JP2831202B2 - Container refrigeration unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration 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 mounted on one end wall 2 thereof. Cargo is accommodated in the container 1 through a door (not shown) provided on the other end wall of the container 1, and the refrigeration unit 100 is operated so that the air temperature in the container 1 is in the range of -30 ° C to + 25 ° C. The container 1 is mounted on a ship, a truck, a railcar, or the like while being transported while maintaining the temperature set arbitrarily.

FIG. 5 shows a schematic configuration of the refrigeration unit 100, where (A) is a front view, (B) is a cross-sectional view taken along the line BB of (A), and (C) is a rear view. . The gas refrigerant discharged from the compressor 3 enters the water-cooled condenser 5 or the air-cooled condenser 4, where it is condensed and liquefied. The liquid refrigerant enters the electronic 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 it evaporates by cooling the internal air blown from the evaporator fan 12 driven by the motor 11. Then, the gas refrigerant returns to the compressor 3 via the accumulator 13.

[0004] As shown by a solid arrow, the air in the container 1 enters the suction chamber 15 through the suction port 14 and is urged by the evaporator fan 12 to be cooled in the process of flowing through the evaporator 10. The air returns to the container 1 through the air passage 16 and the blow-out chamber 18.

When the air-cooled condenser 4 is used, a motor
17 drives the capacitor fan 6. Then, as shown by the dashed arrow, the outside air heats up by exchanging heat with the gas refrigerant in the process of flowing through the air-cooled condenser 4,
It is urged and discharged by the condenser fan 6.

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

The drain condensed on the evaporator 10 drops on a drain pan 22 and passes through a drain pipe 23 to a drain port.
Emitted from 24.

Reference numeral 25 denotes a control box; 26, a liquid injection solenoid valve for injecting and cooling a liquid refrigerant into the compressor 3; 27, a 200V-class power plug;
28 is a 400V class power plug, 29 is a power transformer, 31 is a suction air temperature sensor for detecting the temperature of the air in the refrigerator sucked into the evaporator 10, 30 is a thermometer insertion port for checking the temperature sensor 31, 33 is an outlet air temperature sensor for detecting the temperature of the air blown out of the evaporator 10, 32 is an insertion port of a thermometer for checking the temperature sensor 33, and 34 is an outlet for detecting a refrigerant outlet temperature of the evaporator 10. 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 suction chamber 15, a handle 39 for attaching and detaching the inspection lid 38, and a ventilation device 40.

Reference numeral 41 denotes an inner and outer partition wall, which is fastened to the end wall 2 of the container 1 by a flange formed on the entire periphery thereof. A recess 42 is formed in the center of the lower portion of the inner and outer partition walls 41, and the compressor 3, the air-cooled condenser 4, the water-cooled condenser 5, the condenser fan 6, and the like are installed inside the recess 42. The suction chamber 15 is formed 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 the suction chamber 15, an evaporator 10, an evaporator towel 12, and the like are installed.

[0010] Details of the ventilator 40 is shown in FIG. 4,
(A) is a front view, (B) is a cross-sectional view along the BB arrow of (A). A ventilation lid 50 is rotatably supported on the outer surface of the inner and outer partition walls 41 by bolts and nuts 51, and an exhaust hole 52 and an intake hole 53 are formed in the ventilation lid 51.
A gasket 55 is adhered to the back surface of the ventilation lid 50.

In order to ventilate the interior of the container 1, the ventilation lid 50 is turned around the bolt 51 so that the exhaust hole 52 is in the exhaust passage 56 and the intake hole 53 is in the intake passage 57.
In this case, the inside air is discharged from the upstream side of the evaporator 10 to the outside through the exhaust passage 56 and the exhaust hole 52 ,
At the same time, fresh outside air is drawn into the downstream side of the evaporator 10 through the suction hole 53 and the suction passage 57.

In FIG. 4 , reference numeral 41A denotes an outer panel, 41B denotes an inner panel, and 41C denotes a heat insulating material filled between them, and these constitute an inner / outer partition wall 41. Reference numeral 59 denotes an intake tube, and 58 denotes an exhaust tube, each of which penetrates the inner / outer partition wall 41 and is mounted so that its outer end is inclined downward.

[0013]

In the above-mentioned conventional refrigeration unit, when fresh cargo such as fresh vegetables and fruits is stored in a container, the temperature in the refrigerator is set to the refrigeration temperature corresponding to the fresh cargo. At the same time, the ventilation lid 50 is rotated to adjust the passage areas of the exhaust passage 56 and the intake passage 57, thereby setting the ventilation volume corresponding to the fresh cargo and transporting the container 1.

When frozen cargo such as meat and fish is stored in the container 1, the temperature in the refrigerator is set to the freezing temperature corresponding to the frozen cargo, and the exhaust passage 56 and the intake passage 57 are entirely closed by the ventilation lid 50. Close and transport the container 1.

However, if the exhaust passage 56 and the intake passage 57 are forgotten to be closed by the ventilation lid 50 irrespective of whether the frozen cargo is stored in the container 1, the capacity of the refrigeration unit 100 is insufficient and the inside temperature of the refrigerator is reduced to a predetermined value. Since the frozen temperature cannot be maintained, there is a problem that the quality of the frozen cargo stored in the container 1 during the transportation is deteriorated, and the commercial value thereof is lost due to deterioration.

[0016]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is to discharge the air inside the container to the outside and at the same time to release the fresh air inside the container. In a container refrigeration unit provided with a ventilator for introducing a container, an opening / closing detecting unit for detecting opening / closing of the ventilating unit, a temperature setting unit for setting a temperature of air in the container, The set temperature is below a predetermined value by the input signal, and
The refrigeration unit for containers is provided with a forgetting-to-close determining means for outputting an alarm signal when the ventilator is open, and an alarm generating means for receiving an alarm signal from the forgetting-to-close determining means and issuing an alarm. .

[0017]

According to the present invention, since the above configuration is provided, when the ventilator is detected to be open by the detector even though the set temperature set by the temperature setter is below a predetermined value, the ventilator is closed. The forgetting means outputs an alarm signal to the alarm generating means, and an alarm is issued from the alarm generating means.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIGS. FIG. 1 is a control block diagram, and FIG. 2 is a control flowchart. When the control starts, the opening / closing of the ventilator 40 is detected by the open / close detecting means 70 in a step, and the temperature of the air in the container 1 in the container 1 is set by the temperature setting means 71 in a step. When the operation switch of the refrigeration unit 100 is turned on in the step, the outputs of the open / close detection means 70 and the temperature setting means 71 are input to the forgetting to close determination means 72, and the set temperature set in the temperature setting means 71 in the step is a predetermined value. (For example, −5 ° C.) or less, and whether or not the ventilator 40 is opened is determined in step.

When the set temperature is equal to or lower than a predetermined value and the ventilation device
When 40 is open, the forget-to-close determining means 72 outputs an alarm signal to the alarm generating means 73, and the alarm generating means 73 issues an alarm by a buzzer, lighting, or the like in a step.

A magnet is fixed to the ventilation lid 50 and the ventilation lid 50
When is turned to the closed position, if a reed switch is provided at the surface position of the inner and outer partition wall 41 corresponding to the magnet, the opening and closing of the ventilation device 40 can be easily detected. Further, a limit switch may be provided instead of the reed switch, and a striker may be provided on the ventilation lid 50.

[0021]

According to the present invention, an alarm is issued when the ventilator is open even though the set temperature is below a predetermined value, so that the commercial value of the frozen cargo is impaired due to forgetting to close the ventilator. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a control block diagram showing an embodiment of the present invention.

FIG. 2 is a control flowchart of the embodiment.

FIG. 3 is an external perspective view of the container.

FIG. 4 shows a conventional ventilator, (A) is a front view, (B) is
It is a longitudinal cross-sectional view which follows the BB arrow of (A).

5A and 5B show a schematic configuration of a conventional container refrigeration unit, wherein FIG. 5A is a front view, FIG. 5B is a cross-sectional view taken along the line BB of FIG. 5A, and FIG. .

[Explanation of symbols]

 1 Container 100 Refrigeration unit 40 Ventilation device 70 Open / close detection means 71 Temperature setting means 72 Forgetting closing judgment means 73 Alarm generation means

Claims (1)

(57) [Claims] 1. A container refrigeration unit provided with a ventilator for discharging air inside the container to the outside and introducing fresh outside air into the container at the same time, an opening / closing detecting means for detecting the opening / closing of the ventilator; Temperature setting means for setting the temperature of the air, and a set forgetting means for outputting a warning signal when the set temperature is equal to or less than a predetermined value by an input signal from the detection means and the temperature setting means and the ventilator is open, and the closed forgotten Re container refrigeration unit, characterized in that a warning generating means for generating an alarm receiving a warning signal from the determine by means.