RU186603U1 - VALVE PRESSURE VALVE INSULATING RESPIRATORY APPARATUS - Google Patents

Abstract

The utility model relates to constituent parts of chemically bound oxygen insulating breathing apparatus intended to protect respiratory organs in an emergency, namely to overpressure valves. The overpressure valve comprises a valve body 3 provided with a cover 1 with an opening 2 for gas passage, in the form of a hollow sleeve, in which a rod 5 equipped with a spring 4 is installed, equipped with a valve 6 made of elastic material from the gas outlet side, and the cover side is connected to a flexible connection 7 in the form of a cord. The valve body 3 on the gas outlet side is provided with a flange 8 and radial bosses 9 and a bayonet ring 10 with grooves 11 for passing the bosses 9 and containing contact surfaces 12 adjacent to the grooves 11 interacting with the bosses 9 and located along a helical line is installed on the outer surface of the housing. The contact surfaces 12 are adjacent to the fixation pads 13 in the form of sections parallel to the end of the bayonet ring and provided with radial recesses 14. The utility model allows to reduce the dimensions and simplify the manufacture and assembly of the overpressure valve, thereby improving reliability, and secures the overpressure valve to thin-walled elastic materials. 5 zp f-ly, 10 ill.

Description

The utility model relates to constituent parts of chemically bound oxygen insulating breathing apparatus intended to protect respiratory organs in an emergency, namely to overpressure valves.

Known valve operating overpressure (Patent for utility model No. 98634, IPC N01K 2/12, 20.10.2010) containing a valve body, turning into a fitting with a thread for mounting and a valve cover, which contains a piston consisting of a piston and a working surface where P is located, where P = 1, 2, 3, 4, 5, sealing grooves, a cylindrical spring is placed on the piston rod, M is symmetrically located on the lower base of the valve, where M = 2, 3, 4 ..., bleed holes overpressure, the valve cover has T, where T = 1, 2, 3 ..., drainage holes pst, in the center of the valve cover there is a hole in which the piston rod enters, while the valve cover is fixed to the upper base of the valve body by a bayonet type lock. On the lower base of the valve body are four openings for venting excess pressure, and the valve cover has four drainage holes.

The disadvantages of the known device are as follows: With increasing pressure, the gas presses on the piston, compressing the coil spring, the piston rises, opening the holes located symmetrically on the lower base of the valve body. Gas goes out through the open holes, the gas pressure drops, the piston lowers under the pressure of the coil spring, providing the required gas pressure, closing the holes for bleeding the gas. Thus, the sensitivity of the valve depends on the diameter of the valve and ranges from 0.2 to 1.0 atm, which does not allow the use of valves of this type in insulating breathing apparatus, the working pressure in which is 1-2 orders of magnitude lower and ranges from 35 to 200 mm of water. Art.

These shortcomings are due to structural features of the known technical solutions.

Also known is the exhalation valve assembly for respirators (A.S. No. 2034583, IPC АВВ 9/02, 1995), which relates mainly to personal respiratory protective equipment. The valve assembly comprises a body with an exhalation channel with external threads and a shoulder, a perforated cover, and an exhalation valve petal. The outer end of the body is limited by the saddle of the petal. The channel is made tapering to the outlet with a saddle.

The disadvantage of this valve is the dependence of the valve capacity on the ambient temperature: in the cold, the valve petal can stick in the saddle, as it loses its ductility. At high temperatures, it becomes not tight enough.

These shortcomings are due to structural features of the known technical solutions

Closest to the utility model is an overpressure valve of an insulating breathing apparatus with chemically bound oxygen (RF Patent No. 2335314, IPC АВВ 7/08, 2008), mounted on a breathing bag, containing a valve mounted in a housing with a cap connected to a spring-loaded stem. The stem is equipped with an elastic tip on the side of the inlet in the housing and is connected by a flexible connection to the wall of the breathing bag, and the valve body is hermetically fixed to the opposite wall in the skirt and enclosed in a sleeve made of an elastic material, for example, in the form of a piece of a silicone tube.

This method of attachment is implemented in the manufacture of a breathing bag from an elastic material, for example, from a rubberized fabric, or a 4-MB fluoroplastic film, which can be stretched to form a skirt for installing an overpressure valve. However, for a breathing bag made of a polyimide film, which is produced by watering a polyimide varnish like AD-9103, obtained in a solution of dimethylformamide, the formation of a mounting skirt is impossible due to the low ductility. This makes the known valve unsuitable for installation in insulating breathing apparatus with a respiratory bag made of a polyimide film.

These shortcomings are due to structural features of the known technical solutions.

The proposed utility model is aimed at improving reliability by eliminating the above disadvantages.

Based on the foregoing, it follows that the task to which the development of a utility model is aimed is to eliminate these drawbacks, that is, to ensure that the overpressure valve is fixed on thin-walled films.

The technical result of the utility model is to reduce the size and simplify the manufacture and assembly.

The solution to this problem is achieved by the fact that in the overpressure valve containing a valve body provided with a cover with an opening for gas passage, in the form of a hollow sleeve, in which a spring-loaded stem is installed, equipped with a valve of elastic material on the gas outlet side and a flexible connection on the gas side in the form of a cord, the valve body on the gas outlet side is provided with a flange and radial bosses and a bayonet ring with grooves for passing the bosses and containing contact adjacent to the grooves is installed on the outer surface of the housing surfaces interacting with bosses and located along a helical line.

Fixation pads in the form of sections located parallel to the end of the bayonet ring and provided with radial recesses can adjoin the contact surfaces.

Concentric grooves may be made on the flange, which may include concentric protrusions made on a bayonet ring.

The distance between the contact surface of the flange and the surface of the pins facing it may be equal to the thickness of the bayonet ring in the fixation areas.

On the bayonet ring, pins located parallel to the generatrix of the housing can be made, or instead of the pins, the bayonet ring can be provided with recesses for the tool to rotate the bayonet ring around the axis.

Between the distinguishing features and the achieved technical result, there is the following causal relationship.

Supply of the valve body from the gas outlet side with a flange and radial bosses, installation of a bayonet ring with grooves for passing the bosses and contact surfaces adjacent to the grooves interacting with the bosses and located along a helical line on the outer surface of the valve provides a spatial structure that allows fixing between the body flange and the surface of the bayonet ring a thin-walled (35-50 μm) shell for installing an overpressure valve on it. As shown by experimental verification, this design ensures the tightness of the connection and withstands vibration and transport (shock) tests.

This design allows to reduce the dimensions of the valve, it is simple not only to manufacture, but also convenient when assembling an insulating breathing apparatus.

The implementation of the fixation sites adjacent to the contact surfaces in the form of sections located parallel to the end of the bayonet ring and provided with radial recesses provides angular fixation of the bayonet ring, which increases the reliability of the device.

The implementation of concentric grooves on the flange and concentric protrusions on the bayonet ring provide a more reliable fixation of the valve on the breathing bag, which improves reliability.

The choice of the distance between the contact surface of the flange and the surface of the pins facing it, equal to the thickness of the bayonet ring in the fixation areas, allows to achieve a reduction in size due to the optimization of the thickness of the bayonet ring.

On the bayonet ring, pins located parallel to the generatrix of the housing can be made, or blind holes can be made in place of the pins on the bayonet ring. These features provide rotation of the bayonet ring during assembly.

According to the information available to the applicant, the set of essential features of the claimed utility model is not known from the prior art, which allows us to conclude that the claimed object meets the criterion of "novelty."

The set of essential features characterizing the essence of the utility model can be repeatedly used in the production of various modifications of breathing apparatuses to obtain a technical result, which consists in providing a reduction in size and simplifying the design and manufacturing while improving the reliability of the connection. At the same time, assembly of the product is simplified, which allows us to conclude that the claimed object meets the criterion of "industrial applicability".

The essence of the utility model is illustrated by drawings, where:

in FIG. 1 shows a sectional overpressure valve, general view;

in FIG. 2 - the same as in figure 1, a top view;

in FIG. 3 shows a valve body structure;

in FIG. 4 - the same as in figure 3, but rotated 90 ° with a partial section;

in FIG. 5 shows a bayonet ring, a top view;

in FIG. 6 is the same as in FIG. 5 is a cross-sectional side view;

in FIG. 7 shows a bayonet ring of a valve with blind holes instead of pins, top view;

in FIG. 8 is the same as in FIG. 7 is a side view, cross section;

in FIG. 9 shows a design of contact surfaces of a housing flange and a bayonet ring;

in FIG. 10 shows the design of the working part of an insulating breathing apparatus with an overpressure valve mounted on the breathing bag. The list of items indicated in the drawings:

1. cap;

2. gas vent;

3. housing;

4. spring

5. stock

6. valve;

7. flexible connection (cord);

8. flange;

9. boss;

10. bayonet ring;

11. groove;

12. contact surface;

13. fixation pad;

14. radial recess;

15. concentric groove;

16. the protrusion is concentric;

17. pin;

18. blind hole;

19. a breathing bag;

20. grill.

The overpressure valve comprises a valve body 3 provided with a cover 1 with openings 2 for gas passage, in the form of a hollow sleeve, in which a rod 5 equipped with a spring 4 is installed, equipped with a valve 6 made of elastic material from the gas outlet side, and the cover side is connected to a flexible connection 7 in the form of a cord. The valve body 3 on the gas outlet side is provided with a flange 8 and radial bosses 9 and a bayonet ring 10 with grooves 11 for passing the bosses 9 and containing contact surfaces 12 adjacent to the grooves 11 interacting with the bosses 9 and located along a helical line is installed on the outer surface of the housing. The contact surfaces 12 are adjacent to the fixation pads 13 in the form of sections parallel to the end of the bayonet ring and provided with radial recesses 14.

Concentric grooves 15 are made on the flange 8, which includes concentric protrusions 16 made on the bayonet ring 10. The distance between the contact surface of the flange 8 and the surface of the bosses facing it 9 is equal to the thickness of the bayonet ring 10 in the fixing sections 13.

On the bayonet ring 10, pins 17 are arranged parallel to the generatrix of the housing for its rotation. Instead of pins 17 on the bayonet ring, blind holes 18 can be made for a special tool for turning the bayonet ring 10 when installing the overpressure valve on the breathing bag 19. The bottom of the cover 1 can be made in the form of a grill 20.

For mounting the overpressure valve in the front wall of the breathing bag 19, a hole is made with a diameter equal to the diameter of the housing 3, into which the housing 3 is inserted together with the stem 5, valve 6, cover 1 and flexible connection 7 passed through the central opening of the cover 3 so so that the flange 8 is against the wall. A bayonet ring 10 is mounted on the housing 3 from the inside of the breathing bag 19 so that the bosses 9 pass through the grooves 11. Then the bayonet ring 10 is turned with respect to the housing 3 using pins 17 or with a tool inserted into blind holes 18. When the boss 9 is rotated interact with the contact surfaces 12, moving the bayonet ring 10 to the flange 8, providing a tight connection of the housing 3 with the breathing bag 19. The rotation of the bayonet ring 10 ends with the bosses 9 leading to the radial recess 14 on the area fixation 13. After that, the free end of the flexible connection using known means is fixed on the back wall of the breathing bag 19. Then, the breathing bag 19 is sealed by thermo-compression welding.

The overpressure valve operates as follows.

During the operation of the insulating breathing apparatus, the exhaled gas-air mixture (GVS) is cleaned of carbon dioxide and the volume of oxygen absorbed during breathing is replenished. Since the amount of oxygen released by volume exceeds the amount of absorbed carbon dioxide by about 20% (the so-called regeneration coefficient is approximately 1.2). This increases the pressure of the hot water supply in the breathing bag 19, which makes it difficult for the user to breathe. Under the influence of pressure, the shell of the breathing bag 19 inflates, creating a flexible connection (cord) tension, which is transmitted to the stem 5, compressing the spring 4, and moves the valve 6 in the housing 3. This causes the excess hot water to be discharged through the hole 2 in the cover 1 to the atmosphere. After reducing the pressure in the breathing bag 19, the valve 6 under the action of the spring 4 again closes the hole 2 to reset the hot water supply.

The utility model allows to reduce the dimensions and simplify the manufacture and assembly of the overpressure valve, thereby providing increased reliability, and secures the overpressure valve to thin-walled elastic materials.

Claims (6)

1. An overpressure valve comprising a valve body in the form of a hollow sleeve provided with a cap with gas passage openings, in which a spring-loaded stem is installed, equipped with a valve of elastic material on the gas outlet side and a flexible connection in the form of a cord on the cap side, characterized in that the valve body on the gas outlet side is provided with a flange and radial bosses and a bayonet ring with grooves for passing the bosses and containing contact surfaces adjacent to the grooves is installed on the outer surface of the housing, in Interaction of tacker and situated on the helix. 2. The valve according to claim 1, characterized in that the fixation areas are adjacent to the contact surfaces in the form of sections parallel to the end of the bayonet ring and provided with radial recesses. 3. The valve according to claim 1, characterized in that the flange is made of concentric grooves, which include concentric protrusions made on the bayonet ring. 4. The valve according to claim 1, characterized in that the distance between the contact surface of the flange and the surface of the pins facing it is equal to the thickness of the bayonet ring in the fixation areas. 5. The valve according to claim 1, characterized in that the pins are arranged on the bayonet ring parallel to the generatrix of the housing. 6. The valve according to paragraphs. 1 or 5, characterized in that the bayonet ring is provided with blind holes for the tool to rotate the bayonet ring.

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