JPH06506845A - Protective mask air introduction system and protective mask - Google Patents

Abstract

The object of this invention is a valve arrangement of a protective respirator intended for protecting the wearer against dust or gases. The invention sets out how the exhalation air is guided as soon as possible out of the face section (7) and further how te air can be caused to pass through an air enclosure (11) in between the face section (7) and the frame section (3).

Description

[Detailed description of the invention] The Sky of Masks - Human System and Masks The present invention relates to an air introduction system for a protective mask and to a protective mask.

Protective masks usually protect the user from harmful dust, primarily in industrial and agricultural operations. and gases. Protective masks are also an example at home. For example, it is increasingly used to prevent hay fever. Below is the arrangement of the protective mask valve. This is a description of some alternative solutions.

According to FI patent application No. 833006, the filter bridge type half mass The exhalation valve on the mask allows exhaled air to escape. It is located at an angle at the top of the surface. According to EP patent application fl 258508 and the exhalation and inhalation valves were placed concentrically on the front face area of the mask. . Exhaled air is directed directly from the face into the surrounding air.

One of the major problems with protective masks is the formation of condensed water on the sealing surface of the face area. It is to be done. Excess moisture can lead to the growth of strong bacteria on surfaces that come into contact with the skin , thus causing skin infections and hypersensitivity. Furthermore, in the unlikely event that multiple people take turns, This mask is extremely unhygienic when worn. The formation of condensed water is The temperature of the air outside the facial area of the device is lower than the temperature inside the facial area. wake up. When exhaled air is warm and moist, the surface of the face has a temperature called the dew point. When the temperature drops to a temperature lower than that on which it is applied, it condenses on this surface.

Another serious problem occurs when breathing cold inhaled air at temperatures below zero. Protection Breathing through a protective mask always creates a degree of breathing resistance, so do not use a mask. Generally, people who do ) are forced to breathe in the air using breathing techniques such as

People suffering from asthma are definitely at risk for their health in this condition. .

Temperatures often below zero also cause ice to form in the exhalation valve. This is When you wake up, unfiltered air enters your face in the wrong direction via the exhalation valve. It may leak.

A common drawback in protective masks is wearing the exhaling mask too close to the inhaling population. It is to get out of. This causes the carbon dioxide concentration of the inhaled air to reach an excessive level. There is a risk that the market could rise to a certain level. High carbon dioxide concentration can cause headaches and fatigue. It can cause strain and, in extreme cases, even loss of consciousness. According to experts, carbonate It is said that even at a concentration limit of about 1%, it is still safe to inhale.

Some currently available masks reduce work safety and are not comfortable to wear. The disadvantage is that the user's glasses and safety goggles tend to fog up due to warm, humid exhaled air. It is important to have a direction. This generally means that the exhaled air flows directly from the exhalation valve into the user's glasses or This is because it is possible to be guided without being hindered by Goggle.

The exhalation valve on a typical protective mask is directly adjacent to the surrounding unfiltered air. Because it is on the outside of the mask, due to leakage of the exhalation valve, there is no direct vicinity on the outside of the valve. The unfiltered air at the The result is that along with qi, the amount of energy is absorbed.

The air introduction system of the mask according to the invention provides a decisive improvement over the above-mentioned drawbacks. It is something that brings. In order to carry out these improvements, two protective breathing apparatuses according to the present invention are provided. The air introduction system of a mask of type is characterized by what is stated in claim 1. and the mask is characterized by what is stated in claim 7.

A first advantage of the present invention is that the formation of condensed water on the face sealing surface is significantly reduced. seen in what is done. This warms the intake air, even at sub-zero temperatures. Masks are safe to use 6 In addition, mixing of exhaled air with inhaled air is kept to a minimum. Ru.

In the arrangement according to the invention, due to the position of the exhalation valve, The air that escapes is noticeably cleaner than the air surrounding the mask. Because The undisturbed surrounding air is not in the direct vicinity of the exhalation valve, and the leaked air is mainly This is because the air contains air that has been filtered and then exhaled. ] For example, grain Contaminated air is transported to the frame and face seals than on the outer surface of the mask. It is prettier between parts. This is because the exhaled air is during the user's breathing. It stays around the exhalation valve, and the pressure of the exhaled air removes dirty air. This is because it discharges through the valve opening.

The invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded view of the protective mask.

FIG. 2 is a partial sectional view seen from above the protective mask.

FIG. 3 shows a side view of the protective mask, and partially along line C-C in FIG. The cross section is shown below.

Figures 4a and 4b show two different types of heat exchange surfaces.

FIG. 5 is an isometric assembly view of a mask according to the present invention.

FIG. 1 is a schematic exploded view of a protective mask according to the invention. mask is fill From the lattice part 1 that protects the filter, the filter 2, and the supporting ribs that have air intake holes. a frame part 3 comprising a frame part 3 and a valve flap on which the inhalation and exhalation valves are mounted. connected to the valve frame 4 by the frame 4 and the mask attachment string. These laces are not shown in FIG. 1. Ma The tip of the frame part 3 of the disk accommodates an air guide plate 8.

FIG. 2 shows a partial sectional view of the protective mask seen from above.

The attachment string 3 is shown in broken lines in the figure.

Figure 3 shows the assembled mask placed on the user's face6 The display is a side view and partially shows a cross section taken along line c-cg in FIG. This diagram The face allows warm exhaled air to pass through the exhalation valve 6, through the frame part 3, and into the face area. It is shown how the air is guided into the air-enclosed part 11 of the roll part 7.

Due to the force of convection, the warm exhaled air rises in the enclosed area 11 of air. It rises and hits the air guide plate 8. Air guide plate 8 is the most warm Direct the air backwards and upwards towards the ears of the person wearing the protective mask.

Under these conditions, the flow of warm air will connect the frame of the protective mask and the face. The warm air generated in the enclosed part of the air formed between the sealing part The flow of air makes the temperature within the enclosed area of the air essentially higher than the temperature of the air outside. keep it high. Drawing number 16 shows the removable protective surface.

Warm exhaled air within the enclosed air area reveals the temperature of the outer surface of the facial seal area. Keep above the deer temperature, this will prevent the formation of condensed water on the inner surface of the face seal area. greatly reduced.

The warm exhaled air in the enclosed air section forms the rear surface of the frame section 3 Heat exchange surface 12 also warms. Heat is transferred from the heat exchange surface to the support ribs 13 by conduction. be reached.

When warmed, the support ribs radiate heat into the filtered intake air that flows between the ribs. put out In this way, the temperature of the inhaled air is cool enough to be safe for people suffering from asthma. Ru.

The exhaled air is rich in carbon dioxide in the enclosed air and is essentially mass Since it is ejected from the end of the tank, there is little chance of it being sucked in again. For this reason enhance the safety of using

The guide plate 8 prevents warm air from fogging the glasses or goggles. It will be done.

4a and 4b show another possible solution to the construction of the heat exchange surface 12. shows the law. The frame portion 3 is adjacent to channels 10 in which the ribs carry air. The ribs 13 are formed so that they have essentially the same thickness in the mating positions. . This construction allows for a larger surface area and more uniform frame section thickness. , enabling more efficient heat exchange.

FIG. 5 shows a fixing stand 15 by means of which the grid part 1 is fixed to the frame part. determined. A grid in which the holes 14, which evenly distribute the pressure, are curved under the mask, for example. It can be applied in one part. Once this is done, this pressure is distributed evenly. The holes to be placed are located in the corresponding parts of the frame part 3 when the mask is assembled. Matches the hole made.

Note that the mask according to the invention has been described in connection with only one advantageous embodiment thereof. I want to be noticed. This does not limit the invention to this example only. instead of that All modifications of the inventive device within the scope defined in the patent claims are of course possible. be.

international search report Continuation of front page (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IT, LU, MC, NL, SE), 0A (BF , BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG. ), AT, AU, BB, BG, BR, CA, CH, C3, DE.

DK, ES, Fl, GB, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL, No, PL, RO, RU, SD, SE, US

Claims (1)

[Claims] 1. A system that directs the air in a mask that protects the user from airborne impurities. a face-sealing part (7) made of a rubber-type substance, and a frame part. (3) and the inhalation and exhalation valves (5, 6) connected to the valve frame (4) and the It consists of a filter (2) through which air is drawn into the facial area (7). In the system for guiding the air of the mask, it passes through the exhalation valve (6). The air that is A system for guiding air characterized by being guided by. 2. In the air conducting system of claim 1, the frame portion (3) of the mask is used. The mask is adapted to the contours of the user's face and the frame portion (3) of the mask characterized by comprising a plate (8) directing air directed essentially towards the face of the A system that guides air. 3. In the air-conducting system of claim 1, the exhaled air is heated through the heat exchanger of the frame part (3). It warms the exchange surface 12 and the heat exchange ribs (13), from which heat is released into the intake air. A system for guiding air. 4. In the air guiding system of claim 1, the exhaled air is a face sealing part (7). The part that seals the face (7) by heating the outer surface of the ) an air-conducting system characterized by preventing the formation of condensed water on the inside. 5. In the air guiding system of claim 1, according to the orientation of the heat exchange ribs (13). A system for guiding air, characterized in that a groove or cavity is formed in the rib. 6. In the air-conducting system of claim 1, exhaled air flows essentially through the frame portion (3). ) with a heat exchange surface (12) and a guide plate (8) to guide the flow of exhaled air. A system for directing air, characterized in that it is discharged from the mask in the direction of the surface of the mask. 7. A protective mask intended to protect the user from airborne impurities, with a rubber-like A face sealing part (7) made from a substance, a frame part (3) and a valve flap. Inhalation and exhalation valves (5, 6) connected to the frame (4) and the air flowing into the facial area ( 7) and a filter (2) through which it is inhaled. , the outlet opening of the exhalation valve (6) is located between the frame and the face sealing part (3). , 7), and the inlet opening of the suction valve (5) is located below the filter surface. A protective mask characterized in that the protective mask is located in the arm part (3). 8. A protective mask according to claim 7, in which a heat exchanger forming the other wall of the enclosing portion (11) The exchange surface (12) is connected to heat exchange ribs (13) forming an adjacent piece. A protective mask characterized by. 9. A protective mask according to claim 8, comprising a heat exchange surface (1) facing the surrounding part (11). The side surfaces of 2) are provided with longitudinal grooves and/or which are advantageously open towards the surrounding part (11). A protective mask characterized by containing voids. 10. A protective mask according to claim 8, in which the pressure balancing holes (14) are located in the frame. part (3) and in the outer and/or lower grate (1) of the exhalation valve (6). A protective mask characterized by: