JPS6261854B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric water heater that can easily provide boiling water for making coffee, tea, or instant food in a general household or an office for a small number of people.

Traditionally, hot water obtained from water heaters and water heaters has been regulated at around 85 degrees Celsius in order to ensure safe operation of the equipment. This is because boiling water inside the device causes the pressure inside the device to rise abnormally, which is dangerous. Therefore, the temperature of hot water obtained from the water heaters and the like is too low to be suitable for making coffee, tea, or instant foods. For this reason, hot water from a water heater is usually transferred to a container such as a kettle and then reheated using a heat source such as gas before being used for the above-mentioned instant foods. Therefore, in order to obtain boiling water for making coffee or other instant foods, the hot water must be reheated, which is very inconvenient.In addition, it is very inconvenient to prepare instant foods or other foods or beverages that use boiling water. The drawback was that it took a long time.

The present invention eliminates the above-mentioned drawbacks and makes it possible to supply boiling water at any time by heating water heated to around 85°C to a temperature of around 95°C or higher by reheating it during the hot water extraction process. In addition, the present invention provides an electric water heater with a novel structure that can be used safely in the same way as a normal water heater except when dispensing boiling water. , 1 is the main body of the proposed water heating device, 2 is a hot water tank housed and fixed in the main body 1 via a heat insulating material 3, 4 is a water supply pipe, and one of them is a water supply tank 5.
The other end is connected to the water pipe 6 through the main body 1 and connected to the tank 2 at the bottom of the hot water tank 2.
Connected to allow communication with the inside. Reference numeral 7 denotes a water conduit pipe bent into an L-shape, and is connected to the water supply pipe 4 in the hot water tank 2 with the discharge port 7a positioned at the center of the bottom surface of the hot water tank 2. Reference numeral 8 is a drain pipe connected to the lower part of the water supply pipe 4 and pulled out below the main body 1, and 9 is a drain pot, which is closed except when draining water from the hot water tank 2. Reference numeral 10 denotes a heating element that is installed in a watertight structure on the bottom plate 2a of the hot water tank 2 with a buffer material 10a made of a material having excellent heat resistance such as silicone resin interposed therebetween. On the surface, from the outer periphery toward the center position, there is an empty firing detection sensor 11,
As shown in Fig. 3, the heating heater 12, auxiliary heater 13, and water intrusion detection sensor 14 are printed individually and in a spiral shape, and a ceramic insulating protective layer is coated on the surface and then heated to high temperature. This heating body 10 is heated by a heater 12 that generates heat when energized, thereby raising the water temperature in the hot water tank 2. The dry firing detection sensor 11 is configured by, for example, inserting a resistor and a constant voltage diode in series between the output terminals of a constant voltage power supply circuit connected to a power source, and comparing a set reference voltage with the output of the constant voltage diode. The output of the connection point between the resistor inserted in series between the output terminals of the voltage regulator diode and the thermistor with positive characteristics is input to the other input terminal of the comparator. The output terminal has a well-known configuration in which the base of a transistor inserted in series with a relay is connected to the output terminal of a constant voltage power supply circuit. When the temperature reaches approximately 150° C.), the output signal from the comparator turns off the transistor, de-energizes the relay, and opens its normally open contact 11a. That is, the heating body 1 heated by the heating heater 12
When 0 reaches a predetermined temperature, detect the temperature,
This detection signal de-energizes a relay (not shown) to open the normally open contact 11a and open the energizing circuit of the heater 12. Also, water entry detection sensor 1
4 is constructed in the same manner as the empty firing detection sensor 11, and is attached to the center of the heating element 10 facing the discharge port 7a of the water pipe 7, and is normally heated by the auxiliary heater 13, and the hot water tank 2 When the temperature of the water inside or the heating element 10 reaches a predetermined temperature (approximately 40° C.), a relay (not shown) inside the sensor 14 is de-energized to open the normally open contact 14a. Reference numeral 15 denotes a hot water temperature detection sensor having a temperature sensing part protruding from the upper part of the hot water tank 2 into the tank 2 to detect hot water in the hot water tank 2. , 14, when the water temperature reaches a predetermined temperature (approximately 85 degrees Celsius) or higher, the temperature is detected, and the detection signal de-energizes a relay (not shown) in the sensor 15 to keep it open. While opening the contact 15a, a normally closed contact 15b is inserted into the energizing circuit of the reheating device 16, which will be described later.
is closed, the energizing circuit of the heating heater 12 is opened, and a rise in the water temperature is prevented. As shown in FIG.
A guide cylinder 17 that hangs down to approximately the center of the tank 2 with the open end of the bottomed cylinder fixed to the top of the tank 2, and a cylindrical ceramic loosely fitted inside the guide cylinder 17. The guide tube 17 has a hot water inlet 17 at the top.
The required number of holes a are provided in the heating tube 18, and as shown in the exploded view of FIG.
and a reheating heater empty firing detection sensor 20 are built-in. This dry firing detection sensor 20 is constructed in the same manner as the above-mentioned sensors 11, 14, and 15, and has a predetermined temperature (approximately 150
℃), the temperature is detected, and a relay (not shown) in the sensor 20 is de-energized based on the detection signal to open the normally open contact 20a and open the energizing circuit of the reheating heater 19. In this way, the energization circuits of the heating heater 12 and the reheating heater 19 are connected to the respective sensors 15 and 14 by the detection signals of the hot water temperature detection sensor 15 and the water entry detection sensor 14.
Normally open contact 1 is activated by operating the relay (not shown) inside.
By opening and closing the normally closed contacts 5a, 14a and the normally closed contacts 15b, the energizing circuits of the respective heaters 12, 19 cannot be energized at the same time. The heating tube 18 loosely fitted into the guide tube 17 is
As shown in FIG. 2, the tip is fastened and held on the mounting seat 2b at the top of the hot water tank 2 via the collar plate 21, with the tip maintained at a required distance from the bottom surface of the guide tube 17. A hot water conduit 22 is connected to the heating tube 18 via a connector 23 fixed to the upper surface of the main body 1, and the tip thereof passes through the water supply pot 5 and is drawn out onto the sink 24. 22a is a discharge port of the hot water conduit 22.

The main body 1 is installed in a box 25 below the sink 24.

In the figure, 11', 12', 13', 14', 19',
Reference numerals 20' indicate terminals of the empty firing detection sensor 11, heating heater 12, auxiliary heater 13, water intrusion detection sensor 14, additional heating heater 19, and additional heating heater empty firing detection sensor 20, and 26a, 2
6b is heat-resistant packing for preventing water leakage.

Next, the operation of the above configuration will be explained. First, the water supply pot 5 is opened to supply tap water from the water supply pipe 4 into the hot water tank 2, and when the hot water tank 2 is filled with water, the water supply pot 5 is closed. Next, the power plug 27 of the water heater is connected to a power source (outlet) and the operation switch 28 is turned on. Therefore, the auxiliary heater 13 is immediately energized, and since the hot water tank 2 is filled with cold water, the hot water temperature detection sensor 15 uses a signal that detects the temperature to energize a relay (not shown) to keep it normally open. Contact 1
5a to close the energizing circuit of the heater 12. Therefore, the heater 12 generates heat and heats the heating element 10 to heat the water in the hot water tank 2, and the auxiliary heater 13 heats the water entry detection sensor 14. Note that when the normally open contact 15a is closed by the detection signal from the hot water temperature detection sensor 15, the normally closed contact 15b is opened and the energizing circuit of the reheating heater 19 is opened. Therefore, heating heater 1
2 and the reheating heater 19 are not energized at the same time. Furthermore, when the water entry detection sensor 14 reaches a predetermined temperature (approximately 40° C.) due to heat generated by the auxiliary heater 13, a signal that detects the temperature is set to de-energize a relay (not shown) and open its normally open contact 14a. ing. And heating heater 12
When the water temperature in the hot water tank 2 reaches a predetermined temperature (approximately 85°C) or higher by energizing, the water temperature detection sensor 1
5 detects the temperature and uses the detection signal to de-energize a relay (not shown) to open the normally open contact 15a, and conversely, the normally closed contact 15b closes to open the energizing circuit of the heater 12 and adjust the water temperature. prevent the rise of At this time, only the auxiliary heater 13 remains energized, so the water entry detection sensor 1
4 does not operate because it continues to be heated above the operation start temperature (approximately 40°C), so the normally open contact 14a continues to open and opens the energizing circuit of the additional heating heater 19.
The supply of electricity to the reheating heater 19 is blocked.

Next, when obtaining boiled water, first open the water supply pot 5, and tap water flows from the water supply pipe 4 through the water conduit pipe 7 into the hot water tank 2. The water that has flowed into the heating element 10 from the discharge port 7a of the water pipe 7
The water flows down to approximately the center of the water body, cooling the water intrusion detection sensor 14 located at this position. Therefore, when the water inflow detection sensor 14 is rapidly cooled by the inflowing water to the temperature at which it starts operating, the sensor 14 detects the temperature and uses the detection signal to energize a relay (not shown) to keep it normally open. The contact 14a is closed. By closing this normally open contact 14a, the energizing circuit of the reheating heater 19 is closed, the reheating heater 19 generates heat, and the heating tube 1
Heat 8. Therefore, the hot water heated to a predetermined temperature (approximately 85° C.) in the hot water tank 2 by the inflow of tap water is successively pushed up toward the hot water conduit 22 side.
That is, the hot water in the guide tube 17 is heated by the heating tube 18 and becomes boiling water of about 95 to 99 degrees Celsius, and is fed into the hot water conduit 22. The hot water flows into the guide cylinder 17 from the inlet 17a, flows down the outside of the heating pipe 18, flows into the inside of the heating pipe 18 from the lower side, and is sent into the hot water conduit 22. While flowing from the outside to the inside of the heating tube 18, this hot water is heated by the heating tube 18, becomes boiling water, and is discharged from the hot water conduit 22 through its discharge port 22a. In this way, the hot water conduit 22
The boiling water flowing out from the outlet 22a is used to make coffee or tea or to cook instant food. When the boiled water is no longer used, the feed pot 5 is closed to cut off the feed to the hot water tank 2. When the supply is cut off, the water entry detection sensor 14
is released from the state of being cooled by the inflow water, and is immediately heated by the auxiliary heater 13, which is constantly energized, to reach a predetermined temperature (approximately 40°C). As a result, the water entry detection sensor 14 de-energizes a relay (not shown) in response to a signal detecting a predetermined temperature, opens its normally open contact 14a, opens the energizing circuit of the reheating heater 19, and stops energizing the reheating heater 19. cut off. At this time, if the water temperature in the hot water tank 2 falls below a predetermined temperature (approximately 85 degrees Celsius), the water temperature detection sensor 15 uses a signal that detects the temperature to energize a relay (not shown) and close its normally open contact. 15a
is immediately closed to close the energizing circuit of the heater 12, and conversely, the normally closed contact 15b opens to open the energizing circuit of the reheating heater 19. As a result,
The heating heater 12 immediately generates heat and the hot water tank 2
Heats the water inside to a specified temperature. Further, the power supply to the reheating heater 19 is cut off by opening the normally closed contact 15b. In this way, when the power supply to the heating heater 12 is started, the reheating heater 1
The normally open contact 14a and the normally closed contact 15b provided in the energizing circuit of No. 9 immediately open and close to open the energizing circuit of the reheating heater 19. Switching can be performed immediately and reliably, and simultaneous energization of both heaters 19 and 12 can be prevented. Therefore, for example, there is no need to change the contract current due to an increase in power consumption in a general household, and furthermore, it is possible to prevent an increase in power consumption due to simultaneous energization.

In addition, after using boiled water, if the water temperature in the hot water tank 2 is higher than a predetermined temperature (approximately 85 degrees Celsius), the auxiliary heater 13 and the water entry detection sensor 14 are activated based on the water temperature.
is immediately heated to a predetermined temperature, and the normally open contact 14a is opened via a relay (not shown) in response to a signal that detects the temperature, and the reheating heater 19 is activated.
immediately open the energized circuit. At this time, since the hot water temperature detection sensor 15 does not operate, the energizing circuit of the heating heater 12 remains open, and the heating heater 12 remains open.
2 is also not energized.

In addition, when using the water heater of the present invention as a normal water heater without requiring boiled water, another water supply pipe (not shown) is connected in the middle of the hot water conduit 22, and when in use, this water supply pipe (not shown) is connected. The water supply socket of the water supply pipe (not shown) and the water supply socket 5 of the water heater of the present invention are simultaneously opened, and the hot water about to flow out from the outlet 22a of the hot water conduit 22 is replaced with the water supplied to the hot water pipe 22 from the water supply pipe (not shown). and appropriate temperature (e.g. 35-45℃)
The discharge port 22a of the hot water conduit 22 is mixed until
The present invention can also be achieved by obtaining hot water at an appropriate temperature from

As described above, the present invention includes a reheating device near the hot water outlet in the hot water tank that can reheat the hot water stored at an appropriate temperature in the hot water tank when it is used to obtain boiling hot water, This reheating device is configured to easily convert hot water into boiling water so that boiling water can be obtained at any time, so it has the following effects.

The water heating device of the present invention is configured by vertically disposing the reheating device with a built-in reheating heater on the top of the hot water tank, so that the hot water in the hot water tank can be easily boiled by the reheating device. can be converted to .

The circular flat heating element is attached to the bottom plate of the hot water tank in close contact with the bottom plate in a watertight structure with no space between the heating element and the bottom plate, which prevents cold water from accumulating in the hot water tank. Since the water supplied to the hot water tank can be heated efficiently, it is possible to keep the water temperature in the hot water tank almost constant at the top and bottom of the tank. It is possible to reheat hot water effectively and without waste with little electricity.

Furthermore, the heating elements are arranged individually and in a spiral shape on the surface of a circular ceramic plate in the order of dry firing detection sensor, heating heater, auxiliary heater, and water intrusion detection sensor from the outer periphery toward the center. Since the heating element is constructed in a separate process, it is possible to manufacture only the heating element in advance, and the lead wires for each sensor can be concentrated in one place, so the lead wires can be Assembling the water heater can be carried out efficiently, such as easy wiring work.

Furthermore, in the water heating device of the present invention, the water intrusion detection sensor placed at the center of the heating element is normally heated above the operation start temperature by the auxiliary heater placed around it, thereby preventing energization of the additional heating heater. When reheating hot water, conversely, when the cold water that flows into the hot water tank from the water conduit pipe cools it down to the operating start temperature, it immediately operates and energizes the reheating heater, and at the same time the hot water temperature detection sensor Since it is configured to open the energizing circuit of the heating heater, when reheating hot water, it reliably prevents simultaneous energization of the reheating heater and the heating heater, and reduces the contract current due to the increase in power consumption due to simultaneous energization. There is no such thing as changing the
Power consumption can be reduced.

Moreover, the above-mentioned water inflow detection sensor can be operated reliably by simple heating and cooling means using an auxiliary heater and cold water, and moreover, it can be placed at the center of the ceramic plate on which the heating heater is installed. It can be easily installed facing the discharge port of the water conduit pipe without causing any hindrance to the installation of the heater.

As explained above, the water boiling device of the present invention heats the water intrusion detection sensor with the auxiliary heater or the water flows into the hot water tank without using a special switch mechanism when energizing or cutting off the reheating heater. By cooling the reheating heater with cold water, it is possible to control the energization of the reheating heater with a simple structure. Since the heaters can be assembled individually and installed without creating a space on the bottom of the tank, the manufacturing and installation of the heating element becomes easy, and the water heater itself can be manufactured with a simple structure and at low cost. ,On top of that,
Heating for cooling using a heating element has many excellent effects, such as efficient heating without creating a pool of cold water in a hot water tank, and the ability to quickly and easily produce boiling water with little electricity.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the installed state of the electric water boiler of the present invention, Fig. 2 is a longitudinal cross-sectional view of the device, Fig. 3 is a cross-sectional plan view of the heating element, and Fig. 4 is a heating element built in the heating tube. FIG. 5 is a developed diagram of the reheating heater and the reheating heater emptiness detection sensor, and is a block diagram of the control circuit. 2... Hot water tank, 7... Water pipe, 10... Heating body, 12... Heater, 14... Water entry detection sensor, 15... Hot water temperature detection sensor, 17...
Guide tube, 18... heating tube, 19... reheating heater, 22... hot water conduit.

Claims (1)

[Claims] 1. A hot water pipe 22 for discharging hot water is connected to the upper side of the hot water tank 2, and a water supply pipe 4 communicating with the hot water pipe 7 is connected to the lower side, so that the water supplied to the hot water tank 2 is heated by a heating heater. In the water heating device, on the bottom plate 2a in the hot water tank 2,
A dry heating detection sensor 11 for preventing dry heating of the heating heater 12 from the outer circumferential side toward the center on the surface of the disc-shaped ceramic plate 10b, the heating heater 12 for heating the cold water in the hot water tank 2, and an auxiliary heating sensor 11 for preventing dry heating of the heating heater 12. The heater 13 and the water entry detection sensor 14, which is always heated to a predetermined temperature by the auxiliary heater 13, are arranged individually and in a spiral shape, and the surface of the ceramic plate 10b is protected by ceramic insulation. A circular flat heating body 10 formed by coating with a layer is attached watertightly to the bottom plate 2a, and a discharge port 7a is placed on the water ingress detection sensor 14 provided on the heating body 10 at a predetermined distance from the water ingress detection sensor 14. The water supply pipes 7 are connected to the water supply pipe 4, and the water supply pipes 7 are connected to the water supply pipe 4, and at the top of the hot water tank 2, there is a bottomed cylindrical guide pipe 17 with a hot water inlet 17a opened at the top.
is installed vertically, and a reheating heater 1 is installed inside this guide tube 17.
A heating pipe 18 containing a heating pipe 9 is connected to the hot water supply pipe 22 and loosely fitted therein, and furthermore, a heating pipe 18 is installed at the upper part of the hot water tank 2 so that when the cold water is heated to a predetermined temperature by the heating heater 12, the heating heater is energized. A hot water temperature detection sensor 15 is installed that opens the contact 15a on the circuit side and closes the contact 15b on the energized circuit side of the reheating heater. The energizing circuit of the reheating heater 19 is opened by the water intrusion detection sensor 14 which has been heated to a temperature higher than the operation start temperature.
When reheating hot water that has been heated to a predetermined temperature, the reheating heater 1 is activated by a water inflow detection sensor 14 that operates by detecting cold water flowing into the hot water tank 2 from the water pipe 7.
The energizing circuit of 9 is closed to reheat the hot water, and furthermore, when the hot water temperature drops below a predetermined temperature during reheating of the hot water, the energizing circuit of the heating heater 12 is closed by the hot water temperature detection sensor 15. An electric water boiling device characterized in that the energizing circuit of the reheating heater 19 is opened when the reheating heater 19 is opened.