JP2017096539A - Hot water storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage type water heater capable of achieving both heat insulation capacity of a hot water storage tank and compactification of the water heater.SOLUTION: A hot water storage type water heater includes: a hot water storage tank 1 having a trunk part 1a; an inside vacuum heat insulation material 15 for covering the trunk part 1a at least partially; and an outside vacuum heat insulation material 16 arranged outside in the thickness direction with respect to the inside vacuum heat insulation material 15, and overlapped with the inside vacuum heat insulation material 15 in the whole area without sandwiching other heat insulation materials between itself and the inside vacuum heat insulation material 15. The inside vacuum heat insulation material 15 has a portion sandwiched between the hot water storage tank 1 and a molding heat insulation material 13. The outside vacuum heat insulation material 16 does not have the portion sandwiched between the hot water storage tank 1 and the molding heat insulation material 13.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hot water storage type water heater.

  The conventional hot water storage type water heater disclosed in Patent Document 1 below is a heat insulating member formed in a shape covering the hot water storage tank, and a position covering the trunk of the hot water storage tank, at the inner peripheral surface side or outer peripheral surface of the heat insulating member. A vacuum heat insulating material disposed on the side. The said heat insulation member consists of foamed plastics, such as a polystyrene foam.

JP 2011-237072 A

  A heat insulating member made of foamed plastic is inferior in heat insulating performance when the thickness is the same as that of a vacuum heat insulating material. In the conventional hot water storage type hot water heater described in Patent Document 1, in order to improve the heat retaining performance of the hot water storage tank, it is necessary to increase the thickness of the heat insulating member made of foamed plastic. For this reason, it is difficult to make the hot water storage type water heater compact.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hot water storage type water heater that can achieve both the heat retaining performance of the hot water storage tank and the compactness of the hot water storage type water heater. .

  A hot water storage type water heater according to the present invention is a hot water storage tank having a body part, a first vacuum heat insulating material that at least partially covers the body part, and is disposed outside in the thickness direction with respect to the first vacuum heat insulating material, A second vacuum heat insulating material that entirely overlaps the first vacuum heat insulating material without sandwiching another heat insulating material between the first vacuum heat insulating material and the first vacuum heat insulating material.

  According to the hot water storage type water heater of the present invention, it is possible to achieve both the heat retention performance of the hot water storage tank and the compactness of the hot water storage type water heater.

1 is a front view showing a hot water storage type water heater of Embodiment 1. FIG. It is a disassembled perspective view of the hot water storage tank and heat insulating material with which the hot water storage type water heater of Embodiment 1 is provided. It is a cross-sectional view of the hot water storage tank and the heat insulating material with which the hot water storage type hot water heater of Embodiment 1 is provided. It is a cross-sectional view of the hot water storage tank and the heat insulating material with which the hot water storage type hot water heater of Embodiment 1 is provided. FIG. 3 is a schematic cross-sectional view of a part of the inner vacuum heat insulating material provided in the hot water storage type water heater of the first embodiment. It is the figure which expanded the part shown by A in FIG.

  Hereinafter, embodiments will be described with reference to the drawings. Elements common to the drawings are denoted by the same reference numerals, and redundant description is simplified or omitted. Note that the number, arrangement, orientation, shape, and size of the devices, instruments, and components in the present invention are not limited to the number, arrangement, orientation, shape, and size shown in the drawings in principle.

Embodiment 1 FIG.
1 is a front view showing a hot water storage type hot water supply apparatus according to Embodiment 1. FIG. As shown in FIG. 1, a hot water storage type water heater 100 according to Embodiment 1 includes a hot water storage tank unit 30 having a built-in hot water storage tank 1, and heating means 4 capable of generating high temperature hot water by heating water. ing. The hot water storage tank unit 30 and the heating means 4 are connected by a water inlet pipe 3 and a hot water outlet pipe 5. The hot water storage tank unit 30 is connected to a water supply pipe 2 for supplying water from a water source such as an external water supply, a bath hot water supply pipe 6, and a hot water supply pipe 7. The water stored in the hot water storage tank 1 is led out from the lower part of the hot water storage tank 1 and is conveyed to the heating means 4 through the incoming water pipe 3. The heating means 4 is comprised with the heat pump unit which heats water using a refrigerating cycle, for example. The water conveyed to the heating means 4 is heated to become hot water. The hot water returns to the hot water storage tank unit 30 through the hot water piping 5 and flows into the hot water storage tank 1 from the upper part of the hot water storage tank 1 and is stored therein. Inside the hot water storage tank unit 30, there is provided a mixing valve for adjusting the temperature by mixing high temperature hot water taken out from the hot water storage tank 1 and water supplied from the water supply pipe 2. The hot water adjusted in temperature by the mixing valve is supplied to the bath tub 40 via the bath hot water supply pipe 6 or to a hot water supply terminal such as a shower, a kitchen, and a bathroom faucet via the hot water supply pipe 7. Supplied. The heating means in the present invention is not limited to the above-described configuration, and for example, a heating means such as an electric heater may be disposed in the hot water storage tank 1.

  The hot water storage tank unit 30 includes a substantially rectangular parallelepiped box-shaped outer case (housing) constituted by the outer case bottom plate 9, the outer case side plate 10, the outer case top plate 11, and the like. The outer case side plate 10 and the outer case top plate 11 and the outer case side plate 10 and the outer case bottom plate 9 are fastened by fastening parts such as screws. The hot water storage tank 1 is accommodated in the outer case in a state of being covered with a heat insulating material to be described later in order to suppress heat dissipation. A plurality of tank unit legs 12 are installed below the outer case, and the hot water storage tank unit 30 is supported and fixed to the ground or a pedestal by these tank unit legs 12.

  The outer case side plate 10 is provided on four surfaces of the hot water storage tank unit 30 including a front surface, a rear surface, a right side surface, and a left side surface. FIG. 1 shows a state in which the front outer case side plate 10 is removed. Various devices such as pipes, pumps, valves, heat exchangers, and control boards are arranged in the space between the outer case of the hot water tank unit 30 and the heat insulating material covering the hot water tank 1.

  In the hot water storage tank 1, a temperature stratification can be formed in which the upper side is hot and the lower side is low due to the difference in water density due to the temperature difference. When the hot water storage water heater 100 is used, a temperature distribution may be formed in the hot water storage tank 1 such as a high temperature water layer above, a low temperature water layer below, and a medium temperature water layer therebetween.

  FIG. 2 is an exploded perspective view of the hot water storage tank 1 and the heat insulating material provided in the hot water storage type hot water heater 100 of the first embodiment. FIG. 2 is a view as seen obliquely from the front. As shown in FIG. 2, the hot water storage tank 1 includes a cylindrical body 1a, an upper end panel 1b that closes the upper end of the body 1a, and a lower end panel 1c that closes the lower end of the body 1a. The trunk | drum 1a, the upper end plate 1b, and the lower end plate 1c are joined, for example by welding. The shape of the upper end plate 1b is hemispherical or bowl-shaped. The shape of the lower end plate 1c is hemispherical or bowl-shaped. The body 1 a of the hot water storage tank 1 is covered with a molded heat insulating material 13, a molded heat insulating material 14, an inner vacuum heat insulating material 15, and an outer vacuum heat insulating material 16.

  It is desirable that the molded heat insulating material 13 and the molded heat insulating material 14 are formed of foamed plastic such as foamed polystyrene. The molded heat insulating material 13 covers a half-circumferential portion of the body portion 1 a in the circumferential direction of the body portion 1 a of the hot water storage tank 1. The molded heat insulating material 13 covers the entire body portion 1 a in the vertical direction of the hot water storage tank 1. The molded heat insulating material 13 has a semi-cylindrical inner peripheral surface that is in contact with or close to the surface of the body portion 1 a of the hot water storage tank 1. With respect to the circumferential direction of the body portion 1 a of the hot water storage tank 1, the formed heat insulating material 14 covers the remaining half-circumferential portion of the body portion 1 a that is not covered with the formed heat insulating material 13. The molded heat insulating material 14 covers the lower portion of the body portion 1 a in the vertical direction of the hot water storage tank 1. The molded heat insulating material 14 has a semi-cylindrical inner peripheral surface that is in contact with or close to the surface of the body portion 1 a of the hot water storage tank 1.

  The inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16 cover the remaining half-circumferential portion of the body portion 1 a that is not covered with the molded heat insulating material 13 in the circumferential direction of the body portion 1 a of the hot water storage tank 1. The inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16 cover the upper portion of the body portion 1 a that is not covered with the molded heat insulating material 14 in the vertical direction of the hot water storage tank 1. The inner vacuum heat insulating material 15 is an example of a first vacuum heat insulating material that at least partially covers the body 1 a of the hot water storage tank 1. The inner vacuum heat insulating material 15 has a semi-cylindrical shape. The outer vacuum heat insulating material 16 is an example of a second vacuum heat insulating material arranged on the outer side in the thickness direction with respect to the inner vacuum heat insulating material 15 (first vacuum heat insulating material).

  In addition, although the heat insulating material which covers the upper end plate 1b and the lower end plate 1c of the hot water storage tank 1 may be provided, illustration is abbreviate | omitted in this Embodiment.

  FIG. 3 is a cross-sectional view of the hot water storage tank 1 and the heat insulating material provided in the hot water storage type hot water heater 100 of the first embodiment. FIG. 3 is a cross-sectional view taken along a plane perpendicular to the vertical direction of the hot water storage tank 1. FIG. 3 is a cross-sectional view at a position where the formed heat insulating material 13, the inner vacuum heat insulating material 15, and the outer vacuum heat insulating material 16 are cut and the formed heat insulating material 14 is not cut. That is, FIG. 3 is a cross-sectional view at a position above the upper surface of the molded heat insulating material 14.

  The molded heat insulating material 13 has a first side surface 13 a, a second side surface 13 b, and a third side surface 13 c that are in contact with or close to the inner wall of the outer case of the hot water storage tank unit 30. In FIG. 3, the first side surface 13a, the second side surface 13b, and the third side surface 13c are located in a U-shape. The molded heat insulating material 14 has a first side surface 14 a, a second side surface 14 b, and a third side surface 14 c that are in contact with or close to the inner wall of the outer case of the hot water storage tank unit 30. In FIG. 3, the first side surface 14a, the second side surface 14b, and the third side surface 14c are located in a U-shape.

  In the following description, the thickness of the heat insulating material means the thickness measured along the normal direction of the surface of the hot water storage tank 1 in principle. The thickness of the molded heat insulating material 13 is relatively thick at the corner portion formed by the first side surface 13a and the second side surface 13b and the corner portion formed by the second side surface 13b and the third side surface 13c. Is relatively thin. The average value obtained by averaging the thickness of the molded heat insulating material 13 along the circumferential direction of the body portion 1 a is referred to as the average thickness of the molded heat insulating material 13. The thickness of the molded heat insulating material 14 is relatively thick at the corner portion formed by the first side surface 14a and the second side surface 14b and the corner portion formed by the second side surface 14b and the third side surface 14c. Is relatively thin. The average value obtained by averaging the thickness of the molded heat insulating material 14 along the circumferential direction of the body portion 1 a is referred to as the average thickness of the molded heat insulating material 14.

  The inner peripheral surface of the inner vacuum heat insulating material 15 is in contact with or close to the surface of the body portion 1 a of the hot water storage tank 1. The inner peripheral surface of the outer vacuum heat insulating material 16 is in contact with or close to the outer peripheral surface of the inner vacuum heat insulating material 15. No other heat insulating material other than the vacuum heat insulating material is sandwiched between the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16. The outer vacuum heat insulating material 16 entirely overlaps the inner vacuum heat insulating material 15. That is, the entire or almost entire inner peripheral surface of the outer vacuum heat insulating material 16 is in contact with or close to the outer peripheral surface of the inner vacuum heat insulating material 15. There is no other heat insulating material outside the outer vacuum heat insulating material 16 in the thickness direction.

  The total thickness of the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16 is thinner than the average thickness of the molded heat insulating material 13 and thinner than the average thickness of the molded heat insulating material 14. In general, the vacuum heat insulating material has extremely excellent heat insulating performance. A vacuum heat insulating material has high heat insulation performance compared with the molded heat insulating material of the same thickness. In the present embodiment, the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16 having high heat insulating performance even if they are thin have a region that covers the hot water storage tank 1 in a double layer. An excellent heat insulating property can be obtained while suppressing the total thickness. In particular, since the outer vacuum heat insulating material 16 overlaps the inner vacuum heat insulating material 15 without interposing another heat insulating material therebetween, the total thickness of the heat insulating material in the region can be sufficiently reduced. For this reason, in the hot water storage type hot water heater 100, it is possible to make the hot water storage tank unit 30 compact while improving the heat retaining performance of the hot water storage tank 1.

  In the space between the inner wall of the outer case of the hot water storage tank unit 30 and the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16, for example, equipment such as pipes, pumps, valves, heat exchangers, control boards, etc. are arranged. Also good. By doing so, the space in the outer case of the hot water storage tank unit 30 can be used more effectively, which is advantageous for making the hot water storage tank unit 30 compact.

  In this Embodiment, the length of the inner side vacuum heat insulating material 15 about the circumferential direction of the trunk | drum 1a of the hot water storage tank 1 is longer than the length of the outer side vacuum heat insulating material 16 about the circumferential direction of the trunk | drum 1a. Thereby, if it is this Embodiment, the following effects will be acquired. The position of the seam 17 between the inner vacuum heat insulating material 15 and the molded heat insulating material 13 and the position of the seam 18 between the outer vacuum heat insulating material 16 and the molded heat insulating material 13 can be prevented from overlapping. If the position of the seam 17 and the position of the seam 18 overlap, heat leaks easily from that position. On the other hand, since the position of the seam 17 and the position of the seam 18 do not overlap, the heat leakage can be suppressed.

  The molded heat insulating material 13 has an overlapping portion 13 d that overlaps the outer side in the thickness direction with respect to the inner vacuum heat insulating material 15 at a portion close to the joint 17 with the inner vacuum heat insulating material 15. That is, the inner vacuum heat insulating material 15 has a portion sandwiched between the overlapping portion 13 d of the formed heat insulating material 13 and the body portion 1 a of the hot water storage tank 1. Thereby, if it is this Embodiment, the following effects will be acquired. Since the overlapping portion 13d exists outside the seam 17, heat leakage from the seam 17 can be reliably suppressed.

  The joint 18 is formed by joining the end surface of the outer vacuum heat insulating material 16 to the end surface of the overlapping portion 13d of the molded heat insulating material 13. The outer vacuum heat insulating material 16 does not have a portion sandwiched between the molded heat insulating material 13 and the body portion 1 a of the hot water storage tank 1. That is, the molded heat insulating material 13 does not have a portion overlapping the outer side in the thickness direction with respect to the outer vacuum heat insulating material 16. Thereby, if it is this Embodiment, the following effects will be acquired. Since it can suppress that the part where the thickness of the whole heat insulating material becomes thick in the area | region where the outer side vacuum heat insulating material 16 is arrange | positioned arises, it becomes advantageous to the miniaturization of the hot water storage tank unit 30.

  FIG. 4 is a cross-sectional view of the hot water storage tank 1 and the heat insulating material provided in the hot water storage type water heater 100 of the first embodiment. FIG. 4 is a view as seen from diagonally behind. In FIG. 4, the molded heat insulating material 14 is omitted. As shown in FIG. 4, the present embodiment is configured as follows. The length of the outer vacuum heat insulating material 16 in the vertical direction of the hot water storage tank 1 is shorter than the length of the inner vacuum heat insulating material 15 in the vertical direction. The center position of the outer vacuum heat insulating material 16 in the vertical direction is higher than the center position of the inner vacuum heat insulating material 15 in the vertical direction. The water temperature in the hot water storage tank 1 is higher on the upper side. The upper part of the body portion 1 a of the hot water storage tank 1 is double covered with the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16. There is a high possibility that high-temperature water exists in the upper portion. Since the upper part is covered with the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16 in a double manner, the temperature drop of the high temperature water can be more reliably suppressed. Of the body portion 1 a of the hot water storage tank 1, an intermediate portion in the height direction is covered only with the inner vacuum heat insulating material 15. In the middle part, there is a high possibility that medium temperature water exists. For this reason, the temperature fall of intermediate temperature water can be reliably suppressed only by the inner vacuum heat insulating material 15.

  FIG. 5 is a schematic cross-sectional view of a part of the inner vacuum heat insulating material 15 provided in the hot water storage type hot water heater 100 of the first embodiment. As shown in FIG. 5, the inner vacuum heat insulating material 15 includes a core material 15a, an outer skin material 15b, and a hygroscopic material 15c. The core material 15a is a porous plate-shaped core material made of, for example, foam, powder, fiber, or the like. The outer skin material 15b covers the core material 15a from both sides. The skin material 15b is made of, for example, a plastic film, a plastic metal laminate film, or the like, and has a gas barrier property. The outer skin material 15b on both surfaces of the core material 15a is sealed by being bonded to the outer peripheral portion of the core material 15a by an adhesive or heat welding. The inner vacuum heat insulating material 15 has extremely high heat insulating performance because the inside of the outer skin material 15b sealed in a bag shape is in a reduced pressure state close to vacuum.

  In the inner vacuum heat insulating material 15 in FIG. 5, the lower surface is a surface facing the hot water storage tank 1, and the upper surface is a surface not facing the hot water storage tank 1. The hygroscopic material 15 c is disposed between the core material 15 a and the outer skin material 15 b that does not face the hot water storage tank 1. The hygroscopic material 15c adsorbs moisture in the internal space surrounded by the outer skin material 15b. Since the moisture absorbent 15c adsorbs moisture, an increase in internal pressure due to moisture can be prevented from degrading the heat insulation performance of the inner vacuum heat insulating material 15. The hygroscopic material 15c may include, for example, activated carbon, zeolite, calcium chloride, calcium oxide, magnesium oxide, magnesium chloride, calcium hydroxide, magnesium hydroxide, silica gel, and the like. At the place where the moisture absorbent material 15c is installed, the surface of the outer skin material 15b has a convex shape due to the thickness of the moisture absorbent material 15c.

  As shown in FIG. 4, the inner vacuum heat insulating material 15 has a region that is not covered by the outer vacuum heat insulating material 16. The hygroscopic material 15c is located in the region. Thereby, the following effects are acquired. The convex shape of the surface of the outer skin material 15b by the hygroscopic material 15c does not cause a gap between the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16. Since it can suppress reliably that a clearance gap arises between the inner side vacuum heat insulating material 15 and the outer side vacuum heat insulating material 16, the heat insulation fall by the said clearance gap can be suppressed reliably.

  Since the cross-sectional view of the outer vacuum heat insulating material 16 is the same as the cross-sectional view of the inner vacuum heat insulating material 15 (FIG. 5), the description thereof is omitted. The outer vacuum heat insulating material 16 includes a core material and a skin material. The outer vacuum heat insulating material 16 may include a hygroscopic material. The hygroscopic material of the outer vacuum heat insulating material 16 may be disposed between the outer skin material and the core material on the surface not facing the inner vacuum heat insulating material 15. By arranging the hygroscopic material in such a manner, it is possible to reliably suppress the occurrence of a gap between the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16.

  In general, when the outer skin material is damaged, the heat insulating performance of the vacuum heat insulating material is deteriorated due to air entering the inside. For this reason, it is extremely important to suppress damage to the outer skin material of the vacuum heat insulating material. The outer skin material of the outer vacuum heat insulating material 16 may have a material different from the material of the outer skin material 15 b of the inner vacuum heat insulating material 15. By making the material of the outer cover material 15b of the inner vacuum heat insulating material 15 different from the material of the outer cover material of the outer vacuum heat insulating material 16, it is more suitable for each of the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16. It is possible to use an outer skin material. For example, the following may be used.

  It is desirable that the tear strength of the outer skin material of the outer vacuum heat insulating material 16 is higher than the tear strength of the outer skin material 15 b of the inner vacuum heat insulating material 15. The outer vacuum heat insulating material 16 may come into contact with something at the time of manufacturing and assembling the hot water tank unit 30 or during maintenance. By using a material having a relatively high tear strength as the outer skin material of the outer vacuum heat insulating material 16, it is possible to reliably suppress damage to the outer skin material when the outer skin material of the outer vacuum heat insulating material 16 comes into contact with something. Since the inner vacuum heat insulating material 15 has a region covered with the outer vacuum heat insulating material 16, there is a low possibility that the inner vacuum heat insulating material 15 will come into contact with something at the time of manufacturing and assembly of the hot water storage tank unit 30 or during maintenance. For this reason, the tear strength of the outer skin material 15b of the inner vacuum heat insulating material 15 may be relatively low.

  The heat resistance temperature of the outer skin material 15 b of the inner vacuum heat insulating material 15 is preferably higher than the heat resistance temperature of the outer skin material of the outer vacuum heat insulating material 16. The outer skin material 15b of the inner vacuum heat insulating material 15 is likely to receive the heat of high temperature water stored in the hot water storage tank 1, that is, hot water. The outer skin material 15b of the inner vacuum heat insulating material 15 is required to be made of a material having a heat resistant temperature equal to or higher than the maximum temperature of the hot water stored in the hot water storage tank 1. On the other hand, since the inner vacuum heat insulating material 15 exists between the hot water storage tank 1 and the outer vacuum heat insulating material 16, the heat resistance temperature of the outer vacuum heat insulating material 16 is the outer heat insulating material 15 b of the inner vacuum heat insulating material 15. It may be lower than the heat resistant temperature.

  6 is an enlarged view of a portion indicated by A in FIG. As shown in FIG. 6, the thickness L <b> 1 of the inner vacuum heat insulating material 15 is thinner than the thickness L <b> 2 of the outer vacuum heat insulating material 16. With such a configuration, the following effects can be obtained. When the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16 are attached to the hot water storage tank 1, an R-shaped process may be performed in accordance with the curvature radius after the attachment. The radius of curvature of the inner vacuum heat insulating material 15 after attachment is smaller than the radius of curvature of the outer vacuum heat insulating material 16 after attachment. By reducing the thickness L1 of the inner vacuum heat insulating material 15 having a relatively small radius of curvature, it becomes possible to easily process the R shape of the inner vacuum heat insulating material 15.

  In the present embodiment, the configuration in which the inner vacuum heat insulating material 15 partially covers the trunk portion 1a of the hot water storage tank 1 has been described. The inner vacuum heat insulating material 15 may cover the trunk portion 1a of the hot water storage tank 1 over the entire circumference. The inner vacuum heat insulating material 15 desirably covers at least a half circumference of the trunk portion 1a in the circumferential direction of the trunk portion 1a of the hot water storage tank 1. In the present invention, a vacuum heat insulating material that further overlaps the inner vacuum heat insulating material 15 and the outer vacuum heat insulating material 16 may be provided. That is, there may be a portion where the vacuum heat insulating material overlaps more than triple.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank, 1a Body part, 1b Upper end plate, 1c Lower end plate, 2 Water supply piping, 3 Water supply piping, 4 Heating means, 5 Hot water supply piping, 6 Bath hot water supply piping, 7 Hot water supply piping, 9 Outer case bottom plate, 10 Outer case side plate 11 Outer case top plate, 12 Tank unit leg, 13 Molded heat insulating material, 13a First side surface, 13b Second side surface, 13c Third side surface, 13d Overlapping part, 14 Molded heat insulating material, 14a First side surface, 14b Second side surface , 14c 3rd side, 15 Inner vacuum heat insulating material, 15a Core material, 15b Outer skin material, 15c Hygroscopic material, 16 Outer vacuum heat insulating material, 17, 18 Seam, 30 Hot water storage tank unit, 40 Bathtub, 100 Hot water storage type water heater

Claims (9)

A hot water storage tank having a trunk,
A first vacuum insulation that at least partially covers the barrel;
The second vacuum insulating material is disposed on the outer side in the thickness direction with respect to the first vacuum heat insulating material, and overlaps the first vacuum heat insulating material entirely without interposing another heat insulating material between the first vacuum heat insulating material. Vacuum insulation,
Hot water storage type water heater equipped with.   The hot water storage type hot water heater according to claim 1, wherein the outer vacuum material of the second vacuum heat insulating material has a material different from that of the outer vacuum material of the first vacuum heat insulating material.   The hot water storage type water heater according to claim 1 or 2, wherein a tear strength of the outer skin material of the second vacuum heat insulating material is higher than a tear strength of the outer skin material of the first vacuum heat insulating material.   The hot water storage type hot water supply device according to any one of claims 1 to 3, wherein a heat resistant temperature of the outer skin material of the first vacuum heat insulating material is higher than a heat resistant temperature of the outer skin material of the second vacuum heat insulating material.   The hot water storage according to any one of claims 1 to 4, wherein a length of the first vacuum heat insulating material in the circumferential direction of the body portion is longer than a length of the second vacuum heat insulating material in the circumferential direction. Type water heater. The first vacuum heat insulating material partially covers the body part in the circumferential direction of the body part,
A molded heat insulating material that covers the body portion of the circumferential direction in which the first vacuum heat insulating material does not cover,
The first vacuum heat insulating material has a portion sandwiched between the hot water storage tank and the molded heat insulating material,
The hot water storage type hot water supply apparatus according to any one of claims 1 to 5, wherein the second vacuum heat insulating material does not have a portion sandwiched between the hot water storage tank and the molded heat insulating material. The length of the second vacuum heat insulating material in the vertical direction of the hot water storage tank is shorter than the length of the first vacuum heat insulating material in the vertical direction,
7. The center position of the second vacuum heat insulating material in the up-down direction is above the center position of the first vacuum heat insulating material in the up-down direction. Hot water storage water heater. The first vacuum heat insulating material includes a hygroscopic material disposed between a core material and an outer skin material that does not face the hot water storage tank,
The hot water storage system according to any one of claims 1 to 7, wherein the first vacuum heat insulating material has a region not covered with the second vacuum heat insulating material, and the hygroscopic material is located in the region. Water heater.   The hot water storage type hot water supply apparatus according to any one of claims 1 to 8, wherein a thickness of the first vacuum heat insulating material is thinner than a thickness of the second vacuum heat insulating material.

Images