CN2443385Y

CN2443385Y - Fireproof alarm

Info

Publication number: CN2443385Y
Application number: CN 00251533
Authority: CN
Inventors: 傅汉水
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-05
Filing date: 2000-09-05
Publication date: 2001-08-15
Anticipated expiration: 2010-09-05

Abstract

The utility model relates to a fireproof alarm, comprising a casing, a transformer, a leakage current mutual inductor, an overload mutual inductor, a control circuit board, and an alternating current contactor, wherein, the casing is provided with a sound and light alarm indicating device and a binding post; the transformer, the leakage current mutual inductor, the overload mutual inductor, the control circuit board, the alternating current contactor are arranged in the casing. Line failure causes the leakage current mutual inductor and the overload mutual inductor to generate induction signal, after processed by a circuit of the control circuit board, the induction signal causes the sound and light alarm indicating device to alarm, power supply is cut off by the alternating current contactor, and the utility model plays the action of fire hazard prevention. The utility model has the advantages of high sensitivity, reasonable circuit structure, and stable operation.

Description

Fire alarm

The utility model relates to a kind of fire alarm.

Fire owing to reasons such as electrical equipment and line short, overload, electric leakage and thunderbolt cause suffers heavy losses user's property and life security.At present, for taking precautions against the generation of electrical fire, generally be that fuse or air switch etc. are set on the line, but these devices need manual operations, and sensitivity is not high, function singleness, is difficult to thoroughly eliminate disaster hidden-trouble.

The purpose of this utility model is a kind of working stability of design, highly sensitive fire alarm, and this device can send alerting signal when the generation electric fault, cut off the electricity supply simultaneously, reaches the effect of thorough elimination disaster hidden-trouble.

For this purpose, the utility model adopts following technical scheme: fire alarm, comprise the casing that is provided with sound and light alarm indicating device and binding post, and be located at transformer, leakage current transformer, overload mutual inductor, control circuit board and A.C. contactor in the casing.Control circuit board is provided with power circuit, signal processing circuit, microcontroller circuit and executive circuit.Fire alarm is connected in the supply line by binding post, line fault makes leakage current transformer, overload mutual inductor produce induced signal, induced signal is sent into microcontroller circuit after signal processing circuit, the signal of output is reported to the police the sound and light alarm indicating device, drive the executive circuit action simultaneously, cut off power supply by A.C. contactor.

This fire alarm adopts leakage current transformer, overload mutual inductor, detection highly sensitive.When breaking down in supply line or the electrical appliance, microcontroller circuit can not only produce multiple alerting signal, and can cut off supply line simultaneously, plays the effect of preventing the fire risk.Circuit structure is reasonable, working stability.

Below in conjunction with drawings and Examples the utility model is described in further detail.

Fig. 1, be the structural front view of the utility model fire alarm.

Fig. 2, be the upward view of Fig. 1.

Fig. 3, be that the A-A of Fig. 2 is to cut-open view (illustrating the inner structure of this machine).

Fig. 4, be the circuit theory diagrams of this fire alarm.

Fig. 5, be the circuit connection diagram of control circuit board in this fire alarm.

Fig. 6, be the user mode figure of this fire alarm.

As shown in Figure 1 and Figure 2, the casing 2 of fire alarm 1 is provided with binding post 3, loudspeaker 4, leakage-current alarm pilot lamp 5, overload-alarm pilot lamp 6, load pilot lamp 7 and control knob 8.As Fig. 6, this fire alarm 1 is connected to in the electric line by binding post 3, and W is an electrical appliance.

Fig. 3 illustrates the inner structure of this fire alarm, be provided with transformer 9, leakage current transformer 10, overload mutual inductor 11, control circuit board 12 and A.C. contactor 13 in the casing 2, the elementary winding of transformer 9 is connected with external power, secondary winding is divided into two tunnel Access Control circuit boards 12, and leakage current transformer 10, overload mutual inductor 11 also are connected with control circuit board 12 with A.C. contactor 13.The principle of work of fire alarm as shown in Figure 4, work as circuit, during the electrical appliance electric leakage, there is electric current to pass through in the coil of leakage current transformer 10, thereby its annular core produces magnetic flux and produces induced voltage, and when circuit overload, be located at A, B, three overload mutual inductors 11 on the C three-phase can produce induced voltage equally, induced voltage is via signal amplification circuit 14, testing circuit 15, after the signal processing circuit that comparator circuit 16 and sweep circuit 17 are formed is handled, send into microcontroller circuit 18, the signal of output is by warning circuit 20, make loudspeaker 4 and pilot lamp 5,6 send sound, visual alarm, make executive circuit 19 actions simultaneously, drive A.C. contactor 13 and cut off external power, the power circuit 21 among the figure provides power supply for entire circuit.

The physical circuit of control circuit board 12 connects as shown in Figure 5, and the induced voltage that leakage current transformer 10 produces is through resistor R ₁, R ₂, capacitor C ₄, diode D ₂, D ₃Conversion is by integrated circuit LM358 and resistor R ₁₃, R ₆₂, R ₄₄, capacitor C ₁₀After the signal amplification circuit of forming amplifies, be divided into two the tunnel by integrated analog switch circuit 4066 and isolate output, one tunnel direct input microprocessor AT2051, another route integrated circuit 4099 carries out circuit scanning, input microprocessor AT2051 behind integrated voltage comparator circuit 4024 again, microprocessor AT2051 carries out data processing, and one group of the alerting signal of output is through triode P ₃Make leakage-current alarm pilot lamp 5 bright, another is organized through capacitor C ₁Be added to integrated circuit LM386, produce drive signal promotion loudspeaker and send alarm sound.The control signal of microprocessor AT2051 output triggers integrated electro coupled circuit TIL117 conducting, makes triode P ₄End, thereby relay J DX is discharged, A.C. contactor 13 also discharges and cuts off external power.

Overload-alarm is finished by following circuit, and: A transships the induced voltage of mutual inductor mutually, through resistor R ₄, R ₅, capacitor C ₆, C ₁, diode D2 ₄, enter by resistor R ₁₃, R ₆, capacitor C ₁₁, C ₁₈The integrating circuit of forming, be divided into two the tunnel by integrated analog switch circuit 4066 and isolate output, one tunnel direct input microprocessor AT2051, another route integrated circuit 4099 carries out circuit scanning, input microprocessor AT2051 behind integrated voltage comparator circuit 4024 again, microprocessor AT2051 carries out data processing, and one group of the alerting signal of output is through triode P ₃Make overload-alarm pilot lamp 6 bright, through triode P2 load pilot lamp group 7 orders are lighted simultaneously, to show the size of load.Another group is through capacitor C ₁Be added to integrated circuit LM386, produce drive signal promotion loudspeaker and send alarm sound.The control signal of microprocessor AT2051 output triggers integrated electro coupled circuit TIL117 conducting, makes triode P ₄End, thereby relay J DX is discharged, A.C. contactor 13 also discharges and cuts off external power.The voltage overload of B, C phase is reported to the police and the same mutually principle of A, is not repeated.

The secondary winding of transformer 9 is divided into two tunnel Access Control circuit boards 12, respectively through diode bridge rectifier circuit Z ₁, Z ₂, filter capacitor C ₂₁And C ₈, be added to integrated regulator 7805 and 7812, produce the DC voltage of 5V and 12V, for entire circuit provides power supply.

Integrated circuit 2402 is a storer, is used to store the required program of microprocessor AT2051 work and the data of setting.

Claims

Fire alarm, comprise the casing that is provided with warning indicating device and binding post, it is characterized in that: be provided with transformer in the casing, leakage current transformer, the overload mutual inductor, control circuit board and A.C. contactor, control circuit board is provided with power circuit, signal processing circuit, microcontroller circuit and executive circuit, fire alarm is connected in the supply line by binding post, line fault makes leakage current transformer, the overload mutual inductor produces induced signal, induced signal is sent into microcontroller circuit after signal processing circuit, the signal of output is reported to the police the warning indicating device, drives the executive circuit action simultaneously, cuts off power supply by A.C. contactor.