JPH06174355A - Refrigerator - Google Patents

Abstract

PURPOSE:To provide a refrigerator in which it can be effectively and smoothly used as the refrigerator when it is used after being installed and further it can transport some items while being smoothly freezed or kept at a low temperature under utilization of melting latent heat of cold heat accumulative agent during its transportation. CONSTITUTION:A cold heat accumulative agent and a cooler 33 for freezing the cold heat accumulative agent are installed within an air duct 14. In the case that an AC power source AC is being applied, a compressor 26 and a blower 37 are operated so as to perform a freezing of the cold heat accumulative agent with the cold heat accumulative agent freezing cooler 33 and a cooling of a storing chamber 8 are carried out, and in turn when the AC power source AC is turned off, the blower 37 is operated with a battery cell 29 and then an inside part of the storing chamber 8 is cooled with the melting latent heat of the cold heat accumulative agent. A refrigerator operating cooler device 36 having a higher evaporating temperature than that of the cold heat accumulative agent freezing cooler 33 is installed within the air dust 14. Refrigerant got from the compressor 26 flows to either a refrigerator operating cooler 36 or the cold heat accumulative agent freezing cooler 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low temperature chamber capable of cooling a storage chamber by utilizing latent heat of fusion of a cold storage agent.

[0002]

2. Description of the Related Art Regarding a low-temperature storage for transportation in which a cold storage agent is frozen in advance by a cooling device and then the storage chamber is cooled by the latent heat of fusion of the cold storage agent, the applicant previously filed Japanese Patent Application No.
Filed as 307926.

According to this application, in a state where the cold storage is connected to an AC power source, the compressor is operated to freeze the cold storage agent by the cooler based on the output of the cold storage agent temperature sensor for detecting the temperature of the cold storage agent. , In addition to the operation control of the compressor after freezing of the cold storage agent, the blower is operated based on the output of the internal temperature sensor that detects the temperature of the storage chamber to cool the cool air cooled by the cooler (and the cold storage agent). It can be supplied to the storage chamber, cooled inside the storage chamber, and kept at a predetermined low temperature.

When transporting low-temperature articles, the low-temperature storage is disconnected from the AC power source, the blower is operated by the battery, and cold air cooled by the latent heat of fusion of the regenerator is supplied into the storage chamber for cooling. Therefore, the article can be smoothly transported in a low temperature state.

[0005]

By the way, in recent years, the number of catering services called catering has increased in hotels and restaurants, and food is kept in a low temperature state when performing such catering services. When delivering (in this case, a delivery time of about 5 hours is expected), the low-temperature warehouse as described above can be used very effectively.

However, in such a hotel or the like, daily delivery is not necessary, so the cold storage is usually installed in the kitchen of the hotel, that is, in the place where the AC power source exists, and is used as a normal refrigerator. It will be.
On the other hand, in the case of the conventional low-temperature storage, the cold storage agent is first frozen after the power is turned on and the freezing operation is performed, or the inside of the storage chamber is cooled after the freezing is completed. There were various problems in using it as a refrigerator.

That is, when the refrigerator is used as a refrigerator, it is not necessary to freeze the cold storage agent, and therefore, energy for freezing the cold storage agent is wasted in the conventional low-temperature storage. In particular, if the storage compartment is cooled after the cold storage agent is frozen, it cannot be used as a refrigerator for a long time (about 8 hours) until the cold storage agent is frozen.
Further, even when the storage chamber can be cooled during cold storage, most of the cooling capacity is spent for freezing the cold storage agent, so that the cooling speed of the storage chamber becomes slow.

Further, since the evaporation temperature of the cooler is considerably lowered in order to freeze the regenerator, if the inside of the store room is cooled by such a low temperature cooler, the humidity in the store room becomes extremely low and the cooler is stored. There has been a problem that the quality of quality of products such as foods is drastically increased and the quality of products is deteriorated.

The present invention has been made to solve the above-mentioned conventional technical problems, and when installed and used, it can be extremely effectively and smoothly used as a refrigerator, and a cold storage agent during transportation. It is an object of the present invention to provide a low temperature warehouse that can smoothly deliver an article at a low temperature by utilizing the latent heat of fusion.

[0010]

A low temperature refrigerator 1 according to the present invention comprises a storage chamber 8 for storing articles, a ventilation passage 14 partitioned from the storage chamber 8 by a partition member, and a ventilation passage 14 in the ventilation passage 14. The installed regenerator 34 and the regenerator freezing cooler 33, the compressor 26, the blower 37 for forcibly circulating the cool air in the ventilation passage 14 into the storage chamber 8, and the storage battery 29 are provided. When the power supply AC is applied, the compressor 26 and the blower 37 are operated, and the cool storage agent 3 is cooled by the cool storage agent freezing cooler 33.
4 is frozen and the storage room 8 is cooled, and when the AC power supply AC is cut off, the storage battery 29 drives the blower 37 to operate the cool storage agent 34.
Which cools the inside of the storage chamber 8 by the cold air cooled by the latent heat of fusion of the refrigerator, and the refrigerator operation cooler 36 having a higher evaporation temperature than the cool storage agent freezing cooler 33 in the ventilation passage 14.
And a flow path switching device (solenoid valves 39, 42) for flowing the refrigerant from the compressor 26 to either the refrigerator operating cooler 36 or the cool storage agent freezing cooler 33. .

Further, in the low temperature warehouse 1 of the second aspect of the present invention, the suction pipe 4 of the compressor 26 in which the refrigerant discharged from the refrigerator operating cooler 36 or the cold storage agent freezing cooler 33 flows in the above.
The auxiliary cooling device 47 is configured by a part of the auxiliary cooling device 4, and the auxiliary cooling device 47 is provided on the wall surface of the storage chamber 8.

Further, in the low temperature cabinet 1 of the third aspect of the invention, in the above, the ventilation passage 14 has the cool air discharge duct 17 and the cool air suction duct 18 located on both sides of the storage chamber 8, and both ducts 17, 18 are provided. Is a cold air discharge port 22 formed on both sides of the storage chamber 8.
And the cold air suction port 23 communicates with the storage chamber 8, respectively.

Furthermore, the low temperature refrigerator 1 of the invention of claim 4 is
In the above, the cool storage agent 34, the cool storage agent freezing cooler 33, and the refrigerator operation cooler 36 are installed in the lower part of the ventilation passage 14 and the auxiliary cooler 47 is provided corresponding to the upper part of the back surface of the storage chamber 8. It is characterized by

[0014]

In the low temperature refrigerator 1 according to the present invention, when the low temperature refrigerator 1 is installed and used in a kitchen or the like, the refrigerant from the compressor 26 is cooled by the flow path switching device (electromagnetic valve 39) for refrigerator operation. By flowing the air into the air blower 36, the cool air cooled by the refrigerator operation cooler 36 is forcedly circulated in the storage chamber 8 by the blower 37. Therefore, normally, the refrigerant does not flow into the cool storage agent freezing cooler 33 having a very low evaporation temperature, and the inside of the storage chamber 8 is cooled by the refrigerator operating cooler 36 having a higher evaporation temperature than the cool storage agent freezing cooler 33. Therefore, the inside of the storage chamber 8 is prevented from being dried, whereby high humidity can be maintained, and since the cold storage agent 34 is not frozen, the energy consumption can be saved accordingly.

When transporting the cold storage 1 for food delivery such as catering, the refrigerant from the compressor 26 is caused to flow to the cool storage agent freezing cooler 33 by the flow path switching device (electromagnetic valve 42). The agent 34 is frozen. In this case, the cool storage agent 34
Is pre-cooled by the cool air from the refrigerator operating cooler 36 while the refrigerant is flowing through the refrigerator operating cooler 36, so that the regenerator 34 can be frozen more quickly than when it is frozen from room temperature. Further, after freezing, the cool air cooled by the latent heat of fusion of the cold storage agent 34 is forcedly circulated in the storage chamber 8 by the blower 37 fed from the storage battery 29.
It is possible to keep the article in a low temperature state even during delivery when the AC power source AC is disconnected.

Further, according to the low temperature warehouse 1 of the invention of claim 2, the low temperature refrigerant discharged from the refrigerator operating cooler 36 or the cool storage agent freezing cooler 33 is an auxiliary cooler 47 provided on the wall surface of the storage chamber 8. , The inside of the storage chamber 8 is also cooled by the auxiliary cooler 47. Therefore, the cooling capacity of the storage chamber 8 is insufficient, especially while the refrigerant is flowing through the cooler for cooling the cold storage agent 33, but this can be supplemented by the cooling from the auxiliary cooler 47. Further, as freezing of the cold storage agent 34 progresses, a large amount of the non-evaporated liquid refrigerant flows out from the cool storage agent freezing cooler 33, but since this can be evaporated by the auxiliary cooler 47, the compressor 26 by liquid return. The damage of can be avoided in advance.

Further, according to the low temperature cabinet 1 of the invention of claim 3, the cool air discharge ducts 17 and the cold air suction ducts 18 are formed on both sides of the storage chamber 8, and the cold air discharge ports communicating with the inside of the storage chamber 8 respectively. Since 22 and the cold air suction port 23 are formed on both sides of the storage chamber 8, it is possible to reduce the front-rear width dimension of the low temperature chamber 1 and make the temperature in the storage chamber 8 uniform.

Furthermore, according to the low temperature storage 1 of the invention of claim 4, when the regenerator 34, the regenerator freezing cooler 33 and the refrigerator operating cooler 36 are present in the lower part of the ventilation passage 14,
Although the upper part of the storage chamber 8 is insufficiently cooled and the temperature tends to increase, the auxiliary cooler 47 is arranged corresponding to the upper part of the rear face of the storage chamber 8, so that the insufficient cooling of the upper part inside the storage chamber 8 is compensated for. The inside of the storage chamber 8 can be cooled uniformly.

[0019]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view of a low temperature refrigerator 1 of the present invention, and FIG. 2 is a low temperature refrigerator 1.
Is a vertical sectional front view, FIG. 3 is a vertical sectional side view of the low temperature chamber 1, and FIG. 4 is a refrigerant circuit diagram of the low temperature chamber 1. The cold storage 1 includes a heat-insulating box body 2 that is open to the front, left and right duct plates 3 and 4 as partition members that are erected upright and face each other inside the left and right side walls of the heat-insulating box body 2 with a space therebetween. A deck pan 6 as a partition member mounted above the bottom wall of the box body 2 with a space therebetween so as to be openable and closable.
And a rear plate 7 standing upright on the front side of the back wall of the heat insulating box 2, a storage chamber 8 surrounded by the left and right duct plates 3, 4, the deck pan 6 and the rear plate 7, and this storage Double doors 9 and 11 that open and close the front opening of the chamber 8
And a machine room 12 formed below the bottom wall of the heat insulating box 2.

A plurality of wheels 13 are attached to the bottom of the cold storage 1 so that they can be easily loaded on the bed of a transportation means such as a truck, and bumpers 25 are attached to the corners. Further, the front ends of the deck pan 6 and the left and right duct plates 3, 4 are bent at a right angle and are in contact with the heat insulating box body 2, whereby the deck pan 6 and the left and right duct plates 3, 4 are brought into contact with each other.
A series of ventilation passages 14 that are partitioned from the storage chamber 8 are formed between the heat insulation box 2 and the heat insulation box 2. The ventilation passage 14 is composed of a lower duct 16 below the deck pan 6, a cool air discharge duct 17 on the right side of the right duct plate 4, and a cool air suction duct 18 on the left side of the left duct plate 3. In the storage chamber 8, a plurality of stages of wire shelves 19 are installed across the left and right duct plates 3 and 4, and trays 21 on which foods are placed are placed on the wire shelves 19, respectively. The right duct plate 4 is provided with a cold air discharge port 22 that connects the cold air discharge duct 17 and the storage chamber 8 to each of the wire shelves 19 and the space above the deck pan 6, and the left duct plate 3 is formed. A cold air suction port 23 that connects the cold air suction duct 18 and the storage chamber 8 is also provided corresponding to the space above each wire rack 19 and the deck pan 6, respectively, and each cold air discharge port 22 and the cold air suction port 23. Is the upper wire shelf 19 as shown in FIG.
The number corresponding to is increasing.

A compressor 26, a condenser 27, a condenser blower 28, and a storage battery 29 are installed in the machine room 12, and the front surface thereof is closed by a front plate 31. In addition, the display operation panel 3 is provided on the front side of the machine room 12.
2 is provided, and the display operation panel 32 is exposed to the front from the through hole of the front plate 31.

In the lower duct 16 below the deck pan 6, an aluminum roll bond type cold storage agent freezing cooler 33 is installed. The cold storage agent freezing cooler 33 has, for example, a cold storage agent 34 having a freezing point of -7 ° C. Are installed in a heat exchange relationship. In addition, from the right end of the lower duct 16, the cool air discharge duct 1
In the lower right corner of the ventilation passage 14 extending to the lower end of the air conditioner 7, a fin-tube type refrigerator operation cooler 36 is installed in the front-rear direction. Further, in the lower left corner of the ventilation passage 14 extending from the left end of the lower duct 16 to the lower end of the cool air suction duct 18, an inside cooling fan 37 (two units in the embodiment) including a DC motor is provided.

In FIG. 4, a condenser 27 is connected to a discharge pipe 38 extending from the discharge side of the compressor 26.
The outlet side is branched into two, one is connected to the refrigerator operating cooler 36 via the solenoid valve 39 and the capillary tube 41 which constitute the flow path switching device, and the other also constitutes the flow path switching device. It is connected to the cooler 33 for freezing the regenerator via a solenoid valve 42 and a capillary tube 43 that operate. At this time, the flow path resistance of the capillary tube 43 is made larger than that of the capillary tube 41, whereby the evaporation temperature of the refrigerant in the cool storage agent freezing cooler 33 is made lower than the evaporation temperature in the refrigerator operating cooler 36. In the example, the evaporation temperature in the cooler 33 for cooling the regenerator is -20 ° C, and the evaporation temperature in the refrigerator operation cooler 36 is -10 ° C.

The pipes from the cooler 33 for cooling the regenerator and the cooler 36 for operating the refrigerator are joined to form a suction pipe 44, which is connected to the suction side of the compressor 26 via an accumulator 46. A part of the pipe 44 is attached to the back surface of the back plate 7 in a meandering shape by a pressing member such as an aluminum tape to form an auxiliary cooler 47. This auxiliary cooler 47 is provided corresponding to the upper part of the storage room 8,
A heat insulating material 48 is filled between the back surface of the back plate 7 and the heat insulating box 2.

Inside the cold air suction duct 18, there is provided an inside temperature sensor 51 which substantially detects the temperature in the storage chamber 8 from the temperature of the sucked air, and the cold storage agent 34 has a cold storage agent temperature sensor which detects the temperature. 52 is provided. Further, a heater 53, which is an electric heater that constitutes a defrosting device, is attached to the refrigerator operation cooler 36, and a plug 54 for connecting to the AC power supply AC is pulled out from the cold storage 1.

Next, FIG. 5 shows a front view of the display operation panel 32, and FIG. 6 shows an electric circuit diagram of the control device 56 of the cold storage 1. The display operation panel 32 of FIG. 5 has a cold storage operation switch 61 as a changeover switch, and 5 ° C. for setting the temperature in the storage chamber 8 during the refrigerator operation to + 5 ° C. (refrigeration) and 0 ° C. (ice temperature). A refrigeration selection switch 62 and a 0 ° C. ice temperature selection switch 63 are provided, and a storage room 8 is provided at the bottom.
A display 64 is provided for displaying the internal temperature. Further, the cold storage operation switch 6 is provided on the display operation panel 32.
1 is pressed and turned on, then is pressed and turned off again to store the cold storage LED 66, the cold storage completion LED 67 for displaying the completion of freezing of the cold storage agent 34, and the 5 ° C. refrigeration selection switch 62 is pressed to store in the storage chamber 8. The 5 ° C selection LED 68 for displaying that the set temperature is + 5 ° C and the 0 ° C ice temperature selection switch 63 are pressed to display that the set temperature in the storage chamber 8 is 0 ° C. A 0 ° C. selection LED 69 is provided.

Next, the control device 56 in FIG. 6 comprises a general-purpose microcomputer 71. The microcomputer 71 has a memory 71M, and the input of the microcomputer 71 is the inside temperature sensor 51, the cold storage agent temperature sensor 52, and the cold storage operation switch 6
Outputs of the 1, 5 ° C. refrigeration selection switch 62 and the 0 ° C. ice temperature selection switch 63 are connected, and the cold storage LED 66 and the cold storage completion LE are connected to the output of the microcomputer 71.
D67, 5 ° C. selection LED 68, 0 ° C. selection LED 69 and indicator 64 are connected, and further, the relay coil 7 is provided as an output.
2, 73, 74 and 75 are connected.

AC power source A connected via a plug 54
A rectifier circuit 76 is connected to C, and power is supplied from the rectifier circuit 76 to the microcomputer 71 and the storage battery 29. Further, the inside cooling fan 37 is connected to the output of the rectifier circuit 76 in series with the normally open contact 72A of the relay coil 72. The electric charge charged in the storage battery 29 is discharged when the AC power supply AC is cut off, and can be supplied to the microcomputer 71 and the inside cooling fan 37. The AC power supply AC has a normally open contact 73 of the relay coil 73.
A heater 53 is connected in series with A, and a parallel circuit of the compressor 26 and the condenser blower 28 is connected in series with the normally open contact 74A of the relay coil 74. Further, the contact 75A of the relay coil 75 is constituted by a double contact, the solenoid valve 39 is connected in series to one normally closed contact, and the solenoid valve 42 is connected in series to the other normally open contact. There is.

Next, the microcomputer 7 shown in FIG.
The operation of the cold storage 1 will be described with reference to the flow chart of No. 1 and the temperature transition and timing chart of FIG.
When the cold storage 1 is installed in a kitchen or the like of the hotel and the plug 54 is connected to the AC power supply AC, the rectifier circuit 76 supplies power to the microcomputer 71 and also starts charging the storage battery 29. The microcomputer 71 applies the AC power supply AC, and then in step S1, the inside temperature sensor 5
1, cold storage agent temperature sensor 52, cold storage operation switch 61,
5 ℃ refrigeration selection switch 62 and 0 ℃ ice temperature selection switch 6
Data such as temperature and setting is read from each output of 3 and set (stored) in the memory 71M. Here, the 0 ° C. ice temperature selection switch 63 is pressed and the set temperature of the storage room 8 is 0.
It is assumed that the temperature is 0 ° C., and the microcomputer 71 lights the 0 ° C. selection LED 69.

Next, in step S2, the microcomputer 71 first enters the refrigerator operation mode, and the relay coil 7
5, the contact 75A is closed to a normally closed contact, the solenoid valve 39 is opened (hatched portion in FIG. 8), and the solenoid valve 42 is closed. Further, the microcomputer 71 determines that the temperature inside the storage room is + O. When the temperature rises above 5 ° C, the relay coil 74 is energized and the normally open contact 74
A is closed, the compressor 26 and the condenser blower 28 are operated (ON), and the temperature in the storage chamber is -O. When the temperature drops to 5 ° C. or lower, the relay coil 74 is de-energized and the compressor 26 and the condenser blower 28 are stopped (OFF). Further, the microcomputer 71 energizes the relay coil 72 to constantly close the normally open contact 72A, whereby the inside cooling fan 3 is cooled.
7 is continuously operated (ON).

By the refrigerator operation, the refrigerant discharged from the compressor 26 is condensed in the condenser 27, and then the solenoid valve 39
After that, the pressure is reduced by the capillary tube 41, flows into the refrigerator operation cooler 36, and is evaporated. As a result, the refrigerator operation cooler 36 exerts a cooling action, but the refrigerating agent freezing cooler 33 does not exert a cooling action because no refrigerant flows into the refrigerator. The low-temperature refrigerant discharged from the refrigerator operation cooler 36 returns from the suction pipe 44 to the compressor 26 via the auxiliary cooler 47. On the other hand, the internal cooling blower 37 is operated to suck the air in the cold air suction duct 18 and blow it out toward the cool storage agent freezing cooler 33 in the lower duct 16, so that the cooling operation of the refrigerator operating cooler 36 is performed. Ventilation passage 1 cooled by
The cold air in the inside 4 is driven by the blower 37 for cooling the inside of the refrigerator.
It is blown up in the direction of the cool air discharge duct 17 as indicated by the middle broken line arrow, and each wire rack 1 is fed from the cool air discharge port 22 on the right side of the storage chamber 8.
It is blown out into the space above 9 and the deck pan 6. The cold air circulating in the space above each wire rack 19 and the deck pan 6 flows to the left side of the storage chamber 8 as it is, and the cold air suction port 23 on the left side.
Then, it flows into the cool air suction duct 18 and returns to the in-compartment cooling blower 37. Due to such cooling, the temperature inside the storage chamber gradually decreases, and is eventually controlled to the set temperature (0 ° C.).

At this time, the cold air discharge duct 17 and the cold air suction duct 18 are arranged on both sides of the storage chamber 8 so that the cool air is circulated in the storage chamber 8 in the left-right direction. The size can be reduced. Also,
Since the numbers of the cold air discharge ports 22 and the cold air suction ports 23 are increased toward the upper side, it is possible to uniformly cool the inside of the storage chamber 8 by increasing the amount of cold air circulation in the upper portion of the storage chamber 8 where the temperature tends to rise. it can. Further, the inside of the storage chamber 8 is also cooled by the back plate 7 by the low-temperature refrigerant flowing into the auxiliary cooler 47, and in particular, the presence of the auxiliary cooler 47 at the upper portion causes the temperature of the storage chamber 8 to rise. Better cooling of the inner upper part can be achieved. Furthermore, refrigerator 3 for refrigerator operation
Since the evaporation temperature of 6 is relatively high, drying of the stored food in the refrigerator operation is suppressed, and the inside of the storage chamber 8 is maintained at high humidity (for example, 80%). Then, the cool storage agent 34 is pre-cooled to about 0 ° C. by the circulation of the cool air in the refrigerator operation cooler 36.

Further, since the microcomputer 71 automatically enters the refrigerator operation mode when the AC power supply AC is turned on, the usability when the low temperature cabinet 1 is installed and used as a refrigerator is improved. Moreover, since the compressor 26 is controlled based on the internal temperature sensor 51, the temperature control in the storage chamber 8 can be achieved with high accuracy. by the way,
During the operation of the refrigerator in step S2, the microcomputer 71 integrates the operating time by the timer as its function. For example, after 12 hours, the relay coil 7
4 is de-energized, the compressor 26 is stopped, and the relay coil 73 is energized to close the normally open contact 73A.
3 is energized to start defrosting (def) of the refrigerator operation cooler 36. This defrosting is finished at a predetermined defrosting end temperature (+ 8 ° C. or the like) of the refrigerator operating cooler 36. By thus allowing the refrigerator operating cooler 36 to be defrosted by the heater 53, It is no longer necessary to defrost by sprinkling water as in the conventional case, and the low temperature refrigerator 1 can be used smoothly just like a normal refrigerator.

The refrigerator operation is executed until the cold storage operation switch 61 is pressed in step S3. And
When it becomes necessary to transport the low temperature refrigerator 1 due to catering schedule, the cold storage operation switch 61 is pressed. Then, the microcomputer 71 performs steps S3 to S
The operation proceeds to 4 to enter the cold storage operation mode, and the cold storage operation is started. In this cold storage operation, the microcomputer 71 energizes the relay coil 75 to close the contact 75A to the normally open contact, opens the solenoid valve 42, and closes the solenoid valve 39. The microcomputer 71 continuously energizes the relay coil 74 until the freezing completion condition described later is satisfied, and the compressor 26
The temperature in the storage chamber is + O. When the temperature rises to 5 ° C. or more, the relay coil 72 is energized, the normally open contact 72A is closed, and the inside cooling fan 37 is operated (ON), and the temperature in the storage chamber is −.
O. When the temperature drops to 5 ° C. or less, the relay coil 72 is de-energized and the inside cooling fan 37 is stopped (OFF).

In the cold storage operation, the refrigerant discharged from the compressor 26 is condensed in the condenser 27, then is decompressed by the capillary tube 43 through the solenoid valve 42, and flows into the cool storage agent freezing cooler 33. Evaporate. As a result, the cooler 33 for freezing the regenerator exerts a cooling action, but the refrigerating device cooler 36 does not exert a cooling action because no refrigerant flows therein. The low-temperature refrigerant that has exited the cooler 33 for cooling the cold storage agent returns from the suction pipe 44 to the compressor 26 via the auxiliary cooler 47. The cool storage agent 34 is directly cooled by the cooler 33 for freezing the cool storage agent, and the temperature thereof drops as shown by the broken line in FIG. Especially, since the compressor 8 is continuously operated at this time,
Freezing proceeds rapidly. Then, the temperature of the cold storage agent 34 eventually reaches the freezing point of −7 ° C., but at this time, the cold storage agent 3
Since No. 4 is pre-cooled to around 0 ° C. in the refrigerator operation, the time until freezing of the cold storage agent 34 can be further shortened. On the other hand, the blower 37 for cooling the inside of the refrigerator cools the cool air in the ventilation passage 14 cooled by the cooling action of the cooler 33 for freezing the cold storage agent, as described above, as shown by the broken line arrow in FIG.
It is blown up in seven directions and blown out from the cold air discharge port 22 on the right side of the storage chamber 8 into the space above each wire rack 19 and the deck pan 6.

The temperature of the storage chamber is controlled to the set temperature (0 ° C.) by such cooling, but at this time, as described above, the temperature of the storage chamber 8 tends to be high, and the flow rate of the cool air in the upper portion of the storage chamber 8 is increased. It is possible to satisfactorily cool the upper portion in the storage chamber 8 where the temperature tends to rise. Further, since the inside of the storage chamber 8 is also cooled by the back plate 7 by the low-temperature refrigerant flowing into the auxiliary cooler 47, the cooling capacity of the storage chamber 8 is lowered due to the freezing of the cold storage agent 34. Moreover, the inside of the storage chamber 8 can be satisfactorily cooled. In particular, the presence of the auxiliary cooler 47 in the upper portion allows better cooling of the upper portion in the storage chamber 8 where the temperature tends to rise, and the cooling of the storage chamber 8 during the cold storage operation can be performed smoothly and uniformly. Will be able to achieve.

The cold storage operation is executed until the freezing completion condition is satisfied in step S5, the freezing of the cold storage agent 34 is completed, and the temperature further decreases and reaches -12 ° C. 1
If 0 minutes has passed and the charging of the storage battery 29 is completed at this time, the above-mentioned freezing completion condition is satisfied. The microcomputer 71 judges this based on the output of the cold storage agent temperature sensor 52, and when the above-mentioned freezing completion condition is satisfied, the routine proceeds from step S5 to step S6 and shifts to the freeze holding operation.

In this freeze-holding operation, the microcomputer 71, based on the output of the cold storage agent temperature sensor 52, relay coil 74 when the cold storage agent temperature rises to -12 ° C or higher.
Is energized, the normally open contact 74A is closed to operate the compressor 26 (ON), and when the temperature of the cold storage agent falls below -14 ° C, the relay coil 74 is de-energized to stop the compressor 26 (OF
By performing F), the cold storage agent 34 is kept in a frozen state. Therefore, the cold storage agent 34 is held in a frozen state even if the preparation for preparation is delayed and the delivery is delayed.
In addition, the microcomputer 71 is the inside temperature sensor 5
Based on the output of No. 1 as well as the cool storage operation
7 is controlled to maintain the temperature in the storage chamber 8 at 0 ° C.

The freezing and holding operation is continued until the plug 54 is unplugged in step S7 and the AC power source AC is cut off, but the microcomputer 71 uses the timer as its function to push the cold storage operation switch 61 in step S8. Is monitored (time after entering the cold storage operation mode), and, for example, when 24 hours have passed, the process returns to step S2 and returns to the refrigerator operation mode. Therefore, the catering schedule entered and the cold storage operation was started,
If the delivery is canceled after that, even if the user forgets to return to the refrigerator operation mode, the microcomputer 71 automatically returns to the refrigerator operation mode. Therefore, the cold storage agent generated by continuing the cold storage operation mode. It is possible to prevent the growth of frost on the freezing cooler 33 and the deterioration of the temperature controllability in the storage chamber 8 in advance. on the other hand,
Since the frost that has grown on the cool storage agent freezing cooler 33 in the cold storage operation mode is sublimated and defrosted by the cool air from the refrigerator operation cooler 36 in the next refrigerator operation mode,
There is no need to remove frost from the cooler 33 for freezing the regenerator by spraying water as in the conventional case.

Further, in the freezing holding operation, the evaporation of the refrigerant in the cooler 33 for freezing the cold storage agent also decreases, so that a relatively large amount of the non-evaporated liquid refrigerant flows into the suction pipe 44. However, the liquid refrigerant is not the auxiliary cooler 47.
Since it is supplied to and is evaporated there, and is used for cooling the storage chamber 8, it is possible to prevent the occurrence of damage to the components due to the liquid returning to the compressor 26.

Before the 24 hours have passed, the plug 54
When the power is removed and the delivery is started, the microcomputer 71 proceeds from step S7 to step S9 by the disconnection of the AC power supply AC, and enters the cold insulation operation. In this cold keeping operation, the microcomputer 71 and the air blower 3 for cooling the interior
Power is supplied to the battery 7 from the storage battery 29. Then, the microcomputer 71 controls the in-compartment cooling blower 37 based on the output of the in-compartment temperature sensor 51 as in the cold storage operation. In this cooling operation, the cold air cooled by the latent heat of fusion of the regenerator 34 is circulated in the storage chamber 8 by the operation of the internal cooling blower 37, so that the cold air is stored even during the delivery without the AC power supply AC. The temperature in the chamber 8 is maintained at 0 ° C., which enables smooth delivery while maintaining good quality of the food inside.

The cold-keeping operation is continued at step S10 until the AC power supply AC is applied again after the delivery is completed, but the microcomputer 71 is stopped by the timer as a function of the AC power supply AC at step S7. Is monitored (time after the cold storage operation is started), for example, when 6 hours have passed, the process proceeds to step S12 to end the cold insulation operation, and each LED 66 of the display operation panel 32 is monitored.
˜69 and the display 64 are turned off. This reduces the consumption of the storage battery 29, but stores the set contents of the memory 71M (ON). Next, step S
Proceed to step 13 to determine whether the AC power supply AC has been turned on,
If it is applied, the process proceeds to step S2 to return to the refrigerator operation mode, but if not applied, the process proceeds to step S14 and it is determined whether or not three days have elapsed since the AC power supply AC was cut off (step S7) by the timer having the function of the microcomputer 71. After 3 days, turn off all power and finish.

That is, since the microcomputer 71 stores the setting contents in the memory 72M for three days after the AC power supply AC is cut off, even if the user forgets to turn on the power supply, the original setting is performed for three days. It is structured so that the contents can be reconfirmed.

Although the low temperature warehouse 1 of the present invention has been described in the embodiments for catering to hotels, the present invention is effective for transporting all other low temperature articles. Further, it goes without saying that various values (such as refrigeration and ice temperature) and time in the examples can be variously changed (for example, freezing specifications) in accordance with the intended use.

[0045]

As described above in detail, according to the invention of claim 1, when the low temperature storage is installed and used in the place where the AC power source exists, the refrigerant from the compressor is used for the refrigerator operation by the flow path switching device. By flowing into the cooler, the cool air cooled by the refrigerator operation cooler is forcedly circulated by the blower in the storage chamber. Therefore, normally, it is not cooled by the cooler for regenerator freezing, which has an extremely low evaporation temperature,
Since the inside of the storage chamber is cooled by the refrigerator operation cooler having a high evaporation temperature, the inside of the storage chamber is prevented from being dried, and thereby the quality deterioration of the stored article can be prevented. Also,
Since the cold storage agent is not frozen, the energy consumption can be reduced accordingly, and the low temperature storage can be smoothly used as an ordinary refrigerator.

When transporting the cold storage for delivering foods or the like, the refrigerant from the compressor is made to flow to the cooler for freezing the cold storage agent by the flow path switching device to freeze the cold storage agent. At this time, the regenerator can be pre-cooled before being placed by the cool air from the refrigerator operation cooler, so that the regenerator can be frozen more quickly than when it is frozen from room temperature, and the delivery can be performed quickly. become. Also, after freezing, the cool air cooled by the latent heat of fusion of the regenerator is forcedly circulated in the storage room by the blower fed from the storage battery, so that the goods can be kept in a low temperature state well even during delivery when the AC power supply is cut off. You will be able to do it.

According to the second aspect of the present invention, the low temperature refrigerant discharged from the refrigerator operating cooler or the cold storage agent freezing cooler flows into the auxiliary cooler provided on the wall surface of the storage chamber. It can also be cooled by this auxiliary cooler. Therefore, even if the cooling capacity of the storage chamber is insufficient while the refrigerant is flowing through the cooler for freezing the cold storage agent, it can be compensated by the cooling from the auxiliary cooler, so even during freezing of the cold storage agent. The storage chamber can be cooled well. Further, even if a large amount of the non-evaporated liquid refrigerant comes out from the cooler for freezing the cold storage agent and the freezing of the cold storage agent proceeds, it can be evaporated by the auxiliary cooler,
It is possible to avoid damage to the compressor due to liquid return.

Further, according to the third aspect of the present invention, the cool air discharge duct and the cool air suction duct are formed on both sides of the storage chamber, and the cool air discharge port and the cool air suction port communicating with the storage chamber are provided on both sides of the storage chamber. Since it is formed, it is possible to reduce the front-rear width dimension of the low-temperature chamber and make the temperature in the storage chamber uniform.

Further, according to the invention of claim 4, the regenerator, the regenerator freezing cooler and the refrigerator operating cooler are present in the lower part of the ventilation passage, so that the upper part of the storage chamber is insufficiently cooled and the temperature is increased. Even if the temperature tends to be high, the auxiliary cooler is installed corresponding to the upper part of the back of the storage room, so it is possible to compensate for the lack of cooling in the upper part of the storage room, thereby uniformly cooling the storage room. is there.

[Brief description of drawings]

FIG. 1 is a perspective view of a low temperature refrigerator of the present invention.

FIG. 2 is a vertical cross-sectional front view of a low temperature refrigerator.

FIG. 3 is a vertical cross-sectional side view of a low temperature storage.

FIG. 4 is a refrigerant circuit diagram of a low temperature chamber.

FIG. 5 is a front view of a display operation panel.

FIG. 6 is an electric circuit diagram of a low temperature chamber.

FIG. 7 is a flowchart showing a program of a microcomputer.

FIG. 8 is a timing chart showing the time transitions of the temperature inside the storage chamber and the temperature of the cold storage agent and the operating state of each device.

[Explanation of symbols]

 1 Low Temperature Chamber 8 Storage Room 14 Ventilation Path 17 Cold Air Discharge Duct 18 Cold Air Suction Duct 22 Cold Air Discharge Port 23 Cold Air Suction Port 26 Compressor 29 Storage Battery 33 Cooling Agent Freezing Cooler 34 Cooling Agent 36 Refrigerator Operating Cooler 37 Cooling in Storage Blower (blower) 39 Solenoid valve 42 Solenoid valve 44 Suction pipe 47 Auxiliary cooler

Claims (4)

[Claims] 1. A storage chamber for storing articles, a ventilation passage partitioned from the storage chamber by a partition member, a cool storage agent installed in the ventilation passage and a cooler for freezing the cool storage agent, and a compressor. ,
A blower that forcedly circulates the cool air in the ventilation passage in the storage chamber, and a storage battery.When an AC power source is applied, the compressor and the blower are operated to cool the cold storage agent by the cooler. In a low-temperature chamber that freezes the cold storage agent and cools the storage chamber, and when the AC power supply is cut off, operates the blower by the storage battery to cool the storage chamber by cold air cooled by the latent heat of fusion of the cold storage agent. , While providing a refrigerator operation cooler having a higher evaporation temperature than the cool storage agent freezing cooler in the ventilation passage, the refrigerant from the compressor of the refrigerator operation cooler and the cool storage agent freezing cooler A low-temperature warehouse, characterized by being provided with a flow path switching device for flowing into either one. 2. An auxiliary cooler is constituted by a part of a suction pipe of a compressor through which a refrigerant discharged from a refrigerator operation cooler or a cool storage agent freezing cooler flows, and the auxiliary cooler is provided on a wall surface of a storage chamber. The low temperature warehouse according to claim 1, wherein 3. The ventilation passage has a cold air discharge duct and a cold air suction duct located on both sides of the storage chamber, and both ducts are connected to the storage chamber at the cold air discharge port and the cold air suction port formed on both sides of the storage chamber, respectively. The low-temperature refrigerator according to claim 2, which is in communication with each other. 4. A cool storage agent, a cool storage agent freezing cooler, and a refrigerator operation cooler are installed in the lower part of the air passage, and an auxiliary cooler is provided corresponding to the upper part of the rear surface of the storage chamber. The low temperature storage chamber according to claim 3.