JPH05340604A - Electrical instantaneous hot water heater - Google Patents

Abstract

PURPOSE:To provide an electrical instantaneous hot water heater in which its operation is simple and hot water having a proper temperature can easily be attained. CONSTITUTION:A heater 2, a triac 11 of a control circuit 13 for controlling an electrical conductivity of the heater 2 with a volume switch 12 and a pressure switch 6 are connected in series. Another series connected circuit of an opening or closing switch 9 and an electrical opening or closing circuit of a water stop valve 10 is connected in parallel with the former series connected circuit and then the water stop valve 10 is opened or closed under an operation of the opening or closing switch 9. The water stop valve 10 is opened under 'closing' operation of the opening or closing switch 9 water is fed into a tank 1 at a flow rate adjusted in advance by a flow rate adjusting valve 8 and at the same time the heater 2 is electrically energized at an electrical conductivity set in advance by the volume switch 12, a mere feeding of water through 'closing' operation of the opening or closing switch 9 enables hot water of proper temperature to be always attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric instant water heater used for hot water supply.

[0002]

2. Description of the Related Art Conventionally, an electric instant water heater of this type is shown in FIG.
As shown in FIG. 5 and FIG. 5, the water flowing in from the water inlet pipe 22 operates the pressure switch 25 of the water pressure detector 24 branched from the water inlet pipe 22 via the water stopcock 23 to operate the tank 2
It flows around the two heaters 27 and 28 installed in the unit 6 to be heated, and flows out from the shower head 30 connected to the hot water outlet pipe 29.

At this time, the hot water temperature is set to two heaters 27, 2.
It is determined by the electric power of 8, that is, the amount of heat generation, the water temperature, and the flow rate. Therefore, in order to obtain hot water of an appropriate temperature, the electric power switch 31 energizes the two heaters 27 and 28 at the same time, or energizes only one of them to switch the electric power, and further, the water shutoff 23 The flow rate is adjusted by adjusting the opening.

In the figure, reference numeral 32 is an overheat preventing device that shuts off the electric circuit when the tank 26 is abnormal, 33 and 34 are pilot lamps, and 35 and 36 are resistors for protecting the pilot lamp.

FIG. 6 shows an external view of the main body (not shown) protected by a case 37. The case 37 has a knob 38 for the rotary water stopcock 23 and a knob 39 for the rotary power changeover switch 31. And the display windows 40 of the pilot lamps 33 and 34, which are turned on when the two heaters 27 and 28 are energized,
41 is provided.

In the above structure, when taking a hot water shower, the two heaters 27 and 28 are turned on by the power changeover switch 31 and the water stopcock 23 is opened to pass water. When the water stopper 23 is opened and the water pressure reaches a certain value, the pressure switch 25 of the water pressure detector 24 turns “ON” to energize the heaters 27 and 28, and hot water flows out from the shower head 30.

When the hot water flows out, the opening degree of the water stopcock 23 is adjusted to obtain the appropriate temperature hot water. However, even if the opening degree of the water stopcock 23 is adjusted, the appropriate temperature hot water cannot be obtained. In addition, the electric power selector switch 31 is used for the two heaters 27,
28 is connected in parallel or in series, or is connected to only one to adjust the electric power and further adjust the opening degree of the water stopcock 23 to obtain hot water having an appropriate temperature. ..

Further, even when the water pressure or the temperature of incoming water changes, hot water of an appropriate temperature can be obtained by the same adjustment as described above.

[0009]

In such a conventional electric instant water heater, in order to obtain an appropriate temperature of hot water, the switching between the two heaters 27 and 28 and the opening degree of the water stopcock 23 are frequently performed. However, there is a problem that the same adjustment must be made when the water pressure or the incoming water temperature changes.

Further, during use of the hot water shower, the stop cock 23 is operated several times to repeatedly flow out and stop the hot water, so that the opening degree of the stop cock 23 must be adjusted each time. there were.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric instant water heater which is easy to operate and which can easily obtain hot water having an appropriate temperature.

[0012]

According to the present invention, a tank having a heater installed therein, a water inlet pipe and a hot water outlet pipe connected to the tank, and a pressure connected to the water inlet pipe and opened / closed by the water pressure of the water inlet pipe. A water pressure detector with a switch, a flow rate control valve for controlling the flow rate of the water inlet pipe, a water shutoff valve that opens and closes in conjunction with the on / off of the on / off switch, and a bidirectional control of the energization rate to the heater. A control circuit for controlling via a three-terminal thyristor is provided, the heating heater, the bidirectional three-terminal thyristor, and the pressure switch are connected in series, and the opening / closing switch and the electric shutoff valve are electrically connected to the series circuit. Connect the series circuit with the dynamic switching circuit in parallel,
The water shutoff valve is opened by the "closing" operation of the open / close switch, water is supplied to the tank at a flow rate adjusted in advance by the flow rate adjustment valve, and the heater is energized at a duty ratio preset in the control circuit. It is configured to do.

[0013]

With the above-described structure of the present invention, the water shutoff valve is opened by the "closing" operation of the open / close switch, and the preset flow rate is supplied to the tank by the flow rate control valve.
Since the heater is energized at a preset energization rate by the volume switch of the control circuit, the incoming water can be heated with electric power corresponding to the preset flow rate, and hot water of an appropriate temperature can be obtained.

Further, the flow of hot and cold water in the shower can be stopped and stopped only by operating the open / close switch, and it is not necessary to adjust the flow rate each time.

[0015]

Embodiments of the present invention will now be described with reference to the drawings.

1 to 3, a tank 1 having a heater 2 installed therein is connected to a water supply pipe 3 for supplying water to the tank 1 and a hot water discharge pipe 5 for discharging hot water to a shower head 4.

On the upstream side of the water inlet pipe 3, a water pressure detector 7 having a pressure switch 6 which opens and closes by the water pressure in the water inlet pipe, a flow rate control valve 8 for adjusting the flow rate of the water supplied to the tank 1,
A water shutoff valve 10 such as an electromagnetic valve that opens and closes the flow path of the water inlet pipe 3 by opening and closing the open / close switch 9 is connected.

The heater 2 includes a bidirectional three-terminal thyristor 11 for continuously controlling the electric conductivity of the heater 2.
Control circuit 1 controlled by volume switch 12 via
3 is connected.

Reference numeral 14 is an excessive temperature preventing device for preventing abnormal heating of the tank 1, 15 is an indicator light for indicating the energized state, 16
Is a protection resistance of the indicator lamp 15.

The electric members of the above-mentioned constituent members are connected as shown in FIG. That is, the heater 2, the bidirectional three-terminal thyristor 11, the overheat protection device 14, and the pressure switch 6 are connected in series, and an electrical switch circuit for the open / close switch 9 and the water shutoff valve 10 is connected to this series circuit. A series circuit with the exciting coil 10a of the solenoid valve is connected in parallel.

FIG. 3 is an external view showing that a case 17 protects a main body (not shown), and the case 17 has a flow control valve 8
Rotary knob 18 and volume switch 12 rotary knob 19 and open / close switch 9 vertical knob 20
And the display window 21 of the indicator lamp 15 which is turned on when the heater 2 is energized.

In the above structure, when the open / close switch 9 is operated to be "closed", the exciting coil 10a is energized to open the water shutoff valve 10, water flows through the flow control valve 8 and the water pressure detector 7, and the water enters the tank from the water inlet pipe 3. Water is supplied to 1. Due to this water supply, the water pressure detector 7 operates to close the pressure switch 6, and the heater 2 is energized at the energization rate set by the volume switch 12 to heat the water supplied to the tank 1 to heat it. ..

Here, the proper temperature of the hot water flowing out from the shower head 4 is determined by the electric power of the heater 2 and the flow rate of the supplied water.
Since it is obtained by the water temperature, the energization rate of the volume switch 12 is set in advance according to the season or preference to set the electric power of the heater 2, and the flow rate control valve 8 is also set.
By setting the flow rate in advance, it is possible to always obtain hot water having an appropriate temperature simply by supplying water by "closing" the opening / closing switch 9.

As described above, according to the electric instant water heater of the embodiment of the present invention, the bidirectional three-terminal thyristor 11 of the heating heater 2 and the control circuit 13 for controlling the energization rate of the heating heater 2.
And the pressure switch 6 are connected in series, and a series circuit of the opening / closing switch 9 and the electrical opening / closing circuit of the water shutoff valve 10 is connected in parallel to this series circuit to perform the “closing” operation of the opening / closing switch 9. Thus, water is supplied to the tank 1 at a flow rate adjusted in advance by the flow rate control valve 8 and the heater 2 is energized at a preset energization rate, so that water is supplied by the "closing" operation of the opening / closing switch 9. There is an effect that hot water of a suitable temperature can be obtained only by itself.

[0025]

As described above, according to the electric instant water heater of the present invention, the following effects can be obtained. (1) The water shutoff valve is opened by the "close" operation of the open / close switch that opens and closes the water shutoff valve to the water inlet pipe, and the flow rate preset by the flow rate control valve is supplied to the tank and is preset. Since the heater is energized at the duty ratio and the incoming water can be heated with the power corresponding to the preset flow rate,
By simply "closing" the open / close switch, it is possible to obtain hot water of a suitable temperature that suits the season or taste. (2) The hot water flowing out and stopping during the shower can be performed only by "closing" and "opening" operations of the open / close switch, so that the trouble of adjusting the flow rate each time can be eliminated.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an electric instant water heater in an embodiment of the present invention.

FIG. 2 is a circuit diagram of an electric instant water heater in the same embodiment.

FIG. 3 is an external view of the electric instant water heater in the embodiment.

FIG. 4 is a block diagram of an electric instant water heater in a conventional example.

FIG. 5 is a circuit diagram of an electric instant water heater in the conventional example.

FIG. 6 is an external view of an electric instant water heater in the conventional example.

[Explanation of symbols]

 1 Tank 2 Heater 3 Water inlet pipe 5 Hot water outlet pipe 6 Pressure switch 7 Water pressure detector 8 Flow control valve 9 Open / close switch 10 Water stop valve 11 Bidirectional 3-terminal thyristor 13 Control circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Konishi 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A tank having a heater installed therein, a water inlet pipe and a hot water outlet pipe connected to the tank, and a water pressure detector having a pressure switch connected to the water inlet pipe and opened and closed by the water pressure of the water inlet pipe. A flow rate control valve that controls the flow rate of the water inlet pipe, a water shutoff valve that opens and closes in conjunction with the on / off of an open / close switch, and the energization rate to the heater is controlled via a bidirectional three-terminal thyristor. With a control circuit,
The heating heater, the bidirectional three-terminal thyristor, and the pressure switch are connected in series, and a series circuit of the opening / closing switch and an electric opening / closing circuit of the water shutoff valve is connected in parallel to the series circuit, The water shutoff valve is opened by the "closing" operation of the open / close switch, water is supplied to the tank at a flow rate adjusted in advance by the flow rate control valve, and the heater is energized at a duty ratio preset in the control circuit. An electric instant water heater configured as follows.