JPH08327143A - Electric instantaneous water heater - Google Patents

Abstract

PURPOSE: To easily ensure an adjustment of a set flow rate and hence securely turn a reed switch on/off by altering the weigh of a balance plate and the diameter of a water supply hole even when variations of parts are produced. CONSTITUTION: In a flow rate detector 26 of an electric instantaneous water heater, a reed switch 36 is turned off when a flow rate is interrupted, while the reed switch 36 is turned off during the flow rate is continued. A paddle part 42 comprises a paddle 43, a magnet 40, a balance plate 45, a pin 46, and a paddle base 47. The weight of the balance plate 45 can be varied by altering the thickness of the balance plate 45, and an on/off set flow rate can be easily adjusted by changing the self weight (rotating torque) of the pin 46 being a support point and the diameter of a water supply hole 48 in the paddle base 47. Further, when the reed switch 36 is turned on and thereafter turned off by a magnet 40, the reed switch 36 is prevented from being rendered to off point delay of the reed switch 36 owing to a magnetic field of the magnet 40.

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 a hot water shower.

[0002]

2. Description of the Related Art A conventional electric instant water heater is shown in FIGS.
Refer to 0 for explanation. As shown in the figure, the water introduced from the water inlet pipe 1 is heated in the tank 6 having the heater 5 through the flow rate detector 2, the water shutoff valve 3, and the flow rate control valve 4, and is connected to the hot water outlet pipe 7. It flows out from the shower head 9 through the shower hose 8. As for the hot water temperature at this time, the heat generation amount 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 hot water temperature is adjusted to the desired hot water temperature in advance by the volume adjusting volume 10, and the resistance values of the thermistor 11 and the volume adjusting volume 10 for detecting the hot water temperature of the tank 6 are compared by the control circuit 12. Then, the energization rate of the heater 5 is controlled to adjust the hot water temperature to your liking. In addition, the tank 6 is provided with a protector 13 for preventing heating at the time of abnormality. The flow rate detector 2 shown in FIG. 11 comprises a paddle portion 14 and a reed switch 15, and the paddle portion 14 is composed of a magnet 16, a paddle 17, a paddle base 18 and a pin 19, and the water inlet pipe 1
Paddle 1 with magnet 16 attached depending on the flow rate from
When 7 moves toward the reed switch 15 side with the pin 19 as a fulcrum, the magnetic field of the magnet 16 causes the reed switch 15 to move.
Is turned on, and when the running water is stopped, the paddle 17 with the magnet 16 is attached to the water inlet pipe 1 with the pin 19 as the fulcrum.
It moves to the side and the reed switch 15 is turned off, but the reed switch 15 is turned on by the magnet 16.
When it is turned off after that, the OFF point delay of the reed switch 15 occurs due to the magnetic field of the magnet 16. The flow rate state is transmitted to the control circuit 12 via the reed switch 15.

[0003]

However, in the above-mentioned conventional configuration, when the set flow rate is changed due to the variation of the magnet 16 and the reed switch 15, it cannot be easily adjusted, and the running water is stopped. Nevertheless, due to the magnetic field of the magnet 16, the reed switch 15
There is also a possibility that the status cannot be turned off. The present invention solves the above problems, and an object of the present invention is to provide an electric instant water heater equipped with an easily adjustable flow rate detector.

[0004]

In order to achieve the above object, the present invention provides a tank having a heater, a water inlet pipe and a hot water outlet pipe passing through the tank, a flow rate detector provided in the water inlet pipe, and a flow rate control. The flow rate detector has a valve and a water stopcock, and the flow rate detector includes a paddle table that forms a water passage hole, a paddle section that is provided above the paddle table, and rotates around one point of the paddle table, and a paddle section. And a reed switch for energizing the heater when the magnet approaches, the weight of the balance plate and the diameter of the water passage hole are varied to adjust the set flow rate. It is a thing.

Furthermore, the balance plate is made of corrosion-resistant brass. The balance plate is made of corrosion-resistant stainless steel.

[0006]

According to the present invention, the set flow rate can be easily adjusted by changing the weight of the balance plate and the diameter of the water passage hole of the paddle table even if the parts vary, so that the lead can be surely read. The switch can be turned ON / OFF.

[0007]

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

FIG. 1 is an external view of an electric instant water heater, in which 20 is a water inlet pipe, 21 is a water stop valve knob, 22 is a flow rate control valve knob, 23 is a capacity control knob, and 24 is a shower hose.
5 shows a shower head. 2 is an internal structure diagram of the electric instant water heater. 26 is a flow rate detector, 27 is a water stopcock, 28 is a flow rate control valve, 29 is a volume control volume, 30 is a tank, 31 is a control circuit, 32 is a thermistor. Indicates. As shown in FIG. 3 and FIG. 4, the water flowing in from the water inlet pipe 20 is heated in the tank 30 having the heater 33 through the flow rate detector 26, the water stop valve 27, and the flow rate control valve 28, and the hot water outlet pipe 3
It flows out from the shower head 25 via the shower hose 24 connected to the No. 4 unit. As for the hot water temperature at this time, the heat generation amount 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 of the tank 30 is adjusted in advance with the volume control knob 23, and the thermistor 32 for detecting the hot water temperature of the tank 30 and the volume control volume 29.
The control circuit 31 compares the resistance values of the above items 1 to 3 to control the energization rate of the heater 33 to adjust the hot water temperature to a desired value. In addition, the tank 30 is provided with a protector 35 that prevents heating in the event of an abnormality. The flow rate detector 26
5 shows the OFF state of the reed switch 36, 37 is a glass tube, 38 is a lead piece, and 39 is a contact portion. FIG. 6 shows the operating principle when the reed switch 36 is in the ON state. When the magnet 40 is brought close to the reed switch 36, the magnetic field 41N-S of the magnet 40 is reached.
The lead piece 38 is magnetized by the
Are attracted to each other and come into contact with each other to be turned on. When the magnetic field is erased, it turns off. This will be described with reference to FIGS. 7 and 8. The figure shows the flow rate detector 26, and in FIG. 7, the reed switch 36 is in the OFF state when the flow rate is stopped. FIG. 8 shows the reed switch 3 in the state of the flow rate.
6 is in the ON state. The paddle part 42 is a paddle 4
3, a magnet 40, a balance plate 45, a pin 46, and a paddle stand 47, and the weight can be changed by changing the thickness of the balance plate 45. The weight (rotation torque) from the pin 46 serving as a fulcrum and the paddle stand. By changing the diameter of the water passage hole 47, the ON / OFF set flow rate can be easily adjusted. Further, when the reed switch 36 is turned on by the magnet 40 and then turned off, delay of the off point of the reed switch 36 due to the magnetic field of the magnet 40 can be prevented.
As the material of the balance plate 45, brass or stainless steel is used so that it is not easily corroded by water.

[0009]

As described above, in the electric instant water heater equipped with the flow rate detector of the present invention, the set flow rate can be easily changed by adjusting the weight of the balance plate and the diameter of the water passage hole. It is possible to provide an electric instant water heater that reliably turns the switch on and off.

[Brief description of drawings]

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

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

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

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

FIG. 5 is a reed switch used in the same embodiment, showing an OFF state.

FIG. 6 is a diagram showing the principle of operation of the reed switch used in the same embodiment, showing the ON state.

FIG. 7 is a view showing a flow rate detector OFF state of the same embodiment.

FIG. 8 is a view showing the flow rate detector ON state 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 flow rate detector diagram of a conventional example.

[Explanation of symbols]

 33 heating heater 30 tank 20 water inlet pipe 34 hot water outlet pipe 26 flow rate detector 28 flow rate control valve 27 water stopcock 35 protector 36 reed switch 31 control circuit 32 thermistor 29 capacity control volume 42 paddle part 40 magnet 45 balance plate 47 paddle unit 48 Water passage

Claims (3)

[Claims] 1. A tank having a heater, a water inlet pipe and a hot water outlet pipe communicating with the tank, a flow rate detector provided in the water inlet pipe, a flow rate control valve, and a water stop valve, and the flow rate detector is provided. Is a paddle table that forms water passages, a paddle section that is provided on the upper part of the paddle table and that rotates about one point of the paddle table, a magnet and balance plate that are provided in the paddle section, and when the magnet approaches. An electric instant water heater having a reed switch for energizing a heater, and adjusting the set flow rate by changing the weight of the balance plate and the diameter of the water passage hole. 2. The electric instant water heater according to claim 1, wherein the balance plate is made of corrosion-resistant brass. 3. The electric instant water heater according to claim 1, wherein the balance plate is made of corrosion-resistant stainless steel.