JP2013024464A - Storage type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage type water heater capable of preventing damage of a vacuum heat insulating material and slow leakage and suppressing deterioration in heat retaining function of the vacuum heat insulating material caused by secular change in a welded film part of the vacuum heat insulating material.SOLUTION: The storage type water heater includes: a hot water storage tank 2 having a substantially cylindrical shape for storing hot water; and at least one of vacuum heat insulating materials 5a, 5b provided covering the hot water storage tank 2. Each of the vacuum heat insulating materials 5a, 5b has a core material and the welded film part 6 which extends outward without being bent from an edge of the core material. A gap 8a is provided between a pair of the edges disposed opposing each other. The extended welded film parts 6 extending from each of both edges are at least partially overlapped with each other in the gap 8a.

Description

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

  There are a wide range of hot water storage water heaters configured to store hot water obtained by heating water with a heat source such as a heat pump unit in a hot water storage tank, take out hot water from this hot water storage tank when necessary, and supply it to a hot water supply terminal It is used. In order to suppress heat dissipation loss from the hot water storage tank, a heat insulating material is disposed around the hot water storage tank. Conventionally, foamed polystyrene or the like is generally used as the heat insulating material, but in order to further improve the heat insulation performance of the hot water storage tank, a technique using a vacuum heat insulating material with higher heat insulating performance has been proposed (for example, Patent Documents). 1-3). The vacuum insulation material is a core material (core material) obtained by processing foam, powder, fiber, etc. into a sheet, wrapped in a gas barrier film (plastic film, plastic metal laminate film, etc.), and the inside is evacuated, The gas barrier film has a configuration in which the peripheral portion of the gas barrier film is thermally welded and sealed. For this reason, in the vacuum heat insulating material, a portion where the gas barrier film is thermally welded (hereinafter referred to as “welded film portion”) projects outward from the edge portion of the core material.

JP 2010-84967 A JP 2007-212059 A JP 2007-155085 A

  In the invention described in Patent Document 1, in a place where two vacuum heat insulating materials are adjacent to each other, the welding film portion of the vacuum heat insulating material is folded back to the main body side (core material side) and fixed with a double-sided tape or the like. Another insulation is attached to the gap. In the case of this configuration, there is a problem that the working time is increased because a process of folding and fixing the welding film portion to the core material side is added. Moreover, when a welding film part is bent, a hole is opened, and there is a possibility that the vacuum heat insulating material is damaged or a slow leak is generated.

  In the invention described in Patent Document 2, two adjacent vacuum heat insulating materials are arranged so that the front and back are alternately arranged, and the welding film portions are arranged so as to overlap each other on the core material of the other vacuum heat insulating material. . In the case of this configuration, one welding film portion is inserted between the core material of the other vacuum heat insulating material and the hot water storage tank, so that it is in close contact with the surface of the hot water storage tank. For this reason, with the passage of time, there is a problem that the welded film portion is thermally deteriorated due to the high temperature of the hot water storage tank, the sealing performance is lowered, and the heat insulation performance of the vacuum heat insulating material is lowered.

  Further, Patent Document 3 discloses a non-core material portion consisting only of a gas barrier film between adjacent core materials by wrapping a plurality of core materials arranged at predetermined intervals with a gas barrier film. An invention of a vacuum heat insulating material having a (welded film portion), in which a space between a core material and a core material is narrowed and a non-core material portion is bent is disclosed. Also in this structure, when a non-core material part is bent, a hole is opened, and there is a possibility that the vacuum heat insulating material is broken or a slow leak is generated.

  The present invention has been made in order to solve the above-described problems, and can prevent damage to the vacuum heat insulating material and slow leak, and can also prevent vacuum heat insulating material due to aging of the welded film portion of the vacuum heat insulating material. It aims at providing the hot water storage type water heater which can suppress the heat retention performance fall of this.

  A hot water storage type water heater according to the present invention includes a substantially cylindrical hot water storage tank for storing hot water, and at least one vacuum heat insulating material provided to cover the hot water storage tank, the vacuum heat insulating material, a core material, A welded film portion that protrudes outward without being bent from the edge portion of the core material, and a gap is provided between a pair of facing edge portions that are opposed to each other, and each of the welded portions projects from both edge portions. The film portions overlap each other at least partially in the gap.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress the heat retention performance fall of the vacuum heat insulating material by the secular change of the welding film part of a vacuum heat insulating material. Moreover, since the welding film part is not bent, damage to the vacuum heat insulating material and slow leak can be reliably prevented.

It is a block diagram which shows the hot water storage type water heater of Embodiment 1 of this invention. It is AA sectional drawing (longitudinal sectional view) in FIG. It is sectional drawing which expands and shows a part of FIG. It is BB sectional drawing (transverse sectional view) in FIG. It is sectional drawing (transverse sectional view) which cut | disconnected the hot water storage tank unit 1 with which the hot water storage type water heater of Embodiment 2 of this invention is provided in the position equivalent to the BB line in FIG. It is sectional drawing (transverse sectional view) which cut | disconnected the hot water storage tank unit 1 with which the hot water storage type water heater of Embodiment 3 of this invention is provided in the position corresponded to the BB line in FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing an appearance of a hot water storage tank unit provided in the hot water storage type hot water supply apparatus according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view (vertical cross-sectional view) taken along the line AA in FIG. FIG. 3 is an enlarged cross-sectional view of a part of FIG. 4 is a cross-sectional view (cross-sectional view) taken along the line BB in FIG.

  A hot water storage tank unit 1 shown in these drawings is disposed between a substantially cylindrical hot water storage tank 2, a substantially rectangular parallelepiped box-shaped outer case 10 that accommodates the hot water storage tank 2, and the hot water storage tank 2 and the outer case 10. Heat insulating materials (outer peripheral heat insulating material 3, vacuum heat insulating materials 5a and 5b, upper heat insulating material 11 and lower heat insulating material 12). As shown in FIG. 1, the outer case 10 is fixed to the ground or a pedestal via a plurality of legs 13 provided at the bottom thereof.

  Inside the hot water storage tank 2, hot water heated by a heat source can be stored from the upper side, and low temperature water supplied from a water source such as a water supply can be stored from the lower side, and is always maintained in a full water state. The upper layer hot water and the lower layer water are maintained without mixing due to the difference in specific gravity.

  The hot water storage type hot water heater includes a heat source such as a heat pump unit installed outside the hot water storage tank unit 1 or an electric heater installed in the hot water storage tank 2. Omitted. Further, in the hot water storage tank unit 1, a water supply pipe for supplying water into the hot water storage tank 2, a hot water supply pipe for extracting hot water from the hot water storage tank 2, a mixing valve for mixing water and hot water and supplying hot water at a predetermined temperature, Although a water circulation pump and the like are provided, illustration and detailed description thereof are also omitted.

  As shown in FIG. 2, the outer peripheral surface of the body (cylindrical portion) of the hot water storage tank 2 is formed by a vacuum heat insulating material 5a (first vacuum heat insulating material) and a vacuum heat insulating material 5b (second vacuum heat insulating material). Covered. With respect to the vertical direction (vertical direction), the vacuum heat insulating material 5a is located on the upper side, and the vacuum heat insulating material 5b is located on the lower side of the vacuum heat insulating material 5a.

  The body portion of the hot water storage tank 2 is further covered with an outer peripheral heat insulating material 3 from the outside of the vacuum heat insulating materials 5a and 5b. The outer peripheral heat insulating material 3 covers the body of the hot water storage tank 2 over the entire circumference. The outer peripheral heat insulating material 3 is made of a heat insulating material other than the vacuum heat insulating material, and for example, a foamable heat insulating material such as foamed polystyrene or a fiber heat insulating material such as glass wool can be used. When the outer peripheral heat insulating material 3 is formed of a molded heat insulating material, the outer peripheral heat insulating material 3 may be divided into a plurality of members (for example, two members having a semicylindrical shape). You may be comprised with one member.

  The upper heat insulating material 11 covers the upper surface portion of the hot water storage tank 2. The lower heat insulating material 12 covers the bottom surface of the hot water storage tank 2. As the upper heat insulating material 11 and the lower heat insulating material 12, for example, a foamable heat insulating material such as foamed polystyrene or a fiber heat insulating material such as glass wool can be used.

  As shown in FIG. 3, each of the vacuum heat insulating materials 5a and 5b has a core material (core material) 7 formed by processing foam, powder, fiber, or the like into a sheet shape. The material 7 is wrapped with a gas barrier film (plastic film, plastic metal laminate film, etc.) which is an outer cover material, the inside is made into a vacuum state, and the periphery of the gas barrier film is sealed by heat welding or the like. In the vacuum heat insulating materials 5 a and 5 b, the welding film portion 6, which is a portion where the gas barrier film is hermetically welded, projects outward from the edge portion of the core material 7. Although the edge part of the lower end of the core material 7 of the vacuum heat insulating material 5a and the edge part of the upper end of the core material 7 of the vacuum heat insulating material 5b are arranged to face each other, a gap 8a is provided between them. ing. The gap 8 a extends in the horizontal direction along the circumferential direction of the hot water storage tank 2. The welded film portion 6 of the vacuum heat insulating materials 5a and 5b projects outward from the edge portion of the core material 7 without being bent. And the welding film part 6 of the vacuum heat insulating material 5a and the welding film part 6 of the vacuum heat insulating material 5b have mutually overlapped in the space of the clearance gap 8a.

  Thus, in this embodiment, the welding film part 6 of the vacuum heat insulating materials 5a and 5b is not bent, or the welding film part 6 is not folded back and fixed to the core material 7 side, and is welded from the edge part of the core material 7. The film part 6 is projected outside as it is. For this reason, since the bending process of the welding film part 6 is unnecessary, the increase in working time can be avoided. In addition, since the gas barrier film does not have a hole when the welding film portion 6 is bent, it is possible to reliably prevent the vacuum heat insulating materials 5a and 5b from being damaged or causing a slow leak. .

  Moreover, in this embodiment, since the welding film part 6 is not inserted between the core material 7 and the hot water storage tank 2, and the welding film part 6 is located in the space 8a, the welding film part 6 is hot water storage. There is no close contact with the surface of the tank 2. For this reason, since the welding film part 6 is not directly exposed to the high temperature of the hot water storage tank 2, the temperature of the welding film part 6 is about 10 ° C. to 20 ° C. lower than the temperature of the core material 7. Thereby, since the fall of the sealing performance by the heat deterioration of the welding film part 6 can be prevented reliably, the fall of the heat insulation performance of the vacuum heat insulating materials 5a and 5b by aged can be suppressed reliably.

  In addition, the welding film part 6 of the vacuum heat insulating material 5a and the welding film part 6 of the vacuum heat insulating material 5b should just overlap mutually at least in the clearance gap 8a. If the gap 8a is large enough for the welded film portions 6 of the two vacuum heat insulating materials 5a and 5b to overlap each other, the heat dissipation loss from the gap 8a is small, so that the decrease in the heat retention performance of the hot water storage tank 2 is sufficiently suppressed. be able to.

  In addition, the size L of the gap 8a is desirably equal to or greater than the overhanging length of the welding film portion 6 (the length from the end surface of the core material 7 to the tip of the welding film portion 6). Thereby, it can prevent more reliably that the welding film part 6 is inserted between the core material 7 and the hot water storage tank 2. FIG. In addition, the overhang length of the welding film part 6 shall be about 10-20 mm, for example.

  As shown in FIG. 2, in this embodiment, the body part of the hot water storage tank 2 is divided into two parts, a vacuum heat insulating material 5a and a vacuum heat insulating material 5b, in the vertical direction. The gap 8a with the vacuum heat insulating material 5b is located below a height that is ½ of the total height of the hot water storage tank 2. In the hot water storage tank 2, hot water is stored on the upper side and low temperature water is stored on the lower side due to the specific gravity difference of the hot water. For this reason, the temperature of the hot water storage tank 2 tends to be higher as it is closer to the upper part and lower as it is closer to the lower part. Therefore, the lower the position of the gap 8a, the smaller the amount of heat released from the gap 8a. In the present embodiment, the heat loss from the gap 8a can be made sufficiently small by arranging the position of the gap 8a below the half of the total height of the hot water tank 2, and the inside of the hot water tank 2 Convection of hot and cold water can be suppressed. For this reason, the heat retention performance of the hot water storage tank 2 can be improved.

  As shown in FIG. 4, one vacuum heat insulating material 5a is sized to cover a part of the circumferential direction (1/3 circumference) of the hot water storage tank 2, and three vacuum heat insulating materials 5a are arranged. Thus, the body of the hot water storage tank 2 is covered over the entire circumference. These three vacuum heat insulating materials 5a are disposed with a gap 8b provided between the core materials 7. The gap 8b extends in the vertical direction (vertical direction). The welded film portions 6 projecting from the edge portions of the core material 7 of the pair of vacuum heat insulating materials 5a facing each other through the gap 8 are not folded and overlap each other at least partially in the gap 8b. With such a configuration, the same effect as that obtained by the gap 8a can be obtained. That is, since the bending process of the welding film part 6 is unnecessary, the increase in working time can be avoided. Moreover, since no hole is opened in the gas barrier film when the welded film portion 6 is bent, it is possible to reliably prevent the vacuum heat insulating material 5a from being damaged or causing a slow leak. Moreover, since it can avoid that the welding film part 6 closely_contact | adheres to the hot water storage tank 2, the thermal deterioration of the welding film part 6 can be prevented reliably.

  In the present embodiment, the gaps 8 b provided between the core members 7 of the three vacuum heat insulating materials 5 a are arranged at equal angular intervals (120 ° intervals) with respect to the center of the hot water storage tank 2. With such a configuration, the influence of heat dissipation from the gap 8b can be uniformly distributed in the circumferential direction of the hot water storage tank 2, and thus the influence of heat dissipation from the gap 8b can be sufficiently suppressed.

  However, in this invention, you may comprise so that the perimeter of the trunk | drum of the hot water storage tank 2 may be covered not only with the above structures but with one vacuum heat insulating material. In that case, a gap is formed between both edge portions in a portion where the edge portions at both ends of the core member 7 face each other by one vacuum heat insulating material going around the body portion of the hot water storage tank 2. What is necessary is just to comprise so that the welding film part 6 overhang | projected from each may overlap each other in at least one part in the said clearance gap.

  In the above-described embodiment, the configuration in which only one layer of the vacuum heat insulating materials 5a and 5b is provided has been described. However, in the present invention, a plurality of layers of vacuum heat insulating materials may be provided. Moreover, in embodiment mentioned above, although arrangement | positioning of the vacuum heat insulating material 5a about the circumferential direction of the hot water storage tank 2 was demonstrated, arrangement | positioning of the vacuum heat insulating material 5b about the circumferential direction of the hot water storage tank 2 is also the same as the vacuum heat insulating material 5a. Is desirable.

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 5. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  FIG. 5 is a cross-sectional view (transverse cross-sectional view) of the hot water storage tank unit 1 provided in the hot-water storage type water heater of Embodiment 2 of the present invention cut at a position corresponding to the line BB in FIG. As shown in FIG. 5, in this embodiment, one vacuum heat insulating material 5 a is sized to cover half of the circumferential direction (1/2 turn) of the hot water tank 2, and this vacuum heat insulating material 5 a By arranging two, the trunk of the hot water storage tank 2 is covered over the entire circumference. The gap 8b provided between the cores 7 of the two vacuum heat insulating materials 5a is arranged at equiangular intervals (180 ° intervals) with respect to the center of the hot water storage tank 2. With such a configuration, the influence of heat dissipation from the gap 8b can be uniformly distributed in the circumferential direction of the hot water storage tank 2, and thus the influence of heat dissipation from the gap 8b can be sufficiently suppressed.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 6. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted.

  6 is a cross-sectional view (transverse cross-sectional view) obtained by cutting hot water storage tank unit 1 included in the hot-water storage type water heater according to Embodiment 3 of the present invention at a position corresponding to the line BB in FIG. As shown in FIG. 6, in the present embodiment, one vacuum heat insulating material 5 a is sized to cover a part of the hot water storage tank 2 in the circumferential direction (about ¼ turn). By arranging four 5a, the trunk of the hot water storage tank 2 is covered over the entire circumference. A gap 8b is provided between the cores 7 of the four vacuum heat insulating materials 5a.

  Moreover, in this embodiment, the outer peripheral heat insulating material 3 is not uniform in thickness, and has a thick region and a thin region in the circumferential direction of the hot water storage tank 2. That is, on the straight line C from the center of the hot water storage tank 2 to the corner of the outer case 10, the outer peripheral heat insulating material 3 is the thickest, and on the vertical line that is lowered from the center of the hot water storage tank 2 to the inner wall surface of the outer case 10. In FIG. 3, the thickness of the outer peripheral heat insulating material 3 is the thinnest. The thicker the outer peripheral heat insulating material 3 is, the larger the thermal resistance of the outer peripheral heat insulating material 3 is. For this reason, the thermal resistance is relatively large (compared to the average value) in the region where the outer peripheral heat insulating material 3 is thicker than the average thickness, and the heat resistance is higher in the region where the outer peripheral heat insulating material 3 is thinner than the average thickness. The resistance is relatively small (compared to the average value).

  Thus, when the area | region where the thermal resistance of the outer peripheral part heat insulating material 3 is relatively large, and the area | region where a relatively small thermal resistance exists, the clearance gap 8b is arrange | positioned in the area | region where the thermal resistance of the outer peripheral part heat insulating material 3 is relatively large. It is desirable. This is because by disposing the gap 8b in a region where the thermal resistance of the outer peripheral heat insulating material 3 is relatively large, heat dissipation from the gap 8b can be reliably suppressed by the heat insulating property of the outer peripheral heat insulating material 3. According to such an arrangement, the heat radiation loss from the hot water storage tank 2 can be sufficiently reduced.

  In particular, in the present embodiment, the gap 8b is arranged at a location where the thermal resistance of the outer peripheral heat insulating material 3 is maximum (on the straight line C from the center of the hot water storage tank 2 to the corner of the outer case 10). For this reason, the heat insulation of the outer peripheral heat insulating material 3 can more reliably suppress the heat radiation from the gap 8b, and the heat radiation loss from the hot water storage tank 2 can be further reduced.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit 2 Hot water storage tank 3 Outer peripheral heat insulating material 5a, 5b Vacuum heat insulating material 6 Welding film part 7 Core material 8a, 8b Gap 10 Outer case 11 Upper heat insulating material 12 Lower heat insulating material 13 Leg

Claims (5)

A substantially cylindrical hot water storage tank for storing hot water;
At least one vacuum insulation provided over the hot water storage tank;
With
The vacuum heat insulating material has a core material, and a welded film portion that protrudes outside without being bent from an edge portion of the core material,
A hot water storage type hot water supply apparatus in which a gap is provided between a pair of the edge portions arranged to face each other, and the welding film portions projecting from the both edge portions overlap each other at least partially in the gap. The body part of the hot water storage tank is divided and covered with a first vacuum heat insulating material and a second vacuum heat insulating material located below the first vacuum heat insulating material in the vertical direction,
The gap provided between the core material of the first vacuum heat insulating material and the core material of the second vacuum heat insulating material is located below a height of ½ of the total height of the hot water storage tank. The hot water storage type water heater according to claim 1. The hot water storage tank is covered over the entire circumference by arranging a plurality of vacuum heat insulating materials covering a part in the circumferential direction of the hot water storage tank,
An outer peripheral heat insulating material covering the hot water storage tank from the outside of the plurality of vacuum heat insulating materials,
The outer peripheral heat insulating material has a region having a large thermal resistance and a region having a small thermal resistance in the circumferential direction of the hot water storage tank,
3. The hot water storage type hot water heater according to claim 1, wherein the gap provided between the cores of the plurality of vacuum heat insulating materials is located in a region where the thermal resistance is large. The hot water storage tank is covered over the entire circumference by arranging a plurality of vacuum heat insulating materials covering a part in the circumferential direction of the hot water storage tank,
3. The hot water storage type hot water heater according to claim 1, wherein the gaps provided between the cores of the plurality of vacuum heat insulating materials are located at equiangular intervals with respect to the center of the hot water storage tank.   The hot water storage type hot water heater according to any one of claims 1 to 4, wherein a size of the gap is equal to or longer than a length of the overhang of the welding film portion.

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