RU2480257C2 - Respirator with half-mask with slot-type expiratory valve - Google Patents

Abstract

FIELD: fire-prevention facilities.

SUBSTANCE: invention relates to personal respiratory protective equipment. The respirator consists of two cartridges, a headband and a half mask, valves of inhalation and an exhalation valve, attach fitting of the headband and cartridges attach fittings located on the sides. The half mask obturator is made of elastic material. In the inner part of the plastic housing of the half mask the elastic obturator is fixed. The convex shape of the plastic frame of the headband provides tight fit and fixation on the head. In the headband frame the upper and lower elastic knitted belts are mounted. The cartridges attach fittings are equipped with two adapters and are made in the form of saddles, they provide bayonet connection of the cartridges to the housing of the half mask. The slot-type shape of the expiratory valve has in width two attachment points to the plastic housing of the half mask. The exhalation valve is closed with the streamlined lid with holes for the air passage. The obturation band is identical to the shape of the human face. The respirator headband is connected to the plastic housing of the half mask with the upper and lower elastic belts in four points through the buckles. The latch and the wedge of the buckle of the lower belts provide fixation and adjustment of the belts. For interconnection the lower ends of the belts are equipped with snaps for providing carrying the respirator on the neck.

EFFECT: increased performance characteristics are achieved at simultaneous improvement of protective properties, ergonomics and aesthetics of the product.

2 cl, 8 dwg

Description

The invention relates to personal protective equipment for respiratory organs, such as respirators used to protect against gases, vapors, aerosols in the field of labor protection of industrial workers with harmful working conditions, in agriculture and at home, when working with paints and varnishes, toxic chemicals and fertilizers , as well as the elimination of accidents and disasters.

To date, the respirator RU-60M GOST 17269-71 (the closest analogue to the proposed technical solution) is widely used in industrial production in Russia.

The well-known respirator consists of a rubber half mask with a knitted shutter, a round exhalation valve located at the bottom of the half mask, two plastic cuffs with inhalation valves attached on the sides to the half mask for attaching cartridges, two interchangeable cartridges, and a knitted headband.

This respirator has a number of significant disadvantages.

The part of the half mask adjacent to the face is rigid and does not fit the face shape well enough. This and, in addition, the presence of a knitted obturator, does not allow for good tightness in the contact of the half mask with the face. The exhalation valve is located below, which is an obstacle when the head is tilted down. The material of the half mask does not have hypoallergenic properties, can cause skin irritation, resulting in the need to use a knitted shutter. The change of cartridges, accompanied by the application of considerable effort, is carried out directly on the half mask, since the plastic cuffs are rigidly connected to the half mask body. This creates inconvenience and increases the likelihood of failure of other parts of the respirator. The headband of the respirator is made of knitted materials, does not have a rigid base and, as a result, cannot be firmly fixed to the head. The half mask is connected through attachment points on plastic cuffs with a headband at two points, which cannot contribute to an even distribution of the load on the face along the obturation strip and, as a result, increases the load on the face and worsens the tightness. In addition, the plastic cuffs, although connected with the half mask, are not fixed in the angular position, as a result of which the points of application of force from the headband can have a completely arbitrary position, from which momentary imbalance and distortion of the half mask on the face can occur.

The technical task of the invention is the creation of a respirator with an ergonomic and aesthetic half mask, with high protective properties, a convenient and reliable headband, with a headband that eliminates the distortion of the half mask on the face, with the possibility of using both special cartridges and commercially available FGP-310 GOST 17269- 71.

The specified technical result is achieved by the fact that in a respirator consisting of two cartridges, a headband and a half mask containing an obturator made of elastic material, inhalation valves and an exhalation valve, attachment points of the headband and cartridge mounts located on the sides, the half mask is made in the form of a plastic case with fastening elastic obturator on its inner part, the headband is made in the form of a plastic frame of a convex shape, providing a tight fit and fixation on the convex part of the head, with mounted in it upper and lower elastic knitted belts, cartridge mounts are made in the form of saddles, providing bayonet connection of cartridges with a half-mask body, and are equipped with two adapters, the exhalation valve has an elongated slotted shape with a width of B = 24 ± 2 mm, a height of H = 48 ± 2 mm and two points of attachment to the plastic body of the half mask with a distance between them of L = 20 ± 2 mm and is closed by a streamlined shape with openings for air passage, the elastic shutter is made with the shape of the obturation strip identical to the shape of a person’s face, headband the respirator is connected to the plastic half-mask body by upper and lower elastic knitted belts at four points through buckles, the buckles of the lower belts are equipped with a tongue and wedge regulator to fix and adjust the belts, the lower ends of which are equipped with buttons for connecting them after putting on the respirator ensure that the respirator is carried around the neck if there is no need for respiratory protection.

At least silicone is used as the elastic material of the half mask seal.

The invention is illustrated by drawings, in which Fig. 1 shows a prefabricated design of a general view of a respirator at the moment of connecting a combination of a FGP-310 cartridge and an adapter with a half mask, Fig. 2 - a respirator, side view, Fig. 3 - a respirator, front view, figure 4 - slotted exhalation valve, front view, figure 5 - slotted exhalation valve, side view, figure 6 - respirator in the position for carrying on the neck, figure 7 - connection of the adapter with the serial production cartridge FGP-310 , in Fig.8 - connection of a special cartridge with a half mask.

The respirator consists (figure 1) of a half mask 1, headband 2 and cartridges 3 (the drawing shows one cartridge).

The main elements of the half mask 1 (Fig. 2, Fig. 3) are a plastic casing 4, an obturator 5, fixed in the inner part of the plastic casing 4 by means of a clip 6, inspiration valves 7 (Fig. 3, the second inspiration valve is not shown in the drawing), the valve exhalation 8, saddle 9 (figure 3 shows a section), o-rings 10, o-rings 11 and cover 12.

The half-mask obturator 5 is made of a hypoallergenic elastic material, for example silicone, and has an obturation strip shape that is well compatible with the shape of a person’s face, which increases the integrity of the product. For a better fit to all types of faces, the obturator with a strip of obturation is performed in two sizes - for small and medium face sizes, including teenagers over 12 years old and for large face sizes.

Inspiration valves 7 are fixed in the nodes of the saddles 9. Inspiration valves 7 are used to prevent air from entering the mask space back into the cartridge 3.

The exhalation valve 8 is installed in front of the body 4 of the half mask 1 and has an elongated slit-like shape with a width of B = 24 ± 2 mm, a height of H = 48 ± 2 mm and two points 13 and 14 attached to the plastic body 4 of the half mask 1 with a distance between points 13 and 14 L = 20 ± 2 mm and is closed by a cover 12, made streamlined with holes for air passage.

The presence of two points 13 and 14 of the fastener increases the reliability of fastening, the elongated shape of the valve (Fig. 4 and Fig. 5) with parameters B = 24 ± 2 mm, H = 48 ± 2 mm, L = 20 ± 2 mm provides the required area for normalized exhalation resistance, reducing the width of the front of the half mask 1 to create a streamlined compact ergonomic design.

The exhalation valve 8 serves to cut off the air exhaled from the half mask 1 and to close the under-mask space from the surrounding atmosphere.

The shape and location of the front slit exhalation valve 8 improves the performance of the respirator when the head is tilted down due to the absence of the exhalation valve below.

The tightness of the structure is ensured by pressing the shutter 5 to the housing 4 by the casing 6, by pressing the saddles 9 to the housing 4 and the shutter 5 by the rings 10.

The tightness of the connection of the half mask 1 with cartridges 3 is carried out by the sealing rings 11.

The saddles 9 provide a bayonet connection of cartridges 3 with the housing 4 of the half mask 1.

The cartridges 3 are connected to the half mask 1 by means of an adapter 15 (Fig. 7 - connection of the cartridge 3 with the adapter 15 for connecting the adapter-cartridge set to the housing 4 of the half mask 1). The presence of an additional plastic adapter 15 allows the use of serial cartridges FGP-310.

A plastic adapter 15 (Fig. 7) with a bayonet mount is connected to a cartridge 3, for example FGP-310, by tensioning it on the socket of the cartridge. The combination of cartridge 3, for example FGP-310, and adapter 15 are attached to the body 4 of the half mask 1 in a convenient bayonet manner by combining the protrusions on the saddle 9 of the half mask 1 with cutouts on the adapter 15 and turning the cartridge 3 all the way clockwise (Fig. 1).

The design of the half mask 1 (in the presence of saddles 9 providing a bayonet connection) provides the use of special cartridges 16 with a bayonet mount 17 (Fig. 8), which are mounted by analogy with the combination of the FGP-310 cartridge and adapter 15.

The headband 2 of the respirator (figure 2, figure 3) is made in the form of a plastic frame 18. The plastic frame 18 of the headband 2 (figure 1) is connected to the body 4 of the half mask 1 by the upper 19 and lower 20 belts (figure 2) through the adjusting buckles 21 and 22 (FIG. 3) at four points. The buckles 21 of the lower belts 20 have wedges 23 for fixing the belt 20 when it is tightened and tabs 24 for releasing the belt 20 from fixing after removing the respirator and pulling the belts. At the ends of the lower 20 belts there are buttons 25 (Fig. 3), by means of which the lower 20 belts are connected and form a loop 26 (Fig. 6) for carrying the respirator around the neck.

To fix the adjusting buckles 21 and 22, respectively, of the upper 19 and lower 20 belts (Fig. 3), buttons 27 and 28 are provided to the body 4 of the half mask 1, respectively, and rivets (holnet) 29 are provided for fastening the belts 19 and 20 to the buckles 21 and 22.

The fastening of the headband 2 to the rigid body 4 of the half mask 1 makes the location of the points of application of force unchanged and, as a result, eliminates the distortion of the half mask 1 on the face. The presence of four attachment points smoothes the load distribution along the obturation strip.

The respirator operates as follows.

Air, having been cleaned in filter cartridges 3, enters through the inspiration valve 7 into a sealed mask space, from where it enters the body. When exhaling, the inspiratory valves 7 are in the closed position and prevent air from entering back into the filter cartridges 3. The exhaled air passes through the holes in the front of the housing 4 of the half mask 1, opens the slotted exhalation valve 8, and enters the environment. At the end of the exhalation, the slit valve of the exhalation 8 closes under the action of its own elastic forces.

The proposed design of the respirator has the following advantages:

- the respirator allows the use of not only special cartridges, but also commercially available;

- the presence of a slotted exhalation valve installed in front and a streamlined cover allows you to create a streamlined compact design without unnecessary protruding parts, which helps to improve ergonomic and aesthetic indicators;

- the presence of two attachment points at the slotted valve exhalation increases the reliability of its attachment;

- the presence of tongues and wedges in the design of the adjusting buckles contributes to the reliable fixation and adjustment of the headband belts;

- the presence of a plastic convex frame contributes to a reliable and convenient fixation of the headband on the head;

- the presence of four points of attachment of the headband to the half mask smooths the distribution of the load on the face over the surface of the obturation, which increases usability and protective properties;

- fastening the headband to the rigid plastic body of the half mask eliminates the distortion of the half mask on the face due to momentary imbalance of effort;

- performing a shutter of hypoallergenic material eliminates the effect of skin irritation;

- the performance of the shutter in two sizes ensures the compatibility of the respirator with all types of faces of people over 12 years old.

Claims (2)

1. A respirator consisting of two cartridges, a headband and a half mask containing an obturator made of elastic material, inhalation valves and an exhalation valve, attachment points for the headband and attachment points for the cartridges located on the sides, characterized in that the half mask is made in the form of a plastic case with an elastic shutter secured in its inner part, the headband is made in the form of a convex-shaped plastic frame providing tight fit and fixation on the convex part of the head, with three upper and lower elastic by important belts, the attachment points of the cartridges are made in the form of saddles, providing bayonet connection of the cartridges with the half-mask body, and are equipped with two adapters, while the exhalation valve has an elongated slit-like shape with a width of B = 24 ± 2 mm, a height of H = 48 ± 2 mm and two points fastening to the plastic body of the half mask with a distance between them of L = 20 ± 2 mm and is closed by a streamlined shape cover with openings for air passage, the elastic shutter is made with the shape of the obturation strip identical to the shape of the person’s face, and the headband of the respirator is connected ineno with a plastic half-mask body with upper and lower elastic knitted belts at four points through buckles, the buckles of the lower belts are equipped with a tongue and wedge regulator for fixing and adjusting the belts, the lower ends of which are equipped with buttons for connecting them after putting on the respirator to ensure carrying a respirator in the neck if there is no need for respiratory protection. 2. The respirator according to claim 1, characterized in that at least silicone is used as the elastic material of the half-mask obturator.

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