JP2008055363A - Gas adsorption device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas adsorption device that allows a highly active gas adsorption agent prohibited to be left in atmosphere due to its quick reaction with air in a short period of time to be left in atmosphere. <P>SOLUTION: The gas adsorption device is constituted of an at least partially cylindrical container 3 equipped with an opening 2 on one end thereof and a partition wall 4 contacting the circumferential inner wall of the cylindrical part of the cylindrical container 3. A gas adsorption agent 5 and an unadsorbable gas 6 that cannot be adsorbed by the gas adsorption agent 5 are enclosed in the closed space formed by the cylindrical container 3 and the partition wall 4. Under a reduced pressure, the unadsorbable gas 6 expands and causes the partition wall 4 to detach from the cylindrical container 3 whereby the gas adsorption agent 5 is allowed to be in communication with the outer space. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to the field of equipment that requires high vacuum, such as vacuum heat insulating materials, cathode ray tubes, plasma display panels, and the like.

  In recent years, expectations for industrial technology that requires high vacuum are increasing. For example, energy saving is strongly desired from the viewpoint of preventing global warming, and energy saving is an urgent issue for household appliances. In particular, a heat insulating material having excellent heat insulating performance is required from the viewpoint of efficiently using heat in a heat and cold insulation device such as a refrigerator, a freezer, and a vending machine.

  As general heat insulating materials, fiber materials such as glass wool and foams such as urethane foam are used. However, in order to improve the heat insulation performance of these heat insulating materials, it is necessary to increase the thickness of the heat insulating material, and there is a limit to the space that can be filled with the heat insulating material, so when space saving and effective use of the space are necessary It cannot be applied.

  Therefore, vacuum heat insulating materials have been proposed as high performance heat insulating materials. This is a heat insulator in which a core material serving as a spacer is inserted into a jacket material having gas barrier properties and the inside is decompressed and sealed.

  By increasing the degree of vacuum inside the vacuum heat insulating material, high-performance heat insulating performance can be obtained, but the gas existing inside the vacuum heat insulating material is roughly divided into the following three types. One is the gas that cannot be evacuated during the vacuum insulation material production, and the other is the gas generated from the core material or jacket material after being vacuum-sealed (adsorbed on the core material or jacket material) The other one is a gas that passes through the jacket material and enters from the outside, such as a gas or a reaction gas generated by the reaction of unreacted components of the core material.

  In order to adsorb these gases, a method of filling the vacuum heat insulating material with the adsorbent has been devised.

  For example, there exists what adsorb | sucks the gas in a vacuum heat insulating material using a Ba-Li alloy (for example, refer patent document 1). Of the gases to be adsorbed by the adsorbent in the vacuum heat insulating material, one of the gases that are difficult to adsorb is nitrogen. This is because the nitrogen molecule is a nonpolar molecule having a large binding energy of about 940 kJ / mol, and thus it is difficult to activate. However, nitrogen can be adsorbed by the Ba-Li alloy, and the degree of vacuum inside the vacuum heat insulating material is maintained.

For the purpose of further improving the performance of the vacuum heat insulating material, the vacuum degree inside the vacuum heat insulating material is further reduced, and it is more active than Ba-Li for equipment that requires a high vacuum such as a plasma display panel. The practical application of a gas adsorbent is desired.
Japanese National Patent Publication No. 9-512088

  However, the conventional configuration described in Patent Document 1 does not require heat treatment for activation, can adsorb nitrogen even at room temperature, and can be handled in an air atmosphere for several minutes. Under conditions for industrially manufacturing an apparatus using an adsorbent, a longer allowable time is desirable for handling.

  This is because most of the nitrogen adsorption capacity is consumed in the manufacturing process that comes into contact with air, so that the adsorption capacity for maintaining the performance over time of the equipment using the gas adsorbent becomes poor, and the performance deterioration and performance variation increase. This is to prevent this. While further improvement in performance of vacuum heat insulating materials and the like is desired, in order to maintain the degree of vacuum inside the equipment, it has been a big problem to use the adsorbent more stably and efficiently.

  Furthermore, in the above structure, when a gas adsorbent having a higher activity than Ba-Li is used, there is a possibility that the contactable time with the atmosphere will be very short.

  An object of the present invention is to solve the above-described conventional problems, and to provide a gas adsorption device that can suppress deterioration in performance due to contact with the atmosphere even when the highly active gas adsorbent is handled in an air atmosphere.

  In order to achieve the above object, the gas adsorption device of the present invention encloses a gas adsorbent and a nonadsorbable gas that is not adsorbable with respect to the gas adsorbent inside the container so as to make contact between the gas adsorbent and the atmosphere. It is to suppress.

  In order to adsorb the gas inside the vacuum equipment, the gas adsorbent in the container needs to be connected to the internal space of the vacuum equipment such as the inside of the vacuum heat insulating material. The gas adsorbent can be installed in the internal space of the vacuum device without being brought into contact with the atmosphere near 1 atm by the following mechanism.

  A vacuum device is a device that exhibits its function when evacuated, such as a vacuum heat insulating material, a cathode ray tube, a plasma display panel, and a fluorescent lamp.

  The container is at least partially cylindrical, and has an opening in the cylindrical part. Furthermore, the cylindrical portion is provided with a partition wall that blocks the opening of the cylindrical portion of the container to form a closed space, suppresses air from entering the container, and prevents contact between the adsorbent and the atmosphere. It has been. In this closed space, non-adsorbing gas that is non-adsorbing with respect to the gas adsorbing material is enclosed, and when the gas adsorption device is placed under atmospheric pressure, the pressure of atmospheric pressure and non-adsorbing gas is There is a balance and no net force on the bulkhead is generated.

  On the other hand, when the gas adsorbing device is depressurized inside a vacuum device such as a vacuum heat insulating material, the pressure inside the closed space formed by the container and the partition wall becomes higher than the atmospheric pressure, so that the non-adsorbing gas expands. The pressure generated by the expansion moves the partition toward the opening of the tubular portion, and the tubular portion and the partition of the container are separated, so that the gas adsorbent comes into contact with the external space after being decompressed. With the mechanism as described above, the gas adsorbing material is installed inside the vacuum device without coming into contact with air under atmospheric pressure.

  The gas adsorption device of the present invention prevents contact between the gas adsorbent and the atmosphere under atmospheric pressure, and contacts the atmosphere outside the device under reduced pressure. When the gas adsorbent is applied to a vacuum device at atmospheric pressure, the gas adsorbent is not deteriorated by the atmosphere. Therefore, the gas adsorbent can exhibit its original performance after being applied to the vacuum device.

  The gas adsorbing device according to claim 1 of the present invention includes a container having an opening at one end and a part of which is cylindrical, and a partition wall in contact with an inner wall of the cylindrical part of the container. A gas adsorbent and a non-adsorbable gas that is non-adsorbable with respect to the gas adsorbent are enclosed in a closed space surrounded by the partition walls.

  Here, the term “cylindrical shape” refers to a shape having substantially the same cross-sectional area and cross-sectional shape at a plurality of locations, such as a cylinder, a triangular prism, and a quadrangular prism. The cross-sectional shape is not limited to these, and may be a rhombus, a parallelogram, a trapezoid, a pentagon, an ellipse, or the like.

  The non-adsorbable gas with respect to the adsorbent is a gas that the adsorbent cannot adsorb, and is an inert gas such as argon gas for a gas adsorbent that can adsorb only nitrogen and oxygen. .

  A partition wall is in contact with the inner wall of the cylindrical portion of the container that is at least partially cylindrical, and a closed space is formed by the container and the partition wall.

  A closed space is a space that does not pass through an object having a certain shape, such as the inside of a spherical shell, and does not connect to other spaces.

  The partition wall is preferably the same size and shape as the inner wall of the cylindrical portion of the container, so that no gap is generated between the inner wall of the cylindrical portion of the container and the partition wall. However, in industrial production, it is difficult to make the inner wall of the cylindrical portion of the container and the dimensions and shape of the partition wall completely the same. Therefore, the partition wall is slightly larger than the inner wall of the cylindrical portion of the container, and any one of these deforms so that the inner wall of the cylindrical portion of the container and the partition wall are in close contact with each other so that the tightness of the closed space is ensured. It is desirable to do.

  Since the non-adsorbing gas is sealed in the closed space with respect to the gas adsorbing material, mixing of the gas in the atmosphere in which the gas adsorbing device is placed is suppressed. Therefore, since the adsorbent does not come into contact with the gas in the atmosphere where the gas adsorbing device is placed, the gas adsorbing material deteriorates even if the gas adsorbing device is installed in a vacuum device in the atmosphere near 1 atm. do not do. On the other hand, inside the vacuum equipment, the gas adsorbent needs to come into contact with the atmosphere in which the gas adsorption device is placed, and this is realized by the following mechanism.

  When the inside of the vacuum device is depressurized after the gas adsorption device is installed in the vacuum device, the non-adsorbable gas existing in the closed space formed by the container and the partition wall expands. Due to the pressure generated by the expansion, the partition wall moves toward the opening of the cylindrical part, and the cylindrical part and the partition wall of the container are separated, and the gas adsorbent and the internal space of the vacuum device are connected. At the time when the cylindrical container and the partition wall are separated, the inside of the vacuum device is depressurized, and the gas adsorbent can adsorb the residual gas inside the vacuum device without contacting the atmosphere near 1 atm.

  The invention of the gas adsorption device according to claim 2 of the present invention is such that the container according to the invention of claim 1 is gas permeable to both the cylindrical portion and the non-cylindrical portion.

Here, the gas permeability, which is a property of low gas permeability, is small, and the gas permeability of a container made of the substance is 104 [cm ³ / m ² · day · atm] or less. More preferably, it is 103 [cm ³ / m ² · day · atm] or less.

  Specifically, metals such as copper, iron and aluminum, ethylene-vinyl alcohol copolymer, polyacrylonitrile, nylon 6, nylon 66, nylon 12, polybutylene terephthalate, polybutylene naphthalate, polyethylene terephthalate, polyethylene naphthalate , Polyvinylidene fluoride, polyvinylidene chloride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, polyimide, polycarbonate, polyacetate, polystyrene, ABS, polypropylene, polyethylene, etc. It is not limited to.

  Since both the cylindrical part and the non-cylindrical part of the container are gas permeable, even if the gas adsorption device is in an atmosphere containing a gas adsorbed by the gas adsorbent, the gas adsorbent adsorbs through the container. Since there is little penetration | invasion, deterioration of a gas adsorbent can be suppressed.

  The invention of the gas adsorption device according to claim 3 of the present invention is such that the partition walls in the invention of claim 1 or claim 2 are hardly gas permeable.

Here, the gas permeability, which is a property of low gas permeability, is small, and the gas permeability of a partition wall made of the material is 104 [cm ³ / m ² · day · atm] or less. More preferably, it is 103 [cm ³ / m ² · day · atm] or less.

  Specifically, metals such as copper, iron and aluminum, ethylene-vinyl alcohol copolymer, polyacrylonitrile, nylon 6, nylon 66, nylon 12, polybutylene terephthalate, polybutylene naphthalate, polyethylene terephthalate, polyethylene naphthalate , Polyvinylidene fluoride, polyvinylidene chloride, ethylene-tetrafluoroethylene copolymer, polytetrafluoroethylene, polyimide, polycarbonate, polyacetate, polystyrene, ABS, polypropylene, polyethylene, etc. It is not limited to.

  Since the partition wall is hardly permeable to gas, even if the gas adsorption device is in an atmosphere containing a gas that is adsorbed by the gas adsorbent, the gas adsorbent adsorbs less through the partition wall. Deterioration can be suppressed.

  The invention of the gas adsorption device according to claim 4 of the present invention is the invention according to any one of claims 1 to 3, wherein at least a part of at least one of the cylindrical part of the container and the partition wall. Is an elastic body.

  The elastic body is deformed substantially in proportion to the stress from the outside and returns to a normal state where no stress is applied when the stress stops working, and rubber or the like corresponds to this.

  Since at least a part of at least one of the cylindrical part or the partition of the container is an elastic body, if a disk-shaped partition slightly larger than the diameter of the cylindrical inner wall is provided on the inner wall of the cylinder, the cylindrical part of the container or Any one of the partition walls is deformed to eliminate a gap between the inner wall of the cylindrical portion of the container and the partition walls, and an excellent sealing property can be obtained.

  Therefore, even if the gas adsorbing device is in an atmosphere containing a gas adsorbed by the gas adsorbing material, deterioration of the gas adsorbing material due to the intrusion of gas outside the gas adsorbing device can be suppressed.

  Metals, plastics, and the like are elastically deformed with a slight strain, and thus are considered to be elastic bodies in a broad sense. However, materials having a large strain ratio with respect to stress are more desirable.

  Further, the adsorption device receives an external force in handling until it is installed in a vacuum device. Therefore, it is desirable that the container is small in deformation due to strain, and the partition is more preferably an elastic body.

  The invention of the gas adsorption device according to claim 5 of the present invention is such that the gas adsorbent according to any one of claims 1 to 4 is covered with a gas permeable packaging material. It is.

Here, the gas permeability is that having a gas permeability of 108 [cm ³ / m ² · day · atm] or more, but preferably 1010 [cm ³ / m ² · day · atm] or more.

  A wrapping material is a material in which fibers are knitted or accumulated with a binder to form a film or sheet, which is a continuous body from a macro viewpoint, but has innumerable through holes from a micro viewpoint. is there.

  Further, the packaging material may be formed into a bag shape and the gas adsorbing material may be included. At this time, the form of the bag may be a pillow bag, a gusset bag, or the like, but is not limited thereto. The packaging material does not have to be closed on all sides, and may have open sides.

  The pressure at which the partition wall separates from the cylindrical portion of the container varies depending on the manufacturing conditions of the gas adsorption device, the decompression conditions when the gas adsorption device is installed in a vacuum device, and the like. When this pressure is large, the gas suddenly flows into the cylindrical container from the external space of the gas adsorption device. If the gas adsorbent is powdery, there is a possibility that the gas adsorbent may be scattered by the rapidly flowing gas. However, scattering of the gas adsorbent can be suppressed by making the through hole of the packaging material smaller than the particle size of the gas adsorbent. In addition, when there is an open side in the packaging material, it is desirable to set the open side in a direction opposite to the opening of the cylindrical container.

  On the other hand, as shown above, since the gas permeability of the packaging material is very large, the continuity of the space through which the gas permeates is not hindered, and the adsorption characteristics of the gas adsorption device do not deteriorate.

  Gas permeable packaging materials include non-woven fabrics, gauze, wire mesh, etc., but are not limited to these, and are continuous from a macro perspective, and have many through holes from a micro perspective. If it is good.

  The invention of the gas adsorption device according to claim 6 of the present invention is the gas permeable partition between the partition wall and the gas adsorbent in addition to the invention according to any one of claims 1 to 5. It is what has.

Here, the gas permeability is that having a gas permeability of 108 [cm ³ / m ² · day · atm] or more, but preferably 1010 [cm ³ / m ² · day · atm] or more.

  The partition is divided into a plurality of spaces from a macro viewpoint, but is spatially connected from a micro viewpoint and has gas permeability.

  The partition is installed between the gas adsorbent and the opening of the cylindrical container so as to be in contact with the inner wall of the cylindrical container.

  The atmospheric pressure when the partition wall is separated from the cylindrical portion of the container varies depending on the manufacturing conditions of the gas adsorption device and the decompression conditions when the gas adsorption device is installed in the vacuum equipment. When this pressure is large, the gas suddenly flows into the cylindrical container from the external space of the gas adsorption device. If the gas adsorbent is powdery, there is a possibility that the gas adsorbent may be scattered by the rapidly flowing gas. However, the scattering of the gas adsorbent can be suppressed by making the through hole of the partition smaller than the particle diameter of the gas adsorbent.

  On the other hand, as shown above, since the gas permeability of the partition is very large, the continuity of the space through which the gas permeates is not hindered, and the adsorption characteristics of the gas adsorption device do not deteriorate.

  Gas permeable partitions include glass wool, plastic foam, non-woven fabric, wire mesh, etc., but are not limited to these, and are continuous from a macro perspective, and have many through holes from a micro perspective. If it is what is.

  The invention of the gas adsorption device according to claim 7 of the present invention is such that the container according to any one of claims 1 to 6 is covered with a gas-impermeable coating material. is there.

  By filling the inside of the covering material with a non-adsorbing gas with respect to the gas adsorbing material, the external space of the cylindrical portion of the container is filled with the non-adsorbing gas with respect to the gas adsorbing material. Therefore, there is a slight gap between the inner wall and the partition wall of the cylindrical portion of the container, and even if the gas in the closed space formed by these and the external space of the container cylindrical portion is exchanged, the gas adsorbent does not deteriorate. Therefore, the gas adsorption device can be left in the atmosphere for a long time.

The gas permeable coating material here is a coating material having a gas permeability of 104 [cm ³ / m ² · day · atm] or less, but is 102 [cm ³ / m ² · day · atm] or less. Is more desirable.

  Specifically, a plastic film or sheet such as an ethylene-vinyl alcohol copolymer, nylon, polyethylene terephthalate, or polypropylene is made into a bag, but is not limited thereto. Furthermore, it is desirable to laminate a metal foil on a plastic film or to further improve the gas barrier property by depositing a metal. Gold, copper, aluminum, or the like can be used as the metal foil or metal that can be used for vapor deposition, but is not limited thereto. In addition, since gas permeability is a value peculiar to a substance, since it may not satisfy said conditions as a coating | covering material, thickness is optimized and it satisfies the said conditions as a coating | covering material.

  The invention of the gas adsorption device according to claim 8 of the present invention is such that the opening of the container according to any one of claims 1 to 7 is sealed with a gas-impermeable film. is there.

  By filling the space between the film and the partition wall with a non-adsorptive gas with respect to the gas adsorbent, the outer space of the partition wall is filled with the non-adsorbable gas with respect to the gas adsorbent. Therefore, there is a slight gap between the inner wall of the cylindrical portion of the container and the partition wall, and even if the gas in the closed space formed by these and the space between the partition wall and the film is exchanged, the gas adsorbent does not deteriorate. Therefore, the gas adsorption device can be left in the atmosphere for a long time.

Here, the gas-impermeable film is formed by thinly molding a metal, plastic, or the like, and is a coating material having a gas permeability of 104 [cm ³ / m ² · day · atm] or less. The following is more desirable: cm ³ / m ² · day · atm].

  Specific examples include plastics such as ethylene-vinyl alcohol copolymer, nylon, polyethylene terephthalate, and polypropylene, but are not limited thereto. Further, it is desirable to laminate a metal foil on a plastic film or to deposit a metal to further improve the gas barrier property. Gold, copper, aluminum, or the like can be used as the metal foil or metal that can be used for vapor deposition, but is not limited thereto. In addition, since gas permeability is a value peculiar to a substance, since it may not satisfy said conditions as a sealing material, thickness is optimized and it satisfies the above-mentioned conditions as a sealing material.

  The sealing of the cylindrical portion of the container and the film can be performed by ultrasonic welding, adhesion with an epoxy resin, or the like, but is not limited thereto as long as gas permeation at the sealing portion can be suppressed. .

  Furthermore, since only the container opening is covered, a small amount of gas permeable film is required, and the cost can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this Embodiment.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a gas adsorption device under atmospheric pressure according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of a vacuum heat insulating material to which the gas adsorption device according to Embodiment 1 of the present invention is applied. FIG. 3 is a cross-sectional view of the gas adsorption device under reduced pressure according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the gas adsorption device 1 includes a cylindrical container 3 having an opening 2 at one end and a cylindrical container 3 in contact with the inner wall of the cylindrical part 3. A gas adsorbent 5 made of ZSM-5 type zeolite and a non-adsorbable gas 6 that is non-adsorbable to the gas adsorbent 5 are enclosed in a closed space surrounded by the cylindrical container 3 and the partition wall 4. It is what.

  As shown in FIG. 2, the vacuum heat insulating material 7 is obtained by covering the gas adsorption device 1 and the core material 8 with a jacket material 9 and sealing the inside of the jacket material 9 under reduced pressure.

  About the case where the gas adsorption device 1 comprised as mentioned above is applied to the vacuum heat insulating material 7, the operation | movement and an effect | action are demonstrated below.

  As shown in FIG. 1, a non-adsorbing gas 6 is enclosed in a closed space formed by a cylindrical container 3 and a partition wall 4, and the closed space is in a condition where the pressure of the non-adsorbing gas 6 and the atmospheric pressure are balanced. The volume of is determined. Further, since the partition wall 4 is made of rubber, the partition wall 4 is deformed into the same shape as the shape of the inner wall of the container, so that the sealing property between the cylindrical container 3 and the partition wall 4 is ensured. Accordingly, gas does not enter the closed space even under atmospheric pressure, and deterioration of the gas adsorbent 5 is suppressed. Furthermore, the relative positions of the cylindrical container 3 and the partition wall 4 are not fixed, and when the force in the length direction of the cylindrical container 3 is applied to the partition wall 4, it moves along the length direction of the cylindrical container 3. To do.

  Since the gas adsorbent 5 in the cylindrical container 3 adsorbs gas existing in the space outside the cylindrical container 3 under reduced pressure, it needs to be connected to the space outside the cylindrical container 3. This is achieved by the following process.

  First, when the gas adsorption device 1 is placed under atmospheric pressure, the pressure of the non-adsorbable gas 6 in the closed space inside the cylindrical container 3 and the partition wall 4 is balanced with the atmospheric pressure. When the atmosphere in which the gas adsorption device 1 is placed is depressurized, the pressure of the non-adsorbable gas 6 inside the closed space becomes larger than the pressure outside the closed space, and the pressure applied to the surface of the partition wall 4 on the closed space side; Since a difference is generated in the pressure applied to the outer space side surface of the partition wall 4, the partition wall 4 moves along the container 1 to the outer space side, that is, the opening 2 side, and the volume of the closed space increases. When the amount of substance is constant in the closed space, the partition 4 moves until the pressure inside and outside the closed space becomes the same. When the pressure is further reduced, the partition 4 further moves in the direction of the opening 2 of the cylindrical container 3, and the cylindrical container 3 and the partition 4 are separated.

  As shown in FIG. 3, when the cylindrical container 3 and the partition wall 4 are separated, the external space of the gas adsorption device 1 and the gas adsorbent 5 are connected through the opening 2, and gas can be adsorbed.

  The vacuum heat insulating material 7 is formed by inserting the gas adsorbing device 1 and the core material 8 into a jacket material 9 that has been sealed in three directions in advance to be placed in a vacuum chamber, decompressed, and unsealed. It is manufactured by sealing the part by thermal welding.

  Under reduced pressure, the volume of the closed space surrounded by the cylindrical container 3 and the partition wall 4 is calculated as follows.

According to Boyle-Charles' law, the product of gas volume and pressure in a closed space is constant,
The volume of the closed space under atmospheric pressure × atmospheric pressure = the volume of the closed space under reduced pressure × the pressure under reduced pressure. Therefore, the volume of the closed space under reduced pressure is as follows.

Volume of closed space under reduced pressure = Volume of closed space under atmospheric pressure / (Pressure under reduced pressure / Atmospheric pressure)
Under static conditions, the pressure when the partition 4 reaches the opening 2 is a pressure at which the gas adsorbent 5 is connected to the external atmosphere. Therefore, the following relationship holds.

Volume of cylindrical container 3 / volume of closed space under atmospheric pressure = atmospheric pressure / pressure at which gas adsorbent 5 is connected to the external atmosphere
The pressure at which the gas adsorbent 5 is connected to the external atmosphere = the volume of the closed space / the volume of the cylindrical container 3 under the atmospheric pressure × atmospheric pressure.

  As a result, the following can be seen. The pressure at which the gas adsorbent 5 is connected to the external atmosphere is proportional to the ratio of the volume of the closed space under the atmospheric pressure to the cylindrical container 3. These can be controlled when the gas adsorption device 1 is designed, and by optimizing them, the pressure at which the gas adsorbent 5 is connected to the external atmosphere can be controlled.

(Embodiment 2)
FIG. 4 is a cross-sectional view of a gas adsorption device according to Embodiment 2 of the present invention.

  As shown in FIG. 4, in the gas adsorption device 1, the gas adsorbent 5 is covered with a packaging material 10, and the cylindrical container 3 is covered with a covering material 11. In FIG. 4, the wrapping material 10 is a non-woven fabric, and the covering material 11 is formed by thermally welding a plastic laminate film. The low-density polyethylene films laminated in this order of low-density polyethylene, aluminum foil, and nylon are opposed to each other. The four sides are thermally welded to separate the inner and outer spaces of the covering material 11.

  Since the covering material 11 includes an aluminum foil, the gas permeability is very small, and the gas entering the inside of the covering material 11 is extremely small. Therefore, even if the gas adsorption device 1 is left in the atmosphere for a long time, the deterioration of the gas adsorbent 5 is extremely small, and the original adsorption characteristics can be obtained.

  Furthermore, when the inside of the cylindrical container 3 is depressurized, the gas around the gas adsorbent 5 passes through the packaging material 10 and is discharged to the outside of the cylindrical container. When this discharge speed is high, the gas adsorbent 5 may be scattered, but the gas adsorbent 5 does not scatter because it stays inside the packaging material 10.

  When this gas adsorbing device 1 is applied to the vacuum heat insulating material 7, the gas adsorbing material 5 is not scattered inside the jacket material, and the vacuum heat insulating material 7 can be easily recycled.

  In addition, in order to express the function of the gas adsorption device 1 in this Embodiment, it is used after breaking and removing the coating | covering material 11 in the case of use. The operation of the gas adsorption device 1 under reduced pressure is the same as that of the first embodiment.

(Embodiment 3)
FIG. 5 is a cross-sectional view of a gas adsorption device according to Embodiment 3 of the present invention.

  As shown in FIG. 5, in the gas adsorption device 1, a partition 12 is installed between the gas adsorbent 5 and the partition wall 4, and the gas permeation of the opening 2 is suppressed by the seal 13. Yes. The partition 12 is made of glass wool. The seal 13 is a plastic laminate film, which is laminated in the order of nylon, aluminum foil, and nylon. The seal 13 is attached to the cylindrical container 3 with an epoxy resin to separate the space inside and outside the cylindrical container 3.

  Since the seal 13 includes an aluminum foil, the gas permeability is very small and the amount of gas entering the coating material 11 is extremely small. Therefore, even if the gas adsorption device 1 is left in the atmosphere for a long time, the deterioration of the gas adsorbent 5 is extremely small, and the original adsorption characteristics can be obtained.

  Furthermore, when the inside of the cylindrical container 3 is depressurized, the gas around the gas adsorbent 5 passes through the partition 12 and is discharged to the outside of the cylindrical container 3. When this discharge speed is high, the gas adsorbent 5 may be scattered, but the gas adsorbent 5 stays inside the partition 12 and therefore does not scatter.

  When this gas adsorbing device 1 is applied to the vacuum heat insulating material 7, the gas adsorbing material 5 is not scattered inside the jacket material, and the vacuum heat insulating material 7 can be easily recycled.

  In addition, in order to express the function of the gas adsorption device 1 in this Embodiment, it uses, after removing the seal | sticker 13 in the case of use. The operation of the gas adsorption device 1 under reduced pressure is the same as that of the first embodiment.

  Examples of the present invention will be described below.

(Example 1)
The volume of the cylindrical container was 10 ml, and the gas adsorbing device produced with the volume of the closed space under atmospheric pressure being 1 ml was placed in a vacuum chamber to confirm the operation. The inside of the vacuum chamber was depressurized from atmospheric pressure to 100 Pa over 3 minutes.

  The pressure at which the gas adsorbent is connected to the external atmosphere is 101.3 hPa when the pressure is statically reduced. However, since the pressure reduction is performed at a finite speed, the pressure at which the gas adsorbent 5 is connected to the external atmosphere is smaller than this value and 300 Pa. Met.

  As described above, when the pressure is reduced at a finite speed, a deviation from the theoretical value of the static condition occurs. This deviation is caused by the following mechanism. Since the cylindrical container and the partition wall are in close contact with each other, it takes time for the partition wall to start moving even when a force is applied in the length direction of the cylindrical container 3. Therefore, when the partition wall 4 reaches the opening 2 of the cylindrical container, it is after the time has passed since reaching 300 hPa, and since the pressure reducing process continues during this time, the pressure is further reduced from 300 hPa. Because. Here, the static condition is a condition in which the relationship between the volume of the closed space and the external atmospheric pressure coincides with the theory by changing the pressure very slowly.

  As described above, when the pressure is reduced at a finite speed, the pressure at which the gas adsorbent is connected to the external space is lower than the theoretical value in the case of static conditions. Accordingly, the deterioration of the gas adsorbent can be further reduced.

(Example 2)
The volume of the cylindrical container was 10 ml, and the gas adsorbing device produced with the volume of the closed space under atmospheric pressure being 1 ml was placed in a vacuum chamber to confirm the operation. The inside of the vacuum chamber was depressurized from atmospheric pressure to 100 Pa over 60 minutes. In this case, the pressure at which the gas adsorbent was connected to the external atmosphere was 100.1 hPa, which was almost as theoretical. This is because the depressurization rate is very small and the conditions corresponding to the static depressurization step are achieved.

(Example 3)
In this example, the cylindrical container was covered with a covering material laminated in the order of nylon-aluminum foil-nylon. When the adsorption characteristics of the gas adsorbent were evaluated one month after the production of the gas adsorption device, no deterioration in adsorption capacity was observed. This is because the gas does not enter the cylindrical container because it is covered with the covering material.

  As described above, the gas adsorption device according to the present invention can handle a highly active gas adsorbent without deteriorating under atmospheric pressure.

Sectional drawing of the gas adsorption device under atmospheric pressure in Embodiment 1 of this invention Sectional drawing of the vacuum heat insulating material which applied the gas adsorption device in Embodiment 1 of this invention Sectional drawing of the gas adsorption device under reduced pressure in Embodiment 1 of this invention Sectional drawing of the gas adsorption device in Embodiment 2 of this invention Sectional drawing of the gas adsorption device in Embodiment 3 of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas adsorption device 2 Opening part 3 Cylindrical container 4 Partition 5 Gas adsorbent 6 Non-adsorbable gas 10 Packaging material 11 Covering material 12 Partition 13 Sealing

Claims (8)

  A gas adsorbent and the gas in a closed space surrounded by the container and the partition wall, the container having at least one part having an opening at one end and a partition wall in contact with the inner wall of the tube portion of the container; A gas adsorption device in which a non-adsorbable gas that is non-adsorbable to an adsorbent is enclosed.   The gas adsorption device according to claim 1, wherein both the cylindrical portion and the non-cylindrical portion of the container are hardly gas permeable.   The gas adsorbing device according to claim 1, wherein the partition walls are hardly gas permeable.   The gas adsorption device according to any one of claims 1 to 3, wherein at least a part of at least one of the cylindrical portion and the partition wall of the container is an elastic body.   The gas adsorption device according to any one of claims 1 to 4, wherein the gas adsorbent is covered with a gas-permeable packaging material.   The gas adsorption device according to any one of claims 1 to 5, further comprising a gas permeable partition between the partition wall and the gas adsorbent.   The gas adsorption device according to any one of claims 1 to 6, wherein the container is covered with a gas-impermeable coating material.   The gas adsorption device according to any one of claims 1 to 7, wherein the opening of the container is sealed with a gas-impermeable film.