JP6420577B2 - Hot water storage water heater - Google Patents

Description

  Embodiments of the present invention relate to a hot water storage type hot water supply apparatus that mixes high-temperature water stored in a hot water storage tank and water from a water supply source into hot water having a set temperature and supplies the hot water to a hot water supply destination.

  The hot water storage type hot water heater generates high-temperature hot water by operating a heating means that is, for example, a heat pump unit, and stores it in a hot water storage tank during a time period when a cheap nighttime electricity charge is applied. During the daytime, hot water is taken out from the hot water storage tank and mixed with water guided from the water supply pipe, and hot water is supplied to the bathtub, kitchen, bathroom, and washroom in the state of hot water at the set temperature.

  The hot water storage tank used here is formed by integrating a bowl-shaped end plate on the upper and lower ends of a cylindrical body by means such as welding, and is covered with front / rear / right / left and upper / lower hexahedron cases. The hot water storage tank has a very long vertical dimension compared to its diameter, so even if there are vibrations or shaking caused by an earthquake, the hot water tank itself must be controlled so that it does not collapse. I must.

  In Patent Document 1, a hot water pipe reinforcing bracket is attached to the upper end portion of the hot water storage tank, the lower surface of the seismic reinforcing bracket is fixed to the upper surface of the hot water pipe reinforcing bracket, and the collar and one end of the seismic reinforcing bracket are attached to the support (wall surface). A technique is disclosed in which the other end of the attached seismic connecting metal fitting is fixed with a bolt that passes through the top plate of the exterior (housing) to regulate the shaking of the upper part of the hot water storage tank when an earthquake occurs.

JP-A-11-37559

  However, high temperature water is stored in the upper part of the hot water storage tank, and the temperature is higher than that in the middle part and the lower part. On the other hand, in the above-mentioned technique, since the hot water pipe reinforcing metal fittings, the hot water pipe reinforcing metal fittings, and the seismic reinforcing metal fittings which are metal members are attached to the upper end portion of the hot water storage tank, the amount of heat leakage from these metal members becomes large. End up.

  In addition, attach the flange of the hot water pipe reinforcement bracket to the upper surface of the hot water storage tank by spot welding, correctly overlap the bottom surface of the earthquake resistant reinforcement bracket and the upper surface of the hot water pipe reinforcement bracket, attach the nut to the hot water pipe reinforcement bracket, and insert the mounting bolt It takes a lot of time and effort to manufacture with a complicated structure.

  This embodiment suppresses the amount of heat leakage from the upper part of the hot water storage tank, and reliably regulates the shaking of the hot water storage tank in the event of an earthquake, and contributes to cost reduction with a relatively simple structure. Is to provide.

The hot water storage type water heater of the present embodiment includes a hot water storage tank, a heat insulating material closely attached to a peripheral surface and an upper portion of the hot water storage tank, and a housing that houses the hot water storage tank covered with the heat insulating material. Yes.
The casing is configured by combining an upper panel positioned above the hot water storage tank and a plurality of panels surrounding the peripheral surface of the hot water storage tank. The thermal insulation material may comprise an upper heat insulating material interposed between the upper portion of the upper panel and the hot water storage tank of the housing, the rest of the panel the heat insulating material but one said panel in said housing In addition to being in close contact with each other, a gap is provided between the one panel and the heat insulating material to house the electrical component box. Further, an engaging convex portion protruding upward is integrally formed on a part of the upper heat insulating material, and a locking concave portion into which the engaging convex portion is fitted is integrally formed on a part of the upper panel. ing.

The schematic block diagram of the hot water storage type water heater based on this embodiment. The external appearance perspective view of the hot water storage tank unit based on the embodiment, and a front view. The disassembled perspective view of the hot water storage tank unit based on the embodiment. The vertical side view of the hot water storage tank unit based on the embodiment. The cross-sectional top view of the hot water storage tank unit based on the embodiment. The vertical side view which expanded the hot water storage tank unit upper part based on the embodiment. The vertical side view which expanded the hot water storage tank unit upper part based on the modification of the embodiment.

Hereinafter, this embodiment will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a hot water storage type water heater.
In the figure, reference numeral 1 denotes a hot water storage tank unit including a hot water storage tank 2 for storing hot water. In the figure, reference numeral 3 denotes, for example, a heat pump unit, which is a heating unit that is connected to the hot water storage tank unit 1 via the two communication pipes 4a and 4b and heats the hot water in the hot water storage tank 2.

  The heat pump unit 3 includes a compressor, a refrigerant-water heat exchanger that is a condenser, an electronic expansion valve that is a decompression unit, and a forced air-cooled evaporator using a blower. To communicate with the heat pump refrigeration cycle circuit.

Furthermore, the heat pump unit 3 includes a control unit for the heat pump unit 3 that receives an operation signal from, for example, a remote controller (remote operation panel) installed in the kitchen and controls the compressor and the electronic expansion valve. (All not shown)
One communication pipe 4 a communicates the bottom of the hot water storage tank 2 accommodated in the hot water storage tank unit 1 and the heat pump unit 3, and a circulation pump is provided in the middle part. The other communication pipe 4b communicates the upper part of the hot water storage tank 2 and the heat pump unit 3, and constitutes a return communication pipe 4b.

  A water supply pipe 5 communicating with a water supply source (not shown) (for example, a water pipe) is connected to the bottom of the hot water storage tank 2. A water supply stop valve 6 is provided in the middle of the water supply pipe 5, and water supply from the water supply source to the hot water storage tank 2 and water supply stop can be performed by opening and closing control.

  A hot water discharge pipe 7 is connected to the upper part of the hot water storage tank 2, and this hot water discharge pipe 7 extends from the hot water storage tank unit 1 and is connected to a hot water tap 8 provided facing the bathtub S in the bathroom. The terminal portion of the hot water pipe 7 is branched, and this branched hot water pipe is connected to a hot water tap 9 provided in each of, for example, a kitchen room, a washroom, and a bathroom.

  A mixing valve 10, a flow rate sensor 11, and a mixed hot water temperature sensor 12 are sequentially provided in the middle of the outlet pipe 7. Further, a water supply bypass pipe 13 that branches from between the water supply stop valve 6 in the water supply pipe 5 and the hot water storage tank 2 and supplies water by bypassing the hot water storage tank 2 is connected to the mixing valve 10.

  That is, the mixing valve 10 includes a high-temperature water connection port 10a and a water supply connection port 10b whose opening degree can be controlled. The hot water discharge pipe 7 is connected to the high temperature water connection port 10a, and the water supply bypass pipe 13 is connected to the water supply connection port 10b.

In the mixing valve 10, high temperature hot water guided from the hot water storage tank 2 to the hot water discharge pipe 7 and water guided from the water supply source through the water supply pipe 5 and the water supply bypass pipe 13 are mixed. It can derive | lead-out as warm water of preset temperature by throttling control with respect to the hot water connection port 10a and the feed water connection port 10b.
These communication pipes 4 a and 4 b, the water supply pipe 5, the hot water discharge pipe 7, and the water supply bypass pipe 13 are referred to as piping parts H.

  The hot water storage tank 2 is provided with a plurality of tank temperature sensors 15 with a predetermined interval in the vertical direction of the hot water storage tank 2. The amount of storage in the hot water storage tank 2 is determined by the on / off signal of each tank temperature sensor 15.

  The hot water storage tank unit 1 is provided with a control unit 16. The control unit 16 receives the detection signal from the tank temperature sensor 15 and the like, performs calculation, and sends a control signal to the water supply stop valve 6 and the mixing valve 10.

  The remote controller (not shown) is also connected to the control unit 16 of the hot water storage tank unit 1 and controls the entire hot water storage type water heater. Specifically, the operation of the hot water storage water heater can be stopped, the hot water temperature can be set, the hot water volume of the bathtub can be set, the hot water switch for instructing the start of hot water to the bathtub, and various operation modes can be set. A display unit for displaying hot water temperature and the like is provided.

  In the hot water storage type water heater constructed as described above, when it becomes an inexpensive midnight charge time zone, the control unit 16 for the hot water tank unit 1 determines the necessary storage amount on the next day based on the information set in the remote controller. Calculate. This information is sent from the control unit 16 to the control unit for the heat pump unit 3, and driving of the compressor and the circulation pump is started.

  The hot water taken out from the bottom of the hot water storage tank 2 is guided to the heat pump unit 3 through the outgoing communication pipe 4a by driving the circulation pump. Here, it is led to the refrigerant-water heat exchanger constituting the heat pump refrigeration cycle circuit and heated. The hot water having a high temperature is returned to the upper part of the hot water storage tank 2 through the return communication pipe 4b.

  Hot water circulates through the hot water storage tank 2 and the heat pump unit 3, and the hot water storage tank 2 fills up with hot water as the operation time elapses. A hot water storage temperature sensor provided in the hot water storage tank 2 or a heat inlet temperature sensor (not shown) provided in the outgoing communication pipe 4a communicating the circulation pump and the water-refrigerant heat exchanger exceeds the set temperature. Detect.

  This detection signal is sent to the control unit 16 for the hot water tank unit 1, and the control unit 16 sends a heating stop signal to the control unit for the heat pump unit 3, and the control unit controls the drive stop of the compressor and the circulation pump. The hot water storage tank 2 is filled with high-temperature water at a set temperature, the storage is completed, and a hot water supply operation such as during the day is awaited.

  For example, when the hot water tap 9 of the kitchen is opened during the daytime or the like, this is detected by the flow sensor 11 and the water supply stop valve 6 is opened, and water is guided from the water supply source to the bottom of the hot water storage tank 2 through the water supply pipe 5. The hot water in the upper part of the hot water storage tank 2 is pushed up to the hot water discharge pipe 7 by the supply water pressure from the water supply pipe 5 and supplied to the mixing valve 10.

  On the other hand, the water led to the feed water pipe 5 is diverted to the feed water bypass pipe 13 and mixed with the high temperature water fed to the mixing valve 10 and supplied from the hot water storage tank 2. The hot water whose temperature has decreased is guided to the flow sensor 11 to measure the flow rate, and the temperature of the hot water is detected by the mixed hot water temperature sensor 12.

  The detection signal of the mixed hot water temperature sensor 12 is sent to the control unit 16 for controlling the hot water storage tank unit 1, and the control unit 16 calculates and sends the control signal to the mixing valve 10. The opening amounts of the high-temperature water connection port 10a and the water supply connection port 10b (or only the high-temperature water connection port 10a) in the mixing valve 10 are controlled, become hot water of a set temperature, led to the hot water tap 9, and hot water is supplied.

  2A is an external perspective view of the hot water storage tank unit 1, and FIG. 2B is a front view of the hot water storage tank unit 1. 3 is an exploded perspective view showing components of the hot water storage tank unit 1, FIG. 4 is a longitudinal side view of the hot water storage tank unit 1, and FIG. 5 is a transverse plan view of the hot water storage tank unit 1. 4 and 5, the hot water storage tank 2 is not cross-sectional.

  The appearance of the hot water storage tank unit 1 is composed of a housing 20 that is supported by support legs 19. The housing 20 is a rectangular parallelepiped having a front panel 21, a left side panel 22, a right side panel 23, a back panel 24, a top panel 25 and a bottom plate 26, and a plurality of bottom plates 26 (three). ).

  The front panel 21 that forms the front of the housing 20 has a first front panel 21a that protrudes from the upper end to the lower part on the front surface, and a second front panel 21a that is recessed from the lower part to the lower end to the back side to some extent from the first front panel 21a. Front panel 21b, and a horizontal intermediate panel 21c (see FIG. 4) connecting the lower end of the first front panel 21a and the upper end of the second front panel 21b. Each of the panels 21a to 21c is rectangular. Make.

The left side panel 22 and the right side panel 23 have a rectangular shape, and the front end portions thereof are integrated with the side edges of the first front panel 21a, the second front panel 21b, and the intermediate panel 21c. It is formed in a shape.
The back panel 24 has a rectangular shape that combines the areas and shapes of the first front panel 21a and the second front panel 21b, which are the front panel 21.

  The top panel 25 has a rectangular shape determined by the width-direction dimensions of the left and right side panels 22 and 23, the first front panel 21 a of the front panel 21, and the back panel 24. A locking recess 25a, which will be described later, is formed at the center of the inner surface of the upper panel 25.

  The bottom plate 26 has a rectangular shape determined by the width dimensions of the left and right side panels 22 and 23, the second front panel 21 b of the front panel 21, and the back panel 24. An inclined surface is formed at a lower position from the peripheral end toward the center, and a drain pipe (not shown) is attached to the center.

  As shown in FIG. 3, the hot water storage tank unit 1 accommodates the hot water storage tank 2 whose entire peripheral surface is covered with the heat insulating material Z and the electrical components constituting the control unit 16 in the casing 20 described above. The electrical component box 27, the piping component mounting plate 28, and the piping component H are accommodated.

  The hot water storage tank 2 includes a cylindrical tank body 2A, and hemispherical (saddle-shaped) upper and lower end panels 2B and 2C which are attached to and integrated with the upper and lower ends of the tank body 2A by means of welding or the like. Become. Compared to the diameter dimension of the tank body 2A, the total length of the tank body 2A and the total height of the upper and lower end plates 2B and 2C are extremely long.

  The heat insulating material Z covers the entire circumferential surface of such a hot water storage tank 2. The heat insulating material Z is divided into a plurality (four bodies), and includes a front heat insulating material 30, a rear heat insulating material 31, an upper heat insulating material 32, and a lower heat insulating material 33.

  In other words, the front heat insulating material 30 and the rear heat insulating material 31 divided in the front and rear directions are attached in close contact with the peripheral surface of the tank body 2A constituting the hot water storage tank 2. The matching edge a of the front heat insulating material 30 and the rear heat insulating material 31 substantially coincides with the position of the central axis b in the front-rear direction (width direction) of the left and right side panels 22 and 23.

  The mating edge a of the front heat insulating material 30 and the rear heat insulating material 31 and the surface portion in the periphery thereof form a flat portion m. And each center axis | shaft c of the front part heat insulating material 30 and the rear part heat insulating material 31 and the surface part of the peripheral part also comprise the flat part m.

  The front surface portions of the front heat insulating material 30 and the rear heat insulating material 31 other than the flat portion m are curved and have the same thickness as the back surface shape that is in close contact with the hot water storage tank 2. Accordingly, each flat portion m is formed thin.

  As shown in FIGS. 4 and 5, the first front panel 21 a constituting the front panel 21 is assembled with a gap between the front heat insulating material 30 and the second front panel. Only 21b is in close contact with the flat portion m described above on the surface of the front heat insulating material 30, and is assembled with a surface portion other than the flat portion m.

In the gap between the first front panel 21a and the front heat insulating material 30, the electric component box 27, the pipe mounting plate 28, and the pipe part H described above are interposed.
The rear panel 24 is in close contact with the flat portion m of the rear heat insulating material 31, and the surface portion other than the flat portion m of the rear heat insulating material 31 is assembled with the rear panel 24 with a gap.

  The left side panel 22 and the right side panel 23 are in close contact with the mating edge a of each of the front heat insulating material 30 and the rear heat insulating material 31 and the flat part m formed in the periphery thereof, and the front and rear parts other than the flat part m The surfaces of the heat insulating materials 30 and 31 are assembled with a gap.

That is, the front and rear heat insulating materials 30 and 31 attached to the peripheral surface of the tank body 2A constituting the hot water storage tank 2 are partially the second front panel 21b of the front panel 21, the left and right side panels 22 and 23, and the rear panel. 24.
In other words, the front and rear heat insulating materials 30 and 31 are closely interposed between the hot water storage tank 2 and the left and right side panels 22 and 23 and the rear panel 24.

However, despite the front heat insulating material 30 to the hot water storage tank 2 is attached, has a front most of the hot water storage tank 2, a first front panel 21a that forms the majority of the front panel 21, the adhesion was It has a gap. As described above, the electrical component box 27 and the like are disposed in this gap.

An upper heat insulating material 32 is attached to the upper end plate 2 </ b> B constituting the upper part of the hot water storage tank 2. The relationship between the upper heat insulating material 32 and the upper panel 25 constituting the housing 20 will be described later.
A lower heat insulating material 33 is attached to the lower end plate 2C constituting the lower part of the hot water storage tank 2. The bottom plate 26 constituting the housing 20 has an inclined surface as described above, and has a gap with the lower heat insulating material 33. That is, the bottom plate 26 has a drain pan function for collecting drain water dripping from the hot water storage tank 2 and the heat insulating material Z and discharging it to the outside.

FIG. 6 is a longitudinal sectional view of the upper part of the hot water storage tank unit 1 and shows only a part of the hot water storage tank unit 1 shown in FIG. As in FIG. 4, the hot water storage tank 2 is not cross-sectional.
As described above, the hot water storage tank 2 includes a cylindrical tank body 2A, and a hemispherical (saddle-shaped) upper end plate 2B integrally provided by welding or the like on the upper and lower ends of the tank body 2A. It consists of a lower end plate 2C.

  The upper heat insulating material 32 is attached to the upper end plate 2B, and the back surface of the upper heat insulating material 32 is in close contact with the surface of the upper end plate 2B. The surface of the upper heat insulating material 32 has a center axis d position and a peripheral portion protruding from other portions, and a circular engagement convex portion 32a is formed in a plan view.

  The cross-sectional shape of the engaging convex portion 32a is bent with substantially the same curvature as that of the upper end plate 2B constituting the hot water storage tank 2, forms a similar shape, and has substantially the same thickness. The cross-sectional shape of the outer periphery from the engaging convex portion 32a is bent with substantially the same curvature as that of the upper end plate 2B, forms a similar shape, and has substantially the same thickness.

With respect to the upper heat insulating material 32, the upper surface panel 25 is formed so as to bulge upward only at the central axis d and its peripheral portion, and is bent with substantially the same curvature as the locking recess 25 a of the upper surface panel 25. The above-described locking recess 25a has a circular shape when viewed. The locking recess 25 a of the upper surface panel 25 is fitted into the engagement protrusion 32 a of the upper heat insulating material 32.
Here, it is preferable that the topmost portion of the locking convex portion 32a protrudes higher than the height of the upper edge of the outer peripheral edge of the top panel 25.

  Therefore, the front and rear heat insulating materials 30, 31, the upper heat insulating material 32, and the lower heat insulating material 33 are attached to the hot water storage tank 2, and the front panel 21, the left and right side panels 22, 23, the rear panel 24, the upper panel 25, and the like. The bottom plate 26 is assembled to constitute the casing 20, and the hot water storage tank 2 is accommodated in the casing 20 via the heat insulating material Z.

  Most of the front panel 21 (first front panel 21a) has a gap with the front heat insulating material 30 that is in close contact with the hot water storage tank 2, and an electrical component box 27 and the like are interposed in this gap. In contrast, the front and rear heat insulating materials 30 and 31 are closely interposed between the left and right side panels 22 and 23 and the back panel 24 and the hot water storage tank 2. In addition, the upper heat insulating material 32 is closely interposed between the upper panel 25 and the upper part of the hot water storage tank 2.

As described above, the hot water heated to the high temperature by the heat pump unit 3 is returned to the upper part of the hot water storage tank 2 through the return communication pipe 4b. Since the heating action of the heat pump unit 3 is performed not only in the midnight fee time zone but also during hot water supply during the day, the upper part of the hot water storage tank 2 is always filled with hot water.
Therefore, the temperature sensor 15 attached to the upper part of the hot water storage tank 2 always detects a higher temperature than the temperature sensor 15 attached to the lower part.

  Compared to the conventional structure with a hot water pipe reinforcement fitting for mechanically fixing the upper part of the hot water storage tank, an anti-seismic reinforcement fitting, and an anti-collapse structure by attaching an earthquake-resistant fitting to the support (wall). Thus, there is almost no amount of heat leakage from the upper part of the hot water storage tank, a great improvement in thermal efficiency can be obtained, and the structure is relatively simple, and the influence on the cost can be reduced.

  In addition, in the upper heat insulating material 32, the central axis d and the peripheral portion thereof are formed as thicker engaging convex portions 32a than other portions, and the wall thickness is increased. An effect will be obtained.

  An upper heat insulating material 32 is attached to the upper part of the hot water storage tank 2, and a locking concave portion 25 a formed on the upper panel 25 is fitted into an engaging convex portion 32 a provided on the upper heat insulating material 32. Further, the heat insulating material Z is densely interposed between the left and right side panels 22 and 23, the back panel 24, and the top panel 25 constituting the housing 20.

  However, there is a gap between the front panel 21 and the front heat insulating material 30 attached to the hot water storage tank 2 in order to secure a space for arranging the electrical component box 27 and the like. Originally, when a huge earthquake occurs, a gap is formed between the hot water storage tank 2 and the front panel 21 (the first front panel 21a), so that the hot water storage tank 2 sways on the front panel 21 side alone. easy.

  However, since the engaging concave portion 25a of the upper surface panel 25 is fitted into the engaging convex portion 32a of the upper heat insulating material 32, the shaking of the hot water storage tank 2 alone can be controlled to the maximum. In addition, since the upper part of the tank is locked to the front panel 21, the left and right side panels 22, 23, and the rear panel 24 via the upper heat insulating material 32 and the upper panel 25, it can be swayed in any direction. In addition, the load is distributed to each panel, and the bias of the load on a specific panel can be reduced.

  As shown in FIG. 4, the hot water storage tank unit 1 is usually arranged with a certain gap from the house wall surface K. It is only necessary to supplement the shaking regulating member 40 between the wall surface K of the house and the hot water storage tank unit 1.

  Since only a part of the upper surface panel 25 is provided with the locking recess 25a, the casing 20 is not enlarged more than necessary, and the appearance of the hot water storage tank unit 1 is not impaired. That is, it is not necessary to bring about demerits such as housing costs, transportation costs, and merchandise.

  Even if rainwater falls on rainy weather, the upper surface panel 25 has a locking recess 25a bulging upward, so that rainwater smoothly flows down from the side surface of the housing 20 and does not accumulate on the upper surface. The appearance can be expected to improve for a long time.

FIG. 7 is a longitudinal sectional view of the upper part of the hot water tank unit 1 showing a modification of the present embodiment. However, as in FIG. 6, the hot water storage tank 2 itself is not in a longitudinal section.
The shape structure of the upper part of the hot water storage tank 2 is the same as described above. An upper heat insulating material 32 having an engaging convex portion 32 b is attached to the upper part of the hot water storage tank 2, and an upper panel 25 having a locking concave portion 25 b that constitutes the housing 20 via the upper heat insulating material 32. It is the same that it is attached.

  Here, the engaging convex portion 32b provided on the upper heat insulating material 32 has the same planar shape and cross-sectional area as described above, but is substantially cylindrical and has a large upward protruding amount. . Accordingly, the thickness of the peripheral portion excluding the engaging convex portion 32b is the same as that described above, but only the portion where the engaging convex portion 32b is provided is formed to be thick.

  The locking recess 25b formed on the top panel 25 is also similar in plan shape and area to that described above, but the amount of protrusion of the engaging protrusion 32b is increased and the amount of upward bulging is increased. ing. Specifically, the locking recess 25b not only fits on the upper surface of the engagement projection 32b but also fits on a part of the peripheral surface, so that the engagement projection 32b is more than that shown in FIG. And the fitting strength of the locking recess 25b increases, and the above-described effects become more remarkable.

  Although there is no limitation on the planar shape and area of the engaging convex portions 32a and 32b provided on the upper heat insulating material 32 and the engaging concave portions 25a and 25b provided on the top panel 25, in order to obtain a reliable engaging strength with each other. For example, in the hot water storage tank unit 1 having a height of 540 L and a hot water storage tank 2 having a diameter of 650 mm, when the upper heat insulating material 32 is made of a foamed resin having a bending stress of 0.3 Mpa, the engaging protrusion 32a By making the diameter of 72 mm or more, it is possible to withstand a horizontal acceleration of about 1.5 G.

  The engaging protrusions 32a and 32b and the locking recesses 25a and 25b are circular in plan view, but are not limited to this, and may be polygonal, rectangular, or donut-shaped. Furthermore, although it was set as the same curvature as the hot water storage tank 2 upper part, it is good also as a different curvature or a flat surface.

  The hot water storage tank 2 is composed of the tank body 2A and the upper and lower end panels 2B and 2C. However, depending on the model, only the tank body 2A may have a flat disk attached to the upper and lower ends. The top surface of the upper heat insulating material 32 is also flat. However, the engaging convex part 32a provided in the upper heat insulating material 32 is not necessarily limited to the upper surface being flat, and the cross section may be curved with a predetermined curvature.

  In addition, the above-mentioned embodiment is shown as an example and does not intend limiting the range of embodiment. The novel embodiment can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

Z ... heat insulating material, 2 ... hot water storage tank, 20 ... housing, 21 , 22 , 23 , 24 ... panel (front panel 21, left side panel, right side panel, rear panel), 25 ... top panel, 25a, 25b ... Locking recess, 27... Electrical component box, 32... Upper heat insulating material, 32 a and 32 b.

Claims (2)

A hot water storage tank,
A heat insulating material in close contact with the peripheral surface and top of the hot water storage tank;
A housing for housing the hot water storage tank , which is configured by combining a top panel located above the hot water storage tank and a plurality of panels surrounding the peripheral surface of the hot water storage tank and covered with the heat insulating material; ,
The thermal insulation material may comprise an upper heat insulating material interposed between the upper portion of the upper panel and the hot water storage tank of the housing, the rest of the panel the heat insulating material but one said panel in said housing A gap is provided between the one panel and the heat insulating material to hold the electrical component box,
A hot water storage in which an engaging convex part protruding upward is integrally formed on a part of the upper heat insulating material, and an engaging concave part into which the engaging convex part is fitted is integrally formed on a part of the upper panel. Type water heater. The hot water storage type water heater according to claim 1, wherein the engagement convex portion has a shape similar to an upper shape of the hot water storage tank .

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