CN2378586Y - Magnetic keeping combustable gas safety control valve - Google Patents

Abstract

The utility model relates to a magnetic keeping type safety control valve for combustible gas, which is a leaking safety device of a combustible gas system of a pipeline; the utility model is composed of a control valve and a control circuit, wherein, the control circuit is installed in a casing of the control circuit and is connected with a valve seat of the safety control valve into integration. Normally open state and normally close state can be changed only by the instant input of different electropolar voltage of an electromagnetic coil; when the normally open state and the normally close state are maintained, the electromagnetic coil does not need supplying electricity. The utility model has the characteristics of no temperature rise on the job, energy saving, long service life and high reliability.

Description

Magnetic freeze mode combustible gas security personnel control valve

The utility model relates to pipeline combustible gas alarm safety device, particularly a kind ofly both can keep normally open, can keep the magnetic freeze mode electromechanical integration leakage alarm security personnel control valve of normally off again.

In the prior art, the leakage alarm safety valve that is applied in the pipeline combustible gas system can be divided into two classes: the first kind is to reverse the cock spool or mention valve plug with manpower, simultaneously energy storage spring is elongated or compression, utilize the mechanical caging lock fixed, make security personnel's control valve be in normally open; When combustible gas leaked, control circuit sent acoustooptic alarm, and control relay normally opened contact or the moment conducting of positive temperature coefficient PTC thermistor, the 220V Ac is added to electromagnetic coil, produce electromagnetic force, stop pin is threaded off, under the effect of spring restoring force, close safety valve.The patent No. of announcing as Patent Office of the People's Republic of China is 90211217.1, and name is called " gas leakage warning security personnel reduction valve " and just belongs to this class.Second class is to keep normally open when the electromagnetic coil no electric circuit, and when passing to the 5-60V VDC, electromagnetic coil generation electromagnetic force, suction moving armature, drive valve plug are closed the safety valve inlet hole, and keep closed condition under "on" position.The patent No. of announcing as Patent Office of the People's Republic of China is 89216050.0, and name is called " security personnel's pressure-limit valve " and the patent No. is 97244861.6, and name is called the utility model patent of " the pipeline combustible gas leaks safety valve ".More than the deficiency of two classes be: the first kind is when discharging mechanical stop pin and thread off, and electromagnetic coil moment operating current can reach 5A, has the shortcoming of unsafe factor and poor reliability, thereby is not used widely.Though second class has overcome the shortcoming of the first kind, exist and keep the deficiency that closed condition needs constantly energising to keep.

The purpose of this utility model is a kind of pipeline combustible gas system that is applied to of invention, and the pulsed dc voltage of opposed polarity is powered to electromagnetic coil with moment, after pulsed voltage disappears, still can keep often opening or the magnetic freeze mode combustible gas of the normally off control valve of ensuring public security.

The purpose of this utility model can realize by following measure: it is made up of security personnel's control valve and control circuit.Security personnel's control valve is linked by valve plug Sealing and valve body by valve seat; Valve seat has the air inlet connecting port, give vent to anger connecting port and inlet hole; Coil carrier, electromagnetic coil, location trim ring, magnetic conduction trim ring, magnetic conduction packing ring and annular permanent magnnet are housed in the valve body; Electromagnetic coil is contained in the iron core on coil carrier, and annular permanent magnnet N, S the two poles of the earth should be in the axial direction, and are contained in the middle of magnetic conduction packing ring and the magnetic conduction trim ring, place the lower end of coil carrier.Because when the magnetic induction intensity of annular permanent magnnet was too big, the electromagnetic force that electromagnetic coil produces can not be offset armature and iron core under the spring force effect the suction-combining force discharged, and causes and can not transfer normally closed attitude to by normal ON state; When annular permanent magnnet magnetic induction intensity too hour, the electromagnetic force that electromagnetic coil produces is difficult for overcoming the elastic force of spring, the normally closed attitude when discharging transfers normal ON state to.Therefore, the magnetic induction intensity of annular permanent magnnet should be chosen between 500-1500 Gauss.The armature that can move up and down is housed in the central through bore of coil carrier, in the blind hole of armature center spring is installed, the lower end of armature is connected with the valve plug Sealing, and the valve plug Sealing is pressed between valve body and the valve seat.Loam cake has the coil lead hole, so that and the output terminal of control circuit connection.When combustible gas takes place to leak and reaches prescribed response concentration, the electrical signal of the air-sensitive sensing head QM output in the control circuit makes IC1 intergrated circuit (ambipolar dual time-base ic, model is NE556) in the trigger switch circuit turn-on, the conducting of T1 PNP triode, IC2 alarm song intergrated circuit (model is KD9561) obtains operating voltage, alarming horn Y sounds the alarm, power source voltage Vcc to the C4 momentary charge, makes T2 NPN transistor base obtain positive voltage and conducting by the emitter and collector of T1 simultaneously.Because the normally-closed contact of AN2-1 is connected on the positive source Vcc, the normally-closed contact of AN2-2 is connected on the T2 collector electrode, thereby makes electromagnetic coil F obtain operating voltage, produces electromagnetic force.If repel each other in the magnetic field that produces and the magnetic field of annular permanent magnnet, then armature moves downward under magnetic field repulsive force and spring force effect, drives the valve plug Sealing and closes inlet hole, and keep closed condition under the spring force effect; If inhale mutually with the magnetic field of annular permanent magnnet in the magnetic field that produces, then armature overcomes spring force and moves upward under the effect of magnetic attraction, drives the valve plug Sealing, opens inlet hole and recovers to ventilate.At this moment, even the electromagnetic coil outage, because the existence of annular permanent magnnet, iron core and armature still keep attracting state.Thereby, only need moment to import the operating voltage of electromagnetic coil opposed polarity, just can produce and often open or normally closed two states; When keeping every kind of state, electromagnetic coil is power consumption no longer.Control circuit is installed in the control circuit shell, and with security personnel control valve valve seat join together.

The utility model is often opened or during normally off, only needs the voltage of moment input electromagnetic coil opposed polarity changing; Keep often opening or during normally off, do not need to power to electromagnetic coil.There is not temperature rise during work, not only energy-conservation, and operating life and reliability are improved greatly, easy to utilize.

Structure of the present utility model can be referring to accompanying drawing.

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is the structural representation of iron core and armature.

Fig. 3 is circuit theory diagrams of the present utility model.

As seen from Figure 1, the utility model is made up of security personnel's control valve and control circuit.Control circuit is contained in the control circuit shell (1), joins together by bolt or draw-in groove and valve seat (17).Security personnel's control valve is connected with valve body (15) by valve plug Sealing (4) by valve seat (17), valve plug Sealing (4) is crushed between valve seat (17) and the valve body (15), combustible gas can not entered in the valve body (15), valve seat (17) two ends have air inlet connecting port (3) and the connecting port of giving vent to anger (16) respectively, there is inlet hole (2) at the center, coil carrier (13) is housed in the valve body (15), electromagnetic coil F is on coil carrier (13), be contained in the iron core (14), annular permanent magnnet (6) is contained in the middle of magnetic conduction packing ring (7) and the magnetic conduction trim ring (5), places the lower end of coil carrier (13).N, S the two poles of the earth of annular permanent magnnet (6) should be in the axial direction, and its magnetic induction intensity should be chosen between 500-1500 Gauss.The armature (8) that can move up and down is housed in the central through bore of coil carrier (13), and the lower end of armature (8) is connected with valve plug Sealing (4), and spring (9) is housed in the blind hole at center, and trim ring (12) is located iron core (14).(10) be loam cake, its center has fairlead (11), is convenient to connect with the output terminal of control circuit.

As seen from Figure 2, in order to guarantee the electromagnetic force under the working stroke, increase initial suction, the head of armature (8) can be made the frustum of a cone stepped shaft, make pull characteristics more smooth, the also corresponding concavity of making of the end face of iron core (14) is equivalent to increase face area like this.

As seen from Figure 3, C1 is a filter capacitor, is connected in parallel between power Vcc and the ground wire; R1 is the divider resistance of air-sensitive sensing head QM; Adjustable resistance W is used to regulate the response concentration of inflammable gas.Ambipolar dual time-base ic NE556 forms trigger switch circuit, initial time delay circuit.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 of IC1, then base stage is connected on the positive-negative-positive triode T1 conducting of IC1 output terminal, the IC2 alarm song intergrated circuit KD9561 that is connected on its collector electrode obtains operating voltage, by alarming horn Y sound the alarm, LED1 sends ruddiness.Because the T1 conducting makes the capacitor C 4 that is connected on T1 collector electrode and T2 base stage by momentary charge, impels NPN triode T2 base stage to obtain positive voltage, also moment conducting.Electromagnetic coil F is connected between T2 collector electrode and the power Vcc by normally-closed contact AN2-1, AN2-2, obtain operating voltage, produce the electromagnetic force of repelling each other with annular permanent magnnet (6), armature (8) is under the effect of spring (9) elastic force, move downward, drive valve plug Sealing (4) and close inlet hole (2).After getting rid of leakage failure, only need moment press and often open button AN2 on the control circuit shell (1), the then closed conducting of the normally opened contact of AN2-1, AN2-2, make electromagnetic coil F obtain the moment working inverse voltage, iron core (14) is inhaled mutually with armature (8), spring (9) is compressed, and armature (8) drives valve plug Sealing (4) and moves upward, and opens inlet hole (2).The magnetic field of annular permanent magnnet (6) is passed to iron core (14) by magnetic conduction trim ring (5) and armature (8) is sucked.At this moment, do not have electric current to flow through among the electromagnetic coil F, can keep normally open yet.When pressing AN2, send the green glow indication with the LED2 that is connected in parallel on electromagnetic coil F two ends after R6 connects.

When maintenance combustible gas pipeline, when needing to force to enter normally off, only need moment to press AN1, make the T2 base stage obtain the positive voltage conducting through R5, just can realize normally off.

D1 is connected in parallel between T2 base stage and the emitter, for C4 provides discharge loop; D2 is the protection diode, can select the reference diode of 5-10V for use, and positive pole connects with the collector electrode of T2, and negative pole connects the power Vcc end, to absorb the induced electromotive force that electromagnetic coil F produces.

The utility model not only can be used for the leakage security personnel of pipeline combustible gas system, also can be used for the actuator of other fluid system control open and closes, and can be used as the electric control valve of intellective IC card metering air feed table.

Claims (3)

1, magnetic freeze mode combustible gas security personnel control valve, form by security personnel's control valve and control circuit, control circuit is contained in the control circuit shell (1), security personnel's control valve is connected with valve body (15) by valve plug Sealing (4) by valve seat (17), coil carrier (13) is housed in the valve body (15), electromagnetic coil F, iron core (14), annular permanent magnnet (6), magnetic conduction packing ring (7), magnetic conduction trim ring (5), armature (8), spring (9), trim ring (12), the armature (8) that can move up and down is housed in the central through bore of coil carrier (13), valve plug Sealing (4) is crushed between valve seat (17) and the valve body (15), valve seat (17) two ends have air inlet connecting port (3) and the connecting port of giving vent to anger (16) respectively, there is inlet hole (2) at the center, electromagnetic coil F is on coil carrier (13), be contained in the iron core (14), trim ring (12) is located iron core (14), it is characterized in that the valve seat (17) that the control circuit shell (1) of control circuit and the control valve of ensuring public security are housed joins together, annular permanent magnnet (6) is contained in the middle of magnetic conduction packing ring (7) and the magnetic conduction trim ring (5), place the lower end of coil carrier (13), the lower end of armature (8) is connected with valve plug Sealing (4), and spring (9) is housed in the blind hole at center.

2, according to the described magnetic freeze mode of claim 1 combustible gas security personnel control valve, N, S the two poles of the earth of it is characterized by annular permanent magnnet (6) should be in the axial direction, and its magnetic induction intensity should be chosen between 500-1500 Gauss.

3, according to the described magnetic freeze mode of claim 1 combustible gas security personnel control valve, the head that it is characterized by armature (8) can be made the frustum of a cone stepped shaft, the also corresponding concavity of making of the end face of iron core (14).

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