SU984926A1 - First stage pressure reducer for automatic breathing device - Google Patents

Description

(54) FIRST STAGE REDUCER FOR A RESPIRATORY AUTOMATIC

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The 1: 1 invention relates to a diving technique, namely, first stage gearboxes for a breathing machine.

A first stage reducer for a respiratory automaton is known, comprising a housing c. an o-ring which communicates with a safety valve equipped with a coupling for connecting a hose of an automatic machine connected to the upper part of the housing in which a piston with a valve cushion is installed, the latter being made with a shock absorber located between the stop nut and the piston and a seat placed on the nut to connect the gearbox with a compressed air cylinder 1.

Disadvantage of this. the device is that the intra-geared pressure is regulated by a compressed spring and a special adjustment device, which leads to an increase in size. The spring is strongly compressed which prevents the pressure reducer from being adjusted. Due to the significant volume of the cavity of the reducer, which is connected with the surrounding medium, ice plugs are formed in it when operating in a supercooled medium, which leads to its release.

The purpose of the invention is to reduce the weight and dimensions and increase the reliability of the gearbox.

The goal is achieved by the fact that in the gearbox of the first stage for a respiratory automatic machine, the damper of the valve of the reducer is made in the form of an elastic sleeve, for example, a rubber one, the body cavity in the area of this sleeve is communicated with the surrounding

10 by the medium, and the gear housing is adapted to move along the axis of the gear valve relative to the nut for connecting the latter with a compressed air balloon.

The drawing shows a first stage reducer for a respiratory automaton, a common

15 view.

The device includes a housing 1, in which a piston 2 with by-pass channels 3 is installed, a pillow, 4 th valves, an opening 5 for replacing the valve cushion 4, and a fixture 20, an abutting nut 6, connected to the housing by means of a threaded connection. Between the piston 2 and the thrust nut 6, a shock absorber 7 is installed, made in the form of an elastic sleeve, for example rubber, located in the cavity 8 communicated with the environment through the apertures 9. The valve is made with the seat 10 placed on the nut 11, which serves connecting the reducer to a cylinder of compressed gas (not shown) with a strainer 12 through the channel 13, high pressure and connected to the housing 1 by means of a threaded connection, which is locked against the nut 11 by the lock nut 14.

A fitting 15 for connecting the hose of the pulmonary automatic machine with the safety valve 16 is connected to the upper part of the housing 1 and connected to the intra-reducer cavity 17, while being held onto the housing 1 by the restriction screw 18.

The gearbox is equipped with rubber sealing rings 19, which serve for sealing.

The device works as follows.

When the reducer is connected to the high pressure source through the nut 11 through the duct 13 through the saddle 10, the gas enters the valve cushion 4 and through eight ducts 3 fills the cavity 17 of the reducer. When the pressure in cavity 17 rises, piston 2 begins to move, squeezing shock absorber 7, abutting against stop nut 6, until valve cushion 4 blocks access of high-pressure gas through seat 10. When pressure decreases in cavity 1.7, shock absorber 7 abutting the stop nut 6, depresses the piston 2 with the valve cushion 4 from the seat 10. The gas again begins to flow into the cavity of the reducer 17 through the channels 3 and the cycle repeats.

When moving, for example, using a threaded connection of the housing 1 with respect to the nut 11, the piston 2 with the valve cushion 4, the shock absorber 7 and the stop nut 6 move the same distance relative to 10. With an increase in the distance between the valve 2 with the valve cushion 4 and the seat 10 the intra-reducer pressure is increased, since it will take more force to compress the shock absorber 7 that abuts against the stop nut 6. With

decreasing the distance between piston 2 and. by saddle 10, a reduction in intra-reductive pressure occurs. Achieve the required set pressure in the gearbox (5-7 kgf / cm), the housing is fixed with the help of a lock nut 14.

The technical and economic effect is that the proposed design of the gearbox allows adjustment under pressure, which simplifies the design. The implementation of the shock absorber in the form of an elastic sleeve resulted in a reduction in the dimensions of the reducer, and the small volume of the cavity connecting to the environment ensures stable operation in supercooled water, since it does not have time to freeze.

5 due to the reciprocating movement of the piston, which increases the reliability of the reducer.

Claims (1)

Invention Formula A first stage gearbox for a breathing machine, comprising a housing with o-rings, which communicates with a fitting provided with a safety valve for connecting a hose of a pulmonary automatic device connected to the upper part of the housing, in which a piston with a valve spout is installed, the latter with a shock absorber located between the stop nut and a piston and a seat placed on the nut for connecting the reducer with a compressed air balloon, characterized in that, in order to reduce the weight and size parameters it and increase the reliability of the gearbox, the damper of the valve of the gearbox is made in the form of an elastic sleeve, for example, a rubber, the body cavity in the area of this sleeve is in communication with the environment, and the gearbox body is movable along the valve axis of the gearbox relative to the nut to connect the latter to the cylinder compressed air. 0Sources of information taken into account during the examination 1. Nekhoroshev A. S. With an aqualung on the depth M., ed. DOSAAF USSR, 1977, p. 55-58 (prototype). Iff /