JP2015068587A - Hot water storage tank unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hot water storage tank unit with high heat insulation performance.SOLUTION: A hot water storage tank unit includes: a hot water storage tank 2; an outer box 3A storing the hot water storage tank 2; a vacuum heat insulation material 4A provided around the hot water storage tank 2; and a foam heat insulation material 6 filled between the vacuum heat insulation material 4A and the outer box 3A. By filling the foam heat insulation material 6 between the vacuum heat insulation material 4A and the outer box 3A and after that, performing foaming and curing, the vacuum heat insulation material 4A can be closely contacted with the outer surface of the hot water storage tank 2 by foaming pressure of the foam heat insulation material 6, and heat insulation performance of the hot water storage tank 2 can be improved.

Description

  The present invention relates to a hot water storage tank unit provided with a heat insulating material.

  A conventional hot water storage tank unit has been proposed in which the hot water storage tank is covered with a plurality of molded heat insulating materials and the molded heat insulating material is covered with an exterior case (see Patent Document 1). In addition, a hot water storage tank unit has been proposed in which the hot water storage tank is covered with a heat insulating material such as a vacuum heat insulating material (see Patent Document 2).

JP 2011-106791 A Japanese Patent No. 4745269

  However, when the molded heat insulating material described in Patent Document 1 and the vacuum heat insulating material described in Patent Document 2 are used in combination, the vacuum heat insulating material cannot be brought into close contact with the hot water storage tank, for example, between the hot water storage tank and the vacuum heat insulating material. There was a problem that gaps were created between them and heat leakage could not be prevented sufficiently.

  This invention solves the said conventional problem, and it aims at providing the hot water storage tank unit provided with the high heat insulation performance.

  The present invention provides a hot water storage tank, an outer box that houses the hot water storage tank, a foam heat insulating material that is filled between the hot water storage tank and the outer box, and a space between the hot water storage tank and the foam heat insulating material. And a vacuum heat insulating material.

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

It is a whole lineblock diagram showing the water heater provided with the hot water storage tank unit concerning a 1st embodiment. It is a perspective view which shows the inside of a hot water storage tank unit. It is a cross-sectional view of a hot water storage tank unit. (A) is the covering state of the vacuum heat insulating material before filling with the foam heat insulating material, and (b) is the covering state of the vacuum heat insulating material after filling with the foam heat insulating material and foaming. Explanatory drawing of the filling method of a foam heat insulating material is shown, (a) is a 1st method, (b) is a 2nd method, (c) is a 3rd method. It is explanatory drawing which shows the 4th method of the filling method of a foam heat insulating material. It is sectional drawing which shows the inside of the hot water storage tank unit which concerns on 2nd Embodiment. It is sectional drawing which shows the inside of the hot water storage tank unit which concerns on 3rd Embodiment. It is sectional drawing which shows the inside of the hot water storage tank unit which concerns on 4th Embodiment. It is sectional drawing which shows the inside of the hot water storage tank unit which concerns on 5th Embodiment. It is sectional drawing which shows the inside of the hot water storage tank unit which concerns on 6th Embodiment. It is sectional drawing which shows the inside of the hot water storage tank unit which concerns on 7th Embodiment.

  Hereinafter, hot water storage tank units 1 </ b> A to 1 </ b> G according to embodiments of the present invention will be described with reference to FIGS. 1 to 12. In FIG. 2 and subsequent figures, illustration of piping connected to the hot water storage tank is omitted.

(First embodiment)
First, the water heater 1 provided with the hot water storage tank unit 1A will be described with reference to FIG. FIG. 1 is an overall configuration diagram illustrating a water heater provided with a hot water storage tank unit according to the first embodiment.
As shown in FIG. 1, the water heater 1 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 box 3A, a vacuum heat insulating material 4A, and a foam heat insulating material 6 (portions indicated by dots).

  A water supply pipe 11 into which tap water is introduced is connected to the lower part of the hot water storage tank 2. The water in the lower part of the hot water storage tank 2 is introduced into the heat pump unit 10 by the pump P through the water inlet pipe 12. Hot water heated by the heat pump unit 10 is introduced into the upper part of the hot water storage tank 2 through the hot water discharge pipe 13.

  The temperature of the hot water in such a hot water storage tank 2 increases, for example, as it goes upward from the lower side in the vertical direction. That is, the temperature distribution is relatively low, medium and high from the lower part to the upper part in the hot water storage tank 2. For example, the temperature is about 90 ° C. at the upper part of the hot water storage tank 2 and about 50 ° C. at the intermediate part.

  The heat pump unit 10 is for boiling water taken out from the hot water storage tank 2. For example, a compressor that compresses refrigerant (for example, carbon dioxide) to high temperature and high pressure, and condenses the refrigerant discharged from the compressor. A condenser that is heated by exchanging heat with water from the hot water storage tank 2, a pressure reducing valve that decompresses the refrigerant from the condenser, an evaporator that absorbs heat in the atmosphere and evaporates the decompressed refrigerant, It is configured with.

  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 branch water supply pipe 15 branched and connected to the water supply pipe 11 through the mixing valve 16, and then the hot water supply pipe The hot water is discharged from the hot water supply terminal 18 through 17.

  The outer box 3A has a space for accommodating the hot water storage tank 2, and includes a pipe cover 3s on the front side (front side). The pipe cover 3 s has a space for accommodating a hot water discharge pipe 13, a branch water supply pipe 15, a mixing valve 16, a hot water supply pipe 17 and the like from the heat pump unit 10 toward the hot water storage tank 2.

  FIG. 2 is a perspective view showing the inside of the hot water storage tank unit according to the first embodiment. In addition, in FIG. 2, the state inside 3 A of outer boxes when the pipe cover 3s (refer FIG. 1) side is cut | disconnected is shown. Moreover, in FIG. 2, illustration of the foam heat insulating material 6 (refer FIG. 1) and various piping is abbreviate | omitted.

  As shown in FIG. 2, the hot water storage tank 2 includes a cylindrical body plate 2a and a substantially bowl-shaped (hemispherical, bowl-shaped) upper end plate 2b that covers the upper opening of the body plate 2a with a material such as stainless steel, for example. The lower end plate 2c having a generally bowl shape (hemispherical, bowl-shaped) covering the lower opening of the body plate 2a is welded.

  The hot water storage tank 2 includes three leg portions 2d, 2d, and 2d, and the lower end of each leg portion 2d is fixed to the outer box 3A with a bolt or the like. Note that the number of the leg portions 2d is not limited to three, and may be four or more.

  Further, temperature sensors 5a and 5b (thermistors) 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 5 a detects the boiling temperature that is the temperature of the upper part of the hot water storage tank 2. The lower temperature sensor 5 b detects the temperature of the intermediate temperature water in the intermediate portion of the hot water storage tank 2. The number of the temperature sensors 5a and 5b is not limited to the present embodiment, and is not limited to the upper part of the hot water storage tank 2, but is configured so that three or more temperature sensors are provided from the upper part to the lower part of the hot water storage tank 2. There may be.

  The outer box 3A is made of a steel plate that accommodates the hot water storage tank 2, and is located at the front plate 3a (see FIG. 1) located at the front, the side plates 3b, 3b located at the side, and the rear of the hot water storage tank 2. The rear plate (back plate) 3c, the upper plate (top plate) 3d positioned above, and the bottom plate 3e positioned below are configured in a vertically long rectangular box shape.

  The piping cover 3s is provided in front of the outer box 3A. For example, the front cover of the outer box 3A is constituted by a front plate located on the front side, a side plate located on the left and right sides, an upper plate located on the upper side, and a bottom plate located on the bottom side. It is comprised so that 3a (refer FIG. 1) may be covered.

  The vacuum heat insulating material 4 </ b> A has a sheet shape and is wound around the body plate 2 a of the hot water storage tank 2. Moreover, 4 A of vacuum heat insulating materials are comprised with the core material which consists of glass fibers, such as glass wool, the outer packaging material which wraps this core material. The outer packaging material is made of an aluminum laminate film having gas barrier properties.

  Further, the vacuum heat insulating material 4A is formed such that the circumferential length thereof is shorter than the entire circumference of the hot water storage tank 2, and the temperature sensors 5a and 5b are positioned in the non-overlapping portion 4a that does not overlap the hot water storage tank 2. It is wound around the hot water storage tank 2. This is for facilitating replacement of the temperature sensors 5a and 5b when a malfunction occurs in the temperature sensors 5a and 5b.

FIG. 3 is a cross-sectional view of the hot water storage tank unit.
As shown by dot display in FIG. 3, the foam heat insulating material 6 is provided between the vacuum heat insulating material 4 </ b> A wound around the hot water storage tank 2 and the outer box 3 </ b> A. The foam heat insulating material 6 is not a pre-formed heat insulating material (molded heat insulating material) such as polystyrene foam, but a foam heat insulating space between the hot water storage tank 2 and the outer box 3A is filled with a liquid heat insulating material. It is configured by foaming.

  Further, in the region of the body plate 2a around which the vacuum heat insulating material 4A is wound, the foam heat insulating material 6 is filled between the vacuum heat insulating material 4A wound around the hot water storage tank 2 and the outer box 3A, and the vacuum heat insulating material 4A is In the non-rolled non-overlapping portion 4a, and the upper end plate 2b and the lower end plate 2c (see FIG. 2), the foam heat insulating material 6 is filled between the hot water storage tank 2 and the outer box 3A.

  As the foam heat insulating material 6, for example, a rigid polyurethane foam is used. 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 foaming agent include cyclopentane, water, and carbon dioxide gas. The foam heat insulating material 6 is not limited to the rigid polyurethane foam.

  Further, in the front part of the hot water storage tank unit 1A, a gap s1 is formed between the outer box 3A and the hot water storage tank 2 closest to the outer box 3A, and the foamed heat insulating material 6 is filled in the gap s1. Further, the non-overlapping portion 4a around which the vacuum heat insulating material 4A of the hot water storage tank 2 is not wound is also filled with the foam heat insulating material 6.

  Further, on both sides of the hot water storage tank unit 1A, gaps s2 and s2 are formed between the outer box 3A and the vacuum heat insulating material 4A closest to the outer box 3A, and the foam heat insulating material 6 is filled in each gap s2. It has come to be. Similarly, in the rear part of the hot water storage tank unit 1A, a gap s3 is formed between the outer box 3A and the vacuum heat insulating material 4A closest to the outer box 3A, and the foamed heat insulating material 6 is filled in the gap s3. .

  As described above, by providing the gap s1 between the hot water storage tank 2 and the outer box 3A and the gaps s2 and s3 between the vacuum heat insulating material 4A and the outer box 3A, the heat in the hot water storage tank 2 is vacuum insulated. Leakage to the outside of the outer box 3A through the material 4A can be suppressed.

FIG. 4A shows a covering state of the vacuum heat insulating material before filling with the foam heat insulating material, and FIG. 4B shows a covering state of the vacuum heat insulating material after filling with the foam heat insulating material.
By the way, the vacuum heat insulating material 4A is excellent in heat insulating performance as compared with the foam heat insulating material 6 or the like, but is compressed and cured by vacuuming or the like. It is difficult to bend the hardened material arbitrarily as described above, or to place it so as to be tightly fixed to the cylindrical shape of the outer surface of the hot water storage tank 2.

  Therefore, in this embodiment, by using the vacuum heat insulating material 4A and the foam heat insulating material 6 together, the vacuum heat insulating material 4A is brought into close contact with the outer peripheral surface of the hot water storage tank 2 by utilizing the pressure at the time of foaming of the foam heat insulating material 6. Can be made. Moreover, by using the foam heat insulating agent 6, the gaps between the gaps s1 to s3, the upper end plate 2b, and the lower end plate 2c that cannot be covered by the vacuum heat insulating material 4A can be filled with the foam heat insulating material 6. Thereby, the improvement of heat insulation performance can be aimed at.

  That is, as shown in FIG. 4 (a), when the vacuum heat insulating material 4A is wound around the outer surface of the hot water storage tank 2 before filling the foam heat insulating material 6, the space between the outer surface of the hot water storage tank 2 and the vacuum heat insulating material 4A. A gap S is formed in the gap. However, as shown in FIG. 4B, the foaming pressure Pa when the foaming heat insulating material 6 is foamed by filling the foaming heat insulating material 6 between the outer box 3A and the vacuum heat insulating material 4A is the vacuum heat insulating material. By acting in a direction in which 4A is pressed against the hot water storage tank 2, the vacuum heat insulating material 4A comes into close contact with the outer surface of the hot water storage tank 2.

  In this way, the adhesion of the vacuum heat insulating material 4A to the hot water storage tank 2 can be enhanced, and the heat insulation performance can be improved in the hot water storage tank unit 1A. This makes it possible to obtain a hot water storage tank unit 1A having high energy saving performance.

  FIGS. 5A and 5B show a filling method of the foam heat insulating material. FIG. 5A shows the first method, FIG. 5B shows the second method, and FIG. 5C shows the third method. 5 indicate the direction of the hot water storage tank 2. Moreover, in FIG. 5, illustration of the vacuum heat insulating material 4A is abbreviate | omitted.

  As shown in FIG. 5A, the rear plate 3c of the outer box 3A is formed with filling ports 3c1 and 3c2 that serve as inlets when the foamed heat insulating material 6 is filled. The filling port 3c1 is formed in the upper part of the outer box 3A, and the filling port 3c2 is formed in the lower part of the outer box 3A.

  And in the state before attaching piping cover 3s (refer to Drawing 1), upper and lower sides of outer case 3A which stored hot water storage tank 2 are horizontal, and front board 3a (front side of outer case 3A) is horizontal. Lay down so that it faces down.

  In the state in which the outer box 3A is laid down in this way, the periphery of the outer box 3A is covered with a foam management jig (also referred to as yay) 30 (see the two-dot chain line in FIG. 5A). The foam management jig 30 includes a plate-shaped jig that surrounds the entire periphery of the outer box 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 is inserted into the filling ports 3c1 and 3c2 from the outside of the foam management jig 30, and the liquid foam heat insulating material 6 is injected from the filling ports 3c1 and 3c2.

  Thereby, in the outer box 3A, the liquid foam heat insulating material 6 starts to accumulate from the front side (the lower side in the drawing) of the hot water storage tank 2 and rises toward the rear side (the upper side in the drawing) of the hot water storage tank 2. When the foam heat insulating material 6 is filled in the outer box 3A, foaming of the foam heat insulating material 6 is started. At this time, since the entire outer surface of the outer box 3A is suppressed by the foam management jig 30, it is possible to prevent the outer box 3A from expanding (deforming) due to the foaming pressure when the foam heat insulating material 6 is foamed. it can. The foam heat insulating material 6 is cured after the foaming is completed.

  Moreover, as shown in FIG.5 (b), you may fill with the foam heat insulating material 6 in the state which inclined 3 A of outer boxes. That is, the filling port 3c2 serving as an inlet for filling the foam heat insulating material 6 is provided only in the lower part of the rear plate 3c of the outer box 3A. Further, when filling the foam heat insulating material 6, the hot water storage tank 2 is placed so that the vertical direction of the hot water storage tank 2 is inclined with respect to the horizontal, and the lower part of the hot water storage tank 2 is positioned above the upper part in the vertical direction. Install. Furthermore, the hot water storage tank 2 is installed so that the front plate 3a of the outer box 3A faces downward.

  By the way, since high temperature water (hot hot water) is stored from the upper side in the hot water storage tank 2, it is desirable that the heat insulation of the upper part of the hot water storage tank 2 is higher than the heat insulation of the lower part. Therefore, by filling the foam heat insulating material 6 by the method shown in FIG. 5 (b), the foam heat insulating material 6 first starts to accumulate from the upper side of the hot water storage tank 2 in the outer box 3 </ b> A. Thereby, the density of the foam heat insulating material 6 located above the hot water storage tank 2 becomes higher than the density of the foam heat insulating material 6 located below the hot water storage tank 2. Since the heat insulation performance is higher when the density of the foamed heat insulating material 6 is higher than when the density is lower, the heat insulation performance at the upper part of the hot water storage tank 2 can be improved, and the hot water at the upper part in the hot water storage tank 2 can be hardly cooled. For this reason, in the hot water heater 1 (see FIG. 1), the number and time of boiling can be reduced, and it becomes possible to obtain the hot water storage tank unit 1A (see FIG. 1) having high energy saving performance.

  Moreover, as shown in FIG.5 (c), it may replace with the filling port 3c2 of FIG.5 (b), and the structure used as the filling port 3c3 may be sufficient. As described above, the filling port 3c3 is provided at the approximate center of the hot water storage tank 2 in the vertical direction. Even in this case, similarly to the method shown in FIG. 5 (b), the density of the foam insulation 6 at the upper part of the hot water storage tank 2 can be made higher than the lower part, and the heat insulation performance at the upper part of the hot water storage tank 2 can be improved. It is possible to make it difficult to cool the hot water in the hot water storage tank 2.

  Moreover, as shown in FIG. 6, you may form the filling ports 3a1 and 3a2 used as the inlet at the time of filling with the foam heat insulating material 6 in the front board 3a of 3 A of outer boxes. The filling port 3a1 is formed in the upper part of the outer box 3A, and the filling port 3a2 is formed in the lower part of the outer box 3A. And in the state before attaching piping cover 3s (refer to Drawing 1), upper and lower sides of outer case 3A which stored hot water storage tank 2 are horizontal, and back board 3c (the rear side of outer case 3A) Lay down so that is facing down.

  By the way, the hot water storage tank unit 1A is generally installed in a place exposed to outside air (rain) such as outdoors for home use or the like. Moreover, since the foam heat insulating material 6 has a property which is weak to water, it is desirable that it is the structure which does not contact with water. Therefore, as shown in FIG. 6, the filling ports 3a1 and 3a2 of the foam heat insulating material 6 are formed in the front plate 3a, and after the filling and foaming of the foam heat insulating material is completed, the filling ports 3a1 and 3a2 are connected to the pipe cover 3s. (See FIG. 1). Therefore, the filling ports 3a1 and 3a2 serving as water (rainwater) inflow ports are covered with the piping cover 3s, and the water from the filling ports 3a1 and 3a2 can be obtained without taking measures against water ingress to the filling ports 3a1 and 3a2. Can be prevented. Therefore, the configuration of the hot water storage tank unit 1A can be simplified.

  In addition, about the direction of the hot water storage tank 2 in the case of filling with the foam heat insulating material 6, it is not limited to above-described embodiment, For example, the filling port of the foam heat insulating material 6 is provided in the bottom plate 3e of the outer box 3A, You may make it fill with the foam heat insulating material 6 in the state in which the upper part of the hot water storage tank 2 became the downward direction of the perpendicular direction (gravity direction). Also in this case, the density of the foam heat insulating material 6 in the upper part of the hot water storage tank 2 can be made higher than that in the lower part, and the heat insulating property of the upper part of the hot water storage tank 2 can be improved.

  As described above, according to the hot water storage tank unit 1A according to the first embodiment, the hot water storage tank 2, the outer box 3A for housing the hot water storage tank 2, the vacuum heat insulating material 4A provided around the hot water storage tank 2, By providing the foam heat insulating material 6 filled between the vacuum heat insulating material 4A and the outer box 3A, the vacuum heat insulation is achieved by the foaming pressure Pa when the foam heat insulating material 6 is foamed (see FIG. 4B). By pressing the material 4A against the hot water storage tank 2, the vacuum heat insulating material 4A can be brought into close contact with the hot water storage tank 2 and the heat insulation performance can be improved.

  Moreover, in 1st Embodiment, the density of the foam heat insulating material 6 is comprised so that the upper part may become higher than the lower part of the hot water storage tank 2 (refer FIG.5 (b) and FIG.5 (c)). According to this, since the heat insulation performance of the upper part of the hot water storage tank 2 can be improved, it is possible to make it difficult to cool the hot water accumulated in the upper part of the hot water storage tank 2.

  Moreover, in 1st Embodiment, the piping cover 3s in which piping (The hot water pipe 13, the hot water supply pipe 14, the branch water supply pipe 15, and the hot water supply pipe 17) connected with the hot water storage tank 2 is accommodated, and foam insulation is provided in the outer box 3A. Filling ports 3a1 and 3a2 when the material 6 is filled are provided on the pipe cover 3s side. According to this, since the filling ports 3a1 and 3a2 are covered by the pipe cover 3s, it is possible to prevent the foam heat insulating material 6 from coming into contact with water without taking measures against water ingress to the filling ports 3a1 and 3a2. it can. Therefore, the configuration of the hot water storage tank unit 1A can be simplified.

(Second Embodiment)
FIG. 7 is a cross-sectional view showing the inside of the hot water storage tank unit according to the second embodiment.
As shown in FIG. 7, the hot water storage tank unit 1B is configured to be provided on the inner surface of the outer box 3A in place of the configuration in which the vacuum heat insulating material 4A of the hot water storage tank unit 1A according to the first embodiment is provided on the outer surface of the hot water storage tank 2. Is. Note that in the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  The vacuum heat insulating material 4B is provided on the inner surface of the front plate 3a, the inner surfaces of the side plates 3b and 3b, and the inner surface of the rear plate 3c. Moreover, the vacuum heat insulating material 4B is provided on the entire surface of the side plates 3b, 3b and the rear plate 3c, for example. The hot water storage tank unit 1B has a non-overlapping portion 4b in which the vacuum heat insulating material 4B is not provided on the front plate 3a.

  In 2nd Embodiment, the vacuum heat insulating material 4B is closely_contact | adhered to the inner surface of 3 A of outer boxes by using the foaming pressure at the time of foaming of the foam heat insulating material 6 by using the vacuum heat insulating material 4B and the foam heat insulating material 6 together. Can be made. Further, the hot water storage tank 2 can be filled without forming a gap with the foam heat insulating material 6. Thereby, the hot water storage tank unit 1B which improved the heat insulation performance can be obtained.

(Third embodiment)
FIG. 8 is a cross-sectional view showing the inside of the hot water storage tank unit according to the third embodiment.
As shown in FIG. 8, the hot water storage tank unit 1C is a vacuum heat insulating material 4B instead of the vacuum heat insulating material 4A of the hot water storage tank unit 1A according to the first embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The hot water storage tank unit 1C has a substantially triangular non-overlapping portion 4c in which the vacuum heat insulating material 4B does not overlap the temperature sensors 5a, 5b of the hot water storage tank 2. According to this, the coverage of the vacuum heat insulating material 4B with respect to the hot water storage tank 2 can be increased, and the heat insulation performance of the hot water storage tank unit 1C can be further improved. In addition, a coverage is a ratio of the place which is winding the vacuum heat insulating agent 4, and the place which is not wound.

(Fourth embodiment)
FIG. 9 is a cross-sectional view showing the inside of the hot water storage tank unit according to the fourth embodiment.
As shown in FIG. 9, the hot water tank unit 1D is an outer box 3B instead of the outer box 3A of the hot water tank unit 1A according to the first embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The outer box 3B is formed in a regular octagonal shape when viewed in cross section, and includes a front plate 3f positioned on the front side, side plates 3g and 3g positioned on the left and right sides, a rear plate 3h positioned on the rear side, a front plate 3f and side plates 3g and 3g. The front inclined plates 3i and 3i for connecting the rear plate 3h, and the rear inclined plates 3j and 3j for connecting the rear plate 3h and the side plates 3g and 3g are included.

  Further, a gap s1 filled with the foam heat insulating material 6 is formed between the hot water storage tank 2 and the front plate 3f. Between the hot water storage tank 2 and the side plates 3g, 3g, gaps s2, s2 filled with the foam heat insulating material 6 are formed. Between the hot water storage tank 2 and the rear plate 3h, a gap s3 filled with the foam heat insulating material 6 is formed. Between the hot water storage tank 2 and the front inclined plates 3i, 3i, gaps s4, s4 filled with the foam heat insulating material 6 are formed. Between the hot water storage tank 2 and the rear inclined plates 3j and 3j, gaps s5 and s5 filled with the foam heat insulating material 6 are formed.

  Thus, the gaps s1, s2, s3, s4, and s5 are formed so that the distance from the hot water storage tank 2 is substantially the same. Thereby, since the filling amount of the foam heat insulating material 6 filled around the hot water storage tank 2 becomes substantially the same, the foaming pressure of the foam heat insulating material 6 acting on the hot water storage tank 2 can be made uniform, and the hot water storage tank 2 is deformed. It is possible to prevent the occurrence of problems such as.

  Further, in the embodiment shown in FIG. 9, the provision of the front inclined plates 3i, 3i allows the substantially triangular spaces R1, R1 to be used as the piping space, so that the protrusion of the piping cover 3t protruding forward is shortened. can do. Thereby, depth dimension L2 of hot water storage tank unit 1D can be shortened compared with depth dimension L1 (refer FIG. 3) in the case of hot water storage tank unit 1A, and size reduction of hot water storage tank unit 1D is attained.

(Fifth embodiment)
FIG. 10 is a cross-sectional view showing the inside of the hot water storage tank unit according to the fifth embodiment.
As shown in FIG. 10, the hot water storage tank unit 1E is configured such that the vacuum heat insulating material 4C of the hot water storage tank unit 1D according to the fourth embodiment is provided on the outer surface of the hot water storage tank 2, and the vacuum heat insulating material 4C is replaced with the inner surface of the outer box 3B. It is made into the structure provided in. Note that in the fifth embodiment, identical symbols are assigned to configurations similar to those in the fourth embodiment and redundant descriptions are omitted. In the embodiment shown in FIG. 10, in addition to the same effect as that of the second embodiment, the same effect as that of the fourth embodiment can be obtained.

(Sixth embodiment)
FIG. 11 is a cross-sectional view showing the inside of the hot water storage tank unit according to the sixth embodiment.
As shown in FIG. 11, the hot water tank unit 1F is an outer box 3C instead of the outer box 3A of the hot water tank unit 1A according to the first embodiment. In addition, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  The outer box 3C is formed in a hexagonal shape in sectional view, and includes a front plate 3f located on the front side, side plates 3k and 3k located on both left and right sides, a rear plate 3c located on the rear side, a front plate 3f and side plates 3k and 3k. The front inclined plates 3i and 3i to be connected are included.

  Further, in the embodiment shown in FIG. 10, as in the fourth embodiment and the fifth embodiment, by providing the front inclined plates 3i and 3i, the substantially triangular spaces R1 and R1 can be used as the piping space. Therefore, the protrusion of the piping cover 3t protruding forward can be shortened. Thereby, depth dimension L2 of hot water storage tank unit 1D can be shortened compared with depth dimension L1 (refer FIG. 3) in the case of hot water storage tank unit 1A, and size reduction of hot water storage tank unit 1D is attained.

(Seventh embodiment)
FIG. 12 is a sectional view showing the inside of a hot water storage tank unit according to the seventh embodiment.
As shown in FIG. 12, the hot water storage tank unit 1G is configured such that the vacuum heat insulating material 4D of the hot water storage tank unit 1F according to the sixth embodiment is provided on the outer surface of the hot water storage tank 2 and the vacuum heat insulating agent 4D is replaced with the inner surface of the outer box 3C. It is made into the structure provided in. Note that in the seventh embodiment, identical symbols are assigned to configurations similar to those in the sixth embodiment and redundant descriptions are omitted. In the seventh embodiment, in addition to the effects of the sixth embodiment, the effects of the fifth embodiment can be obtained.

  The present invention is not limited to the above-described embodiment, and the configuration can be changed as appropriate without departing from the spirit of the present invention. For example, in the present embodiment (see FIG. 1), an example in which the hot water in the hot water storage tank 2 is directly used for hot water supply is described as an example. However, the present invention is not limited to this, and the hot water in the hot water storage tank 2 is used. It is also possible to supply hot water by exchanging heat with water supplied from the water supply pipe 11 (so-called direct pressure hot water supply type).

  Moreover, although not shown in figure, the structure which adds a vacuum heat insulating material to the inner surface of the upper board 3d (refer FIG. 1) in addition to the front board 3a, side board 3b, 3b, and the rear board 3c may be sufficient.

  In addition, instead of the outer box 3B having a regular octagonal shape in cross section, a circular (cylindrical) outer box concentric with the hot water storage tank 2 may be used.

  In addition, the present invention may be configured by appropriately combining two or more of the first to seventh embodiments described above.

1A, 1B, 1C, 1D, 1E, 1F, 1G Hot water storage tank unit 2 Hot water storage tank 3A, 3B, 3C Outer box 3a Front plate 3b Side plate 3c Rear plate 3d Top plate 3e Bottom plate 3a1, 3a2 Filling port 3s Piping cover 4A, 4B , 4C, 4D Vacuum insulation 5a, 5b Temperature sensor 6 Foam insulation

Claims (4)

A hot water storage tank,
An outer box containing the hot water storage tank;
A vacuum heat insulating material provided around the hot water storage tank;
Foam heat insulating material filled between the vacuum heat insulating material and the outer box,
A hot water storage tank unit comprising: A hot water storage tank,
An outer box containing the hot water storage tank;
A vacuum heat insulating material provided on the inner surface of the outer box;
Foam heat insulating material filled between the hot water storage tank and the vacuum heat insulating material,
A hot water storage tank unit comprising:   The hot water storage tank unit according to claim 1 or 2, wherein the density of the foam heat insulating material is higher in the upper part of the hot water storage tank than in the lower part. The outer box includes a pipe cover that accommodates a pipe connected to the hot water storage tank,
The hot water storage tank according to any one of claims 1 to 3, wherein the outer box is provided with a filling port on the piping cover side when the foam heat insulating material is filled. unit.

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