JP6960583B2 - Cold storage device - Google Patents

Description

The present disclosure relates to a cold storage device.

Cold roll boxes equipped with a cold storage device are 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.

In Patent Document 1, as shown in FIG. 8, a box in which a cold storage body 10 is housed and a temperature sensor 18 is arranged in the center on the left side of the cold storage body 10 in order to detect the surface temperature of the cold storage body 10. A cold storage device including the body 11 is disclosed. When the cold storage device is kept cold, air circulates on both side surfaces of the box body 11 and exchanges heat with the cold storage body 10 to maintain the inside of the cold storage device at a constant temperature.

A plurality of temperature sensors 18 are installed in the air flow direction of the box body 11, and the cold storage amount of the cold storage body 10 is calculated based on the detected plurality of temperatures, and status information such as the cold storage possible time or the cold storage completion time is displayed on the display unit. Display with.

International Publication No. 2017/061067

When the cold storage device keeps cold, frost may adhere to the surface of the box. Since the cold storage time of the cold storage device is affected by this frost, it is necessary to correct the cold storage time according to the frosted state. However, in the prior art, since the amount of frost formation cannot be appropriately grasped, there is a problem that the cold insulation time according to the amount of frost formation cannot be appropriately calculated.

The present disclosure solves the above-mentioned conventional problems, and provides a cold storage device capable of appropriately grasping the amount of frost on the surface of a box and appropriately calculating the cold insulation time according to the amount of frost. With the goal.

The cold storage device of the present disclosure includes a cold storage chamber in which a box containing a cold storage body is arranged, a storage chamber that is separably partitioned from the cold storage chamber and is kept cold by the cold heat of the cold storage body, and the cold storage chamber or the cold storage chamber or the cold storage chamber. An air temperature sensor arranged in the storage chamber to detect the temperature of air and an air temperature sensor arranged in the cold storage chamber or the storage chamber to flow air along the box body and store the air cooled by the cold storage body. A blower that circulates in the chamber, a cold storage body temperature sensor that is arranged in contact with at least one cold storage body and detects the surface temperature of the cold storage body, and a constant distance between the cold storage body temperature sensor and the box body. It is a cold storage device that has a structure to keep it.

The cold storage device of the present disclosure can appropriately calculate the cold insulation time of the cold storage device according to the frosted state on the surface of the box.

Sectional drawing of the cold storage apparatus which concerns on Embodiment 1. Perspective view of the cold storage chamber according to the first embodiment A block diagram schematically showing a part of the cold storage device according to the first embodiment. Cross-sectional view of the box body along the line AA of FIG. Block diagram of the control device according to the first embodiment Flow chart showing the operation of the cold storage device A graph showing an example of the detection result of the cold storage body temperature sensor installed in the box body on the upstream side of the air when the frosted state of the cold storage device according to the first embodiment changes. A graph showing an example of the detection result of the cold storage body temperature sensor installed in the box body on the downstream side of the air when the frosted state of the cold storage device according to the first embodiment changes. Cross-sectional view of the box body according to the second embodiment Cross-sectional view of the box body according to the prior art

(Knowledge based on the study by the present inventors)
It is known that when frost adheres to the surface of the box body of the cold storage device, the frost acts as a thermal resistance and hinders the transfer of cold heat from the cold storage device to the air, shortening the cold storage time of the cold storage device. Therefore, the present inventors considered that it is necessary to grasp the frosted state and correct the cold insulation time according to the state. The temperature difference between the surface temperature of the cold storage body and the air temperature of the cold storage chamber or the storage chamber correlates with the thermal resistance between the cold storage body and the air, that is, the amount of frost formation, and the frost formation state is grasped from this temperature difference. be able to. As a result, the cold storage time can be obtained. However, in the conventional cold storage device, the present inventors have paid attention to the fact that the distance between the cold storage body and the box body changes as the cold storage body repeats solidification and melting. When the distance between the cold storage body and the box body changes, the thermal resistance between the cold storage body and the box body also changes. Therefore, conventionally, when frost adheres to the surface of the box while the thermal resistance between the cold storage body and the box body has changed, it is not possible to properly grasp the increase in the thermal resistance due to frost, and thus the frosted state. However, it becomes difficult to grasp it properly. Therefore, the present inventors have discovered that there is a problem that the cold insulation time of the cold storage device cannot be appropriately calculated according to the amount of frost formation.

In this regard, the present inventors have focused on the fact that the thermal resistance from the cold storage body to the air, that is, the amount of frost formation, is obtained by using the temperature difference between the surface temperature of the cold storage body and the air temperature. That is, if the positional relationship between the temperature sensor that measures the surface of the cold storage body, the box body, and the temperature sensor that measures the air temperature is fixed, the cold storage body inside the box solidifies and solidifies while the air temperature is maintained at a constant temperature. Even if the melting is repeated, the amount of frost formation, that is, the thickness of the frost adhering to the surface of the box body can be appropriately grasped from the temperature difference between the surface temperature of the cold storage body and the air temperature. Here, since the temperature sensor for measuring the air temperature is installed outside the box body, the position with respect to the box body is fixed regardless of the state of the cold storage body inside the box body. Therefore, if the position of the temperature sensor installed inside the box body for measuring the surface of the cold storage body is always fixed with respect to the box body, the thermal resistance between the cold storage body and the box body is always constant. can do. As a result, the change in thermal resistance from the cold storage body to the air is substantially a change according to the amount of frost formation. Therefore, if the surface temperature of the cold storage body and the air temperature can be appropriately grasped, the amount of frost formation can be appropriately obtained, and therefore the cold storage time of the cold storage device can be appropriately calculated.

Here, the thermal resistance indicates the difficulty of heat transfer between a certain two points. For example, in the present specification, when two objects are in contact with each other, the thermal resistance between both ends is a value obtained by dividing the thermal conductivity of each object by the respective thickness (unit: W / m ² K). ^{The thermal resistance (m 2} K / W) is the inverse of the sum (= heat transfer coefficient) of the heat transfer coefficient (W / m ^{2 K) between the two objects.}

Based on the above, the present inventors always position the temperature sensor for measuring the surface of the cold storage body constant with respect to the box body so that the cold storage time can be appropriately calculated according to the frosted state. We examined such a configuration.

The first aspect of the present disclosure is
A cold storage room with a box containing the cold storage body, and
A storage chamber that is partitioned so as to communicate with the cold storage chamber and is kept cold by the cold heat of the cold storage body.
An air temperature sensor arranged in the cold storage chamber or the storage chamber to detect the temperature of air, and
A blower arranged in the cold storage chamber or the storage chamber, allowing air to flow along the box body and circulating air cooled by the cold storage chamber to the storage chamber.
A cold storage body temperature sensor that is arranged in contact with at least one cold storage body and detects the surface temperature of the cold storage body, and a cold storage body temperature sensor.
A structure that keeps the distance between the cold storage body temperature sensor and the box body constant,
It is a cold storage device having.

According to the first aspect, since the thermal resistance between the cold storage body and the box body can always be constant, the temperature difference between the surface temperature of the cold storage body and the air temperature of the cold storage chamber or the storage chamber is measured. By doing so, the thermal resistance that changes in the frosted state can be known. Therefore, even if the cold storage body in the box repeatedly expands and contracts due to solidification and melting, the amount of frost adhering to the box body surface can be grasped by the thermal resistance obtained from the temperature difference between the cold storage body surface temperature and the air temperature. Therefore, it is possible to appropriately grasp the cold insulation time of the cold storage device according to the amount of frost formation.

A second aspect of the present disclosure is in addition to the first aspect.
The structure is
A spacer that is sandwiched between the cold storage body temperature sensor and the box body and is in contact with both the cold storage body temperature sensor and the box body.
It is a cold storage device.

According to the second aspect, the distance between the cold storage body temperature sensor and the box body can be surely kept constant.

A third aspect of the present disclosure is in addition to the first aspect.
The structure is
It is a convex portion in which a part of the wall surface of the box body is projected toward the cold storage body and brought into contact with the cold storage body temperature sensor.
It is a cold storage device.

According to the third aspect, the distance between the cold storage body temperature sensor and the box body can be surely kept constant without increasing the number of parts.

A fourth aspect of the present disclosure is in addition to the first aspect.
The structure is
A convex portion in which a part of the wall surface of the box body is projected toward the cold storage body, and
A spacer that is sandwiched between the convex portion and the cold storage body temperature sensor and is in contact with both the convex portion and the cold storage body temperature sensor.
Have,
It is a cold storage device.

According to the fourth aspect, even when the filling rate of the cold storage body is low, the distance between the cold storage body temperature sensor and the box body can be surely kept constant.

A fifth aspect of the present disclosure is in addition to any one of the first to fourth aspects.
Moreover,
An information generator that calculates the cold storage time by the cold storage body using the air temperature detected by the air temperature sensor and the surface temperature of the cold storage body detected by the cold storage body temperature sensor.
A display device that displays the cold storage time and
It is a cold storage device having.

According to the fifth aspect, the cold insulation time by the cold storage body can be appropriately calculated and displayed.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The present invention is not limited to this embodiment. Further, in the drawings, the X-axis direction, the Y-axis direction, and the Z-axis direction indicate the same direction. Also, the components described without reference to the X-axis, Y-axis, and Z-axis can be placed in appropriate positions as needed.

(Embodiment 1)
FIG. 1 shows a cross-sectional view of the cold storage device 100 according to the first embodiment. The X-axis indicates the direction from the door 70 of the cold storage device 100 toward the inside of the storage chamber 50, the Y-axis indicates the direction perpendicular to the X-axis in the horizontal plane, and the Z-axis indicates the direction vertically upward.

As shown in FIG. 1, the cold storage device 100 has a storage chamber 50 and a cold storage chamber 15, and the space between them is partitioned by a floor plate 60. A box body 11 containing the cold storage body 10 is arranged in the cold storage chamber 15, and a refrigeration cycle device 25 for cooling the cold storage body 10 is installed above the cold storage device 100. When the refrigeration cycle device 25 operates, an evaporator arranged so as to be in contact with the box body 11 creates a low temperature environment and cools the cold storage body 10.

The storage chamber 50 is configured by a door 70 on one side of the wall constituting the storage chamber 50 so that it can be accessed from the outside of the cold storage device 100. By opening the door 70, the luggage can be carried into the storage chamber 50 and stored. After storing the luggage, the door 70 is closed, and the luggage is transported to the destination in a state where the luggage is kept cold together with the cold storage device 100. When the door 70 is closed, the air in the cold storage device 100 is circulated by the blower 20 installed in the upper part of the storage chamber 50, and the cold storage body 10 and the air stored in the refrigeration cycle device 25 exchange heat with each other. By returning to the storage chamber 50 through the cold air duct 21, the temperature inside the storage chamber 50 is maintained at a constant temperature. As shown in FIG. 1, an air temperature sensor 13 is installed at a position below the blower 20 and detects it as the air temperature in the storage chamber 50. The detected temperature information is transmitted to the control device 30 described later. The constant temperature is, for example, -16 ° C. or lower in the freezing temperature range, and is, for example, 3 ° C. to 7 ° C. in the refrigerating temperature range, and the blower 20 is maintained in these temperature ranges. It is controlled by the operation of. The air temperature sensor 13 is installed at a position below the blower 20 in the storage chamber 50 here, but if it is a position where the air temperature in the cold storage device 100 can be measured, another position in the storage chamber 50, Alternatively, it may be installed at any position in the cold storage chamber 15.

As shown in FIG. 2, the box bodies 11 are arranged in a specific direction (Y-axis direction) in the cold storage chamber 15. For example, the box bodies 11 are arranged at predetermined intervals in the Y-axis direction. A cold storage body 10 is stored in each of the box bodies 11. The arrow in FIG. 1 or 2 indicates the direction of air flow generated by the action of the blower 20. As shown in FIG. 1 or 2, the blower 20 is a box along a direction (X-axis positive direction) that intersects a specific direction (Y-axis direction) in the plane (XY plane) in which the box bodies 11 are arranged. It creates a flow of air through the space formed between the bodies 11. As a result, the blower 20 circulates the air cooled by the cold storage body 10.

FIG. 3 schematically shows one of the box bodies 11. The cold storage body temperature sensor 12 detects the surface temperature of the cold storage body 10 stored inside the box body 11. The detected temperature information is transmitted to the control device 30 described later. A spacer 14 is arranged between the box body 11 and the cold storage body temperature sensor 12. FIG. 3 shows an example of detecting only one surface temperature of the cold storage body 10 on the upstream side in the air flow direction stored in the box body 11. The cold storage body temperature sensor 12 may be installed on the downstream side in the air flow direction together with the spacer 14, or a plurality of cold storage body temperature sensors 12 may be used together with the spacer 14 to detect the temperature at a plurality of locations. ..

FIG. 4 shows a cross-sectional view of the box body 11 along the line AA of FIG.

As shown in FIG. 4, the cold storage body 10 is formed, for example, by sealing the cold storage material 10a in 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. In this case, in order to cool the storage chamber 50 to the freezing temperature zone, the melting point of the cold storage material 10a needs to be at least −20 ° C. or lower. 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 cold storage body 10 is housed in a metal box body 11 such as aluminum. An evaporator 26 is arranged on the side surface of the box body 11. This is arranged so that the refrigerant pipe is in close contact with the box body 11 as a part of the refrigeration cycle device 25. When the cold storage device 100 stores cold, the refrigerant temperature of the evaporator 26 is controlled to be lower than the freezing point of the cold storage body 10, and the cold storage body 10 is stored cold. A cold storage body temperature sensor 12 is installed on the surface of the central portion on the left side of the cold storage body 10, and a spacer 14 is arranged so as to be sandwiched between the cold storage body temperature sensor 12 and the box body 11. The box body 11, the spacer 14, the cold storage body temperature sensor 12, and the cold storage body 10 are configured to always be in close contact with each other in this order in the Y-axis direction. With this spacer 14, even if the cold storage body 10 contracts due to solidification and swells due to melting, the positional relationship between the cold storage body temperature sensor 12 and the box body 11 can be maintained. Further, by adopting a material having high heat insulating properties such as urethane foam as the material of the spacer 14, the temperature of the cold storage body 10 can be measured while suppressing the influence of the air flowing on the surface of the box body 11. The close contact portions of the box body 11, the spacer 14, the cold storage body temperature sensor 12, and the cold storage body 10 may be brought into close contact with each other by using, for example, an adhesive, or the close contact state can be maintained without using an adhesive. If so, that's fine. The thickness of the spacer 14 may be set from the filling rate, which is the volume of the cold storage body 10 with respect to the volume of the box body 11, and the expansion rate of the cold storage body 10. Further, the cold storage body temperature sensor 12 may be installed on the right side, upper part or lower part of the cold storage body 10 together with the spacer 14.

When the cold storage device 100 is operated as a cold storage for luggage, the cold storage body 10 is almost always maintained below the freezing point for a long period of time. When the door 70 is opened by loading and unloading luggage during that period, water vapor invades the cold storage device 100 from the outside, and the water vapor is cooled on the surface of the box 11 by air circulation by the blower 20 and adheres as frost. go. Since the attached frost becomes an inhibitory factor for transferring the cold heat of the cold storage body 10 to the air circulating in the refrigerator, that is, thermal resistance, the cold insulation time decreases as the frost grows.

As a method of grasping the thermal resistance due to frost formation, when the air temperature sensor 13 shows a certain temperature, the thermal resistance can be calculated from the temperature difference between the cold storage body temperature sensor 12 and the air temperature sensor 13. In that case, it is important that the thermal resistance between the cold storage body temperature sensor 12 and the air temperature sensor 13 fluctuates only depending on the amount of frost on the surface of the box body 11, and this is realized by adopting the structure of the present embodiment. be able to. In the first embodiment, the air temperature sensor 13 is set to measure the temperature inside the storage chamber 50, but is installed so as to measure the temperature of the air flowing between the boxes 11 in the cold storage chamber 15. May be good.

FIG. 5A shows a block diagram of the control device 30 for calculating the cold insulation time using the temperature detected by the cold storage body temperature sensor 12 and the temperature detected by the air temperature sensor 13. The control device 30 may be incorporated in the cold storage device 100, or may be configured separately from the cold storage device 100 and connected to the cold storage device 100 by wire or wirelessly. The control device 30 includes an information generation unit 31, an information storage unit 35, and a display unit 40. Information indicating the temperature detected by the cold storage body temperature sensor 12 and the air temperature sensor 13 is input to the information generation unit 31. The information generation unit 31 determines the amount of frost adhering to the surface of the box 11 based on the temperature of the cold storage 10 detected by the cold storage temperature sensor 12 and the air temperature of the storage chamber 50 detected by the air temperature sensor 13. Ask. Further, the cold storage time of the cold storage device 100 is calculated from the obtained frost formation amount and the cold storage amount of the cold storage body 10 stored in the information storage unit 35. The information storage unit 35 stores at least one of the current information required for calculating the cold storage time, such as the frost formation amount, the cold storage amount, and the cold storage time. The display unit 40 displays the cold storage possible time that reflects the state of frost calculated by the information generation unit 31. The display unit 40 may be incorporated in the control device 30 as shown in FIG. 5A, or may be configured separately from the control device 30 and connected to the control device 30 by wire or wirelessly. You may be.

The cold storage body temperature sensor 12 and the air temperature sensor 13 are not particularly limited, and are, for example, a contact type temperature sensor having a thermocouple or a thermister or a non-contact type temperature sensor having a thermopile.

As described above, the cold storage body temperature sensor 12 and the air temperature sensor 13 are connected to the information generation unit 31 so as to be able to communicate by wire or wirelessly. Therefore, information indicating the temperature detected by the cold storage body temperature sensor 12 and the air temperature sensor 13 is input to the information generation unit 31. The information generation unit 31 is configured as a computer including, for example, an interface for input / output of information, an arithmetic unit such as a CPU, a main storage device such as a memory, and an auxiliary storage device such as a hard disk drive. The information generation unit 31 is connected to the information storage unit 35 and the display unit 40 by a communication cable, for example, as shown in FIG. 5A, and the information storage unit 35 stores the amount of frost formation obtained by the information generation unit 31. The amount of frost formation is passed to the information generation unit 31 when calculating the cold storage time at the next cold storage. In addition, state information such as the cold release time, which indicates the state of the cold storage device 100, is output to the display unit 40. The display unit 40 may be incorporated in the control device 30 as described above, or may be configured separately from the control device 30, and is not particularly limited, but is, for example, a liquid crystal display or an organic EL display. be. The display unit 40 is arranged, for example, on the outer peripheral surface of the housing of the cold storage device 100. The state information indicating the state of the cold storage body 10 may be wirelessly transmitted from the information generation unit 31 to the information terminal of the user of the cold storage device 100 or the base station that centrally manages the cold storage device 100. Further, the information generation unit 31 and the information storage unit 35 do not necessarily have to be installed in the cold storage device 100. The data necessary for calculating the state information of the cold storage body 10 may be wirelessly transmitted from the cold storage device 100 to the information generation unit 31 installed at another location to calculate the state information of the cold storage body 10.

An example of the operation of the cold storage device 100 configured as described above in the control device 30 until the cold insulation possible time is calculated and displayed will be described below.

This operation is started when the storage chamber 50 of the cold storage device 100 is kept cold at a certain temperature. As shown in FIG. 5B, when the storage chamber 50 is kept cold below a predetermined temperature, the cold storage device 100 starts an operation for grasping the frosted state of the box body 11.

First, the cold storage device 100 detects the temperature using the cold storage body temperature sensor 12 and the air temperature sensor 13, and in step S1, the control device 30 inputs the temperature information to the information generation unit 31.

Next, in step S2, the information generation unit 31 obtains the amount of frost on the surface of the box 11 based on the input cold storage body temperature and air temperature.

In step S3, the amount of frost formed by the information generation unit 31 is stored in the information storage unit 35.

After step S3, the cold storage device 100 stops the cold insulation to carry out the cold storage, and then starts the cold insulation again. At that time, the control device 30 performs the operations after step S4.

In step S4, the information generation unit 31 calculates the cold storage time of the cold storage device 100 by using the state information of the cold storage body 10 such as the cold storage amount of the cold storage body 10 and the frost formation amount stored in the information storage unit 35. ..

Finally, in step S5, the cold insulation time of the cold storage device 100 calculated by the information generation unit 31 is displayed on the display unit 40, and a series of operations is completed.

FIG. 6A shows an example of the temperature behavior of the cold storage body at a constant air temperature when the frosted state is changed by using the cold storage device 100 of the first embodiment. In this example, the air temperature of the storage chamber 50 indicates the temperature of the cold storage body 10 at two levels (-19 ° C. and -16 ° C.). Since the cold storage body temperature sensor 12 is installed on the upstream side with respect to the air flow of the box body 11, the temperature of the cold storage body 10 at each air temperature shows a value higher than the melting point of the cold storage body 10, and the amount of frost formation increases. Therefore, the temperature of the cold storage body 10 becomes low. This was possible even if the temperature difference between the temperature of the cold storage body 10 and the air temperature was small when there was little frost formation in order to maintain the same air temperature, but due to the increase in the amount of frost formation, that is, the increase in thermal resistance. This is because a temperature difference is required. Therefore, the amount of frost formation can be grasped from the temperature difference between the temperature of the cold storage body 10 measured by the cold storage body temperature sensor 12 and the air temperature at the specific air temperature measured by the air temperature sensor 13. Further, by calculating the cold storage possible time at the time of the next cold storage after grasping the amount of frost formation, it is possible to display the cold storage possible time at the time of frost formation.

FIG. 6B is a modified example of the first embodiment, although not shown, when the cold storage body temperature sensor 12 is installed on the downstream side of the air flow of the box body 11 to change the frost formation state. An example of the temperature behavior of 10 is shown. Since the cold storage body temperature sensor 12 is installed on the downstream side of the air flow of the box body 11, the temperature of the cold storage body 10 at each air temperature shows a value lower than the melting point of the cold storage body 10, and the amount of frost formation increases. Therefore, the temperature of the cold storage body 10 becomes low. However, as compared with FIG. 6A, the lower the air temperature, the larger the range of change in the temperature of the cold storage body 10 due to the change in the amount of frost formation. That is, when the temperature of the cold storage body 10 indicates a temperature close to the melting point of the cold storage body 10, the temperature change width becomes small because it enters the phase change region from the solid to the liquid. Therefore, in order to detect the amount of frost formation with high accuracy by the temperature detection by the cold storage body temperature sensor 12, the cold storage body 10 measures and detects the temperature away from the melting point of the cold storage body 10 with respect to the air temperature. It is desirable to do.

As described above, in the present embodiment, the storage chamber 50 is partitioned so as to be communicable with the cold storage chamber 15 and the box body 11 in which the cold storage body 10 is stored in the cold storage chamber 15, and is kept cold by the cold heat of the cold storage chamber 10. A blower 20 that allows air to flow through the space between the boxes 11 and circulates the air cooled by the cold storage body 10 to the storage chamber 50, and a cold storage body temperature sensor 12 that detects the surface temperature of at least one cold storage body 10. A cold storage device characterized in that the air temperature sensor 13 for measuring the air temperature of the cold storage chamber 15 or the storage chamber 50, and the cold storage body temperature sensor 12 and the cold storage body temperature sensor 12 keep the distance of the box body 11 constant. Therefore, the thermal resistance between the cold storage body 10 and the box body 11 can always be constant, so that the temperature difference between the surface temperature of the cold storage body 10 and the air temperature of the cold storage chamber 15 or the storage chamber 50 By measuring, the thermal resistance that changes depending on the frosted state can be known. Therefore, even if the cold storage body 10 in the box body 11 repeatedly expands and contracts due to solidification and melting, frost adhering to the surface of the box body 11 due to the thermal resistance obtained from the temperature difference between the cold storage body surface temperature and the air temperature. Since the amount can be grasped, it is possible to grasp the cold insulation time of the cold storage device 100 according to the amount of frost formation.

(Embodiment 2)
The cold storage device 100 according to the second embodiment will be described. The second embodiment is configured in the same manner as the first embodiment unless otherwise specified. The same components as those of the first embodiment or the corresponding components of the second embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. The description of the first embodiment also applies to the second embodiment as long as there is no technical contradiction.

As shown in FIG. 7, on the surface of the box body 11 on which the evaporator 26 is installed, a convex portion protruding toward the inside of the box body 11 at the central portion on the side opposite to the side where the evaporator 26 is installed. (A dent when viewed from the outside of the box body 11) is provided. With such a structure, it is possible to obtain the same effect of grasping the amount of frost adhering to the surface of the box body 11 as in the first embodiment without using the spacer 14 used in the first embodiment. The number of parts of the cold storage device 100 can be reduced.

Further, when the filling rate of the cold storage body stored in the box body 11 is low and there is no structure for keeping the distance between the box body 11 and the cold storage body temperature sensor 12 constant, the cold storage body expands and contracts due to solidification and melting. Repeatedly, there is a possibility that the fluctuation of the distance between the box body 11 and the cold storage body temperature sensor 12 becomes large. In such a case, the spacer 14 used in the first embodiment may be arranged on the dent of the box body 11 shown in the second embodiment. By doing so, the distance between the box body 11 and the cold storage body temperature sensor 12 can be more reliably and constantly maintained.

As described above, since the cold storage device according to the present disclosure can grasp the frosted state on the surface of the box body, it can be applied to the use of temporarily storing cold heat in refrigeration or freezing.

10 Cold storage body 10a Cold storage material 10b Container 11 Box body 12 Cold storage body temperature sensor 13 Air temperature sensor 14 Spacer 15 Cold storage room 18 Temperature sensor 20 Blower 21 Cold air duct 25 Refrigeration cycle device 26 Evaporator 30 Control device 31 Information generator 35 Information storage Part 40 Display part 50 Storage room 60 Floor board 70 Door 100 Cold storage device

Claims (5)

A cold storage room with a box containing the cold storage body, and
A storage chamber that is partitioned so as to communicate with the cold storage chamber and is kept cold by the cold heat of the cold storage body.
An air temperature sensor arranged in the cold storage chamber or the storage chamber to detect the temperature of air, and
A blower arranged in the cold storage chamber or the storage chamber, allowing air to flow along the box body and circulating air cooled by the cold storage chamber to the storage chamber.
A cold storage body temperature sensor that is arranged in contact with at least one cold storage body and detects the surface temperature of the cold storage body, and a cold storage body temperature sensor.
A structure that keeps the distance between the cold storage body temperature sensor and the box body constant,
Cold storage device with. The structure is
A spacer that is sandwiched between the cold storage body temperature sensor and the box body and is in contact with both the cold storage body temperature sensor and the box body.
The cold storage device according to claim 1. The structure is
It is a convex portion in which a part of the wall surface of the box body is projected toward the cold storage body and brought into contact with the cold storage body temperature sensor.
The cold storage device according to claim 1. The structure is
A convex portion in which a part of the wall surface of the box body is projected toward the cold storage body, and
A spacer that is sandwiched between the convex portion and the cold storage body temperature sensor and is in contact with both the convex portion and the cold storage body temperature sensor.
Have,
The cold storage device according to claim 1. Moreover,
An information generator that calculates the cold storage time by the cold storage body using the air temperature detected by the air temperature sensor and the surface temperature of the cold storage body detected by the cold storage body temperature sensor.
A display device that displays the cold storage time and
Have,
The cold storage device according to any one of claims 1 to 4.

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