JP2016044869A - Hot water storage tank unit - Google Patents

Abstract

To provide a hot water storage tank unit capable of preventing external corrosion of a pipe material when a foaming insulating material is filled around the pipe.
SOLUTION: A hot water storage tank 2, an outer box 3A for housing the hot water storage tank 2, a foam heat insulating material 6 formed by foaming a foaming liquid 6a between the outer box 3A and the hot water storage tank 2, and And piping 11, 12, 13, 14, 15 that are accommodated in the outer box 3 </ b> A and have corrosion resistance against amines or ammonia generated by the decomposition of the foam heat insulating material 6.
[Selection] Figure 3

Description

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

  As a conventional hot water storage tank unit, one in which piping constituting a reheating circuit, a hot water filling circuit, and a general hot water supply circuit is formed using stainless steel has been proposed (see Patent Document 1).

JP 2010-210157 A

  However, Patent Document 1 is intended to prevent corrosion of the inner surface of the piping material of the water heater, and when the foam insulation is filled around the piping, regarding the corrosion prevention of the outer surface of the piping material, There is no description or suggestion.

  The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a hot water storage tank unit capable of preventing external corrosion of piping material when the foam insulation is filled around the piping. And

  The present invention includes a hot water storage tank, an outer box that accommodates the hot water storage tank, a foam insulation material that is foamed by injecting a foaming liquid between the outer box and the hot water storage tank, and accommodated inside the outer box. And a pipe having corrosion resistance against amines or ammonia generated by the decomposition of the foam heat insulating material.

  ADVANTAGE OF THE INVENTION According to this invention, when a foaming heat insulating material is filled around piping, the hot water storage tank unit which can prevent the outer surface corrosion of a piping raw material can be provided.

It is a whole lineblock diagram showing the hot water supply machine provided with the hot water storage tank unit concerning an embodiment. It is a perspective view which shows the inside of the hot water storage tank unit which concerns on embodiment. It is the front view which looked at the hot water storage tank unit which concerns on embodiment from the inlet side. It is sectional drawing when the hot water storage tank unit which concerns on embodiment is seen from the upper plate side of the hot water storage tank. (A) is a figure which shows the flow of the foam heat insulating material (foaming liquid) at the time of injection | pouring, (b) is a figure which shows the state of the foam heat insulating material (foaming liquid) after completion | finish of injection | pouring, (c) is foaming in the middle of foaming It is a figure which shows the state of a heat insulating material. It is a cross-sectional view of the hot water storage tank unit according to the embodiment. (A) is a coating state of the vacuum heat insulating material before injection of the foam heat insulating material (foaming liquid), and (b) is a covering state of the vacuum heat insulating material after injection of the foam heat insulating material (foaming liquid) and foaming.

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

(Description of Embodiment)
First, a hot water heater K provided with a hot water storage tank unit 1A according to the embodiment 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 an 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 box 3A, an inner leg (leg part) 4, a vacuum heat insulating material 5, and a foam heat insulating material 6.

  A water supply pipe 11 (pipe) into which tap water is introduced is connected to the lower part of the hot water storage tank 2. Water in the lower part of the hot water storage tank 2 is introduced into the heat pump unit 10 via a water inlet pipe 12 (pipe) by a pump (not shown). 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 a refrigerant (for example, carbon dioxide) to high temperature and 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 exchanging heat with the water from the tank 2, a pressure reducing valve that decompresses the refrigerant from the condenser, and a refrigerant that absorbs heat in the atmosphere and evaporates the decompressed refrigerant And an evaporator to be configured. In the embodiment, the heat pump unit 10 is described as an example of the heating unit. However, the heating unit may be heated by an electric heater or gas.

  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 water from a branch water supply pipe (not shown) branched and connected to the water supply pipe 11 through 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 embodiment, 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. However, the hot water in the hot water storage tank 2 is not used 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) used as a heat medium for replacement (heating).

  The outer box 3A has a space for accommodating the hot water storage tank 2, and a pipe cover 3s is attached to the front (front side). The piping cover 3s has a space for accommodating a hot water discharge pipe 13, a branch water supply pipe (not shown), 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.

Drawing 2 is a perspective view showing the inside of hot water storage tank unit 1A concerning an embodiment. FIG. 2 shows a state in which the front plate 3a side of the outer box 3A is cut out, and illustration of various pipes is omitted.
As shown in FIG. 2, the hot water storage tank 2 is made of, for example, a cylindrical shell plate 2a and a substantially bowl-shaped (hemispherical, bowl-shaped) upper portion covering the upper opening of the shell plate 2a with a material having corrosion resistance such as stainless steel. It is configured by welding three members of a mirror plate 2b and a substantially bowl-shaped (hemispherical, bowl-shaped) lower mirror plate 2c that covers the lower opening of the body plate 2a.

  The hot water storage tank 2 is supported by the bottom plate 3e of the outer box 3A through three inner legs 4 (4A), 4 (4B), and 4 (4C). The lower ends of the inner legs 4 are fixed to the bottom plate 3e of the outer box 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 and T2 (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 T <b> 1 detects a boiling temperature that is the temperature of the upper part of the hot water storage tank 2. The lower temperature sensor T <b> 2 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 T1 and T2 is not limited to the embodiment, and is not limited to the upper part of the hot water storage tank 2, but is a configuration in which three or more temperature sensors are provided from the upper part to the lower part of the hot water storage tank 2. May be.

  The outer box 3A is made of a steel plate that accommodates the hot water storage tank 2. For example, the front plate 3 a (refer to FIG. 1), the side plates 3 b and 3 b that are located on the side, and the rear side of the hot water storage tank 2. The rear plate (back plate) 3c (see also FIG. 1), the upper plate (top plate) 3d located above, and the bottom plate 3e located below (bottom side) are configured in a vertically long rectangular box shape. . However, the shape of the outer box 3A is not particularly limited to this, and may be, for example, a polygonal shape when viewed in cross section.

  The piping cover 3s is provided in front of the outer box 3A, and has a shape that covers the entire area from the upper end to the lower end of the front plate 3a (see FIG. 1) of the outer box 3A. Moreover, the height and width (left-right direction) of the piping cover 3s are configured similarly to the height and width of the outer box 3A. Thereby, in a state where the pipe cover 3s is attached to the outer box 3A, it has a vertically long rectangular parallelepiped shape in appearance.

  Moreover, the foaming liquid 6a of the foam heat insulating material 6 such as urethane foaming liquid (see FIG. 1, FIG. 4, and FIGS. 5A to 5C) is injected into the lower portion of the front plate 3a of the outer box 3A. The inlets 8 and 8 are formed through the front plate 3a so as to communicate with the inside of the outer box 3A. Further, the inlets 9 and 9 for injecting the foaming liquid 6a of the foam heat insulating material 6 also penetrate the front plate 3a so as to communicate with the inside of the outer box 3A in the upper part of the front plate 3a of the outer box 3A. Is formed. The inlets 8, 8, 9, 9 are holes necessary for injecting the foaming liquid 6 a of the foam heat insulating material 6, and a lid (cover) or the like after the injection / foaming of the foamed liquid 6 a of the foam heat insulating material 6. It can be closed with.

  The foam heat insulating material 6 is not a pre-formed heat insulating material (molded heat insulating material) such as foamed polystyrene, but injects the foaming liquid 6a of the foam heat insulating material into the foam heat insulating space between the hot water storage tank 2 and the outer box 3A, It is comprised by making it foam after injection | pouring. 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 foams 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.

The inner leg 4 is bent in an L shape in cross section (so-called L-shaped angle) and extends along the axial direction of the hot water storage tank 2 from above the lower end plate 2c toward the bottom plate 3e. Has been placed. Moreover, the inner leg 4 has a leg receiving part 4a, and the leg receiving part 4a is fixed to the outer surface of the hot water storage tank 2 by welding. The leg receiving portion 4a is also bent and formed 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.

  Moreover, each inner leg 4 is arrange | positioned around the hot water storage tank 2 at intervals of 120 degrees, and one inner leg 4 (4A) is arrange | positioned at the front-end part (part located most forward) of the hot water storage tank 2, The other inner legs 4 (4B, 4C) are arranged so as to face diagonally rearward of the hot water storage tank 2.

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

  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. Moreover, the vacuum heat insulating material 5 is comprised by coat | covering with the core material which consists of glass fibers, such as glass wool, the outer packaging material which wraps this core material, etc., and the inside of an outer packaging material is evacuated. The outer packaging material is made of an aluminum laminate film having gas barrier properties.

  Further, the vacuum heat insulating material 5 is formed such that, for example, the length in the axial direction and the circumferential direction is shorter than the length in the axial direction and the entire circumference of the hot water storage tank 2 and does not overlap with the hot water storage tank 2. The leg holder 4a and the temperature sensors T1, T2 are wound around the hot water storage tank 2. The reason for this is to secure the fixing of the leg receiving portion 4a and the hot water storage tank 2. Further, this is for facilitating replacement of the temperature sensors T1 and T2 when trouble occurs in the temperature sensors T1 and T2. However, the mounting position of the vacuum heat insulating material 5 is not particularly limited to this. For example, the vacuum heat insulating material 5 may be attached to the inner peripheral surface of the outer box 3A.

3 is a front view of the hot water storage tank unit as viewed from the inlet side, and FIG. 4 is a cross-sectional view of the hot water storage tank unit according to the embodiment as viewed from the upper plate side of the hot water storage tank (hereinafter referred to as appropriate cross-reference). ). 3 and 4 show a state before the foaming liquid 6a of the foam heat insulating material 6 is injected.
As shown in FIG. 3, in the lower part of the hot water storage tank 2, when the rear plate 3c of the outer box 3A is viewed through the inlets 8 and 8, the inner leg 4 (4A) is positioned at the center in the width direction. The other inner legs 4, 4 (4B, 4C) are positioned at substantially both ends in the width direction. Further, the water supply pipe 11 and the water intake pipe 12 pass through the vicinity of the bottom plate 3e 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), and upward along the inner legs 4 (4A). 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 gaps s1, s1 are also filled with the foam heat insulating material 6. By the way, if 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 tank unit 1A through the outer box 3A. However, since the leakage of heat can be suppressed by securing the gap s1 between the side plate 3b of the outer box 3A and the hot water storage tank 2, it is possible to suppress the efficiency of the water heater K from being lowered. Note that the gap s1 is set to a minimum distance such that heat leakage can be suppressed, so that the hot water storage tank unit 1A can be configured in a compact manner.

  One (left side in the figure) of the inlet 8A (8) is formed at a position away from all of the hot water storage tank 2, the inner leg 4B, the water inlet pipe 12 and the inner leg 4A, and the rear of the outer box 3A via the inlet 8A. It is formed at a position where the plate 3c (back) can be seen through. In other words, the inlet 8A is formed at a position that does not overlap 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 other (right side in the drawing) inlet 8B (8) is formed at a position away from 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 box is formed via the inlet 8B. It is formed at a position where the rear plate 3c (back) of 3A can be seen. In other words, the inlet 8B is formed at a position that does not overlap the inner leg 4C, the hot water storage tank 2, the water supply pipe 11, and the inner leg 4A in a plan view when viewed from the inlet 8B.

  In the upper part of the hot water storage tank 2, when the inside of the outer box 3 </ b> A is viewed from the side of the inlet 9, 9 for the foamed liquid 6 a of the foam heat insulating material 6, the hot water discharge pipe 13 and the hot water supply pipe 14 are It extends toward the front side (pipe cover 3s side) along the upper end plate 2b toward the outer peripheral side (see also FIG. 4 to be described later). In the case where the water heater K includes a bathtub (not shown), a reheating heat exchanger HE is installed in the hot water storage tank 2, and the bathtub return pipe 15 connected to the heat exchanger HE is connected to 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), like the hot water supply pipe 13 and the hot water supply pipe 14. In the following description, the heat exchanger HE and the bathtub return pipe 15 are not necessarily essential components. That is, it goes without saying that the embodiment of the present invention can also be applied to a hot water storage tank unit that does not include the heat exchanger HE and the bathtub return pipe 15.

  The inlets 9 and 9 (9A and 9B) are formed at positions removed 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 plate 3c of the outer box 3A is passed through the inlets 9A and 9B. It is formed in a position that can be seen through. In other words, the inlets 9A and 9B are formed at positions that do not overlap the hot water storage tank 2, the hot water pipe 13, the hot water supply pipe 14 and the bathtub return pipe 15 in a plan view when viewed from the inlets 9A and 9B.

The hot water supply pipe 14 at the upper part of the hot water storage tank 2 is disposed through a socket 20 in the vicinity of the top of the upper end plate 2b. In FIG. 3, the outlet 20 and the socket 20 of the bathtub return pipe 15 are omitted. 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 protruding from the hollow cylindrical portion in a protruding shape.
A 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 hollow bottomed substantially cylindrical shape and a shape in which the hollow diameter of the bottom portion is substantially equal to the outer diameter of the hollow cylindrical portion of the socket 20. And the notch 21 for inserting the hot-water supply pipe 14 is provided. The support member 40 is fixed to the upper plate 3d of the outer box 3A by a method such as welding or bolting. In other words, the support member 40 is a clamp that engages with the socket 20 for fixing the hot water supply pipe 14 to the hot water storage tank 2, and this clamp is on the side of the inner leg 4 that is one end side of the hot water storage tank 2 in the outer box 3 </ b> A. It is being fixed to the inner surface of the surface which opposes the other end side used as the other side.

  By the way, in the conventional hot water storage tank unit, when high hardness water such as well water is used as the water to be supplied to the hot water storage tank, if the copper alloy such as brass is used for the pipe, the inner surface of the pipe is corroded due to deterioration over time. It is known that stress corrosion cracking occurs (for example, Reference 1: “Tsutsutsu Otsu,“ Stress corrosion cracking of copper alloy ”, corrosion prevention technology, Vol. 12 (1963), No. 9, P412-423). Or https://www.jstage.jst.go.jp/article/jcorr1954/12/9/12_9_413/_pdf, Internet, August 1, 2014 search ”). Therefore, in order to cope with this problem, a product in which all piping is made of stainless steel has been devised (for example, see Patent Document 1).

However, if high hardness water such as well water is not used as water to be supplied to the hot water storage tank, there is no need to consider the problem of corrosion on the inner surface of the pipe. Many cases are used in
On the other hand, in the hot water storage tank unit 1A of the embodiment of the present invention, regardless of the type of water supplied to the hot water storage tank 2, all the piping accommodated in the outer box 3A has corrosion resistance to amines or ammonia. The piping which has is used. Specifically, all the pipes including at least the water supply pipe 11, the water inlet pipe 12, the hot water outlet pipe 13, the hot water supply pipe 14, and the bathtub return pipe 15 accommodated in the outer box 3A are composed of corrosion resistant pipes against amines or ammonia. ing. In addition, piping here is a concept including all these, regardless of forms, such as a pipe, a tube, and a hose.

ここで、化学式１は発泡断熱材６を形成する発泡ポリウレタンの加水分解の例を示す化学反応式、化学式２は発泡断熱材６を形成する発泡ポリウレタンの熱分解の例を示す化学反応式である。式中Ｒ，Ｒ´は例えばアルキル基を示す。なお、Ｒ，Ｒ´は同じであってもよく、互いに異なっていてもよい。貯湯タンク２や配管の周囲に付着する水分とは、例えば結露水が挙げられる。また、貯湯タンク２や配管の周囲の熱とは、例えば貯湯タンク２や配管の内部の湯の熱が直接的に、あるいは真空断熱材５が巻かれている場合はその隙間などを介して間接的に、熱伝達される場合が考えられる。
一般に、ポリウレタンの構造式中におけるカルボニル基は水（Ｈ_２Ｏ）の酸素（Ｏ）による求核反応を受けやすい。このため、ポリウレタン中のウレタン結合が周囲の水分と反応することにより、ポリウレタンはイソシアネート成分と、ポリオール成分とに分解される（加水分解）。また、ポリウレタン中のウレタン結合はＣ−Ｏ間において比較的結合が弱く、ポリウレタンは熱に曝されることによりイソシアネート成分と、ポリオール成分とに分解される（熱分解）。
さらに、ポリウレタンの分解により生成したイソシアネート成分のイソシアネート基と、水（Ｈ_２Ｏ）が反応することにより、イソシアネート成分は、アミノ基を有するアミン成分と二酸化炭素（ＣＯ_２）とに分解される（加水分解）。

化学式３に示すように、イソシアネート成分が加水分解されると、第一級アミンと、二酸化炭素が生成される。化学式中、アミン類のアルキル基（Ｒ）が水素原子（Ｈ）である場合は、当該アミン類はアンモニア（ＮＨ_３）となり、アンモニアが生成される。以上を換言すると、化学式１〜３に示すように、前記発泡断熱材６の分解によってアミン類またはアンモニアが生成される。
ところで、このようにして発生するアンモニアは、例えば黄銅などの銅合金の腐食媒としてかなり広く知られており、アンモニアは水に非常によく溶けるため、湿度により影響を受けることも知られている。つまり、アンモニアガス雰囲気中において、黄銅などの銅合金の応力腐食割れがかなり顕著に起こることが知られている（例えば、前出の参考文献１のｐ４１８「３・２ アンモニア」の節を参照）。
ゆえに、配管が従来のように黄銅などの銅合金素材で構成されている場合には、給水する水の硬度などの水質に係らず、発泡ポリウレタンよりなる発泡断熱材６の分解による劣化が進むとともに発生するアンモニアによって、配管の外部表面の腐食が進行してしまう。そして、さらに経年劣化が進むと、応力腐食割れを起こしてしまう場合がある。
この課題に対処するために、本発明の実施形態に係る貯湯タンクユニット１Ａの外箱３Ａの内部に収容される配管はすべて、アミン類またはアンモニアに対する耐食性を有する配管で構成されている。 The reason why the pipe is made of a material having corrosion resistance to amines or ammonia is as follows. As described above, in the hot water storage tank unit 1A according to the embodiment of the present invention, the foaming liquid 6a of the foam heat insulating material 6 is injected into the gap between the outer box 3A and the hot water storage tank 2. The hydroxyl group of the polyol contained in the foamed liquid 6a reacts with the isocyanate group of the isocyanate component to form polyurethane. When the polyurethane is formed, the foaming agent is foamed to form foamed polyurethane, and the foam heat insulating material 6 made of foamed polyurethane is filled between the outer box 3A and the hot water storage tank 2 without a gap. The foamed heat insulating material 6 made of foamed polyurethane deteriorates immediately after synthesis due to hydrolysis by water (for example, condensed water) adhering to the surroundings of the hot water storage tank 2 and piping, or by thermal decomposition due to ambient heat. Examples of hydrolysis reaction of polyurethane or examples of thermal decomposition of polyurethane are shown below.

Here, the chemical formula 1 is a chemical reaction formula showing an example of hydrolysis of the foamed polyurethane forming the foam heat insulating material 6, and the chemical formula 2 is a chemical reaction formula showing an example of thermal decomposition of the foamed polyurethane forming the foam heat insulating material 6. . In the formula, R and R ′ represent, for example, an alkyl group. Note that R and R ′ may be the same or different from each other. The water adhering around the hot water storage tank 2 and the pipe includes, for example, condensed water. The heat around the hot water storage tank 2 and the pipe is, for example, directly from the hot water inside the hot water storage tank 2 and the pipe, or indirectly through a gap when the vacuum heat insulating material 5 is wound. In some cases, heat is transferred.
In general, a carbonyl group in the structural formula of polyurethane is susceptible to nucleophilic reaction by oxygen (O) of water (H ₂ O). For this reason, when the urethane bond in the polyurethane reacts with surrounding moisture, the polyurethane is decomposed into an isocyanate component and a polyol component (hydrolysis). In addition, the urethane bond in polyurethane is relatively weak between C—O, and polyurethane is decomposed into an isocyanate component and a polyol component when exposed to heat (thermal decomposition).
Further, the isocyanate groups of the isocyanate component generated by the decomposition of the polyurethane, by water (H 2 _O) to react, the isocyanate component is decomposed into the amine component and carbon dioxide having an amino group (CO ₂₎ ( Hydrolysis).

As shown in Chemical Formula 3, when the isocyanate component is hydrolyzed, primary amine and carbon dioxide are generated. In the chemical formula, when the alkyl group (R) of the amine is a hydrogen atom (H), the amine is ammonia (NH ₃ ), and ammonia is generated. In other words, as shown in Chemical Formulas 1 to 3, amines or ammonia is generated by the decomposition of the foam heat insulating material 6.
By the way, the ammonia generated in this way is well known as a corrosion medium for copper alloys such as brass, and it is also known that ammonia is affected by humidity because it is very soluble in water. That is, it is known that stress corrosion cracking of a copper alloy such as brass occurs significantly in an ammonia gas atmosphere (for example, see the section of p418 “3.2 Ammonia” in Reference Document 1 above). .
Therefore, when the pipe is made of a copper alloy material such as brass as in the prior art, deterioration due to decomposition of the foam heat insulating material 6 made of foamed polyurethane progresses regardless of the water quality such as the hardness of water supplied. Corrosion of the external surface of the piping proceeds due to the generated ammonia. Further, when the aging deterioration further proceeds, stress corrosion cracking may occur.
In order to cope with this problem, all the piping accommodated in the outer box 3A of the hot water storage tank unit 1A according to the embodiment of the present invention is configured by piping having corrosion resistance against amines or ammonia.

  In addition, as a concrete candidate of such corrosion-resistant piping against amines or ammonia, for example, stainless steel piping or resin piping may be used. Moreover, piping of materials other than these may be used. Furthermore, for example, a member such as a pipe joint is a polymer (polymer) in which sulfur is bonded to a benzene ring, and when a PPS (polyphenylene sulfide) resin member excellent in heat resistance and pressure strength performance is used in combination, corrosion resistance is improved. In addition, it can be said that the amount of deformation is also suppressed, which is more preferable. In addition, for example, when the corrosion-resistant piping is made of stainless steel, benefits such as resistance to dirt on the outer surface, moisture on the inner surface, and resistance to rusting can be enjoyed as benefits other than corrosion resistance. Is preferred.

  In this state, as shown in FIG. 4, the inlets 9A and 9B are directed upward in the vertical direction, and the foaming liquid 6a of the foam heat insulating material 6 is injected downward in the vertical direction 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 box 3 is on the lower (bottom) side in the vertical direction.

  By the way, when the foaming liquid 6a of the foam heat insulating material 6 before foaming is injected from the injection ports 9A and 9B, the hot water discharge pipe 13 in the middle of the foam liquid 6a of the foam heat insulating material 6 reaching the rear plate 3c of the outer box 3A, When contact is made with other members such as the hot water supply pipe 14, the bathtub return pipe 15, the socket 20, and the support member 40, foaming occurs in other members such as 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. Will be started, and there is a possibility that the foamed heat insulating material 6 will not spread to the back side of other members. So, in embodiment, when the foaming liquid 6a of the foam heat insulating material 6 before foaming is inject | poured perpendicularly downward from injection port 9A, 9B, the foaming liquid 6a of the foam heat insulating material 6 is the hot water storage tank 2, the hot water pipe. 13, without reaching the hot water supply pipe 14, the bathtub return pipe 15, the socket 20, and the support member 40, the inner wall surface 3 c 1 of the rear plate 3 c of the outer box 3 A is reached. Thereby, the foam heat insulating material 6 can be made to foam upward from the bottom side, and the foam heat insulating material 6 can be spread over the whole gap between the hot water storage tank 2 and the outer box 3A.

  Even when the foamed liquid 6a of the foam heat insulating material 6 is injected from the inlets 8A and 8B, the foamed liquid 6a of the foamed heat insulating material 6 injected from the inlets 8A and 8B becomes the hot water storage tank 2 and the inner legs 4A and 4B. , 4C, without reaching the water supply pipe 11 and the water inlet pipe 12, the inner wall surface 3c1 of the rear plate 3c of the outer box 3A is reached. Thereby, the foam heat insulating material 6 can be made to foam upward from the bottom side, and the foam heat insulating material 6 can be spread over the whole gap between the hot water storage tank 2 and the outer box 3A.

  Further, a gap s2 is formed between the rear plate 3c of the outer box 3A and the hot water storage tank 2. The gap s2 is also filled with the foam heat insulating material 6. A gap s3 is also formed between the front plate 3a of the outer box 3A and the hot water storage tank 2. Thus, by ensuring the clearances s2 and s3, heat leakage can be suppressed, so that the efficiency as the water heater K can be prevented from decreasing. Note that the gaps s2 and s3 are set to a minimum distance such that heat leakage can be suppressed, so that the hot water storage tank unit 1A can be made compact.

FIG. 5A is a view showing the flow of the foam insulation (foaming liquid) at the time of injection, FIG. 5B is a view showing the state of the foam insulation (foaming liquid) after the completion of injection, and FIG. ) Is a diagram showing a state during foaming. In addition, description of the hot water pipe 13 and the bathtub return pipe 15 is abbreviate | omitted.
As shown to Fig.5 (a), before attaching piping cover 3s (refer FIG. 1), what fixed the hot water storage tank 2 in the outer case 3A with the inner legs 4A, 4B, 4C, and the support member 40, The outer box 3A is laid sideways so that the upper and lower sides when the outer box 3A is used are in the horizontal direction and the front plate 3a is facing upward, and the inlets 8 and 9 are facing upward. Thus, in the state where the outer box 3A is laid down, the periphery of the outer box 3A is prevented from being deformed by the pressing force when the foaming liquid 6a of the foam heat insulating material 6 is foamed. (Also referred to as “)” (see the two-dot chain line in FIG. 5). 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, a nozzle 31 formed in advance at a position corresponding to the injection ports 8 and 9 is inserted into the injection ports 8 and 9 from the outside of the foam management jig 30, and the foaming liquid of the foam insulation material 6 is injected from the injection ports 8 and 9. Inject 6a.

  Thereby, the foaming liquid 6a of the foaming heat insulating material 6 injected from the injection ports 9A and 8B is obstructed 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. Without reaching the inner wall surface 3c1 on the bottom side (rear plate 3c). And the foaming liquid 6a of the foam heat insulating material 6 spreads along the inner wall surface 3c1 of the back plate 3c, and spreads to a surface of the inner wall surface 3c1 at a predetermined depth as shown in FIG. In addition, the depth which inject | pours the foaming liquid 6a of the foam heat insulating material 6 can be suitably changed according to the foaming magnification of the foam heat insulating material 6. FIG.

Thereafter, the foam heat insulating material 6 starts to foam, and, as shown in FIG. 5C, from the rear plate 3c side (lower side in the drawing, bottom side) of the outer box 3A toward the front plate 3a side (upper side in the drawing). Gradually foam. The foam heat insulating material 6 expands to the inner wall surface 3a1 of the front plate 3a, and the entire gap between the outer box 3A and the hot water storage tank 2 is filled with the foam heat insulating material 6.
At this time, the lower side of the hot water storage tank 2 (the left side of FIG. 5A) is foamed pressure Pa (FIG. 5B) by the inner legs 4A, 4B, 4C fixed to the outer box 3A. ), Even if it is received (see the white arrow in FIG. 5C), misalignment such as lifting is prevented. In addition, the upper side of the hot water storage tank 2 (the right side of FIG. 5A) is also supported by the support member 40 fixed to the outer box 3A, and the foaming pressure Pa of the foam heat insulating material 6 (FIGS. 5B and 5C). ) (See the white arrow)), it is possible to prevent misalignment such as lifting.
In addition, 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 being expanded (deformed) by the foaming pressure Pa when the foam heat insulating material 6 is foamed. it can. The foam heat insulating material 6 is cured after the foaming is completed.

FIG. 6 is a cross-sectional view of the hot water storage tank unit.
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 box 3A.

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

  Further, on both side portions of the hot water storage tank unit 1A, gaps s1 and s1 are formed between the outer box 3A and the vacuum heat insulating material 5 closest to the outer box 3A, and each gap s1 is filled with the foam heat insulating material 6. It has come to be. Similarly, in the rear part of the hot water storage tank unit 1A, a gap s2 is formed between the outer box 3A and the vacuum heat insulating material 5 closest to the outer box 3A, and the gap s2 is filled with the foam heat insulating material 6. Yes.

  In this way, the gap s3 is formed between the hot water storage tank 2 and the outer box 3A, and the gaps s1, s1, and s2 are formed between the vacuum heat insulating material 5 and the outer box 3A, and the foam heat insulating material 6 is installed here. Thus, it is possible to suppress the heat in the hot water storage tank 2 from leaking to the outside of the outer box 3A through the vacuum heat insulating material 5.

FIG. 7A shows a state of coating of the vacuum heat insulating material before injection of the foam heat insulating material (foaming liquid), and FIG. 7B shows a state of covering of the vacuum heat insulating material after injection of the foam heat insulating material (foaming liquid) and foaming. It is.
By the way, although the vacuum heat insulating material 5 is excellent in heat insulation performance compared with the foam heat insulating material 6 etc., it is compressed and hardened | cured by vacuum drawing etc. 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 the embodiment, by using the vacuum heat insulating material 5 and the foam heat insulating material 6 together, the vacuum heat insulating material 5 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. be able to. In the embodiment, the gaps s1, s2, and s3 that cannot be filled with the vacuum heat insulating material 5 are formed by using the foamed liquid 6a of the foam heat insulating material 6 to be foamed after injection instead of the molded foam heat insulating material. A gap around the end plate 2b and the lower end plate 2c 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. 7A, when the vacuum heat insulating material 5 is wound around the outer surface of the hot water storage tank 2 before the foaming liquid 6a of the foam heat insulating material 6 is filled, the outer surface of the hot water storage tank 2 and the vacuum heat insulating material 5 A gap S is formed between the two. However, as shown in FIG. 7B, the foaming pressure Pa when the foaming heat insulating material 6 is foamed by injecting the foaming liquid 6 a of the foaming heat insulating material 6 between the outer box 3 </ b> A and the vacuum heat insulating material 5. Acts in a direction in which the vacuum heat insulating material 5 is pressed against the hot water storage tank 2, so that the vacuum heat insulating material 5 comes into close contact with the outer surface of the hot water storage tank 2.

  Thus, since the vacuum heat insulating material 5 can be closely_contact | adhered to the hot water storage tank 2, in the hot water storage tank unit 1A, it becomes possible to improve heat insulation performance. This makes it possible to obtain a hot water storage tank unit 1A having high energy saving performance.

(Action / Effect)
The actions and effects of the embodiment of the present invention are summarized as follows.
In the hot water storage tank unit 1A of the embodiment, when the inlets 9A and 9B look inside the outer box 3A from the inlet 9 (9A and 9B), the hot water storage tank 2 and the pipes (the hot water pipe 13, the hot water pipe 14, The bathtub return pipe 15), the socket 20, and the support member 40 are arranged at a position where the back (the rear plate 3 c) of the outer box 3 </ b> A can be seen without being obstructed. According to this, the inlets 9A, 9
When the foaming liquid 6a of the foam heat insulating material 6 is injected from B, the foaming liquid 6a of the foam heat insulating material 6 can be directly supplied to the inner wall surface 3c1 of the rear plate 3c from the inlets 9A, 9B. Above 2, the foam insulation 6 can be filled in the entire gap between the outer box 3 </ b> A and the hot water storage tank 2. Therefore, the hot water storage tank unit 1A having high heat insulation performance can be obtained.

  In addition, in the hot water storage tank unit 1A of the embodiment, when the inlets 8A and 8B look inside the outer box 3A from the inlet 8 (8A and 8B), the hot water storage tank 2 and piping (water supply pipe 11, water inlet pipe) 12) and the inner leg 4 (4A, 4B, 4C) are arranged at a position where the back (the rear plate 3c) of the outer box 3A can be seen without being obstructed. According to this, when the foaming liquid 6a of the foam heat insulating material 6 is injected from the injection ports 8A and 8B, the foaming liquid 6a of the foam heat insulating material 6 is directly applied from the injection ports 8A and 8B to the inner wall surface 3c1 of the rear plate 3c. Since it can be supplied, the foamed heat insulating material 6 can be filled in the entire gap between the outer box 3 </ b> A and the hot water storage tank 2 below the hot water storage tank 2. Therefore, the hot water storage tank unit 1A having high heat insulation performance can be obtained.

  In general, the hot water storage tank 2 is easily displaced due to the buoyancy caused by the foaming pressure Pa because it is empty when the foam 6a of the foam insulation 6 is poured into the outer box 3A. However, in the hot water storage tank 2 of the embodiment, the lower side (the left side in FIG. 5A) has the inner legs 4A, 4B, 4C fixed to the outer case 3A via the leg receiving portion 4a and the upper side (FIG. 5 (a) also has a structure in which the support member 40 is fixed to the outer box 3A via the socket 20. As a result, the movement of the hot water storage tank 2 is restricted even when subjected to the foaming pressure Pa of the foam heat insulating material 6 (see the white arrows in FIGS. 5 (b) and 5 (c)). Thus, it is possible to reliably prevent misalignment phenomenon.

  Further, according to the 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 improved, and the vacuum heat insulating material can be increased by the foaming pressure Pa of the foam heat insulating material 6. 5 can be brought into close contact with the outer peripheral surface of the hot water storage tank 2, so that a hot water storage tank unit 1A having higher heat insulation performance can be obtained.

  Further, according to the 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, The inlets 8 and 8 are formed at positions where the rear plate 3c can be seen without being obstructed by the hot water storage tank 2, piping (water supply pipe 11, water inlet pipe 12) and inner legs 4 (4A, 4B, 4C). Can do.

  Moreover, according to the embodiment, all the pipes accommodated in the outer box 3A are made of corrosion-resistant pipes against amines or ammonia. Specifically, any pipe including at least the water supply pipe 11, the water inlet pipe 12, the hot water pipe 13, the hot water pipe 14, and the bathtub return pipe 15 accommodated in the outer box 3A is an anticorrosive pipe for amines, amines, or ammonia. It consists of Thereby, the foam heat insulating material 6 causes a chemical reaction due to moisture or heat. For example, even if the urethane bond is decomposed to generate ammonia gas, the ammonia gas becomes a corrosion medium and causes stress corrosion cracking. There is nothing. Thereby, since airtightness increases, water leakage due to stress corrosion cracking does not occur. That is, a hot water storage tank unit 1A having high hot water storage performance can be realized.

  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, in the embodiment, the injection ports 8 and 8 are arranged on the pipe cover 3s side (front plate 3a side), so that the injection of the foaming liquid 6a of the foam heat insulating material 6 and foaming are completed, and then the injection ports 8 and 8 are completed. Is covered by the piping cover 3s (see FIG. 1). Accordingly, the inlets 8 and 8 that serve as water (rainwater) inlets are covered with the piping cover 3s, and the inlets 8 and 8 are covered with water (for example, the inlets 8 and 8 are covered with lids). Even without taking measures to fill the gap between the lids with a sealing member, it is possible to prevent water from entering through the inlets 8 and 8 by simply closing the inlets 8 and 8 with a simple lid. Therefore, the configuration of the hot water storage tank unit 1A can be simplified.

The above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to the one having all the described configurations. In addition, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and a part or all of the configuration of another embodiment can be added to the configuration of one embodiment. It is. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  For example, in the embodiment, the configuration in which the vacuum heat insulating material 5 is wound so as to be in contact with the outer peripheral surface of the hot water storage tank 2 has been described as an example, but the present invention is not limited to this, and the inner wall surface ( The structure which arrange | positions the vacuum heat insulating material 5 on each inner wall of the front board 3a, the side board 3b, the rear board 3c, the upper board 3d, and the bottom board 3e may be sufficient. Thereby, not only the side surface (circumferential surface side) of the hot water storage tank 2 but also the entire periphery of the hot water storage tank 2 including the upper side and the lower side of the hot water storage tank 2 can be covered.

  Further, as a modification of the embodiment, the outer box 3A may be formed in a regular octagonal shape when viewed in cross section. Even in this case, since the distance between the hot water storage tank 2 and the outer box is substantially the same in the circumferential direction, the filling amount of the foam heat insulating material 6 filled around the hot water storage tank 2 is substantially the same in the front, rear, left and right. Thereby, the foaming pressure Pa of the foam heat insulating material 6 acting on the hot water storage tank 2 can be made uniform, and it is possible to prevent the occurrence of problems such as deformation of the hot water storage tank 2.

  Further, in the embodiment, the support member 40 is configured to be engaged with the socket 20 of the hot water supply pipe 14, but is not limited thereto. The support member 40 does not ask | require the kind of installation piping. For example, it is good also as a structure engaged with the socket 20 of the hot-water pipe 13 and the bathtub return pipe 15, respectively.

In addition, the present invention is a direct water pressure hot water supply apparatus for supplying hot water to hot water supply terminals 18 such as a faucet or shower by exchanging heat between hot water taken out from the upper part of the hot water storage tank 2 and tap water, and hot water. It can be applied regardless of the type of hot water supply device.
Further, the additional cooking heat exchanger HE can be applied to a hot water supply apparatus provided outside the hot water storage tank.

1A Hot water storage tank unit 2 Hot water storage tank 2a Body plate 2b Upper end plate 2c Lower end plate 3A Outer box 3a Front plate (upper surface in the vertical direction of the outer box)
3b Side plate 3c Rear plate (Vertical bottom surface of outer box)
3c1 inner wall surface 3d upper plate (surface facing the other end of the hot water storage tank)
3e Bottom plate (surface facing one end of hot water storage tank)
4, 4A, 4B, 4C Inner leg 4a Leg receiving part 8, 9 Inlet 3s Piping cover 5 Vacuum heat insulating material 5a, 5b Non-overlapping part 6 Foam heat insulating material 6a Foam liquid (foam heat insulating material)
8, 8A, 8B, 9, 9A, 9B Inlet 10 Heat pump unit 11 Water supply pipe (pipe)
12 Inlet pipe (piping)
13 Hot water pipe (piping)
14 Hot water supply pipe (pipe)
15 Bathtub return pipe (pipe)
16 Mixing valve 17 Hot water supply pipe 18 Hot water supply terminal 20 Socket 21 Notch 31 Nozzle 32 Hole 40 Support member S, s1, s2, s3 Clearance T1, T2 Temperature sensor BT Bolt HE Heat exchanger G Installation place K Hot water supply machine Pa Foaming pressure g Vertical downward

The present invention includes a hot water storage tank, wherein an outer box that houses the hot water storage tank, a foamed polyurethane foaming liquid is injected as a foamed formed by foam insulation between the hot water storage tank and the outer box, wherein wherein by foaming the foaming liquid e Bei a pipe having a corrosion resistance to amines or ammonia that generates housed inside the outer box and by decomposition of the polyurethane foam, and at least partly around the said pipe Filled with foamed polyurethane .

The present invention includes a hot water storage tank, an outer box that accommodates the hot water storage tank, a foaming liquid inlet that is provided in the outer box and communicates with the inside of the outer box, a pipe that is accommodated inside the outer box, comprising a foamed polyurethane as foamed heat insulation material is a filling between the outer box and the hot water storage tank, wherein the pipe, at least part of the periphery is covered before Symbol foamed polyurethane, degradation of the polyurethane foam It is characterized by having corrosion resistance to amines or ammonia generated by

Claims (4)

A hot water storage tank,
An outer box containing the hot water storage tank;
A foam heat insulating material formed by injecting a foaming liquid between the outer box and the hot water storage tank;
A pipe that is housed inside the outer box and has corrosion resistance to amines or ammonia generated by the decomposition of the foam insulation; and
A hot water storage tank unit comprising:   The piping includes at least a water supply pipe through which tap water is introduced into the hot water storage tank, a water inlet pipe from the hot water storage tank to a heat pump, a hot water discharge pipe from the heat pump to the hot water storage tank, and a hot water supply pipe from the hot water storage tank to the hot water supply terminal. The hot water storage tank unit according to claim 1, comprising:   The hot water storage tank unit according to claim 1, wherein the pipe is made of stainless steel or resin.   The hot water storage tank unit according to claim 1, wherein the foam heat insulating material is a rigid polyurethane foam.

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