WO2020217270A1 - Polyurethane foam insulation material and storage water heater - Google Patents

Polyurethane foam insulation material and storage water heater Download PDF

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Publication number
WO2020217270A1
WO2020217270A1 PCT/JP2019/016978 JP2019016978W WO2020217270A1 WO 2020217270 A1 WO2020217270 A1 WO 2020217270A1 JP 2019016978 W JP2019016978 W JP 2019016978W WO 2020217270 A1 WO2020217270 A1 WO 2020217270A1
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WO
WIPO (PCT)
Prior art keywords
hot water
heat insulating
water storage
density
insulating material
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Application number
PCT/JP2019/016978
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French (fr)
Japanese (ja)
Inventor
直紀 柴崎
謙作 畑中
修平 内藤
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021515323A priority Critical patent/JP7156510B2/en
Priority to PCT/JP2019/016978 priority patent/WO2020217270A1/en
Publication of WO2020217270A1 publication Critical patent/WO2020217270A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details

Definitions

  • the present invention relates to a polyurethane foam heat insulating material and a hot water storage type water heater.
  • Patent Document 1 discloses a hot water storage type water heater in which a space between a hot water storage tank and an outer box is filled with foamed polyurethane.
  • the polyurethane foam heat insulating material may be damaged during long-term use.
  • the present invention has been made to solve the above-mentioned problems, and is an advantageous foamed polyurethane heat insulating material for improving durability when used in a hot water storage type water heater, and the foamed polyurethane heat insulating material. It is an object of the present invention to provide a hot water storage type water heater equipped with materials.
  • the polyurethane foam heat insulating material of the present invention is a polyurethane foam heat insulating material that covers a hot water storage tank of a hot water storage type water heater, and includes a low-density portion and at least one high-density portion having a higher density than the low-density portion. At least one high-density portion includes a support portion that supports the components of the hot water storage type water supply machine. Further, the polyurethane foam heat insulating material of the present invention is a polyurethane foam heat insulating material that covers the hot water storage tank of the hot water storage type water heater, and has a low density portion and at least one high density portion having a higher density than the low density portion.
  • the at least one high-density portion includes an inner wall portion having an inner surface in contact with the surface of the hot water storage tank, and the outer wall portion having an outer surface which is a surface opposite to the inner surface corresponds to a low-density portion.
  • the hot water storage type water heater of the present invention includes the above-mentioned polyurethane foam heat insulating material and the above-mentioned hot water storage tank.
  • a polyurethane foam heat insulating material which is advantageous in improving durability when used in a hot water storage water heater, and a hot water storage water heater provided with the polyurethane foam heat insulating material. Is possible.
  • FIG. 1 It is a front view which shows the hot water storage type water heater by Embodiment 1.
  • FIG. It is a vertical cross-sectional view which shows the hot water storage tank provided in the hot water storage type water heater shown in FIG. 1, and the heat insulating material which covers the hot water storage tank.
  • FIG. 1 It is sectional drawing which shows the hot water storage tank unit provided in the hot water storage type water heater shown in FIG.
  • FIG. 1 is a front view showing a hot water storage type water heater 50 according to the first embodiment.
  • the hot water storage type water heater 50 of the first embodiment includes a heat pump unit 1 and a hot water storage tank unit 40.
  • the hot water storage tank unit 40 has a hot water storage tank 10 having a cylindrical outer shape and an outer case 30 having a substantially rectangular parallelepiped shape.
  • the hot water storage tank 10 is housed in the outer case 30 in a state of being covered with a heat insulating material described later.
  • the heat pump unit 1 functions as a heating means for heating water to generate hot water.
  • the hot water stored in the hot water storage tank 10 is supplied to a predetermined hot water supply destination as needed.
  • the heating means in the present disclosure is not limited to the heat pump type, and may be any configuration such as a configuration in which a heater is installed in the hot water storage tank 10.
  • a mixing valve 15 for adjusting the hot water supply temperature is provided in the outer case 30.
  • the water supply pipe 11 supplies water from a water source such as a water supply.
  • the downstream portion of the water supply pipe 11 branches in the outer case 30 and is connected to the lower portion of the hot water storage tank 10 and the mixing valve 15, respectively.
  • a heat pump going pipe 13a for sending the low temperature water in the hot water storage tank 10 to the heat pump unit 1 is further connected to the lower part of the hot water storage tank 10.
  • a heat pump return pipe 13b for returning the hot water heated by the heat pump unit 1 to the inside of the hot water storage tank 10 is connected to the upper part of the hot water storage tank 10.
  • the hot water supply pipe 12 is a pipe for supplying hot water to a predetermined hot water tap (not shown) such as a shower in a bathroom or a faucet in a kitchen.
  • the bath going pipe 14 is a pipe for supplying hot water to a bathtub (not shown).
  • the upper surface of the outer case 30 of the hot water storage tank unit 40 is composed of a top plate 32. Further, a riser portion 31 with the front side retracted is formed in the lower portion of the outer case 30.
  • the riser portion 31 Each pipe connection is provided for pulling out.
  • a support leg 35 is connected to the lower part of the outer case 30.
  • the hot water storage tank unit 40 is installed on the base 90 by fixing each support leg 35 to the concrete base 90 with anchor bolts (not shown).
  • a pipe cover (not shown) is provided below the outer case 30. Provided.
  • the hot water storage type water heater 50 When the hot water storage type water heater 50 is used, it becomes as follows. In the hot water storage tank 10, the upper side becomes hot water and the lower side becomes cold water. The hot water in the upper layer and the cold water in the lower layer are maintained without being mixed due to the difference in specific gravity. By supplying water from the water supply pipe 11, the inside of the hot water storage tank 10 is always kept full with the high temperature water in the upper layer and the low temperature water in the lower layer. Further, the water supply pressure from the water supply pipe 11 always acts in the hot water storage tank 10.
  • the result is as follows.
  • the low-temperature water in the lower part of the hot water storage tank 10 is sent to the water-refrigerant heat exchanger in the heat pump unit 1 through the heat pump going pipe 13a.
  • the hot water after being heated by the water-refrigerant heat exchanger passes through the heat pump return pipe 13b and flows into the hot water storage tank 10 from the upper part of the hot water storage tank 10.
  • the tank upper pipe 16 connects the upper part of the hot water storage tank 10 and the mixing valve 15.
  • the high temperature hot water in the hot water storage tank 10 flows into the mixing valve 15 through the tank upper pipe 16 due to the water supply pressure from the water supply pipe 11.
  • the mixing valve 15 generates hot water at a temperature set by the user with a remote controller (not shown) or the like by adjusting the mixing ratio of the hot water from the tank upper pipe 16 and the low temperature water from the water supply pipe 11. ..
  • the hot water mixed by the mixing valve 15 is supplied to the hot water tap or the bathtub through the hot water supply pipe 12 or the bath going pipe 14.
  • Equipment other than the above-mentioned equipment such as piping, valves, pumps, heat exchangers, sensors, and control devices, may be further provided inside the outer case 30, but in the present disclosure, they may be further illustrated and illustrated. Detailed description will be omitted.
  • FIG. 2 is a vertical cross-sectional view showing a hot water storage tank 10 included in the hot water storage type water heater 50 shown in FIG. 1 and a heat insulating material covering the hot water storage tank 10.
  • FIG. 3 is a cross-sectional plan view showing a hot water storage tank unit 40 included in the hot water storage type water heater 50 shown in FIG.
  • the central axis of the hot water storage tank 10 is hereinafter referred to as "tank central axis".
  • the hot water storage type water heater 50 is installed in a posture in which the central axis of the tank is substantially parallel to the vertical line. In the following description, the positional relationship is specified with reference to the posture when the hot water storage type water heater 50 is used.
  • FIG. 3 corresponds to a cross-sectional view cut in a plane perpendicular to the central axis of the tank.
  • the lower side in FIG. 3 corresponds to the front surface of the hot water storage tank unit 40, and the upper side in FIG. 3 corresponds to the rear surface of the hot water storage tank unit 40.
  • FIG. 2 is a cross-sectional view cut along a plane including the central axis of the tank, and corresponds to a cross-sectional view of the hot water storage tank 10 and the heat insulating material cut along the line II-II in FIG.
  • equipment other than the hot water storage tank 10, the heat insulating material, and the outer case 30 is not shown.
  • the hot water storage tank 10 is made of a metal material such as stainless steel. As shown in FIG. 2, the hot water storage tank 10 has a cylindrical tank body 10a, an upper end plate 10b that closes the upper opening of the tank body 10a, and a lower end plate 10c that closes the lower opening of the tank body 10a. ..
  • the upper end plate 10b has a hemispherical or upside-down bowl-shaped shape.
  • the lower end plate 10c has a hemispherical or bowl-shaped shape.
  • the hot water storage type water heater 50 of the present embodiment includes an upper heat insulating material 60, a front heat insulating material 61, a rear heat insulating material 62, and a lower heat insulating material 63 as heat insulating materials for covering the hot water storage tank 10.
  • Each of these insulations corresponds to a polyurethane foam insulation.
  • the polyurethane foam heat insulating material is formed by molding polyurethane foam using a mold (not shown).
  • the polyurethane foam heat insulating material may correspond to a rigid urethane foam.
  • the upper heat insulating material 60 covers the surface of the upper end plate 10b at least partially.
  • the front insulation 61 and the rear insulation 62 cover the surface of the tank body 10a at least partially.
  • the front heat insulating material 61 covers a half region of the surface of the tank body 10a that corresponds to the front side.
  • the rear heat insulating material 62 covers a half region of the surface of the tank body 10a, which is on the rear side.
  • the lower insulation 63 covers the surface of the lower end plate 10c at least partially.
  • the foamed polyurethane heat insulating material has a structure in which a gas having low thermal conductivity is confined in a fine cell in which each is independent, and has excellent heat insulating performance.
  • the foamed polyurethane heat insulating material is made, for example, by injecting a urethane stock solution, which is a mixture of two stock solutions containing polyol and polyisocyanate as main components in a foaming machine, into a mold in a liquid state, foaming and curing.
  • urethane stock solution There are two methods for injecting urethane stock solution: a closed injection method in which the urethane stock solution is injected from a specific injection port after the mold is closed, and an open injection method in which the urethane stock solution is injected with the mold open.
  • a polyurethane foam heat insulating material made by a closed injection method will be mainly described as an example.
  • the foamed polyurethane heat insulating material according to the present disclosure has a low density portion and at least one high density portion.
  • the high density portion has a higher density than the low density portion.
  • the density of the polyurethane foam insulation means the apparent density.
  • the apparent density is a density calculated by calculating the sum of the volume occupied by the substance itself and the volume of the internal voids as the volume for density calculation.
  • the high-density part has higher heat insulation than the low-density part. That is, the thermal conductivity of the high-density portion is lower than the thermal conductivity of the low-density portion. Further, the high-density portion has higher mechanical strength than the low-density portion. Mechanical strength is the resistance of a material to deformation or fracture. Mechanical strength can be expressed, for example, by at least one of tensile strength, compressive strength, and shear strength.
  • mold space a space having a shape corresponding to the shape of the polyurethane foam heat insulating material (hereinafter referred to as "mold space") is formed.
  • the portion that becomes the inlet of the urethane stock solution into the mold space during molding of the foamed polyurethane heat insulating material is referred to as a “raw material inlet portion”.
  • the foamed polyurethane heat insulating material is manufactured by the closed injection method, the density tends to be low in the region far from the raw material inlet portion and high in the region close to the raw material inlet portion.
  • the front heat insulating material 61 has a support portion 61a that supports components (not shown) of the hot water storage type water heater 50.
  • the component may be, for example, at least one of a pipe, a valve, a pump, a heat exchanger, a sensor, and a control device.
  • the component may be fixed to the support 61a using, for example, at least one of a screw, an adhesive tape, a snap fit, and an uneven fit.
  • the support portion 61a supports at least a part of the weight of the component. In the illustrated example, the support portion 61a projects outward from the outer peripheral surface 61b, which is the surface of the front heat insulating material 61.
  • the front heat insulating material 61 has a low density portion 61c.
  • the support portion 61a corresponds to a high-density portion having a higher density than the low-density portion 61c.
  • the weight of the component acts on the support portion 61a. Therefore, if the mechanical strength of the support portion 61a is low, the support portion 61a may be deformed during long-term use, and the component parts may not be held in an appropriate position.
  • the support portion 61a corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the support portion 61a. Therefore, since the deformation of the support portion 61a can be reliably prevented during long-term use, it is advantageous in improving the durability of the front heat insulating material 61 including the support portion 61a.
  • the front heat insulating material 61 has a raw material inlet portion 61d.
  • the support portion 61a is located near the raw material inlet portion 61d.
  • the low density portion 61c is located farther from the raw material inlet portion 61d than the support portion 61a.
  • the raw material inlet portion 61d corresponds to a part of the support portion 61a. This is advantageous in increasing the density of the support portion 61a, which is more advantageous in improving the mechanical strength of the support portion 61a.
  • the support portion 61a and the raw material inlet portion 61d are located higher than the low density portion 61c with respect to the vertical position.
  • the upper heat insulating material 60 has an inner wall portion 60a and an outer wall portion 60b.
  • the inner wall portion 60a has an inner surface 60c in contact with the surface of the upper end plate 10b.
  • the inner surface 60c is a concave curved surface having a shape corresponding to the convex curved surface of the surface of the upper end plate 10b.
  • the outer wall portion 60b has an outer surface 60d which is a surface facing the side opposite to the inner surface 60c.
  • the outer wall portion 60b is located outside the inner wall portion 60a.
  • the outer wall portion 60b does not come into contact with the surface of the hot water storage tank 10.
  • the outer wall portion 60b is located farther from the surface of the hot water storage tank 10 than the inner wall portion 60a.
  • the outer wall portion 60b corresponds to the low density portion.
  • the inner wall portion 60a corresponds to a high-density portion having a higher density than the outer wall portion 60b. Since the inner wall portion 60a is in contact with the surface of the hot water storage tank 10 which becomes hot, it is exposed to a higher temperature than the outer wall portion 60b. As a result, the inner wall portion 60a is more likely to be thermally deteriorated than the outer wall portion 60b. Therefore, if the mechanical strength of the inner wall portion 60a is low, the gas inside the cell cannot be trapped due to the breakage of the cell wall of the inner wall portion 60a during long-term use, and the heat insulating performance of the inner wall portion 60a deteriorates. there is a possibility.
  • the inner wall portion 60a corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the inner wall portion 60a. Therefore, the above-mentioned damage to the inner wall portion 60a can be reliably prevented during long-term use, which is advantageous in improving the durability of the upper heat insulating material 60 including the inner wall portion 60a.
  • the upper heat insulating material 60 has a raw material inlet portion 60e.
  • the inner wall portion 60a is located near the raw material inlet portion 60e.
  • the outer wall portion 60b is located farther from the raw material inlet portion 60e than the inner wall portion 60a.
  • the raw material inlet portion 60e corresponds to a part of the inner wall portion 60a. This is advantageous in increasing the density of the inner wall portion 60a, and is more advantageous in improving the mechanical strength of the inner wall portion 60a.
  • the lower heat insulating material 63 has an inner wall portion 63a and an outer wall portion 63b.
  • the inner wall portion 63a has an inner surface 63c in contact with the surface of the lower end plate 10c.
  • the inner surface 63c is a concave curved surface having a shape corresponding to the convex curved surface of the surface of the lower end plate 10c.
  • the outer wall portion 63b has an outer surface 63d which is a surface facing the side opposite to the inner surface 63c.
  • the outer wall portion 63b is located outside the inner wall portion 63a.
  • the outer wall portion 63b does not come into contact with the surface of the hot water storage tank 10.
  • the outer wall portion 63b is located farther from the surface of the hot water storage tank 10 than the inner wall portion 63a.
  • the outer wall portion 63b corresponds to the low density portion.
  • the inner wall portion 63a corresponds to a high-density portion having a higher density than the outer wall portion 63b.
  • the inner wall portion 63a corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the inner wall portion 63a. Therefore, the above-mentioned damage to the inner wall portion 63a can be reliably prevented during long-term use, which is advantageous in improving the durability of the lower heat insulating material 63 including the inner wall portion 63a.
  • the lower heat insulating material 63 has a raw material inlet portion 63e.
  • the inner wall portion 63a is located near the raw material inlet portion 63e.
  • the outer wall portion 63b is located farther from the raw material inlet portion 63e than the inner wall portion 63a.
  • the raw material inlet portion 63e corresponds to a part of the inner wall portion 63a. This is advantageous in increasing the density of the inner wall portion 63a, and is more advantageous in improving the mechanical strength of the inner wall portion 63a.
  • the rear surface heat insulating material 62 has a fitting portion 62a that fits into the upper heat insulating material 60, which is another heat insulating material, and a low density portion 62b.
  • the fitting portion 62a corresponds to a high-density portion having a higher density than the low-density portion 62b. If the mechanical strength of the fitting portion 62a is low, the fitting portion 62a may be deformed during long-term use, and a gap may be formed between the fitting portion 62a and the upper heat insulating material 60. The formation of gaps is not preferable because it leads to heat leakage.
  • the fitting portion 62a corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the fitting portion 62a. Therefore, deformation of the fitting portion 62a can be reliably prevented during long-term use. Therefore, it is possible to reliably prevent a gap from being formed between the upper heat insulating material 60 and the upper heat insulating material 60, so that heat leakage can be reliably prevented.
  • the rear heat insulating material 62 has a raw material inlet portion 62c.
  • the fitting portion 62a is located near the raw material inlet portion 62c.
  • the low density portion 62b is located farther from the raw material inlet portion 62c than the fitting portion 62a.
  • the fitting portion 62a and the raw material inlet portion 62c are located higher than the low density portion 62b with respect to the vertical position.
  • the front heat insulating material 61 has a fitting portion 61e that fits into the upper heat insulating material 60, which is another heat insulating material, and a low density portion 61f.
  • the fitting portion 61e corresponds to a high-density portion having a higher density than the low-density portion 61f. If the mechanical strength of the fitting portion 61e is low, the fitting portion 61e may be deformed during long-term use, and a gap may be formed between the fitting portion 61e and the upper heat insulating material 60. The formation of gaps is not preferable because it leads to heat leakage.
  • the fitting portion 61e corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the fitting portion 61e. Therefore, deformation of the fitting portion 61e can be reliably prevented during long-term use. Therefore, it is possible to reliably prevent a gap from being formed between the upper heat insulating material 60 and the upper heat insulating material 60, so that heat leakage can be reliably prevented.
  • the front heat insulating material 61 has a raw material inlet portion of 61 g.
  • the fitting portion 61e is located near the raw material inlet portion 61g.
  • the low density portion 61f is located farther from the raw material inlet portion 61g than the fitting portion 61e.
  • the positions in the vertical direction are as follows.
  • the fitting portion 61e and the raw material inlet portion 61g are located higher than the low density portion 61f.
  • the low density portion 61f is located higher than the support portion 61a and the raw material inlet portion 61d.
  • each of the fitting portion 61e and the fitting portion 62a protrudes upward.
  • Each of the fitting portion 61e and the fitting portion 62a forms an arc shape along the circumferential direction of the tank body portion 10a at a position away from the surface of the tank body portion 10a.
  • An annular protrusion is formed by connecting both ends of the fitting portion 61e to both ends of the fitting portion 62a.
  • the upper heat insulating material 60 has a fitting portion 60f.
  • the fitting portion 60f is a protruding portion that protrudes downward.
  • the fitting portion 60f is formed in an annular shape along the outer peripheral surface of the tank body portion 10a or the upper end plate 10b.
  • the fitting portion 60f is fitted on the inner peripheral side of the annular projecting portion formed by the fitting portion 61e and the fitting portion 62a.
  • the front heat insulating material 61 has a support portion 61a and a fitting portion 61e corresponding to a plurality of high-density portions provided at different positions from each other. As described above, a plurality of high-density portions may be provided at different positions in the single polyurethane foam heat insulating material. This is more advantageous in improving the durability of the foamed polyurethane heat insulating material.
  • the front heat insulating material 61 has a plurality of raw material inlets 61d and raw material inlets 61g that are located at different positions from each other. That is, the mold for molding the front heat insulating material 61 is provided with inlets of the urethane stock solution into the mold space at a plurality of positions. In this way, a plurality of urethane stock solution inlets may be provided in one mold space. By doing so, a plurality of high-density portions can be provided at different positions in the single polyurethane foam insulation material.
  • the support portion 61a and the fitting portion 61e correspond to a high place portion located higher than the low density portion 61c with respect to the position in the vertical direction. Further, the fitting portion 62a corresponds to a high place portion located at a position higher than the low density portion 62b with respect to the position in the vertical direction. In the present embodiment, the following effects can be obtained by providing such a high place.
  • the temperature of the hot water in the hot water storage tank 10 becomes higher as the position is higher. Since the support portion 61a, the fitting portion 61e, and the fitting portion 62a corresponding to the high-density portion having high heat insulation performance are arranged at high positions, the heat insulation property of the high temperature region of the hot water storage tank 10 can be further improved.
  • the temperature of the hot water in the hot water storage tank 10 is relatively low, so that the heat insulating performance of the low-density portion 61c and the low-density portion 62b is sufficient.
  • the hot water storage type water heater 50 may be provided with a low-place heat insulating material having a higher thermal conductivity than the foamed polyurethane heat insulating material.
  • the lower heat insulating material 63 may be made of expanded polystyrene instead of made of expanded polyurethane.
  • the lower heat insulating material 63 is a low-place heat insulating material that covers the hot water storage tank 10 at a position lower than the upper heat insulating material 60, the front heat insulating material 61, and the rear heat insulating material 62, which are polyurethane foam heat insulating materials, in the vertical position. Corresponds to.
  • the temperature of the hot water in the hot water storage tank 10 is relatively low in the region where the low-place heat insulating material is arranged, sufficient heat insulating performance can be obtained even with the low-place heat insulating material having a higher thermal conductivity than the foamed polyurethane heat insulating material. .. Cost can be reduced by using a low-place heat insulating material having a higher thermal conductivity than the polyurethane foam heat insulating material.
  • the thickness dimension of the heat insulating material shall be the dimension in the radial direction of the hot water storage tank 10. That is, the thickness dimension is the thickness of the heat insulating material measured along a straight line orthogonal to the central axis of the tank. Further, the distance between the tank surface, which is the surface of the hot water storage tank 10, and the inner wall 30a of the outer case 30, measured along the normal line of the tank surface is referred to as "opposing distance". In a region where the facing distance is small, it is difficult to increase the thickness dimension of the heat insulating material.
  • the front heat insulating material 61 has a thin-walled portion 61h, a thin-walled portion 61i, and a low-density portion 61j.
  • the thin-walled portion 61h is arranged at a position where the facing distance D2 is smaller than the facing distance D1 at the position of the low-density portion 61j.
  • the thin-walled portion 61i is arranged at a position where the facing distance D3 is smaller than the facing distance D1 at the position of the low-density portion 61j.
  • the thickness dimensions of the thin portion 61h and 61i are smaller than the thickness dimensions of the low density portion 61j.
  • Each of the thin-walled portions 61h and 61i corresponds to a high-density portion having a higher density than the low-density portion 61j.
  • the thickness of the thin parts 61h and 61i is smaller than that of the low density part 61j, if the mechanical strength of the thin parts 61h and 61i is low, the thin parts 61h and 61i may be deformed during long-term use. is there.
  • the thin-walled portions 61h and 61i correspond to the high-density portion, it is advantageous in increasing the mechanical strength of the thin-walled portions 61h and 61i. Therefore, deformation of the thin-walled portions 61h and 61i can be reliably prevented during long-term use, which is advantageous in improving the durability of the thin-walled portions 61h and 61i.
  • the thin-walled portions 61h and 61i have a smaller thickness than the low-density portion 61j, it is difficult to improve the heat insulating performance of the thin-walled portions 61h and 61i if the thin-walled portions 61h and 61i have high thermal conductivity. ..
  • the thin-walled portions 61h and 61i correspond to the high-density portion, it is advantageous in reducing the thermal conductivity of the thin-walled portions 61h and 61i. Therefore, it is advantageous in improving the heat insulating performance of the thin-walled portions 61h and 61i.
  • the front heat insulating material 61 has a raw material inlet portion 61k and a raw material inlet portion 61m.
  • the thin-walled portion 61h is located near the raw material inlet portion 61k.
  • the thin-walled portion 61i is located near the raw material inlet portion 61m.
  • the low-density portion 61j is located farther from both the raw material inlet portions 61k and 61m than the thin-walled portions 61h and 61i.
  • the rear surface heat insulating material 62 has a thin-walled portion 62d, a thin-walled portion 62e, and a low-density portion 62f.
  • the thin-walled portion 62d is arranged at a position where the facing distance D2 is smaller than the facing distance D4 at the position of the low-density portion 62f.
  • the thin-walled portion 62e is arranged at a position where the facing distance D3 is smaller than the facing distance D4 at the position of the low-density portion 62f.
  • the thickness dimensions of the thin portions 62d and 62e are smaller than the thickness dimensions of the low density portions 62f.
  • Each of the thin-walled portions 62d and 62e corresponds to a high-density portion having a higher density than the low-density portion 62f.
  • the thickness of the thin parts 62d and 62e is smaller than that of the low density part 62f, if the mechanical strength of the thin parts 62d and 62e is low, the thin parts 62d and 62e may be deformed during long-term use. is there.
  • the thin-walled portions 62d and 62e correspond to the high-density portions, it is advantageous in increasing the mechanical strength of the thin-walled portions 62d and 62e. Therefore, deformation of the thin-walled portions 62d and 62e can be reliably prevented during long-term use, which is advantageous in improving the durability of the thin-walled portions 62d and 62e.
  • the thin-walled portions 62d and 62e have a smaller thickness than the low-density portions 62f, it is difficult to improve the heat insulating performance of the thin-walled portions 62d and 62e if the thin-walled portions 62d and 62e have high thermal conductivity. ..
  • the thin-walled portions 62d and 62e correspond to the high-density portions, it is advantageous in reducing the thermal conductivity of the thin-walled portions 62d and 62e. Therefore, it is advantageous in improving the heat insulating performance of the thin-walled portions 62d and 62e.
  • the rear heat insulating material 62 has a raw material inlet portion 62 g and a raw material inlet portion 62 h.
  • the thin-walled portion 62d is located near the raw material inlet portion 62g.
  • the thin-walled portion 62e is located near the raw material inlet portion 62h.
  • the low-density portion 62f is located farther from both the raw material inlet portions 62g and 62h than the thin-walled portions 62d and 62e.
  • the foamed polyurethane heat insulating material made by the closed injection method has focused on the foamed polyurethane heat insulating material made by the closed injection method, but the foamed polyurethane heat insulating material according to the present disclosure may be made by the open injection method.
  • urethane is moved while moving the injection port so that the injection amount of the part to be high density is larger than the injection amount of the part to be low density with the mold open. Inject the undiluted solution. After that, the mold is closed and molded.

Abstract

A polyurethane foam insulation material (61) covers the hot water storage tank (10) of a storage water heater. The polyurethane foam insulation material (61) is provided with a low-density portion (61c) and at least one high-density portion (61a, 61e) having a higher density than the low-density portion (61c). The at least one high-density portion (61a, 61e) includes a support portion (61a) that supports the components of the storage water heater. The polyurethane foam insulation material (60) covers the hot water storage tank (10) of the storage water heater. The polyurethane form insulation material (60) is provided with a low-density portion (60b) and at least one high-density portion (60a) having a higher density than the low-density portion (60b). The at least one high-density portion (60a) includes an inner wall portion (60a) with an inner surface (60c) in contact with the surface of the hot water storage tank (10). An outer wall portion (60b) having an outer surface (60d) that is the surface on the reverse side from the inner surface (60c) corresponds to the low-density portion (60b).

Description

発泡ポリウレタン断熱材及び貯湯式給湯機Polyurethane foam insulation and hot water storage type water heater
　本発明は、発泡ポリウレタン断熱材及び貯湯式給湯機に関する。 The present invention relates to a polyurethane foam heat insulating material and a hot water storage type water heater.
　発泡ポリウレタンを貯湯タンクの断熱材として用いた貯湯式給湯機が知られている。特許文献１には、貯湯タンクと外箱との間の空間に発泡ポリウレタンを充填した貯湯式給湯機が開示されている。 A hot water storage type water heater that uses polyurethane foam as a heat insulating material for a hot water storage tank is known. Patent Document 1 discloses a hot water storage type water heater in which a space between a hot water storage tank and an outer box is filled with foamed polyurethane.
日本特開昭５８－１６０７５８号公報Japanese Patent Application Laid-Open No. 58-160758
　特許文献１の技術では、長期間の使用中に発泡ポリウレタン断熱材が損傷する可能性がある。 With the technology of Patent Document 1, the polyurethane foam heat insulating material may be damaged during long-term use.
　本発明は、上述のような課題を解決するためになされたもので、貯湯式給湯機にて使用される場合の耐久性を向上する上で有利になる発泡ポリウレタン断熱材と、当該発泡ポリウレタン断熱材を備えた貯湯式給湯機とを提供することを目的とする。 The present invention has been made to solve the above-mentioned problems, and is an advantageous foamed polyurethane heat insulating material for improving durability when used in a hot water storage type water heater, and the foamed polyurethane heat insulating material. It is an object of the present invention to provide a hot water storage type water heater equipped with materials.
　本発明の発泡ポリウレタン断熱材は、貯湯式給湯機の貯湯タンクを覆う発泡ポリウレタン断熱材であって、低密度部と、低密度部よりも密度が高い少なくとも一つの高密度部と、を備え、少なくとも一つの高密度部は、貯湯式給湯機の構成部品を支持する支持部を含むものである。
　また、本発明の発泡ポリウレタン断熱材は、貯湯式給湯機の貯湯タンクを覆う発泡ポリウレタン断熱材であって、低密度部と、低密度部よりも密度が高い少なくとも一つの高密度部と、を備え、少なくとも一つの高密度部は、貯湯タンクの表面に接する内面を有する内壁部を含み、内面とは反対側の面である外面を有する外壁部は、低密度部に相当するものである。
　本発明の貯湯式給湯機は、上記発泡ポリウレタン断熱材と、上記貯湯タンクとを備えるものである。 The polyurethane foam heat insulating material of the present invention is a polyurethane foam heat insulating material that covers a hot water storage tank of a hot water storage type water heater, and includes a low-density portion and at least one high-density portion having a higher density than the low-density portion. At least one high-density portion includes a support portion that supports the components of the hot water storage type water supply machine.
Further, the polyurethane foam heat insulating material of the present invention is a polyurethane foam heat insulating material that covers the hot water storage tank of the hot water storage type water heater, and has a low density portion and at least one high density portion having a higher density than the low density portion. The at least one high-density portion includes an inner wall portion having an inner surface in contact with the surface of the hot water storage tank, and the outer wall portion having an outer surface which is a surface opposite to the inner surface corresponds to a low-density portion.
The hot water storage type water heater of the present invention includes the above-mentioned polyurethane foam heat insulating material and the above-mentioned hot water storage tank.
　本発明によれば、貯湯式給湯機にて使用される場合の耐久性を向上する上で有利になる発泡ポリウレタン断熱材と、当該発泡ポリウレタン断熱材を備えた貯湯式給湯機とを提供することが可能となる。 According to the present invention, there is provided a polyurethane foam heat insulating material which is advantageous in improving durability when used in a hot water storage water heater, and a hot water storage water heater provided with the polyurethane foam heat insulating material. Is possible.
実施の形態１による貯湯式給湯機を示す前面図である。It is a front view which shows the hot water storage type water heater by Embodiment 1. FIG. 図１に示す貯湯式給湯機が備える貯湯タンクと、貯湯タンクを覆う断熱材とを示す縦断面図である。It is a vertical cross-sectional view which shows the hot water storage tank provided in the hot water storage type water heater shown in FIG. 1, and the heat insulating material which covers the hot water storage tank. 図１に示す貯湯式給湯機が備える貯湯タンクユニットを示す断面平面図である。It is sectional drawing which shows the hot water storage tank unit provided in the hot water storage type water heater shown in FIG.
　以下、図面を参照して実施の形態について説明する。各図において共通または対応する要素には、同一の符号を付して、重複する説明を簡略化または省略する。 Hereinafter, embodiments will be described with reference to the drawings. Common or corresponding elements in the drawings are designated by the same reference numerals to simplify or omit duplicate description.
実施の形態１．
　図１は、実施の形態１による貯湯式給湯機５０を示す前面図である。図１に示すように、本実施の形態１の貯湯式給湯機５０は、ヒートポンプユニット１と、貯湯タンクユニット４０とを有する。貯湯タンクユニット４０は、円筒状の外形を有する貯湯タンク１０と、略直方体形状をなす外郭ケース３０とを有している。貯湯タンク１０は、後述する断熱材に覆われた状態で、外郭ケース３０内に収納されている。ヒートポンプユニット１は、水を加熱して湯を生成する加熱手段として機能する。貯湯タンク１０に貯留された湯は、必要に応じ所定の給湯先に供給される。なお、本開示における加熱手段は、ヒートポンプ式のものに限定されるものではなく、例えば、貯湯タンク１０内にヒータを設置する構成など、いかなる構成でもよい。 Embodiment 1.
FIG. 1 is a front view showing a hot water storage type water heater 50 according to the first embodiment. As shown in FIG. 1, the hot water storage type water heater 50 of the first embodiment includes a heat pump unit 1 and a hot water storage tank unit 40. The hot water storage tank unit 40 has a hot water storage tank 10 having a cylindrical outer shape and an outer case 30 having a substantially rectangular parallelepiped shape. The hot water storage tank 10 is housed in the outer case 30 in a state of being covered with a heat insulating material described later. The heat pump unit 1 functions as a heating means for heating water to generate hot water. The hot water stored in the hot water storage tank 10 is supplied to a predetermined hot water supply destination as needed. The heating means in the present disclosure is not limited to the heat pump type, and may be any configuration such as a configuration in which a heater is installed in the hot water storage tank 10.
　給湯温度を調整するための混合弁１５が外郭ケース３０内に設けられている。給水配管１１は、例えば上水道のような水源からの水を供給する。給水配管１１の下流部は、外郭ケース３０内で分岐して、貯湯タンク１０の下部と混合弁１５とのそれぞれに接続されている。貯湯タンク１０の下部には、貯湯タンク１０内の低温水をヒートポンプユニット１に送るためのヒートポンプ往き配管１３ａがさらに接続されている。また、貯湯タンク１０の上部には、ヒートポンプユニット１により加熱された湯を貯湯タンク１０内へ戻すためのヒートポンプ戻り配管１３ｂが接続されている。給湯配管１２は、例えば浴室のシャワーあるいは台所の蛇口のような所定の給湯栓（図示省略）に給湯するための配管である。風呂往き配管１４は、浴槽（図示省略）に給湯するための配管である。 A mixing valve 15 for adjusting the hot water supply temperature is provided in the outer case 30. The water supply pipe 11 supplies water from a water source such as a water supply. The downstream portion of the water supply pipe 11 branches in the outer case 30 and is connected to the lower portion of the hot water storage tank 10 and the mixing valve 15, respectively. A heat pump going pipe 13a for sending the low temperature water in the hot water storage tank 10 to the heat pump unit 1 is further connected to the lower part of the hot water storage tank 10. Further, a heat pump return pipe 13b for returning the hot water heated by the heat pump unit 1 to the inside of the hot water storage tank 10 is connected to the upper part of the hot water storage tank 10. The hot water supply pipe 12 is a pipe for supplying hot water to a predetermined hot water tap (not shown) such as a shower in a bathroom or a faucet in a kitchen. The bath going pipe 14 is a pipe for supplying hot water to a bathtub (not shown).
　貯湯タンクユニット４０の外郭ケース３０の上面は、天板３２で構成されている。また、外郭ケース３０の下部には、前面側が引っ込んだ蹴込み部３１が形成されている。蹴込み部３１には、上述した給水配管１１、ヒートポンプ往き配管１３ａ、ヒートポンプ戻り配管１３ｂ、給湯配管１２、風呂往き配管１４の各々を貯湯タンクユニット４０内に引き込むため、または貯湯タンクユニット４０内から引き出すための配管接続部がそれぞれ設けられている。 The upper surface of the outer case 30 of the hot water storage tank unit 40 is composed of a top plate 32. Further, a riser portion 31 with the front side retracted is formed in the lower portion of the outer case 30. In order to draw each of the above-mentioned water supply pipe 11, heat pump going pipe 13a, heat pump return pipe 13b, hot water supply pipe 12, and bath going pipe 14 into the hot water storage tank unit 40, or from inside the hot water storage tank unit 40, the riser portion 31 Each pipe connection is provided for pulling out.
　外郭ケース３０の下部には支持脚３５が接続されている。例えば、各支持脚３５をコンクリート製の土台９０にアンカーボルト（図示省略）で固定することにより、貯湯タンクユニット４０が土台９０に据え付けられている。なお、上記の配管接続部と、配管接続部に接続された各配管とを覆い隠して貯湯タンクユニット４０の意匠性を向上させるために、外郭ケース３０の下方には配管カバー（図示省略）が設けられる。 A support leg 35 is connected to the lower part of the outer case 30. For example, the hot water storage tank unit 40 is installed on the base 90 by fixing each support leg 35 to the concrete base 90 with anchor bolts (not shown). In order to improve the design of the hot water storage tank unit 40 by covering the above-mentioned pipe connection portion and each pipe connected to the pipe connection portion, a pipe cover (not shown) is provided below the outer case 30. Provided.
　貯湯式給湯機５０が使用されるときには、以下のようになる。貯湯タンク１０内は、上側が高温の湯になり、下側が低温の水になる。上層の高温湯と、下層の低温水とは、比重差により、混じり合うことなく維持される。給水配管１１からの給水により、貯湯タンク１０内は、上層の高温湯と下層の低温水とで常時満水状態に保たれる。また、給水配管１１からの送水圧が貯湯タンク１０内に常時作用する。 When the hot water storage type water heater 50 is used, it becomes as follows. In the hot water storage tank 10, the upper side becomes hot water and the lower side becomes cold water. The hot water in the upper layer and the cold water in the lower layer are maintained without being mixed due to the difference in specific gravity. By supplying water from the water supply pipe 11, the inside of the hot water storage tank 10 is always kept full with the high temperature water in the upper layer and the low temperature water in the lower layer. Further, the water supply pressure from the water supply pipe 11 always acts in the hot water storage tank 10.
　ヒートポンプユニット１により加熱された湯を貯湯タンク１０内に蓄積する蓄熱運転のときには、以下のようになる。貯湯タンク１０内の下部にある低温水がヒートポンプ往き配管１３ａを通ってヒートポンプユニット１内の水－冷媒熱交換器に送られる。水－冷媒熱交換器にて加熱された後の高温の湯は、ヒートポンプ戻り配管１３ｂを通り、貯湯タンク１０の上部から貯湯タンク１０内に流入する。 During the heat storage operation in which the hot water heated by the heat pump unit 1 is stored in the hot water storage tank 10, the result is as follows. The low-temperature water in the lower part of the hot water storage tank 10 is sent to the water-refrigerant heat exchanger in the heat pump unit 1 through the heat pump going pipe 13a. The hot water after being heated by the water-refrigerant heat exchanger passes through the heat pump return pipe 13b and flows into the hot water storage tank 10 from the upper part of the hot water storage tank 10.
　タンク上部配管１６は、貯湯タンク１０の上部と混合弁１５との間を接続している。給湯時には、給水配管１１からの送水圧により、貯湯タンク１０内の高温の湯がタンク上部配管１６を通って混合弁１５に流入する。混合弁１５は、タンク上部配管１６からの高温湯と、給水配管１１からの低温水との混合比を調整することにより、使用者がリモコン（図示省略）等で設定した温度の湯を生成する。混合弁１５により混合された湯は、給湯配管１２あるいは風呂往き配管１４を通って、給湯栓あるいは浴槽に供給される。 The tank upper pipe 16 connects the upper part of the hot water storage tank 10 and the mixing valve 15. At the time of hot water supply, the high temperature hot water in the hot water storage tank 10 flows into the mixing valve 15 through the tank upper pipe 16 due to the water supply pressure from the water supply pipe 11. The mixing valve 15 generates hot water at a temperature set by the user with a remote controller (not shown) or the like by adjusting the mixing ratio of the hot water from the tank upper pipe 16 and the low temperature water from the water supply pipe 11. .. The hot water mixed by the mixing valve 15 is supplied to the hot water tap or the bathtub through the hot water supply pipe 12 or the bath going pipe 14.
　外郭ケース３０の内部には、上述した機器以外の、例えば配管、バルブ、ポンプ、熱交換器、センサ、制御装置などの機器がさらに備えられていてもよいが、本開示ではそれらについての図示及び詳細な説明を省略する。 Equipment other than the above-mentioned equipment, such as piping, valves, pumps, heat exchangers, sensors, and control devices, may be further provided inside the outer case 30, but in the present disclosure, they may be further illustrated and illustrated. Detailed description will be omitted.
　図２は、図１に示す貯湯式給湯機５０が備える貯湯タンク１０と、貯湯タンク１０を覆う断熱材とを示す縦断面図である。図３は、図１に示す貯湯式給湯機５０が備える貯湯タンクユニット４０を示す断面平面図である。貯湯タンク１０の中心軸を以下「タンク中心軸」と称する。貯湯式給湯機５０は、タンク中心軸が鉛直線に対して実質的に平行となる姿勢で設置される。以下の説明では、そのような貯湯式給湯機５０の使用時の姿勢を基準として、位置関係が特定される。 FIG. 2 is a vertical cross-sectional view showing a hot water storage tank 10 included in the hot water storage type water heater 50 shown in FIG. 1 and a heat insulating material covering the hot water storage tank 10. FIG. 3 is a cross-sectional plan view showing a hot water storage tank unit 40 included in the hot water storage type water heater 50 shown in FIG. The central axis of the hot water storage tank 10 is hereinafter referred to as "tank central axis". The hot water storage type water heater 50 is installed in a posture in which the central axis of the tank is substantially parallel to the vertical line. In the following description, the positional relationship is specified with reference to the posture when the hot water storage type water heater 50 is used.
　図３は、タンク中心軸に対して垂直な平面で切断した断面図に相当する。図３中の下側が貯湯タンクユニット４０の前面に相当し、図３中の上側が貯湯タンクユニット４０の後面に相当する。図２は、タンク中心軸を含む平面で切断した断面図であるとともに、図３中のII－II線で貯湯タンク１０及び断熱材を切断した断面図に相当する。図３では、貯湯タンク１０、断熱材、及び外郭ケース３０以外の機器の図示は省略されている。 FIG. 3 corresponds to a cross-sectional view cut in a plane perpendicular to the central axis of the tank. The lower side in FIG. 3 corresponds to the front surface of the hot water storage tank unit 40, and the upper side in FIG. 3 corresponds to the rear surface of the hot water storage tank unit 40. FIG. 2 is a cross-sectional view cut along a plane including the central axis of the tank, and corresponds to a cross-sectional view of the hot water storage tank 10 and the heat insulating material cut along the line II-II in FIG. In FIG. 3, equipment other than the hot water storage tank 10, the heat insulating material, and the outer case 30 is not shown.
　貯湯タンク１０は、例えば、ステンレス鋼のような金属材料で作られている。図２に示すように、貯湯タンク１０は、円筒状のタンク胴部１０ａと、タンク胴部１０ａの上部開口を塞ぐ上鏡板１０ｂと、タンク胴部１０ａの下部開口を塞ぐ下鏡板１０ｃとを有する。上鏡板１０ｂは、半球状、または逆さまの椀状の形状を有する。下鏡板１０ｃは、半球状または椀状の形状を有する。 The hot water storage tank 10 is made of a metal material such as stainless steel. As shown in FIG. 2, the hot water storage tank 10 has a cylindrical tank body 10a, an upper end plate 10b that closes the upper opening of the tank body 10a, and a lower end plate 10c that closes the lower opening of the tank body 10a. .. The upper end plate 10b has a hemispherical or upside-down bowl-shaped shape. The lower end plate 10c has a hemispherical or bowl-shaped shape.
　本実施の形態の貯湯式給湯機５０は、貯湯タンク１０を覆う断熱材として、上部断熱材６０、前面断熱材６１、後面断熱材６２、及び下部断熱材６３を備える。これらの断熱材のそれぞれは、発泡ポリウレタン断熱材に相当している。発泡ポリウレタン断熱材は、金型（図示省略）を用いて発泡ポリウレタンを成形してなるものである。発泡ポリウレタン断熱材は、硬質ウレタンフォームに相当するものでもよい。 The hot water storage type water heater 50 of the present embodiment includes an upper heat insulating material 60, a front heat insulating material 61, a rear heat insulating material 62, and a lower heat insulating material 63 as heat insulating materials for covering the hot water storage tank 10. Each of these insulations corresponds to a polyurethane foam insulation. The polyurethane foam heat insulating material is formed by molding polyurethane foam using a mold (not shown). The polyurethane foam heat insulating material may correspond to a rigid urethane foam.
　上部断熱材６０は、上鏡板１０ｂの表面を少なくとも部分的に覆う。前面断熱材６１及び後面断熱材６２は、タンク胴部１０ａの表面を少なくとも部分的に覆う。図示の例では、前面断熱材６１は、タンク胴部１０ａの表面のうち、前面側に当たる半分の領域を覆う。後面断熱材６２は、タンク胴部１０ａの表面のうち、後面側に当たる半分の領域を覆う。下部断熱材６３は、下鏡板１０ｃの表面を少なくとも部分的に覆う。 The upper heat insulating material 60 covers the surface of the upper end plate 10b at least partially. The front insulation 61 and the rear insulation 62 cover the surface of the tank body 10a at least partially. In the illustrated example, the front heat insulating material 61 covers a half region of the surface of the tank body 10a that corresponds to the front side. The rear heat insulating material 62 covers a half region of the surface of the tank body 10a, which is on the rear side. The lower insulation 63 covers the surface of the lower end plate 10c at least partially.
　発泡ポリウレタン断熱材は、一つ一つが独立した微細なセルの中に、熱伝導率の低い気体が閉じ込められた構造を有しており、断熱性能に優れている。発泡ポリウレタン断熱材は、例えば、ポリオール及びポリイソシアネートをそれぞれ主成分とする２つの原液を発泡機で混合したウレタン原液を、金型内に液状で注入し、発泡及び硬化させることで作られる。 The foamed polyurethane heat insulating material has a structure in which a gas having low thermal conductivity is confined in a fine cell in which each is independent, and has excellent heat insulating performance. The foamed polyurethane heat insulating material is made, for example, by injecting a urethane stock solution, which is a mixture of two stock solutions containing polyol and polyisocyanate as main components in a foaming machine, into a mold in a liquid state, foaming and curing.
　ウレタン原液の注入方式については、金型を閉じた後、特定の注入口からウレタン原液を注入するクローズド注入方式と、金型を開いた状態でウレタン原液を注入するオープン注入方式とがある。以下の説明では、主として、クローズド注入方式で作られた発泡ポリウレタン断熱材を例に説明する。 There are two methods for injecting urethane stock solution: a closed injection method in which the urethane stock solution is injected from a specific injection port after the mold is closed, and an open injection method in which the urethane stock solution is injected with the mold open. In the following description, a polyurethane foam heat insulating material made by a closed injection method will be mainly described as an example.
　本開示による発泡ポリウレタン断熱材は、低密度部と、少なくとも一つの高密度部とを有している。高密度部は、低密度部よりも高い密度を有している。本開示では、発泡ポリウレタン断熱材についての密度とは、見かけ密度を意味するものとする。見かけ密度は、物質自身が占める体積と、内部空隙の体積との合計を密度算定用の体積として計算した密度である。 The foamed polyurethane heat insulating material according to the present disclosure has a low density portion and at least one high density portion. The high density portion has a higher density than the low density portion. In the present disclosure, the density of the polyurethane foam insulation means the apparent density. The apparent density is a density calculated by calculating the sum of the volume occupied by the substance itself and the volume of the internal voids as the volume for density calculation.
　高密度部は、低密度部よりも高い断熱性を有している。すなわち、高密度部の熱伝導率は、低密度部の熱伝導率よりも低い。また、高密度部は、低密度部よりも高い機械的強度を有している。機械的強度は、材料が持つ、変形あるいは破壊に対する抵抗力である。機械的強度は、例えば、引っ張り強さ、圧縮強さ、せん断強さのうちの少なくとも一つによって表すことができる。 The high-density part has higher heat insulation than the low-density part. That is, the thermal conductivity of the high-density portion is lower than the thermal conductivity of the low-density portion. Further, the high-density portion has higher mechanical strength than the low-density portion. Mechanical strength is the resistance of a material to deformation or fracture. Mechanical strength can be expressed, for example, by at least one of tensile strength, compressive strength, and shear strength.
　金型の内部には、発泡ポリウレタン断熱材の形状に対応した形状の空間（以下、「金型空間」と称する）が形成されている。以下の説明では、発泡ポリウレタン断熱材の成形時に金型空間へのウレタン原液の入口となった部分を「原料入口部」と称する。クローズド注入方式によって発泡ポリウレタン断熱材を製造すると、原料入口部から遠い領域においては密度が低くなり、原料入口部に近い領域においては密度が高くなるという傾向がある。このことを利用することで、発泡ポリウレタン断熱材内において、高密度部が形成される領域と、低密度部が形成される領域とをコントロールすることができる。図２及び図３中の太くて短い複数の矢印は、それぞれの発泡ポリウレタン断熱材の原料入口部の位置を指し示している。 Inside the mold, a space having a shape corresponding to the shape of the polyurethane foam heat insulating material (hereinafter referred to as "mold space") is formed. In the following description, the portion that becomes the inlet of the urethane stock solution into the mold space during molding of the foamed polyurethane heat insulating material is referred to as a “raw material inlet portion”. When the foamed polyurethane heat insulating material is manufactured by the closed injection method, the density tends to be low in the region far from the raw material inlet portion and high in the region close to the raw material inlet portion. By utilizing this, it is possible to control the region where the high-density portion is formed and the region where the low-density portion is formed in the foamed polyurethane heat insulating material. The thick and short arrows in FIGS. 2 and 3 point to the positions of the raw material inlets of the respective polyurethane foam insulation materials.
　前面断熱材６１は、貯湯式給湯機５０の構成部品（図示省略）を支持する支持部６１ａを有している。当該構成部品は、例えば、配管、バルブ、ポンプ、熱交換器、センサ、制御装置のうちの少なくとも一つでもよい。当該構成部品は、例えば、ネジ、粘着テープ、スナップフィット、凹凸嵌合のうちの少なくとも一つを用いて支持部６１ａに対して固定されていてもよい。支持部６１ａは、当該構成部品の重量の少なくとも一部を支持する。図示の例では、支持部６１ａは、前面断熱材６１の表面である外周面６１ｂから外側へ向かって突出している。 The front heat insulating material 61 has a support portion 61a that supports components (not shown) of the hot water storage type water heater 50. The component may be, for example, at least one of a pipe, a valve, a pump, a heat exchanger, a sensor, and a control device. The component may be fixed to the support 61a using, for example, at least one of a screw, an adhesive tape, a snap fit, and an uneven fit. The support portion 61a supports at least a part of the weight of the component. In the illustrated example, the support portion 61a projects outward from the outer peripheral surface 61b, which is the surface of the front heat insulating material 61.
　図２に示すように、前面断熱材６１は、低密度部６１ｃを有している。支持部６１ａは、低密度部６１ｃよりも高い密度を有する高密度部に相当している。支持部６１ａには、構成部品の重量が作用する。このため、支持部６１ａの機械的強度が低いと、長期間の使用中に、支持部６１ａが変形し、構成部品を適正位置に保持できなくなる可能性がある。これとは対照的に、本実施の形態であれば、支持部６１ａが高密度部に相当することで、支持部６１ａの機械的強度を高くする上で有利になる。それゆえ、長期間の使用中に、支持部６１ａの変形を確実に防止できるので、支持部６１ａを含む前面断熱材６１の耐久性を向上する上で有利になる。 As shown in FIG. 2, the front heat insulating material 61 has a low density portion 61c. The support portion 61a corresponds to a high-density portion having a higher density than the low-density portion 61c. The weight of the component acts on the support portion 61a. Therefore, if the mechanical strength of the support portion 61a is low, the support portion 61a may be deformed during long-term use, and the component parts may not be held in an appropriate position. In contrast, in the present embodiment, the support portion 61a corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the support portion 61a. Therefore, since the deformation of the support portion 61a can be reliably prevented during long-term use, it is advantageous in improving the durability of the front heat insulating material 61 including the support portion 61a.
　前面断熱材６１は、原料入口部６１ｄを有している。支持部６１ａは、原料入口部６１ｄに近い位置にある。低密度部６１ｃは、支持部６１ａに比べて、原料入口部６１ｄから遠い位置にある。図示の例では、原料入口部６１ｄは、支持部６１ａの一部に相当している。これにより、支持部６１ａの密度をより高くする上で有利になるので、支持部６１ａの機械的強度を向上する上でより有利になる。図示の例では、鉛直方向の位置に関して、支持部６１ａ及び原料入口部６１ｄは、低密度部６１ｃよりも高い位置にある。 The front heat insulating material 61 has a raw material inlet portion 61d. The support portion 61a is located near the raw material inlet portion 61d. The low density portion 61c is located farther from the raw material inlet portion 61d than the support portion 61a. In the illustrated example, the raw material inlet portion 61d corresponds to a part of the support portion 61a. This is advantageous in increasing the density of the support portion 61a, which is more advantageous in improving the mechanical strength of the support portion 61a. In the illustrated example, the support portion 61a and the raw material inlet portion 61d are located higher than the low density portion 61c with respect to the vertical position.
　上部断熱材６０は、内壁部６０ａと外壁部６０ｂとを有している。内壁部６０ａは、上鏡板１０ｂの表面に接する内面６０ｃを有している。図示の例では、内面６０ｃは、上鏡板１０ｂの表面の凸曲面に対応した形状の凹曲面になっている。外壁部６０ｂは、内面６０ｃとは反対側を向く面である外面６０ｄを有している。外壁部６０ｂは、内壁部６０ａの外側に位置している。外壁部６０ｂは、貯湯タンク１０の表面に接しない。外壁部６０ｂは、内壁部６０ａと比べて、貯湯タンク１０の表面から遠い位置にある。 The upper heat insulating material 60 has an inner wall portion 60a and an outer wall portion 60b. The inner wall portion 60a has an inner surface 60c in contact with the surface of the upper end plate 10b. In the illustrated example, the inner surface 60c is a concave curved surface having a shape corresponding to the convex curved surface of the surface of the upper end plate 10b. The outer wall portion 60b has an outer surface 60d which is a surface facing the side opposite to the inner surface 60c. The outer wall portion 60b is located outside the inner wall portion 60a. The outer wall portion 60b does not come into contact with the surface of the hot water storage tank 10. The outer wall portion 60b is located farther from the surface of the hot water storage tank 10 than the inner wall portion 60a.
　外壁部６０ｂは、低密度部に相当している。内壁部６０ａは、外壁部６０ｂよりも高い密度を有する高密度部に相当している。内壁部６０ａは、高温になる貯湯タンク１０の表面に接するので、外壁部６０ｂよりも高温にさらされる。その結果、内壁部６０ａは、外壁部６０ｂよりも熱劣化しやすい。このため、内壁部６０ａの機械的強度が低いと、長期間の使用中に、内壁部６０ａのセルの壁が壊れることでセル内の気体を閉じ込められなくなり、内壁部６０ａの断熱性能が低下する可能性がある。これとは対照的に、本実施の形態であれば、内壁部６０ａが高密度部に相当することで、内壁部６０ａの機械的強度を高くする上で有利になる。それゆえ、長期間の使用中に内壁部６０ａの上記のような損傷を確実に防止でき、内壁部６０ａを含む上部断熱材６０の耐久性を向上する上で有利になる。 The outer wall portion 60b corresponds to the low density portion. The inner wall portion 60a corresponds to a high-density portion having a higher density than the outer wall portion 60b. Since the inner wall portion 60a is in contact with the surface of the hot water storage tank 10 which becomes hot, it is exposed to a higher temperature than the outer wall portion 60b. As a result, the inner wall portion 60a is more likely to be thermally deteriorated than the outer wall portion 60b. Therefore, if the mechanical strength of the inner wall portion 60a is low, the gas inside the cell cannot be trapped due to the breakage of the cell wall of the inner wall portion 60a during long-term use, and the heat insulating performance of the inner wall portion 60a deteriorates. there is a possibility. In contrast, in the present embodiment, the inner wall portion 60a corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the inner wall portion 60a. Therefore, the above-mentioned damage to the inner wall portion 60a can be reliably prevented during long-term use, which is advantageous in improving the durability of the upper heat insulating material 60 including the inner wall portion 60a.
　上部断熱材６０は、原料入口部６０ｅを有している。内壁部６０ａは、原料入口部６０ｅに近い位置にある。外壁部６０ｂは、内壁部６０ａに比べて、原料入口部６０ｅから遠い位置にある。図示の例では、原料入口部６０ｅは、内壁部６０ａの一部に相当している。これにより、内壁部６０ａの密度をより高くする上で有利になるので、内壁部６０ａの機械的強度を向上する上でより有利になる。 The upper heat insulating material 60 has a raw material inlet portion 60e. The inner wall portion 60a is located near the raw material inlet portion 60e. The outer wall portion 60b is located farther from the raw material inlet portion 60e than the inner wall portion 60a. In the illustrated example, the raw material inlet portion 60e corresponds to a part of the inner wall portion 60a. This is advantageous in increasing the density of the inner wall portion 60a, and is more advantageous in improving the mechanical strength of the inner wall portion 60a.
　下部断熱材６３は、内壁部６３ａと外壁部６３ｂとを有している。内壁部６３ａは、下鏡板１０ｃの表面に接する内面６３ｃを有している。図示の例では、内面６３ｃは、下鏡板１０ｃの表面の凸曲面に対応した形状の凹曲面になっている。外壁部６３ｂは、内面６３ｃとは反対側を向く面である外面６３ｄを有している。外壁部６３ｂは、内壁部６３ａの外側に位置している。外壁部６３ｂは、貯湯タンク１０の表面に接しない。外壁部６３ｂは、内壁部６３ａと比べて、貯湯タンク１０の表面から遠い位置にある。 The lower heat insulating material 63 has an inner wall portion 63a and an outer wall portion 63b. The inner wall portion 63a has an inner surface 63c in contact with the surface of the lower end plate 10c. In the illustrated example, the inner surface 63c is a concave curved surface having a shape corresponding to the convex curved surface of the surface of the lower end plate 10c. The outer wall portion 63b has an outer surface 63d which is a surface facing the side opposite to the inner surface 63c. The outer wall portion 63b is located outside the inner wall portion 63a. The outer wall portion 63b does not come into contact with the surface of the hot water storage tank 10. The outer wall portion 63b is located farther from the surface of the hot water storage tank 10 than the inner wall portion 63a.
　外壁部６３ｂは、低密度部に相当している。内壁部６３ａは、外壁部６３ｂよりも高い密度を有する高密度部に相当している。高温の湯が貯湯タンク１０に満杯になると、下鏡板１０ｃの表面も高温になる。その際、内壁部６３ａは、高温になった下鏡板１０ｃの表面に接するので、外壁部６３ｂよりも高温にさらされる。その結果、内壁部６３ａは、外壁部６３ｂよりも熱劣化しやすい。このため、内壁部６３ａの機械的強度が低いと、長期間の使用中に、内壁部６３ａのセルの壁が壊れることでセル内の気体を閉じ込められなくなり、内壁部６３ａの断熱性能が低下する可能性がある。これとは対照的に、本実施の形態であれば、内壁部６３ａが高密度部に相当することで、内壁部６３ａの機械的強度を高くする上で有利になる。それゆえ、長期間の使用中に内壁部６３ａの上記のような損傷を確実に防止でき、内壁部６３ａを含む下部断熱材６３の耐久性を向上する上で有利になる。 The outer wall portion 63b corresponds to the low density portion. The inner wall portion 63a corresponds to a high-density portion having a higher density than the outer wall portion 63b. When the hot water storage tank 10 is filled with hot water, the surface of the lower end plate 10c also becomes hot. At that time, since the inner wall portion 63a is in contact with the surface of the lower end plate 10c which has become hot, it is exposed to a higher temperature than the outer wall portion 63b. As a result, the inner wall portion 63a is more likely to be thermally deteriorated than the outer wall portion 63b. Therefore, if the mechanical strength of the inner wall portion 63a is low, the gas inside the cell cannot be trapped due to the breakage of the cell wall of the inner wall portion 63a during long-term use, and the heat insulating performance of the inner wall portion 63a deteriorates. there is a possibility. In contrast, in the present embodiment, the inner wall portion 63a corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the inner wall portion 63a. Therefore, the above-mentioned damage to the inner wall portion 63a can be reliably prevented during long-term use, which is advantageous in improving the durability of the lower heat insulating material 63 including the inner wall portion 63a.
　下部断熱材６３は、原料入口部６３ｅを有している。内壁部６３ａは、原料入口部６３ｅに近い位置にある。外壁部６３ｂは、内壁部６３ａに比べて、原料入口部６３ｅから遠い位置にある。図示の例では、原料入口部６３ｅは、内壁部６３ａの一部に相当している。これにより、内壁部６３ａの密度をより高くする上で有利になるので、内壁部６３ａの機械的強度を向上する上でより有利になる。 The lower heat insulating material 63 has a raw material inlet portion 63e. The inner wall portion 63a is located near the raw material inlet portion 63e. The outer wall portion 63b is located farther from the raw material inlet portion 63e than the inner wall portion 63a. In the illustrated example, the raw material inlet portion 63e corresponds to a part of the inner wall portion 63a. This is advantageous in increasing the density of the inner wall portion 63a, and is more advantageous in improving the mechanical strength of the inner wall portion 63a.
　後面断熱材６２は、他の断熱材である上部断熱材６０に対して嵌合する嵌合部６２ａと、低密度部６２ｂとを有している。嵌合部６２ａは、低密度部６２ｂよりも高い密度を有する高密度部に相当している。嵌合部６２ａの機械的強度が低いと、長期間の使用中に、嵌合部６２ａが変形して、上部断熱材６０との間に隙間が生じる可能性がある。隙間が生じることは、熱漏洩につながるため、好ましくない。これとは対照的に、本実施の形態であれば、嵌合部６２ａが高密度部に相当することで、嵌合部６２ａの機械的強度を高くする上で有利になる。それゆえ、長期間の使用中に嵌合部６２ａの変形を確実に防止できる。このため、上部断熱材６０との間に隙間が生じることを確実に防止できるので、熱漏洩を確実に防止できる。 The rear surface heat insulating material 62 has a fitting portion 62a that fits into the upper heat insulating material 60, which is another heat insulating material, and a low density portion 62b. The fitting portion 62a corresponds to a high-density portion having a higher density than the low-density portion 62b. If the mechanical strength of the fitting portion 62a is low, the fitting portion 62a may be deformed during long-term use, and a gap may be formed between the fitting portion 62a and the upper heat insulating material 60. The formation of gaps is not preferable because it leads to heat leakage. In contrast, in the present embodiment, the fitting portion 62a corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the fitting portion 62a. Therefore, deformation of the fitting portion 62a can be reliably prevented during long-term use. Therefore, it is possible to reliably prevent a gap from being formed between the upper heat insulating material 60 and the upper heat insulating material 60, so that heat leakage can be reliably prevented.
　後面断熱材６２は、原料入口部６２ｃを有している。嵌合部６２ａは、原料入口部６２ｃに近い位置にある。低密度部６２ｂは、嵌合部６２ａに比べて、原料入口部６２ｃから遠い位置にある。図示の例では、鉛直方向の位置に関して、嵌合部６２ａ及び原料入口部６２ｃは、低密度部６２ｂよりも高い位置にある。 The rear heat insulating material 62 has a raw material inlet portion 62c. The fitting portion 62a is located near the raw material inlet portion 62c. The low density portion 62b is located farther from the raw material inlet portion 62c than the fitting portion 62a. In the illustrated example, the fitting portion 62a and the raw material inlet portion 62c are located higher than the low density portion 62b with respect to the vertical position.
　前面断熱材６１は、他の断熱材である上部断熱材６０に対して嵌合する嵌合部６１ｅと、低密度部６１ｆとを有している。嵌合部６１ｅは、低密度部６１ｆよりも高い密度を有する高密度部に相当している。嵌合部６１ｅの機械的強度が低いと、長期間の使用中に、嵌合部６１ｅが変形して、上部断熱材６０との間に隙間が生じる可能性がある。隙間が生じることは、熱漏洩につながるため、好ましくない。これとは対照的に、本実施の形態であれば、嵌合部６１ｅが高密度部に相当することで、嵌合部６１ｅの機械的強度を高くする上で有利になる。それゆえ、長期間の使用中に嵌合部６１ｅの変形を確実に防止できる。このため、上部断熱材６０との間に隙間が生じることを確実に防止できるので、熱漏洩を確実に防止できる。 The front heat insulating material 61 has a fitting portion 61e that fits into the upper heat insulating material 60, which is another heat insulating material, and a low density portion 61f. The fitting portion 61e corresponds to a high-density portion having a higher density than the low-density portion 61f. If the mechanical strength of the fitting portion 61e is low, the fitting portion 61e may be deformed during long-term use, and a gap may be formed between the fitting portion 61e and the upper heat insulating material 60. The formation of gaps is not preferable because it leads to heat leakage. In contrast, in the present embodiment, the fitting portion 61e corresponds to the high-density portion, which is advantageous in increasing the mechanical strength of the fitting portion 61e. Therefore, deformation of the fitting portion 61e can be reliably prevented during long-term use. Therefore, it is possible to reliably prevent a gap from being formed between the upper heat insulating material 60 and the upper heat insulating material 60, so that heat leakage can be reliably prevented.
　前面断熱材６１は、原料入口部６１ｇを有している。嵌合部６１ｅは、原料入口部６１ｇに近い位置にある。低密度部６１ｆは、嵌合部６１ｅに比べて、原料入口部６１ｇから遠い位置にある。図示の例では、鉛直方向の位置に関して、以下のようになっている。嵌合部６１ｅ及び原料入口部６１ｇは、低密度部６１ｆよりも高い位置にある。低密度部６１ｆは、支持部６１ａ及び原料入口部６１ｄよりも高い位置にある。 The front heat insulating material 61 has a raw material inlet portion of 61 g. The fitting portion 61e is located near the raw material inlet portion 61g. The low density portion 61f is located farther from the raw material inlet portion 61g than the fitting portion 61e. In the illustrated example, the positions in the vertical direction are as follows. The fitting portion 61e and the raw material inlet portion 61g are located higher than the low density portion 61f. The low density portion 61f is located higher than the support portion 61a and the raw material inlet portion 61d.
　図示の例では、嵌合部６１ｅ及び嵌合部６２ａのそれぞれは、上に向かって突出している。嵌合部６１ｅ及び嵌合部６２ａのそれぞれは、タンク胴部１０ａの表面から離れた位置で、タンク胴部１０ａの周方向に沿って円弧状をなしている。嵌合部６１ｅの両端が嵌合部６２ａの両端につながることで、環状突出部が形成される。上部断熱材６０は、嵌合部６０ｆを有している。嵌合部６０ｆは、下に向かって突出する突出部である。嵌合部６０ｆは、タンク胴部１０ａまたは上鏡板１０ｂの外周面に沿って環状に形成されている。嵌合部６１ｅ及び嵌合部６２ａにより形成される環状突出部の内周側に嵌合部６０ｆが嵌合している。 In the illustrated example, each of the fitting portion 61e and the fitting portion 62a protrudes upward. Each of the fitting portion 61e and the fitting portion 62a forms an arc shape along the circumferential direction of the tank body portion 10a at a position away from the surface of the tank body portion 10a. An annular protrusion is formed by connecting both ends of the fitting portion 61e to both ends of the fitting portion 62a. The upper heat insulating material 60 has a fitting portion 60f. The fitting portion 60f is a protruding portion that protrudes downward. The fitting portion 60f is formed in an annular shape along the outer peripheral surface of the tank body portion 10a or the upper end plate 10b. The fitting portion 60f is fitted on the inner peripheral side of the annular projecting portion formed by the fitting portion 61e and the fitting portion 62a.
　前面断熱材６１は、互いに異なる位置に設けられた複数の高密度部に相当する支持部６１ａ及び嵌合部６１ｅを有している。このように、単一の発泡ポリウレタン断熱材のうちの異なる位置に、複数の高密度部を設けてもよい。これにより、発泡ポリウレタン断熱材の耐久性を向上する上でより有利になる。 The front heat insulating material 61 has a support portion 61a and a fitting portion 61e corresponding to a plurality of high-density portions provided at different positions from each other. As described above, a plurality of high-density portions may be provided at different positions in the single polyurethane foam heat insulating material. This is more advantageous in improving the durability of the foamed polyurethane heat insulating material.
　前面断熱材６１は、互いに位置が異なる複数の原料入口部６１ｄ及び原料入口部６１ｇを有している。すなわち、前面断熱材６１を成形する金型には、金型空間へのウレタン原液の入口が複数の位置に設けられている。このように、一つの金型空間に対してウレタン原液の入口を複数設けてもよい。そのようにすることで、単一の発泡ポリウレタン断熱材のうちの異なる位置に複数の高密度部を設けることができる。 The front heat insulating material 61 has a plurality of raw material inlets 61d and raw material inlets 61g that are located at different positions from each other. That is, the mold for molding the front heat insulating material 61 is provided with inlets of the urethane stock solution into the mold space at a plurality of positions. In this way, a plurality of urethane stock solution inlets may be provided in one mold space. By doing so, a plurality of high-density portions can be provided at different positions in the single polyurethane foam insulation material.
　支持部６１ａ及び嵌合部６１ｅは、鉛直方向の位置に関して、低密度部６１ｃよりも高い位置にある高所部に相当している。また、嵌合部６２ａは、鉛直方向の位置に関して、低密度部６２ｂよりも高い位置にある高所部に相当している。本実施の形態であれば、このような高所部を備えたことで、以下の効果が得られる。貯湯タンク１０内の湯の温度は、上方の位置ほど高くなる。断熱性能の高い高密度部に相当する支持部６１ａ、嵌合部６１ｅ、及び嵌合部６２ａが高い位置に配置されているので、貯湯タンク１０のうちの高温領域の断熱性をさらに向上できる。低密度部６１ｃ及び低密度部６２ｂが配置された領域は、貯湯タンク１０内の湯の温度が比較的低いので、低密度部６１ｃ及び低密度部６２ｂの断熱性能でも十分である。 The support portion 61a and the fitting portion 61e correspond to a high place portion located higher than the low density portion 61c with respect to the position in the vertical direction. Further, the fitting portion 62a corresponds to a high place portion located at a position higher than the low density portion 62b with respect to the position in the vertical direction. In the present embodiment, the following effects can be obtained by providing such a high place. The temperature of the hot water in the hot water storage tank 10 becomes higher as the position is higher. Since the support portion 61a, the fitting portion 61e, and the fitting portion 62a corresponding to the high-density portion having high heat insulation performance are arranged at high positions, the heat insulation property of the high temperature region of the hot water storage tank 10 can be further improved. In the region where the low-density portion 61c and the low-density portion 62b are arranged, the temperature of the hot water in the hot water storage tank 10 is relatively low, so that the heat insulating performance of the low-density portion 61c and the low-density portion 62b is sufficient.
　貯湯式給湯機５０は、発泡ポリウレタン断熱材よりも高い熱伝導率を有する低所断熱材を備えていてもよい。例えば、下部断熱材６３を発泡ポリウレタン製ではなく発泡ポリスチレン製にしてもよい。この場合、下部断熱材６３は、鉛直方向の位置に関して、発泡ポリウレタン断熱材である上部断熱材６０、前面断熱材６１、及び後面断熱材６２よりも低い位置で貯湯タンク１０を覆う低所断熱材に相当する。この低所断熱材が配置された領域は、貯湯タンク１０内の湯の温度が比較的低いので、発泡ポリウレタン断熱材よりも熱伝導率が高い低所断熱材でも、十分な断熱性能が得られる。発泡ポリウレタン断熱材よりも熱伝導率が高い低所断熱材を用いることで、コストを低減できる。 The hot water storage type water heater 50 may be provided with a low-place heat insulating material having a higher thermal conductivity than the foamed polyurethane heat insulating material. For example, the lower heat insulating material 63 may be made of expanded polystyrene instead of made of expanded polyurethane. In this case, the lower heat insulating material 63 is a low-place heat insulating material that covers the hot water storage tank 10 at a position lower than the upper heat insulating material 60, the front heat insulating material 61, and the rear heat insulating material 62, which are polyurethane foam heat insulating materials, in the vertical position. Corresponds to. Since the temperature of the hot water in the hot water storage tank 10 is relatively low in the region where the low-place heat insulating material is arranged, sufficient heat insulating performance can be obtained even with the low-place heat insulating material having a higher thermal conductivity than the foamed polyurethane heat insulating material. .. Cost can be reduced by using a low-place heat insulating material having a higher thermal conductivity than the polyurethane foam heat insulating material.
　以下の説明において、断熱材の厚さ寸法とは、貯湯タンク１０の半径方向に沿う方向の寸法であるものとする。すなわち、厚さ寸法は、タンク中心軸と直交する直線に沿って測った断熱材の厚さである。また、貯湯タンク１０の表面であるタンク表面と、外郭ケース３０の内壁３０ａとの間の距離を、タンク表面の法線に沿って測った距離を「対向距離」と称する。対向距離の小さい領域では、断熱材の厚さ寸法を大きくすることが困難である。 In the following description, the thickness dimension of the heat insulating material shall be the dimension in the radial direction of the hot water storage tank 10. That is, the thickness dimension is the thickness of the heat insulating material measured along a straight line orthogonal to the central axis of the tank. Further, the distance between the tank surface, which is the surface of the hot water storage tank 10, and the inner wall 30a of the outer case 30, measured along the normal line of the tank surface is referred to as "opposing distance". In a region where the facing distance is small, it is difficult to increase the thickness dimension of the heat insulating material.
　図３に示すように、前面断熱材６１は、薄肉部６１ｈと、薄肉部６１ｉと、低密度部６１ｊとを有している。薄肉部６１ｈは、低密度部６１ｊの位置の対向距離Ｄ１よりも小さい対向距離Ｄ２の位置に配置されている。薄肉部６１ｉは、低密度部６１ｊの位置の対向距離Ｄ１よりも小さい対向距離Ｄ３の位置に配置されている。薄肉部６１ｈ，６１ｉのそれぞれの厚さ寸法は、低密度部６１ｊの厚さ寸法よりも小さい。薄肉部６１ｈ，６１ｉのそれぞれは、低密度部６１ｊよりも高い密度を有する高密度部に相当している。 As shown in FIG. 3, the front heat insulating material 61 has a thin-walled portion 61h, a thin-walled portion 61i, and a low-density portion 61j. The thin-walled portion 61h is arranged at a position where the facing distance D2 is smaller than the facing distance D1 at the position of the low-density portion 61j. The thin-walled portion 61i is arranged at a position where the facing distance D3 is smaller than the facing distance D1 at the position of the low-density portion 61j. The thickness dimensions of the thin portion 61h and 61i are smaller than the thickness dimensions of the low density portion 61j. Each of the thin-walled portions 61h and 61i corresponds to a high-density portion having a higher density than the low-density portion 61j.
　薄肉部６１ｈ，６１ｉは厚さ寸法が低密度部６１ｊよりも小さいので、薄肉部６１ｈ，６１ｉの機械的強度が低いと、長期間の使用中に、薄肉部６１ｈ，６１ｉが変形する可能性がある。これとは対照的に、本実施の形態であれば、薄肉部６１ｈ，６１ｉが高密度部に相当することで、薄肉部６１ｈ，６１ｉの機械的強度を高くする上で有利になる。それゆえ、長期間の使用中に薄肉部６１ｈ，６１ｉの変形を確実に防止でき、薄肉部６１ｈ，６１ｉの耐久性を向上する上で有利になる。 Since the thickness of the thin parts 61h and 61i is smaller than that of the low density part 61j, if the mechanical strength of the thin parts 61h and 61i is low, the thin parts 61h and 61i may be deformed during long-term use. is there. In contrast, in the present embodiment, since the thin-walled portions 61h and 61i correspond to the high-density portion, it is advantageous in increasing the mechanical strength of the thin-walled portions 61h and 61i. Therefore, deformation of the thin-walled portions 61h and 61i can be reliably prevented during long-term use, which is advantageous in improving the durability of the thin-walled portions 61h and 61i.
　また、薄肉部６１ｈ，６１ｉは厚さ寸法が低密度部６１ｊよりも小さいので、薄肉部６１ｈ，６１ｉの熱伝導率が高いと、薄肉部６１ｈ，６１ｉの断熱性能を向上することが困難である。これとは対照的に、本実施の形態であれば、薄肉部６１ｈ，６１ｉが高密度部に相当することで、薄肉部６１ｈ，６１ｉの熱伝導率を低くする上で有利になる。それゆえ、薄肉部６１ｈ，６１ｉの断熱性能を向上する上で有利になる。 Further, since the thin-walled portions 61h and 61i have a smaller thickness than the low-density portion 61j, it is difficult to improve the heat insulating performance of the thin-walled portions 61h and 61i if the thin-walled portions 61h and 61i have high thermal conductivity. .. In contrast, in the present embodiment, since the thin-walled portions 61h and 61i correspond to the high-density portion, it is advantageous in reducing the thermal conductivity of the thin-walled portions 61h and 61i. Therefore, it is advantageous in improving the heat insulating performance of the thin-walled portions 61h and 61i.
　前面断熱材６１は、原料入口部６１ｋ及び原料入口部６１ｍを有している。薄肉部６１ｈは、原料入口部６１ｋに近い位置にある。薄肉部６１ｉは、原料入口部６１ｍに近い位置にある。低密度部６１ｊは、薄肉部６１ｈ，６１ｉに比べて、原料入口部６１ｋ，６１ｍの双方から遠い位置にある。 The front heat insulating material 61 has a raw material inlet portion 61k and a raw material inlet portion 61m. The thin-walled portion 61h is located near the raw material inlet portion 61k. The thin-walled portion 61i is located near the raw material inlet portion 61m. The low-density portion 61j is located farther from both the raw material inlet portions 61k and 61m than the thin-walled portions 61h and 61i.
　後面断熱材６２は、薄肉部６２ｄと、薄肉部６２ｅと、低密度部６２ｆとを有している。薄肉部６２ｄは、低密度部６２ｆの位置の対向距離Ｄ４よりも小さい対向距離Ｄ２の位置に配置されている。薄肉部６２ｅは、低密度部６２ｆの位置の対向距離Ｄ４よりも小さい対向距離Ｄ３の位置に配置されている。薄肉部６２ｄ，６２ｅのそれぞれの厚さ寸法は、低密度部６２ｆの厚さ寸法よりも小さい。薄肉部６２ｄ，６２ｅのそれぞれは、低密度部６２ｆよりも高い密度を有する高密度部に相当している。 The rear surface heat insulating material 62 has a thin-walled portion 62d, a thin-walled portion 62e, and a low-density portion 62f. The thin-walled portion 62d is arranged at a position where the facing distance D2 is smaller than the facing distance D4 at the position of the low-density portion 62f. The thin-walled portion 62e is arranged at a position where the facing distance D3 is smaller than the facing distance D4 at the position of the low-density portion 62f. The thickness dimensions of the thin portions 62d and 62e are smaller than the thickness dimensions of the low density portions 62f. Each of the thin- walled portions 62d and 62e corresponds to a high-density portion having a higher density than the low-density portion 62f.
　薄肉部６２ｄ，６２ｅは厚さ寸法が低密度部６２ｆよりも小さいので、薄肉部６２ｄ，６２ｅの機械的強度が低いと、長期間の使用中に、薄肉部６２ｄ，６２ｅが変形する可能性がある。これとは対照的に、本実施の形態であれば、薄肉部６２ｄ，６２ｅが高密度部に相当することで、薄肉部６２ｄ，６２ｅの機械的強度を高くする上で有利になる。それゆえ、長期間の使用中に薄肉部６２ｄ，６２ｅの変形を確実に防止でき、薄肉部６２ｄ，６２ｅの耐久性を向上する上で有利になる。 Since the thickness of the thin parts 62d and 62e is smaller than that of the low density part 62f, if the mechanical strength of the thin parts 62d and 62e is low, the thin parts 62d and 62e may be deformed during long-term use. is there. In contrast, in the present embodiment, since the thin- walled portions 62d and 62e correspond to the high-density portions, it is advantageous in increasing the mechanical strength of the thin- walled portions 62d and 62e. Therefore, deformation of the thin- walled portions 62d and 62e can be reliably prevented during long-term use, which is advantageous in improving the durability of the thin- walled portions 62d and 62e.
　また、薄肉部６２ｄ，６２ｅは厚さ寸法が低密度部６２ｆよりも小さいので、薄肉部６２ｄ，６２ｅの熱伝導率が高いと、薄肉部６２ｄ，６２ｅの断熱性能を向上することが困難である。これとは対照的に、本実施の形態であれば、薄肉部６２ｄ，６２ｅが高密度部に相当することで、薄肉部６２ｄ，６２ｅの熱伝導率を低くする上で有利になる。それゆえ、薄肉部６２ｄ，６２ｅの断熱性能を向上する上で有利になる。 Further, since the thin- walled portions 62d and 62e have a smaller thickness than the low-density portions 62f, it is difficult to improve the heat insulating performance of the thin- walled portions 62d and 62e if the thin- walled portions 62d and 62e have high thermal conductivity. .. In contrast, in the present embodiment, since the thin- walled portions 62d and 62e correspond to the high-density portions, it is advantageous in reducing the thermal conductivity of the thin- walled portions 62d and 62e. Therefore, it is advantageous in improving the heat insulating performance of the thin- walled portions 62d and 62e.
　後面断熱材６２は、原料入口部６２ｇ及び原料入口部６２ｈを有している。薄肉部６２ｄは、原料入口部６２ｇに近い位置にある。薄肉部６２ｅは、原料入口部６２ｈに近い位置にある。低密度部６２ｆは、薄肉部６２ｄ，６２ｅに比べて、原料入口部６２ｇ，６２ｈの双方から遠い位置にある。 The rear heat insulating material 62 has a raw material inlet portion 62 g and a raw material inlet portion 62 h. The thin-walled portion 62d is located near the raw material inlet portion 62g. The thin-walled portion 62e is located near the raw material inlet portion 62h. The low-density portion 62f is located farther from both the raw material inlet portions 62g and 62h than the thin- walled portions 62d and 62e.
　以上、クローズド注入方式で作られた発泡ポリウレタン断熱材を中心に説明したが、本開示による発泡ポリウレタン断熱材は、オープン注入方式で作られたものでもよい。オープン注入方式を採用する場合には、金型を開いた状態で、高密度にしたい部分の注入量が、低密度にしたい部分の注入量よりも多くなるように、注入口を移動させながらウレタン原液を注入する。その後、金型を閉じて成形する。 The above description has focused on the foamed polyurethane heat insulating material made by the closed injection method, but the foamed polyurethane heat insulating material according to the present disclosure may be made by the open injection method. When adopting the open injection method, urethane is moved while moving the injection port so that the injection amount of the part to be high density is larger than the injection amount of the part to be low density with the mold open. Inject the undiluted solution. After that, the mold is closed and molded.
１　ヒートポンプユニット、　１０　貯湯タンク、　１０ａ　タンク胴部、　１０ｂ　上鏡板、　１０ｃ　下鏡板、　１１　給水配管、　１２　給湯配管、　１３ａ　ヒートポンプ往き配管、　１３ｂ　ヒートポンプ戻り配管、　１４　風呂往き配管、　１５　混合弁、　１６　タンク上部配管、　３０　外郭ケース、　３０ａ　内壁、　３１　蹴込み部、　３２　天板、　３５　支持脚、　４０　貯湯タンクユニット、　５０　貯湯式給湯機、　６０　上部断熱材、　６０ａ　内壁部、　６０ｂ　外壁部、　６０ｃ　内面、　６０ｄ　外面、　６０ｅ　原料入口部、　６０ｆ　嵌合部、　６１　前面断熱材、　６１ａ　支持部、　６１ｂ　外周面、　６１ｃ　低密度部、　６１ｄ　原料入口部、　６１ｅ　嵌合部、　６１ｆ　低密度部、　６１ｇ　原料入口部、　６１ｈ，６１ｉ　薄肉部、　６１ｊ　低密度部、　６１ｋ，６１ｍ　原料入口部、　６２　後面断熱材、　６２ａ　嵌合部、　６２ｂ　低密度部、　６２ｃ　原料入口部、　６２ｄ，６２ｅ　薄肉部、　６２ｆ　低密度部、　６２ｇ，６２ｈ　原料入口部、　６３　下部断熱材、　６３ａ　内壁部、　６３ｂ　外壁部、　６３ｃ　内面、　６３ｄ　外面、　６３ｅ　原料入口部 1 heat pump unit, 10 hot water storage tank, 10a tank body, 10b upper end plate, 10c lower end plate, 11 water supply pipe, 12 hot water supply pipe, 13a heat pump going pipe, 13b heat pump return pipe, 14 bath going pipe, 15 mixing valve, 16 tank Upper piping, 30 outer case, 30a inner wall, 31 riser, 32 top plate, 35 support legs, 40 hot water storage tank unit, 50 hot water storage type water heater, 60 upper heat insulating material, 60a inner wall part, 60b outer wall part, 60c inner surface, 60d outer surface, 60e raw material inlet, 60f fitting part, 61 front heat insulating material, 61a support part, 61b outer peripheral surface, 61c low density part, 61d raw material inlet part, 61e fitting part, 61f low density part, 61g raw material inlet part , 61h, 61i thin-walled part, 61j low-density part, 61k, 61m raw material inlet, 62 rear heat insulating material, 62a fitting part, 62b low-density part, 62c raw material inlet, 62d, 62e thin-walled part, 62f low-density part, 62g, 62h raw material inlet, 63 lower heat insulating material, 63a inner wall, 63b outer wall, 63c inner surface, 63d outer surface, 63e raw material inlet

Claims (9)

  1. 　貯湯式給湯機の貯湯タンクを覆う発泡ポリウレタン断熱材であって、
    　低密度部と、
    　前記低密度部よりも密度が高い少なくとも一つの高密度部と、
    　を備え、
    　前記少なくとも一つの高密度部は、前記貯湯式給湯機の構成部品を支持する支持部を含む発泡ポリウレタン断熱材。     A polyurethane foam insulation that covers the hot water storage tank of a hot water storage type water heater.
    Low density part and
    At least one high-density part with a higher density than the low-density part,
    With
    The at least one high-density portion is a foamed polyurethane heat insulating material including a support portion that supports a component of the hot water storage type water heater.
  2. 　貯湯式給湯機の貯湯タンクを覆う発泡ポリウレタン断熱材であって、
    　低密度部と、
    　前記低密度部よりも密度が高い少なくとも一つの高密度部と、
    　を備え、
    　前記少なくとも一つの高密度部は、前記貯湯タンクの表面に接する内面を有する内壁部を含み、
    　前記内面とは反対側の面である外面を有する外壁部は、前記低密度部に相当する発泡ポリウレタン断熱材。     A polyurethane foam insulation that covers the hot water storage tank of a hot water storage type water heater.
    Low density part and
    At least one high-density part with a higher density than the low-density part,
    With
    The at least one high-density portion includes an inner wall portion having an inner surface in contact with the surface of the hot water storage tank.
    The outer wall portion having an outer surface that is a surface opposite to the inner surface is a foamed polyurethane heat insulating material corresponding to the low density portion.
  3. 　前記少なくとも一つの高密度部は、前記貯湯式給湯機の使用時における鉛直方向の位置に関して、前記低密度部よりも高い位置にある高所部を含む請求項１または請求項２に記載の発泡ポリウレタン断熱材。 The foaming according to claim 1 or 2, wherein the at least one high-density portion includes a high portion located at a position higher than the low-density portion with respect to a vertical position when the hot water storage type water heater is used. Polyurethane insulation.
  4. 　前記貯湯タンクの半径方向に沿う方向の前記発泡ポリウレタン断熱材の寸法は、厚さ寸法であり、
    　前記少なくとも一つの高密度部は、前記低密度部の前記厚さ寸法よりも小さい前記厚さ寸法を有する薄肉部を含む請求項１から請求項３のいずれか一項に記載の発泡ポリウレタン断熱材。     The dimension of the foamed polyurethane heat insulating material in the direction along the radial direction of the hot water storage tank is a thickness dimension.
    The foamed polyurethane heat insulating material according to any one of claims 1 to 3, wherein the at least one high-density portion includes a thin-walled portion having the thickness dimension smaller than the thickness dimension of the low-density portion. ..
  5. 　前記少なくとも一つの高密度部は、単一の前記発泡ポリウレタン断熱材のうちの異なる位置に設けられた複数の高密度部を含む請求項１から請求項４のいずれか一項に記載の発泡ポリウレタン断熱材。 The foamed polyurethane according to any one of claims 1 to 4, wherein the at least one high-density portion includes a plurality of high-density portions provided at different positions in the single polyurethane foam heat insulating material. Insulation material.
  6. 　前記少なくとも一つの高密度部は、他の断熱材に対して嵌合する嵌合部を含む請求項１から請求項５のいずれか一項に記載の発泡ポリウレタン断熱材。 The foamed polyurethane heat insulating material according to any one of claims 1 to 5, wherein the at least one high-density part includes a fitting part that fits into another heat insulating material.
  7. 　請求項１から請求項６のいずれか一項に記載の発泡ポリウレタン断熱材と、
    　前記貯湯タンクと、
    　を備える貯湯式給湯機。     The foamed polyurethane heat insulating material according to any one of claims 1 to 6.
    With the hot water storage tank
    A hot water storage type water heater equipped with.
  8. 　前記貯湯式給湯機の使用時における鉛直方向の位置に関して、前記発泡ポリウレタン断熱材よりも低い位置で前記貯湯タンクを覆う低所断熱材を備え、
    　前記低所断熱材は、前記発泡ポリウレタン断熱材よりも高い熱伝導率を有する請求項７に記載の貯湯式給湯機。     A low-place heat insulating material that covers the hot water storage tank at a position lower than the foamed polyurethane heat insulating material with respect to the vertical position when the hot water storage type water heater is used is provided.
    The hot water storage type water heater according to claim 7, wherein the low-place heat insulating material has a higher thermal conductivity than the foamed polyurethane heat insulating material.
  9. 　前記貯湯タンク及び前記発泡ポリウレタン断熱材を収納する外郭ケースを備え、
    　前記貯湯タンクの表面であるタンク表面と前記外郭ケースの内壁との間の距離を前記タンク表面の法線に沿って測った距離は、対向距離であり、
    　前記少なくとも一つの高密度部は、前記低密度部の位置の前記対向距離よりも小さい前記対向距離の位置に配置された薄肉部を含む請求項７または請求項８に記載の貯湯式給湯機。     The hot water storage tank and the outer case for storing the foamed polyurethane heat insulating material are provided.
    The distance measured by measuring the distance between the tank surface, which is the surface of the hot water storage tank, and the inner wall of the outer case along the normal line of the tank surface is the facing distance.
    The hot water storage type water heater according to claim 7 or 8, wherein the at least one high-density portion includes a thin-walled portion arranged at a position of the facing distance smaller than the facing distance of the position of the low-density portion.
PCT/JP2019/016978 2019-04-22 2019-04-22 Polyurethane foam insulation material and storage water heater WO2020217270A1 (en)

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JP2000166760A (en) * 1998-12-10 2000-06-20 Aporo:Kk Heat storage and retaining container
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JP2013217505A (en) * 2012-04-04 2013-10-24 Mitsubishi Electric Corp Heat insulating structure of hot water storage type water heater and method for manufacturing the same
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JPS58203337A (en) * 1982-05-20 1983-11-26 Matsushita Electric Ind Co Ltd Heat insulating method for hot water storage tank
JP2000166760A (en) * 1998-12-10 2000-06-20 Aporo:Kk Heat storage and retaining container
JP2004197960A (en) * 2002-12-16 2004-07-15 Corona Corp Hot water storage tank, and molded heat insulation member for hot water storage tank
JP2011237072A (en) * 2010-05-07 2011-11-24 Mitsubishi Electric Corp Hot water storage tank unit
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JP2013217505A (en) * 2012-04-04 2013-10-24 Mitsubishi Electric Corp Heat insulating structure of hot water storage type water heater and method for manufacturing the same
JP2014066369A (en) * 2012-09-24 2014-04-17 Daikin Ind Ltd Tank heat insulation structure and hot water storage tank device
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