JP2019086175A - Cold storage device - Google Patents

Abstract

To provide a cold storage device enabling storage available time according to an amount of frost formation on a box body surface to be appropriately calculated.SOLUTION: A cold storage device has such a structure that a cold storage body 10 is housed in a box body 11, and a distance between a cold storage body temperature sensor 12 detecting a surface temperature of the cold storage body 10 and the box body 11 is kept constant. Cold storage available time is calculated using the detected surface temperature of the cold storage body 10 and a temperature of air outside the box body 11. A correction condition when calculating the cold storage available time is determined simply by considering only an amount of frost formation on the outer surface of the box body 11 since the distance between the cold storage body temperature sensor 12 and the box body 11 is constant and accordingly a condition inside the box body 11 is constant, so that the cold storage available time can be appropriately calculated.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to a cold storage device.

  A cold roll box equipped with a cold storage device is known. The cold roll box is, for example, loaded on a carrier of a delivery vehicle and transported while an article such as food is 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 accommodated and a temperature sensor 18 is disposed at the left central portion of the cold storage body 10 to detect the surface temperature of the cold storage body 10 A regenerator with a body 11 is disclosed. At the time of cold storage of the cold storage device, air flows through both side surfaces of the box body 11 and exchanges heat with the cold storage body 10, whereby the inside of the cold storage device is maintained at a constant temperature.

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

International Publication No. 2017/061067

  When the cold storage apparatus cools, frost may adhere to the surface of the box. Since the cold storage available time of the cold storage device is affected by the frost, it is necessary to correct the cold stored available time according to the frost formation state. However, in the prior art, since the frost formation amount can not be grasped appropriately, there is a problem that the cold storageable time according to the frost formation amount can not be calculated appropriately.

  The present disclosure is to solve the above-described conventional problems, and to provide a cool storage device capable of appropriately grasping the amount of frost formation on the surface of a box and appropriately calculating the coolable time according to the amount of frost formation. With the goal.

  The cold storage device according to the present disclosure includes a cold storage chamber in which a box body containing a cold storage body is disposed, a storage chamber partitioned so as to be in communication with the cold storage chamber, and cold storage by cold heat of the cold storage body, the cold storage chamber or An air temperature sensor disposed in the storage chamber for detecting the temperature of the air, and disposed in the cold storage chamber or the storage chamber, flowing air along the box, and storing the air cooled by the cold storage body The distance between the regenerative body temperature sensor, which is disposed in contact with at least one of the regenerative body, and which detects the surface temperature of the regenerative body, the regenerative body temperature sensor and the box is made constant It is set as the cool storage apparatus which has the structure to maintain.

  The cool storage device of the present disclosure can appropriately calculate the coolable time of the cool storage device according to the frosted state on the surface of the box body.

Cross-sectional view of a cool storage device according to Embodiment 1 The perspective view of the cool storage room which concerns on Embodiment 1. The block diagram which shows typically a part of cool storage apparatus which concerns on Embodiment 1. Sectional view of box taken along line A-A of FIG. 3 Block diagram of control device according to the first embodiment Flow chart showing the operation of the cold storage device The graph which shows an example of a detection result of the cool storage body temperature sensor installed in the box of the air upstream side at the time of the frost formation state of the cool storage apparatus which concerns on Embodiment 1 changing. The graph which shows an example of a detection result of the cool storage body temperature sensor installed in the box of the air downstream side when the frost formation state of the cool storage apparatus which concerns on Embodiment 1 changes Sectional view of a box according to Embodiment 2 Sectional view of a box according to the prior art

(Findings based on the study of the present inventors)
It is known that when frost adheres to the surface of the box of the cold storage device, the frost acts as a thermal resistance to inhibit the transfer of cold heat from the cold storage to the air, and the cold storage time of the cold storage becomes short. For this reason, the present inventors considered that it is necessary to grasp a frost formation state and to correct the cold storage available 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 room or storage room has a correlation 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 coolable time can be obtained. However, the inventors focused on the fact that in the conventional cold storage device, the distance between the cold storage body and the box changes as the cold storage body repeats solidification and melting. If the distance between the regenerator and the box changes, the thermal resistance between the regenerator and the box also changes. Therefore, conventionally, when frost adheres to the surface of the box in a state where the thermal resistance between the regenerator and the box changes, the amount of increase in the thermal resistance due to the frost can not be appropriately grasped, so the frosted state It is also difficult to grasp properly. For this reason, the present inventors have found that there is a problem that it is not possible to properly calculate the coolable time of the cold storage device according to the amount of frost formation.

  In this regard, the present inventors focused on the fact that the thermal resistance from the regenerator to the air, that is, the amount of frost formation can be determined using the temperature difference between the regenerator surface temperature and the air temperature. That is, if the positional relationship between the temperature sensor for measuring the surface of the cold storage body, the box, and the temperature sensor for measuring the air temperature is fixed, the cold storage body in the box solidifies in a state where the air temperature is kept constant. Even if the melting is repeated, the amount of frost formation, that is, the thickness of the frost adhering to the box surface can be properly grasped by the temperature difference between the cold storage body surface temperature and the air temperature. Here, since the temperature sensor which measures air temperature is installed in the exterior of a box, the position with respect to a box is fixed irrespective of the state of the cool storage inside a box. Therefore, if the position of the temperature sensor for measuring the surface of the cold storage body installed inside the box is always fixed with respect to the box, the thermal resistance between the cold storage and the box will always be constant. can do. As a result, the change in the thermal resistance from the regenerator to the air substantially corresponds to the amount of frost formed. Therefore, if the cold storage body surface temperature and the air temperature can be properly grasped, the frost formation amount can be appropriately determined, and therefore the cold storageable time of the cold storage device can be appropriately calculated.

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

  Based on the above, the present inventors can always calculate the coolable time according to the frosted state, so that the position of the temperature sensor for measuring the surface of the cold storage body is always fixed relative to the box. I examined the configuration like this.

The first aspect of the present disclosure is
The cool storage room which arranged the box where the cool storage is stored,
A storage chamber partitioned so as to be in communication with the cold storage chamber and cooled by cold heat of the cold storage body;
An air temperature sensor disposed in the cool storage room or the storage room to detect the temperature of air;
A blower disposed in the cool storage room or the storage room, flowing air along the box, and circulating air cooled by the cool storage body to the storage room;
A regenerator temperature sensor disposed in contact with at least one regenerator and detecting a surface temperature of the regenerator;
A structure for keeping the distance between the cool storage temperature sensor and the box constant;
It is a cold storage device having

  According to the first aspect, since the thermal resistance between the regenerator and the box can be made constant at all times, the temperature difference between the surface temperature of the regenerator and the air temperature of the regenerator or storage chamber is measured. By doing this, the thermal resistance changing in the frosted state can be known. Therefore, even if the cold storage in the box is repeatedly solidified and melted, swelling and contraction are repeated, the amount of frost deposited on the box surface is grasped by the thermal resistance obtained from the temperature difference between the cold surface and the air temperature. Therefore, it is possible to properly grasp the cold storage available 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 disposed between the regenerative body temperature sensor and the box and in contact with both the regenerative body temperature sensor and the box;
It is a cold storage device.

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

A third aspect of the present disclosure is in addition to the first aspect:
The structure is
It is a convex part which made a part of wall surface of the above-mentioned box object project toward the above-mentioned regenerative body, and was made to contact with the above-mentioned regenerative body temperature sensor,
It is a cold storage device.

  According to the third aspect, the distance between the cool storage temperature sensor and the box can be reliably 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
The convex part which made part of the wall surface of the said box body protrude toward the said cool storage body,
A spacer disposed between the convex portion and the regenerative body temperature sensor and in contact with both the convex portion and the regenerative body temperature sensor;
Have
It is a cold storage device.

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

In addition to any one of the first to fourth aspects, the fifth aspect of the present disclosure relates to:
further,
An information generator for calculating a time period in which the cold storage can be performed by using the air temperature detected by the air temperature sensor and the cold storage body surface temperature detected by the cold storage body temperature sensor;
A display device for displaying the coolable time;
It is a cold storage device having

  According to the fifth aspect, it is possible to appropriately calculate and display the coolable time by the cold storage body.

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

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

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

  One side of a wall constituting the storage room 50 is constituted by the door 70 so that the storage room 50 can be accessed from the outside of the cool storage device 100. By opening the door 70, the luggage can be carried into and stored in the storage room 50. When the luggage is stored, the door 70 is closed, and the whole cold storage apparatus 100 is transported to the destination in a state where the luggage is cooled. 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 are cooled by heat exchange by the refrigeration cycle device 25. By passing through the cold air duct 21 and returning to the storage room 50, the temperature in the storage room 50 is maintained at a constant temperature. As shown in FIG. 1, the air temperature sensor 13 is installed at a position below the blower 20 and is detected as the air temperature in the storage room 50. The detected temperature information is transmitted to the control device 30 described later. The constant temperature is, for example, -16 ° C. or less if it is a frozen temperature zone, or a temperature range of, for example, 3 ° C. to 7 ° C. if it is a refrigerated temperature zone. Controlled by the action of Here, the air temperature sensor 13 is installed at a position below the blower 20 in the storage room 50, but if it is a position at which the air temperature in the cold storage device 100 can be measured, another position in the storage room 50, Alternatively, it may be installed at any position in the cool storage chamber 15.

  As shown in FIG. 2, the box bodies 11 are arranged in a specific direction (Y-axis direction) in the cool storage chamber 15. For example, the box bodies 11 are disposed at predetermined intervals in the Y-axis direction. The cool storage body 10 is accommodated in each of the box body 11. Arrows in FIG. 1 or 2 indicate the flow direction of air generated by the action of the blower 20. As shown in FIG. 1 or FIG. 2, the blower 20 is a box along a direction (X-axis positive direction) intersecting with a specific direction (Y-axis direction) in the plane (in the XY plane) in which the box 11 is arranged. It generates a flow of air passing through the space formed between the bodies 11. Thereby, the blower 20 circulates the air cooled by the regenerator 10.

FIG. 3 schematically shows one of the boxes 11. The cool storage body temperature sensor 12 detects the surface temperature of the cool 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 disposed between the box body 11 and the cold storage body temperature sensor 12. In FIG. 3, the surface temperature of the cold storage body 10 stored on the upstream side of the air flow direction stored in the box 11 is shown as an example in which only one point is detected. The cold storage body temperature sensor 12 may be installed downstream with the spacer 14 in the air flow direction, or a plurality of cold storage body temperature sensors 12 may be used together with the spacer 14 to detect temperatures at a plurality of locations. .

  FIG. 4 shows a cross-sectional view of the box 11 taken along the line A-A of FIG.

  As shown in FIG. 4, for example, the cool storage material 10 is formed by sealing a cool storage material 10 a in a container 10 b made of a film. The cool storage body 10 can store cold heat in the form of latent heat, for example, by cooling and solidifying the liquid cool storage material 10a. The cold storage material 10a is not particularly limited, and 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 10 a needs to be at least −20 ° 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 disposed on both sides in the thickness direction of the aluminum layer. The regenerator 10 is accommodated in a metal box 11 such as aluminum. An evaporator 26 is disposed on the side of the box 11. As a part of the refrigeration cycle apparatus 25, the refrigerant pipe is disposed in close contact with the box body 11. During cold storage of the cold storage device 100, the refrigerant temperature of the evaporator 26 is controlled to a temperature lower than the freezing point of the cold storage body 10, and the cold storage body 10 is cold stored. A cold storage body temperature sensor 12 is installed on the surface of the left central portion of the cold storage body 10, and a spacer 14 is disposed so as to be sandwiched between the cold storage body temperature sensor 12 and the box 11. The box body 11, the spacer 14, the cold storage body temperature sensor 12, and the cold storage body 10 are configured to be in close contact with each other in this order in the Y-axis direction. By means of the spacer 14, even if the regenerative body 10 is contracted by solidification and swelled by melting, the positional relationship between the regenerative body temperature sensor 12 and the box 11 can be maintained. Further, by adopting, for example, a highly thermally insulating material such as urethane foam as the material of the spacer 14, it is possible to measure the temperature of the regenerative body 10 in which the influence of the air flowing on the surface of the box 11 is suppressed. For example, an adhesive may be used to adhere each box 11, the spacer 14, the cold storage body temperature sensor 12, and the cold storage 10 to the close contact portion, 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 based on the filling rate, which is the volume of the regenerative body 10 with respect to the volume of the box 11, and the expansion rate of the regenerative body 10. Furthermore, the installation position of the cold storage body temperature sensor 12 may be installed on the right side, the upper part, or the lower part of the cold storage body 10 together with the spacer 14.

  When the cold storage device 100 is operated as a storage cooler for luggage, the cold storage body 10 is maintained almost always at a temperature below freezing. During the period, when the door 70 is opened by loading and unloading of cargo, water vapor intrudes into 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 adhering frost becomes a hindrance factor that transfers the cold heat of the cold storage body 10 to the air circulating in the storage, that is, the thermal resistance, the time for which cold storage is possible decreases with the growth of the frost.

  As a method of grasping the thermal resistance due to frost formation, when the air temperature sensor 13 indicates a certain temperature, the thermal resistance can be calculated from the temperature difference between the regenerative 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 by the amount of frost formation on the surface of the box 11, and this is realized by adopting the structure of this embodiment. be able to. In the first embodiment, the air temperature sensor 13 is set to measure the temperature in the storage chamber 50. However, the air temperature sensor 13 is installed to measure the temperature of the air flowing between the box bodies 11 in the cool storage chamber 15. It is also good.

FIG. 5A shows a block diagram of the control device 30 for calculating the cold storage enable time using the temperature detected by the cold storage body temperature sensor 12 and the temperature detected by the air temperature sensor 13. Control device 30 may be incorporated in cold storage device 100 or may be configured separately from cold storage device 100 and connected to 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 deposited on the surface of the box 11 based on the temperature of the cold storage body 10 detected by the cold storage body temperature sensor 12 and the air temperature of the storage room 50 detected by the air temperature sensor 13. Ask. Further, the coolable time of the cold storage device 100 is calculated from the determined frost 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 information necessary for calculating the next coolable time, such as the current frost formation amount, cold storage amount, and coolable time. The display unit 40 displays the coolable time reflecting 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 is configured separately from the control device 30 and connected to the control device 30 by wire or wirelessly. It may be

  The regenerative body temperature sensor 12 and the air temperature sensor 13 are not particularly limited, but are, for example, a contact temperature sensor having a thermocouple or a thermistor or a non-contact 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 that communication can be performed by wire or wirelessly. Therefore, the information generation unit 31 receives information indicating the temperatures detected by the cold storage body temperature sensor 12 and the air temperature sensor 13 respectively. The information generation unit 31 is configured as a computer including, for example, an interface for input and output of information, an arithmetic device such as a CPU, a main storage device such as a memory, and an auxiliary storage device such as a hard disk drive. For example, as shown in FIG. 5A, the information generation unit 31 is connected to the information storage unit 35 and the display unit 40 by a communication cable, and stores in the information storage unit 35 the frost formation amount obtained by the information generation unit 31. The frost formation amount is delivered to the information generation unit 31 when calculating the cold storage enable time at the next cold storage. In addition, status information such as a time for which cooling is possible, which indicates the status 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. For example, a liquid crystal display or an organic EL display is there. The display unit 40 is disposed, 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 transmitted wirelessly from the information generation unit 31 to the information terminal of the user of the cold storage apparatus 100 or the base station centrally managing the cold storage apparatus 100. Further, the information generation unit 31 and the information storage unit 35 do not necessarily have to be installed in the cool storage device 100. Data necessary for calculating the state information of the cold storage body 10 may be transmitted from the cold storage device 100 to the information generation unit 31 installed in another place by wireless, and the state information of the cold storage body 10 may be calculated.

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

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

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

  Next, in step S <b> 2, the amount of frost formation on the surface of the box body 11 is determined by the information generation unit 31 based on the received cold storage body temperature and air temperature.

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

  After step S3, the cold storage device 100 stops cold storage and performs cold storage, and then starts cold storage again. At that time, the control device 30 performs the operation after step S4.

  In step S4, in the information generation unit 31, the coolable time of the cold storage device 100 is calculated 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 coolable time of the cold storage device 100 calculated by the information generation unit 31 is displayed on the display unit 40, and the series of operations is completed.

  FIG. 6A shows an example of a regenerative body temperature behavior at a constant air temperature when the frost formation state is changed using the cool storage device 100 of the first embodiment. In this example, the air temperature of storage room 50 shows the temperature of regenerator 10 at two levels (−19 ° C., −16 ° C.). Since the cool storage body temperature sensor 12 is installed upstream with respect to the air flow of the box body 11, the temperature of the cool storage body 10 at each air temperature shows a value higher than the melting point of the cool storage body 10, and the frost formation amount increases. As a result, the temperature of the cold storage 10 decreases. Although this was possible even if the temperature difference between the temperature of the regenerator 10 and the air temperature was small when frost formation was small to maintain the same air temperature, 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 a specific air temperature measured by the air temperature sensor 13. Furthermore, it becomes possible to display the coolable time at the time of frost formation by calculating the coolable time at the next time of cold storage which grasped the amount of frost formation.

  As a modification of the first embodiment, FIG. 6B is not shown, but a cool storage body temperature sensor 12 is installed downstream of the air flow of the box 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 disposed downstream of the air flow of the box 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 frost formation amount increases. As a result, the temperature of the cold storage 10 decreases. However, as the air temperature is lower compared to FIG. 6A, the change width of the temperature of the regenerative body 10 due to the change in the amount of frost increases. 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 since the temperature enters the phase change region from solid to liquid. Therefore, in order to detect the amount of frost formation with high accuracy by temperature detection by cool storage body temperature sensor 12, it measures and detects in the point which shows temperature which cool storage body 10 separated from melting point of cool storage body 10 to air temperature. It is desirable to do.

As described above, in the present embodiment, the storage chamber 50 is partitioned so as to be in communication with the box body 11 in which the cold storage body 10 is stored and the cold storage chamber 15 in the cold storage chamber 15. A blower 20 for circulating air into the space between the box 11 and circulating the air cooled by the regenerator 10 to the storage chamber 50, and a regenerator temperature sensor 12 for detecting the surface temperature of at least one regenerator 10; And a cold storage device characterized in that the air temperature sensor 13 for measuring the air temperature of the cool storage chamber 15 or the storage chamber 50, and the cool storage body temperature sensor 12 and the cool storage body temperature sensor 12 keep the distance of the box 11 constant. By doing this, the thermal resistance between the regenerator 10 and the box 11 can always be made constant, so the temperature of the surface temperature of the regenerator 10 and the temperature of the air of the regenerator 15 or the storage chamber 50 By measuring, so that the apparent thermal resistance which varies with frosted state. Therefore, even if the cold storage body 10 in the box 11 solidifies, melts and melts, and repeats swelling and contraction, frost formed on the surface of the box body 11 due to thermal resistance obtained from the temperature difference between the cold body surface temperature and the air temperature. Since the amount can be grasped, it is possible to grasp the coolable time of the cool storage device 100 according to the amount of frost formation.

Second Embodiment
The cool storage device 100 according to the second embodiment will be described. The second embodiment is configured in the same manner as the first embodiment except in the case where it is particularly described. The components of the second embodiment that are the same as or correspond to the components of the first embodiment are given the same reference numerals, and detailed descriptions 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, in the surface of the box body 11 on which the evaporator 26 is installed, a convex portion that protrudes toward the inside of the box body 11 at the central portion opposite to the side on which the evaporator 26 is installed. (When viewed from the outside of the box 11, a dent) is provided. With such a structure, the effect of grasping the amount of frost attached to the surface of the box 11 similar to that of the first embodiment can be obtained without using the spacer 14 used in the first embodiment, The number of parts of the cold storage device 100 can be reduced.

  In addition, when the filling rate of the cold storage body stored in the box 11 is low and there is no structure to keep the distance between the box 11 and the cold storage body temperature sensor 12 constant, the cold storage body swells and contracts due to solidification and melting. If it repeats, the fluctuation | variation of the distance of the box 11 and the cool storage body temperature sensor 12 may become large. In such a case, the spacer 14 used in the first embodiment may be disposed on the bottom of the box 11 shown in the second embodiment. By doing this, the distance between the box body 11 and the cold storage body temperature sensor 12 can be more reliably kept constant.

  As mentioned above, since it becomes possible to grasp the frost formation state on the surface of a box, the cool storage device concerning this indication can be applied to the use which stores cold heat temporarily in refrigeration or freezing.

DESCRIPTION OF SYMBOLS 10 cold storage body 10a cold storage material 10b container 11 box 12 cold storage body temperature sensor 13 air temperature sensor 14 spacer 15 cold storage room 18 temperature sensor 20 fan 21 cold air duct 25 refrigeration cycle device 26 evaporator 30 control device 31 information generation part 35 information memory Part 40 Display part 50 Storage room 60 Floor board 70 Door 100 Regenerator

Claims (5)

The cool storage room which arranged the box where the cool storage is stored,
A storage chamber partitioned so as to be in communication with the cold storage chamber and cooled by cold heat of the cold storage body;
An air temperature sensor disposed in the cool storage room or the storage room to detect the temperature of air;
A blower disposed in the cool storage room or the storage room, flowing air along the box, and circulating air cooled by the cool storage body to the storage room;
A regenerator temperature sensor disposed in contact with at least one regenerator and detecting a surface temperature of the regenerator;
A structure for keeping the distance between the cool storage temperature sensor and the box constant;
With a cold storage device. The structure is
A spacer disposed between the regenerative body temperature sensor and the box and in contact with both the regenerative body temperature sensor and the box;
The cool storage device according to claim 1. The structure is
It is a convex part which made a part of wall surface of the above-mentioned box object project toward the above-mentioned regenerative body, and was made to contact with the above-mentioned regenerative body temperature sensor,
The cool storage device according to claim 1. The structure is
The convex part which made part of the wall surface of the said box body protrude toward the said cool storage body,
A spacer disposed between the convex portion and the regenerative body temperature sensor and in contact with both the convex portion and the regenerative body temperature sensor;
Have
The cool storage device according to claim 1. further,
An information generator for calculating a time period in which the cold storage can be performed by using the air temperature detected by the air temperature sensor and the cold storage body surface temperature detected by the cold storage body temperature sensor;
A display device for displaying the coolable time;
Have
The cool storage device according to any one of claims 1 to 4.

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