PL181412B1 - Exhaust valve of a filtering half-mask - Google Patents

Abstract

1. The exhaust valve of the filtering half mask, 57) composed of a valve shaped seat 'Cylindrical sleeve with a collar, inside which are radially located ribs, housings in the shape of a hollow cylinder with one bottom, collar and flexible membrane, characterized in that one end of the ribs (4) the sockets (1) are permanently connected with the pin (5), with the axis of symmetry common to the seat (l) on which the diaphragm sleeve (2) is pressed in too much the face of the seat (1) is peripheral triangular a groove in which a cylindrical projection is recessed located on the face of the diaphragm (2) and running along its edge additionally on the inner cylindrical surface of the housing (3) there is a series of circumferential abutments on the circumferential projection on the outer side the cylindrical face of the socket (1) connecting seat (1) with housing (3), also in the bottom the housing (3) has a series of through holes along the circle

Description

The subject of the invention is the exhaust valve of a filtering half-mask. Filtering half masks, which protect the human respiratory system against the harmful effects of dust and chemicals, are equipped with valves to reduce the flow resistance of exhaled air.

The exhaust valve known from the Polish description of the utility model No. 49914 consists of a base which is a valve seat, a diaphragm and a housing. The disadvantage of this valve is the difficult and unreliable seating of the valve in the mask.

Another valve, known from the Polish description of utility model No. 53865, is also composed of a valve seat, a diaphragm and a cover, the seat and cover being provided with flanges encompassing a portion of the mask around the opening in which the valve is placed. The disadvantage of this valve is the unreliable connection of the cover and the seat by means of a conical pin. In addition, the protrusions on the faces of the seat flanges and shields limit the use of the valve to half masks of the same thickness of the cup. The modernization of this valve, known from the description of the utility model application no. W 101919, in fact increases the reliability of the connection of the seat with the cover, but retains the inconvenience caused by the more complicated structure.

The exhaust valve of the filtering respirator according to the invention is composed of a valve seat, a flexible membrane and a housing. The valve seat is a cylindrical sleeve with a flange, inside which ribs are located radially, one ends of which are permanently connected to the pin, with a common axis of symmetry on which the diaphragm sleeve is pressed, moreover, on the seat face there is a circumferential triangular groove in which there is a countersunk cylindrical projection located on the face of the diaphragm and extending along its edge. The valve housing is shaped like a hollow cylinder with one bottom and a flange, and on the inner cylindrical surface there is a series of circumferential projections abutting a circumferential projection on the external cylindrical surface of the seat, connecting the seat with the housing, moreover, in the bottom of the housing there are a series of through holes arranged along a circle. Additionally, a reflective element is permanently attached to the bottom of the housing or the bottom is covered with a reflective dye.

The valve according to the invention provides high tightness and, moreover, half-masks can be equipped with it, regardless of the thickness of their walls. Placing the air-flow openings 181 412 in the bottom of the housing, and not on its side as in the known solutions, prevents the accumulation of dust inside the valve.

The subject of the invention in an exemplary embodiment is shown in the drawing, which shows the valve in longitudinal section.

The valve is composed of a valve seat 1, a flexible diaphragm 2 and a housing 3. The valve seat 1 is a cylindrical sleeve with a flange inside which ribs 4 are located radially. One ends of the ribs 4 are permanently connected to a pin 5 onto which the membrane sleeve 2 is pressed. On the seat face 1 there is a circumferential triangular groove in which there is a recessed cylindrical projection located on the diaphragm face 2. The valve housing 3 is shaped like a hollow cylinder with one bottom and a flange. On the inner surface of the cylindrical housing 3 there is a series of circumferential projections abutting the circumferential projection on the outer cylindrical surface of the seat 1. Moreover, in the bottom of the housing 3 there are a series of through holes arranged along a circle. Additionally, a reflective element 6 is permanently attached to the housing bottom 3.

181 412

LOlN

Publishing Department of the UP RP. Circulation of 60 copies

Price PLN 2.00.

Claims (2)

Patent claims 1. The exhaust valve of the filtering half-mask, consisting of a valve seat in the shape of a cylindrical sleeve with a flange, inside which ribs are located radially, a hollow cylinder housing with one bottom and a flange, and a flexible membrane, characterized in that one end of the ribs (4) of the seat (1) are permanently connected with the pin (5), with the axis of symmetry shared with the seat (1), on which the diaphragm sleeve (2) is pressed, moreover, on the seat face (1) there is a circumferential triangular groove in which there is a recessed cylindrical projection located on the face of the diaphragm (2) and extending along its edge, additionally on the inner cylindrical surface of the housing (3) are a series of circumferential projections; resting on a circumferential projection on the outer cylindrical surface of the socket (1), connecting the socket (1) with the housing (3), moreover, in the bottom of the housing (3) there are a series of through holes arranged along a circle. 2. The exhaust valve of the filtering half-mask according to Claim The retroreflective element (6) is permanently attached to the housing bottom (3) or the bottom is covered with a reflective dye.