JP2009299967A - Hot water storage unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage unit improved in scattering prevention properties of a heat insulating material used in a heat retaining tool, a deaeration packaging property and handling workability, with respect to the hot water storage unit composed of a hot water storage tank and the heat retaining tool covering an outer layer section. <P>SOLUTION: In this hot water storage unit constituted by covering the outer layer section of the metallic hot water storage tank with the heat insulating material received in a bag, the heat insulating material is mainly composed of inorganic fiber molding having a fiber diameter of 0.1-15 μm, the bag is composed of breathable cloth and an unbreathable film, an area of the cloth is 5-70% to the total area of the bag, and end joint strength of the bag is 1 N/25 mm or more. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hot water storage device. More particularly, the present invention relates to a hot water storage device in which a metal hot water storage tank for storing hot water is covered with a heat insulating material containing a heat insulating material in a bag made of a breathable fabric and a non-breathable film.

Conventionally, asbestos, rock wool, glass wool, glass fiber, and the like have been widely used as heat insulating materials because of their excellent characteristics such as incombustibility, heat retention, and price.
However, during handling operations such as slitting, drilling, and cutting, inorganic fibers are scattered in the air and contact with the operator's skin, resulting in workability such as tingling and environmental problems. As a countermeasure, polyethylene film for preventing scattering is used. The above problem can be prevented by putting a heat insulating material in a bag of non-breathable film, but it cannot be deaerated and becomes a bulky bag. It is a situation that is responding by reducing.
In addition, as a heat retention measure for a hot water storage device, a polystyrene resin foam molded body molded into a hot water storage shape is used. This measure is excellent in heat retention, but if the shape of the hot water storage is changed, a cost such as the need for a mold is required, and it is bulky, requiring a large work space and transportation cost. There are problems such as high.

In Patent Document 1, an organic fiber nonwoven fabric and an inorganic fiber mat are stacked and needle punched from the organic fiber side to prevent inorganic fibers from scattering. According to this, although the densification heat-insulating material improves the moldability and the like, there is a problem that the prevention of scattering of the heat-insulating material cannot be improved.
As the surface material for preventing the scattering of glass fibers, asbestos paper, asphalt-impregnated paper, and the like have been used, but there is a problem that environmental and sanitary problems are concerned and the use is limited.
Patent Document 2 proposes to mix alumina sol at the time of paper production. However, there is a limit to the yield of alumina, and there is a problem that the effect of flame retardancy is insufficient.
Patent Document 3 proposes to use a silicone resin. However, in order to obtain sufficient flame retardancy, there is a problem that the blending amount must be increased.
Patent Document 4 proposes the combined use of a flame-retardant inorganic powder and a binder. In order to make the flame retardance sufficient, there is a problem that the amount of adhesion increases and the texture becomes hard.
Furthermore, for the purpose of obtaining flame retardancy, it is conceivable to add a flame retardant to the thermoplastic synthetic fiber nonwoven fabric, but there are problems such as corrosion when used as a heat insulating material for steel pipes such as copper, aluminum and iron. occured.

JP-A-11-218772 JP-A-57-205600 JP 54-068470 A Japanese Patent No. 3256019

The subject of this invention is solving the said conventional problem.
That is, a hot water storage device in which an outer layer portion of a metal hot water storage tank for storing hot water is covered with a breathable heat insulating material in which a heat insulating material is housed in a bag-like material. It is intended to provide a hot water storage device using a heat retaining device that is excellent in heat retaining property, can prevent scattering of inorganic fibers, and is excellent in handling workability and transport packing property.

  As a result of intensive studies to solve the above problems, the present inventors have insulated the outer layer portion of the metal hot water storage tank into a bag-like material having a specific occupation ratio of a fabric having air permeability and a film having shielding properties. The present invention has reached the present invention by discovering a hot water storage device that is excellent in prevention of scattering of the heat insulating material, and excellent in workability and heat retaining property by covering with a heat retaining device containing the material. The invention claimed in the present application is as follows.

1. A hot water storage device in which an outer layer portion of a metal hot water storage tank is covered with a heat insulator in which a heat insulating material is stored in a bag-like material, and the heat insulating material is made of an inorganic fiber molded body having a fine diameter of 0.1 to 15 μm. The bag-like material is composed of a breathable fabric and a non-breathable film, the occupation area of the fabric is in the range of 5 to 70%, and the end-joining strength of the bag-like material is 1 N / A hot water storage device characterized by being 25 mm or more.
2. ^2. The hot water storage apparatus according to 1 above, wherein the bag-like product has a fabric breathability of 10 to 400 cc / cm ² / sec and a non-breathable film thickness of 10 to 100 μm.
3. 3. The hot water storage device according to 1 or 2 above, wherein in the bag-like product, the fabric is a nonwoven fabric, the diameter of the constituent fibers is 1 to 30 μm, and the basis weight is 10 to 100 g / m ² .
4). The hot water storage device according to any one of the above items 1 to 3, wherein in the bag-like material, the fabric has flame retardancy.
5. 4. The hot water storage device according to 3 above, wherein the nonwoven fabric is a polyester-based long-fiber nonwoven fabric.

6). 4. The hot water storage device according to 3 above, wherein the bag end portion is joined with a hot-melt adhesive in the bag-like product.
7). The hot water storage device according to any one of the above 1 to 6, wherein the inorganic fiber molded body has a bulk density of 5 to 300 kg / m ³ .
8). 8. The hot water storage apparatus according to any one of the above 1 to 7, wherein the inorganic fiber molded body is a rock wool, glass wool, glass fiber needle mat, and a laminated body of glass wool and glass fiber needle mat.
9. The hot water storage apparatus according to any one of the above 1 to 8, wherein the inorganic fiber molded body is formed to have a thickness of 1 to 300 mm, a width of 5 to 2000 mm, and a length of 10 to 40,000 mm.
10. The inorganic fiber molded body is subjected to partial punching processing and partial slit processing of round, square, triangular and irregular shapes in at least one place, and the periphery of the end portion of the partially processed portion is sealed with the film. 10. The hot water storage device according to any one of 1 to 9 above.

  The hot water storage device of the present invention is formed by covering the outer layer of a metal hot water storage tank with a heat insulating material, and the heat insulating material contains a heat insulating material in a bag made of a breathable fabric and a non-breathable film, and is sealed and packaged It is a thing. Accordingly, the scattering of the fibers can be prevented and the heat retaining property is excellent, so that it can be widely used in hot water storage devices such as electric water heaters, gas water heaters, eco water heaters, and thermos bottles.

The heat insulator used for the hot water storage device of the present invention is a bag-like material containing a heat insulating material. Specifically, a heat insulating material made of an inorganic fiber molded body is stored in a bag made up of a breathable fabric consisting of 5% to 70% of the total bag area and a non-breathable film. Filled and sealed are preferred.
The fabric preferably has an appropriate air permeability, does not scatter the heat insulating material, and has an air permeability that allows vacuum degassing. By vacuum degassing of the heat insulator, it can be made compact, and transport efficiency and handling are greatly improved.
The film is non-breathable and can completely shield the insulation and prevent scattering.
By setting the occupation area of the fabric and the film to a specific ratio, it is possible to form a bag-like product having excellent air permeability and shielding properties.

As a specific configuration of the bag used in the present invention, a breathable fabric is provided in at least one location of the non-breathable film. For example, 5% or more and 70% or less, preferably 10 to 60% of the total bag area is configured to have a breathable fabric.
When the area ratio of the fabric is less than 5%, the air permeability of the bag is lowered, the deaeration packing property is lowered when the heat insulating material is stored, the air inside the bag is increased, and the bag body becomes bulky, and the handleability is lowered. During the degassing packaging, tearing or the like is likely to occur. On the other hand, if it exceeds 70%, the air permeability is increased, but the deaeration packing property is improved, but the flexibility, the covering property, the price, etc. are problematic.

The fabric used in the present invention may be any fabric having air permeability of 10 to 400 cc / cm ² / sec, preferably 20 to 350 cc / cm ² / sec, such as non-woven fabric, mesh-like material, walliff, tape-like cloth, net A woven fabric, a knitted fabric or the like is preferably used. More preferred are non-woven fabrics and woven or knitted fabrics from the viewpoint of handling properties and heat shielding properties. In particular, a non-woven fabric is preferable from the viewpoint of handling properties such as no need for treatment of a cut surface.
When the air permeability is less than 10 cc / cm ² / sec, it takes a lot of breakage due to compression at the time of deaeration packing and a deaeration time. On the other hand, if it exceeds 400 cc / cm ² / sec, the deaeration time can be shortened, but the scattering prevention property decreases.

The nonwoven fabric used for the bag-like material of the present invention is composed of short fibers, long fibers, and combinations thereof having a fine diameter of 1 to 30 μm, preferably 7 to 25 μm, and has flexibility, strength, air permeability, and shape following ability. It is necessary to be excellent.
Nonwoven fabric manufacturing methods include a spunbond method of a melt spinning method in which a synthetic resin is melted, a thermal bond method in which binder fibers are mixed, a columnar entanglement method, a needle punch method, a flash spinning method, a meltblowing method, etc. It is obtained by 2 or more types.
Although it does not specifically limit as a constituent fiber of a nonwoven fabric, it is thin, it is excellent in intensity | strength, and it is excellent in covering property, For example, polyester-type fibers, such as polyethylene terephthalate, polybutylene terephthalate, copolymer polyester, nylon 6 , Nylon 66, polyamide fibers such as copolyamide fiber, olefin fibers such as polyethylene, polypropylene, copolypropylene, rayon fiber, cellulose fiber, acrylic fiber, sheath is low melting point such as polyethylene, polypropylene, copolyester Synthetic fibers such as composite fibers such as a component and a core-sheath structure in which the core is a high-melting-point component shell such as polyethylene terephthalate, polybutylene terephthalate, nylon 6, and side-by-side structure, among which polyester-based long fibers, Heat, excellent flame retardancy, bag-making processability, strength is large, from the viewpoint of excellent thermal processability, is preferably used.

  The fabric used for the bag-like product of the present invention preferably has flame retardancy, and it is a preferred embodiment that the thermal insulation does not spread when burned and has self-digestibility. The flame retardancy of a fabric includes a raw material flame retardant method in which a flame retardant is kneaded into a raw material resin, or a method in which a flame retardant is applied to a fabric. The metal hot water storage tank is not particularly limited as long as it does not cause corrosion, but the kneading type is preferable in terms of preventing corrosion because the flame retardant is not exposed on the fiber surface.

For example, flame retardants include non-halogen phosphate esters such as trimethyl phosphate, triethyl phosphate, tributyl phosphate, triphenyl phosphate, tricresyl phosphate, and special phosphate esters such as polyphosphate and aromatic polyphosphate. , Halogen-containing phosphoric acid esters, decabrominated brominated flame retardants such as decabromodiphenyl oxide and octabromodiphenyl oxide, melamine based flame retardants, guanidine phosphate derivatives, phosphorous nitrogen compounds, aluminum hydroxide, hydroxylated One or more inorganic fillers such as magnesium and calcium carbonate are added at 0.5 to 30 wt%, preferably 0.1 to 20 wt%. In particular, an ester copolymer of dimethyl terephthalate / ethylene glycol containing 0.3 to 3 wt% of non-halogen phosphate such as 3-methylphosphinicopropionate is preferably used.
Further, it is preferable to adjust the flame retardancy by mixing acrylic flame retardant fiber, ester flame retardant fiber or the like.

  The long-fiber non-woven fabric used in the present invention is thin, and becomes a thin fabric excellent in flexibility and strength. For example, it is joined by heating and pressure bonding between an embossing roll having irregularities and a smooth roll. The heating temperature is a temperature range from the temperature above the softening temperature of the fiber to below the melting point. However, in consideration of thermal degradation of the low melting point fiber, the temperature difference between the upper and lower rolls is 150 ° C. or less, preferably 130 ° C. or less. The pressure of thermocompression bonding is 10 to 1000 kPa / cm, preferably 50 to 700 kPa / cm.

The partial thermocompression bonding rate of the long-fiber nonwoven fabric is preferably 5 to 35%, more preferably 7 to 30%. The embossed pattern is preferably arranged in a uniform manner such as a parallel uniform arrangement or a staggered arrangement such as a round shape, an elliptical shape, a rhombus shape, a cylindrical shape, or a square shape. Thermocompression bonded portions one of area, 0.3 to 1.5 mm ^2, preferably a 0.4 to 1.2 mm ^2, the distance between the thermocompression bonding, 0.3 to 3 mm, preferably, 0.5 Distribute equally 2.5 mm.
When the partial thermocompression bonding rate is less than 10%, the bonding area decreases and the wear strength decreases. On the other hand, if it exceeds 30%, the wear strength increases, but the texture becomes paper-like.
The fabric weight of the fabric of the present invention is 10 to 100 g / m ² , preferably 15 to 80 g / m ² . When the basis weight is less than 10 g / m ² , the denseness of the fibers is reduced, the gaps are widened, and even if covered, the scattering prevention property of the heat insulating material is lowered. On the other hand, when it exceeds 100 g / m ² , the heat-preventing material is prevented from being scattered, but the texture becomes hard, the thickness is increased, and the bag-making processability of the bag body is lowered.

The non-breathable film used for the bag of the present invention has a thickness of 10 to 100 μm, preferably 15 to 70 μm, can prevent scattering of inorganic fibers, cannot be broken by filling work, packing work, transportation, etc. It is necessary that the bag-making workability with the fabric is excellent.
Therefore, for example, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, other ethylene resins, polypropylene resins, Polybutene resin, olefin resin, ethylene-acrylic acid copolymer, ethylene-methyl acrylate copolymer, polyvinyl chloride resin, polyvinylidene chloride resin, 6-nylon, 66-nylon, polyamide resin, etc., A thermoplastic resin in which two or more kinds are combined is used.
The non-breathable film used for the bag of the present invention preferably has flame retardancy. Accordingly, it is preferable to add 0.1 to 30 wt% of a flame retardant to the resin to make a flame retardant film. For example, one type or two or more types of inorganic fillers such as brominated flame retardants, melamine flame retardants, guanidine phosphate derivatives, phosphorous nitrogen compounds, aluminum hydroxide, magnesium hydroxide, and calcium carbonate are used.

  In the bag used in the present invention, the breathable fabric is 5% or more and 70% or less, preferably 10% to 60% with respect to the total area of the bag. Therefore, the shape of the bag is not limited as long as the heat insulating material can be stored. For example, a cylindrical shape, a three-side sealed flat bag, a side gusset bag, or the like is used. As a specific example, (1) a non-breathable single-sided film, a bag in which two sheets of breathable fabric are bonded to the other side, (2) a non-breathable film on one side and a breathable fabric joined to the other side. A two-ply bag with a non-breathable film can be selected.

The bag making process of the bag used in the present invention is not particularly limited, but the seal width is 1 mm to 20 mm, preferably 3 mm to 15 mm, and the bonding strength is 1 N / 25 mm or more, preferably 2 N / 25 mm to 100 N. / 25 mm. If the bonding strength is less than 1 N / 25 mm, problems such as bag breakage due to filling work of the heat insulating material, deaeration work, and the like are likely to occur.
As a joining method, processing is performed by a fusion method such as heat sealing, ultrasonic sealing or high frequency sealing, or an adhesive method such as hot melt resin or adhesive resin, or sewing sewing such as sewing thread.
Adhesive type resins include one or more of polyethylene resins, polypropylene resins, copolymer polyethylene resins, copolymer polypropylene resins, ethylene-vinyl acetate resins, polyamide resins, polyester resins, and the like. These resins are used.

Since the heat insulation used in the present invention is housed in a bag having air permeability, it is possible to select inorganic fiber molded bodies having different materials, thicknesses, densities, fiber diameters, and the like.
In the case of the hot water storage device used in the present invention, hot water is accumulated at the upper part of the tank by the heater at the lower part of the tank, so that the temperature at the upper part of the tank is high and the temperature at the lower part of the tank is low. For example, a relatively low temperature region (0 to 70 ° C.) is configured as a heat insulator having a low bulk density, and a high temperature region (70 to 95 ° C.) is a heat insulator in which a glass fiber needle mat having a high bulk density is laminated. By using the configuration, more effective heat retention can be achieved.
Specific examples, the thermal insulation member of the low-temperature region, thickness, 15～100Mm, preferably 20 to 70 mm, a bulk density of 5~30kg / ^{m 3,} preferably 10~25kg / ^{m 3.} As the high-temperature region, a high-density heat insulator having a thickness of 1 to 15 mm, preferably 2 to 10 mm, and a bulk density of 80 to 500 kg / m ³ , preferably 90 to 200 kg / m ³ , and a low-density heat insulator are combined. More effective heat retention can be obtained by using a heat retainer.

The inorganic fiber molded body used in the present invention is composed of rock wool, glass wool, glass fiber needle mat having a fine diameter of 0.1 to 15 μm, preferably 0.5 to 10 μm, and a laminate of glass wool and glass fiber needle mat. The shape can be freely selected according to the desired shape of the hot water storage tank. A fine diameter of 0.1 μm or less is a dense structure and has excellent heat retention properties, but the scattering property of the fibers increases and it becomes difficult to maintain the thickness. On the other hand, when the fine diameter exceeds 15 μm, rigidity and thickness retainability are increased, but there are problems such as a coarse structure and a decrease in heat retention.
For example, the thickness is 1 to 300 mm, preferably 3 to 250 mm, the width is 5 to 2000 mm, preferably 7 to 1500 mm, the length is 10 to 40000 mm, preferably 20 to 35000 mm, and the bulk density is 5 to 300 kg / m ³ is preferred. When the bulk density is low, the thermal conductivity can be lowered, but the thickness retainability is lowered. On the other hand, when the bulk density is high, the thermal conductivity is slightly high, but the thickness retention is improved and the thermal conductivity is slightly low in the high temperature region. (Temperature dependence varies depending on bulk density, low bulk density is somewhat high temperature dependence, while high bulk density is somewhat low temperature dependence.)
Further, the outer shape is not particularly limited from a narrow tape shape to a shape such as a circle or square, or a shape covering a large area.

Furthermore, a hot water storage tank having attachment parts such as steel pipes, electrical parts, and electrical wiring is molded into an inorganic fiber molded body for the purpose of keeping warm. For example, as a forming process, for example, at least one part such as a square shape, a rectangular shape, or a round shape is subjected to partial punching processing of a round shape, a square shape, a triangular shape, or an irregular shape, a partial slit shape, a tape shape, or the like. The Accordingly, the shape of the heat insulating material is not particularly limited, but the entire periphery of the inorganic fiber molded body needs to be sealed and coated by joining the end portions of the nonwoven fabric.
Partially slitting and punching parts repair methods include, for example, installing a tubular film or non-woven fabric having a size of a heat insulating material and a bonded portion on the repairing part, and heating or bonding from above and below. Adhesive sheet and hermetically packaged.
In the above-mentioned forming process, prior to the on-site assembly work of the hot water storage device, if the forming process is performed in advance in another place and stored in a bag-like product, then degassed as a heat insulation package and transported, During transportation, the handling of site construction is greatly improved. Furthermore, there is no complication in the on-site assembly work of the hot water storage device, and the scattering of the heat insulating material is reduced.

The heat insulator used in the hot water storage apparatus of the present invention is a bulky inorganic fiber molded body housed in a bag having air permeability. Therefore, when storing and transporting in a bulky state, there are problems that a large storage space is required and the transportation cost is increased. As a countermeasure, the storage space can be extremely reduced and the transportation cost can be reduced by compressing or deaeration packing.
Specifically, 3 to 50 bags of heat insulators can be stacked and pressed to be compressed compactly, and further put into a non-breathable film and degassed for more compact packaging. .
In the hot water storage device of the present invention, the outer layer portion of a metal tank such as stainless steel is covered with a heat insulator. Usually, a cylindrical tank is required to obtain a good heat retaining property so that there is little deformation in thickness and there is no gap.
The heat insulator used in the present invention has flexibility that is easy to adjust to the shape of the tank, and can be easily attached with a fastener such as a string, an adhesive tape, a staple, a clip or the like in the attaching operation.
The thermal conductivity of the storage bag used in the present invention is increased in the high temperature region, and the thermal conductivity is improved. The thermal conductivity is preferably in the range of 0.02 to 0.04 Kcal / mh ° C. at 20 ° C., and the thermal conductivity in 90 ° C. is preferably in the range of 0.03 to 0.05 Kcal / mh ° C.

The present invention will be described based on examples.
The measurement method is as follows.
(1) Weight per unit area (g / m ² ): A sample having a length of 20 cm × width of 25 cm is cut out at three locations, the weight is measured, and the average value is calculated by converting it into mass per unit.
(JIS-L-1906)
(2) Average fiber diameter (μm): Take a 500-fold magnified photograph with a microscope, and determine the average value of 10 fibers.
(3) Thickness (mm): Conforms to JIS-L-1906 with a load of 10 kPa.
(4) Average apparent density (g / cm ³ ): obtained from basis weight / thickness.
(5) Breathability: Conforms to JIS-L-1906 Frajour method.
(6) Dust generation: Dust is generated by hitting the sample surface with a metal rod. Next, the dusted glass fibers were collected in a suction funnel, and the number of the collected fibers was measured using a microscope.
Dust generation conditions: shaking speed 210 times / minute, time 3 minutes

(7) Corrosiveness: Cut copper metal plate into 2 cm square, cut out 5 cm square of 2 sheets of nonwoven fabric, use 2 sheets of 5 mm thick glass plate, and put on glass plate / nonwoven fabric / copper plate / nonwoven fabric / glass plate, The treatment was performed in a constant temperature and high humidity tank with a load of 1 kg / cm ² and a temperature of 65 ° C. × humidity of 85% for 7 days, and the corrosion state was observed and judged according to the following criteria.
Grade 5: No discoloration or corrosion of the surface of the metal piece.
Grade 4: There is a slight discoloration of the surface of the metal piece.
Third grade: The surface of the metal piece is slightly discolored and corroded, but is not noticeable.
Second grade: There is little discoloration and corrosion of the surface of the metal piece.
First grade: Discoloration / corrosion of the surface of the metal piece is severe.

(8) Tensile strength (N / 5 cm): Using a constant-length tensile tester, cut a sample width of 5 cm and a length of 30 cm, measure the tensile strength at 3 points each in the vertical and horizontal directions at a gripping interval of 20 cm and a tensile speed of 10 cm / min. The average value of maximum strength (vertical + horizontal) / 2 is shown.
(9) Joining strength (N): Using a constant-length tensile tester, a sample width of 25 mm and a length of 200 mm are cut off, the joining part is peeled off by about 50 mm in the vertical direction, and each is attached so as to peel 180 degrees. The tensile strength is 10 cm / min, and the peel strength is measured at three points each for length and width, and the average value of the maximum strength is indicated.
(10) Flame retardancy: Conforms to JIS-L-1091 A-3 method (horizontal method).
Pass: Combustion length 10 cm or less Remaining time 20 seconds or less (11) Thermal conductivity (Kcal / mh ° C.): According to JIS-A-9505 line comparison method.

[Example 1]
Polyethylene terephthalate is spun from a spinneret for spunbond, an average fiber diameter of 14 μm at a spinning temperature of 300 ° C., a basis weight of 50 g / m ² is formed on a collection net, and a crimp area ratio is 15% embossed roll, wire A long-fiber nonwoven fabric was obtained by thermocompression bonding at a pressure of 350 N / cm and an upper and lower temperature of 230 ° C./235° C.
Next, a bag of a low-density polyethylene film having a thickness of 30 μm and the long-fiber nonwoven fabric was prepared. Cut the film and non-woven fabric into 52 cm vertical and 62 cm wide, respectively, and stack two sheets, and heat-seal with a heating seal bar with a width of 3 mm at a temperature of 120 ° C. and a pressure of 3 kg / cm ² inside 1 cm of the end in three directions, A three-side sealed bag was obtained. The area occupied by the nonwoven fabric is 50%.
The three-side sealed bag was punched into a rectangular shape of 50 cm in thickness, fiber diameter 3 μm, bulk density 12 kg / m ³ in a rectangular shape having a length of 30 cm and a width of 40 cm, and the resulting inorganic fiber molded body was subjected to the above-described process. After storing in a three-side seal bag, it was hermetically packaged with a heat seal to obtain a heat insulator used in the hot water storage device of the present invention.
Table 1 shows the measurement results of dust generation and corrosivity of the obtained heat retaining device.
From Table 1, the heat insulator used for the hot water storage device of the present invention was excellent in dust generation, corrosivity, and heat retention.

[Example 2]
Polyethylene terephthalate through a spinneret for spun bond, average fiber diameter 12 [mu] m, to form a basis weight 30 g / m ² thermoplastic long fiber web on the collecting net at a spinning temperature of 300 ° C., crimping area ratio is 25% embossing roll, wire A long-fiber nonwoven fabric was obtained by thermocompression bonding at a pressure of 350 N / cm and an upper and lower temperature of 230 ° C./235° C. Subsequently, the bag which consists of a 30-micrometer-thick low density polyethylene film and the said long-fiber nonwoven fabric was manufactured as follows.
Cut the film 122 cm long, 202 cm wide, 122 cm long, 142 cm wide, cut the non-woven fabric 122 cm long and 31 cm wide, cut the length of the film 122 cm wide, 1 cm both sides of the 142 cm wide film and non-woven fabric Two pieces are stacked and the inner part of 1 cm is adhered with a heat seal bar having a width of 3 mm to obtain a breathable film. Next, two sheets of the non-breathable film and the breathable film are stacked and heat-sealed with a width of 3 mm from the end to a portion 1 cm from the inside to obtain a three-side sealed bag. (However, the heat seal is a temperature of 110 ° C. and a pressure of 3 kg / cm ² ) The occupied area ratio of the nonwoven fabric is 15%.
In the three-side seal bag, a glass wool having a thickness of 50 mm, a fiber diameter of 3 μm, a bulk density of 16 kg / m ³ , and a glass needle mat having a thickness of 5 mm, a fiber diameter of 7 μm and a bulk density of 120 kg / m ³ , each having a length of 100 cm, The inorganic fiber molded body punched into a square shape of 180 cm in width was stored in the three-side seal bag, and hermetically sealed with a heat seal to obtain a heat insulator used in the hot water storage device of the present invention.
Table 1 shows the measurement results of dust generation and corrosivity of the obtained heat insulating material.
From Table 1, the heat insulator used for the hot water storage device of the present invention was excellent in dust generation, corrosivity, and deaeration packing properties.

[Example 3]
A flame-retardant copolymerized polyethylene terephthalate copolymerized by adding 1.2 wt% of 3-methylphosphinicopropionic acid ester to ethylene glycol and dimethylene terephthalate was averaged at a spinning temperature of 290 ° C from a spunbond spinneret. A thermoplastic long fiber web having a fine diameter of 16 μm and a basis weight of 50 g / m ² is formed on a collection net, and heated at a crimping area ratio of 15% embossing roll, linear pressure of 350 N / cm, and vertical temperature of 220 ° C./225° C. The flame-retardant ester nonwoven fabric of Example 1 was obtained by pressure bonding.
Next, a bag of a low-density polyethylene film added with 15 wt% of a nitrogen compound melanin flame retardant having a thickness of 50 μm and the flame retardant long fiber nonwoven fabric was prepared. The film and non-woven fabric are cut into a length of 72 cm and a width of 72 cm, and two sheets are stacked, and 1 cm inside from each end in three directions is heated with a heating seal bar having a temperature of 120 ° C. and a pressure of 3 kg / cm ^{2 and} a width of 5 mm. Sealed to obtain a three-side sealed bag. The area occupied by the nonwoven fabric is 50%.
An inorganic fiber molded article obtained by punching a glass wool heat insulating material having a thickness of 50 mm, a fiber diameter of 3 μm, and a bulk density of 12 kg / m ³ into a square shape of 50 cm in length and 50 cm in width is formed in the three-side seal bag. After storing in a bag, it was hermetically packaged with a heat seal to obtain a heat insulator used in the hot water storage device of the present invention.
Table 1 shows the measurement results of dust generation and corrosivity of the obtained heat retaining device.
From Table 1, the heat insulator used for the hot water storage device of the present invention was excellent in dust generation, corrosivity, and deaeration packing properties.
[Example 4]
A hot water storage device according to the present invention was made using the heat retaining device of Examples 1 and 2 in a square metal tank made of stainless steel having a length of 30 cm, a width of 40 cm, and a height of 100 cm. At this time, the heat insulating tool of Example 2 was punched at two places for a supply pipe hole having a diameter of 7 cm. Thereafter, the punched hole was repaired using a non-ventilated film having a thickness of 30 μm to obtain a sealed package. (A cylindrical film having a diameter of 7 cm and a length of 15 cm was used to adhere from above and below with an iron having a surface temperature of 110 ° C.)
A hot water heater was filled with 95 ° C., and the temperature of the hot water after 8 hours was measured to be 91 ° C., which was the desired hot water storage device. Further, no corrosion that would be a problem in subsequent visual inspection occurred.

[Comparative Example 1] Glass wool without bag only Insulating fiber molded body obtained by punching a glass wool insulation material having a thickness of 50 mm, a fiber diameter of 3 μm, and a bulk density of 12 kg / m ³ into a rectangular shape of 50 cm in length and 50 cm in width. It was.
From Table 1, a lot of dust was generated from the heat insulator, which was a problem.

[Comparative Example 2] Non-breathable bag (only film)
A non-breathable film bag used in Example 1 is an inorganic fiber molded body obtained by punching a glass wool heat insulating material having a thickness of 50 mm, a fiber diameter of 3 μm, and a bulk density of 12 kg / m ³ into a square shape of 50 cm in length and 50 cm in width. I stored it.
Although there was no dust generation of a heat insulator from Table-1, it became a bulky packaging form, and workability | operativity and packing property became a problem.

[Comparative Example 3] Breathable bag with a fabric area of less than 5% The bag of Example 1 was changed to a fabric area of 2%. Others were performed in the same manner as in Example 1.
From Table 1, there is no dust generation of the heat insulation device, but it becomes a bulky packaging form, and workability and even if compressed repeatedly, the phenomenon that the air in the bag does not escape inside occurs, and it takes time for deaeration packaging There was a problem that it took a lot.

The hot water storage device of the present invention is formed by storing a metal hot water storage tank capable of storing hot water, with a heat insulating material housed in a bag, and covering the outer layer portion with a heat-insulating container filled and packaged. The heat insulating material is made of an inorganic fiber molded body such as glass wool, glass fiber, rock wool, etc., and the bag is composed of a breathable fabric and a non-breathable film, and the heat scattering of the heat insulating material can be prevented. The surface is not corroded, and the outer layer of the hot water storage tank can be easily attached to the cover, has excellent heat retention, can be compressed and can be made compact, and can be made compact.
Therefore, it can be widely used in hot water storage devices such as electric water heaters, gas water heaters, eco water heaters, and thermos bottles.

Claims (10)

  A hot water storage device in which an outer layer portion of a metal hot water storage tank is covered with a heat insulator in which a heat insulating material is stored in a bag-like material, and the heat insulating material is made of an inorganic fiber molded body having a fine diameter of 0.1 to 15 μm. The bag-like material is composed of a breathable fabric and a non-breathable film, the occupation area of the fabric is in the range of 5 to 70%, and the end-joining strength of the bag-like material is 1 N / A hot water storage device characterized by being 25 mm or more. ^2. The hot water storage device according to claim 1, wherein the air permeability of the fabric is 10 to 400 cc / cm ² / sec and the thickness of the non-breathable film is 10 to 100 μm. The hot water storage device according to claim 1 or 2, wherein in the bag-like product, the fabric is a non-woven fabric, the diameter of the constituent fibers is 1 to 30 µm, and the basis weight is 10 to 100 g / m ² .   The hot water storage device according to any one of claims 1 to 3, wherein in the bag-like material, the fabric has flame retardancy.   The hot water storage device according to claim 3, wherein the nonwoven fabric is a polyester-based long-fiber nonwoven fabric.   The hot water storage device according to claim 3, wherein in the bag-like product, bag end portions are joined with a hot-melt adhesive. The hot water storage device according to any one of claims 1 to 6, wherein the inorganic fiber molded body has a bulk density of 5 to 300 kg / m ³ .   The hot water storage device according to any one of claims 1 to 7, wherein the inorganic fiber molded body is a rock wool, glass wool, glass fiber needle mat, and a laminated body of glass wool and glass fiber needle mat. .   The hot water storage device according to any one of claims 1 to 8, wherein the inorganic fiber molded body has a thickness of 1 to 300 mm, a width of 5 to 2000 mm, and a length of 10 to 40,000 mm.   The inorganic fiber molded body is subjected to partial punching processing and partial slit processing of round, square, triangular and irregular shapes in at least one place, and the periphery of the end portion of the partially processed portion is sealed with the film. The hot water storage device according to claim 1, wherein the hot water storage device is a hot water storage device.