DE1075912B - Device for reducing pressure in gaseous media with a multi-stage throttle body - Google Patents

Description

kl. 47 g 21/03

INTERNAT. KL. F 06 fc

PATENT OFFICE

S 43994 XII / 47g

REGISTRATION DATE: MAY 18, 1955

NOTICE THE REGISTRATION AND ISSUE OF THE EXPRESSION: FEBRUARY 18, 1960

The invention relates to a pressure reducing device for gaseous media, in particular from Steam. The invention is based on the object of creating a device which is used for conversion causes large amounts of gaseous agents, especially high pressure steam at such low pressure, without strong vibration phenomena occurring, which are associated with noises and could possibly cause vibration fractures.

A stage nozzle has already become known which is used as a control device for automatic condensate drainage and automatic venting has been used. The invention also makes of a multi-stage arrangement and also uses a multi-stage throttle body, its Throttle zones increase in the direction of flow, with a stress relief area on each throttle zone follows. Such a multi-stage throttle body is located behind a shut-off part.

In addition to this known arrangement, however, the invention now consists in the fact that the corresponding to the Flow rate of the gaseous medium adjustable throttle body immediately before a throttle stage, Appropriately in front of the first, slots for water injection are built in. The cooling water can either be injected from the throttle body or from the housing through appropriate nozzles.

It is in itself a steam conversion valve for superheated steam cooling with atomization of the through holes supplied water has become known within the valve and with a throttle channel behind the valve seat. In this case, however, the throttle channel is connected to one that is connected to the water supply Surrounding the annular channel, and the bores extending from it open between the valve seat and the Throttle channel. This is not a multi-stage throttle arrangement. Furthermore there is also a Another device for superheated steam cooling became known, with the injection of water through the hollow Spindle of the throttle body is supplied. Here, too, there is only a single throttle point.

In contrast to these known arrangements, in which a water injection in general the throttle gap is made between the valve seat and the throttle 4-5 channel, the invention is based on the knowledge that it is important for the pressure reducing device to work economically The presence of a multi-stage throttle body at a very specific point controls the water injection to undertake. Only when according to the invention the water inlet openings on the corresponding to the amount of gaseous means adjustable throttle body immediately before a throttle stage, expediently before the Device for pressure reduction

gaseous agent
with a multi-stage throttle body

Applicant:

Siemens-Schuckertwerke

Corporation,

Berlin and Erlangen,

Erlangen, Werner-von-Siemens-Str. 50

Ludwig Haenisch, Erlangen,
has been named as the inventor

first, are placed, the task described at the beginning can be fulfilled in a satisfactory manner.

For a further understanding of the invention should be in detail on the basis of an exemplary embodiment, the structure and the mode of operation of such a multi-stage reduction device explained for superheated steam.

In Fig. 1, the multi-stage reduction housing is denoted by 1. A closure 2 with a high pressure stuffing box 3 closes the high pressure part of the housing from the outside. The spindle 4 is both in the high pressure part and stored on the exit side. It is driven by the electric variable speed drive 5 and thus moves the throttle body 6, which the ring lugs 7, 8, 9 and 10. The outer edges of the ring approaches 7j 8, 9 and 10, which because of the high steam speed with wear-resistant Are provided with hard armor, together with the inner wall 22 of the housing, form the throttle points 11, 12, 13 and 14, which form a larger or smaller cross-section depending on the position of the throttle body 6. The after the constrictions in the throttle body following the ring lugs form together with the inner wall of the housing 22 the corresponding relaxation spaces 15, 16, 17 and 18. The bearing 19 of the throttle body the outlet side is supported by support ribs 20 in the downstream outlet connection 21. It exists also the possibility of designing the throttle body as a smooth truncated cone and with appropriate extensions the housing wall to form the relaxation rooms.

909 730/264

Claims (3)

In Fig. 2, in which the throttle body is shown in the minimum control position, the supply line for the cooling water is designated by 24. The cooling water is directed to the first throttle stage through the bore 25 of the spindle of the throttle body. An annular channel 26 (Fig. 3), which is connected to an annular slot 27, forwards the cooling water into this and from there it reaches the throttle point 11. The water is entrained, finely distributed and the steam by the steam flowing past at high flow speed chilled. The fact that the steam flows through from one pressure stage to the other when passing the throttle points several times at very high speeds ensures that the injection water will pass completely into the steam. The temperature pulse of the reduced steam can therefore be taken immediately after the reducing device. The steam, which enters the high-pressure part of the steam throttle through the nozzle 23 at a certain pressure, arrives at the throttle point 11. In this throttle point, the flow velocity is increased by the cross-section reduction according to the law of continuity, so that the static pressure is reduced, but as a result the dynamic pressure increases. In the following first expansion space, the corresponding reversal of these fluidic phenomena takes place, but with the difference that due to the increase in volume in the expansion space, the dynamic pressure of the medium is lower than it was before the throttle point. These processes are repeated analogously in the subsequent throttle and expansion points, so that at the end the desired pressure reduction is achieved, with the possibility of adjusting the throttle points in a wide range. This mode of operation is known in multi-stage throttle bodies. As FIG. 4 shows, the shut-off valve 29 is controlled in a conventional manner by a pressure regulator 32 which responds to the pressure pulses of the counter-pressure line 34 and either opens or closes the shut-off valve 29. The throttle body moves accordingly in the control position. In parallel with this, the injection control valve 31 opens in the usual way via the temperature controller 30, as a result of which the superheated steam is brought to the counterpressure steam temperature. The drives of the shut-off valve and the regulating drive of the pressure reducing device are electrically coupled to one another. The use of multi-stage throttle bodies in pressure regulators has already been proposed per se. The subdivision of the function of a converter valve into two separate organs makes it possible to automatically arrange appropriate passage cross-sections in the individual throttle stages for each amount of steam to be reduced. This results in completely constant conditions in the individual flow cross-sections at each opening point, which have an extremely favorable effect on the faultless, low-noise function of the device, whereby a maximum of operational safety is achieved. The flow cross-sections assigned to the individual stages can be determined precisely by calculation, so that all the prerequisites necessary for perfect operability can be created during the structural development of a steam reducing device. The multi-stage pressure reducing device is also particularly suitable as an expansion valve for starting modern high-pressure boilers with high capacities. In this case, a so-called relaxation drum of the start-up decompressor is no longer necessary, since the entire relaxation in the pressure reducing device takes place at the desired counterpressure. A certain temperature of the relaxed steam can also be set. Patent to ρ rüg ίΐΕ: 1. Device for reducing the pressure of gaseous media, especially steam, with a rear a shut-off part arranged multi-stage throttle body, the throttle zones increase in the flow direction, with a throttle zone a relaxation room follows, characterized in that according to the amount of gaseous means of adjustable throttle body immediately before a throttle stage, expedient in front of the first, slots for water injection are built in. 2. Device according to claim 1, characterized in that the injection water in itself in a known manner supplied from the outside through a spindle bore inside the throttle body will. 3. Device according to claims 1 and 2, characterized in that the injection water is injected in particular via an annular slot in the throttle body and the supply line (24) from the outside through a hollow-drilled support rib (20) of the lower bearing holder provided for the spindle (19) is performed. Considered publications:
German Pateritschrift 'No. 869076;
Leaflet H 749 »Information No. 1«
»Gestra guide for the steam practitioner«;
British Patent No. 710 069. Legacy Patents Considered:
German Patent No. 1 039 332. 1 sheet of drawings 903 730/264 2.60