Control valve f�r Beatmungsger�te.

[0001] The invention concerns a valve in the generic term of the requirement 1 kind specified and in particular a respirator to the artificial respiration and/or support of the natural artificial respiration of a patient, a proportionally with an air entrance, a source of air, and at least adjustable control valve, as well as sensors for the measurement of the pressure and the flow for the control of the control valve, whereby the control valve exhibits a housing and a rotary valve arranged rotably therein around its longitudinal axis and the housing is provided also by rotating the rotary valve totally or partly lockable depressing openings. Respirators become both in the stationary (e.g. Klinikoder home range) and within the mobile range (e.g. Emergency service) assigned. It is very important that these devices work reliably and troublefree. In order to avoid disturbances of the environment when the operation such devices, these devices must be also as quiet as possible in the enterprise. From US 6,615,831 a respirator with 3/2-Weg-Ventil is well-known. The valve exhibits a valve spool axially adjustable by means of a solenoid coil, which opens depressing openings for artificially respirating air coming from a printing generator in its end positions and/or locks these and opens at the same time separate depressing openings, in order to make a minimum air consumption possible for the printing generator. This valve is however very strongly positiondependent, and due to the radial clearance necessary for the axial mobility of the valve spool in the closed condition also leaky. The EP 1,177,810 B1 shows a valve with around its longitudinal axis rotable rotary valve. This exhibits one lengthwise slot, which can be set with appropriate openings of the Gehäuseteils surrounding the slidegate valve to the coincide at its extent at least. In addition at the free face of the rotary valve a cam is attached, by whatever the openings can be only partly opened. This valve exhibits likewise the disadvantage that it is never completely close in closed condition. In order to ensure the dynamics of the valve, the rotary valve with a certain radial clearance in the Gehäuseteil must be fit in. By the annular gap developing thereby a part of the breathing air can escape and affect thus the desired dosage negatively. The invention is the basis from there the task, a respirator, and/or a valve for a respirator to create, which is reliable in service, a small flow resistance exhibits, in high dynamics is characterised and in closed condition high tightness of the valve made possible. In accordance with the invention this is reached by the fact that exhibits at least one sealing element an admission for the lamellas of the iris screen. The iris screen is used so far mainly within the range Fotound video cameras for the dosage of the exposure. An important goal of the invention consists also of obtaining within the valve as laminar a current as possible. The lamellas of the iris screen are mobile from there against a central arranged displacement body. With opened valve the displacement body is flowed around generally and educates thereby in the current as it were a “float”. In order to make possible a close locking of the valve by about radially the lamellas accumulating to it, the displacement body can consist of a flexible material. It is however appropriate that the displacement body exhibits at least a flexible sealing element. The control valve is proportionally headed for favourably over a stepping motor. Thus there are not only two positions of the valve, i.e. “openly” or “too”, in the enterprise of the valve but arbitrary intermediate positions can be headed for depending upon need. For an automatic resetting into its initial position the rotary valve is rotable against the resetting force at least one torsion bar appropriately. In the dead condition of the rotary drive thus a defined initial position exists. The valve according to invention is preferably used in equipment for the artificial respiration or for the support of the natural artificial respiration. Further training of the invention are indicated in the figures and in the dependent patent claims. The reference symbol list is a component of revealing. The figures are spreading described coherently and. Same reference symbols mean same construction units, reference symbols with different indices indicate function-same or similar construction units. On the basis of figures the invention is described symbolically and exemplarily more near. Thereby Fig show. 1 a respirator according to invention, schematically represented, Fig. 2 Fig. 3 Fig. 4 an execution form, of the valve according to invention in Stirnansicht, a cut by the valve in accordance with Fig, trained according to kind of an iris screen. 2 along the cut line B-B, and a perspective opinion in Fig. 2 and 3 represented valve. In Fig. 1 schematically represented, respirator provided to the protection with a boarding 10 exhibits an air entrance 1 and a source of air 2. Source of air 2 is preferably designed as blowers or compressor. In addition, as source of air 2 an internal or external accumulator or an external compressed air feed circuit can be used. In the upper, the inhalation of a patient of serving strand an adjustable inhalation control valve 3a, a flow sensor 4a for the inhalation and a pressure sensor 5a for the inhalation is arranged. At the end of this strand an inhalation hose 6 leads to the patient. A breathing out hose 7 leads from the patient back into the boarding 10. in this lower, breathing out steering strand is likewise a pressure sensor 5b for breathing out, a flow sensor 4b for breathing out and an adjustable breathing out control valve 3b arranged. The measured values Durchflussund pressure sensors are supplied constantly to a control 8, where them for the regulation of the control valves 3a, 3b for the inhalation and/or breathing out the patient to serve. Finally the breathed out breathing air arrives over an air outlet 9 in the free. From the Fig. in as flange trained housing 20 exhibits 2 to 4 evident execution form of the control valve. In the housing 20 an operating ring 21 is rotably stored. A central arranged displacement body 22 is connected by radial bars 23 with the housing 20. The displacement body 22 consists of a front part 22a and a back part 22b, which is for example bolted with one another. At the housing 20 lamellas are tiltable fastened, which admitted iris screen by rotating the operating ring 21 according to the principle of one from the optics radially inward be swivelled can. The displacement body 22 forms thereby the radial attack of the lamellas 25. In order to achieve and a damage of the lamellas 25 prevent a good sealing, the displacement body 22 is provided in the accumulating range of the lamellas 25 with one or more sealing elements 24. These sealing elements 24 can be designed for example as O-rings. This control valve trained according to kind of an iris screen results in 26 very favorable flow conditions from the symmetrical arrangement of the depressing opening. Reference symbol list 1 air entrance 2 source of air 3a inhalation control valve 3b breathing out control valve 4a flow sensor for artificial respiration 4b flow sensor for breathing out 5a pressure sensor for artificial respiration 5b pressure sensor for breathing out 6 inhalation hose 7 breathing out hose 8 control 9 air outlet boarding housing 21 operating ring of 22 displacement bodies 22a front part 22b back part 23 bar 24 sealing element lamella 26 depressing opening