DE1008977B - Pressure reducing device with lockable variable or unchangeable throttle point for high pressure steam and supercritical pressure conditions and with a downstream intermediate pressure tank - Google Patents

Description

GERMAN

The subject matter of the invention relates to a pressure reducing device with lockable variable or unchangeable throttle point for high pressure steam and supercritical pressure conditions, with an intermediate pressure vessel behind this throttle point is provided with all-round outlet openings for the steam.

Such a device contains the pre-pressure chamber, the throttle point and the downstream pressure chamber. To the In order to cope with high pressure gradients, it is expedient to divide the throttle point into a movable one and a fixed part with a gap between the two. The invention relates on the design of the fixed throttle point.

It is already known to have an annular nozzle with an inside behind the lockable throttle point To use the direction of flow of the steam lying guide surface and here the required extensive Bring pressure reduction. This will probably be achieved, but at supersonic speed on Steam escaping from the nozzle with the associated noise.

The aim of the invention is to carry out the pressure reduction in stages and thereby the occurrence of supersonic speed and the associated noise.

This goal is achieved in such a way that the exit openings running all around in the wall of the intermediate pressure vessel are designed in the manner of the single-edge labyrinth seals, with the openings as narrow, towards the outlet in cross-section a flat thread cross-section The same course having gaps are formed in which a change of direction and loss of tension is achievable for the steam.

The number of parallel outlet openings in the wall of the intermediate pressure vessel is arbitrary and depends on the amount of steam passing through, while number and dimensions the labyrinthine expansion chambers forming the ends of the outlet openings due to the pressure gradient to be overcome and the state of steam that occurs during the flow can be determined. The individual parts of the Device are among themselves and with the housing of the pressure reducing device by the intermediate pressure vessel internal or external threaded bolts connected in a known manner so that the mutual Location as well as the slot width is maintained. Interchangeable ones serve the latter purpose Intermediate layers.

The interlocking shoulders and grooves can be arranged concentrically. Then the steam flows only in the radial direction, from the pressure reducing device

with lockable changeable

or constant throttle point

for high pressure steam and supercritical

Pressure ratios and with a downstream intermediate pressure tank

Applicant:

Ewald Schlegel,

Dresden A 34, Kohlgraben 40

Ewald Schlegel, Dresden,
has been named as the inventor

seen from cross-currents, which are caused by the increasing enlargement of the ring diameter will. But you can also arrange the approaches and millings so that it is for the expanding Steam long, serpentine paths with frequent kinks. (Meander shape)

The subject matter of the invention is described and illustrated by way of example with reference to the drawings. Fig. 1 shows a cross section through the device.

Fig. 2 shows a part of the device of Fig. 1 on an enlarged scale in section and

Fig. 3 is a section along the line on Fig. 2. The steam passes from the upstream pressure chamber 1 with the valve open cone 2 in the space inside the Zwisehendruckbehälters 2 a (Fig. 1 and 2). The circular outlet openings 4, 4 a (Fig. 2) are essential for the pressure reduction. The steam emerges through this in a radial direction. The steam emerging through the gap-like outlet opening 4 is deflected several times at right angles in its direction. He pushes thereby under constant pressure loss of the rings running lugs 5, 6, 7, 8, 9 of the upper part respectively of the ring 11. In like manner, the through the outlet opening 4, α steam emerging through the rings running lugs 12, 13 14, 15, 16 of the ring 11 or the bottom part deflected several times at right angles with considerable pressure loss. It is up to you to control a large pressure gradient through the number of projections 5 to 9 or 12 to 16 that follow one another in the radial direction. Depending on the amount of

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escaping steam, it is necessary to provide one or more steam outlet openings 4. In the case of a single steam outlet opening 4, the bottom part 17 is directly opposite the top part 10. If several steam outlet openings 4 or 4 α are provided, the interposition of rings 11 is necessary.

Both the rings 11 and the upper part 10 and ßode part 17 are provided with eyes 20 through which Connecting bolts are passed through with the interposition of spacers so that the Gap width of the outlet openings 4 or 4 a can be precisely regulated. The eyes 20 are on different ones Place the circumference inside or outside of the intermediate pressure vessel.

Depending on the particular operating conditions, it may be necessary to use several devices in accordance with of the invention to be connected in series. It is also possible to first release the steam through a pressure reducing valve of the known type mentioned at the outset, and then by a previously described one Let device pass through.

Claims (6)

PATENT CLAIMS: 1. Pressure reducing device with lockable, changeable or immutable Throttle point for high pressure steam and supercritical pressure ratios, behind this Throttle point still an intermediate pressure vessel with outlets running all around for the Steam is provided, characterized in that the outlet openings (4) running all around in the wall of the intermediate pressure vessel (2a) are designed in the manner of the known labyrinth seals, the openings as narrow, towards the outlet, the cross-section has a course identical to the flat thread cross-section Gaps are formed in which a change of direction and loss of tension for the steam can be achieved is. 2. Device according to claim 1, characterized in that that in the intermediate container (2 a) one or more all-round outlet openings (4, 4 a) with subsequent labyrinth shape are provided. 3. Device according to claims 1 and 2, characterized in that the intermediate pressure vessel consists of an annular top part (10) and a bottom part (17) and the outlet openings by facing each other, held at a distance from each other Ring surfaces are formed, with annular surfaces extending concentrically to one another on the ring surfaces Lugs (5, 7, 9, 13, 15) are arranged which interlock in the assembled state while maintaining a low mutual distance and distance from the opposite ring surface. 4. Apparatus according to claim 3, characterized in that to maintain the distance between the top and bottom part in the interior of the intermediate pressure vessel both on the top part (10) and on the bottom part (17) eyes (20) are provided through the connecting bolts with spacer washers in between. and can be screwed in. 5. Apparatus according to claim 4, characterized in that when several outlet openings are arranged (4, 4 a) each between the top and bottom part (10 or 17) rings (11) interposed are, the approaches running concentrically to one another on their two annular surfaces (6, 8 or 12, 14, 16), which between the approaches (5, 7, 9 and 13, 15) of the upper and Bottom parts in the assembled state at a distance from the formation of the labyrinth-like column intervention. 6. Device according to claims 4 and 5, characterized in that optionally several Rings (11) are provided one above the other, their mutual position together with the position the top and bottom parts (10, 17) through the connecting bolts with spacer washers in between is secured. Considered publications:
German Patent Nos. 830 142, 470 353;
U.S. Patent No. 2,489,623;
Catalog 107 b from Sohaeffer & Budenberg from 1939. 1 sheet of drawings © 709 510/236 5.57