JP3170996B2 - Electric instantaneous 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 instantaneous water heater used for hot water supply and shower.

[0002]

2. Description of the Related Art A conventional electric instantaneous water heater is shown in FIGS.
This will be described with reference to FIG. As shown in the figure, water flowing from a water inlet pipe 1 is heated in a tank 6 having a heater 5 via a flow detector 2, a water stopcock 3, and a flow control valve 4, and is connected to a tapping pipe 7. It flows out of the shower head 9 through the shower hose 8. At this time, the heating temperature of the heater 5 can be adjusted by the water temperature and the flow rate. Therefore, in order to obtain a comfortable hot water temperature, the volume adjusting volume 10 is adjusted in advance to a desired hot water temperature,
The control circuit 12 compares the resistances of the thermistor 11 for detecting the temperature of the hot water and the resistance of the capacity adjusting volume 10 with the control circuit 12 to control the duty ratio of the heater 5, thereby adjusting the hot water temperature to a desired value. In addition, the tank 7 is provided with a protector 13 for preventing heating when an abnormality occurs.

The flow rate detector 2 shown in FIG. 11 comprises a paddle section 14 and a reed switch 15, and the paddle section 14
Is composed of a magnet 16, a paddle 17, a paddle stand 18, and a pin 19. When the paddle 17 on which the magnet 16 is mounted moves to the reed switch 15 side with the pin 19 as a fulcrum by the flow rate from the water inlet pipe 1, 1
The reed switch 15 is turned ON by the magnetic field of 6,
When running water stops, paddle 1 with magnet 16 attached
7 moves to the inlet pipe 1 side with the pin 19 as a fulcrum, and the reed switch 15 is turned off.
When 5 is turned on after being turned on by the magnet 16, a delay of the off point of the reed switch 15 due to the magnetic field of the magnet 16 occurs. The flow state is transmitted to the control circuit 12 via the reed switch 15.

[0004]

However, in the above-mentioned conventional configuration, when the set flow rate changes due to variations in the magnet 16 and the reed switch 15, it cannot be easily adjusted, and the flowing water is stopped. Nevertheless, the reed switch 15
May not be turned off.

An object of the present invention is to solve the above-mentioned problem and to provide an electric instantaneous water heater having a flow rate detector which can be easily adjusted.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a tank having a heater, a water inlet pipe, a hot water pipe, a water stopcock, a water stopcock, and a water tap connected to the tank. A flow rate detector, a flow rate control valve is disposed therebetween, a thermistor for detecting the hot water temperature is further disposed, and the flow rate detector, a signal from the thermistor, a controller for controlling the heating heater, comprising: The flow rate detector is composed of a paddle part having a magnet provided with a balance plate capable of adjusting the weight and a reed switch, and the paddle part moves depending on the magnitude of the flow rate to turn on / off the reed switch.
Then, the set flow rate is adjusted by adjusting the weight of the balance plate.

[0007]

According to the present invention, the set flow rate can be easily adjusted by changing the weight of the balance plate even if the components constituting the flow rate detector vary due to the above configuration.
The reed switch can be reliably turned ON / OFF.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the instant electric water heater according to the present invention will be described below with reference to the drawings.

FIG. 1 is an external view of an electric instantaneous water heater, 20 is a water inlet pipe, 21 is a stopcock knob, 22 is a flow control valve knob, 23 is a volume control knob, 24 is a shower hose, and 2 is a shower hose.
Reference numeral 5 denotes a shower head. FIG. 2 is a layout diagram of the internal configuration of the electric instantaneous water heater, 26 is a flow detector, 27 is a water stopcock, 2
8 is a flow control valve, 29 is a volume control volume, 30 is a tank, 31 is a control circuit, and 32 is a thermistor. FIG.
As shown in FIG. 4 and FIG.
Through a flow detector 26, a water stopcock 27, and a flow control valve 28,
It is heated in the tank 30 having the heater 33 and flows out from the shower head 25 via the shower hose 24 connected to the tapping pipe 34. At this time, the heating temperature of the heater 33 can be adjusted by the water temperature and the flow rate.

Therefore, in order to obtain a comfortable hot water temperature, the hot water temperature is adjusted in advance by the capacity adjusting knob 23, and the resistance of the thermistor 32 for detecting the hot water temperature of the tank 30 and the resistance of the capacity adjusting volume 29 are controlled by the control circuit 31. The configuration is such that the duty ratio of the heater 33 is controlled by comparing the values to adjust the temperature to a desired hot water temperature. Note that the tank 30 is provided with a protector 35 for preventing heating in an abnormal state.

FIG. 5 shows a reed switch 36 used in the flow detector 27 in an OFF state.
Is a lead piece, and 39 is a contact portion. FIG. 6 shows the principle of operation when the reed switch 36 is in the ON state. When the magnet 40 is brought close to the reed switch 36, the reed piece 38 is magnetized by the magnetic field 41N-S of the magnet 40, and the opposed contact portions 39 attract each other. It comes into contact and becomes ON state. If the magnetic field is erased, it will be in the OFF state.

A description will be given with reference to FIGS.
FIG. 7 shows the flow detector 26, and FIG. 7 shows a state where the reed switch 36 is in an OFF state with the flowing water stopped. FIG. 8 shows that the reed switch 36 is in the ON state in a state of flowing water. The paddle portion 42 includes a paddle 43, a magnet 40, a balance plate 45, a pin 46, and a paddle base 47. The weight can be adjusted by changing the thickness of the balance plate 45, and its own weight (from the pin 46 serving as a fulcrum). Rotation torque)
, The ON / OFF set flow rate can be adjusted. Further, when the reed switch 36 is turned on after being turned on by the magnet 40, the delay of the off point of the reed switch 36 due to the magnetic field of the magnet 40 can be prevented. The material of the balance plate is a non-magnetic material such as brass or stainless steel, which has a large specific gravity and can be made hard to corrode with water.

[0013]

As described above, in the electric instantaneous water heater incorporating the flow rate detector of the present invention, the set flow rate can be easily adjusted by adjusting the weight of the balance plate, and the reed switch is reliably turned on. / OFF electric instantaneous water heater can be provided.

[Brief description of the drawings]

FIG. 1 is an external view of an instantaneous electric water heater according to one embodiment of the present invention.

FIG. 2 is an internal configuration diagram of the embodiment.

FIG. 3 is a water circuit and an electric circuit diagram of the embodiment.

FIG. 4 is a water circuit diagram of the embodiment.

FIG. 5 is an OFF state diagram of a reed switch used in the embodiment.

FIG. 6 is an ON state diagram of a reed switch used in the embodiment.

FIG. 7 is an OFF state diagram of the flow rate detector of the embodiment.

FIG. 8 is an ON state diagram of the flow rate detector of the embodiment.

FIG. 9 is a water circuit and electric circuit diagram of a conventional example.

FIG. 10 is a water circuit diagram of a conventional example.

FIG. 11 is a diagram of a conventional flow rate detector.

[Description of Signs] 20 Water inlet pipe 26 Flow rate detector 27 Stopcock 28 Flow rate control valve 29 Volume control volume 30 Tank 31 Control circuit 32 Thermistor 33 Heater 34 Hot water pipe 35 Protector 36 Reed switch 40 Magnet 42 Paddle part 45 Balance Board

Claims (2)

(57) [Claims] 1. A tank having a heater, a flow detector, a flow control valve disposed between a water inlet pipe, a hot water pipe, a water stopcock, and the water inlet pipe and the tank which are connected to the tank in a watertight manner. Further, a thermistor for detecting the temperature of the hot water is provided, and the flow rate detector includes a controller for controlling the heater by a signal from the thermistor, and the flow rate detector includes a balance plate capable of adjusting the weight. The paddle unit has a magnet and a reed switch. The paddle unit moves depending on the flow rate, and turns on / off the reed switch.
An electric instantaneous water heater that is turned off and adjusts the set flow rate by adjusting the weight of the balance plate. 2. The electric instantaneous water heater according to claim 1, wherein the balance plate is made of a non-magnetic material having a high specific gravity and a high corrosion resistance to water, such as brass or stainless steel.