EP2975223A1 - Adjustable nozzle ring, method of manufacturing and steam turbine - Google Patents

Abstract

The present invention relates to a nozzle ring apparatus (100) for a steam turbine (300). The nozzle ring device (100) has a carrier ring (101), a first blade (103) and a second blade (104). The carrier ring (101) extends along a circumferential direction (102), the first blade (103) is arranged on the carrier ring (101) and extends from the carrier ring (101) along a radial direction (312) and the second blade (104). is also disposed on the carrier ring (101) and also extends from the carrier ring (101) along the radial direction (312). The second blade (104) is spaced from the first blade (103) such that a flow channel (105) is provided between the first blade (103) and the second blade (104). At least the first blade (103) has a first basic body (106) and a first adjusting element (17), wherein the first adjusting element (107) is adjustably arranged relative to the first basic body (106) such that a blade spacing (108) between the first adjusting element (107) and the second blade (104) is variable. Furthermore, the present invention relates to a method for manufacturing a nozzle ring device described above.

Description

Technical area

The present invention relates to an adjustable nozzle ring device for a steam turbine. Furthermore, the present invention relates to a method for producing a nozzle ring device for a steam turbine.

Background of the invention

Steam turbines, such as turbines for conventional steam power plants, turbines for combined gas-fired power plants or turbines for nuclear power plants, are heat engines with rotating running parts and static guide parts. Due to the flow of the working fluid impinging on the blades of the rotating mover, the energy of the working fluid is converted into mechanical work.

Here, a so-called nozzle ring is arranged in steam turbines before the first rotating stage, whose task is to regulate the steam mass flow, which meets the first rotating stage. This is achieved by dividing the blades of the nozzle ring into nozzle groups. Each nozzle group is regulated via respective external valves. If a different amount of live steam is required, one or more nozzle groups can be switched on or off.

The control valves are housed in so-called valve housings or valve boxes above or next to the turbine housing. The control valves are connected to the inflow of the nozzle ring via welded pipes and elbows.

The power control thus takes place in today's steam turbines via external valves. This nozzle groups can be switched on and switched off. Thus, the amount of working fluid, the just requested, turbine power is adjusted.

For above-described arrangement of the valves, sufficient space must be provided. Furthermore, the cast housings of the valves, pipes and flanges must often be made of high quality material.

Due to the numerous flow diversions within the piping and the valve housings, energy losses occur, which can be reflected in a reduced efficiency.

Fig. 5 shows a schematic representation of a conventional nozzle ring device according to the prior art. In this case, a conventional nozzle ring device is also arranged in a housing 450. However, the conventional nozzle ring apparatus is divided into a first nozzle ring portion 504, a second nozzle ring portion 514, a third nozzle ring portion 524, and a fourth nozzle ring portion 534. Each of the four nozzle ring sections 504, 514, 524 and 534 is connected to common piping via piping 503, 513, 523 and 533 and respective control valves 502, 512, 522 and 532, respectively.

Presentation of the invention

It is an object of the present invention to provide an efficient control for a nozzle ring device.

The object is achieved by a nozzle ring device for a steam turbine, a steam turbine, which has a nozzle ring device, and by a method for producing a nozzle ring device according to the independent claims.

According to a first aspect of the present invention, there is provided a nozzle ring apparatus for a steam turbine. The nozzle ring device has a carrier ring, a first blade and a second blade. The carrier ring extends along a circumferential direction. The first vane is disposed on the carrier ring and extends from the carrier ring along a radial direction. The second blade is disposed on the support ring and extends from the support ring in the radial direction. The second vane is spaced from the first vane along the circumferential direction such that a flow channel, also referred to as a nozzle channel, is provided between the first vane and the second vane. At least the first blade has a first base body and a first adjusting element. The first adjusting element is adjustably arranged relative to the first base body such that a blade distance between the first adjusting element and the second blade is variable.

The circumferential direction is that direction which runs around the axis of rotation of the steam turbine. The axis of rotation runs along an axial direction. The carrier ring is an annular ring element, which serves as a carrier structure of the blades.

As the radial direction that direction is considered, which extends at right angles starting from the axis of rotation of the steam turbine radially outward. The first blade and the second blade extend radially outwardly or inwardly from the carrier ring. The support ring may thus be a radially inner support ring, from which the blades protrude radially outward or be an outboard support ring, from which the blades project radially inwardly.

The flow channel is the distance between two adjacently arranged blades. The flow channel is also referred to as a nozzle. Through the flow channel flows Working fluid in the first runner, which is arranged along the axis of rotation downstream relative to the nozzle ring device.

As a base body, the portion of a blade is referred to, which is rigidly connected to the carrier ring. It can be rigidly connected to each other that blade and carrier ring are integrally formed, but also that blade and carrier ring, for example, positively or non-positively connected to each other, so that at the transition point between the base body and the carrier ring no relative movement of the element body relative to the element Carrier ring is possible.

As adjustment of the portion of the blade is understood, which is adjustable relative to the base body and thus also relative to the support ring. The adjusting element is designed such that the adjusting element extends along the entire radial extent of the flow channel. For example, the adjustment member may have a radially extending flow edge which extends along the entire radial length of a region (e.g., the first portion described below) of the first blade, which region forms the flow channel.

The clearance between the first adjusting element (or the above-described radially extending flow edge) and the second blade is regarded as the blade spacing. By adjusting the first adjusting element, the blade spacing between the adjusting element and the second blade and thus the flow cross section of the flow channel is changed. The blade spacing thus defines a constriction, in particular the smallest flow cross-section, of the flow channel between the first blade and the second blade.

In contrast to the conventional approach explained in the introduction, in which external valves have individual nozzle groups switched on and off, in the approach according to the present invention, each individual flow channel of the nozzle ring device, ie each individual nozzle between two adjacent blades, can be adjusted by means of the adjusting element. Accordingly, it is possible to dispense with external valves which require a large installation space. Thus, an efficient control of a nozzle ring device can be provided, since, for example, installation space can be reduced. In addition, weight and corresponding material costs can be saved by reducing the components, such as the external valves, pipes and flanges.

In addition, directly at the nozzle between two adjacent blades, the flow cross-section of the nozzle or the flow channel is controlled, so that less flow deflection within the conventional piping between the nozzle groups and the conventional valves lying are necessary. This also increases the efficiency of the concept according to the present invention.

The inventive nozzle ring device also allow adjustment of the blade spacing with little force, since not the entire blade is adjusted, but only a smaller area, namely the corresponding adjustment. Adjusting the blade clearance by adjusting the entire blades requires high adjustment forces because the blade surface provides a large area of attack for working fluid forces on the blade. If, as in the present invention, only a portion of the blade, in this case the adjusting element, adjusted, the forces to be overcome are lower.

According to a further exemplary embodiment, the first adjusting element is adjustable between a retracted state and an extended state. In the retracted state is a maximum blade clearance between the first adjustment (or its flow edge) and the second shovel in front. In the extended state, there is a minimum blade clearance between the first adjustment element and the second blade. For example, in the extended state, the first adjustment element (eg by means of the flow edge) touch the second blade, so that the flow cross-section of the flow channel is closed and accordingly little or no steam can flow between the first blade and the second blade.

According to yet another exemplary embodiment, the first adjusting element is designed such that in the retracted state between the first adjusting element and the first base body, a common homogeneous flow area is formed.

A flow surface, which consists of two adjoining individual surfaces, is then to be regarded as a "common homogeneous flow surface" if the normals of the two individual surfaces are parallel at their surfaces at the transition between the two individual surfaces. In the present invention, this means that the normal on the surface of the base body and the normal on the surface of the adjusting element in the transition region are parallel to each other. In other words, there are no step-like transitions on the flow surface.

The retracted state is the state in which a common homogeneous flow surface between the base body and adjustment is given.

The extended state corresponds to a state in which the transition between the adjusting element and the base body has a jump or step in the course of the flow area surrounded by working fluid.

The maximum blade clearance is described as the space between two adjoining blades when the flow channel has a maximum width and thus also a maximum amount of working fluid can be moved between two adjacent blades.

The minimum blade clearance is described as the clearance between two adjacent blades when the flow channel has a minimum width and thus a minimum amount of working fluid can be moved between two adjacent blades.

The term "adjustable between a retracted state and an extended state" means that the retracted state corresponds, for example, to the state 0 and the extended state corresponds to a state 1. However, a continuous movement of the control element can also set all intermediate states, which correspond to arbitrary values between 0 and 1. This has the consequence that different flow cross-sections of the flow channel are adjustable, so that any number of different amounts of working fluid through the flow channels is adjustable.

According to a further exemplary embodiment, the first adjusting element is retractable and extendable on the first base body arranged such that the blade clearance between the first adjusting element and the second blade is variable.

As a retractable or extendable adjusting element, an element is described, which is arranged on the base body, that it forms in its retracted state together with the base body, the common homogeneous flow area. To adjust the blade spacing, the adjusting element is defined, for example, as a translationally displaceable wall element of the basic body.

According to yet another exemplary embodiment, the first adjusting element forms an axis of rotation about which the first adjusting element on the first base body in such a way is rotatably arranged, that the blade clearance between the first adjusting element and the second blade is variable.

As an axis of rotation, for example, an axis is described which extends parallel to the longitudinal extent of the blade or parallel to the radial direction.

The first adjusting element, which is e.g. is rotatable, may be formed bolt-like. Also, the first adjustment member may be pivotally arranged in the form of a flow flap (e.g., a flap or slat) on a forward flow side of the first blade or on a downstream flow side (edge) of the first blade.

An element is described as rotatable if it is rotatable about its axis of rotation and thus its relative position in space can be changed.

According to a further exemplary embodiment, the first base body has a receiving groove. The first adjusting element is arranged in the receiving groove and arranged rotatably about the axis of rotation such that the first adjusting element in the direction of the second blade is rotatable in or out of the receiving groove.

As a receiving groove a recess in the body is described, which allows the adjustment to be performed in it and occupy a defined position relative to the body. The receiving groove is formed such that the adjusting element is in the retracted state in the receiving groove and, for. forms a homogeneous flow area as explained above.

According to yet another embodiment of the present invention, the nozzle ring device comprises an adjusting device. The first adjusting element has a first portion, which is arranged in the receiving groove. The first adjusting element has a second portion which protrudes at least partially in the radial direction from the receiving groove. The second section forms a free end section. The first adjusting element has at the free end portion to an adjusting lever which is coupled to the first adjusting element on the one hand and the adjusting on the other hand such that with the adjusting device by means of displacement of the adjusting lever, a rotation of the first adjusting element is controllable.

The first section describes a portion of the first adjusting element, which extends in the radial direction along the receiving groove and, together with the basic body in the retracted state, forms the common homogeneous flow area of the first blade. The first section has, for example, the flow edge, with which the flow cross-section of the flow channel is adjustable.

As a second portion, a further portion of the first adjusting element is described, which extends in the radial direction of the first portion through the support ring and is coupled to the support ring. The first portion and the second portion are arranged one behind the other in the radial direction.

The free end portion is located at the radially outer or inner end of the second portion viewed from the axis of rotation of the steam turbine.

As an adjusting lever, an element is described, which is so firmly connected between the second portion and the adjusting device outside the flow channel, that the adjusting lever transforms a movement of the adjusting device, for example, in a rotational movement of the adjusting element. The adjusting lever thus transmits a control force from the adjusting device to the adjusting element. The adjusting device is arranged outside the flow channel and coupled to the adjusting lever. The adjusting device has a hydraulic, pneumatic or electric drive. The adjusting device can be controlled by means of a control unit, so that the adjusting lever and consequently the flow cross-section of the flow channel can be adjusted in a targeted manner.

According to yet another exemplary embodiment of the present invention, the second blade has a further second adjustment element. The further second adjusting element is adjustably arranged relative to the second base body, that a further blade spacing between the second adjusting element and a third blade, which is arranged spaced from the second blade along the circumferential direction, is variable.

The second base body and the second adjusting element may have the same features and configurations of the first base body described above and the first adjusting element of the first blade. In this case, the second base body may be identical to the first base body and the second adjusting element identical to the first adjusting element, so that there are two identical blades arranged at a distance from each other. However, both the second basic body and the second adjusting element may each be designed differently from the first basic body or first adjusting element, so that two differently shaped blades are arranged at a distance from one another on the carrier ring. The uniform arrangement of identically shaped blades over the circumferential direction of the carrier ring has the advantage that the flow of the working fluid flowing through the nozzle device is uniformly applied and influenced.

As a further blade spacing, a distance between the second blade and the third blade is described, which may also be analogous to the blade clearance between the first blade and the second blade. The third blade may accordingly have a third adjusting element. According to a further exemplary embodiment of the present invention, the second blade has a further second adjustment element. The further second adjusting element is adjustably arranged relative to the second base body such that the blade spacing between the further second adjusting element of the second blade and the first adjusting element is variable.

As a further second adjusting element of the second blade, an element is described, which is arranged on the second blade such that it is located on the blade side, which faces the first blade, and thus on the opposite blade side of the second adjusting element. By this arrangement, it is possible that the blade clearance between the first blade and the second blade is even further reduced, with the use of two relatively adjustable adjusting elements less force must be applied, since the adjustment are each dimensioned smaller than the entire blade and thus less force is exerted by the working fluid on each adjustment.

The adjusting device can be coupled, for example, with corresponding second or third adjusting levers. The adjusting device is designed, for example, such that the first adjusting element of the first blade, the second adjusting element of the second blade or a plurality of further adjusting elements of further blades, which are arranged along the circumferential direction of the carrier ring, are individually adjustable. Also, the adjustment can be designed such that all adjusting elements are adjusted the same. Thus, over the entire circumferential direction of the nozzle ring device, a specific flow profile of working fluid or steam can be adjusted through the respective flow channels between the corresponding blades. Thus, an efficient and accurate control the flow through the nozzle ring device can be achieved with working fluid.

According to another aspect of the present invention, there is provided a steam turbine having a nozzle ring apparatus and a blade system as described above. The nozzle ring device is located upstream of the blade ring.

A blade system may be formed of blades and vanes which are alternately arranged in a flow direction and convert the energy of the working fluid into work. Also, a blade system may consist of only one row of blades, or any number of blade rows and rows of blades. A working fluid first flows through a nozzle ring device, which may be designed like one of the embodiments described above, and subsequently the blade system.

In accordance with another aspect of the present invention, a method of manufacturing a nozzle ring apparatus for a steam turbine is described. According to the method, a support ring is provided which extends along a circumferential direction. A first blade is provided which is disposed on the carrier ring so that the first blade extends from the carrier ring along a radial direction. A second blade is provided, which is arranged on the carrier ring, so that the second blade extends from the carrier ring in the radial direction. The second vane is spaced from the first vane along the circumferential direction so that a flow channel is provided between the first vane and the second vane. At least the first blade has a first base body and a first adjusting element. The first adjusting element is arranged so adjustable relative to the first base body, that a blade distance is variable between the first adjusting element and the second blade.

In accordance with another exemplary embodiment of the present invention, a bore is drilled in the carrier ring in the method. The first adjusting element is arranged in the carrier ring. The first blade and the second blade are eroded out after arranging the first adjustment element, so that the flow channel is formed between the first blade and the second blade and the first adjustment element forms a homogeneous flow surface with the first base body.

According to the above-described production of the nozzle ring device, the carrier ring may first be provided as a base body. Subsequently, radial bores are formed in this base body. As an opening hole in the support ring is described, which may be formed as a so-called through hole or as a so-called blind hole in the support ring. In a through hole, the bore extends from a radially outer surface of the carrier ring to a radially inner surface completely through the carrier ring. In a blind bore, the bore, which has an opening at the radially outer surface, terminates within the material of the carrier ring.

Subsequently, the (at this time, for example, still cylindrical) pivot pin, which will later form the adjustment used. Subsequently, the flow channels and the corresponding blades (ie the corresponding base body and adjusting elements) are eroded out of the carrier ring as a base body. The pivot pins, which are used in the holes, also eroded into the final shape. With a lever mechanism outside the flow region, the adjusting elements are aufdrehbar and zudrehbar, so that a desired steam mass flow is adjustable. So the steam flow is on the optimal Accelerated speed and supplied to the subsequent blade.

In summary, it should be noted that by means of the present invention, with the above-described adjustable nozzle ring device, which before, i. upstream, a control wheel or a first row of the steam turbine is arranged, the effort for the steam control simplifies and so the steam turbine can be made more compact and cheaper. Conventional nozzle group valves, up to four in today's turbines, can be reduced to a single main regulator in the present invention. The adjustable nozzle ring device installed in an inflow spiral can adapt the outlet area of its nozzles to the respective steam flow from the main control valve by means of the respective adjusting elements of the individual vanes. According to the invention, not the entire nozzle vane is adjusted, but only the adjusting element, which represents only a part of the respective vane. This design is easier to manufacture and more robust because the adjustment and accordingly the adjustment need to absorb less forces. Thus, the embodiment of the invention can also be used at higher steam parameters.

A steam turbine, which has, inter alia, a nozzle ring device according to one of the embodiments described above by way of example, additionally has inter alia an assembly (which is here seen as part of the steam turbine) of a valve block welded to the lower housing part. The valve block has a quick-closing valve for stopping the supply of the working fluid in an emergency, and a main regulating valve connected downstream of the quick-acting valve, which controls the amount of working fluid impinging on the nozzle ring device. The external (located outside the turbine housing) main control valve can regulate the total amount of steam flowing (working fluid) (or tax) and is like the quick-closing valve with a quick closing device for safe interception of the steam turbine equipped. The nozzle ring device is installed in the steam turbine in a Einströmspirale or an inner housing and therefore does not need to be completely sealed.

According to a further exemplary embodiment of the present invention, after opening the quick-acting valve to the valve seat of the main control valve, the live steam pressure builds up. By the easy opening of the valve working fluid flows to the nozzle ring device. After starting up and synchronizing the steam turbine with the main control valve, the main control valve for load pick-up is further opened (opened) and after locking the nozzle ring device in the closed position, which corresponds to an adjustment of all adjusting the nozzle ring device in the extended state, the main control valve is fully opened. From this point on, the adjusting device of the nozzle ring device takes over the further control (or control) of the steam turbine power.

It should be noted that the embodiments described herein represent only a limited selection of possible embodiments of the invention. Thus, it is possible to suitably combine the features of individual embodiments with one another, so that for the person skilled in the art with the variants of embodiment that are explicit here, a multiplicity of different embodiments are to be regarded as obviously disclosed.

Brief description of the drawings

• Fig. 1 zeigt einen Ausschnitt einer Düsenringvorrichtung gemäß einer beispielhaften Ausführungsform der vorliegenden Erfindung;
• Fig. 2A zeigt eine schematische Darstellung eines Ausschnitts einer Düsenringvorrichtung im eingefahrenen Zustand gemäß einer beispielhaften Ausführungsform der vorliegenden Erfindung;
• Fig. 2B zeigt eine schematische Darstellung eines Ausschnitts einer Düsenringvorrichtung im halb ausgefahrenen Zustand gemäß einer beispielhaften Ausführungsform der vorliegenden Erfindung;
• Fig. 2C zeigt eine schematische Darstellung eines Ausschnitts einer Düsenringvorrichtung im ausgefahrenen Zustand gemäß einer beispielhaften Ausführungsform der vorliegenden Erfindung;
• Fig. 3 zeigt eine Dampfturbine mit Düsenringvorrichtung gemäß einer beispielhaften Ausführungsform der vorliegenden Erfindung;
• Fig. 4 zeigt ein Schaltschema einer Düsenringvorrichtung gemäß einer beispielhaften Ausführungsform der vorliegenden Erfindung; und
• Fig. 5 zeigt ein Schaltschema einer Düsenringvorrichtung gemäß dem Stand der Technik.

In the following, for further explanation and for a better understanding of the present invention, embodiments will be described in detail with reference to the accompanying figures.

• Fig. 1 shows a section of a nozzle ring device according to an exemplary embodiment of the present invention;
• Fig. 2A shows a schematic representation of a section of a nozzle ring device in the retracted state according to an exemplary embodiment of the present invention;
• Fig. 2B shows a schematic representation of a section of a nozzle ring device in the half-extended state according to an exemplary embodiment of the present invention;
• Fig. 2C shows a schematic representation of a section of a nozzle ring device in the extended state according to an exemplary embodiment of the present invention;
• Fig. 3 shows a steam turbine with nozzle ring device according to an exemplary embodiment of the present invention;
• Fig. 4 FIG. 12 is a schematic diagram of a nozzle ring apparatus according to an exemplary embodiment of the present invention; FIG. and
• Fig. 5 shows a circuit diagram of a nozzle ring device according to the prior art.

Detailed description of exemplary embodiments

The same or similar components are provided in the figures with the same reference numerals. The illustrations in the figures are schematic and not to scale.

Fig. 1 shows a nozzle ring device 100 for a steam turbine 300 (see Fig. 3 ). The nozzle ring device 100 has a carrier ring 101, a first blade 103 and a second blade 104. The carrier ring 101 extends along a circumferential direction 102. The first blade 103 is arranged on the carrier ring 101 and extends from the carrier ring 101 along a radial direction 312. The second blade 104 is arranged on the carrier ring 101 and extends from the carrier ring 101 in FIG the radial direction 312. The second vane 104 is spaced from the first vane 103 along the circumferential direction 102 so that a flow passage 105 between the first vane 103 and the second vane 104 can be provided. At least the first blade 103 has a first basic body 106 and a first adjusting element 107. The first adjusting element 107 is adjustably arranged relative to the first base body 106 such that a blade spacing 108 between the first adjusting element 107 and the second blade 104 is variable.

For better clarity, see Fig. 1 only the first blade 103 with the first adjusting element 107, which is arranged rotatably about its axis of rotation 122, and the first base body 106 shown. Furthermore, the second blade 104 is shown with a second adjusting element 117, which is arranged rotatably about its axis of rotation 122 ', and a second base body 116. In the circumferential direction 102, a multiplicity of first blades 103 and / or second blades 104 can accordingly be arranged on the carrier ring 101.

Like also in Fig. 1 shown, the first adjustment 107 consist of a first portion 110, which along a receiving groove 210 (see Fig. 2 ) in the radial direction 312 (see Fig. 3 ) and a second portion 120 which is disposed in the carrier ring 101.

The circumferential direction 102 is in Fig. 1 shown as running clockwise. In other words, along the circumferential direction 102, first the first blade 103 and then the second blade 104 are arranged.

The flow channel 105 is the distance between two adjacent blades arranged. The flow channel 105 is also referred to as a nozzle. Through the flow passage 105, the working fluid flows into the first run row, which is arranged downstream of the rotation axis relative to the nozzle ring device 100.

The main body 106, 116 is the portion of the first blade 103 and the second blade 104, which protrudes in the radial direction from the receiving groove 210. In this case, the blade 103, 104 and support ring 101 are positively or non-positively connected to each other, so that at the transition point between the base body 106, 116 and support ring 101, no relative movement is possible.

The adjusting element 107 or 117 is relative to the base body 106 and 116 and thus also relative to the support ring 101 adjustable. The adjusting element 107 or 117 has a radially extending flow edge (contour of blade 103 or 104), which runs along the entire radial length of the flow channel 105.

The blade clearance 108 is the clear distance between the first adjustment element 107 and the second blade 104. By adjusting the first adjustment element 107, the blade clearance 108 between the adjustment element 107 and the second blade 104 and thus the flow cross section of the flow channel 105 is changed.

The first adjusting element 107, which is rotatable, is formed bolt-like. In this case, the adjusting element 107 or 117 rotatable about its axis of rotation 122 and 122 'rotatable and thus can change its relative position in space.

The receiving groove 210 is formed as a recess in the base body 106. The adjusting element 107 is guided in it and assumes a defined position relative to the base body 106 a. The receiving groove 210 is formed such that the adjusting element 107 is in the illustrated partially extended state to a large extent in the receiving groove 210 and projects with a portion of the adjusting element 107 in the flow channel 105.

The first section 110 is the portion of the second adjusting element 117, which extends in the radial direction along the receiving groove 210 and forms a flow area of the second blade 104 together with the base body 116 in the illustrated partially extended state. The first section has, for example, the flow edge, with which the flow cross-section of the flow channel 105 is adjustable.

The second portion 120 is the further portion of the second adjusting element 117, which extends in the radial direction 312 from the first portion 110 through the support ring 101 and is coupled to the support ring 101. The first section 110 and the second section 120 are arranged one behind the other in the radial direction 312.

Fig. 2A to Fig. 2C show exemplary operating states of the first adjusting element 107 and the second adjusting element 117 of the nozzle device 100 Fig. 1 ,

Fig. 2A shows a schematic representation of a section of the nozzle ring device 100, in which the adjusting elements 107, 117 are shown in the retracted state.

Fig. 2B shows a schematic representation of a section of the nozzle ring device 100, in which the adjusting elements 107, 117 are shown in the half-extended state.

Fig. 2C shows a schematic representation of a section of the nozzle ring device 100, in which the adjusting elements 107, 117 are shown in the extended state.

In Fig. 2A to Fig. 2C the circumferential direction 102 is shown extending in the figure from bottom to top.

In Fig. 2A to Fig. 2C Each of the first vane 103, the second vane 104 and a portion of the third vane 214 are shown. In the representation of the retracted state (see Fig. 2A ) is a homogeneous flow surface 203, which is formed from adjusting element 106 and 116 and the base body 107 and 117, recognizable. Between the first adjusting element 107 of the first blade 103 and the second blade 104, a maximum blade clearance 211, which defines the retracted state of the adjusting element, can be seen. Also, a further blade clearance 208 between the second blade 104 and the third blade 214 can be seen.

In Fig. 2B is in the half-extended state well the transition between retracted state and extended state recognizable and the resulting continuous adjustment of the blade clearance. In addition, the receiving groove 210 is clearly visible.

In Fig. 2C FIG. 2 illustrates the extended state where the blade clearance 108 is a minimum blade clearance 212. The adjusting element 107, 117 is rotatably arranged in a bore 213.

Fig. 3 shows a steam turbine, in which the nozzle ring device 100 from Fig. 1 upstream of a blade system 310. An adjusting device 303 of the nozzle ring device 100 has a free end portion 302 and an adjusting lever 301. The flow direction of the working fluid is in Fig. 3 running from left to right Are defined. Radial direction 312 extends outwardly from the axis of rotation of the steam turbine.

The free end portion 302 is located on the viewed from the axis of rotation of the steam turbine 300 from radially outer end of the blade 103. The adjusting lever 301 is connected between the free end portion 302 and the adjusting device 303 outside the flow channel 105 each so firmly connected that the adjusting lever 301, a movement of the Adjustment device 303 eg transformed into a rotational movement of the adjusting element 107 and 117, respectively. The adjusting device 303 is arranged outside the flow channel 105 and coupled to the adjusting lever 301. The adjusting device 303 has a hydraulic, pneumatic or electric drive. The adjusting device 303 can be controlled by means of a control unit, so that the adjusting lever 301 and consequently the flow cross-section of the flow channel 105 can be adjusted in a targeted manner via the free end section 302.

A plurality of further adjusting elements 107 or 117 of further blades 103, 104 and 214, which are arranged along the circumferential direction 102 on the carrier ring 101, can be present and individually adjustable by means of corresponding adjusting elements 107, 117. Thus, over the entire circumference of the nozzle ring apparatus 100, a particular flow profile of working fluid or vapor can be adjusted through the respective flow channels 105 between the respective blades 103, 104 and 214, respectively. Thus, efficient and accurate control of the flow of the nozzle ring apparatus 100 with working fluid can be achieved.

Fig. 4 FIG. 12 shows a schematic diagram of a nozzle ring apparatus 100 according to an exemplary embodiment of the present invention. The nozzle ring device 100 is housed in a housing 450. The adjusting device 303 is arranged outside the housing 450 and connected via the adjusting lever 301 with the adjusting elements 107 and 117 and thus with an interior of the housing 450. The incoming working fluid the steam turbine is supplied via a line 403. The working fluid flows through a quick-acting valve 401 and a main regulator valve 402 before being supplied to the nozzle ring device.

How out Fig. 4 can be seen, the nozzle ring device 100 according to the present invention (in Fig. 4 shown) fewer components outside the housing 450, as the nozzle ring device according to the prior art (in Fig. 5 shown).

In addition, it should be noted that "encompassing" does not exclude other elements or steps, and "a" or "an" does not exclude a multitude. It should also be appreciated that features or steps described with reference to one of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference signs in the claims are not to be considered as limiting.

Claims (12)

A nozzle ring apparatus (100) for a steam turbine (300) comprising the nozzle ring device
a support ring (101) extending along a circumferential direction (102),
a first blade (103) disposed on the support ring (101) and extending from the support ring (101) along a radial direction (312),
a second blade (104) disposed on the support ring (101) and extending from the support ring (101) in the radial direction (312),
wherein the second blade (104) is spaced from the first blade (103) along the circumferential direction (102) such that a flow channel (105) is provided between the first blade (103) and the second blade (104) the first blade (103) has a first base body (106) and a first adjusting element (107), wherein the first adjusting element (107) is adjustably arranged relative to the first base body (106) such that a blade spacing (108) between the first Adjustment (107) and the second blade (104) is variable. Nozzle ring device according to claim 1,
wherein the first adjustment member (107) between a retracted state in which there is a maximum blade clearance (211) between the first adjustment member (107) and the second blade (104), and an extended state in which a minimum blade clearance (212) between the first adjusting element (107) and the second blade (104) is present, is adjustable. Nozzle ring device according to claim 2,
wherein the first adjustment element (107) is designed such that in the retracted state between the first adjustment element (107) and the first base body (106), a common homogeneous flow surface (203) is formed. The nozzle ring device according to one of claims 1 to 3, wherein the first adjustment element (107) is arranged extendable and retractable on the first base body (106) such that the blade spacing (108) between the first adjustment element (107) and the second blade (104 ) is changeable. Nozzle ring device according to one of claims 1 to 3, wherein the first adjusting element (107) forms an axis of rotation (122) about which the first adjusting element (107) is rotatably arranged on the first base body (106) such that the blade spacing (108) between the first adjusting element (107) and the second blade (104) is variable. A nozzle ring device for a steam turbine according to claim 5,
wherein the first base body (106) has a receiving groove (210),
wherein the first adjusting element (107) is arranged in the receiving groove (210),
wherein the first adjustment element (107) is rotatably arranged about the rotation axis (122) such that the first adjustment element (107) can be rotated in or out of the reception groove (210) in the direction of the second blade (104). A nozzle ring device according to claim 6, further comprising an adjusting device (303),
wherein the first adjusting element (107) has a first section (110) which is arranged in the receiving groove (210),
wherein the first adjusting element (107) has a second section (120) which projects out of the receiving groove (210) in the radial direction (312),
wherein the second portion (120) forms a free end portion (302), and
wherein the first adjusting element (107) at the free end portion (302) has an adjusting lever (301) which is coupled to the first adjusting element (107) on the one hand and the adjusting device (303) on the other hand such that with the adjusting device (303) by means of displacement of the adjusting lever (301) a rotation of the first adjusting element (107) is controllable. Nozzle ring device according to one of claims 1 to 7, wherein the second blade (104) has a second base body (206) and a second adjusting element (207),
wherein the second adjustment element (207) is adjustably arranged relative to the second base body (206) such that a further blade clearance (208) is provided between the second adjustment element (207) and a third blade (214) which is displaced from the second blade (104). along the circumferential direction (102) is arranged spaced, is variable. Nozzle ring device according to claim 8,
wherein the second blade (104) has a further second adjustment element,
wherein the further second adjusting element is adjustably arranged relative to the second base body (206) such that the blade spacing between the further second adjusting element of the second blade (104) and the first adjusting element (107) is variable. Steam turbine (300), comprising
a nozzle ring device (100) according to any one of claims 1 to 9 and
a blade system (310),
wherein the nozzle ring device is disposed upstream of the blade ring. A method of manufacturing a nozzle ring apparatus (100) for a steam turbine (300), comprising the method
Providing a carrier ring (101) which extends along a circumferential direction (102),
Providing a first blade (103) disposed on the support ring (101) such that the first blade (103) extends from the support ring (101) along a radial direction (312),
Providing a second blade (104) disposed on the support ring (101) such that the second blade (104) extends from the support ring (101) in the radial direction (312),
wherein the second blade (104) is spaced from the first blade (103) along the circumferential direction (102) such that a flow channel (105) is provided between the first blade (103) and the second blade (104) the first blade (103) has a first basic body (106) and a first adjusting element (107),
adjustably locating the first adjustment member (107) relative to the first base (106) such that a blade clearance (108) is variable between the first adjustment member (107) and the second blade (104). Method according to claim 11,
Drilling a bore (213) in the carrier ring (101), arranging the first adjustment element (107) in the carrier ring (101),
Eroding the first blade (103) and the second blade (104) from the carrier ring (101) after arranging the first adjustment element (107) so that between the first blade (103) and the second blade (104) the flow channel (105 ) is formed and the first adjusting element (107) forms a homogeneous flow surface (203) with the first base body (106).

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