RU2845067C1 - Adapter for connecting the internal threaded attachment of the front part of the filtering personal respiratory protection device and a filter having an outer diameter of 82.5 mm - Google Patents

Abstract

FIELD: breathing masks or helmets.

SUBSTANCE: invention relates to gas mask equipment, to parts of gas masks. Adapter for connection of the internal threaded attachment of the front part of the filtering means for individual protection of respiratory organs and a filter having an outer diameter of 82.5 mm, contains an adapter housing with an external diameter of 81 mm, consisting of a board with height of 9 mm and thickness of 2 mm, two stops made in the form of semi-ovals with thickness of 3 mm, external threaded fastener with a nominal thread diameter of 40 mm, a thread pitch of 4 mm and a radius of curvature of 1.25 mm, gasket having an annular solid shape, in the vertical section – a rectangle, with inner diameter of 71 mm, outer diameter of 77 mm, thickness of 1.5 mm and installed on the pad for gasket made on the inner side of the adapter housing.

EFFECT: provision of safe and tight connection between the internal threaded fastening of the face part of the filtering personal respiratory protection device, which corresponds to the requirements of GOST 8762-75, and the filter having external diameter of 82.5 mm.

1 cl, 9 dwg

Description

1. Field of technology to which the invention relates

The present invention relates to gas mask technology and to gas mask parts.

2. State of the art

The Sundstrom SR 280-3 Filter adapter [https://srsafety.com/product/sr-280-3-filter-adapter (Accessed: 11.02.2025)] is known from the prior art, which is the closest analogue (prototype) of the claimed invention.

The adapter includes an external threaded connection with thread parameters that comply with the requirements of EN 148-1:1999 [EN 148-1:1999 Respiratory protective devices - Threads for facepieces - Part 1: Standard thread connection].

The Sundstrom SR 280-3 Filter adapter has a plastic external threaded mount and a rubber base.

The disadvantages of this technical solution include the fact that this adapter (Sundstrom SR 280-3 Filter adapter) can only be used for Sundstrom branded filters and only for masks (gas masks) that have an internal threaded mount that meets the requirements of the EN 148-1:1999 standard.

3. Disclosure of the essence of the invention

Technical problem solved by creating an invention- develop an adapter that allows provide the possibility of safe use of filters with an external diameter of 82.5 mm with an internal threaded fastening of the face part of the filtering personal respiratory protective equipment (PPE) that meets the requirements of GOST 8762-75 [GOST 8762-75. Interstate standard. Round thread with a diameter of 40 mm for gas masks and calibers for it. Main dimensions].

Filters with an external diameter of 82.5 mm include filters known from the state of the art from Briz-Kama LLC, for example:

replaceable gas mask filters for the respirator "BRIZ-2201 (RPG)" of the A1, K1, A1B1E1, A1B1E1K1 brands, which are designed to protect human respiratory organs from vapors and gases of harmful substances present in the air of the working area of industrial premises [https://brizcentr.ru/product/filtr_briz-2201_rpg.html (Accessed: 11.02.2025)];

replaceable filters for the respirator "BRIZ-3201(RU)" of the brands A1P1 R D, K1P1RD, A1B1E1P1RD, A1B1E1K1P1RD, which are designed to protect human respiratory organs from vapors and gases of harmful substances and aerosols (dust, smoke, fog) present in the air of the working area of industrial premises [https://brizcentr.ru/product/briz-3201_ru-60m.html (Accessed: 11.02.2025)].

These filters comply with the requirements of GOST 12.4.235-2012, TR CU 019/2011, TU 2568-005-54598330-2006.

A distinctive feature of these filters is that the housings of these filters have an external diameter of 82.5 mm (D ₁ ), as well as a special fastening system, which is a groove 3 mm high, the external diameter D ₂ of the filter housing in the groove area is 76 mm, the external diameter D ₃ of the filter housing in the rim area is 78 mm, the height of the rim (1) is 2 mm (Fig. 1).

As face parts of filtering RPE that meet the requirements of GOST 8762-75, it is possible to use face parts of gas masks known from the prior art, for example: PMK-S, PMK-4, GP-21, PMG-2, GP-5; full-face masks, for example: MAG, MAG-3L, MAG-4, MPG-IZOD, etc. [https://protivogaz.ru/catalog/litsevye-chasti/panoramnye-maski/(Accessed: 12.02.2025)].

The technical result is to ensure a safe and hermetic connection between the internal threaded fastening of the face part of the filtering RPE, which meets the requirements of GOST 8762-75, and a filter having an external diameter of 82.5 mm.

The developed adapter, connecting the internal threaded fastening of the face part of the filtering RPE, corresponding to the requirements of GOST 8762-75 and the filter, having an external diameter of 82.5 mm, consists of an adapter body (2) and a gasket (3) (Fig. 2-4).

1. The adapter body (2) can be made of materials that meet the established requirements [GOST R 12.4.214-99 Occupational safety standards system (OSSS). Personal respiratory protective equipment. Thread for face pieces. Standard threaded connection], including materials based on industrial plastics, such as polyethylene terephthalate glycol, high-density polyethylene, polypropylene, Xenoy® resins and (or) their combinations.

The adapter body (2) has an external diameter of 81 mm, the flange (4) is 9 mm high, and the flange (4) thickness is 2 mm.

On the outer side of the adapter body (2) there are two stops (5), made in the form of semi-ovals, 3 mm thick, designed for ease of installation and removal of the designed adapter on (c) filter (a).

In the middle of the adapter body there is a through hole with a diameter of 34 mm, made in the form of an external threaded fastening with a thread height of 15 mm, corresponding to the requirements of GOST 8762-75 (6) (Fig. 2, 4):

nominal thread diameter - 40 mm;

thread pitch - 4 mm;

rounding radius - 1.25 mm;

smallest outer diameter, d - 39.55 mm;

largest outer diameter, d - 39.90 mm;

largest internal diameter, d ₁ - 37.90 mm.

On the inside of the adapter body (2) there is a pad for the gasket (7), on which the gasket (3) is installed (Fig. 3).

2. The gasket (3) can be made of materials that meet the established requirements [GOST 481-80. Paronite and gaskets made of it. Specifications and GOST 7338-77. Rubber and rubber-fabric plates. Specifications], including established rubber standards or thermosetting silicone materials ELASTOSIL LR 3070 from Wacker-Silicones (Munich, Germany); series KE2095 or KE2009 (such as, for example, KE2095-60, KE2095-50, KE2095-40) or X-34-1547A/B, X-34-1625A/B, X-34-1625A/B.

The gasket (3) has a ring-shaped solid shape, in vertical section it is rectangular, the inner diameter is 71 mm, the outer diameter is 77 mm, the thickness of the gasket (3) is 1.5 mm (Fig. 3).

The gasket (3) is installed on the gasket pad (7) of the adapter body (2) without the use of glue or other chemicals (compositions).

The gasket (3) is designed to ensure a tight connection between the filter with an external diameter of 82.5 mm and the adapter body (2).

The method of safely connecting a filter with an external diameter of 82.5 mm to an internal threaded fastening of the face part of a filtering respiratory protective device that meets the requirements of GOST 8762-75 is implemented using the developed adapter and includes the following steps:

at the first stage, the adapter is combined with the edge (1) of the filter, which has an external diameter of 82.5 mm (Fig. 5);

at the second stage, press the adapter from both sides in the places where the two stops (5) are located until it clicks (Fig. 6, 7);

At the third stage, screw the adapter with the installed filter, with an external diameter of 82.5 mm, clockwise until it stops in the internal threaded mount of the filtering RPE, which meets the requirements of GOST 8762-75 (Fig. 8).

4. Brief description of drawings and other graphic materials

Fig. 1. Image of a combined filter with an external diameter of 82.5 mm, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC.

In Fig. 1 the following designations are used:

D ₁ - outer diameter of filter brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC;

D ₂ - the outer diameter of the filter brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC in the groove area;

D ₃ - the outer diameter in the area of the filter rim, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC;

1 - filter flange, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC.

Fig. 2. Adapter connecting the internal threaded fastening of the face part of the filtering RPE and the filter having an external diameter of 82.5 mm (side view).

In Fig. 2 the following notations are used:

2 - adapter body;

4 - side;

5 - stop (total - 2 pcs.);

6 - external threaded fastening with a thread height of 15 mm, corresponding to the requirements of GOST 8762-75.

Fig. 3. Adapter connecting the internal threaded fastening of the face part of the filtering RPE and the filter, which has an external diameter of 82.5 mm (inside view).

In Fig. 3 the following notations are used:

2 - adapter body;

3 - gasket;

5 - stop (total - 2 pcs.);

7 - laying area.

Fig. 4. Axonometric vertical section of the adapter connecting the internal threaded fastening of the face part of the filtering RPE and the filter, which has an external diameter of 82.5 mm.

In Fig. 4 the following notations are used:

2 - adapter body;

3 - gasket;

6 - external threaded fastening with a thread height of 15 mm, corresponding to the requirements of GOST 8762-75.

Fig. 5. Image of the combination of the developed adapter and a combined filter with an external diameter of 82.5 mm, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC.

Fig. 6. Image of the connection of the developed adapter and combined filter with an external diameter of 82.5 mm, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC.

Fig. 7. Image of a combined filter with an external diameter of 82.5 mm, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC with a developed adapter connected.

Fig. 8. Image of the PMK-S filter gas mask with an installed adapter and a filter with an external diameter of 82.5 mm, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC.

Fig. 9. Image of the PMK-S filter gas mask with two installed adapters and two filters with external diameters of 82.5 mm, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC.

5. Implementation of the invention

The declared adapter connecting the internal threaded fastening of the face part of the filtering RPE and the filter with an external diameter of 82.5 mm was manufactured using 3D printing (3D printer, model Anycubic i3 Mega-S). PETG plastic was used as the material for manufacturing the adapter body (2).

The gasket (3) was made of rubber by hand cutting. The gasket (3) was installed on the gasket pad (7) of the adapter body (2) without using glue or other chemicals (compositions).

The tightness of the developed adapter, connecting the internal threaded fastening of the face part of the filtering RPE and the filter, which has an external diameter of 82.5 mm, was tested in a tent for testing gas masks using the standard method used in the troops of the National Guard of the Russian Federation for testing gas masks.

The PMK-S gas mask was used as a filter gas mask, on the left side of the face part of which a developed adapter with a filter with an external diameter of 82.5 mm of the A1B1E1K1P1RD brand, manufactured by Briz-Kama LLC, was installed (Fig. 8).

To test the developed adapter for leaks, chlorobenzalmalonodinitrile (CS) aerosol was used as a test substance. During the tests, no suction of CS into the respiratory organs or eyes was recorded. A conclusion was made about the leaks of the developed adapter connecting the internal threaded fastening of the face part of the filtering RPE and the filter with an external diameter of 82.5 mm.

Claims (1)

An adapter for connecting an internal threaded fastening of the face part of a filtering personal respiratory protective device and a filter having an external diameter of 82.5 mm, comprising an adapter body with an external diameter of 81 mm, consisting of a rim with a height of 9 mm and a thickness of 2 mm, two stops made in the form of semi-ovals with a thickness of 3 mm, an external threaded fastening with a nominal thread diameter of 40 mm, a thread pitch of 4 mm and a rounding radius of 1.25 mm, a gasket having an annular solid shape, in a vertical section - a rectangle, an internal diameter of 71 mm, an external diameter of 77 mm, a thickness of 1.5 mm and installed on a pad for the gasket made on the inside of the adapter body.