JP2002277153A - Sealing structure of opening part of cryogenic cooling and cold insulation vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing structure of an opening part of a cooling and cold insulation vessel in which cryogenic temperature of -60 deg.C to -180 deg.C is efficiently maintained, the pressure of the cooling and cold insulation vessel can be maintained to 1 kPa and cold air little leaks even by a large door. SOLUTION: In the sealing structure 10-1, the opening part 12 of a vessel main body 1 for cooling and cold insulating an article at cryogenic temperature is closed by the door 13. A recessed metal frame 2 is attached along a peripheral surface 1a of the opening part 12 superposed on the door 13 and the recessed metal frame 2 is filled with an elastic packing 3. A metallic protruding part 5 provided with a heater 6 therein is provided along the inner peripheral surface part 13a of the door 13 opposed to the recessed metal frame 12 on the peripheral surface 1a of the opening part 12. When the opening part 12 of the vessel main body 1 is closed by the door 13, the metallic protruding part 5 of the door 13 enters the packing 3 in the metal frame 2 of the opening part of the vessel, so that the packing 3 is heated to maintain a flexibility and a closed state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for cooling crushed objects such as lump-shaped articles to a temperature of -60 DEG C. or less when crushing at a low temperature in order to reuse industrial waste resources. The present invention relates to a structure of an opening of a cooling and cooling container for keeping a crushed object cooled at a low temperature to maintain brittleness.

[0002]

2. Description of the Related Art In order to facilitate the crushing of a crushed object, means for cooling the crushed object to a low temperature and performing a low-temperature embrittlement treatment are taken. The temperature varies depending on the physical properties of the object to be crushed, but is generally cooled to an extremely low temperature of -60 to -180C. In order to cool to such an extremely low temperature,
Usually, liquid nitrogen is effectively used. In the cooling by using liquid nitrogen, an object to be cooled is stored in a cooling and cooling container, and liquid nitrogen is directly introduced into the cooling and cooling container by injection or the like to cool the container. In this case, the operation is usually performed in a state where the pressure in the cooling / cooling container is close to the atmospheric pressure. or,
Even if the liquid nitrogen slightly leaks during cooling, the slight leak does not greatly affect the cooling performance. Therefore, a general Tomoe packing is used at the opening of the cryogenically cooled refrigerating container.

However, when the above-mentioned tom-shaped packing for general use is exposed to a low temperature, it hardens at a low temperature, thereby impairing the airtightness and increasing the leakage. Therefore, in the hermetic structure using the conventional tom-shaped packing, as shown in a partially enlarged sectional view of the opening of the cooling / cooling container shown in FIG. The hermetically sealed structure by 23 is such that a flexible box-shaped packing 24 is arranged along the container peripheral surface 21a of the opening 22, and a metal plate 26 integrated with the heater 25 is provided on the door 23 in opposition thereto. is there. FIG. 4A shows the state when the door is opened, and FIG. 4B shows the state when the door is closed. When the door 23 is closed, as shown in FIG.
A metal flat plate 26 having a heater 25 disposed on the door 23 is pressed against the flexible tom-shaped packing 24 disposed on a, and closes the opening 22 while maintaining close contact. During this time, the box-shaped packing 24 is heated by the heating means of the heater 25 provided on the metal flat plate 26 to prevent low-temperature hardening due to freezing or the like, and to maintain flexibility to maintain airtightness. I have.

In the closed structure using the Tomoe packing 24, the Tomoe packing 24 is heated by the heater 25 provided on the metal flat plate 26 at the time of sealing.
The portion not in contact with the heater 25 is exposed to cold air to cause low-temperature curing, or the internal cavity 24 of the toe-shaped packing 24.
The air a shrinks at low temperature, the flexibility required for the tom-shaped packing 24 decreases, and the adhesion to the metal flat plate 26 is lost.

In a conventional cryogenic refrigerator using liquid nitrogen, the pressure inside the refrigerator is close to the atmospheric pressure. Therefore, the ability of the closed structure of the opening to hold a pressure of about 0.2 kPa was sufficient. However, in recent years, a cooling system using cryogenic air at -60 ° C or lower has been developed. In the cooling system using the cryogenic air, a method is adopted in which the air is circulated in the system to gradually cool the air while lowering the dew point. In some cases, the temperature may be increased to about 1 kPa or more and used at a pressure of about 2 kPa or more. Therefore, if a conventional cooling and cooling container using liquid nitrogen is used in a cooling system using cryogenic air of -60 ° C. or lower, cold air leaks from the opening of the cooling and cooling container, and an external device having a high dew point at a high temperature. Air has been sucked into the system, causing the cooling efficiency to be extremely reduced or causing freezing to cause trouble in the cooling system.

[0006] On the other hand, in a cooling / cooling container used at a very low temperature, it is indispensable to take measures against distortion caused by shrinkage of the casing caused by the low temperature. In particular, in the case of a cooling / cooling container in which the object to be cooled is large, the opening required for taking in and out the door is large, and the door is also required to be large, the shrinkage width is large, so that it is more difficult to maintain airtightness. In other words, it has been found that if a conventionally used door is directly enlarged, the airtightness of the opening is reduced, a large amount of cold air leaks, and this causes a trouble in operation.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances.
In the opening structure of the cryogenic cooling and cooling container, the opening and closing operation is easy, and the temperature in the cooling and cooling container is -60.
It is an object of the present invention to provide a cooling and cooling container having an opening structure in which cold air inside does not leak even when a cryogenic temperature of -180 ° C is efficiently maintained and the pressure in the cooling and cooling container is 1 kPa.

[0008]

Means for Solving the Problems In order to solve the above-mentioned problems, as an invention according to claim 1, a structure for hermetically sealing an opening of a container for cooling and keeping an article at an extremely low temperature with an openable and closable door is provided. Along with the peripheral surface overlapping with the door of the opening of the cooling and cooling container, a concave metal frame that opens to the door side is attached, and the concave metal frame is filled with elastic packing in a solid state. In addition, a contact surface equal to or larger than the frame width of the metal frame is arranged on the inner peripheral portion of the door facing the concave metal frame provided in the container opening, and the contact surface is formed along the corresponding contact surface. A metal projection provided with a heater inside, and when the sealing is performed such that the door overlaps with the peripheral surface of the opening of the cooling / cooling container, the metal projection of the door is provided on the peripheral surface of the container opening. Cryogenic cooling characterized by being invaded by damaged packing It is obtained by the opening closed structure of the cold vessel. The invention according to claim 2 is a structure in which an opening of a container for cooling and cooling an article at an extremely low temperature is hermetically sealed with an openable and closable door, and a peripheral surface overlapping the door of the opening of the cooling and cooling container. Along with, a concave metal frame that opens to the door side is attached, and the concave metal frame is filled with an elastic packing in a solid state, while the concave metal frame is provided at the container opening. In the peripheral portion of the inner surface of the door, a contact surface equal to or greater than the frame width of the metal frame is arranged, and a metal protrusion having a heater disposed inside along the corresponding contact surface is provided. At the time of sealing in which the peripheral surface of the opening of the cooling and cool container overlaps with the door, the metal projection of the door enters a packing provided on the peripheral surface of the container opening, and the cooling and cooling container Inside the concave metal frame attached to the peripheral surface of the opening, the concave metal And a flexible seal packing portion provided with a seal tongue piece portion formed of a seal member extending in a tongue shape at the tip of the packing member. A concave weir for receiving the seal packing portion on the door in opposition to the door, and when the door overlaps with the peripheral surface of the opening of the cooling / cooling container and the door overlaps, the cooling / cooling container is provided on the concave weir arranged on the door. Wherein the seal tongue portion of the seal packing portion arranged in the above is pressed by an internal pressure and brought into contact with the seal tongue.

The invention according to claim 3 is characterized in that the flexible seal packing portion is provided with a heating heater for preventing low-temperature curing of the seal packing portion. It has a closed structure for the opening of the cooling / cooling container. According to a fourth aspect of the present invention, the heater in the metal projection holds the packing disposed on the peripheral surface of the container opening at a temperature equal to or higher than the low-temperature curing temperature of the packing. The cryogenic cooling / cooling container according to any one of the above, has an opening-sealed structure. According to a fifth aspect of the present invention, a door of the cryogenic cooling and cooling container has one end rotatably supported by an opening of the cooling and cooling container by a rotating member for engagement, and presses and locks the door. The cryogenic cooling and cooling container according to any one of claims 1 to 4, further comprising a jig.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a closed structure for an opening of a cryogenic cooling and cooling container according to the present invention will be described with reference to the drawings. [Overview of the Overall Structure of the Cryogenic Cooling and Cooling Container of the Present Invention] First, an outline of the overall structure of the cryogenic cooling and cooling vessel of the present invention is schematically shown with a partially cut front view of the cryogenic cooling and cooling vessel shown in FIG. This will be described with reference to the drawings. As shown in FIG. 1, an opening 12 of a cooling and cooling container 11 of the present invention is closed by a door 13. One end of the door 13 is rotatably supported by a rotating member 14 for engagement. And as a jig for fixing the door 13, a pipe handle 15 is provided in the center,
A roller aperture handle 16 is provided at the other end. In addition, the door 13 of the cooling and cool container of the present invention is reinforced with a reinforcing material 17 such as a mold steel for the purpose of uniformly tightening the opening 12 with packing and preventing deformation of the exterior of the door 13. I have. With such a structure, even a large door can be easily tightened, and the sealing performance can be improved.

In the above-described embodiment of the cryogenic cooling / cooling container of the present invention, an example in which the pipe handle 15 and the roller squeezing handle 16 are used as the jig for fixing the door 13 has been described. The method is not limited to this other method, and other fastening jigs can be used as long as tightening is sufficiently possible. Also, reinforcement member 1
Regarding 7, it goes without saying that an L-shaped steel, a U-shaped steel, a prism, an H-shaped steel or the like can be appropriately used.

Next, with respect to an embodiment of the closed structure of the opening 12 of the cryogenic cooling / cooling container 11 of the present invention having the above-mentioned structure, FIG. 2 shows a first embodiment, and FIG. Each of the embodiments will be described by way of example. [First Embodiment of Sealing Structure of Opening 12] FIG.
FIG. 2 is a partially enlarged cross-sectional view of an opening 12 illustrating an example of an opening sealing structure 10-1 according to the first embodiment. Note that FIG.
1, components common to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and detailed description is omitted.

As shown in FIG. 2, a door 13 is formed on the peripheral surface 1a of the opening 12 of the container body 1 of the cryogenic cooling / cooling container 11 so as to make a round along the peripheral surface 1a of the opening 12.
A concave metal frame 2 that opens toward the door 13 is disposed in order to abut the door 13, and the packing 3 is solidly filled in the metal frame 2. Here, as the packing 3, it is preferable to use a solid material which is easy to mold, has high elasticity, hardly cures at low temperatures, and is solid, for example, silicon rubber or the like.

On the other hand, the door 13 has a peripheral portion 13a on its inner surface.
The contact surface 4 which is in contact with the metal frame 2 having a width equal to or greater than the width of the metal frame 2 provided on the peripheral surface 1a of the opening 12 of the container body 1 is formed along ing. The corresponding contact surface 4 has an inverted U-shaped metal protrusion 5.
When the opening 13 of the container body 1 is closed with the door 13, the packing in which the metal protrusion 5 fills the metal frame 2 disposed on the peripheral surface 1 a of the opening 22 of the container body 1. By press-fitting the gasket 3 and preventing the packing 3 from spreading significantly outside, a large contact area is created at the contact portion between the metal projection 5 and the packing 3, and sealing can be reliably performed. And the internal pressure in the container body 1 is 1 kPa
Even when the pressure is increased as described above, the inside of the container body 1 is extremely airtightly shut off from the outside air, and it is possible to establish extremely excellent airtightness.

In the above embodiment, the shape of the metal projection 5 is inverted U-shaped, but may be convex, semicircular, or triangular. It may be appropriately selected and determined according to the compatibility with the material of the packing 3 provided on the container body. In addition, even if the packing 3 is made of a material that can be used as a packing, low-temperature curing will occur if the cooling ultimate temperature of the cooling and cooling container 11 is set to about −150 ° C. For example, when a silicone rubber that can be used as the packing 3 is used, the silicone rubber is cured at a low temperature of −60 ° C. or less. Therefore, when cooled to a temperature of −60 ° C. or lower, the flexibility decreases due to low-temperature curing, and the contact portion cannot maintain sufficient airtightness.

Therefore, as a method of preventing the low-temperature curing of the packing 3, in the opening sealing structure 10-1 of the present invention, the metal disposed along the peripheral portion 13 a (contact surface 4) of the inner surface of the door 13 is used. The heater 6 is provided inside a metal protruding portion 5 having an inverted U-shape. Then, the metal projection 5 is heated by this, and when the opening 12 of the container body 1 is closed by the door 13, the heated metal projection 5 is pressed into the packing and is brought into contact with the packing. Warm,
Low-temperature curing of the packing 3 due to low-temperature cooling can be prevented. Further, the metal projection 5 heated to a temperature higher than the low-temperature curing temperature is pressed into the packing 2 and abuts thereon as described above, so that the packing 3 made of a material such as silicon rubber having low thermal conductivity also serves as a seal. Since heat is sufficiently transmitted, the packing 3 can maintain sufficient flexibility to maintain airtightness even under a pressure of 1 kPa. In addition, since the packing 3 of the present invention has a structure without a large cavity unlike the box-shaped packing 24 illustrated in FIG. It is not affected by the decrease in adhesion due to shrinkage.

The heater 3 installed inside the metal projection 5 may be linear or plate-shaped. The height (length) of the metal protrusion 5 is suitably about half the thickness of the packing 3 disposed on the container body 1 with which the metal protrusion 5 comes into press contact.

As described above, in the hermetically sealed structure 10-1 of the cooling and refrigerating container of the first embodiment, when the opening 13 of the container body 1 is closed by the door 13, the metal projection provided on the door 13 is closed. 5 is press-fitted and embedded in the packing 3 disposed in the container body, so that the contact portion of the seal is in a state of forming a curved surface and is in contact therewith. Slight shrinkage increases the adhesion between the metal protrusion 1 and the packing 2, so that the adaptability to shrinkage of the housing is greatly improved as compared with the conventional method using a tom-shaped packing. . In addition, it is indispensable to take measures against distortion caused by shrinkage of the container body 1 caused by lowering the temperature, and the shrinkage width becomes large, making it difficult to maintain airtightness. In particular, in a cooling / cooling container provided with a large door, the effect of maintaining the airtightness is significantly improved by applying the above-described closed structure 10-1 of the present invention.

[Second Embodiment of Sealing Structure of Opening 12] FIG. 3 is a partially enlarged view of an opening 12 for explaining an example of an opening sealing structure 10-2 according to a second embodiment of the present invention. It is sectional drawing. In FIG. 3, the parts common to FIG.
The same reference numerals are given to the same reference numerals, and the detailed description is omitted.

The sealing structure 10-2 of the second embodiment shown in FIG. 3 is different from the sealing structure 10-1 of the first embodiment shown in FIG. A seal packing portion 7 is provided along the peripheral surface 1a inside the metal frame 2 provided on the peripheral surface 1a. The seal packing portion 7 is provided at the opening 12 of the container body 1 on the inner opening 12 side of the metal frame 2 provided on the peripheral surface 12 of the opening in the container body 1.
Metal plate 8 erected along the peripheral surface 1a of the
A convex packing member 9a made of a flexible material such as silicon rubber and projecting downward with a U-shaped cross section surrounding the metal plate 8, and the convex packing member 9a And a tongue-shaped seal tongue piece 9b integrally provided at the tip of the tongue.

On the other hand, the inner peripheral portion 13a on the side of the door 13 with which the seal packing 7 comes into contact is located inside the metal projection 5 provided so as to match the metal frame 2 provided on the container body 1. A concave dam portion 13b is provided at a position facing the seal packing portion 7 provided on the container main body 1 so that the seal tongue piece 9b of the seal packing portion 7 abuts. When the opening 12 of the container body 1 is closed by the door 13, the sealing tongue piece 9 b of the seal packing portion 7 is provided on the outer side surface 13 c of the concave weir 13 b provided on the door 13.
Are pressed by the internal pressure and come into close contact with each other to hermetically block the flow of gas between the inside and outside of the container. The seal packing part 7
It is preferable that the length of the seal tongue piece 9b is substantially equal to or longer than the length to the bottom surface of the concave weir 13b.

The closed structure 10 according to the second embodiment described above.
By adopting -2, it is possible to prevent cold air of -60 ° C or less from directly touching the packing 2, and as the pressure in the cooling and cooling container 11 increases, the sealing tongue piece 9b becomes the concave weir 13b of the door 13. Is strongly pressed by the side surface 13c of the container body 1, and the airtightness of the contact between the opening 12 of the container body 1 and the door 13 is strengthened.

In the seal packing portion 7 having the above-mentioned shape, the flexible material such as silicon rubber used for the seal packing portion 7 may be cured at a low temperature when exposed to a low temperature of -60 ° C. or less. Therefore, in order to prevent low-temperature curing, the metal plate 8 disposed around the convex packing member 9a is provided with a heater function, or the metal frame 2 and the convex packing member 9a are separately provided. Heating means H such as a heater is provided at a position close to the convex packing member 9a between the concave portions and the concave weir portion 13b provided on the door 13 and / or the side surface 13c thereof, so that the seal packing portion 7 is appropriately heated. To
Thereby, higher flexibility of the seal packing 7 can be secured. The inner surface 13d of the door 13 inserted into the opening 12 of the container main body 1 is in contact with the opening 12 of the container main body 1.
The leakage of the cool air can also be reduced by reducing the gap and the step with the inner surface 1b.

Since the opening sealing structure of the cryogenic cooling and cooling container of the present invention has the above-described structure, the opening and closing operation of the door 13 to the opening 12 of the container body 1 of the cooling and cooling container 11 is easy. In addition, the temperature in the cooling and cooling container 11 can be set to −60 to −180 ° C., and even when the pressure in the cooling and cooling container 11 is set to 1 kPa, the seal is ensured. Held in
It has become possible to obtain a cryogenically cooled insulated container in which cool air does not leak outside. In addition, it is effectively applied as a cooling / cooling container of a cooling system using a low-temperature air generator, which had a problem in maintaining the hermeticity, or as a closed structure of an opening of a cooling / cooling container requiring a large door. be able to.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, as an embodiment of a closed structure of a cryogenically cooled refrigerating container of the present invention, an example in which domestic industrial waste is cooled to a cryogenic temperature during crushing treatment and used for cooling is illustrated. explain. [Example 1] As the closed structure of the opening of the cryogenic cooling and cooling container of the present invention used, the closed structure of the opening of the second embodiment shown in FIG. 3 was used. The whole structure was manufactured and used as a cooling and cooling container having a structure as shown in FIG. The design specifications are as follows.

<Design Specifications of Cooling and Cooling Container> Exterior: A stainless steel plate was used. -Dimensions of the door 13: about 1.5 m square, equipped with two L-shaped steel reinforcements 17 vertically and three left and right to tighten the packing evenly and to prevent deformation of the outer tank of the door. . A support mechanism for the door 13: A jig for pressing and fixing such as a pipe handle 15 and a roller squeezing handle 16 was used to pivotally support one end of the door 13 with a rotatable engagement rotating member 14 and fix the door closed. As a result, even a door of about 1.5 m square was easily sealed and fastened. Cooling reached temperature: about -150 ° C.

<Specification Specifications of Opening Sealing Structure>-Recessed metal frame 2 arranged in container body 1: made of stainless steel, width 32 mm, depth 11 mm, and peripheral surface 1 a of opening 12.
It was arranged along. In addition, although the metal frame 2 was welded and constructed and attached, it may be constructed as an integral structure with the structure of the container body. -Packing 3 to be filled in the concave metal frame 2: Filling the entire concave metal frame 2 with a solid, highly elastic, relatively low-temperature hardening silicone rubber using a silicone rubber, the filling thickness is about 10 mm. did. -Metal projection 5 provided on inner surface 13a of door 13: stainless steel, 15 mm wide and 6 mm high provided along the outer peripheral surface. And the heater 6 for heating was arranged inside.

Seal packing part 7: A stainless steel metal plate 8 having a thickness of 1 mm and a height of 7 mm is arranged along the peripheral surface inside the metal frame 2 provided on the container body 1 and surrounds the periphery thereof. Then, a convex packing member 9a made of silicone rubber and having a height of 10 mm was provided, and a seal tongue piece 9b having a length of 20 mm was disposed at the tip thereof. The metal plate 8 was provided with a heater function. A concave weir portion 13 of the door 13 for receiving the sealing tongue portion 9b
b: Assuming a width of 30 mm and a depth of 15 mm, the seal tongue piece 9
It is provided at a position opposite to the position b. Then, the heater H was disposed in the concave weir portion 13b.

Using such a cryogenic cooling / cooling container having a closed structure at the opening, the container was cooled to about -120 ° C. by a low-temperature air generator and kept cool. As a result, the following items were confirmed. When the door 13 is closed, the packing 3 filled in the metal frame 2
The length of the metal projection 5 of the door 13 that entered the door 13 was about 4 mm. And when it rushed in, the packing 3 did not greatly spread outside, and was maintaining a fixed form. Although the pressure in the cooling and cooling container 11 reached 1.1 kPa,
The airtightness was sufficiently maintained, and the low temperature of about -120 ° C was efficiently maintained. Also, the metal plate 8 is provided in the metal protrusion 5 provided on the inner surface 13 a of the door 13, the metal plate 8 in the convex packing member 9 a of the seal packing portion 7, and the concave weir 13 b provided on the inner surface of the door 13. The packing 3 and the seal packing portion 7 are heated by the heater for heating, and the low temperature curing thereof can be prevented, the flexibility is always ensured, and the sealing property of the door 13 to the opening 12 of the container body 1 is improved. Significantly improved. About 1.5
It was confirmed that even with a large door of m square, sufficient airtightness could always be maintained. Note that the pressing fixture for closing the door is not limited to the pipe handle 15, the roller squeezing handle 16, and the like, and may be any pressing fixture as long as it is a fixing jig that can hold the airtight fixing. Can be used.

[0030]

The closed structure of the opening of the cryogenically cooled cool storage container of the present invention is embodied in the above-described embodiment, and has the following effects. A concave metal frame is provided at the opening of the container body of the cooling / cooling container, a solid packing is filled in the concave metal frame, and an inverted U-shaped metal projection is provided on the door side facing the concave metal frame. By disposing a heater inside the inverted U-shaped metal projection 1, when the opening of the container main body is closed with the door, the packing provided on the container main body is made of metal made of the door. The projections cut into the packing 2 when closed.
Can be effectively heated, flexibility is maintained, as a result, an airtight seal is secured even at an extremely low temperature of -60 to -180 ° C, and even if the pressure inside the container rises to about 1 kPa, This has the effect of maintaining airtightness.

Further, in addition to the airtight holding structure, a seal packing portion is disposed on the inner opening side of the packing portion filled in the metal frame, and a tongue-shaped seal is provided at the tip of the sealing portion. Since a tongue piece is provided and a concave weir is arranged on the door facing the tongue, when the internal pressure in the cooling / insulating container rises, the internal pressure causes the sealing tongue to become a wall of the concave weir of the door. To seal off the inside and outside of the container to ensure an air-tight seal, and the cool air in the cooling / cooling container exposes the hermetically sealed holding portion made of packing filled in the metal frame disposed on the outside. As a result, the airtightness can be maintained for a long time without deteriorating. In addition, by providing a heater function at a portion where the opening and the door of the container body forming the seal packing portion are in contact with each other, the convex packing member of the seal packing portion made of a flexible material and the seal tongue piece portion And the sealing property can be further improved.

From the above, the closed structure of the cryogenic cooling and cooling container of the present invention is difficult to seal with the conventional cooling and cooling container with respect to the cooling system in which the pressure inside the container is increased during cooling. It is possible to provide a cooling / cooling container having an opening-closed structure that is extremely effective in use. In addition, the opening of a cooling / cooling container for a cooling system using a low-temperature air generator, which had a problem in maintaining the hermeticity, and a large-sized door that requires a large degree of shrinkage distortion due to low temperatures. Even when the part is hermetically closed, it is possible to effectively apply the present invention.

[Brief description of the drawings]

FIG. 1 is a partially cutaway schematic front view of a cryogenically cooled cold storage container of the present invention.

FIG. 2 is a partially enlarged sectional view of an opening of the opening sealing structure according to the first embodiment of the present invention.

FIG. 3 is a partially enlarged sectional view of an opening of an opening sealing structure according to a second embodiment of the present invention.

FIG. 4 is a partially enlarged sectional view of an opening of a conventional cooling / cooling container.

[Explanation of symbols]

10-1... Opening sealing structure of the first embodiment 10-2
... the opening sealing structure of the second embodiment, 1 ... container body,
1a: Peripheral surface of the opening of the container main body, 1b: Inner surface of the opening of the container main body, 2: concave metal frame, 3: packing, 4
... contact surface, 5 ... metal protrusion, 6, H ... heater, 7
... seal packing part, 8 ... metal plate, 9a ... convex packing member, 9b ... seal tongue piece, 11 ... cryogenic cooling and cooling container, 12 ... opening, 13 ... door, 13a ... inner peripheral part of door, 13b: concave weir, 13d: inner surface inserted into the door opening, 14: rotating part for engagement, 15: pipe handle, 16: roller squeezing handle, 17: reinforcing material

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hidetoshi Ota 1-16-7 Nishi-Shimbashi, Minato-ku, Tokyo F-term within Nippon Oxide Co., Ltd. 3J040 AA01 AA11 BA07 EA22 EA40 FA05 HA22 3L102 JA07 KA01 KC02 KC07 KC08 KC10 KC11 KD09 KE03 LE02 LE03

Claims (5)

[Claims] 1. A structure for hermetically closing an opening of a container for cooling and cooling an article at an extremely low temperature with an openable and closable door, and along a peripheral surface overlapping the door of the opening of the cooling and cooling container. A concave metal frame that opens to the door side is attached, and the concave metal frame is filled with elastic packing in a solid state, and the door facing the concave metal frame provided in the container opening is provided. A metal projection in which an abutment surface equal to or greater than the width of the metal frame is provided on an inner peripheral portion, and a metal projection is provided along the corresponding abutment surface, inside which a heater is provided; A cryogenically-cooled refrigerated container, wherein the metal projection of the door is invading a packing provided on the peripheral surface of the container opening when the door is closed and the peripheral surface of the opening overlaps with the door. Opening closed structure. 2. A structure for hermetically sealing an opening of a container for cooling and cooling an article at an extremely low temperature with an openable and closable door, and along a peripheral surface overlapping the door of the opening of the cooling and cooling container. A concave metal frame that opens to the door side is attached, and the concave metal frame is filled with elastic packing in a solid state, while the door facing the concave metal frame provided in the container opening is provided. A metal projection in which an abutment surface equal to or greater than the width of the metal frame is provided on an inner peripheral portion, and a metal projection is provided along the corresponding abutment surface, inside which a heater is provided; When the door is closed and the peripheral surface of the opening overlaps with the door, the metal projection of the door enters the packing provided on the peripheral surface of the container opening, and the periphery of the opening of the cooling / cooling container. Inside the concave metal frame attached to the surface, parallel along the concave metal frame Standing convex packing member,
A flexible seal packing portion provided with a tongue-shaped sealing tongue portion at the tip of the packing member is provided, and a concave weir for receiving the seal packing portion on a door in opposition thereto is provided. During sealing, the peripheral surface of the opening of the cooling and cooling container overlaps with the door, and the sealing tongue piece of the seal packing portion provided on the cooling and cooling container is pressed against the concave weir provided on the door by internal pressure. A closed structure for an opening of a cryogenic cooling / cooling container characterized by being in contact with the container. 3. The opening of the cryogenic cooling / cooling container according to claim 2, wherein the flexible seal packing portion is provided with a heating heater for preventing low-temperature curing of the seal packing portion. Closed structure. 4. The heater in the metal protrusion maintains a packing disposed on a peripheral surface of the container opening at a temperature equal to or higher than a low-temperature curing temperature of the packing. Item 2. A closed structure for an opening of the cryogenic cooling / cooling container according to Item 1. 5. A door for the cryogenic cooling and cooling container, one end of which is rotatably supported by an opening of the cooling and cooling container by a rotating member for engagement, and a pressing fixture for closing the door. The closed structure for an opening of a cryogenic cooling and cooling container according to any one of claims 1 to 4, which is provided.