JPH1047837A - Freezing container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently carry out a defrosting operation and obtain frozen goods free from degradation of quality by preventing temperature-elevated air in a suction chamber where an evaporator is stored from entering a refrigerator during a defrosting operation. SOLUTION: In a freezing container, a deep freezer 1 in which a refrigerator 51 is arranged is provided with a suction chamber 15 where an evaporator 10 and heating means for defrosting the evaporator 10 are disposed. In an air suction passage which connects the deep freezer 51 with the suction chamber 15, a curtain 60 which allows only an air flow in a direction from the deep freezer 51 to the suction chamber 15 is provided. During a defrosting operation, the curtain 60 is closed so as to prevent the hot air from entering a freezing chamber from the suction chamber 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an air suction device for a refrigeration unit in a refrigeration container.

[0002]

2. Description of the Related Art FIG. 2 is a front view of a refrigeration unit mounted on a refrigeration container. 3 and 4
3 is a structural view of the refrigeration unit provided with a conventional air suction device, FIG. 3 is a sectional view taken along line BB of FIG. 2, and FIG.
It is CC sectional drawing of.

1 to 3, reference numeral 1 denotes a container, and a refrigeration unit 10 is provided on one end wall 2 of the container 1.
No. 0 is assembled, and freezing cargo 50 is stored in the container 1 from a door (not shown) provided on the other end wall.
The refrigeration container operates the refrigeration unit 100 to reduce the internal temperature of the container 1 by -3.
The container 1 is mounted on a ship, a truck, a railcar or the like and transported while maintaining a temperature arbitrarily set within a range of 0 ° C. to + 25 ° C.

[0004] During the operation of the refrigeration unit 100, the gas refrigerant discharged from the compressor 3 enters the air-cooled condenser 4, where it is condensed and liquefied. This liquid refrigerant enters the expansion valve 9 via the dryer 7 and the strainer 8, and is throttled here to adiabatically expand to become a gas-liquid two-phase refrigerant. This refrigerant enters the evaporator 10, where the refrigerant is vaporized by cooling the inside air sent by the evaporator fan 12, and then returns to the compressor 3 via the accumulator 13.

On the other hand, the air inside the container 1 is shown in FIGS.
As shown by a solid arrow in FIG. 4, the air enters the suction chamber 15 through the air suction port 14, and is urged by the evaporator fan 12 driven by the motor 11.
After being cooled by the refrigerant in the process of flowing
6. Return to the inside of the container 1 via the blowing chamber 18.

The outside air is heated by exchanging heat with a gas refrigerant in the process of flowing through the condenser 4 as shown by a broken line arrow in FIG. And released into the atmosphere. The drain condensed on the evaporator 10 drops on the drain pan 22 and is discharged from the drain port 24 through the drain pipe 23 to the outside.

25 is a control box, 26 is a liquid injection solenoid valve for injecting and cooling a liquid refrigerant into the compressor 3, 27 is a 200 V class power plug, 28 is a 400 V class power plug, 29 is a power source A transformer 31 is a suction air temperature sensor for detecting the temperature of the air in the refrigerator sucked into the evaporator 10, a reference numeral 30 is an insertion port of a thermometer for checking the temperature sensor 31, and a reference numeral 33 is a sensor for the air blown out from the evaporator 10. An outlet air temperature sensor 32 for detecting the temperature is an insertion port of the check thermometer of the temperature sensor 33.

An outlet temperature sensor 34 detects the refrigerant temperature at the outlet of the evaporator 10, an overheat prevention sensor 35, a discharge pipe temperature sensor 36 detects the gas refrigerant temperature at the outlet of the compressor 3, and 37. Is an outside air temperature sensor for detecting the temperature of the outside air flowing into the air-cooled condenser 4, 38 is an inspection lid for inspecting equipment in the suction chamber 15, 39 is a handle used for attaching and detaching the inspection lid 38,
40 is a ventilation device.

Reference numeral 41 denotes a partition wall for partitioning the inside and outside of the container 1. The partition wall 41 is fastened to the end wall 2 of the container 1 by a flange 44 formed all around the partition wall. A recess 42 is formed in the center of the lower portion on the outside of the partition wall 41, and the compressor 3, the air-cooled condenser 4, the condenser fan 6 and the like are installed inside the recess 42. The suction chamber 15 is provided inside the partition wall 41 and above the recess 42, and the air passages 1 are provided on both sides.
The blowout chambers 6 are formed below the recesses 42, respectively. The suction chamber 15 is separated from the inside of the freezer by a partition plate 45, and the evaporator 10, the evaporator fan 12, the motor 11, and the like are installed in the suction chamber 15.

When the refrigeration unit 100 is operated for a long time and frost is formed on the evaporator 10,
Even if the evaporator fan 12 rotates, air in the refrigerator does not pass through the evaporator 10 and the refrigeration unit 10
The ability of 0 becomes 0. Further, in this state, since the refrigerant in the evaporator 10 does not exchange heat, it returns to the compressor 3 via the accumulator 13 without being gasified, so that the compressor 3 is liable to burn or break.

In order to prevent such a problem from occurring, the refrigeration unit 100 sends an electric signal to the control box 25 when the temperature of a fan thermostat (not shown) attached to the evaporator 10 falls below 0 ° C. , The evaporator fan 12 and the condenser fan 6 are stopped, and the defrost heater 55 provided below the evaporator 10 is energized to remove the frost. When the temperature of the evaporator 10 rises due to the melting of the frost, the temperature of the fan thermometer is detected, the defrost heater 55 is stopped, and the freezing operation is started again.

[0012]

In the conventional refrigeration container described above, the compressor 3, the evaporator fan 12 and the condenser fan 6 are stopped and the defrost heater 55 is energized during the defrost operation of the refrigeration unit 100, so that the evaporator is operated. The frost adhering to 10 is removed.

At this time, the air heated by the defrost heater 55 rises after the frost of the evaporator 10 is melted, flows out to the cargo 50 in the freezer 51, and melts the cargo 50 in the upper part of the container. Therefore, the quality of the cargo may be reduced. Further, in the refrigeration unit, since the heat of the defrost heater 55 flows out toward the cargo 50 in the freezer 51 as described above, there is also a problem that it is not effectively used for defrosting the evaporator 10. .

[0014] It is an object of the present invention to prevent dewarming of the evaporator while effectively preventing defrosting of the evaporator by preventing the heated air in the suction chamber in which the evaporator is housed from entering the freezer during the defrost operation. There is no refrigeration to get.

[0015]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its gist is to provide an evaporator and a defrosting device for the evaporator in a suction chamber formed in a container provided with a freezer. And a curtain that allows only an air flow from the freezer to the suction chamber in an air suction passage connected from the freezer to the suction chamber.

According to the above means, during the defrost operation of the refrigeration unit provided with the evaporator, when the fan for the evaporator stops and there is no airflow from the freezer to the suction chamber provided with the evaporator, the curtain is opened. When closed, the suction chamber provided with the evaporator and the freezer are isolated from each other, so that the hot air warmed by the heating means fills around the evaporator and is effectively used for defrosting.

Further, since the curtain closes the air suction passage, it is possible to prevent a situation in which the exhaust gas in the suction chamber enters the freezer and melts a part of the refrigerated cargo on the upper side.

During the freezing operation, the curtain is opened by operating the evaporator fan, so that air smoothly flows from the freezer side into the suction chamber.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 2 is a front view of a refrigeration unit provided in the refrigeration container.
FIG. 1 is a BB cross-sectional view of FIG. 2 showing the periphery of the air suction device of the refrigeration unit according to the embodiment of the present invention.

1 and 2, reference numeral 1 denotes a container, 100
Is a refrigeration unit installed in the container 1. 4
Reference numeral 1 denotes a partition wall that separates the inside and outside of the container 1 and is fastened to the end wall 2 of the container 1 by a flange 44 formed on the entire periphery thereof. A recess 42 is formed in the center of the lower portion outside the partition wall 41, and a compressor 3, an air-cooled condenser 4, a condenser fan 6, a driving motor 17 and the like are installed inside the recess 42. The suction chamber 15 is formed inside the partition wall 41 and above the recess 42, the air passage 16 is formed on both sides, and the blowout chamber 18 is formed below the recess 42. In addition, the suction chamber 1
5 is partitioned from the inside of the freezer 51 by a partition plate 45, and the suction chamber 15 is equipped with an evaporator 10, an evaporator fan 12, a driving motor 11, a defrost heater 55, and the like.

Reference numeral 25 denotes a control box; 26, a solenoid valve for liquid injection for injecting and cooling a liquid refrigerant into the compressor 3; 27, a plug for a 200V class power supply; 28, a plug for a 400V class power supply; A transformer 31 is a suction air temperature sensor for detecting the temperature of the air in the refrigerator sucked into the evaporator 10, a reference numeral 30 is an insertion port of a thermometer for checking the temperature sensor 31, and a reference numeral 33 is a sensor for the air blown out from the evaporator 10. An outlet air temperature sensor 32 for detecting the temperature is an insertion port of the check thermometer of the temperature sensor 33.

An outlet temperature sensor 34 detects the refrigerant temperature at the outlet of the evaporator 10, an overheat prevention sensor 35, a discharge pipe temperature sensor 36 detects the gas refrigerant temperature at the outlet of the compressor 3, and 37. Is an outside air temperature sensor for detecting the temperature of the outside air flowing into the air-cooled condenser 4, 38 is an inspection lid for inspecting equipment in the suction chamber 15, 39 is a handle used for attaching and detaching the inspection lid 38,
40 is a ventilation device.

The above configuration is the same as the conventional one shown in FIGS.

A curtain 60 is provided at the air inlet 14 of the refrigeration unit 100 and opens and closes the air inlet 14.

The curtain 60 is formed in the shape of a reed valve made of a thin plate made of an elastic material. The air suction port 14 is opened by a pressure difference between the freezer 51 and the suction chamber 15. Is opened when the pressure of the suction chamber 15 is higher than the pressure of the suction chamber 15 side.
Only the airflow to the 5 side is allowed.

The refrigeration unit 10 configured as described above
When the operation is 0, the gas refrigerant discharged from the compressor 3 enters the air-cooled condenser 4, where it is condensed and liquefied. This liquid refrigerant enters the expansion valve 9 via the dryer 7 and the strainer 8, and is throttled here to adiabatically expand to become a gas-liquid two-phase refrigerant. This refrigerant is the evaporator 10
Then, after the inside air sent by the evaporator fan 12 is cooled and vaporized, the air returns to the compressor 3 via the accumulator 13.

On the other hand, the air inside the container 1 is shown in FIGS.
As shown by a solid line arrow in FIG. 2, the air enters the suction chamber 15 through the air suction port 14, is urged by the evaporator fan 12 driven by the motor 11, and
After being cooled by the refrigerant in the process of flowing
6. Return to the inside of the container 1 via the blowing chamber 18. The outside air is supplied to the condenser 4 as shown by a broken line arrow in FIG.
Is heated by exchanging heat with the gas refrigerant in the process of flowing through the condenser fan 6, and then driven by the motor 17.
And released into the atmosphere. The drain condensed on the evaporator 10 drops on the drain pan 22,
It is discharged from the drain port 24 to the outside through the drain pipe 23.

During operation of the refrigeration unit 100, when the evaporator fan 12 rotates and the evaporator 10 is operating normally without frost, the freezer 5 of the container 1
The air in the air suction port 1 is sucked by the fan 12 and
4, the curtain 60 is pushed open and flows to the evaporator 10.

When the evaporator 10 is frosted, a defrost operation is started by an electric signal from a fin thermostat (not shown) of the evaporator 10. During the defrost operation, the compressor 3, the evaporator fan 12, and the condenser fan 6 are stopped, and the defrost heater 55 is energized. At this time, since the evaporator fan 12 is stopped, no air flows, and the curtain 60 is closed by its elastic restoring force. The tip of the curtain 60 contacts the partition plate 45 and cannot be opened inside the freezer 51.

When the curtain 60 is closed, that is, during the defrost operation, the hot air in the suction chamber 15 heated by the electric heater 55 warms the evaporator 10 in the suction chamber 15 partitioned by the curtain 60 without waste and defrosts. Let it. During the defrost operation, the air in the suction chamber 15 warmed by the defrost heater 22 as described above is blocked by the curtain 60 and is prevented from flowing into the freezer 51.
The occurrence of a situation where 0 is melted is avoided.

[0031]

The present invention is configured as described above.
According to the present invention, during the defrost operation, the curtain closes to separate the suction chamber in which the evaporator is stored from the inside of the freezer, so that the hot air in the suction chamber warmed by the heating means does not enter the freezer. It is used for defrosting the evaporator. Thereby, defrosting is efficiently performed, and it is possible to prevent a situation in which the hot air enters the freezer and warms a part of the refrigerated cargo in the freezer to lower the quality. In the normal operation after the defrost operation, since the curtain is opened by the intake air of the evaporator fan, a smooth freezing operation is maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a refrigeration unit for a refrigeration container according to an embodiment of the present invention (a BB sectional view in FIG. 2).

FIG. 2 is a front view showing an arrangement of a container refrigeration unit.

FIG. 3 is a drawing corresponding to FIG. 1 showing a conventional refrigeration unit.

FIG. 4 is a sectional view taken along line CC of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 End wall 3 Compressor 4 Condenser 6 Condenser fan 10 Evaporator 12 Evaporator fan 14 Air suction port 15 Suction chamber 18 Blow-out chamber 41 Partition wall 45 Partition plate 51 Freezer 55 Defrost heater 60 Curtain 100 Refrigeration unit

Claims (1)

[Claims] 1. A refrigerating container comprising an evaporator and a heating means for defrosting the evaporator in a suction chamber formed in a container in which the freezer is provided, and connected to the suction chamber from the freezer. A refrigeration container, characterized in that a curtain is provided in the air suction passage so as to allow only an air flow from the freezing chamber to the suction chamber.