JP6524301B2 - Hot water storage tank unit - Google Patents

Description

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

  A conventional hot water storage tank unit has been proposed that covers the circumference of the hot water storage tank with a plurality of molded heat insulating materials (formed foamed heat insulating materials) and covers the circumference of the molded heat insulating material with an outer case (see Patent Document 1) .

Unexamined-Japanese-Patent No. 2011-106791

  However, Patent Document 1 does not describe a method for preventing positional deviation due to floating of the hot water storage tank due to foaming pressure when using a liquid foam heat insulating material.

  The present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a hot water storage tank unit capable of preventing displacement due to lifting of a hot water storage tank.

The present invention comprises a hot water storage tank having a cylindrical side wall, an outer case for containing the hot water storage tank, and a foam insulation of hard polyurethane foam filled between the hot water storage tank and the outer case, said outer box, wherein a first wall portion having a filling hole for filling the foam insulation, and a second wall portion you face the first wall portion, said first wall portion and the second wall portion And a pair of third wall portions surrounding the side wall of the hot water storage tank, an upper plate located at the upper side, and a lower plate located at the lower side, and an inner leg provided to the hot water storage tank and fixed to the lower plate. A supporting member is provided at an upper portion of the hot water storage tank, between the first wall portion and the hot water storage tank.

  According to the present invention, it is possible to provide a hot water storage tank unit capable of preventing displacement due to lifting of the hot water storage tank.

It is a whole block diagram which shows the water heater provided with the hot water storage tank unit which concerns on 1st Embodiment. It is a perspective view which shows the inside of the hot water storage tank unit which concerns on 1st Embodiment. It is the top view which looked at the hot water storage tank unit which concerns on 1st Embodiment from the inlet side. It is sectional drawing when the hot water storage tank unit which concerns on 1st Embodiment is seen from the upper plate side of a hot water storage tank. (A) shows the flow of the foamed heat insulating material (stock solution) at the time of injection, (b) shows the state of the foamed heat insulating material (stock solution) after completion of the injection, (c) shows the foamed heat insulating material during foaming It is a figure which shows the state of. It is a cross-sectional view of the hot water storage tank unit which concerns on 1st Embodiment. (A) shows the coated state of the vacuum heat insulating material before injection of the foamed heat insulating material, and (b) shows the injected state of the foamed heat insulating material and the coated state of the vacuum heat insulating material after foaming. (A) is a sectional view when the hot water storage tank unit according to the second embodiment is viewed from the upper plate side of the hot water storage tank, (b) is a view showing the flow at the time of injection of the foam insulation (undiluted solution), (c ) Is a figure which shows the state in the middle of foaming of a foaming heat insulating material. (A) is a cross-sectional view when the hot water storage tank unit according to the third embodiment is viewed from the upper plate side of the hot water storage tank, (b) is a view showing a flow at the time of injection of the foam heat insulating material (stock solution) (c ) Is a figure which shows the state in the middle of foaming of a foaming heat insulating material. (A) is a cross-sectional view when the hot water storage tank unit according to the fourth embodiment is viewed from the upper plate side of the hot water storage tank, (b) is a view showing the flow at the time of injection of the foam insulation (undiluted solution), (c ) Is a figure which shows the state in the middle of foaming of a foaming heat insulating material.

  Hereinafter, hot water storage tank units 1A to 1D according to an embodiment of the present invention will be described with reference to FIGS.

First Embodiment
First, a water heater K provided with a hot water storage tank unit 1A according to the present embodiment will be described with reference to FIG. FIG. 1: is a whole block diagram which shows the water heater provided with the hot water storage tank unit which concerns on 1st Embodiment.
As shown in FIG. 1, the water heater K includes a hot water storage tank unit 1 </ b> A and a heat pump unit 10.

  The hot water storage tank unit 1A includes a hot water storage tank 2, an outer case 3A, an inner leg (leg portion) 4, a vacuum heat insulating material 5, and a foam heat insulating material 6.

  The lower portion of the hot water storage tank 2 is connected to a water supply pipe 11 (pipe) into which tap water is introduced. The water in the lower part of the hot water storage tank 2 is introduced into the heat pump unit 10 by the pump (not shown) via the water inlet pipe 12 (piping). The hot water heated by the heat pump unit 10 is introduced to the upper portion of the hot water storage tank 2 via the hot water discharge pipe 13.

  For example, the temperature of the hot water in the hot water storage tank 2 becomes higher as it goes upward from the lower side in the vertical direction. That is, from the lower part to the upper part in the hot water storage tank 2, relatively low temperature, medium temperature, and high temperature temperature distribution are obtained. For example, the temperature is about 90 ° C. at the top of the hot water storage tank 2 and about 50 ° C. at the middle.

  The heat pump unit 10 is for boiling water taken out of the hot water storage tank 2 and, for example, a compressor that compresses a refrigerant (for example, carbon dioxide) to a high temperature / high pressure, a refrigerant discharged from the compressor, and a hot water storage A condenser that heats the water from the hot water storage tank 2 by heat exchange with the water from the tank 2, a pressure reducing valve that reduces the pressure of the refrigerant from the condenser, and a refrigerant that has been reduced by absorbing heat in the atmosphere And an evaporator. In the present embodiment, the heat pump unit 10 is described as an example of the heating means. However, the heating means may be an electric heater or a gas.

  After the hot water taken out from the upper part of the hot water storage tank 2 passes through the hot water supply pipe 14 and is mixed with the water from the branched water supply pipe (not shown) branched and connected to the water supply pipe 11 via the mixing valve 16 The hot water is discharged from the hot water supply terminal 18 through the hot water supply pipe 17. In the present embodiment, although the case where the hot water in the hot water storage tank 2 is used for the hot water supply terminal 18 is described as an example, the water supplied without using the hot water of the hot water storage tank 2 as hot water in the hot water supply terminal The present invention may be applied to a hot water storage tank unit (direct pressure hot water supply type) of a type used as a heat medium for heat exchange (heating).

  The outer case 3A has a space for accommodating the hot water storage tank 2, and a piping cover 3s is attached to the front (front side). The piping cover 3s has a space for accommodating the hot water discharge pipe 13, the branch water supply pipe (not shown), the mixing valve 16, the hot water supply pipe 17 and the like going from the heat pump unit 10 to the hot water storage tank 2.

FIG. 2 is a perspective view showing the inside of the hot water storage tank unit 1A according to the first embodiment. In addition, FIG. 2 has shown the state which notched the front plate 3a side of 3 A of outer cases, and illustration of various piping is abbreviate | omitted.
As shown in FIG. 2, the hot water storage tank 2 is, for example, a substantially bowl-shaped (hemispherical, bowl-like) upper mirror plate 2b covering the upper opening of the cylindrical shell 2a and the shell 2a with a material such as stainless steel. It is configured by welding three members of a substantially bowl-like (hemispherical, vessel-like) lower end plate 2c covering the lower opening of the body plate 2a.

  Further, the hot water storage tank 2 is supported by the bottom plate 3e of the outer case 3A via the three inner legs 4 (4A), 4 (4B) and 4 (4C). The lower end of each inner leg 4 is fixed to the bottom plate 3e of the outer case 3A by a method such as bolting. The number of inner legs 4 is not limited to three, and may be four or more.

  Further, temperature sensors T1, T2 (thermistor) are provided on the outer surface (front surface) of the hot water storage tank 2 at intervals in the vertical direction. The upper temperature sensor T1 detects the boiling temperature which is the temperature of the upper portion of the hot water storage tank 2. The lower temperature sensor T2 detects the temperature of middle warm water in the middle of the hot water storage tank 2. The number of temperature sensors T1 and T2 is not limited to this embodiment, and three or more temperature sensors are provided from the upper portion to the lower portion of the hot water storage tank 2 as well as the upper portion of the hot water storage tank 2 It may be.

  The outer case 3A is made of a steel plate that accommodates the hot water storage tank 2, and is positioned forward of the hot water storage tank 2 with a front plate 3a (see FIG. 1), side plates 3b and 3b, and aft. A rear plate (back plate) 3c (see also FIG. 1), an upper plate (top plate) 3d located at the upper side, and a bottom plate 3e located at the lower side (bottom side) constitute a vertically long square box.

  The piping cover 3s is provided in front of the outer case 3A, and has a shape that covers the whole of the front plate 3a (see FIG. 1) of the outer case 3A from the upper end to the lower end. Further, the height and the width (left and right direction) of the piping cover 3s are configured the same as the height and the width of the outer case 3A. Thus, in a state where the pipe cover 3s is attached to the outer case 3A, it has a vertically-long rectangular parallelepiped shape in an appearance view.

  In addition, an inlet 8 for injecting the undiluted solution 6a (see FIG. 1 and FIG. 5 (a) to (c) below) into the lower part of the front plate 3a of the outer case 3A. , 8 are formed through the front plate 3a so as to communicate with the inside of the outer case 3A. In the upper part of the front plate 3a of the outer case 3A, the inlets 9, 9 for injecting the undiluted solution 6a of the foamed heat insulating material 6 are formed penetrating the front plate 3a so as to communicate with the inside of the outer case 3A. It is done. The injection ports 8, 8, 9, and 9 are holes necessary for injecting the undiluted solution 6a of the foamed heat insulating material 6, and are closed with a lid after pouring and foaming of the undiluted solution 6a of the foamed heat insulating material 6. It is

  The foamed heat insulating material 6 is not a pre-formed heat insulating material (formed heat insulating material) such as expanded polystyrene, but the undiluted solution 6 a of the foamed heat insulating material is injected into the foamed heat insulation space between the hot water storage tank 2 and the outer box 3A. It is comprised by making it foam later. For example, a rigid polyurethane foam is used as the foam insulation 6. This rigid polyurethane foam is obtained by reacting two urethane stock solutions of a polyol component and an isocyanate component in the presence of a foaming agent, a catalyst and a foam stabilizer. Examples of the blowing agent include cyclopentane, water, carbon dioxide gas and the like. In addition, the foam heat insulating material 6 is not limited to a rigid polyurethane foam.

  The inner leg 4 is formed so as to be bent in an L shape in cross section (a so-called L-shaped angle) and extends along the axial direction of the hot water storage tank 2 from the upper side of the lower end plate 2c toward the bottom plate 3e. It is arranged. Further, the inner leg 4 has a leg receiving portion 4 a, and the leg receiving portion 4 a is fixed to the outer surface of the hot water storage tank 2 by welding. The leg receiving portion 4a is also bent in an L-shape in cross section, and is configured such that the upper portion of the inner leg 4 is inserted. The inner leg 4 is fixed to the leg receiving portion 4a via a plurality of bolts BT.

  Also, each inner leg 4 is arranged at intervals of 120 degrees around the hot water storage tank 2, and one inner leg 4 (4A) is arranged at the front end (the most forwardly located portion) of the hot water storage tank 2, The other inner legs 4 (4 B, 4 C) are arranged to face the left and right diagonally rear of the hot water storage tank 2.

  Outer legs 7 are fixed to the lower surface of the bottom plate 3 e at positions corresponding to the respective inner legs 4. The outer leg 7 is fixed to the installation point G via an anchor bolt (not shown) or the like.

  The vacuum heat insulating material 5 is in the form of a sheet, and is wound around the body plate 2 a of the hot water storage tank 2. Further, the vacuum heat insulating material 5 is configured by covering the core material made of glass fiber such as glass wool, an outer wrapping material that wraps the core material, etc., and evacuating the inside of the outer wrapping material. The outer packaging material is made of, for example, a laminated film made of aluminum having gas barrier properties.

  Moreover, the length of the axial direction and the circumferential direction of the vacuum heat insulating material 5 is formed shorter than the axial direction length of the hot water storage tank 2 and the length of the entire circumference, and the non-overlapping portions 5 b and 5 a do not overlap the hot water storage tank 2. The hot water storage tank 2 is wound so that the leg receiving portion 4a and the temperature sensors T1 and T2 are located. The reason for this is to ensure that the leg receiving portion 4a and the hot water storage tank 2 are fixed. Moreover, it is for making replacement | exchange of temperature sensor T1, T2 easy when temperature sensor T1, T2 has a malfunction.

3 is a plan view of the hot water storage tank unit viewed from the inlet side, and FIG. 4 is a cross-sectional view of the hot water storage tank unit according to the first embodiment viewed from the upper plate side of the hot water storage tank Cross reference). 3 and 4 show the state before the undiluted solution 6a of the foamed heat insulating material 6 is injected.
As shown in FIG. 3, in the lower part of the hot water storage tank 2, when looking at the back plate 3c of the outer box 3A through the inlets 8 and 8, the inner leg 4 (4A) is located at the center in the width direction. The other inner legs 4, 4 (4B, 4C) are located at substantially both ends in the width direction. Further, the water supply pipe 11 and the water supply pipe 12 pass from the center side of the hot water storage tank 2 toward the outer peripheral side (the front side in the vertical direction in the figure) through the vicinity of the bottom plate 3e and upward along the inner leg 4 (4A) It is arranged.

  Further, gaps s1 and s1 are formed between the side plate 3b of the outer box 3A and the hot water storage tank 2. The foamed heat insulating material 6 is also filled in the gaps s1 and s1. By the way, when the hot water storage tank 2 is in direct contact with the side plate 3b, the heat in the hot water storage tank 2 may escape to the outside of the hot water storage tank unit 1A through the outer case 3A. However, by securing the gap s1 between the side plate 3b of the outer case 3A and the hot water storage tank 2, heat leakage can be suppressed, so that the efficiency of the water heater 1 can be suppressed from being reduced. It is possible to configure the hot water storage tank unit 1A in a compact size by setting the gap s1 to the minimum distance that can suppress the heat leakage.

  On the other hand (in the left in the figure), the inlet 8A (8) is formed at a position out of all of the hot water storage tank 2, the inner leg 4B, the inlet pipe 12 and the inner leg 4A, and after the outer box 3A via the inlet 8A. It is formed in the position which can see through board 3c (back). In other words, the inlet 8A is formed so as not to overlap with the hot water storage tank 2, the inner leg 4B, the water inlet pipe 12, and the inner leg 4A in a plan view when viewed from the inlet 8A.

  Similarly, the inlet 8B (8) on the other side (right side in the figure) is formed at a position out of all of the hot water storage tank 2, the inner leg 4C, the water supply pipe 11 and the inner leg 4A, and the outer case is provided via the inlet 8B. It is formed in the position which can see through back plate 3c (back) of 3A. In other words, in plan view when viewed from the inlet 8B, the inlet 8B is formed at a position not overlapping the inner leg 4C, the hot water storage tank 2, the water supply pipe 11, and the inner leg 4A.

  In the upper part of the hot water storage tank 2, when looking at the inside of the outer box 3A from the side of the inlet 9 of the undiluted solution 6a of the foam insulation 6, the outlet pipe 13 and the hot water supply pipe 14 It extends toward the front side (the piping cover 3s side) along the upper mirror plate 2b toward the side (see also FIG. 4 later). Further, when the water heater K includes a bath (not shown), the heat exchanger HE for additional heating is installed in the hot water storage tank 2, and the bathtub return pipe 15 connected to the heat exchanger HE is the hot water storage tank 2 Connected to the top of the. The bathtub return pipe 15 also extends from the center side of the hot water storage tank 2 toward the front side (the piping cover 3s side), similarly to the hot water discharge pipe 13 and the hot water supply pipe 14.

  The inlets 9, 9 (9A, 9B) are formed at positions away from the hot water storage tank 2, the hot water outlet pipe 13, the hot water supply pipe 14 and the bathtub return pipe 15, and the rear panel 3c of the outer box 3A is inserted through the inlets 9A, 9B. It is formed in the position which can see through. In other words, the inlets 9A and 9B are formed so as not to overlap the hot water storage tank 2, the hot water outlet pipe 13, the hot water supply pipe 14 and the bathtub return pipe 15 in plan view when viewed from the inlets 9 and 9BA.

The hot water supply pipe 14 at the upper part of the hot water storage tank 2 is disposed near the substantially top of the upper end plate 2 b via a socket 20. In addition, the socket 20 of the hot water discharge pipe 13 and the bathtub return pipe 15 is abbreviate | omitted in FIG. The socket 20 includes, for example, a hollow cylindrical portion for inserting the hot water supply pipe 14 and a flange portion having a shape that protrudes from the hollow cylindrical portion in a projecting manner.
The support member 40 is engaged with the socket 20 at a step portion between the flange portion and the hollow cylindrical portion. The support member 40 is, for example, a clamp having a substantially hollow cylindrical shape with a bottom, and having a hollow diameter at the bottom substantially equal to the outer diameter of the hollow cylindrical portion of the socket 20. And the notch 21 for penetrating the hot-water supply pipe 14 is provided. The support member 40 is fixed to the outer case 3A by a method such as welding or bolting with the clamp upper plate 3d. In other words, the support member 40 is a clamp which engages with the socket 20 for fixing the hot water supply pipe 14 to the hot water storage tank 2, and this clamp is a side of the inner leg 4 which is one end side of the hot water storage tank 2 in the outer box 3A. It is fixed to the inside of the field which counters the other end side which is the opposite side.

  In this state, as shown in FIG. 4, the inlets 9A and 9B are directed vertically upward, and the undiluted solution 6a of the foamed heat insulating material 6 is injected downward from the inlets 9A and 9B. That is, the inlets 9A and 9B are on the upper side in the vertical direction, and the rear plate 3c of the outer case 3 is on the bottom side.

  By the way, when the undiluted solution 6a of the foam heat insulating material 6 before foaming is injected from the injection ports 9A, 9B, the hot water discharge pipe 13, the hot water supply pipe on the way the undiluted solution 6a of the foam heat insulating material 6 reaches the back plate 3c of the outer case 3A. 14. Foaming starts in other members such as the outlet pipe 13, the hot water supply pipe 14, the bathtub return pipe 15, the socket 20, and the support member 40 when the other members such as the bathtub return pipe 15, the socket 20 and the support member 40 contact. As a result, the foam insulation 6 may not be spread behind the other members. Therefore, in the present embodiment, when the undiluted solution 6a of the foamed heat insulating material 6 before foaming is injected downward from the injection ports 9A and 9B in the vertical direction, the undiluted solution 6a of the foamed heat insulating material 6 is the hot water storage tank 2 and the outlet tube 13 The inner wall surface 3c1 of the rear plate 3c of the outer case 3A is reached without contacting the hot water supply pipe 14, the bathtub return pipe 15, the socket 20, and the support member 40. Thereby, the foamed heat insulating material 6 can be foamed upward from the bottom side, and the foamed heat insulating material 6 can be spread over the entire gap between the hot water storage tank 2 and the outer case 3A.

  When the undiluted solution 6a of the foamed heat insulating material 6 is injected from the injection ports 8A, 8B, the undiluted solution 6a of the foamed heat insulating material 6 injected from the injection ports 8A, 8B is the hot water storage tank 2, the inner legs 4A, 4B, 4C. The inner wall surface 3c1 of the rear plate 3c of the outer box 3A is reached without contacting the water supply pipe 11 and the water supply pipe 12. Thereby, the foamed heat insulating material 6 can be foamed upward from the bottom side, and the foamed heat insulating material 6 can be spread over the entire gap between the hot water storage tank 2 and the outer case 3A.

  Further, a clearance s2 is formed between the rear plate 3c of the outer case 3A and the hot water storage tank 2. The foamed heat insulating material 6 is also filled in the gap s2. A gap s3 is also formed between the front plate 3a of the outer case 3A and the hot water storage tank 2. As described above, the leakage of heat can be suppressed by securing the gaps s2 and s3, so that the efficiency of the water heater 1 can be suppressed from decreasing. By setting the gaps s2 and s3 to a minimum distance that can suppress the heat leakage, the hot water storage tank unit 1A can be configured compactly.

Fig.5 (a) is a figure which shows the flow of the foaming heat insulating material (undiluted | stock solution) at the time of injection | pouring, FIG.5 (b) is a figure which shows the state of the foaming heat insulating material (undiluted | stock solution) after completion of injection, FIG.5 (c) It is a figure which shows the state in the middle of foaming. Note that the description of the hot water discharge pipe 13 and the bathtub return pipe 15 is omitted.
As shown in FIG. 5A, before the piping cover 3s (see FIG. 1) is attached, the hot water storage tank 2 is fixed in the outer case 3A by the inner legs 4A, 4B, 4C and the support member 40. The outer case 3A is turned over, the upper and lower sides of the outer case 3A in use are horizontal, and the front plate 3a is upward, so that the inlets 8 and 9 face upward. As described above, in a state where the outer case 3A is turned over, the foam management jig is used around the outer case 3A so that the outer case 3A is not deformed by the pressing force when the undiluted solution 6a of the foam heat insulating material 6 foams. , Also referred to as 30) (see the two-dot chain line in FIG. 5). The foam management jig 30 is provided with a plate-like jig which surrounds the entire periphery of the outer case 3A and presses all of the front plate 3a, the side plates 3b and 3b, the rear plate 3c, the upper plate 3d and the bottom plate 3e. Then, the nozzle 31 formed in advance at a position corresponding to the inlets 8 and 9 is inserted into the inlets 8 and 9 from the outside of the foam management jig 30, and the undiluted solution 6 a of the foamed heat insulating material 6 from the inlets 8 and 9. Inject.

  As a result, the undiluted solution 6a of the foamed heat insulating material 6 injected from the injection ports 9A and 8B is not disturbed by the hot water storage tank 2, the hot water discharge pipe 13, the hot water supply pipe 14, the bathtub return pipe 15, the socket 20, and the support member 40. , And the inner wall surface 3c1 of the bottom side (rear plate 3c). Then, the undiluted solution 6a of the foamed heat insulating material 6 spreads along the inner wall surface 3c1 of the back plate 3c, and spreads on one surface of the inner wall surface 3c1 at a predetermined depth as shown in FIG. 5 (b). In addition, the depth which injects the undiluted | stock solution 6a of the foaming heat insulating material 6 can be suitably changed according to the foaming ratio of the foaming heat insulating material 6. As shown in FIG.

Thereafter, the foamed heat insulating material 6 starts foaming, and as shown in FIG. 5C, from the rear plate 3c side (lower side in the figure, bottom side) of the outer case 3A to the front plate 3a side (upper side in the diagram) Gradually foam. Then, the foamed heat insulating material 6 foams to the inner wall surface 3a1 of the front plate 3a, and the entire gap between the outer case 3A and the hot water storage tank 2 is filled with the foamed heat insulating material 6.
At this time, the lower side of the hot water storage tank 2 (the left side in the drawing of FIG. 5A) is the foaming pressure Pa of the foam insulation 6 by the inner legs 4A, 4B, 4C fixed to the outer case 3A (FIG. Even if it receives the white arrow in FIG. 5C), positional deviation such as floating is prevented. Further, the upper side of the hot water storage tank 2 (the right side of the drawing of FIG. 5A) is also subjected to the foaming pressure Pa of the foam heat insulating material 6 by the support member 40 fixed to the outer case 3A (FIGS. Even if receiving the white arrow of), positional deviation such as floating is prevented.
Further, since the entire outer surface of the outer case 3A is held down by the foam management jig 30, it is possible to prevent the outer case 3A from expanding (deforming) by the foaming pressure Pa when the foam heat insulating material 6 foams. it can. And the foaming heat insulating material 6 hardens | cures after foaming is completed.

FIG. 6 is a cross-sectional view of the hot water storage tank unit.
As shown by dots in FIG. 6, the foam heat insulating material 6 is provided between the vacuum heat insulating material 5 wound around the hot water storage tank 2 and the outer case 3A.

  Further, at the front of the hot water storage tank unit 1A, a gap s3 is formed between the outer case 3A and the hot water storage tank 2 closest to the outer case 3A, and the foam heat insulating material 6 is filled in the gap s3. . Moreover, the foam heat insulating material 6 is filled also in the non-overlapping part 5a in which the vacuum heat insulating material 5 of the hot water storage tank 2 is not wound.

  Further, on both sides of the hot water storage tank unit 1A, gaps s1 and s1 are formed between the outer case 3A and the vacuum heat insulating material 5 closest to the outer case 3A, and the foam heat insulating material 6 is filled in each gap s1. It is supposed to be Similarly, in the rear portion of the hot water storage tank unit 1A, a gap s2 is formed between the outer case 3A and the vacuum heat insulating material 5 closest to the outer case 3A, and the foam heat insulating material 6 is filled in the gap s2. There is.

  Thus, the gap s3 is formed between the hot water storage tank 2 and the outer case 3A, and the gaps s1, s1, s2 are formed between the vacuum heat insulating material 5 and the outer case 3A, and the foam heat insulating material 6 is installed here. Thus, the heat in the hot water storage tank 2 can be prevented from leaking through the vacuum heat insulating material 5 to the outside of the outer case 3A.

FIG. 7 (a) shows the coated state of the vacuum heat insulating material before the injection of the foamed heat insulating material, and FIG. 7 (b) shows the injected state of the foamed heat insulating material and the coated state of the vacuum heat insulating material after the foaming.
By the way, although the vacuum heat insulating material 5 is excellent in the heat insulating performance compared with the foam heat insulating material 6 etc., it is compressed and hardened by vacuum suction etc. There are difficulties in arranging such a cured product to be arbitrarily bent or closely fixed to the cylindrical shape of the outer surface of the hot water storage tank 2.

  Therefore, in the present embodiment, by using the vacuum heat insulating material 5 and the foam heat insulating material 6 in combination, the vacuum heat insulating material 5 is in close contact with the outer peripheral surface of the hot water storage tank 2 by using the pressure at the time of foaming of the foam heat insulating material 6 It can be done. Further, in the present embodiment, the gaps s1, s2, and s3, the upper mirror plate 2b, which can not be filled with the vacuum heat insulating material 5, by using the foam heat insulating material 6 which is foamed after injection instead of the molded foam heat insulating material. A gap around the lower end plate 2 c can be filled with the foam heat insulating material 6. Thereby, the heat insulation performance can be improved.

  That is, as shown in FIG. 7A, if the vacuum heat insulating material 5 is wound around the outer surface of the hot water storage tank 2 before being filled with the foamed heat insulating material 6, the space between the outer surface of the hot water storage tank 2 and the vacuum heat insulating material 5 A gap S is formed. However, as shown in FIG. 7 (b), by injecting the foam insulation 6 between the outer case 3 A and the vacuum insulation 5, the foaming pressure Pa when the foam insulation 6 foams is a vacuum insulation The vacuum heat insulating material 5 comes in close contact with the outer surface of the hot water storage tank 2 by acting in a direction to press the hot water storage tank 5 against the hot water storage tank 2.

  Thus, since the vacuum heat insulating material 5 can be stuck to the hot water storage tank 2, it becomes possible to improve the heat insulation performance in the hot water storage tank unit 1A. Thereby, it is possible to obtain the hot water storage tank unit 1A having high energy saving performance.

(Action / effect)
The operation and effect of the first embodiment are summarized as follows.
In the hot water storage tank unit 1A of the first embodiment, when the inlets 9A and 9B look at the inside of the outer box 3A from the inlets 9 (9A and 9B), the hot water storage tank 2 and the piping (the hot water outlet pipe 13 and the hot water supply pipe 14, the bathtub return pipe 15), the socket 20, and the support member 40 are disposed at positions where the back of the outer box 3A (the rear plate 3c) can be seen without being disturbed. According to this, when the undiluted solution 6a of the foamed heat insulating material 6 is injected from the injection ports 9A, 9B, the undiluted solution 6a of the foamed heat insulating material 6 is directly supplied from the injection ports 9A, 9B to the inner wall surface 3c1 of the back plate 3c. Therefore, the foam insulating material 6 can be filled in the entire gap between the outer case 3 A and the hot water storage tank 2 above the hot water storage tank 2. Thus, the hot water storage tank unit 1A having high thermal insulation performance can be obtained.

  In addition, in the hot water storage tank unit 1A of the first embodiment, when the inlets 8A and 8B are viewed from the inside of the outer box 3A from the inlets 8 (8A and 8B), the hot water storage tank 2 and piping (water supply pipe 11 It is arrange | positioned in the position which can see through the back (back plate 3c) of outer case 3A, without being disturbed by water supply pipe 12) and inner leg 4 (4A, 4B, 4C). According to this, when the undiluted solution 6a of the foamed heat insulating material 6 is injected from the injection ports 8A, 8B, the undiluted solution 6a of the foamed heat insulating material 6 is directly supplied from the injection ports 8A, 8B to the inner wall surface 3c1 of the back plate 3c. Therefore, the foam insulation 6 can be filled in the entire space between the outer case 3A and the hot water storage tank 2 below the hot water storage tank 2. Thus, the hot water storage tank unit 1A having high thermal insulation performance can be obtained.

  Generally, when the stock solution 2a of the foamed heat insulating material 6 is injected into the inside of the outer case 3A, the hot water storage tank 2 is likely to be displaced due to the buoyancy due to the foaming pressure Pa since the inside is empty. However, in the hot water storage tank 2 of the present embodiment, while the inner legs 4A, 4B and 4C are fixed to the outer case 3A via the leg receiving portion 4a on the lower side (the left side in the drawing of FIG. 5A also has a structure in which the support member 40 is fixed to the outer case 3A via the socket 20. FIG. As a result, the movement of the hot water storage tank 2 is restricted even when receiving the bubbling pressure Pa of the foamed heat insulating material 6 (see the white arrows in FIG. 5B and FIG. 5C). And the like can be reliably prevented.

  Further, according to the present embodiment, since the sheet-like vacuum heat insulating material 5 is wound around the hot water storage tank 2, the heat insulating property can be further enhanced, and the vacuum heat insulation is performed by the foaming pressure Pa of the foam heat insulating material 6. Since the material 5 can be brought into close contact with the outer peripheral surface of the hot water storage tank 2, the hot water storage tank unit 1A having higher thermal insulation performance can be obtained.

  Further, according to the present embodiment, since the inner legs 4 (4A, 4B, 4C) are constituted by three, the hot water storage tank 2 can be stably and easily supported in the outer box 3A, and , And the inlets 8 and 8 are formed at positions where the back plate 3c can be seen without being disturbed by the hot water storage tank 2, the pipes (the water supply pipe 11 and the water inlet pipe 12) and the inner legs 4 (4A, 4B, 4C) be able to.

  By the way, the hot water storage tank unit 1A is generally installed at a place exposed to external air (rain) such as outdoor for home use. Moreover, since the foam heat insulating material 6 has a property weak to water, it is desirable that it is a structure which does not contact with water. Therefore, in the present embodiment, the injection ports 8 and 8 are disposed on the pipe cover 3s side (the front plate 3a side) to complete the injection and foaming of the undiluted solution 6a of the foam heat insulating material 6, and then the injection ports 8 and 8 Is covered by the piping cover 3s (see FIG. 1). Therefore, the inlets 8 and 8 to be the water (rainwater) penetration inlets will be covered with the piping cover 3s, and the inlets 8 and 8 will be filled with water (for example, the inlets 8 and 8 may be covered) Even if measures are not taken to fill the gap of the lid with the seal member, the entry of water from the inlets 8 can be prevented only by closing the inlets 8 with a simple lid. Therefore, the configuration of the hot water storage tank unit 1A can be simplified.

Second Embodiment
Fig.8 (a) is sectional drawing when the hot water storage tank unit which concerns on 2nd Embodiment is seen from the upper plate side of a hot water storage tank, (b) is a figure which shows the flow at the time of injection | pouring of a foam heat insulating material (undiluted | stock solution). (C) is a figure which shows the state in the middle of foaming of a foaming heat insulating material. It is a figure corresponded to FIG. 4, FIG. 5 (a), and FIG.5 (c) of 1st Embodiment, respectively.
As shown in FIGS. 8A to 8C, the hot water storage tank unit 1B according to the second embodiment is replaced with the support member 40 of the hot water storage tank unit 1A according to the first embodiment, and It is In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

Similarly to the support member 40, the support member 41 is a member that engages with the socket 20 and restricts the movement of the hot water storage tank 2 in the front-rear direction (the vertical direction in the drawing of FIG. 8A to 8C). The difference is that the surface fixed to the outer case 3A is not the upper plate 3d but the front plate 3a and the rear plate 3c.
As shown in FIG. 8A, the support member 41 has, for example, a substantially plate-like shape and is formed to be long, and one end thereof is engaged with the socket 20. That is, the engagement peripheral surface of the support member 41 with the socket 20 substantially contacts the outer peripheral shape of the socket 20 so as to contact each other. Further, the other end of the support member 41 is fixed to the outer case 3A by a method such as welding or bolting.
In other words, the support member 41 has an elongated plate shape, engages with the socket 20 for fixing the hot water supply pipe 14 to the hot water storage tank 2, and extends in the vertical direction to the upper surface of the outer box 3A in the vertical direction. And the rear plate 3c, which is the lower surface.
Note that the lateral width of the support member 41 in the left-right direction is as narrow as possible if it has such a lateral width that the engagement with the socket 20 is not released when a foam load is applied to the support member 41. Although it does not inhibit the flowability of the undiluted solution 6a of the foamed heat insulating material 6, it can be said to be preferable.

Even with this configuration, the same operation and effect as the first embodiment can be achieved. That is, as shown in FIG. 8A, in the hot water storage tank unit 1B of the second embodiment, when the inlets 9A and 9B are viewed from the inlet 9 (9A and 9B) inside the outer case 3A, The hot water storage tank 2, piping (hot water discharge pipe 13, hot water supply pipe 14, bathtub return pipe 15), socket 20, and support member 41 are disposed at positions where they can see through the back of outer box 3A (back plate 3c) without being disturbed Be done. According to this, as shown in FIG. 8 (b), when the undiluted solution 6a of the foam heat insulating material 6 is injected from the injection ports 9A, 9B, the undiluted solution 6a of the foam heat insulating material 6 is removed from the injection ports 9A, 9B. Since it can be supplied directly to the inner wall surface 3c1 of 3c, the foam insulation 6 can be filled in the entire gap between the outer case 3A and the hot water storage tank 2 above the hot water storage tank 2. Therefore, the hot water storage tank unit 1B which has high heat insulation performance can be obtained.
Further, as shown in FIG. 8C, the lower end (left side in the drawing) of the hot water storage tank 2 has the inner legs 4A, 4B, 4C fixed to the outer case 3A via the leg receiving portion 4a and The right side of the drawing also has a structure in which the support member 41 is fixed to the outer case 3A via the socket 20. Thereby, even if it receives foaming pressure Pa (refer white arrow) of foaming heat insulating material 6, since movement of hot water storage tank 2 is regulated, position gap phenomena, such as floating of hot water storage tank 2, can be prevented certainly. . Such a support member 41 may be used.

Third Embodiment
Fig.9 (a) is sectional drawing when the hot water storage tank unit which concerns on 3rd Embodiment is seen from the upper plate side of a hot water storage tank, (b) is a figure which shows the flow at the time of injection | pouring of a foam heat insulating material (undiluted | stock solution). (C) is a figure which shows the state in the middle of foaming of a foaming heat insulating material. It is a figure corresponded to FIG. 4, FIG. 5 (a), and FIG.5 (c) of 1st Embodiment, respectively.
As shown in FIGS. 9 (a) to 9 (c), the hot water storage tank unit 1C according to the third embodiment is replaced with the support member 40 of the hot water storage tank unit 1A according to the first embodiment. It is In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

  The supporting member 42 is a member that restricts the movement of the hot water storage tank 2 in the front-rear direction (in the vertical direction of the drawing of FIG. 9A to FIG. 9C) like the supporting member 40. It has an octagonal, hollow, substantially shampoo-hat shape that abuts on. Further, the support member 42 is inserted into the upper mirror plate 2b of the hot water storage tank 2 from the socket 20 side, and the flat portion near the end of the curved surface of the mirror of the upper mirror plate 2b is directly locked to the hot water storage tank 2 It differs from one embodiment.

As shown in FIG. 9A, the support member 42 is in contact with the front plate 3a and the rear plate 3c of the outer case 3A in the front-rear direction (vertical direction in the drawing). The support member 42 is fixed to the front plate 3 a and the rear plate 3 c by a method such as bolting or welding (all not shown).
Further, when the left and right direction of the support member 42 is in contact with the side plates 3b and 3b of the outer box 3A, the support member 42 may use bolting or welding with both of the side plates 3b and 3b (any (Not shown) may be fixed.
A large number of holes 32 are formed in the shampoo hat-shaped hat portion of the support member 42. The holes 32 may have a diameter that allows the undiluted solution 6 a of the foamed heat insulating material 6 to flow. As shown in FIG. 9 (b), when the undiluted solution 6 a of the foam heat insulating material 6 is filled from the nozzle 31 of the injection port 9, the holes 32 do not obstruct the flow of the undiluted solution 6 a of the foam heat insulating material 6. For the purpose of As described above, by perforating the holes 32, the undiluted solution 6a of the foamed heat insulating material 6 passes through the holes 32 and smoothly spreads throughout the inside of the outer case 3A. The reason for forming the support member 42 into an octagonal shape when viewed from the upper plate 3d side (the front side in the drawing of FIG. 9A) is that the flow of the undiluted solution 6a of the foamed heat insulating material 6 To make it smoother.
Summarizing the above, the support member 42 has a ring shape like a shampoo hat and is engaged with and locked to the upper end plate 2b of the hot water storage tank 2, and the ring portion corresponding to the hat portion of the shampoo hat , And the hole 32 is formed in a drilled shape.

Even with this configuration, the same operation and effect as the first embodiment can be achieved. That is, as shown in FIG. 9A, in the hot water storage tank unit 1C of the third embodiment, when the inlets 9A and 9B are viewed from the inlet 9 (9A and 9B) inside the outer case 3A, The hot water storage tank 2, piping (hot water discharge pipe 13, hot water supply pipe 14, bathtub return pipe 15), socket 20, and support member 42 are disposed at a position where the back of outer box 3A can be seen through (back plate 3c) Be done. According to this, as shown in FIG. 9 (b), when the undiluted solution 6a of the foam heat insulating material 6 is injected from the injection ports 9A, 9B, the undiluted solution 6a of the foam heat insulating material 6 is removed from the injection ports 9A, 9B. It can be directly supplied to the inner wall surface 3c1 of 3c through a hole 32 drilled in the hat portion of the support member 42. Thereby, the foam insulating material 6 can be filled in the entire gap between the outer case 3 A and the hot water storage tank 2 above the hot water storage tank 2. Therefore, the hot water storage tank unit 1C which has high heat insulation performance can be obtained.
Further, as shown in FIG. 9C, the lower end (left side in the drawing) of the hot water storage tank 2 fixes the inner legs 4A, 4B, 4C to the outer case 3A via the leg receiving portion 4a and The right side of the drawing also has a structure in which the support member 42 is fixed to the outer case 3A. Thereby, even if it receives foaming pressure Pa (refer white arrow) of foaming heat insulating material 6, since movement of hot water storage tank 2 is regulated, position gap phenomena, such as floating of hot water storage tank 2, can be prevented certainly. . Such a support member 42 may be used.
Fourth Embodiment
Fig.10 (a) is sectional drawing when the hot water storage tank unit which concerns on 4th Embodiment is seen from the upper plate side of a hot water storage tank, (b) is a figure which shows the flow at the time of injection | pouring of a foam heat insulating material (undiluted | stock solution). (C) is a figure which shows the state in the middle of foaming of a foaming heat insulating material. It is a figure corresponded to FIG. 4, FIG. 5 (a), and FIG.5 (c) of 1st Embodiment, respectively.
As shown in FIGS. 10 (a) to 10 (c), the hot water storage tank unit 1D according to the fourth embodiment is replaced with a support member 40 of the hot water storage tank unit 1A according to the first embodiment. 44. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

  The support members 43 and 44 are members that restrict the movement of the hot water storage tank 2 in the front-rear direction (the vertical direction in the drawing of FIGS. 9A to 9C), as with the support member 40. However, with respect to the support member 40 of the first embodiment, however, the support members 43 and 44 are a pair of block bodies that come in contact with, for example, the shell plate 2a of the hot water storage tank 2 and the inner peripheral surface of the outer case 3A. It is different. The contact surfaces of the support members 43 and 44 and the hot water storage tank 2 are not in contact with the body plate 2a, but are in contact with a substantially flat curved surface portion of the upper end plate 2b near the body plate 2a. It is also good. In other words, the support members 43 and 44 may be a pair of block bodies that abut on the upper and lower surfaces in the vertical direction of the hot water storage tank 2. From the viewpoint of securing the flowability of the undiluted solution 6 a of the foamed heat insulating material 6, the block body is not arranged to abut on the entire circumference of the outer periphery of the hot water storage tank 2 but to abut on a part of the outer circumference. Are arranged. The smaller the size of this block, the better.

As shown in FIG. 10A, the support members 43 and 44 are in contact with the rear plate 3c and the front plate 3a of the outer case 3A in the front-rear direction (vertical direction in the drawing). The support members 43 and 44 are respectively fixed to the back plate 3c and the front plate 3a by methods (both not shown) such as bolting and welding.
From the viewpoint of securing the flowability of the undiluted solution 6 a of the foamed heat insulating material 6, the size of the support members 43 and 44 in the left-right direction is preferably as small as possible. Further, from the viewpoint of improving the heat insulation performance, it is more preferable that the support members 43 and 44 be formed of a material having a small thermal conductivity as much as possible.
Further, when the strengths of the support member 43 and the support member 44 are compared, it is preferable that the support member 44 be formed of a block body made of a harder material than the support member 43.
The reason is that the support member 43 only needs to support the own weight of the hot water storage tank 2 before the undiluted solution 6 a of the foamed heat insulating material 6 is filled. When the undiluted solution 6a of the foamed heat insulating material 6 is filled and foaming is started, the bubbling pressure Pa acts on the hot water storage tank 2 as described above, so the load applied to the support member 43 is offset with the bubbling pressure Pa and gradually Decrease. On the contrary, as the foaming of the foam insulation 6 progresses, the support member 44 is gradually subjected to the foaming pressure Pa. Ultimately, support member 44 will need to withstand loads greater than the maximum load that support member 43 will experience. Therefore, it is more desirable that the support member 44 be a block body made of a harder material than the support member 43.
In addition, as a candidate of the material of such a block body, although resin, a hard urethane (heat insulation material), or a wood etc. are mentioned, it does not specifically limit to these.

Even with this configuration, the same operation and effect as the first embodiment can be achieved. That is, as shown in FIG. 10A, in the hot water storage tank unit 1D of the fourth embodiment, when the inlets 9A and 9B are viewed from the inlet 9 (9A and 9B) inside the outer case 3A, A position where you can see through the back of outer box 3A (back plate 3c) without being disturbed by hot water storage tank 2, piping (hot water discharge pipe 13, hot water supply pipe 14, bathtub return pipe 15), socket 20 and support members 43, 44 Will be placed. According to this, as shown in FIG. 10 (b), when the undiluted solution 6a of the foam heat insulating material 6 is injected from the injection ports 9A, 9B, the undiluted solution 6a of the foam heat insulating material 6 is removed from the injection ports 9A, 9B. It can be supplied directly to the inner wall 3c1 of 3c. Thereby, the foam insulating material 6 can be filled in the entire gap between the outer case 3 A and the hot water storage tank 2 above the hot water storage tank 2. Therefore, hot water storage tank unit 1D which has high thermal insulation performance can be obtained.
As shown in FIG. 10 (c), the lower end (left side in the drawing) of the hot water storage tank 2 has the inner legs 4A, 4B, and 4C fixed to the outer case 3A via the leg receiving portion 4a. The right side of the drawing also has a structure in which the support members 43 and 44 are fixed to the outer case 3A. Thereby, even if it receives foaming pressure Pa (refer white arrow) of foaming heat insulating material 6, since movement of hot water storage tank 2 is regulated, position gap phenomena, such as floating of hot water storage tank 2, can be prevented certainly. . Such support members 43 and 44 may be used.

  The embodiments described above are described in detail in order to make the present invention intelligible, and are not necessarily limited to those having all the described configurations. In addition, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and part or all of the configuration of another embodiment can be added to the configuration of one embodiment. It is. Moreover, it is possible to add, delete, and replace other configurations for part of the configurations of the respective embodiments.

  For example, in the present embodiment, the configuration in which the vacuum heat insulating material 5 is wound in contact with the outer peripheral surface of the hot water storage tank 2 is described as an example, but the present invention is not limited thereto. The vacuum heat insulating material 5 may be disposed on (the inner walls of the front plate 3a, the side plate 3b, the rear plate 3c, the upper plate 3d, and the bottom plate 3e). Thereby, not only the side surface (circumferential surface side) of the hot water storage tank 2 but also the upper part and the lower part of the hot water storage tank 2 can be covered in the whole circumference of the hot water storage tank 2.

  Further, as a modification of the first to fourth embodiments, the outer case 3A may be formed in a regular octagonal shape in cross section. As a result, since the distance between the hot water storage tank 2 and the outer case becomes substantially the same in the circumferential direction, the filling amount of the foam insulation 6 filled around the hot water storage tank 2 becomes substantially the same in the front and rear, right and left. The foaming pressure Pa of the foamed heat insulating material 6 acting thereon can be made uniform, and the occurrence of problems such as deformation of the hot water storage tank 2 can be prevented.

  Moreover, although it was set as the structure which makes the support member 40 engage with the socket 20 of the hot water supply pipe 14 in 1st Embodiment, it does not restrict to this. The support member 40 does not matter what kind of installation piping. For example, the hot water discharge pipe 13 and the socket 20 of the bathtub return pipe 15 may be engaged with each other.

  Similarly, in the second embodiment (see FIG. 8A), the support member 41 is engaged with the socket 20 of the hot water supply pipe 14. However, the present invention is not limited to this. The support member 41 does not matter what kind of installation piping. For example, the hot water discharge pipe 13 and the socket 20 of the bathtub return pipe 15 may be engaged with each other. Moreover, although the case where it fixed to the front plate 3a of the outer case 3A and the back plate 3c was mentioned as an example and demonstrated, as an example, the support member 41 fixed with the side plates 3b and 3b of the right and left of the outer case 3A is added It may be configured to

  Further, in the third embodiment (see FIG. 9A), the ring shape of the shampoo hat is described as a substantially octagonal shape, but is not limited thereto. In addition, also regarding the perforation state of the hole 32 of the ring portion of the shampoo hat, the size of the diameter and the number of perforations are appropriately changed so that the fluidity of the undiluted solution 6a of the foam heat insulating material 6 in the outer box 3A can be secured. It is also good. Specifically, for example, the hole 32 in the ring portion of the shampoo hat may be perforated with a particularly large diameter in the lower half and many holes in comparison with the upper half in the vertical direction. In this way, the flowability of the undiluted solution 6a of the foamed heat insulating material 6 is further improved, which is preferable.

  Further, in the fourth embodiment (see FIG. 10A), the support members 43 and 44 are in contact with and fixed to the rear plate 3c and the front plate 3a of the outer box 3A in the front-rear direction (vertical direction in the drawing). Although the example has been described, it is not limited thereto. For example, the left and right directions (the left and right directions in the drawing) may be in contact with the side plates 3b and 3b of the outer box 3A and fixed thereto to prevent positional deviation such as floating of the hot water storage tank 2 in the vertical direction. .

Further, the present invention may be configured by appropriately combining the respective embodiments described above. For example, by combining one of the support members 40 and 41 of the first embodiment or the second embodiment with any one of the support members 42, 43, and 44 of the third embodiment or the fourth embodiment. It can also be configured to include.
In addition, the support member 40 of the first embodiment and the support member 41 of the second embodiment can be combined to have all the support members 40 and 41.
Similarly, the support member 42 of the third embodiment and the support members 43 and 44 of the fourth embodiment may be combined to have all the support members 42, 43 and 44. In this case, the shape of the blocks of the support members 43 and 44 may be devised to change the fixing position with the outer case 3A, and the flowability of the undiluted solution 6a of the foam heat insulating material 6 may be secured.

Further, the present invention is a direct-pressure water heater such as a tap water supply system that heats tap water as hot water by heat exchange between hot water and tap water extracted from the upper part of the hot water storage tank 2 to a hot water supply terminal 18 such as a faucet or a shower The present invention can be applied to any type of water heater.
Moreover, it can apply to the hot-water supply apparatus in which the after-cook heat exchanger HE is provided in the exterior of a hot water storage tank.

1A, 1B, 1C, 1D Hot water storage tank unit 2 Hot water storage tank 2a Body board 2b Upper panel 2c Lower panel 3A Outer case 3a Front plate (upper surface of outer case in vertical direction)
3b Side plate 3c Rear plate (bottom of the outer box in the vertical direction)
3c1 inner wall surface 3d upper plate (surface facing the other end of hot water storage tank)
3e Bottom plate (surface opposite to one end of hot water storage tank)
4, 4A, 4B, 4C Inner leg 4a Leg receiving portion 8, 9 Inlet 3s, 3t Piping cover 5 Vacuum insulation 5a Non-overlapping portion 6 Foam insulation 6a Undiluted solution (foam insulation)
8, 8A, 8B, 9, 9A, 9B Inlet 10 Heat pump unit 11 Water supply pipe (piping)
12 Inlet pipe (piping)
13 Hot water discharge pipe (piping)
14 Hot water supply pipe (piping)
15 Bathtub return pipe (piping)
16 mixing valve 17 hot water supply pipe 18 hot water supply terminal 20 socket 21 notch 31 nozzle 32 hole 40, 41, 42, 43, 44 support member S, s1, s2, s3 gap T1, T2 temperature sensor BT bolt HE heat exchanger G installation Location K water heater Pa bubbling pressure g vertically downward

Claims (1)

A hot water storage tank having a cylindrical side wall,
An outer box for accommodating the hot water storage tank;
A foam insulation of rigid polyurethane foam filled between the hot water storage tank and the outer box;
The outer box is
A first wall portion having a filling hole for filling the foamed heat insulating material;
A second wall portion you face the first wall portion,
A pair of third wall portions surrounding the side wall of the hot water storage tank together with the first wall portion and the second wall portion, an upper plate positioned above, and a bottom plate positioned below;
An inner leg provided in the hot water storage tank and fixed to the bottom plate;
A hot water storage tank unit comprising a support member at an upper portion of the hot water storage tank, between the first wall portion and the hot water storage tank.

Images