JPS6345808B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a water heater having functions such as boil detection.

Conventional configuration and its problems Traditionally, water heaters with functions such as boiling detection, etc.
It was constructed as shown in Figure 1. 1 is a commercial frequency AC power supply, 2 is a thermostat for keeping warm that opens and closes by sensing the water temperature, 3 is a heater, and 4 is a manual boiling detection device that is attached to the bottom of the water container or the part where steam passes. The reset thermostat 5 and 6 are neon lamps for display.
The heater 3 is connected to an AC power source 1 through a thermostat 2, and a neon lamp 5 and a neon lamp 6 are connected in parallel with the thermostat 2 and the heater 3, respectively.
The manual reset type thermostat 4 is connected in parallel with the thermostat 2. In this way, when the thermostat 2 is on, the neon lamp 6 is lit to indicate the water boiling state, and when the thermostat 2 is off, the neon lamp 5 is lit to indicate the heat retention state. Furthermore, when the manual return type thermostat 4 was turned on, the neon lamp 6 was lit to indicate the water boiling state.

However, in such a conventional configuration, it is not possible to display whether or not the manual return type thermostat 4 is turned on and boil state detection is set, reducing the value of the boil detection type water heater by half.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a water heater that is inexpensive and easy to use, and can display that a manual reset thermostat for boiling detection has been set. .

Structure of the Invention In order to achieve the above object, the water heater of the present invention includes a first thermostat having three terminals common to normally open and normally closed; a heater connected to an AC power source via a normally closed terminal of the first thermostat; a second thermostat connected between the normally closed terminal and the normally open terminal of the first thermostat; a first display device connected in parallel to the heater via a normally open terminal of the first thermostat; a second display device connected in parallel to the heater; and a normally open terminal of the first thermostat. This configuration includes a third display device connected between the closed terminal and the common terminal.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a circuit diagram of a water heater according to an embodiment of the present invention, in which 11 is a commercial frequency AC power supply, 12 is a first thermostat for keeping warm that has three terminals, normally open, normally closed, and common. A heater 13 serving as heating means is connected to a common terminal of the first thermostat 12, and is connected to the AC power source 11 via a normally closed terminal of the first thermostat 12. A second thermostat 14 of a manual return type for boiling detection, which is attached to the bottom of a container containing water or a steam passage part, is connected between the normally open terminal and the normally closed terminal of the first thermostat 12. A first display device 15 consisting of a neon lamp is connected in parallel with the heater 13 via a normally open terminal of the first thermostat 12 . There is also a second lamp made of neon lamps.
The display device 16 is connected in parallel with the heater 13,
A third display device 17 consisting of a neon lamp is connected to the first display device 17.
The thermostat 12 is connected between the normally closed terminal and the common terminal.

Next, the operation will be explained. First, when the second thermostat 14 is off, the first thermostat 1
If the normally closed terminal of the thermostat 2 and the common terminal are short-circuited, the heater 13 is energized, only the second display device 16 lights up, indicating the water boiling state, and the normally open terminal of the first thermostat 12 and the common terminal are connected. If the common terminal is short-circuited, the heater 13 is not energized and the third display device 17 lights up to display the heat retention state.

Next, when the second thermostat 14 is turned on, the first display device lights up to indicate that the boiling state has been detected. When the first thermostat 12 becomes high temperature and the common terminal and the normally open terminal are short-circuited, the heater 13
4 is also connected to the AC power supply. and the second
When the thermostat 14 detects that the water in the container is boiling and turns off, the first
The second display devices 15 and 16 then turn off to indicate that boiling has been reached.

Note that in the above embodiment, the display devices 15 to 1
Although a neon lamp was used as the lamp 7, it goes without saying that the present invention is not limited to this.

Effects of the Invention As explained above, according to the present invention, the setting and completion of boiling state detection of the second thermostat, which detects the boiling state of water in the container, is controlled by the first thermostat.
Since the information is displayed by turning on and off the display device, it is possible to provide a water heater that is easy for the user to operate and is inexpensive.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional water heater, and FIG. 2 is a circuit diagram of a water heater according to an embodiment of the present invention. 12...First thermostat, 13...Heater, 14...Second thermostat, 15...First display device, 16...Second display device, 17...
...Third display device.

Claims (1)

[Claims] 1 A first thermostat having three terminals common to normally open and normally closed; connected to the common terminal of this first thermostat and connected to an AC power source via the normally closed terminal of this first thermostat; a second thermostat connected between the normally closed terminal and the normally open terminal of the first thermostat, and a second thermostat connected in parallel to the heater via the normally open terminal of the first thermostat. a first display device connected to the heater, a second display device connected in parallel to the heater, and a third display device connected between the normally closed terminal and the common terminal of the first thermostat. Water heater with equipment.