JP2009168202A - Vacuum heat insulation box body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum heat insulation box body which uses a gas adsorption device capable of maintaining adsorption performance of a gas adsorbent till use. <P>SOLUTION: The gas adsorption device 1 which is disposed with a core material 16 within a space 17 formed between an outer box 14 and an inner box 15 comprises a container consisting of the gas adsorbent, a moisture adsorbent and a gas permeability retardant element. The container is configured so that the interior is partitioned into at least two or more accommodation spaces by a partition capable of adjusting permeability. The gas adsorbent and the moisture adsorbent are accommodated in different accommodation spaces of the containers. The vacuum heat insulation box body is configured so as to have a through-hole at predetermined temperature rise in the container which forms the accommodation space in which the moisture adsorbent is accommodated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vacuum heat insulation box having a vacuum double wall structure.

  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 and vacuum heat insulating boxes 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 poor gas permeability 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.

  The vacuum insulation material inserts the core material into a gas-permeable outer jacket material and seals the inside by reducing the pressure. Therefore, the outer shell material is compressed in the atmosphere and conforms to the shape of the core material serving as a spacer. It sticks in the shape of When the shape of the core material is complicated due to unevenness or bending, it becomes difficult to insert the core material into the outer cover material. It is difficult to seal under reduced pressure following unevenness and bending.

  If molding does not follow, there is no point in giving shape to the core material, wrinkles on the outer cover material, floating without adhering to the core material, local stress is easily applied to the outer cover material, and the core The portion not in close contact with the material is easily damaged by a slight external force. Therefore, a general vacuum heat insulating material has a flat plate shape.

  In addition, it has followability to gentle unevenness and bending, and it can be bent or deformed after it is made into a flat plate shape. Likely to occur.

  Therefore, the outer cover material is molded into the necessary unevenness, bending, and shape in advance, and the core material is inserted into a gas-permeable low-permeability box body that does not undergo major deformation due to atmospheric compression and sealed under reduced pressure. A thing is distinguished from a vacuum heat insulating material, and it is set as a vacuum heat insulation box. If it is this method, the vacuum heat insulating material (vacuum heat insulation box) which has the unevenness | corrugation and bending more complex than a vacuum heat insulating material, and a box shape can be produced.

  Moreover, although it is called a vacuum heat insulation box, it is not necessarily required to be a box shape, and it may be characterized in that the outer jacket material has a strength that does not greatly deform due to atmospheric compression. It doesn't matter. For example, a pipe shape, a shape having irregularities on a flat plate, a bottle shape, or a spherical shape may be used.

  Next, the gas existing inside the vacuum heat insulating material or the vacuum heat insulating box is roughly divided into the following three types. One is the gas that remains without being exhausted when the vacuum heat insulating material or the vacuum heat insulating box is manufactured, and the other is the gas (core material or The gas adsorbed on the jacket material or the reaction gas generated by the reaction of the unreacted components of the core material, etc., and the other one passes through the jacket material and enters from the outside. It is a gas.

  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.

On the other hand, there exists patent document 2 as an example of a vacuum heat insulation box. In Patent Document 2, in a vacuum heat insulation box body in which a foam heat insulating material is filled between an outer box and an inner box of a refrigerator or the like, an open cell rigid polyurethane foam is used for the foam heat insulating material, and a heat insulating wall is used for the outer box. There is a vacuum heat insulating box which is provided with a vacuum indicator and an opening / closing valve communicating with the inside, and vacuum deaerated through the opening / closing valve. Since the vacuum level inside the heat insulation wall can be monitored by the vacuum indicator, even if the vacuum level deteriorates due to gas entering from outside or gas remaining inside, by vacuum degassing through the open / close valve, The initial thermal insulation performance can be restored.
Japanese National Patent Publication No. 9-512088 JP-A-7-148752

  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 gas adsorption capacity is consumed in the manufacturing process in 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.

  The height of activity of the gas adsorbent, that is, the time until the adsorption is saturated when left in the atmosphere varies depending on the form and material specifications. For example, if the gas adsorbent is in the form of pellets, it will not saturate even if left in the atmosphere for a relatively long time. On the other hand, if the gas adsorbent is in powder form, the specific surface area becomes large, so that even if it is left in the atmosphere for a short time, it is saturated.

  Therefore, in the above structure, when a powdery gas adsorbent is used, which has a higher activity than Ba-Li, there is a possibility that the time that can be contacted with the atmosphere will be very short.

  Moreover, in the said conventional structure, in order to suppress deterioration by the water | moisture content of a gas adsorbent, it has the structure which covers a gas adsorbent with a drying material (moisture adsorbent). As a result, the thickness of the gas adsorbent and the device (gas adsorbing device) that assists in maintaining and expressing the function of the gas adsorbent becomes larger than the sum of the thickness of the gas adsorbent and the moisture adsorbent.

  On the other hand, one of the features of the vacuum heat insulating material is that heat insulating performance can be obtained with a thinner thickness than other heat insulating materials. When the gas adsorbent having the above-described conventional configuration is applied to the vacuum heat insulating material, the lower limit of the thickness of the vacuum heat insulating material is the thickness of the gas adsorbing device, so that it is difficult to reduce the thickness of the vacuum heat insulating material. The same can be said for the vacuum heat insulation box.

  Further, in the configuration of Patent Document 2, in the vacuum heat insulating box, the gas that has entered from the outside and the gas generated from the inside are reduced again through the valve. The resistance is large and it takes a very long time to decompress.

  In Patent Document 2, open-celled rigid polyurethane foam is used as a core material. However, if it is a powder such as dry silica (having improved heat insulation performance) having a finer particle size, the exhaust resistance is further increased. The mechanical vacuum pump cannot easily reduce the pressure and requires a considerable time for the pressure reduction process.

  For this improvement, a gas adsorbent is included, and with a mechanical vacuum pump, the pressure is reduced to the extent of roughing that is possible in a short time, and after sealing, the production process such as the storage period and transport period In a different flow, it is preferable to have a chemical vacuum pump function for adsorbing the remaining air with a gas adsorbent.

  For this purpose, gas adsorption with high activity, large adsorption capacity, and excellent handling properties is required to remove the residual air from the vacuum insulation box that has a high exhaust resistance such as dry silica and has a large exhaust volume. A device is required.

  In particular, although it is highly active and cannot be handled in the air, the gas adsorption capacity must be developed after roughing, but since it is inserted into the vacuum heat insulation box, the gas adsorption capacity is developed. I can't control it. In addition, since the jacket material has a certain strength, it is difficult to develop the adsorption ability by an external stress.

  The conventional Ba-Li has an advantage that it can be handled in the air for use as a chemical vacuum pump, but its activity is low, so that the amount used is increased and it takes time to depressurize. Moreover, since the solid thermal conductivity of Ba-Li itself is high, the heat insulation performance of a vacuum heat insulation box will also fall if the usage-amount increases.

  The present invention solves the above-mentioned conventional problems, and a vacuum heat insulating box using a gas adsorption device capable of maintaining the adsorption performance of the gas adsorbent until it is used even if the highly active gas adsorbent is in powder form The purpose is to provide a body.

  Furthermore, it aims at providing the vacuum heat insulation box which makes the thinning easy when applied to a thin apparatus.

  It is another object of the present invention to provide a vacuum heat insulating box that expresses a gas adsorbent of a highly active gas adsorbent at a necessary timing in order to develop a chemical vacuum pump function and shorten the manufacturing process.

  In order to achieve the above object, the vacuum heat insulation box of the present invention comprises an outer box and an inner box each made of a gas permeable material, a core material, and a gas adsorption device, and the outer box and the inner box. The core material and the gas adsorbing device are arranged in a space formed between the two, and the vacuum is formed by exhausting the air in the space from an exhaust port provided in the outer box and sealing the space under reduced pressure. A vacuum heat insulation box having a heavy wall structure, wherein the gas adsorbing device comprises a gas adsorbing material, a moisture adsorbing material, and a container made of a gas-impermeable material, and the inside of the container regulates air permeability. The gas adsorbing material and the moisture adsorbing material are respectively accommodated in different accommodating spaces of the container.

  As a result, since the gas adsorbent and the moisture adsorbent are housed in a container made of a gas-impermeable material, the inside of the container and the atmosphere outside the container can be shut off and stored for a long time even if highly active. It becomes possible.

  Further, if at least two or more spaces partitioned by the partitions are arranged in a direction substantially perpendicular to the thickness direction of the accommodating space for accommodating the gas adsorbing material or the moisture adsorbing material, the thickness of the gas adsorbing device. Is almost equal to the thicker of the space containing the gas adsorbent or the space containing the water adsorbent, so the gas adsorption device can be easily made thinner and the vacuum insulation box can be made thinner. Can be realized.

  Furthermore, the gas adsorbing device prevents the formation of a through-hole in the container forming the accommodation space in which the moisture adsorbing material is accommodated until the gas adsorbing device is made of a thermoplastic material and is softened. The control member that prevents the gas outside the container from being adsorbed and the control member before being softened continue to pierce the control member with a force that does not penetrate the control member. A through hole is formed in the container forming the accommodation space in which the control member and the moisture adsorbing material are accommodated by deforming the control member with the piercing force with respect to the control member softened due to temperature rise. It is preferable to have an opening member.

  Thereby, by raising the temperature of the gas adsorption device, the accommodation space for accommodating the gas adsorbent and the space in which the core material is arranged can be communicated. There is no need to control factors, and productivity can be improved. In addition, even when it is difficult to apply force from the outside of the vacuum heat insulation box, it is necessary to select the timing to develop the adsorption capacity even when it is difficult to apply force from the outside of the vacuum heat insulation box, as the outer jacket material has a strength that does not greatly deform due to atmospheric compression. It becomes possible to do.

  Since the gas adsorbent is highly active against moisture, it is deactivated by adsorbing moisture when adsorbing gas, but by using the moisture adsorbent together, the gas around the gas adsorbent The moisture contained in can be reduced. By making the moisture adsorbent communicate with the outside air, the outside air component first contacts the moisture adsorbent, so it adsorbs moisture in the air and then flows to the gas adsorbent, preventing deterioration of the gas adsorbent due to moisture. can do. Thereby, the deactivation due to moisture is reduced, and the characteristics of the gas adsorbent can be fully exhibited.

  In addition, since the gas adsorbent and the moisture adsorbent are accommodated in the independent accommodating space, at least two or more accommodating spaces partitioned by the partition are in the thickness direction of the accommodating space for accommodating the gas adsorbent or the moisture adsorbent. If the gas adsorbing devices are arranged in a substantially vertical direction, the thickness of the gas adsorbing device becomes substantially equal to the thicker one of the accommodating space for accommodating the gas adsorbing material and the accommodating space for accommodating the moisture adsorbing material.

  Therefore, a thin gas adsorption device can be obtained by thinning the gas adsorbent and the moisture adsorbent accommodated in the accommodating space. The dimensions, especially the thickness, of the vacuum insulation box depends on the thickness of the gas adsorption device.

  Therefore, it can contribute to the thinning which is the advantage of a vacuum heat insulation box. Further, it is possible to use gas adsorbents having various activities by adjusting the air permeability of the partition according to the activity of the gas adsorbent.

  In addition, a member that creates a through hole in the container of the gas adsorption device may be controlled by a control member made of a thermoplastic material and heated to soften the control member, thereby causing a through hole in the container. Even if it is a vacuum heat insulation box which has a certain strength in the box and cannot be pierced from the outside, the adsorption ability can be expressed.

  In addition, by using such a gas adsorption device as a chemical vacuum pump for increasing the initial degree of vacuum in a vacuum heat insulation box using a core material having a fine particle size with high exhaust resistance, the evacuation time can be reduced. Even when outside air enters, the degree of vacuum can be maintained by adsorbing the gas adsorbing material, and high reliability can be obtained.

  Further, when the chemical vacuum pump function is used, the amount of adsorbed gas is increased, so that the moisture content is also increased. For this reason, the desorption amount of the gas adsorbent due to moisture also increases and the gas adsorption capacity decreases, but since the outside air component comes into contact with the moisture adsorbent first by connecting the moisture adsorbent to the outside air, it is almost lost. The characteristics of the gas adsorbent can be fully exhibited without being activated.

  The invention of the vacuum heat insulation box according to claim 1 of the present invention comprises an outer box and an inner box each made of a gas permeable material, a core material, and a gas adsorption device, and the outer box and the inner box. The core material and the gas adsorbing device are arranged in a space formed between the two, and the vacuum is formed by exhausting the air in the space from an exhaust port provided in the outer box and sealing the space under reduced pressure. A vacuum heat insulation box having a heavy wall structure, wherein the gas adsorption device is composed of a gas adsorbent, a moisture adsorbent, and a gas permeable material, and the inside of the container regulates air permeability. The gas adsorbing material and the moisture adsorbing material are respectively accommodated in different accommodating spaces of the container.

  In general, a gas adsorbent has a property of easily adsorbing moisture. For this reason, when the gas around the gas adsorption device contains moisture, the adsorption capacity of the gas is reduced by adsorbing moisture.

  Even when the gas around the gas adsorbing device contains moisture, it is possible to obtain a necessary air adsorbing amount by increasing the amount of the gas adsorbing material accommodated in the gas adsorbing device. However, gas adsorbents are generally more expensive than moisture adsorbents. Therefore, adsorbing moisture that can be adsorbed by the moisture adsorbing material with the gas adsorbing material is not a good idea from the viewpoint of cost.

  For this reason, it is possible to reduce the cost of the gas adsorption device by adsorbing moisture with the moisture adsorbent and adsorbing gas with the gas adsorbent. Further, the gas adsorbent has a higher rate of adsorbing moisture than the moisture adsorbent. Therefore, when these adsorbents are mixed in a gas containing moisture, the gas adsorbent adsorbs a large amount of moisture, and the purpose of suppressing moisture adsorption by the gas adsorbent is not achieved.

  In order to achieve this object, the arrangement of the container for containing the adsorbent and the adsorbent in the container is optimized. For this reason, the gas adsorbent and the moisture adsorbent are accommodated in independent accommodation spaces. Moreover, the independent accommodation spaces ensure appropriate air permeability.

  Furthermore, when the gas outside the gas adsorption device is adsorbed, the gas passes through the accommodation space containing the moisture adsorbent, the contained moisture is adsorbed, and the accommodation space containing the gas adsorbent becomes a gas with less moisture. To reach.

  At this time, if the air permeability between the accommodation spaces is too large, the moisture adsorbing material cannot absorb moisture, and a gas containing a large amount of moisture reaches the gas adsorbing material. On the other hand, when the air permeability between the accommodation spaces is too small, the gas does not reach the gas adsorbent, and the adsorption performance of the gas adsorbent cannot be expressed. Therefore, said objective is achieved by adjusting the air permeability of accommodation space.

  In order to reduce the thickness of the gas adsorption device, it is effective to accommodate the gas adsorbent and the moisture adsorbent in parallel. The gas adsorbing material and the moisture adsorbing material are accommodated in independent accommodating spaces, respectively, and at least two or more accommodating spaces partitioned by the partition are substantially in the thickness direction of the accommodating space for accommodating the gas adsorbing material or the moisture adsorbing material. If the gas adsorption devices are arranged in the vertical direction, the thickness of the gas adsorption device becomes substantially equal to the thicker one of the accommodation space for accommodating the gas adsorption material and the accommodation space for accommodating the moisture adsorption material.

  Therefore, adjusting the thickness of the gas adsorbing device by adjusting the maximum thickness of the gas adsorbent and the moisture adsorbent (or the adsorbent containing the gas adsorbent or the moisture adsorbent) accommodated in the accommodating space. Can do. By applying the thinned gas adsorption device, it is possible to thin the vacuum heat insulating box (wall thickness).

  Also, the higher the activity of the gas adsorbent and the greater the specific surface area, the more severe the handling conditions. That is, in order to maintain the activity of the gas adsorbent, the time that can be contacted with air is shortened, and the pressure that can be contacted is also reduced.

  Therefore, such a gas adsorbing material also has a problem of deterioration when installed in a vacuum heat insulating box in addition to during storage. Therefore, when the gas adsorbent is installed in the vacuum heat insulation box, it is necessary to communicate after the space in which the gas to be adsorbed, that is, the pressure inside the vacuum heat insulation box becomes as low as possible.

  When applying a gas adsorbent to a vacuum insulation box, insert a core material and a gas adsorbent into a gas-impermeable outer jacket (outer box and inner box), depressurize from the exhaust port, After depressurizing the inside (the space formed by the outer box and the inner box), the exhaust port is sealed.

  At this time, the pressure is reduced by a mechanical vacuum pump. In the normal pressure region, that is, before vacuum sealing, the pressure can be reduced by either a pump or an adsorbent. On the other hand, in the low pressure region, that is, inside the jacket material after vacuum sealing, there is a gas that could not be decompressed by the vacuum pump, a gas that penetrates through the jacket material after vacuum sealing, and a gas generated from the core material, These can be adsorbed only with a gas adsorbent. Therefore, in order to fully demonstrate the ability of the gas adsorbent inside the jacket material after vacuum sealing (the space formed by the outer box and inner box), it is necessary to communicate with the outside after vacuum sealing. It is.

  These requirements are achieved by accommodating the gas adsorbent in a container made of a gas-impermeable material, because it is necessary to suppress contact with the gas until it is installed in the vacuum heat insulation box.

  Furthermore, since communication is performed after sealing the vacuum heat insulation box, if a gas that is difficult to adsorb with the gas adsorbent is present in the gas adsorption device, it remains in the vacuum heat insulation box after vacuum sealing. Therefore, the inside of the gas adsorption device needs to be evacuated in advance, and the pressure is desirably 100 Pa or less.

  Here, the container is one that divides the space into the inside and outside like a spherical shell, for example.

The gas permeable material is a material having a gas permeability of 10 ⁴ [cm ³ / m ² · day · atm] or less, and more preferably 10 ³ [cm ³ / m ² · day · atm] or less. Is.

Further, the moisture adsorbing material is capable of adsorbing moisture contained in the gas, and includes CaO, CaCl ₂ , SiO ₂ , NaOH, KOH, P ₂ O ₅ , anhydrous Na ₂ SO ₄ , magnesium perchlorate, activated carbon. Etc.

  Gas adsorbents are those that can adsorb non-condensable gas contained in gas, and alkali metal and alkaline earth metal oxides, alkali metal and alkaline earth metal hydroxides, etc. can be used, In particular, there are lithium oxide, lithium hydroxide, barium oxide, barium hydroxide, and the like.

  The partition in the present invention adjusts the air permeability between the spaces, and a tubular member, an open-cell porous body, or the like can be used.

  The term “communication” means that gas can pass through the space inside the container and the space outside the container by forming a through hole in the container of the gas adsorption device.

  Also, if the air permeability of the partition between the storage space for storing the gas adsorbing material and the storage space for storing the water adsorbing material is too large, the water adsorbing material cannot fully absorb the water, the water reaches the gas adsorbing material, The moisture adsorbent will deteriorate. On the other hand, when the air permeability of the partition between the storage space for storing the gas adsorbent and the storage space for storing the moisture adsorbent is too small, the gas does not reach the gas adsorbent and exhibits the adsorption characteristics of the gas adsorbent. It becomes difficult.

  Partition permeability depends on gas permeability, cross-sectional area, and length. When the gas adsorption device is covered with the soft packaging material, atmospheric pressure is applied to the gas adsorption device. When the container of the gas adsorbing device is a soft wrapping material, atmospheric pressure is applied to the partition connecting the accommodation spaces, and if deformation or the like occurs, the cross-sectional area of the accommodation space decreases, and the gas permeability decreases. Therefore, a spacer for maintaining the cross-sectional area of the accommodation space against the atmospheric pressure is required. Therefore, by using a continuous porous body as a partition, the bulk portion functions as a spacer and the void portion functions as a partition through which gas passes, so that these conditions can be satisfied.

  The member used as the continuous porous body may be an aggregate of particles made of an inorganic material, such as ceramics, as long as the void volume can be maintained against atmospheric pressure and the voids communicate with each other. An organic substance such as a continuous urethane foam may be used, but one with less gas generation is more desirable.

  Moreover, there is a nonwoven fabric as a typical continuous porous body, and it has excellent air permeability. Moreover, the compression rate when pressure is applied can be adjusted by selecting an appropriate material and manufacturing method.

  Here, the nonwoven fabric is a fibrous structure and is formed by bonding or entanglement between fibers by a mechanical bonding method, a chemical bonding method, or a combination thereof.

  The fiber used as the material for the nonwoven fabric is not particularly specified, and cotton, rayon, glass fiber, polypropylene, polyester, nylon, vinylon, carbon fiber, or the like can be used. Further, the form of the fiber is not limited to either short fiber or long fiber, and any fiber can be used. The production method is not particularly specified, and any method such as a water flow bonding method, a thermal bond, a spun bond, a needle punch, a wet method, a chemical bond, and a stitch bond can be used.

  Moreover, since the nonwoven fabric does not go through the process of weaving like a cloth during the manufacturing method, it can be obtained at a low cost. By using this, a gas adsorption device can be obtained at a low cost. Furthermore, since the non-woven fabric has a high degree of freedom in shape with respect to the bending force, if the container of the gas adsorption device is a soft packaging material, the degree of freedom in bending of the gas adsorption device is also increased and can be used for more general purpose applications. .

  Moreover, paper is a typical continuous porous body, and excellent compression resistance can be obtained by selecting an appropriate one. In addition, by selecting an appropriate material and manufacturing method, the compression ratio when pressure is applied can be adjusted more precisely. Therefore, even when a gas adsorbent having higher activity is used, deterioration due to moisture can be suppressed while sufficiently exhibiting adsorption characteristics.

  Here, the paper is a sheet formed by entwining vegetable fibers. Since paper does not go through a process of weaving like a cloth during its production process, it can be obtained at a low cost. By using this, a gas adsorption device can be obtained at a low cost. Furthermore, since the degree of freedom in shape of the paper with respect to the bending force is large, if the container of the gas adsorbing device is a soft packaging material, the degree of freedom in bending of the gas adsorbing device is also increased and can be used for more general purpose applications. .

  Here, the soft wrapping material is easily deformed by an external force and follows the shape of the housed member, and a plastic laminate film or the like corresponds to this. The gas permeability is air permeability per unit cross-sectional area and unit length.

  The plastic laminate film has a large shape flexibility with respect to the bending force. Therefore, by using the plastic laminate film as a container, the degree of freedom in shape with respect to the bending force of the gas adsorption device is increased. Furthermore, by laminating the aluminum foil, excellent gas permeability can be obtained, and the gas adsorbent can be stored for a long period of time.

  The moisture adsorbent is preferably in the form of powder. When the moisture adsorbing material is in a powder form, the surface area per unit weight is increased. For this reason, it becomes possible to adsorb | suck surrounding water | moisture content earlier. Therefore, it is easy to design a partition that connects the space for accommodating the gas adsorbent and the moisture adsorbent.

  This is for the following reason. In order to reduce moisture adsorption leakage by the moisture adsorbing material, the air permeability of the partition connecting the accommodating space containing the gas adsorbing material and the accommodating space containing the moisture adsorbing material must be smaller than a certain value. This is to ensure the time for the gas containing moisture to remain in the accommodation space containing the moisture adsorbing material, and this time can be shortened as the rate at which the moisture adsorbing material adsorbs moisture is increased. .

  This means that the air permeability of the partition connecting the accommodation space in which the gas adsorbent is accommodated and the accommodation space in which the moisture adsorbent is accommodated can be increased. Therefore, more gas outside the gas adsorption device can be adsorbed per unit time, and the gas adsorption device can be used for applications that need to increase the gas adsorption rate.

  Here, the powder form has an average particle diameter of 50 μm or less, and preferably has an average particle diameter of 10 μm or less.

  In addition, the gas-impermeable material that constitutes the vacuum heat insulation box is not limited, but metal foil such as stainless steel and iron, glass material, and resin material are inserted with AL foil laminate film and AL vapor deposition laminate film. Molded materials, resin materials deposited and coated with inorganic materials such as silica, diamond-like carbon and alumina, ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, MX nylon, polyvinyl alcohol, etc. There are functional resins.

  Further, the core material is not limited, and there are glass fiber, organic fiber such as polyester, inorganic powder such as silica, continuous urethane, etc., although it varies depending on the application and use conditions.

  Moreover, the invention of the vacuum heat insulation box of Claim 2 forms the said accommodation space in which the said moisture adsorption material is accommodated until it softens and consists of a thermoplastic material in the invention of Claim 1. A control member that prevents a through-hole from being formed in the container and prevents the gas adsorbent from adsorbing gas outside the container and the control member before being softened do not penetrate the control member. With respect to the control member that has continued to apply a piercing force to the control member with a certain level of force and has been softened at a predetermined temperature rise, the control member and the moisture adsorbing material are accommodated by deforming the control member with the piercing force. And a member that opens a through hole in the container forming the accommodation space.

  The vacuum heat insulating box has a certain strength in order to impart a shape such as unevenness to the gas permeable material constituting the inner box and the outer box. Therefore, once the gas adsorption device is inserted into the space between the inner box and the outer box and sealed under reduced pressure, it becomes difficult to express the gas adsorption ability from the outside. However, with this configuration, by increasing the temperature of the gas adsorbing device, the accommodation space for accommodating the gas adsorbing material and the space in which the core material is disposed can be communicated with each other. Even when the gas-impermeable material has a certain strength, gas adsorption ability can be expressed. Furthermore, when gas adsorption ability is expressed, it is not necessary to control factors other than temperature, and productivity can be improved.

  Further, when adsorbing gas outside the gas adsorption device, the gas passes through the accommodation space containing the moisture adsorbing material, the contained moisture is adsorbed, and the accommodation space containing the gas adsorbing material becomes a gas with less moisture. To reach.

  As a method of switching due to temperature change, a member that applies a piercing force in advance, and a piercing force is applied to a jacket material (container) containing a gas adsorbent with a jacket material made of a gas-impermeable material. A member that creates a through hole such as a needle is provided in the member that applies the piercing force, and a control member that is made of, for example, resin and prevents the through hole from being formed before softening is provided at the end of the member. deep.

  Then, although the strength of the control member is superior in a low temperature state, the control member does not penetrate, but the control member is softened and deformed by the temperature rise of the vacuum equipment, so that a through-hole can also be generated in the jacket material (container). At this time, since the vacuum equipment itself is highly heat insulating, the gas adsorption device is closer to the heating surface, the penetration time can be shortened, and the penetration means and the penetration control means are particularly The one closer to the heating surface can shorten the penetration time.

  The thermoplastic material is more easily deformed by the same piercing force as the temperature rises. Examples of materials that satisfy these conditions include metals, glass, and resins.

  The member that applies the piercing force is a member that constantly applies a force to the jacket material (container) without applying an external force by setting it to a predetermined state. These means apply a force to the jacket material (container) by the law of reaction by applying deformation to the elastic body and hindering the outer shell material from attempting to return the deformation.

  For example, this corresponds to enclosing a compression spring in a compressed state in a jacket material (container) having a finite size. The compression spring applies a piercing force to the jacket material (container) by trying to be long, and becomes a piercing force to the control member and the jacket material (container).

  The softening here means that the strength of the control member is lowered and a through hole can be generated. Therefore, the softening temperature of glass, the softening temperature of resin, and the like may be different from the normally defined temperatures. Accordingly, the softening temperature is not unique depending on the substance, and is determined in consideration of the piercing force applied to the control member.

  That is, when the piercing force applied to the control member is large, even if the strength of the control member is large, it can be deformed to generate a through-hole, so the softening temperature is lower than the normally defined temperature. When the force applied to the penetration control means is small, the softening temperature of the control member is close to the normally defined softening temperature.

  The thermoplastic material is preferably a thermoplastic resin. It is essential that the softening temperature of the control member be lower than the softening temperature of the components of the vacuum equipment. A thermoplastic resin has a remarkably low softening temperature compared to thermoplastic materials such as metal and glass, so that it is easy for the softening temperature to be lower than that of components of vacuum equipment. Therefore, the freedom degree of the structure of a vacuum equipment can be improved by making a control member into a thermoplastic resin.

  Moreover, although the installation location of the control member is not limited, the yield is high because it can be easily created and reliably controlled by placing it between the jacket material and the member that opens the through-hole.

  Moreover, a sharp metal is good for the member which opens a through-hole. The temperature at which the through-hole is generated in the jacket material (container) is desirably as low as possible in order to reduce the temperature applied to the vacuum equipment. For this reason, it is desirable to increase the force applied per unit area of the jacket material (container) so that a through-hole is formed even if the degree of softening of the jacket material (container) is small.

  Increasing the force applied to the unit area of the jacket material (container) is achieved by reducing the contact area between the member that applies the stab force to the jacket material (container) and the jacket material (container). In order to reduce the contact area between the outer cover material (container) and the member that applies the piercing force to the outer cover material (container), the member that applies the piercing force to the outer cover material (container) contacts the outer cover material (container). What is necessary is just to make the part to make into a sharp shape.

  At this time, if the softening temperature of the portion where the member that applies the stab force to the jacket material (container) is in contact with the jacket material (container) is lower than or equal to the softening temperature of the jacket material (container), the jacket material At the softening temperature of the (container), the sharpness is lost. Therefore, it is required that the softening temperature of the portion where the member that applies the stab force to the jacket material (container) contacts the jacket material (container) is significantly higher than the softening temperature of the jacket material (container). Since metal has a remarkably higher softening temperature than resin, the above conditions can be satisfied.

  As a metal, it is desirable to use what is normally used as a structure, such as iron, copper, and aluminum. In addition, an alloy that can be used as a structure, such as stainless steel and duralumin, may be used instead of a single metal.

  Further, the invention of the vacuum heat insulation box according to claim 3 is the invention according to claim 2, wherein the member that opens the through hole applies a piercing force to the container by an elastic force to generate a through hole. It is.

  In order for a member that applies a piercing force to the jacket material (container) to continue to apply a piercing force to the jacket material (container), a part of the member is made of an elastic body, and the piercing force is applied to release the piercing force. The phenomenon of applying a force to the jacket material (container) can be used. For example, the object is sandwiched between clips. Since the elastic body is a spring, the force applied to the jacket material (container) can be easily controlled.

  Further, as another example of the method of applying the piercing force with the elastic body, the piercing force is continuously applied to the outer jacket material (container) by pressing the spring member in a contracted state, so that the outer jacket material (container) As the temperature rises, the thermoplastic material of the penetration control means softens, and a through hole is formed in the jacket material (container).

  Moreover, the invention of the vacuum heat insulation box according to claim 4 is the invention according to any one of claims 1 to 3, wherein the gas adsorbent is a ZSM-5 type zeolite in which copper ions are exchanged. It is what is.

  Copper ion-exchanged ZSM-5 type zeolite is one of the few adsorbents that adsorb inert nitrogen, has a large amount of air adsorption per unit weight, and has a very good air adsorption capacity. It is very highly active for both. For this reason, it is necessary to make the gas which has adsorbed moisture by the moisture adsorbing material reach the gas adsorbing material. By optimizing the air permeability of the partition that connects the space where the gas adsorbent and the moisture adsorbent are accommodated, the amount of water-containing gas is reduced by increasing the time that the gas stays near the moisture adsorbent. To reach.

  The invention of the vacuum heat insulation box according to claim 5 of the present invention is the invention according to any one of claims 1 to 4, wherein the core material is dry silica having an average primary particle diameter of 100 nm or less. There is something.

  Dry silica having an average primary particle size of 100 nm or less has a small air gap distance and a small mean free path, and is therefore excellent as a core material of a vacuum heat insulating material (vacuum heat insulating box). Although it is an excellent core material, there is a problem that exhaust resistance is large.

  Therefore, after roughly evacuating the space, the exhaust port is sealed, and an air adsorption device is developed, so that it can be decompressed while being left by a chemical vacuum pump that decompresses with an air adsorbent. The process can be shortened.

  Further, the chemical vacuum pump effect can be applied even to a core material whose exhaust resistance is smaller than that of dry silica. It is preferable to consider the application in consideration of the pressure reduction time by the mechanical vacuum pump, the adsorbent cost, and the heat insulation performance.

  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 schematic cross-sectional view showing a state before the gas adsorption device used in the vacuum heat insulation box according to Embodiment 1 of the present invention is opened, and FIG. 2 shows the vacuum heat insulation box according to Embodiment 1 of the present invention. FIG. 3 is a schematic cross-sectional view showing the state after opening of the used gas adsorption device, and FIG. 3 is a schematic cross-sectional view of the vacuum heat insulation box according to Embodiment 1 of the present invention.

  As shown in FIGS. 1 and 2, the gas adsorbing device 1 of the present embodiment is a soft adsorbent comprising a gas adsorbing material 2, a moisture adsorbing material 3, and a plastic laminate film (a gas hardly permeable material) including an aluminum foil. The container 4 is composed of a packaging material, and the container 4 is partitioned into two storage spaces by a partition 5 made of a non-woven fabric whose air permeability can be adjusted. The gas adsorbent 2 and the moisture adsorbent 3 are respectively The containers 4 are accommodated in different accommodation spaces. The two storage spaces partitioned by the partition 5 are arranged in a direction substantially perpendicular to the thickness direction of the storage space for storing the gas adsorbent 2 or the moisture adsorbent 3.

  Further, a piercing force is applied to the container 4 forming the accommodation space in which the moisture adsorbing material 3 is accommodated by a member 10 that applies a clip-like piercing force. Furthermore, a member 11 that opens a sharply shaped through hole is provided between the member 10 that applies the piercing force and the container 4 that forms the storage space in which the moisture adsorbing material 3 is stored. A control member 12 made of a thermoplastic material is provided between the member 11 that opens the through hole and the container 4 that forms a space in which the moisture adsorbing material 3 is accommodated.

  As shown in FIG. 3, the vacuum heat insulating box 13 includes an outer box 14, an inner box 15, and a core 16 made of stainless steel (a gas-impermeable material), and is formed between the outer box 14 and the inner box 15. The core material 16 is installed in the space 17, the space 17 is sealed by joining the outer box 14 and the inner box 15, and the space 17 is installed in the outer box 14 from the exhaust port 18 that communicates the space 17 and the outside air. The vacuum heat insulation box 1 is configured by exhausting air and sealing the exhaust port 18 after decompression. The inner box 15 has an opening 19 for taking in and out hot water and cold water. The gas adsorption device 1 is installed in the space 17.

  The operation and action of the vacuum heat insulating box configured as described above will be described below with reference to FIGS.

  First, as shown in FIG. 1, when the gas adsorbing device 1 is stored, the gas adsorbing material 2 is vacuum-sealed inside a container 4 made of a gas-impermeable material, so that the gas adsorbing device 1 is kept in the atmosphere for a long time. Even if it is left inside, the gas adsorbent 2 does not come into contact with the gas, so it does not deteriorate and can be stored in the atmosphere for a long time.

  Next, in FIG. 2, since the gas adsorbing device 1 is heated, the control member 12 is softened, and the member 10 that applies the piercing force always has the piercing force applied to the member 11 that opens the through hole. The control member 12 has a through hole, and further, a through hole is formed in the container 4 forming the storage space in which the moisture adsorbing material 3 is stored. Develops ability.

  Since the air permeability of the through hole generated by the member 11 that opens the through hole is made larger than the air permeability of the partition 5, the gas that has entered the housing space containing the moisture adsorbing material 3 is stagnated inside. Become. Since the moisture contained in the gas is removed by the moisture adsorbing material 3 during this period, the amount of the gas that reaches the gas adsorbing material 2 through the partition 5 is very reduced.

  Therefore, since the gas adsorbent 2 can exhibit most of its adsorption capacity for gas adsorption, it can adsorb gas efficiently.

  Here, since the water | moisture-content adsorption material 3 is a powder form, since the surface area per unit weight is large, the water | moisture content in gas can be removed in a shorter time. For this reason, even if the residence time in the accommodation space in which the moisture adsorbing material 3 is accommodated is short, the moisture can be removed. Therefore, the air permeability of the partition 5 can be increased, and a larger amount of gas can be adsorbed per unit time. By the above means, the usable gas adsorption device 1 can be obtained even when it is necessary to adsorb a large amount of gas in a short time.

  In the case of adsorbing air, the gas adsorbent 2 is preferable because the ZSM-5 type zeolite subjected to copper ion exchange has a large amount of air adsorption per unit weight and can adsorb inert and hardly adsorbed nitrogen.

  By the means as described above, it is possible to maintain the degree of vacuum over a long period of time in both cases of storage and application to a vacuum heat insulating box.

  In the present embodiment, the inside of the container 4 is partitioned into two housing spaces. However, the present invention is not limited to this, and may be partitioned into at least two housing spaces.

  Further, when the gas outside the gas adsorbing device 1 is adsorbed, the gas passes through the accommodation space containing the moisture adsorbing material 3, the contained moisture is adsorbed, and the accommodation space containing the gas adsorbing material 2 has less moisture. To reach.

  In addition, since the two storage spaces partitioned by the partition are arranged in a direction substantially perpendicular to the thickness direction of the storage space for storing the gas adsorbent 2 or the moisture adsorbent 3, the gas adsorbing device 1 The thickness is substantially equal to the thicker one of the accommodating space for accommodating the gas adsorbing material 2 and the accommodating space for accommodating the moisture adsorbing material 3.

  The thickness of the gas adsorbing device 1 is adjusted by adjusting the maximum thickness of the gas adsorbing material 2 and the moisture adsorbing material 3 accommodated in the accommodating space (or the gas adsorbing material 2 or the accommodating space accommodating the moisture adsorbing material 3). Can be adjusted. By applying the thinned gas adsorption device 1, it is possible to thin the vacuum heat insulating box (wall thickness).

  Moreover, since communication is performed after sealing the vacuum heat insulation box, if a gas difficult to be adsorbed by the gas adsorbent 2 is present in the gas adsorbing device 1, it remains in the vacuum equipment after vacuum sealing. Therefore, the inside of the gas adsorption device 1 needs to be evacuated in advance, and the pressure is desirably 100 Pa or less.

  In addition, when the air permeability of the partition 5 between the storage space for storing the gas adsorbing material 2 and the storage space for storing the water adsorbing material 3 is too large, the water adsorbing material 3 cannot absorb moisture, and the gas adsorbing material 2 Moisture reaches and the moisture adsorbing material 3 deteriorates. On the other hand, when the air permeability of the partition 5 between the storage space for storing the gas adsorbent 2 and the storage space for storing the moisture adsorbent 3 is too small, the gas does not reach the gas adsorbent 2 and the gas adsorbent 2 It becomes difficult to exhibit adsorption characteristics.

  Therefore, by using a continuous porous body as the partition 5, the bulk portion acts as a spacer and the void portion acts as a partition 5 through which gas passes, so that these conditions can be satisfied.

  Moreover, in this Embodiment, the nonwoven fabric is used for the continuous porous body which comprises the partition 5. FIG.

  When the gas adsorbing device 1 is applied to a vacuum apparatus covered with a soft packaging material such as the vacuum heat insulating material 7, atmospheric pressure is applied to the gas adsorbing device 1, and a force for narrowing the gap of the partition 5 connecting the spaces is applied. The nonwoven fabric is a typical continuous porous body and has excellent air permeability. Moreover, the compression rate when pressure is applied can be adjusted by selecting an appropriate material and manufacturing method. Therefore, the space | gap of the partition which connects the space of the gas adsorption device 1 can be hold | maintained appropriately also under atmospheric pressure.

  Moreover, since the nonwoven fabric does not go through the process of weaving like a cloth during the manufacturing method, it can be obtained at low cost. By using this, the gas adsorption device 1 can be obtained at low cost. Furthermore, since the nonwoven fabric has a high degree of freedom in shape with respect to the bending force, if the container of the gas adsorption device 1 is a soft packaging material, the degree of freedom in bending of the gas adsorption device 1 is also increased, and can be used for more general purposes. become.

  In the first embodiment, a plastic laminate film is used for the gas-impermeable material of the container 4.

  The plastic laminate film is a soft packaging material and has a high degree of freedom in shape with respect to bending force. Therefore, by using the plastic laminate film as a container, the degree of freedom in shape with respect to the bending force of the gas adsorption device is increased. Furthermore, by laminating aluminum foil, excellent barrier properties can be obtained, and the gas adsorbent 2 can be stored for a long period of time.

  Powdered CaO is most preferable for the moisture adsorbing material 3 because of cost, deliquescence and the like.

  In addition, the member that opens the through hole is preferably a sharp shape, and the strength depends on the correlation between the piercing force applied by the member 10 that applies the piercing force and the strength of the control member 12 and the container 4, but the material is not metal. A hard one is preferable. Resin may be used, but the control member 12 and the container 4 need to be strong enough to cause a through hole.

  The member 10 that applies the piercing force is not limited, but it is simple and preferable to use an elastic principle such as a clip or a spring. Moreover, the member which adds the piercing force by magnetic force can adjust the timing which applies a piercing force, and is preferable.

  The control member 12 is not particularly limited as long as it is a thermoplastic material, but is preferably a metal, glass, or resin, and more preferably a resin material has a low thermal softening temperature. Moreover, although the control member 12 may be inside the container 4, it is preferable to install between the member 11 and the container 4 which open a through-hole from handling property and reliability.

  In FIG. 3, the vacuum heat insulating box 13 is provided with a core material 16 between the outer box 14 and the inner box 15, sealed, then depressurized from the exhaust port 18, and sealed after being depressurized. Thereafter, the vacuum heat insulating box 13 is heated to develop the adsorption capability of the gas adsorption device 1 as shown in FIGS. 1 and 2, adsorb residual air in the space 17, and The air entering from the box 15 is adsorbed and the degree of vacuum is maintained.

  However, in the case of a shape such as the vacuum heat insulation box 13, the exhaust port 18 has a small cross-sectional area, so that the exhaust resistance is high and decompression takes time. The exhaust port may be enlarged, but in this case, unlike a laminate film, it cannot be easily sealed, and a metal such as stainless steel requires welding and brazing, which makes sealing difficult. Further, when the core material 16 is a fine material having an average primary particle diameter of 100 nm or less, such as dry silica, the heat insulation performance is excellent, and particularly the pressure dependency is high, but the exhaust resistance is high, and the decompression takes a very long time. Takes more man-hours. Therefore, in such a case, the pressure reduction by the mechanical vacuum pump from the exhaust port 18 is limited to roughing of about 1300 Pa which can be reduced in a relatively short time.

  And after sealing the exhaust port 18, the vacuum heat insulation box 13 is heated, and the adsorption capability of the gas adsorption device 1 is expressed as shown in FIGS. Then, it is preferable to reduce the number of man-hours by utilizing the remaining air that has not been exhausted by the mechanical vacuum pump as a chemical vacuum pump that is adsorbed by the gas adsorbent 2. When acting as a chemical vacuum pump, it is necessary to increase the amounts of the gas adsorbent 2 and the moisture adsorbent 3 in accordance with the amount of residual air.

  The outer box 14 and the inner box 15 need to maintain the shape of the box, and in this embodiment, stainless steel is used in 1, but a molded body of resin, other metal, or glass may be used. In the case of metal, since it is excellent in gas barrier property and durability, it is more preferable in terms of reliability. In the case of resin, since it is excellent in moldability, it is preferable when shape flexibility is required.

  In addition, when using a resin material, it is preferable to use an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyacrylonitrile, MX nylon, polyvinyl alcohol, or the like, which is a gas-impermeable resin, and a metal foil as the resin material. It is preferable to improve gas permeability by insert molding, metal plating, metal vapor deposition, and vapor deposition / coating of inorganic materials such as silica, diamond-like carbon, and alumina.

  Further, the shape is not limited, but a shape having an opening 19 as shown in FIG. 3 is preferable when used for heat insulation. Moreover, you may use as an irregular-shaped vacuum heat insulating material with an unevenness | corrugation.

Example 1
Example 1 is a specific example of the gas adsorption device and the vacuum heat insulation box of the first embodiment. The same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the gas adsorption device 1 of Example 1, a powdery copper ion exchanged ZSM-5 type zeolite was used as the gas adsorbent 2.

  As the moisture adsorbing material 3, 10 g of CaO having a granular average particle diameter of 10 μm was used. As the container 4 of the gas adsorption device 1, a laminate film laminated in the order of 15 μm thick nylon, 25 μm thick nylon, 6 μm thick aluminum foil, and a low density polyethylene film of 50 μm thick was used.

  The partition 5 is a nonwoven fabric having a thickness of 100 μm and a width of 10 mm.

  The gas adsorption device 1 was produced by the following procedure in an argon atmosphere.

  A non-woven fabric is sandwiched between low-density polyethylenes of rectangular plastic laminate film facing each other, and heat-welded from the polypropylene film side to form a three-side sealed bag having this portion as a common base.

  The gas adsorbent 2 was inserted on one side, and the water adsorbent 3 was inserted on the other, and after installing in the chamber, sealing under reduced pressure was performed at 10 Pa. The thickness of the gas adsorption device 1 produced in this way was 2 mm.

  Next, the member 10 that applies a piercing force to the container 4 forming the accommodation space in which the moisture adsorbing material 3 is accommodated is a stainless steel clip, and is a member 11 that opens a through-hole in a portion to be sandwiched and contacted. A stainless steel needle is attached, and a polyethylene terephthalate piece having a diameter of 5 mm and a thickness of 1 mm is attached as a control member 12 to the needle tip, and an accommodation space in which the control member 12 (polyethylene terephthalate piece) and the moisture adsorbing material 3 are accommodated. The forming container 4 is brought into contact.

  Using the gas adsorption device 1 configured as described above, a substantially cubic vacuum heat insulating box 13 having a side of 16 cm was produced. The core material 16 of the vacuum heat insulation box 13 was obtained by adding 5% carbon black to 95 wt% dry silica and mixing them.

Stainless steel is used for the outer box 14 and the inner box 15, the space 17 has a thickness of 15 mm, the gas adsorbing device 1 is installed in advance, the outer box 14 and the inner box 15 are joined, and then the core 16 is removed from the exhaust port 18. . Packed at a density of 130 g / cm ³ . The outer box 14 and the inner box 15 are joined to each other by TIG welding, and the outer box 14 and the inner box 15 are welded at the contact portion of the opening 19.

  After the core material 16 was sealed, the pressure was reduced from the exhaust port 18 previously attached to the outer box 14 for about 60 minutes, so that the pressure was reduced to 1000 Pa, the exhaust port 18 was pinched and sealed by brazing. And if the vacuum heat insulation box 13 is heated to 90 degreeC and left to stand for 2 hours, the control member 12 of the heated gas adsorption device 1 will soften, and the needle which is the member 11 which opens a through-hole will apply a piercing force Since it is pressed by the member 10, the softening of the control member 12 makes it impossible to withstand this force, resulting in a through hole. As a result, first, the moisture adsorbing material 3 in the gas adsorbing device 1 and the space 15 in the vacuum heat insulating box 11 communicate with each other, and the moisture adsorbing material 3 adsorbs moisture, and then the gas adsorbing material 2 is air through the partition 5. To adsorb.

  The internal pressure after the vacuum heat insulation box 13 is stored in the atmosphere for 1 month is 100 Pa, adsorbs the remaining air in the space 17, functions as a chemical vacuum pump, and enters through the outer box 14 and the inner box 15. It can be seen that the adsorbing gas is adsorbed.

  Moreover, in order to investigate the water | moisture-content adsorption amount of CaO, as a result of measuring the weight increase amount, it increased 0.45g, Therefore It turns out that 4.5% of water | moisture content is adsorb | sucking with respect to initial weight.

(Comparative Example 1)
In Example 1, when the water | moisture-content adsorption material 3 was not used, it was 700 Pa when the pressure inside the vacuum heat insulation box 13 was measured. Although the pressure is higher than that of Example 1, since the moisture adsorbent 3 is not used in the gas adsorbing device, the gas adsorbing material 2 adsorbs moisture, thereby reducing the gas adsorption capacity. It is.

  The gas adsorbing device according to the present invention is suitable for a vacuum heat insulating box because the gas adsorbing characteristics of a highly active gas adsorbing material can be sufficiently exerted, and the pressure reducing process can be shortened to reduce the pressure and thickness. The present invention can also be applied to vacuum equipment that exhibits its function by applying a vacuum.

Schematic sectional drawing which shows the state before opening of the gas adsorption device used for the vacuum heat insulation box in Embodiment 1 of this invention Schematic sectional drawing which shows the state after opening of the gas adsorption device used for the vacuum heat insulation box in Embodiment 1 of this invention Schematic sectional view of the vacuum heat insulation box in Embodiment 1 of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas adsorption device 2 Gas adsorption material 3 Moisture adsorption material 4 Container 5 Partition 10 Member which applies piercing force 11 Member which opens a through-hole 12 Control member 13 Vacuum heat insulation box 14 Outer box 15 Inner box 16 Core material 17 Space 18 Exhaust port

Claims (5)

  Each of the outer box and inner box made of a gas-impermeable material, a core material, and a gas adsorbing device, and the core material and the gas adsorbing device in a space formed between the outer box and the inner box And a vacuum heat insulation box having a vacuum double wall structure in which the air in the space is exhausted from an exhaust port provided in the outer box and the space is sealed under reduced pressure, and the gas adsorption The device is composed of a gas adsorbing material, a moisture adsorbing material, and a container made of a gas-impermeable material, and the container is partitioned into at least two accommodation spaces by a partition capable of adjusting air permeability. The gas adsorbing material and the moisture adsorbing material are respectively housed in different housing spaces of the container.   A through-hole is prevented from forming in the container forming the accommodation space in which the moisture adsorbing material is accommodated until it is made of a thermoplastic material and is softened, and the gas adsorbing material adsorbs gas outside the container. The control member that prevents the control member from being softened, and the control member that has been softened at a predetermined temperature rise while continuing to apply a piercing force to the control member with a force that does not penetrate the control member. And a member for forming a through hole in the container forming the accommodation space in which the control member and the moisture adsorbent are accommodated by deforming the control member with the piercing force. A vacuum insulation box according to 1.   The vacuum heat insulating box according to claim 2, wherein the member that opens the through hole applies a piercing force to the container by an elastic force to generate a through hole.   The vacuum heat insulating box according to any one of claims 1 to 3, wherein the gas adsorbent is ZSM-5 type zeolite subjected to copper ion exchange.   The vacuum insulation box according to any one of claims 1 to 4, wherein the core material is dry silica having an average primary particle diameter of 100 nm or less.