JPH038763B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a water heater in which heated hot water stored in a water tank is discharged to the outside by an electric pump.

(b) Conventional technology Conventionally, for example, the water heater disclosed in Japanese Utility Model Application Publication No. 173247/1983 has been known to operate electrically when there is little water in the water tank and the water is being heated by the heater. When the pump is operated continuously to draw hot water outside, the heater is energized and continues to heat the hot water even though the hot water is gradually decreasing, so a large amount of steam fills the water tank and causes As a result, there was a drawback that this steam could leak together with the hot water being discharged, creating a dangerous situation.

(c) Problems to be Solved by the Invention The present invention provides a water heater that does not create a dangerous situation when hot water is supplied.

(d) Means for solving the problem The water heater of the present invention includes a water tank, a heater that heats the tank, and detects the temperature of water stored in the water tank to control the heater, Temperature control means for keeping warm after boiling heating;
It has an electric pump that pumps air into the water tank and brings out the water in the water tank to the outside, and a hot water switch that drives the electric pump, and when the switch is operated during boiling heating, It is designed to retain heat or cut off the power to the heater.

(e) Effect Since the present invention is configured as described above, the water tank is not filled with steam.

(F) Embodiments Embodiments of the present invention will be described based on the drawings. 1 to 3 show the configuration of the water heater of the present invention, in which 1 is a cylindrical frame, 2 is a bottomed cylindrical water tank stored in the frame and stores water;
3 is a back plate fixed to the lower part of the frame 1; 4 is an electric pump provided in the space between the bottom wall of the water tank 2 and the back plate 3 for pumping air; 5 is an electric pump with one end connected to the pump; an air vibrator whose end is connected to the upper side wall of the water tank 2 to communicate with the inside of the water tank 2;
Reference numeral 6 denotes a band-shaped heating heater fixed in close contact with the lower side wall of the water tank 2; 7, a band-shaped heat-retaining heater; 8, a frame cover fitted and fixed to the frame 1 and the upper edge of the water tank 2; 9, A first steam exhaust passage provided outside the upper part of the water tank 2 and communicating with the inside of the water tank 2; 10 is an operation button provided in the frame cover 1 and always urged upward by a spring 11; A protruding boss 12 is integrally formed on a part of the periphery, and a protruding part 13 is integrally formed on a part of the periphery, and the protruding boss 12 is provided with a pressing rod 15 to which a bag-shaped packing 14 made of a heat-resistant elastic material such as silicone rubber is fixed to the lower part. Fitted and fixed. Reference numeral 16 denotes a hot water supply switch provided near the bottom of the operation button 10, which drives the electric pump 4 by the closing operation of the protrusion 13. 17 is a decorative cover fixed to the frame 1; 18 is a hot water supply vibrator having one end connected to the bottom wall of the water tank 2 and the other end facing outside from the frame 1; 19, which is wrapped around the outer wall of the water tank 2; A first thermistor 21 with a negative characteristic fixed in the first steam exhaust passage 9 is a second thermistor with a negative characteristic fixed on the bottom wall of the water tank 2, and a second thermistor 22 with a negative characteristic is fixed in the first steam exhaust passage 9. A neon lamp 23 is a neon lamp for indicating heat preservation, 24 is a reboiling switch for boiling again during heat preservation, 25 is an operation button for the reboiling switch, and 26 is a blocker for closing the upper opening of the water tank 2. The lid body is detachably attached to the inside of the frame cover 1 and is composed of the following members.

27 is an upper plate, 28 is a lower plate fixed below the upper plate, 29 is a second steam exhaust passage constituted by a pair of upper and lower members 29A and 29B stored and fixed to the upper plate 27 and the lower plate 28, It is formed in the diametrical direction of the lid body 26, one end of which opens downward to communicate with the first steam exhaust passage 9, and the other end of which opens upward to the outside. Reference numeral 30 denotes an inner lid that is detachably attached to the lower plate 28.

Next, to explain the electrical circuit diagram in Figure 4, 3 in the diagram
1 is an AC power supply, 32 is a DC power supply, 33 to 53 are resistors, 54 to 57 are diodes, 58 and 59
is a Zener diode, 60 is a relay contact, 61 is a relay coil for driving the relay contact, 62 is a transistor, 63 is an SCR, 64 to 66 are comparators, 67 is a smoothing capacitor, 68 to 72
is a capacitor for preventing malfunction of the comparators 64 to 66. Note that the comparators 64 to 66 are temperature controlled by diodes 54 to 57, resistors 33 to 51, capacitors 67 to 72, Zener diodes 58 and 59, transistor 62, relay coil 61, relay contact 60, SCR 63, and thermistors 20 and 21. It constitutes a circuit.

Next, the operation in the above configuration will be explained.
First, fill the water tank 2 with water, close the lid 26,
AC power 31 is applied. At this time, since the water temperature is low, the resistance values of the first and second thermistors 20 and 21 are large, and the comparator 65 outputs an L signal, and the comparators 64 and 66 output an H signal. Accordingly, the transistor 62 is turned on, the relay contact 60 is closed, and the SCR 63 is turned on, power supply to the heating heater 6 and the heat-retaining heater 7 is started, and the neon lamp 22 for indicating boiling heating is turned on. Next, when the water temperature rises and the second thermistor 21 detects approximately 93°C (the water temperature is approximately 95°C), the comparator 64 outputs an L signal and turns off the SCR 63.
The power supply to the heat retention heater 7 is stopped. Then, when the water temperature further rises and boils, steam is rapidly generated and the steam temperature rises. When the steam temperature rises to about 85° C. (the water temperature at this time is about 100° C.) and the first thermistor 20 detects this, the comparator 65 outputs an H signal. Then, the potential at the connection point A becomes high, so the comparator 66 outputs an L signal, the transistor 62 turns off, the relay contact 60 opens, and the electricity to the heater 6 is stopped.
The neon lamp for keeping warm will light up. At this time, the potential of the connection point B decreases due to positive feedback by the resistor 45, so the comparator 65 holds the H signal and the comparator 66 holds the L signal. However, the steam temperature drops quickly, and the first thermistor 20 detects about 75° C. in about one minute after starting the heat retention, and accordingly, the comparator 65 outputs an L signal. Then,
In this state, the water temperature decreases and the second thermistor 21
When 93° C. is detected, the comparator 64 outputs an H signal to turn on the SCR 63 and energize the heat retaining heater 7. Thereafter, the heat insulating heater 7 is turned off when the temperature reaches about 93°C.

Next, when new cold water is added during the warming and the water temperature drops, when the second thermistor 21 detects a temperature below about 80°C (the water temperature is about 82°C), the comparator 66 outputs an H signal and the transistor 62
Turn ON to close the relay contact 60 and energize the heater 6. Thereafter, in the same way as the operation after the initial energization described above, after boiling heating is performed, the temperature is kept warm. Furthermore, even if the operating button 25 is operated to close the reboiling switch 24 during heat retention, the potential at the connection point C will drop, so the comparator 66 will output an H signal, turning on the transistor 62 and closing the relay contact 60. The heater 6 is energized. Thereafter, in the same way as the operation after the initial energization described above, after boiling heating is performed, the temperature is kept warm.

Also, if the power goes out while keeping warm and then returns,
Charge the capacitor 72 via the diode 54 until the potential difference between the connection points A and C becomes 0.6 (V),
The capacitor 72 is charged earlier than the capacitor 71, and the comparator 66 is set to L.
I am trying to output a signal. Therefore, when the power is restored during heat retention, the heat retention will be performed without boiling.

Thus, boiling heating and heat retention are performed by the above-mentioned operation, but during boiling heating, the operation button 10 is pressed.
The operation of closing the first steam exhaust passage 9 with the gasket 14, closing the hot water supply switch 16, and driving the electric pump 4 to discharge hot water from the hot water supply vibrator 18 is as follows.

That is, when the hot water supply switch 16 is closed, the voltage divided by the resistors 49 and 50 is applied to the diode 55.
and is applied via the Zener diode 58 (this applied voltage is set higher than the voltage that inverts the comparator 66 in this state), the potential at the connection point C becomes high, and the comparator 66 receives the L signal. Output, if comparator 64
If outputting an H signal, this comparator 64
also outputs an L signal. Therefore, when the relay contact 60 opens, the SCR 63 turns OFF, and the heating heater 6
Then, the power supply to the heat retention heater 7 is stopped, and the neon lamp 23 for displaying the heat retention is turned on. This means that when you draw out hot water when the hot water is running low,
This prevents a large amount of high-temperature steam generated by the heating of the heater 6 from leaking together with the hot water being discharged, and preventing the hot water from being discharged more forcefully than usual. Next, when the hot water supply switch 16 is opened to stop discharging hot water, the second thermistor 21 registers approximately 80°C.
℃ or more, the comparator 66 holds the L signal. Also, the comparator 64 outputs an L signal if the second thermistor 21 detects a temperature of about 93°C or higher, and an H signal if it detects a temperature of less than about 93°C. As a result, the heat insulating heater 7 is turned off. and,
If the second thermistor 21 detects a temperature lower than about 80°C, the comparator 66 will output an H signal, and from then on, the operation will be similar to the operation after the initial energization described above.
After heating to a boil, it will be kept warm. This is because when the water temperature reaches close to boiling, a certain amount of steam is generated due to residual heat even while operating the operation button 10 and closing the hot water supply switch 16. When shifting to heating, if the operation button 10 is continuously operated at short intervals to draw out hot water continuously, the water tank 2
This prevents the steam pressure inside the tank from becoming extremely high, causing a large amount of high-temperature steam to leak together with the hot water being discharged, and the hot water to be discharged more forcefully than usual.

Incidentally, the above operation will also be performed when the hot water supply switch 16 and the reboiling switch 24 compete with each other. That is, when the hot water supply switch 16 is closed, the voltage applied via the diode 55 and the Zener diode 58 is set to be larger than the voltage that inverts the comparator 66 during boiling heating. is connected, the comparator 66 inverts and outputs an L signal, and while the hot water supply switch 16 is closed, the power supply to the heating heater 6 and the heat retention heater 7 is stopped, as in the above operation. Become.

The present invention is not limited to the above-mentioned embodiment, but the main part of the circuit shown in FIG. You may input the output and memorize this value, and use that temperature value to determine whether or not to keep warm after the electric pump 4 is stopped. When a high temperature output is input, the electric pump 4 may be kept warm after it is stopped. Further, the temperature for determining whether or not to keep warm after the electric pump 4 is stopped may be a temperature close to the boiling point.

FIG. 5 shows another embodiment, and the same parts as those in FIG. 4 will be described using the same reference numerals. 16 is the first contact 16
In this switch, the movable contact 16C is normally in contact with the second contact 16B. 73 is a boiling end sensing thermostat disposed in the first steam exhaust passage 9; 74 is a water tank 2;
This is a heat retention thermostat installed on the bottom wall of the building.

To explain the operation of this configuration, first, since the water temperature is low, each thermostat 7
3 and 74 are closed, and the heating heater 6 and the heat-retaining heater 7 are energized. In this state, when the water temperature rises, the heat retention thermostat 74 opens, and then the boiling end sensing thermostat 73 opens. Thereafter, the temperature is maintained by the operation of the heat-retaining thermostat 74.

Thus, boiling heating and heat retention are performed by the above-mentioned operation, but during boiling heating, the operation button 10 is pressed.
When the first steam exhaust passage is closed by the packing 14 and the movable contact 16C of the hot water supply switch 16 is connected to the first contact 16A, the power to the heater 6 is stopped and the electric pump 4 is energized. Hot water is drawn out from the hot water supply vibrator 18. At this time, the heat-retaining heater 7 is turned on and off by the heat-retaining thermostat 74, but the amount of heat generated by the heat-retaining heater 7 is small and no abnormal steam is generated. Next, when the pressure on the operation button 10 is released, the movable contact 16C of the hot water supply switch 16 returns to the second contact 16.
B, and the heater 6 is energized.

In the embodiments shown in FIGS. 4 and 5, a heating heater and a heat-retaining heater are provided, but a single heater may be used to control the energization rate and perform boiling heating and heat-retaining.

(g) Effects of the Invention Since the present invention is configured as described above, even if hot water is supplied during boiling heating, steam leaks along with the hot water that is discharged to the outside, and hot water is discharged more forcefully than usual. You can prevent this from happening.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the water heater of the present invention, FIG. 2 is a sectional view, FIG. 3 is a sectional view of the main parts, FIG. 4 is an electric circuit diagram, and FIG. It is an electrical circuit diagram. 2... Water tank, 4... Electric pump, 6... Heater, 7... Heat retention heater, 16... Hot water supply switch.

Claims (1)

[Claims] 1. A substantially sealed water tank that stores water, a heater that heats the water tank, and a boiling heating system that detects the temperature of the water stored in the water tank and controls the heater. After the water is heated, the hot water supply system includes a temperature control means for keeping the water warm, an electric pump for pressurizing air into the water tank and discharging the water in the water tank to the outside, and a hot water supply switch for driving the electric pump. A water heater, characterized in that when the switch is operated during boiling heating, the water heater is kept warm or the heater is cut off. 2. The water heater according to claim 1, wherein the water supply switch has two fixed contacts, one of which is connected to the heater and the other to the electric pump. 3. A signal from the hot water supply switch is output to the temperature control means, and when the hot water supply switch is operated, the temperature control means maintains the temperature or turns off the power to the heater. The water heater described in item 1. 4. The temperature control means detects the temperature of the water at any time from when the electric pump is driven until it is stopped, and if it is less than a predetermined temperature, after the electric pump is stopped,
4. The water heater according to claim 3, wherein the water heater performs boiling heating and, if the temperature is higher than a predetermined temperature, heat retention is performed.