DE1166008B - Breathing gas supply device for high altitude breathing apparatus with a lung-controlled oxygen supply valve - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: A 62 b

Number:
File number:
Registration date:
Display day:

German class: 61 a - 29/04

1 166 008
B 56186 V / 61 a
January 9, 1960
March 19, 1964

The invention relates to a breathing gas supply device for high-altitude breathing apparatus with a lung-controlled one Oxygen supply valve, behind which a jet pump that draws in outside air is arranged and one located at the inlet port for the outside air and controlled by the pressure of the outside air Valve that throttles the opening cross-section when the pressure falls below a certain level begins.

In a known device of this type, be ίο the jet pump is made of rigid material. Since the cross-section of the bore of the jet pump is always the is the same, the oxygen delivery cannot be controlled so precisely at the different altitudes, that only the required amount is delivered. Also, sealants are used to make airtight It is necessary to connect the pump in the housing.

The invention is based on the object of improving the jet pump of the known device in such a way that that it is required at every level Releases the amount of breathable air as precisely as possible, and simplifies the seal. The solution to this problem consists according to the invention that the ■ jet pump made of elastically flexible material exists and is provided on its Emströmseite with a one-piece annular flange between a shoulder formed in the oxygen supply line and the end of a removable one in the line arranged sleeve is clamped. Because the jet pump is made of resilient Material exists, the diameter of the hole adapts itself by increasing or decreasing it the respective breathing air requirement. In addition, the can be made from a one-piece body with Easily produce an existing jet pump with an annular flange. Next is through the flange facilitates airtight fastening in the device.

It is true that jet pumps for liquids made of resilient material are known, However, those with a conically tapered metal jacket slit in the longitudinal direction are provided. This metal jacket makes the jet pump relatively cumbersome Adjust pressure changes. As a result, it is not suitable for high-altitude breathing apparatus. Also requires it is a very precise and cumbersome processing and is therefore relatively expensive in the Manufacturing.

In the drawing is an embodiment of the breathing gas supply device according to the invention shown in section.

Breathing gas supply device

for high-altitude breathing apparatus with a lung-controlled Oxygen supply valve

Applicant:

The Bendix Corporation, New York, N.Y.

(V. St. A.)

Representative:

Dipl.-Ing. H. Beschich, patent attorney,

Regensburg 3 ,prüfunginger Str. 11

Named as inventor:

Raymond Jerome Carolan, Prairie Village, Kan.

and V. St. A.

Claimed priority:

V. St. ν. America March 19, 1959

(No. 800 465)

The housing of the device is denoted by 10. An outside air line 14 is arranged in the housing. 16 is an inlet valve for outside air operated by a barometer can. From the lung-controlled one Oxygen supply valve is shown only the valve closure body 18, which is through a Control membrane is actuated and oxygen can enter the oxygen supply line 12. from a shoulder 20, the conduit has a larger diameter downstream. The ring-shaped one Flange 22 of jet pump 24 is made gas-tight against shoulder 20 by one end of a sleeve 26 pressed, which in turn at its other end to a tube 28 screwed into the line 12 is supported.

The outside air flowing in through the inlet valve 16 flows through the line 14 and is through a cutout 30 in the sleeve 26 through the hole 32 at the tip of the jet pump 24 escaping oxygen is sucked in. The incoming air mixes with the oxygen and flows with it it together through the sleeve 26 and the tube 28 to the mask, not shown.

Both the inner and the outer walls of the jet pump are designed conically in such a way that the wall thickness is essentially the same everywhere. The inner wall directs the oxygen without strong

· ■ -! * - ·: -: 'iv -; i 409 539/79

Vortex formation against the bore; from there the oxygen flows into the sleeve 26 and exerts a uniform Suction effect off. The pressure of oxygen increases upstream of the Jet pump 24, the bore 32 expands, whereby a larger amount of oxygen with greater Speed to increase the suction effect flows out of the bore. With a decrease the oxygen pressure decreases inversely as a result the resilience of the material, which preferably consists of a silicone rubber, the Cross-section of the bore, the outlet opening of which is approximately at the junction between the air and the oxygen line.

Claims (1)

Claim: Breathing gas supply device for high-altitude breathing apparatus with a lung-controlled oxygen supply valve, behind which a jet pump sucking in outside air is arranged, and one located at the inlet port for the outside air and controlled by the pressure of the outside air Valve that closes the opening cross-section when the pressure falls below a certain level throttling begins, characterized that the jet pump (24) consists of elastically flexible material and on its inflow side is provided with a one-piece annular flange (22) between a in the oxygen supply line (12) formed shoulder (20) and the end of one in the line removably arranged sleeve (26) is clamped. Considered publications:
German Patent No. 682 850;
U.S. Patent Nos. 2,595,737, 2,842,159. 1 sheet of drawings 409 539/79 3.64 © Bundesdruckerei Berlin