BREATHING MASK WITH EMERGENCY BREATHING VALVE

摘要

A breathing mask has a mask body surrounding a cavity that is open towards one side and is intended for coming into contact with a human face around the mouth and/or nose. A valve arrangement is provided in the mask body with an inspiration valve, for controlling the flow of gas from a port for a breathing gas feed device for providing a breathing gas into the cavity, and an exhalation valve for controlling the flow of gas from the cavity into the surrounding atmosphere. An emergency breathing valve, controlling gas flow from the atmosphere surrounding the breathing mask into the cavity, has a pressure threshold, to allow gas flow, that is lower than an inhalation valve pressure threshold. The pressure thresholds at which the respective inhalation valve and the emergency breathing valve open are coordinated by the closing element being designed as a separate component of the valve arrangement.

主权项

1. A breathing mask comprising:
a mask body, which surrounds a cavity that is open towards one side and which is intended for coming into contact with a human face around the mouth and/or nose thereof, wherein the mouth and/or nose may be arranged in the cavity; a feed port for connecting a breathing gas feed device for feeding gas into the cavity; a valve arrangement comprising an exhalation valve for controlling the flow of gas from the cavity into atmosphere surrounding the breathing mask and an emergency breathing valve for controlling the flow of gas from the atmosphere surrounding the breathing mask into the cavity, wherein: the exhalation valve comprises a closing body for closing an exhalation valve opening and the exhalation valve is adapted such that the exhalation valve opens when the pressure in the cavity is above the pressure of the atmosphere surrounding the breathing mask by a preset value; the emergency breathing valve is adapted such that the emergency breathing valve opens when pressure in the cavity is below pressure of the atmosphere surrounding the breathing mask by a preset value; the emergency breathing valve comprises a diaphragm element, which is provided with a diaphragm opening, which forms a gas connection between the cavity and the atmosphere surrounding the breathing mask; the emergency breathing valve further comprises a closing element with a closing surface, which closing element is flexible such that the closing element is deformable between an open position, in which the closing surface is located at a spaced location from the diaphragm element, so that flow of gas through the opening is allowed, and a closed position, in which the closing surface is in contact with the diaphragm element, so that the closing element closes the diaphragm opening to the atmosphere surrounding the breathing mask and flow of gas through the diaphragm opening is prevented from occurring; and the closing element is a separate component of the valve arrangement.