SU1245811A1 - Ventilation device of cabinet used for storing and operating cylinders containing toxic and aggressive gases - Google Patents

Description

The invention relates to ventilation and can be used in factories in manufacturing workshops and in research laboratories, for example, in the storage and operation of cylinders with poisonous gases that are ignited when in contact with air.

The purpose of the invention is to increase the safety of operation of cylinders with gases that self-ignite upon contact with air.

FIG. 1 shows a cabinet for storing and operating cylinders; in fig. 2 - the same, vertical section; in fig. 3 - ventilation slots with rotary lobes; in fig. 4 - fire barrier valve.

A ventilation device for the storage and operation of cylinders 1 includes a housing 2 with a door 3 having a fixing mechanism 4, air vents 5 and a viewing window 6, a fan (not shown) connected to an air duct 7 for removing gases and installed In case 2, sensors 8 register gas, and the fan drive is interlocked with the mechanism 4 for fixing the door and sensors 8 for registering gases, and the latter are connected to mechanism 4 for fixing the door.

The device also contains temperature-sensitive elements 9 installed in the housing 2 and a pipeline 10 with an inert gas source connected to it (without showing) and a fire barrier valve 11 with an actuator 12 and an overpressure relief valve 13 placed in the duct, and ventilation gaps 5 are provided with petals 14 pivoting inside the housing 2, the temperature-sensitive elements 9 are interlocked with the mechanism 4 for fixing the door 3 and the source of inert gas, and the fan drive is connected to the actuating mechanism SCM 12 ognepregraditelnoy flap 11. The housing 2 also comprises a fire resistant enclosure gloves 15 attached to the opening 16 and the duct 7, a filter 17.

The ventilation device operates as follows.

In normal mode, during storage and operation of cylinders with poisonous gases, self-igniting when in contact with air m, the ventilation is turned off, the ventilation slots 5 are closed by rotary lobes 14, the fire damper 11 blocks the duct 7, i.e. a sealed volume is created.

In the case of depressurization of cylinders with a gas of ignition, ignited by contact with air, gas is ignited. The temperature-sensitive elements 9 are heated and include a source of inert gas, such as nitrogen, in the housing 2 and the locking mechanism 4 of the door 3. The door 3 does not open in this case.

Nitrogen is supplied through the perforated pipe 10, fills the volume of the housing 2, and the air is forced out through the valve 13 of the overpressure relief. Upon reaching a phlegmatous concentration of nitrogen,

gas ignition ceases. The temperature-sensitive elements 9 cool down and turn off the source of nitrogen. The emergency is eliminated using gas-tight, flame-resistant gloves 15 for the operator and a viewing window 6.

After the emergency situation has been eliminated, manual ventilation is activated to remove the combustion products. In this case, the fan actuates the actuator 12 of the arrester damper 11. The latter opens the duct 7. The rotary lobes 14 under the influence of ventilation forces deviate from the initial position and open the ventilation slots 5, the air flow from the room goes through the ventilation slots 5 of the housing 2,

passes through the entire volume of the housing 2 and is removed through the filter 17 and the duct 7 into the atmosphere.

Since the ignition of some poisonous gases may be unstable (depending on the presence of impurities in the gas, ambient temperature, operating conditions, etc.), it is necessary to protect workers in the event of depressurization of the cylinder 1 with the output of poisoned gas in an amount exceeding the maximum permissible concentration. In this case, the gas detection sensors 8 give a signal to turn on the fan and lock the mechanism 4 for fixing the door 3. Door 3 does not open. The air flow from the room enters through the ventilation

slit 5 and is removed through duct 7 to the atmosphere. In the normal mode (in the absence of gas leakage), the fan is turned on only when the door 3 of the housing 2 is opened.

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Claims (1)

CABINET VENTILATION DEVICE FOR STORING AND OPERATING CYLINDERS WITH POISONAL AND AGGRESSIVE GASES, comprising a housing with a door having a locking mechanism, ventilation slots and an inspection window, a fan with a drive connected to the duct for removing gases, and gas detection sensors installed in the housing, the fan is interlocked with a door locking mechanism and gas detection sensors, and the latter are connected to a door locking mechanism, characterized in that, in order to increase the safety of operation of the ba bosoms with self-igniting gases in contact with air, it contains thermosensitive elements installed in the housing and a pipeline with an inert gas source connected to it and a fire damper located in the duct with an actuator and an overpressure relief valve, and the ventilation slots are equipped with petals rotatable inside the housing, moreover, the heat-sensitive elements are interlocked with the door fixing mechanism and an inert gas source, and the fan drive is connected to tionary mechanism ognepregraditelnoy flap. SU „„ 1245811 Figure 1