JP6728438B1 - Vacuum insulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: In a conventional example of a vacuum heat insulating material whose internal physical properties can be measured by using a sensor or the like, there is a limit in continuous supply of electric power to a sensor system mounted therein by a battery. In order to receive the data from the car for a long time, it had to be recharged each time.
According to the present invention, a small wireless vacuum gauge including a pressure sensor, a power receiving coil, a DC/DC converter, and a transmission unit for transmitting measurement data including at least a pressure value is provided inside an air insulating material. , The voltage of electricity by non-contact power supply is stabilized by a DC/DC converter, and the coil diameter of the power receiving coil used for power supply to the sensor and communication with the sensor is determined by the distance between the power transmitting coil and the gas barrier film. Provided is a vacuum heat insulating material which realizes stable power supply and can continuously perform communication without interruption by appropriately setting the range in which communication and power transmission are possible according to the thickness.
[Selection diagram] Figure 1

Description

The present invention relates to a vacuum heat insulating material used for an outer wall of a house or a plant in order to efficiently use heat energy. Specifically, in a vacuum heat insulating material including a small sensor capable of measuring internal physical properties of the vacuum heat insulating material, a wireless transmission device, and a DC/DC converter, the DC/DC converter steps up or down the voltage. The present invention relates to a vacuum heat insulating material that realizes stable non-contact power supply and thereby supplies power to an internal sensor and enables communication with the sensor.

The vacuum heat insulating material is widely used in various fields such as a refrigerator, a thermos, an outer wall of a house or a plant as a heat insulating material having a higher heat insulating performance than styrofoam. In this vacuum heat insulating material, for example, a bag-shaped gas barrier film enclosing the core material is covered with a core material made of a porous body having many voids inside to reduce the pressure, and the opening of the gas barrier film is heat-welded ( It can be heat-sealed) and an outer layer is provided outside the gas barrier film.

Generally, it is said that the vacuum heat insulating material deteriorates over time as it is operated for a long period of time, and gas such as air gradually flows into the interior from the outside over a long period of time, and the heat insulation performance due to the inflow of gas decreases. It has a problem, and has problems in terms of long-term operation and performance prediction. Further, there is a scarce method of confirming the heat insulation performance after the construction of the vacuum heat insulation material, and the only method is to read the change in the heat insulation performance accurately by removing the vacuum heat insulation material and measuring the thermal conductivity and the like.

Therefore, in order to monitor the performance of the vacuum heat insulating material over a long period of time, in addition to the degree of vacuum that is directly related to the heat insulating performance of the vacuum heat insulating material, various information such as temperature, humidity, gas molecules, etc. are measured and the vacuum heat insulating material is measured. A vacuum heat insulating material having a mechanism capable of transmitting information inside the material to the outside has been proposed as a conventional technique.

For example, in the vacuum heat insulation panel described in Japanese Patent No. 4641565 (Patent Document 1), a core material is covered with a gas barrier outer skin material, and a temperature sensor unit capable of measuring the temperature of the surroundings, and a measurement result by the temperature sensor unit are displayed. The communication unit capable of wireless communication and the battery are arranged inside the outer cover. Further, the vacuum heat insulation panel described in JP 2012-136254 A (Patent Document 2) is a heat insulation panel in which a heat insulation material is covered with a gas barrier film and the inside is evacuated, and at least a vacuum sensor is provided inside the outer skin material. A battery and a communication unit capable of transmitting the vacuum data detected by the vacuum sensor to the outside are provided. In addition, a similar vacuum heat insulation panel is also described in JP-A-2015-513327 (Patent Document 3).

In this way, the conventional vacuum insulation panel with a built-in sensor can measure the degree of vacuum of the vacuum insulation panel and the surrounding temperature, send the measured value to the outside, and monitor the insulation performance of the vacuum insulation panel. be able to.

Japanese Patent No. 4641565 JP 2012-136254A JP, 2005-513327, A

Since the vacuum heat insulating material as in the above conventional example has a thickness of about 10 to 20 mm, a thin and small battery is required for a sensor system having a certain volume or less to be mounted therein. However, since there is a limit to the continuous power supply to the sensor system from a thin and small battery, it is possible to receive data from the sensor only in a short period of time, and to receive data from the sensor for a long period of time. Had to recharge each time. Further, since the electric power supplied by the battery gradually decreases, the output signal from the sensor becomes weak, and the output value of the sensor decreases, which may make it impossible to measure an accurate value.

Therefore, in the present invention, in order to solve the above problems, a pressure sensor, a power receiving coil, a DC/DC converter, and a transmission unit that transmits measurement data including at least a pressure value are included inside a vacuum heat insulating material. A small wireless vacuum gauge is provided, and non-contact power supply that supplies power without physical electrical connection is stabilized by step-down or step-up by a DC/DC converter, and is used for power supply to and communication with the sensor. Stable power supply to a small wireless vacuum gauge is achieved by setting the coil diameter of the coil appropriately within a range in which communication and power transmission are possible depending on the distance from the power transmission coil (power transmission distance) and the thickness of the gas barrier film. (EN) Provided is a vacuum heat insulating material configured so that communication with a small wireless vacuum gauge can be continuously performed without interruption.

As one embodiment of the vacuum heat insulating material according to the present invention, the vacuum heat insulating material includes a core material, an aluminum vapor deposition layer that is a gas barrier film covering the core material, and an outer layer provided outside the aluminum vapor deposition layer. In the vacuum heat insulating material containing the
The vacuum heat insulating material includes a small wireless vacuum gauge inside the outer layer,
The compact wireless vacuum gauge includes at least a pressure sensor, a non-contact power supply unit for supplying electric power to the pressure sensor, and a transmission unit for transmitting measurement data including at least a pressure value measured by the pressure sensor. Including,
The non-contact power feeding unit includes a power receiving coil that is contactlessly fed from a power transmitting coil included in a power transmitting side device, and a DC/DC converter connected to the power receiving coil.
The DC/DC converter maintains a constant voltage by increasing or decreasing the electricity generated in the power receiving coil.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the total thickness of the aluminum vapor deposition layer of the film capable of transmitting power when the power transmission distance between the power receiving coil and the power transmitting coil is 112 mm or less is y, and the coil It is characterized in that the coefficient a of inclination obtained from a linear function expressed by a relational expression y=ax+b (where a and b are integers) having a diameter x is 30 or more.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the total thickness of the aluminum vapor deposition layer is 500 Å or more and 6000 Å or less, and the coil diameter of the power receiving coil is 74 mm or more and 200 mm or less.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the total thickness of the aluminum vapor deposition layer is 500 Å or more and 2000 Å or less, and the coil diameter of the power receiving coil is 74 mm or more and 200 mm or less.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the total thickness of the aluminum vapor deposition layer of the film capable of transmitting power when the power transmission distance between the power receiving coil and the power transmitting coil is 62 mm or more and 132 mm or less is y. , A coefficient of inclination a obtained from a linear function represented by a relational expression y=ax+b (where a and b are integers) with the coil diameter as x is 30 or more and 45 or less.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, when the coil diameter x of the power receiving coil is 74 mm≦x≦200 mm, the total thickness y of the aluminum vapor deposition layer is 30x-4000≦y≦45x-2837. Is characterized in that

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the total thickness of the aluminum vapor deposition layer is 500 Å or more and 2000 Å or less, and the coil diameter of the power receiving coil is 100 mm or more and 150 mm or less.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the non-contact power feeding unit uses an electromagnetic induction method that is a method of transmitting electric power by using induction magnetic flux generated between the power receiving coil and the power transmitting coil. It is characterized by being used.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the power receiving coil and the power transmitting coil are respectively included in a resonance circuit,
The non-contact power feeding unit is a method of magnetic field resonance in which vibration of a magnetic field generated by a current flowing through the power transmission coil is transmitted to the power receiving coil that resonates at the same frequency to cause magnetic field resonance to transmit power. Is used.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the transmission unit transmits the measurement data in a frequency band equal to or less than a frequency band used in non-contact power feeding. ..

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the small wireless vacuum gauge further includes at least one of a temperature sensor, a humidity sensor, a sensor for measuring various molecular species, and an internal clock.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the temperature sensor and the humidity sensor are isolated from the power receiving coil.

As a preferred embodiment of the vacuum heat insulating material according to the present invention, the temperature sensor and the humidity sensor are separated from the power receiving coil by 30 mm or more.

The vacuum heat insulating material according to one embodiment of the present invention is a non-contact power supply for supplying power to a pressure sensor without electrical connection to an external power source to a small wireless vacuum gauge provided inside the outer layer. A unit is provided, and the DC/DC converter connected to the power receiving coil in the non-contact power feeding unit can maintain a constant voltage by reducing or boosting the electricity generated in the power receiving coil. With such a non-contact power supply unit, it is not necessary to provide a small wireless vacuum gauge with a battery that cannot maintain a constant voltage due to a reduction in the remaining amount, and an output signal can be stably obtained from the pressure sensor.

In addition, the coil diameter of the power receiving coil used for power supply to the pressure sensor and communication with the pressure sensor should be set appropriately according to the distance from the power transmission coil (power transmission distance) and the thickness of the aluminum vapor deposition layer that is the gas barrier film. By setting the range in which communication and power transmission are possible, stable power supply to the small wireless vacuum gauge can be realized, and communication with the small wireless vacuum gauge can be continuously performed without interruption.

It is a block diagram which shows the component structure of the small wireless vacuum gauge contained in the vacuum heat insulating material which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the power transmission device which supplies electric power to the small wireless vacuum gauge shown in FIG. It is a block diagram which shows a mode of non-contact electric power feeding and wireless communication via a vacuum heat insulating material between a small wireless vacuum gauge and a power transmission device included in the vacuum heat insulating material according to an embodiment of the present invention. It is a figure which shows the structural example of the vacuum heat insulating material used for the performance experiment of non-contact electric power feeding and wireless communication. It is a graph which shows the relationship between the coil diameter and vapor deposition thickness which can be electric-powered based on the experimental result obtained by changing the power transmission distance of the non-contact electric power feeding of a small wireless vacuum gauge. It is a block diagram which shows the components structure of the small wireless vacuum gauge contained in the vacuum heat insulating material which concerns on another embodiment of this invention.

An embodiment of the present invention will be described below with reference to the drawings. In all of the drawings for explaining the embodiments, the same members are denoted by the same reference symbols in principle and their repeated description is omitted.

FIG. 1 is a block diagram showing a component configuration of a small wireless vacuum gauge included in a vacuum heat insulating material according to an embodiment of the present invention. The small wireless vacuum gauge 10 may include a power receiving coil 11, a DC/DC converter 12, a CPU/wireless transmission unit 13, an A/D converter 14, an operational amplifier (OP AMP) 15, and a pressure sensor 16. It is possible to mount these components on a board, for example.

The power receiving coil 11 is a coil that acts on a power transmitting coil included in the power transmitting device (see FIG. 2) by a contactless power feeding method such as a magnetic field resonance method or an electromagnetic induction method to obtain electricity. The electromagnetic induction method is a method of transmitting electric power by using an induction magnetic flux generated between a power reception coil and a power transmission coil. The magnetic field resonance method is a method in which vibration of a magnetic field generated by a current flowing through a power transmission coil is transmitted to a power reception coil that resonates at the same frequency to cause magnetic field resonance to transmit power.

The DC/DC converter 12 is electrically connected to the power receiving coil 11 and the CPU/wireless transmission unit 13, and is provided between the power receiving coil 11 and the CPU/wireless transmission unit 13. The DC/DC converter 12 is a step-up/down converter for increasing or decreasing the voltage. During non-contact power feeding, step down when the distance between the power receiving coil 11 and the power transmitting coil 21 (see FIG. 2) is short and a large voltage is obtained, and step up if a long distance and only a small voltage is obtained. Used as a purpose. In one embodiment of the present invention, the DC/DC converter 12 can step up or step down the voltage in order to stabilize the electricity generated in the power receiving coil 11. Hereinafter, the configuration including the power receiving coil 11 and the DC/DC converter 12 is also referred to as a non-contact power feeding unit.

The CPU/wireless transmission unit 13 is electrically connected to the DC/DC converter 12 and the A/D converter 14, and is provided between the DC/DC converter 12 and the A/D converter 14. The CPU/wireless transmission unit 13 receives a digital signal obtained by converting the output signal (analog signal) from the pressure sensor 16 by the A/D converter 14, and uses the received digital signal as measurement data, the power reception coil 11 and the power transmission coil 21. It is possible to communicate with each other at a frequency band equal to or lower than the frequency at the time of power feeding, and transmit the data serially converted by the UART to the PC 23.

The A/D converter 14 is electrically connected to the CPU/wireless transmission unit 13 and the operational amplifier 15, and is provided between the CPU/wireless transmission unit 13 and the operational amplifier 15. The A/D converter 14 can convert the analog signal amplified by the operational amplifier 15 into a digital signal.

The operational amplifier 15 is electrically connected to the A/D converter 14 and the pressure sensor 16, and is provided between the A/D converter 14 and the pressure sensor 16. The operational amplifier 15 can amplify the analog signal of the pressure value measured by the pressure sensor 16.

The pressure sensor 16 is electrically connected to the operational amplifier 15 and measures the pressure inside the vacuum heat insulating material. As the pressure sensor 16, a thermocouple type vacuum sensor formed by a micro electro mechanical system (MEMS) can be used. Further, as the pressure sensor 16, a Pirani vacuum gauge or a diaphragm vacuum gauge formed by MEMS can be used.

The power receiving coil 11 connected to the CPU/wireless transmission unit 13 via the DC/DC converter 12 is connected to the CPU/wireless transmission unit 13 and other parts (elements) electrically connected to the CPU/wireless transmission unit 13 during non-contact power feeding. Power can be supplied. Further, the power receiving coil 11 can supply electric power for operating the CPU/radio transmission unit 13, the pressure sensor 16, and the like. The DC/DC converter 12 can convert the voltage obtained from the power receiving coil 11 into a voltage required for stable operation of the CPU/wireless transmission unit 13, the pressure sensor 16, and the like.

As shown in FIG. 1, when the non-contact power feeding unit uses a coil for non-contact power feeding (power receiving coil 11 in FIG. 1) as a power feeding mechanism, the power generated by the electromagnetic induction method or the magnetic field resonance method is converted into DC. It can be supplied to the CPU/wireless transmission unit 13, the pressure sensor 16 and the like via the /DC converter 12. For example, in the case of the electromagnetic induction method, the power receiving coil 11 of the non-contact power feeding unit non-contacts the power generated by using the dielectric flux generated between the power receiving coil of the vacuum heat insulating material and the power feeding coil connected to the external power source. It can be received by the power supply unit.

In the case of the electric field resonance method, the non-contact power feeding unit includes a power receiving side resonance circuit, and the power receiving coil 11 included in the power receiving side resonance circuit is generated by a current flowing through the power transmission side coil included in the power transmission side resonance circuit. The vibration of the generated magnetic field is transmitted to the power receiving coil 11 included in the power receiving side resonance circuit that resonates at the same frequency, so that the electric power generated by the magnetic field resonance can be received by the CPU/wireless transmission unit 13, the pressure sensor 16, and the like. ..

The small wireless vacuum gauge 10 is provided inside the vacuum heat insulating material, which is hermetically sealed under reduced pressure. The vacuum heat insulating material includes a core material, a gas barrier film covering the core material, and an outer layer provided on the outer side of the gas barrier film, and the small wireless vacuum gauge 10 is inside the outer layer of the vacuum heat insulating material. Preferably, it is contained inside the gas barrier film.

As described above, the small wireless vacuum gauge 10 includes a contactless power supply unit including a contactless power supply mechanism (for example, the power receiving coil 11 and the DC/DC converter 12) that can stably supply power without electrical connection with an external power source. By providing, even if the small wireless vacuum gauge 10 is built in the vacuum heat insulating material, when the measurement data is acquired from the pressure sensor 16 of the small wireless vacuum gauge 10, electric power is supplied at a constant voltage and the pressure sensor 16 and the CPU. -It can be continuously supplied to the wireless transmission unit 13 and the like.

The small wireless vacuum gauge 10 can be equipped with a temperature sensor and a humidity sensor formed of MEMS as required. Since the humidity inside the vacuum heat insulating material approaches 0% as long as it is in a vacuum state, it is preferable that the measurement accuracy at less than 10% RH is within 2.0% as compared with the relative humidity of 10% or more. Further, since the position where the temperature sensor or the humidity sensor is mounted is at least 30 mm away from the power receiving coil 11, it is possible to solve the heat problem due to the induction heating caused on the film surface during power feeding. If the position is within 30 mm, heat from induction heating may adversely affect the measured temperature and humidity.

As the core material of the vacuum heat insulating material, those used in the vacuum heat insulating material field can be used without particular limitation. As specific examples, open-cell rigid polyurethane foam, inorganic fiber, organic fiber, inorganic powder, aerogel and the like can be used. From the viewpoint of handling and heat insulating properties, inorganic fibers formed in a sheet shape are preferable. Examples of the inorganic fibers include glass fibers, ceramic fibers such as alumina and silica, slag wool fibers, rock wool fibers and the like. Among these, glass fibers are preferable from the viewpoint of heat insulation properties, moldability, and the like. In addition, in order to improve the heat resistance of the core material, a small amount of heat resistant metal fibers such as stainless steel, chromium-nickel alloy, high nickel alloy and high cobalt alloy can be mixed. Core materials are known and are readily available on the market or can be prepared.

In the vacuum heat insulating material according to one embodiment of the present invention, the adsorbent may be enclosed in a bag-shaped gas barrier film together with the core material. The adsorbent is, for example, a substance that adsorbs gas such as nitrogen, oxygen, carbon dioxide, and/or water. Examples of the adsorbent include calcium oxide, silica gel, zeolite, activated carbon, barium oxide, barium-lithium alloy, or a mixture thereof. From the viewpoint of gas adsorption performance and productivity, calcium oxide is preferable. Adsorbents are known and are readily available on the market or can be prepared.

The gas barrier film used in the present invention is not particularly limited as long as it has a gas barrier property, but it is preferable that a seal layer and a gas barrier layer are laminated, and the seal layer, the gas barrier layer and 1 It is more preferable that a plurality of resin film layers are laminated. The thickness of the gas barrier film is not particularly limited, but is usually 50 to 200 μm, preferably 60 to 180 μm.

The gas barrier layer is a layer that does not allow gas to permeate, and is used from the viewpoint of preventing the vacuum degree of the vacuum heat insulating material from being lowered. Examples of the gas barrier layer include a metal foil and a vapor deposition film in which a vapor deposition film is formed on a resin film. The vapor deposition film is obtained by forming a vapor deposition film on a base material by a vapor deposition method, a sputtering method or the like. From the viewpoint of gas barrier properties and economics, aluminum is preferably used in both the metal foil and the vapor deposition material.

When metal foil is used as the gas barrier layer, the power receiving coil provided on the film side with the metal barrier layer of the metal foil may cause strong induction heating during non-contact power feeding with the power transmitting coil, and the heat may melt the film. There is. Therefore, a gas barrier film using a metal foil cannot be used on the power receiving coil side. Therefore, from the viewpoint of the amount of gas permeation, by using a film that uses only a vapor deposition layer as a gas barrier layer on one side and a film that uses a metal foil on the other side, and install a power receiving coil on the vapor deposition layer side, In the case of non-contact power feeding with the above, induction heating does not occur from the power receiving coil on the vapor deposition layer side, so that the configuration is preferable from both viewpoints of gas permeation amount and power feeding.

Examples of the resin film as the base material of the vapor deposition film include aromatic polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); polyolefin resins such as polyethylene, polypropylene and olefin copolymers; polyvinyl chloride; Vinyl chloride resin such as vinyl chloride copolymer; polyamide resin such as nylon 6, nylon 66, and metaxylylenediamine/adipic acid condensate; acrylonitrile/butadiene/styrene copolymer, styrene such as acrylonitrile/styrene copolymer Resins; acrylic resins such as polymethylmethacrylate, acrylic acid ester and methylmethacrylate copolymer, thermoplastic resins such as ethylene-vinyl alcohol copolymer, polyvinyl alcohol and partially saponified polyvinyl acetate, A film manufactured from a thermosetting resin such as a phenol resin or a urea resin is used.

The thickness of the gas barrier layer is not particularly limited, but in the case of a metal foil, it is 1 to 60 μm, preferably 5 to 30 μm. When the thickness is 1 μm or more, the strength of the metal foil is high and formation of pinholes and the like can be suppressed. In the case of a vapor deposition film, the thickness of the gas barrier layer is 10 to 60 μm, preferably 12 to 30 μm, of which the thickness of the vapor deposition film is 0.02 to 0.6 μm, preferably 0.02 to 0.4 μm. Is. If the thickness of the deposited film is 0.02 μm or more, the gas barrier property can be exhibited, and if it is 0.4 μm or less, the technical difficulty of the film formation is not great, and the induction heating and communication that occur during non-contact power feeding and communication There are few obstacles. Metal foils and vapor-deposited films used for gas barrier layers are known, and are easily available on the market or can be prepared.

The seal layer is a resin that can be fused by heating. There is no particular limitation as long as it is a resin that can be heat-sealed. Specifically, a film made of a polyolefin resin such as polyethylene or polypropylene, polyacrylonitrile, PET, an ethylene-vinyl alcohol copolymer, or a mixture thereof can be used. Preferably, polyethylene, polypropylene, ethylene-vinyl alcohol copolymer is used. The polyethylene preferably has a density of 0.90 to 0.98 g/cm@3. The polypropylene preferably has a density of 0.85 to 0.95 g/cm3. The thickness of the seal layer is not particularly limited, but is usually 10 to 100 μm, preferably 25 to 60 μm. The resin used for the seal layer is known, and is easily available on the market or can be prepared.

The resin film layer is a layer optionally provided on the gas barrier layer for the purpose of protecting the gas barrier layer. As the resin film layer, aromatic polyester resins such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); polyolefin resins such as polyethylene, polypropylene and olefin copolymers; polyvinyl chloride, vinyl chloride copolymers, etc. Vinyl chloride resin; polyamide resin such as nylon 6, nylon 66, and metaxylylenediamine/adipic acid condensate; polyvinyl alcohol, acrylonitrile/butadiene/styrene copolymer, styrene resin such as acrylonitrile/styrene copolymer; A film made of a thermoplastic resin such as an acrylic resin such as polymethylmethacrylate or an acrylic ester/methylmethacrylate copolymer, or a thermosetting resin such as a phenol resin or a urea resin is used. Preferred is PET, nylon 6 or nylon 66. An organic or inorganic filler may be added to these resin films. These resins can be used alone or in admixture of two or more. In order to further improve the gas barrier performance of the gas barrier film, the resin film layer may be coated or laminated with a gas barrier resin obtained by polymerizing and copolymerizing vinyl monomers such as vinylidene chloride, acrylonitrile and vinyl alcohol. The particles may be mixed and dispersed in the resin film layer. The thickness of the resin film layer is not particularly limited, but is usually 5 to 40 μm, preferably 10 to 30 μm. The resin used for the resin film layer is known, and is easily available on the market or can be prepared.

The gas barrier film is formed in a bag shape. The bag shape is a shape in which the core material and the adsorbent can be put. The step of forming the gas barrier film in a bag shape is not particularly limited. For example, when the gas barrier film has a seal layer, two gas barrier films are overlapped so that the seal layers are in contact with each other, and the core material and the adsorbent are inserted around the portion containing the core material and the adsorbent. The gas barrier film may be formed in a bag shape by heat-sealing leaving an opening for the gas barrier film.

The outer layer used in the present invention is paper and/or non-woven fabric. Paper is a product produced by sticking vegetable fibers and other fibers together. Both organic and inorganic fibers can be used as paper materials. Examples of the organic fibers used as the material of the paper include plant-derived fibers and synthetic fibers, and examples of the inorganic fibers used as the material of the paper include fibers made of minerals and metals, synthetic fibers and the like. The non-woven fabric is a fiber sheet, a web or a batt, in which lines are oriented in one direction or randomly, and fibers are bonded by alternating current and/or fusion and/or adhesion. Both organic and inorganic fibers can be used as the material for the non-woven fabric.

The organic fibers as the material of the non-woven fabric include natural fibers and chemical fibers, and the natural fibers include cotton, wool, felt, hemp, pulp, silk, etc., and the chemical fibers include rayon, polyamide, polyester, polypropylene, acrylic fiber, Examples include vinylon, aramid fiber, and acetate. Examples of the inorganic fiber that is a raw material of the nonwoven fabric include glass fiber, carbon fiber, and mineral fiber. Preferred materials are polyamide, polyester, polypropylene. Paper and non-woven fabrics are known and are readily available on the market or can be prepared.

The outer layer has a thickness of 0.01 mm to 3 mm, preferably 0.03 to 0.5 mm. The basis weight of the outer layer is not particularly limited, but is preferably 10 to 200 g/m ² , and more preferably 20 to 100 g/m ² .

The outer layer is adhered to the side of the gas barrier film that is not in contact with the core material (outside of the vacuum heat insulating material), for example, by laminating. Examples of the laminating method include dry laminating, extrusion laminating, hot melt laminating, wet laminating and thermal laminating.

The vacuum heat insulating material according to one embodiment of the present invention has a plate shape. The plate shape means a thin and flat shape, and has two opposing surfaces and a side peripheral surface connecting these two surfaces. The outer layer covers a part of at least one surface of the plate-shaped vacuum heat insulating material, and preferably covers the edge of the surface arranged on the heat source side in use in a frame shape. The outer layer also preferably covers the side surface of the vacuum heat insulating material, and more preferably covers the entire surface (that is, both surfaces and the side peripheral surface) of the vacuum heat insulating material. Further, when a plurality of vacuum heat insulating materials are used in combination, it is advantageous to cover the side peripheral surface with an outer layer in order to prevent heat leakage at the joint portion between the vacuum heat insulating materials.

FIG. 2 is a block diagram showing a configuration of a power transmission device that supplies electric power to the small wireless vacuum gauge shown in FIG. The power transmission device 20 can include a power transmission coil 21, a DC/DC converter 22, and a PC/stabilized power supply 23. For example, these components can be mounted on a substrate.

The power transmission coil 21 is a coil that acts on the power receiving coil 11 included in the small wireless vacuum gauge (see FIG. 1) by a contactless power feeding method such as a magnetic field resonance method or an electromagnetic induction method to generate electricity in the power receiving coil 11. is there.

The DC/DC converter 22 is electrically connected to the power transmission coil 21 and the PC/stabilized power supply 23, and is provided between the power transmission coil 21 and the PC/stabilized power supply 23. In one embodiment of the present invention, the DC/DC converter 22 is a step-up/down converter for stepping up or stepping down the voltage, but in the power transmission device 20, it is mainly used for stepping up.

The main purpose of using the DC/DC converter 12 included in the small wireless vacuum gauge 10 and the DC/DC converter 22 included in the power transmission device 20 is that the voltage is stabilized by using such a buck-boost converter. This is because by driving the sensor, electric power is supplied while the output signal of the sensor is stabilized and induction heating of the surface of the gas barrier film (hereinafter also referred to as “VIP film”) is as small as possible.

The PC/stabilized power supply 23 is electrically connected to the DC/DC converter 22. The power supply in the power transmission device 20 can be supplied from the stabilized power supply, but a personal computer (PC) may be used to boost the voltage of electricity supplied from the PC side by the DC/DC converter 22.

FIG. 3 is a block diagram showing a state of non-contact power feeding and wireless communication between the small wireless vacuum gauge and the power transmitting device included in the vacuum heat insulating material according to the embodiment of the present invention via the vacuum heat insulating material. The small wireless vacuum gauge 10 is provided inside the heat insulating material, and the power transmission device 20 is provided outside the heat insulating material. At the time of non-contact power feeding, as shown in FIG. 3, the power receiving coil 11 of the small wireless vacuum gauge 10 includes a gypsum board 31, a foam (XPS) 32, which is a heat insulating material, and an aluminum vapor deposition which is a gas barrier film. It faces the power transmission coil 21 of the power transmission device 20 with the layer 33 interposed therebetween.

Hereinafter, the vacuum heat insulating material of the present invention will be described in detail with reference to Examples. However, the invention is not limited to the examples.

Power feeding test to small wireless vacuum gauge FIG. 4 is a diagram showing a configuration example of a vacuum heat insulating material used in performance experiments of non-contact power feeding and wireless communication. An experiment is performed in which non-contact power feeding by the power receiving coil 11 and the power transmitting coil 21 is performed through a gypsum board 31, a foam (XPS) 32, and a disintegrating material including an aluminum vapor deposition layer 33 that is a gas barrier film therebetween. .. In this experiment, as shown in FIG. 3, basically, the power receiving coil 11 side is assumed to be inside the heat insulating material, and the power transmitting coil 21 side is assumed to be the outside of the insulation material. The sensor observes whether power supply and communication can be confirmed at a remote site.

The sizes of the gypsum board 31, the foam (XPS) 32, and the aluminum vapor deposition layer 33 used in this experiment were each 450 mm square. The thickness of the gypsum board 31 is set to 12 mm, the thickness of the foam (XPS) 32 is changed to 50 mm, 70 mm, 100 mm and 120 mm, and the thickness of the aluminum vapor deposition layer 33 is 0 Å, 500 Å, 2000 Å, 4000 Å, 6000 Å. , 65000Å, the power transmission distance between the power receiving coil 11 and the power transmitting coil 21 was changed, and it was observed whether or not power could be fed by contactless power feeding and whether or not data could be communicated. ..

Specifically, the gypsum board 31 was a tiger board manufactured by Yoshino Gypsum Co., Ltd., and the foam (XPS) 32 was a Styrofoam IB manufactured by Dow Kako Co., Ltd. The thickness of the foam (XPS) 32 was adjusted between 50 m and 120 mm by laminating one or more sheets to adjust the thickness of the foam used in the experiment. As shown in FIG. 4, a power receiving coil 11 connected to the sensor, a PC and a stabilizing power source are provided above and below a laminated body corresponding to a heat insulating material including a gypsum board 31, a foam (XPS) 32 and an aluminum vapor deposition layer 33. The connected power transmission coil 21 was arranged and it was confirmed whether power feeding and communication were possible.

A voltage of 5 V was applied from the stabilized power supply, and the DC/DC converter 22 in the power transmission coil 21 boosted the voltage. The voltage was boosted according to the distance so that the current value was 0.5 A. The power transmission efficiency (observed by the voltage at the time of non-boosting) in the power receiving coil 11 when V=5V and A=0.5A on the power transmission side was calculated. The power transmission efficiency can be calculated by the following formula.
Power transmission efficiency (%)=power on receiving side (W)/power on transmitting side (W)×100

When the coil diameters of the power receiving coil 11 and the power transmitting coil 21 are 70 mm, it is possible to communicate whether the power transmission distance, the power transmission efficiency, the thickness of the aluminum vapor deposition layer (hereinafter, also simply referred to as the thickness of aluminum), whether power can be supplied or not Whether or not is shown in Table 1. If the power can be supplied, it is represented by "O", if the power cannot be supplied, it is represented by "X". The symbols "o" and "x" have the same meanings in the other experimental result tables.

When the coil diameters of the power receiving coil 11 and the power transmitting coil 21 are 100 mm, Table 2 shows the power transmission distance, the power transmission efficiency, the thickness of the aluminum vapor deposition layer, whether power can be supplied, and whether communication is possible.

When the coil diameters of the power receiving coil 11 and the power transmitting coil 21 are set to 150 mm, the following table shows the power transmission distance, the power transmission efficiency, the thickness of the aluminum vapor deposition layer, whether power can be fed, and whether communication is possible. ..

When the coil diameters of the power receiving coil 11 and the power transmitting coil 21 are set to 200 mm, the following table shows the power transmission distance, the power transmission efficiency, the thickness of the aluminum vapor deposition layer, whether power can be fed, and whether communication is possible. .. Here, with respect to whether or not power can be supplied, the symbol “Δ” means an unstable state when power supply or communication fails and sometimes succeeds.

From the results shown in Tables 1 to 4 obtained when the coil diameters are 70 mm, 100 mm, 150 mm, and 200 mm, the following table summarizes the relationship between the coil diameter, the power transmission distance, and the aluminum thickness (aluminum vapor deposition thickness). 5 shows.

A plot of Table 5 in a graph is shown in FIG. FIG. 5 is a graph showing a relationship between a coil diameter capable of power supply and a vapor deposition thickness based on an experimental result obtained by changing a power transmission distance of non-contact power supply of a small wireless vacuum gauge. When the coil diameters are 150 mm and 200 mm, the aluminum thicknesses of the power transmission distances of 92 mm and 112 mm are the same, so the plot of the experimental results for the power transmission distance of 112 mm is omitted in the graph of FIG.

Referring to FIG. 5, in the result obtained in this experiment, when the power transmission distance is extended, the total thickness (vapor deposition thickness) of the aluminum vapor deposition layer is y, and the coil diameter is x, the vapor deposition thickness and the coil diameter are It was confirmed that the coefficient (slope) a of the relational expression (linear function) y = ax+b (where a and b are integers) becomes small. This is because power transmission efficiency decreases as the power transmission distance increases, and power cannot be supplied if the aluminum layer is thick.

１５０ｍｍのコイル径で２０００Åのアルミ蒸着層の合計の厚みをもったフィルムに対し、１１２ｍｍの給電・通信距離で送電効率１０％以上を達成する事を確認した。これ以上出力が落ちると、安定した通信が不可能であった。コイル径を小さくすることで磁界が弱まる為、送電距離は低下した。 For example, Table 6 shows a result in which the power transmission efficiency is summarized for each power transmission distance from the results shown in Table 3 obtained when the coil diameter is 150 mm. Table 6 shows that the transmission efficiency decreases as the transmission distance increases.

It was confirmed that a film having a total thickness of 2000 Å aluminum vapor deposition layer with a coil diameter of 150 mm achieved a power transmission efficiency of 10% or more at a power feeding/communication distance of 112 mm. If the output drops further, stable communication was impossible. Since the magnetic field is weakened by reducing the coil diameter, the power transmission distance is reduced.

Referring to FIG. 5 again, the small wireless vacuum gauge 10 can satisfactorily perform non-contact power supply and wireless communication within a range in which the total thickness of the aluminum vapor deposition, which is the gas barrier property of the vacuum heat insulating material, is 500 Å or more and 6000 Å or less. The diameter of the coil 11 and the power transmission coil 21 is 74 mm or more and 200 mm or less. This range is affected by a heat bridge, but it is a structure that can transmit power to some extent even in a thick structure. A thermal bridge is a phenomenon in which the pillars/beams between the outer wall and the inner wall transfer heat. The pillars/beams other than the heat insulating material are easily transferred to the inside and outside of the building and are called thermal bridges.

In a more preferable range in which the influence of the thermal bridge is smaller, the thickness of the aluminum vapor deposition layer that is responsible for the gas barrier property of the vacuum heat insulating material is 500 Å or more and 2000 Å or less, and the diameters of the power receiving coil 11 and the power transmitting coil 21 are 74 mm or more and 200 mm or less. The total thickness of the vapor-deposited aluminum layer (vapor-deposited thickness) must be at least 500 Å or more to obtain good gas barrier properties in the vacuum heat insulating material, but if it exceeds 2000 Å, the heat will be transmitted through the metal part and the heat will flow. Will be greatly affected. Further, it is possible to perform stable non-contact power supply and wireless communication even in a range where the total thickness of the aluminum vapor deposition layer is 500 Å or more and 2000 Å or less and the coil diameters of the power receiving coil 11 and the power transmitting coil 21 are 100 mm or more and 150 mm or less. It is a more preferable range.

Considering the experimental results shown in FIG. 5, when the power transmission distance between the power receiving coil 11 and the power transmitting coil 21 is 112 mm or less, the total thickness of the aluminum vapor deposition layer of the film capable of transmitting power is y, and the coil diameter is x. The range in which the slope coefficient a obtained from the linear function represented by the relational expression y=ax+b (where a and b are integers) is 30 or more is a preferable range as a range for performing non-contact power feeding and wireless communication. is there. Further, when the power transmission distance between the power receiving coil 11 and the power transmitting coil 21 is 62 mm or more and 132 mm or less, the total thickness of the aluminum vapor deposition layer of the film capable of power transmission is y, and the coil diameter is x. Relational expression y=ax+b The range in which the coefficient a of the slope obtained from the linear function expressed by is not less than 30 and not more than 45 is a preferable range as a range for performing non-contact power feeding and wireless communication. Further, when the coil diameter x of the power receiving coil 11 is 74 mm≦x≦200 mm, non-contact power feeding and wireless communication are performed in a range where the total thickness y of the aluminum vapor deposition layer is 30x-4000≦y≦45x-2837. This is a preferable range.

FIG. 6 is a block diagram showing a component configuration of a small wireless vacuum gauge included in a vacuum heat insulating material according to another embodiment of the present invention. A small wireless vacuum gauge 10' according to another embodiment includes, for example, a power receiving coil 11, a DC/DC converter 12, a CPU/wireless transmission unit 13, an A/D converter 14, and an operational amplifier (OP) on a substrate. It includes an AMP) 15 and a pressure sensor 16, and may further include a temperature/humidity sensor/internal clock 17. The temperature/humidity sensor/internal clock 17 connected to the CPU/wireless transmission unit 13 can directly transmit a signal to the CPU by serial communication such as I2C communication.

The CPU/wireless transmission unit 13 can wirelessly transmit a signal from the temperature/humidity sensor/internal clock 17 to an external reception unit. Even if there is no temperature/humidity sensor, the pressure sensor 16 can measure the pressure inside the vacuum heat insulating material. Therefore, if it is not necessary, it should be excluded from the configuration of the small wireless vacuum gauge 10'. Good. That is, the temperature/humidity sensor can be included in the small wireless vacuum gauge 10' as necessary, for example, to check the problem of the water vapor pressure invading the inside of the vacuum heat insulating material. Furthermore, a sensor for measuring various molecular species (carbon dioxide, carbon monoxide, oxygen, VOC, etc.) can be included in the small wireless vacuum gauge 10'. That is, the compact wireless vacuum gauge 10' may further include at least one of a temperature sensor, a humidity sensor, a sensor for measuring various molecular species, and an internal clock. Since the temperature sensor and the humidity sensor are affected by heat that can be generated by induction heating or the like, they can be provided separately from the power receiving coil 11. For example, since the temperature sensor and the humidity sensor are not affected by heat, they can be provided 30 mm or more away from the power receiving coil 11.

A vacuum heat insulating material including a small wireless vacuum gauge according to one embodiment and another embodiment of the present invention is a pressure sensor which is provided to a small wireless vacuum gauge provided inside an outer layer without electrical connection with an external power source. A non-contact power feeding unit for supplying electric power to the power receiving unit is provided, and the DC/DC converter connected to the power receiving coil in the non-contact power feeding unit causes the electricity generated in the power receiving coil to be stepped down or stepped up to a constant voltage. Can be maintained. With such a non-contact power supply unit, it is not necessary to provide a small wireless vacuum gauge with a battery that cannot maintain a constant voltage due to a reduction in the remaining amount, and an output signal can be stably obtained from the pressure sensor.

In addition, the coil diameter of the power receiving coil used for power supply to the pressure sensor and communication with the pressure sensor should be set appropriately according to the distance from the power transmission coil (power transmission distance) and the thickness of the aluminum vapor deposition layer that is the gas barrier film. By setting the range in which communication and power transmission are possible, stable power supply to the small wireless vacuum gauge can be realized, and communication with the small wireless vacuum gauge can be continuously performed without interruption.

INDUSTRIAL APPLICABILITY The vacuum heat insulating material according to the present invention can be used for an outer wall of a house or a plant in order to efficiently use heat energy. In particular, it can be used for long-term operation and performance prediction of the vacuum heat insulating material by measuring the heat insulating performance after construction of the vacuum heat insulating material.

10: Small wireless vacuum gauge 10': Small wireless vacuum gauge 11: Power receiving coil 12: DC/DC converter 13: Wireless transmission unit 14: A/D converter 15: Operational amplifier 16: Pressure sensor 17: Temperature/humidity sensor/internal 20 : Power transmission device 21: power transmission coil 22: DC/DC converter 23: PC/stabilized power supply 31: gypsum board 33: aluminum vapor deposition layer

Claims (12)

In a vacuum heat insulating material including a core material, an aluminum vapor deposition layer that is a gas barrier film covering the core material, and an outer layer provided outside the aluminum vapor deposition layer, and vacuum-sealing the inside,
The vacuum heat insulating material includes a small wireless vacuum gauge inside the outer layer,
The compact wireless vacuum gauge includes at least a pressure sensor, a non-contact power supply unit for supplying electric power to the pressure sensor, and a transmission unit for transmitting measurement data including at least a pressure value measured by the pressure sensor. Including,
The small wireless vacuum gauge does not include a battery for supplying power to the pressure sensor,
The non-contact power feeding unit includes a power receiving coil that is contactlessly fed from a power transmitting coil included in a power transmitting side device, and a DC/DC converter connected to the power receiving coil.
The DC/DC converter maintains a constant voltage by increasing or decreasing the electricity generated in the power receiving coil ,
A relational expression y=ax+b (however, the total thickness of the aluminum vapor deposition layer of the film capable of transmitting power when the power transmission distance between the power receiving coil and the power transmitting coil is 112 mm or less is y and the coil diameter is x=ax+b (however, a and b are the vacuum heat insulating material coefficient a gradient obtained from the linear function represented by an integer) is characterized Rukoto a more than 30. The total thickness of the aluminum deposited layer is at 500Å or more 6000Å or less, the vacuum heat insulating material according to claim 1, the coil diameter of the power receiving coil is equal to or less than than 74 mm 200 mm. The vacuum heat insulating material according to claim 1 , wherein the aluminum vapor deposition layer has a total thickness of 500 Å or more and 2000 Å or less and a coil diameter of the power receiving coil is 74 mm or more and 200 mm or less. When the power transmission distance between the power receiving coil and the power transmitting coil is 62 mm or more and 132 mm or less, the total thickness of the aluminum vapor deposition layer of the film capable of power transmission is y, and the coil diameter is x. Relational expression y=ax+b( However, the coefficient a of the gradient obtained from a linear function expressed by a and b is an integer) is 30 or more and 45 or less, The vacuum heat insulating material according to claim 1. When the coil diameter x of the power receiving coil is 74 mm ≦ x ≦ 200 mm, according to claim 4, the total thickness y of the aluminum deposition layer is characterized by a 30x-4000 ≦ y ≦ 45x- 2837 Vacuum insulation. The vacuum heat insulating material according to claim 1, wherein the aluminum vapor deposition layer has a total thickness of 500 Å or more and 2000 Å or less and a coil diameter of the power receiving coil is 100 mm or more and 150 mm or less. The non-contact power feeding unit, of claims 1-6, characterized in that it uses an electromagnetic induction method is a method for transferring power by utilizing an induced magnetic flux generated between said power receiving coil and the transmitting coil Vacuum heat insulating material given in any 1 paragraph. The power receiving coil and the power transmitting coil are respectively included in a resonance circuit,
The non-contact power feeding unit is a method of magnetic field resonance in which vibration of a magnetic field generated by a current flowing through the power transmission coil is transmitted to the power receiving coil that resonates at the same frequency to cause magnetic field resonance to transmit power. vacuum heat insulating material according to any one of claims 1 6, characterized in that with. The transmission unit in the same frequency band or less of the frequency band and the frequency band used in a non-contact power supply, vacuum heat insulating material according to claim 7 or 8, characterized in that the transmission of the measurement data. The small radio vacuum gauge, a temperature sensor, a humidity sensor, a vacuum according to any one of claims 1 9, characterized in that it further comprises at least one of the sensors and internal clock for measuring the various molecular species Insulation. The vacuum heat insulating material according to claim 10 , wherein the temperature sensor and the humidity sensor are isolated from the power receiving coil. The vacuum heat insulating material according to claim 11 , wherein the temperature sensor and the humidity sensor are separated from the power receiving coil by 30 mm or more.

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