JPH0811686B2 - Dry ice snow filling device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filling device for filling dry ice snow into a heat insulating container containing a cold-stored product when delivering the cold-stored product such as frozen food.

[0002]

2. Description of the Related Art Conventionally, low-temperature storage products delivered from retailers to general consumers have been stored in a heat insulating container such as styrofoam, and the heat insulating container has been packed with dry ice snow. And as a device for filling dry ice snow into this heat insulation container, conventionally,
Dry ice snow formed by arranging snow horn and heat insulating container transportation means vertically inside the casing and expanding liquefied carbon dioxide to a pressure lower than the triple point pressure inside the snow horn is transferred to the casing. Insulated containers are provided for filling.

[0003]

However, in the conventional dry ice snow filling device, since the lower end portion of the snow horn is thrust into the casing, the upper portion of the snow horn is exposed to the inside of the room, and this indoor exposed portion Dry ice easily sublimes due to heat input from frost and convection of water in the air, which not only reduces the efficiency of dry ice snow generation, but also contaminates the inside of the device due to water droplets falling when the filling device is stopped and the device drive part. There was a problem that the reliability of. The present invention has been made in view of such a point, and an object thereof is to provide a filling device for dry ice snow capable of forming and filling dry ice snow with high generation efficiency.

[0004]

In order to achieve the above-mentioned object, the present invention has a gas-liquid separator and a snow horn which are arranged one above the other in a casing. It is characterized in that the vaporized gas discharge part is arranged on the side and the inlet and outlet of the heat insulating container are opened to the minimum on the side wall of the casing.

[0005]

According to the present invention, the gas-liquid separator and the snow horn are vertically arranged in the casing, and the vaporized gas discharge portion is arranged below the conveying means arranged below the snow horn. Since the inlet and outlet of the heat insulating container are opened to the minimum, the gas-liquid separator and the snow horn are not exposed to indoor air, and it is possible to suppress heat intrusion into the snow horn from the outside. It will produce dry ice snow efficiently.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings are schematic views of a dry ice snow filling device showing an embodiment of the present invention. In this dry ice snow filling device, a gas-liquid separator (2) and a snow horn (3) are vertically arranged inside a box-shaped casing (1) made of a heat insulating panel, and below the snow horn (3). The transfer means (5) of the heat insulating container (4) is arranged on the side.

Five snow horns (3) are arranged along the conveying direction of the conveying means (5), and each snow horn (3) has a cylindrical body (6) whose upper end is formed in a downward hemispherical shell and a nozzle. It is composed of (7) and. Each nozzle (7) communicates with the bottom of the gas-liquid separator (2) through a liquefied carbon dioxide introduction passage (8), and each liquefied carbon dioxide introduction passage (8) has a gas-driven flow path. An on-off valve (9) is arranged.

The transfer means (5) is composed of a roller conveyor, and the processing section transfer means (5) arranged in the casing (1) is used.
a), a carry-in conveyor (5b) for feeding the heat insulating container (4) to the casing (1), and a carry-out conveyor (5c) for discharging the heat insulating container (4) from the casing (1). Then, the processing section transfer means (5a), the carry-in conveyor (5b), and the carry-out conveyor (5c) have the transfer surfaces formed on the upper surfaces thereof located on the same plane so that the transferred objects can be continuously transferred. It is located at.

A heat insulating container (4) is installed in the processing section transfer means (5a).
A gas-driven stopper (10) for stopping at a position immediately below the snow horn (3) is arranged to be switchable between a state in which it projects above the transport surface and a posture in which it retracts below the transport surface. Further, a gas-driven stopper (11) for restricting the carry-in of the heat insulating container (4) is also arranged between the carry-in conveyor (5b) and the processing section conveying means (5a), and the heat insulating container (4) The delivery is controlled. Further, a carry-in port (12) and a carry-out port (13) are opened to the minimum on the opposing side walls of the casing (1) so that the heat insulating container (4) can pass therethrough. Further, the gas-driven stopper (11) for restricting the carry-in of the heat insulating container (4) is located in the casing rather than the carry-in inlet (12).
It is provided at a position slightly inside the inner part of (1).

A gas-driven flow passage opening / closing valve (9) and a transfer passage arranged in a liquefied carbon dioxide introduction passage (8) connecting the gas-liquid separator (2) and the nozzle (7) of the snow horn (3) The two gas-driven stoppers (10) and (11) arranged corresponding to (5) are
The switching operation can be performed with dry air or dry nitrogen supplied from the outside of the casing (1). In addition,
The operating dry air or dry nitrogen after being used for the switching operation may be discharged into the casing (1) or may be discharged into the switching operation panel (not shown).

The bottom wall (14) of the casing (1) is formed in a hopper shape, and a discharge duct (15) for discharging vaporized gas is opened at its lowest position. This exhaust duct (15)
The central axis of the heat insulating container in the transport direction is the casing (1)
Insulation container of the carry-in port (12) rather than the central axis in the transport direction
It is placed side by side. Also this discharge duct (15)
The exhaust fan (16) is attached to the.

A gas-liquid separator is provided at the top of the casing (1).
The vaporized gas release pipe (17) derived from (2) is opened, and the vaporized gas release pipe (19) derived from the liquefied carbon dioxide supply passage (18) to the gas-liquid separator (2) is opened. . Then, the discharge on-off valve (20) is discharged to the vaporized gas discharge pipe (17) derived from the gas-liquid separator (2), and the vaporized gas discharged from the liquefied carbon dioxide supply passage (18) is discharged to the discharge pipe (19). An on-off valve (21) for each is interposed. Further, the liquefied carbon dioxide supply path (18) and the gas-liquid separator (2) are connected by an expansion tube (22). The gas-liquid separator (2) and the expansion tube (22) are heat-insulated.

In the dry ice snow filling device having the above structure, the heat insulating container is provided with the stopper (10) arranged in the processing section conveying means (5a) protruding above the conveying surface.
Bring (4) into the casing (1), and at the time of this loading, carry-in entrance
Insulation container with counter (not shown) placed in (12) part
(4) is counted, and when the number of heat-insulating containers (4) carried into the casing (1) reaches a predetermined number (five in this example), the carrying-in conveyor (5b) and the processing section carrying means (5a) The stopper (11) arranged between them is projected to stop the loading of the heat insulating container (4).

The heat-insulating container (4) carried into the casing (1) is received by the stopper (10) and is located immediately below each snow horn (3). Then, the flow channel opening / closing valve (9) arranged in the liquid carbon dioxide introducing passage (8) to the nozzle (7) of the snow horn (3) is opened for a certain period of time to allow liquid carbon dioxide to be introduced into the snow horn (3). To generate dry ice snow, and the dry ice snow is accumulated in the heat insulating container (4) to fill the heat insulating container (4) with the dry ice snow.

When the jetting of the liquid carbon dioxide at the snow horn (3) is stopped, the stopper (10) arranged in the processing section transfer means (5a) is retracted from the transfer surface, and the heat insulating container filled with dry ice snow ( 4) is carried out, and the stopper (11) arranged between the carry-in conveyor (5b) and the processing section carrying means (5a) is withdrawn from the carrying surface to carry in the next heat insulating container (4) to a predetermined position. To do.

During this work, the exhaust fan (16) is continuously operated, and the carbon dioxide gas which has not become snow is sucked out from the exhaust duct (15), and the carbon dioxide gas leaks to the outside of the casing (1). To prevent the work environment from being deteriorated. Moreover, the gas vaporized in the gas-liquid separator (2) arranged in the casing (1) is a gas-liquid separator.
(2) When the amount of storage inside reaches a certain amount, vaporized gas discharge pipe
The discharge on-off valve (20) arranged in (17) is opened to discharge the vaporized gas in the gas-liquid separator (2) into the casing (1).

When the dry ice snow filling work is stopped for a certain period of time and then restarted, the liquid carbon dioxide is vaporized in the liquefied carbon dioxide supply passage (18), and this vaporized gas is liquefied carbon dioxide supply passage (18). ), But prior to resuming operation, the on-off valve (21) for discharge, which was placed in the vaporized gas discharge pipe (19) derived from the liquefied carbon dioxide supply path (18), was opened to open the liquefied carbon dioxide. Since the vaporized gas accumulated in the supply passage (18) is discharged into the casing (1) and the air in the casing (1) is purged with the vaporized gas, the casing
When liquefied carbon dioxide is injected into the inside of (1), it is possible to prevent water contained in the air from freezing and to prevent dew condensation on the flow path opening / closing valve (9).

Further, the carry-in port (12) and the carry-out port (13) of the heat-insulating container (4) opened in the casing (1) are set to have a minimum opening area, and the carry-in port is not loaded during operation. Mouth (12)
Since the next adiabatic container (4) is in a rushed state, the inflow of air from the carry-in port (12) side is suppressed. on the other hand,
The central axis of the discharge duct (15) extending from the hopper forming the bottom wall (14) of the casing (1) in the heat-insulating container transport direction is the central axis of the casing (1) in the heat-insulating container transport direction. Since it is placed closer to the carry-in port (12) side than that, the suction force of the exhaust fan (16) acting on the carry-out port (13) side is weak and the inflow of outside air from the carry-out port (13) is suppressed. It

[0019]

According to the present invention, the gas-liquid separator and the snow horn are vertically arranged in the casing, and the vaporized gas discharge portion is arranged below the conveying means arranged below the snow horn.
Since the inlet and outlet of the heat insulating container are opened to the minimum on the side wall of the casing, the gas-liquid separator and the snow horn are not exposed to indoor air, and heat from entering the snow horn from the outside is prevented. Since it can be suppressed, dry ice snow can be efficiently generated.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a dry ice snow filling device showing an embodiment of the present invention.

[Explanation of symbols]

1 ... Casing, 2 ... Gas-liquid separator, 3 ... Snow horn,
4 ... Adiabatic container, 5 ... Conveying means, 8 ... Liquefied carbon dioxide introduction passage, 9 ... Gas-driven flow path opening / closing valve, 10/11 ... Gas-driven stopper, 12 ... Carry-in port, 13 ... Carry-out port, 15 ... Vaporization Gas discharge part, 17 and 19 ... Vaporized gas discharge pipe, 18 ... Supply path.

Claims (4)

[Claims] 1. A snow horn (3) and a transfer means (5) for an adiabatic container (4) are vertically arranged in a casing (1), and liquefied carbon dioxide is supplied in the snow horn (3) more than a triple point pressure. In a dry ice snow filling device for filling dry ice snow formed by expanding to a low pressure into a heat insulating container (4) transferred into a casing (1) by a transfer means (5), Gas-liquid separator (2) and snow horn (3) in casing (1)
Are arranged above and below, the vaporized gas discharge part (15) is arranged below the conveying means (5) arranged below the snow horn (3), and the heat insulating container (4) is arranged on the side wall of the casing (1). A device for filling dry ice snow, characterized in that a carry-in port (12) and a carry-out port (13) of said are opened to a minimum. 2. A gas-liquid separator from a liquefied carbon dioxide supply source.
The vaporized gas discharge pipe (19) derived from the supply channel (18) for supplying liquefied carbon dioxide to (2) and the vaporized gas discharge pipe (17) derived from the gas-liquid separator (2) are connected to the casing ( The device for filling dry ice snow according to claim 1, wherein the device is opened at the uppermost portion in 1). 3. A gas-driven flow passage opening / closing valve (9) is arranged in a liquefied carbon dioxide introducing passage (8) connecting a gas-liquid separator (2) and a snow horn (3), and a conveying means (5). ) A gas-driven stopper that holds the insulated container (4) in place
(10) (11) is arranged in the moving area of the heat insulating container (4) so as to be able to move in and out, and is used as a gas for operating the gas-driven flow path opening / closing valve (9) and the gas-driven stoppers (10) (11). The filling device for dry ice snow according to claim 1 or 2, wherein dry air or dry nitrogen gas is used. 4. The vaporization gas discharge part (15) according to any one of claims 1 to 3, wherein the discharge duct opening is biased toward the carry-in entrance (12) side with respect to the central portion in the heat insulating container carrying direction. The described dry ice snow filling device.