RU2834056C1 - Modular adapter for front part “мб - 2” of filtering gas mask “пмк - 3” - Google Patents

Abstract

FIELD: breathing masks or helmets.

SUBSTANCE: present invention relates to gas mask equipment, to parts of gas masks. Modular adapter for the front part of the “МБ – 2” of filtering gas mask “ПМК – 3” contains a nut with an outer diameter of 59.5 mm and height of 10.5 mm, on the outer side of which there are trapezoidal projections, and containing an internal thread with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, replaceable nozzle consisting of a side, a rubber petal of inhalation, an attachment for a rubber petal of inhalation, a gasket made of an annular shape and a rectangular cross-section, with inner diameter of 27 mm, outer diameter of 40 mm and thickness of 2 mm, nozzle body, in which there is an internal thread with a nominal thread diameter of 40 mm, a thread pitch of 4 mm, a thread rounding radius of 1.25 mm, the smallest inner diameter of 38.41 mm, the largest inner diameter of 38.06 mm and the smallest outer diameter of 40.06 mm, and an external thread with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, by means of which the replaceable nozzle has the possibility of a threaded connection with said nut, replaceable nozzle consisting of a side, a rubber petal of inhalation, an attachment for a rubber petal of inhalation, a gasket made of an annular shape and a rectangular cross-section, with inner diameter of 27 mm, outer diameter of 40 mm and thickness of 2 mm, nozzle body, in which there is an internal thread with a thread pitch of 3.629 mm, a thread rounding radius of 1.225 mm, a thread profile height of 0.8 mm, the smallest inner diameter of 38.56 mm, the largest inner diameter of 38.86 mm, the smallest outer diameter of 40.16 mm, and an external thread with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, by means of which the replaceable nozzle has the possibility of a threaded connection with said nut, replaceable nozzle with a vertical through channel, consisting of a side, a rubber petal of inhalation, an attachment for a rubber petal of inhalation, a gasket made of an annular shape and a rectangular cross-section, with inner diameter of 19 mm, outer diameter of 40 mm and thickness of 2 mm, nozzle body, on which there is an external thread with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, by means of which the replaceable nozzle has the possibility of a threaded connection with said nut, and an external bayonet mount in the form of a circle with an outer diameter of 21 mm, an inner diameter of 15 mm and three trapezoidal projections, two of which have width of 7 mm in the widest part of the projections, and the third projection has width of 5 mm in its widest part, wherein the height of all three protrusions is 3 mm relative to the outer diameter of the bayonet attachment, a replaceable nozzle with a vertical through channel, consisting of a collar, a rubber petal for inhalation, an attachment for a rubber petal for inhalation, ring-shaped gasket with rectangular cross-section, with inner diameter of 25 mm, outer diameter of 42 mm and thickness of 2 mm, nozzle body, on which there is an external thread with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, by means of which the replaceable nozzle has the possibility of a threaded connection with said nut, and an external bayonet mount, which is a circle with an outer diameter of 25 mm, with an inner diameter of 18.5 mm with three trapezoidal projections, two of which have width of 7 mm in the widest part of the projections, and the third projection has width of 5.5 mm in its widest part, wherein height of all three projections makes 3 mm relative to outer diameter of bayonet mount.

EFFECT: providing a safe and tight connection between the front part of the filtering gas mask and filters having an external threaded attachment with a thread diameter of 40 mm and thread parameters corresponding to the requirements of GOST 8762-75, or an external threaded fastener with a thread diameter of 40 mm and thread parameters corresponding to the requirements of EN 148-1:1999 standard, or internal bayonet connections of 3M, JETA SAFETY standard and their analogues, or internal bayonet connections of MSA, UNIX standard and their analogues.

1 cl, 14 dwg

Description

1. Field of technology to which the invention relates

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

The Sushchenko-Bolyasov modular adapter (hereinafter referred to as the modular adapter) for a filter gas mask connects the face part of the filter gas mask and filters that have:

external threaded fastening with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 [GOST 8762-75. Interstate standard. Round thread with a diameter of 40 mm for gas masks and gauges for it. Main dimensions];

external threaded fastening with a thread diameter of 40 mm and thread parameters complying with the requirements of standard EN 148-1:1999 [EN 148-1:1999 Respiratory protective devices - Threads for facepieces - Part 1: Standard thread connection];

internal bayonet connections of 3M, JETA SAFETY and their analogues;

internal bayonet connections of MSA, UNIX and their analogues standards.

The modular adapter includes a nut (1) and replaceable nozzles (2-5), which consist of nozzle bodies (9, 15, 16, 22), rubber inhalation petals (8) and gaskets (10, 17, 23).

In total, the complete set of the modular adapter for the filter gas mask includes 2 nuts (1) and 8 replaceable nozzles (2 nozzles (2), 2 nozzles (3), 2 nozzles (4) and 2 nozzles (5) (Fig. 1):

a nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2);

a nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that comply with the requirements of standard EN 148-1:1999 (3);

a nozzle for connecting a filter with internal bayonet connections of the 3M, JETA SAFETY and their analogues standard (4);

a nozzle for connecting a filter with internal bayonet connections of the MSA, UNIX and their analogues standard (5).

The technical result is to ensure a safe and hermetic connection between the face part of the filter gas mask and filters having:

external threaded fastening with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75;

external threaded fastening with a thread diameter of 40 mm and thread parameters that comply with the requirements of standard EN 148-1:1999;

internal bayonet connections of 3M, JETA SAFETY and their analogues;

internal bayonet connections of MSA, UNIX and their analogues standards.

2. State of the art

An adapter is known from the prior art that connects the face part of the MB-2 filter gas mask PMK-3 with an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 [General-purpose filter gas mask PMK-3. Operation manual. EKCT. 061438.010.000RE. M.: 2000, - 42 p.]. The adapter is inserted into the left or right opening of the face part of the filter gas mask PMK-3, and is fixed from the inside with a standard fairing from the PMK-3 filter gas mask kit.

This adapter is the closest analogue (prototype) to the developed modular adapter for a filter gas mask.

The disadvantages of the standard adapter for the PMK-3 filter gas mask include the fact that this adapter is intended only for use with external threaded fastening of filters with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75.

3. Disclosure of the essence of the invention

The technical problem solved by the invention is to ensure the possibility of safe use of filters of various standards with the face part of a filter gas mask, namely:

with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75;

with a thread diameter of 40 mm and thread parameters that comply with the requirements of standard EN 148-1:1999;

with internal bayonet connections of 3M, JETA SAFETY and their analogues;

with internal bayonet connections of MSA, UNIX and their analogues standards.

The technical result is to ensure a safe and hermetic connection between the face part of the filter gas mask and filters having:

external threaded fastening with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75;

external threaded fastening with a thread diameter of 40 mm and thread parameters that comply with the requirements of standard EN 148-1:1999;

internal bayonet connections of 3M, JETA SAFETY and their analogues;

internal bayonet connections of MSA, UNIX and their analogues standards.

Composition of the modular adapter.

The modular adapter for the filter gas mask includes a nut (1), which is a common fastening for replaceable attachments (2-5) and the replaceable attachments themselves (2-5) (Fig. 1):

nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2);

nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that comply with the requirements of standard EN 148-1:1999 (3);

nozzle for connecting a filter with internal bayonet connections of the 3M, JETA SAFETY and their analogues standard (4);

nozzle for connecting a filter with internal bayonet connections of the MSA, UNIX and their analogues standard (5).

In total, the complete set of the modular adapter for the filter gas mask includes 2 nuts (1) and 8 replaceable nozzles (2 nozzles (2), 2 nozzles (3), 2 nozzles (4) and 2 nozzles (5) (Fig. 1).

The complete set of the modular adapter is designed so that two identical filters can be used simultaneously with the face part of the filter gas mask.

Let's take a closer look at each element of the modular adapter for a filter gas mask.

1. The nut (1) is a common fastener for all types of attachments (2-5) (Fig. 2).

The nut (1) is made of materials based on industrial plastics such as polyethylene terephthalate glycol, high-density polyethylene, polypropylene.

The nut (1) can be manufactured using conventional or injection molding, as well as additive technologies.

The nut (1) has the following dimensions:

outer diameter - 59.5 mm;

height - 10.5 mm.

The nut (1) contains an internal threaded connection (6) with a nominal thread diameter of 47 mm and a thread pitch of 2 mm (Fig. 3).

On the outside of the nut (1) there are 8 trapezoidal projections (7), which provide air supply to the under-mask space of the PMK-3 gas mask.

2. A nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2) (Fig. 2, 3) consists of:

a) nozzle body (9);

b) rubber inhalation petal (8);

c) gaskets (10).

The nozzle body (9) has the following dimensions:

height - 17 mm;

the outer diameter on the connection side of the external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 - 52 mm.

The nozzle body (9) includes:

internal threaded connection (11) that meets the requirements of GOST 8762-75: nominal thread diameter - 40 mm, thread pitch - 4 mm, thread rounding radius - 1.25 mm, smallest internal diameter - 38.41 mm, largest internal diameter - 38.06 mm, smallest external diameter - 40.06 mm;

external threaded fastener (12), which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm;

mount for rubber inhalation petal (13);

side (30).

The body of the nozzle (9) is 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 rubber inhalation petal (8) is standard and has a diameter of 35 mm.

The gasket (10) has a ring-shaped solid shape, a rectangle in vertical section, internal diameter - 27 mm, external diameter - 40 mm, thickness - 2 mm.

The gasket is 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 (10) is installed in a special recess in the nozzle body (9) without using glue.

3. The nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of standard EN 148-1:1999 (3) (Fig. 4) has the same composition and dimensions, is made of the same material (including the gasket) as the nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2), with the exception of the parameters of the internal threaded connection (14) of the nozzle body (15).

The internal threaded connection (14) of the nozzle body (15) complies with the requirements of standard EN 148-1:1999:

thread pitch - 3.629 mm;

thread rounding radius - 1.225 mm;

thread profile height - 0.8 mm;

smallest internal diameter - 38.56 mm;

largest internal diameter - 38.86 mm;

smallest outer diameter - 40.16 mm.

The order of connection to the face part of the filter gas mask and the attachment for connecting the external threaded filter mount with a thread diameter of 40 mm and thread parameters corresponding to the requirements of GOST 8762-75 (2), the attachment for connecting the external threaded filter mount with a thread diameter of 40 mm and thread parameters corresponding to the requirements of the standard EN 148-1:1999 (3) is the same, as follows (Fig. 5):

take the nozzle (2 or 3) in your hand and insert the side containing the external threaded fastening (12) of the nozzle (2 or 3) into the opening on the right/left of the front part of the filter gas mask until it stops (Fig. 5, pos. A, B, C);

take the nut (1) in your hand and, from the back side of the front part of the filter gas mask, screw it clockwise until it stops in the external threaded fastening (12) of the attachment (2 or 3) (Fig. 5, pos. D).

To use the designed modular adapter for its intended purpose, it is necessary to screw the gas mask filter into the attachment (2 or 3) fixed in the front part of the filter gas mask clockwise until it stops.

The attachment (2, 3) can be connected to the right, left or both right and left of the face part of the filter gas mask. The options for using the attachments (2, 3) with the face part of the PMK-3 filter gas mask and a filter with a thread diameter of 40 mm and thread parameters corresponding to the requirements of GOST 8762-75, a filter with a thread diameter of 40 mm and thread parameters corresponding to the requirements of the EN 148-1:1999 standard are shown in Fig. 6.

If 1 nozzle (2, 3) is used, then a standard plug is used on the other side of the front part of the filter gas mask (Fig. 6).

4. The nozzle for connecting a filter with internal bayonet connections of the 3M, JETA SAFETY standard and their analogues (4) (Fig. 7, 8) consists of:

a) nozzle body (16);

b) rubber inhalation petal (8);

c) gaskets (17).

The nozzle body (16) has the following dimensions:

height - 22 mm;

outer diameter - 52 mm.

The nozzle body (16) includes:

external threaded fastener (18), which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm;

mount for rubber inhalation petal (19);

vertical passage channel (20), has an internal diameter of 15 mm, it is designed to move air that has passed through the filter to the front part of the filter gas mask;

the external bayonet mount of the 3M, JETA SAFETY standard and their analogues (21) is a circle with an external diameter of 21 mm, an internal diameter of 15 mm with three trapezoidal projections, two of which are 7 mm wide at the widest part of the projections and 5 mm - the width of the third projection at its widest part; the height of all three projections is 3 mm relative to the external diameter of the bayonet mount;

side (31).

The nozzle body is 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 rubber inhalation petal (8) is standard and has a diameter of 35 mm.

The gasket (17) has a ring-shaped, solid shape, a rectangle in vertical section, internal diameter - 19 mm, external diameter - 40 mm, thickness - 2 mm.

The gasket is 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 order of connection to the face part of the filter gas mask and the attachment for connecting the filter, which has internal bayonet connections of the 3M, JETA SAFETY standard and their analogues (4), is as follows (Fig. 9):

Take a bayonet filter of the 3M, JETA SAFETY standard and their analogues in your hand and insert the attachment (4) into the bayonet hole of the filter with the outer bayonet mount (21) and turn it clockwise until it stops (Fig. 9, pos. A, B).

bayonet filter of 3M, JETA SAFETY standard and their analogues with the installed nozzle (4) (Fig. 9, pos. B) insert with the external threaded fastening (18) of the nozzle (4) into the opening on the right/left of the front part of the filter gas mask until it stops (Fig. 9, pos. C);

take the nut (1) in your hand and, from the back side of the front part of the filter gas mask, screw it clockwise until it stops in the external threaded fastening (18) of the attachment (4) (Fig. 9, pos. D).

The nozzle (4) can be connected to the right, left or both right and left of the face part of the filter gas mask.

Options for using the attachment (4) with the face part of the PMK-3 gas mask and 3M standard bayonet filters are shown in Fig. 10.

If 1 nozzle (4) is used, then a standard plug is used on the other side of the front part of the filter gas mask (Fig. 10, pos. B, C).

5. The nozzle for connecting a filter with internal bayonet connections of the MSA, UNIX and their analogues standard (5) (Fig. 11, 12) consists of:

a) nozzle body (22);

b) rubber inhalation petal (8);

c) gaskets (23).

The nozzle body (22) has the following dimensions:

height - 22 mm;

outer diameter - 52 mm.

The nozzle body (22) includes:

external threaded fastener (24), which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm;

mount for rubber inhalation petal (25);

vertical passage channel (26), has an internal diameter of 18.5 mm, it is designed to move air that has passed through the filter to the face of the filter gas mask;

the external bayonet mount of the MSA, UNIX and their analogues standard (27) is a circle with an external diameter of 25 mm, an internal diameter of 18.5 mm with three trapezoidal projections, two of which are 7 mm wide at the widest part of the projections and 5.5 mm is the width of the third projection at its widest part; the height of all three projections is 3 mm relative to the external diameter of the bayonet mount;

side (32).

The nozzle body is 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 rubber inhalation petal (8) is standard and has a diameter of 35 mm.

The gasket (23) has a ring-shaped, solid shape, a rectangle in vertical section, internal diameter - 25 mm, external diameter - 42 mm, thickness - 2 mm.

The gasket is 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 order of connection to the face part of the filter gas mask and the attachment for connecting the filter, which has internal bayonet connections of the MSA, UNIX standard and their analogues (5), is the same as for the attachment (4) (Fig. 9).

The nozzle (5) can be connected to the right, left or both right and left of the face part of the filter gas mask.

Variants of using the attachment (5) with the face part of the PMK-3 gas mask and UNIX standard bayonet filters are shown in Fig. 13.

If 1 nozzle (5) is used, then a standard plug is used on the other side of the front part of the filter gas mask (Fig. 13, pos. B, C).

The sealing between the nut (1) and the replaceable attachments (2-5) of the developed modular adapter is ensured by means of a threaded connection and the design of the openings of the front part of the filter gas mask, which have a smaller diameter (35 mm) in relation to the diameter of the external thread (47 mm) of the housings of the replaceable attachments (2-5), as well as a thickening along the entire diameter of the opening on the inside of the front part of the filter gas mask (28), which acts as a gasket between the nut (1), the front part of the filter gas mask (29) and the rim (30-32) of the housings of the attachments (2-5) (Fig. 14).

4. Brief description of drawings and other graphic materials

Fig. 1. General view and complete composition of the modular adapter kit.

In Fig. 1 the following designations are used:

1 - nut;

2 - a nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75;

3 - nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that comply with the requirements of standard EN 148-1:1999;

4 - nozzle for connecting a filter with internal bayonet connections of the 3M, JETA SAFETY standard and their analogues;

5 - nozzle for connecting a filter with internal bayonet connections of the MSA, UNIX and their analogues standard.

Fig. 2. General view of the attachment for connecting the external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 and a nut.

In Fig. 2 the following notations are used:

1 - nut;

7 - trapezoidal protrusion on the nut (8 pieces in total);

8 - rubber inhalation petal;

9 - nozzle body (2);

10 - gasket;

11 - internal threaded connection that meets the requirements of GOST 8762-75: nominal thread diameter - 40 mm, thread pitch - 4 mm, thread rounding radius - 1.25 mm, smallest internal diameter - 38.41 mm, largest internal diameter - 38.06 mm, smallest external diameter - 40.06 mm;

12 - external threaded fastening, which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm;

13 - fastening for the rubber inhalation petal;

30 - rim of the nozzle body.

Fig. 3. Axonometric vertical section of the nozzle for connecting the external threaded fastening of the filter with a thread diameter of 40 mm and thread parameters corresponding to the requirements of GOST 8762-75 and a nut along the central axial line.

In Fig. 3 the following notations are used:

1 - nut;

6 - internal threaded connection of the nut, with a nominal thread diameter of 47 mm and a thread pitch of 2 mm;

7 - trapezoidal protrusion on the nut (8 pieces in total);

8 - rubber inhalation petal;

9 - nozzle body (2);

11 - internal threaded connection that meets the requirements of GOST 8762-75: nominal thread diameter - 40 mm, thread pitch - 4 mm, thread rounding radius - 1.25 mm, smallest internal diameter - 38.41 mm, largest internal diameter - 38.06 mm, smallest external diameter - 40.06 mm;

12 - external threaded fastening, which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm.

Fig. 4. General view of the nozzle for connecting the external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of standard EN 148-1:1999 and a nut.

In Fig. 4 the following notations are used:

14 - internal threaded connection, complies with the requirements of EN 148-1:1999: thread pitch - 3.629 mm, thread curvature radius - 1.225 mm, thread profile height - 0.8 mm, smallest internal diameter - 38.56 mm, largest internal diameter - 38.86 mm, smallest external diameter - 40.16 mm;

15 - nozzle body (3).

Fig. 5. Image of the sequence of the order of connecting to the face part of the PMK-3 filter gas mask the attachment for connecting the external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2).

In Fig. 5 the following notations are used:

A, B - image of the order of connecting to the outer side of the face part (on the right) of the PMK-3 filter gas mask a nozzle for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2);

C, D - image of the order of fastening on the inside of the front part of the PMK-3 filter gas mask of the attachment for connecting the external threaded filter mount with a thread diameter of 40 mm and thread parameters corresponding to the requirements of GOST 8762-75 (2) with a nut.

Fig. 6. Image of the PMK-3 filter gas mask with installed modular adapters (nozzles 2, 3 are used) and filters for gas masks.

In Fig. 6 the following notations are used:

A - image of the PMK-3 filter gas mask with installed modular adapters (2 attachments are used to connect the external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2)) and 2 combined filters BRIZ-3001 A1B1E1K1P1RD installed on the right and left of the front part of the PMK-3 gas mask;

B, C - image of the PMK-3 filter gas mask with an installed modular adapter (1 nozzle is used to connect the external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2)) and 1 combined filter BRIZ-3001 A1B1E1K1P1RD, installed on the right and left of the front part of the PMK-3 gas mask;

D - image of the PMK-3 filter gas mask with installed modular adapters (2 attachments are used to connect the external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of the EN 148-1:1999 (3) standard) and 2 OF-07 M (A2B2E1SXP3DR) combined filters installed on the right and left of the front part of the PMK-3 gas mask;

E, F - image of the PMK-3 filter gas mask with an installed modular adapter (1 nozzle is used to connect the external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of the EN 148-1:1999 (3) standard) and 1 combined filter OF-07 M (A2B2E1SXP3DR) combined filter, installed on the right and left of the front part of the PMK-3 gas mask.

Fig. 7. General view of the nozzle for connecting a filter with internal bayonet connections of the 3M standard, JETA SAFETY and their analogues, and a nut.

In Fig. 7 the following notations are used:

16 - nozzle body (4);

17 - gasket;

18 - external threaded fastener, which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm;

21 - external bayonet mount of the 3M, JETA SAFETY standard and their analogues is a circle with an external diameter of 21 mm, an internal diameter of 15 mm with three trapezoidal protrusions, two of which have a width of 7 mm at the widest part of the protrusions and 5 mm - the width of the third protrusion at its widest part; the height of all three protrusions is 3 mm relative to the external diameter of the bayonet mount;

31 - rim of the nozzle body.

Fig. 8. Axonometric vertical section of the nozzle for connecting a filter with internal bayonet connections of the 3M, JETA SAFETY standard, their analogues and a nut.

In Fig. 8 the following notations are used:

8 - rubber inhalation petal;

17 - gasket;

18 - external threaded fastener, which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm;

19 - fastening for the rubber inhalation petal;

20 - vertical passage channel, has an internal diameter of 15 mm, it is designed to move air that has passed through the filter to the front part of the filter gas mask.

Fig. 9. Image of the sequence of the order of connecting to the face part of the PMK-3 filter gas mask the attachment for connecting the filter, which has internal bayonet connections of the 3M, JETA SAFETY standard and their analogues (4).

In Fig. 9 the following notations are used:

A, B - image of the order of inserting the nozzle for connecting a filter with internal bayonet connections of the 3M, JETA SAFETY standard and their analogues (4) into the 3 M 6057 (ABE1) filter;

C - image of the front part of the PMK-3 filter gas mask with a modular adapter and an installed 3 M 6057 (AVE1) filter;

D - image of the inner front part of the PMK-3 filter gas mask and the installed modular adapter (from the nut side).

Fig. 10. Image of the PMK-3 filter gas mask with installed modular adapters (nozzle 4 is used) and bayonet filters of the 3M standard.

In Fig. 10 the following notations are used:

A - image of the PMK-3 filter gas mask with installed modular adapters (2 attachments are used to connect filters with internal bayonet connections of the 3M, JETA SAFETY standard and their analogues (4)) and 2 bayonet filters 3M 6057 (AVE1), installed on the right and left of the front part of the PMK-3 gas mask;

B, C - image of the PMK-3 filter gas mask with an installed modular adapter (1 nozzle is used to connect filters with internal bayonet connections of the 3M, JETA SAFETY standard and their analogues (4)) and 1 bayonet filter 3M 6057 (AVE1), installed on the right and left of the front part of the PMK-3 gas mask.

Fig. 11. General view of the nozzle for connecting a filter with internal bayonet connections of the MSA, UNIX standard, their analogues and a nut.

In Fig. 11 the following designations are used:

22 - nozzle body (5);

23 - gasket;

24 - external threaded fastener, which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm;

27 - external bayonet mount of MSA, UNIX standard and their analogues, is a circle with an external diameter of 25 mm, internal diameter of 18.5 mm with three trapezoidal protrusions, two of which have a width of 7 mm at the widest part of the protrusions and 5.5 mm - the width of the third protrusion at its widest part; the height of all three protrusions is 3 mm relative to the external diameter of the bayonet mount;

32 - rim of the nozzle body.

Fig. 12. Axonometric vertical section of the nozzle for connecting a filter, which has internal bayonet connections of the MSA, UNIX standard, their analogues and a nut.

In Fig. 12 the following designations are adopted:

8 - rubber inhalation petal;

23 - gasket;

25 - mount for rubber inhalation petal;

24 - external threaded fastener, which has the following characteristics: nominal thread diameter - 47 mm, number of thread turns - 4, thread pitch - 2 mm;

26 - vertical passage channel, has an internal diameter of 18.5 mm, it is designed to move air that has passed through the filter to the front part of the filter gas mask.

Fig. 13. Image of the PMK-3 filter gas mask with installed modular adapters (nozzle 5 is used) and UNIX standard bayonet filters.

In Fig. 13 the following designations are adopted:

A - image of the PMK-3 filter gas mask with installed modular adapters (2 attachments are used to connect filters with internal bayonet connections of the MSA, UNIX and their analogues (5) standard) and 2 UNIX bayonet filters (DOT eco 120 A2), installed on the right and left of the front part of the PMK-3 gas mask;

B, C - image of the PMK-3 filter gas mask with an installed modular adapter (1 nozzle is used to connect filters with internal bayonet connections of the MSA, UNIX standard and their analogues (5)) and 1 UNIX bayonet filter (DOT eco 120 A2), installed on the right and left of the front part of the PMK-3 gas mask.

Fig. 14. Image of the front part of the PMK-3 filter gas mask with an installed attachment for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2).

In Fig. 14 the following designations are adopted:

A - image of the front part of the PMK-3 filter gas mask with an installed attachment for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2) (external view);

B - image of the front part of the PMK-3 filter gas mask with an installed attachment for connecting an external threaded filter mount with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (2) (inside view).

5. Implementation of the invention

The declared modular adapter was made using 3-D printing (3D printer, Anycubic i3 Mega-S model was used). PETG plastic was used as the material for manufacturing the nozzle bodies and the nut.

Standard rubber petals from the PMK-S gas mask kit were used as rubber inhalation petals.

All gaskets for the nozzle bodies (2-5) were made of rubber using hand cutting.

The tightness of the developed modular adapter was tested in a tent for testing gas masks using the standard method used by the troops of the National Guard of the Russian Federation to test gas masks.

The PMK-3 gas mask was used as a filter gas mask, on the right side of the face part of which a modular adapter was installed and combined filters were connected:

with external threaded fastening with a thread diameter of 40 mm and thread parameters that meet the requirements of GOST 8762-75 (FPK-7PB);

with external threaded fastening with a thread diameter of 40 mm and thread parameters that comply with the requirements of standard EN 148-1:1999 (OF-07 M);

with internal bayonet connection of 3M standard (3M™ 6099 A2B2E2K2HgP3R+Form);

with internal bayonet connection according to MSA standard (A2B2E1K1-P3).

To test the developed modular adapter for leaks, chlorobenzalmalonodinitrile (CS) aerosol was used as a test substance. No CS suction into the respiratory system or eyes was recorded during the tests. A conclusion was made about the leaks of the developed modular adapter.

Claims (6)

Modular adapter for the face part of the MB-2 filter gas mask PMK-3, containing: a nut with an external diameter of 59.5 mm and a height of 10.5 mm, on the outer side of which there are trapezoidal projections, and containing an internal thread with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, a replaceable nozzle consisting of a rim, a rubber inhalation petal, a mount for the rubber inhalation petal, a gasket made in an annular shape and rectangular cross-section, with an internal diameter of 27 mm, an external diameter of 40 mm and a thickness of 2 mm, a nozzle body in which an internal thread is made with a nominal thread diameter of 40 mm, a thread pitch of 4 mm, a thread rounding 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, and an external thread with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, by means of which the replaceable nozzle has the ability to be threadedly connected to the said nut, a replaceable nozzle consisting of a rim, a rubber inhalation petal, a mount for the rubber inhalation petal, a gasket made in an annular shape and rectangular cross-section, with an internal diameter of 27 mm, an external diameter of 40 mm and a thickness of 2 mm, a nozzle body in which an internal thread is made with a thread pitch of 3.629 mm, a thread rounding radius of 1.225 mm, a thread profile height of 0.8 mm, a smallest internal diameter of 38.56 mm, a largest internal diameter of 38.86 mm, a smallest external diameter of 40.16 mm, and an external thread with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, by means of which the replaceable nozzle has the ability to be threadedly connected to the said nut, a replaceable nozzle with a vertical passage channel, consisting of a rim, a rubber inhalation petal, a mount for the rubber inhalation petal, a gasket made in an annular shape and rectangular cross-section, with an internal diameter of 19 mm, an external diameter of 40 mm and a thickness of 2 mm, a nozzle body on which an external thread is made with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, by means of which the replaceable nozzle has the ability to be threadedly connected to the specified nut, and an external bayonet mount in the form of a circle with an external diameter of 21 mm, an internal diameter of 15 mm and three trapezoidal projections, two of which have a width of 7 mm at the widest part of the projections, and the third projection has a width of 5 mm at its widest part, and the height of all three projections is 3 mm relative to the external diameter of the bayonet mount, a replaceable nozzle with a vertical passage channel, consisting of a rim, a rubber inhalation petal, a mount for the rubber inhalation petal, a gasket made in an annular shape and rectangular cross-section, with an internal diameter of 25 mm, an external diameter of 42 mm and a thickness of 2 mm, a nozzle body on which an external thread is made with a nominal thread diameter of 47 mm and a thread pitch of 2 mm, by means of which the replaceable nozzle has the ability to be threadedly connected to the specified nut, and an external bayonet mount, which is a circle with an external diameter of 25 mm, an internal diameter of 18.5 mm with three trapezoidal projections, two of which have a width of 7 mm at the widest part of the projections, and the third projection has a width of 5.5 mm at its widest part, and the height of all three projections is 3 mm relative to the external diameter of the bayonet mount.