JP2021099201A - Hot water storage type hot water supply device - Google Patents

Abstract

To provide a hot water storage type hot water supply device that uses a vacuum heat insulating material having excellent heat retaining property, as a heat insulating material covering a hot water storage tank.SOLUTION: A hot water storage type hot water supply device comprises a hot water storage tank 1, a first vacuum heat insulating material 27 covering at least a portion of a side part of the hot water storage tank 1, and a second vacuum heat insulating material 28 arranged on the outside in a radial direction (normal direction) with respect to the first vacuum heat insulating material 27. The first vacuum heat insulating material 27 and the second vacuum heat insulating material 28 are each formed of a core material and an outer skin material covering the whole circumference of the core material. The outer skin material of the second vacuum heat insulating material 28 is formed of a material having smaller thermal conductivity than the outer skin material of the first vacuum heat insulating material 27.SELECTED DRAWING: Figure 3

Description

The present invention relates to a hot water storage type hot water supply device.

This type of hot water storage type hot water supply device heats the water supplied from the bottom of the hot water storage tank to a high temperature by the heating device, and repeats the cycle of storing the water in the upper part of the hot water storage tank covered with the heat insulating material, so that the entire hot water storage tank is stored. Or store hot water in a part.

Then, when the user uses hot water to supply hot water, the temperature is adjusted to a predetermined temperature by mixing with unheated water and used at the hot water supply terminal.

Then, a vacuum heat insulating material is disclosed as a heat insulating material for covering the hot water storage tank (see, for example, Patent Document 1).

In FIG. 4, the vacuum heat insulating material is obtained by wrapping a core material 100 made of a fiber material such as silica with an upper outer skin material 101 such as aluminum and a lower outer skin material 102 to evacuate the inside, and then forming outer peripheral end faces 103 and 104. It is a heat insulating material that has been hermetically sealed by heat welding or the like, and its thermal conductivity is one-fifth to one-tenth that of urethane, which is a very high-performance heat insulating material.

Further, a vacuum heat insulating material in which the vacuum heat insulating material is double-wound is also disclosed (see, for example, Patent Document 2).

Japanese Unexamined Patent Publication No. 2009-192093 JP-A-2017-96539

However, in the conventional configuration, when the hot water storage tank is coated with this vacuum heat insulating material, a heat bridge phenomenon occurs in which heat circulates in the portion where the heat insulating material is heat-welded to the vacuum heat insulating material. When the foil is used, the influence is large, and there is a problem that the heat retention performance of the hot water storage tank is lowered.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a hot water storage type hot water supply device using a vacuum heat insulating material having excellent heat retention as a heat insulating material for covering a hot water storage tank.

In order to solve the above-mentioned conventional problems, the hot water storage type hot water supply device of the present invention relates to the first vacuum heat insulating material that covers at least a part of the hot water storage tank and the side portion of the hot water storage tank, and the first vacuum heat insulating material. A second vacuum heat insulating material arranged outside in the radial direction (normal direction) is provided, and the first vacuum heat insulating material and the second vacuum heat insulating material cover the core material and the entire circumference of the core material. It is formed from the outer skin material, and the outer skin material of the second vacuum heat insulating material is formed from a material having a value having a smaller thermal conductivity than the outer skin material of the first vacuum heat insulating material. It is to be.

As a result, the outer skin material of the second vacuum heat insulating material, which is arranged outside the radial direction (normal direction) with respect to the first vacuum heat insulating material, has a smaller thermal conductivity than the outer skin material of the first vacuum heat insulating material. Since it is formed from the material of the value, it is possible to suppress heat dissipation due to the heat bridge phenomenon in the outer skin material of the second vacuum heat insulating material located on the outermost side in the radial direction (normal direction) of the hot water storage tank.

Therefore, as a heat insulating material for covering the hot water storage tank, it is possible to provide a hot water storage type hot water supply device using a vacuum heat insulating material having excellent heat retention.

According to the present invention, as a heat insulating material for covering a hot water storage tank, it is possible to provide a hot water storage type hot water supply device using a vacuum heat insulating material having excellent heat retention.

Configuration diagram of the hot water storage type hot water supply device according to the first embodiment of the present invention (A) Side sectional view of the hot water storage tank unit according to the first embodiment of the present invention (b) AA sectional view of FIG. 2 (a). (A) Upper detailed view of the hot water storage tank according to the first embodiment of the present invention (b) Development view of the heat insulating configuration of the hot water storage tank according to the first embodiment of the present invention. Structural drawing of the conventional vacuum heat insulating material

According to the first invention, the hot water storage tank, the first vacuum heat insulating material covering at least a part of the side portion of the hot water storage tank, and the first vacuum heat insulating material are arranged outside in the radial direction (normal direction) with respect to the first vacuum heat insulating material. The second vacuum heat insulating material is provided, and the first vacuum heat insulating material and the second vacuum heat insulating material are formed of a core material and an outer skin material covering the entire circumference of the core material, and the second vacuum heat insulating material is provided. The outer skin material of the heat insulating material is a hot water storage type hot water supply device characterized in that it is formed of a material having a value having a smaller thermal conductivity than the outer skin material of the first vacuum heat insulating material.

As a result, the outer skin material of the second vacuum heat insulating material, which is arranged outside the radial direction (normal direction) with respect to the first vacuum heat insulating material, has a smaller thermal conductivity than the outer skin material of the first vacuum heat insulating material. Since it is formed from the material of the value, it is possible to suppress heat dissipation due to the heat bridge phenomenon in the outer skin material of the second vacuum heat insulating material located on the outermost side in the radial direction (normal direction) of the hot water storage tank.

Therefore, as a heat insulating material for covering the hot water storage tank, it is possible to provide a hot water storage type hot water supply device using a vacuum heat insulating material having excellent heat retention.

In the second invention, in particular, in the first invention, the side portion of the hot water storage tank is composed of the first vacuum heat insulating material and the molded heat insulating material arranged in the circumferential direction with respect to the first vacuum heat insulating material. It is covered, and the circumferential end of the first vacuum heat insulating material is covered with the molded heat insulating material, and the circumferential end of the second vacuum heat insulating material is in contact with at least the molded heat insulating material. It is characterized by being.

As a result, heat dissipation due to the heat bridge phenomenon at the circumferential end of the outer skin material of the first vacuum heat insulating material can be suppressed.

The third invention, in particular, in the first or second invention, the hot water storage tank is composed of the side portion and an upper portion and a lower portion having a substantially hemispherical outer surface joined to the side portion from the vertical direction. The first joint portion, which is the joint portion between the side portion and the upper portion, is not covered with the first vacuum heat insulating material, but is covered with a fiber-based heat insulating material or a foamed plastic-based heat insulating material. The second vacuum heat insulating material is arranged on the outside in the radial direction (normal direction) with respect to the fiber-based heat insulating material or the foamed plastic-based heat insulating material.

As a result, the outer skin material of the first vacuum heat insulating material can be prevented from being damaged due to contact with the first joint portion, and the first joint portion is covered with the fiber-based heat insulating material or the foamed plastic-based heat insulating material. Since the second vacuum heat insulating material is arranged on the outside thereof, it is possible to prevent damage due to contact of the outer skin material of the second vacuum heat insulating material with the first joint portion. Furthermore, heat dissipation from the first joint can be suppressed.

A fourth invention, in particular, in any one of the first to third inventions, the outer skin material of the first vacuum heat insulating material is formed from a material having a higher heat resistant temperature than the outer skin material of the second vacuum heat insulating material. It is characterized by being done.

As a result, the outer skin material of the first vacuum heat insulating material, which is in direct contact with the hot water storage tank in which the hot water is stored, is formed of a material having a higher heat resistant temperature than the outer skin material of the second vacuum heat insulating material. Overall durability can be improved as a heat insulating material for hot water storage tanks.

The fifth invention is characterized in that, in particular, in any one of the first to fourth inventions, the thickness of the second vacuum heat insulating material is smaller than the thickness of the first vacuum heat insulating material.

As a result, the outer skin material of the second vacuum heat insulating material is formed of a material having a smaller thermal conductivity than the outer skin material of the first vacuum heat insulating material, so that even if it is smaller than the thickness of the first vacuum heat insulating material. The heat insulating performance can be maintained, and the size of the hot water storage type hot water supply device can be reduced.

In the sixth invention, in particular, in any one of the first to fifth inventions, the outer skin material of the first vacuum heat insulating material is formed from aluminum foil, and the outer skin material of the second vacuum heat insulating material is a vapor-deposited film. It is characterized by being formed from.

Thereby, it is possible to realize that the outer skin material of the second vacuum heat insulating material is formed from a material having a value having a smaller thermal conductivity than the outer skin material of the first vacuum heat insulating material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment.

(Embodiment 1)
FIG. 1 is a diagram showing a configuration of a hot water storage type hot water supply device according to the first embodiment of the present invention.

In FIG. 1, the hot water storage type hot water supply device includes a hot water storage tank 1, a heat pump device which is a heating device 2 for heating the water in the hot water storage tank 1, and a first hot water discharge pipe 3 connected to the upper part of the hot water storage tank 1. Between the water supply pipe 5 connected to the lower part of the hot water storage tank 1 and the position where the first hot water supply pipe 3 and the water supply pipe 5 are connected, that is, connected to the substantially central part of the side of the hot water storage tank 1 in the height direction. The first mixing valve 6 in which the second hot water outlet pipe 4 and the water supply branch pipe 10 branched from the water supply pipe 5, and the first hot water outlet pipe 3 and the second hot water outlet pipe 4 are connected to the inlet side. And the second mixing valve 7 in which the hot water outlet pipe merging pipe 8 and the water supply branch pipe 10 connected to the outlet side of the first mixing valve 6 are connected to the inlet side, and the second mixing valve 7. It is provided with a mixing water pipe 9 connected to the outlet side.

Further, a hot water supply port 11 connected to the mixing water pipe 9, a medium temperature detecting means 12 for detecting the temperature of the hot water flowing through the second hot water outlet pipe 4, and a merging temperature detecting means for detecting the hot water temperature flowing through the hot water outlet pipe merging pipe 8. 13, the hot water supply temperature detecting means 14 for detecting the temperature of the hot water flowing through the mixed water pipe 9, the heat utilization hot water discharge pipe 21 connected to the upper part of the hot water storage tank 1, and the heat exchanger 20 connected to the heat utilization hot water discharge pipe 21. , The heat utilization return pipe 22 connected between the upper part of the hot water storage tank 1 and the position where the hot water storage tank 1 and the second hot water outlet pipe 4 are connected, the heat utilization terminal 23 connected to the heat exchanger 20, and the heat. It includes a pump 25 for adjusting the amount of hot water flowing through the utilization return pipe 22, and a heat utilization temperature detecting means 24 for detecting the temperature of the hot water flowing through the heat utilization terminal 23.

Further, the control device 26 for controlling the operation operation of the hot water storage type hot water supply device is provided. Other than the heat pump device and the heat utilization terminal 23, which are the heating devices 2, they are arranged in the hot water storage tank unit 33.

The operation and operation of the hot water storage type hot water supply device configured as described above will be described below.

As a basic operation, the hot water storage tank 1 is filled with a large amount of low-temperature water before boiling, and when the operation is started, the water in the hot water storage tank 1 is sent to the heat pump device 2 via the boiling pipe 16. It is heated and returned to the hot water storage tank 1. As a result, hot water is stored in the hot water storage tank 1.

After hot water is stored in the hot water storage tank 1, when using hot water supply, the hot water of the hot water storage tank 1 that is discharged through the first hot water pipe 3 and the second hot water pipe 4 is used as the first mixing valve 6. The hot water in the hot water outlet pipe merging pipe 8 and the water supply from the water supply branch pipe 10 are mixed by the second mixing valve 7 to the hot water supply set temperature and supplied to the hot water supply port 11. Further, water corresponding to the amount of hot water used for hot water supply flows in from the lower part of the hot water storage tank 1 through the water supply pipe 5.

Further, when the water of the heat utilization terminal 23 such as a bath is heated by the heat exchanger 20, the heat exchanger 20 and heat are generated from the heat utilization hot water pipe 21 connected to the upper part of the hot water storage tank 1 by the operation of the pump 25. The heated medium-temperature water returns to the hot water storage tank 1 from the exchanger 20 to the heat utilization return pipe 22.

After that, when hot water is supplied, since the second hot water outlet pipe 4 is connected to a position below the heat utilization return pipe 22, the medium hot water generated by the heat utilization return pipe 22 is preferentially used. The influence of the temperature distribution change due to the heat utilization return pipe 22 can be removed.

Further, since the heat utilization return pipe 22 is connected to the upper part of the hot water storage tank 1 and the temperature of the lower part of the hot water storage tank 1 is maintained at the water supply temperature, medium hot water circulates in the heating device at the time of boiling to improve efficiency. It will not decrease.

In this way, the connection position of the heat utilization return pipe 22 with the hot water storage tank 1 is set higher than the connection position of the second hot water discharge pipe 4 with the hot water storage tank 1, so that the medium hot water generated by the heat utilization return pipe 22 is generated. Since it is possible to remove the influence of the above and prevent a decrease in efficiency at the time of boiling, good usability and high energy saving can be realized.

Further, it is preferable that the refrigerating cycle of the heat pump device 2 uses carbon dioxide as a refrigerant and operates at a pressure exceeding the critical pressure. By using carbon dioxide as a refrigerant, the boiling temperature can be raised.

FIG. 2A is a side sectional view of the hot water storage tank unit according to the first embodiment of the present invention. FIG. 2B is a cross-sectional view taken along the line AA of FIG. 2A.

Further, FIG. 3A is a detailed upper view of the hot water storage tank according to the first embodiment of the present invention. FIG. 3B is a development view of the heat insulating configuration of the hot water storage tank according to the first embodiment of the present invention.

Hereinafter, the heat insulating configuration of the hot water storage tank 1 will be described with reference to FIGS. 2 (a), 2 (b), 3 (a), and 3 (b).

The hot water storage tank 1 is composed of a hot water storage tank upper portion 1a, a hot water storage tank side portion 1b, and a hot water storage tank lower portion 1c, each of which is welded to form the hot water storage tank 1.

The upper part 1a of the hot water storage tank is covered with the heat insulating material 29 at the upper part of the tank, and the lower part 1c of the hot water storage tank is covered with the heat insulating material 31 at the lower part of the tank.

Further, in the hot water storage tank side portion 1b, the tank side heat insulating material 30 is arranged at the portion where the second hot water discharge pipe 4 and the heat utilization return pipe 22 are connected, and the second hot water discharge pipe 4 and the heat are generated. The utilization return pipe 22 is configured to penetrate the tank side heat insulating material 30.

The tank upper heat insulating material 29, the tank side heat insulating material 30, and the tank lower heat insulating material 31 are made of styrofoam or urethane foam, which is easy to process.

On the other hand, in the portion 1b of the hot water storage tank side where the second hot water discharge pipe 4 and the heat utilization return pipe 22 are not connected, the second hot water discharge pipe 4 and the heat utilization return pipe 22 are connected in the circumferential direction of the hot water storage tank 1. The first vacuum heat insulating material 27 is arranged from one end side to the other end side of the above, or from the vicinity thereof, and further, on the outside in the radial direction (normal direction) with respect to the first vacuum heat insulating material 27. , The second vacuum heat insulating material 28 is arranged.

Here, the first vacuum heat insulating material 27 and the second vacuum heat insulating material 28 are formed of a core material and an outer skin material that covers the entire circumference of the core material.

The outer skin material of the first vacuum heat insulating material 27 is formed of aluminum foil, and the outer skin material of the second vacuum heat insulating material 28 is formed of a thin-film vapor deposition film.

That is, the outer skin material of the second vacuum heat insulating material 28 is formed of a material having a lower thermal conductivity than the outer skin material of the first vacuum heat insulating material 27.

For reference, the thermal conductivity of the outer skin material is about 238 [W / m · K] for the aluminum foil of the first vacuum heat insulating material 27 and about 20.6 [W / m · K] for the aluminum vapor-deposited film of the second vacuum heat insulating material 28. m ・ K].

As a result, the outer skin material of the second vacuum heat insulating material 28, which is arranged outside the radial direction (normal direction) with respect to the first vacuum heat insulating material 27, conducts heat more than the outer skin material of the first vacuum heat insulating material 27. Since it is formed of a material having a small ratio, it is possible to suppress heat dissipation due to the heat bridging phenomenon in the outer skin material of the second vacuum heat insulating material 28 located on the outermost side in the radial direction (normal direction) of the hot water storage tank 1.

Further, if only the surface of the second vacuum heat insulating material 28 in contact with the first vacuum heat insulating material 27 is the vapor-deposited film, the effect of suppressing heat dissipation by the heat bridge can be obtained.

The upper end of the first vacuum heat insulating material 27 is covered with the side portion of the hot water storage tank 1, the second vacuum heat insulating material 28, and the tank upper heat insulating material 29. The downward end of the first vacuum heat insulating material 27 is covered with the side portion of the hot water storage tank 1, the second vacuum heat insulating material 28, and the tank lower heat insulating material 31.

Further, both ends of the first vacuum heat insulating material 27 in the circumferential direction are also covered with the tank side heat insulating material 30, and both ends of the second vacuum heat insulating material 28 in the circumferential direction are at least the tank side heat insulating material 30. Is in contact with.

As a result, the height and circumferential ends of the outer skin material of the first vacuum heat insulating material 27, that is, the entire circumference of the outer skin material are insulated, so that the heat bridge phenomenon in the outer skin material of the first vacuum heat insulating material 27 It is possible to suppress heat dissipation due to.

The hot water storage tank 1 includes a first joint portion 34 which is a joint portion between the hot water storage tank side portion 1b and the hot water storage tank upper portion 1a, and a second joint portion 35 which is a joint portion between the hot water storage tank side portion 1b and the hot water storage tank lower portion 1c. ing.

Since the hot water storage type hot water supply device according to the first embodiment of the present invention is a temperature stratification type, the temperature in the upper part is often higher. Therefore, since the outer periphery of the hot water storage tank side portion 1b is covered with the hot water storage tank upper portion 1a and then welded, the first joint portion 34 protrudes from the outer surface of the hot water storage tank 1.

Therefore, the first joint portion 34, which is the joint portion between the hot water storage tank side portion 1b and the hot water storage tank upper portion 1a, is not covered by the first vacuum heat insulating material 27, but is a fiber-based heat insulating material (for example, the tank welded portion heat insulating material 32). It is covered with glass wool) or foamed plastic heat insulating material (for example, styrofoam or urethane foam), and is radial (normal direction) with respect to the fiber heat insulating material or foamed plastic heat insulating material which is the tank weld heat insulating material 32. ), The second vacuum heat insulating material 28 is arranged.

As a result, the first vacuum heat insulating material 27 can be prevented from being damaged due to contact with the first joint portion 34 of the outer skin material, and the first joint portion 34 is covered with the fiber-based heat insulating material or the foamed plastic-based heat insulating material. Since the second vacuum heat insulating material 28 is arranged on the outside thereof, it is possible to prevent the second vacuum heat insulating material 28 from being damaged due to contact with the first joint portion 34 of the outer skin material.

Further, the first joint portion 34 is covered with a fiber-based heat insulating material (for example, glass wool) or a foamed plastic-based heat insulating material (for example, styrofoam or urethane foam) which is a tank welded portion heat insulating material 32, thereby storing hot water. Since it protrudes from the outer surface of the tank 1, it is possible to suppress heat dissipation from the first joint portion 34, which is a joint portion between the hot water storage tank side portion 1b and the hot water storage tank upper portion 1a, for which it is difficult to arrange the heat insulating material.

Further, the outer skin material of the first vacuum heat insulating material 27, which is in direct contact with the hot water storage tank 1 in which the hot water is stored, is formed of a material having a higher heat resistant temperature than the outer skin material of the second vacuum heat insulating material 28. Therefore, the overall durability can be improved as a heat insulating material for the hot water storage tank.

For reference, the heat resistant temperature of the first vacuum heat insulating material 27 whose outer skin material is made of aluminum foil is about 240 ° C., and the heat resistant temperature of the second vacuum heat insulating material 28 whose outer skin material is made of thin-film vapor deposition film is about 180 ° C. ℃.

Further, the thickness of the second vacuum heat insulating material 28 is smaller than the thickness of the first vacuum heat insulating material 27, but the outer skin material of the second vacuum heat insulating material 28 is more heat conductive than the outer skin material of the first vacuum heat insulating material 27. Since it is formed from a material having a small ratio, the heat insulating performance can be maintained even if the thickness is smaller than the thickness of the first vacuum heat insulating material 27, and the size of the hot water storage type hot water supply device can be realized.

The first vacuum heat insulating material 27 in the first embodiment of the present invention is divided into a plurality of heat insulating materials 27 in the vertical direction, but one may be used.

As described above, according to the hot water storage type hot water supply device according to the first embodiment of the present invention, a vacuum heat insulating material having excellent heat retention can be realized as the heat insulating material for covering the hot water storage tank.

As described above, since the hot water storage type hot water supply device according to the present invention uses the vacuum heat insulating material having excellent heat retention as the heat insulating material covering the hot water storage tank, it is used not only for the hot water storage type hot water supply device for home use but also for business use. It can also be applied to hot water storage type hot water supply devices such as.

1 Hot water storage tank 1a Hot water storage tank upper part 1b Hot water storage tank side 1c Hot water storage tank lower part 2 Heating device (heat pump device)
3 1st hot water supply pipe 4 2nd hot water supply pipe 5 Water supply pipe 6 1st mixing valve 7 2nd mixing valve 8 Hot water outlet pipe confluence pipe 9 Mixing water pipe 10 Water supply branch pipe 11 Hot water supply port 12 Medium temperature detection means 13 Confluence temperature detection Means 14 Hot water supply temperature detection means 16 Boiling pipe 20 Heat exchanger 21 Heat utilization hot water discharge pipe 22 Heat utilization return pipe 23 Heat utilization terminal 24 Heat utilization temperature detection means 25 Pump 26 Control device 27 First vacuum insulation 28 Second vacuum insulation Material 29 Upper tank heat insulating material 30 Tank side heat insulating material 31 Tank lower heat insulating material 32 Tank welded heat insulating material 33 Hot water storage tank unit 34 First joint 35 Second joint

Claims (6)

The first vacuum heat insulating material that covers at least a part of the hot water storage tank and the side portion of the hot water storage tank,
The second vacuum heat insulating material arranged outside the radial direction (normal direction) with respect to the first vacuum heat insulating material,
With
The first vacuum heat insulating material and the second vacuum heat insulating material are formed of a core material and an outer skin material that covers the entire circumference of the core material.
The hot water storage type hot water supply device, wherein the outer skin material of the second vacuum heat insulating material is formed of a material having a value lower in thermal conductivity than the outer skin material of the first vacuum heat insulating material. The side portion of the hot water storage tank is covered with the first vacuum heat insulating material and the molded heat insulating material arranged in the circumferential direction with respect to the first vacuum heat insulating material, and the circumferential direction of the first vacuum heat insulating material. The hot water storage according to claim 1, wherein the end portion of the second vacuum heat insulating material is covered with the molded heat insulating material, and the peripheral end portion of the second vacuum heat insulating material is in contact with at least the molded heat insulating material. Type hot water supply device. The hot water storage tank is composed of the side portion and an upper portion and a lower portion having a substantially hemispherical outer surface joined to the side portion from the vertical direction, and is a joint portion between the side portion and the upper portion. The joint portion is not covered with the first vacuum heat insulating material, but is covered with the fiber-based heat insulating material or the foamed plastic-based heat insulating material, and has a diameter with respect to the fiber-based heat insulating material or the foamed plastic-based heat insulating material. The hot water storage type hot water supply device according to claim 1 or 2, wherein the second vacuum heat insulating material is arranged outside the direction (normal direction). The one according to any one of claims 1 to 3, wherein the outer skin material of the first vacuum heat insulating material is formed of a material having a heat resistance temperature higher than that of the outer skin material of the second vacuum heat insulating material. Hot water storage type hot water supply device The hot water storage type hot water supply device according to any one of claims 1 to 4, wherein the thickness of the second vacuum heat insulating material is smaller than the thickness of the first vacuum heat insulating material. The hot water storage type according to any one of claims 1 to 5, wherein the outer skin material of the first vacuum heat insulating material is an aluminum foil, and the outer skin material of the second vacuum heat insulating material is a vapor-deposited film. Hot water supply device.

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