JPH0452479A - Cold storage type cold insulation chamber - Google Patents

Abstract

PURPOSE:To shorten freezing time when a cold storage agent is frozen by providing a second freezer unit that constitutes a second freezing cycle by being connected with a second condenser, a defrosting controller for interrupting only a first freezer to defrost a first condenser, and a freezing temperature adjusting unit for controlling operation and interruption of a first freezer unit and the second freezer unit and further controlling freezing temperature of the cold storage agent. CONSTITUTION:A first freezer unit 36 and a second freezer unit 37 are operated until a cold storage agent 33 is frozen and lowered to predetermined temperature -34 deg.C. After the cold storage agent 33 reaches the predetermined temperature -34 deg.C, the first freezer unit 36 and the second freezer unit 37 are controlled in their times of operation and interruption by a freezing temperature adjusting device 45 into predetermined freezing temperature -33+ or -1 deg.C. When an in-chamber fan 26 is in operation, cooling and defrosting are performed by a first cooler 28, so that cold air temperature flowing into a second condenser 32 is equal or lower than melting temperature of the cold storage agent 33. Accordingly, the surface of the cold storage agent 33 is only slightly melted by the inflow cold air and freezing time of the cold storage agent 33 is not prolonged greatly Thus, the cold storage agent 33 can be frozen in a relatively short time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cold-storage type refrigerator that uses a cold storage agent to keep the inside of the refrigerator cold.

BACKGROUND OF THE INVENTION In recent years, in the field of fresh food distribution, small cold storage refrigerators equipped with refrigerators that can transport cool products by being loaded onto general transport vehicles have come into use.

Such a cold storage type cold storage box, for example, was developed in 1372
It is described in Publication No. 62.

An example of the above-mentioned conventional cold storage type cold storage box will be described below with reference to the drawings. In FIG. 4, reference numeral 1 denotes a cold storage box body, which is composed of a cabinet 2 containing a heat insulating material, a door 3, and a gasket 4 for sealing the door 3 and the cabinet 2.

Reference numeral 5 denotes a regenerator cooler, in which a plurality of regenerator plates 6 are arranged in parallel with each other with gaps as shown in FIG. Cold storage plate 6
A meandering part of a single refrigerant evaporation pipe 7 having a meandering part in the middle is housed inside the refrigerant evaporation pipe 7 , and a space between the inner wall of the regenerator plate 6 and the outer peripheral surface of the refrigerant evaporator pipe 7 is filled with a regenerator 8 . has been done.

Reference numeral 9 denotes an internal air blower, which is arranged to blow air in a direction parallel to the plate surface of the cold storage plate 6 of the cold storage cooler 5, thereby blowing air from the inside 1o of the refrigerator through the cold storage cooler 5 as indicated by the solid line arrow. It is circulated in a similar manner. 11 is the refrigerator unit main body, and the compressor 12
．． Condenser 13. A capillary tube (not shown) is built in and connected to the refrigerant evaporation tube 7 to form a refrigeration cycle.

14 is a condenser fan motor, and 15 is a caster. This cold storage type cold storage box is installed in a place where there is a commercial power source, and uses the commercial power source to store the cold storage agent 8 in the cold storage type cooler 5.
The cool storage agent 8 is stored by the evaporation of the refrigerant in the refrigerant evaporation tube, and when there is no commercial power source such as during transportation, the internal blower 9 is operated by the built-in battery (not shown) and the cool storage agent 8 is stored. The latent heat of fusion is used to cool and keep the interior 1Q of the refrigerator cold.

Problems to be Solved by the Invention However, since the cold storage cooler of this cold storage type refrigerator does not have a defrosting means, if it is used continuously, the amount of frost that forms on the outer surface of the cold storage plate 6 increases, causing the cold storage plate The gap between the cooling plate and the cold storage plate is blocked by frost, and the cooling capacity is significantly reduced. Therefore, it is necessary to stop the unit once every 2 to 3 days and defrost it by washing with water, etc., which makes it impossible to use it continuously. Ta.

Furthermore, if the cold storage agent 8 is frozen while cooling the inside of the refrigerator, that is, while operating the internal blower 9, the temperature of the blown air will be higher than the freezing temperature of the cold storage agent 8, so the surface of the cold storage plate 6 will However, there was a problem in that the freezing time was significantly longer than when freezing was performed by forcibly stopping the internal blower 9.

In view of the above-mentioned problems, the present invention reduces frost formation on the cold storage agent and enables continuous use, and also prevents freezing when the cold storage agent is frozen while cooling the inside of the refrigerator, that is, while operating the internal blower. To provide a cold storage type refrigerator that can save time.

Means for Solving the Problems In order to solve the above problems, the cold storage type cold storage box of the present invention divides the main body of the cold storage box into a cold storage chamber and a cold storage chamber, blows air inside the cold storage chamber in the same direction, and keeps the cold air inside the cold storage chamber cool. A first cooler is provided with an internal blower powered by a battery that circulates through the room, and has a defrosting heater inside the cold storage chamber, and a second cooler has a cold storage agent downstream of the first cooler. and a first refrigerator unit and a second refrigerator unit connected to each other, and when freezing the cold storage agent, the first and second refrigerator units are operated and stopped at the same time, and when defrosting, the first and second refrigerator units are operated and stopped simultaneously. This configuration has a configuration in which only the first refrigerator unit is stopped and the first cooler is defrosted.

Effect The present invention has the above-described configuration, so that even if the cold storage agent is frozen while cooling the cold storage compartment, that is, while operating the internal blower, the cold air flowing through the cold storage agent is cooled and dehumidified by the first cooler. Therefore, when the cold storage agent is frozen while cooling the cold storage room, the freezing time of the cold storage agent can be shortened. In addition, it is possible to prevent frost formation on the cold storage agent, and the frost on the first cooler can be defrosted without stopping the second refrigerator unit that freezes the cold storage agent, allowing continuous use for long periods of time. It can be done.

EXAMPLE Hereinafter, a cold storage type refrigerator according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the structure of a cold storage type cold storage box according to an embodiment of the present invention. 17 is the main body of the refrigerator, cabinet 18 with built-in insulation material and door 1
9 and a gasket 2o that seals the door 19 and the cabinet 18. Reference numeral 21 denotes a heat insulating partition wall containing a heat insulating material, which divides the inside of the cold storage main body 17 into two chambers, a cold storage chamber 22 and a cold storage chamber 23. The heat insulating partition wall 21 is provided with a cold air inlet 24 and a cold air outlet 26. 26
2 is an internal blower powered by a battery 27 that circulates the cold air in the cold storage chamber 23 through the cold storage chamber 22 as indicated by the solid line arrow, and is provided at the cold air discharge port 25. Reference numeral 28 denotes a first cooler provided in the cool storage chamber 23, and as shown in FIG. 2, it is composed of a fin coil having a ventilation passage A29. 3o
is a defrosting heater arranged in heat exchange manner with the first cooler 28. A drain port 31 is provided at the bottom of the first cooler 28. 32 is a second cooler provided on the downstream side of the first cooler 28, and as shown in FIG. 2, it is composed of a fin coil having a larger fin pitch FP and a larger pipe pitch PF than the first cooler 28. has been done. Reference numeral 33 denotes a latent heat type cold storage agent having a melting point approximately 10'C lower than the cold storage set temperature, and in this embodiment, a 27°C type cold storage agent is used. Cold storage agent 3
3 is inserted between each fin of the second cooler 32, and the cool storage agent 3 is inserted between each fin of the second cooler 32.
As shown in FIG. 3, 3 is a plastic container 33a with an uneven surface and a ventilation passage B34. 35
is a machine room in which a first refrigerator unit 36, a second refrigerator unit 37, and a battery 27 are housed. The first refrigerator unit 36 has a first compressor 38. The first condenser 39° is connected to the first capillary tube 4o and the first cooler 28 to form a refrigeration cycle. The second refrigerator unit 37 has a second compressor 41. Second condenser 4
2. Second capillary tube 43 and second cooler 32
is connected to form a refrigeration cycle. 44 is a condenser fan motor for the first condenser 39 and the second condenser 42.

45 is a freezing temperature controller that detects the temperature of the cold storage agent 33;
First refrigerator unit 36 and second refrigerator unit 37
The operating and stopping times of the refrigerant 33 are controlled, and the refrigerant 33 is heated to a predetermined freezing temperature (in this example, the temperature is 6°C lower than the melting temperature of the refrigerant 33).
℃). Reference numeral 46 denotes a cold storage temperature regulator that controls the operating and stopping times of the internal blower 26 and controls the temperature of the cold storage chamber 22 to a desired temperature (-18° C. in this embodiment). 47 is a changeover switch, and the changeover switch 47 can forcibly stop the refrigerator internal blower 26. 4
8 is a defrost controller, and when manually operated, the internal blower 26
Then, only the first refrigerator unit 36 is stopped, the defrost heater 30 is energized, the first cooler 28 is defrosted, the first cooler 28 rises to a predetermined temperature, and the defrosting ends. Then, it will automatically return to normal operation. 49 is a caster for movement. 50 is a power cord.

The operation of the cold storage type refrigerator constructed as described above will be explained below with reference to FIGS. 1 to 3.

First, a case will be described in which the cold storage agent 33 is frozen without cooling the inside of the cold storage chamber 22.

First, the power cord 50 is plugged into an AC 200V commercial power source to operate the first refrigerator unit 36 and the second refrigerator unit 3a. Then, by operating the changeover switch 47 and opening the switch circuit, the internal fan 26 is forcibly stopped. In this state, the first refrigerator unit 36 and the second refrigerator unit 37 are operated until the cool storage agent 33 freezes and the temperature drops to a predetermined temperature of -34°C. When the cool storage agent 33 reaches a predetermined temperature of -34°C, the freezing temperature controller 45 controls the operating and stopping times of the first refrigerator unit 36 and the second refrigerator unit 37 to maintain the predetermined freezing temperature. Control at -33±1°C.

At this time, if the internal blower 26 is forcibly stopped, the cool room 22
Since the refrigerator is not cooled, the refrigerating load on the first refrigerator unit 36 and the second refrigerator unit 37 is reduced, and the evaporation temperature becomes extremely low. Therefore, the cold storage agent 33 can be frozen in a short time.

Next, a case will be described in which the cold storage agent 33 is frozen while cooling the cold storage chamber 22. The power cord 6o is plugged into an AC 200V commercial power source to operate the first refrigerator unit 36 and the second refrigerator unit 37. And the changeover switch 47
is operated, the switch circuit is closed, and the operation/stop of the refrigerator air blower 26 can be controlled by the cold storage temperature controller 46. When connected to a commercial power source, the battery 27 is charged and the temperature of the cold storage compartment 22 is initially high, so the cold storage temperature controller 46 operates the refrigerator compartment blower 26 using the battery 27 as a power source. Cold air is circulated as shown by solid arrows to cool the cold storage chamber 22. When the cold storage chamber 22 is cooled down to an arbitrary temperature of 19° C., the cold storage temperature regulator 46 stops the internal blower 26. Thereafter, the cold storage temperature controller 46 controls the operating and stopping times of the internal blower 26 to control the temperature of the cold storage chamber 22' to 1-18±1°C.

First refrigerator unit 36 and second refrigerator unit 37
is operated until the cold storage agent 33 freezes and the temperature drops to a predetermined temperature of -34°C. When the cool storage agent 33 reaches a predetermined temperature of -34°C, the freezing temperature controller 46 controls the operating and stopping times of the first refrigerator unit 36 and the second refrigerator unit 37 to maintain the predetermined freezing temperature -34°C. Control at 33±1°C.

While the refrigerator fan 26 is in operation, air is blown as shown by the solid line arrow in Figure 1, but since it is cooled and dehumidified by the first cooler 28, the temperature of the cold air flowing into the second cooler 32 is lower than that of the cold storage. Since the melting temperature of the regenerator 33 is lower than the melting temperature of the regenerator 33, the surface of the regenerator 33 is less likely to be melted by the inflowing cold air, and the regenerator 33
The freezing time does not become significantly longer, and the cold storage agent 33 can be frozen in a relatively short time.

Next, we will discuss the case of refrigerated transport. power cord 5o
While connected to commercial power, the refrigerated cargo to be transported is placed in the cold storage compartment 22 to keep it cool, and just before transport, the power cord 5o is unplugged from the commercial power supply, and the refrigerated cargo is transported to the destination by means of transportation such as a truck. do. During refrigerated transport, the battery 27 that has been fully charged during freezing operation is used as a power source, and the refrigerant temperature regulator 46 controls the operating and stopping times of the internal blower 26, and the latent heat of fusion of the refrigerant 33 is used to cool the refrigerator. The cooled air is circulated as shown by the solid line arrows in Figure 1, and the cold storage chamber 22 is cooled and kept at an arbitrary temperature of -18±1°C, so that highly accurate cold storage performance can be maintained even during transportation.

Next, we will discuss the case of defrosting. Defrost power cord 6
If you manually operate the defrost controller 48 while the 300 is connected to commercial power, the first refrigerator unit 36 and the internal blower 26 will be forcibly stopped, and the defrost heater 3o will be energized. Then, the frost formed on the first cooler 28 is defrosted, and the defrosting water is discharged to the outside from the drain port 31. Since the drain port 31 is located at a lower position than the bottom of the second cooler 32,
The defrosting water will not flow to the second cooler 32 side and refreeze. Even during defrosting, the operation/stop of the second refrigerator unit 37 is controlled by the freezing temperature controller 45. Therefore, even when the first cooler 28 is defrosting, if the cold storage agent 33 is not frozen, the second refrigerator unit 37 is activated. Since the machine unit 37 is in operation, the first cooler 28 can be defrosted without stopping freezing of the cold storage agent 33.

Defrosting usually only needs to be carried out once a day, and if you decide on operating standards such as defrosting when refreezing after transportation, and carry it out regularly, you can defrost once every 2 to 3 days as in the past. It is possible to use it continuously for more than 10 days without having to stop using it and wash it with water to defrost it.

Although the amount of frost on the cold storage agent 33 is decreasing, if it is used for a long period of time, the amount of frost on the cold storage agent 33 will increase. It is necessary to defrost the cold storage agent 33 naturally or by washing with water.

As described above, according to the present embodiment, the heat insulating partition wall 21 having the cold air inlet 24 and the cold air outlet 26 can
The inside is divided into a cold storage chamber 22 and a cold storage chamber 23, and the inside of the cold storage chamber 23 is blown in the same direction, and the cold air inside the cold storage chamber 23 is sent to the cold air discharge port 26.
The cold air flows toward the cold storage chamber 22 side, and the cold air flows through the cold storage chamber 2 from the cold air intake port 24.
An internal blower 26 is provided which is powered by a battery 46 that circulates the air to the cold storage chamber 23. A first cooler 28 having a defrosting heater 30 is provided in the cold storage chamber 23, and a cold storage agent 33 is installed downstream of the first cooler 28. A second cooler 32 having a first cooler 2 is provided.
8, and the second refrigerator unit 37 and the first refrigerator unit 36, which are connected to the second cooler 32, are stopped. The cold storage chamber 22 is equipped with a defrost controller 48 that defrosts the cooler 28 and a freezing temperature regulator that controls the operation/stop of the first refrigerator unit 36 and the second refrigerator unit 37. Even if the cold storage agent 33 is frozen while being cooled, that is, while operating the internal blower 22, the cold air flowing through the cold storage agent 33 is cooled and dehumidified by the first cooler 28, so that the surface of the cold storage agent 33 is It is less likely to be melted by the inflowing cold air, and the freezing time of the cold storage agent 33 can be shortened compared to the conventional method. In addition, since the first cooler unit 36 is defrosted by stopping only the first refrigerator unit 36, the first cooler 28 can be defrosted without preventing the cold storage agent 33 from freezing. It is possible to use the agent 33 for a long period of time without increasing the freezing time.

Effects of the Invention As described above, the present invention has a heat insulating partition wall having a cold air intake port and a cold air discharge port at both ends that divide the inside of a cold storage box into a cold storage room and a cold storage room, and a heat insulating partition wall that has a cold air intake port and a cold air discharge port at both ends, and a cooling chamber that blows air in the same direction inside the cold storage room. an internal blower powered by a battery that circulates the cold air from the cold air discharge port to the cold storage chamber side and from the cold air intake port to the cold storage chamber; and a first cooler having a defrosting heater provided in the cold storage chamber; a second cooler having a cold storage agent provided downstream of the cooler; a first refrigerator unit and a second cooler connected to the first cooler to form a first refrigeration cycle; a second refrigerator unit that is connected to form a second refrigeration cycle; a defrost controller that stops only the first refrigerator and defrosts the first cooler; and the first refrigerator unit; By controlling the start and stop of the second refrigerator unit and the freezing temperature controller that controls the freezing temperature of the cold storage agent, even if the cold storage agent is frozen while cooling the cold storage room, it can be done in a short time. Since it is possible to freeze the cold storage agent and prevent frost formation on the cold storage agent, it can be used continuously for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing the structure of a cold storage type cold storage box according to an embodiment of the present invention, FIG. 2 is a cooling system layout diagram showing the configuration of the cooler and cold storage agent shown in FIG. 1, and FIG. Figure 2 is a side view, Figure 4 is a vertical cross-sectional view showing the structure of a conventional cold storage type refrigerator,
FIG. 5 is a perspective view showing the structure of the regenerator cooler shown in FIG. 4. 17...Cold box main body, 22...Cold storage chamber, 23...Cold storage chamber, 24...Cold air intake port, 26...Cold air Discharge port, 26...internal blower, 28...first cooler, 30...
... Defrost heater, 32 ... Second cooler, 3
3...Cold storage agent, 36...First refrigerator unit, 37...Second refrigerator unit. Name of agent: Patent attorney Shigetaka Awano and one other person
Hiro Kyuyu Wr-Gu ^! 17; $ Indoor storage hemorrhoids In-room exhaustion battery) 9-1 heater

Claims (1)

[Claims] A heat insulating partition wall with a cold air inlet and a cold air outlet at both ends divides the cold storage room into a cold storage room and a cold storage room, and the cold storage chamber is blown in the same direction so that the cold air in the cold storage chamber is sent to the cold storage room side through the cold air discharge port. An internal blower powered by a battery that circulates cold air from the cold storage inlet to the cold storage chamber, a first cooler with a defrosting heater installed inside the cold storage chamber, and a cold storage agent installed downstream of the first cooler. a second cooler unit having a second cooler connected to the first cooler to form a first refrigeration cycle; and a first refrigerator unit connected to the second cooler to form a second refrigeration cycle. A second refrigerator unit, a defrost controller that stops only the first refrigerator and defrosts the first cooler, and controls operation and stop of the first refrigerator unit and the second refrigerator unit. and a freezing temperature regulator for controlling the freezing temperature of the cold storage agent.