SU369274A1 - DEVICE FOR PREVENTION OF METHANE EXPLOSION IN EXPLOSIVE CONCENTRATION - Google Patents

Description

This invention relates to safety equipment and to instruments for monitoring the concentration of gas in methane degassing systems in coal mines. It can be used together with means that prevent the flow of gas explosive concentrations in the degassing system.

The known automatic devices for preventing the entry of methane, operating on the principle of thermal conductivity detection, are not sufficiently reliable, since the emergency shutdown of gas from the consumer occurs as a result of errors and at safe concentrations of methane.

There are no devices operating on the principle of microexplosion} first concentration of methane in the sensor.

The proposed device ensures reliable safety. This is achieved by the fact that the sensor is made in the form of an airtight chamber with an elastic diaphragm, which interacts with it, through contacts with a cut-off ciiCTC.

FIG. 1 is a block diagram of the device; pas figs. 2 - sensor circuit.

A device to prevent methane from entering an explosive concentration consists of a cylinder / with air, a gearbox 2 with a pressure gauge, a valve 5 of fine adjustment

with a pressure gauge, a mixing chamber 4, a water seal 5, and a source 6, initiating, of its torch. The sensor with supply channels is made in the form of an airtight chamber 7 with an elastic diaphragm 8, on which I contacts are located including an emergency automatic circuit.

The device works as follows.

The methane-air mixture after the pumping station is discharged from the main and through the throttle enters the mixing chamber, where methane is diluted with air to increase the explosion hazard of the mixture. Air flow from the cylinder through the gearbox adjust the valve fine adjustment. An explosive mixture from the mixing chamber through a water seal, designed to prevent a reverse explosion of the mixture, enters the microexplosion chamber 7 and ignites with a flare from source 6. At the concentration of methane reaching the hazardous area, an intermittent explosion occurs through the elastic diaphragm on the emergency contacts. automatics.

The working chamber of the sensor communicates with the space formed by the diaphragm in the microexplosion chamber, and the contact group in the event of an explosion and destruction of the diaphragm activates the emergency automation and cuts off the explosive mixture in the main

3

consumer; an emergency release into the atmosphere occurs.

In order to bring stapling to an outgoing position and a reduction in the size of the diaphragm and the charging of the sensor chamber. The contact group is on alert.

Subject invention

Device for preventing methane from entering an explosive concentration at de4

gazazioinoy criCTc ie, including otsschk:, sensor, supply point 11e capa tspi) uyup1n sources of flame, tir.L those who go, with- Target () is1 -.H. with my elastic, interacting through a cut-off system.