JP7363672B2 - cooling system - Google Patents

Description

TECHNICAL FIELD This disclosure relates to cooling systems.

Patent Document 1 discloses a cold box in which a cooling device for cooling the air inside the cold box is attached. This cold box has a box body and a lid body that opens and closes an opening of the box body.

Unexamined Japanese Patent Publication No. 2017-150700

By the way, during cool-down in which the temperature inside the cold storage box is lowered by the cooling device, the higher the blowing capacity of the blowing fan that blows out the air cooled by the cooling device into the refrigerator, the greater the refrigerating capacity of the cooling device.

On the other hand, if the blowing capacity of the blowing fan is high during cool-down, there is a trade-off in that the air inside the cold storage box is likely to leak to the outside through the gap between the box body and the lid body. In particular, if the air inside the refrigerator leaks to the outside when the difference between the outside temperature and the inside temperature is large, the loss of heat due to ventilation becomes excessive.

On the other hand, in the cooling device of Patent Document 1, the blowing fan is simply controlled so that the temperature inside the refrigerator is maintained at the set temperature, and no consideration is given to the loss of heat due to air leakage from the cold storage box. .

An object of the present disclosure is to provide a cooling system that can reduce the temperature inside a cold storage box while suppressing loss of heat due to gas leakage from the inside of the cold storage box.

The invention according to claim 1 includes:
A cooling system,
A cold storage box (2) that accommodates a cold storage object and has an opening (210) for taking in and taking out the cold storage object and an opening/closing lid (22) that opens and closes the opening;
It includes a cooling unit (38) that cools the gas collected from the inside of the cold storage box, a blowing fan (40) that blows out the gas cooled by the cooling unit into the cold storage, and a control device (46) that controls the blowing fan. A cooling device (3);
During cool-down, in which the temperature inside the cold storage box is lowered by the gas that has been cooled in the cooling section, the control device detects when the temperature inside the cold storage box falls below a reference temperature, which is set higher than the target temperature of the cold storage box. , the blowing capacity of the blowing fan is reduced.
When the effective refrigerating capacity is calculated by subtracting the heat loss due to gas leakage from the cold storage box from the refrigerating capacity of the cooling device,
The reference temperature is set to an internal temperature at which it is assumed that a higher effective refrigerating capacity will be exhibited when the air blowing capacity is lowered than when the air blowing capacity is maintained.

According to this, during cool-down, the blowing capacity of the blowing fan decreases before the temperature inside the cold storage box reaches the target temperature, so when the inside temperature difference between the outside temperature and the inside temperature is large, Gas leakage to the outside is suppressed. Therefore, according to the cooling system of the present disclosure, it is possible to reduce the temperature inside the cold storage box while suppressing heat loss due to gas leakage from the inside of the cold storage box.

The invention according to claim 2 is
A cooling system,
A cold storage box (2) that accommodates a cold storage object and has an opening (210) for taking in and taking out the cold storage object and an opening/closing lid (22) that opens and closes the opening;
It includes a cooling unit (38) that cools the gas collected from the inside of the cold storage box, a blowing fan (40) that blows out the gas cooled by the cooling unit into the cold storage, and a control device (46) that controls the blowing fan. A cooling device (3);
During cool-down, when the temperature inside the cold storage box is lowered by the gas that has been cooled in the cooling section, the control device determines whether the difference between the inside and outside temperature between the inside temperature and the outside temperature is the same as the target temperature of the cold storage box and the outside temperature. When the temperature exceeds a reference value, which is set to a value smaller than the temperature difference, the blowing capacity of the blowing fan is reduced.

As a result, during cool-down, the blowing capacity of the blowing fan decreases before the temperature inside the cold storage box reaches the target temperature, so when there is a large temperature difference between the outside temperature and the inside temperature, Gas leakage to the outside is suppressed. Therefore, according to the cooling system of the present disclosure, it is possible to reduce the temperature inside the cold storage box while suppressing heat loss due to gas leakage from the inside of the cold storage box.

Note that the reference numerals in parentheses attached to each component etc. indicate an example of the correspondence between the component etc. and specific components etc. described in the embodiments to be described later.

FIG. 1 is a schematic perspective view of a cooling system according to a first embodiment. It is a typical perspective view showing the state where right side part of a cooling device of a 1st embodiment was removed. It is a typical front view showing the state where the right side part of the cooling device of a 1st embodiment is removed. 4 is a sectional view taken along line IV-IV in FIG. 3. FIG. It is a typical perspective view of the cold storage box of a 1st embodiment. It is a typical sectional view of the cold storage box of a 1st embodiment. It is an explanatory view for explaining constituent materials of a cold storage box of a 1st embodiment. FIG. 1 is a schematic block diagram of a control device for a cooling system according to a first embodiment. FIG. 3 is an explanatory diagram for explaining the flow of air when the inside of the cold box is cooled by the cooling device. FIG. 2 is an explanatory diagram for explaining the relationship among the refrigerating capacity of the cooling device, the blowing capacity of the blowing fan, and the temperature inside the refrigerator. FIG. 2 is an explanatory diagram for explaining the relationship between heat loss due to air leakage from the inside of the refrigerator, blowing capacity of a blowing fan, and temperature inside the refrigerator. FIG. 2 is an explanatory diagram for explaining the relationship between effective refrigerating capacity, blowing capacity of a blowing fan, and internal temperature. 3 is a flowchart showing the flow of fan control processing executed by the control device of the first embodiment. FIG. 2 is an explanatory diagram for explaining changes in internal temperature during cool-down. FIG. 2 is an explanatory diagram for explaining the relationship between the refrigerating capacity of the cooling device, the blowing capacity of the blowing fan, and the difference in temperature between the inside and outside. FIG. 2 is an explanatory diagram for explaining the relationship between heat loss due to air leakage from inside the refrigerator, blowing capacity of a blowing fan, and temperature difference between inside and outside. FIG. 3 is an explanatory diagram for explaining the relationship between effective refrigerating capacity, blowing capacity of a blowing fan, and temperature difference between inside and outside. It is a flowchart which shows the flow of fan control processing performed by the control device of a 2nd embodiment.

Embodiments of the present disclosure will be described below with reference to the drawings. In the following embodiments, parts that are the same or equivalent to those described in the preceding embodiments are given the same reference numerals, and their explanations may be omitted. Further, in the embodiment, when only some of the constituent elements are described, the constituent elements explained in the preceding embodiment can be applied to other parts of the constituent element. The following embodiments can be partially combined with each other, even if not explicitly stated, as long as the combination does not cause any problems.

(First embodiment)
This embodiment will be described with reference to FIGS. 1 to 14. The arrows indicating up and down shown in the drawings indicate the up and down direction DR1 based on the direction of gravity when the cooling system 1 is used. Further, each arrow indicating front and rear, left and right in the drawings indicates a front and rear direction DR2 and a left and right direction DR3 based on a direction conveniently determined as the front in the cooling system 1. Note that the vertical direction DR1 does not limit the attitude of the cooling system 1 in situations where the cooling system 1 is not actually used, such as during manufacturing, sales, and transportation. Further, the front-rear direction DR2 and the left-right direction DR3 do not limit the actual posture of the cooling system 1.

The cooling system 1 has a size and weight that can be carried by a person. The cooling system 1 can be carried into and out of the loading platform of a transport truck, for example. In other words, the cooling system 1 is a small mobile cooling system. As shown in FIG. 1, the cooling system 1 includes a cold box 2 and a cooling device 3.

The cooling device 3 is a device that collects air from the cooling chamber 2x inside the cold box 2, cools it outside the cold box 2, and supplies the cooled air to the cooling chamber 2x. The cooling device 3 is arranged outside the cold box 2.

As shown in FIGS. 2 and 3, the cooling device 3 includes a casing 31, a battery 32, a first partition member 33, a second partition member 34, a compressor 35, a condenser 36, an expansion valve 37, and an evaporator 38. There is. The cooling device 3 also includes an exhaust fan 39, a blow-off fan 40, a drain pan 41, an evaporating dish 42, an inverter 43, and a control device 46.

The casing 31 is a member that constitutes the outer shell of the cooling device 3. Casing 31 houses the main components of cooling device 3. The outer shape of the cooling device 3 is approximately a rectangular parallelepiped. The length of the cooling device 3 in the left-right direction DR3 is shorter than the length in the up-down direction DR1 and the length in the front-back direction DR2.

The casing 31 faces the cold box 2 such that one of its four side surfaces is in contact with one side of the cold box 2 . The casing 31 has an upper surface section 311 , a lower surface section 312 , a front surface section 313 , a rear surface section 314 , a right side surface section 315 , and a left side surface section 316 . The casing 31 faces the cold box 2 such that the left side surface portion 316 is in contact with the cold box 2 .

As shown in FIGS. 1 and 2, an outside air introduction hole 313a is formed in the front side portion 313 of the casing 31. As shown in FIGS. The outside air introduction hole 313a is a hole that introduces air from the outside of the casing 31 into the capacitor 36 inside the casing 31.

As shown in FIGS. 1 and 4, an outside air exhaust hole 315a is formed in the right side portion 315 of the casing 31. As shown in FIGS. The outside air discharge hole 315a is a hole through which air that has exchanged heat with the refrigerant in the condenser 36 is discharged to the outside of the casing 31.

An inside air recovery hole 316a and an inside air supply hole 316b are formed in the left side surface portion 316 of the casing 31. The inside air recovery hole 316a is a hole through which air recovered from the cooling chamber 2x inside the cold box 2 to the cooling device 3 passes. The inside air supply hole 316b is a hole through which air is supplied from the cooling device 3 to the cooling chamber 2x inside the cold box 2. The inside air supply hole 316b is formed above the inside air recovery hole 316a.

Furthermore, a recovery duct 317 and a supply duct 318 are formed in the left side surface portion 316 of the casing 31, as shown in FIG.

The recovery duct 317 is a tube-shaped member that protrudes outward from the left side surface portion 316 of the casing 31 so as to surround the inside air recovery hole 316a. One end of the recovery duct 317 is connected to the left side surface 316 of the casing 31 . The other end of the recovery duct 317 is press-fitted into a recovery communication hole 213a of the cold box 2, which will be described later.

The supply duct 318 is a tube-shaped member that protrudes outward from the left side surface portion 316 of the casing 31 so as to surround the inside air supply hole 316b. The supply duct 318 has one end connected to the left side surface 316 of the casing 31 . The other end of the supply duct 318 is press-fitted into a supply communication hole 213b of the cold box 2, which will be described later.

The cooling device 3 is disposed outside the cold box 2 and is detachably attached to the cold box 2. Specifically, the cooling device 3 is attached to the cold storage box 2 by press-fitting a recovery duct 317 and a supply duct 318 into a recovery communication hole 213a and a supply communication hole 213b of the cold storage box 2, which will be described later. The cooling device 3 can be removed from the cold box 2 by removing the recovery duct 317 and the supply duct 318 from a recovery communication hole 213a and a supply communication hole 213b of the cold box 2, which will be described later.

As shown in FIGS. 2 and 3, the battery 32 is placed outside the casing 31. The battery 32 is arranged adjacent to a rear side surface part 314 of the casing 31 on the opposite side to the front side surface part 313 in which the outside air introduction hole 313a is formed. The battery 32 supplies power to the expansion valve 37, inverter 43, and control device 46 for operation. Note that the battery 32 may be placed inside the casing 31.

As shown in FIG. 4, the first partition member 33 is a plate member that partitions a heat absorption chamber 31x in which the evaporator 38 is arranged and a heat radiation chamber 31y in which the condenser 36 is arranged inside the casing 31.

The first partition member 33 may include a heat insulating material that prevents heat transfer between the heat absorption chamber 31x and the heat radiation chamber 31y. The second partition member 34 is a plate member for forming an air passage in the heat absorption chamber 31x.

The heat absorption chamber 31x is formed on the right side and above the heat radiation chamber 31y. The above-mentioned outside air introduction hole 313a and outside air discharge hole 315a open into the heat radiation chamber 31y. Furthermore, the inside air recovery hole 316a and the inside air supply hole 316b open into the heat absorption chamber 31x.

The compressor 35 is arranged within the casing 31 in a machine room 31z that is different from the heat absorption chamber 31x and the heat radiation chamber 31y. The first partition member 33 and the second partition member 34 also partition the machine room 31z, the heat absorption room 31x, and the heat radiation room 31y. The outside air introduction hole 313a opens to the machine room 31z. The compressor 35 is a fluid machine that compresses and discharges refrigerant, and is operated by alternating current supplied from the inverter 43.

The capacitor 36 is arranged in the heat radiation chamber 31y. The condenser 36 is a heat exchanger that exchanges heat between the high-temperature, high-pressure refrigerant discharged from the compressor 35 and the air in the heat radiation chamber 31y. The condenser 36 corresponds to a heat radiation section that causes the refrigerant that has absorbed heat from the air in the evaporator 38 to radiate heat to the air in the heat radiation chamber 31y.

The expansion valve 37 is arranged in the machine room 31z. The expansion valve 37 decompresses and expands the refrigerant that has passed through the condenser 36 by narrowing the refrigerant passage. The expansion valve 37 is an electric expansion valve operated by electric power supplied from the battery 32.

The evaporator 38 is arranged in the heat absorption chamber 31x. In other words, the evaporator 38 is arranged above the capacitor 36. The evaporator 38 is a heat exchanger that exchanges heat between the refrigerant expanded under reduced pressure by the expansion valve 37 and the air in the endothermic chamber 31x. The evaporator 38 corresponds to a cooling unit that cools the air in the endothermic chamber 31x by exchanging heat between the air in the endothermic chamber 31x and the refrigerant.

The exhaust fan 39 is arranged in the outside air exhaust hole 315a in the heat absorption chamber 31x. The exhaust fan 39 introduces the air outside the casing 31 (hereinafter also referred to as outside air) into the heat radiation chamber 31y inside the casing 31, and the introduced outside air through the condenser 36 and the outside air exhaust hole 315a to the cold storage box. 2 and the outside of the cooling device 3.

The blowing fan 40 is arranged in the heat absorption chamber 31x to face the inside air supply hole 316b. The blow-off fan 40 introduces the air inside the cold box 2 (hereinafter also referred to as inside air) into the heat absorption chamber 31x inside the casing 31, and also introduces the air inside the cold box 2 into the heat absorption chamber 31x inside the casing 31, and also through the evaporator 38, the inside air supply hole 316b, and the supply duct 318. It blows out into the cooling chamber 2x of the cold storage box 2.

The compressor 35, condenser 36, expansion valve 37, and evaporator 38 constitute a vapor compression type refrigeration cycle, and are connected to each other by piping P shown in FIGS. 2 and 3.

The drain pan 41 is a funnel-shaped member that penetrates the first partition member 33 from the heat absorption chamber 31x to the heat radiation chamber 31y. The drain pan 41 is disposed below the evaporator 38 in the heat absorption chamber 31x, and has a shape that receives condensed water generated and dripped by the evaporator 38 and guides the received condensed water to the heat radiation chamber 31y. Further, the drain pan 41 is disposed above the evaporating dish 42 in the heat radiating chamber 31y, and has a shape that allows the condensed water introduced into the heat radiating chamber 31y to drip onto the evaporating dish 42.

The evaporating dish 42 is arranged below the condenser 36 and the drain pan 41 in the heat radiation chamber 31y. The evaporating dish 42 is shaped to receive condensed water dripping from the drain pan 41 and guide the received condensed water below the condenser 36 .

Therefore, the condensed water dropped onto the evaporating dish 42 is evaporated by the heat of the refrigerant passing through the condenser 36. As a result, the temperature of the condenser 36 also decreases, which in turn increases the cooling effect of the cooling chamber 2x.

The inverter 43 receives power from the battery 32 and controls the rotation speed and other operations of the compressor 35 by supplying alternating current to the compressor 35 in accordance with commands from the control device 46 . The control device 46 of the cooling device 3 will be described later.

The cold box 2 is a box that accommodates the object T to be kept cold. The cold storage object T may be anything such as food, medicine, etc., as long as it is meaningful to be cooled. As shown in FIGS. 1, 5, and 6, the cold box 2 is a substantially rectangular parallelepiped box.

The cold box 2 is a horizontally elongated box whose length in the vertical direction DR1 is approximately the same as that of the cooling device 3, and which is shorter than the length in the front-rear direction DR2 and the length in the left-right direction DR3. .

The cold box 2 is composed of a flexible soft case. The cold box 2 has higher flexibility than the casing 31 of the cooling device 3. As shown in FIG. 7, the cold box 2 is composed of a heat insulating material 2y covered with a flexible sheet material 2z. The heat insulating material 2y is made of a lightweight material such as urethane foam or styrene foam. The sheet material 2z is made of a lightweight material such as an aluminum vapor-deposited sheet, for example. When the cold storage box 2 is configured with a soft case, the cold storage capacity is inferior to that of a hard case, but it has the advantage of being able to be made compact by folding it after use.

The cold box 2 surrounds the cooling chamber 2x. The cooling chamber 2x is inside the cold storage box 2. The cold box 2 is configured such that the cooling device 3 can be attached to and detached from the side surface of the outer shell that faces the cooling device 3.

Specifically, the cold storage box 2 includes a main body 21 having an opening 210 for taking in and out the object T to be kept cold, and an opening/closing lid 22 that opens and closes the opening 210. The cold box 2 has an opening 210 formed in its upper surface, which is a portion that does not face the cooling device 3 . The cold box 2 of this embodiment has an opening 210 formed in its entire upper surface.

The main body section 21 has a front wall section 211, a rear wall section 212, a right wall section 213, a left wall section 214, and a lower wall section 215, and the entire upper surface thereof is open. A right wall portion 213 of the main body portion 21 faces the cooling device 3 . In this embodiment, the right wall portion 213 of the cold box 2 corresponds to the opposing wall portion facing the cooling device 3.

A recovery communication hole 213a and a supply communication hole 213b are formed in the right wall portion 213 of the main body portion 21 to communicate the cooling chamber 2x with the outside of the cold storage box 2. Air recovered from the cooling chamber 2x to the cooling device 3 passes through the recovery communication hole 213a. Air that is cooled in the cooling device 3 and then supplied from the cooling device 3 to the cooling chamber 2x passes through the supply communication hole 213b. The recovery communication hole 213a is arranged below the supply communication hole 213b.

In this embodiment, the recovery communication hole 213a and the supply communication hole 213b constitute a communication section through which the air recovered by the cooling device 3 and the air cooled by the cooling device 3 and then supplied into the refrigerator pass. ing.

The recovery communication hole 213a is formed in a portion of the right wall portion 213 facing the inside air recovery hole 316a of the cooling device 3 so as to communicate with the inside air recovery hole 316a when the cold box 2 is attached to the cooling device 3. has been done. The collection communication hole 213a is sized to have a tight fitting tolerance with the collection duct 317 so that the collection duct 317 can be press-fitted therein.

The supply communication hole 213b is formed in a portion of the right wall portion 213 facing the inside air supply hole 316b of the cooling device 3 so as to communicate with the inside air supply hole 316b when the cold box 2 is attached to the cooling device 3. has been done. The supply communication hole 213b is sized to have a tight fitting tolerance with the supply duct 318 so that the supply duct 318 can be press-fitted therein.

The opening/closing lid 22 has a size that can close the opening 210 of the main body 21. The opening/closing lid 22 is connected to the main body 21 so as to be rotatable about a predetermined location. Specifically, the opening/closing lid 22 is connected by a hinge or the like to the upper part of the right wall portion 213 to which the cooling device 3 is attached. Note that the opening/closing lid 22 may be configured separately from the main body portion 21.

Next, the control device 46, which is the electronic control section of the cooling device 3, will be explained. The control device 46 is a microcomputer including a CPU, RAM, ROM, flash memory, etc. (not shown). RAM, ROM, and flash memory are all non-transient physical storage media. A CPU executes a program stored in a ROM or flash memory, using RAM as a work area. By executing such a program by the CPU, various operations of the control device 46 are realized.

As shown in FIG. 8, on the input side of the control device 46, an operation section 48 having an internal temperature sensor 47 for detecting the internal temperature of the cold storage box 2, an operation switch for turning on/off the operation of the cooling device 3, etc. An outside temperature sensor, etc. (not shown) is connected. The internal temperature sensor 47 detects the temperature of the air collected from the cooling chamber 2x as the internal temperature.

The internal temperature sensor 47 and the operation unit 48 are attached to the cooling device 3 instead of the cold storage box 2. Specifically, the internal temperature sensor 47 is attached to the inside of a recovery duct 317 through which air collected from the inside of the refrigerator passes. Further, the operating unit 48 is attached to a portion of the casing 31 that is exposed to the outside so that it can be operated with the cooling device 3 attached to the cold box 2.

In the cooling system 1 of this embodiment, an electrical system including a control device 46, a power source, sensors, etc. is integrated into the cooling device 3 and is not provided in the cold box 2. Therefore, in the cooling system 1, there is no need to make an electrical connection when the cooling device 3 is attached or removed from the cold box 2, or to take measures to ensure electrical insulation in the cold box 2.

The control device 46 controls the operation of an expansion valve 37, an exhaust fan 39, a blow-off fan 40, an inverter 43, etc. connected to the output side of the cooling device 3 in response to signals from an internal temperature sensor 47, an operation unit 48, etc. Control.

Next, the operation of the cooling system 1 during cool-down will be explained. Cool down is an operation mode in which the temperature inside the cold storage box 2 is lowered by the air cooled by the evaporator 38.

The cooling system 1 starts cooling down, for example, when the operation switch of the operation unit 48 is turned on with the opening 210 of the main body 21 closed by the opening/closing lid 22. During cool-down, the cooling device 3 is controlled by the control device 46 so that cold air is supplied to the inside of the cold box 2. For example, the control device 46 controls the operations of the expansion valve 37, the exhaust fan 39, the blowing fan 40, and the inverter 43 of the cooling device 3 so that cold air at a desired temperature is blown inside the cold box 2.

The compressor 35 compresses the refrigerant flowing out from the evaporator 38 and discharges it to the condenser 36 side. The high-temperature, high-pressure refrigerant discharged from the compressor 35 radiates heat to the outside air at the condenser 36 . That is, the condenser 36 performs heat exchange between the refrigerant discharged from the compressor 35 and the outside air, thereby releasing the heat of the refrigerant to the outside air and condensing the refrigerant.

Due to the action of the exhaust fan 39, the outside air enters the machine room 31z in the casing 31 through the outside air introduction hole 313a as shown by the arrow in FIG. The outside air that has entered the machine room 31z passes through the compressor 35. The outside air that has passed through the compressor 35 enters the heat radiation chamber 31y from the machine room 31z, and passes through the condenser 36. The outside air that has passed through the condenser 36 is sucked in by the blowing fan 40 and is discharged to the outside of the casing 31 through the outside air exhaust hole 315a.

The refrigerant that has passed through the condenser 36 flows into the expansion valve 37. The expansion valve 37 reduces the pressure of the refrigerant condensed in the condenser 36. The refrigerant whose pressure has been reduced by the expansion valve 37 flows into the evaporator 38 and is evaporated by heat exchange with the inside air. At this time, the inside air is cooled by the latent heat of vaporization of the refrigerant.

Due to the action of the blow-off fan 40, the inside air enters the heat absorption chamber 31x from the cooling chamber 2x through the recovery communication hole 213a and the inside air recovery hole 316a, as shown by the arrow in FIG. The inside air that has entered the endothermic chamber 31x rises through the endothermic chamber 31x, passes through the evaporator 38, is then sucked in by the blowing fan 40, passes through the inside air supply hole 316b and the supply communication hole 213b, and is cooled from the endothermic chamber 31x. Blows out into room 2x. The air that has entered the cooling chamber 2x cools the cold storage target T while descending in the cooling chamber 2x as shown by the arrow in FIG.

Here, as shown in FIG. 10, the cooling capacity QI of the cooling device 3 during cool-down is larger when the blowing capacity of the blowing fan 40 is high compared to when the blowing capacity of the blowing fan 40 is low. . Moreover, the refrigerating capacity QI becomes smaller as the temperature inside the refrigerator becomes lower. That is, the refrigerating capacity QI decreases as the internal temperature approaches the target temperature. Note that the cooling capacity QI of the cooling device 3 is the amount of heat absorbed per unit time in the evaporator 38. Refrigeration capacity QI increases as the temperature difference between the air before and after the evaporator 38 increases, and decreases as the temperature difference between the air before and after the evaporator 38 decreases. Furthermore, the refrigerating capacity QI increases as the flow rate of air passing through the evaporator 38 increases, and decreases as the flow rate of air passing through the evaporator 38 decreases.

On the other hand, if the blowing capacity of the blowing fan 40 is high during cool-down, there is a trade-off in that the air in the cooling chamber 2x of the cold storage box 2 tends to leak to the outside through the gap between the opening 210 and the opening/closing lid 22.

In particular, if the air in the cooling chamber 2x leaks to the outside in a state where the difference between the outside temperature and the inside temperature is large, the heat loss QL due to ventilation will become excessive. As shown in FIG. 11, this heat loss QL is larger when the blowing capacity of the blowing fan 40 is high than when the blowing capacity of the blowing fan 40 is low. Moreover, the heat loss QL increases as the temperature inside the refrigerator decreases. Note that the inside/outside temperature difference is a subtracted value obtained by subtracting the inside temperature from the outside temperature.

Therefore, during cool-down, even if the blowing capacity of the blowing fan 40 is increased to increase the cooling capacity QI of the cooling device 3, the heat loss QL in the cold storage box 2 increases, and the temperature inside the refrigerator is maintained as intended. may not decrease. On the contrary, as shown in FIG. 12, for example, when the internal temperature approaches the target temperature, a higher effective refrigerating capacity QR is achieved by lowering the blowing capacity than when the blowing capacity of the blowing fan 40 is high. Sometimes. Note that the effective refrigerating capacity QR is obtained by subtracting the heat loss QL due to air leakage from the cold storage box 2 from the refrigerating capacity QI of the cooling device 3 (QR=QI-QL).

Taking these into account, the control device 46 executes fan control processing to control the blow-off fan 40 so that the optimum effective refrigerating capacity QR is exhibited. The fan control process will be explained with reference to the flowchart in FIG. 13. The control routine shown in FIG. 13 is executed by the control device 46 periodically or irregularly.

As shown in FIG. 13, the control device 46 reads various signals such as a detection signal from the internal temperature sensor 47 and an operation signal from the operation unit 48 in step S100. Then, in step S110, the control device 46 determines whether or not it is time to cool down the temperature inside the cold storage box 2. In this determination process, for example, if the operation switch of the operation unit 48 is turned on, it is determined that the cool-down period is in progress, and if the operation switch is turned off, it is determined that the cool-down period is not in progress.

If the result of the determination process in step S110 is that it is time to cool down, the control device 46 moves to step S120. On the other hand, if it is not the cool-down time, the control device 46 moves to step S130 and stops the blowing fan 40.

In step S120, the control device 46 adjusts the blowing capacity of the blowing fan 40 according to the internal temperature of the cold storage box 2. Specifically, the control device 46 maintains the blowing capacity of the blowing fan 40 at the maximum when the internal temperature of the cold storage box 2 is higher than a predetermined reference temperature Th1, and when it becomes lower than the reference temperature Th1, the control device 46 maintains the blowing capacity of the blowing fan 40 to the maximum. Reduces air blowing capacity.

The reference temperature Th1 is set to be lower than the outside air temperature and higher than the target temperature of the cold box 2. The reference temperature Th1 of the present embodiment is set to an internal temperature at which it is assumed that a higher effective refrigerating capacity QR is exhibited when the air blowing capacity is lowered than when the air blowing capacity of the blowing fan 40 is maintained. Ru.

Here, in the present disclosure, as shown in FIG. 12, a fan characteristic line that defines a change in the effective refrigerating capacity QR according to the internal temperature when the blowing capacity of the blowing fan 40 is set to a high capacity is defined as a high capacity line LH1. shall be. Further, in the present disclosure, a fan characteristic line that defines a change in the effective refrigerating capacity QR according to the internal temperature when the blowing capacity of the blowing fan 40 is set to a low capacity is referred to as a low capacity line LL1. Furthermore, in the present disclosure, the internal temperature at the intersection of the high capacity line LH1 and the low capacity line LL1 is defined as the intersection point temperature Tp.

During cool-down, it is assumed that a higher effective refrigerating capacity QR will be achieved if the blowing capacity of the blowing fan 40 is maintained until the internal temperature reaches the intersection point temperature Tp compared to when the blowing capacity of the blowing fan 40 is reduced. be done.

On the other hand, when the temperature inside the refrigerator becomes equal to or lower than the intersection point temperature Tp, it is assumed that a higher effective refrigerating capacity QR is exhibited by lowering the air blowing capacity than when the blowing capacity of the blowing fan 40 is maintained. Therefore, "the internal temperature at which it is assumed that a higher effective refrigerating capacity QR will be exhibited when the air blowing capacity is lowered than when the air blowing capacity of the blowing fan 40 is maintained" is the temperature below the intersection point temperature Tp. It is desirable to do so. Taking these into account, the reference temperature Th1 of this embodiment is set to the intersection temperature Tp.

Here, for example, if the opening/closing lid 22 of the cold box 2 is temporarily removed, the internal temperature of the cold box 2 may become higher than the reference temperature Th1. In this case, if the blowing capacity of the blow-off fan 40 is maintained in a low state, it becomes difficult for the temperature inside the refrigerator to fall as intended.

Therefore, when the internal temperature of the cold storage box 2 rises to a heating reference temperature Th2 (>Th1) higher than the reference temperature Th1, the control device 46 increases the blowing capacity of the blowing fan 40 to the maximum.

Here, the graph shown in FIG. 14 is an actual measurement result of the time change in the temperature inside the refrigerator during cool-down. In FIG. 14, the solid line indicates the time change in the temperature inside the refrigerator when the above-mentioned fan control process is executed, and the time change in the temperature inside the refrigerator when the conventional process for maintaining the blowing capacity of the blowing fan 40 at the maximum is executed. is shown by a dashed line.

As shown in FIG. 14, when the above-described fan control process is executed, when the temperature inside the refrigerator becomes lower than the reference temperature Th1, the temperature inside the refrigerator tends to decrease compared to when the conventional process is executed. The time it takes for the internal temperature to reach the target temperature is significantly shortened.

In the cooling system 1 described above, during cool-down, when the internal temperature becomes equal to or lower than the reference temperature Th1, which is set higher than the target temperature of the cold storage box 2, the blowing capacity of the blowing fan 40 decreases.

According to this, during cool-down, the blowing capacity of the blower fan 40 decreases before the temperature inside the cold storage box 2 reaches the target temperature, so cooling is performed in a state where there is a large temperature difference between the outside temperature and the inside temperature. Leakage of air in the chamber 2x to the outside is suppressed. Therefore, according to the cooling system 1 of the present disclosure, it is possible to reduce the temperature of the cooling chamber 2x while suppressing the heat loss QL due to air leakage from the inside of the cold storage box 2.

Specifically, the reference temperature Th1 is set to the internal temperature at which it is assumed that a higher effective refrigerating capacity QR is exhibited when the air blowing capacity is lowered than when the air blowing capacity of the blowing fan 40 is maintained. be done.

In this case, even if the internal temperature falls below the reference temperature Th1 and the blowing capacity of the blowing fan 40 is reduced, the effective refrigerating capacity QR at that time is higher than when the blowing capacity of the blowing fan 40 is maintained. Become. Therefore, it is possible to reduce the time required for the internal temperature to reach the target temperature while suppressing energy consumption during cool-down. In addition, the reduction in the blowing capacity of the blow-off fan 40 makes it difficult for highly humid air to flow into the refrigerator, so frost formation on the evaporator 38 is suppressed.

Here, in order to ensure portability (that is, mobility), the cold box 2 needs to be made of lightweight constituent materials, and it is not possible to use sealing material abundantly like in a stationary refrigerator or the like. Since this is difficult, there are many locations where air leaks in the cold box 2.

Specifically, the cooling device 3 is disposed outside the cold box 2 and is detachably attached to the cold box 2. The cold storage box 2 is formed with a communication section through which the air recovered by the cooling device 3 and the air cooled by the cooling device 3 and then supplied into the refrigerator pass. During cool-down, there is a concern about gas leaking to the outside through the communication part, but the blowing capacity of the blowing fan 40 decreases before the internal temperature of the cold storage box 2 reaches the target temperature. air leakage is suppressed.

Furthermore, the cold box 2 is made up of a soft case having at least a portion of flexibility. In this way, when the cold storage box 2 is composed of a soft case, it is easily deformed and it is difficult to maintain airtightness inside the refrigerator. Since the air blowing capacity is reduced, leakage of air from inside the refrigerator to the outside is suppressed.

Here, the cold box 2 has a right wall portion 213 that faces the cooling device 3 and partitions the inside and outside of the cold box 2 . The right wall portion 213 has a recovery communication hole 213a through which air collected from the inside of the cold box 2 to the cooling device 3 passes, and a supply hole 213a through which air supplied from the cooling device 3 to the cold box 2 passes. A communication hole 213b is formed.

In this way, the inside and outside of the cold box 2 are partitioned by the right wall 213 facing the cooling device 3, so even if the cooling device 3 is removed from the cold box 2, the cold storage The gas inside the box 2 is difficult to leak to the outside of the cold box 2. Therefore, the cooling device 3 can be removed from the cold storage box 2 while suppressing the deterioration of the cold storage function of the cold storage box 2.

Note that the recovery communication hole 213a and the supply communication hole 213b after the cooling device 3 is removed from the cold box 2 can be easily closed after the cooling device 3 is removed. Further, even if the recovery communication hole 213a and the supply communication hole 213b are not blocked, the cold storage function of the cold storage box 2 after removing the cooling device 3 will decrease due to the presence of the right wall portion 213 itself, compared to the conventional case. is also reduced.

Further, the evaporator 38 and the capacitor 36 are arranged in the vertical direction DR1. In this way, when the evaporator 38 and the capacitor 36 are lined up in the vertical direction DR1, the casing 31 can be made thinner in the front-rear direction DR2 or the left-right direction DR3 than when the evaporator 38 and the capacitor 36 are lined up in the vertical direction DR1. can.

In addition, the evaporator 38 is located above the capacitor 36. With this configuration, the cold air in the evaporator 38 falls and cools the condenser 36, thereby improving the ability of the cooling device 3 to cool the inside air.

Moreover, in the casing 31, as shown in FIG. 1, the surface where the outside air introduction hole 313a is formed and the surface where the outside air discharge hole 315a is formed are oriented in different directions. With this configuration, a phenomenon in which high-temperature outside air discharged from the outside air exhaust hole 315a is immediately introduced into the inside of the casing 31 from the outside air introduction hole 313a, that is, a short circuit is less likely to occur.

Further, during operation of the cooling device 3, outside air introduced into the casing 31 from the outside air introduction hole 313a passes through the compressor 35 and then the condenser 36, and then passes through the outside air exhaust hole 315a into the casing 31 without passing through the compressor 35. is discharged outside. In this way, the outside air passing through the compressor 35 is the outside air before being heated through the condenser 36, so that the influence of the heated outside air on the compressor 35 can be suppressed.

(Modified example of the first embodiment)
In the first embodiment, an example has been described in which the reference temperature Th1 is set to the intersection temperature Tp in the fan control process, but the reference temperature Th1 may be set to a temperature lower than the intersection temperature Tp. Further, the reference temperature Th1 is desirably set to a temperature equal to or lower than the intersection temperature Tp, but is not limited to this, and is set to a temperature higher than the intersection temperature Tp (for example, a temperature closer to the target temperature than the outside temperature). May be set. Moreover, the control device 46 may control the blow-off fan 40 so that the blowing capacity of the blow-off fan 40 decreases stepwise or continuously as the temperature inside the refrigerator approaches the target temperature.

In the first embodiment, in the fan control process, the blowing capacity of the blowing fan 40 is switched to two stages, but the blowing capacity may be switched to three or more stages. In this case, a fan characteristic line is created that defines the change in effective refrigerating capacity QR according to the internal temperature at each air blowing capacity, and by referring to this fan characteristic line, the air blowing capacity that can exhibit the optimum effective refrigerating capacity QR is created. All you have to do is switch to .

In the first embodiment, an example has been described in which the reference temperature Th1 and the temperature increase reference temperature Th2 are set to different temperatures, but the reference temperature Th1 and the temperature increase reference temperature Th2 may be set to the same temperature. .

(Second embodiment)
Next, a second embodiment will be described with reference to FIGS. 15 to 18. In this embodiment, parts that are different from the first embodiment will be mainly explained.

As shown in FIG. 15, the cooling capacity QI of the cooling device 3 during cool-down is larger when the blowing capacity of the blowing fan 40 is high than when the blowing capacity of the blowing fan 40 is low. Moreover, the refrigerating capacity QI decreases as the difference between the outside temperature and the inside temperature of the refrigerator increases. That is, the refrigerating capacity QI decreases as the internal temperature approaches the target temperature.

On the other hand, as shown in FIG. 16, the heat loss QL increases as the difference between the outside temperature and the inside temperature of the refrigerator increases. That is, the heat loss QL increases as the internal temperature approaches the target temperature.

For this reason, for example, as shown in FIG. 17, when the temperature inside the refrigerator approaches the target temperature and the temperature difference between the outside temperature and the temperature inside the refrigerator increases, the air blowing capacity of the blowing fan 40 is higher than when the blowing capacity of the blower fan 40 is high. A higher effective refrigerating capacity QR may be achieved by lowering the capacity.

Taking these into account, the control device 46 executes fan control processing to control the blow-off fan 40 so that the optimum effective refrigerating capacity QR is exhibited. The fan control process will be explained with reference to the flowchart in FIG. 18. The control routine shown in FIG. 18 is executed by the control device 46 periodically or irregularly.

As shown in FIG. 18, the control device 46 reads various signals such as a detection signal from the internal temperature sensor 47 and an operation signal from the operation unit 48 in step S200. Then, in step S210, the control device 46 determines whether or not it is time to cool down the temperature inside the cold storage box 2. This determination process is similar to the determination process in step S110 of the first embodiment.

If the result of the determination process in step S210 is that it is time to cool down, the control device 46 moves to step S220. On the other hand, if it is not the cool-down time, the control device 46 moves to step S230 and stops the blow-off fan 40.

In step S220, the control device 46 adjusts the blowing capacity of the blowing fan 40 according to the internal temperature of the cold storage box 2. Specifically, the control device 46 maintains the blowing capacity of the blowing fan 40 at the maximum when the temperature difference between the outside temperature and the inside temperature is smaller than a predetermined reference value ΔTh1, and when it exceeds the reference value ΔTh1, The blowing capacity of the blowing fan 40 is reduced.

The reference value ΔTh1 is set to a value smaller than the temperature difference between the outside temperature and the target temperature. The reference value ΔTh1 in this embodiment is set to the temperature difference between the inside and outside where it is assumed that a higher effective refrigerating capacity QR will be exhibited when the blowing capacity of the blowing fan 40 is lowered compared to when the blowing capacity of the blowing fan 40 is maintained. Ru.

Here, in the present disclosure, as shown in FIG. 17, a fan characteristic line that defines a change in the effective refrigerating capacity QR according to the difference in temperature between the inside and outside when the blowing capacity of the blowing fan 40 is set to a high capacity is defined as a high capacity line LH2. shall be. Further, in the present disclosure, a fan characteristic line that defines a change in the effective refrigerating capacity QR according to the difference in temperature between the inside and outside when the blowing capacity of the blowing fan 40 is set to a low capacity is referred to as a low capacity line LL2. Furthermore, in the present disclosure, the temperature difference between the inside and outside at the intersection of the high capacity line LH2 and the low capacity line LL2 is defined as the intersection point temperature difference ΔTp.

During cool-down, a higher effective refrigerating capacity QR is achieved by maintaining the air blowing capacity of the blower fan 40 than when the blowing capacity of the blowing fan 40 is reduced until the temperature difference between the inside and outside reaches the intersection point temperature difference ΔTp. is assumed.

On the other hand, when the temperature difference between the inside and outside becomes equal to or greater than the intersection point temperature difference ΔTp, it is assumed that a higher effective refrigerating capacity QR is exhibited by lowering the air blowing capacity than when the blowing capacity of the blowing fan 40 is maintained. Therefore, "the temperature difference between the inside and outside where it is assumed that a higher effective refrigerating capacity QR will be achieved by reducing the blowing capacity of the blowing fan 40 compared to when the blowing capacity is maintained" is equal to or larger than the intersection point temperature difference ΔTp. It is desirable that the temperature be the same. Taking these into account, the reference value ΔTh1 of this embodiment is set to the intersection point temperature difference ΔTp.

Here, for example, if the opening/closing lid 22 of the cold box 2 is temporarily removed, the temperature difference between the inside and outside may become smaller than the reference value ΔTh1. In this case, if the blowing capacity of the blow-off fan 40 is maintained in a low state, it becomes difficult for the temperature inside the refrigerator to fall as intended.

Therefore, when the temperature difference between the inside and outside is reduced to a temperature increase reference value ΔTh2 (<ΔTh1) lower than the reference value ΔTh1, the control device 46 increases the blowing capacity of the blowing fan 40 to the maximum.

Other configurations are similar to those of the first embodiment. The cooling system 1 of this embodiment can obtain the same effects as the first embodiment from the same configuration or equivalent configuration as the first embodiment.

The cooling system 1 of this embodiment has a reference value ΔTh1 at which the temperature difference between the inside and outside temperature of the refrigerator is set to a value smaller than the temperature difference between the target temperature of the cold storage box 2 and the outside air temperature during cool down. If it becomes more than that, the blowing capacity of the blowing fan 40 will be reduced.

According to this, during cool-down, the blowing capacity of the blower fan 40 decreases before the temperature inside the cold storage box 2 reaches the target temperature, so cooling is performed in a state where there is a large temperature difference between the outside temperature and the inside temperature. Leakage of air in the chamber 2x to the outside is suppressed. Therefore, according to the cooling system 1 of the present disclosure, it is possible to reduce the temperature of the cooling chamber 2x while suppressing the heat loss QL due to air leakage from the inside of the cold storage box 2.

Specifically, the reference value ΔTh1 is set to the temperature difference between the inside and outside where it is assumed that a higher effective refrigerating capacity QR will be exhibited when the blowing capacity of the blowing fan 40 is reduced compared to when the blowing capacity of the blowing fan 40 is maintained. be done.

In this case, even if the temperature difference between the inside and outside exceeds the reference value ΔTh1 and the blowing capacity of the blowing fan 40 is reduced, the effective refrigerating capacity QR at that time is higher than when the blowing capacity of the blowing fan 40 is maintained. Become. Therefore, it is possible to reduce the time required for the internal temperature to reach the target temperature while suppressing energy consumption during cool-down. In addition, the reduction in the blowing capacity of the blow-off fan 40 makes it difficult for highly humid air to flow into the refrigerator, so frost formation on the evaporator 38 is suppressed.

(Modified example of second embodiment)
In the second embodiment, an example has been described in which the reference value ΔTh1 is set to the intersection temperature difference ΔTp in the fan control process, but the reference value ΔTh1 may be set to a value larger than the intersection temperature difference ΔTp. Further, the reference value ΔTh1 is desirably set to a value greater than or equal to the intersection temperature difference ΔTp, but is not limited to this, and may be set to a value smaller than the intersection temperature difference ΔTp. Further, the control device 46 may control the blowing fan 40 so that the blowing ability of the blowing fan 40 decreases stepwise or continuously as the difference between the inside and outside temperatures increases.

In the second embodiment, in the fan control process, the blowing capacity of the blowing fan 40 is switched to two stages, but the blowing capacity may be switched to three or more stages. In this case, a fan characteristic line is created that defines the change in effective refrigerating capacity QR according to the temperature difference between the inside and outside at each blowing capacity, and by referring to this fan characteristic line, the blowing capacity that can exhibit the optimum effective refrigerating capacity QR is created. All you have to do is switch to .

In the second embodiment, an example has been described in which the reference value ΔTh1 and the temperature increase reference value ΔTh2 are set to different values, but the reference value ΔTh1 and the temperature increase reference value ΔTh2 may be set to the same value. .

(Other embodiments)
Although typical embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and can be modified in various ways, for example, as described below.

In the above embodiment, the internal temperature sensor 47 is attached to the cooling device 3, but the invention is not limited to this, and the internal temperature sensor 47 may be attached to the cold storage box 2, for example. .

In the above embodiment, the cooling device 3 is arranged outside the cold box 2, but the cooling system 1 is not limited to this. The cooling system 1 may be placed inside the cold box 2, for example.

In the above embodiment, the cold box 2 is configured as a soft case, but the cold box 2 is not limited to this. For example, at least a portion of the cold box 2 may be configured with a hard case.

In the above-described embodiment, the cold box 2 is exemplified so that the cooling device 3 can be attached to and removed from the side wall of the cold box 2, but the present invention is not limited to this. The cold box 2 may be configured such that the cooling device 3 can be attached to and detached from the upper wall, for example. In this case, the cold box 2 may be provided with the opening 210 in a portion of the upper wall that does not face the cooling device 3 or in a side wall.

In the above-described embodiment, the communication section that communicates the cooling chamber 2x with the outside of the cold storage box 2 is configured by two holes, such as the recovery communication hole 213a and the supply communication hole 213b, but the communication section is not limited to this. The communication portion may be configured by, for example, a single hole or three or more holes facing each of the inside air recovery hole 316a and the inside air supply hole 316b. When the cooling device 3 is attached to the cold storage box 2, the single hole or three or more holes that constitute the communication section are cooled between the part communicating with the inside air recovery hole 316a and the part communicating with the inside air supply hole 316b. It is closed by the left side part 316 of the device 3. Therefore, even if the communicating portion is configured by a single hole or three or more holes, a configuration that functions substantially in the same manner as the embodiment described above can be obtained.

In the above-described embodiment, the inside air flowing inside the cold box 2 and the cooling device 3 is air in the above-described embodiment, but it may be a gas other than air. Furthermore, the outside air flowing inside the cold box 2 and outside the cooling system 1 may be a gas other than air.

In the embodiment described above, the outside air introduction hole 313a and the outside air exhaust hole 315a are each formed on the side surface of the casing 31, but this does not necessarily have to be the case. For example, the outside air introduction hole 313a may be formed in the right side part 315, and the outside air discharge hole 315a may be formed in the front side part 313. Further, for example, both the outside air introduction hole 313a and the outside air discharge hole 315a may be formed in the right side portion 315 of the casing 31. Further, for example, the position of the outside air introduction hole 313a and the position of the outside air discharge hole 315a may be reversed from those in the above embodiment.

In the embodiment described above, the user can detachably attach the cooling device 3 to the cold storage box 2 by press-fitting the recovery duct 317 and the supply duct 318 into the recovery communication hole 213a and the supply communication hole 213b, respectively. ing. However, the removable attachment of the cooling device 3 to the cold box 2 is not limited to such a press-fitting method, and may be realized by other methods. The detachable attachment of the cooling device 3 to the cold box 2 may be realized by, for example, fastening the cold box 2 and the cooling device 3 with a belt, or may be realized by a hook-and-loop fastener.

In the embodiment described above, the condenser 36 is arranged below the evaporator 38 in the cooling device 3 . However, the arrangement of the capacitor 36 and the evaporator 38 does not necessarily have to be like this. For example, the capacitor 36 may be placed above the evaporator 38. In this case, a duct arranged inside the casing 31 may guide the inside air cooled by the evaporator 38 to the inside air supply hole 316b. Note that the capacitor 36 and the evaporator 38 may be arranged to overlap in a direction perpendicular to the vertical direction DR1.

In the embodiment described above, the condenser unit consisting of the condenser 36 and the exhaust fan 39 and the evaporator unit consisting of the evaporator 38 and the blowing fan 40 are housed in the same casing 31. However, the condenser unit and the evaporator unit may also be housed in different casings.

In the embodiments described above, the exhaust fan 39 is of the suction type located downstream of the airflow of the condenser 36 . However, the exhaust fan 39 may be a push-in type disposed upstream of the condenser 36 in the air flow. This also applies to the blowing fan 40.

In the embodiment described above, the outside air enters the outside air introduction hole 313a, passes through the compressor 35 and the condenser 36 in this order, and exits the casing 31 from the outside air exhaust hole 315a. However, after the outside air enters the outside air introduction hole 313a, it may pass through the battery 32, the compressor 35, and the capacitor 36 in this order, and then exit from the casing 31 through the outside air exhaust hole 315a.

The battery 32 may be removed from the cooling device 3. In that case, the cooling device 3 may receive power from an external power source (for example, a system power source).

In the embodiment described above, the condenser 36 is shown as an example of the heat dissipation part, and the evaporator 38 is shown as an example of the cooling part. However, the heat dissipation section and the cooling section may be other than the combination of the condenser 36 and the evaporator 38. For example, the heat dissipation section and the cooling section may be a heat dissipation section in a water circuit.

In the embodiments described above, a small mobile type cooling system is disclosed as an example of the cooling system 1. However, the cooling system 1 does not need to be mobile or small.

In the embodiments described above, it goes without saying that the elements constituting the embodiments are not necessarily essential, except in cases where it is specifically specified that they are essential, or where they are clearly considered essential in principle.

In the embodiments described above, when numerical values such as the number, numerical value, amount, range, etc. of the constituent elements of the embodiment are mentioned, it is especially specified that it is essential, or it is clearly limited to a specific number in principle. It is not limited to that specific number, except in certain cases.

In the above-described embodiments, when referring to the shape, positional relationship, etc. of components, etc., we refer to the shape, positional relationship, etc., unless explicitly stated or in principle limited to a specific shape, positional relationship, etc. etc., but not limited to.

In the embodiment described above, if it is described that external environment information (for example, outside temperature) is acquired from a sensor, it is also possible to dispose of that sensor and receive that external environment information from an external server or cloud. . Alternatively, it is also possible to eliminate the sensor, acquire relevant information related to the external environment information from an external server or cloud, and estimate the external environment information from the acquired relevant information.

(summary)
According to the first aspect shown in part or all of the above-described embodiments, the cooling system includes a cold box, a cooling unit that cools gas, and blows out the gas after being cooled by the cooling unit into the refrigerator. A cooling device including a blow-off fan and a control device for controlling the blow-off fan. During cool-down, the control device reduces the blowing capacity of the blow-off fan when the temperature inside the refrigerator falls below a reference temperature that is set higher than the target temperature of the cold box.

According to the second viewpoint, the reference temperature is set to the internal temperature at which it is assumed that a higher effective refrigerating capacity is exhibited when the air blowing capacity is lowered than when the air blowing capacity is maintained. Note that the effective refrigerating capacity is obtained by subtracting the loss of heat due to gas leakage from the cold box from the refrigerating capacity of the cooling device.

In this case, even if the temperature inside the refrigerator falls below the reference temperature and the blowing capacity of the blowing fan is reduced, the effective refrigerating capacity at that time will be higher than when the blowing capacity of the blowing fan is maintained. Therefore, it is possible to reduce the time required for the internal temperature to reach the target temperature while suppressing energy consumption during cool-down. In addition, the reduction in the blowing capacity of the blowing fan makes it difficult for highly humid air to flow into the refrigerator, thereby suppressing frost formation in the cooling section.

According to the third aspect, the cooling system includes a cold box, a cooling unit that cools the gas, a blowout fan that blows out the gas cooled in the cooling unit into the refrigerator, and a control device that controls the blowout fan. A device. During cool-down, when the temperature difference between the inside and outside of the refrigerator exceeds a reference value that is set to a value smaller than the temperature difference between the target temperature of the cold storage box and the outside temperature, the control device turns on the blow-off fan. Reduces air blowing capacity.

According to the fourth aspect, the reference value is set to the temperature difference between the inside and outside where it is assumed that a higher effective refrigerating capacity is exhibited when the air blowing capacity is lowered than when the air blowing capacity is maintained. Note that the effective refrigerating capacity is obtained by subtracting the loss of heat due to gas leakage from the cold box from the refrigerating capacity of the cooling device.

According to this, even if the temperature difference between the inside and outside exceeds a reference value and the blowing capacity of the blowing fan is reduced, the effective refrigerating capacity at that time will be higher than when the blowing capacity of the blowing fan is maintained. This makes it possible to reduce energy consumption during cool-down and shorten the time it takes for the internal temperature to reach the target temperature. In addition, the reduction in the blowing capacity of the blowing fan makes it difficult for highly humid air to flow into the refrigerator, thereby suppressing frost formation in the cooling section.

According to the fifth aspect, the cooling device is disposed outside the cold box and is detachably attached to the cold box. The cold box is formed with a communication section through which gas recovered by the cooling device and gas cooled by the cooling device and supplied into the refrigerator pass.

During cool-down, there is a concern that gas may leak to the outside not only through the gap between the opening and the opening/closing lid, but also through the communication part. Since the capacity is reduced, leakage of gas from inside the refrigerator to the outside is suppressed.

According to the sixth aspect, the cold box is composed of a soft case that is at least partially flexible. If the cold storage box is made of a soft case, it will easily deform and it will be difficult to maintain airtightness inside the refrigerator. As the temperature decreases, leakage of gas from the inside of the refrigerator to the outside is suppressed.

1 Cooling system 2 Cold box 210 Opening 22 Opening/closing lid 3 Cooling device 38 Evaporator (cooling section)
40 Blow-off fan 46 Control device

Claims (5)

A cooling system,
a cold storage box (2) that houses a cold storage object and has an opening (210) for taking in and taking out the cold storage object and an opening/closing lid (22) that opens and closes the opening;
A cooling unit (38) that cools the gas collected from the inside of the cold storage box, a blow-off fan (40) that blows out the gas cooled by the cooling unit into the inside of the cold storage, and a control device that controls the blow-off fan. (46); a cooling device (3);
The control device is configured to set the internal temperature of the cold storage box to a temperature higher than a target temperature of the cold storage box during a cool-down period in which the internal temperature of the cold storage box is lowered by the gas cooled by the cooling unit. When the temperature drops below the reference temperature, the blowing capacity of the blowing fan is reduced,
When the effective refrigerating capacity is calculated by removing the heat loss due to the leakage of the gas from the cold storage box from the refrigerating capacity of the cooling device,
The reference temperature is set to the internal temperature at which it is assumed that the effective refrigerating capacity is higher when the air blowing capacity is lowered than when the air blowing capacity is maintained. A cooling system,
a cold storage box (2) that houses a cold storage object and has an opening (210) for taking in and taking out the cold storage object and an opening/closing lid (22) that opens and closes the opening;
A cooling unit (38) that cools the gas collected from the inside of the cold storage box, a blow-off fan (40) that blows out the gas cooled by the cooling unit into the inside of the cold storage, and a control device that controls the blow-off fan. (46); a cooling device (3);
The control device is configured such that during a cool-down period in which the internal temperature of the cold storage box is lowered by the gas cooled by the cooling unit, the temperature difference between the inside and outside of the storage box and the outside temperature is set to a target value of the cold storage box. A cooling system that reduces the air blowing capacity of the blowing fan when the temperature exceeds a reference value that is set to a value smaller than a temperature difference between the outside air temperature and the outside air temperature. When the effective refrigerating capacity is calculated by removing the heat loss due to the leakage of the gas from the cold storage box from the refrigerating capacity of the cooling device,
According to claim 2 , the reference value is set to the temperature difference between the inside and outside where it is assumed that the effective refrigerating capacity is higher when the air blowing capacity is lowered than when the air blowing capacity is maintained. Cooling system as described. The cooling device is disposed outside the cold box and is detachably attached to the cold box,
Any one of claims 1 to 3 , wherein the cold storage box is formed with a communication section through which the gas recovered by the cooling device and the gas supplied into the refrigerator after being cooled by the cooling device pass. The cooling system according to any one of the above. The cooling system according to any one of claims 1 to 4 , wherein the cold box is at least partially composed of a soft case having flexibility.

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