JP3103603B2 - Cool storage type cool box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative cold storage system which uses a regenerator to keep the inside of the refrigerator cool, and which is used for transporting fresh foods, pharmaceuticals, and other goods requiring refrigeration or freezing.

[0002]

2. Description of the Related Art As a cold storage type cold storage, Japanese Patent Laid-Open No. 1-234 is disclosed.
As disclosed in Japanese Patent Publication No. 778, a small regenerative cold storage has been used for delivery of trucks and the like in distribution of fresh food.

[0003] An example of the above-mentioned conventional cold storage type cold storage will be described below with reference to the drawings.

FIG. 5 is a longitudinal sectional view showing the structure of a conventional cold storage type cool box, and FIG. 6 is an electric circuit diagram. 5 to 6
In FIG. 1, reference numeral 1 denotes a cool box main body, which is composed of a cabinet 2 having a built-in heat insulating material, a door 3, and a gasket 11 for sealing the door 3 and the cabinet 2. Reference numeral 10 denotes a caster attached to the bottom of the cool box main body 1. A cold storage room 12 has a cold storage room 13 below the cold storage room 12.
It consists of. A condensing unit 4 is attached to the lower surface of the bottom plate of the cool box main body 1. The condensing unit 4 has a compressor 7 in addition to a condenser 5 and a condenser fan motor 6. The compressor 7, the condenser 5, the capillary (not shown) and the refrigerant evaporating tube constitute a refrigerant circulation type cooling unit.

[0005] 14 is a commercial power supply, 15 is a main switch,
Reference numeral 16 denotes a cold storage sensing thermostat, 22 denotes a charger, 17 denotes a cool room temperature controller (thermostat), and 19 denotes a changeover switch for operating the blower 9. Reference numeral 20 denotes the charger 22 and the storage battery 2 only when the commercial power supply 14 is turned on.
The storage battery 21 is a power supply for operating the blower fan 9.

[0006] The operation of the cold storage type cold storage constructed as described above will be described with reference to Figs.

First, in the cold storage operation, when the commercial power supply 14 is turned on and the main switch 15 is turned on, the refrigerant circulation type cooling unit (including the compressor 7, the condenser 5 and the condenser fan motor 6) is operated by the cold storage type heat exchanger. 8 is operated via a cold storage sensing thermostat 16 for detecting cold storage, and the compressor 7 is repeatedly operated and stopped at a predetermined temperature to control the cold storage temperature of the cold storage heat exchanger 8 within a certain temperature range. I do.

The charger 22 and the relay 20 are operated by the commercial power supply 14, and the charger 22 is operated by the operation of the relay 20.
And the storage battery 21 is energized and charged. The storage battery 21
It is connected to the blower 9 via an in-compartment temperature controller 17 and a changeover switch 19 (cooled when closed, dedicated to cold storage when open or not cooled).

Next, in the cool keeping operation, after the cool storage type heat exchanger 8 completes the cool storage, the changeover switch 19 is turned on, and the inside of the cool keeping room 12 is controlled by the inside temperature controller 17 using the storage battery 21 as a power source. The blower 9 is turned on / off to control the temperature to an arbitrary set temperature. Then, after the cooled transported goods such as fresh foods and the like transported from the production area or the like are put into the cold storage room 12, the commercial power supply 14 is removed, and the operation of the compressor 7 is stopped.

Then, it is transported to a destination by placing it on a transport truck or the like. At this time, the cold storage room 12 contains the regenerative heat exchanger 8.
Is cooled by the cold storage chamber 13 which is cooled by the latent heat of fusion of the product, thereby preventing the temperature of the transported goods from rising.

[0011]

However, in the above configuration, the output of the blower for controlling the temperature in the refrigerator is designed to be an output amount capable of maintaining the interior of the refrigerator at an arbitrary temperature. It took a long time to lower the temperature from room temperature to an arbitrary set temperature. Also, even if the output of the blower is increased to reduce the time required for lowering the temperature in the refrigerator, the capacity of the storage battery serving as the power supply of the blower during transportation increases, which increases the cost and increases the cost of the main unit. There was a problem that installation was impossible.

The present invention solves the above-mentioned problems. When the temperature of the cool room is equal to or higher than an arbitrary temperature by the temperature detecting means at the start of the operation of the ventilation fan, all of the plurality of ventilation fans are operated by the ventilation fan control means, When the temperature of the cold storage room is lower than an arbitrary temperature, at least one
By stopping the ventilation fans, the internal temperature can be reduced from room temperature to an arbitrary set temperature in a short time. Further, when the temperature in the cold storage room is kept near an arbitrary set temperature, at least one ventilation fan is stopped, so that a rechargeable storage battery serving as a power supply of the ventilation fan may be a small-sized one to provide a cold storage type cold storage. It is.

[0013]

In order to solve the above-mentioned problems, a regenerative cold storage according to the present invention comprises a plurality of ventilation fans which are operated only when the temperature of the cold storage room is controlled, and a temperature for detecting the temperature of the cold storage room. Detecting means, and a ventilation fan control means for controlling the operation of the ventilation fan, wherein when the temperature of the cold room is equal to or higher than an arbitrary temperature by the temperature detection means at the start of the ventilation fan operation, the ventilation fan control means When all of the plurality of ventilation fans are operated and the temperature of the cold storage room is lower than an arbitrary temperature, at least one of the ventilation fans is stopped by the ventilation fan control means.

[0014]

According to the present invention, the internal temperature can be reduced from room temperature to an arbitrary set temperature in a short time by the above-mentioned structure. Furthermore, when the temperature in the cool room is kept near an arbitrary set temperature, at least one ventilation fan is stopped, so that the rechargeable storage battery used as a power source for the ventilation fan is small and requires little installation space. , The cost will be lower.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a cold storage type cold storage according to an embodiment of the present invention. FIG. 1 is a functional block diagram of a freezing mode, a cold mode, and a power supply switching mode of a ventilation fan of a cool storage type cold storage according to one embodiment of the present invention.

In FIG. 1, reference numeral 23 denotes a cool box main body, a cabinet 24 containing heat insulating material, a door 25, and a door 25.
And a gasket 26 for sealing the cabinet 24. Reference numeral 27 denotes a cold storage room, which is composed of a latent heat type cold storage agent 28 having a freezing point lower than the set temperature of the cold storage and a cooler 29 for cooling and solidifying the cold storage agent 28, and is formed at a lower portion of the cold storage main body 23. ing.

Reference numeral 31 denotes a heat insulating partition wall having heat insulating properties.
Reference numeral 32 denotes ventilation holes provided at two locations on the heat insulating partition wall 31, and reference numerals 30a to 30e denote first to fifth five ventilation fans disposed below the cabinet 24 near one of the ventilation holes 32. is there. Reference numeral 33 denotes a cold storage room, which is defined by the heat insulating partition wall 31 and is formed above the cold storage main body 23.

Reference numeral 34 denotes a compressor, 35 denotes a condenser, and 36 denotes a fan for the condenser, which is mounted on the outside of the lower heat insulating wall of the cool box main body 23. A compressor 34, a condenser 35, and a capillary tube (not shown) are connected in series to form a refrigerator unit 37, which is connected to a cooler 29 in the cool storage chamber 27 to form a refrigeration cycle.

Reference numeral 38 denotes a temperature detector for detecting the temperature of the regenerator 28, which is attached to the regenerator 28 with a predetermined heat capacity in the vicinity thereof. Numeral 39 indicates a cooled transported product such as fresh food brought from a production area or the like, and numeral 40 indicates a power supply code. Reference numeral 41 denotes a refrigerator internal temperature detector that is installed in the upper part of the cold storage room 33 and detects the temperature of the cold storage room. 42 is a temperature detector 38
Is a temperature judging means for sending out a signal when the temperature detected in step S1 becomes lower than a preset temperature T1.

Reference numeral 43 denotes a power supply cord 40 which is inserted.
This is power input determination means for determining whether commercial power is applied to the cooling unit 37. Reference numeral 44 denotes a compressor control unit that controls the compressor 34 to be OFF at T1 and ON at T2 based on the temperature detected by the temperature detection unit 38. A charger 45 charges the rechargeable storage battery 46 during the cold storage operation. Reference numeral 47 denotes a ventilation fan control unit that receives power from the rechargeable storage battery 46 during the cold storage operation and controls the ventilation fans 30a to 30e to be turned on at T4 and turned off at T3.

Reference numeral 48 denotes a charge end detecting means for sending a signal when the charging of the rechargeable storage battery 46 from the charger 45 is completed. 49 is a temperature judging means 42 and a charging end detecting means 48
Cold storage completion determining means 50 for determining that the cold storage operation has been completed based on the signal transmitted from
Is a cold storage completion display means (for example, LED, neon lamp, etc.) for displaying that the cold storage is completed.

Reference numeral 51 denotes a cold-reserving display means for displaying that the cold-retaining chamber 33 is being kept cold when the cold-retaining chamber 33 is controlled to an arbitrary set temperature. Reference numeral 52 denotes a cool switch for starting or stopping the cool at any time. Reference numeral 53 denotes power supply means for outputting 12 V DC from the commercial power supply, which is a power supply for the ventilation fans 30a to 30e, and serves as a power supply for the ventilation fans 30a to 30e while the commercial power supply is ON. Reference numeral 54 denotes a power supply for the ventilation fans 30a to 30e,
Power supply switching means for switching to 3; power input determination means 4
3 when the commercial power supply is ON,
When the commercial power is off, the mode is switched to the rechargeable storage battery 46.

Reference numeral 55 denotes a temperature detected by the temperature detection unit 38 at the start of the operation of the ventilation fan 30 at an arbitrary temperature (10 ° C.,
If it is higher than T5), it is a temperature detecting means for sending a signal to the ventilation fan control means 47.

The operation of the cold storage type cold storage constructed as described above will be described below with reference to FIGS.

FIG. 2 shows an example of a timing chart of the freezing mode and the power supply switching mode function in the present embodiment, and FIG. 3 shows the cooling mode and the power supply switching mode in the present embodiment. FIG. 4 shows an example of a timing chart of the mode function, and FIG. 4 shows an example of a flowchart in the present embodiment. In the figure, A and C are the temperatures in the cold storage room 33, and B and D are the temperatures of the cold storage agent 28.

First, the freeze mode function will be described. In the cold storage operation, the power input determination means 43 detects that the power cord 40 has been inserted into the power supply at time t0 (step S1), and the compressor operation means 44 operates the compressor 34 to perform the cold storage operation (step S2). ). Then, the regenerator 28 is cooled by the cooled cooler 29. As the temperature of the cool storage agent 28 decreases, the temperature of the temperature detecting unit 38 of the cool storage agent 28 also decreases. Further, when the cooling progress temperature reaches T1 at time t1, the temperature becomes lower than the temperature set by the temperature judging means 42, and a signal is transmitted.

The compressor control means 44 receives the signal and stops the compressor 34 (step S3) to stop the cooling operation. After the cooling operation is stopped, when the temperature of the temperature detecting unit 38 rises and exceeds T2 (T2-T1 is differential) at time t2, the compressor 34 operates again to perform the cooling operation. As described above, the compressor 34 repeats ON / OFF and the regenerator 28
Will be kept at a constant temperature. During this cold storage operation, the rechargeable storage battery 46 is charged by the charger 45.

When the rechargeable storage battery 46 is almost fully charged, a signal is sent from the charging end detecting means 48 (step S4). At time t1, the temperature determination means 42 (step S
When both 5) and the signal from the charge end detecting means 48 are generated, the cold storage completion determining means 49 determines that the cold storage operation has been completed (step S6), and the cold storage completion displaying means 50.
At the same time (step S7), a signal is sent to the ventilation fan control means 47, and the ventilation fan control means 47 causes the ventilation fan 30a.
The temperature of the cold storage room 33 is controlled to an arbitrary set temperature by ON / OFF control of ３０30e, and the user is informed by the cold storage display means 51 that the cold storage is being performed (step S8).

Here, the method of controlling the ventilation fans 30a to 30e is such that the temperature in the cooling chamber 33 is equal to or higher than T4 (time t1, t1).
It turns on when it becomes 2), and becomes O when it becomes T3 or less (time t3).
FF is performed (step S9), which is ON / OFF control. In particular, as an ON control method, at time t1 when the temperature detecting means 55 is sending an ON signal, the number of air volumes that can cool the inside of the cold storage chamber 33 to an arbitrary set temperature is provided. Turn on all of the first to fifth ventilation fans 30a to 30e having twice the amount of air (step S1).
0), the time (t) from normal temperature to an arbitrary set temperature
2-t1) can be extremely short.

Further, at time t4 when the temperature detecting means 55 is OFF, only the first ventilation fan 30a and the second ventilation fan 30b which have the minimum air flow that can cool the inside of the cooling room 33 to an arbitrary set temperature are used. By turning ON, it is 2 at the time of cold storage transportation
Since the power consumption of only the ventilation fans 30a and 30b only needs to be considered, the capacity of the rechargeable storage battery 46 can be small.

Then, the transporter puts the transported goods 39 into the cool room 33, and at time t5, removes the power supply cord 40 from the power supply and places it on a transport truck or the like to transport it to the destination. At this time, the inside of the cool box main body 23 is cooled by the latent heat of fusion of the cold storage agent 28 and the ventilation fan control means 47, so that the temperature rise of the transported goods 39 can be prevented.

Also, after the power cord 40 is unplugged (time t5, t10), an arbitrary time (3 hours later, time t6, t1)
In 1), the load (the ventilation fans 30a and 30b, etc.) of the rechargeable storage battery 46 is turned off by the timer means (step S).
12, step S13, step S14), unnecessary operation of the ventilation fan 30 after transportation is stopped, so that useless discharge of the rechargeable storage battery 46 can be prevented.

Next, the cooling mode function will be described. First, if the transport staff wants to prepare the cool room 33 early,
After the power cord 40 is inserted at time t7, the cool switch 52 is pressed, and the cold storage chamber 3 is controlled by the ventilation fan control means 47 under the same control as the freeze mode even during the cold storage of the cold storage agent 28.
3 is controlled to an arbitrary set temperature (step S15).

If the transporter wants to stop the cooling operation, the cooling switch 52 is pressed again at time t8 to stop the operation (step S16), and the temperature control of the cooling room 33 is stopped. If the user wants to keep the cool again, he presses the cool switch 52 again at time t9.

Next, the power supply switching mode function of the ventilation fans 30a to 30e will be described. The charging voltage of the charger 45 is equal to or higher than the operation guarantee voltage of the ventilation fans 30a to 30e (ventilation fan rated DC 12V), and it is impossible to use the ventilation fan during charging from the rechargeable storage battery 46. The charging current is supplied to the ventilation fan 3 even when using
0a to 30e are used, so that the charging time is greatly lengthened, or recharging must be performed by using the ventilation fans 30a to 30e after charging is completed.

Therefore, the power supply switching means 54 automatically switches the rechargeable battery 46 from the power supply means 53 when the commercial power supply is turned on and the rechargeable storage battery 46 when the commercial power supply is turned off, to the power supply of the ventilation fans 30a to 30e. By doing so, the ventilation fan can be operated at any time without affecting the others.

As described above, according to the present embodiment, a plurality of ventilation fans that are operated only when the temperature of the cool room is controlled, temperature detecting means for detecting the temperature of the cool room, and operation control of the ventilation fan. When the temperature of the cold storage room is equal to or higher than an arbitrary temperature by the temperature detecting means at the start of the operation of the ventilation fan, all the plurality of ventilation fans are operated by the ventilation fan control means, When the temperature of the cold storage room is lower than an arbitrary temperature, since at least one of the ventilation fans is stopped by the ventilation fan control means, the temperature in the refrigerator is reduced from room temperature to an arbitrary set temperature in a short time. Can be done.

Furthermore, when the temperature in the cool room is kept near an arbitrary set temperature, at least one ventilation fan is stopped, so that the rechargeable storage battery used as a power supply for the ventilation fan is small, and the installation space is small. Less is needed, and the cost is lower. Furthermore, the transport staff can use the cold storage type cold storage simply by turning on the power. Also, for example, if you want to use the cool storage cooler immediately after turning on the power,
By pressing the cool switch after turning on the power, it can be used in a short time.

Further, since the load on the rechargeable battery is automatically turned off at an arbitrary time after the power is turned off, the rechargeable battery can be used for a long time without deterioration in performance of the rechargeable battery due to human error.

In the embodiment, the display means may be not only a display such as a lamp and an LED, but also a means for informing within the scope not departing from the gist.

[0041]

As described above, the present invention relates to a cold storage compartment comprising a cold storage compartment containing a cold storage agent and a cooler, a cold storage compartment for cooling transport goods such as food, the cold storage compartment and the cold storage compartment. A heat insulating partition wall for partitioning the chamber and providing ventilation holes, a plurality of ventilation fans that operate only when controlling the temperature of the cold storage room, a rechargeable storage battery for operating the ventilation fan, and the rechargeable storage battery. A charging device for charging; a temperature detecting means for detecting a temperature of the cooling room; and a ventilation fan control means for controlling operation of the ventilation fan, wherein the temperature of the cooling room at the start of operation of the ventilation fan is the temperature detection means. When the temperature is equal to or higher than an arbitrary temperature, all of the plurality of ventilation fans are operated by the ventilation fan control means, and when the temperature of the cold storage room is lower than the arbitrary temperature, at least one ventilation fan is controlled by the ventilation fan control means. Since serial keep the ventilation fan is stopped, it can be reduced in a short time on any set temperature cold room temperature from a room temperature.

Further, when the temperature in the cold storage room is kept near an arbitrary set temperature, at least one ventilation fan is stopped, so that the rechargeable storage battery used as a power supply for the ventilation fan is small and the installation space is small. It is a cold storage cooler that requires less and is less expensive.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a cold storage type cold storage according to one embodiment of the present invention.

FIG. 2 is a timing chart of a freezing mode and a power supply switching mode function of the regenerative refrigerator of FIG. 1;

FIG. 3 is a timing chart of a cold storage mode and a power supply switching mode function of the cold storage type cold storage box of FIG. 1;

FIG. 4 is a flowchart of the cold storage type cold storage of FIG. 1;

FIG. 5 is a longitudinal sectional view showing the structure of a conventional cold storage type cool box;

FIG. 6 is an electric circuit diagram of the cool storage type cold storage of FIG. 5;

[Explanation of symbols]

 23 Cool storage main body 27 Cool storage room 28 Cool storage agent 29 Cooler 30a First ventilation fan 30b Second ventilation fan 30c Third ventilation fan 30d Fourth ventilation fan 30e Fifth ventilation fan 31 Insulated partition wall 32 Vent hole 45 Charger 46 Charger Storage battery 47 ventilation fan control means 55 temperature detection means

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-1-302086 (JP, A) JP-A-2-251076 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25D 11/00-31/00

Claims (1)

(57) [Claims] 1. A cold storage room containing a cool storage agent and a cooler,
A cool box main body composed of a cool room for keeping the transported goods such as food cool, a heat insulating partition wall for partitioning the cool storage room and the cool room and providing ventilation holes, and a plurality of units that operate only when controlling the temperature of the cool room. The number of ventilation fans, a rechargeable storage battery for operating the ventilation fan, a charger for charging the rechargeable storage battery, and a temperature detection unit for detecting a temperature of the cool room,
Ventilation fan control means for controlling the operation of the ventilation fan, wherein when the temperature of the cold storage room is equal to or higher than an arbitrary temperature by the temperature detection means at the start of the operation of the ventilation fan, the plurality of the plurality of ventilation fans are controlled by the ventilation fan control means. When all the ventilation fans are operated and the temperature of the cold storage room is lower than an arbitrary temperature,
A cool storage type cold storage, wherein at least one of said ventilation fans is stopped by said ventilation fan control means.