JP2543495Y2 - Electric water heater - Google Patents

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 used in a general house.

[0002]

2. Description of the Related Art As an electric water heater used in a general house, a water supply port is provided at a bottom portion and a tap hole is provided at an upper portion.
The hot water storage tank is provided with an electric heater mounted on the bottom of the tank, and the water stored in the hot water storage tank is heated by the electric heater. It is common to use a structure that raises the pressure to a maximum. In this type of electric water heater, the above-described boiling operation is usually performed during a midnight power supply time period (11:00 pm to 7:00 am).

[0003] However, such a hot water storage type electric water heater has a disadvantage that an installation space is very large.
Due to rising land prices, it is becoming difficult to install in small space houses. Therefore, recently, a structure has been proposed in which the hot water storage unit and the heating unit are separated from each other, and the hot water storage unit is configured with a plurality of tanks, thereby increasing the degree of freedom of the installation location, thereby saving space. ing.

[0004]

By the way, in a hot water storage type electric water heater, usually, after the water in the hot water storage tank is boiled by midnight power, the hot water in the tank is left as it is. . Therefore, during the daytime power supply time, the hot water in the hot water storage tank is separated into a high-temperature layer and a low-temperature layer, and there has been a problem of heat loss from the high-temperature layer. In particular, when the hot water storage section is constituted by a plurality of tanks, the heat radiation area of the high-temperature layer section is larger than that of a single tank, and the heat loss is further increased. In addition, when the hot water storage unit is divided into a plurality of tanks, each of those tanks is often installed under the floor near a hot water supply place or the like, and in this case, each hot water storage tank is usually of a horizontal type. Therefore, the above problem becomes more serious.

The present invention has been made in view of such circumstances, and has as its object a structure in which a heater is separated and a hot water storage section is constituted by a plurality of tanks.
It is an object of the present invention to provide an electric water heater having a structure capable of equalizing the temperature of hot water in each hot water storage tank during a time period during which power is supplied during daytime.

[0006]

A structure for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The present invention is directed to a first embodiment in which a water supply port 1a is provided at the bottom. A hot water storage tank 10 and a second hot water storage tank 2 having a hot water supply port 2b provided at an upper portion thereof; a hot water storage unit 10 having at least two of these hot water storage tanks;
b, an outgoing pipe 4 having one end communicating with the bottom in the first hot water storage tank 1 and the other end communicating with a water inlet 3a of the heater 3, and a discharge pipe 4 connected to the outgoing pipe 4. One end communicates with the pump P whose outlet communicates with the water inlet 3a of the heater 3 and the hot water outlet 3b of the heater 3, and the other end connects with the second hot water storage tank 2.
A return pipe 5 communicating with an upper portion of the hot water storage tank and each of the hot water storage tanks 1 and 2 of the hot water storage section 10 are connected in series, one end of which is connected to the bottom of the second hot water storage tank 2 and the other end of which is the first hot water storage tank. A communication pipe 6 communicating with an upper part in the tank 1 is provided. One end communicates with the return pipe 5 between the water inlet 3a and the hot water outlet 3b of the heater 3 and the other end communicates with the discharge port side of the pump P of the going pipe 4 via the three-way valve V. It is characterized by connecting the pipe 7.

[0007]

First, during the boiling operation, the three-way valve V is
With the bypass pipe 7 side closed, the pump P is driven and the heater 3 is driven. Thereby, the low-temperature water in the tanks 1 and 2 is transferred to the first hot water storage tank 1 → the heater 3 →
The hot water is circulated and heated through the piping systems 4, 5, and 6 in the order of the second hot water storage tank 2 and the first hot water storage tank 1.

On the other hand, when the power supply period of the daytime enters, the three-way valve V is switched. By this valve switching,
A circulation line is formed between the second hot water storage tank 2 and the first hot water storage tank 1 through the bypass pipe 7. In this state, when only the pump P is driven, the hot water flows between the respective tanks 1 and 2. Circulation, whereby the hot water inside each of the tanks 1 and 2 does not separate into a high-temperature layer and a low-temperature layer.

[0009]

FIG. 1 is a block diagram of an embodiment of the present invention, showing both a piping system diagram and a control system block diagram.

Hot water storage unit 10 includes first and second hot water storage tanks 1 and 2. The two tanks 1 and 2 are connected by a communication pipe 6, and an upper part in the first tank 1 and a lower part in the second tank 2 communicate with each other. The two hot water storage tanks 1 and 2 are standing type closed tanks having substantially the same shape.

A water supply port 1a is provided at the bottom of the first hot water storage tank 1, and a water supply pipe 1 is connected to the water supply port 1a.
1 is connected. The water supply pipe 11 has an electromagnetic water supply valve SV.
Is connected. Further, a hot water supply port 2b is provided at an upper portion of the second hot water storage tank 2, and a hot water supply pipe 12 is connected to the hot water supply port 2b. Note that a flow meter FM is connected to the hot water supply pipe 12.

On the other hand, the heater 3 includes a heating tank 31 and an electric heater 32 disposed inside the heating tank 31. The water inlet 3a of the heater 3 communicates with the bottom of the first hot water storage tank 1 through the outgoing pipe 4, and a pump P is connected to the outgoing pipe 4 with the discharge port side facing the heater 3. ing. Further, the hot water outlet 3b of the heater 3 communicates with the upper part in the second hot water storage tank 2 through the return pipe 5, so that the two pipes 4, 5 and the connecting pipe 6 allow the first hot water outlet 3b. Of the hot water storage tank 1 → the pump P → the heater 3 → the second hot water storage tank 2 → the first hot water storage tank 1.

A water inlet 3a and a hot water outlet 3b of the heater 3 are provided.
Is connected to the bypass pipe 7. One end of the bypass pipe 7 communicates with the discharge port side of the pump P of the going pipe 4 through a three-way valve V, and the other end returns to the return pipe 5.
Is in communication with Note that the three-way valve V is an electromagnetic valve.

At the bottom of the first hot water storage tank 1 and at the heating tank 31, a temperature sensor (both not shown) for detecting the water temperature inside each of the first hot water storage tank 1 and the like are arranged. The output signal of the flow meter FM of the hot water supply pipe is input to the control device 8.

The control device 8 is configured to control each part described later based on an input signal. The control device 8 calculates the peak shift at the start of the boiling operation in the energization time period of the late-night power based on the detection value of the temperature sensor disposed in the hot water storage tank and the like. The control is also performed.

Next, the operation of the embodiment of the present invention together with the operation of the control device 8 will be described. First, in the boiling operation mode, the control device 8 drives the pump P and the heater 32 in a state where the three-way valve V is set so that the bypass pipe 7 side is closed. The second hot water storage tank 2 and the first hot water storage tank 1 are heated.

For the heating at this time, the pump P and the heater 32 are controlled to be ON / OFF so that the heating tank 31 is first filled with low-temperature water, and then the low-temperature water is heated and boiled. Each time the hot water in the heating tank 31 is
A so-called batch-type heating is adopted, in which the hot water is sequentially pushed into the second hot water storage tank 2 from the top, and then sequentially pushed into the first hot water storage tank 1.

When the above-mentioned boiling operation is completed, that is, at 7:00 am, the power supply to the heater 32 is stopped and the three-way valve V is switched. By this valve switching, a circulation line such as the first hot water storage tank 1 → the pump P → the bypass pipe 7 → the second hot water storage tank 2 → the first hot water storage tank 1 is formed.
By driving the pump P again, hot water is circulated between the first and second hot water storage tanks 1 and 2.

Here, when the flow meter FM detects this during hot water supply, the drive of the pump P is locked and the electromagnetic water supply valve SV is opened. By this operation, at the time of hot water supply, the first hot water storage tank 1 is replenished with water in an amount corresponding to the hot water used for hot water supply by the secondary pressure of the hot water supply, similarly to a general electric water heater.

In the above-described embodiment of the present invention, the hot water storage unit 10 is constituted by two hot water storage tanks, but the number thereof may be three or more, if necessary.
In this case, the tanks are connected to each other so that the top of one tank and the bottom of the next tank communicate with each other, similarly to the structure shown in FIG. In addition, even if the hot water storage tank is of a horizontal type, the present invention can be applied as a matter of course, and in this case, the effect is further enhanced.

Further, as a heating method at the time of boiling,
A continuous circulation / heating method may be employed instead of the batch method.

[0022]

[Effects of the Invention] As described above, according to the present invention,
Since the circulation line of hot water is formed only between a plurality of hot water storage tanks without passing through a separate heater at times other than the midnight power supply time zone, the hot water in each of these hot water storage tanks is formed. Can be made uniform. This eliminates heat loss due to heat radiation of the high heat layer formed in the tank, which has been a particular problem in the case where the heater is separated and the hot water storage unit is configured with a plurality of tanks. The heat retention effect is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, showing a block diagram of a piping system and a control system together.

[Explanation of symbols]

 10 hot water storage unit 1 first hot water storage tank 1a water supply port 2 second hot water storage tank 2b hot water supply port 3 heater 31 ··· Heating tank 32 ··· Electric heater 3a ··· Water inlet 3b ··· Hot water outlet 4 ··· Outgoing pipe P ··· Pump 5 ··· Return pipe 6 ···・ Connection pipe 7 ・ ・ ・ ・ Bypass pipe V ・ ・ ・ ・ 3-way valve 8 ・ ・ ・ ・ Control device

Claims (1)

(57) [Scope of request for utility model registration] A hot water storage unit having at least two hot water storage tanks, a first hot water storage tank having a water supply port provided at a bottom portion, and a second hot water storage tank having a hot water supply port provided at an upper portion; A heater having a water inlet and a hot water outlet, an outgoing pipe having one end communicating with the bottom in the first hot water storage tank, and the other end communicating with the water inlet of the heater, A pump having an outlet communicating with the water inlet of the heater, a return pipe having one end communicating with the hot water outlet of the heater, and the other end communicating with an upper portion of the second hot water storage tank; A hot water storage tank is connected in series, one end of which is connected to a bottom of the second hot water storage tank, and the other end of which is provided with a communication pipe which communicates with an upper portion of the first hot water storage tank. One end communicates with the return pipe between the water inlet and the hot water outlet. , The other end of the pump of the outgoing pipe
An electric water heater having a bypass pipe connected to the discharge port side of the circulator through a three-way valve.