Cold storage room 20 Blower 30 Controller 40 Display device 61 Bottom surface 62 First side surface 65 Wall 100 Cold storage apparatus

Claims (11)

A wall having an inner peripheral surface including a bottom surface and a first side surface extending upward from the peripheral edge of the bottom surface, and defining a cold storage chamber by the inner peripheral surface.
Each of the cold storage bodies is housed, and is a plurality of boxes arranged at predetermined intervals along the first direction in the cold storage chamber, and among the plurality of boxes, the most on the first side surface. Multiple boxes, including the first box, which is a close box,
A blower that creates a flow of air that passes through a space defined between adjacent boxes of the plurality of boxes.
The first temperature sensor arranged in the first box body is included, and the first temperature sensor is arranged in different boxes along a straight line, and the surface temperature of the box body, the surface temperature of the cold storage body, or the above. A group of first temperature sensors consisting of multiple temperature sensors that detect the temperature inside the cold storage body,
In at least one of the plurality of boxes, the air is arranged along the flow direction of the air, and the surface temperature of the box, the surface temperature of the cold storage body, or the temperature inside the cold storage body is detected. A second temperature sensor group consisting of multiple temperature sensors
The amount of cold storage of the cold storage body is determined based on the temperature detected by at least one temperature sensor included in the first temperature sensor group and the temperature detected by the plurality of temperature sensors included in the second temperature sensor group. A controller that generates the indicated status information and outputs the status information,
A display device for displaying the state information output by the controller, and the like.
Cold storage device. When the total length of each of the plurality of boxes in the longitudinal direction is expressed as LT,
Each of the plurality of temperature sensors included in the first temperature sensor group is arranged in a region of less than LT / 2 from the most upstream end in the air flow direction toward the downstream side in the air flow direction. , The cold storage device according to claim 1. The plurality of temperature sensors included in the first temperature sensor group are at least the first box and a second box adjacent to the first box among the plurality of boxes. The cold storage device according to claim 1 or 2, which is arranged in. The number of the plurality of boxes is three,
Among the plurality of boxes, the temperature sensors included in the first temperature sensor group are arranged only in the first box and the second box which is a box adjacent to the first box. The cold storage device according to claim 1 or 2. The number of the plurality of boxes is 2n or 2n + 1 when n is defined as a natural number of 2 or more.
The plurality of temperature sensors included in the first temperature sensor group are between the m-th order box body, which is the box body n + 1th closest to the first side surface among the plurality of boxes, and the first box body. The cold storage device according to any one of claims 1 to 3, which is arranged only in at least one box body selected from the box bodies arranged in the box and the first box body. The plurality of temperature sensors included in the first temperature sensor group are arranged only in n or less consecutively arranged boxes including the first box among the plurality of boxes. , The cold storage device according to claim 5. The cold storage device according to any one of claims 1 to 6, wherein the straight line is a straight line perpendicular to the direction parallel to the longest side and the height direction in the first box body. The first direction is a direction perpendicular to the first side surface.
The longest side of each of the plurality of boxes extends in a direction parallel to the first side surface.
The cold storage device according to any one of claims 1 to 7, wherein the straight line is a straight line perpendicular to the first side surface. The blower creates the air flow in a second direction parallel to the bottom surface and the first side surface.
Claims 1 to 8, wherein each of the plurality of temperature sensors included in the first temperature sensor group is arranged at an upstream end portion of each of the plurality of boxes in the direction of the air flow. The cold storage device according to any one item. When the total length of each of the plurality of boxes in the longitudinal direction is expressed as LT,
Each of the plurality of temperature sensors included in the first temperature sensor group is arranged in a region of LT / 3 or less from the most upstream end in the air flow direction toward the downstream side in the air flow direction. , The cold storage device according to any one of claims 1 to 9. The cold storage device according to claim 1, wherein the controller generates the state information based on the temperature detected by the plurality of temperature sensors included in the first temperature sensor group and outputs the state information.

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