JP3531287B2 - Electric instantaneous water heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric instantaneous water heater used for a hot water supply shower. 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 through 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 via the shower hose 8. The water inlet pipe 1 is located on the lower inner surface of the tank 6, the tapping pipe 7 is inserted from the upper part of the tank 6 and positioned on the lower inner surface, and the thermistor 11 is
It is provided below the tank 6 and inserted into the tapping pipe 7. The temperature of the hot water flowing out of the shower head 9 can adjust the amount of heat generated by the heater 5 depending on the water temperature and the flow rate. Therefore, in order to obtain a comfortable hot water temperature, the temperature of the hot water in the tank 6 is adjusted in advance by the capacity adjusting volume 10 to the desired hot water temperature, and the resistance of the thermistor 11 and the resistance of the volume adjusting volume 10 are compared by the control circuit 12. Then, the duty ratio of the heater 5 is controlled to adjust the temperature of the hot water to a desired temperature. Incidentally, the tank 6 is provided with a protector 13 as a final safety device for preventing heating in an abnormal state. The flow detector 2 shown in FIG. 11 includes a paddle unit 14 and a reed switch 15, and the paddle unit 14 includes a magnet 1
6, a paddle 17, a paddle stand 18, and a pin 19. When the paddle 17 on which the magnet 16 is mounted moves toward the reed switch 15 with the pin 19 as a fulcrum by the flow rate from the water inlet pipe 1, the magnetic field of the magnet 16 is generated. As a result, the reed switch 15 is turned on, and when the flowing water stops, the paddle 17 on which the magnet 16 is mounted moves toward the water inlet pipe 1 with the pin 19 as a fulcrum, and the reed switch 15 is turned off.
The paddle 17 is turned on by the impurities contained in the water at the fulcrum of the pin 19 even if the running water is stopped.
When an abnormality occurs such as when the heater is stuck in a state and does not operate smoothly or when the contact point of the reed switch 15 is in a welded state, the heater 5 is continuously energized, the temperature of the hot water in the tank 6 becomes a boiling state, and Steam-like hot water gushes from the head 9. Thereafter, the protector 13 of the final safety device operates, but there is a danger of burns. When abnormalities occur, the abnormally heated hot water pools at the top and boils,
The thermistor 11 provided at the lower part of the tank 6 has a delayed operation, and at the time of operation, since the upper part of the tank 6 is already boiling, it does not serve as a protection device at the time of abnormality. In the water flowing state, the hot water temperature is controlled by the thermistor 11 via the control circuit 12, and a comfortable hot water temperature is obtained. However, in the above-described conventional configuration, even when the running water is stopped, the paddle 17 is fixed in the ON state by the impurities contained in the water at the fulcrum of the pin 19, and the paddle 17 is smoothly operated. When an abnormality occurs, for example, when the operation is not performed or when the contact point of the reed switch 15 is in a welded state, the heater 5 is continuously energized, the temperature of the hot water in the tank 6 becomes a boiling state, and steam-like hot water is ejected from the shower head 9. .
Thereafter, the protector 13 of the final safety device operates, but there is a danger of burns. When an abnormality occurs, the abnormally heated hot water pools at the top and boils, so that the operation of the thermistor 11 provided at the lower part of the tank 6 is delayed. At the time of operation, the upper part of the tank 6 is already boiling. It is not a safety device for burns but a protector 13 of the final safety device
But works first. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an electric instantaneous water heater configured to operate a thermistor as a safety device against burns in an easily generated abnormal state. [0005] In order to achieve the above object, the present invention provides a tank for storing water supplied from a water inlet pipe , and a water disposed in the tank and keeping the stored water at a predetermined temperature. heating
A heating heater , a hot water outlet pipe having a hot water inlet at an upper part in the tank, and sending out hot water in the tank heated by the hot water heater from the hot water inlet, a flow detector and a flow rate provided in the water inlet pipe A control valve and a water stopcock, a protector connected to the heater to detect abnormal heating in the tank, a thermistor to detect the temperature of the hot water in the tank, and a capacity adjusting volume for setting the hot water temperature in the tank. An outlet of the water inlet pipe is located on an inner surface of a lower portion of the tank;
Entering from the top of the tapping tube is positioned in the tank upper inner surface
It is configured to be inserted into the gate , and the temperature of the hot water flowing through the tapping pipe during running water
To detect the temperature of hot water in the tank when running water is stopped.
It was done. According to the present invention, the paddle is turned on by the impurities contained in the water at the fulcrum of the pin even when the running water is stopped.
The thermistor installed at the top of the tank detects the temperature of the hot water without any delay even if abnormalities occur, such as when it sticks in a state and it does not work smoothly or when the contacts of the reed switch are in a welded state, etc. By controlling the energization of the heater, the temperature of the hot water in the tank does not rise above the set temperature of the thermistor, and the hot water does not blow out from the shower head, thus ensuring safety. The thermistor is a hot water temperature control device during running water, and serves as a safety device against burns in the event of an abnormality. An embodiment of an electric instantaneous 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 an internal structural view of the electric instantaneous water heater, 26 is a flow detector, 27 is a water stopcock, 28 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. Is shown. As shown in FIGS. 3 and 4, the water flowing from the water inlet pipe 20 passes through a flow detector 26, a water stopcock 27, and a flow control valve 28, is heated in a tank 30 having a heater 33, and is discharged from the hot water pipe 3.
4 flows out of the shower head 25 via the shower hose 24 connected to the shower head 4. The inlet pipe 20 is provided with a tank 30
Located on the lower inner surface, the tapping pipe 34 is inserted from the lower part of the tank 30 and located on the upper inner surface, and the thermistor 32 is
It is provided above the tank 30 and inserted into the tapping pipe 34. The temperature of the hot water flowing out of the shower head 25 can adjust the amount of heat generated by the heater 33 depending on the water temperature and the flow rate. Therefore, in order to obtain a comfortable hot water temperature, adjust the desired hot water temperature in advance with the volume adjustment knob 23,
The resistance of the thermistor 32 for detecting the temperature of the hot water in the tank 30 and the resistance of the capacity adjusting volume 29 are compared by the control circuit 31 to control the duty ratio of the heater 33 to adjust the hot water to a desired temperature. . In addition, the tank 30 is provided with a protector 35 as a final safety device for preventing overheating at the time of abnormality. FIG. 5 used for the flow rate detector 27 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 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 contact portions 39 facing each other are separated from each other. They are sucked and come into contact with each other to be turned on. If the magnetic field is erased, it will be in the OFF state. This will be described with reference to FIGS. The figure shows the flow detector 26, and FIG. 7 shows the reed switch 36 in the OFF state with the flow stopped. FIG. 8 shows a state in which the reed switch 36 is in the ON state while the flow rate is being increased. The paddle portion 42 is composed of a paddle 43, a magnet 40, a balance plate 45, a pin 46, and a paddle base 47. Even if running water stops, the paddle 43 is an impurity contained in water at a fulcrum of the pin 46, and The thermistor 32 provided on the upper part of the tank 30 does not delay operation even if an abnormality such as a case where it is fixed in the ON state and does not operate smoothly or a case where the contact point of the reed switch 36 is in a welded state occurs, without delay of operation. Is detected, the energization of the heater 33 is controlled, and the tank 3
The internal hot water temperature does not rise above the set temperature of the thermistor 32, and hot water does not blow out from the shower head 25, so that safety can be ensured. The thermistor 32 is a hot water temperature control device during running water, and serves as a safety device against burns in the event of an abnormality. As described above, the electric instantaneous water heater according to the present invention, even when the running water is stopped, is fixed to the fulcrum of the pin by the impurities contained in the water and the paddle is fixed in the ON state, so that the paddle is smoothly turned on. The thermistor installed at the top of the tank detects the temperature of the hot water and controls the energization of the heater without delay, even if an abnormality occurs, such as when the heater does not work or when the contacts of the reed switch are welded. However, the temperature of the hot water in the tank does not rise above the set temperature of the thermistor, and hot water does not blow out from the shower head. The thermistor is a hot water temperature control device in flowing water, and can provide a highly safe electric instantaneous water heater that becomes a safety device against burns in the event of an abnormality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external view of an electric instantaneous water heater according to an 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 of the embodiment. FIG. 4 is a water circuit diagram of the embodiment. FIG. 5 is a reed switch diagram used in the embodiment. FIG. 6 shows an OFF state. FIG. 6 is an operation principle diagram of a reed switch used in the embodiment. FIG. 7 is a flow detector diagram of the embodiment, showing an OFF state. FIG. 8 is a flow detector diagram of the embodiment, showing an ON state. FIG. 9 is a conventional water circuit and electric circuit diagram. 10 Water circuit diagram of conventional example [FIG. 11] Flow rate detector diagram of conventional example [Description of symbols] 33 Heater 30 Tank 20 Water inlet pipe 34 Hot water pipe 26 Flow rate detector 28 Flow rate control valve 27 Water stopcock 35 Protector 36 Reed switch 31 Control circuit 32 Thermistor 29 Volume control volume

Claims (1)

(57) [Claim 1] A tank for storing water supplied from an inlet pipe , and water stored in the tank is heated to a predetermined temperature.
A heating heater , a hot water outlet pipe having a hot water inlet at an upper portion in the tank and sending out hot water in the tank heated by the heater from the hot water inlet; a flow detector provided in the water inlet pipe; A flow control valve and a water stopcock, a protector connected to the heater to detect abnormal heating in the tank, a thermistor to detect the temperature of the hot water in the tank, and a volume control volume for setting the hot water temperature in the tank. the provided, the outlet of the entering-water pipe is located at the bottom inner surface of the tank, the thermistor Tan
From click upper portion of the hot water tube is positioned in the tank upper inner surface
Is configured to be inserted into the bathing opening, the running water hot water flowing through the hot water pipe
Detects the temperature and detects the temperature of hot water in the tank when running water is stopped.
In electrical instant water heater.