JP2017048956A - Hot water storage tank unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new hot water storage tank unit reducing the generating place of seamed parts on the basis of foaming of a foam insulating material, and high in distribution uniformity of foams of a foam insulating material.SOLUTION: Two injection ports 8 and 9 of a foam insulating material are installed in vertically symmetrical positions, horizontally symmetrical positions, or the diagonally same positions, to a center line of one surface 3a of an external case 3A storing a hot water storage tank 2, and the liquid foam insulating material is injected from the two injection ports 8 and 9. With this, the number of seamed parts on the basis of foaming of the foam insulating material is reduced, and distribution uniformity of foams of the foam insulating material becomes high so as to suppress heat conductivity from worsening.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hot water storage tank unit used in an electric hot water hot water supply system, a heat pump hot water supply system, and the like.

  The hot water storage tank unit used in the electric hot water hot water supply system and the heat pump hot water supply system needs to cover the hot water storage tank with a heat insulating material in order to maintain the temperature of the hot water stored in the hot water storage tank.

  Conventionally, a surface heat insulating material such as glass wool is wound around the hot water storage tank itself. In the case where heat insulation is wrapped around a hot water storage tank, a dedicated equipment machine is required, or in a large hot water storage tank, it is impossible for one worker to work efficiently to wrap the heat insulation material, and man-hours during manufacturing and assembly are reduced. There was a problem of high cost.

  In view of this, it has been practiced to form or cut foam polystyrene having high heat insulation into a required shape and place and fix it around the outer periphery of the hot water storage tank. According to this, just by attaching the plurality of molded heat insulating materials so that they fit into appropriate positions at the time of manufacturing and assembly, the molded heat insulating material adheres to the outside of the hot water storage tank, improving the heat insulation and heat insulating properties of the hot water storage tank, and manufacturing. Assembling man-hours are not required, efficient work can be performed, and costs can be kept low.

  However, in the case of using a foamed polystyrene molded heat insulating material, there is a phenomenon in which heat leakage occurs from the gap between the joints of the molded heat insulating material and the molded heat insulating material. In addition, when the vacuum heat insulating material is pressed against the outer peripheral wall of the hot water storage tank or the inner wall of the outer case (outer box) with a molded heat insulating material, there is a space between the vacuum insulating material with low flexibility and the molded heat insulating material with low flexibility. There is a phenomenon that occurs and reduces the heat insulation performance.

  Therefore, recently, as disclosed in Japanese Patent Application Laid-Open No. 2015-34654 (Patent Document 1), liquid urethane is injected between the hot water storage tank and the outer case, and the flow and foaming of the liquid urethane is used to Filling urethane foam insulation between exterior cases is becoming more common. According to this, since there is no joint part of a shaping | molding heat insulating material, a heat leak can be decreased, and since a clearance gap does not arise between vacuum heat insulating materials, there exists an effect which can suppress the fall of heat insulation performance.

JP 2015-34654 A

  By the way, the liquid urethane injection method as described in Patent Document 1 is generally placed so that the front plate of the outer case of the hot water storage tank unit faces upward, and is placed at the four corners of the front plate of the outer case. Liquid urethane is injected through four arranged injection ports. At this time, at least four streaks are generated at the “joint” (the portion where the liquid urethane injected into different positions foams and the foaming progress surfaces meet each other) based on the foaming of the liquid urethane.

  For this reason, the liquid urethane injected from different injection ports starts to foam and grow, and an unfilled urethane portion (hereinafter referred to as a void) tends to occur at the “joint” where the foamed urethane joins. In addition, the foaming progress surfaces interfere with each other to lower the fluidity and locally increase the density of the urethane, thereby impairing the uniform distribution of bubbles and deteriorating the thermal conductivity. Accordingly, there is a need for a hot water storage tank unit that can reduce the occurrence of the “joint” as described above, and further can disperse and form the bubbles included in the foam heat insulating material such as urethane as uniformly as possible.

  An object of the present invention is to provide a novel hot water storage tank unit that reduces the number of occurrences of “joints” based on foaming of a foamed heat insulating material and has high distribution uniformity of bubbles in the foamed heat insulating material.

  The feature of the present invention is that the two foam insulation materials are located vertically symmetrically, horizontally symmetrically, or diagonally at the same position with respect to the center line of one surface of the outer box containing the hot water storage tank. There is a place where a liquid foam heat insulating material is injected from these two inlets.

  According to the present invention, the number of “joints” based on foaming of the foamed heat insulating material is reduced, and further, the distribution uniformity of the bubbles of the foamed heat insulating material is increased, so that deterioration of thermal conductivity can be suppressed. become.

It is a whole lineblock diagram showing the heat pump type hot-water supply device to which the present invention is applied. It is a perspective view which shows the inside of the hot water storage tank unit shown in FIG. It is the top view which looked at the hot water storage tank unit shown in FIG. 1 from the urethane inlet side. It is sectional drawing which looked at the hot water storage tank unit shown in FIG. 1 from the bottom side of the hot water storage tank. It is explanatory drawing explaining the flow of the liquid urethane at the time of urethane injection | pouring. It is explanatory drawing explaining the foaming state of liquid urethane at the time of urethane injection | pouring. It is a cross section of the hot water storage tank unit shown in FIG. 1, and is a cross-sectional view after foaming. It is explanatory drawing for demonstrating the 2nd Embodiment of this invention. It is explanatory drawing for demonstrating the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments, and various modifications and application examples are included in the technical concept of the present invention. Is also included in the range.

  First, the structure of a heat pump type hot water supply apparatus provided with a hot water storage tank unit 1A to which the present invention is applied will be described with reference to FIGS.

  As shown in FIG. 1, the heat pump type hot water supply apparatus 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, inner legs (leg portions) 4A, 4B, 4C, 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 hot water storage tank 2 includes a body plate 2a, an upper end plate 2b, and a lower end plate 2c.

  The temperature of the hot water in the hot water storage tank 2 becomes higher as it goes from the lower side to the upper side in the vertical direction, for example. 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 present embodiment, the heat pump unit 10 is described as an example of the heating unit. However, the heating unit may be an electric heater or a gas heater.

  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 present embodiment, the case where the hot water in the hot water storage tank 2 is used for the hot water supply terminal 18 has been described as an example. However, the water supplied without using the hot water in the hot water storage tank 2 as hot water for the hot water supply terminal is used. 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 heat exchange (heating).

  The outer box 3A constituting the exterior case has a space for housing 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 bathtub return 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. Further, the outer box 3A includes a front plate 3a, a side plate 3b, a rear plate 3c, a top plate 3d, and a bottom plate 3e.

  FIG. 2 is a perspective view showing the interior of the hot water storage tank unit 1A according to the first embodiment. 2 shows a state in which the front 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 material such as stainless steel, a cylindrical body plate 2a, a substantially hemispherical upper end plate 2b covering the upper opening of the body plate 2a, and a lower opening of the body plate 2a. It is comprised by welding three members of the substantially hemispherical lower end plate 2c which covers.

  The hot water storage tank 2 is supported on the bottom plate 3e of the outer box 3A via three inner legs 4A, 4B, 4C. The lower ends of the inner legs 4A, 4B, 4C are fixed to the bottom plate 3e of the outer box 3A with bolts or the like. The number of the inner legs 4 is not limited to three, and may be four or more.

  In addition, 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 present embodiment, and is not limited to the upper part of the hot water storage tank 2, but is configured to have three or more temperature sensors 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 includes a front plate 3a (see FIG. 1) positioned in front of the hot water storage tank 2, side plates 3b and 3b positioned laterally, and a rear positioned rearward. A plate (back plate) 3c (see FIG. 1), an upper plate (top plate) 3d located above, and a bottom plate 3e located below (bottom side) constitute a vertically long rectangular box.

  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.

  In addition, one inlet 8 for injecting the foam heat insulating material 6 communicates with the inside of the outer box 3A on one left side end surface of the lower portion of the front plate 3a constituting one surface of the outer box 3A. In this way, it is formed so as to penetrate the front plate 3a. Also, the front plate 3a is attached to one right side end surface of the upper portion of the front plate 3a of the outer box 3A so that one injection port 9 for injecting the foam heat insulating material 6 communicates with the inside of the outer box 3A. It is formed through.

  As shown in FIG. 3, the injection port 8 and the injection port 9 are located diagonally with respect to the center line C1 along the longitudinal direction of the front plate 3a, and are formed at the same position. The inlets 8 and 9 are holes necessary for injecting the foam heat insulating material 6, and the foaming operation is performed in a state where the surface on which the inlet of the outer box 3 </ b> A of the hot water storage tank unit is installed faces upward. Done. The injection ports 8 and 9 are closed by an inner lid (cover) (not shown) after the foaming heat insulating material is injected and foamed.

  Here, the present embodiment is characterized in that two injection ports 8 and 9 are disposed at the same diagonal position with respect to the center line C1 along the longitudinal direction of the front plate 3a. doing. In addition, two injection ports 8 and 9 of the foam insulation material are arranged at the same position diagonally with respect to the center line C1, and the foam insulation material to be further injected touches the vacuum insulation material 5 and various pipes. If there is no positional relationship in which the liquid is fed to the rear plate 3c, there is no problem even if the injection ports 8 and 9 are provided at arbitrary positions on the surface of the front plate 3a.

  The foam heat insulating material 6 is not a pre-formed heat insulating material (molded heat insulating material) such as polystyrene foam, but injects a liquid heat insulating material into the foam heat insulating space between the hot water storage tank 2 and the outer box 3A, and itself after the injection The heat insulating material is configured by foaming. 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 blowing agent include cyclopentane, water, and carbon dioxide gas.

  In the present embodiment, the foam heat insulating material 6 is not limited to rigid polyurethane foam, but generally rigid polyurethane foam is mainly used. Therefore, in the following, it may be expressed as foam insulation or urethane.

  The inner legs 4A to 4C are bent in an L shape (so-called L-shaped angles) and extend 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 formed in an L shape 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 4A-4C is arrange | positioned around the hot water storage tank 2 at intervals of 120 degree | times, and one inner leg 4A is arrange | positioned at the front-end part (part located most forward) of the hot water storage tank 2, and others The inner legs 4 </ b> B and 4 </ b> C 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 3e at positions corresponding to the inner legs 4A to 4C. The outer leg 7 is fixed to an installation place such as concrete 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 the circumferential length thereof is shorter than the entire circumference of the hot water storage tank 2, and the temperature sensors T 1 and T 2 are positioned in the non-overlapping portion 5 a 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 T1 and T2 when a malfunction occurs in the temperature sensors T1 and T2. Furthermore, the vacuum heat insulating material 5 is also stuck inside the outer box 3A.

  FIG. 3 is a plan 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 first embodiment as viewed from the bottom side of the hot water storage tank. 3 and 4 show a state before the foam heat insulating material 6 (see FIG. 1) 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 inlet 8 side, the inner leg 4A is located at the center in the width direction, and the other inner legs 4B and 4C are located at substantially both ends in the width direction. Further, the water supply pipe 11 and the water intake pipe 12 are disposed so as to 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 drawing) and upward along the inner legs 4A. Has been.

  Further, gaps s 1 and s 1 are formed between the side plate 3 b of the outer box 3 A and the hot water storage tank 2. The gaps s1 and 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 1 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.

  In the hot water storage tank unit 1A having the above-described configuration, the conventional hot water storage tank unit 1A is, as described above, via the four inlets arranged at the four corners of the front plate of the outer box 3A constituting the exterior case. Liquid urethane is injected. At this time, at least four “joint” positions based on foaming of the liquid urethane are generated. For this reason, the liquid urethane earned from the different inlets starts to foam and grow, and the “unsealed portion” where the foamed urethane joins is liable to generate an unfilled urethane portion. In addition, the foaming progress surfaces interfere with each other to lower the fluidity and locally increase the density of the urethane, thereby impairing the uniform distribution of bubbles and deteriorating the thermal conductivity.

  Therefore, in the present embodiment, two points of the foam insulation material are poured at the same position diagonally with respect to the center line C1 of one surface (here, the front plate) of the outer box 3A housing the hot water storage tank 2. An inlet was installed, and a liquid foam heat insulating material was injected from these two injection ports. As a result, the number of “joints” based on foaming of the foam heat insulating material is reduced, and further, the distribution uniformity of the bubbles in the foam heat insulating material is increased, so that deterioration of the thermal conductivity can be suppressed.

  The inlets 8 and 9 according to the present embodiment are two inlets for injecting the foam heat insulating material 6 between the outer box 3A and the hot water storage tank 2, and the front plate 3a for installing the inlet of the outer box 3A. Is placed so as to face upward, and the foam insulation material is injected and foamed. The two inlets are provided at positions that do not interfere with the outer periphery of the hot water storage tank and the vacuum heat insulating material 5 attached to the inner side of the outer box 3A when the foam heat insulating material is injected. Furthermore, it is provided at the same position diagonally with respect to the center line C1 in the longitudinal direction of the front plate 3a. In addition, the left-right symmetric position and the up-down symmetric position which are other embodiments are mentioned later.

  The hot water discharge pipe 13 and the hot water supply pipe 14 extend from the center side of the hot water storage tank 2 toward the outer peripheral side (front side in the vertical direction in the drawing) along the upper end plate 2b toward the front side (pipe cover 3s side). . Further, in the case where the hot water supply device K is connected to the bathtub, a reheating heat exchanger is installed in the hot water storage tank 2, and the bathtub return pipe 15 connected to the heat exchanger is provided above the hot water storage tank 2. It is connected. 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.

  The inlet 8 located on the lower left side in FIG. 3 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 plate of the outer box 3A through the inlet 8 It is formed at a position where 3c (back) can be seen through. In other words, the inlet 8 is formed at a position that does not 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 8.

  In the upper part of the hot water storage tank 2, when the inside of the outer box 3A is viewed from the inlet 9 on the right side of the figure, the hot water discharge pipe 13 and the hot water supply pipe 14 are arranged from the center side of the hot water storage tank 2 to the outer peripheral side (front side in the vertical direction in the figure) ) Toward the front side (the piping cover 3s side) along the upper end plate 2b.

  The injection port 9 located on the upper right side of FIG. 3 is formed at a position away from the hot water storage tank 2, the hot water discharge pipe 13, the hot water supply pipe 14 and the bathtub return pipe 15, and looks through the rear plate 3 c of the outer box 3 </ b> A through the injection hole 9. It is formed at a position where it can. In other words, the inlet 9 is formed at a position that does not 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 a plan view when viewed from the inlet 9.

  As shown in FIG. 4, the liquid foam heat insulating material 6 is injected downward from the injection port 8 with the injection port 8 facing upward in the vertical direction. That is, the inlet 8 is on the upper side in the vertical direction, and the rear plate 3c of the outer box 3 is on the bottom side. By this injection method, the foam heat insulating material 6 can be foamed upward from the bottom side, and the foam heat insulating material 6 can be spread over the entire gap between the hot water storage tank 2 and the outer box 3A. The same applies to the inlet 9.

  By the way, when foaming heat insulating material 6 (liquid material) before foaming is injected from the injection port 8, the foamed heat insulating material 6 is in the middle of reaching the rear plate 3c of the outer box 3A, and other inner legs 4A to 4C and the like. When contacting the member, foaming is started in other members such as the inner legs 4A to 4C4, and there is a possibility that the foam heat insulating material 6 does not spread to the rear side of the other member. Therefore, in the present embodiment, when the foam heat insulating material 6 (liquid) before foaming is injected downward in the vertical direction from the injection port 8, the foam heat insulating material 6 is the hot water storage tank 2, the inner legs 4A to 4C, and the water supply pipe. The inner wall surface 3c1 of the rear plate 3c of the outer box 3A is reached without contacting the 11 and the water intake pipe 12. 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 foam heat insulating material 6 is injected from the injection port 9, the foam heat insulating material 6 injected from the injection port 9 does not contact the hot water storage tank 2, the hot water discharge pipe 13, the hot water supply pipe 14, and the bathtub return pipe 15. It reaches the inner wall surface 3c1 of the rear plate 3c of the outer box 3A. 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. Further, 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 of the hot water supply device can be suppressed from decreasing. The hot water storage tank unit 1A can be configured compactly by setting the gaps s2 and s3 to a minimum distance that can suppress heat leakage.

  Next, description will be made on the case where the foamed thermal insulation material is injected and foamed. FIG. 5A is a diagram showing the flow of the foamed thermal insulation material at the time of injection, and FIG. FIG.

  As shown in FIG. 5A, before attaching the piping cover 3s (see FIG. 1), the hot water storage tank 2 fixed in the outer box 3A with the inner legs 4A, 4B, 4C is laid down on the outer box 3A, When the outer box 3A is normally used, the upper and lower sides are in the horizontal direction, and the front plate 3a faces upward, and the inlets 8 and 9 are in the upward direction.

  In a state where the outer box 3A is placed sideways, the periphery of the outer box 3A is covered with a foam management jig (also referred to as hiring) 30 (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, from the outside of the foam management jig 30, 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, and liquid foam is generated from two points of the injection ports 8 and 9. Insulating material 6 is injected.

  As a result, the liquid foam heat insulating material 6 injected from the injection port 8 is not obstructed by the hot water storage tank 2, the inner legs 4A, 4B, 4C, the water supply pipe 11, and the water inlet pipe 12, but on the bottom side (rear plate 3c ) To the inner wall surface 3c1. Similarly, the liquid foam heat insulating material 6 injected from the injection port 9 reaches the inner wall surface 3c1 on the bottom side (rear plate 3c) without being obstructed by the hot water storage tank 2 and various pipes. And the foam heat insulating material 6 spreads along the inner wall surface 3c1 of the rear plate 3c, and spreads at a predetermined depth on one surface of the inner wall surface 3c1. In addition, the depth which inject | pours 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 gradually foams from the rear plate 3c side (lower side in the figure) to the front plate 3a side (upper side in the figure) as shown in FIG. 5B. 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. Here, the “joint” of the foam heat insulating material 6 is formed by a single line, and the gas discharge hole for discharging the foamed gas on this line is at least in the outer box 3A at a position facing the “joint”. One place is provided.

  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.

  Here, the place where the foam heat insulating material 6 finishes flowing finally concentrates in one place, and becomes the front plate 3a side (the upper side in the drawing). This is because the foam heat insulating material 6 is a foam that grows from the bottom to the top.

  Furthermore, since the injection ports 8 and 9 are two points, the “joint” of the foam insulation material generated in the flow process of the foam insulation material 6 is smaller than that in the conventional four-point injection, so the foam progress surfaces are mutually connected. The decrease in fluidity due to the interference is suppressed, and the foam heat insulating material 6 can be efficiently flowed to the final filling portion at the center portion of the front plate 3a. The foam heat insulating material 6 can be appropriately changed according to the expansion ratio.

  Moreover, since the arrangement | positioning position of the injection ports 8 and 9 of this embodiment is provided in the same position on the diagonal, if the quantity of the foaming heat insulating material 6 inject | poured is the same, it foams in the substantially same state, respectively. Therefore, the uniformity of the overall density (the ratio of bubbles) of the foamed heat insulating material 6 after being cured can be increased. That is, the bubble distribution uniformity can be improved.

  It is also possible to change the amount of the foam insulation material 6 injected from the injection ports 8 and 9. For example, with respect to the amount of the foam insulation material 6 injected from the inlet 8 disposed on the lower side of the hot water storage tank 2, the foam insulation 6 injected from the inlet 9 disposed on the upper side of the hot water storage tank 2. The following actions and effects can be obtained by increasing the injection amount.

  In this case, since there is a large injection amount of the foam heat insulating material 6 injected from the inlet 9 disposed on the upper side of the hot water storage tank 2, the foam heat insulating material 6 from the inlet 8 disposed on the lower side of the hot water storage tank 2 is used. In comparison with the above, many foamed heat insulating materials 6 start to foam and grow.

  Therefore, since the foaming progress surface of the foam heat insulating material 6 injected from the injection port 9 proceeds toward the lower side of the hot water storage tank 2 in an early time, the foam heat insulating material 6 with the foam heat insulating material 6 from the injection port 8 The “joint” or “final filling portion” is formed on the lower side of the hot water storage tank 2. As described above, since the “joint” or “final filling portion” having poor heat insulation performance exists on the lower side of the hot water storage tank 2 having a low temperature, the heat insulation performance on the upper side of the hot water storage tank 2 is lowered. Can be suppressed.

  FIG. 6 is a cross-sectional view of the hot water storage tank unit. As shown by the dot display 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 vacuum heat insulating material 5 stuck inside 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 sides in the hot water storage tank unit 1A, gaps s1, s1 are formed between the outer box 3A and the vacuum heat insulating material 5 closest to the outer box 3A, and the foam heat insulating material 6 is formed in each gap s1. It is designed to be filled. 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. Thus, by forming the gap s3 between the hot water storage tank 2 and the outer box 3A and the gaps s1, s1, s2 between the vacuum heat insulating material 5 and the outer box 3A, the heat in the hot water storage tank 2 is increased. Further, leakage through the vacuum heat insulating material 5 to the outside of the outer box 3A can be suppressed.

  Further, by using the foam heat insulating material 6 to be foamed after injection, the gaps around the gaps s1, s2, s3, the upper end plate 2b, and the lower end plate 2c that cannot be filled with the vacuum heat insulating material 5 are filled with the foam heat insulating material 6. be able to. Thereby, the improvement of heat insulation performance can be aimed at.

  In this embodiment, since the flow resistance due to the interference of the foaming progress surface of the foam heat insulating material can be reduced and the foam heat insulating material can be smoothly filled to the final filling portion, the foam heat insulating material has a low density, that is, a standard of density distribution. Knitting difference can be reduced. When the standard knitting difference of the density distribution of the foam heat insulating material in the conventional product is 1.0, it is 0.7 in this embodiment, and the density distribution of the foam heat insulating material is improved.

  Thus, according to the present embodiment, the two foam heat insulating material inlets are diagonally located at the same position relative to the center line of one surface (front plate) of the outer box containing the hot water storage tank. It was set as the structure which inject | pours a liquid foam heat insulation material from these two inlets. As a result, the number of “joints” based on foaming of the foam heat insulating material is reduced, and further, the distribution uniformity of the bubbles in the foam heat insulating material is increased, so that deterioration of the thermal conductivity can be suppressed.

  Next, a second embodiment of the present invention will be described. The second embodiment is different from the first embodiment in that the arrangement positions of the injection port 8 and the injection port 9 are changed.

  In FIG. 7 which becomes 2nd Embodiment, in the state which mounted the hot water storage tank unit so that the front board 3a which installs the inlets 8 and 9 of the outer box 3A may face upwards, the inlet of the foam heat insulating material 6 8 and 9 are arranged at symmetrical positions with respect to the center line C1 along the longitudinal direction of the front plate 3a, and the two inlets 8 and 9 are the hot water storage tank 2 when the foam heat insulating material 6 is injected. Is provided at a position where it does not interfere with the vacuum heat insulating material 5 attached to the inside of the outer casing 3A.

  Thus, even when the injection ports 8 and 9 are provided at positions symmetrical to the center line C1 along the longitudinal direction of the front plate 3a, the amount of the injected foam insulation 6 is the same. If it exists, since foaming is performed in substantially the same state, the uniformity of the overall density (the ratio in which bubbles are present) of the foamed heat insulating material 6 after curing can be increased. That is, the bubble distribution uniformity can be improved.

  In the hot water storage tank unit according to the present embodiment, when comparing the standard difference in density distribution with the conventional product, it was 1.0 in the conventional product, compared with 1.0 in the present product, which is the foam insulation. The density distribution of the material was improved.

  On the other hand, when the inlets 8 and 9 of the foam heat insulating material 6 are arranged at asymmetric positions on the left and right with respect to the center line C1 along the longitudinal direction of the front plate 3a, when comparing standard knitting differences in density distribution, It became 1.1 compared with the product, and the density distribution of the foam heat insulating material 6 deteriorated. This is probably because the inlets 8 and 9 are not symmetrical, and the balance of the density distribution has deteriorated.

  Next, a third embodiment of the present invention will be described. The third embodiment is also different from Example 1 in that the arrangement positions of the injection port 8 and the injection port 9 are changed.

  In FIG. 8 which becomes 3rd Embodiment, in the state which mounted the hot water storage tank unit so that the front board 3a which installs the injection port of the outer box 3A may face upwards, the injection ports 8 and 9 of the foam heat insulating material 6 Are arranged at positions vertically symmetrical with respect to the center line C2 along the short direction of the front plate 3a, and these two inlets 8 and 9 are arranged around the hot water storage tank when the foam heat insulating material 6 is injected, And it is provided in the position which does not interfere with the vacuum heat insulating material 5 stuck inside 3A of outer boxes.

  Thus, even when the injection ports 8 and 9 are provided at positions vertically symmetrical with respect to the center line C2 along the short direction of the front plate 3a, the amount of the injected foam heat insulating material 6 is the same. Then, since foaming is performed in substantially the same state, the uniformity of the overall density (the ratio of bubbles) of the foamed heat insulating material 6 after curing can be increased. That is, the bubble distribution uniformity can be improved.

  In the hot water storage tank unit according to the present embodiment, when comparing the standard difference in density distribution with the conventional product, it was 1.0 in the conventional product, compared with 1.0 in the present product, which is the foam insulation. The density distribution of the material was improved.

  On the other hand, when the inlets 8 and 9 of the foam heat insulating material 6 are arranged at asymmetric positions in the vertical direction with respect to the center line C2 along the short direction of the front plate 3a, when comparing the standard knitting differences in density distribution, The density distribution of the foam heat insulating material 6 was deteriorated to 1.1 compared with the conventional product. This is considered to be due to the fact that the inlets 8 and 9 are not vertically symmetric and the balance of the density distribution has deteriorated.

  In the first to third embodiments described above, the two inlets are provided in the front plate 3a of the outer box 3A. Similarly, the two inlets are provided on the side plate 3b or the rear plate 3c under the same conditions. It is also possible to provide.

  As described above, according to the present invention, the center line of one surface of the outer box containing the hot water storage tank is vertically symmetric, left / right symmetric, or diagonally at the same position. A point of the foamed heat insulating material was installed, and the liquid foamed heat insulating material was injected from these two points of the inlet.

  According to this, the number of “joints” based on foaming of the foam heat insulating material is reduced, and further, the distribution uniformity of bubbles in the foam heat insulating material is increased, so that deterioration of thermal conductivity can be suppressed. Become.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1A ... Hot water storage tank unit, 2 ... Hot water storage tank, 3A ... Outer box, 3a ... Front plate, 3b ... Side plate, 3c ... Rear plate, 3d ... Top plate, 3e ... Bottom plate 4, 4A, 4B, 4C ... Inner leg, 8, 9 ... Inlet, 3s ... Piping cover, 5 ... Vacuum heat insulating material, 6 ... Foam heat insulating material, 11 ... Water supply pipe, 12 ... Water supply pipe, 13 ... Hot water supply pipe, 14 ... Hot water supply pipe, 15 ... Bath return pipe.

Claims (3)

A hot water storage tank and an outer box that accommodates the hot water storage tank, and various pipes connected to the hot water storage tank, and injecting and foaming a liquid foam insulation material between the outer box and the hot water storage tank. In the hot water storage tank unit with the formed foam insulation,
Two injection holes for the foamed heat insulating material at a vertically symmetric position, a horizontally symmetric position, or the same position diagonally with respect to the center line of one surface of the outer box containing the hot water storage tank The hot water storage tank unit is characterized in that the foamed heat insulating material in liquid form is injected from the two injection ports. The hot water storage tank unit according to claim 1,
The “joint” generated by foaming of the foam insulation material is formed by a single line, and at least one gas discharge hole for discharging foaming gas on the line is provided in the outer box at a position facing the line. Hot water storage tank knit characterized by being provided. In the hot water storage tank unit according to claim 1 or claim 2,
The hot water storage tank unit characterized in that the standard deviation of the density distribution of the foam insulation is 0.8 or less.

Images