JP2016044914A - Hot water storage tank unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage tank unit that has high heat insulation performance.SOLUTION: A hot water storage tank unit 20 comprises: a hot water storage tank 1; an outer box 2 housing the hot water storage tank 1; and a foam heat insulation material 4 packed between the hot water storage tank 1 and the outer box 2. The outer box 2 includes: a front plate 2a including packing holes for packing the foam heat insulation material 4; a rear plate 2b opposed to the front plate 2a; and a pair of side plates 2c and 2d surrounding the hot water storage tank 1 together with the front plate 2a and the rear plate 2b. Distances L2 between the side plates 2c and 2d and the hot water storage tank 1 are equal to or longer than a distance L1 between the rear plate 2b and the hot water storage tank 1.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hot water storage tank unit including a hot water storage tank.

A hot water storage tank unit having a hot water storage tank for storing hot water is known.
For example, Patent Document 1 describes a hot water storage type water heater provided with a plurality of molded heat insulating materials covering the periphery of a hot water storage tank.
Patent Document 2 describes a hot water storage tank unit including a hot water storage tank heat insulating material wound around a hot water storage tank and a hot water storage tank heat insulating cover installed in an outer box that houses the hot water storage tank.

JP 2011-106791 A Japanese Patent No. 4745269

  However, in the technique described in Patent Document 1, it is difficult to cover the entire outer surface of the hot water storage tank with a molded heat insulating material without a gap. That is, the technique described in Patent Document 1 has a problem that gaps are likely to occur between the plurality of molded heat insulating materials, and heat leakage from the hot water storage tank cannot be sufficiently prevented.

  Similarly, the technique described in Patent Document 2 also has a problem that a gap is easily generated in the hot water storage tank heat insulating material, and heat leakage from the hot water storage tank cannot be sufficiently prevented. In addition, in patent document 2, although it has the double structure which arrange | positions the hot water storage tank heat insulating material and the hot water storage tank heat insulation cover in the outer side of a hot water storage tank, there is room to further improve the heat insulation performance of a hot water storage tank unit.

  Then, this invention makes it a subject to provide the hot water storage tank unit with high heat insulation performance.

  In order to solve the above problems, a hot water storage tank unit according to the present invention includes a hot water storage tank, an outer box that houses the hot water storage tank, and a foam heat insulating material that is filled between the hot water storage tank and the outer box, The outer box includes a first wall portion having a filling hole for filling the foam heat insulating material, a second wall portion facing the first wall portion, the first wall portion, and the second wall portion. A pair of third wall portions surrounding the hot water storage tank together with the wall portions, and a distance between the third wall portion and the hot water storage tank is not less than a distance between the second wall portion and the hot water storage tank. It is characterized by.

  The hot water storage tank unit according to the present invention includes a hot water storage tank, an outer box that accommodates the hot water storage tank, a vacuum heat insulating material provided on an inner wall surface of the outer box, and the hot water storage tank and the vacuum heat insulating material. A foam heat insulating material filled in the outer casing, and the outer box has a first wall portion having a filling hole for filling the foam heat insulating material, a second wall portion facing the first wall portion, A pair of third wall portions surrounding the hot water storage tank together with the first wall portion and the second wall portion, and a distance between a location overlapping the third wall portion in the vacuum heat insulating material and the hot water storage tank is In the vacuum heat insulating material, the distance between the hot water storage tank and a portion overlapping the second wall portion is longer than the distance.

  Moreover, the hot water storage tank unit according to the present invention includes a hot water storage tank, an outer box that houses the hot water storage tank, a vacuum heat insulating material provided around the hot water storage tank, and the outer box and the vacuum heat insulating material. A foam insulation material to be filled, and the outer box has a first wall portion having a filling hole for filling the foam insulation material, a second wall portion facing the first wall portion, and A pair of third wall portions surrounding the hot water storage tank together with the first wall portion and the second wall portion, and the distance between the third wall portion and the vacuum heat insulating material is the second wall portion and the It is more than the distance with a vacuum heat insulating material, It is characterized by the above-mentioned.

  ADVANTAGE OF THE INVENTION According to this invention, the hot water storage tank unit with high heat insulation performance can be provided.

It is a whole block diagram of a water heater provided with the hot water storage tank unit which concerns on 1st Embodiment of this invention. It is a perspective view which shows the inside of a hot water storage tank unit. (A) is a cross-sectional view of the hot water storage tank unit, (b) is a partially enlarged view of a region M shown in (a), and (c) is a partially enlarged view of a region N1 shown in (a). It is explanatory drawing which shows the filling and foaming process of a foam heat insulating material, (a) is explanatory drawing which shows a mode that the foamed heat insulating material with which it filled wets to a backplate, (b) is a mode that a foam heat insulating material foams. (C) is explanatory drawing which shows a mode that the foaming heat insulating material has spread over the whole area of the clearance gap in an outer case. (A) is a cross-sectional view of the hot water storage tank unit according to the second embodiment of the present invention, (b) is a partially enlarged view of a region M shown in (a), and (c) is shown in (a). It is the elements on larger scale of the area | region N1. (A) is a cross-sectional view of the hot water storage tank unit according to the third embodiment of the present invention, (b) is a partially enlarged view of a region M shown in (a), and (c) is shown in (a). It is the elements on larger scale of the area | region N1. It is a cross-sectional view of the hot water storage tank unit according to the fourth embodiment of the present invention. It is a transverse cross section of the hot water storage tank unit concerning a 5th embodiment of the present invention. It is an explanatory view showing the filling and foaming process of the foam heat insulating material filled in the hot water storage tank unit according to the comparative example, (a) is an explanatory view showing a state where the filled foam heat insulating material spreads wet on the rear plate, (B) is explanatory drawing which shows a mode that a foaming heat insulating material foams, (c) is explanatory drawing which shows a mode that the void has arisen in the state which foaming of the foaming heat insulating material was complete | finished.

<< First Embodiment >>
<Configuration of water heater>
FIG. 1 is an overall configuration diagram of a water heater A including a hot water storage tank unit 20 according to the first embodiment.
The water heater A heats the hot water stored in the hot water storage tank 1 using the heat pump unit 10, mixes the water from the water supply source with the high temperature water stored in the hot water storage tank 1, and supplies it to the hot water supply terminal 19. It is a device to do. The water heater A includes a heat pump unit 10 and a hot water storage tank unit 20.

(Heat pump unit)
The heat pump unit 10 is a device that heats the low-temperature water flowing from the hot water storage tank 1 through the water inlet pipe 12 into high-temperature water and returns the high-temperature water to the hot water storage tank 1 through the hot water outlet pipe 14. Although not shown, the heat pump unit 10 includes a compressor, a condenser, a pressure reducing valve, and an evaporator, which are sequentially connected in an annular manner via a pipe. And a heat medium is circulated by a known heat pump cycle through the above-mentioned piping, and the low temperature water which flows in from the hot water storage tank 1 through the water intake pipe 12 is heated by the above-mentioned condenser.

(Hot water storage tank unit)
The hot water tank unit 20 stores hot water. The hot water storage tank unit 20 includes a hot water storage tank 1, an outer box 2 that accommodates the hot water storage tank 1, and a foam insulation 4 (dot-displayed portion) that is filled between the hot water storage tank 1 and the outer box 2. ing.

FIG. 2 is a perspective view showing the inside of the hot water storage tank unit 20. 2, the inside of the outer box 2 when the pipe cover K side is cut in the outer box 2 is illustrated. Moreover, in FIG. 2, illustration of the foam heat insulating material 4 (refer FIG. 1) and each piping was abbreviate | omitted.
The hot water storage tank 1 is a shell-like member that stores hot water, and the outer shape thereof has a cylindrical shape. More specifically, the hot water storage tank 1 includes a cylindrical body plate 1a, a hemispherical upper end plate 1b covering the upper opening of the body plate 1a, and a hemispherical lower end plate 1c covering the lower opening of the body plate 1a. It is equipped with. The upper end plate 1b and the lower end plate 1c are welded to the body plate 1a.
In addition, as a constituent material of the hot water storage tank 1, for example, a stainless steel plate can be used. The hot water storage tank 1 having such a configuration is installed such that its central axis is parallel to the vertical direction.

  On the outer peripheral surface of the hot water storage tank 1, temperature sensors Sa and Sb are installed at predetermined intervals in the vertical direction. The upper temperature sensor Sa is a sensor that detects the temperature of high-temperature water that has a small density and is likely to float. The lower temperature sensor Sb is a sensor that detects the temperature of the medium-temperature water that has a higher density and tends to settle than the high-temperature water. Three legs G are installed in the lower part of the hot water storage tank 1, and each leg G is fixed to the outer box 2 with bolts.

Returning again to FIG. 1, the description will be continued. In the lower part of the hot water storage tank 1, a water supply pipe 11 for supplying water from the water supply source to the hot water storage tank 1 and an inlet for introducing water (low temperature water) stored in the lower part of the hot water storage tank 1 into the heat pump unit 10. The water pipe 12 is connected.
A pump 13 is installed in the water inlet pipe 12. By driving the pump 13, low-temperature water stored in the lower part of the hot water storage tank 1 is pumped to the heat pump unit 10 through the water inlet pipe 12.

Further, at the upper part of the hot water storage tank 1, a hot water discharge pipe 14 for returning the high temperature water heated by the heat pump unit 10 to the hot water storage tank 1 and a hot water supply pipe 15 for taking out the high temperature water stored at the upper part of the hot water storage tank 1. And are connected. Incidentally, when the hot water heater A is used, the hot water storage tank 1 is always full.
In addition, a mixing valve 17 is provided for mixing water supplied through the branch water supply pipe 16 connected to the water supply pipe 11 and high-temperature water taken out from the upper part of the hot water storage tank 1 through the hot water supply pipe 15. Yes. Hot water mixed by the mixing valve 17 is supplied to a hot water supply terminal 19 via a hot water supply pipe 18.

  The configuration of the water heater A is not limited to that shown in FIG. For example, the water supply source may be configured to have a direct water pressure type structure in which water supplied from a water supply source is heated by heat exchange with high-temperature water taken out from the hot water storage tank 1.

The outer box 2 shown in FIG. 2 is a steel plate housing that houses the hot water storage tank 1, and the outer shape thereof has a vertically long rectangular parallelepiped shape. The outer box 2 includes a front plate 2a (first wall portion: see FIG. 1), a rear plate 2b (second wall portion), a pair of side plates 2c and 2d (third wall portion), a top plate 2e, And a bottom plate 2f. Each of the above-described plates is substantially integrated by pressing or welding.
In a state where the legs G of the hot water storage tank 1 are fixed, the hot water storage tank 1 is surrounded by a front plate 2a, a rear plate 2b, and a pair of side plates 2c, 2d in a cross-sectional view (see FIG. 3).

  On the front side of the outer box 2, a pipe cover K for housing the pipes and valves described above is installed. The piping cover K has a box shape (concave shape) with an opening on the side facing the outer box 2. By installing the piping cover K in the outer box 2, each piping and valves are shielded from the outside.

  Filling holes h1 and h2 (see FIG. 2) for filling the foam heat insulating material 4 are formed in the front plate 2a (see FIG. 1). Although details will be described later, in a state where the outer box 2 is laid sideways, a liquid foaming liquid heat insulating material 4 (foaming liquid) is injected through the filling holes h1 and h2 (see FIG. 4A). That is, the foam heat insulating material 4 is not a molded heat insulating material that has been molded in advance like foamed polystyrene, but is in a liquid state when filled.

The two filling holes h1 shown in FIG. 2 are provided above the hot water storage tank 1 fixed to the outer box 2, and the two filling holes h2 are provided below the hot water storage tank 1. That is, the liquid foam heat insulating material 4 injected through the filling holes h1 and h2 flows (injects) as it is onto the rear plate 2b without hitting the hot water storage tank 1 (FIG. 4A). reference).
Further, the front plate 2a has a plurality of air vent holes h3 (see FIG. 4A) for releasing the air filled in the gaps in the outer box 2 in the process of foaming (expanding) the foam heat insulating material 4. Is formed.

FIG. 3A is a transverse cross-sectional view of the hot water storage tank unit 20.
The foam heat insulating material 4 (dot-displayed portion shown in FIG. 3A) is for suppressing the heat leakage of hot water stored in the hot water storage tank 1, and between the hot water storage tank 1 and the outer box 2. Filled. That is, a gap is provided over the entire circumference between the hot water storage tank 1 and the inner wall surface of the outer box 2, and the foam heat insulating material 4 is filled in the gap.

As the foam heat insulating material 4, for example, a rigid polyurethane foam can be used. The rigid polyurethane foam is obtained by reacting two urethane foams of a polyol component and an isocyanate component in the presence of a foaming agent, a catalyst, and a foam stabilizer. In addition, cyclopentane, water, carbon dioxide gas, or the like can be used as a foaming agent.
In addition, the kind of foam heat insulating material 4 is not limited to a rigid polyurethane foam.

(Gap between hot water storage tank and outer box)
FIG. 3B is a partially enlarged view of the region M shown in FIG. As shown in FIG. 3B, a gap is provided between the hot water storage tank 1 and the rear plate 2b.
As described above, the foam heat insulating material 4 is filled in a state where the outer box 2 is laid sideways so that the front plate 2a provided with the filling holes h1 and h2 faces vertically upward (see FIG. 4A). . Accordingly, the distance L1 between the hot water storage tank 1 and the rear plate 2b (FIG. 3) so that the foamed heat insulating material 4 flowing down (injected) from the filling holes h1 and h2 toward the rear plate 2b spreads over the entire surface of the rear plate 2b. (B) is set.

  The above-mentioned “distance L1” means the distance between the hot water storage tank 1 and the rear plate 2b at the closest position. Further, “distance L2” (see FIG. 3C) described later means a distance between the hot water storage tank 1 and the side plate 2c (or side plate 2d) at the closest position.

As a result of experiments, the inventors found that when the distance L1 between the hot water storage tank 1 and the rear plate 2b is 4 mm or more, more preferably 5 mm or more, the liquid foam insulation 4 wets and spreads over the entire surface of the rear plate 2b. did.
In addition, when the distance L1 is less than 4 mm, as shown in FIG. 9 of the comparative example, the foam heat insulating material 4 is difficult to reach the intermediate portion Q (see FIG. 9A) of the rear plate 2b in the vertical direction. As a result, there is a high possibility that void B1 (space, so-called void) is generated in this intermediate portion Q (see FIGS. 9B and 9C).
Therefore, the distance L1 between the hot water storage tank 1 and the rear plate 2b is set to 4 mm or more, more preferably 5 mm or more. This makes it easier for the foam insulation 4 to spread over the entire gap in the outer box 2 by foaming after filling.

FIG. 3C is a partially enlarged view of the region N1 shown in FIG.
As shown in FIG.3 (c), the clearance gap is also provided between the hot water storage tank 1 and the left side plate 2c, and it is filled with the foam heat insulating material 4 (About the clearance gap between the hot water storage tank 1 and the right side plate 2d. The same applies to the region N2 in FIG.

  As a result of experiments by the inventors, when the distance L2 between the hot water storage tank 1 and the side plates 2c, 2d is equal to or greater than the distance L1 between the hot water storage tank 1 and the rear plate 2b, the foam heat insulating material is spread over the entire gap in the outer box 2. It was found that 4 could be filled. In addition, when the distance L2 is less than the distance L1, in the process in which the foamed heat insulating material 4 injected toward the rear plate 2b is foamed (see FIG. 9 (a)), the gap in the vertical direction with a sufficient space is provided. The foam heat insulating material 4 wraps around (see FIG. 9B), and the possibility of forming the void B2 increases (see FIG. 9C).

  Therefore, it is preferable that the distance L2 between the hot water storage tank 1 and the side plates 2c and 2d be equal to or longer than the distance L1 between the hot water storage tank 1 and the rear plate 2b. For example, when the distance L1 between the hot water storage tank 1 and the rear plate 2b is 5 mm and the distance L2 between the hot water storage tank 1 and the side plates 2c and 2d is 7 mm (≧ L1), foam insulation is provided over the entire gap in the outer box 2. The material 4 can be filled.

(Foaming insulation filling and foaming process)
Fig.4 (a) is explanatory drawing which shows a mode that the foaming heat insulating material 4 with which it filled was spread to the backplate 2b. In addition, illustration of each piping and valves was abbreviate | omitted in FIG. As shown in FIG. 4A, the outer box 2 that houses the hot water storage tank 1 is laid sideways so that the front plate 2a faces vertically upward.
Then, the periphery of the outer box 2 is covered with a foam management jig F indicated by a two-dot chain line. This foam management jig F resists the foaming (expansion) of the foam heat insulating material 4 so that the front plate 2a, the rear plate 2b, the side plates 2c and 2d, the top plate 2e, and the bottom plate 2f are all inside the outer box 2. It has a plate-shaped jig that presses it toward the surface. Further, the nozzle E is inserted into the filling holes h1 and h2, and the liquid foam heat insulating material 4 (foaming liquid) is injected through the nozzle E.

  When the foam heat insulating material 4 is injected, the foam heat insulating material 4 starts to accumulate from the front side and the rear side of the hot water storage tank 1, and spreads wet on the rear plate 2b. Here, as described above, the distance L1 (see FIG. 3B) between the hot water storage tank 1 and the rear plate 2b is 4 mm or more. Therefore, the foam heat insulating material 4 spreads over the entire surface of the rear plate 2b.

  FIG.4 (b) is explanatory drawing which shows a mode that the foam heat insulating material 4 foams. The foam heat insulating material 4 that has spread over the entire surface of the rear plate 2b is expanded by foaming. Here, the distance L2 between the hot water storage tank 1 and the side plates 2c, 2d is equal to or longer than the distance L1 between the hot water storage tank 1 and the rear plate 2b. Accordingly, not only the gap between the upper side and the lower side of the hot water storage tank 1 (in FIG. 4B, both the left and right sides of the paper surface), but also the gap between the hot water storage tank 1 and the side plates 2c and 2d (in FIG. The foam insulation 4 is also distributed to the front and back sides.

  FIG. 4C is an explanatory view showing a state where the foam heat insulating material 4 has spread over the entire gap in the outer box 2. When the foam heat insulating material 4 is expanded and expanded, the air that has been in the outer box 2 until then is pushed out through the air vent hole h3. And as shown in FIG.4 (c), the foam heat insulating material 4 spreads over the whole area of the clearance gap in the outer box 2. As shown in FIG. After foaming is completed, the foam insulation 4 is cured. Incidentally, the magnitude relationship (L2 ≧ L1) between the distance L1 and the distance L2 does not change before and after the filling of the foam heat insulating material 4.

<Effect>
According to this embodiment, the hot water storage tank unit 20 is designed so that the distance L1 between the hot water storage tank 1 and the rear plate 2b is 4 mm or more, more preferably 5 mm or more. Therefore, the foam heat insulating material 4 injected from the filling holes h1 and h2 can be spread over the entire surface of the rear plate 2b (see FIG. 4A).

  Further, the distance L2 between the hot water storage tank 1 and the side plates 2c, 2d is equal to or longer than the distance L1 between the hot water storage tank 1 and the rear plate 2b. Therefore, in the process in which the foam heat insulating material 4 is foamed, the foam heat insulating material 4 spreads over the gap between the hot water storage tank 1 and the side plates 2c and 2d (see FIG. 4B), and further, the entire gap in the outer box 2 The foam heat insulating material 4 spreads over (see FIG. 4C). That is, since the foamed heat insulating material 4 is filled around the hot water storage tank 1 without a gap, the heat insulating performance of the hot water storage tank unit 20 can be improved as compared with the conventional one.

<< Second Embodiment >>
The second embodiment is different from the first embodiment (see FIG. 3A) in that a vacuum heat insulating material 3 (see FIG. 5A) installed on the inner wall surface of the outer box 2 is added. Is the same as in the first embodiment. Therefore, a different part from 1st Embodiment is demonstrated and description is abbreviate | omitted about the overlapping part.

Fig.5 (a) is a cross-sectional view of the hot water storage tank unit 20A.
The vacuum heat insulating material 3 shown to Fig.5 (a) is for suppressing the heat leak of the hot water stored in the hot water storage tank 1, and is exhibiting the sheet form. The vacuum heat insulating material 3 includes, for example, a core material made of glass fiber (glass wool or the like) and an outer packaging material that wraps the core material. As the outer packaging material, a gas barrier resin film laminated with a thin film of aluminum can be used.

As shown in FIG. 5A, the vacuum heat insulating material 3 is provided on the inner wall surface of the outer box 2. That is, the vacuum heat insulating material 3 is provided on the inner surface of the front plate 2a, the inner surface (entire surface) of the rear plate 2b, and the inner surfaces (entire surface) of the side plates 2c and 2d. Note that the vacuum heat insulating material 3 is not stacked near the center of the front plate 2a in the left-right direction. This is to facilitate replacement of the temperature sensors Sa, Sb and the like (see FIG. 2).

  FIG. 5B is a partially enlarged view of the region M shown in FIG. In the vacuum heat insulating material 3, a distance L1 between a portion overlapping the rear plate 2b (second wall portion) and the hot water storage tank 1 is set to 4 mm or more, more preferably 5 mm or more. As described in the first embodiment, this is because the foam heat insulating material 4 (foaming liquid) injected through the filling holes h1 and h2 (see FIG. 4) is the entire surface of the vacuum heat insulating material 3 on the rear plate 2b. This is so that it spreads wet.

  FIG. 5C is a partially enlarged view of the region N1 shown in FIG. The distance L2 between the portion of the vacuum heat insulating material 3 that overlaps the side plates 2c and 2d (third wall portion) and the hot water storage tank 1 is the distance between the portion of the vacuum heat insulating material 3 that overlaps the rear plate 2b (second wall portion) and hot water storage. The distance from the tank 1 is equal to or greater than the distance L1 (see FIG. 5b). As described in the first embodiment, this is for the foamed heat insulating material 4 to spread throughout the entire gap in the outer box 2.

<Effect>
According to the present embodiment, the hot water storage tank unit is provided by providing the vacuum heat insulating material 3 with high heat insulating performance on the inner wall surface of the outer box 2 and filling the foam heat insulating material 4 between the hot water storage tank 1 and the vacuum heat insulating material 3. The heat insulation performance of 20A can be enhanced as compared with the first embodiment.
Further, since the inner wall surfaces of the front plate 2a, the rear plate 2b, and the side plates 2c, 2d of the outer box 2 are flat, the sheet-like vacuum heat insulating material 3 can be easily installed on the inner wall surface of the outer box 2.

Further, the vacuum heat insulating material 3 comes into close contact with the inner wall surface of the outer box 2 due to the foaming pressure of the foam heat insulating material 4. That is, since no gap is generated between the vacuum heat insulating material 3 and the outer box 2, the heat insulating performance of the hot water storage tank unit 20A can be enhanced.
Moreover, the above-mentioned distance L1 (refer FIG.5 (b)) shall be 4 mm or more, and also the distance L2 (refer FIG.5 (c)) shall be more than the distance L1, and the foam heat insulating material 4 is made around the hot water storage tank 1 around it. Can be filled without gaps. Therefore, the heat insulation performance of the hot water storage tank unit 20A can be enhanced.

«Third embodiment»
The third embodiment is different from the second embodiment (see FIG. 5A) in that the vacuum heat insulating material 3 (see FIG. 6A) is provided around the hot water storage tank 1, but the second embodiment is the second. This is the same as the embodiment. Therefore, a different part from 2nd Embodiment is demonstrated and description is abbreviate | omitted about the overlapping part.

Fig.6 (a) is a cross-sectional view of the hot water storage tank unit 20B.
The vacuum heat insulating material 3 shown in FIG. 6A has a sheet shape and is wound around the outer peripheral surface of the hot water storage tank 1.
Note that the circumferential length of the vacuum heat insulating material 3 is shorter than the entire circumference of the hot water storage tank 1. The vacuum heat insulating material 3 is wound around the hot water storage tank 1 so that the temperature sensors Sa and Sb (see FIG. 2) are exposed in a region where the vacuum heat insulating material 3 does not overlap the hot water storage tank 1 itself. As a result, when a malfunction occurs in the temperature sensors Sa and Sb, the temperature sensors Sa and Sb can be easily replaced.

  FIG. 6B is a partially enlarged view of the region M shown in FIG. The distance L1 between the rear plate 2b (second wall portion) and the vacuum heat insulating material 3 shown in FIG. 6B is 4 mm or more, more preferably 5 mm or more. This is because, as explained in the first embodiment, the foamed heat insulating material 4 (foamed liquid) injected through the filling holes h1 and h2 (see FIG. 4) spreads over the entire surface of the rear plate 2b. It is.

  FIG. 6C is a partially enlarged view of the region N1 shown in FIG. The distance L2 between the side plates 2c and 2d (third wall portion) and the vacuum heat insulating material 3 shown in FIG. 6C is the distance L1 between the rear plate 2b (second wall portion) and the vacuum heat insulating material 3 (FIG. 6 ( Refer to b) above. As described in the first embodiment, this is for the foamed heat insulating material 4 to spread throughout the entire gap in the outer box 2.

<Effect>
According to the present embodiment, the vacuum heat insulating material 3 having high heat insulating performance is provided on the outer peripheral surface of the hot water storage tank 1, and the foam heat insulating material 4 is filled between the outer box 2 and the vacuum heat insulating material 3, so that the heat insulating performance is improved. A high hot water storage tank unit 20B can be provided.
Further, the vacuum heat insulating material 3 can be brought into close contact with the outer peripheral surface of the hot water storage tank 1 by the foaming pressure of the foam heat insulating material 4. Further, the foam heat insulating material 4 can be filled in the gap between the upper end plate 1 b (see FIG. 2) and the lower end plate 1 c (see FIG. 2) that cannot be covered with the vacuum heat insulating material 3 and the outer box 2. Therefore, the heat in the hot water storage tank 1 can be prevented from leaking to the outside of the outer box 2, and the heat insulation performance of the hot water storage tank unit 20B can be enhanced.

<< Fourth Embodiment >>
The fourth embodiment is different from the first embodiment in that the outer box 2C (see FIG. 7) is a regular octagonal shape in a cross-sectional view, but is otherwise the same as the first embodiment. Therefore, a different part from 1st Embodiment is demonstrated and description is abbreviate | omitted about the overlapping part.

FIG. 7 is a cross-sectional view of the hot water storage tank unit 20C.
The outer box 2 </ b> C includes a “first wall portion” having a filling hole (not shown) for filling the foam heat insulating material 4. The “first wall portion” includes a front plate 2a, a front inclined plate 2g that connects the front plate 2a and the side plate 2c, and a front inclined plate 2h that connects the front plate 2a and the side plate 2d. Yes. The above-mentioned filling hole is provided in the front inclined plates 2g and 2h, for example.

The outer box 2 </ b> C includes a “second wall portion” that faces the aforementioned “first wall portion”. The “second wall” includes a rear plate 2b, a rear inclined plate 2i that connects the rear plate 2b and the side plate 2c, and a rear inclined plate 2j that connects the rear plate 2b and the side plate 2d. Yes.
Further, the outer box 2C includes a pair of side plates 2c and 2d (third wall portions) surrounding the hot water storage tank 1 together with the aforementioned "first wall portion" and "second wall portion".
Each of the above-described plates is substantially integrated by pressing, welding, or the like, and the outer box 2C has a regular octagonal shape in a cross-sectional view.

Further, a gap is provided between the hot water storage tank 1 and the outer box 2 over the entire circumference in the circumferential direction, and the foam heat insulating material 4 is filled in the gap. Similarly to the first embodiment, the distance between the hot water storage tank 1 and the rear plate 2b (second wall portion) is set to 4 mm or more, more preferably 5 mm or more (see region M in FIG. 7).
Further, the distance between the hot water storage tank 1 and the side plates 2c, 2d (third wall portion) is not less than the distance between the hot water storage tank 1 and the rear plate 2b (second wall portion) (regions N1, N2 in FIG. 7). See).

<Effect>
According to the present embodiment, the outer box 2C has a regular octagonal cross section, which is closer to a circle than the cross section (square shape) of the outer box 2 in the first embodiment. Therefore, the distance between the hot water storage tank 1 and the inner wall surface of the outer box 2C can be made uniform in the circumferential direction. Thereby, the filling amount of the foam heat insulating material 4 in the circumferential direction is made uniform, and the foaming pressure acting on the hot water storage tank 1 is also made uniform. Therefore, deformation of the hot water storage tank 1 due to foaming pressure can be suppressed.

  Further, by providing the front inclined plates 2g and 2h, the substantially triangular spaces R1 and R1 can be used as the installation space for the pipe. Therefore, the length of the hot water storage tank unit 20C including the piping cover K in the front-rear direction can be made shorter than that in the first embodiment, and the size can be reduced.

«Fifth embodiment»
5th Embodiment differs in the shape of the cross section of outer case 2D (refer FIG. 8) compared with 4th Embodiment. Moreover, the point from which the vacuum heat insulating materials 3b, 3c, and 3d (refer FIG. 8) are provided in the inner wall face of the outer case 2D differs from 4th Embodiment. Others are the same as in the fourth embodiment. Therefore, a different part from 4th Embodiment is demonstrated and description is abbreviate | omitted about the overlapping part.

FIG. 8 is a cross-sectional view of the hot water storage tank unit 20D.
The outer box 2D includes a “first wall portion” having a filling hole (not shown) for filling the foam heat insulating material 4. The “first wall” includes a front plate 2a, front inclined plates 2g and 2h, and connection plates 2m and 2n. The front inclined plate 2g is connected to the left end of the front plate 2a, and the connection plate 2m is connected to the left end of the front inclined plate 2g and extends parallel to the front plate 2a (the same applies to the front inclined plate 2h and the connection plate 2n). . The above-mentioned filling hole is provided in the front inclined plates 2g and 2h, for example.

Further, the outer box 2D includes a “second wall portion” that faces the above-described “first wall portion”. The “second wall portion” includes a rear plate 2b, rear inclined plates 2i and 2j, and connection plates 2p and 2q. The rear inclined plate 2i is connected to the left end of the rear plate 2b, and the connecting plate 2p is connected to the left end of the rear inclined plate 2i and extends parallel to the rear plate 2b (the same applies to the rear inclined plate 2j and the connecting plate 2q). .
Further, the outer box 2D includes a pair of side plates 2c and 2d (third wall portions) surrounding the hot water storage tank 1 together with the above-described "first wall portion" and "second wall portion".

  As shown in FIG. 8, a vacuum heat insulating material 3b is installed on the inner wall surfaces of the rear plate 2b and the rear inclined plates 2i and 2j. A vacuum heat insulating material 3c is installed on the inner wall surface of the left side plate 2c, and a vacuum heat insulating material 3d is installed on the inner wall surface of the right side plate 2d. In this way, the vacuum heat insulating materials 3b, 3c, 3d are installed on a part of the inner wall surface of the outer box 2C, and the connection place between the side plate 2c and the connection plate 2p, the connection place between the side plate 2d and the connection plate 2q, etc. Has a configuration without vacuum insulation. Therefore, it is not necessary to bend the vacuum heat insulating material cured by vacuuming or the like, and the manufacturing process of the hot water storage tank unit 20D can be simplified.

  Further, gaps (vacuum heat insulating materials 3b, 3c, 3d) are provided around the entire circumference in the circumferential direction between the vacuum heat insulating materials 3b, 3c, 3d provided on the inner wall surface of the outer box 2D and the hot water storage tank 1. In a place where the two do not overlap, a gap between the hot water storage tank 1 and the outer box 2C is provided, and the foamed heat insulating material 4 is filled in this gap.

Similarly to the second embodiment, the distance between the portion of the vacuum heat insulating material 3 that overlaps the rear plate 2b (second wall portion) and the hot water storage tank 1 is 4 mm or more, more preferably 5 mm or more (region of FIG. 8). See M).
Further, the distance between the hot water storage tank 1 and the location overlapping the side plates 2c and 2d (third wall portion) in the vacuum heat insulating material 3 is the same as the distance between the hot water storage tank 1 and the location overlapping the rear plate 2b (second wall portion) in the vacuum heat insulating material 3. (See regions N1 and N2 in FIG. 8).

<Effect>
According to the present embodiment, by providing the connection plates 2m and 2n parallel to the front plate 2a, holes (not shown) provided in the connection plates 2m and 2n and piping connected to the hot water storage tank 1 (see FIG. (Not shown) can be simplified.
When the outer box 2D is assembled, a plate-like member in which the front plate 2a, the front inclined plates 2g and 2h, and the connection plates 2m and 2n are integrated is assembled to the hot water storage tank 1 from the front. At this time, if all of the pipes connected to the hot water storage tank 1 extend in parallel in the front-rear direction, the positioning of the holes provided in the plate-like member and the respective pipes (positioning in the vertical and horizontal directions) is performed. It can be done easily.

  Incidentally, when a hole is provided in the front inclined plates 2g and 2h that are not perpendicular to the front-rear direction, and the pipe extending in the front-rear direction is passed through the hole, the above-described hole is made elliptical and further corresponds to the shape of the hole. It becomes necessary to prepare an oval seal member (not shown).

On the other hand, according to the present embodiment, the pipes extending in the front-rear direction from the left and right sides of the hot water storage tank 1 are passed through the circular holes provided in the connection plates 2m, 2n perpendicular to the front-rear direction. Can do. Therefore, the assembling work of the hot water storage tank unit 20D can be simplified, and the degree of freedom in arranging the piping can be increased.
In addition, it goes without saying that the hot water storage tank unit 20D has high heat insulation performance as in the above-described embodiments.

≪Modification≫
As mentioned above, although hot water storage tank unit 20 grade | etc., Which concerns on this invention was demonstrated by each embodiment, this invention is not limited to these description, A various change can be made.
For example, in each embodiment, the configuration in which the filling holes h1 and h2 (see FIG. 2) of the foam heat insulating material 4 are provided on both the upper and lower sides of the hot water storage tank 1 has been described. It may be provided, or a filling hole may be provided only in one of the vicinity of the upper end or the lower end of the front plate 2a.

  Moreover, in 1st Embodiment, it may replace with the filling hole of the front board 2a, and you may make it provide a filling hole in the back board 2b (1st wall part). In this case, by setting the distance L1 between the front plate 2a (second wall portion) facing the rear plate 2b and the hot water storage tank 1 to 4 mm or more, the foam insulation 4 can be spread over the entire surface of the front plate 2a. . Furthermore, by making the distance L2 between the side plates 2c, 2d (third wall portion) and the hot water storage tank 1 equal to or greater than the above-described distance L1, it is possible to fill the entire area of the gap in the outer box 2 with the foam heat insulating material 4.

  Moreover, although 2nd Embodiment demonstrated the structure which provides the vacuum heat insulating material 3 in the inner wall surface of the front board 2a, the rear board 2b, and the side boards 2c and 2d, in addition to these each board, the top board 2e and the bottom board The vacuum heat insulating material 3 may be provided also on the inner wall surface of 2f.

  Moreover, each embodiment can be combined suitably. For example, the third embodiment and the fourth embodiment may be combined, the outer box 2C (see FIG. 7) may have a regular octagonal shape in a cross-sectional view, and the vacuum heat insulating material 3 may be provided on the inner wall surface of the outer box 2C. . Further, the first embodiment and the fifth embodiment may be combined to form the outer box 2D (see FIG. 8) as described in the fifth embodiment, and the vacuum heat insulating material 3 may not be provided.

  Each embodiment is described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

A Water heater 10 Heat pump unit 20, 20A, 20B, 20C, 20D Hot water storage tank unit 1 Hot water storage tank 2, 2B, 2C, 2D Outer box 2a Front plate (first wall)
2b Rear plate (second wall)
2c, 2d side plate (third wall)
2g, 2h Front inclined plate (first wall)
2i, 2j Rear inclined plate (second wall)
2m, 2n connecting plate (first wall)
2p, 2q connection plate (second wall)
3, 3b, 3c, 3d Vacuum heat insulating material 4 Foam heat insulating material h1, h2 Filling hole

In order to solve the above problems, a hot water storage tank unit according to an embodiment of the present invention includes a hot water storage tank having a cylindrical side wall, an outer box that houses the hot water storage tank, and the hot water storage tank and the outer box. A hard polyurethane foam foam heat insulating material filled in between, and the outer box has a first wall portion having a filling hole for filling the foam heat insulating material, and a flat plate facing the first wall portion A pair of flat plate-like third wall portions surrounding the side wall of the hot water storage tank together with the first wall portion and the second wall portion, and the third wall portion and the The distance from the side wall of the hot water storage tank is 7 mm or more .

Claims (6)

A hot water storage tank,
An outer box containing the hot water storage tank;
A foam heat insulating material filled between the hot water storage tank and the outer box,
The outer box is
A first wall having a filling hole for filling the foam insulation;
A second wall facing the first wall;
A pair of third wall portions surrounding the hot water storage tank together with the first wall portion and the second wall portion,
The hot water storage tank unit, wherein a distance between the third wall portion and the hot water storage tank is not less than a distance between the second wall portion and the hot water storage tank. The hot water storage tank unit according to claim 1, wherein a distance between the second wall portion and the hot water storage tank is 4 mm or more. A hot water storage tank,
An outer box containing the hot water storage tank;
A vacuum heat insulating material provided on the inner wall surface of the outer box;
A foam heat insulating material filled between the hot water storage tank and the vacuum heat insulating material,
The outer box is
A first wall having a filling hole for filling the foam insulation;
A second wall facing the first wall;
A pair of third wall portions surrounding the hot water storage tank together with the first wall portion and the second wall portion,
In the vacuum heat insulating material, a distance between the portion that overlaps the third wall portion and the hot water storage tank is equal to or greater than a distance between a portion that overlaps the second wall portion and the hot water storage tank in the vacuum heat insulating material. Hot water storage tank unit. The hot water storage tank unit according to claim 3, wherein a distance between a portion of the vacuum heat insulating material overlapping the second wall portion and the hot water storage tank is 4 mm or more. A hot water storage tank,
An outer box containing the hot water storage tank;
A vacuum heat insulating material provided around the hot water storage tank;
A foam heat insulating material filled between the outer box and the vacuum heat insulating material,
The outer box is
A first wall having a filling hole for filling the foam insulation;
A second wall facing the first wall;
A pair of third wall portions surrounding the hot water storage tank together with the first wall portion and the second wall portion,
The hot water storage tank unit, wherein a distance between the third wall portion and the vacuum heat insulating material is not less than a distance between the second wall portion and the vacuum heat insulating material. The hot water storage tank unit according to claim 5, wherein a distance between the second wall portion and the vacuum heat insulating material is 4 mm or more.

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