CN2044841U

CN2044841U - Fireproof alarm device for electrothermal rug

Info

Publication number: CN2044841U
Application number: CN 88215325
Authority: CN
Inventors: 侯春生
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-10-27
Filing date: 1988-10-27
Publication date: 1989-09-27

Abstract

The utility model relates to a domestic warming tool, particularly an electrothermal rug which can alarm and prevent fire. The utility model is characterized in that an electrothermal wire has a center tap. A balance electric bridge is composed of the center tap and two impedance branch circuits. When the circuit of the electrothermal wire is broken or is in short circuit, an electrical spark is generated. When an arc is pulled, the electric bridge does not in balance. When the current passes through a light emitting element and a sound emitting element, the sound and light alarm signals are sent out. The current passes through a relay, and the power supply is automatically cut off. The fire disaster is prevented.

Description

Fireproof alarm device for electrothermal rug

The utility model relates to a kind of domestic heating apparatus, particularly a kind of electric blanket of energy fireproof alarming.

Electric blanket is the household electrical appliance that people like winter, the firebreak device but existing electric blanket is not reported to the police, if inner open circuit, when short circuit generation electric spark, arcing, but fire hazard, the firebreak device of not reporting to the police uses worried.

In order to address this problem, an overcurrent, undercurrent protection relay or electronic-circuit device can be installed, but the required precision height, thereby poor reliability.

The purpose of this utility model provides a kind of simple in structure, low price, the warning fireproof circuit of good reliability.

Invention is achieved in that the heating wire centre cap with electric blanket picks out single line, constitutes balanced bridge with two impedance branch roads.When internal short-circuit or when opening circuit, the electric bridge imbalance has electric current to pass through on the center bridge, and center bridge connects light-emitting component, light crossing-signal; Center bridge sending and receiving sound component, the acoustic alarm device, succeed electrical equipment on the center bridge, can cut off the electricity supply automatically, prevent fire.

The utility model is centre cap on former heating wire only, and other installs several electric elements additional and constitutes balanced bridge, has just increased the warning fire-proof function, and is simple in structure, practical.

Its concrete structure is provided by following embodiment and accompanying drawing thereof:

Fig. 1 is the electrical schematic diagram according to the warning firebreak device that the utility model proposes.

Describe details and working condition in detail below in conjunction with Fig. 1 according to the concrete device that the utility model proposes.

This device comprises that has a centre tapped heating wire R _L, it and two impedance branch road Z ₁, Z ₂Constitute balanced bridge, under the normal condition, electric bridge is in poised state, and no current passes through on the center bridge, when heating wire opens circuit, during short circuit, electric bridge is in non-equilibrium state, has electric current to pass through on the center bridge, electric current passes through Light-Emitting Diode D, promptly luminous warning; Electric current is by piezoelectric speaker L, i.e. sounding alarm; Electric current can be cut off the electricity supply automatically by relay J.Especially, when electric leakage or human electric shock, this device also can give the alarm and cut off the electricity supply automatically.

The utility model can be simplified, and the acoustic alarm device only is installed, and light crossing-signal, or the automatic cut-off power device also can satisfy the average family requirement can be in parallel between them, series connection or series-parallel connection.

The utility model uses electric blanket safely to old, young, sick, residual, deaf person, blind person, mute especially, prevents that national people's property from suffering a loss, and is of great importance.

Claims

1, electric blanket warning firebreak device is the attachment device of electric blanket, it is characterized in that:

(1) heating wire has a centre cap;

The impedance of (2) two series connection and centre tapped Dian Re Si And connection constitute four arms of balanced bridge;

(3) between heating wire centre cap and two impedance points of contact, be connected to a light-emitting component;

(4) with the Fa Guang Yuan spare And connection or the sounding component of connecting;

(5) with light-emitting component, send out sound component And connection or connect or series-parallel connection one relay, constitute by the impedances of two series connection and the bridge of the balanced bridge of forming by centre tapped heating wire.