RU2849503C1 - METHOD FOR CONNECTING FILTER WITH OUTER DIAMETER OF 82.5 mm TO INTERNAL THREADED FASTENING OF FRONT PART OF PERSONAL RESPIRATORY PROTECTION FILTER - Google Patents

Abstract

FIELD: gas protection equipment.

SUBSTANCE: invention relates to gas mask components. A method for connecting a filter with an outer diameter of 82.5 mm to the internal threaded fastening of the front part of a personal respiratory protection filter with a nominal thread diameter of 40 mm, a thread pitch of 4 mm, a thread rounding radius of 1.25 mm, a minimum internal diameter of 38.41 mm, a maximum internal diameter of 38.06 mm, a minimum outer diameter of 40.06 mm, by means of an adapter containing an adapter body with an outer diameter of 81 mm, consisting of a rim with a height of 9 mm and a thickness of 2 mm, two stops in the form of semi-ovals with a thickness of 3 mm, an external threaded connection with a nominal thread diameter of 40 mm, a thread pitch of 4 mm and a rounding radius of 1.25 mm, a gasket mounting surface made on the inside of the adapter body, on which a gasket is installed, having a ring-shaped solid form, in vertical section - a rectangle, an inner diameter of 71 mm, an outer diameter of 77 mm, a thickness of 1.5 mm, includes the following steps: in the first step, the adapter is aligned with the filter rim, which has an outer diameter of 82.5 mm; in the second step, the adapter is pressed against the filter on both sides at the locations of its two stops until it clicks into place; in the third stage, screw the adapter with the installed filter, which has an outer diameter of 82.5 mm, clockwise until it stops in the internal threaded fastening of the personal respiratory protection filter.

EFFECT: ensuring a safe and tight connection between the internal threaded fastening of the front part of the filtering PRPF, in accordance with the requirements of GOST 8762-75, and the filter with an outer diameter of 82.5 mm.

1 cl, 9 dwg

Description

1. The field of technology to which the invention relates

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

2. State of the art

Public information about methods known to the applicants for safely connecting a filter with an external diameter of 82.5 mm to an internal threaded fastening of the face part of a filtering personal respiratory protective equipment (PPE), as well as analogs of the claimed invention, with the selection of an analog closest to the invention (prototype) in terms of its scope of application, in terms of the totality of the functional capabilities declared in the present invention, in terms of the purpose of the claimed invention, coinciding with the purpose of the analogs, has not been identified.

3. Disclosure of the essence of the invention

The technical problem solved by the invention is to develop a method for safely connecting a filter with an external diameter of 82.5 mm to an internal threaded fastener of the facepiece of a filtering respiratory protective device (SIZOD) 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 its gauges. Main dimensions].

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

replaceable gas mask filters for the respirator "BRIZ-2201 (RPG)" of the brands A1, K1, A1B1E1, A1B1E1K1, which are designed to protect the human respiratory system 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)];

Replacement filters for the respirator "BRIZ-3201(RU)" of the brands A1P1 R D, K1P1RD, A1B1E1P1RD, A1B1E1K1P1RD, which are designed to protect the human respiratory system 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 from 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)].

Characteristics of internal threaded fasteners according to GOST 8762-75: nominal thread diameter – 40 mm, thread pitch – 4 mm, thread curvature radius – 1.25 mm, smallest internal diameter – 38.41 mm, largest internal diameter – 38.06 mm, smallest outer diameter – 40.06 mm.

The technical result is to ensure a safe and hermetically sealed connection between the internal threaded fastening of the face part of the filtering respiratory protective equipment, which complies with the requirements of GOST 8762-75, and a filter having an external diameter of 82.5 mm.

In order to implement the claimed method for 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 equipment that meets the requirements of GOST 8762-75, an adapter previously unknown in the state of the art was developed.

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 of [GOST R 12.4.214-99 Occupational safety standards system (OSSS). Personal respiratory protective equipment. Threads for facepieces. Standard threaded connection], including materials based on industrial plastics, such as polyethylene terephthalate glycol, high-density polyethylene, polypropylene, Xenoy® resins, and/or combinations thereof.

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 the (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;

curvature 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 meeting 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 solid annular 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 for safely connecting a filter with an external diameter of 82.5 mm to an internal threaded fastening of the facepiece of a filtering respiratory protective equipment (SIZOD) that meets the requirements of GOST 8762-75 is implemented using a 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 places where 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 fastening 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 – outer diameter of filter brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC in the groove area;

D ₃ – 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, which has 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, type 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 adapter, which connects the internal threaded mount of the filtering respirator facepiece to the filter, which has an external diameter of 82.5 mm, was manufactured using 3D printing (using an Anycubic i3 Mega-S 3D printer). PETG plastic was used for the adapter body (2).

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

The tightness of the developed adapter, connecting the internal threaded fastening of the facepiece of the filtering RPE and the filter, which has an external diameter of 82.5 mm, was tested in a gas mask testing tent using the standard method used by 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 specially developed adapter with a filter with an external diameter of 82.5 mm, brand A1B1E1K1P1RD, manufactured by Briz-Kama LLC was installed (Fig. 8).

To test the leak tightness of the developed adapter, chlorobenzalmalonodinitrile (CS) aerosol was used as a test substance. No CS aspiration into the respiratory system or eyes was detected during the tests. The developed adapter, which connects the internal threaded mount of the filtering RPE facepiece to the filter, which has an external diameter of 82.5 mm, was found to be leak tight.

Claims (4)

A method for connecting a filter having an external diameter of 82.5 mm to an internal threaded fastener of the face portion of a filtering personal respiratory protective equipment having a nominal thread diameter of 40 mm, a thread pitch of 4 mm, a thread curvature radius of 1.25 mm, a smallest internal diameter of 38.41 mm, a largest internal diameter of 38.06 mm, and a smallest external diameter of 40.06 mm by means of an adapter comprising an adapter body with an external diameter of 81 mm consisting of a flange 9 mm high and 2 mm thick, two stops made in the form of semi-ovals 3 mm thick, an external threaded fastener with a nominal thread diameter of 40 mm, a thread pitch of 4 mm and a curvature radius of 1.25 mm, a gasket pad formed on the inside of the adapter body on which a gasket is installed, having an annular solid shape, in vertical section - a rectangle, an internal diameter of 71 mm, an external diameter of 77 mm, thickness of 1.5 mm, including the following steps: At the first stage, the adapter is combined with the edge of the filter, which has an external diameter of 82.5 mm, at the second stage, press the adapter against the filter from both sides in the places where its two stops are located until it clicks, At the third stage, screw the adapter with the installed filter, which has an external diameter of 82.5 mm, clockwise until it stops in the internal threaded fastening of the filtering personal respiratory protective equipment.