JPH0431443Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cooking stove equipped with a function to detect just before boiling when overheating the contents of a pot or kettle.

Traditionally, some kettles have a whistle to let you know when the water is boiling, but this is a unique feature of this kettle that is different from other regular kettles.

There are also gas stoves that come with a temperature control function, but the mechanism is complicated and cheaper stoves do not have this feature.

The purpose of this invention is to use a simple mechanism to sense the slight vibrations of a kettle, pot, etc. just before it boils, detect this electrical signal, and notify you of the boiling of water or boiling over of cooked food, and control the heat source. It is something to do.

To explain this with a drawing, it is constructed such that the lower end of the top plate 7 rests on the upper part of the top plate 11, and has a convex vibration transmitting part 3 on the back surface near the bottom where the lower end comes into contact with the top plate. The semiconductor pressure sensor 1 is installed at the tip of the convex vibration transmitting part 3 using the adjusting screw 2.
contact.

The fixing part 4 is firmly installed on the frame of the gas stove, etc., so that the vibration of the top plate 11 is reliably transmitted as pressure to the semiconductor pressure sensor, and in order to prevent structural resonance. This is for fine adjustment to lightly contact the plate 11.

Now, when the contents of a kettle, pot, etc. are overheated, the vibrations caused by bubbles generated just before boiling are transmitted to the top plate and applied as pressure to the semiconductor pressure sensor on the back, which turns into a pulsed electrical signal and detects it. to obtain input to the electronic control circuit. The vibrations of kettles, pots, etc. just before boiling last for several tens of seconds, and other short-term, sporadic noise vibrations can be identified using electronic circuits.

An example of an electronic circuit is shown in the block diagram of FIG.

When the pulses corresponding to the frequency from the semiconductor pressure sensor 12 reach the preset number of pulses in the memory circuit 17 within a preset time in the one-shot circuit 15, a signal is sent and a solenoid valve is actuated to change the heat source from high to low. Switch to

As described above, the present invention uses a sensor on the back side of the top plate to detect vibrations caused by the generation of bubbles in the liquid content of a kettle or pot just before boiling, and obtains input to an electronic control circuit using a simple mechanism. It can be used regardless of the shape or type of cooking container and prevents boiling over.

Moreover, the mechanism of this invention can also be applied to an electromagnetic cooker.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the present invention. Figure 2 shows the electronic circuit configuration according to the block diagram of the present invention. 1 is a semiconductor pressure sensor, 2 is an adjustment screw, 3 is a convex vibration transmitting part, 4 is a concave fixing part, 5 is an electronic device main body, 6 is a fixing allowance, 7 is like, 8 is a saucer, 9
is a burner, 10 is a kettle, 11 is a top plate, 12 is a sensor, 13 is an amplifier circuit, 14 is a waveform shaping circuit, 15 is a one-shot circuit, 16 is a gate circuit, 17 is a memory circuit, 18 is an oscillation circuit, 1
9 is an output circuit, 20 is a speaker, 21 is a switching valve, 22 is a power supply, and 23 is a gas tank.

Claims (1)

[Scope of utility model registration request] A vibration sensing mechanism that incorporates a semiconductor pressure sensor between a convex part on the back surface near the bottom of the top plate that comes into contact with it and a fixed part that receives vibrations, detects the vibrations of the top plate, and converts them into electrical signals; A cooking stove equipped with a control circuit that detects the signal from a semiconductor pressure sensor with a detection section consisting of a one-shot circuit, a memory circuit, etc., notifies you when the boil is about to boil, and controls the heat source from strong to weak.