EP0808992A2 - Rotary slide valve for the control of steam flow to a steam turbine - Google Patents

Rotary slide valve for the control of steam flow to a steam turbine Download PDF

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Publication number
EP0808992A2
EP0808992A2 EP97108100A EP97108100A EP0808992A2 EP 0808992 A2 EP0808992 A2 EP 0808992A2 EP 97108100 A EP97108100 A EP 97108100A EP 97108100 A EP97108100 A EP 97108100A EP 0808992 A2 EP0808992 A2 EP 0808992A2
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EP
European Patent Office
Prior art keywords
rotating ring
ring
slide valve
steam
valve according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97108100A
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German (de)
French (fr)
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EP0808992B1 (en
EP0808992A3 (en
Inventor
Richard Geist
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Alstom SA
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ABB Patent GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/16—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes
    • F01D17/167—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of nozzle vanes of vanes moving in translation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F01D17/12—Final actuators arranged in stator parts
    • F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
    • F01D17/141—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path
    • F01D17/143—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits by means of shiftable members or valves obturating part of the flow path the shiftable member being a wall, or part thereof of a radial diffuser

Definitions

  • the invention relates to a radial rotary valve according to the preamble of claim 1.
  • Radial rotary valves are used to control the steam throughput in a steam turbine. With an immovable fixed ring and a rotating ring concentrically arranged on it, the angular position of which can be changed by a servo motor, it is possible to open or close the control slots provided in both rings more or less.
  • valves are almost exclusively used to control steam withdrawals, although rotary valves are relatively simple in comparison and also have some other advantages.
  • the sliding conditions are problematic, under which the rotating ring on the fixed ring has to be displaceable in each case.
  • the pressure ratios generated by static steam forces are of essential importance, since they are responsible for the friction between the parts sliding on each other. While axial rotary valves are fully affected by this problem, radial rotary valves result from this Static steam forces automatically counteract static relief of the external rotating ring.
  • the object of the invention is therefore to provide a radial rotary valve according to the preamble of claim 1, in which it is possible to optimize the width of the sliding gap and to avoid or at least significantly reduce the risk of clamping the system, which is extremely dangerous for turbine operation.
  • the fixed and rotating ring are basically divided in a radial rotary valve.
  • the upper part of the rotating ring and the lower part of the rotating ring are connected to one another in such a way that they are connected by suitable connecting means the distance from at least two opposite ends of these two ring halves is variable. This is a change in the rotating ring
  • a particularly advantageous development of the subject matter of the invention provides that the connecting means cooperate with at least one spring element which normally holds the two parts of the rotating ring tightly together, but which automatically increases the sliding play under the action of clamping forces.
  • a collar screw engages here, which is screwed into a threaded bushing of the rotating ring half. With its head, the collar screw engages a compression spring, which is supported on a collar of the other rotating ring half.
  • a linkage lever producing the connection to the servo motor ends at a linkage fork, to the fork tines of which an inward-pointing pin is attached and that these two pins are centered on Engage the parting joint in a hole, half of which is recessed in the top and bottom of the bezel.
  • control profiles determine the type of control slots, which in turn belong to the steam channel and are opened or closed according to the direction of rotation of the rotating ring. It is advantageous to give the control profiles an aerodynamic shape.
  • the profile heads are assigned to the fixed ring, while the profile ends lie in the fixed ring. The overall profile then comes into play when the control slot is fully open.
  • FIGS. 1 to 3 there is a radial rotary slide valve 1, 2 with its fixed ring 1 and its external rotary ring 2 arranged concentrically to it. Both the turbine housing 3 and the radial rotary slide valve 1, 2 are divided into upper and lower parts along a joint 16.
  • Control slots 17 which belong to the steam channel 5 and are fully open in the present representations, lie between the control profiles.
  • profile heads 4a and profile ends 4b lie positively on one another and, due to their aerodynamically optimized shape, form only a relatively low resistance for the steam flowing in the steam direction 7 from the steam duct front part 5a to the steam duct rear part 5b. From here, the steam then reaches the rotor blades of the turbine rotor 6.
  • the profile heads 4a can shift relative to the profile ends 4b to such an extent that the control slots 17 are completely closed. With a reduced cross section of the control slots 17, the shape of the control profiles 4 then no longer plays such a large role.
  • a servomotor (not shown), which acts on the rotary ring 2 via a link lever 10, is used for the rotationally movable adjustment of the rotary ring 2 relative to the fixed ring 1.
  • the articulation lever 10 there is an articulation fork 11 with fork tines 11a, 11b, in which inwardly pointing bolts 12 are fastened, which engage in the bores in the rotary ring 2 in the area of the parting joint 16.
  • a tensile force emanating from the servo motor would pull the lower ring part 2b away from the upper ring part 2a, while the conditions would be reversed with a compressive force.
  • the inner diameter of the rotating ring 2 or the gap lying in the parting line 16 would increase.
  • the internal diameter should only be increased if the sliding friction exceeds a predetermined limit value, in order then to reduce this value to an appropriate amount.
  • a correspondingly dimensioned compression spring 15 is provided, which is gripped by the head of a collar screw 14 and pressed against a collar 19 of the rotating ring part 2a. Since the collar screw 14 is screwed into a threaded bushing 13 of the lower ring part 2b, the upper ring part 2a and the lower ring part 2b are pressed by the compression spring 15 with their own spring force held together.

Abstract

The device has a fixed ring (1) and a rotary ring (2) concentric w.r.t. it whose angular position is varied by a servomotor. The rotary ring has a first control profile (4a) corresp. to a second profile (4b) on the fixed ring to form a control slot (17) between them which is variable to open or close the valve The rotary ring is divided into upper and lower parts which are joined so that separation of two opposing half-ring ends is variable to enable variation of the ring inner dia. to enable some play between the rotary and fixed rings required for rotation.

Description

Die Erfindung betrifft einen Radialdrehschieber nach dem Oberbegriff des Anspruchs 1. Radialdrehschieber dienen zur Steuerung des Dampfdurchsatzes bei einer Dampfturbine. Mit einem unbeweglichen Festring und einem konzentrisch auf diesem drehbeweglich angeordneten Drehring, dessen Winkelstellung durch einen Servomotor veränderbar ist, gelingt es, in beiden Ringen vorgesehene Steuerschlitze mehr oder weniger zu öffnen oder zu schließen.The invention relates to a radial rotary valve according to the preamble of claim 1. Radial rotary valves are used to control the steam throughput in a steam turbine. With an immovable fixed ring and a rotating ring concentrically arranged on it, the angular position of which can be changed by a servo motor, it is possible to open or close the control slots provided in both rings more or less.

Im Dampfturbinenbau verwendet man zur Steuerung von Dampfentnahmen fast ausschließlich Ventile, obwohl Drehschieber im Vergleich hierzu relativ einfach aufgebaut sind und auch noch einige andere Vorzüge aufweisen. Problematisch sind allerdings die Gleitbedingungen, unter denen jeweils der Drehring auf dem Festring drehbeweglich verschiebbar sein muß. Von wesentlicher Bedeutung sind hierbei die durch statische Dampfkräfte erzeugten Druckverhältnisse, da diese für die Reibung zwischen den aufeinander gleitenden Teilen verantwortlich sind. Während Axialdrehschieber von dieser Poblematik voll getroffen werden, ergibt sich bei Radialdrehschiebern durch das Gegeneinanderwirken der statischen Dampfkräfte automatisch eine statische Entlastung des außen liegenden Drehrings.In steam turbine construction, valves are almost exclusively used to control steam withdrawals, although rotary valves are relatively simple in comparison and also have some other advantages. However, the sliding conditions are problematic, under which the rotating ring on the fixed ring has to be displaceable in each case. The pressure ratios generated by static steam forces are of essential importance, since they are responsible for the friction between the parts sliding on each other. While axial rotary valves are fully affected by this problem, radial rotary valves result from this Static steam forces automatically counteract static relief of the external rotating ring.

Aus der DE 42 14 775 A1 ist ein Axialdrehschieber bekannt, bei dem mit Hilfe von Axialnadeldrehkränzen die Gleitreibung des Drehrings weitgehend durch eine Rollenreibung abgelöst ist. Eine entsprechende Rollenlagerung ist selbstverständlich auch bei Radialdrehschiebern möglich, aber nur dann akzeptabel, wenn der hierbei entstehende Gleitspalt so klein ist, daß die dadurch bedingten Dampfverluste gering bleiben. Ein sehr schmaler Gleitspalt ist aber nicht nur wegen geringer Fertigungstoleranzen schwer zu beherrschen, sondern kann auch unter normalen Betriebsbedingungen zu Problemen führen. Drehschieber unterliegen beim Einsatz Temperatureinwirkungen von einigen hundert Grad. Durch uneinheitliche Wärmedehnungen beim Drehring einerseits und Festring andererseits können große, jede Bewegung verhindernde Hemmkräfte entstehen, weil die vorgesehenen Spiele verschwinden und dadurch regelrechte

Figure imgb0001
Klemmverbindungen" erzeugt werden.From DE 42 14 775 A1 an axial rotary valve is known in which the sliding friction of the rotating ring is largely replaced by a roller friction with the help of axial needle slewing rings. A corresponding roller bearing is of course also possible with radial rotary valves, but only acceptable if the resulting sliding gap is so small that the resulting steam losses remain low. A very narrow sliding gap is not only difficult to control due to low manufacturing tolerances, but can also lead to problems under normal operating conditions. Rotary vane are subject to temperature influences of several hundred degrees during use. Inconsistent thermal expansions on the rotating ring on the one hand and the fixed ring on the other hand can result in large inhibiting forces that prevent any movement, because the intended play disappears and as a result real
Figure imgb0001
Clamp connections "are generated.

Aufgabe der Erfindung ist es deshalb, einen Radialdrehschieber nach dem Oberbegriff des Anspruchs 1 zu schaffen, bei dem es gelingt die Breite des Gleitspaltes zu optimieren und das Risiko einer für den Turbinenbetrieb äußerst gefährlichen Klemmung des Systems zu vermeiden oder zumindest deutlich zu vermindern.The object of the invention is therefore to provide a radial rotary valve according to the preamble of claim 1, in which it is possible to optimize the width of the sliding gap and to avoid or at least significantly reduce the risk of clamping the system, which is extremely dangerous for turbine operation.

Diese Aufgabe wird durch die im Anspruch 1 gekennzeichneten Merkmale gelöst. Zweckmäßige Ausgestaltungen und Weiterbildungen des Erfindungsgegenstandes sind in den Unteransprüchen genannt.This object is achieved by the features characterized in claim 1. Appropriate refinements and developments of the subject matter of the invention are mentioned in the subclaims.

So wie das Turbinengehäuse durch eine Teilfuge in ein Ober- und ein Unterteil gespalten ist, sind auch Fest- und Drehring bei einem Radialdrehschieber grundsätzlich geteilt. Im Unterschied zu herkömmlichen Konstruktionen ist es jedoch ein wesentlicher Vorteil der erfindungsgemäßen Lösung, daß Drehringoberteil und Drehringunterteil nicht starr, sondern durch geeignete Verbindungsmittel so miteinander verbunden sind, daß der Abstand von mindestens zwei sich gegenüberstehenden Enden dieser beiden Ringhälften veränderbar ist. Dadurch ist eine Veränderung des Drehring-Just as the turbine housing is split into an upper and a lower part by a parting joint, the fixed and rotating ring are basically divided in a radial rotary valve. In contrast to conventional constructions, however, it is a major advantage of the solution according to the invention that the upper part of the rotating ring and the lower part of the rotating ring are connected to one another in such a way that they are connected by suitable connecting means the distance from at least two opposite ends of these two ring halves is variable. This is a change in the rotating ring

Innendurchmessers ermöglicht, und es kann das für Drehbewegungen erforderliche Gleitspiel zwischen Drehring und Festring angepaßt werden.Allows inner diameter, and it can be adapted to the sliding movement required for rotary movements between the rotating ring and the fixed ring.

Eine besonders vorteilhafte Weiterbildung des Erfindungsgegenstandes sieht vor, daß die Verbindungsmittel mit mindestens einem Federelement zusammenwirken, das die beiden Teile des Drehrings im Normalfall fest zusammenhält, aber unter der Einwirkung von Klemmkräften automatisch eine Vergrößerung des Gleitspiels ermöglicht.A particularly advantageous development of the subject matter of the invention provides that the connecting means cooperate with at least one spring element which normally holds the two parts of the rotating ring tightly together, but which automatically increases the sliding play under the action of clamping forces.

Der bei einer Verwendung von Federelementen naheliegende Einsatz von je einem Federelement an den beiden Enden der miteinander zu verbindenden Ringhälften, kann dadurch noch vereinfacht werden, daß zwei sich gegenüberstehende Enden der beiden Drehringhälften, durch ein Scharnier zusammengehalten werden, so daß nur ein Federelement benötigt wird.The obvious use of spring elements using a spring element at the two ends of the ring halves to be connected can be simplified by holding two opposite ends of the two rotating ring halves together by a hinge, so that only one spring element is required .

Für den Einsatz des Federelementes an den beiden sich gegenüberstehende Enden der beiden Drehringhälften, die nicht durch ein Scharnier verbunden sind, ist vorgesehen, daß hier eine Bundschraube angreift, die in eine Gewindebuchse der einen Drehringhälfte eingeschraubt ist. Mit ihrem Kopf erfaßt die Bundschraube eine Druckfeder, die sich auf einem Kragen der anderen Drehringhälfte abstützt. Sobald Klemmkräfte auftreten, die größer sind als die von der Druckfeder ausgehende, die beiden Ringhälften verbindende Federkraft, vergrößert sich an dieser Stelle die Teilfuge zwischen den beiden Ringhälften und die Gleitreibung vermindert sich.For the use of the spring element at the two opposite ends of the two rotating ring halves, which are not connected by a hinge, it is provided that a collar screw engages here, which is screwed into a threaded bushing of the rotating ring half. With its head, the collar screw engages a compression spring, which is supported on a collar of the other rotating ring half. As soon as clamping forces occur that are greater than the spring force originating from the compression spring and connecting the two ring halves, the parting joint between the two ring halves increases at this point and the sliding friction is reduced.

Eine noch sicherere Öffnung der Teilfuge bei zu hoher Gleitreibung wird dann erreicht, wenn die Stellkräfte des den Drehring betätigenden Servomotors unmittelbar an der Teilfuge angreifen. Hierzu ist vorgesehen, daß ein die Verbindung zum Servomotor herstellender Anlenkhebel an einer Anlenkgabel endet, an deren Gabelzinken je ein nach innen weisender Bolzen befestigt ist und daß diese beiden Bolzen mittig zur Teilfuge in eine Bohrung eingreifen, die je zur Hälfte im Drehringoberteil und Drehringunterteil ausgespart ist.An even more secure opening of the parting joint if the sliding friction is too high is achieved when the actuating forces of the servo motor actuating the rotating ring act directly on the parting joint. For this purpose, it is provided that a linkage lever producing the connection to the servo motor ends at a linkage fork, to the fork tines of which an inward-pointing pin is attached and that these two pins are centered on Engage the parting joint in a hole, half of which is recessed in the top and bottom of the bezel.

Die Steuerprofile bestimmen die Art der Steuerschlitze, die ihrerseits zum Dampfkanal gehören und entsprechend der Stellrichtung des Drehrings geöffnet oder geschlossen werden. Es ist vorteilhaft den Steuerprofilen eine aerodynamische Form zu geben. Hierbei werden dem Festring die Profilköpfe zugeordnet, während die Profilenden im Festring liegen. Das Gesamtprofil kommt dann bei voller Steuerschlitzöffnung zur Geltung.The control profiles determine the type of control slots, which in turn belong to the steam channel and are opened or closed according to the direction of rotation of the rotating ring. It is advantageous to give the control profiles an aerodynamic shape. Here, the profile heads are assigned to the fixed ring, while the profile ends lie in the fixed ring. The overall profile then comes into play when the control slot is fully open.

Obwohl das automatische Vergrößern des Gleitspiels sehr vorteilhaft ist, könnte man alternativ auch Verbindungsmittel vorsehen, die mit entsprechenden Werkzeugen, vorzugsweise durch Betätigung von Schraubelementen, einstellbar sind. Hierdurch wäre es möglich in jedem Einzelfall das benötigte Gleitspiel zu optimieren.Although the automatic increase in the sliding play is very advantageous, one could alternatively also provide connecting means which can be adjusted using appropriate tools, preferably by actuating screw elements. This would make it possible to optimize the required sliding play in each individual case.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Es zeigen:

Fig. 1
einen radialen Schnitt durch ein Dampfturbinengehäuse im Bereich des Drehschiebers, mit Ober- und Unterteil und Verbindungsmitteln,
Fig. 2
ein vergrößertes Detail X des Radialdrehschiebers mit Verbindungsmitteln und Betätigungsmitteln des Servomotors,
Fig. 3
einen Schnitt durch die Betätigungsmittel nach Fig. 2 entlang der Schnittlinie AA im Bereich der Teilfuge.
Embodiments of the invention are shown in the drawings and are described in more detail below. Show it:
Fig. 1
a radial section through a steam turbine housing in the area of the rotary valve, with upper and lower part and connecting means,
Fig. 2
an enlarged detail X of the radial rotary valve with connecting means and actuating means of the servo motor,
Fig. 3
a section through the actuating means of FIG. 2 along the section line AA in the region of the parting line.

Das Verständnis der zu beschreibenden Anordnung wird erleichtert, wenn man die sich ergänzenden Details aller Fig. 1 bis 3 gemeinsam in die Betrachtung mit einbezieht. Innerhalb eines Turbinengehäuses 3 befindet sich ein Radialdrehschieber 1, 2 mit seinem Festring 1 und seinem konzentrisch dazu angeordneten, außenliegenden Drehring 2. Sowohl das Turbinengehäuse 3, als auch der Radialdrehschieber 1,2 sind entlang einerTeilfuge 16 in Ober- und Unterteile geteilt.Understanding the arrangement to be described is made easier if one considers the complementary details of all of FIGS. 1 to 3 together. Within a turbine housing 3 there is a radial rotary slide valve 1, 2 with its fixed ring 1 and its external rotary ring 2 arranged concentrically to it. Both the turbine housing 3 and the radial rotary slide valve 1, 2 are divided into upper and lower parts along a joint 16.

Die Dampfsteuerung erfolgt mit Steuerprofilen 4, deren Profilköpfe 4a dem Drehring 2 und deren Profilenden 4b dem Festring 1 zugeordnet sind. Zwischen den Steuerprofilen liegen Steuerschlitze 17, die zum Dampfkanal 5 gehören und in den vorliegenden Darstellungen voll geöffnet sind. Bei dieser Winkelstellung des Drehrings 2 zum Festring 1 liegen Profilköpfe 4a und Profilenden 4b formschlüssig aufeinander und bilden durch ihre aerodynamisch optimierte Form nur einen relativ geringen Widerstand für den in Dampfrichtung 7 vom Dampfkanal-Vorderteil 5a zum Dampfkanal-Hinterteil 5b durchströmenden Dampf. Von hier aus gelangt der Dampf dann zu den Laufschaufeln des Turbinenrotors 6. Durch Drehen des Drehrings 2 können sich die Profilköpfe 4a gegenüber den Profilenden 4b soweit verschieben, daß die Steuerschlitze 17 völlig geschlossen werden. Bei vermindertem Querschnitt der Steuerschlitze 17 spielt die Form der Steuerprofile 4 dann keine so große Rolle mehr.The steam is controlled using control profiles 4, the profile heads 4a of which are assigned to the rotating ring 2 and the profile ends 4b of which are assigned to the fixed ring 1. Control slots 17, which belong to the steam channel 5 and are fully open in the present representations, lie between the control profiles. In this angular position of the rotating ring 2 relative to the fixed ring 1, profile heads 4a and profile ends 4b lie positively on one another and, due to their aerodynamically optimized shape, form only a relatively low resistance for the steam flowing in the steam direction 7 from the steam duct front part 5a to the steam duct rear part 5b. From here, the steam then reaches the rotor blades of the turbine rotor 6. By turning the rotating ring 2, the profile heads 4a can shift relative to the profile ends 4b to such an extent that the control slots 17 are completely closed. With a reduced cross section of the control slots 17, the shape of the control profiles 4 then no longer plays such a large role.

Zum drehbeweglichen Verstellen des Drehrings 2 gegenüber dem Festring 1 dient ein nicht dargestellter Servomotor, der über einen Anlenkhebel 10 am Drehring 2 angreift. Hierzu befindet sich am Ende des Anlenkhebels 10 eine Anlenkgabel 11 mit Gabelzinken 11a, 11b, in denen nach innen weisende Bolzen 12 befestigt sind, die im Bereich der Teilfuge 16 in entsprechende Bohrungen im Drehring 2 eingreifen. Bei der in soweit beschriebenen Anordnung würde eine vom Servomotor ausgehende Zugkraft den Drehringunterteil 2b vom Drehringoberteil 2a wegziehen während sich bei einer Druckkraft die Verhältnisse umkehren würden. In beiden Fällen würde sich aber der Innendurchmesser des Drehrings 2 bzw. der in der Teilfuge 16 liegende Spalt vergrößern.A servomotor (not shown), which acts on the rotary ring 2 via a link lever 10, is used for the rotationally movable adjustment of the rotary ring 2 relative to the fixed ring 1. For this purpose, at the end of the articulation lever 10 there is an articulation fork 11 with fork tines 11a, 11b, in which inwardly pointing bolts 12 are fastened, which engage in the bores in the rotary ring 2 in the area of the parting joint 16. In the arrangement described so far, a tensile force emanating from the servo motor would pull the lower ring part 2b away from the upper ring part 2a, while the conditions would be reversed with a compressive force. In both cases, however, the inner diameter of the rotating ring 2 or the gap lying in the parting line 16 would increase.

Eine Vergrößerung des Innendurchmessers soll jedoch nur dann stattfinden, wenn die Gleitreibung einen vorgegebenen Grenzwert überschreitet, um dann diesen Wert auf einen angemessenen Betrag zu vermindern. Hierzu ist eine entsprechend dimensionierte Druckfeder 15 vorgesehen, die vom Kopf einer Bundschraube 14 erfaßt und gegen einen Kragen 19 des Drehringoberteils 2a gepreßt wird. Da die Bundschraube 14 in eine Gewindebuchse 13 des Drehringunterteils 2b eingeschraubt ist, werden Drehringoberteil 2a und Drehringunterteil 2b von der Druckfeder 15 mit der ihr eigenen Federkraft zusammengehalten. Nur wenn zwischen Drehring 2 und Festring 1 eine Friktion auftritt, die diese Federkraft überschreitet, vergrößert sich bei Betätigung des Anlenkhebels 10 der Spalt im Bereich der Teilfuge 16 soweit, daß die Gleitreibung sinkt und eine Drehbewegung möglich wird.However, the internal diameter should only be increased if the sliding friction exceeds a predetermined limit value, in order then to reduce this value to an appropriate amount. For this purpose, a correspondingly dimensioned compression spring 15 is provided, which is gripped by the head of a collar screw 14 and pressed against a collar 19 of the rotating ring part 2a. Since the collar screw 14 is screwed into a threaded bushing 13 of the lower ring part 2b, the upper ring part 2a and the lower ring part 2b are pressed by the compression spring 15 with their own spring force held together. Only when a friction occurs between the rotating ring 2 and the fixed ring 1 that exceeds this spring force, does the gap in the region of the parting joint 16 increase when the link lever 10 is actuated to such an extent that the sliding friction drops and a rotary movement becomes possible.

BezugszeichenlisteReference list

  • Festring (1)Fixed ring (1)
  • Drehring (2)Rotating ring (2)
  • Drehringoberteil (2a)Upper part of the rotating ring (2a)
  • Drehringunterteil (2b)Rotating ring lower part (2b)
  • Turbinengehäuse (3)Turbine housing (3)
  • Steuerprofile (4)Control Profiles (4)
  • Profilköpfe (4a)Profile heads (4a)
  • Profilenden (4b)Profile ends (4b)
  • Dampfkanal (5)Steam channel (5)
  • Dampfkanal-Vorderteil (5a)Steam duct front part (5a)
  • Dampfkanal-Hinterteil (5b)Steam duct rear part (5b)
  • Laufschaufeln des Turbinenrotors (6)Turbine rotor blades (6)
  • Dampfrichtung (7)Steam Direction (7)
  • Scharnier (8)Hinge (8)
  • Scharnierwelle (9)Hinge shaft (9)
  • Anlenkhebel (10)Link lever (10)
  • Anlenkgabel (11)Link fork (11)
  • Gabelzinken (11a, 11b)Forks (11a, 11b)
  • Bolzen (12)Bolt (12)
  • Gewindebuchse (13)Threaded bushing (13)
  • Bundschraube (14)Collar screw (14)
  • Klemmfeder (15)Clamp spring (15)
  • Teilfuge (16)Parting line (16)
  • Steuerschlitze (17)Control slots (17)
  • Gleitspalt (18)Sliding gap (18)
  • Kragen (19)Collar (19)

Claims (7)

Radialdrehschieber zur Steuerung des Dampfdurchsatzes bei einer Dampfturbine, mit einem unbeweglichen Festring (1) und einem konzentrisch auf diesem drehbeweglich angeordneten Drehring (2), dessen Winkelstellung durch einen Servomotor veränderbar ist und der erste Steuerprofile (4a) besitzt, die mit entsprechenden zweiten Steuerprofilen (4b) des Festrings (1) so korrespondieren, daß zwischen den Steuerprofilen (4) liegende Steuerschlitze (17) im Sinne eines Öffnens oder Schließens veränderbar sind, wobei der Drehring (2) im Bereich der Teilfuge (16) in ein Drehringoberteil (2a) und ein Drehringunterteil (2b) geteilt ist, dadurch gekennzeichnet, daß Drehringoberteil (2a) und Drehringunterteil (2b) durch geeignete Verbindungsmittel (8, 9; 11 bis 15) so miteinander verbunden sind, daß der Abstand von mindestens zwei sich gegenüberstehenden Halbringenden veränderbar ist, und dadurch eine Veränderung des Drehring-Innendurchmessers ermöglicht, um das für Drehbewegungen erforderliche Gleitspiel zwischen Drehring (2) und Festring (1) anzupassen.Radial rotary slide valve for controlling the steam throughput in a steam turbine, with an immovable fixed ring (1) and a rotating ring (2) concentrically arranged on it, the angular position of which can be changed by a servo motor and which has first control profiles (4a), which, with corresponding second control profiles ( 4b) of the fixed ring (1) correspond in such a way that control slots (17) located between the control profiles (4) can be changed in the sense of opening or closing, the rotating ring (2) in the region of the parting joint (16) into a rotating ring part (2a) and a rotating ring lower part (2b) is divided, characterized in that the rotating ring upper part (2a) and rotating ring lower part (2b) are connected to one another by suitable connecting means (8, 9; 11 to 15) such that the distance from at least two opposing half ring ends can be changed , and thereby allows a change in the inner diameter of the rotating ring to make it necessary for rotary movements Adjust sliding play between the rotating ring (2) and the fixed ring (1). Radialdrehschieber nach Anspruch 1, dadurch gekennzeichnet, daß die Verbindungsmittel mit mindestens einem Federelement (15) zusammenwirken, das die beiden Teile des Drehrings (2) im Normalfall fest zusammenhält aber unter der Einwirkung von Klemmkräften automatisch eine Vergrößerung des Gleitspiels ermöglicht.Radial rotary valve according to claim 1, characterized in that the connecting means cooperate with at least one spring element (15) which normally holds the two parts of the rotary ring (2) tightly together but automatically increases the sliding play under the action of clamping forces. Radialdrehschieber nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Verbindungsmittel (8, 9; 11 bis 15) ein Scharnier (8) besitzen, das zwei sich gegenüberstehende Enden der beiden Drehringhälften (2a, 2b) zusammenhält.Radial rotary valve according to one of the preceding claims, characterized in that the connecting means (8, 9; 11 to 15) have a hinge (8) which holds together two opposite ends of the two rotating ring halves (2a, 2b). Radialdrehschieber nach Anspruch 3, dadurch gekennzeichnet, daß an den beiden anderen sich gegenüberstehende Enden der beiden Drehringhälften (2a, 2b), die nicht durch das Scharnier (8) verbunden sind, eine Bundschraube (14) angreift, die in eine Gewindebuchse (13) der einen Drehringhälfte (2b) eingeschraubt ist und mit ihrem Kopf eine Druckfeder (15) erfaßt, die sich auf einem Kragen der anderen Drehringhälfte (2a) abstützt.Radial rotary slide valve according to claim 3, characterized in that a collar screw (14) engages at the two other opposite ends of the two rotating ring halves (2a, 2b), which are not connected by the hinge (8), which screws into a threaded bushing (13) one of the rotating ring halves (2b) is screwed in and engages with its head a compression spring (15) which is supported on a collar of the other rotating ring half (2a). Radialdrehschieber nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß ein die Verbindung zum Servomotor herstellender Anlenkhebel (10) an einer Anlenkgabel (11) endet, an deren Gabelzinken (11a, 11b) je ein nach innen weisender Bolzen (12) befestigt ist und daß diese beiden Bolzen (12) mittig zur Teilfuge (16) in eine Bohrung eingreifen, die je zur Hälfte im Drehringoberteil (2a) und Drehringunterteil (2b) ausgespart ist.Radial rotary slide valve according to one of the preceding claims, characterized in that a linkage lever (10) producing the connection to the servo motor ends at a linkage fork (11), to the fork prongs (11a, 11b) of which an inwardly pointing pin (12) is attached and that these two bolts (12) engage in the center of the parting line (16) in a hole, half of which is recessed in the upper part of the rotating ring (2a) and the lower part (2b). Radialdrehschieber nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Steuerprofile (4) aus dem Drehring (2) zugeordneten Profilköpfen (4a) und dem Festring (1) zugeordneten Profilenden (4b) bestehen und diese durch ihre Stellung zueinander die zu einem Dampfkanal (5) gehörigen Steuerschlitze (17) öffnen oder schließen.Radial rotary slide valve according to one of the preceding claims, characterized in that the control profiles (4) consist of profile heads (4a) assigned to the rotating ring (2) and profile ends (4b) assigned to the fixed ring (1) and their position relative to one another leads to a steam channel ( 5) Open or close the associated control slots (17). Radialdrehschieber nach Anspruch 1, dadurch gekennzeichnet, daß die Verbindungsmittel (8, 9; 11 bis 15) mit entsprechenden Werkzeugen, vorzugsweise durch Betätigung von Schraubelementen, einstellbar sind.Radial rotary slide valve according to Claim 1, characterized in that the connecting means (8, 9; 11 to 15) can be adjusted using appropriate tools, preferably by actuating screw elements.
EP97108100A 1996-05-24 1997-05-20 Rotary slide valve for the control of steam flow to a steam turbine Expired - Lifetime EP0808992B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19620949A DE19620949A1 (en) 1996-05-24 1996-05-24 Radial rotary valve to control the steam throughput in a steam turbine
DE19620949 1996-05-24

Publications (3)

Publication Number Publication Date
EP0808992A2 true EP0808992A2 (en) 1997-11-26
EP0808992A3 EP0808992A3 (en) 1999-07-07
EP0808992B1 EP0808992B1 (en) 2003-03-26

Family

ID=7795214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97108100A Expired - Lifetime EP0808992B1 (en) 1996-05-24 1997-05-20 Rotary slide valve for the control of steam flow to a steam turbine

Country Status (4)

Country Link
US (1) US5799927A (en)
EP (1) EP0808992B1 (en)
JP (1) JPH1082470A (en)
DE (2) DE19620949A1 (en)

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US7097421B2 (en) * 2004-10-08 2006-08-29 United Technologies Corporation Vernier duct blocker
ES2388747T3 (en) 2007-07-10 2012-10-18 Siemens Aktiengesellschaft Rotary distributor for steam flow control in a steam turbine
IT1401665B1 (en) * 2010-08-31 2013-08-02 Nuova Pignone S R L DRIVING SYSTEM FOR TURBOMACHINE AND METHOD.
US9803557B2 (en) * 2015-01-20 2017-10-31 United Technologies Corporation Gas turbine engine and blocker door assembly
US10030544B2 (en) 2015-10-06 2018-07-24 Nuovo Pignone S.R.L. Extracting steam from a turbine

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US10161302B2 (en) * 2013-05-14 2018-12-25 Imperial Innovations Limited Variable flow-restricting turbine assembly for a turbocharger, corresponding turbocharger engine and vehicle, and operating method

Also Published As

Publication number Publication date
DE19620949A1 (en) 1997-11-27
US5799927A (en) 1998-09-01
EP0808992B1 (en) 2003-03-26
EP0808992A3 (en) 1999-07-07
DE59709597D1 (en) 2003-04-30
JPH1082470A (en) 1998-03-31

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