JPH085145A - Electric water heater - Google Patents

Abstract

PURPOSE:To respond to the increase of tanks without requiring the change of the piping for water supply pipes, and change of the piping in a box body. CONSTITUTION:An outgoing hot water pipe 14 is connected to the top of a hot water storage tank 13. To the top of the hot water storage tank 13, one end of a circulation piping 15 with a circulation pump 16 is connected. On the bottom of the hot water storage tank 13, one end of a first connecting pipe 22 is connected. At the other end side of the circulation piping 15, one end of a second connecting pipe 23 is connected. To a connecting part 25 on the outside of a box body 12, the other ends of respective connecting pipes 22, 23 are arranged. When a main unit is solely used, the other ends of both connecting pipes 22, 23 are connected by a connecting pipe 26. An incoming water pipe 24 which continues from a water supply pipe is connected to the other end side of the circulation piping 15. When the tanks are increased, the connecting pipe 26 is removed, and a tank to be increased is serially connected between both connecting pipes 22, 23, and a water supply passage which reaches the tank to be increased from the incoming water pipe 24 through the second connecting pipe 23 is constituted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric water heater employing a forced circulation boiling system.

[0002]

2. Description of the Related Art Conventionally, an electric water heater that employs a forced circulation boiling system is provided with a hot water storage tank 1 as shown in FIG.
The hot water outlet pipe 2 is connected to the upper part of the hot water supply pipe 3 and the lower part of the hot water supply pipe 3 is connected to the hot water storage tank 1. It is set up. The hot water storage tank 1, the circulation pipe 4 and the like are housed in the housing 7, and only the hot water supply pipe 2 and the water supply pipe 3 are out of the housing 7.

When the electric water heater is installed, a water supply pipe 3 connected to a water pipe is connected to a lower portion of the hot water storage tank 1, and a hot water supply pipe connected to a hot water supply place such as a bath, a kitchen or a washroom is connected to the hot water discharge pipe 2. It

When hot water is stored, normal temperature water or lukewarm water under the hot water storage tank 1 is drawn into the circulation pipe 4 by the operation of the circulation pump 5 and is boiled up by the heater 6, and the boiled hot water is stored in the hot water storage tank 1 Is sent to the upper part of the hot water storage tank 1 and the hot water is sequentially stored in a stacked manner from the upper side of the hot water storage tank 1.

Further, when tapping hot water, the water stop tap at the tip of the tapping pipe 2 is opened to push up the hot and cold water stored in the upper part of the hot water storage tank 1 by the water supply pressure applied to the lower part of the hot water storage tank 1 through the water supply pipe 3. It is tapped through the tap pipe 2.

[0006] By the way, particularly in an electric water heater designed to perform boiling only in a specific time zone such as a midnight power time zone, the amount of hot and cold water used increases after the electric water heater is installed due to changes in the family structure. Then, the hot water storage capacity may be insufficient. In such a case, the required hot water storage capacity can be secured by adding an electric water heater.

In the case of adding an electric water heater as described above, if the electric water heater having the circulation pump 5 and the heater 6 as shown in FIG. 10 is added, the additional cost is high and a plurality of electric water heaters are required. Since the boiling of the hot water is performed separately, the control as a whole becomes complicated.

Therefore, as shown in FIG. 11, if only the additional hot water storage tank 8 is added, the above-mentioned problems can be alleviated. To add the additional hot water storage tank 8, the circulation pipe 4 connected to the lower portion of the hot water storage tank 1 is removed, the connection portion of the hot water storage tank 1 to which the circulation pipe 4 is connected is closed, and the circulation pipe 4 is closed. The piping inside the housing 7 is changed so that the piping is taken out of the body 7. Further, the water supply pipe 3 connected to the lower portion of the hot water storage tank 1 is removed, and the water supply pipe 3
Is connected to the lower part of the additional hot water storage tank 8, and the connecting pipe 9 connected to the upper part of the additional hot water storage tank 8 is connected to the hot water storage tank 1.
The connecting pipe 10 connected to the lower part of the above and the lower part of the additional hot water storage tank 8 is connected to the circulation pipe 4.

When hot water is stored, room temperature water or lukewarm water at the bottom of the additional hot water storage tank 8 is drawn into the circulation pipe 4 from the connecting pipe 10 by the operation of the circulation pump 5, and is boiled by the heater 6 to be boiled. The collected hot water is sent to the upper part of the hot water storage tank 1 and is sequentially stored from the upper side of the hot water storage tank 1, and when the hot water storage tank 1 is filled with hot water, the hot water is sequentially stored in the upper side of the expanded hot water storage tank 8 through the connecting pipe 9. It At the time of tapping hot water, the water stop tap at the tip of the tapping pipe 2 is opened so that water is added to the lower part of the expanded hot water storage tank 8 through the water supply pipe 3 and to the lower part of the hot water storage tank 1 through the connecting pipe 9 by the hot water storage tank 1
Hot water stored in the upper part of the hot water is discharged from the hot water discharge pipe 2.

[0010]

However, in the case of adding the additional hot water storage tank 8 in the electric water heater adopting the forced circulation boiling method, the water supply pipe 3 connected to the hot water storage tank 1 is replaced with the additional hot water storage tank 8. In addition to the need to change the piping for reconnecting to, the circulation piping 4 and the like inside the housing 7 must be changed, and there is a problem that the piping work is complicated and time-consuming.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an electric water heater which can easily cope with the addition of a tank without the need to change the piping of the water supply pipe or the piping inside the housing. To aim.

[0012]

An electric water heater according to claim 1, wherein the electric water heater comprises a main unit having a hot water storage tank and a heater for boiling hot water stored in the hot water storage tank. The unit includes a hot water outlet pipe connected to an upper portion of the hot water storage tank, a circulation pipe having a circulation pump having one end connected to an upper portion of the hot water storage tank, and a first connection having one end connected to a lower portion of the hot water storage tank. A pipe, a second connecting pipe whose one end is connected to the other end of the circulation pipe, and the other end of the first connecting pipe and the other end of the second connecting pipe are connected when the main unit is used alone. Connection pipe,
A water inlet pipe connected to the other end of the circulation pipe.

The electric water heater according to claim 2 is an electric water heater comprising a main unit having a hot water storage tank and a heater for boiling hot water stored in the hot water storage tank, wherein the main unit is the hot water storage tank. A hot water outlet pipe connected to an upper part of the hot water storage tank, a circulation pipe having a circulation pump having one end connected to an upper part of the hot water storage tank, a first connecting pipe having one end connected to a lower side of the hot water storage tank, and the hot water storage The first connection pipe and the other end of the circulation pipe are connected to the lower part of the tank, and when the main unit is used alone, the hot water storage tank and the circulation pipe are communicated with each other, and when the tank is added, the hot water storage tank and the first connection are connected. A three-way valve that communicates with the pipe and one end is connected to the other end of the circulation pipe, and is closed when the main unit is used alone and when adding a tank. A second connecting pipe having an opening and closing valve wither, in which a said circulation pipe water inlet pipe connected to the other end of the.

An electric water heater according to a third aspect of the present invention is the electric water heater according to the first or second aspect, further comprising a housing for accommodating the main unit, and outside the housing, the other end of the first connecting pipe and the first connecting pipe. A connecting portion is provided in which the other ends of the two connecting pipes are respectively arranged.

An electric water heater according to a fourth aspect is an electric water heater comprising an extension unit connected to the main unit according to any one of the first to third aspects, wherein the extension unit includes an extension hot water storage tank and One end is connected to the upper part of the additional hot water storage tank and one end is connected to the first additional connecting pipe whose other end is connected to the other end side of the first connecting pipe of the main unit and the lower part of the additional hot water storage tank. , A second extension connecting pipe whose other end is connected to the other end of the second connecting pipe of the main unit.

An electric water heater according to a fifth aspect of the present invention is the electric water heater according to the fourth aspect, further comprising an additional housing for accommodating the additional unit, and the other end of the first additional connecting pipe and the outside of the additional housing. The second additional connecting pipe is provided with additional connecting portions to which the other ends are respectively arranged.

According to a sixth aspect of the present invention, there is provided an electric water heater in which the main unit according to any of the first to third aspects is provided with a fourth or fifth aspect.
In the electric water heater in which a plurality of the additional units described are connected in series, the first-stage additional unit connected to the main unit has a first extension connecting pipe as a main unit.
Second connected to the connection pipe of the main unit
In the expansion unit after the second stage, the first expansion connecting pipe is connected to the second expansion connecting pipe of the preceding expansion unit, and the second expansion connecting pipe of the final expansion unit is the main unit. It is connected to the second connecting pipe.

[0018]

In the electric water heater according to claim 1, when the main unit is used alone, the first connecting pipe and the second connecting pipe are connected by the connecting pipe, so that the boiling water from the lower part to the upper part of the hot water storage tank is heated. In addition to the circulation path at the time of up, a hot water outlet passage is formed from the water inlet pipe to the hot water outlet pipe through each connecting pipe, the connecting pipe, and the hot water storage tank. In addition, when the tank is added, the connecting pipe is removed, and the additional tank is connected in series between the first connecting pipe and the second connecting pipe, so that the second pipe is connected to the water inlet pipe.
There is no need to change the piping of the water supply pipe connected to the water intake pipe, because the water supply route to the additional tank is constructed through the connecting pipe of.

In the electric water heater according to claim 2, when the main unit is used alone, the hot water storage tank and the circulation pipe are connected by the three-way valve and the second connecting pipe is closed by the open / close valve, so that the hot water storage tank A circulation path from the lower part to the upper part at the time of boiling is configured, and a hot water outlet path from the water inlet pipe to the hot water outlet pipe through the three-way valve and the hot water storage tank is configured. Further, when adding a tank, the hot water storage tank and the first connecting pipe are communicated with each other by the three-way valve, and the second connecting pipe is opened with the opening / closing valve, so that the first connecting pipe and the second connecting pipe are opened. By connecting the expansion tanks in series, a water supply path from the water intake pipe to the expansion tank through the second connecting pipe is configured, and there is no need to change the piping of the water supply pipe connected to the water intake pipe.

According to the electric water heater of claim 3,
Alternatively, in addition to the function of the electric water heater described in 2, when the tank is added, the first connecting pipe and the second connecting pipe are disposed in the connection portion outside the housing that houses the main unit, so that There is no need to change the piping of, and it can be handled only by the piping work outside the housing.

In the electric water heater according to the fourth aspect, the extension unit is expanded by connecting only the two extension connection pipes of the extension unit to the connection pipes of the main unit.

According to the electric water heater of claim 5,
In addition to the function of the electric water heater described, when the extension unit is connected, the first extension connecting pipe and the second extension connecting pipe are arranged in the extension connecting portion outside the extension housing that houses the extension unit. It is not necessary to change the piping inside the expansion enclosure, and it can be handled only by piping work outside the expansion enclosure.

In the electric water heater according to the sixth aspect, a plurality of additional units are connected in series between the first connecting pipe and the second connecting pipe of the main unit, and the hot water storage amount corresponding to the additional number is increased. Secured.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the first embodiment of the electric water heater of the present invention will be described below with reference to FIGS.

FIG. 1 shows a block diagram of a main unit 11 of the electric water heater. The main unit 11 includes a housing 12,
A hot water storage tank 13 is housed inside 12. This hot water storage tank
A plurality of hot water temperature sensors (not shown) are provided in the vertical direction.

To the upper part of the hot water storage tank 13, one end of a hot water outlet pipe 14 and one end of a circulation pipe 15 are connected. In the circulation pipe 15, a circulation pump 16 for circulating hot water in a lower portion of the hot water storage tank 13 to an upper portion, a heating tank 18 having a heater 17 for boiling room temperature water to be circulated, an electric valve
19 are provided. The temperature of the hot water boiled in the heating tank 18 is detected by a thermistor (not shown), and the circulation amount by the circulation pump 16 is adjusted so that the temperature of the hot water reaches the set temperature.

To the lower part of the hot water storage tank 13, one end of a drainage pipe 21 having an on-off valve 20 is connected and one end of a first connecting pipe 22 is connected.

The other end of the circulation pipe 15 is connected to one end of the second connecting pipe 23 and one end of a water inlet pipe 24.

A connection part 25 for external piping is arranged outside the housing 12, and the connection part 25 has a hot water discharge pipe 14, a drain pipe 21, and a first pipe.
The other ends of the connecting pipe 22, the second connecting pipe 23, and the water inlet pipe 24 are respectively arranged.

At the connecting portion 25, both ends of the connecting pipe 26 connecting the first connecting pipe 22 and the second connecting pipe 23 are attached to and detached from the first connecting pipe 22 and the second connecting pipe 23, respectively. Connected as possible. It should be noted that the connector 27 having a structure that can be easily attached to and detached from the end of each connecting pipe 22 and 23 and the end of the connecting pipe 26.
Is attached.

FIG. 2 shows a block diagram of the extension unit 31 of the electric water heater. The expansion unit 31 includes an expansion housing 32,
An additional hot water storage tank 33 is stored in the additional housing 32.

One end of the first additional connecting pipe 34 is connected to the upper portion of the additional hot water storage tank 33, one end of the second additional connecting pipe 35 is connected to the lower portion of the additional hot water storage tank 33, and the on-off valve 36 is also provided. A drain pipe 37 having is connected.

An extension connecting portion 38 for external piping is arranged outside the extension housing 32, and the extension connecting portion 38 has a first extension connecting pipe 34, a second extension connecting pipe 35, and a drain pipe 37. The other end of each is disposed. The connector 27 as described above is attached to the ends of the connecting pipes 34 and 35.

Next, the operation of this embodiment will be described.

First, when the main unit 11 is used alone, the first connecting pipe 22 and the second connecting pipe 23 are connected by the connecting pipe 26 as shown in FIG. The water supply pipe connected to is connected to the water supply pipe 24, and the hot water supply pipe connected to a bath, kitchen, washroom, etc. is connected to the hot water discharge pipe 14. As a result, a circulation path from the lower part to the upper part of the hot water storage tank 13 at the time of boiling is formed, and the water inlet pipe 24 to the connecting pipes 22, 2
3, a hot water outlet path is formed to the hot water outlet pipe 14 through the connection pipe 26 and the hot water storage tank 13.

Water is supplied from the water supply pipe to the hot water storage tank 13 from the water inlet pipe 24 through the second connecting pipe 23, the connecting pipe 36, and the first connecting pipe 22 to fill the hot water storage tank 13 and each pipe.

When boiling is performed in a specific time zone such as the midnight power time zone, the electric valve 19 is opened and the heater is opened.
The circulation pump 16 is operated while electricity is supplied to 17.

As a result, as shown by the solid line arrow in FIG. 1, from the lower part of the hot water storage tank 13 to the first connecting pipe 22 and connecting pipe 2
6, hot water storage tank 1 through the second connecting pipe 23, circulation pipe 15
A circulation path to the upper part of 3 is formed. Then, by adjusting the circulation amount by the circulation pump 16, the hot water storage tank
The room temperature water in the lower part of 13 is boiled to the set temperature by the heater 17, and the boiled hot water is sent to the upper part of the hot water storage tank 13. The hot water fed to the upper part of the hot water storage tank 13 is stored without being mixed with the room temperature water due to the difference in specific gravity from the lower temperature room water. In this way, the hot and cold water boiled from the upper side of the hot water storage tank 13 is sequentially stored in a laminated manner.

When a set amount of hot and cold water is stored in the hot water storage tank 13 based on the detection by a plurality of hot water temperature sensors provided in the vertical direction of the hot water storage tank 13, the boiling is stopped. When the boiling is stopped, the energization of the heater 17 is stopped, the circulation pump 16 is stopped, and the electric valve 19 is closed.

At the time of tapping water, as shown by the broken line arrow in FIG. 1, the water stop valve at the end of the hot water supply pipe connected to the bath, kitchen, washroom, etc. is opened, so that the water supply pressure from the water supply pipe is increased. 24, second connecting pipe 23, connecting pipe 26, first connecting pipe 22
Since it is added to the lower part of the hot water storage tank 13 through the hot water, the hot water in the upper part of the hot water storage tank 13 is pushed up and discharged from the hot water supply pipe 14 through the hot water supply pipe.

In addition, at the time of maintenance or the additional hot water storage tank 33
For example, at the time of expansion of the
The hot water in the hot water storage tank 13 and each pipe is discharged by opening the open / close valve 20 of.

As described above, in the electric water heater designed to perform boiling only in a specific time zone such as the midnight power time zone, the amount of hot and cold water used increases after the main unit 11 is installed due to changes in the family structure. When the hot water storage capacity becomes insufficient, the extension unit 31 is added to the main unit 11. If the hot water storage capacity of the main unit 11 is insufficient when installing the main unit 11, the extension unit 31 is added from the beginning of the installation of the main unit 11.

FIG. 3 shows a case where one extension unit 31 is added, and FIG. 4 shows a case where two extension units 31 are added.

As shown in FIG. 3, after the main unit 11 is installed, one extension unit 31 is provided adjacent to the main unit 11.
In the case of increasing the number of connecting pipes, in the connecting portion 25 arranged outside the housing 12 of the main unit 11, the connecting pipe 26 is connected to each of the connecting pipes 22, 23.
, And one end of the extension connection pipes 41 and 42 is connected to the connection pipes 22 and 23, respectively. In the extension connection portion 38 arranged outside the extension housing 32 of the extension unit 31, the other end of the extension connection pipe 41 connected to the first connection pipe 22 is connected to the first extension connection pipe 34. , The other end of the extension connection pipe 42 connected to the second connection pipe 23 is connected to the second extension connection pipe 35. As a result, a water supply path from the water inlet pipe 24 to the additional hot water storage tank 33 through the second connecting pipe 23 is formed.

Therefore, in the piping work associated with the expansion of the expansion unit 31, there is no need to change the piping of the water supply pipe, and the outside of the housing 12 of the main unit 11 and the expansion housing 32 of the expansion unit 31 are not required.
It is easy to do, since only the piping work on the outside of the Moreover, when adding the extension unit 31 to the main unit 11, it is easy to connect only the two extension connecting pipes 34 and 35 of the extension unit 31 to the connecting pipes 22 and 23 of the main unit 11 respectively. Can be expanded.

Water is supplied from the water supply pipe from the water supply pipe 24 to the second connecting pipe 23, the additional connecting pipe 42, the second additional connecting pipe 35, the additional hot water storage tank 33, the first additional connecting pipe 34, and the additional connecting pipe. 41, 1st
The hot water storage tank 13 is connected to the hot water storage tank 13 and the expanded hot water storage tank 33 and the pipes are filled.

At the time of hot water storage, as shown by solid line arrows in FIG. 3, from the bottom of the hot water storage tank 13, the first connecting pipe 22, the additional connecting pipe 41, the first additional connecting pipe 34, the additional hot water storing tank 33, and the second hot water storing tank 33 are provided. A circulation path reaching the upper part of the hot water storage tank 13 is formed through the additional connection pipe 35, the additional connection pipe 42, the second connection pipe 23, and the circulation pipe 15. Then, by adjusting the circulation amount by the circulation pump 16, the room temperature water in the lower part of the additional hot water storage tank 33 is boiled to the set temperature by the heater 17, and the boiled hot water is sent to the upper part of the hot water storage tank 13. , The hot water is stored sequentially from the upper side. When the hot water storage tank 13 is filled with the boiling hot water, the hot water in the hot water storage tank 13 is filled with the first connecting pipe 22,
It is sent to the upper part of the additional hot water storage tank 33 through the additional connection pipe 41 and the first additional connection pipe 34, and is sequentially stored in the additional hot water storage tank 33 in a stacked manner from the upper side.

At the time of tapping water, as shown by the broken line arrow in FIG. 3, the water stop valve at the tip of the hot water supply pipe connected to the bath, kitchen, washroom, etc. is opened, so that the water supply pressure from the water supply pipe 24, The lower part of the hot water storage tank 13 through the second connecting pipe 23, the additional connecting pipe 42, the second additional connecting pipe 35, the additional hot water storage tank 33, the first additional connecting pipe 34, the additional connecting pipe 41, and the first connecting pipe 22. Therefore, the hot water in the upper part of the hot water storage tank 13 is pushed up and discharged from the hot water supply pipe 14 through the hot water supply pipe, and the hot water or normal temperature water in the additional hot water storage tank 33 is fed into the hot water storage tank 13.

Further, as shown in FIG. 4, when two extension units 31 are added adjacent to the main unit 11, the first extension unit 31 of the first stage connected to the main unit 11 is connected to the first extension unit 31. The second connecting pipe 34 is connected to the first connecting pipe 22 of the main unit 11 by the additional connecting pipe 41 and is connected to the main unit 11.
The first extension connecting pipe 34 of the extension unit 31 of the first stage and the second extension connecting pipe 35 of the extension unit 31 of the first stage are added connection pipes.
41, and the second extension connection pipe 35 of the second-stage extension unit 31 and the second connection pipe 23 of the main unit 11 are added connection pipes.
Connect at 42.

Also in this case, the piping work associated with the expansion of the expansion unit 31 is only required outside the housing 12 of the main unit 11 and outside the expansion housing 32 of each expansion unit 31, and the water supply pipe is provided. No need to change piping, and it can be done easily.

Water is supplied from the water supply pipe to the lower part of the second-stage additional hot water storage tank 33 through the water inlet pipe 24 and the second connecting pipe 23, and the first from the upper part of the second-stage additional hot water storage tank 33.
From the upper part of the additional hot water storage tank 33 in the first stage to the lower part of the hot water storage tank 13 from the upper part of the additional hot water storage tank 33 in the first stage, the inside of the hot water storage tank 13, each of the additional hot water storage tanks 33 and each pipe are filled. .

When storing hot water, as shown by the solid line arrow in FIG. 4, the additional hot water storage tank from the bottom of the hot water storage tank 13 to the first stage.
From the bottom of the first-stage additional hot water storage tank 33 to the upper part of the second-stage additional hot-water storage tank 33, from the lower part of the second-stage additional hot-water storage tank 33 to the hot water storage tank 13 through the circulation pipe 15.
A circulation path leading to the upper part of is formed. And circulation pump
By adjusting the circulation amount by 16, the room temperature water in the lower part of the second-stage additional hot water storage tank 33 is boiled to the set temperature by the heater 17, and the boiled hot water is sent to the upper part of the hot water storage tank 13. The hot water is successively stored in layers. Hot water storage tank
13 When the inside is filled with boiling water, the hot water storage tank
Hot water is sequentially stored from the lower part of 13 to the upper part of the expanded hot water storage tank 33 of the first stage, and from the lower part of the expanded hot water storage tank 33 of the first stage to the upper part of the expanded hot water storage tank 33 of the second stage.

At the time of tapping water, as shown by the broken line arrow in FIG. 4, the water stop valve at the tip of the hot water supply pipe connected to the bath, kitchen, washroom, etc. is opened, so that the water supply pressure from the water supply pipe becomes the second.
Since it is added to the lower part of the hot water storage tank 13 through the first hot water storage tank 33 and the first hot water storage tank 33,
The hot water in the upper part of the hot water storage tank 13 is pushed up and discharged from the hot water supply pipe 14 through the hot water supply pipe, and the hot water or normal temperature water in the second-stage additional hot water storage tank 33 is fed to the first hot water storage tank 33. Hot water or normal temperature water in the first-stage expanded hot water storage tank 33 is sent to the hot water storage tank 13, respectively.

When a plurality of extension units 31 are added to the main unit 11 as described above, the first extension connecting pipe 34 of the first-stage extension unit 31 is connected to the main unit 11.
11 is connected to the first connecting pipe 22, and the first extension connecting pipe 34 of the expansion unit 31 of the second stage and thereafter is connected to the second extension connecting pipe 35 of the expansion unit 31 of the previous stage, and the final stage Expansion unit
31 second expansion connecting pipe 35 to the main unit 11 second connecting pipe
Just connect to 23.

As described above, there is no need to change the piping of the water supply pipe or the piping inside the housing 12 of the main unit 11 or inside the expansion housing 32 of the expansion unit 31. The expansion unit 31 can be expanded by only outside piping work.

Next, a second embodiment of the present invention will be described with reference to FIG.

In the first embodiment, the heater 17 is connected to the circulation pipe.
The heater 17 is provided in the hot water storage tank 13 in this embodiment, whereas the heater 17 is provided in the hot water storage tank 13.

Then, only the hot water in the upper portion of the hot water storage tank 13 is boiled by the heater 17, and when it is boiled above the set temperature, the circulating pump 16 feeds the normal temperature water in the lower portion of the hot water storage tank 13 and the like. Incoming amount (circulation amount)
By adjusting the
Hot water is sequentially stored from the upper part of the.

The main unit 11 having the structure of the second embodiment can also accommodate the expansion of the expansion unit 31 as in the first embodiment.

Next, a third embodiment of the present invention will be described with reference to FIGS.

FIG. 6 shows a configuration diagram of the main unit 11. A three-way valve 52 is connected to the lower pipe 51 of the hot water storage tank 13, and one end of the first connecting pipe 22 is connected to the three-way valve 52. The other end of the circulation pipe 15 is connected. The three-way valve 52
An electric switching type or a manual switching type is used to switch the lower pipe 51 so that either the first connecting pipe 22 or the circulation pipe 15 is communicated with the lower pipe 51.

The other end of the circulation pipe 15 is connected to one end of a water inlet pipe 24 and one end of a second connecting pipe 23 having an opening / closing valve 53. The opening / closing valve 53 is opened / closed by an electric switching type or a manual switching type.

A connecting portion 25 for external piping is arranged on the outside of the housing 12, and the hot water outlet pipe 14, the drain pipe 21, and the first pipe 25 are connected to the connecting portion 25.
The other ends of the connecting pipe 22, the second connecting pipe 23, and the water inlet pipe 24 are respectively arranged.

When the main unit 11 is used alone, the three-way valve 52 is switched so that the hot water storage tank 13 and the circulation pipe 15 communicate with each other, and the open / close valve 53 is closed. As a result, a circulation path from the lower part to the upper part of the hot water storage tank 13 is formed, and a hot water outlet path from the water inlet pipe 24 to the hot water outlet pipe 14 through the three-way valve 52 and the hot water storage tank 13 is configured. Further, a water supply pipe connected to a water pipe (not shown) is connected to the water supply pipe 24, and a hot water supply pipe connected to a bath, kitchen, washroom, etc. is connected to the hot water discharge pipe 14.

Water is supplied from the water supply pipe to the hot water storage tank 13 from the water supply pipe 24 through the circulation pipe 15, the three-way valve 52 and the lower pipe 51 to fill the hot water storage tank 13 and each pipe.

When boiling is performed in a specific time zone such as the midnight power time zone, the electric valve 19 is opened and the heater is opened.
The circulation pump 16 is operated while electricity is supplied to 17. As a result, as shown by the solid line arrow in FIG.
A circulation path is formed from the lower part to the upper part of the hot water storage tank 13 through the lower pipe 51, the three-way valve 52, and the circulation pipe 15. Then, by adjusting the circulation amount by the circulation pump 16, the room temperature water in the lower part of the hot water storage tank 13 is boiled to the set temperature by the heater 17, and the boiled hot water is sent to the upper part of the hot water storage tank 13 to be stacked. Hot water is sequentially stored in the shape. When the boiling is stopped, the heater 17 is de-energized, the circulation pump 16 is stopped, and the electric valve 19 is closed.

At the time of tapping, as shown by the broken line arrow in FIG. 6, the water stop pressure at the tip of the hot water supply pipe connected to the bath, kitchen, washroom, etc. is opened, so that the water supply pressure from the water supply pipe is increased. Hot water storage tank 13 through 24, three-way valve 52, and lower piping 51
Since it is added to the lower part of the hot water, the hot water in the upper part of the hot water storage tank 13 is pushed up and is discharged from the hot water supply pipe 14 through the hot water supply pipe.

The extension unit 31 shown in the first embodiment can be added to the main unit 11. FIG. 7 shows a case where one extension unit 31 is added, and FIG. 8 shows a case where two extension units 31 are added.

As shown in FIG. 7, when one extension unit 31 is added adjacent to the main unit 11, each of the connecting portions 25 arranged outside the housing 12 of the main unit 11 has One ends of the extension connecting pipes 41 and 42 are connected to the connecting pipes 22 and 23, respectively. In the extension connection portion 38 arranged outside the extension housing 32 of the extension unit 31, the other end of the extension connection pipe 41 connected to the first connection pipe 22 is connected to the first extension connection pipe 34. , The other end of the extension connection pipe 42 connected to the second connection pipe 23 is connected to the second extension connection pipe 35. Further, the three-way valve 52 is switched so that the hot water storage tank 13 and the first connecting pipe 22 communicate with each other, and the opening / closing valve 53 is opened. This allows the water pipe
A water supply channel from 24 to the additional tank 33 through the second connecting pipe 23 is configured.

Therefore, in the piping work associated with the expansion of the expansion unit 31, there is no need to change the piping of the water supply pipe, and the outside of the housing 12 of the main unit 11 and the expansion housing 32 of the expansion unit 31 are required.
It is easy to do, since only the piping work on the outside of the Moreover, when adding the extension unit 31 to the main unit 11, it is easy to connect only the two extension connecting pipes 34 and 35 of the extension unit 31 to the connecting pipes 22 and 23 of the main unit 11 respectively. Can be expanded.

Water is supplied from the water supply pipe from the water supply pipe 24 to the second connection pipe 23, the extension connection pipe 42, the second extension connection pipe 35, the extension hot water storage tank 33, the first extension connection pipe 34, and the extension connection pipe. 41, 1st
Hot water storage tank through connecting pipe 22, three-way valve 52, and lower pipe 51
13 is performed, and the hot water storage tank 13, the expanded hot water storage tank 33, and each pipe are filled.

At the time of hot water storage, as shown by the solid arrow in FIG. 7, from the bottom of the hot water storage tank 13 to the lower pipe 51, the three-way valve 52, the first connecting pipe 22, the additional connecting pipe 41, the first additional connecting pipe 34, Expansion hot water storage tank 33, second expansion connection pipe 35, expansion connection pipe 42,
A circulation path reaching the upper part of the hot water storage tank 13 is formed through the second connecting pipe 23 and the circulation pipe 15. And the circulation pump 16
Additional hot water storage tank by adjusting the circulation amount by
The room temperature water in the lower part of 33 is boiled by the heater 17, the boiled hot water is sent to the upper part of the hot water storage tank 13, and the hot water is sequentially stored in a laminated form from the upper side. When the hot water storage tank 13 is filled with boiling hot water, the hot water in the hot water storage tank 13 is filled with the lower pipe 51, the three-way valve 52, the first connecting pipe 22, and the additional connecting pipe.
41, it is sent to the upper part of the additional hot water storage tank 33 through the first additional connecting pipe 34, and hot water is sequentially stored in the additional hot water storage tank 33 from the upper side.

At the time of tapping water, as shown by the broken line arrow in FIG. 7, the water tap at the tip of the hot water supply pipe connected to the bath, kitchen, washroom, etc. is opened, so that the water supply pressure from the water supply pipe 24, Second connection pipe 23, additional connection pipe 42, second additional connection pipe 35, additional hot water storage tank 33, first additional connection pipe 34, additional connection pipe 41, first connection pipe 22, three-way valve 52, lower part Since it is added to the bottom of the hot water storage tank 13 through the pipe 51,
Hot water at the upper part of 13 is pushed up and discharged from the hot water supply pipe 14 through the hot water supply pipe, and hot water or room temperature water in the additional hot water storage tank 33 is fed into the hot water storage tank 13.

Further, as shown in FIG. 8, when two extension units 31 are added adjacent to the main unit 11, the first extension unit 31 of the first stage connected to the main unit 11 is The second connecting pipe 34 is connected to the first connecting pipe 22 of the main unit 11 by the additional connecting pipe 41 and is connected to the main unit 11.
The first extension connecting pipe 34 of the extension unit 31 of the first stage and the second extension connecting pipe 35 of the extension unit 31 of the first stage are added connection pipes.
41, and the second extension connection pipe 35 of the second-stage extension unit 31 and the second connection pipe 23 of the main unit 11 are added connection pipes.
Connect at 42.

Also in this case, the piping work associated with the expansion of the extension unit 31 only needs to be done outside the housing 12 of the main unit 11 and outside the expansion housing 32 of each extension unit 31. No need to change piping, and it can be done easily.

Water is supplied from the water supply pipe from the water inlet pipe 24 through the second connecting pipe 23 and the additional connecting pipe 42 to the lower part of the second-stage additional hot water storage tank 33 and the second-stage additional hot water storage tank 33.
From the upper part to the lower part of the additional hot water storage tank 33 of the first stage, and from the upper part of the additional hot water storage tank 33 of the first stage to the lower part of the hot water storage tank 13 through the three-way valve 52. The tank 33 and each pipe are filled.

When storing hot water, as shown by the solid line arrow in FIG. 8, the additional hot water storage tank from the bottom of the hot water storage tank 13 to the first stage.
From the bottom of the first-stage additional hot water storage tank 33 to the upper part of the second-stage additional hot-water storage tank 33, from the lower part of the second-stage additional hot-water storage tank 33 to the hot water storage tank 13 through the circulation pipe 15.
A circulation path leading to the upper part of is formed. And circulation pump
By adjusting the circulation amount by 16, the room temperature water in the lower part of the second-stage additional hot water storage tank 33 is boiled to the set temperature by the heater 17, and the boiled hot water is sent to the upper part of the hot water storage tank 13. Are stored in sequence. When the inside of the hot water storage tank 13 is filled with boiling water, the lower part of the hot water storage tank 13 is located above the first expanded hot water storage tank 33 and the lower part of the first expanded hot water storage tank 33 is located at the second stage. Additional hot water storage tank
Hot water is stored in the upper part of 33 one by one.

At the time of tapping water, as shown by the broken line arrow in FIG. 8, the water stop tap at the tip of the hot water supply pipe connected to the bath, kitchen, washroom, etc. is opened, so that the water supply pressure from the water supply pipe becomes the second.
Since it is added to the lower part of the hot water storage tank 13 through the first hot water storage tank 33 and the first hot water storage tank 33,
The hot water in the upper part of the hot water storage tank 13 is pushed up and discharged from the hot water supply pipe 14 through the hot water supply pipe, and the hot water or normal temperature water in the second-stage additional hot water storage tank 33 is fed to the first hot water storage tank 33. Hot water or normal temperature water in the first-stage expanded hot water storage tank 33 is sent to the hot water storage tank 13, respectively.

As described above, when a plurality of extension units 31 are added to the main unit 11, the first extension connecting pipe 34 of the first-stage extension unit 31 is connected to the main unit 11.
11 is connected to the first connecting pipe 22, and the first extension connecting pipe 34 of the expansion unit 31 of the second stage and thereafter is connected to the second extension connecting pipe 35 of the expansion unit 31 of the previous stage, and the final stage Expansion unit
31 second expansion connecting pipe 35 to the main unit 11 second connecting pipe
Just connect to 23.

As described above, there is no need to change the piping in the housing 12 of the main unit 11 or the expansion housing 32 of the expansion unit 31 or the water supply pipe, and The expansion of the expansion unit 31 can be supported only by the piping work in.

Next, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 9 is a block diagram of the main unit 11, in which a heater 17 is provided above the hot water storage tank 13. Then, only the hot water in the upper part of the hot water storage tank 13 is boiled by the heater 17, and if it is boiled above the set temperature, the circulation pump
The room temperature water or the like in the lower part of the hot water storage tank 13 is sent by 16 and hot water at a set temperature is sequentially stored from the upper side of the hot water storage tank 13 by adjusting the sending amount (circulation amount) of the room temperature water or the like.

The main unit 11 of the structure of the fourth embodiment is also
As in the third embodiment, the extension unit 31 can be added.

By providing the motor-operated valve 19 in the circulation pipe 15 as in each of the above-described embodiments, the water inlet pipe 24 can be used when tapping hot water.
Although it is possible to reliably prevent the supply of water from flowing into the upper part of the hot water storage tank 13 through the circulation pipe 15, since the circulation pump 16 and the heating tank 18 have flow path resistance, even if the motorized valve 19 is not provided, Due to the flow path resistance, the water supply from the water inlet pipe 24 does not flow into the upper part of the hot water storage tank 13 through the circulation pipe 15.

[0085]

According to the electric water heater according to the first aspect of the present invention, when the main unit is used alone, if the first connecting pipe and the second connecting pipe are connected by the connecting pipe, the hot water storage tank moves from the lower part to the upper part. It is possible to configure a circulation path for boiling up, and to configure a hot water outlet path from the water inlet pipe to the hot water outlet pipe through each connecting pipe, connecting pipe, and hot water storage tank. If an additional tank is connected in series between the connecting pipe and the second connecting pipe, a water supply path from the water inlet pipe to the additional tank through the second connecting pipe can be configured, so that the water supply connected to the water inlet pipe There is no need to change the piping of the pipes, and it is possible to easily accommodate the addition of additional tanks.

According to the electric water heater of the second aspect, when the main unit is used alone, the three-way valve connects the hot water storage tank and the circulation pipe, and the second connecting pipe is closed by the opening / closing valve, the lower part of the hot water storage tank is used. It is possible to configure a circulation path from the inlet to the upper part during boiling, and to configure a hot water outlet path from the water inlet pipe to the hot water outlet pipe through the three-way valve and the hot water storage tank. Also, when adding a tank, use the three-way valve to connect the hot water storage tank to the first connection. The second connecting pipe can be connected to the pipe by opening the second connecting pipe with the on-off valve and connecting the expansion tank in series between the first connecting pipe and the second connecting pipe. Since the water supply path to the additional tank can be configured through, it is not necessary to change the piping of the water supply pipe connected to the water inlet pipe, and it is possible to easily accommodate the expansion of the additional tank.

According to the electric water heater of the third aspect, in addition to the effect of the electric water heater of the first or second aspect, when the tank is added, the first connecting pipe and the second connecting pipe form the main unit. Since it is arranged at the connection part outside the housing to be stored, there is no need to change the piping inside the housing, and it is possible to deal with it only by piping work outside the housing.

According to the electric water heater of claim 4, when the extension unit is added to the main unit, only the two extension connecting pipes of the extension unit are connected to the connecting pipes of the main unit. , You can easily add more.

According to the electric water heater of the fifth aspect, in addition to the function of the electric water heater of the fourth aspect, the first extension connecting pipe and the second extension connecting pipe are added when the extension unit is connected. Since it is arranged in the extension connection part outside the extension housing that houses the unit, there is no need to change the piping inside the extension housing, and it is possible to handle it only by piping work outside the extension housing.

According to the electric water heater of the sixth aspect, a plurality of extension units can be connected in series between the first connecting pipe and the second connecting pipe of the main unit, and the number of extension units can be increased. It is possible to secure a corresponding amount of hot water storage.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a main unit showing a first embodiment of an electric water heater of the present invention.

FIG. 2 is a configuration diagram of an extension unit according to the embodiment.

FIG. 3 is a configuration diagram in which one extension unit is added to the main unit of the above embodiment.

FIG. 4 is a configuration diagram in which two extension units are added to the main unit of the above embodiment.

FIG. 5 is a configuration diagram of a main unit showing a second embodiment of the electric water heater of the present invention.

FIG. 6 is a configuration diagram of a main unit showing a third embodiment of the electric water heater of the present invention.

FIG. 7 is a configuration diagram in which one extension unit is added to the main unit of the above embodiment.

FIG. 8 is a configuration diagram in which two extension units are added to the main unit of the above embodiment.

FIG. 9 is a configuration diagram of a main unit showing a fourth embodiment of the electric water heater of the present invention.

FIG. 10 is a configuration diagram of a conventional electric water heater.

[Fig. 11] Fig. 11 is a configuration diagram in which one additional hot water storage tank is added to the electric water heater of the conventional example as above.

[Explanation of symbols] 11 Main unit 12 Case 13 Hot water storage tank 14 Hot water pipe 15 Circulation pipe 16 Circulation pump 17 Heater 22 First connecting pipe 23 Second connecting pipe 24 Water inlet pipe 25 Connection part 26 Connection pipe 31 Expansion unit 32 Expansion cabinet 33 Expansion hot water storage tank 34 First expansion connection pipe 35 Second expansion connection pipe 38 Expansion connection 52 Three-way valve 53 Open / close valve

Claims (6)

[Claims] 1. An electric water heater comprising a main unit having a hot water storage tank and a heater for boiling hot water stored in the hot water storage tank, wherein the main unit is a hot water outlet pipe connected to an upper portion of the hot water storage tank. A circulation pipe having a circulation pump having one end connected to an upper portion of the hot water storage tank; a first connecting pipe having one end connected to a lower portion of the hot water storage tank; and one end connected to the other end of the circulation pipe. A second connecting pipe, a connecting pipe connecting the other end of the first connecting pipe and the other end of the second connecting pipe when the main unit is used alone, and connected to the other end of the circulation pipe. An electric water heater characterized by having a water inlet pipe. 2. An electric water heater comprising a main unit having a hot water storage tank and a heater for boiling hot water stored in the hot water storage tank, wherein the main unit is a hot water outlet pipe connected to an upper portion of the hot water storage tank. A circulation pipe having a circulation pump having one end connected to an upper portion of the hot water storage tank; a first connecting pipe having one end connected to a lower side of the hot water storage tank; A three-way valve that connects the first connecting pipe and the other end of the circulation pipe, connects the hot water storage tank to the circulation pipe when the main unit is used alone, and connects the hot water storage tank to the first connection pipe when adding a tank. A first end connected to the other end of the circulation pipe and having an opening / closing valve that is closed when the main unit is used alone and opened when adding a tank An electric water heater comprising: a second connecting pipe; and a water inlet pipe connected to the other end of the circulation pipe. 3. A housing for accommodating the main unit is provided, and a connecting portion is provided outside the housing, in which the other end of the first connecting pipe and the other end of the second connecting pipe are respectively arranged. The electric water heater according to claim 1 or 2, which is characterized. 4. An electric water heater comprising an extension unit connected to the main unit according to any one of claims 1 to 3, wherein the extension unit has an additional hot water storage tank and one end at an upper portion of the additional hot water storage tank. A first end connected to the other end of the first connecting pipe of the main unit
A second connecting pipe having one end connected to the lower part of the additional hot water storage tank and the other end connected to the other end of the second connecting pipe of the main unit.
An electric water heater equipped with an additional connecting pipe of. 5. An additional enclosure for accommodating an additional unit is provided, and the other end of the first additional connecting pipe and the second enclosure are provided outside the additional enclosure.
5. The electric water heater according to claim 4, further comprising an additional connection portion in which the other ends of the additional connection pipes are provided. 6. An electric water heater in which a plurality of extension units according to claim 4 or 5 are connected in series to the main unit according to any one of claims 1 to 3, and a first water heater is connected to the main unit. In the expansion unit of the second stage, a first expansion connection pipe is connected to a first connection pipe of a main unit, and the expansion units of the second and subsequent stages connected to the main unit have a first expansion connection. The pipe is connected to the second expansion connecting pipe of the preceding expansion unit, and the second expansion connecting pipe of the final expansion unit is connected to the second expansion pipe of the main unit. Electric water heater.