WO2020217270A1 - Matériau d'isolation en mousse de polyuréthane et chauffe-eau de stockage - Google Patents

Matériau d'isolation en mousse de polyuréthane et chauffe-eau de stockage 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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Prior art keywords
hot water
heat insulating
water storage
density
insulating material
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PCT/JP2019/016978
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English (en)
Japanese (ja)
Inventor
直紀 柴崎
謙作 畑中
修平 内藤
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2019/016978 priority Critical patent/WO2020217270A1/fr
Priority to JP2021515323A priority patent/JP7156510B2/ja
Publication of WO2020217270A1 publication Critical patent/WO2020217270A1/fr

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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.

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  • Heat-Pump Type And Storage Water Heaters (AREA)

Abstract

La présente invention concerne un matériau d'isolation en mousse de polyuréthane (61) recouvrant le réservoir de stockage d'eau chaude (10) d'un chauffe-eau de stockage. Le matériau d'isolation en mousse de polyuréthane (61) est pourvu d'une partie basse densité (61c) et d'au moins une partie haute densité (61a, 61e) ayant une densité supérieure à celle de la partie basse densité (61c). La ou les parties haute densité (61a, 61e) comprennent une partie de support (61a) qui supporte les composants du chauffe-eau de stockage. Le matériau d'isolation en mousse de polyuréthane (60) recouvre le réservoir de stockage d'eau chaude (10) du chauffe-eau de stockage. Le matériau d'isolation en mousse de polyuréthane (60) est pourvu d'une partie basse densité (60b) et d'au moins une partie haute densité (60a) ayant une densité supérieure à celle de la partie basse densité (60b). La ou les parties haute densité (60a) comprennent une partie paroi interne (60a) ayant une surface interne (60c) en contact avec la surface du réservoir de stockage d'eau chaude (10). Une partie paroi externe (60b) ayant une surface externe (60d) qui est la surface sur le côté opposé par rapport à la surface interne (60c) correspond à la partie basse densité (60b).
PCT/JP2019/016978 2019-04-22 2019-04-22 Matériau d'isolation en mousse de polyuréthane et chauffe-eau de stockage WO2020217270A1 (fr)

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PCT/JP2019/016978 WO2020217270A1 (fr) 2019-04-22 2019-04-22 Matériau d'isolation en mousse de polyuréthane et chauffe-eau de stockage
JP2021515323A JP7156510B2 (ja) 2019-04-22 2019-04-22 発泡ポリウレタン断熱材及び貯湯式給湯機

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* Cited by examiner, † Cited by third party
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JPS58203337A (ja) * 1982-05-20 1983-11-26 Matsushita Electric Ind Co Ltd 貯湯タンクの断熱方法
JP2000166760A (ja) * 1998-12-10 2000-06-20 Aporo:Kk 蓄熱保温容器
JP2004197960A (ja) * 2002-12-16 2004-07-15 Corona Corp 貯湯タンクおよび貯湯タンク用成型断熱材
JP2011237072A (ja) * 2010-05-07 2011-11-24 Mitsubishi Electric Corp 貯湯タンクユニット
JP2012197983A (ja) * 2011-03-22 2012-10-18 Mitsubishi Electric Corp 貯湯式給湯機
JP2013217505A (ja) * 2012-04-04 2013-10-24 Mitsubishi Electric Corp 貯湯式給湯機の断熱構造体及びその製造方法
JP2014066369A (ja) * 2012-09-24 2014-04-17 Daikin Ind Ltd タンク断熱構造および貯湯タンク装置
JP2015148438A (ja) * 2015-05-28 2015-08-20 日立アプライアンス株式会社 タンクユニット、その製造方法及び給湯システム
JP2017171770A (ja) * 2016-03-23 2017-09-28 積水化成品工業株式会社 ポリスチレン系樹脂発泡シート及びその製造方法、並びに、成形体
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