JPS58102119A - Alarm device for heated bath - Google Patents

Abstract

PURPOSE:To obtain the reporting device without erroneous operations by using a lead switch having an amorphous alloy in a detecting part. CONSTITUTION:The detecting part 2 is connected to a the main body of the reporting device 1. The detecting part 2 is arranged so that it is immersed in the bath tub. The detecting part 2 is constituted by the lead switch 4, a permanent magnet 5, and the amorphous alloy 6 provided between the lead switch and the permanent magnet 5. When the temperature in the bath tub exceeds a Curie point, magnetism in the amorphous alloy 6 is changed and its ferromagnetism is lost. When the temperature in the bath tub is increased and the water grows hot, the magnetic flux of the permanent magnet 5 passes the amorphous alloy 6 whose magnetism is lost. As a result, the lead switch 4 is turned ON, and a buzzer 9 is sounded.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention Minute Hand The present invention relates to a bath-boiling 9 notification for detecting water temperature and notifying the bath-boiling condition.

TECHNICAL BACKGROUND OF THE INVENTION Conventionally, this type of alarm has housed a temperature-sensitive resistance element such as a thermistor or a positor in a detection cylinder, and
It is arranged so as to be submerged in water in a bathtub, and detects a change in resistance of the temperature-sensitive resistance element according to the water temperature in the bathtub to operate a buzzer or the like.

Problems with the Background Art However, with the above configuration, if moisture adheres to the temperature-sensitive resistance element and causes a short circuit between its lead wires, the apparent resistance value of the temperature-sensitive resistance element decreases due to electrical conduction by the water. There are nine problems with malfunctions. However, it is difficult to make the temperature-sensitive resistance element completely moisture-proof because it is placed inside a bathtub, and it is difficult to increase sales. There is a problem in that due to the difference in coefficient of thermal expansion, a gap gradually forms between the plastic and the temperature-sensitive resistance element, allowing water to enter.

Purpose/target of invention The purpose of the present invention is to prevent malfunction even if moisture enters.

SUMMARY OF THE INVENTION The present invention utilizes the temperature-dependent magnetic change characteristics of an amorphous alloy to provide an amorphous alloy so that its temperature changes according to the water temperature in a bathtub, and detects the magnetic change in the amorphous alloy to provide an alarm device. It is characterized by the configuration in which it operates.

Embodiments of the Invention Below, embodiments of the present invention will be described with reference to FIGS. 1 and 2. Reference numeral 1 denotes a main body of the alarm, and 2 a detection tube connected to the main body 1 of the alarm via a lead wire 3. The detection tube 2 is arranged so that its lower part is submerged in water in a bathtub. At the bottom of this detection tube 2, a reed switch 4 and an amorphous alloy 6 placed near the reed switch 4 and placed so as to block the gap between the nine permanent magnets 5, the reed switch 4, and the permanent magnets 50 are made of plastic 2a. The amorphous alloy 6 is buried and stored in such a way that the temperature of the amorphous alloy 6 changes depending on the temperature of the water in the bathtub. By the way, as is well known, an amorphous alloy turns into magnetic ash and loses its ferromagnetism when its temperature exceeds the Curie point.
eQ, 25) As 788ia B14, one cue point is set at approximately 60"C. On the other hand, a power switch 7, a battery 8, and a buzzer 9 corresponding to an alarm device are arranged in the alarm main body 1, and these are detected. Reed switch 4 inside tube 2
They are connected together as shown in FIG. 2 to form a detection circuit 10.

Therefore, this detection circuit 10 causes the buzzer 9 to sound when both the power switch 7 and the reed switch 4 are closed.

Now, in the above configuration, first, the detection tube 2t is arranged so that its tip is submerged in the water of the bathtub, and the power switch 7 of the alarm main body 1 is closed. At this time, if the temperature of the water in the bathtub is still low, and therefore the temperature of the amorphous alloy 6 is below the Curie point, the amorphous alloy 6 acts as a ferromagnetic substance, so the magnetic field from the permanent magnet 5 is applied to the amorphous alloy 6. The reed switch 4 does not reach the reed switch 4 because it is blocked by the reed switch 4, and the reed switch 4 reaches the open state 1. When the temperature of the water in the bathtub gradually rises and the temperature of the amorphous alloy 6 exceeds the Curie point, the amorphous alloy 6 rapidly loses its ferromagnetism due to the magnetic change, and therefore the magnetic field of the permanent magnet 5 reaches the reed switch 4, the reed switch 4 is closed, and the buzzer 9 sounds to notify that the bath has heated up.

According to this embodiment, the buzzer 9 is connected to the reed switch 4.
It is activated only when the switch is closed, and is not activated due to a change in resistance value as in the conventional case, so in the unlikely event that water gets into the detection tube 2 and the 4m lead wire of the reed switch 4,
Even if the resistance value between the lead wires 4m and 4b of the series reed switch 4 changes due to the conduction resistance (in divisor Ω) of water adhering between the leads 4b, there is no possibility that the buzzer 9 will malfunction.

FIG. 3 shows a second embodiment of the present invention, which differs from the first embodiment in that a delay circuit 11 is provided in the detection circuit 10 so that the buzzer 9 sounds after a predetermined time delay after the reed switch 4 is closed. Moreover, the delay time of this delay circuit 11 can be set arbitrarily. With this configuration, even if the amorphous alloy 6 reaches a predetermined temperature determined by its components and the reed switch 4 is closed, the water temperature will further rise until the buzzer 9 actually sounds, so the delay time ' By adjusting the water temperature, the water temperature at which the sipzer 9 sounds can be arbitrarily set.

In each of the above embodiments, the reed switch 4 is used as the detection circuit.
Although the present invention is not limited to this, for example, the presence or absence of a magnetic material may be detected by a change in the inductance of a coil.

Effects of the Invention As described above, the present invention can provide a bath-boiling@detector that can prevent malfunctions due to adhesion of moisture.

[Brief explanation of the drawing]

FIG. 1 is an overall plan view showing the first embodiment of the present invention, and FIG.
The figure is the same wiring diagram, and Figure 3 is a second diagram showing the second embodiment of the present invention.
It is a figure equivalent figure. In the figure, 4 is a reed switch, 6 is an amorphous alloy, and 9 is a reed switch.
L buzzer (notification device), 10 is a detection circuit, and 11 is a delay circuit.

Claims (1)

[Claims] 1. The temperature changes depending on the temperature of the water in the bathtub.51k
A bath-boiling alarm comprising a ff-tomo-fass alloy and a detection circuit that detects a change in magnetism based on a temperature change in the amorphous alloy and operates an alarm device.