JP6979341B2 - Hot water storage tank unit and equipment equipped with it - Google Patents

Description

The present invention relates to a hot water storage tank unit and a device including the same.

As a hot water storage tank unit provided with a hot water storage tank for storing hot water, Patent Document 1 discloses a structure in which a regular octagonal outer box 2C surrounds a circular hot water storage tank 1 in a cross-sectional view (a structure in which a regular octagonal outer box 2C surrounds a circular hot water storage tank 1). 0054, FIG. 7). Further, Patent Document 2 discloses a structure in which the space between the hot water storage tank 2 and the outer box 3 is formed into a substantially octagonal shape by arranging a spacer p (0013,0039, FIG. 3).

Both Patent Documents 1 and 2 attempt to suppress deformation of the hot water storage tank 1 by equalizing the filling amount of the foamed heat insulating material in the circumferential direction and equalizing the foaming pressure acting on the hot water storage tank (paragraph 0054 of Patent Document 1). , Paragraph 0039 of Patent Document 2).

Japanese Unexamined Patent Publication No. 2016-44961 Japanese Unexamined Patent Publication No. 2016-44920

The injected liquid foam insulation material generates heat and expands as the chemical reaction progresses. Along with this progress, unexpected voids (voids in which the foamed heat insulating material does not exist) were generated.

The present invention made in view of the above circumstances is provided on a cylindrical body plate extending in the axial direction, an upper end plate provided on one side of the body plate in the axial direction, and an upper end plate provided on one side of the body plate in the axial direction. A hot water storage tank with a lower end plate and
An outer box having two filling holes provided on one surface of the hot water storage tank, and an outer box.
A hot water storage tank unit comprising a heat insulating material filled in a space formed between the outer surface of the hot water storage tank and the inner surface of the outer box.
The outer box has a front plate located in the front, a rear plate located in the rear, a pair of side plates located in each of the left-right directions, a top plate located above, and a bottom plate located below.
The filling holes are located above the upper end plate of the front plate and below the lower end plate.
Two flow restraints located between the outer surface of the hot water storage tank and the front plate so as to extend in the axial direction of the hot water storage tank without a break and located axially inside the axial end of the hot water storage tank. There is a part,
Each of the flow suppressing unit, wherein with respect to a virtual plane passing through the axial view center of the hot water storage tank, located on the opposite side of some or all the left and right directions of the flow suppressing portion, and the hot water storage tank It is characterized in that it is formed over a part or all of the radial separation dimension from the outer wall of the outer box to the inner wall of the outer box.

Overall configuration diagram of a water heater provided with a hot water storage tank unit according to the first embodiment of the present invention. Side view of the outer box of the hot water storage tank unit of the first embodiment An exploded perspective view of the hot water storage tank unit of the first embodiment Bottom sectional view of the hot water storage tank unit of the first embodiment It is explanatory drawing which shows the filling and foaming process of the foaming heat insulating material of 1st Embodiment, and is the state immediately after the injection start of the foaming heat insulating material. It is explanatory drawing which shows the filling and foaming process of the foaming heat insulating material of 1st Embodiment, and the state that the injected foaming heat insulating material gets wet and spreads. It is explanatory drawing which shows the filling | foaming process of the foaming heat insulating material of 1st Embodiment, and the state that the foaming heat insulating material foams and expands. It is explanatory drawing which shows the filling and foaming process of the foaming heat insulating material of 1st Embodiment, and the state that the foaming heat insulating material has reached near the 1st wall part. It is explanatory drawing which shows the filling and foaming process of the foaming heat insulating material of 1st Embodiment, and the appearance that the foaming heat insulating material spread over the whole area of the gap in the outer box. A perspective view depicting the outer surface of the hot water storage tank and the inner surface of the outer box of the second embodiment. Bottom sectional view of the outer surface of the hot water storage tank and the inner surface of the outer box of the second embodiment. Conceptual diagram showing a method for designing the shape of the inner surface of the outer box of the second embodiment. Bottom sectional view when the cylindrical outer box 2 is adopted Bottom sectional view of the hot water storage tank and the outer box of the third embodiment

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Similar components are given similar reference numerals, and similar explanations are not repeated. The various components of the present invention do not necessarily have to be independent of each other, and one component is composed of a plurality of members, a plurality of components are composed of one member, and one of the components. Allows the part and some of the other components to overlap each other, etc.

<< First Embodiment >>
<Water heater A>
FIG. 1 is an overall configuration diagram of the water heater A according to the first embodiment. The water heater A heats the hot water stored in the hot water storage tank 1 by 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 the water to the hot water supply terminal 19. The device includes a heat pump unit 10 and a hot water storage tank unit 20. The configuration of the water heater A is not limited to that shown in FIG. For example, a direct water pressure type configuration may be used in which the water supplied from the water supply source is heated by heat exchange with the high temperature water taken out from the hot water storage tank 1.

(Heat pump unit 10)
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 to make high-temperature water, and returns the high-temperature water to the top of the hot water storage tank 1 via the hot water outlet pipe 14, and is compressed. A machine, a condenser, a pressure reducing valve, and an evaporator are provided, and these are sequentially connected in an annular shape via a pipe. The heat medium is circulated by the heat pump cycle via the pipe, and the low temperature water flowing from the hot water storage tank 1 via the water inlet pipe 12 is heated by the condenser.

(Hot water storage tank unit 20)
FIG. 2 is a side view of the outer box 2 of the hot water storage tank unit 20, FIG. 3 is an exploded perspective view of the hot water storage tank unit 20, and FIG. 4 is a bottom sectional view of the hot water storage tank unit 20 of the present embodiment. The direction of the bottom cross section of the hot water storage tank unit 20 can coincide with the direction of the cross section perpendicular to the filling holes h1 and h2 described later.
The hot water storage tank unit 20 can store hot water, and the hot water storage tank 1, the outer box 2 accommodating the hot water storage tank 1, and the foamed heat insulating material 4 (foamed and filled between the hot water storage tank 1 and the outer box 2) ( (Parts displayed in dots in FIG. 1) and.

<Hot water storage tank 1>
The hot water storage tank 1 has a hollow bottomed cylinder shape and can store hot water. The hot water storage tank 1 is provided on a tubular (cylindrical in this embodiment) body plate 1a extending in the axial direction, an upper end plate 1b provided on one side of the body plate 1a in the axial direction, and on the other side in the axial direction. It is provided with a lower end plate 1c. The upper end plate 1b and the lower end plate 1c are welded to the body plate 1a. For the hot water storage tank 1, for example, a stainless steel plate can be used. The outer surface of the body plate 1a may be referred to as the outer surface of the hot water storage tank 1.

When the hot water storage tank unit 20 is installed, the hot water storage tank 1 is installed in a direction in which the axial direction substantially coincides with the gravitational direction. In this embodiment, the name of each member is defined based on the orientation at this time. In addition, in the installation direction of the hot water storage tank unit 20 in the filling process of the liquid foam heat insulating material 4 described later, the axial direction of the hot water storage tank 1 substantially coincides with the horizontal direction.

Temperature sensors Sa and Sb are sequentially installed on the outer peripheral surface of the hot water storage tank 1 from the upper end plate 1b toward the lower end plate 1c at predetermined intervals. At the lower part of the hot water storage tank 1, three legs G fixed and extending to the lower side surface of the hot water storage tank 1 are installed, and each leg G is fixed to the outer box 2 by a bolt.

At the bottom of the hot water storage tank 1, there is a water pipe 11 for supplying water from the water supply source to the hot water storage tank 1, and a container for introducing the water (low temperature water) stored in the lower part of the hot water storage tank 1 into the heat pump unit 10. Is connected to the water pipe 12. By driving the pump 13 installed in the water inlet pipe 12, the low temperature water stored in the lower part of the hot water storage tank 1 is pressure-fed to the heat pump unit 10 via the water inlet pipe 12.

Further, in 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 in the upper part of the hot water storage tank 1 And are connected. When the water heater A is used, the hot water storage tank 1 is always full, for example.

In addition, a mixing valve 17 for mixing water supplied through the branched 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 via the hot water supply pipe 15 is installed. There is. The hot water mixed by the mixing valve 17 is supplied to the hot water supply terminal 19 via the hot water supply pipe 18.

<Outer box 2>
The outer box 2 is a steel plate housing for accommodating the hot water storage tank 1, and its outer shape is long in the axial direction of the hot water storage tank 1. In the outer box 2, the filling holes h1 and h2 are formed, and the front plate 2a (first wall portion) located in front of the hot water storage tank 1 and the rear plate 2b (second wall portion) located in the rear. It has a pair of side plates 2c and 2d (third wall portion) located in the left-right direction, a top plate 2e located above, and a bottom plate 2f located below. The filling holes h1 and h2 are located diagonally opposite to each other in the front plate 2a, for example. Further, the filling holes h1 and h2 may be located, for example, above the upper end plate 1b and below the lower end plate 1c, respectively, or may be located in a region between the upper end plate 1b and the lower end plate 1c, respectively. More specifically, when the liquid foam heat insulating material 4 is injected, the filling holes h1 and h2 fall without contacting the piping or the hot water storage tank 1 arranged in the outer box 2. Therefore, it is preferable that the rear plate 2b is arranged at a position where it reaches the inner surface.

The outer box 2 can be formed so that the cross-sectional shape perpendicular to the axial direction is substantially constant at an arbitrary position in the axial direction. Further, the cross-sectional shape of the outer box 2 perpendicular to the axial direction can be a concave polygon. In the present embodiment, the shapes of the top plate 2e and the bottom plate 2f and the cross-sectional shape perpendicular to the axial direction of the outer box 2 substantially match.

The front plate 2a and the rear plate 2b are connected to the outer ends in the left-right direction of the straight plate portions 2ac and 2bc and the straight plate portions 2ac and 2bc as flat portions, which are located on the central side in the left-right direction in the bottom cross-sectional view, respectively. Connected to the left-right outer ends of the inclined portions 2al, 2ar, 2bl, 2br, and the inclined portions 2al, 2ar, 2bl, 2br, which are portions that incline from the outside in the front-rear direction toward the inside in the left-right direction. It has an outer extending portion 2all, 2arr, 2bll, 2brr as a flat portion extending in a direction substantially parallel to the straight plate portions 2ac and 2bc and connecting to the side plates 2c and 2d. The internal angle formed by the inclined portion and the outward extending portion can be, for example, 180 ° or more.

When the filling holes h1 and h2 are placed so that the outer surface of the front plate 2a faces upstream or directly upstream in the gravity direction, a virtual half line extending directly downstream in the gravity direction is drawn from each of the filling holes h1 and h2. In addition, this virtual half line is provided at a position where it reaches the rear plate 2b through the space between the body plate 1a and the side walls 2c and 2d. As a result, when the liquid (pre-foaming) foamed heat insulating material 4 is injected from each of the filling holes h1 and h2, the foamed heat insulating material 4 includes the hot water storage tank 1, the side plates 2c and 2d, the legs G, and the piping (not shown). ) Is expected to reach the rear plate 2b directly without contacting. In this embodiment, the filling holes h1 and h2 are provided in the outer extending portions 2all and 2ar, respectively. The body plate 1a is located on the inner side in the horizontal direction from the above-mentioned half straight line extending in the substantially vertical direction from the filling holes h1 and h2. Further, for example, the straight plate portion 2bc and the outer extending portions 2bll and 2brr of the rear plate 2b may be provided with air holes (not shown) for bleeding air as the foamed heat insulating material 4 foams.

<Flow suppression units 51, 52>
(Knowledge of the inventors)
The expansion rate of the liquid foamed heat insulating material 4 injected between the outer box 2 and the hot water storage tank 1 increases as the temperature rises due to the progress of the chemical reaction. Then, when the expansion is stopped due to the end of the chemical reaction or the like, the stress applied to the surroundings by the foamed heat insulating material 4 in the minute volume fluctuates. Here, if the density and expansion rate of the foamed heat insulating material 4 existing on a certain side near the minute volume and on the opposite side (including the foamed heat insulating material in a solidified state after the reaction is stopped) are different, the minute amount is present. The inventors have found that the stress applied to the foamed heat insulating material 4 in the volume becomes unbalanced and can be broken to form a void.

Therefore, firstly, a configuration is desired in which the density and expansion rate of the foamed heat insulating material 4 are made uniform in each region (because the latter half of the reaction is relatively high speed, uniformization is particularly required). For example, there is a configuration in which the dimensional change in the region where the foamed heat insulating material 4 expands is suppressed, or a member capable of suppressing the expansion is provided in the region where the dimensional change is large.

Second, if the space in which the foamed heat insulating material 4 can expand is made into a substantially octagonal shape as in Patent Documents 1 and 2, the liquid foamed heat insulating material 4 tends to concentrate in one region inside in the left-right direction in the above figure. Therefore, there is a possibility that problems such as ubiquitous density of the foamed heat insulating material 4 after the completion of expansion may occur. Therefore, the region on the rear plate 2b side (downstream side of gravity) on which the liquid foamed heat insulating material 4 is dropped is made as flat as possible, and the liquid foamed heat insulating material 4 spreads substantially uniformly before starting foaming. It is desired that the foamed heat insulating material 4 be configured so that the density is substantially uniform.

However, Patent Documents 1 and 2 do not disclose a structure in consideration of such circumstances, and at least in the case of forming a substantially regular octagonal space as described above, a liquid foam heat insulating material is used outside the hot water storage tank. The specific position of the filling hole to be injected between the box and the box is not disclosed (for example, paragraph 0051 of Patent Document 1). Therefore, no technical idea is disclosed in view of the preferable distribution of the liquid foamed heat insulating material at the start of foaming.

(Arrangement of flow restraint, etc.)
In the axial cross-sectional view of the hot water storage tank unit 20 illustrated in FIG. 4, the hot water storage tank 1 is surrounded by an outer box 2, more specifically, a front plate 2a, a rear plate 2b, and a pair of side plates 2c, 2d. ..

Regarding the radial direction in the axial cross-sectional view (diametrical direction of the hot water storage tank 1), the axial direction of the hot water storage tank 1 (observation direction in the bottom cross-sectional view, that is, the filling hole) between the inner surface of the outer box 2 and the body plate 1a. Planal flow suppressing portions 51 and 52 extending continuously without a break or substantially without a break (in the normal direction of the plane perpendicular to h1 and h2) are provided. Regarding the radial direction of the hot water storage tank 1, the flow suppression portions 51 and 52 are provided over a part or all of the horizontal or radial separation dimension from the outer wall of the hot water storage tank 1 to the inner wall of the outer box 2. The flow restraining portions 51 and 52 are convex-shaped members that are attached to the inner surface of the outer box 20 and / or the body plate 1a and extend in the axial direction. The flow suppression portions 51 and 52 do not reach the region overlapping the upper end plate 1b and the lower end plate 1c in the radial view, that is, they are not provided on the axial end side of the body plate 1a and are in the axial center. It is provided only on the side.

The flow suppression units 51 and 52 each have a part or all (preferably all) of a certain virtual plane P (virtual line in the visual field in the axial direction) passing through the axial center of the hot water storage tank 1. Are located on opposite sides of each other. That is, although it is preferable that the flow suppressing portions 51 and 52 extend in the linear axis direction, it is not prevented that the flow suppressing portions 51 and 52 deviate from the linear axis direction and extend to the circumferential direction side as well.

Further, the flow suppressing portions 51 and 52 may be provided between the front plate 2a and the rear plate 2b, but are preferably provided on the side closer to the front plate 2a. As a result, it is possible to suppress the flow of the foamed heat insulating material 4 described later when the temperature rises.

Regarding the axial direction of the hot water storage tank 1, the flow suppression portions 51 and 52 are arranged so as to be inside the axial end portion of the hot water storage tank 1, preferably one end or both ends within the range of the body plate 1a.

The flow suppressing portions 51 and 52 suppress the flow or expansion of the foamed heat insulating material 4 beyond the flow suppressing portions 51 and 52 mainly in the circumferential direction in the expansion process of the foamed heat insulating material 4 described later.

<Leg G>
When the relatively lower side of the hot water storage tank unit 20 is viewed in cross section, not only the flow suppressing portions 51 and 52 but also the legs G can be observed. Three legs G are installed at intervals of 120 ° in this embodiment when viewed from the bottom of the hot water storage tank 1. The two legs G each form a gap with the outer box 2, and one leg G does not form a gap with the outer box 2 or forms a narrow gap compared to the two legs G. is doing.

<Effervescent insulation 4>
FIG. 5 is an explanatory diagram showing the injection (filling) / foaming process of the foamed heat insulating material 4 of the present embodiment, in which (A) the state immediately after the injection of the foamed heat insulating material 4 is started, and (B) the injected foamed heat insulating material 4 is Wet spread, foaming started, (C) foamed heat insulating material 4 foamed and expanded, (D) foamed heat insulating material 4 reached near the front plate 2a, (E) outer box 2 It shows how the foamed heat insulating material 4 spreads over the entire area of the inner gap.

As the foam insulation material 4, for example, a rigid polyurethane foam can be used. The rigid polyurethane foam is obtained by reacting two urethane foaming liquids, a polyol component and an isocyanate component, in the presence of a foaming agent, a catalyst and a foaming agent. Further, as the foaming agent, cyclopentane, water, carbon dioxide gas or the like can be used.

First, before injecting the liquid foam insulation material 4, the hot water storage tank unit 20 is placed so that the straight plate portion 3bc of the rear plate 2b comes into contact with the floor surface. As a result, the direction from the front plate 2a to the rear plate 2b substantially coincides with the direction of gravity, and the outer surfaces of the filling holes h1 and h2 face the upstream side or the immediately upstream side in the gravity direction.

Next, the foamed heat insulating material 4 is injected through the filling holes h1 and h2 (FIG. 5A). The positions of the filling holes h1 and h2 are preferably the outer extension portions 2all and 2arr as illustrated in FIG. 5A. However, as illustrated in FIGS. 5B to 5E, it may be provided on the straight plate portion 2ac, or may be provided on the inclined portions 2al and 2ar. As in the present embodiment, the rear plate 2b has a straight plate portion 2bc as a flat portion located on the gravity direction side and an outer extending portion 2bll, 2brr as a flat portion located on the semi-gravity direction side of the straight plate portion 2bc. If it is provided, it is preferable that the filling holes h1 and h2 are provided at the positions where the foamed heat insulating material 4 falls in the outer extending portions 2bll and 2brr.

The injected liquid foamed heat insulating material 4 is dropped onto, for example, the rear plate 2b, and a chemical reaction proceeds to generate heat and expand (FIG. 5B). When a predetermined amount of the foamed heat insulating material 4 is injected, the injection is stopped (FIG. 5C). In the present embodiment in which the filling holes h1 and h2 are provided at the positions where the foamed heat insulating material is dropped on the outer extending portions 2bll and 2brr, the liquid foamed heat insulating material 4 has two flat portions until the injection is stopped. Spread to. As described above, the pipes and the like connected to the hot water storage tank 1 are arranged so that the foamed heat insulating material 4 dropped from the filling holes h1 and h2 does not come into contact with the rear plate 2b before reaching the rear plate 2b. The liquid level of the foamed heat insulating material 4 that has started to expand rises in the space between the hot water storage tank 1 and the outer box 2.

When the temperature of the foamed heat insulating material 4 rises with the heat generation, the expansion rate also rises. That is, while the expansion is relatively on the rear plate 2b side, it is the first half of the chemical reaction and the expansion speed is relatively low because the temperature is relatively low. As it approaches the front plate 2a side, the temperature becomes high and the expansion speed increases. In particular, when the expansion rate is high, the liquid level of the foamed heat insulating material 4 reaches a region formed between the inner surface of the outer plate 2 and the outer surface of the hot water storage tank 1 where the variation in the spatial shape is large, that is, the foamed heat insulating material 4 When the foamed heat insulating material 4 expands and reaches a region where the area of the liquid surface of the liquid surface fluctuates greatly, the expansion speed (fluid flow speed) changes with the fluctuation. At this time, the foamed heat insulating material 4 has a different magnitude of stress received from the foamed heat insulating material 4 in the vicinity. For example, when the expansion rate of the foamed heat insulating material 4 on the liquid surface increases due to the fluctuation of the area of the liquid surface, the expansion rate of the foamed heat insulating material 4 near the liquid surface is smaller than this, so that the foamed heat insulating material on the liquid surface increases. 4 will be subjected to tensile stress. Therefore, the foamed heat insulating material 4 that has reached such a region has a relatively high risk of breaking and forming voids.

Here, the variation of the space of the present embodiment will be examined. First, the area of the liquid surface in the axial cross-sectional view of the hot water storage tank 1 as illustrated in FIG. 4 varies depending on the shape of the space between the outer surface of the hot water storage tank 1 and the inner surface of the outer box 2, but as in the present embodiment. When the shape of the hot water storage tank 1 or the outer box 2 is designed so that the cross-sectional shape is substantially constant with respect to the axial direction, the fluctuation in the area of the foamed heat insulating material 4 expanding in the axial direction is small, while the fluctuation is small. As the space expands, the area of the foamed heat insulating material 4 that rises (progresses in the substantially circumferential direction of the hot water storage tank 1) becomes large. In particular, when the cylindrical hot water storage tank 1 and the concave polygonal outer box 2 as in the present embodiment are adopted, the circumference of the inclined portion or the outer extending portion, which is a region where the internal angle is relatively significantly different from that of the other portions. There is a large fluctuation in. Further, as described above, the expansion rate of the foamed heat insulating material 4 is large in the latter half of the reaction.

Therefore, in the present embodiment, in the region where the inner angle of the outer box 2 is large, the flow suppressing portions 51 and 52 extending in the axial direction around the inclined portion and the outer extending portion on the front plate 2a side on the upstream side of gravity. Is arranged.

Then, the foamed heat insulating material 4 is suppressed from expanding in the ascending direction (circumferential direction) by coming into contact with the flow suppressing portions 51 and 52 in the region where the fluctuation of the liquid surface area is likely to be large, and the flow suppressing portion 51, It expands along the extending direction of 52 (between FIGS. 5C and 5D; it can flow as shown by the arrow illustrated in FIG. 5C). The foamed heat insulating material 4 that has reached the outer ends of the flow suppressing portions 51 and 52 wraps around the flow suppressing portions 51 and 52 and further expands along the extending direction of the flow suppressing portions 51 and 52 (FIG. 5D). .. As described above, since the fluctuation of the area of the liquid surface along the axial direction is relatively small, the expansion speeds of the liquid surface of the foamed heat insulating material 4 and the vicinity of the liquid level are substantially equal, so that the foamed heat insulating material 4 receives from the vicinity. The stress is roughly balanced and the formation of voids is suppressed.

The wraparound foam heat insulating material 4 foams over substantially the entire space between the hot water storage tank 1 and the outer box 2 (FIG. 5E). Since the foaming process proceeds in this way, at least a part of the air holes provided in the front plate 2a is a region where the foamed heat insulating material 4 is filled in the final stage of the foaming process. It is preferable that they are arranged at positions facing the space between them.

<< Second Embodiment >>
The configuration of this embodiment can be configured in the same manner as that of the first embodiment except for the following points. FIG. 6 is a perspective view showing the outer surface of the hot water storage tank 1 and the inner surface of the outer box 2 of the present embodiment, FIG. 7 is a bottom sectional view of the outer surface of the hot water storage tank 1 and the inner surface of the outer box 2 of the present embodiment, and FIG. 8 is the present embodiment. A conceptual diagram showing a method for designing the shape of the inner surface of the outer box 2 of the form, FIG. 9 is a bottom sectional view when the outer box 2 provided with the cylindrical body plate 1a is adopted.

The outer surface of the hot water storage tank 1 of the present embodiment is circular in an axial cross-sectional view. The axial cross section of the inner surface of the outer box 2 is substantially concentric with the center of the circle forming the body plate 1a of the hot water storage tank 1 (the center of the hot water storage tank 1), and is a virtual circle larger than the diameter of the hot water storage tank 1. It roughly matches the closed loop shape formed by connecting tangent lines. In the present embodiment, as illustrated in FIG. 7, the axial cross section of the inner surface of the outer box 2 is configured to be a substantially regular octagon, but a plurality of straight lines exemplified in FIG. 8 (as tangent lines to the above-mentioned virtual circle). It can be formed by a closed loop formed by connecting the obtained straight lines). In this case, the horizontal or radial dimensions of the space formed between the body plate 1a of the hot water storage tank 1 and the inner surface of the outer box 2 in the axial cross-sectional view are preferably substantially uniform, and the generation of voids is generated. In order to suppress it, it is preferable that the difference between the maximum dimension portion and the minimum dimension portion is 0, 1, 2, or 3 mm or less.

As in the present embodiment, the intersections of the tangents may be connected as they are, but it is preferable that the vicinity of the intersections are convex in the direction away from the hot water storage tank 1 and smoothly connected. In this way, it is easy to make the dimensions of the space uniform.

The number of tangents to be used is preferably 8 or 9 or more, and as illustrated in FIG. 9, a circle corresponding to an infinite number is most preferable.

It should be noted that the horizontal or radial dimensions of the space do not necessarily have to be substantially uniform over the entire area in the bottom cross-sectional view, and at least among the dimensions from the front plate 2a (filling holes h1 and h2 sides) to the rear plate 2b, the front plate 2a It suffices if the dimensions in the region from the side to 3, 4, or 50% are substantially uniform. This also applies to the above-mentioned first embodiment.

<< Third Embodiment >>
The configuration of this embodiment can be configured in the same manner as that of the first or second embodiment except for the following points. FIG. 10 is a bottom sectional view of the hot water storage tank 1 and the outer box 2 of the present embodiment. The outer extending portions 2bl and 2br of the present embodiment are provided separately from the wall surface of the outer box 2 and are flat portions extending in the horizontal direction, and are located in the filling holes h1 and h2, for example, in the vertical downward direction. There is.

A Water heater 10 Heat pump unit 20 Hot water storage tank unit 1 Hot water storage tank 1a Body plate 1b Upper end plate 1c Lower end plate 2 Outer box 2a Front plate (first wall)
2ac, 2bc straight plate part (flat part)
2al, 2ar, 2bl, 2br Inclined part 2all, 2ar, 2bll, 2br External extension part (flat part)
2b Rear plate (second wall)
2c, 2d side plate (third wall part)
2e Top plate 2f Bottom plate 4 Foam insulation h1, h2 Filling holes

Claims (1)

A hot water storage tank having a cylindrical body plate extending in the axial direction, an upper end plate provided on one side of the body plate in the axial direction, and a lower end plate provided on the other side in the axial direction of the body plate.
An outer box having two filling holes provided on one surface of the hot water storage tank, and an outer box.
A hot water storage tank unit comprising a heat insulating material filled in a space formed between the outer surface of the hot water storage tank and the inner surface of the outer box.
The outer box has a front plate located in the front, a rear plate located in the rear, a pair of side plates located in each of the left-right directions, a top plate located above, and a bottom plate located below.
The filling holes are located above the upper end plate of the front plate and below the lower end plate.
Two flow restraints located between the outer surface of the hot water storage tank and the front plate so as to extend in the axial direction of the hot water storage tank without a break and located axially inside the axial end of the hot water storage tank. There is a part,
Each of the flow suppressing unit, wherein with respect to a virtual plane passing through the axial view center of the hot water storage tank, located on the opposite side of some or all the left and right directions of the flow suppressing portion, and the hot water storage tank A hot water storage tank unit characterized in that it is formed over a part or all of the radial separation dimension from the outer wall of the outer box to the inner wall of the outer box.

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