DE1224616B - Lung-controlled breathing gas supply valve - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

A62b

German class: 61 a - 29/05

Number: 1 224 616

File number: S 72546 V / 61 a

Filing date: February 15, 1961

Opening day: September 8, 1966

The invention relates to a lung-controlled breathing gas supply valve, whose valve closure body, actuated via a membrane and made of an inflexible material, has an elastically resilient one Material, e.g. B. rubber, existing sealing body is provided when the valve is closed is pressed against the valve seat and causes the seal of the valve.

In order for a valve of this type to be handy, its dimensions must be small, which in the first place has the consequence that the area of the membrane must be kept quite small. So that the strength that is required is to keep the inhalation valve closed, even with a small diaphragm can be created is a reduction when transmitting the diaphragm movement to the closure body is required, by which the force developed by the membrane is amplified to the required extent. To do it To ensure a perfect seal on the valve seat, it is essential that the diaphragm position, in which the membrane begins to act on the valve closure body in the opening direction, invariable remain. If this condition is not met, the operation of the valve would be impaired be that only part of the membrane movement is available for actuating the closure body.

The valve closure body, which consists of an inflexible material, is usually elastic with one of them compliant material, e.g. B. rubber, provided existing sealing body. When closed Valve, the sealing body is pressed against the valve seat and thereby seals the valve.

In known valves of this type, the axial position of the valve closure body is when the valve is closed Valve determined only by the flexible sealing body. As a result, it always changes in dependence the ambient pressure and the wear and tear on the sealing body. Therefore, with such Valves the entire movement of the membrane are not used continuously.

It is also known to manufacture the valve closure body entirely from a rigid material, as a result of which the position of the valve closure body is fixed when the valve is closed. This training of the However, the closure body requires extremely precise machining of the valve seat and the valve closure body, so that the valve really seals in the closed position.

The invention is based on the object of providing the lung-controlled valve described first in this way improve that the entire membrane movement is always used to open the valve closure body Lung-controlled breathing gas supply valve

Applicant:

AGA Aktiebolag, Lidingö (Sweden)

Representative:

Dipl.-Ing. W. Mouths, patent attorney,

Frankfurt / M., Krögerstr. 5

Named as inventor:

Oscar Emanuel Hedberg, Lidingö (Sweden)

Claimed priority:

Sweden May 13, 1960 (4741)

can be. This is achieved in that after the valve closing, sealing engagement of the Sealing body with the valve seat thereby a further movement of the valve closure body in the closing direction it is prevented that the part of the valve closure body made of rigid material comes into contact with parts of the valve seat that prevent further movement. At a Valve according to the invention is the position of the closure body in the axial direction when it is closed Valve precisely defined without a particularly precise machining of the valve seat and the valve closure body is required.

Further features of the invention are the subject of the dependent claim.

An exemplary embodiment is shown in the drawing. It shows

Fi g. 1 a lung-controlled breathing gas supply valve in longitudinal section and
F i g. 2 shows a detail on an enlarged scale.
The mouthpiece 1 of a breathing apparatus encloses the valve housing 2, at one end of which the breathing gas, for. B. air, is supplied through a designed as a valve seat 3 of the valve 4 pipe socket. The valve housing is actuated by the membrane 5 closing off the valve housing at the other end, the movement of which is transmitted by an angle lever 6 which is pivotably mounted on a pin 7. The exhalation valve 8 of the breathing apparatus is arranged on the membrane 5.

609 659/38

The valve closure body 12 of the valve 4 is loaded in the opening direction by the inflowing breathing gas and is also under the pressure of a spring 9 which essentially compensates for the pressure load caused by the breathing gas in the pipe socket. This pressure can be about 5 kgf / cm ² . The spring 9 surrounds a valve rod 10, the end of which, opposite the closure body, carries the pin 7, about which the angle lever 6 can be pivoted. The short lever arm is in contact with a fixed stop 11 so that the valve closure body 12 is lifted from the valve seat when the lever is pivoted counterclockwise under the action of the membrane 5. To increase the diaphragm force to the value required to open the valve 4, the distance between the pin 7 and the stop must

11 a fraction, e.g. B. one fifteenth of the distance between the pin 7 and the point of contact the membrane 5 with the angle lever 6.

As can be seen from Fig. 2, the sealing body is designed as a ring 13 with a round cross section, which is arranged in a groove 14 of the valve closure body 12. The sealing body consists of elastic compliant material, e.g. B. rubber. If no additional action would be taken this has the consequence that the position of the valve closure body 12 in the axial direction when the valve is closed Valve is not exactly fixed, but depends on the force with which the valve closure body is pressed onto the valve seat. In order to achieve a precisely defined position, the part is of the closure body, which consists of an inflexible material, is designed in such a way that it connects to the valve seat, which acts as a fixed stop, comes into engagement. This part of the valve closure body 12 is formed by an annular projection 15 which surrounds the round ring 13. The parts of the breech block are dimensioned so that when the valve is closed, the round ring with the valve seat is in Comes into engagement and produces the required seal, after which the projection 15 on the valve seat 3 comes to rest and the valve closure body

12 holds in a precisely defined position. This training has the consequence that the entire membrane movement available to operate the valve under all circumstances.

As can be seen particularly from Fig. 2, the valve closure body 12 is provided with a channel 16 which extends from the high pressure side of the valve to the inside of the ring 13, whereby the operation of the ring is ensured when the valve is closed. In addition, a plurality of channels 17 are arranged in the valve closure body 12 and extend from the low-pressure side of the valve to the upper side of the ring 13. These channels are intended to prevent the ring 13 from being pressed out of the groove 14 when the valve is opened.
An additional advantage, which is achieved by the precisely defined position of the valve closure body 12, is that the sealing pressure exerted by the spring 9 has a fixed value when the valve is closed. If the position of the valve closure body were determined by the resilient sealing body 13, an abnormal compression of the sealing body would result in an extension of the spring with a correspondingly reduced sealing pressure, which in some cases could result in the valve leaking. The precisely defined closed position of the valve closure body avoids this disadvantage, and the valve can be made easily operable by a suitable choice of the spring pressure.

Claims (2)

Patent claims: 1. Lung-controlled breathing gas supply valve, which is actuated via a diaphragm and is made of rigid Material of existing valve closure body with an elastically resilient one Material, e.g. B. rubber, existing sealing body is provided that when closed Valve is pressed against the valve seat and causes the seal of the valve, characterized in that that after the valve closing, sealing engagement of the sealing body with the valve seat (3) a further movement of the valve closure body (12) is prevented in the closing direction in that the from rigid material existing part of the valve closure body (12) to a further movement preventing parts of the valve seat comes to rest. 2. breathing gas supply valve according to claim 1, characterized in that the sealing body as ring (13) with a round cross-section is formed, which is in a groove (14) of the valve closure body (12) is arranged, the inside of which through a channel (16) with the high pressure side and the Outside through at least one further channel (17) with the low-pressure side of the valve connected is. Considered publications:
German patents No. 732 651, 841 849,
620;
U.S. Patent No. 2,766,752. 1 sheet of drawings 609 659/38 8.66 ® Bundesdruckerei Berlin