JP6136924B2 - Hot water storage water heater - Google Patents

Description

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

  2. Description of the Related Art Hot water storage water heaters that store hot water in a hot water storage tank, take out the hot water from the hot water storage tank when necessary, and supply it to a hot water supply terminal are widely used. The hot water storage tank is stored in an outer case serving as an exterior. In order to suppress heat loss, the hot water storage tank is housed in the outer case while being covered with a heat insulating material. In general, the hot water storage tank has a cylindrical shape, and the outer case has a rectangular parallelepiped shape. For this reason, a space is generated between the inner wall of the outer case and the tank heat insulating material at the ridge of the outer case. In this space, a temperature gradient is generated by heat conduction and heat transfer from the hot water storage tank, and natural convection of air is generated. Due to this natural convection, heat radiation from the surface of the tank heat insulating material is promoted, the heat flux from the hot water storage tank increases, and there is a problem that heat radiation loss increases.

  The following Patent Document 1 includes a medium and high temperature pipe component heat insulating material that covers at least a part of the pipe and parts that are at a medium to high temperature, and a part of the pipe and components are interposed between the medium and high temperature pipe component heat insulating material and the tank heat insulating material. In a hot water storage type hot water heater in which a medium and high temperature pipe component heat insulating material is fixed to a tank heat insulating material in a sandwiched state, a technique of disposing a medium and high temperature pipe component heat insulating material so as to fill a gap where natural convection occurs is disclosed.

JP 2011-117672 A

  In the hot water storage-type water heater disclosed in the above publication, the occurrence of natural convection can be suppressed at locations where the intermediate / high-temperature pipe component heat insulating material is disposed, but the occurrence of natural convection cannot be suppressed at other locations. For this reason, an increase in heat dissipation loss due to natural convection cannot be sufficiently suppressed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hot water storage type hot water heater capable of reducing a heat dissipation loss from a hot water storage tank.

A hot water storage type hot water heater according to the present invention includes a cylindrical hot water storage tank, a tank heat insulating material that closely covers the hot water storage tank, a circuit device that constitutes a hot water supply circuit through which the hot water passes, And an air layer on the surface of the tank heat insulating material facing the left and right ridges on the rear surface side of the outer case, wherein the circuit device is disposed between the front plate of the outer case and the tank heat insulating material. of thickness, Ri thickness der natural air convection is suppressed, installed inside the ridge, provided with a partition plate which is inclined with respect to the face plate and a side plate after the outer case, the air layer, the partition a plate, a shall be formed in the gap between the surface of the tank insulation material facing the ridge.

  According to the present invention, it is possible to reduce heat dissipation loss from the hot water storage tank.

It is the external view (perspective view) which looked at the hot water storage type water heater of Embodiment 1 of this invention from the front side. It is sectional drawing which cut | disconnected the hot water storage type water heater of Embodiment 1 of this invention by the horizontal surface. It is sectional drawing which cut | disconnected the hot water storage type water heater of Embodiment 2 of this invention by the horizontal surface.

  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.
1 is an external view (perspective view) of a hot water storage type water heater according to Embodiment 1 of the present invention as viewed from the front side. As shown in FIG. 1, the hot water storage type water heater 1 of the first embodiment includes an outer case 2 and a plurality of (three in the illustrated configuration) support legs 3 that fix the outer case 2 on the installation surface. Prepare. The shape of the outer case 2 is generally a rectangular parallelepiped shape. The outer case 2 is preferably made of a metal material. FIG. 2 is a cross-sectional view of the hot water storage type water heater 1 of Embodiment 1 cut along a horizontal plane. The position of the cut surface in FIG. 2 is substantially in the middle of the outer case 2 in the vertical direction. However, FIG. 2 shows a state where the hot water storage tank 4 is not cut. In FIG. 2, the lower side is the front surface of the hot water storage type water heater 1, and the upper side is the rear surface of the hot water storage type water heater 1.

  As shown in FIGS. 1 and 2, the outer case 2 includes a front plate 2a that forms a front surface, a left side plate 2b that forms a left side, a rear plate 2c that forms a rear surface, a right side plate 2d that forms a right side, and an upper surface. 2g for forming the bottom plate, a bottom plate (not shown) for forming the bottom surface, and the like. A hot water storage tank 4 is accommodated in the outer case 2. The shape of the hot water storage tank 4 is generally cylindrical. The hot water storage tank 4 is arranged in a posture in which the axial direction is the vertical direction. Inside the outer case 2, tank heat insulating materials 5 and 6 and circuit devices 7, 8 and 9 described later are further accommodated. The hot water storage type water heater 1 includes heating means (for example, a heat pump device, an electric heater, a solar heat collector, etc.) that generates hot water by heating the water in the hot water storage tank 4, but illustration thereof is omitted. This heating means may be provided in the outer case 2 or in the hot water storage tank 4, or may be configured separately from the outer case 2 and connected to the outer case 2 by piping.

  As shown in FIG. 2, the hot water storage tank 4 is covered with tank heat insulating materials 5 and 6. The tank heat insulating material 5 covers the front half of the body portion of the hot water storage tank 4 in close contact with each other. The tank heat insulating material 6 closely covers and covers the half of the rear surface side of the body portion of the hot water storage tank 4. By combining the tank heat insulating materials 5 and 6, the entire circumference of the body portion of the hot water storage tank 4 is covered. Although not shown, the upper and lower parts of the hot water storage tank 4 are also covered with a heat insulating material.

  The inner wall of the rear plate 2c is close to the surface of the tank heat insulating material 6, and the close distance is a distance at which natural convection of air is suppressed. Regions other than the front portion of the inner walls of the left side plate 2b and the right side plate 2d are close to or in contact with the surfaces of the tank heat insulating materials 5 and 6.

  The circuit devices 7, 8, and 9 are disposed between the front plate 2 a and the tank heat insulating material 5. The circuit devices 7, 8, and 9 are devices that constitute a hot water supply circuit through which hot water passes, and are, for example, pipes, switching valves, pumps, and the like. In FIG. 2, the circuit devices 7, 8, and 9 are represented by hatched areas to simplify the illustration. The circuit device 7 is disposed in a space along the inner wall of the front plate 2a. The circuit device 8 is disposed in a space surrounded by the front portion of the inner wall of the left side plate 2b, the surface of the tank heat insulating material 5, and the circuit device 7. The circuit device 9 is disposed in a space surrounded by the front portion of the inner wall of the right side plate 2d, the surface of the tank heat insulating material 5, and the circuit device 7. All or part of the front plate 2a is removable. When maintaining the circuit devices 7, 8, 9, the work can be easily performed by removing all or part of the front plate 2 a.

  On the rear side of the inside of the outer case 2, circuit devices constituting the hot water supply circuit are not arranged. In the first embodiment, the circuit devices 7, 8, 9 constituting the hot water supply circuit are concentrated on the front side inside the outer case 2, so that maintenance can be easily performed. Further, the space surrounded by the surface of the tank heat insulating material 5, the inner wall of the front plate 2a, and the front side portions of the inner walls of the left side plate 2b and the right side plate 2d is filled with circuit devices 7, 8, and 9 to Can suppress the natural convection of air. For this reason, the heat transfer coefficient of the surface of the tank heat insulating material 5 falls, and the heat radiation from the hot water storage tank 4 can be suppressed.

  Chamfered portions 2 e and 2 f are formed on the left and right ridges on the rear surface side of the outer case 2. The chamfered portion 2e has a shape in which the corners of the left side plate 2b and the rear plate 2c are removed. The chamfered portion 2e has a flat plate shape that is inclined with respect to the left side plate 2b and the rear plate 2c. The chamfered portion 2f has a shape in which the corners of the right side surface plate 2d and the rear surface plate 2c are removed. The chamfered portion 2f has a flat plate shape inclined with respect to the right side surface plate 2d and the rear surface plate 2c. The inner walls of the chamfered portions 2e and 2f are close to the surface of the tank heat insulating material 6, and the close distance is a distance at which natural convection of air is suppressed. In the first embodiment, the chamfered portions 2e and 2f are formed in a flat plate shape, but the chamfered portions 2e and 2f may be formed in a curved surface shape.

  In the conventional hot water storage type hot water heater, a large space is generated between the left and right ridges on the rear surface side of the outer case and the surface of the tank heat insulating material facing the ridge. When natural convection of air occurs in this space, the heat transfer coefficient on the surface of the tank heat insulating material increases, the heat flux from the hot water storage tank increases, and the heat dissipation loss from the hot water storage tank increases. On the other hand, in this Embodiment 1, this heat dissipation loss can be suppressed as follows.

  When the thickness of the air layer on the surface of the tank heat insulating material 6 is thin, the occurrence of natural convection of air can be suppressed. In the first embodiment, the chamfered portions 2e and 2f are provided on the left and right ridges on the rear surface side of the outer case 2, so that the surface of the tank heat insulating material 6 facing the left and right ridge portions on the rear surface side of the outer case 2 is provided. The thickness of the air layer can be set to a thickness that suppresses natural convection of air. For this reason, since natural convection is reliably suppressed from occurring in the air layer on the surface of the tank heat insulating material 6 facing the left and right ridges on the rear surface side of the outer case 2, the heat transfer coefficient of the surface is reduced. The heat flux from the hot water storage tank 4 is reduced, and the heat radiation loss from the hot water storage tank 4 can be reduced. Moreover, the said effect can be achieved, without making the tank heat insulating material 6 of the part facing the right and left ridge part of the rear surface side of the outer case 2 excessively thick. For this reason, the cost and weight of the tank heat insulating material 6 can be suppressed.

  The thickness of the air layer on the surface of the tank heat insulating material 6 facing the left and right ridges on the rear surface side of the outer case 2, that is, the gap between the inner walls of the chamfered portions 2 e and 2 f and the surface of the tank heat insulating material 6 is 3 mm or less. Is preferable, and 2 mm or less is more preferable. By setting it as such a range, it can suppress more reliably that natural convection generate | occur | produces in the air layer of the surface of the tank heat insulating material 6. FIG. The inner walls of the chamfered portions 2e and 2f and the surface of the tank heat insulating material 6 are basically close to each other, but may be partially in contact with each other. However, the contact area is very small compared to the proximity area (for example, 5% or less).

Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 3. 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. Is omitted. FIG. 3 is a cross-sectional view of hot water storage type water heater 1A according to Embodiment 2 of the present invention cut along a horizontal plane. The position of the cut surface in FIG. 3 is substantially in the middle of the outer case 2 in the vertical direction. However, FIG. 3 shows a state where the hot water storage tank 4 is not cut. In FIG. 3, the lower side is the front surface of the hot water storage type water heater 1 </ b> A, and the upper side is the rear surface of the hot water storage type water heater 1 </ b> A. The hot water storage type hot water heater 1A according to the second embodiment is different from the first embodiment in the shape of the outer case 2, but the external view is omitted.

  As shown in FIG. 3, at the left and right ridges on the rear surface side of the outer case 2 of the second embodiment, the left side plate 2b and the rear plate 2c are joined at a right angle, and the right side plate 2d and the rear plate 2c are at a right angle. To join. That is, the outer case 2 of the second embodiment has a general shape closer to a rectangular parallelepiped as compared with the first embodiment. For this reason, the manufacturing cost of the outer case 2 can be suppressed.

  Partition plates 10 and 11 are installed inside the left and right ridges on the rear surface side of the outer case 2. The partition plate 10 is disposed at the position of the bottom when the corner between the left side plate 2b and the rear plate 2c is the apex. The partition plate 10 has a flat plate shape inclined with respect to the left side plate 2b and the rear plate 2c. Both ends of the partition plate 10 are in contact with the inner wall of the left side plate 2b and the inner wall of the rear plate 2c. The partition plate 11 is disposed at the position of the bottom when the corner between the right side plate 2d and the rear plate 2c is the apex. The partition plate 11 has a flat plate shape inclined with respect to the right side plate 2d and the rear side plate 2c. Both ends of the partition plate 11 are in contact with the inner wall of the right side plate 2d and the inner wall of the rear plate 2c. One surface of the partition plates 10 and 11 is close to the surface of the tank heat insulating material 6, and the close distance is a distance at which natural convection of air is suppressed. In Embodiment 2, the partition plates 10 and 11 are formed in a flat plate shape, but the partition plates 10 and 11 may be formed in a curved surface shape.

  Spaces 12 and 13 are formed inside the left and right ridges on the rear surface side of the outer case 2. The space 12 is surrounded by the left side plate 2b, the rear plate 2c, and the partition plate 10. The space 13 is surrounded by the right side plate 2d, the rear plate 2c, and the partition plate 11.

  In the hot water storage type hot water heater 1A according to the second embodiment, even if natural convection of air occurs in the spaces 12 and 13, heat loss from the hot water storage tank 4 can be suppressed as follows. As described above, when the thickness of the air layer on the surface of the tank heat insulating material 6 is thin, the occurrence of natural convection of air can be suppressed. In the second embodiment, by providing the partition plates 10 and 11 inside the left and right ridges on the rear surface side of the outer case 2, the tank heat insulating material 6 facing the left and right ridge portions on the rear surface side of the outer case 2. The thickness of the air layer on the surface can be set to a thickness that suppresses natural convection of air. For this reason, natural convection is reliably suppressed from occurring in the air layer on the surface of the tank heat insulating material 6 facing the left and right ridges on the rear surface side of the outer case 2. As a result, the partition plates 10 and 11 and an air layer in which no natural convection occurs are interposed between the natural convection generated in the spaces 12 and 13 and the tank heat insulating material 6. Thereby, the heat transfer rate of the surface of the tank heat insulating material 6 decreases, the heat flux from the hot water storage tank 4 decreases, and the heat dissipation loss from the hot water storage tank 4 can be reduced. Moreover, the said effect can be achieved, without making the tank heat insulating material 6 of the part facing the right and left ridge part of the rear surface side of the outer case 2 excessively thick. For this reason, the cost and weight of the tank heat insulating material 6 can be suppressed. Moreover, since the external shape of the hot water storage type hot water heater 1A can be kept close to a general rectangular parallelepiped by configuring as in the second embodiment, the hot water storage installed along the outer wall of the house. Compared to the configuration of the first embodiment, which is a polygonal column shape as a water heater, the design can be improved and the shape can be easily adapted to the outer wall.

  The thickness of the air layer on the surface of the tank heat insulating material 6 facing the left and right ridges on the rear surface side of the outer case 2, that is, the gap between the partition plates 10 and 11 and the surface of the tank heat insulating material 6 is preferably 3 mm or less. 2 mm or less is more preferable. By setting it as such a range, it can suppress more reliably that natural convection generate | occur | produces in the air layer of the surface of the tank heat insulating material 6. FIG. The partition plates 10 and 11 and the surface of the tank heat insulating material 6 are basically close to each other, but may be partially in contact with each other. However, the contact area is very small compared to the proximity area (for example, 5% or less). The partition plates 10 and 11 are preferably made of a material having a lower thermal conductivity than that of the outer case 2. Thereby, the heat loss from the hot water storage tank 4 can be further reduced.

1,1A Hot water storage type water heater, 2 outer case, 2a front plate, 2b left side plate, 2c rear surface plate, 2d right side plate, 2e, 2f chamfered portion, 2g top plate, 3 support legs, 4 hot water storage tank, 5, 6 tank Thermal insulation, 7, 8, 9 Circuit equipment, 11 Partition plate, 12, 13 space

Claims (2)

A cylindrical hot water storage tank;
A tank insulation covering and covering the hot water storage tank;
Circuit equipment constituting a hot water supply circuit through which hot water passes,
An outer case for housing the hot water storage tank, the tank heat insulating material and the circuit device;
With
The circuit device is disposed between the front plate of the outer case and the tank heat insulating material,
The thickness of the air layer of the tank insulation material the surface of which faces the edge portion of the left and right rear side of the outer case, Ri thickness der natural air convection is suppressed,
It is installed inside the ridge, and includes a partition plate that is inclined with respect to a rear plate and a side plate of the outer case,
The air layer, the partition plate and the hot water storage type water heater that will be formed in a gap between the surface of the tank insulation facing the ridge.   The hot water storage type hot water supply device according to claim 1, wherein the thickness of the air layer is 3 mm or less.

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