CN2144746Y - Automatic alarm cut-off device for gas leakage - Google Patents

Abstract

The utility model relates to an automatic alarm cut-off device automatically detecting the leakage of the carbon monoxide and cutting off the gas source, comprising a carbon monoxide transducer, an integrated circuit chip, a transistor, a capacitance, a resistor, an attracting wire coil, an energy storage spring and an anomalous sealing rubber ring. The automatic alarm cut-off device has the advantages of high sensitivity, strong anti-interference ability, explosion protection, good tightness, gas pressure decrease, stable operation and low cost.

Description

Automatic alarm cut-off device for gas leakage

The utility model relates generally to automatic detection, the warning of piped gas leakage and cuts off the device of source of the gas automatically, and the particularly automatic detection of home pipeline gas leakage, warning reach the device that cuts off source of the gas automatically.

The use of urban duct coal gas has brought very big convenience to people, but owing to the also more and more of gas poisoning death by accident are taken place in improper use.Because the combination force of carbon monoxide and blood is strong especially, as long as human body will be gone into a coma in the environment of the carbon monoxide of 800ppm concentration in 2 hours, in the carbon monoxide environment of 1600ppm concentration 2 hours will be dead, but, as long as control concentration and the time of human body in the carbon monoxide environment, just can prevent the generation of intoxication accident effectively.At present various types of gas leak detectors of producing of this country are all relatively poor to the selectivity of carbon monoxide, or alarm sensitivity is too high and cause false alarm to interference gas; Warning sensitivity is too low and cause that carbon monoxide gas concentration is very high does not also report to the police, thereby the user that the gas leak detector of this type all is not suitable for urban duct coal gas uses.Simultaneously, because the gas leakage alarm signal often do not noted by people or finds that alarm signal poisons and can not walk about and handle accident to leak the coal gas owing to the user, still can not guard against gas poisoning the effectively generation of accident of that general gas alarm.

The purpose of this utility model is the concentration that carbon monoxide in the automatic monitoring of environmental of a kind of energy can be provided, the safety installations that will send tangible acoustooptic alarm signal and the automatic cut-out of time-delay source of the gas when its concentration surpasses safety value, the generation of prevention gas poisoning.

Gas leakage autoalarm described in the utility model is made of following part: gas sensing member; Timer; Transmission mechanism; The working state display device; Voltage comparator; The intermittant voltage generator; Power output stage; Cutter; The periodic voltage generator; Buzzer; Electroluminescence display; Power circuit is formed.

The characteristics of automatic alarm breaking unit for coal gas leaked described in the utility model are to be provided with timer, synchronously control the logical and disconnected of the heater voltage value of gas sensing member and transmission mechanism by timer, thereby improved selectivity and the antijamming capability of this device CO (carbon monoxide converter) gas; Be provided with the intermittant voltage generator, make cutter be operated in no-spark and instantaneous high-power state, thereby make cutter have the firing and explosion prevention function, and cut-out reliable in action, the volume of cutter are dwindled greatly; Adopted bowl ring, made moving of cutter ventilation connecting rod not have relative displacement, thereby improved the seal degree of cutter with seal ring; The high brightness luminescent display device and the high-decibel buzzer that have adopted periodic voltage to drive make the easier user's of causing of alarm attention.

Below in conjunction with accompanying drawing, report to the police the automatically structure of electrotome of gas leakage described in the utility model is elaborated.

Fig. 1 is the block diagram of automatic alarm breaking unit for coal gas leaked described in the utility model;

Fig. 2 is the circuit diagram of automatic alarm breaking unit for coal gas leaked described in the utility model;

Fig. 3 is that automatic alarm breaking unit for coal gas leaked inlet, outlet described in the utility model is the Der Grundsatz der Maschinen schematic representation that is threaded;

Fig. 4 be the suction port of automatic alarm breaking unit for coal gas leaked described in the utility model be threaded, the air outlet is the Der Grundsatz der Maschinen schematic representation that sebific duct connects;

Fig. 5 is that automatic alarm breaking unit for coal gas leaked air inlet/outlet described in the utility model is the Der Grundsatz der Maschinen schematic representation that sebific duct connects.

Referring to Fig. 1, Fig. 1 is the block diagram of automatic alarm breaking unit for coal gas leaked described in the utility model.The control signal of being sent by timer makes gas sensing member be operated in the cleaning state at the start initial stage, makes sensor be in closed condition simultaneously; In the later half cycle, the control signal that timer sends makes gas sensing member be operated in holding state, makes sensor be in opening state simultaneously.After receiving the CO (carbon monoxide converter) gas signal, gas sensing member will export a voltage signal, this voltage signal just can be sent to voltage comparator and compare when transmission mechanism is in opening state, intermittant voltage generator and periodic voltage generator are worked simultaneously, and the intermittant voltage generator directly promotes power output stage work and delays time to make cutter work cut off passage between gas source and the gas appliance in 15 seconds; The periodic voltage generator is driven for emitting lights display device and buzzer work simultaneously then, sends tangible acoustooptic alarm signal, and civil power is supplied with the required voltage of this device each several part circuit working after power transformer step-down and rectification.

Referring to Fig. 2, Fig. 2 is the circuit diagram of automatic alarm breaking unit for coal gas leaked described in the utility model.The dutycycle of being made up of Ic2a, BG1, R1, R2, R3, R4, R5, C1 is 50%, the cycle is that 2 minutes square wave timer is at the energising initial stage, because the voltage on the C1 is 0v, the A point voltage also is 0v, the B point voltage is obtained by R2, R1, R4, dividing potential drop and is higher than the A point voltage, then C points out high level, the BG1 saturation conduction, the D point is low resistive state over the ground; After 1 minute, because the high level that C is ordered makes the A point voltage be higher than the B point voltage by R3 to the charging of C1, then the C point goes out low level immediately, and BG1 ends, and the D point is high-impedance state over the ground; Thereby make at D o'clock every two minutes and low-resistance and high-impedance state over the ground occur once in turn.The output signal of timer has directly been controlled the heater voltage of gas sensing member M1, and when timer was in low resistive state, then M1 was in the cleaning state; When timer was in high-impedance state, then M1 was in holding state.The output signal of timer has also been controlled the transmission mechanism of being made up of D3, R9, and when timer was in low resistive state, the negative terminal of D3 was about 0.1v, and then the F point is clamped on 0.8v, and the signal voltage that transmits out from the E point all consumes on R9; When timer was in high-impedance state, the D point voltage was higher than the F point voltage all the time, and then the D3 reverse bias is equivalent to open circuit, and the signal voltage that E is ordered can successfully be sent on the F point.The output signal of timer has also been controlled the working state display device of being made up of D1, D2, R6, when timer was in low resistive state, the D point was 0.1v, D1, D2, not luminous, illustrate that this device is in the cleaning state, when timer is in high low resistive state, the D point voltage is 3.5v, D1, D2 are lighted by the R6 current limliting, illustrate that this device is in holding state, can receive the carbon monoxide signal.The voltage comparator of being made up of Ic2b, R10, R11 will receive the voltage signal of being sent here by transmission mechanism, and when the F point voltage was higher than the G point voltage, voltage comparator was just exported high level, otherwise with regard to output low level.When voltage comparator output high level, just work by the intermittant voltage generator that Ic2c, D4, C2, R12, R13, R14, R15, R16 form, the power output stage that the output intermittant voltage is formed by BG2, J1, C3, D5, J1-K1 makes the cutter adhesive cut-out gas source of being made up of L3 and 1～No. 20 parts, because intermittant voltage work original state is a low level, the high level of short time for the first time after 15 seconds, just occurs, therefore just can make cutter work after 15 seconds from voltage comparator output high level.Also driven the periodic voltage generator of forming by Ic2d, C6, R18, R19, R20, R21 from the high level of voltage comparator output, this voltage device promotes buzzer M2 again and by the electroluminescence display that BG4, J2, J2-K1, D6, C7, R22, L3 form, sends tangible acoustooptic alarm signal.

220v voltage supplies this device each several part circuit working after T1 step-down, D11～D14 rectification, C5 filtering.The voltage stabilizer of being made up of Ic1, C4 offers M1 and voltage comparator with stable voltage, makes this device can proper functioning.

Referring to Fig. 3, Fig. 3 is that automatic alarm breaking unit for coal gas leaked inlet, outlet described in the utility model is the Der Grundsatz der Maschinen schematic representation that is threaded.Illustrating No. 1 parts is guide lines; No. 2 parts are guide rods; No. 3 parts are retaining springs; No. 4 parts are to inhale iron; No. 5 parts are pull-in windings; No. 6 parts are ventilation buttons; No. 7 parts are upper enclosers; No. 8 are produced part is restoring link; No. 9 parts are ventilation connecting rods; No. 10 parts are reset button; No. 11 parts are supports; No. 12 parts are suction ports; No. 13 parts are air-inlet cavitys; No. 14 parts are outlet chambers; No. 15 parts are air outlets; No. 16 parts are bowl-type sealing rubber rings; No. 17 parts are " L " type sealing rubber rings; No. 18 parts are lower enciosers; No. 19 parts are the energy storage springs that reset; No. 20 parts are abnormity envelope gas rubber rings.The user must be serially connected with any position in the gas pipe line with screw thread with cutter, makes source of the gas feed No. 12 parts, and No. 15 parts are connected with gas appliance.Press the about 4mm of parts No. 6, No. 9, No. 20 parts move down 4mm thereupon, and No. 19 parts are compressed energy storage.No. 4 parts level under the effect of No. 3, No. 2 parts is pinned parts to the right No. 9, and gas source just flows into parts No. 14, No. 15 continuously from No. 12, No. 13 parts.Because No. 12, No. 13, No. 14, No. 15 parts all adopt the heavy caliber design,, can satisfy the industry requirement of piped gas apparatus fully so the air pressure of opening of cutter falls minimumly.Work as S1, when S2 receives intermittently signal voltage, No. 5 parts (L3 among Fig. 2) get electric generation magnetic field, inhale moving No. 4 parts to left movement, because the magnetic field of No. 5 parts generations is very strong, be enough to overcome the reaction force of No. 3 parts, as long as No. 4 parts are moved to the left 1mm, under the effect of No. 19 parts, No. 9 parts drive No. 20 parts immediately and move upward, seal No. 13 parts path to No. 14 parts, because the pressure of suction port is to act on No. 20 parts simultaneously,, thereby make cutter work more reliable along with the also corresponding increase of sealing force of No. 20 parts of increase of gas source pressure to No. 14 parts.No. 2 parts guarantee that No. 4 parts can only move horizontally; No. 9 parts of No. 11, No. 7 parts assurances are done vertical motion; No. 16, No. 17, No. 18 parts have guaranteed the tightness of whole cutter.No. 10 parts, No. 8 parts can make user's manual-lock source of the gas.

Referring to Fig. 4, Fig. 4 be coal gas leakage alarming cutter suction port described in the utility model be threaded, the air outlet is the Der Grundsatz der Maschinen schematic representation that sebific duct connects, shown by reference numeral and working principle illustrate described with Fig. 3.

Referring to Fig. 5, Fig. 5 is that coal gas leakage alarming cutter described in the utility model, suction port, air outlet are the Der Grundsatz der Maschinen schematic representation that sebific duct connects, and shown by reference numeral and working principle illustrate described with Fig. 3.

The main body of cutter of the present utility model constitutes with aluminium diecasting, and wherein 20 parts all are fixed on the main body of aluminium diecasting.The ventilation connecting rod is made with copper material, to guarantee its long-term flexibility; Bowl-type sealing rubber ring and abnormity envelope gas rubber ring are made with the special-purpose butyronitrile rubber material of coal gas ageing-resistant, corrosion resistance gas, to guarantee the working life of cutter.

The part of the utility model except that cutter all is placed in the fire-retardant ABS plastic casing, and this plastic shell is at close M ₁Have several sampling vent slots near the gas sensing member, can be diffused into M effectively with the gas that guarantees external environment condition ₁On every side.Being connected between guide line and the cutter of drawing of electrical appliance part adopted double insulated power line, the metal exposed parts of the input end of 220V civil power and this device must can stand the impact of 3750V voltage and can not puncture, and has so just guaranteed that the user's is safe in utilization.

Claims (5)

1, a kind of automatic alarm breaking unit for coal gas leaked, form by gas sensing member, timer, transmission mechanism, voltage comparator, intermittant voltage generator, cutter and power supply, timer control gas sensing member and transmission mechanism, gas sensing member, transmission mechanism, voltage comparator, intermittant voltage generator, cutter are electrically connected successively, power supply is powered to each several part, it is characterized in that gas sensing member and transmission mechanism are connected with timer simultaneously; Insert the intermittant voltage generator between voltage comparator and the cutter; Cutter is made up of bowl-type sealing rubber ring 16, " L " shape sealing rubber ring 17, profiled seal rubber ring 20, the energy storage spring 19 that resets, adhesive circle 5, retaining spring 3, suction iron 4, support 11, guide rod 2, restoring link 8, ventilation connecting rod 9, suction port 12, air outlet 15, and adhesive circle 5 is at S ₁, S ₂There is intermittent type control signal voltage when input to inhale movingly to inhale iron 4, make ventilation connecting rod 9 under the effect of the energy storage spring 19 that resets, reset, drive profiled seal rubber 20 to seal outlet chamber 14.

2, automatic alarm breaking unit for coal gas leaked as claimed in claim 1 is characterized in that cutter cuts off source of the gas and seals gas rubber ring and the energy storage spring that resets by abnormity and seal the cavity of giving vent to anger and realize.

3, automatic alarm breaking unit for coal gas leaked as claimed in claim 1 is characterized in that the heavy caliber pattern is all adopted in suction port, air-inlet cavity, the air outlet of cutter.

4, automatic alarm breaking unit for coal gas leaked as claimed in claim 1, it is characterized in that cutter is provided with reset button and restoring link, by manually pressing reset button, driving restoring link, promoting to inhale iron simultaneously moves together, replaced the electromagnetic force effect of pull-in winding, made manually and also can close source of the gas.

5, automatic alarm breaking unit for coal gas leaked as claimed in claim 1 is characterized in that the outer of cutter can change according to user's difference requirement by size, and it is unaffected that it cuts off function, can adapt to the usage requirement of different user.

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