JP6844387B2 - Hot water storage type water heater - Google Patents

Description

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

For example, a hot water storage type water heater having a hot water storage tank for storing hot water heated by a heating means such as a heat pump unit and supplying hot water from the hot water storage tank to a hot water supply terminal such as a bath, a kitchen, or a wash basin is widely used. Such a hot water storage type water heater includes a heat insulating material that covers the periphery of the hot water storage tank in order to suppress heat dissipation loss, and an outer case that serves as an exterior covering the hot water storage tank covered with the heat insulating material. The outer case is made of metal and has a side plate that covers the side surface of the hot water storage tank and a top plate that covers the upper surface of the hot water storage tank.

In this type of hot water storage type water heater, hot water enters and exits from the upper side of the hot water storage tank. Then, unheated water is introduced to the lower side of the hot water on the upper side in the hot water storage tank, and the inside of the storage tank is always filled. Therefore, there is always hot water in the upper part of the hot water storage tank, and the temperature is high. Therefore, it is important to prevent heat dissipation loss especially from the upper part of the hot water storage tank.

In the conventional hot water storage type water heater disclosed in Patent Document 1 below, the upper surface of the hot water storage tank is covered with a molded heat insulating material. Inside the molded heat insulating material, a high-temperature member storage space for storing a mixing valve or the like installed on the hot water storage tank is formed. The vacuum heat insulating material is closely arranged on the upper part of the molded heat insulating material forming the high temperature member storage space. As a result, heat dissipation loss from the portion where the wall thickness of the molded heat insulating material is thin is suppressed on the high temperature member storage space.

Japanese Unexamined Patent Publication No. 2009-92306

In the hot water storage type water heater disclosed in Patent Document 1, since the vacuum heat insulating material is exposed, the vacuum heat insulating material may be damaged during manufacturing and assembly. If the outer cover material of the vacuum heat insulating material is scratched, pinholes may occur and the vacuum state cannot be maintained, and the vacuum heat insulating material may not exhibit its original heat insulating properties.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a hot water storage type water heater capable of surely improving the heat retention performance of a hot water storage tank.

The hot water storage type water supply machine according to the present invention has a hot water storage tank, a first molded heat insulating material that covers the upper portion of the hot water storage tank and has an upper surface, and a first surface in contact with the upper surface of the first molded heat insulating material, which is opposite to the first surface. a vacuum heat insulating material having a second surface side, possess a contact portion in contact with the first mold heat insulating material, and a lower surface facing the second surface of the vacuum heat insulating material, the second mold heat insulating material covering the vacuum heat insulating material And an outer case for storing the hot water storage tank, the first molded heat insulating material, the vacuum heat insulating material, and the second molded heat insulating material, and between the second surface of the vacuum heat insulating material and the lower surface of the second molded heat insulating material. space there is, the contact portion is in contact with the first mold heat insulating material, a shall receive the load of the second mold heat insulating material is first molded insulation.

According to the present invention, it is possible to surely improve the heat retention performance of the hot water storage tank.

It is a perspective view which shows the appearance of the hot water storage type water heater according to Embodiment 1. FIG. It is a vertical cross-sectional view which cut the hot water storage type water heater in the virtual plane in FIG. It is sectional drawing in the state which the 1st upper molded heat insulating material, the vacuum heat insulating material, and the 2nd upper molded heat insulating material are separated.

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.

Embodiment 1.
FIG. 1 is a perspective view showing the appearance of the hot water storage type water heater 1 according to the first embodiment. As shown in FIG. 1, the hot water storage type water heater 1 includes an outer case 3. The outer case 3 has a shape close to a rectangular parallelepiped. FIG. 2 is a vertical cross-sectional view of the hot water storage type water heater 1 cut along the virtual plane 100 in FIG. FIG. 2 is a schematic diagram. The dimensional ratio in FIG. 2 does not necessarily reflect the actual dimensional ratio.

As shown in FIG. 2, a hot water storage tank 2 covered with a heat insulating material is housed in the outer case 3. In the present embodiment, the heat insulating materials covering the hot water storage tank 2 are the lower molded heat insulating material 7, the front molded heat insulating material 8, the rear molded heat insulating material 9, the first upper molded heat insulating material 10, the vacuum heat insulating material 11, and the second. The upper molded heat insulating material 12 is included. The outer case 3 includes a bottom plate 13, an outer case side plate 15, and an outer case top plate 16. The outer case side plate 15 forms four side surfaces of the hot water storage type water heater 1.

A plurality of hot water storage tank support pieces 5 are attached to the lower portion of the hot water storage tank 2 at intervals in the circumferential direction. The lower ends of the hot water storage tank support pieces 5 are connected to the upper ends of the hot water storage tank legs 6. There is a bottom plate 13 between the hot water storage tank support piece 5 and the hot water storage tank leg 6. That is, the hot water storage tank support piece 5 is inside the outer case 3, and the hot water storage tank legs 6 are outside the outer case 3. The weight of the hot water storage tank 2 is supported by the hot water storage tank support piece 5 and the hot water storage tank leg 6.

The lower end of the outer case side plate 15 is fixed to the bottom plate 13 by fastening parts such as screws. The outer case top plate 16 is fixed to the upper end of the outer case side plate 15 by fastening parts such as screws. The weights of the outer case side plate 15 and the outer case top plate 16 are supported by the hot water storage tank legs 6 via the bottom plate 13. As described above, the hot water storage tank 2 and the outer case 3 other than the bottom plate 13 are not directly coupled and fixed.

The lower molded heat insulating material 7 covers the lower portion of the hot water storage tank 2 including the end plate. The front molded heat insulating material 8 and the rear molded heat insulating material 9 cover the cylindrical body of the hot water storage tank 2. The front molded heat insulating material 8 covers the region of the body of the hot water storage tank 2 on the front side of the hot water storage type water heater 1. The rear molded heat insulating material 9 covers the region of the body of the hot water storage tank 2 on the rear side of the hot water storage type water heater 1. The first upper molded heat insulating material 10 covers the upper portion of the hot water storage tank 2 including the end plate. The vacuum heat insulating material 11 is in contact with the upper surface 10a of the first upper molded heat insulating material 10. The second upper molded heat insulating material 12 is assembled from the upper side to the first upper molded heat insulating material 10. The second upper molded heat insulating material 12 has a lower surface 12a facing the vacuum heat insulating material 11. A space 14 is formed between the lower surface 12a of the second upper molded heat insulating material 12 and the vacuum heat insulating material 11.

Each of the lower molded insulation 7, front molded insulation 8, rear molded insulation 9, first upper molded insulation 10, and second upper molded insulation 12 is made of foamed plastic, such as expanded polystyrene. ing. In the present embodiment, the lower molded heat insulating material 7, the front molded heat insulating material 8, the rear molded heat insulating material 9, and the first upper molded heat insulating material 10 are molded into a shape that can be adhered to the surface of the hot water storage tank 2. .. The lower molded heat insulating material 7, the front molded heat insulating material 8, the rear molded heat insulating material 9, and the first upper molded heat insulating material 10 cover almost the entire surface of the hot water storage tank 2.

A hot water introduction outlet 2a is provided above the hot water storage tank 2. One end of the hot water supply pipe 4 is connected to the hot water introduction outlet 2a. The other end of the hot water supply pipe 4 is connected to the valve 17. The hot water storage type water heater 1 includes a heating device that heats the water in the hot water storage tank 2 to make hot water. This heating device may have any configuration. For example, it may be a heat pump type heating device or an electric heater installed in the hot water storage tank 2. A heating device may be provided outside the outer case 3. Since the heating device is not a feature of the present invention, illustration and detailed description thereof are omitted in the present specification. Further, the outer case 3 may be provided with equipment such as pipes, valves, pumps, heat exchangers, etc. other than those shown in FIG. 2, but in the present specification, these equipments are also illustrated and detailed. The explanation is omitted.

FIG. 3 is a cross-sectional view of the first upper molded heat insulating material 10, the vacuum heat insulating material 11, and the second upper molded heat insulating material 12 in a separated state. On the lower surface of the first upper molded heat insulating material 10, a concave curved surface 10b having a shape corresponding to the convex curved surface of the upper end plate of the hot water storage tank 2 is formed. The first upper molded heat insulating material 10 is formed with a recess 10c so as not to spatially interfere with the hot water introduction outlet 2a. The first upper molded heat insulating material 10 is formed with a hollow portion 10d for preventing spatial interference with the hot water supply pipe 4. Instead of the configuration in which the hollow portion 10d is provided, the following may be used. The first upper molded heat insulating material 10 is composed of two or more parts. The hot water supply pipe 4 connected to the hot water storage tank 2 passes between the two components constituting the first upper molded heat insulating material 10. In this case, since it is not necessary to form the hollow portion 10d, the processing becomes easy.

The upper surface 10a of the first upper molded heat insulating material 10 is formed flat. The vacuum heat insulating material 11 has a first surface 11a in contact with the upper surface 10a of the first upper molded heat insulating material 10 and a second surface 11b on the opposite side of the first surface 11a. The first surface 11a faces downward. The second surface 11b faces upward. By forming the upper surface 10a flat, the vacuum heat insulating material 11 can be arranged without bending the vacuum heat insulating material 11. The second surface 11b faces the lower surface 12a of the second upper molded heat insulating material 12. In the state where the first upper molded heat insulating material 10, the vacuum heat insulating material 11, and the second upper molded heat insulating material 12 are combined, a space 14 is formed between the second surface 11b and the lower surface 12a.

In the present embodiment, the vacuum heat insulating material 11 is covered with the second upper molded heat insulating material 12, so that the vacuum heat insulating material 11 is not exposed. As a result, the following effects can be obtained. It is possible to surely prevent the vacuum heat insulating material 11 from being damaged during manufacturing and assembling. If the outer cover material of the vacuum heat insulating material 11 is scratched, pinholes are generated and the vacuum state cannot be maintained, and the vacuum heat insulating material 11 cannot exhibit its original heat insulating properties. On the other hand, in the present embodiment, the vacuum heat insulating material 11 can be reliably prevented from being damaged, so that the vacuum heat insulating material 11 can surely exhibit the original heat insulating property. Therefore, the heat retention performance of the hot water storage tank 2 can be surely improved.

In the present embodiment, the following effects can be obtained by forming the space 14. It is possible to prevent the vacuum heat insulating material 11 from being worn due to contact between the second upper molded heat insulating material 12 and the vacuum heat insulating material 11 due to vibration during transportation of the hot water storage type water heater 1. Therefore, the vacuum heat insulating material 11 can be more reliably prevented from being scratched. In addition, heat conduction from the vacuum heat insulating material 11 to the second upper molded heat insulating material 12 can be prevented. As a result, the heat of the hot water storage tank 2 can be reliably suppressed from being conducted to the outer case top plate 16, so that the heat retention performance of the hot water storage tank 2 can be further improved.

In the present embodiment, the first surface 11a of the vacuum heat insulating material 11 is in contact with the upper surface 10a as a whole. The shape of the upper surface 10a and the vacuum heat insulating material 11 may be, for example, circular or polygonal having a diameter similar to the diameter of the hot water storage tank 2. The vacuum heat insulating material 11 may be divided into a plurality of regions.

In the present embodiment, the second surface 11b of the vacuum heat insulating material 11 is generally separated from the lower surface 12a of the second upper molded heat insulating material 12. As a result, the contact between the second upper molded heat insulating material 12 and the vacuum heat insulating material 11 can be more reliably prevented, so that the wear and scratches of the vacuum heat insulating material 11 can be more reliably prevented.

As shown in FIG. 2, the distance between the second surface 11b and the lower surface 12a, that is, the thickness of the space 14 is L. L is preferably 1 mm or more, and more preferably 3 mm or more. Thereby, the contact between the second upper molded heat insulating material 12 and the vacuum heat insulating material 11 can be more reliably prevented. L is preferably 10 mm or less, more preferably 5 mm or less. As a result, an increase in dead space can be suppressed.

As shown in FIG. 3, the first upper molded heat insulating material 10 has contact portions 10e and 10f in contact with the second upper molded heat insulating material 12. The contact portions 10e and 10f are formed on the outer periphery of the upper surface 10a. The contact portion 10e is a surface formed at a position lower than the upper surface 10a. The contact portion 10f is an outer peripheral surface formed by a step between the upper surface 10a and the contact portion 10e.

The second upper molded heat insulating material 12 has contact portions 12b and 12c in contact with the first upper molded heat insulating material 10. The contact portion 12b is a surface in contact with the contact portion 10e. When the contact portion 12b comes into contact with the contact portion 10e, the load of the second upper molded heat insulating material 12 can be received by the first upper molded heat insulating material 10. The contact portion 12c is an inner peripheral surface in contact with the contact portion 10f. When the contact portion 12c comes into contact with the contact portion 10f, the horizontal position of the second upper molded heat insulating material 12 can be held at an appropriate position.

In the present embodiment, the contact area between the first upper molded heat insulating material 10 and the vacuum heat insulating material 11 is larger than the contact area between the first upper molded heat insulating material 10 and the second upper molded heat insulating material 12. As a result, the following effects can be obtained. The vacuum heat insulating material 11 having a lower thermal conductivity than the second upper molded heat insulating material 12 comes into contact with the first upper molded heat insulating material 10 with a larger contact area, whereby the first upper molded heat insulating material 10 to the second upper molded heat insulating material 10 are contacted. The heat conduction to the material 12 can be reduced more reliably. As a result, the heat retention performance of the hot water storage tank 2 can be further improved.

In the present embodiment, the second upper molded heat insulating material 12 has an upper surface 12d in contact with the inner surface, that is, the lower surface of the outer case top plate 16. Assuming that the upper surface 12d is not in contact with the inner surface of the outer case top plate 16, there are the following possibilities. It is assumed that the hot water storage type water heater 1 should be dropped during transportation. At the moment when the hot water storage type water heater 1 falls and the hot water storage tank leg 6 lands on the ground or the floor, the descent of the hot water storage tank 2 directly supported by the hot water storage tank leg 6 stops suddenly. On the other hand, the outer case side plate 15 and the outer case top plate 16 indirectly supported via the bottom plate 13 cannot be stopped at the moment of landing, and the upper surface 12d of the second upper molded heat insulating material 12 and the outer case top. It tries to continue to descend further downward by the distance from the inner surface of the plate 16. As a result, one or both of the outer case side plate 15 and the bottom plate 13 may be distorted, leading to plastic deformation.

On the other hand, according to the present embodiment, the first upper molded heat insulating material is formed at the moment when the hot water storage tank leg 6 of the hot water storage type water heater 1 that has fallen lands on the ground or the floor and the descent of the hot water storage tank 2 suddenly stops. 10 and the second upper molded heat insulating material 12 can support the outer case top plate 16. That is, the outer case side plate 15 and the outer case top plate 16 can be further lowered by the first upper molded heat insulating material 10 and the second upper molded heat insulating material 12 to stop the lowering. Therefore, since the stress applied to the outer case side plate 15 and the bottom plate 13 can be relaxed, the deformation of the outer case side plate 15 and the bottom plate 13 can be reliably prevented. Further, in the present embodiment, the following effects can be obtained by providing the space 14. Even when the second upper molded heat insulating material 12 that receives force from the outer case top plate 16 is deformed when the hot water storage type water heater 1 is dropped, the contact between the second upper molded heat insulating material 12 and the vacuum heat insulating material 11 is more reliable. Can be prevented. Therefore, the vacuum heat insulating material 11 can be more reliably prevented from being scratched.

It is desirable that the contact area between the upper surface 12d of the second upper molded heat insulating material 12 and the inner surface of the outer case top plate 16 is larger than the area of a circle equal to the diameter of the hot water storage tank 2. As a result, the stress applied to the outer case top plate 16 when the hot water storage type water heater 1 is dropped can be sufficiently relaxed.

It is desirable that the second upper molded heat insulating material 12 has a hardness or elastic modulus higher than that of the first upper molded heat insulating material 10. As a result, the following effects can be obtained. It is possible to more reliably suppress the deformation of the second upper molded heat insulating material 12 when the second upper molded heat insulating material 12 receives the outer case side plate 15 and the outer case top plate 16 when the hot water storage type water heater 1 is dropped. Therefore, since the amount of lowering of the outer case side plate 15 and the outer case top plate 16 with respect to the hot water storage tank 2 is further reduced, deformation of the outer case side plate 15 and the bottom plate 13 can be more reliably prevented.

Since there is always hot water in the upper part of the hot water storage tank 2 and the temperature is high, it is important to suppress heat dissipation loss from the upper surface of the hot water storage tank 2 as much as possible. From this point of view, it is desirable to arrange the vacuum heat insulating material 11 having a low thermal conductivity on the upper part of the hot water storage tank 2. Since the vacuum heat insulating material 11 is usually manufactured in a flat plate shape, the vacuum heat insulating material 11 must be processed when it is used in a spherical surface and a place having a pipe connection port such as the upper part of a hot water storage tank 2. On the other hand, in the present embodiment, by arranging the vacuum heat insulating material 11 on the upper surface 10a of the first upper molded heat insulating material 10, the processing of the vacuum heat insulating material 11 becomes unnecessary.

It is desirable that the first upper molded heat insulating material 10 has a lower thermal conductivity than the second upper molded heat insulating material 12. Since the heat conduction from the first upper molded heat insulating material 10 to the second upper molded heat insulating material 12 can be sufficiently reduced by the vacuum heat insulating material 11 and the space 14, the temperature of the second upper molded heat insulating material 12 does not become so high. Therefore, even if the second upper molded heat insulating material 12 has a higher thermal conductivity than the first upper molded heat insulating material 10, heat is dissipated from the second upper molded heat insulating material 12 to the outer case top plate 16 by heat conduction. Loss is well suppressed.

In the present embodiment, the second upper molded heat insulating material 12 is formed with a ventilation passage 12e. The air passage 12e penetrates between the space 14 and the upper surface 12d. The air passage 12e communicates the space 14 with the space outside the first upper molded heat insulating material 10 and the second upper molded heat insulating material 12. By providing the ventilation passage 12e, the following effects can be obtained. The volume of the space 14 is reduced during the assembling work in which the first upper molded heat insulating material 10 is combined with the second upper molded heat insulating material 12. At that time, the air in the space 14 is discharged to the outside through the ventilation passage 12e. Therefore, the work of combining the first upper molded heat insulating material 10 with the second upper molded heat insulating material 12 can be smoothly carried out. On the other hand, assuming that there is no ventilation passage 12e, when the volume of the space 14 decreases, it is difficult for the air in the space 14 to escape, so that the pressure in the space 14 increases, and the first upper molding heat insulating material 10 is molded in the second upper part. The work of combining the heat insulating material 12 may be difficult. In the illustrated configuration, the air passage 12e is formed in the second upper molded heat insulating material 12, but the air passage may be formed in the first upper molded heat insulating material 10, or the first upper molded heat insulating material 10 and the second upper part may be formed. A ventilation path may be formed by forming a partial gap between both of the molded heat insulating materials 12 or both.

The first upper molded heat insulating material 10 has a recess 10 g formed in the contact portion 10e. The second upper molded heat insulating material 12 has a convex portion 12f formed on the contact portion 12b. When the second upper molded heat insulating material 12 is properly combined with the first upper molded heat insulating material 10, the convex portion 12f is inserted into the concave portion 10g. The concave portion 10g and the convex portion 12f are examples of positioning means for indicating the position where the first upper molded heat insulating material 10 is combined with the second upper molded heat insulating material 12. By providing such a positioning means, the work of combining the first upper molded heat insulating material 10 with the second upper molded heat insulating material 12 can be carried out more smoothly. Positioning means may be provided only on either one of the first upper molded heat insulating material 10 and the second upper molded heat insulating material 12.

1 Hot water storage type water supply machine, 2 Hot water storage tank, 2a Hot water inlet, 3 Outer case, 4 Hot water supply piping, 5 Hot water storage tank support piece, 6 Hot water storage tank leg, 7 Lower molded heat insulating material, 8 Front molded heat insulating material, 9 Rear molded Insulation material, 10 first upper molded insulation material, 10a top surface, 10b concave curved surface, 10c recess, 10d hollow part, 10e, 10f contact part, 10g recess, 11 vacuum heat insulating material, 11a first surface, 11b second surface, 12 Second upper molded heat insulating material, 12a lower surface, 12b, 12c contact part, 12d upper surface, 12e air passage, 12f convex part, 13 bottom plate, 14 space, 15 outer case side plate, 16 outer case top plate, 17 valves

Claims (8)

Hot water storage tank and
A first molded heat insulating material that covers the upper part of the hot water storage tank and has an upper surface,
A vacuum heat insulating material having a first surface in contact with the upper surface of the first molded heat insulating material and a second surface opposite to the first surface.
A contact portion in contact with the first mold heat insulating material, possess a lower surface facing the second surface of the vacuum insulating material, a second molding insulation material covering the vacuum heat insulating material,
An outer case for storing the hot water storage tank, the first molded heat insulating material, the vacuum heat insulating material, and the second molded heat insulating material.
With
Space there Ri between the lower surface of the second surface and the second mold heat insulating material of the vacuum heat insulating material,
The contact part that is in contact with the first mold heat insulating material, the second mold heat insulating material storage type water heater, wherein said first molded thermal insulator Ru under a load of. The hot water storage type water heater according to claim 1, wherein the second molded heat insulating material has an upper surface in contact with the inner surface of the top plate of the outer case. The hot water storage type water heater according to claim 1 or 2, wherein the contact area between the first molded heat insulating material and the vacuum heat insulating material is larger than the contact area between the first molded heat insulating material and the second molded heat insulating material. .. The hot water storage type water heater according to any one of claims 1 to 3, wherein the first molded heat insulating material has a lower thermal conductivity than the second molded heat insulating material. The hot water storage type water heater according to any one of claims 1 to 4, wherein the second molded heat insulating material has a hardness or elastic modulus higher than that of the first molded heat insulating material. Claims 1 to 5 wherein the first molded heat insulating material is composed of two or more parts, and a pipe connected to the hot water storage tank passes between the two parts constituting the first molded heat insulating material. The hot water storage type water heater described in any one of the items. The hot water storage type water heater according to any one of claims 1 to 6, which has a ventilation path that communicates the space with the space outside the first molded heat insulating material and the second molded heat insulating material. Claim 1 according to claim 1, wherein a positioning means indicating a position where the first molded heat insulating material and the second molded heat insulating material are combined is provided in at least one of the first molded heat insulating material and the second molded heat insulating material. The hot water storage type water heater according to any one of items 7.

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