JP6252368B2 - Hot water storage water heater - Google Patents

Description

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

  Hot water storage water heaters configured to store hot water obtained by heating water by heating means such as a heat pump in a hot water storage tank, take out hot water from this hot water storage tank when necessary, and supply it to a hot water supply terminal are widely used. It is used. In order to suppress heat dissipation loss from the hot water storage tank, a heat insulating material is disposed around the hot water storage tank. Conventionally, foamed molded heat insulating materials such as expanded polystyrene are generally used as the heat insulating material, but in order to further improve the heat insulation performance of the hot water storage tank, a technique using a vacuum heat insulating material with higher heat insulating performance has also been proposed. Yes. A vacuum insulation material is a bag made of a core material (core material) obtained by processing foam, powder, fiber, etc. into a sheet with a shell material made of a gas barrier film (plastic film, plastic metal laminate film, etc.). The inside of the gas barrier film is wrapped and evacuated, and the periphery of the gas barrier film is thermally welded and sealed.

  Patent Document 1 discloses a structure in which an outer peripheral surface of a hot water storage tank has an uneven peripheral rib, the outer peripheral surface of the hot water storage tank including the peripheral rib is covered with a normal heat insulating material, and a vacuum heat insulating material is stacked on the outside thereof. Has been.

  In Patent Document 2, in order to simplify the work of attaching the vacuum heat insulating material, a convex portion is provided locally on the foamable heat insulating material covering the outer peripheral surface of the hot water storage tank, and the vacuum heat insulating material can be placed on the convex portion. A structure is disclosed.

JP2013-221634A JP2013-2752A

  In some cases, a reinforcing portion for preventing deformation of the hot water storage tank when the pressure in the hot water storage tank becomes negative is provided on the outer peripheral surface of the hot water storage tank. The peripheral rib of Patent Document 1 corresponds to this reinforcing portion. The molded heat insulating material that covers the outer peripheral surface of the hot water storage tank including the reinforcing portion that protrudes from the outer peripheral surface of the hot water storage tank tends to be thick. When the outside of the molded heat insulating material is further covered with a vacuum heat insulating material, the thickness of the whole heat insulating material is further increased. As a result, the hot water storage type water heater becomes larger.

  The present invention has been made to solve the above-described problems, and provides a hot water storage type hot water heater capable of arranging a vacuum heat insulating material in a space-saving manner when a reinforcing portion is provided on the outer peripheral surface of a hot water storage tank. For the purpose.

A hot water storage type water heater according to the present invention includes a hot water storage tank, a reinforcing portion protruding from the outer peripheral surface of the hot water storage tank, a thick wall portion covering the outer peripheral surface and the reinforcing portion of the hot water storage tank, and a hot water storage tank at a position above the reinforcing portion. A thin-walled portion covering the outer peripheral surface of the thin-walled portion, and a thin-walled portion having an outer diameter smaller than that of the thick-walled portion and a vacuum heat-insulating material covering the outer peripheral surface of the thin-walled portion. Is smaller than the maximum protruding length of the reinforcing portion in the radial direction from the outer peripheral surface of the hot water storage tank .
The hot water storage type water heater according to the present invention includes a hot water storage tank, a reinforcing portion protruding from the outer peripheral surface of the hot water storage tank, a thick wall portion covering the outer peripheral surface and the reinforcing portion of the hot water tank, and a position above the reinforcing portion. A thin-walled portion covering the outer peripheral surface of the hot water storage tank, and a thick-walled portion provided with a molded heat insulating material whose outer diameter is smaller than the outer diameter of the thick-walled portion and a vacuum heat-insulating material covering the outer peripheral surface of the thin-walled portion. The position of the boundary between the thin-walled portion and the thin-walled portion is higher than the upper end of the reinforcing portion, and there is a reinforcing portion protruding from the outer peripheral surface of the hot water storage tank above the position of the boundary between the thick-walled portion and the thin-walled portion. The thin portion does not cover the reinforcing portion protruding from the outer peripheral surface of the hot water storage tank.

  According to the hot water storage type water heater of the present invention, it is possible to arrange the vacuum heat insulating material in a space-saving manner when the reinforcing portion is provided on the outer peripheral surface of the hot water storage tank.

It is a perspective view which shows the external appearance of the hot water storage tank unit 1 with which the hot water storage type water heater of Embodiment 1 of this invention is provided. It is AA sectional drawing (longitudinal sectional view) in FIG. It is BB sectional drawing (transverse sectional view) in FIG. It is CC sectional drawing (transverse sectional view) in FIG. It is a side view which shows the state which attached the trunk | drum molded heat insulating material and the vacuum heat insulating material to the hot water storage tank in Embodiment 1 of this invention. It is a perspective view which shows the state which attached the trunk | drum molded heat insulating material and the vacuum heat insulating material to the hot water storage tank in Embodiment 1 of this invention. It is sectional drawing to which a part of FIG. 2 was expanded. It is a perspective view which shows the state which attached the trunk | drum molded heat insulating material and the vacuum heat insulating material to the hot water storage tank in Embodiment 2 of this invention. It is sectional drawing of the same position as FIG. 7 in the hot water storage tank unit of Embodiment 2 of this invention.

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

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

  A hot water storage tank unit 1 shown in these drawings includes a substantially cylindrical hot water storage tank 2, a substantially rectangular parallelepiped box-shaped outer case 12 that accommodates the hot water storage tank 2, and a reinforcing ring 3 (reinforcing portion) that reinforces the hot water storage tank 2. And a heat insulating material (body forming heat insulating material 4, upper forming heat insulating material 6, lower forming heat insulating material 7 and vacuum heat insulating material 8) covering hot water storage tank 2. As shown in FIG. 1, the outer case 12 is fixed to the ground or a pedestal via a plurality of legs 13 provided at the bottom thereof.

  In the hot water storage tank 2, high temperature hot water heated by heating means (not shown) is stored from the upper side, and low temperature water supplied from a water source such as tap water is stored from the lower side, whereby temperature stratification can be formed. This temperature stratification is maintained without mixing due to the specific gravity difference. As the heating means, for example, a heat pump, an electric heater or the like is used, but illustration and detailed description thereof are omitted in this specification. The heating means may be provided separately from the hot water storage tank unit 1 or may be provided inside the hot water storage tank unit 1. Between the outer case 12 of the hot water storage tank unit 1 and the hot water storage tank 2, a water supply pipe for supplying water into the hot water storage tank 2, a hot water supply pipe for extracting hot water from the hot water storage tank 2, and water and hot water are mixed to a predetermined temperature. Devices such as a mixing valve for supplying hot water and a water circulation pump are arranged, and illustration and detailed description of these devices are also omitted.

  As shown in FIGS. 2 and 4, a reinforcing ring 3 is attached to the outer peripheral surface of the body portion of the hot water storage tank 2. The reinforcing ring 3 has an annular shape having an inner diameter substantially equal to the outer diameter of the body portion of the hot water storage tank 2. The reinforcing ring 3 protrudes from the outer peripheral surface of the body portion of the hot water storage tank 2. The reinforcing ring 3 forms a ridge extending along the circumferential direction of the hot water storage tank 2. By providing the reinforcing ring 3, it is possible to reliably suppress the hot water storage tank 2 from being deformed at atmospheric pressure when the inside of the hot water storage tank 2 becomes negative pressure. The material of the reinforcing ring 3 is not particularly limited, but iron (cold rolled steel sheet) is preferable from the viewpoint of obtaining high strength. The reinforcing ring 3 may be composed of a plurality of members or may be composed of a single member. In the first embodiment, the reinforcing ring 3 has a U-shaped cross-sectional shape. When the reinforcing ring 3 having such a U-shaped cross-sectional shape or an L-shaped cross-sectional shape is used, the hot water storage tank 2 can be reinforced with higher strength. In the first embodiment, the reinforcing ring 3 is attached at a position below half the height of the hot water storage tank 2.

  In the first embodiment, a reinforcing ring 3 made of a member different from the hot water storage tank 2 is provided as a reinforcing portion of the hot water storage tank 2. By doing in this way, the hot water storage tank 2 can be reinforced with higher strength. However, in the present invention, the reinforcing portion may be formed integrally with the hot water storage tank 2 by processing a part of the body of the hot water storage tank 2 so as to protrude in the radial direction of the hot water storage tank 2.

  The material of the trunk molded heat insulating material 4, the upper molded heat insulating material 6, and the lower molded heat insulating material 7 is made of, for example, a foamable molded heat insulating material made of foamed polystyrene, or a material having a heat insulating performance higher than that of foamed polystyrene. It is desirable to be a foamable heat insulating material. The body forming heat insulating material 4 covers the outer peripheral surface of the body of the hot water storage tank 2. The upper molded heat insulating material 6 covers the upper part of the hot water storage tank 2. The lower molded heat insulating material 7 covers the lower part of the hot water storage tank 2. It is preferable that the inner surfaces of the trunk molded heat insulating material 4, the upper molded heat insulating material 6, and the lower molded heat insulating material 7 are in contact with the surface of the hot water storage tank 2.

  The body forming heat insulating material 4 includes a thick part 4a that covers the outer peripheral surface of the body part of the hot water storage tank 2 and the reinforcing ring 3, and a thin part that covers the outer peripheral surface of the body part of the hot water storage tank 2 at a position above the reinforcing ring 3. 4b. The outer diameter of the thin part 4b is smaller than the outer diameter of the thick part 4a. A step 4c is formed at the boundary between the thick part 4a and the thin part 4b. The outer peripheral surface of the thin portion 4b is desirably a smooth curved surface. A groove-shaped recess 4d extending along the circumferential direction is formed on the inner peripheral surface of the thick portion 4a. The reinforcing ring 3 is accommodated in the recess 4d. By covering the reinforcing ring 3 with the thick part 4 a of the body forming heat insulating material 4, it is possible to suppress the heat of the hot water storage tank 2 from radiating from the position of the reinforcing ring 3. The position of the upper end of the thick portion 4 a, that is, the position of the step 4 c is higher than the upper end of the reinforcing ring 3. The lower end of the thick part 4a is in contact with the lower molded heat insulating material 7. The upper end of the thin portion 4 b is in contact with the upper molded heat insulating material 6.

  The vacuum heat insulating material 8 has a sheet shape. The vacuum heat insulating material 8 is arrange | positioned so that the outer peripheral surface of the thin part 4b may be covered, without covering the outer peripheral surface of the thick part 4a of the trunk | drum molded heat insulating material 4. FIG. The vacuum heat insulating material 8 is preferably in close contact with the outer peripheral surface of the thin portion 4b. The vacuum heat insulating material 8 is a bag made of, for example, a core material (core material) obtained by processing foam, powder, fiber or the like into a sheet with an outer skin material made of a gas barrier film (plastic film, plastic metal laminate film, etc.). The inside of the gas barrier film is in a vacuum state and the outer periphery of the gas barrier film is heat-sealed and sealed. The vacuum heat insulating material 8 has a heat insulating performance higher than that of the foamable heat insulating material. By covering the upper side of the body portion of the hot water storage tank 2 with such a high-performance vacuum heat insulating material 8, it is possible to reliably suppress heat dissipation from the upper half of the hot water storage tank 2 where the hot water is stored for a long time. The heat retention performance of the hot water storage tank 2 can be further improved.

  Since the thin-walled portion 4b of the body forming heat insulating material 4 is interposed between the vacuum heat insulating material 8 and the hot water storage tank 2, the vacuum heat insulating material 8 is not in direct contact with the hot water storage tank 2, so that the heat deterioration of the vacuum heat insulating material 8, In particular, deterioration of the outer skin material can be prevented. For this reason, it can suppress reliably over a long period that the vacuum state inside the vacuum heat insulating material 8 is lost because a leak occurs in the outer skin material of the vacuum heat insulating material 8.

  The thin portion 4 b is located above the reinforcing ring 3 protruding from the outer peripheral surface of the body portion of the hot water storage tank 2 and does not cover the reinforcing ring 3. For this reason, the thin part 4b can be made thin enough compared with the thick part 4a. By providing the vacuum heat insulating material 8 on the outer periphery of the thin wall portion 4b, the vacuum heat insulating material 8 can be disposed in a space-saving manner. As a result, the outer case 12 and the hot water storage tank unit 1 can be reduced in size and can be installed in a narrow space.

  The position of the reinforcing ring 3 with respect to the height direction of the hot water storage tank 2 is desirably set to a height equal to or lower than the half height position of the hot water storage tank 2 as in the first embodiment. Thus, by making the position of the reinforcing ring 3 relatively low, the upper half of the body portion of the hot water storage tank 2 can be covered with the vacuum heat insulating material 8. As a result, since heat radiation from the upper half of the hot water storage tank 2 in which the hot water is stored for a long time can be more reliably suppressed, the heat retention performance of the hot water storage tank 2 can be further improved.

  The lower end of the vacuum heat insulating material 8 is in contact with the step 4c at the boundary between the thick portion 4a and the thin portion 4b of the body forming heat insulating material 4. By doing in this way, the heat dissipation from the level | step difference 4c vicinity can be suppressed reliably. Moreover, since the vacuum heat insulating material 8 and the thick part 4a do not overlap, the vacuum heat insulating material 8 can be arranged in a space-saving manner. Moreover, the upper end of the vacuum heat insulating material 8 has reached the position of the substantially same height as the upper end of the trunk | drum molded heat insulating material 4 (thin wall part 4b). Thereby, the heat radiation from the upper part of the hot water storage tank 2 can be suppressed more reliably.

  The thick part 4 a of the body forming heat insulating material 4 is not covered with the vacuum heat insulating material 8. The low temperature water is stored in the lower part of the hot water storage tank 2 for a long time. Therefore, compared with the upper part of the hot water storage tank 2, the lower part of the hot water storage tank 2 has a low requirement for heat insulation performance. The thick part 4 a of the body forming heat insulating material 4 is at a relatively low position of the hot water storage tank 2. For this reason, even if the thick part 4a of the trunk | drum molded heat insulating material 4 is not covered with the vacuum heat insulating material 8, a heat dissipation loss can fully be suppressed.

  In this Embodiment 1, as shown in FIG.3 and FIG.4, the trunk | drum molded heat insulating material 4 is divided | segmented into two in the circumferential direction of the trunk | drum of the hot water storage tank 2. As shown in FIG. Each of the body forming heat insulating materials 4 covers approximately a half circumference of the hot water storage tank 2. By combining the two body molded heat insulating materials 4, almost the entire circumference of the body of the hot water storage tank 2 is covered with the body molded heat insulating material 4. Not limited to such a configuration, in the present invention, the body forming heat insulating material 4 may be divided into three or more pieces in the circumferential direction of the body portion of the hot water storage tank 2, or one cylindrical member The body forming heat insulating material 4 may be configured as follows. In addition, it is not always necessary to cover the entire circumference of the body portion of the hot water storage tank 2 with the body portion molded heat insulating material 4, and a part of the body portion of the hot water storage tank 2 in the circumferential direction may be covered with another heat insulating material.

  In the first embodiment, the vacuum heat insulating material 8 is disposed over substantially the entire circumference of the body portion of the hot water storage tank 2. Thereby, the heat retention performance of the hot water storage tank 2 can be further improved. The vacuum heat insulating material 8 may be divided into a plurality of pieces in the circumferential direction of the body portion of the hot water storage tank 2 or may be constituted by one sheet.

  5 and 6 are a side view and a perspective view, respectively, showing a state in which the body forming heat insulating material 4 and the vacuum heat insulating material 8 are attached to the hot water storage tank 2 in the first embodiment. In FIG. 6, the vacuum heat insulating material 8 is represented by a one-dot chain line. As shown in FIG. 5, in the first embodiment, the vacuum heat insulating material 8 is fixed to the body forming heat insulating material 4 by fixing the vacuum heat insulating material 8 with an adhesive tape 14. However, in the present invention, the method for fixing the vacuum heat insulating material 8 is not limited to the method using the adhesive tape 14, and any method may be used.

  FIG. 7 is an enlarged cross-sectional view of a part of FIG. As shown in FIG. 7, the maximum thickness L <b> 1 of the thick portion 4 a of the body forming heat insulating material 4 is larger than the maximum protruding length L <b> 2 of the reinforcing ring 3 in the radial direction from the outer peripheral surface of the hot water storage tank 2. In the first embodiment, the thickness (maximum thickness) L3 of the thin portion 4b of the body forming heat insulating material 4 is smaller than the maximum protruding length L2 of the reinforcing ring 3. By doing in this way, since the thickness L3 of the thin part 4b can be made small, the vacuum heat insulating material 8 can be arrange | positioned more space-saving. Moreover, since the maximum protrusion length L2 of the reinforcing ring 3 can be increased, the hot water storage tank 2 can be reinforced with higher strength.

  As described above, according to the first embodiment, the vacuum heat insulating material 8 can be disposed in a space-saving manner in the case where the outer peripheral surface of the hot water storage tank 2 has the reinforcing portion. In particular, when the reinforcing portion (reinforcing ring 3) is configured separately from the hot water storage tank 2 as in the first embodiment, the maximum protruding length L2 of the reinforcing portion (reinforcing ring 3) tends to be large. Even in such a configuration, the vacuum heat insulating material 8 can be disposed in a space-saving manner.

  In addition, by providing the thin-walled portion 4b in the body-shaped heat insulating material 4, the volume of the body-shaped heat insulating material 4 can be reduced as compared with the case where the entire body-shaped heat insulating material 4 has the same thickness as the thick-walled portion 4a. The size can be reduced and the cost can be reduced.

  Moreover, in this Embodiment 1, when attaching the vacuum heat insulating material 8, the lower end of the vacuum heat insulating material 8 may be put on the level | step difference 4c of the boundary of the thick part 4a of the trunk | drum molded heat insulating material 4 and the thin part 4b. it can. For this reason, the vertical positioning of the vacuum heat insulating material 8 can be easily performed, and the efficiency of the attaching operation can be improved. Moreover, since the thick part 4a includes the reinforcing ring 3 having higher strength than the material of the body forming heat insulating material 4, the thick part 4a can withstand a higher load than when the reinforcing ring 3 is not included. Therefore, the step 4c can stably support the load of the vacuum heat insulating material 8.

Embodiment 2. FIG.
Next, the second embodiment of the present invention will be described with reference to FIG. 8 and FIG. 9. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. The description is omitted.

  FIG. 8 is a perspective view showing a state in which the body forming heat insulating material 4 and the vacuum heat insulating material 8 are attached to the hot water storage tank 2 in the second embodiment. In FIG. 8, the vacuum heat insulating material 8 is represented by a one-dot chain line. FIG. 9 is a cross-sectional view at the same position as FIG. 7 in the hot water storage tank unit 1 of the second embodiment.

  As shown in FIG.8 and FIG.9, the trunk | drum molded heat insulating material 4 in this Embodiment 2 has the 2nd thin part 4e. The second thin portion 4 e is located below the thick portion 4 a and covers the outer peripheral surface of the trunk portion of the hot water storage tank 2. The outer diameter of the second thin portion 4e is smaller than the outer diameter of the thick portion 4a. The second thin portion 4e is at a position below the reinforcing ring 3. That is, the position of the upper end of the second thin portion 4 e is lower than the lower end of the reinforcing ring 3. A step 4f is formed between the thick part 4a and the second thin part 4e.

  In the second embodiment, by providing the second thin portion 4e, the volume of the body forming heat insulating material 4 can be made smaller than that in the first embodiment, and the cost can be further reduced. The low temperature water is stored in the lower part of the hot water storage tank 2 for a long time. Therefore, compared with the upper part of the hot water storage tank 2, the lower part of the hot water storage tank 2 has a low requirement for heat insulation performance. The second thin portion 4 e of the body forming heat insulating material 4 is in a relatively low position of the hot water storage tank 2. For this reason, even if the thickness of the trunk | drum molded heat insulating material 4 is small in the position of the 2nd thin part 4e, a heat dissipation loss can fully be suppressed.

  As shown in FIG. 9, it is desirable that the thickness (maximum thickness) L5 of the second thin portion 4e is smaller than the maximum protruding length L2 of the reinforcing ring 3. By doing in this way, the volume of the trunk | drum molded heat insulating material 4 can be made further smaller.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit, 2 Hot water storage tank, 3 Reinforcement ring, 4 Body shaping | molding heat insulating material, 4a Thick part, 4b Thin wall part, 4c Level difference, 4d Recessed part, 4e 2nd thin thickness part, 4f Level difference, 6 Upper molding heat insulating material, 7 Lower molded insulation, 8 Vacuum insulation, 12 Outer case, 13 legs, 14 Adhesive tape

Claims (5)

A hot water storage tank,
A reinforcing portion protruding from the outer peripheral surface of the hot water storage tank;
A thick portion covering the outer peripheral surface of the hot water storage tank and the reinforcing portion, and a thin portion covering the outer peripheral surface of the hot water storage tank at a position above the reinforcing portion, and the outer diameter of the thin portion is the thick wall portion. Molded insulation smaller than the outer diameter of the part,
A vacuum heat insulating material covering the outer peripheral surface of the thin portion;
Prepared ,
The thickness of the thin wall portion is a hot water storage type hot water heater smaller than the maximum protruding length of the reinforcing portion in the radial direction from the outer peripheral surface of the hot water storage tank . A hot water storage tank,
A reinforcing portion protruding from the outer peripheral surface of the hot water storage tank;
A thick portion covering the outer peripheral surface of the hot water storage tank and the reinforcing portion, and a thin portion covering the outer peripheral surface of the hot water storage tank at a position above the reinforcing portion, and the outer diameter of the thin portion is the thick wall portion. Molded insulation smaller than the outer diameter of the part,
A vacuum heat insulating material covering the outer peripheral surface of the thin portion;
Prepared ,
The position of the boundary between the thick part and the thin part is higher than the upper end of the reinforcing part,
There is no reinforcing part protruding from the outer peripheral surface of the hot water storage tank above the position of the boundary between the thick part and the thin part,
The thin wall portion is a hot water storage type hot water heater that does not cover a reinforcing portion protruding from an outer peripheral surface of the hot water storage tank . The hot water storage type hot water supply device according to claim 1 or 2 , wherein a lower end of the vacuum heat insulating material is in contact with a step formed at a boundary between the thick portion and the thin portion. The hot water storage type hot water supply device according to any one of claims 1 to 3, wherein the reinforcing portion is at a height equal to or lower than a half height of the hot water storage tank.   The molded heat insulating material has a second thin portion that is located below the thick portion and covers the outer peripheral surface of the hot water storage tank, and the outer diameter of the second thin portion is smaller than the outer diameter of the thick portion. The hot water storage type hot water supply device according to any one of claims 1 to 4.

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