JPS62129018A - Electric pot - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric water heater such as a jar pot for boiling water and keeping it warm in general households.

2. Description of the Related Art As shown in FIGS. 4 and 6, a conventional electric water heater of this type includes a cylindrical container 1 with a bottom, a heating element 2 for heating water contained in the container 1, and a heating element 2 for heating water contained in the container 1. , a first thermostand 3 attached to the bottom of the container 1 and connected in series with the heating element 2; and a first thermostand 3 attached near the heating element 2 and connected in series with the first thermostat 3. second to be done
a thermostat 4, an outer case 5 that extends around the outer periphery of the container 1, and a lid body 6 that covers the upper opening of the outer case 5;
It consisted of a water quantity display tube 7 communicating with the container 1 at the upper and lower portions and extending in the vertical direction. With this configuration, when there is water in the container 1, the temperature of the water is controlled by the first thermostat 3, while when there is no water in the container 1, the temperature of the water is controlled by the first thermostat 3, which is installed near the heating element 2. Generally, the thermostat 4 of 2 would stop supplying electricity to the heating element 2 when the temperature reached a high temperature. It has also been common to inform the user of the water level in the container 1 using the water level display tube 7. However, with this configuration, if the user turns on the water level display tube 7 without noticing that there is no water in the container 1, in order to detect that there is no water, the heating element 2 needs to be energized and the second It was necessary to reach a temperature at which the thermostat 4 would operate. Moreover, the second thermostand 4 was set at an operating temperature that would normally not operate when water was present, and the temperature was quite high. Furthermore, the display of the water volume on the water volume display tube 7 is difficult to read, and as it is, a lot of heat is radiated from the water volume display tube 7, and as a result, a lot of electricity is required to keep the water warm. With such a conventional configuration, the display of the amount of water on the water amount display tube 7 is difficult to read, and there is also a problem that a lot of heat is radiated from the water amount display tube 7, so that the amount of electric power required to keep the hot water is also large. there were.

The present invention solves these problems by reducing the amount of water,
The object is to provide an electric water heater that can be measured and displayed via the parameter pressure.

Means for Solving the Problems In order to solve the above problems, the electric water heater of the present invention has the following features:
A cylindrical container with a bottom, a heating element that heats water contained in the container, a water pipe connected to the container at the lower part and extending in the vertical direction, and a water pipe provided so as to close the upper end of the water pipe. The system is constructed of a pressure detector that detects the pressure inside the water pipe, and display means that displays numbers or a level meter according to the output of the pressure detector.

Function According to the above configuration, the amount of water can be continuously measured and displayed using the parameter called pressure, so the water amount can be easily displayed and the water pipe can be shortened to reduce heat radiation. Therefore, the power required to keep hot water can be reduced, and as a result, it is possible to provide an electric water heater that is easy to use and consumes less power.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1 to 3. In FIGS. 1 to 3, the same parts as in FIG. 4 shown in the conventional example are given the same numbers, and the explanation thereof will be omitted.

FIG. 1 shows a circuit diagram of an electric water heater according to an embodiment of the present invention, and 8 is a microcomputer, and this microcomputer 8 is a CPU.

The so-called one-chip microcomputer 09, which is composed of ROM, RAM, input/output board, etc., is a pressure detector, and here a semiconductor pressure sensor having a piezoresistive effect is used. In this case, the resistance depends on the pressure,
It is sufficient that the voltage fluctuates, and the present invention is not limited to this. This pressure detector 9 is connected to an input port of the microcomputer 8 via an A/D converter 1o.

As a result, the pressure signal from the pressure detector 9 is converted into a binary code and read into the microcomputer 8.

11 is an AC power supply, and this AC power supply 11 generates heat, etc.
8 A series circuit of the body 2, the second thermostat 4, and the relay contact 12 is connected, and a signal from the output port of the microcomputer 8 causes current to flow through the relay coil 14 through the transistor 13, so that the relay contact 12
・16 to 18 are LEDs, these LED1
5 to 18 are connected to the output port of the microcomputer 8, and are turned on in response to a signal from the pressure detector 9.

A temperature sensor 19 is connected to an input port of the microcomputer 8 via an A/D converter 2o.

FIG. 2 is a partially sectional front view of an electric water heater according to an embodiment of the present invention. In this FIG. 2, 21 is a water pipe, and this water pipe 21 is connected at the bottom of the container 1 and extends in the vertical direction, and the upper end of this water pipe 21 is closed by a pressure detector 9. . When water is poured into the container 1, pressure is applied to the pressure detector 9 due to the water pressure.

Next, the operation of the electric water heater configured as described above will be explained.

FIG. 3 shows a flowchart of the program stored in the ROM in the microcomputer 8, and the operation will be explained according to the steps of the program shown in this flowchart. First, in step 1, the pressure P of the pressure detector 9 is determined.

Then, in step 2, the temperature T of the temperature sensor 19 is measured. is measured, and in step 3 it is determined whether or not the heating element 2 is energized, and if it is energized, step 4
Calculate P-AT0+B and correct the temperature in step 6.
Proceed to. If the heating element 2 is not energized in step 3, the temperature is corrected by calculating P=CTo×B in step 6, and the process proceeds to step 5. In step 5, the LEDs 15 to 18 are lit according to the value of P, and if the temperature is high in step 7, the power to the heating element 2 is stopped in step 8, and in step 1
Return to If the temperature is low in step γ, the heating element 2 is energized in step 9 and the process returns to step 1.

In this way, the amount of water in the container 1 can be displayed by changing the temperature correction of the pressure depending on when the heating element 2 is energized and when it is not energized.

In the above embodiment, an LED level meter is shown, but it may be a numerical value or a liquid crystal.

Effects of the Invention As described above, according to the present invention, the amount of water can be measured continuously using a parameter called pressure, and it can be displayed. In this way, heat radiation can be reduced, so the power required to keep the water warm can be reduced, and since the pressure detector is installed at the top of the water pipe, it does not come into direct contact with the water, making it easy to use. and consumes less power,
Furthermore, it is possible to provide a highly reliable electric water heater.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of an electric water heater showing an embodiment of the present invention, Figure 2 is a side view showing a part of the electric water heater in cross section, and Figure 3 is an example of a program for the electric water heater. Flowchart showing FIG. 4(a). (b) is a front view and a partially sectional side view of a conventional electric water heater, and FIG. 5 is an electric circuit diagram of the electric water heater. 1... Container, 2... Heating element, 8...
... Microcomputer, 9 ... Pressure detector, 12 ... Relay contact, 14 ... Relay coil, 19 ... Temperature sensor, 21 ...
····Water pipe. Name of agent: Patent attorney Satoshi Nakao and 1 other person/--Isshoki 21--Isshokan Fig. 2/? ? Figure 3

Claims (1)

[Claims] A cylindrical container with a bottom, a heating element that heats water contained in the container, a water pipe connected to the container at the lower part and extending in the vertical direction, and a water pipe provided so as to close the upper end of the water pipe. An electric water heater comprising: a pressure detector that detects the pressure inside the water pipe; and a display means that displays numbers or a level meter according to the output of the pressure detector.