JPH0882442A - Rapid heating multi-tube electric water heater and its extension method - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an electric water heater with less restrictions on the installation location. [Structure] Separation plate 6 that divides the tank into an upper hot water storage portion 1A and a lower heating portion 1B, and a heater 5 provided in the heating portion 1B.
And a heating tank 1 consisting of and one or more hot water storage tanks 81,8 installed next to each other.
2, and a hot water supply connection pipe 25 that communicates with each other above the hot water storage portion 1A of the heating tank 1 and above the hot water storage tanks 81 and 82,
A water supply connecting pipe 24 that communicates with each other under the heating part 1B of the heating tank 1 and under each hot water storage tank, and a lower part that connects the lower part of the hot water storage part 1A of the heating tank 1 with the lower part of the hot water storage tanks 81, 82. The balance pipe 26, a lower balance pipe 27 that communicates the lower portions of the hot water storage tanks 81 and 82 with each other, an upper balance pipe 28 that passes above the hot water storage portion 1A of the heating tank 1 and above the hot water storage tank, and each hot water storage liquid It consists of an upper balance pipe 29 that passes above the tanks 81, 82.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rapid heating multi-tube electric water heater and a method for adding the same. More specifically, the present invention relates to an electric water heater that is widely used for homes and businesses and an extension method for increasing the capacity thereof.

[0002]

2. Description of the Related Art A conventional electric water heater is provided with a heater at a lower portion of a hot water storage tank, a water supply pipe is connected below the hot water storage tank to supply water, and a hot water supply pipe is connected above the hot water storage tank. It is configured to extract boiling water.

[0003]

However, in the above-mentioned conventional electric water heater, since the entire water in the hot water storage tank is always heated by the heater, the heating time until it becomes hot water is long, and once the hot water is used up There was a problem that it took a long time to boil and extract. From a user's standpoint, needless to say, it is convenient and convenient if it has an immediate heating function for extracting hot water in a short time even after hot water is exhausted. However, the electric water heaters currently on the market have almost no immediate heating function. In addition, the conventional electric water heater uses a cylindrical tank that is a pressure container to store hot water, but since the diameter of each of these tanks increases as the capacity increases, there is a problem that the installation location is restricted. In addition, there is a problem that the entire electric water heater must be replaced when measuring the amount of hot water to be stored.

Therefore, an object of the present invention is to provide an electric water heater which can take out hot water at any time, can take out hot water in a short time even after the hot water has run out, and is not restricted in the place of installation. Another object of the present invention is to provide an extension method for easily increasing the capacity of the electric water heater after installation.

[0005]

The present invention (Claim 1) includes:
A separation plate that divides the vertically long tank into an upper hot water storage section and a lower heating section, a heater provided in the heating section, and a hot water guide that sends the hot water boiled in the heating section upward in the hot water storage section. A heating tank consisting of a pipe and a temperature-sensing on-off valve that opens when the temperature of the hot water in the heating section interposed in the guide pipe reaches a predetermined temperature, and closes at a temperature below the predetermined temperature; One or two or more hot water storage tanks installed side by side next to the tank, a hot water supply connection pipe communicating with each other above the hot water storage part of the heating tank and above each hot water storage tank, and the hot water supply connection pipe It is characterized in that it comprises a hot water supply pipe, a water supply connecting pipe communicating below the heating part of the heating tank and below each hot water storage tank, and a water supplying pipe connected to the water supply connecting pipe. In the present invention, the temperature sensing on-off valve (hereinafter referred to as the on-off valve) may be attached to the open end of the molten metal pipe in the heating part of the heating tank, or may be directly attached to the separation plate and the molten metal pipe may be attached to the separation plate. May be attached. Further, it may be attached in the middle of the molten metal pipe in the hot water storage portion, or may be attached to the tip opening portion of the molten metal pipe. In any case, it suffices that the hot water in the heating tank reaches a predetermined temperature, the on-off valve is opened, and the hot water in the heating section passes through the inside of the hot water pipe and is fed to the upper part of the hot water storage section. The on-off valve according to the present invention means an on-off valve that opens when the temperature in the heating unit reaches a predetermined temperature (for example, 90 degrees) and closes when the temperature is below the predetermined temperature. A preferred embodiment of the present invention (claim 2) is a lower balance pipe that communicates between a lower portion of the hot water storage portion of the heating tank and a lower portion of the hot water storage tank, and a lower balance pipe that communicates between lower portions of the respective hot water storage tanks. According to another preferred embodiment (claim 3), the upper balance pipe communicating between the hot water storage part of the heating tank and the hot water storage tank, and the upper parts of the hot water storage tanks are communicated with each other. The upper balance tube is provided. The lower balance pipe and the upper balance pipe may be used individually, but it is most preferable to use both in combination. Further, as a further preferred embodiment (Claim 4) in which an upper balance pipe is provided, when the hot water temperature is equal to or higher than a predetermined temperature, the hot water supply port of the hot water storage part of the heating tank and each hot water supply port of the hot water storage tank are opened. It is to install an on-off valve that closes the valve at a predetermined temperature or below.

[0006] According to the expansion method (Claim 5) of the present invention, in the quick-heat multi-tubular electric water heater according to Claim 1, one or more hot water storage tanks are provided in a lateral space adjacent to the hot water storage tank. And the hot water supply connection pipe is extended and connected to an upper part of the added hot water storage tank, and the water supply connection pipe is extended and connected to a lower part of the added hot water storage tank. In the above addition method, further, in the electric water heater having a lower balance pipe and / or an upper balance pipe, a lower balance pipe and / or an upper portion between the expanded hot water storage tank and the existing hot water storage tank. A method of connecting a balance pipe (claim 6) is preferred. In addition, instead of or in addition to the expansion method, a method of changing an existing hot water storage tank to one having a larger capacity (claim 7)
Is also preferable.

[0007]

In the present invention, when water is boiled into hot water by the heater in the heating section of the heating tank, the temperature sensing on-off valve is opened, and the hot water is sent to the hot water storage section through the hot water pipe and stored therein. Hot water is also sent to the hot water storage tank through the hot water supply connection pipe and the upper balance pipe. When this operation is repeated, hot water is sequentially stored from above in all of the hot water storage section of the heating tank and the hot water storage tank. Even if hot water and water are present in the hot water storage tank at the same time, they are separated from each other by the specific gravity difference (density difference) of the hot water and water, and the hot water is always located above, so when you open the hot water tap, Only hot water can be extracted. Therefore, in the present invention, the hot water can be taken out at any time, and the boiling time of the hot water is short and the hot water can be supplied in a short time. Further, in the present invention, since the vertically long heating tank and one or more vertically long hot water storage tanks are arranged side by side in the lateral direction, the thickness of the electric water heater as a whole is reduced, and the installation location is less restricted. However, there is an advantage that it can be installed in a narrow place.

According to the expansion method of the present invention, when it is desired to increase the amount of hot water stored after it has been installed once, a new hot water storage tank is installed beside the existing hot water storage tank, and a hot water supply connecting pipe or a water supply connecting pipe is installed. Moreover, since it is sufficient to connect the lower balance pipe and the upper balance pipe, it is possible to add more by simple construction. Further, instead of the addition method of the present invention, or in addition to this, the existing hot-water storage tank may be changed to a large-sized tank, so that the addition can be easily performed.

[0009]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is an explanatory view of an electric water heater according to an embodiment of the present invention. In FIG. 1, 1 is a heating tank,
Reference numeral 82 is a hot water storage tank. Both the heating tank 1 and the hot water storage tanks 81 and 82 are vertically long cylindrical pressure vessels, and the hot water storage tanks 81 and 82 are installed side by side on the heating tank 1. Although the number of hot water storage tanks 81 and 82 is two in the illustrated example, it may be one or three or more. The hot water storage tanks 81 and 82 may be installed not only on one side of the heating tank 1 but also on both sides thereof. The heating tank 1 and the hot water storage tanks 81 and 82 are covered with the heat insulating material 2, and the outer plate 3
Housed within.

Although details of the heating tank 1 will be described later, the heating tank 1 is divided into upper and lower parts by a separating plate 6, and an upper part is a hot water storage part 1A and a lower part is a heating part 1B. A water supply pipe 13 is connected to a water supply port 17 formed at the bottom of the heating unit 1B of the heating tank 1,
A pressure reducing valve 14 is provided at 13 for supplying water at a pressure lower than the water pressure of the water pipe when the water is supplied by connecting to the water pipe. A hot water supply pipe 15 is connected to a hot water supply port 23 formed in the upper part of the heating tank 1, and a hot water supply plug 16 is interposed in the hot water supply pipe 15. A relief valve 38 is attached to the upper end of the hot water supply pipe 15. The relief valve 38 is a pressure control valve for keeping the pressure in the tank at a predetermined value or less, for example, 1 kg / cm 2 or less.

A water supply connection pipe 24 is connected to the water supply pipe 13, and the water supply connection pipe 24 is connected to the water supply ports 17 below the hot water storage tanks 81 and 82, respectively. Further, a rectifier 18 that moderates the water supply flow is installed immediately above the water supply port 17 of each hot water storage tank 81, 82. And the hot water supply pipe 15
A hot water supply connection pipe 25 is connected to the hot water supply connection pipe 25, and the hot water supply connection pipe 25 is connected to the hot water supply port 23 above each of the hot water storage tanks 81 and 82.

Next, the details of the heating tank 1 are shown in FIG.
It will be explained based on. The heating tank 1 is a cylindrical pressure vessel, and a separating plate 6 is provided midway in the vertical direction of the heating tank 1.
Is used to separate the hot water storage section 1A and the heating section 1B. Heating part 1B
A heater 5 for heating the water in the heating unit 1B is arranged therein, and a water supply pipe 17 for water supply is connected to the water supply port 17 at the bottom as described above. Lower part in hot water storage section 1A and heating section 1B
A water guiding pipe 7 is arranged between the lower part of the heating unit 1B and the lower part of the heating unit 1B, and the upper end of the water guiding pipe 7 is connected to the separation plate 6 by forming an opening, and the lower end is located near the bottom of the heating unit 1B. In addition, although the lower end port forms the rectifier 7a with the widened skirt for rectifying the supplied water, the rectifier 7a may be omitted.
In addition, a rectifier 18 is installed above the water conduit 7 to slow down the flow of water supplied to the hot water storage portion 1A. Cold water is exchanged between the hot water storage portion 1A and the heating portion 1B by the water conduit 7.

The separating plate 6 is joined to a hot water pipe 10 for feeding the hot water in the heating portion 1B above the hot water storage portion 1A, and extends to near the zenith portion of the hot water storage portion 1A. A hot water supply port 23 is formed at the zenith of the hot water storage unit 1A, and a hot water supply pipe 15 is connected to the hot water supply port 23 so that the hot water of the hot water storage unit 1A can be supplied to a hot water tap 16. Further, the lower end portion of the molten metal pipe 10 projects from the separating plate 6 toward the heating portion 1B, and an opening / closing valve 11 is attached to the lower end thereof. The opening / closing valve 11 may be attached to the separating plate 6 and the molten metal pipe 10 may be attached to the separating plate 6. In any case, open / close valve
It must be configured so that hot water is delivered to the conduit 10 through 11. The open / close valve 11 is a control valve that senses the temperature of the hot water in the heating unit 1B, opens at a predetermined temperature (for example, 90 degrees), and closes at a temperature lower than that.

Although not shown in detail in FIG. 6, an air vent hole 50 is formed in the mounting flange of the opening / closing valve 11 or in the side wall of the pipe 10 slightly above, so that the heating existing before the initial water supply is performed. The air in the part 1B is drained when supplying water, and the air dissolved in the water that separates from the water during heating is drained to prevent emptying in the heating part 1B. Preferably. As a result of providing the air vent hole 50, the air vent hole 50 provided on the lower surface of the separation plate 6 and the mounting flange of the on-off valve 11 or the side wall of the pipe 10 slightly above.
The space between and has an air reservoir 30 for insulating the air. Although not shown, a thermostat and an earth leakage circuit breaker are attached so that temperature control and safety are maintained.

Next, the boiling operation of the hot water in the heating tank 1 will be described with reference to FIG. First, the water supplied from the water supply port 17 through the water supply pipe 13 enters the heating section 1B,
When the water surface rises to Wa, it becomes full. The position of the symbol Wa is the mounting flange of the on-off valve 11 or the pipe 10 slightly above.
This is the position of the air vent hole 50 provided on the side wall of the. An air reservoir 30 is formed between the water surface Wa and the separation plate 6 to form an air heat insulating layer between the heating portion 1B and the hot water storage portion 1A. At the same time that water is supplied to the heating unit 1B, the water passes through the water conduit 7 and is rectified by the rectifier 18 to enter the hot water storage unit 1A, and the air that was present when it was empty escapes from the hot water supply pipe 15 and eventually stores hot water. Part 1A is filled with water, both heating part 1B and hot water storage part 1A, that is, heating tank 1
The whole is full. After that, when electricity is applied, the heater 5 heats the water in the heating unit 1B. Since the heating unit 1B is kept warm by a heat insulating material around the heating unit 1A and is insulated from the hot water storage unit 1A by the air reservoir 30 between the separation plate 6 and the water surface Wa, the water in the heating unit 1B can be efficiently and very quickly discharged. Boiled in boiling water.

The temperature sensing on-off valve 11 provided at the lower end of the hot water pipe 10, that is, near the zenith of the heating unit 1B, closes by sensing the low temperature of the water when the heating unit 1B is full. ,
When the water in the heating unit 1B is heated and boiled by the heater 5, it detects a predetermined high temperature (for example, 90 degrees) and opens the valve. When this on-off valve 11 is opened, the hot water in the heating unit 1B is stored in the hot water storage unit 1A.
Due to the density difference (specific gravity difference) with the water inside, it rises in the molten metal pipe 10 (solid line arrow) and is stored in the upper part of the hot water storage unit 1A. Since this hot water has a large temperature difference from the water in the hot water storage portion 1A and a density difference (specific gravity difference), it is stored in the upper portion of the hot water storage portion 1A in a separated state without being mixed with water. This state is indicated by reference sign a.

Hot water in the heating unit 1B rises in the hot water pipe 10 and is stored in the zenith of the hot water storage unit 1A, and at the same time, the water in the lower portion of the hot water storage unit 1A is pushed down to pass through the water guiding pipe 7 and the heating unit. Enter the bottom of 1B (dotted arrow). When the amount of entering water increases and the heating section 1B fills up, the low temperature is detected and the on-off valve
11 is closed, and the water in the heating portion 1B is reheated by the heater 5. Then, when the water in the heating unit 1B is boiled into hot water, the on-off valve 11 is opened by sensing the high temperature of the hot water, and the hot water in the heating unit 1B rises in the hot water pipe 10 and the upper part of the hot water storage unit 1A. Is sent to and stored in. After that, this phenomenon is repeated until the hot water storage section
Hot water HW is stored in 1A. In this way, the states in which the hot water HW is intermittently stored in the hot water storage portion 1A are indicated by reference characters A, B, C, and D. In addition, the code | symbol A has shown the state which the hot water a stored in the uppermost part was pushed down one by one by the hot water B, C, and D first. And finally,
It is filled with hot water in the hot water storage section 1A.

Next, returning to FIG. 1, the hot water storage operation of the entire electric water heater will be described. As described above with reference to FIG. 6, when water is supplied to the heating tank 1, the hot water storage tanks 81 and 82 are also supplied with water via the water supply connection pipe 24, and the hot water storage tanks 81 and 82 are also filled with water. When the heater 5 of the heating tank 1 is energized in this state, the inside of the heating portion 1B of the heating tank 1 is boiled up by the heater 5, the on-off valve 11 is opened, and the hot water HW rises in the hot water pipe 10. The hot water is sent to the upper part of the hot water storage unit 1A and stored therein. Since the hot water HW stored in the upper part of the heating tank 1 has a small specific weight, the hot water HW tries to rise upward, so that it passes through the hot water supply connection pipe 25 described above and then the hot water storage tanks 81, 82. Hot water is distributed and stored in each upper part. At the same time, since the water W in the hot water storage tanks 81 and 82 has a large specific weight, the water W is sent to the lower part of the heating section 1B of the heating tank 1 through each of the lower water supply ports 17 and the water supply connecting pipe 24 described above. Water is also sent to the lower part of the hot water storage section 1A via the water conduit 7. As a result of this phenomenon occurring in each tank 1, 81, 82,
The boiling water HW with a small specific weight is not collected in only one tank, but the one with the same specific weight is always kept on the same surface. The heating tank 1 and the hot water storage tanks 81 and 82 are balanced by the difference in specific gravity. It will be. The hot water HW stored up to the middle of the tank capacity in this way is indicated by the symbols A, B, and C. Of course, in each hot water storage tank 81, 82, hot water HW
There is water underneath, but it is separated from the water by density difference (specific gravity difference) and does not mix.

When hot water is supplied, the hot water tap 16 is opened to take out hot water from the tanks 1, 81 and 82.
That is, the pressure of the tap water supplied by the water supply pipe 13 and the water supply connection pipe 24 is applied upward to each of the tanks 1, 81, 82, and the hot water HW is constantly pushed up from below. As described above, in the present embodiment, the hot water is stored from above the tanks 1, 81 and 82, so that the hot water can be supplied immediately even if the total amount in the tank is not hot water. Further, in this embodiment, since the tanks 1, 81, 82 are divided into a plurality of tanks, there is an advantage that they can be installed even in a narrow space.

FIG. 2 is an explanatory view of an electric water heater according to another embodiment of the present invention. Although the embodiment of FIG. 1 does not include a balance pipe, this embodiment is characterized by adding a balance pipe. That is, as shown in FIG.
A lower balance pipe 26 is connected between the lower side of the hot water storage portion 1A of the heating tank 1 and the lower side of the adjacent hot water storage tank 81. The lower balance pipe 26 is connected to the lower side of the hot water storage tank 81 and the lower side of the hot water storage tank 82 adjacent thereto. A lower balance pipe 27 is connected between them. A rectifier 18 is installed near the opening of each lower balance pipe 26, 27. An upper balance pipe 28 is connected between the hot water storage portion 1A of the heating tank 1 and the hot water storage tank 81 adjacent thereto, and the upper balance pipe 28 is connected between the hot water storage tank 81 and the hot water storage tank 82 adjacent thereto. An upper balance pipe 29 is connected between the upper part and the upper part. The lower balance pipes 26, 27 and the upper balance pipes 28, 29 may be provided one by one as shown in the drawing, but may be provided by two or more as shown by imaginary lines.
And, although only the upper balance pipes 28 and 29 may be provided or only the lower balance pipes 26 and 27 may be provided, it is more preferable to provide both.

Here, the purpose of providing each of the balance tubes will be described. There are multiple tanks for storing hot water, and if you take out the hot water from each tank in parallel with one hot water supply pipe 15 from any of the tanks, the hot water is stored in each tank to some extent or all When hot water is supplied after boiling is completed, depending on the hot water supply speed (hot water supply amount per minute),
The amount of hot water stored in one tank is small, and a large amount of hot water may remain in other tanks. In such a case, even if hot water remains in any of the tanks, if hot water is supplied first from a tank that has only a small amount of hot water, the hot water will run out, and then the hot water will be cold water. There may be a phenomenon in which water and hot water in another tank are mixed and only low-temperature hot water can be supplied. As a result of diligent study by the present inventor, it was found that the cause was an imbalance between the water supply pressure and the water supply amount of each tank. In other words, when the hot water heater opens the hot water tap, hot water comes out of the tank because the hot water is floated on the water due to the difference in specific gravity (density difference) in the tank, and moreover, tap water is always in the tank. This is because the water is being supplied and the hot water is being pushed up by the pushing pressure, but in the multi-tube type (multi-tube type) where the tanks are connected in parallel, the water sent from the water supply pipe is split at the water supply port of each tank. Therefore, the momentum of the divided water may cause an imbalance. That is, the force of water (divisional flow rate) becomes stronger as the water is diverted to the diversion port closer to the water supply pipe, and becomes weaker as it goes farther from the water supply pipe. On the other hand, in order for the diverted water diverted from the water supply pipe to enter each tank, the hot water or water in the upper part of the tank must be discharged instead. Therefore, the diverted water entering the tank will not be burdened. Eventually, the diverted water enters the tank from the water supply pipe, pushes up the hot water or water in the tank, and the hot water or water exits the hot water supply port and flows to the hot water supply pipe. It is the cause. Due to the above reasons
In the case of tanks connected in parallel, there may occur a situation in which it is not possible to supply all the hot water in the boiling hot water storage tank.

In the present embodiment, however, the above-mentioned inconvenience can be solved by the lower balance pipes 26, 27 and the upper balance pipes 28, 29 described above. Next, the reason will be described in detail. First, the amount of hot water stored in the heating tank 1 for generating hot water tends to be larger than that of the other hot water storage tanks 81 and 82. Also, the hot water storage tank 81 is a heating tank compared to the hot water storage tank 82. Since it is close to 1, the hot water storage amount tends to be larger than that in the hot water storage tank 82. FIG. 3A shows a state during hot water storage. It is assumed that more hot water HW is stored in the hot water storage portion 1A of the heating tank 1 than in the tanks 81 and 82. Normally,
The water in the tanks 81 and 82 in which a large amount of water with a large specific weight is stored passes through the water supply connection pipe 24 and is fed into the heating tank 1, and at the same time, the hot water storage portion 1A of the heating tank 1 passes through the hot water supply connection pipe 25. The hot water is sent into the hot water storage tanks 81, 82 to equalize the amount of hot water stored in the respective tanks 1, 81, 82. However, this operation takes a long time because hot water and water move only through one pipe (the water supply connection pipe 24 and the hot water supply connection pipe 25), and as described above, an imbalance in the hot water storage amount occurs. It is the cause. However, when the upper / lower balance pipes 26, 27, 28, 29 are provided as in this embodiment, water is supplied from both the water supply connection pipe 24 and the lower balance pipes 26, 27, and hot water is supplied by the hot water supply connection pipes. Since a large amount of hot water flows in a short time because the hot water is sent from both the 25 and the upper balance pipes 28 and 29, the time required to equalize the amount of hot water stored is shortened. For this reason, imbalance of hot water storage is unlikely to occur, and each tank 1, 8
The hot water in 1,82 is stored at a uniform level due to the buoyancy balance.

Next, FIG. 3B shows a state during hot water supply after boiling. Now, considering the case where hot water is supplied from the full boiling state, it is assumed that, for example, the hot water supply speed of the hot water storage tank 81 is high and the hot water storage amount is smaller than that of the other tanks 1, 82. The water W in the hot water storage tank 81, which has a large amount of water stored due to the difference in specific gravity between the hot water HW and the water W, flows through the lower balance pipes 26 and 27 because the diverted water has entered from the water supply port 17, and the heating tank 1 and Water is sent to the hot water storage tank 82, and at the same time, the hot water in the tanks 1 and 82 flows into the hot water storage tank 81 via the upper balance pipes 28 and 29 (solid line arrow), and the hot water storage amount is averaged to a uniform level by buoyancy balance even during hot water supply. it can. As mentioned above,
In this embodiment, it is possible to promote the averaging of the amount of hot water stored between the tanks 1, 81 and 82, and also to promote the averaging of the amount of hot water during hot water supply, so that only hot water is supplied until the end. The problem of supplying low-temperature hot water does not occur.

FIG. 4 is an explanatory view of an electric water heater according to still another embodiment of the present invention. In this embodiment, the upper balance tube 2
It is necessary to provide 8, 29, and in the embodiment of that type, the hot water supply port 2 of the hot water supply pipe 15 to the heating tank 1
An on-off valve 11 is attached to each of the hot water supply ports 23 of the hot water supply tanks 81 and 82 of the hot water supply connection pipe 25. The open / close valve 11 is mounted by projecting a hot water supply pipe 25 from the top of the tank as shown in the figure, and the hot water supply pipe 25 above the open / close valve 11 is provided with an air vent hole 50, or the open / close valve 11 is provided.
Is attached to the top of the tank, and an air vent hole 50 is provided in the mounting flange of the on-off valve 11. The air vent hole 50 is for venting the air in each tank at the time of water supply so that the tank is fully filled with water and for releasing the air generated when the hot water is stored to the hot water supply pipe connection 25. In this case, if there is hot water in the vicinity of the hot water supply port 23 of each tank, the on-off valve 11 opens to let the hot water pass through, but when the hot water comes out and the cold water comes close to it, the on-off valve 11 immediately opens. It senses the low temperature and closes the valve to prevent the passage of cold water. Therefore, it is ensured that hot water is discharged only from the remaining tanks 1, 81, 82.

In each of the above-mentioned embodiments, it is preferable that the water guiding pipe 10 in the hot water storage portion 1A of the heating tank 1 and the water guiding pipe 7 in the heating portion 1B have a heat insulating structure. For a heat insulating structure, a pipe 10
Or stick a material with poor heat conductivity to one or both sides of the water conduit 7, sandwich the material with poor heat conductivity with a metal plate, or use the material with poor heat conductivity to form the water conduit 10 or the water conduit 7. There are methods such as manufacturing, and as a material with poor thermal conductivity,
There are urethane, ceramics, silicon, etc., and there is also a heat insulating structure with an air layer interposed. When the heat insulation is performed by the above method, the heat of the boiling water in the heating section 1B is transferred to the water pipe 7
The water in the hot water storage section 1A is less likely to be deprived by the water in the hot water storage section 1A, and the heat in the hot water pipe 10 is less likely to be taken away by the surrounding water. There is an advantage that you can make hot water.

Next, the expansion method of the present invention will be described. After installing the electric water heater of the present invention, it may be desired to increase its hot water storage capacity. For example, even in household electric water heaters, the amount of hot water used may increase due to an increase in the number of families, the growth of children, changes in life rhythm, etc. In that case, for example, the hot water storage capacity of 370 liters (for a family of four) will be insufficient, 400 liters or 450
There are cases where you want to replace the liter one.
If the conventional hot water storage tank is a single electric water heater, the entire electric water heater must be replaced. However, doing so is uneconomical, and sometimes it cannot be installed if it is changed to a large capacity hot water storage tank. However, the increase method of the present invention has the advantages that the construction is simple and the installation location is not restricted.

Hereinafter, description will be given with reference to FIG. FIG. 5 shows an example in which a new hot water storage tank is provided in the side space of the existing hot water storage tank. That is, a new hot water storage tank 83 is installed on the side of the existing hot water storage tank 82, and the hot water supply connection pipe 25 and the upper balance pipe 29 and the water supply connection pipe 24 and the lower balance pipe 27 are added to the hot water storage tank 83. Connect. The number of hot water storage tanks to be added is not limited to one and may be two or more. In this case, it is necessary to similarly connect between the plurality of added hot water storage tanks. The above-mentioned extension method has an advantage that the construction is simple because it is sufficient to add a hot water storage tank, replace the heater 5 with a large capacity one, and perform piping work. Further, the expansion method of the present invention may replace the above method or may be used in combination to replace the existing hot water storage tank with a large tank.

[0028]

According to the present invention, it is possible to provide a thin electric water heater that can supply hot water immediately and can supply hot water in a short time even after running out of water, and that the installation place is not so limited. And from any of the multiple tanks connected in parallel,
You can take out the hot water in good balance until the end. Also, the hot water storage capacity can be increased with simple construction.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an electric water heater according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of an electric water heater according to another embodiment of the present invention.

3 is an explanatory view (A) of hot water storage and an explanatory view (B) of hot water supply operation of the electric water heater of FIG. 2. FIG.

FIG. 4 is an explanatory view of an electric water heater according to still another embodiment of the present invention.

FIG. 5 is an explanatory diagram of an extension method of the present invention.

FIG. 6 is a vertical cross-sectional view of the heating tank of the present invention.

[Explanation of symbols]

1 Heating tank 1A Hot water storage section 1B
Heating part 5 Heater 6 Separation plate 10
Hot water pipe 11 Temperature sensing on-off valve 13 Water supply pipe 15
Hot water supply pipe 24 Water supply connection pipe 25 Hot water supply connection pipe 26
Lower balance pipe 27 Lower balance pipe 28 Upper balance pipe 29
Upper balance pipe 50 Air vent hole 81-83 Hot water storage tank

Claims (7)

[Claims] 1. A separating plate for partitioning a vertically long tank into an upper hot water storage section and a lower heating section, a heater provided in the heating section, and hot water boiled in the heating section in the hot water storage section. A heating tank consisting of a pipe for sending upwards and a temperature sensing on-off valve that opens when the temperature of the hot water in the heating section interposed in the pipe reaches a predetermined temperature and closes at a temperature below the predetermined temperature. And one or more hot water storage tanks arranged side by side next to the heating tank, and a hot water supply connection pipe that communicates with each other above the hot water storage portion of the heating tank and above each hot water storage tank. It comprises a hot water supply pipe connected to the hot water supply connection pipe, a water supply connection pipe communicating below the heating part of the heating tank and below each hot water storage tank, and a water supply pipe connected to the water supply connection pipe. A quick-heat multi-tube electric water heater characterized in that 2. A lower balance pipe communicating between a lower portion of the hot water storage portion of the heating tank and a lower portion of one hot water storage tank, and a lower balance pipe communicating between lower portions of the respective hot water storage tanks. The quick-heat multitubular electric water heater according to claim 1. 3. An upper balance pipe communicating between an upper part of the hot water storage portion of the heating tank and an upper part of one hot water storage tank, and an upper balance pipe connecting the upper parts of the respective hot water storage tanks to each other. The quick-heat multitubular electric water heater according to claim 1. 4. A temperature-sensing on-off valve that opens when the temperature of the hot water is above a predetermined temperature and closes when the temperature of the hot water is below a predetermined temperature is attached to the hot water inlet of the hot water storage section of the heating tank and the hot water inlet of the hot water storage tank. The rapid heating multi-tube electric water heater according to claim 3. 5. The quick-heat multi-tube electric water heater according to claim 1, wherein one or more hot water storage tanks are added to a lateral space adjacent to the hot water storage tank, and the hot water supply connection pipe is further provided. Is extended to the upper part of the added hot water storage tank and connected,
A method for adding an instant-heat multi-tube electric water heater, characterized in that the water supply connection pipe is extended and connected to a lower portion of the added hot water storage tank. 6. The expansion method according to claim 5, further comprising connecting a lower balance pipe and / or an upper balance pipe between the expanded hot water storage tank and the existing hot water storage tank. How to add an instant heat multi-tube electric water heater. 7. An expansion method for a rapid heating multi-tube electric water heater, characterized in that the existing hot water storage tank is replaced with a larger capacity tank instead of or in addition to the expansion method according to claim 6.