CN2349416Y

CN2349416Y - Combustive gas alarm safety valve

Info

Publication number: CN2349416Y
Application number: CN 98221539
Authority: CN
Inventors: 房林
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-06-17
Filing date: 1998-06-17
Publication date: 1999-11-17
Anticipated expiration: 2008-06-17

Abstract

The utility model relates to a combustive gas alarm safety valve, which is composed of an electromagnetic valve and a control circuit, wherein the control circuit is composed of a power supply with a high-frequency switch, a gas sensitive sensor head, an initial delay circuit, a trigger switch circuit and sound and light alarm circuits. The output end of IC2 in the alarm circuit is connected with a coil F of the electromagnetic valve through a triode T and a one-way thyristor SCR; components of the control circuit which are installed and welded on the circuit board and installed in the casing of the control circuit are fixed on the valve seat to make the control circuit and the electromagnetic valve organically combined into one body. The utility model has the advantages of compact volume and high performance.

Description

A kind of combustible gas warning safety valve

The utility model relates to the combustible gas alarm safety device, particularly a kind of combustible gas warning safety valve.

In the prior art, combustible gas warning safety device is a lot, the patent No. that the most common and effect has Patent Office of the People's Republic of China to announce preferably is that 91231634.9 name is called the utility model patent of " self-locking coal gas, liquid gas safety valve ", and the patent No. is 92219455.6, name is called the utility model patent of " inflammable gas safety valve " and application number that Patent Office of the People's Republic of China accepts is 97244861.6, and name is called the utility application of " the pipeline combustible gas leaks safety valve ".These technology can both be sent sound, light warning when combustible gas takes place to leak, export electrical signal simultaneously, drive solenoid valve, block source of the gas, play security personnel's effect.But, because the power transformer volume of power frequency 50HZ is bigger in its control circuit, the volume of The whole control circuit can't be dwindled, solenoid valve partly separates with control circuit, connect by long electric wire therebetween, give and use and installation is made troubles, because the control circuit part hangs separately, also may cause the control error because hanging position is improper.

The purpose of this utility model is a kind of new control circuit that is used for combustible gas warning safety valve of invention, adopt high frequency switch power, the power transformer of cancellation 50HZ, thereby dwindle the volume of control circuit part, effectively control circuit part and solenoid valve partly are installed as one, improved the reliability of complete machine, a kind of compact structure, combustible gas warning safety valve easy to install are provided.

Accompanying drawing 1 is a structural representation of the present utility model;

Accompanying drawing 2 is a control circuit schematic diagram of the present utility model.

The utility model is made up of magnetic valve and control circuit. Its control circuit is by the HF switch electricity Source, gas sensing head, initial time delay circuit, trigger switch circuit harmony, optical alarm circuit Form. The output of IC2 integrated circuit is by triode T and unidirectional controllable silicon S CR and electricity The coil F of magnet valve connects, and printed substrate is installed, is welded on to the components and parts in the control circuit Go up and be contained in the control circuit shell (1), be fixed on the valve seat (14), high frequency is opened Close power supply by current rectifying and wave filtering circuit, type voltage regulation switch power controller spare IC1, inverse peak voltage pincers Position circuit and high frequency switch transformer B form, and the annexation between each components and parts is as follows: The input termination AC power of the current rectifying and wave filtering circuit that is made up of D1-D4 and C1 is at C1 Two ends obtain DC voltage, the positive pole of C1 is connected with an end of the L1 winding of B, at L1 The inverse peak voltage clamp circuit that is formed by R1, C3, D5 in parallel on the winding, R1, C3 parallel connection After, the positive pole of a termination C1, the negative pole of another termination D5, the positive pole of D5 and L1 in addition The D of one end and IC1 end connects, C2 in parallel between the C end of IC1 and the S end, and B's is anti-Also be connected in parallel on behind feedback winding L 3 series connection R2, the D6 between the C end and S end of IC1, B's is inferior The output of level winding L 2 connects the current rectifying and wave filtering circuit that is made up of D7, C4, C5, L0, The end series diode D7 of L2, C4 is connected in parallel between D7 negative pole and the L2, and C4 is just The negative pole of the utmost point and D7 links to each other with the contact of L0, and the positive pole of C5 is connected with the other end of L0, Negative pole is connected with the other end of L2. IC1 is type voltage regulation switch power controller spare, and model is TOP201YA1, this is a kind of control circuit and power switch pipe to be integrated on the same chip Three terminal device, inner by signal oscillating source, PWM comparator, error amplifier, control Circuit a reference source and various kinds of protective circuit form, and its internal oscillator frequency is 100KHZ, makes It is very small that the volume of high frequency switch transformer B can be done. Hold control circuit and device The available engineering plastics of control circuit shell (1) or aluminium, iron are made.

The utility model compact structure, overall volume reduce, realized that solenoid valve and control circuit are integrated, installation, easy to use, except the advantage that possesses existing combustible gas warning safety device, its warning, protection function are more reliable, have enlarged application area, are not only applicable to pipeline combustible gas system, also be applicable to the user of petroleum oil liquid gas storage tank, easy to utilize.

Reference numeral: (1) control circuit shell, (2) air admission hole, (3) air inlet tube connector, (4) upper valve body, (5) iron core, (6) armature, (7) locking nut, (8) connecting rod, (9) Loam cake, (9-1) coil lead hole, (10) core flange, (11) iron core magnetic conduction trim ring, (12) valve plug caulking gum spare, (13) gas outlet tube connector, (14) valve seat. F, coil, Y, alarming horn, VD1, red luminotron, VD2, color-changing light-emitting pipe, QM, air-sensitive Sensing head, AN, release-push.

In conjunction with the accompanying drawings 1,2 pairs of the utility model implementation processes of accompanying drawing further specify.

Connect the 220V power supply, after the D1-D4 rectification, obtain the VDC of about 300V at the C1 two ends, the D that is added in IC1 through the L1 of high frequency transformer B winding holds, and makes internal bias get electric startup work.R1, C3 and D5 form the inverse peak voltage clamp circuit, the square-wave voltage of L2 winding output is through D7, C4, C5, L0 rectifying and wave-filtering, and output dc voltage uses for late-class circuit, and L3 is the feedback winding, the voltage of output is behind D6, R2, C2 rectifying and wave-filtering, and the control end C end that adds IC1 is as sampled voltage.When input voltage descends or load when increasing the weight of to cause that output voltage descends, the L3 feedback voltage also descends, the sample rate current that then injects control end C end reduces, by the inner PWM comparison process of IC1, make linear increase of dutycycle of internal power switching tube, thereby keep the output terminal VDC constant relatively, play pressure stabilization function.Circuit such as this stable DC voltage supply air-sensitive sensing head QM and the trigger switch circuit of forming by IC2 intergrated circuit (ambipolar dual time-base ic piece, its model are NE556), initial time delay circuit, acoustooptic alarm.At the initial stage of connecting power supply, owing to there is the delay circuit of being made up of R4, C6 and IC2, then delay time t=1.1R4C6 second, the delay time of this circuit design can be 100 seconds-300 seconds.After time-delay, the trigger switch circuit just enters working state, to eliminate the initial false alarm characteristic of air-sensitive sensing head, prevents to connect power supply initial stage false alarm, misses and block the generation of source of the gas phenomenon.

When combustible gas leaks, when reaching prescribed response concentration, the electrical signal of air-sensitive sensing head QM output makes the trigger switch circuit turn-on among the IC2, triode T conducting, IC3 alarm song intergrated circuit (model is KD9561) obtains operating voltage, and Y sounds the alarm by alarming horn; Simultaneously, unidirectional controllable silicon S CR conducting, making among the coil F has electric current to flow through, and produces magnetic force, iron core (5) is attracted each other with armature (6), inhales moving armature (6) and moves downward drivening rod (8), make valve plug caulking gum spare (12) close inlet hole (2), block source of the gas, play security personnel's effect.At this moment, red luminotron VD1 also lights, and the indication source of the gas is blocked.After getting rid of leakage failure, need only press the release-push AN on the control circuit shell (1), make coil F outage, SCR loses and keeps voltage cut-off, and magnetic force disappears, and armature (6) is under the elastic-restoring force effect of valve plug caulking gum spare (12), move upward, open inlet hole (2), make the combustible gas pipeline recover ventilation, control circuit reenters on the alert.

When the combustible gas density of monitoring during less than the averag density of air, as rock gas, city coal gas etc., should install at house lead in standpipe and service pipe infall, because of this is located apart from ground greater than 2 meters, nearer from ceiling; When the density of combustible gas during greater than the averag density of air, as liquefied petroleum gas etc., should install end at service pipe, nearer because of this place apart from ground, after leaking, more easily assembles combustible gas.

Claims

1, a kind of combustible gas warning safety valve, form by solenoid valve and control circuit, it is characterized by control circuit is made up of high frequency switch power, air-sensitive sensing head QM, initial time delay circuit, trigger switch circuit and sound light alarming circuit, the output terminal of IC2 is connected with the coil F of solenoid valve with unidirectional controllable silicon S CR by triode T in its warning circuit, the components and parts of control circuit are installed, are welded on the printed wiring board, and be contained in the control circuit shell (1), be fixed on the valve seat (14).

2, a kind of combustible gas warning safety valve according to claim 1, it is characterized by said high frequency switch power by current rectifying and wave filtering circuit, constant-voltage type switch power controller spare IC1, inverse peak voltage clamp circuit and high frequency switch transformer B form, annexation between each components and parts is as follows: the input termination ac power supply of the current rectifying and wave filtering circuit of being made up of D1-D4 and C1, two ends at C1 obtain VDC, the positive pole of C1 is connected with an end of the L1 winding of B, in parallel by R1 on the L1 winding, C3, the inverse peak voltage clamp circuit that D5 forms, R1, after the C3 parallel connection, the positive pole of one termination C1, the negative pole of another termination D5, the positive pole of D5 is connected with the D end of the other end of L1 and IC1, C2 in parallel between the C of IC1 end and the S end, the feedback winding L 3 series connection R2 of B, also be connected in parallel on behind the D6 between the C end and S end of IC1, the output terminal of the secondary windings L2 of B connects by D7, C4, C5, the current rectifying and wave filtering circuit that L0 forms, the end series diode D7 of L2, C4 is connected in parallel between D7 negative pole and the L2, the positive pole of C4 and the negative pole of D7, link to each other with the contact of L0, the positive pole of C5 is connected with the other end of L0, and negative pole is connected with the other end of L2.

3, a kind of combustible gas warning safety valve according to claim 1, the material that it is characterized by the control circuit shell (1) of installation and control circuit is made with engineering plastics or aluminium, iron.