JP6840009B2 - Effervescent insulation and hot water storage type water heater - Google Patents

Description

The present invention relates to a hot water storage type water heater having a foamed heat insulating material that covers a heat insulating object to prevent heat dissipation and a hot water storage tank covered with the foamed heat insulating material.

Conventionally, in the foamed heat insulating material provided in this type of hot water storage type water heater, as shown in FIGS. 6 and 7 of Patent Document 1 and paragraph 0039 of the specification, the type of the foamed heat insulating material is changed up and down. It has been suggested that the above is integrally molded by performing two-color molding (Patent Document 1).

Explaining the hot water storage tank provided with such a foam heat insulating material based on the cross-sectional view shown in FIG. 5, the hot water storage tank 101 is made of a material having high material strength and a foam heat insulating material 102 having a low foaming ratio. An inexpensive foamed heat insulating material 103, which is a material having a relatively low material strength and a high foaming ratio, is used in the lower part of the tank 101, and these are integrally molded by two-color molding.

The foamed heat insulating material is made of, for example, heat-resistant foamed polyestertyrene. Raw material beads made of polystyrene resin and a hydrocarbon-based foaming agent are pre-foamed, filled in a mold, and heated to be about 30 to 80 times. It is molded by foaming it twice and fusing the beads together, and then cooling the mold and then taking out the molded product.

Next, the manufacturing method of FIG. 5 will be described in detail with reference to FIG.
When trying to manufacture an integrally molded foam heat insulating material in the shape of a mold 104 with a foam heat insulating material 102 having a low foaming ratio and a foam heat insulating material 103 having a high foaming ratio, first, the foamed heat insulating material 102 having a low foaming ratio and foaming A partition plate 105 is inserted at a place serving as a boundary line of the foamed heat insulating material 103 having a high magnification so that beads of foamed polyester styrene having different foaming magnifications do not mix with each other. At this time, since the partition plate 105 needs to be taken out at the time of foaming, it needs to have a straight shape.

Then, the upper injection port 106 for injecting the pre-foamed foamed polyestertyrene beads of the foamed heat insulating material 102 having a low foaming ratio and the pre-foamed foamed polyesterstyrene beads of the foamed heat insulating material 103 having a high foaming ratio are injected. Foamed polystyrene beads are injected from the lower injection port 107 while adjusting the filling pressure and filling timing.

Then, after injecting a required amount of foamed polyester styrene beads from the upper injection port 106 and the lower injection port 107, the partition plate 105 is pulled out and heated to foam the foamed polyester styrene to fuse and integrally mold. Then, after the mold 104 is cooled, the molded product can be taken out to manufacture a foamed heat insulating material in which heat insulating materials having different foaming ratios are integrally molded.

Japanese Unexamined Patent Publication No. 2011-237072

However, if the foam insulation material is integrally molded with different foam magnifications and materials on the top and bottom, cracks are likely to occur at the boundary lines with different foam magnifications due to differences in material characteristics such as heat transfer. In the case of a straight line, as shown in FIG. 5C, there is a problem that the hot water storage tank 101 is exposed due to the cracking, heat leaks from the cracked gap, and the heat insulating performance is deteriorated. ..

In order to solve the above problems, the present invention is a foamed heat insulating material that prevents heat dissipation from a heat insulating object, and the foamed heat insulating material includes two types of heat insulating materials having different foaming ratios or two types of heat insulating materials having different materials. It is integrally molded by color molding, and the boundary line between these two different types of heat insulating materials is formed into a stepped shape, and the boundary line of the stepped shape is formed by fusing the two different types of heat insulating materials. Is.

Further, the foamed heat insulating material has a substantially thin plate shape, the boundary line is formed along the thickness direction of the foamed heat insulating material, and the boundary line is formed at a position different between one surface and the other surface of the substantially thin plate shape. By being formed, a stepped boundary line was formed.

Further, a hot water storage type water heater having a hot water storage tank covered with the foamed heat insulating material according to claim 2, wherein the type of the heat insulating material is different between the upper part and the lower part of the hot water storage tank, and the water heater is located at the upper part. The heat insulating performance of one type of heat insulating material is higher than that of the other type of heat insulating material located at the bottom, and the boundary line is provided in a substantially horizontal direction and is located inside the foamed heat insulating material. The boundary line has a stepped shape so as to be different from the height position of the boundary line.

According to the present invention, even if a crack occurs at the boundary line between different types of heat insulating materials and a gap is generated, the boundary line has a stepped shape, so that the heat insulating object is exposed. It is possible to prevent the heat insulation performance from being deteriorated and wasteful energy consumption.

Schematic configuration diagram of the hot water storage type water heater of the first embodiment of the present invention An exploded configuration diagram of the foamed heat insulating material and the hot water storage tank according to the first embodiment of the present invention. An exploded sectional view of the foamed heat insulating material and the hot water storage tank according to the first embodiment of the present invention. Explanatory drawing which shows the manufacturing process of the foam insulation material of 1st Embodiment of this invention. Disassembled sectional view of conventional foam insulation and hot water storage tank Explanatory drawing showing the manufacturing process of the conventional foam insulation material

Next, the first embodiment of the present invention will be described with reference to the schematic diagram of FIG.
Reference numeral 1 denotes a hot water storage tank for storing hot water as a heat insulating object, which is a substantially cylindrical tank. Reference numeral 2 denotes a heat pump type heating means, in which heated hot water is stored in a hot water storage tank 1 and hot water is supplied from a hot water tap 3 when a hot water supply request is made.

4 is a water supply pipe connected to the lower part of the hot water storage tank 1, 5 is a hot water supply pipe connected to the upper part of the hot water storage tank 1, 6 is a water supply bypass pipe branched in the middle of the water supply pipe 4, and 7 is hot water flowing through the hot water supply pipe 5. The hot water supply mixing valve that adjusts the hot water supply set temperature by mixing the city water flowing through the water supply bypass pipe 6 at an appropriate ratio, 8 is the hot water supply pipe through which the mixed water mixed by the hot water supply mixing valve 7 flows, and 9 is the hot water storage tank 1. A heating going pipe 10 connecting the lower part and the inflow side of the heating means 2 is a heating return pipe connecting the upper part of the hot water storage tank 1 and the outflow side of the heating means 2, and 11 is provided in the middle of the heating going pipe 9, and the heating means 2 is provided. It is a heating circulation pump that circulates hot water in the hot water storage tank 1 to exchange heat.

Reference numeral 12 denotes a control device that controls the operation of the hot water supply operation, and the control device 12 includes a boiling operation control means 13 that controls the heating circulation pump 11 and the heating means 2 during the boiling operation to perform the boiling operation. It is provided.

Next, the boiling operation of the hot water storage type water heater will be described.
When a boiling request is generated, the boiling operation control means 13 drives the heating circulation pump 11 and the heating means 2, and the lower part of the hot water storage tank 1 is taken out from the lower part of the hot water storage tank 1 via the heating pipe 9. The low-temperature hot water of No. 1 is heated by the heating means 2. Then, the hot water heated by the heating means 2 so as to reach a predetermined boiling temperature is stored in a laminated manner from the upper part of the hot water storage tank 1 via the heating return pipe 10, and is heated while being circulated by the circulation pump 11. By repeating the above, the inside of the hot water storage tank 1 is made into hot water.

Next, the hot water supply operation will be described. When the hot water tap 3 is opened and hot water is supplied, the pressure on the hot water supply pipe 8 side decreases, the water supply from the water supply pipe 4 is supplied from the lower part of the hot water storage tank 1, and the hot water in the high temperature layer above the hot water storage tank 1 is discharged. It is pushed out to 5. On the other hand, the water supplied from the water supply pipe 4 is mixed with the hot water from the hot water outlet pipe 5 by the hot water supply mixing valve 7 via the water supply bypass pipe 6, and is supplied to the hot water tap 3 via the hot water supply pipe 8. In this way, inside the hot water storage tank 1, the hot water supply operation is performed, so that the water from the water supply pipe 4 is on the lower layer side and the hot water is pushed up by the water supply on the upper layer. Then, the upper part of the hot water storage tank 1 becomes hot water, and the lower part of the hot water storage tank 1 becomes cold water.

Next, the first embodiment will be described with reference to FIG.
By the boiling operation and the hot water supply operation, hot water in the high temperature layer is stored in the upper part of the hot water storage tank 1 and hot water in the low temperature layer is stored in the lower part. Generally, in order to prevent heat dissipation from the hot water storage tank 1 that stores hot water to the outside of the tank, the hot water storage tank 1 is covered with a foamed heat insulating material made of a foamed plastic material such as heat-resistant foamed polystyrene. The foamed heat insulating material covers the side surface of the hot water storage tank 1 by combining the right side heat insulating material 14 that covers the right half of the hot water storage tank 1 and the left side heat insulating material 15 that covers the left half, and the upper surface heat insulating material 16 and the lower surface heat insulating material. By covering the top and bottom with 17, the entire circumference of the hot water storage tank 1 is covered.

Then, the foamed heat insulating material made of heat-resistant expanded polystyrene is foamed about 30 to 80 times by pre-foaming the raw material beads made of polystyrene resin and a hydrocarbon-based foaming agent, filling the mold, and heating. , Molded by cooling the mold and taking it out. By setting different foaming ratios in the pre-foamed state, heat insulating materials having different foaming ratios can be produced. For example, in the case where the foaming ratios are changed above and below the heat insulating material as in the first embodiment, pre-foaming is performed at a low ratio. By filling the upper side of the mold with the one that has been pre-foamed at a high magnification and then filling the lower side of the mold and heating it, one foam insulation material has a heat insulating material with a different expansion ratio. It can be molded, and a heat insulating material having high heat insulating performance can be obtained by lowering the foaming ratio at a place where heat insulating is particularly necessary.

In addition, since heat insulation performance is required to be high on the high temperature layer side, by lowering the foaming ratio, heat dissipation of the stored high temperature hot water is surely suppressed, and on the low temperature layer side where the heat dissipation of hot water is not as large as that of the high temperature layer side. Instead, the foaming ratio is increased and the heat insulating material is molded with a small amount of polystyrene, so that the molding cost of the heat insulating material can be reduced.

In the first embodiment, the side surface is covered with the semicircular thin plate-shaped right side heat insulating material 14 and the left side heat insulating material 15, and the top and bottom of the hot water storage tank 1 are covered with the hemispherical upper surface heat insulating material 16 and the lower surface heat insulating material 17. As a result, it covers the entire circumference of the hot water storage tank 1. Further, the right side heat insulating material 14 is the right side heat insulating material upper part 14a covering the upper part and the right side heat insulating material lower part 14b covering the lower part, and the right side heat insulating material upper part 14a uses a heat insulating material having a low foaming ratio, and the right side heat insulating material lower part. For 14b, a heat insulating material having a higher foaming ratio than that of the upper portion 15a of the heat insulating material on the right side is used, and the heat insulating material is integrally molded so that the foaming ratio differs between the upper and lower sides. Further, the left side heat insulating material 15 is also a heat insulating material in which the left side heat insulating material upper portion 15a covering the upper portion and the left side heat insulating material lower portion 15b covering the lower portion are integrally molded.

In this way, the upper part of the hot water storage tank 4 which is close to the hot water discharge pipe 6 and stores relatively high temperature hot water is covered with the right side heat insulating material upper part 14a and the left side heat insulating material upper part 15a having a low foaming ratio and high heat insulating performance. The lower part of the hot water storage tank 4 which is close to the water supply pipe 5 and stores relatively low temperature hot water is covered with the lower right side heat insulating material 14b and the left side heat insulating material lower part 15b which have high foaming ratio and low heat insulating performance. By making the foaming ratios different from each other, it is possible to enhance the heat insulating effect of relatively high temperature hot water close to the hot water discharge pipe 6 on the upper part of the hot water storage tank 4, and also to the right side heat insulating material upper part 14a and the right side heat insulating material lower part 14b. By integrally molding the left side heat insulating material lower part 15a and the left side heat insulating material lower part 15b, the increase in the number of parts for manufacturing a plurality of heat insulating materials having different foaming ratios can be suppressed, and the man-hours can be increased. It is possible to prevent the manufacturing cost from increasing.

Further, in the first embodiment, as shown in FIG. 3, the boundary line between the right side heat insulating material upper part 14a and the right side heat insulating material lower part 14b having different foaming ratios is formed in a substantially horizontal direction along the thickness direction, and is also formed. The height position of the boundary line located on the inside is different from that of the stepped shape, and the right side heat insulating material upper part 14a is convex downward, the right side heat insulating material downward convex portion 14c, and the right side heat insulating material lower part 14b. The right side heat insulating material that is convex upward faces the upward convex portion 14d, and the boundary line of the heat insulating material has a stepped shape.

Further, the boundary line between the left side heat insulating material upper portion 15a and the left side heat insulating material 15b having different foaming ratios is also formed in a substantially horizontal direction along the thickness direction, and if the height position of the inner boundary line is different. It has a stepped shape, and the right side heat insulating material upper part 15a is convex downward on the right side heat insulating material downward convex part 15c, and the right side heat insulating material lower part 16b is convex upward on the right side heat insulating material upward convex part 15d. The boundary line of the heat insulating material has a stepped shape.

Further, the upper surface heat insulating material 16, the right side heat insulating material upper 14a, and the left side heat insulating material 15a, which cover the upper part of the hot water storage tank 1 for storing relatively high temperature hot water, are collectively referred to as a low foaming ratio heat insulating material 21 and have a relatively low temperature. The lower surface heat insulating material 17, the upper right heat insulating material 14b, and the left side heat insulating material 15b, which cover the lower part of the hot water storage tank 1 for storing the hot water, are collectively referred to as the heat insulating material 22 having a high foaming ratio.

Since the shape is stepped in this way, even if cracks occur at the boundary line with the heat insulating materials having different foaming ratios due to the difference in material characteristics, a gap is generated, as shown in FIG. 3 (d). ), The right side heat insulating material downward convex portion 14c which is convex downward and the right side heat insulating material upward convex portion 14d which is convex upward, or the left side heat insulating material upward convex portion 15d and the left side heat insulating material downward convex portion. By staggering the convex portions as in the portion 15c, it is possible to prevent the hot water storage tank 1 from being exposed, and to prevent the heat insulating performance from being lowered and energy being wasted.

Next, the method for producing the foamed heat insulating material will be described in detail with reference to FIG.
First, as shown in FIG. 4A, the foam insulation mold 18 is provided with an upper injection port 19a and a lower injection port 19b on opposite sides, respectively, and an upper partition plate 20a is provided between the two injection ports 19, respectively. And the lower partition plate 20b is provided.

Then, as shown in FIG. 4B, the beads of the pre-foamed low-foaming ratio heat insulating material 21 are filled from the upper injection port 19a, and the pre-foamed beads of the high-foaming ratio heat insulating material 22 are placed on the lower side. From the injection port 19b, the filling pressure and the filling timing are adjusted, and the foam insulation mold 18 is evenly filled up and down.

As a result, as shown in (c) of FIG. 4, the beads of each polyether styrene are filled by bypassing the partition plate 20, and the boundary line of the different heat insulating material as shown in (d) is stepped. It becomes a attached shape and is filled with beads of foamed polyester styrene.

Then, when the required amount of foamed polyester styrene beads has been filled into each injection port 19, each partition plate 20 is pulled out as shown in FIG. 4 (e), and then each bead is heated by steam or the like. By expanding the grains to fuse the grains together, cooling the inside of the heat insulating material mold 18, and taking out the molded product from the heat insulating mold 18, the heat insulating material having a different foaming ratio as shown in (f). It is possible to manufacture a foamed heat insulating material having a stepped shape at the boundary line of the above.

It should be noted that the present invention is not limited to the embodiment and does not prevent modification without changing the gist. For example, in the first embodiment, in the embodiment of the present invention, a heat pump type heating means is used. As described in 2, an electric water heater equipped with a heater may be used.

Further, although the present invention has been described with respect to foamed polyester styrene, the present invention is not limited to the embodiments, and may be, for example, expanded polystyrene.

Further, in addition to the foaming ratio, the upper part of the heat insulating material may be made of a material having heat resistance, and the lower part of the heat insulating material may be made of a material having lower heat resistance, and the materials may be different in the upper and lower parts.

1 Tank unit 2 Heater 14 Right side insulation 14a Right side insulation upper 14a Right side insulation lower 15 Left side insulation 15a Left side insulation upper 15b Left side insulation lower 18 Insulation mold 19 Injection port 19a Upper injection port 19b Lower injection port 20 Partition plate 20a Upper partition plate 20b Lower partition plate 21 Insulation material with low foaming ratio 22 Insulation material with high foaming ratio

Claims (3)

It is a foamed heat insulating material that prevents heat dissipation from the heat insulating object. The foamed heat insulating material is obtained by integrally molding two types of heat insulating materials having different foaming ratios or two types of heat insulating materials having different materials by two-color molding. The boundary line between these two different types of heat insulating materials has a stepped shape, and the boundary line having the stepped shape is a foamed heat insulating material obtained by fusing the two different types of heat insulating materials. .. The foamed heat insulating material has a substantially thin plate shape, the boundary line is formed along the thickness direction of the foamed heat insulating material, and the boundary line is formed at different positions on one surface and the other surface of the substantially thin plate shape. The foamed heat insulating material according to claim 1, wherein a stepped boundary line is formed. A hot water storage type water heater having a hot water storage tank covered with the foamed heat insulating material according to claim 2, wherein the type of the heat insulating material is different between the upper part and the lower part of the hot water storage tank, and the water heater is located at the upper part. The heat insulating performance of the above-mentioned type of heat insulating material is higher than that of other types of heat insulating materials located at the lower part, and the boundary line is provided in a substantially horizontal direction to provide the boundary line located inside the foamed heat insulating material. A hot water storage type water heater characterized in that the boundary line has a stepped shape with a different height position from the line.

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