JPH10257972A - Electric water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric water heater by which the boiling of water can be securely maintained. SOLUTION: An electric water heater is provided with a main heating unit 2 for heating the liquid inside a vessel 1, an automatic temperature regulator 3 for controlling the electrification of the main heating unit 2, an auxiliary heating unit 7 separately provided aside from the main heating unit 2, and a manually reset type temperature switch 8 for detecting the temperature of the auxiliary heating unit 7 and also for controlling the electrification of the auxiliary heating unit 7. Further, the main heating unit 2 and the automatic temperature regulator 3 are wired in series, and also that in which the auxiliary heating unit 7 and the manually reset type temperature switch 8 have been wired in series is wired with the automatic temperature regulator 3 in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device for an electric water heater for heating and boiling a contained liquid.

[0002]

2. Description of the Related Art A conventional heating system for an electric water heater or the like is as shown in FIGS.

[0003] Reference numeral 101 denotes a container for storing a liquid.
In the lower part of 1, a main heating element 102 for heating the liquid and a switchable automatic temperature controller 103 for controlling the main heating element 102.
And a temperature fuse 104.

[0005] Reference numeral 105 denotes a manual reset type temperature switch. A knob 107 for operating the manual reset type temperature switch 105 is provided on a body 106 which is disposed above the full position of the container 101 and covers the outside of the container 101. Provided. 108
Is an over-temperature prevention device provided to prevent an abnormal rise in temperature of the main heating element 102 together with the temperature fuse 104.

Next, an electric circuit will be described with reference to FIG. From one end of the power supply, a circuit in which the temperature fuse 104, the main heating element 102, and the overheat prevention device 108 are connected in series is connected to the terminal of the normally closed circuit of the automatic temperature controller 103, and from the terminal of this normally closed circuit. It is connected to a normally open circuit terminal of the automatic temperature controller 103 via a manual reset type temperature switch 105, and a common terminal of the automatic temperature controller 103 is connected to a power supply.

With the above arrangement, when the water is put into the container 101 and the knob 107 is pushed to close the manual reset type temperature switch 105 and connected to the power source, the main heating element 102 is made up of the temperature fuse 104 and the overheat prevention device. 108, automatic temperature controller 1
03 is supplied with electricity through the container 10 to generate heat.
Heat the water in 1.

When the water is heated to reach the operating temperature of the automatic temperature controller 103, the automatic temperature controller 103 opens the normally closed circuit and closes the normally open circuit. In this state, electricity from the power supply is supplied to the temperature switch 105 of the manual reset type.
Is supplied via the main heating element 102, and the energized state of the main heating element 102 is further continued. When the water in the container 101 boils to generate steam, the temperature of the sensing surface of the manually reset type temperature switch 105 rapidly rises due to the steam, and the manually reset type temperature switch 105 operates to operate the main heating element. The supply of electricity to 102 is stopped and boiling stops.

[0008]

However, in the above-mentioned conventional structure, steam cannot be detected unless the mounting surface of the manual reset type temperature switch 105 is disposed above the full position of the container 101. There is a problem that the height of the container 101 is increased and the cost is increased.

The temperature of the steam is 100 ° C. on a flat ground, and exceeds this temperature.
Since the operating temperature cannot be set, it is usually necessary to set the upper limit to 98 ° C. including the variation in the operating temperature. This means that the boiling time is short even when considering the delay in temperature sensing due to the thermal mass of the sensing portion of the manual reset type temperature switch 105, the hot water cannot be sufficiently boiled, and the manual reset type temperature switch 105 Since the operating temperature is set close to the boiling temperature, there is a problem that a device for preventing an abnormal temperature rise of the temperature fuse 104 and the excessive temperature rise prevention device 108 is required, and the cost is further increased.

[0010]

In order to solve the above-mentioned problems, an electric water heater according to the present invention comprises a container for accommodating a liquid, a main heating element for heating the liquid in the container, and a main heating element. An automatic temperature controller for controlling the energization of the automatic heating device, and a series connection of an auxiliary heating element and a temperature switch connected in parallel to the automatic temperature controller, wherein the temperature switch is energized according to the temperature of the auxiliary heating element. It is a change of state.

[0011]

DETAILED DESCRIPTION OF THE INVENTION The invention according to a first aspect of the present invention is directed to a container for containing a liquid, a main heating element for heating the liquid in the container, and an automatic temperature controller for controlling energization of the main heating element. An auxiliary heating element and a temperature switch connected in series to the automatic temperature controller, wherein the temperature switch changes an energized state according to the temperature of the auxiliary heating element, thereby automatically controlling the temperature. When the temperature controller reaches the set temperature and operates, power supply to the auxiliary heating element is started. When the temperature of the auxiliary heating element reaches the set temperature of the manually reset type temperature switch with the rise in temperature of the auxiliary heating element, the operation is performed, and the power supply to the main heating element and the auxiliary heating element is stopped.

The time from the operation of the automatic temperature controller to the operation of the manual reset type temperature switch can be arbitrarily set since the manual reset type temperature switch senses the temperature of the auxiliary heating element, so that boiling can be ensured. Can be secured.

According to the second aspect of the present invention, the boiling performance can be ensured even if the auxiliary heating element and the manual return type temperature switch are arranged below the side of the container, so that the height of the container can be set low.

According to a third aspect of the present invention, a part of the components of the auxiliary heating element is extended to constitute a sensing surface of a manually reset type temperature switch, and a part of the sensing surface is closely attached to the container. With this configuration, it is possible to reliably follow the temperature rise of the auxiliary heating element and to follow the water temperature in the container, so that the boiling can be surely performed even if the amount of water in the container changes.

[0015]

【Example】

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
This will be described below.

In FIG. 1, reference numeral 1 denotes a substantially cylindrical container for storing a liquid, and a main heating element 2 is attached to a lower end of the container 1. Reference numeral 3 denotes an automatic temperature controller, which controls energization of the main heating element 2. This automatic temperature controller 3 has two circuits, a normally closed circuit and a normally open circuit, and is inverted when the set operating temperature is reached.

Reference numeral 4 denotes a lead-out path, one end of which is disposed below the container 1, the other end of which is disposed in the discharge port 5 outside the body, and an electric pump 6 is provided during the introduction. Reference numeral 7 denotes an auxiliary heating element which is disposed below the side of the container 1 and extends at one end to constitute a sensing surface 9 of a manually reset type temperature switch 8 and a part of the sensing surface 9 is formed by a container. 1 and closely adhered. Reference numeral 10 denotes a knob for manually resetting the temperature switch 8 of a manual reset type, which is slidably attached to a body 11 disposed outside the container 1. Reference numeral 12 denotes a temperature fuse which is attached to the lower part of the container 1.

In the above configuration, a circuit will be described. A circuit in which the main heating element 2 and the automatic temperature controller 3 are arranged in series is connected to a power supply, and a series circuit of an auxiliary heating element 7 and a manual reset type temperature switch 8 is connected in parallel with the automatic temperature controller 3. It is composed.

Next, the operation of this embodiment will be described. When water is poured into the container 1 and the knob 10 is pressed to close the manual return type temperature switch 8 to close the circuit, and then connected to a power source, the main heating element 2 has the automatic temperature controller 3 in a closed state. The body 2 is energized and the water in the container 1 is heated. When the temperature of the mounting surface of the thermostat 3 rises and reaches the set temperature of the thermostat 3, the thermostat 3 operates and the contacts are opened.

In this state, the manual reset type temperature switch 8 is used.
Are closed, the main heating element 2 is further energized via the automatic temperature controller 3 and the auxiliary heating element 7, and the auxiliary heating element 7 is energized. Since the sensing surface 9 of the manual reset type temperature switch 8 is configured by extending a part of the auxiliary heating element 7, the temperature of the sensing surface 9 rises when the auxiliary heating element 7 is energized, and When the operating temperature of the return-type temperature switch 8 is reached, the manual return-type temperature switch 8 is operated, and the power supply to the auxiliary heating element 7 and the main heating element 2 is stopped. When the water channel 7 is closed by sliding the knob 11, the stopper 16 provided on a part of the knob 11 is inserted between the switch 14 and the button 15, and the switch 14 is pressed. Prevent operation.

Although the embodiment of the present invention has been described using an electric pump 5 as a tapping means, the same effect can be obtained by using a manual air pump. There is.

[0022]

As described above, according to the first aspect of the present invention, as a means for detecting boiling, the temperature of the auxiliary heating element which starts energization after water heating is sensed by the manual reset type temperature switch. The operating temperature of the manual reset type temperature switch can be set to an arbitrary temperature up to the saturation temperature by the auxiliary heating element, and the boiling time can be sufficiently ensured.

According to the second aspect of the present invention, since there is no restriction on the height of the container, the height of the container can be reduced and the container can be supplied at low cost.

According to the third aspect of the present invention, since the water temperature in the container is followed, it is possible to cope with a change in the amount of water, and the temperature rise of the auxiliary heating element can be reliably detected. Since the number of prevention devices can be minimized, it can be supplied at low cost.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electric water heater showing one embodiment of the present invention.

FIG. 2 is an electric circuit diagram of the electric water heater.

FIG. 3 is a longitudinal sectional view of a conventional electric water heater.

FIG. 4 is an electric circuit diagram of the electric water heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container 2 Main heating element 3 Automatic temperature controller 7 Auxiliary heating element 8 Manual reset type temperature switch 9 Sensitive surface

Claims (3)

[Claims] 1. A container for accommodating a liquid, a main heating element for heating the liquid in the container, an automatic temperature controller for controlling energization of the main heating element, and connected in parallel to the automatic temperature controller. An electric water heater comprising: a connected auxiliary heating element and a series connection of a temperature switch, wherein the temperature switch changes an energized state according to a temperature of the auxiliary heating element. 2. The electric water heater according to claim 1, wherein the auxiliary heating element and the temperature switch are disposed below a side portion of the container. 3. A part of the auxiliary heating element is used as a sensing surface of a temperature switch and is closely attached to a container.
An electric kettle as described.