JPH0452478A - Cold storage type thermal insulation chamber - Google Patents

Abstract

PURPOSE:To reduce frosting of a cold storage agent and to enable continuous use by having a cold storage unit arranged to be thermally exchanged with a second cooler and a freezer unit outside the cold, storage chamber composing first and second coolers connected to the unit to form a refrigerating cycle, a freezing temperature controller for controlling operation and stop of an interior blower, and changeover switch. CONSTITUTION:When an indoor blower 26 is operated by battery 27 as a power source and a thermal insulation chamber 33 is cooled to an arbitrary temperature, a thermal insulation temperature control thermostat 42 is opened to stop the blower 26. Then, the blower 26 is operated and stopped by the thermostat 42 to control a thermal insulation chamber 22 to an arbitrary temperature. A compressor 36, a condenser fan motor 35 are continuously operated until a cold storage agent 32 is completely frozen and a cold storage temperature control thermostat 40 is opened. Even if the agent 32 is frozen while the blower 26 is being operated, after the temperature of chilled gas circulated by a cooler 28 is cooled to be dehumidified to a temperature lower than the melting point of the agent 32, the gas is circulated to a cold storage unit 34 arranged to be thermally exchanged with a second cooler 30. Thus, frosting on the surface of the agent 32 can be prevented, and freezing of the agent 32 can be accelerated.

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 is placed in the refrigerator air blower so as to blow air in a direction parallel to the plate surface of the cold storage plate 6 of the regenerator cooler 5, thereby directing the air in the refrigerator interior 1o through the regenerator cooler 6 in the direction indicated by the solid line arrow. It is circulated in a similar manner.

11 is a refrigerator unit main body, and a 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 the condenser fan motor, and 15 is the caster. This cold storage type cold storage warehouse uses commercial power to supply the cold storage agent 8 in the cold storage type cooler 5 in a place where there is a commercial power supply.
The coolant is stored by the evaporation of the refrigerant in the refrigerant evaporation tube, and when there is no commercial power such as during transportation, the internal blower 9 is operated by the power from the built-in battery (not shown), and the coolant 8 is stored. The interior 10 of the refrigerator is cooled and kept cold using latent heat of fusion.

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 formed on the outer surface of the cold storage plate 6 will increase, causing damage to the cold storage plate. The gap between the cold storage plates is blocked by frost and the cold storage capacity is significantly reduced, so it is necessary to stop the cold storage once every two to three days and defrost it by washing with water, making it impossible to use it continuously.

In view of the above-mentioned problems, the present invention provides a cold storage type refrigerator which reduces frost formation on the cold storage agent and can be used continuously.

Means for Solving the Problems In order to solve the above problems, the cold storage type refrigerator of the present invention divides the main body of the refrigerator into a cold storage chamber and a cold storage chamber, and uses a battery as a power source to circulate cold air in the cold storage chamber through the cold storage chamber. A first cooler having a ventilation passage is provided in the cold storage chamber, a second cooler is provided downstream of the first cooler, and the second cooler has a ventilation passage. The cooling storage unit is provided with a cold storage unit in which the cold storage agents are arranged so that the second cooler and the cold storage agents are disposed in a heat exchange manner.

Function The present invention cools the cold storage chamber with the above-described configuration, while
In other words, even if the cold storage unit is frozen while the internal blower is running, the cold air flowing into the cold storage unit is cooled and dehumidified by the first cooler, which prevents frost from forming on the cold storage agent, so continuous use is possible. In addition, even if the cold storage agent is frozen while cooling the cold storage room, the cold storage agent can be frozen in a short time.

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, and cabinet 18 has a built-in insulation material.
, a door 19 , and a gasket 20 for sealing 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 25.

Reference numeral 26 denotes an internal blower powered by a battery 27, which circulates the cold air in the cold storage chamber through the cold storage chamber 22 as indicated by the solid line arrow, and is provided at the cold air discharge port 26. 28 is cold storage chamber 2
As shown in Fig. 2, the first cooler installed in the ventilation passage A
It consists of a fin coil with 29. A drain port 44 is provided on the 6th side of the first cooler 28 f). 30
is a second cooler provided downstream of the first cooler,
It is composed of a fin coil as shown in FIG. 2, and is arranged at a higher position than the first cooler 28.

The first cooler 29 and the second cooler 30 are connected to the refrigerant evaporation tube 31
It is connected at 32 is 10 to 1 higher than the cold storage setting temperature.
A latent heat type cold storage agent having a melting point as low as 5.5 degrees Celsius (-10'C in this example) is arranged alternately between the fins of the second cooler 30, and the second cooling is performed while ensuring the ventilation path B33. The cold storage unit 34 is arranged in a heat exchange manner with the heat exchanger 30 to form a cold storage unit 34. 36 is a refrigerator unit main body, and a compressor 36. Contains a condenser 37 and a capillary tube (not shown),
It is connected to the first cooler 28 and the second cooler 3o to form a refrigeration cycle. 38 is a condenser fan motor. FIG. 3 shows an electrical circuit diagram of the cold storage type refrigerator according to the embodiment of the present invention described above. In Figure 3, 3
9 is a commercial power supply; 4o is a cold storage temperature control thermostat that detects the temperature of the cold storage agent 32;
compressor 36. Operation of condenser fan motor 35
The stopping time is controlled and the freezing temperature of the cold storage agent 32 is kept at a predetermined temperature (in this example, 10°C lower than the melting temperature - 20'C).
It is intended to be controlled. A battery charger 41 charges the battery 27 when connected to the commercial power source 39. Reference numeral 42 denotes a thermostat for controlling cold storage temperature, which controls the operation/stop of the internal blower 26 and controls the temperature of the cold storage chamber 22 to a desired temperature (5° C. in this embodiment). Reference numeral 43 denotes a changeover switch, and by operating the changeover switch 43, the refrigerator internal blower 26 can be forcibly stopped regardless of the cold storage temperature control thermostat.

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 32 is frozen without cooling the inside of the refrigerator. The switching switch 43 is switched to the open side, and the commercial power source 39 is energized. Initially, the temperature of the cold storage agent 32 is high, so the cold storage temperature control thermostat 4o is opened and the compressor 36. The condenser fan motor 35 is operated, and the first cooler 28 and the second cooler 3o are cooled to lower the temperature of the cold storage chamber 23 and freeze the cold storage agent 32. After the cold storage agent 32 is frozen, it is controlled to an arbitrary freezing temperature by a cold storage temperature control thermostat 40. Also, commercial power supply 3
While battery 9 is energized, the battery charger 41
7 is charged, but the internal blower 26 does not operate because the switching switch 43 is forcibly opened.

When the internal blower 26 is forcibly stopped, the cold storage chamber 22 is not cooled, so the refrigeration load on the compressor 36 is reduced and the evaporation temperature becomes very low. Therefore, the cold storage agent 23 can be frozen in a short time. If you want to keep the cold storage chamber 22 cool during transportation, you can manually or automatically close the changeover switch when the cold storage agent 23 is completely frozen, and the cold storage chamber 22 will be cooled. The cold storage chamber 22 can also be cooled to an arbitrary temperature. Next, a case will be described in which the cold storage agent 32 is frozen while cooling the cold storage chamber 22. The changeover switch 43 is switched to the closed circuit side, and the commercial power supply 39 is energized.

Initially, the temperature of the cold storage agent 32 is high, so the cold storage temperature control thermostat 40 is closed, the compressor 36° condenser fan motor 36 is operated, and the first cooler 28 and the second cooler 30 are cooled. Ru. Further, while the commercial power supply 39 is energized, the battery 27 is charged by the battery charger 41.

And since the changeover switch 43 is forcibly closed,
The internal blower 26 is operated using the battery 27 as a power source, and cool air is circulated to cool the cold storage compartment 22 as shown by the solid line in FIG. When the cold storage chamber 22 is cooled to an arbitrary temperature, the cold storage temperature control thermostat 42 is opened and the internal blower 26 is stopped. Thereafter, the cold storage temperature control thermostat 42 is used to operate and stop the internal blower 26 in the cold storage room 22.
to any desired temperature. Furthermore, compressor 36. The condenser fan motor 35 is continuously operated until the cold storage agent 32 is completely frozen and the cold storage temperature control thermostat 40 is opened.

After the cold storage agent 32 is completely frozen, the compressor 36. Condenser fan motor 3
6 is operated and stopped to control the temperature of the cool storage agent 32 to a desired temperature. When the cold storage temperature control thermostat 42 is closed while the cold storage temperature control thermostat 40 is open, the refrigerator internal blower 26 is operated and the temperature of the frozen cold storage agent 32 rises. Since the temperature is about 10℃ lower than the freezing point, cold storage agent 3 is different from the latent heat change part.
2 rises in a short time and the cold storage temperature control thermostat 4o is closed, so the compressor 36 and condenser fan motor 36 are operated. Therefore, even if the cold storage agent 32 is frozen while cooling the cold storage compartment 22, that is, while operating the internal blower 26, the temperature of the cold air circulated by the first cooler 28 will be lower than the melting point of the cold storage agent 32. After being cooled and dehumidified, the cold storage unit 3 is arranged in a heat exchange manner with the second cooler 3o.
4, it is possible to prevent frost from forming on the surface of the cold storage agent 320 and to promote freezing of the cold storage agent 32.
Even if the operation is performed while cooling the cold storage chamber 22, the freezing time of the cold storage agent 32 is not significantly increased, and the cold storage agent 32 can be frozen in a short time.

Next, we will discuss the case of refrigerated transport.

When the power supply to the commercial power source 39 is stopped, the operation of the compressor 36 and the condenser fan motor 35 is stopped, and the charging of the battery 27 by the battery charger 41 is also stopped. After the power supply to the commercial power source 39 is stopped, the thermostat 42 for cooling temperature control uses the battery 27 as a power source.
controls the operation/stop of the internal blower 26, and cool storage agent 3
The cold air cooled by the latent heat of fusion of 2 is blown into the cold storage room,
The cold storage chamber 22 is cooled and kept cold at an arbitrary temperature. In this state, it is placed on a transport means such as a truck and transported to the destination in a refrigerated manner.

During refrigerated transportation, the first cooler 28 is not cooled, so the frost attached to the first cooler 28 is thawed by the intake air circulated from the cold storage chamber 22 and flows to the second cooler 3o. It is discharged to the outside of the cold storage main body 17 from the drain port 44.

Therefore, even if the first cooler 28 is used continuously, the amount of frost that adheres to the first cooler 28 during freezing operation does not increase significantly, and it is possible to use the first cooler 28 continuously for a long period of time.

Although this embodiment has been described for the case of refrigerated cold storage, when the cold air in the cold storage chamber 22 cannot be used as a defrosting heat source for the first cooler during cold storage operation, such as when storing cold at -18°C, the first
By providing a defrosting means in the cooler 28 and periodically defrosting only the first cold mold 28 during freezing operation, it is possible to prevent frost formation on the cold storage agent 32 and achieve the same effect that can be used continuously. Obtainable. If the cold storage chamber 22 is to be used continuously for a very long period of time, a sealed duct that communicates the cold air intake port 24 and the cold air discharge port 25 may be provided on the side of the cold storage chamber 22, and the cold storage chamber 22 may be cooled through the sealed duct. It is also possible to use it continuously for a very long time.

As described above, according to this embodiment, the inside of the cold storage main body 17 is divided into the cold storage chamber 22 and the cold storage chamber 23 by the heat insulating partition wall 21 having the cold air intake port 24 and the cold air discharge port 25, and the cold air inside the cold storage chamber 23 is divided into the cold storage chamber 22 and the cold storage chamber 23. An internal blower 26 that is powered by a battery 27 that circulates to the cold storage chamber 23 via the cold storage chamber 22 side is installed in the cold storage chamber 2.
3, a first cooler 28 having a ventilation passage A29 is provided,
A second cooler 3o is provided downstream of the first cooler 2,
A cold storage agent 32 is provided in the second cooler 3o so as to have a ventilation path B33, and a cold storage unit 34 is provided in which the second cooler 3o and the cold storage agent 32 are arranged for heat exchange. Even if the cold storage agent 32 is frozen while cooling the chamber 22, the cold air flowing into the cold storage unit 34 is transferred to the first cooler 2.
Since cooling and dehumidification are performed at step 8, frost formation on the cold storage agent 32 can be prevented, and the freezing time on the cold storage agent 32 can be significantly shortened compared to the conventional method. In addition, the frost that has adhered to the first cooler 28 is defrosted by the cold air at a positive temperature in the cold storage chamber 22 and is discharged outside the cold storage main body 17 from the drain port 44, so that the circulation amount of the internal fan 26 is reduced due to frost formation. It can be used continuously for a long period of time since it can be prevented from decreasing significantly.

Effect of the invention.

As described above, the present invention has a heat insulating partition wall that divides a cold storage chamber into a cold storage chamber and a cold storage chamber, and has a cold air intake port and a cold air discharge port at both ends, and blows air inside the cold storage chamber in the same direction. An internal blower powered by a battery that causes cold air to flow from the outlet to the cold storage chamber and circulate from the cold air intake to the cold storage chamber;
A first cooler having a ventilation passage A provided in a cold storage chamber, a second cooler provided on the downstream side of the first cooler, and a cold storage agent having a ventilation passage B in the second cooler. a refrigerating machine which is connected to the first cooler and the second cooler and forms a refrigeration cycle, which is provided outside the cold storage room; Equipped with a freezing temperature controller that detects the temperature of the unit cold compartment and controls the operation/stop of the internal fan, and a switch that forcibly stops the internal fan, the cold storage agent can be used while cooling the cold compartment. Even when frozen, the cold storage agent can be frozen in a short period of time, and frost formation on the cold storage agent can be prevented, so it can be used continuously for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the structure of a cold storage type refrigerator according to an embodiment of the present invention, FIG. 2 is a structural diagram showing the cooler and cold storage agent of FIG. 1, and FIG. 3 is an embodiment of the present invention. FIG. 4 is a longitudinal cross-sectional view showing the structure of a conventional cold storage type refrigerator, and FIG. 6 is a perspective view showing the structure of the cold storage type cooler shown in FIG. 4. 17...Cold box main body, 22...Cold storage chamber, 23...Cold storage chamber, 24...Cold air intake port, 25...Cold air Discharge port, 26...internal blower, 28...first cooler, 3o...
...Second cooler, 32...Cold storage agent, 35.
... Refrigerator unit. Name of agent: Patent attorney Shigetaka Awano and 1 other person6
--f noodle feed haze 1 fraud (27-battery 43-tυ road switch Fig. 17- maintenance;

Claims (1)

[Claims] A heat insulating partition wall has a cold air intake port and a cold air discharge port at both ends that divide the inside of the cold storage compartment into a cold storage room and a cold storage room, and a wall that blows air in the same direction inside the cold storage compartment and directs the cold air from the cold air discharge port toward the cold storage room. 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 ventilation path A installed inside the cold storage chamber, and a first cooler installed downstream of the first cooler. a second cooler, a cold storage unit arranged to exchange heat with the second cooler by arranging the cold storage agent so that the second cooler has a ventilation path B, and a cold storage unit provided outside the cold storage room. A refrigerator unit that connects with a first cooler and a second cooler to form a refrigeration cycle, a freezing temperature controller that detects the temperature of the cold storage room and controls the operation/stopping of the internal blower, and the inside of the refrigerator. A cold storage type refrigerator characterized by being equipped with a changeover switch that forcibly stops the blower.