JPH0658652A - Freezing unit for container - Google Patents

Abstract

PURPOSE:To prevent liquid refrigerant from being accumulated within a compressor, or restrict it from being stored in the compressor when a freezer device is stopped for a long period of time by a method wherein a suction pipe for connecting an accumulator to the compressor is arranged to pass within a container and a part of the suction pipe within the container is provided with a refrigerant liquid accumulator. CONSTITUTION:A suction pipe 45 connecting an accumulator 13 to a compressor 3 sealingly passes through a partition wall 41 and further passes through within a container 1. A part of the suction pipe 45 within the container 1 is bent to form a refrigerant liquid accumulator 46. During a long period stopping of a freezer device, a temperature of the refrigerant liquid accumulator 46 is kept at a lower temperature than that of the accumulator 13 or the compressor 3. Accordingly, gaseous refrigerant sealingly stored in a refrigerant circuit becomes liquid refrigerant and is stored within the refrigerant liquid accumulator 46 during a moving of it from the accumulator 13 to the compressor 3 through the suction pipe 45, so that it is possible to prevent or restrict the refrigerant from being accumulated within the compressor 3.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a refrigerating unit for a container.

[0002]

2. Description of the Related Art A conventional container is shown in FIG.
The container 1 has a rectangular parallelepiped shape, and a refrigeration unit 100 is attached to one end wall 2 of the container 1. By storing the cargo in the container 1 through a door (not shown) provided on the other end wall of the container 1 and operating the refrigeration unit 100, the air temperature inside the container 1 is kept within the range of -25 ° C to + 25 ° C. The container 1 is carried on a vessel, a truck, a railroad vehicle, etc., while being maintained at a temperature arbitrarily set by.

A schematic structure of the refrigerating unit 100 is shown in FIG. It is sectional drawing which follows CC arrow. The gas refrigerant discharged from the compressor 3 enters the water cooling condenser 5 or the air cooling condenser 4 and is condensed and liquefied there. The liquid refrigerant enters the electronic expansion valve 9 through the dryer 7 and the strainer 8 and is throttled there to undergo adiabatic expansion to become a gas-liquid two-phase refrigerant. This refrigerant enters the evaporator 10, where it evaporates and vaporizes by cooling the air in the refrigerator blown from the evaporator fan 12 driven by the motor 11. Then, this gas refrigerant returns to the compressor 3 via the accumulator 13.

As shown by the solid arrow, the air in the container 1 enters the evaporator section 15 from the suction port 14 and is urged by the evaporator fan 12, and is cooled in the process of passing through the evaporator 10. Wind path 16, blowout room
It returns to the inside of the container 1 via 18 and is blown out from the gap of many T rails 43.

When the air-cooled condenser 4 is used, the motor
The condenser fan 6 is driven by 17. Then, after the temperature of the outside air is increased by exchanging heat with the gas refrigerant in the process of passing through the air-cooled condenser 4, as indicated by the dashed arrow,
The capacitor fan 6 is energized and discharged.

When using the water-cooled condenser 5, a water supply valve and a drain pipe (not shown) are connected to the cooling water inlet 19 and the cooling water outlet 20 to open the water control valve 21. Then, the cooling water supplied from the water supply pipe enters the water cooling condenser 5 through the water pipe (not shown) from the cooling water inlet 19 and heats up there by exchanging heat with the gas refrigerant. The water is discharged from the cooling water outlet 20 through the water valve 21 and the drain pipe.

The drain condensed on the evaporator 10 is dropped on the drain pan 22 and is passed through the drain hose 23 to the drain port.
Emitted from 24.

Reference numeral 41 denotes an inner and outer partition wall made of a heat insulating material, which is fastened to the end wall 2 of the container 1 by a flange formed on the entire circumference thereof. A condenser section 42 is formed on the outside of the partition wall 41 in the center of the lower portion thereof, and an evaporator section is formed on the upper side of the condenser section 42 inside the partition wall 41.
15, an air passage 16 is formed on both sides, and an outlet chamber 18 is formed in the lower portion. An evaporator 10, an evaporator fan 12, etc. are installed in the evaporator section 15. Inside the condenser section 42 are a compressor 3, an air-cooled condenser 4, a condenser fan 6 and an accumulator.
13 mag is installed.

Reference numeral 25 is a control box, 26 is a solenoid valve for liquid injection for injecting and cooling a liquid refrigerant into the compressor 3, 27 is a 200V class power plug,
28 is a 400V class power supply plug, 29 is a power transformer, 31 is an intake air temperature sensor for detecting the temperature of the air in the refrigerator that is sucked into the evaporator 10, 30 is an insertion port of a thermometer for checking the temperature sensor 31, 33 is a blown air temperature sensor for detecting the temperature of the air blown from the evaporator 10, 32 is an insertion port of a thermometer for checking the temperature sensor 33, and 34 is an outlet for detecting the refrigerant outlet temperature of the evaporator 10. A temperature sensor, 35 is an overheat prevention sensor, 36 is a discharge pipe temperature sensor for detecting the temperature of the discharge pipe of the compressor 3, 37 is an outside air temperature sensor for detecting the temperature of the outside air flowing into the air cooling condenser 4, and 38 is An inspection lid for inspecting the equipment in the evaporator section 15, 39 is a handle for attaching and detaching the inspection lid 38, and 40 is a ventilation device.

[0010]

When the conventional refrigeration system is stopped for a long period of time, the gas refrigerant enclosed in the refrigerant circuit may gradually liquefy and accumulate in the accumulator 13 and the compressor 3 in a large amount. there were. If the compressor 3 is started in this state, the compressor 3 may cause a so-called liquid compression phenomenon and the compressor 3 may be destroyed.

[0011]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above-mentioned problems, and its gist is to provide an evaporator section through which air in a container flows and outside air. The condenser section to be used is partitioned by the inner and outer partition walls, and the evaporator section is attached to the evaporator section.
In a container refrigeration unit in which a compressor, a condenser, an accumulator, etc. are disposed in the condenser section, a suction pipe connecting the accumulator and the compressor is passed through the container. A refrigerating unit for a container, characterized in that a refrigerant liquid reservoir is provided in a portion of the suction pipe inside the container.

[0012]

In the present invention, because of the above structure, the gas refrigerant accumulates when the refrigeration system is stopped for a long period of time.
On the way from the compressor to the compressor through the suction pipe, it is liquefied in the refrigerant liquid pool and accumulates in it.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of the present invention is shown in FIG. Suction pipe connecting accumulator 13 and compressor 3
The reference numeral 45 tightly penetrates the partition wall 41 and is piped through the inside of the container 1. And the container 1 of this suction pipe 45
Refrigerant liquid pool 46 is formed by bending the inner portion. Reference numeral 47 is a discharge pipe of the compressor 3, and 48 is a suction pipe of the accumulator 13. Other configurations are shown in FIGS.
It is similar to the conventional one shown in.

However, if the refrigeration system is stopped for a long period of time,
Although the air temperature inside the container gradually rises and approaches the outside air temperature, the temperature of the refrigerant liquid pool 46 is maintained at a temperature lower than the accumulator 13 and the compressor 3 because the temperature of the air inside the container changes gradually. Therefore, the gas refrigerant enclosed in the refrigerant circuit is liquefied and accumulated in the refrigerant liquid reservoir 46 as a liquid refrigerant while moving from the accumulator 13 to the compressor 3 through the suction pipe 45, and thus the compressor 3 It is possible to prevent or suppress the accumulation of the liquid refrigerant inside.

In the above embodiment, the refrigerant liquid pool 46 is arranged in the container 1. However, if it is inside the partition wall 41, it is arranged in the evaporator section 15, the air passage 16, the blowout chamber 18, and the like. You can also do it.

[0016]

According to the present invention, when the refrigeration system is stopped for a long period of time, the liquid refrigerant accumulates in the refrigerant liquid reservoir provided in the suction pipe, so that the liquid refrigerant can be prevented or suppressed from accumulating in the compressor. Thus, it is possible to prevent the liquid compression at the time of starting the compressor, prevent the compressor from being destroyed due to the liquid compression, and improve the reliability of the refrigeration system.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic perspective view of a conventional container.

FIG. 3 shows a schematic configuration of a conventional container refrigeration unit, (A) is a front view, (B) is a vertical sectional view taken along the arrow BB of (A), and (C) is (B). It is a cross-sectional view taken along the line CC in FIG.

[Explanation of symbols]

 1 Container 41 Internal and External Partition Wall 15 Evaporator Section 10 Evaporator 42 Condenser Section 3 Compressor 4, 5 Condenser 13 Accumulator 45 Suction Pipe 45 Refrigerant Liquid Pool

Claims (1)

[Claims] 1. An evaporator section through which air in a container flows and a condenser section through which outside air flows are partitioned by inner and outer partition walls, and an evaporator or the like is arranged in the evaporator section, and the condenser section is provided in the condenser section. In a container refrigeration unit in which a compressor, a condenser, an accumulator, etc. are arranged, a suction pipe connecting the accumulator and the compressor is piped through the inside of the container and a portion of the suction pipe inside the container. A refrigerating unit for containers, characterized in that a refrigerant liquid pool is provided in the.