JP6998528B2 - Cold storage device and cold storage state estimation method - 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.

As shown in FIG. 9, Patent Document 1 describes a cold storage body 10, a storage chamber 50, a cooling fan 20, a temperature recorder 99, and a refrigerating cycle device with the horizontal direction as the XY plane and the vertical direction as the Z axis. A cold storage device 100 including 25 is described. The refrigerating cycle device 25 includes a condenser, a condenser fan, and a compressor. The cooling fan 20 circulates air in the order of the storage chamber 50, the cold storage chamber 15, the cold air circulation duct 21, the cold air discharge port 22, and the storage chamber 50. The storage chamber 50 is kept at a low temperature by returning the air in the storage chamber 50 to the storage chamber 50 from the cold air discharge port 22 after being cooled by the cold storage body 10 stored in the cold storage chamber 10. The cold storage device 100 is placed on the truck bed in a state where the luggage to be kept cold is stored in the storage chamber 50, and is transported to the destination.

The temperature recorder 99 records each air temperature in the vicinity of the cold air discharge port 22, the vicinity of the cold storage body 10, and the vicinity of the outside air inflow portion of the condenser. When the cold storage device 100 becomes poorly cooled, the temperature history of the temperature recorder 99 is checked to find out the defective part.

Japanese Unexamined Patent Publication No. 2002-5554

If the door of the cold storage device is opened while the storage room of the cold storage device is kept cold, high-temperature air flows into the storage room from the outside. When the number of times the door is opened and closed is large or the opening time of the door is long, the temperature of the air in the storage chamber rises with a time delay from the door side to the inside side of the storage chamber. However, in the conventional technology, since the temperature in the storage chamber is measured only at one point of the cold air discharge port, the influence of the amount of luggage loaded in the cold storage device and the intrusion by the inflow air that increases with the passage of the door opening time. There was a problem that the influence of the amount of heat could not be grasped, and the state of the cold storage body during the opening of the door and immediately after the door was closed could not be grasped.

The present disclosure solves the above-mentioned conventional problems, and provides a cold storage device capable of more appropriately grasping the state of a cold storage body while the door is open and immediately after the door is closed.

This disclosure is
The cold storage room where the cold storage body is stored and the cold storage room
A storage chamber that is separated from the cold storage chamber so as to be able to communicate with the cold storage chamber and is kept cold by the cold heat of the cold storage body.
A first temperature sensor installed in the storage chamber and detecting the first air temperature in the storage chamber,
A second temperature sensor installed vertically below the first temperature sensor and detecting the second air temperature in the storage chamber, and a second temperature sensor.
A cold storage body information generation unit that generates information regarding the state of the cold storage body based on the first air temperature and the second air temperature.
Provide a cold storage device equipped with.

In the above cold storage device, there are multiple temperature sensors that detect the air temperature in the vertical direction on the door side, so the temperature sensor that detects the air temperature in the area where the luggage is dense (the lower part of the storage room) and the luggage are dense. A temperature sensor will be placed to detect the air temperature above the area (upper part of the storage chamber). When high temperature air enters the storage room from the outside of the cold storage device when the door is open, the temperature sensor above the area where the luggage is dense is larger than the amount of change in the air temperature detected by the temperature sensor in the area where the luggage is dense. The amount of change in air temperature detected in is larger. From the space volume of the upper part of the luggage when the door is opened, the amount of heat entering due to the opening of the door can be known from the product of the air heat capacity of the space and the amount of temperature change.

In addition, this disclosure is:
The cold storage room where the cold storage body is stored and the cold storage room
A storage chamber that is separated from the cold storage chamber so as to be able to communicate with the cold storage chamber and is kept cold by the cold heat of the cold storage body.
A door for accessing the storage room from the outside,
A first temperature sensor installed in the storage chamber and detecting the first air temperature in the storage chamber,
A third temperature sensor, which is installed at a position farther from the door than the first temperature sensor and detects the third air temperature in the storage chamber,
A cold storage body information generation unit that generates information regarding the state of the cold storage body based on the first air temperature and the third air temperature.
Provide a cold storage device equipped with.

In the above-mentioned cold storage device, since there are a plurality of temperature sensors for detecting the air temperature in the upper part of the storage chamber, the temperature sensors are arranged from the door side toward the inside of the storage chamber. When high-temperature air enters the storage room from the outside of the cold storage device when the door is open, the temperature rises in order from the detection temperature of the first temperature sensor installed on the door side. From the product of the air heat capacity of the space where the temperature sensor where the detected air temperature has risen and the amount of temperature change, the amount of heat entering due to the opening of the door can be known, and the state of the cold storage body while the door is open can be known.

The cold storage device of the present disclosure can more appropriately grasp the state of the cold storage body during the opening of the door and immediately after the door is closed.

Cross-sectional view of the cold storage device according to the first embodiment on the XZ plane. Cross-sectional view of the cold storage device according to the first embodiment on the YZ plane. Flow chart showing the operation of the cold storage device A graph showing an example of the detection results of the first temperature sensor and the second temperature sensor when the door of the cold storage device according to the first embodiment is opened. A graph showing an example of the detection results of the first temperature sensor and the second temperature sensor at the time of unloading the cold storage device according to the first embodiment. Cross-sectional view of the cold storage device according to the second embodiment on the XZ plane. Cross-sectional view of the cold storage device according to the second embodiment on the YZ plane. A graph showing an example of the detection results of the first temperature sensor, the third temperature sensor, and the wall surface temperature sensor of the cold storage device according to the second embodiment. Cross-sectional view of the cold storage device according to the prior art on the XZ plane

The first aspect of the present disclosure is an external access to a cold storage chamber in which a cold storage body is stored, 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 storage chamber. A door for this purpose, a first temperature sensor installed at the upper part of the storage chamber and on the door side to detect the first air temperature in the storage chamber, and a vertical lower side of the first temperature sensor and the door. A second temperature sensor installed on the side that detects the second air temperature in the storage chamber, and a cold storage that generates information on the state of the cold storage body based on the first air temperature and the second air temperature. Provided is a cold storage device provided with a body information generation unit.

According to the first aspect, since there are a plurality of temperature sensors that detect the air temperature in the vertical direction on the door side, the temperature sensor and the luggage that detect the air temperature in the area where the luggage is dense (lower part of the storage chamber) A temperature sensor will be placed to detect the air temperature above the dense area (upper part of the storage chamber). When high temperature air enters the storage room from the outside of the cold storage device when the door is open, the temperature sensor above the area where the luggage is dense is larger than the amount of change in the air temperature detected by the temperature sensor in the area where the luggage is dense. The amount of change in air temperature detected in is larger. From the space volume of the upper part of the luggage when the door is opened, the amount of heat entering due to the opening of the door can be known from the product of the air heat capacity of the space and the amount of temperature change. Therefore, even if the door is opened with different heights of the cargo loaded in the storage room when the storage room is kept cold, the state of the cold storage body during the opening of the door and immediately after the door is closed can be grasped more appropriately.

In the second aspect of the present disclosure, in addition to the first aspect, a wall surface temperature sensor installed at the upper part of the storage chamber and closer to the wall surface of the storage chamber than the first temperature sensor to detect the temperature of the wall surface. To provide a cold storage device further equipped with.

According to the second aspect, when the number of times the door is opened and closed is increased or the door opening time is further extended, the temperature rise of the space in the storage chamber becomes saturated, and then the wall surface constituting the storage chamber and the high temperature are high. As the heat exchange of air progresses, the detected air and the temperature sensor whose wall temperature has risen by grasping the temperature behavior of the wall surface temperature sensor whose temperature rises later than the temperature rise of the first temperature sensor and the second temperature sensor. From the product of the air heat capacity of the space where the space is installed or the heat capacity of the wall and the amount of temperature change, the amount of heat entering due to the opening of the door can be known. Therefore, even if the door is opened and closed more frequently and the door is opened and closed for a long time, the amount of cold storage of the cold storage body can be detected while the door is open.

A third aspect of the present disclosure is an external access to the cold storage chamber in which the cold storage body is stored, a storage chamber that is partitioned so as to be communicable with the cold storage chamber and is kept cold by the cold heat of the cold storage body, and the storage chamber. A door for this purpose, a first temperature sensor installed above the storage chamber and on the door side to detect the first air temperature in the storage chamber, and a first temperature sensor above the storage chamber and above the first temperature sensor. A third temperature sensor installed on the inner side of the storage chamber to detect the third air temperature in the storage chamber, and the state of the cold storage body based on the first air temperature and the third air temperature. Provided is a cold storage device provided with a cold storage body information generation unit for generating information.

According to the third aspect, since there are a plurality of temperature sensors for detecting the air temperature in the upper part of the storage chamber, the temperature sensors are arranged from the door side toward the inside of the storage chamber. When high-temperature air enters from the outside of the cold storage device when the door is open, the temperature rises in order from the temperature detected by the temperature sensor installed on the door side. From the product of the air heat capacity of the space where the temperature sensor where the detected air temperature has risen and the amount of temperature change, the amount of heat entering due to the opening of the door can be known. Therefore, even if the number of times the door is opened and closed and the door opening time change when the storage room is kept cold, the amount of cold storage of the cold storage body can be detected while the door is open.

In addition to the third aspect, the fourth aspect of the present disclosure is a wall surface temperature sensor installed at the upper part of the storage chamber and closer to the wall surface of the storage chamber than the first temperature sensor to detect the temperature of the wall surface. To provide a cold storage device further equipped with.

According to the fourth aspect, when the number of times the door is opened and closed is increased or the door opening time is further extended, the temperature rise of the space in the storage chamber becomes saturated, and then the wall surface constituting the storage chamber and the high temperature are high. As the heat exchange of air progresses, the detected air and the temperature sensor whose wall temperature has risen by grasping the temperature behavior of the wall surface temperature sensor whose temperature rises later than the temperature rise of the first temperature sensor and the third temperature sensor. From the product of the air heat capacity of the space where the space is installed or the heat capacity of the wall and the amount of temperature change, the amount of heat entering due to the opening of the door can be known. Therefore, even if the door is opened and closed more frequently and the door is opened and closed for a long time, the amount of cold storage of the cold storage body can be detected while the door is open.

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 to this embodiment. In the attached 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 XZ plane of the cold storage device 100 according to the first embodiment. FIG. 2 is a cross-sectional view of the YZ plane of the cold storage device 100 according to the first embodiment of the present invention. Here, the X-axis indicates a direction from the inside of the storage chamber 50 of the cold storage device 100 toward the door 70, the Y-axis indicates a direction perpendicular to the X-axis with respect to the horizontal plane, and the Z-axis indicates a direction vertically upward.

As shown in FIGS. 1 and 2, the cold storage device 100 includes a storage chamber 50 and a cold storage chamber 15, and the space between them is partitioned by a floor plate 60. A cold storage body 10 is arranged in the cold storage chamber 15. A refrigerating cycle device 25 for cooling the cold storage body 10 is installed above the cold storage device 100. Although not shown, the refrigeration cycle device 25 includes a compressor, a condenser, a condenser blower, an evaporator, and the like. When the refrigerating cycle device 25 operates, an evaporator arranged so as to be in contact with the cold storage body 10 creates a low temperature environment and cools the cold storage body 10.

One side of the wall constituting the storage chamber 50 is configured by a door 70 so that the storage chamber 50 can be accessed from the outside of the cold storage device 100. By opening the door 70, the cargo is stored in the storage chamber 50, and the cargo is transported to the destination in a state where the cargo 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 air is exchanged with the cold storage body 10 stored in the refrigeration cycle 25 to exchange heat with the cold air duct. By passing through 21 and returning to the storage chamber 50, the inside of the storage chamber 50 is maintained at a constant temperature. When the door 70 is open, the blower 20 is stopped in order to prevent the cold heat of the cold storage body 10 from unnecessarily escaping to the outside of the cold storage device 100. 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. The blower 20 is controlled so that the storage chamber is maintained at a desired constant temperature.

As shown in FIGS. 1 and 2, the first temperature sensor 11 is installed so as to detect the air temperature at the position of the lower part of the blower 20 at the upper part of the storage chamber 50 on the door 70 side. The second temperature sensor 12 detects the air temperature at the center of the height of the left wall of the storage chamber 50 at the lower part of the first temperature sensor 11 as shown in FIG. 2, and / or the air at the lower part of the left wall. It has a second temperature sensor 12b to detect the temperature. The door 70 of the cold storage device 100 during cold storage is opened, and the amount of luggage loaded into the storage room 50 is different each time. However, since the upper part of the storage chamber 50 is always a space, the first temperature sensor 11 is installed in the upper part of the storage chamber 50. Further, since the high temperature air invades from the door 70 side by opening the door 70 and the temperature of the air in the storage chamber 50 rises from the door 70 side, the first temperature sensor 11 is installed on the door 70 side.

When the door 70 is opened when the storage chamber 50 is kept cold, high-temperature air flows in in order from the door 70 side in the storage chamber 50, and the air temperature rises in order from the place where the high-temperature air reaches. For example, if there is a luggage height between the first temperature sensor and the second temperature sensor, the detection results of the first temperature sensor, which has a rapid temperature rise after opening the door, and the second temperature sensor, which has a slow temperature rise, can be obtained. Therefore, from the result, it can be estimated that the load is loaded between the first temperature sensor and the second temperature sensor, and it can be estimated that the space volume is from the height to the ceiling of the storage room. .. By multiplying the air heat capacity of the space by the amount of temperature change detected by each temperature sensor, the amount of heat entering by air can be grasped while the door is open.

The cold storage device 100 includes a cold storage body information generation unit 30, an information storage unit 35, and a display unit 40. Information indicating the temperature detected by the first temperature sensor 11 and the second temperature sensor 12 when the door 70 of the cold storage device 100 is opened is input to the cold storage body information generation unit 30. The cold storage body information generation unit 30 has the air temperature of the storage chamber 50 detected by the first temperature sensor 11 and the second temperature sensor 12, and the state information of the cold storage body 10 when the door 70 is opened stored by the information storage unit 35. Based on the above, state information indicating the state of the cold storage body 10 while the door 70 is open is generated. Regarding the method of obtaining the state information of the cold storage body 10 stored in the information storage unit 35, for example, the cold storage amount of the cold storage body 10 calculated from the temperature of the cold storage body 10 is stored. The display unit 40 displays the state information generated by the cold storage body information generation unit 30. Since the cold storage body information generation unit 30 of the cold storage device 100 calculates the state information indicating the cold storage amount of the cold storage body 10 as described above, the door 70 is used when loading the luggage into the storage chamber 50 or when taking out the luggage. Even if the invading heat enters from the outside of the cold storage device 100 by opening the door, the state of the cold storage body 10 can be grasped.

The state information of the cold storage body 10 includes the amount of cold storage, the usable time that can keep the storage chamber 50 below a predetermined temperature, and if the cold storage body 10 is in the process of storing cold, a predetermined amount of the cold storage body 10 is stored. It is at least one of the times required for 10 to solidify. The amount of cold storage roughly corresponds to the total solidification heat or the ratio to the total heat of fusion accompanying the phase change from the liquid to the solid or from the solid to the liquid of the cold storage body 10 stored in the plurality of boxes 11. For example, if the ratio of liquid and solid is 50%, the cold storage amount is 50%. Further, since the cooling temperature at the time of storing the cold storage body 10 is usually set lower than the freezing point of the cold storage body 10, when the cold storage time becomes long, the cold storage body 10 solidifies and then is further cooled to the freezing point or lower. Further, since the cold insulation temperature of the storage chamber 50 is higher than the melting point of the cold storage body 10, not only latent heat but also sensible heat can be effectively utilized as cold heat for cold insulation. Therefore, the cold storage amount may be calculated as the sensible heat storage amount according to the latent heat content of the cold storage body 10.

The type of 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.

As shown in FIGS. 1 and 2, the first temperature sensor 11 and the second temperature sensor 12 are connected to the cold storage body information generation unit 30 so as to be able to communicate by wire or wirelessly. Therefore, information indicating the temperature detected by the first temperature sensor 11 and the second temperature sensor 12 is input to the cold storage body information generation unit 30. The cold storage information generation unit 30 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. As described above, the cold storage body information generation unit 30 generates state information indicating the cold storage amount of the cold storage body 10. As shown in FIGS. 1 and 2, the cold storage body information generation unit 30 is connected to the information storage unit 35 and the display unit 40 by a communication cable, and outputs state information indicating the state of the cold storage body 10 to the display unit 40. do. The display unit 40 is not particularly limited, but is, for example, a liquid crystal display or an organic EL display. 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 cold storage body information generation unit 30 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 cold storage body information generation unit 30 and the information storage unit 35 do not necessarily have to be installed in the cold storage device 100, and data necessary for calculating the state information of the cold storage body 10 can be wirelessly obtained from the cold storage device 100. It may be transmitted to the cold storage body information generation unit 30 installed in the place and the state information of the cold storage body 10 may be calculated.

The operation and operation of the cold storage device 100 configured as described above will be described below.

This operation is performed when the door 70 is opened while the storage chamber 50 of the cold storage device 100 is kept cold at a certain temperature. As shown in FIG. 3, when a predetermined condition is satisfied, the cold storage device 100 starts an operation for displaying the state of the cold storage body 10. Here, the predetermined conditions are that the storage chamber 50 is kept cold below a predetermined temperature, that is, the cold storage device 100 loads the luggage to be kept cold into the storage chamber 50 and is in a state where it can be kept cold, and the door 70. Was released.

First, in step S1, the opening of the door 70 is detected. As a detection method, for example, there is a method of providing a mechanical door switch between the door 70 and the storage chamber 50.

Next, in step S2, the state of the cold storage body 10 such as the amount of cold storage at the start of opening the door 70 is grasped from the information storage unit 35.

In step S3, the temperature change of the first temperature sensor 11 and the second temperature sensor 12 is detected.

In step S4, the luggage height, that is, the space volume in the storage chamber 50 is calculated from the temperature behavior of the detected temperatures of the first temperature sensor 11 and the second temperature sensor 12.

Then, in step S5, the intrusion heat due to the opening of the door 70 is calculated from the temperature change amount of the detected temperature of the first temperature sensor 11 and the second temperature sensor 12 and the space volume.

In step S6, the state of the cold storage body 10 while the door 70 is open is calculated from the state of the cold storage body 10 when the door 70 is opened by S2 and the invading heat by S5.

Finally, in step S7, the state information of the cold storage body 10 is displayed on the display unit 40, and a series of operations is completed.

In FIG. 4, the cold storage device 100 of the first embodiment is used to keep the storage chamber 50 cold, load a predetermined load, open the door 70 at the time ts, and close the door 70 at the time te. An example of the temperature behavior of the temperature sensor 11 and the second temperature sensor 12 is shown. In this example, the cargo is loaded between the second temperature sensor a12a and the second temperature sensor b12b. At the same time as the door 70 is opened, the detection temperatures of the first temperature sensor 11 and the second temperature sensor a12a rise, and then the temperature becomes constant. This is because high-temperature air entered the storage chamber 50 from the outside of the cold storage device 100 by opening the door 70, and was exposed to the air while the door 70 was opened. However, the temperature of the second temperature sensor b12b does not rise as much as that of the first temperature sensor 11 and the second temperature sensor a12a, although a slight temperature rise is observed after the door 70 is opened. This is because the cargo is loaded up to a position higher than the second temperature sensor b12b, and the influence of the high temperature air from the outside is suppressed by the cargo. In this way, the load height can be estimated from the temperature behavior of the first temperature sensor 11, the second temperature sensor a12a, and the second temperature sensor b12b when the door 70 is opened. The invading heat due to the opening of the door 70 can be calculated by the product of the temperature change of the detection temperature of the first temperature sensor 11 or the second temperature sensor 12 before the opening of the door 70 and the air heat capacity of the space. The cold storage amount when the door 70 is opened can be calculated by subtracting the invading heat from the cold storage amount when the door 70 is opened. The space volume is the remaining space volume of the storage chamber 50 with respect to the luggage height, and the space volume may be calculated in advance from the installation locations of the first temperature sensor 11 and the second temperature sensor 12. Although the case where the second temperature sensor 12 has two temperature sensors has been described in this embodiment, the number of second temperature sensors 12 installed may be increased in order to detect the space volume with high accuracy.

FIG. 5 shows another example when the door 70 of the first embodiment is opened. In this example, when the door 70 is opened, the load is loaded between the first temperature sensor 11 and the second temperature sensor a12a, and the load height drops in time t1 and time t2 due to unloading while the door 70 is open. ing. When the door 70 is opened, only the temperature detected by the first temperature sensor 11 rises. At time t1, the height of the cargo decreased and at the same time the detected temperature of the second temperature sensor a12a increased. This is because the temperature detected by the second temperature sensor a12a has risen due to the high temperature air from the outside of the cold storage device 100 because the cargo that had been in the vicinity of the second temperature sensor a12a has disappeared. Similarly, at time t2, the luggage is exhausted and the detection temperature of the second temperature sensor b12b is rising. The invading heat due to the opening of the door 70 depends on the product of the temperature change of the detected temperature of the first temperature sensor 11 or the second temperature sensor 12 before the opening of the door 70 and the air heat capacity of the space at the time of calculation in the same manner as in FIG. Can be calculated.

As described above, in the present embodiment, the cold storage device 100 is partitioned so as to be communicable with the cold storage chamber 15 in which the cold storage body 10 is housed and the cold storage chamber 15, and is cooled by the cold heat of the cold storage body 10. A first storage chamber 50 is detected, a door 70 for accessing the storage chamber 50 from the outside of the cold storage device 100, and an air temperature installed on the door 70 side in the upper part of the storage chamber 50. By the temperature sensor 11, one or more second temperature sensors 12 installed at the lower part of the first temperature sensor 11 in the direction of gravity, and the temperature detected from the first temperature sensor 11 and the second temperature sensor 12. The cold storage device 100 is characterized by having a cold storage body information generation unit 30 that generates cold storage body 10 information, so that there are a plurality of temperature sensors that detect the air temperature in the vertical direction on the door 70 side. , A temperature sensor that detects the air temperature in which the luggage is densely packed, and a temperature sensor that detects the air temperature in the space above the space where the luggage is loaded will be arranged. When high temperature air enters from the outside of the cold storage device 100 when the door 70 is opened, the amount of change in the air temperature detected by the temperature sensor at the top of the luggage is larger than the air temperature detected by the temperature sensor where the luggage is dense. Become. From the space volume of the upper part of the luggage when the door 70 is opened, the amount of heat entering due to the opening of the door 70 can be known from the product of the air heat capacity of the space and the amount of temperature change. Therefore, even if the door 70 is opened in a state where the heights of the luggage loaded in the storage chamber 50 are different when the storage chamber 50 is kept cold, the cold storage amount of the cold storage body 10 can be detected while the door 70 is opened.

(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 it is not technically inconsistent.

FIG. 6 shows a cross-sectional view of the XZ plane of the cold storage device 100 according to the second embodiment of the present invention. FIG. 7 is a cross-sectional view of the YZ plane of the cold storage device 100 according to the second embodiment of the present invention.

As shown in FIGS. 6 and 7, the first temperature sensor 11 is installed so as to detect the air temperature at the position of the lower part of the blower 20 at the upper part of the storage chamber 50 on the door 70 side as in the first embodiment. Has been done. A third temperature sensor 13 is installed on the inner side of the storage chamber 50 at the same height as the first temperature sensor 11. Further, a wall surface temperature sensor 14 for detecting the wall surface temperature in the vicinity of the first temperature sensor 11 is installed.

When the door 70 is opened when the storage chamber 50 is kept cold, high-temperature air flows in in order from the door 70 side in the storage chamber 50, and the air temperature rises in order from the place where the high-temperature air reaches. The detection temperature of the first temperature sensor 11 installed on the door 70 side rises at the same time as the door 70 is opened. In particular, when the ambient temperature of the cold storage device 100 is low and the temperature difference from the cold storage temperature in the storage chamber 50 is small, the speed of flow from the door 70 side into the storage chamber 50 also slows down, so that the time after the door 70 is opened Due to the delay, the detection temperature of the third temperature sensor 13 installed inside the storage chamber 50 rises. Further, when the door 70 opening time becomes long, the air temperature in the storage chamber 50 becomes substantially the same as the ambient temperature, and then the detection temperature of the wall surface temperature sensor 14 rises due to heat exchange between the wall surface constituting the storage chamber 50 and the air. I will do it. As a result, the heat capacity of the air whose temperature is changing from the detected temperature behavior of the first temperature sensor 11, the third temperature sensor 12 and the wall surface temperature sensor 14, or the heat capacity of the wall of the storage chamber 50 and the amount of invading heat are obtained from the amount of change in the detected temperature. It can be grasped while the door 70 is open.

FIG. 8 shows an example of the detected temperature behavior of the first temperature sensor 11, the third temperature sensor 13, and the wall surface temperature sensor 14 when the door 70 of the second embodiment is opened. It can be seen that when the door 70 is opened at the time ts, the detection temperatures of the third temperature sensor 13 and the wall surface temperature sensor 4 increase in order from the first temperature sensor 11. As described above, the heat entering from the outside due to the opening of the door 70 is the heat capacity of air or the wall from the installation positions of the first temperature sensor 11, the third temperature sensor 13 and the wall surface temperature sensor 14, whose temperature has risen at the time of calculation. And, it can be calculated by the product of the amount of change in the detected temperature.

As described above, in the present embodiment, the cold storage device 100 is partitioned so as to be communicable with the cold storage chamber 50 in which the cold storage body 10 is housed and the cold storage chamber 15, and is cooled by the cold heat of the cold storage body 10. A first to detect the temperature of the storage chamber 50, the door 70 for accessing the storage chamber 50 from the outside of the cold storage device 100, and the air temperature installed on the door 70 side in the upper part of the storage chamber 50. The temperature sensor 11, one or more third temperature sensors 13 installed on the inner side of the storage chamber 50 from the first temperature sensor 11 at the upper part in the storage chamber 50, and the first temperature sensor 11. The cold storage device 100 is provided with a cold storage body information generation unit 30 that generates cold storage body 10 information based on the temperature detected from the third temperature sensor 13, so that the air temperature is above the storage chamber 50. Since there are a plurality of temperature sensors for detecting the temperature, the temperature sensors are arranged from the door 70 side toward the inside of the storage chamber 50. When high-temperature air enters from the outside of the cold storage device 100 when the door 70 is opened, the temperature rises in order from the detection temperature of the temperature sensor installed on the door 70 side. From the product of the air heat capacity of the space where the temperature sensor where the detected air temperature has risen and the amount of temperature change, the amount of heat entering due to the opening of the door 70 can be known. Therefore, even if the number of times the door 70 is opened and closed and the door 70 opening time change when the storage chamber 50 is kept cold, the cold storage amount of the cold storage body 10 can be detected while the door 70 is open.

Further, in the present embodiment, the cold storage device 100 includes one or more wall surface temperature sensors 14 that detect the wall surface temperature in the storage chamber 50, and the wall surface temperature sensor 14 is said from the door 70 side. By using the cold storage device 100 installed on the inner side of the upper part of the storage chamber 50, the temperature of the space inside the storage chamber 50 when the number of times the door 70 is opened and closed is larger or the opening time of the door 70 is further longer. The rise becomes saturated, and after that, heat exchange between the wall surface constituting the storage chamber 50 and the high temperature air proceeds, so that the temperature rise is delayed from the temperature rise of the first temperature sensor 11, the second temperature sensor 12, and the third temperature sensor 13. By grasping the temperature behavior of the wall surface temperature sensor 14 whose temperature rises, the door 70 is opened from the detected air, the air heat capacity of the space where the temperature sensor whose wall surface temperature has risen, or the product of the heat capacity of the wall and the amount of temperature change. The amount of heat invaded by is known. Therefore, even if the door 70 is opened and closed more frequently and the door 70 is opened and closed for a long time, the cold storage amount of the cold storage body 10 can be detected while the door 70 is open.

Further, by using the cold storage amount of the cold storage body 10, it is possible to detect the cold storage usable time while the door 70 is being opened or immediately after the door 70 is opened and closed. It is possible to detect the time to reach the completion of cold storage.

Needless to say, the wall surface temperature sensor 14 can be applied to the first embodiment.

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

10 Cold storage body 11 1st temperature sensor 12 2nd temperature sensor 12a 2nd temperature sensor a
12b 2nd temperature sensor b
13 Third temperature sensor 14 Wall temperature sensor 15 Cold storage room 20 Blower 21 Cold air duct 25 Refrigeration cycle device 30 Cold storage body information generation unit 35 Information storage unit 40 Display unit 50 Storage room 60 Floor board 70 Door 99 Temperature recorder 100 Cold storage device

Claims (6)

The cold storage room where the cold storage body is stored and the cold storage room
A storage chamber that is separated from the cold storage chamber so as to be able to communicate with the cold storage chamber and is kept cold by the cold heat of the cold storage body.
A first temperature sensor installed in the storage chamber and detecting the first air temperature in the storage chamber,
A second temperature sensor installed vertically below the first temperature sensor and detecting the second air temperature in the storage chamber, and a second temperature sensor.
A wall temperature sensor installed closer to the wall surface of the storage chamber than the first temperature sensor and detecting the temperature of the wall surface, and a wall surface temperature sensor.
A cold storage body information generation unit that generates information regarding the state of the cold storage body based on the first air temperature and the second air temperature.
Equipped with a cold storage device. The cold storage room where the cold storage body is stored and the cold storage room
A storage chamber that is separated from the cold storage chamber so as to be able to communicate with the cold storage chamber and is kept cold by the cold heat of the cold storage body.
A door for accessing the storage room from the outside,
A first temperature sensor installed in the storage chamber and detecting the first air temperature in the storage chamber,
A third temperature sensor, which is installed at a position farther from the door than the first temperature sensor and detects the third air temperature in the storage chamber,
A wall temperature sensor installed closer to the wall surface of the storage chamber than the first temperature sensor and detecting the temperature of the wall surface, and a wall surface temperature sensor.
A cold storage body information generation unit that generates information regarding the state of the cold storage body based on the first air temperature and the third air temperature.
Equipped with a cold storage device. The temperature change is detected by the first temperature sensor arranged in the storage chamber that can communicate with the cold storage chamber in which the cold storage body is stored.
In the storage chamber, a second temperature sensor arranged below the first temperature sensor is made to detect a temperature change, and the temperature change is detected.
The cold storage state of the cold storage body is estimated based on the first temperature change, which is the temperature change detected by the first temperature sensor, and the second temperature change, which is the temperature change detected by the second temperature sensor.
Cold storage state estimation method. The temperature of the cold storage body is detected, and the temperature is detected.
Based on the detected temperature of the cold storage body, the cold storage amount of the cold storage body is estimated.
The cold storage state estimation method according to claim 3 , wherein the cold storage state is estimated based on the cold storage amount, the first temperature change, and the second temperature change. Based on the first temperature change and the second temperature change, the invading heat from the outside of the storage chamber is estimated.
The cold storage state estimation method according to claim 4 , wherein the cold storage state is estimated based on the cold storage amount and the invading heat. A wall temperature sensor installed closer to the wall surface of the storage chamber than the first temperature sensor detects the temperature of the wall surface.
The cold storage state estimation method according to any one of claims 3 to 5 , wherein the cold storage state is estimated based on the temperature of the wall surface.

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