Passive audible and visual alarm temperature indicating device
A sound and light alarm and temperature display technology, which is applied in the direction of measuring devices, electrical devices, thermometers, etc., can solve the problems of affecting the normal operation of electrical equipment, not being able to detect equipment heating in time, and the temperature display sheet falling off, etc., to achieve low power consumption and long life. , good safety effect
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Embodiment 1
[0025] Such as figure 1 A schematic circuit diagram of the temperature display device of the present invention is shown.
[0026] The power supply of the present invention is composed of a current transformer TA, and its power supply side is the transmission line on one side of the electrical connection point between the power supply equipment components of the power system. When a current flows through the transmission line, the secondary side of the TA generates an induced current. The induced current passes through the full-wave rectification circuit composed of diodes V1, V2, V3 and V4, and the output is pulsating direct current, then flows through the series circuit composed of V5, V6, V7 and V8 to stabilize the voltage, and then is filtered by the C1 capacitor to obtain about 3V around DC voltage. This voltage provides power for the temperature detection part, the sound alarm system and the luminous display part.
[0027] The detection part is composed of thermistor R...
Embodiment 2
[0034] Such as figure 2 Shown is a schematic diagram of the installation and wiring of the temperature display device of the present invention in the power system.
[0035] The TA iron core of the current transformer adopts an elliptical iron core (an annular iron core of other shapes can also be used), the primary side passes through the iron core, and the secondary side coil is wound on the iron core (refer to the detailed structure image 3 ).
[0036] The temperature-measuring resistor R2 is pasted to the connection point to be detected, and R2 is required to have good electrical insulation and sealing with the outside world and a good thermal path with the contact surface of the connection point. R2 is connected with the points M and N of the circuit by connecting wires. The iron core of the current transformer TA and the connection wires between R2 and the M and N points of the circuit should be fixed on the transmission line at last to prevent the connection wire fro...
Embodiment 3
[0038] Such as image 3 A schematic structural diagram of the temperature display device of the present invention is shown.
[0039] In the figure, 1 is the iron core of the current transformer TA, 2 is the fastening bolt, 3 is the sealed outer casing, 4 is the secondary side winding wound on the iron core of the current transformer TA, and 5 is figure 1 M, N contact terminals in the circuit, 6 is figure 1 The circuit board of the circuit, 7 is the alarm indicator diode, 8 is the alarm piezoelectric ceramic buzzer, 9 is the transmission line on one side of the electrical connection point between the power supply equipment components of the power system, that is, the primary side of the current transformer TA winding.
[0040] The iron cores 1 of the two semicircular current transformers TA are fixedly connected by fastening bolts 2; the center of the iron core 1 of the current transformer TA passes through the power line 9; the sealed outer shell 4 is connected to the iron c...
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