RU2681869C2 - Gas flow rate controller - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to pipeline valves, configured to regulate a gas medium flow. For example, a submarine compartment, a resurfacing rescue chamber of an emergency submarine, and the like, where pressure should be reduced to prevent decompression sickness of personnel according to decompression tables, and it should not be arbitrary, but stepped and with speed specified in the tables. For this, the gas flow regulator comprises a housing, inside of which there is a fixed and rotary diaphragm with openings. Pressure gauge, the scale of which is also the scale of the gas flow regulator, is installed coaxially with the diaphragms. To install the required regulator open flow area, a handle position indicator is combined with the gauge arrow, indicating the pressure in the chamber.

EFFECT: invention can be used in controlled pressure reduction (decompression) systems in tanks in which there are people under excessive pressure.

1 cl, 2 dwg

Description

The invention relates to pipe fittings designed to control the flow of a gas medium and can be used to create a gas flow controller (throttle) in systems for controlled pressure reduction (decompression) in tanks in which people are under overpressure. For example, a submarine compartment, a rescue pop-up camera from an emergency submarine, and the like.

Pressure reduction to prevent decompression sickness of personnel should be carried out according to decompression tables, therefore it should not be arbitrary, but in steps and at a speed specified in the tables.

The mass gas flow through the regulator is proportional to the flow area of the throttle and the thermodynamic parameters of the gas at the inlet of the regulator. The greater the area, pressure and density of the gas in front of the throttle, the greater the gas flow. During decompression, the pressure and density of the gas in the tank decrease, and in order to maintain a given rate of pressure reduction (mass flow), the area of the cross-section of the throttle should accordingly increase.

The model of using the system of controlled pressure reduction is such that only personnel in the tank can manage the decompression process, who are there, for example, after an accident, possibly in a physically and morally depressed state.

These circumstances impose increased requirements on the regulator for the convenience of its maintenance and visual representation of its use in conditions of decreasing pressure in the tank.

At this time, the design of the gas flow regulator is not known, which fully ensures the operation of the controlled pressure reduction system.

A known flow controller (copyright certificate for the invention No. 829901, published in Bulletin No. 18 dated 05/15/81) contains a housing with a throttle, which consists of two washers with holes, one of which is fixed in the housing, the other is mounted on a rod with a handle, located outside the housing, and the regulator is equipped with a scale.

But the design of this regulator does not allow you to adjust it to the flow rate corresponding to the current pressure in the chamber.

The aim of the invention is to redesign the gas flow regulator for use in a controlled pressure reduction system. This is achieved by integrating into the regulator coaxially with the diaphragms a pressure gauge measuring the pressure in the chamber, the scale of which is also the scale of the gas flow regulator. To set the required flow area of the regulator, the handle position indicator is combined with the arrow of the pressure gauge showing the pressure in the chamber.

In FIG. 1 shows a General view of the flow controller, which includes:

- housing 1 with openings 7 for gas inlet;

- a fixed diaphragm 5, rigidly fixed in the housing 1 (the diaphragm 5 has openings of variable cross section, the shape of which in Fig. 1 is shown by a dashed line);

- rotary diaphragm 6 with holes in the shape of a circle;

- handle 2;

- position indicator 3;

- pressure gauge for measuring pressure in the chamber 4.

The rotary diaphragm 6, the handle 2 and the position indicator 3 are rigidly interconnected and can rotate around axis 8 from the extreme left to the far right position of the handle.

Each position of the handle 2 corresponds to its own cross-sectional area of the regulator, formed by overlaying holes in the diaphragms 5 and 6 (shown in Fig. 1 by double shading), and the position of the pointer 3 on the pressure gauge scale corresponds to the pressure in the chamber at which the mass flow rate is ensured, providing the required speed pressure reduction.

When designing the regulator, the dimensions of the holes in the diaphragms are calculated according to the known formulas of thermodynamics of gas outflow through the holes. The variable cross-sectional area in the fixed diaphragm 6 provides smooth adjustment.

In FIG. 2 shows a diagram of the installation of a gas flow controller in a rescue pop-up camera.

The gas flow regulator 9 is installed at the inlet of the pressure relief pipeline with shut-off valves 10 from the rescue pop-up chamber 11 into the atmosphere.

In these conditions, the following scenario for using the regulator is implemented.

When the rescue chamber ascends to the surface, the manometer 4 shows the value of the overpressure in it.

The operator rotates the diaphragm 6 with the handle 2 until the pointer 3 is aligned with the current position of the arrow on the pressure gauge scale, and such a passage area is formed that provides the required mass flow rate.

After opening the corresponding shut-off valves through the holes 7, the regulator's bore and the pipeline 10, the gas leaves the chamber into the atmosphere with a mass flow rate, which ensures a safe pressure reduction rate. After reducing the pressure to the next decompression step, the operator closes the shutoff valves on the pipeline 10.

At the end of exposure at the decompression stage, the operator repeats the pressure reduction procedure.

Claims (1)

A gas flow regulator comprising a housing inside which there is a fixed and rotatable diaphragm with holes, characterized in that a pressure gauge is installed coaxially with the diaphragms, the scale of which is also the scale of the gas flow regulator, while the position indicator of the handle is aligned with the arrow to set the required flow area of the regulator pressure gauge showing the pressure in the chamber.

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