JP2008082666A - Hot water storage type electric water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type electric water heater that can be installed in a limited installation space and excels in boiling-up performance of water and hot water in a hot water storage tank and in pushing-out performance of hot water. <P>SOLUTION: The hot water storage type electric water heater has the hot water storage tank 10; a water inlet part 11 provided in a predetermined position of the hot water storage tank; a hot water discharge part 12 provided in a position different from the water inlet part of the hot water storage tank; and a partition structure 20 provided to form a plurality of passages from the vicinity of the water inlet part in the hot water storage tank to the vicinity of the hot water discharge part. The hot water storage tank is provided such that the lateral length of the hot water storage tank is longer than its vertical height in the installed state of the hot water storage type electric water heater, and the partition structure is provided with communicating openings 25 to allow at least part of the adjacent passages to communicate with each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a horizontally installed hot water storage type electric water heater that can be installed in a limited installation space.

  Conventionally, a hot water storage type electric water heater that is installed in a vertically long state on a wall of a building and puts water from a lower part of a hot water storage tank and discharges hot water from the upper part has been widely used. The reason why the hot water storage tank is so long in the installed state is that the hot water can be pushed out by using the action of the hot water naturally rising due to the difference in density between the hot water and the water when the water entered from the bottom of the hot water tank is warmed. That is, the performance of stably extruding high-temperature hot water is enhanced. In recent years, for example, an electric water heater is often installed directly in a toilet room in order to supply hot water to a faucet for hand-washing such as in a toilet room.

  When installing a hot water storage type electric water heater in a toilet room, the hot water storage type electric water heater itself is installed directly on the wall surface in a vertically long state as before, so as not to impair the aesthetics and unity of the interior of the toilet room. Instead, for example, as shown by a dotted line in FIG. 13, it is desired to place the hot water storage tank 50 in a state where it is not visible from the toilet room on the back of the basin counter or cabinet.

  In addition, the aspect which installs such a hot water storage tank 50 in the state where it lays down can be applied, for example, also when installing a hot water storage type electric water heater in the underside of a kitchen counter or a kitchen part of a kitchen cabinet. Such a configuration is widely desired because it is not necessary to install a hot water storage type electric water heater on the wall surface, and the beauty and interior of the kitchen room can be improved.

  In the case of a hot water storage type electric water heater installed in such a laid state, in order to install it in a narrow space such as the lower surface of the counter, it is necessary to make the hot water storage tank 50 quite flat and thin. However, in the case of a hot water type electric water heater having a horizontally long hot water storage tank 50 whose height in the vertical direction is lowered and flattened, if the amount of hot water is kept constant and the height is simply lowered, Therefore, the surface in contact with hot water becomes wider and the hot water and water can be mixed easily. Then, the special structure which improved the extrusion property of the laying-down type hot water storage type electric water heater provided with such a thin hot water storage tank is also considered (for example, refer patent document 1).

As shown in FIG. 14, the hot water storage type electric water heater described in Patent Document 1 is provided with a honeycomb body 51 having an elongated gap inside the hot water storage tank 50, and each channel cross-sectional area in the hot water storage tank is reduced. Thus, the water is not mixed with the hot water at the time of water supply, and the hot water is pushed out to the hot water outlet part side at a high temperature.
Japanese Patent Laid-Open No. 7-12405 (FIG. 1)

  According to the conventional hot water storage type electric water heater having such a configuration, the pushability of hot water is improved. However, since the water and hot water in each flow path are blocked by the partition walls of the honeycomb body 51, In the case where a heater for boiling is provided, the boiling of water or hot water in the hot water storage tank is caused by heat conduction between the flow paths through the honeycomb body 51 or both ends 51a and 51b of the honeycomb body 51 and the hot water storage tank 50. In addition to the convection of water and hot water in the slight convection spaces X and Y respectively formed between the both end wall portions 50a and 50b, for example, in the hot water storage tank through the spaces X and Y and the upper and lower honeycomb channels This is done by convection of a large detour path along the vicinity of the peripheral wall. However, sufficient heat is not transferred by heat conduction between the flow paths via the honeycomb body 51, and only the convection spaces X and Y on both sides of the hot water storage tank 50 and hot water storage through the spaces X and Y and the honeycomb flow path. In the heat transfer by convection of a large bypass path along the vicinity of the inner wall of the tank, there is a difference in convection in each flow path, and there is a possibility that water or lukewarm water in the flow path stagnate. Efficient boiling is not performed. For this reason, when the amount of hot water discharged from the hot water outlet 53 is large, it takes time to boil the water in the hot water storage tank again, resulting in an unusable hot water storage type electric water heater.

  Further, in order to solve such a problem of boiling property, a heater 60 and a circulation pump 61 as shown in FIG. 15 are provided outside the hot water storage tank 50 to boil hot water, and the heated hot water is heated. A structure is also considered in which water is supplied to the hot water storage tank by the circulation pump 61 and the circulation pipe 62 and the water in the hot water storage tank is returned to the heater 60 by the circulation pipe 63 and heated.

  However, in such a structure, the size of the entire hot water storage type electric water heater is increased, so that the hot water storage type electric water heater is accommodated in a limited storage space below the counter of the toilet room or kitchen as shown in FIG. In this case, a considerably large storage space is occupied, and other equipment that should originally be stored in these storage spaces cannot be stored.

  An object of the present invention is a horizontal-type hot water storage type electric water heater that can be installed in a limited installation space, and is excellent in boiling water and hot water in a hot water storage tank and extruding hot water. Is to provide a vessel.

In order to solve the problems described above, a hot water storage type electric water heater according to the present invention is:
A hot water storage tank, a water inlet section provided at a predetermined position of the hot water storage tank, a hot water outlet section provided at a position different from the water inlet section of the hot water storage tank, and from the vicinity of the water inlet section in the hot water storage tank to the vicinity of the hot water outlet section. A hot water storage type electric water heater having a partition structure provided so as to form a plurality of flow paths, wherein the hot water storage type electric water heater is installed from the height in the vertical direction of the hot water storage tank. In the hot water storage type electric water heater equipped with the hot water storage tank so that the length in the lateral direction becomes longer,
The partition structure is provided with a communication opening so that the at least some of the adjacent flow paths communicate with each other.

  Even if the hot water storage type electric water heater is of such a so-called horizontal type, a plurality of independent flow paths are formed by the partition structure, and the sectional area of each flow path is reduced, so that the hot water storage tank The pushability of hot water is improved.

  In addition, by providing such a communication opening in the partition structure, convection of water or hot water occurs between at least some adjacent flow paths, and the flow is disturbed compared to the case where there is no communication opening. It becomes a three-dimensionally complicated convection. As a result, heat transfer from the flow path close to the heater to the flow path away from the heater is performed more smoothly, and water and warm water in the hot water storage tank can be efficiently boiled.

The hot water storage type electric water heater according to claim 2 of the present invention is the hot water storage type electric water heater according to claim 1,
In the flow path in which the communication opening is formed, the communication opening is formed in a part of the flow path or over the entire flow path.

  Such a communication opening is formed in a part of the flow path or over the entire flow path, thereby balancing the pushability of hot water in the hot water storage tank and the boiling property of water and hot water. The specifications of the hot water storage type electric water heater can be changed as appropriate so that the overall performance from the adjustment of the water through the hot water extrusion through the adjustment of the water becomes the best.

Moreover, the hot water storage type electric water heater according to claim 3 of the present invention is the hot water storage type electric water heater according to claim 1 or 2,
In the flow path in which the communication opening is formed, two or more communication openings are provided.

  By providing two or more communication openings in the flow path provided with the communication opening, the convection in the vertical direction is further complicated through the communication opening, and the portion where water or lukewarm water stagnates in the hot water storage tank is reduced. This improves the boiling of water and lukewarm water.

Moreover, the hot water storage type electric water heater according to claim 4 of the present invention is the hot water storage type electric water heater according to any one of claims 1 to 3,
All the flow paths in the hot water storage tank are communicated with each other by providing the communication openings in the flow paths of the partition structure.

  By providing such a communication opening, hot water storage via the inflow portion and the outflow portion in the hot water storage tank through the inflow and outflow of water and warm water to the communication opening and the upper and lower flow paths of the partition structure. It also promotes convection of a large detour path along the vicinity of the tank inner wall. Thus, by causing convection of water and hot water in the entire hot water storage tank, the water and warm water in the hot water storage tank can be boiled more efficiently.

Moreover, the hot water storage type electric water heater according to claim 5 of the present invention is the hot water storage type electric water heater according to any one of claims 1 to 4,
The end opening of each flow path formed by the partition structure opens downward from the horizontal direction in the installed state of the hot water storage type electric water heater, and the hot water rising by natural convection in the hot water storage tank is at the end. It is characterized in that it flows into each of the flow paths through the opening portion.

  Since the end opening of each flow path formed by the partition structure has such a structure, the upward flow of hot water in the hot water storage tank is actively guided into each flow path formed by the partition structure. It is possible to boil water and lukewarm water in the entire hot water storage tank more efficiently with a simple structure.

Moreover, the hot water storage type electric water heater according to claim 6 of the present invention is the hot water storage type electric water heater according to any one of claims 1 to 5,
Of the end openings of each flow path formed by the partition structure, the upper end opening in the installed state of the hot water storage type electric water heater protrudes in the horizontal direction from the lower end opening. It is characterized by becoming.

  Since the end opening of each flow path formed by the partition structure has such a structure, the upward flow of the hot water in the hot water storage tank is more actively transferred into each flow path formed by the partition structure. The water and hot water in the entire hot water storage tank can be boiled more efficiently with a simple structure.

The hot water storage type electric water heater according to claim 7 of the present invention is the hot water storage type electric water heater according to claim 6,
In addition to the opening at the end of each flow path formed by the partition structure, an opening for convection promotion is provided below the portion projecting in the horizontal direction of each flow path, and natural convection is provided in the hot water storage tank. The hot water that has risen due to the above has flowed into the respective flow paths through the convection promoting opening.

  By having such an opening for promoting convection below the portion projecting in the horizontal direction of each flow path formed by the partition structure, the upward flow of hot water in the hot water storage tank is more actively introduced into each partition pipe. It can be guided without hesitation, and water in the entire hot water storage tank and lukewarm water can be boiled more efficiently with a simple structure.

A hot water storage type electric water heater according to claim 8 of the present invention is the hot water storage type electric water heater according to any one of claims 1 to 6,
The heater is installed below the partition structure in the installed state of the hot water storage type electric water heater.

  By installing the heater so that it is below the partition structure, it is possible to reduce the volume of the water that is below the heater in the hot water storage tank, which is so-called dead water, and is difficult to be boiled up. Water in the tank and lukewarm water can be boiled more efficiently.

  In addition, since convection due to heater heating occurs up to a slightly lower surface of the heater, if the heater lower surface in the installed state is the same as or lower than the lower surface of the partition structure, each flow of the partition structure occupying many flow paths The water and lukewarm water in the road will be placed in the convection due to the heater heating, so that water can be reduced to the so-called death and can be efficiently heated.

The hot water storage type electric water heater according to claim 9 of the present invention is the hot water storage type electric water heater according to any one of claims 1 to 8,
The hot water storage tank is provided with the hot water storage tank so that the water inlet is positioned lower than the hot water outlet in the installed state of the hot water storage type electric water heater, and the lower surface of the hot water storage tank is lower than the lower surface of the hot water outlet. It is characterized by low.

  In the case of a so-called horizontal hot water storage type electric water heater, since the whole is a flat type, the water that has entered from the water inlet easily spreads over the entire bottom surface of the hot water storage tank. The hot water storage tank has such a structure, but when the water or hot water in the hot water tank convects, it always moves toward the upper part of the hot water tank due to the difference in specific gravity. Only hot hot water that rises can be reliably guided to the hot water outlet, and the pushability of hot water in the hot water storage tank is further improved.

A hot water storage type electric water heater according to claim 10 of the present invention is the hot water storage type electric water heater according to any one of claims 1 to 9,
A plurality of the hot water storage tanks are provided, and the hot water storage tanks are connected to each other in series or in parallel via a connecting pipe.

  By connecting multiple hot water storage tanks in this way, the hot water storage capacity can be increased while increasing the flexibility of the overall shape of the hot water electric water heater, and the hot water storage capacity is limited in the limited installation space of the hot water electric water heater. Larger hot water storage type electric water heater can be installed. Note that when a plurality of hot water storage tanks are connected in series with a connecting pipe, the flow velocity is faster than when connected in parallel, so that hot water is less likely to be mixed during hot water extrusion, and pushability is improved.

  According to the present invention, a horizontal type hot water storage type electric water heater that can be installed in a limited installation space, and is excellent in boiling water and hot water in a hot water storage tank and extruding hot water. Can be provided.

  More specifically, even if the hot water storage type electric water heater is a horizontal type, a plurality of independent flow paths are formed by the partition structure, and the cross-sectional area of each flow path is reduced. The pushability of the hot water in the tank is improved.

  In addition, by providing a communication structure with at least a part of the adjacent flow passages in the partition structure, convection of water or hot water occurs between these flow passages, compared to the case where there is no communication opening portion, Disturbance occurs in the flow, resulting in a three-dimensional complex convection. As a result, the heat transfer from the flow path close to the heater to the flow path after being away from the heater is performed more smoothly, and water and warm water in the hot water storage tank can be efficiently boiled.

  Hereinafter, a hot water storage type electric water heater according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. In the hot water storage type electric water heater 1 according to one embodiment of the present invention, the hot water storage tank is arranged so that the length in the lateral direction is longer than the vertical height of the hot water storage tank in a state where the hot water storage type electric water heater is installed. (Hereinafter, this is simply referred to as “horizontal type”). As shown in FIG. 1, the hot water storage type electric water heater 1 includes a hot water storage tank 10 having a substantially cylindrical shape whose both ends are closed except for the water inlet 11 and the hot water outlet 12, and one end of the hot water tank 10. A hot water storage section 11 provided in the hot water storage tank 10, a hot water storage section 10 provided at the other end of the hot water storage tank 10, and a hot water storage tank 10. A partition structure 20 constituted by arranging a plurality of horizontal plates 21 having a predetermined length in the tank longitudinal direction and a single vertical plate 22 in this embodiment so as to form a lattice in the tank end view, A heater 30 provided inside the tank 10 and a temperature sensor (not shown) provided outside the hot water storage tank 10 are also provided. The left and right edges of the horizontal plate 21 and the vertical edges of the vertical plate 22 of the partition structure 20 are respectively fixed to the inner peripheral wall of the hot water storage tank 10 by welding or the like. Each of the elongated spaces partitioned by the horizontal plates 21 and the vertical plates 22 of the partition structure 20 and the inner peripheral wall of the hot water storage tank 10 forms an independent flow path in the hot water storage tank. In addition, in this embodiment, although the vertical board 22 is one piece, it cannot be overemphasized that it may be comprised by the several vertical board. Further, the partition structure 20 may be inserted and fixed in the tank 10.

  And the hot water storage tank 10 is accommodated in the housing | casing which is not illustrated here. In the case, in addition to the hot water storage tank 10, an unillustrated opening / closing valve interposed between the water inlet portion 11 or the hot water outlet portion 12 of the hot water storage tank 10 and the pipe connected thereto, and a heater drive (not shown) for driving the heater 30 are provided. A control unit is provided.

  The hot water storage tank 10 is made of a metal such as stainless steel (SUS), but may be made of a heat resistant resin instead. Moreover, although the partition structure 20 accommodated in the hot water storage tank is also made of SUS, it may be made of heat resistant resin. When the hot water storage tank 10 and the partition structure 20 are made of metal, their heat resistance and pressure resistance can be improved. On the other hand, when the hot water storage tank 10 and the partition structure 20 are made of resin, these molding costs can be reduced.

  And in the case of the hot water storage tank 10 in this embodiment, the partition structure 20 cooperates with the internal peripheral wall of the hot water storage tank 10 as above-mentioned, and several flow paths which go to the hot water supply part side from the inflow part side in a hot water storage tank. In addition, a communication opening 25 is provided at an appropriate position of each flow path formed by the partition structure, and the flow path and an adjacent flow path are partially communicated through the communication opening 25. ing. In the case of the present embodiment, the communication opening 25 in the installed state of the hot water storage type electric water heater is a portion that forms each flow path of the vertical plate 22 of the partition structure 20 that opens in the horizontal direction as shown in FIG. As shown in part in FIG. 2, the communication openings 25 that are respectively provided in the vertical direction and open in the vertical direction are in the vicinity of both ends that form each flow path of the horizontal plate 21 of the partition structure 20 (in FIG. 2). Only the communication opening 25 in the vicinity of one end is provided in each of the drawings).

  In addition, in this embodiment, although the communication opening part 25 opened toward the perpendicular direction has the structure which exists in the both ends vicinity of the partition structure 20, when a length of a partition structure is long, a partition structure It is preferable that there is a communication opening near the center in the longitudinal direction. The reason for this is that the communication opening portion is preferably opened near the stagnation position in order to reduce stagnation in the partition structure. When the partition structure is long, a stagnation portion with less convection is provided near the center of the partition structure. This is because it tends to occur, so that the water in the hot water storage tank and lukewarm water can be effectively boiled near the center.

  By forming such communication openings 25 at appropriate positions in the portions of the partition structure 20 where the respective flow paths are formed, the hot water storage electric water heater 1 is installed between the hot water storage tanks via the communication openings 25. Water and hot water can be convected up and down. That is, the partition structure 20 forms a plurality of water and hot water flow paths in the hot water storage tank, and communicates between these flow paths through the respective communication openings 25 to It allows hot water convection. In the case of the present embodiment, in each of the flow paths, since two or more communication openings 25 are provided, the convection in the vertical direction is further complicated through the communication openings 25, and water and lukewarm water are supplied. The stagnation part in the hot water storage tank can be reduced, and the boiling property of water and lukewarm water is improved.

  Further, even when the heater is installed not in the vicinity of the center of the bottom of the hot water storage tank but in the left-right direction, this communication opening can promote convection in the left-right direction. In other words, regardless of whether the heater is installed at the center of the hot water storage tank or at the left or right side, it is possible to sufficiently ensure the boiling property of the water or the warm water in the hot water storage tank.

  Moreover, the partition structure 20 is accommodated in the hot water storage tank so that both ends thereof are slightly retracted from both end walls of the hot water storage tank 10, whereby one end of the partition structure 20 (the left end in FIG. 1). And a convection space A having a certain volume is formed between the end wall of the hot water storage tank 10 and the water storage tank 10, and the other end (right end in FIG. 1) of the partition structure 20 and the hot water storage tank A convection space B having a constant volume is also formed between the hot water outlet side end walls.

  In addition to the convection spaces A and B at both ends of the hot water storage tank 10, in addition to this, the other convection space B (A) from the convection space A (B) through the upper and lower partition structures 20 is added. The water or hot water in the hot water storage tank is totally convected in the tank through the large bypass path along the vicinity of the inner peripheral wall of the hot water storage tank and the communication opening 25 formed at an appropriate position of the partition structure. It has become.

  The heater 30 in the hot water storage tank is a rod-like body having the same length as that of the partition structure 20, and has a heating element such as a nichrome wire inside, and the outer side thereof is a completely waterproof insulator. The hot water storage tank 10 is supported by the hot water storage tank 10 when the hot water storage type electric water heater 1 is installed, and is sandwiched between the lower part of the partition structure 20 and the bottom surface of the hot water storage tank 10 when the hot water storage type electric water heater 1 is installed. In the vicinity of the bottom part (lower part in FIG. 1), that is, in the installed state of the hot water storage type electric water heater 1, it is arranged below the partition structure 20.

  And since the partition structure 20 and the heater 30 have the same length as described above, convection can be generated over the entire hot water storage tank 10 by heating with such a heater 30, and the partition structure Convection of water and hot water inside and outside the body is most effectively generated, making it possible to boil hot water evenly in a hot water storage tank. In addition, by increasing the length of the heater 30 in this way, local boiling on the heater surface can be suppressed by lowering the output per unit surface area (watt density), and corrosion of the heater surface and adhesion of scale can be suppressed. By doing so, the durability of the heater can be improved. Furthermore, the possibility that boiling noise is generated due to local boiling is kept low.

  In addition, the heater 30 does not need to extend over the whole longitudinal direction of the hot water storage tank 10 like the above-mentioned embodiment. That is, the heater may be installed in the hot water storage tank in a state where the heater length is shorter than that of the partition structure 20. In this case, the heater is difficult to bend, and the reliability of the hot water storage type electric water heater is improved by improving the vibration resistance during transportation of the hot water storage type electric water heater.

  A temperature sensor (not shown) is made of a temperature sensing element such as a bimetal, and is attached so as to be in direct contact with the upper outer surface of the hot water storage tank when the hot water storage type electric water heater 1 is installed. Is detected to be below a certain temperature, this is notified to the heater control circuit, and the heater 30 is appropriately heated under the control of the heater control circuit to keep the hot water in the hot water storage tank at about 85 ° C. in this embodiment. I am doing so.

  In the present embodiment, “boiling” refers to heating the water in the hot water storage tank or so-called warm water having a relatively low temperature so that the hot water in the hot water storage tank becomes approximately 85 ° C. as a whole. Needless to say, the boiling temperature is appropriately changed according to various specifications of the hot water storage type electric water heater.

  Subsequently, a method of installing the hot water storage type electric water heater 1 having the above-described configuration and an operation when the hot water storage type electric water heater 1 is actually used will be described. When the hot water storage type electric water heater 1 is installed, the hot water storage type electric water heater 1 is placed in the lower part of the counter of the toilet room shown in FIG. Install in a horizontal position so that the length of the direction is long.

  Then, a pipe reaching the primary side of the tap water is connected to the water inlet 11 of the hot water storage tank 10, and a pipe reaching one of the mixing valves connected to the faucet is connected to the hot water outlet 12. The hot water storage type electric water heater 1 according to the present embodiment does not have a configuration in which a heater, a circulation pump, and a circulation pipe are provided outside the hot water storage tank 10, unlike a conventional horizontal type hot water storage type electric water heater. The overall size is small, and space can be saved sufficiently even when installed horizontally in the above-mentioned place.

  Next, by opening the faucet, water from the tap water is stored in the hot water storage tank 10 via the water inlet 11, and the hot water storage tank 10 is filled with water. Next, the power is turned on, and the heater 30 in the hot water storage tank is operated via the heater control circuit.

  Then, the water filled in the hot water storage tank of the hot water storage type electric water heater 1 is heated to about 85 ° C. by the heater 30 and boiled. Thereafter, when the user opens the faucet, water is supplied from the primary pipe of tap water into the hot water storage tank via the water inlet 11 by water pressure. As a result, the heated hot water is pushed out from the hot water outlet 12 of the hot water storage type electric water heater 1 by the supplied amount, mixed with water through the mixing plug, and supplied to the user from the faucet as hot water at an appropriate temperature. At the same time, water is supplied into the hot water storage tank from the primary side pipe of tap water through the water inlet 11 by the supplied amount.

  At this time, when the temperature sensor provided in the hot water storage tank detects the internal temperature and detects that the temperature is lower than the predetermined temperature, the heater 30 in the hot water storage tank is operated via the heater control circuit, and is heated again.

  In this way, when hot water in the hot water storage tank is pushed out, a plurality of narrow flow paths each having a small cross-sectional area partitioned by the partition structure 20 are formed. Without being mixed with hot water, good extrudability of hot water in the hot water storage tank 10 is ensured.

  Further, in the case of the hot water storage type electric water heater 1 of the present embodiment, the water and hot water in the hot water storage tank heated by the heat generated by the heater 30 is between the both end walls of the hot water storage tank 10 and the both ends of the partition structure 20. Convection spaces A and B, and a large detour path along the vicinity of the inner peripheral wall of the hot water storage tank from one convection space A (B) to the other convection space B (A) via the upper and lower partition structures 20 In addition to the convection, the convection in the hot water storage tank is also convected in the vertical direction through the communication opening 25 formed in each flow path of the partition structure 20, so that the water and hot water in the hot water storage tank Overall convection can be achieved. Therefore, a limited convection space between both end portions of the honeycomb body 51 and both end wall portions of the hot water storage tank 50 provided in the hot water storage tank when the heater in the hot water storage tank is heated, as in a conventional hot water storage type electric water heater. When water and hot water in the hot water storage tank are convected only by convection in X and Y (see FIG. 14) and a large convection along the vicinity of the inner peripheral wall of the hot water storage tank through the space X and space Y and the upper and lower honeycomb flow paths. Compared with, the boiling of water and hot water in the hot water storage tank can be greatly improved.

  Note that the communication opening 25 of the partition structure 20 may be a notch that partially extends from the end of the partition structure 20 to the inside in the longitudinal direction, and the communication opening of the present embodiment. Instead of having a rectangular shape such as 25, it may have a shape such as a long hole.

  Further, a communication opening may be provided over the entire longitudinal direction of the partition structure 20. If a communication opening is provided over the entire longitudinal direction of the partition structure 20, it is difficult to integrate the partition structure structurally. In this case, special support is provided for both ends of the partition structure in the longitudinal direction or in the vicinity thereof. This can be solved by supporting the inner peripheral wall of the hot water storage tank through the body. By using such a support, the handling at the time of assembling the partition structure to the hot water storage tank can be improved.

  In addition, in the above-mentioned embodiment, when assembling the partition structure 20 in which a plurality of horizontal plates 21 and vertical plates 22 are arranged in a lattice shape in an end view, a plate having a communication opening 25 and a communication opening 25 are provided in advance. It is also possible to make separate plates as separate bodies and combine them in the state where they are arranged vertically and horizontally to form the entire partition structure. By such an assembling method, the assembling property of the partition structure 20 is improved and the manufacturing cost is reduced.

  In addition, the communication opening 25 provided in the partition structure 20 is not necessarily provided in each flow path, and may be provided in a part of the flow paths. Further, only one communication opening 25 may be provided in each flow path, but at least two communication openings 25 are provided in the vertical direction through the communication openings 25 at positions spaced from each flow path. The convection of the water becomes even more complicated, and the portion where water or lukewarm water stagnates in the hot water storage tank can be reduced, and the boiling property of water or lukewarm water is improved.

  Subsequently, various modifications of the hot water storage type electric water heater according to the above-described embodiment will be described. In addition, about the structure equivalent to embodiment mentioned above, a corresponding code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIG. 4, the first modified example of the above-described embodiment has a notch 120 a (notch 120 a () along a part in the longitudinal direction of the circumferential surface instead of each partition structure 20 provided in the hot water storage tank 10 described above. A plurality of cylindrical partition structures 120 (121 to 126) made of a cylindrical body having 121 a to 126 a) are accommodated in the hot water storage tank 110. Each cylindrical partition structure 120 is fixed by welding or the like so that adjacent cylindrical partition structures are in contact with each other in the circumferential direction, and the outer cylindrical partition structure is in contact with the inner peripheral wall of the hot water storage tank 110. It is fixed by welding or the like and accommodated in a hot water storage tank. Accordingly, each cylindrical partition structure 120 forms a narrow passage having a small cross-sectional area, and the gap between the inner peripheral wall of the hot water storage tank 110 and each cylindrical partition structure 120 also serves as a flow path. It is like that. In addition, the notch 120a (121a-126a) formed in each cylindrical partition structure 120 is partially formed over an appropriate length at an appropriate place in the longitudinal direction.

  And by forming such a notch 120a in each cylindrical partition structure 120 in the hot water storage tank, a clearance between the cylindrical partition structures or a clearance between the cylindrical partition structure 120 and the inner peripheral wall of the hot water storage tank. The hot water heated by the heater 130 flows into the cylindrical partition structures through the notches 120a (121a to 126a) from the extruded convection space formed in the water, and the water and temperature in the cylindrical partition structures Relatively low-temperature warm water flows out through the notches 120a (121a to 126a) into the space for extrusion convection formed in the gap between the cylindrical partition structures or the gap between the cylindrical partition structure 120 and the inner peripheral wall of the hot water storage tank. .

  As a result, during the boiling of the hot water storage type electric water heater, the vertical convection of water and hot water in the hot water storage tank is caused between the cylindrical partition structures or between the cylindrical partition structure and the clearance between the hot water storage tank inner peripheral wall. Proactively generate. Therefore, in addition to the convection spaces A and B shown in FIG. 1 in the hot water storage tank, in addition to the convection space A (B), the other convection space B ( A large detour path along the vicinity of the inner peripheral wall of the hot water storage tank leading to A), and the water or hot water in the hot water storage tank are entirely contained in the tank through notches 120a formed at appropriate positions of the cylindrical partition structures 120. It is designed to convect.

  In addition, it is not necessary to form such a notch 120a in all the cylindrical partition structures 120, and at least one notch 120a may be formed in the cylindrical partition structure 120. Even in this case, water or hot water is notched between the cylindrical partition structure provided with the notch 120a and the gap between the cylindrical partition structure adjacent to the notch 120a and the inner peripheral surface of the hot water storage tank. Convection according to the width and length of the. That is, the convection effect of water or hot water in the hot water storage tank can be improved according to the degree of formation of the notch 120a.

  Moreover, you may form such a notch 120a over the full length of each cylindrical partition structure 120. FIG. In this case, if each cylindrical partition structure 120 is in contact with the peripheral surfaces where the notches 120a are not formed, or is in contact with the peripheral surface where the notches 120a are not formed and the inner surface of the hot water storage tank, In the embodiment described above, it is not necessary to support these cylindrical partition structures 120 with a special support as in the case where openings are formed in the respective flow paths of the partition structure 20 over the entire longitudinal direction.

  When the notches 120a are formed over the entire length of each cylindrical partition structure 120, water and hot water inside and outside the cylindrical partition structure communicate with each other through the notches 120a. Therefore, although the pushability of hot water in the hot water storage tank is slightly reduced as compared with the case where the notch 120a is formed in a part of the longitudinal direction of each cylindrical partition structure 120, the convection effect of the water and hot water in the hot water storage tank is slightly reduced. As for it can be increased considerably.

  In this first modification, the size and length of the notches 120a formed in each cylindrical partition structure 120 and the notches 120a are formed in a part of the cylindrical partition structure 120 in the hot water storage tank, or Whether to form such a notch 120a in all the cylindrical partition structures 120 depends on the specifications of the hot water push-out property and the boiling-up property in the hot water storage tank for the hot water storage type electric water heater equipped with the notch 120a. What is necessary is just to determine suitably.

  As another modification of the first modification, a modification as shown in FIG. 5 can be considered. This another modification is provided with a cylindrical partition structure 150 (151 to 154) having a larger inner diameter and outer diameter than the cylindrical partition structure 120 (121 to 126) according to the first modification in the hot water storage tank. The interior of each cylindrical partition structure 150 is partitioned by a partition plate 160 (161 to 164) and divided into a plurality of flow paths (in the present modification, each cylindrical partition structure is divided into four flow paths). Yes. Further, notches 150a (151a to 154a) equivalent to those of the first modification are formed on the outer peripheral portion of each cylindrical partition structure 150, and each rectangular partition 160 has a rectangular communication opening 160a (161a). 164a) are formed.

  In this manner, the inside of each cylindrical partition structure 150 is further divided into a plurality of flow paths by the partition plate 160, so that the function of the above-described first modified example is similarly exhibited, and in the hot water storage tank. A large number of flow paths can be formed in the hot water storage tank while reducing the total number of cylindrical partition structures to be accommodated, which makes it possible to reduce the number of steps for assembling the hot water storage tank.

  Then, the 2nd modification of embodiment mentioned above is demonstrated. This second modification is a further modification of the first modification shown in FIG. 4, and as shown in FIG. 6, a cylinder having the same basic configuration as that of the first modification shown in FIG. Although the cylindrical partition structures 220 (notches corresponding to the first modification are not shown) are different from the cylindrical partition structures 220 shown in FIG. 4, the cylindrical partition structures 220 (in FIG. 6). End openings 220a (221a to 223a) of the cylindrical partition structures 221 to 223 open downward from the horizontal direction in the installed state of the hot water storage type electric water heater, and each end of each partition structure 220 The upper end opening part 221a (222a) of the part opening part 220a protrudes to the longitudinal direction end part side (right side in FIG. 4) of the hot water storage tank from the lower end opening part 222a (223a). This cylindrical partition structure 220 is a hot water storage tank. It is accommodated in the click.

  Since each cylindrical partition structure 220 in the hot water storage tank has such a configuration, the upward flow of hot water in the hot water storage tank can be guided to each cylindrical partition structure without any problem, and the water in the entire hot water storage tank can be guided. It can boil hot water efficiently with a simple structure. In particular, when the end of the heater is arranged below the end opening 220a, the rising flow of the hot water heated by the heater is just at each opening 220a as shown by the arrow in FIG. Since it flows in the shortest distance, the convection effect becomes large.

  In this case, of the configuration in which the end opening 220a on the heater installation side of the cylindrical partition structure 220 is opened downward from the horizontal direction, and the end opening 220a of each cylindrical partition structure 220 The upper end opening 221a (222a) does not necessarily satisfy both of the configurations in which the upper end opening 222a (223a) protrudes toward the longitudinal end of the hot water storage tank, If either one of the configurations is satisfied, it is possible to improve the boiling property of water and hot water in the hot water storage tank.

  Moreover, although this 2nd modification was introduce | transduced as a further modification of the 1st modification mentioned above, it is not necessarily limited to this, One Embodiment of this invention formed in the grid | lattice form by the end surface view of a hot water storage tank The heater installation side end of the partition structure 10 may be modified so as to correspond to FIG. It goes without saying that the same operational effects as those of the second modification can also be exhibited by this.

  Further, as a further modification of the second modification, a modification as shown in FIG. 7 can be considered. This further modified example is a projecting portion of the cylindrical partition structure 230 in addition to the end opening 230a (231a to 233a) of each cylindrical partition structure 230 (only the partition pipes 231 to 233 are shown in FIG. 7). A convection promoting opening 230b (231b to 233b) is provided on the lower side. And the hot water which rose by natural convection in the hot water storage tank flows into the cylindrical partition structure through this convection promoting opening 230b.

  Since each cylindrical partition structure has such a structure, the upward flow of hot water in the hot water storage tank can be actively guided into each cylindrical partition structure in the same manner as in the second modification described above. (See the arrows in FIG. 7) Water and hot water in the entire hot water storage tank can be boiled more efficiently with a simple structure.

  Then, the 3rd modification of embodiment mentioned above is demonstrated. This 3rd modification is a further modification of the 1st modification, and as shown in FIG. 8, the hot water storage type electric water heater is a to-be-attached object, for example, the counter lower surface of a toilet room or the kitchen counter's crack part. The hot water storage part 312 of the hot water storage tank 310 is positioned higher than the incoming water part 311 and the lower surface 310a in the vicinity of the incoming water part of the hot water storage tank 310 is lower than the lower surface 310b in the vicinity of the hot water supply part. It is supposed to be.

  In the case of a so-called horizontal hot water storage type electric water heater, since the whole is a flat type, the water that has entered from the water inlet 311 easily spreads over the entire bottom surface of the hot water storage tank. However, when the hot water storage tank 310 has such a structure, when the water or hot water in the hot water storage tank convects, the upper part of the hot water storage tank is different in specific gravity. Only hot water that constantly rises toward the hot water can be reliably guided to the hot water outlet 312, and the pushability of hot water in the hot water storage tank is further improved.

  In this modified example, as shown in FIG. 9A, the hot water storage tank 310 is installed in a state where the hot water storage tank 310 is inclined so that the end of the hot water storage section 310 is higher than the end of the incoming water section. However, it is not always necessary to install the hot water storage tank 310 in such an inclined manner. Specifically, as shown in FIG. 9B, the hot water storage tank itself is not inclined, but the lower surface 320a of the hot water storage tank 320 in the vicinity of the water inlet 321 is lower than the lower surface 320b of the hot water outlet 322 in the vicinity. In addition, only the lower surface of the hot water storage tank 320 may have a tapered surface that goes downward as it goes toward the water inlet. In this case, the entire lower surface of the hot water storage tank 320 may have a gentle step instead of forming a tapered surface, and the lower surface near the water inlet may be lower than the lower surface near the hot water outlet.

  Subsequently, a fourth modification and a fifth modification of the above-described embodiment will be described. This 4th modification and the 5th modification are modifications of the form in which the hot water storage type electric water heater accommodates a plurality of hot water storage tanks instead of housing a single hot water storage tank in its casing. In the fourth modification, the hot water storage tanks 410, 420, 430 are arranged in parallel in the horizontal direction as shown in FIG. 10 with the hot water storage type electric water heater installed, and the connecting pipes 401, 402, 411, 421 are connected. 431 are connected in parallel with each other via 431. Similarly, in the fifth modification of the embodiment described above, the hot water storage tanks 510, 520, 530 are arranged in parallel in the vertical direction as shown in FIG. It has the structure connected mutually in parallel via 511,521,531.

  By providing a plurality of hot water storage tanks and connecting them in parallel via connecting pipes, it is possible to increase the flexibility of the overall shape of the hot water type electric water heater while increasing the hot water storage capacity of the hot water type electric water heater. It is possible to install a hot water storage type electric water heater having a larger hot water storage capacity in a desired space while effectively utilizing the limited installation space such as the lower surface of the toilet room or the kitchen counter.

  Unlike these fourth and fifth modifications, a hot water storage type electric water heater accommodated in a casing in a state in which a plurality of hot water storage tanks are arranged in this manner and connected in series via a connecting pipe. The same effect can be achieved with this configuration. That is, as shown in FIG. 12, when hot water storage tanks 410, 420, and 430 are connected in series by connecting pipes 403, 404, 405, and 406, respectively, when hot water storage tanks are connected in parallel by connecting pipes as described above. Compared to the above, since the flow rate of water flowing into each hot water storage tank is increased, hot water is less likely to be mixed during extrusion, and the pushability is improved.

  In addition, in the above-mentioned embodiment and its various modifications, the heater does not need to extend over the whole longitudinal direction of a hot water storage tank. In other words, the hot water storage tank may be provided in the hot water storage tank so as to be biased to either the water inlet side or the hot water outlet side.

  Further, the heater is not limited to the elongated cylindrical heater as shown in the above-described embodiment and its various modifications. For example, a nichrome wire as a heating element is completely made of a resin excellent in waterproofness and heat resistance. Is inserted into one end of the hot water storage tank and bent into a U shape near the other end using a so-called sheath heater that is surrounded by a metal sheath (sheath tube). It may be led out from one end to the outside again.

  In addition, the heater is not necessarily provided inside the hot water storage tank, and for example, a plate-like heater may be provided in direct contact with the outside of the hot water storage tank. In this case, in order to eliminate the so-called dead water volume in the hot water storage tank, it is preferable to provide a heater on the bottom surface of the hot water storage tank with the hot water storage type electric water heater installed.

  In addition, the hot water outlet of the hot water storage tank may be provided at any location on one side end of the hot water storage tank, but if the hot water storage type electric water heater is installed above the one side end of the hot water storage tank, the hot water may be provided. Can be pushed out more.

  Further, in the above-described embodiment and various modifications thereof, all the hot water storage tanks have a cylindrical shape with both ends closed. Although the hot water storage tank has a cylindrical shape, pressure resistance can be increased. However, the hot water storage tank is not limited to such a shape, and for example, the hot water storage tank may be configured in a rectangular parallelepiped shape. In this way, for example, by forming the hot water storage tank in a rectangular parallelepiped shape, when the hot water storage tank is generally housed in a box-shaped housing, the hot water storage tank is housed without causing a dead space inside the housing. Therefore, the hot water storage capacity can be increased while downsizing the entire hot water storage type electric water heater.

  As described above, a horizontal storage type hot water storage tank is provided to install the hot water storage type electric water heater in a narrow space, and the hot water extrusion efficiency is improved. It has been considered that a honeycomb body having an elongated gap is provided to reduce the cross-sectional area of each flow path so that the hot water is pushed out without being mixed with the hot water at the time of water supply. However, in this conventional technology, when a heater for boiling water is installed outside the hot water storage tank and circulated by a circulation pump and a circulation pipe, the entire system of the hot water storage type electric water heater becomes complicated and large and expensive. It becomes something. Further, when the heater is provided in the hot water storage tank in this prior art, the vertical convection is restricted by the honeycomb body, and water and hot water in the hot water storage tank cannot be efficiently boiled.

  On the other hand, in the case of the hot water storage type electric water heater according to this embodiment, since the heater is provided in the hot water storage tank, the entire hot water storage type electric water heater can be miniaturized, and the hot water storage type electric water heater is installed horizontally. Even if it is a formula, a plurality of independent flow paths are formed by the partition structure, and the cross-sectional area of each flow path is reduced, so that the hot water pushability of the hot water storage tank is improved.

  Further, by providing the partition structure with an opening through which at least a part of the adjacent flow paths communicates, convection of water or hot water occurs between these flow paths, and the flow flows as compared with the case where there is no communication opening. Disturbance occurs, resulting in a three-dimensional complex convection. As a result, heat transfer from the flow path close to the heater to the flow path away from the heater is performed more smoothly, and water and warm water in the hot water storage tank can be efficiently boiled.

  Further, in the flow path in which the communication opening is formed, the communication opening is formed in a part of the flow path or over the entire flow path, so that the pushability of hot water in the hot water storage tank is increased. The superiority or inferiority of the boiling property of water or hot water can be appropriately changed according to the specifications of the hot water storage type electric water heater.

  In addition, by providing two or more communication openings in the flow path in which the communication openings are formed, the convection in the vertical direction is further complicated through the communication openings, and water and warm water stagnate in the hot water storage tank. The number of parts can be reduced and the boiling property of water and lukewarm water is improved.

  In addition, by providing a communication opening in each flow path of the partition structure, inflow and outflow of water and lukewarm water into the communication opening, the vicinity of the inflow part, the vicinity of the outflow part, and the upper and lower sides of the partition structure The convection of a large detour path along the vicinity of the inner peripheral wall of the hot water storage tank via the flow path is also promoted. Thus, by causing convection of water and hot water in the entire hot water storage tank, the water and warm water in the hot water storage tank can be boiled more efficiently.

  In addition, the end opening of each flow path formed by the partition structure opens downward from the horizontal direction in the installed state of the hot water storage type electric water heater, thereby partitioning the upward flow of hot water in the hot water storage tank. It can be actively guided into each flow path formed by the structure, and water and hot water in the entire hot water storage tank can be heated more efficiently with a simple structure.

  Further, among the end openings of each flow path formed by the partition structure, the upper end opening in the installed state of the hot water storage type electric water heater protrudes in the horizontal direction from the lower end opening. As a result, the upward flow of hot water in the hot water storage tank can be guided more actively into each flow path formed by the partition structure, and the entire hot water and hot water in the hot water storage tank can be easily Boiled more efficiently with the structure.

  Also, by having an opening for convection promotion below the portion of each flow path formed by the partition structure projecting in the horizontal direction, the upward flow of hot water in the hot water storage tank is more actively introduced into each flow path. It can be guided without hesitation, and water in the entire hot water storage tank and lukewarm water can be boiled more efficiently with a simple structure.

  Also, because the heater is installed below the partition structure in the installed state of the hot water storage type electric water heater, it is left below the heater in the hot water storage tank called so-called dead water and left in convection. The capacity of water that is difficult to boil can be reduced, and water and hot water in the hot water storage tank can be boiled more efficiently.

  In addition, in the case of a so-called horizontal hot water storage type electric water heater, since the whole is a flat type, the water that has entered from the water inlet easily spreads over the entire bottom surface of the hot water storage tank. There is a risk that the water will reach and mix with the hot water from the hot water outlet, but the hot water storage tank is equipped with a hot water storage tank so that the hot water storage tank is located lower than the hot water outlet when the hot water storage type electric water heater is installed. Because the lower surface on the side is lower than the lower surface on the hot water side, the hot water that constantly rises toward the upper part of the hot water tank due to the difference in specific gravity when water or hot water in the hot water tank convects. The hot water push-out performance in the hot water storage tank is further improved.

  In addition, by providing a plurality of the hot water storage tanks and connecting the hot water storage tanks in series or in parallel with each other via a connecting pipe, the hot water storage capacity can be increased while increasing the flexibility of the overall shape of the hot water storage type electric water heater. A hot water storage type electric water heater having a larger hot water storage capacity can be installed in a limited installation space of the hot water storage type electric water heater. Note that when a plurality of hot water storage tanks are connected in series with a connecting pipe, the flow velocity is faster than when connected in parallel, so that hot water is less likely to be mixed during hot water extrusion, and pushability is improved.

It is sectional drawing which shows schematically the hot water storage tank of the hot water storage type electric water heater which concerns on one Embodiment of this invention with the internal structure. It is the perspective view seen from the hot water part side diagonally upper direction except the hot water side end part of the hot water storage tank shown in FIG. It is a schematic sectional drawing which shows the state which cut | disconnected the hot water storage tank shown in FIG. 1 perpendicularly | vertically with the tank center axis line in the position containing the communication opening part of the edge part of each partition structure. It is the schematic sectional drawing cut | disconnected perpendicularly | vertically to the tank center axis line in the edge part of each cylindrical partition structure in the 1st modification of the hot water storage type hot water storage tank shown in FIG. FIG. 5 is a schematic cross-sectional view showing another modification of the first modification shown in FIG. 4 corresponding to FIG. 4. It is a schematic side view which shows partially the 2nd modification of the hot water storage tank shown in FIG. 1 with the effect | action. It is a schematic side view which shows the further modification of the 2nd modification of the hot water storage tank shown in FIG. 4 corresponding to FIG. FIG. 7 is a schematic cross-sectional view corresponding to FIG. 1 showing a third modification of the hot water storage tank shown in FIG. 1. FIG. 9 is a schematic side view of the third modification shown in FIG. 8 (FIG. 9A) and a schematic side view of the further modification (FIG. 9B). It is a schematic perspective view which shows the 4th modification of the hot water storage tank shown in FIG. It is a schematic perspective view which shows the 5th modification of the hot water storage tank shown in FIG. It is a schematic perspective view which shows the further modification of the 4th modification of the hot water storage tank shown in FIG. It is explanatory drawing which shows roughly an example of the installation state of a horizontal installation type hot water storage type electric water heater. It is a schematic sectional drawing which shows an example of the structure of the hot water storage tank with which the conventional hot water storage type electric water heater is equipped corresponding to FIG. It is a whole block diagram which shows schematically the structure of the conventional hot water storage type electric water heater relevant to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hot water storage type electric water heater 10 Hot water storage tank 11 Inlet part 12 Outlet part 20 Partition structure 21 Horizontal plate 22 Vertical plate 25 Communication opening part 30 Heater 50 Hot water storage tank 50a, 50b End wall part 51 Honeycomb body 51a, 51b End part 53 Hot water outlet Part 60 Heater 61 Circulation pump 62, 63 Circulation pipe 110 Hot water storage tank 120 (121-126) Cylindrical partition structure 120a (121a-126a) Notch 130 Heater 150 (151-154) Cylindrical partition structure 150a (151a- 154a) Notch 160 (161 to 164) Partition plate 160a (161a to 164a) Communication opening 220 (221 to 223) Partition structure 220a (221a to 223a) End opening 230 (231 to 233) Cylindrical partition structure Body 230a (231a-233 ) End opening 230b (231b to 233b) Convection promoting opening 310 Hot water storage tank 310a Water inlet side end 310b Hot water outlet side end 311 Water inlet 312 Hot water outlet 320 Hot water storage tank 320a, 320b Lower surface 321 Water inlet 322 401-406 Connection pipes 410, 420, 430 Hot water storage tanks 411, 421, 431 Connection pipes 501, 502 Connection pipes 510, 520, 530 Hot water storage tanks 511, 521, 531 Connection pipes A, B, X, Y Convection space

Claims (10)

A hot water storage tank, a water inlet section provided at a predetermined position of the hot water storage tank, a hot water outlet section provided at a position different from the water inlet section of the hot water storage tank, and from the vicinity of the water inlet section in the hot water storage tank to the vicinity of the hot water outlet section. A hot water storage type electric water heater having a partition structure provided so as to form a plurality of flow paths, wherein the hot water storage type electric water heater is installed from the height in the vertical direction of the hot water storage tank. In the hot water storage type electric water heater equipped with the hot water storage tank so that the length in the lateral direction becomes longer,
The hot water storage type electric water heater is characterized in that a communication opening is provided in the partition structure so that at least a part of the adjacent flow paths communicate with each other.   In the flow path in which the communication opening is formed, the communication opening is formed in a part of the flow path or over the entire flow path. The hot water storage type electric water heater described.   The hot water storage type electric water heater according to claim 1 or 2, wherein two or more communication openings are provided in the flow path in which the communication opening is formed.   4. The communication channel according to claim 1, wherein all the flow paths in the hot water storage tank communicate with each other by providing the communication openings in the flow paths of the partition structure. 5. Hot water type electric water heater.   The end opening of each flow path formed by the partition structure opens downward from the horizontal direction in the installed state of the hot water storage type electric water heater, and the hot water rising by natural convection in the hot water storage tank is at the end. The hot water storage type electric water heater according to any one of claims 1 to 4, wherein the hot water storage type electric water heater is configured to flow into each of the flow paths through a portion opening.   Of the end openings of each flow path formed by the partition structure, the upper end opening in the installed state of the hot water storage type electric water heater protrudes in the horizontal direction from the lower end opening. The hot water storage type electric water heater according to any one of claims 1 to 5, wherein   In addition to the opening at the end of each flow path formed by the partition structure, an opening for convection promotion is provided below the portion projecting in the horizontal direction of each flow path, and natural convection is provided in the hot water storage tank. The hot water storage type electric water heater according to claim 6, wherein the hot water that has been raised by the air flows into the respective flow paths through the convection promoting opening.   The hot water storage type electric hot water according to any one of claims 1 to 6, wherein the heater is installed below the partition structure in a state where the hot water storage type electric water heater is installed. vessel.   The hot water storage tank is provided with the hot water storage tank so that the water inlet is positioned lower than the hot water outlet in the installed state of the hot water storage type electric water heater, and the lower surface of the hot water storage tank is lower than the lower surface of the hot water outlet. The hot water storage type electric water heater according to any one of claims 1 to 8, wherein the hot water storage type electric water heater is lowered. The hot water storage type electric water heater according to any one of claims 1 to 9, wherein a plurality of the hot water storage tanks are provided, and the hot water storage tanks are connected to each other in series or in parallel via a connecting pipe.

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