SU1179401A1 - Dangerously explosive concentration alarm - Google Patents

Abstract

SIGNALING CONVERSION CONCENTRATIONS containing an explosion chamber with a spark generator and fire arresters placed in it, through which the explosion chamber is connected to the line of the analyzed gas, the explosion indicator, the ejector with a valve and a combustible gas dosing unit containing a pulsing capacity and four valves, a working cavity, and a cavity, a working cavity and a cavity, and a cavity with a valve and a combustible gas dosing unit containing a pulsating capacitance and four valves, a working cavity. respectively, through the first and second valves with the line of combustible gas and through the flame arrester with the explosion chamber, controlling the cavity of the pulsating tank through the third and fourth The valves are connected respectively to the atmosphere and the feed channel, the control chambers of the combustible gas metering valves are connected to one output of the control unit, the second and third outputs of which are connected respectively to the control inputs of the ejector and the spark generator, which is , in order to increase the reliability of the detector, an inertial link, two comparators, -TMN additional valves, pneumatic capacitance, pneumorele, impulse and fault and danger indicators, feed channel are inserted into it On the inlet of the first additional valve, the outlet of which is connected to the inertial link input, the control input of the first additional valve is connected to the first output of the control unit, the output of the inertial link is connected (L to the inputs of both comparators directly, and through the second additional valve to the atmosphere, output the first comparator is connected to the control inputs of the third additional valve and pneumorele, the output of the second comparator is connected to the fault indicator, the input from the pneumorele is connected to the explosion indicator and, Jib pneumatic relay outputs connected to the indium-katorom danger impulsatora and to the input, the output of which is coupled to the control input of the second additional valve and to the input power of the first comparator, and via a third additional pneumosizes stem pan is connected to the pulsating working chamber container.

Description

The invention relates to instrumentation, namely, to alarms of pre-explosive concentrations of combustible gas and vapor, and can be used in emergency protection systems, for example, and signaling in: chemical, oil and other industries. The aim of the invention is to increase the reliability of the alarm of pre-explosive concentrations. FIG. 1 shows the principle on the scheme of the proposed device alarm device; figure 2 - cyclogram of his work. The warning device contains an explosion chamber 1 with an integrated generator of spraying and flame arresters, an explosion indicator, an ejector 3 with a valve, a dispenser 4 of combustible gas based on a pulsed tank 5 with a working 5 c and controlling 5 cavities, an inertial control unit 6 link 7 is based on throttles and capacitors, comparators 8 and 9, additional valves 10-12, pneumatic capacity 13, pneumorele 14, pulsator 15 based on a relay with a throttle and capacity formed by the relay chamber, and 11 fault indicator 16 and danger indicator 17. The big analyzer works on the principle of direct testing of the medium and explosiveness by artificially inting the gas to be analyzed, enriched with a certain amount of combustible gas. The control unit 6 forms, at its three outputs, sequences of non-overlapping pulses P, P. The following processes are carried out alternately in separate elements and nodes of the detector in turn. By sucking the analyzed gas through the explosion chamber (0), the explosion products are removed from the chamber and sampling is constant in magnitude and independent of the ejection level of the ejector sample of the analyzed gas by forming atmospheric pressure in the chamber at the moment of short-term disconnection of the ejector from the supply pressure. the combustible gas lines take the dose (PII 0) and transfer it to chamber 1 (iPti 1). This dose is ensured by means of stabilizing the pressure Pp at the entrance to cavity 5) (and constant volume of the tank 5). using a piezoceramic converter, an electric spark is formed in chamber 1 (Pij 1), as a result of which, depending on the state of gas sample enriched with combustible gas, explosions occur in the chamber or do not occur, fixed by indicator 2. A piezoceramic converter can produce a spark without electric supply. With continuous impulses following short-term connections of the inertial link 7 via the tO valve to the supply pressure line in the link capacitance 7 increases the pressure Pj. When this pressure reaches a value sufficient to trigger the comparator 8, at the output of the last signal 1, which, acting on valve 12 and pneumorel 14, will connect the air capacity. 13 to the cavity 5), and the output P of the indicator 2 to the input of the pulser 15. This will result in. that the dose of combustible gas entering chamber 1 will increase. The volume of the container 13 is chosen so that even in the absence of the analyzed gas of combustible components in the chamber 1 explosions occur. The presence of explosions in the chamber in this case indicates the normal functioning of all nodes and elements of the detector. At the time of the occurrence of the explosion, the signal P .1 will trigger the operation of the pulser 15, i.e. the appearance at its output of a short-term signal Rc O, with which the pressure Rukhiz of the capacitance of the link 7 through the valve 11 is collected. The signal at the output of the PX of the comparator 8 will again become equal to Ru 0. Thus, the capacitance 13 is disconnected from the cavity 5, and the output of the indicator 2 is connected to the input of the indicator 17. In the following, the described processes are repeated in the same order until it crashes. in the operation of any element or node. In this case, an explosion in chamber 1 does not occur, i.e. P0. The pulsator 15 does not work, P continues to increase until the second comparator 9 operates. At this moment, the supply pressure across 311

is given to indicator 16, which signals a fault. If the explosion in chamber 1 occurs with the tank 13 turned off, then the signal P 1 from the indicator 2 through the pneumorele 14 goes to the indicator 17, which signals danger.

In order to increase the reliability of operation of indicators 16 and 17, the same whistle is used, the input of which is connected to the supply pressure line either directly or through a generator of pneumatic pulses (not shown). In this case, the danger signal will be, for example, intermittent, and the signal of injustice is unmistakable or vice versa.

To ensure reliable operation of the comparator 9 after operation14

neither of the comparator 8 with the same full-time setting (equal, for example, to the pressure of 0.6-0.7 kgf / cm), they are made on the basis of 2- and 3-membrane elements like PZK.1 and P1P.1.

The intermittent communication of the throttles of the link 7 with the supply pressure line allows monitoring of the working capacity after 80-100 or more alarms, which also contributes to reliability, since with more frequent monitoring due to explosions

excessive heating of the chamber shell, the release of large quantities of explosion products, etc. undesirable. events.

(rig .;

P

Pti

P Pt2

(Reg. 2

Claims (1)

EXPLOSION CONCENTRATION SIGNALIZER containing an explosion chamber with sparks and fire arresters placed in it, through which the explosion chamber is connected to the analyzed gas line, an explosion indicator, an ejector with a valve and a combustible gas dispenser containing a pulsating tank and four valves, the working cavity of the pulsating tank respectively, through the first and second valves with a line of combustible gas and through a flame arrester with an explosion chamber, the control cavity of the pulsating tank through the third and fourth valves They are connected, respectively, with the atmosphere and the supply channel, the control chambers of the valves of the gas metering unit are connected to one output of the control unit, the second and third outputs of which are connected respectively to the control inputs of the valve of the ejector and the spark generator, which differs in that, in order to increase reliability of the signal of theizer, an inertial link, two comparators, three additional valves, pneumatic tanks, pneumatic relays, a pulse generator and indicators of malfunction and danger are introduced into it, the power channel is connected to the input of the first of the additional valve, the output of which is connected to the input of the inertial link, the control input of the first additional valve is connected to the first output of the control unit, the output of the inertial link is connected to the inputs of both comparators, and through the second additional valve to the atmosphere, the output of the first comparator is connected to the control inputs the third additional valve and pneumatic relay, the output of the second comparator - with a fault indicator, the pneumatic relay input - with an explosion indicator, the pneumatic relay outputs are connected s with indie. hazard hazard and with the input of the pulsator, the output of which is connected to the control input of the second additional valve and to the power input of the first comparator, and the pneumatic capacity through the third additional valve is connected to the working cavity of the pulsating tank.