RU2812619C1 - Adapter connecting external bayonet mounting of facial parts of filtering personal respiratory protection equipment with bayonet mounting of anti-aerosol, anti-gas, and combined filters - Google Patents

Abstract

FIELD: personal protection equipment.

SUBSTANCE: invention relates to gas mask equipment, to parts of gas masks, full-face masks, half masks and quarter masks, and additionally includes a gasket that meets the requirements of the labour safety standard. The adapter, designed to connect the bayonet fastening of the front parts of personal respiratory protection filters with the bayonet fastening of anti-aerosol, anti-gas and combined filters, contains a housing, on one side of which there is an external bayonet fastening, which is a circle with an outer diameter of 25 mm, an inner diameter of 22 mm with three trapezoidal projections, two of which are 8.5 mm wide at the widest part of the projections, and the width of the third projection at its widest part is 6 mm, and the height of all three projections is 3 mm relative to the outer diameter of the bayonet mount, on the other side of the body there is a connecting unit with bayonet fastening of the front parts of personal respiratory protection equipment, containing a hole in the form of a circle with a radius of 21.5 mm with three trapezoidal protrusions, two of which have a width of 7.5 mm at the widest part of the protrusions, and the width of the third the protrusion in its widest part is 4.5 mm, and the height of all three protrusions is 3.5 mm, a vertical passage channel made inside the case, a pad for gaskets made on the side of the case with an external bayonet fastening, and a gasket.

EFFECT: safe and hermetically sealed connection of non-standard bayonet fastenings of the front parts of filters for personal respiratory protection of 3M standard, JET A SAFETY, and their analogues with the bayonet fastening of filters of the MSA, UNIX standard and their analogues.

1 cl, 4 dwg

Description

Field of technology to which the invention relates

The present invention relates to gas mask equipment, to parts of gas masks, full-face masks, half masks and quarter masks, and additionally includes a gasket that meets the requirements of the labor safety standard.

The adapter connecting the external bayonet fastening of the front parts of personal respiratory protection filters of the 3M standard, JET A SAFETY and their analogues with the bayonet fastening of anti-aerosol, anti-gas and combined filters of the MSA standard, UNIX and their analogues includes a housing, on one side of which there is an external bayonet fastening, on the other side there is a hole for a bayonet fastening to the front parts of personal respiratory protection filters; inside the body there is a vertical passage channel, in addition, on the side of the body with an external bayonet fastening there is a platform for gaskets and the gasket itself.

State of the art

An adapter is known from the prior art that connects the bayonet fastening of gas masks or respirators with the threaded fastening of gas mask filters or gas mask filter boxes (see patent for invention No. 2719679, published: 04/21/2020 Bulletin No. 12, application registration number 2018122923, application filing date 06/22 .2018, class IPC A62B 18/08), which is the closest analogue of the present invention.

This adapter is intended for the use of filters that have a round threaded connection with the front parts of gas masks, full-face masks with a 3M standard bayonet mount. The adapter provides a sealed connection between the filter and the front part of the personal respiratory protection filter.

The disadvantages of the selected analogue are:

the impossibility of using filters with a bayonet mount standard MSA, UNIX and their analogues, which limits the use of these adapters;

To seal the connection between the filter and the adapter, a gasket is used, which is fixed with glue, so if inhaled, it is possible to be injured by the vapors of toxic substances contained in the glue, which is used to fix the gasket in the proposed adapter.

Disclosure of the invention

The claimed invention is aimed at solving the problem of expanding the functionality of filtering personal respiratory protection equipment having non-standard bayonet fastenings of the 3M standard, JETA SAFETY and their analogues by using filters having bayonet fastenings of the MSA standard, UNIX and their analogues.

The technical result of the claimed invention is to provide a safe and hermetically sealed connection of non-standard bayonet fastenings of the front parts of personal respiratory protection filters of the 3M standard, JETA SAFETY and their analogues with the bayonet fastening of filters of the MSA, UNIX standard and their analogues.

The essence of the invention is presented in Fig. 1, 2, 3, 4, which shows the type of the proposed adapter.

Brief description of drawings and other graphic materials

Fig. 1. General view of the adapter.

In fig. 1 the following designations are adopted:

1 - adapter body (has a height of 15 mm, the outer diameter at the base is 40.4 mm, the outer diameter at the junction with the bayonet mount of the filters is 36.5 mm).

The housing is manufactured from materials that meet specified requirements [1], including materials based on industrial plastics such as polyethylene terephthalate glycol, high-density polyethylene, polypropylene, Xenoy® resins, and/or combinations thereof.

2 - gasket (has a ring-shaped solid shape, rectangular in vertical section, internal diameter - 24.5 mm, external diameter - 42.7 mm, thickness 1.9 mm).

The gasket is made of materials that meet the established requirements of GOST [2, 3], 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-34-1547А/В, Х-34-1625А/В, Х-34-1625А/В.

3 - finger recesses (a total of 14 pieces along the entire outer diameter of the adapter body), designed for easy fixation of the adapter on the external bayonet fastenings of the front parts of personal respiratory protection filters).

4 - external bayonet mount standard MSA, UNIX and their analogues (represents a circle with an outer diameter of 25 mm, an inner diameter of 22 mm with three trapezoidal protrusions, two of which are 8.5 mm wide at the widest part of the protrusions and 6 mm - the width of the third protrusion at its widest part; the height of all three protrusions is 3 mm relative to the outer diameter of the bayonet mount).

5 - vertical passage channel, has an internal diameter of 22 mm, designed for the movement of air passing through the filter to the front part of the filtering personal respiratory protection device.

Fig. 2. Adapter, top view.

In fig. 2 the following notations are adopted:

6 - docking unit with bayonet fastening of the front parts of personal respiratory protection equipment, consists of a hole in the form of a circle with a radius of 21.5 mm, with three trapezoidal protrusions, two of which have a width of 7.5 mm at the widest part of the protrusions and 4, 5 mm is the width of the third protrusion at its widest part; the height of all three protrusions is 3.5 mm).

Fig. 3. Axonometric vertical section of the adapter along the central center line with the gasket.

In fig. 3 the following notations are adopted:

7 - pad for laying (has a ring-shaped solid shape, outer diameter - 40.5 mm, inner diameter - 25 mm, thickness 9 mm).

The laying platform is permanently connected to the upper and lower parts of the adapter body.

No adhesives or other chemical components are used to connect the “gasket” and “layout platform” elements.

Fig. 4. Photographs of images of the 3M 6800 full face mask with developed adapters and various filters.

In fig. 4 the following notations are used:

8 - image of a 3M 6800 full-face mask with developed adapters and gas filters with a UNIX standard bayonet mount (filters DOT ECO 120 A2 (UNIX 502)).

9 - image of a 3M 6800 full-face mask with developed adapters and anti-aerosol filters having a bayonet mount of the MSA standard (MSA 200 P3 filters).

Carrying out the invention

For testing, mock-ups of adapters were made using 3D printing from PETG plastic and standard rubber gaskets.

Testing of mock-ups of adapters connecting the external bayonet mounts of a full-face mask of the 3M 6800 series with bayonet mounts of filters of the MSA and UNIX standard took place on the basis of the Federal State Institution “Main Center for Scientific Research of the Federal Service of the National Guard Troops of the Russian Federation.”

Testing of 3M 6800 full-face masks with mock-up adapters and bayonet combined filters of MSA and UNIX standards for leaks was carried out according to standard methods in tents for checking the serviceability and fitting of gas masks using chlorobenzalmalonodinitrile aerosol. No problematic issues regarding respiratory protection were identified; the tightness of the adapter mock-ups was confirmed experimentally.

Dictionary.

The term “personal respiratory protection equipment” (hereinafter referred to as RPE) means a means worn on a person that ensures the purification of air inhaled from the environment from harmful substances.

Depending on the aggregate state of harmful substances in the ambient air, filtering RPEs are divided into three classes according to their intended purpose: anti-aerosol, anti-gas, anti-gas aerosol (combined).

According to their technical design, filtering RPEs are classified into gas masks (full face masks), respirators (half masks), quarter masks, filtering self-rescuers, and protective kits.

The term "facepiece" means the part of the RPE that connects the wearer's airway to other parts of the device and separates the airway from the surrounding atmosphere. In this case, we are talking about the front parts that fit tightly (mask, half mask, quarter mask) to other parts of the device.

The term “filter” includes anti-aerosol, anti-gas and combined filter.

The term “bayonet fastening” means a quickly performed connection of parts by means of axial movement and rotation (sometimes lateral displacement) of one of them relative to the other, used for fastening the front parts of RPE and filters with a bayonet fastening standard 3M, JETA SAFETY, UNIX, MSA and their analogues .

The term “tight connection” means ensuring that the surfaces and joints of parts are impermeable to gases (vapors) and liquids. Sealing of surfaces is ensured by coating with materials impermeable to gases and liquids. The joints are sealed by using additional parts made of elastic material, or filling the gaps with sealing material.

Bibliography.

1. GOST R 12.4.214-99 System of occupational safety standards (SSBT). Personal respiratory protection. Thread for front parts. Standard threaded connection.

2. GOST 481-80. Paronite and gaskets made from it. Technical conditions.

3. GOST 7338-77 Rubber and rubber-fabric plates. Technical conditions.

Claims (1)

An adapter designed to connect the bayonet fastening of the front parts of personal respiratory protection filters with the bayonet fastening of anti-aerosol, anti-gas and combined filters, characterized in that it contains a housing, on one side of which there is an external bayonet fastening, which is a circle with an outer diameter of 25 mm, with an internal diameter of 22 mm with three trapezoidal projections, two of which are 8.5 mm wide at the widest part of the projections, and the width of the third projection at its widest part is 6 mm, the height of all three projections being 3 mm relative to the outer diameter bayonet fastening, on the other side of the body there is a docking unit with bayonet fastening of the front parts of personal respiratory protection equipment, containing a hole in the form of a circle with a radius of 21.5 mm with three trapezoidal protrusions, two of which are 7.5 mm wide at the widest part protrusions, and the width of the third protrusion at its widest part is 4.5 mm, and the height of all three protrusions is 3.5 mm, a vertical passage channel made inside the case, a pad for gaskets made on the side of the case with an external bayonet mount, and gasket