CN203515691U

CN203515691U - Regulating wheel and industrial steam turbine with same

Info

Publication number: CN203515691U
Application number: CN201320614971.6U
Authority: CN
Inventors: 米兰·克里斯塔; 托马什·波特梅希尔
Original assignee: Siemens AG
Current assignee: Siemens Energy Global GmbH and Co KG
Priority date: 2013-09-30
Filing date: 2013-09-30
Publication date: 2014-04-02
Anticipated expiration: 2023-09-30

Abstract

The utility model relates to a regulating wheel for a turbine. The regulating wheel for the turbine aims to reduce vibration of a blade on the regulating wheel. The regulating wheel for the turbine comprises the blade, a shrouding ring located on the top of the blade and a damping element, wherein the damping element is a tie bar embedded in a groove in the top end of the shrouding ring. The groove extends in the shrouding ring along the outer circumference of the regulating wheel. The utility model further relates to an industrial steam turbine comprising the regulating wheel.

Description

Regulating wheel and industrial steam turbine thereof

Technical Field

The present invention relates to an adjustment wheel, and more particularly to an adjustment wheel for a turbine. Furthermore, the invention also relates to an industrial steam turbine with the regulating wheel.

Background

The turbine can be used for providing power for equipment such as a generator, a compressor, a pump and the like, and can be applied to a power plant, a chemical plant, a sugar mill, a textile mill, a steel mill, a paper mill, a mine and the like. The associated system generally includes: a steam generator that changes water into steam by heating (e.g., by coal, natural gas, or fuel oil); a steam turbine, which converts energy contained in steam into kinetic energy to drive various equipments. Within the turbine there are stationary vanes on the cylinder and moving vanes on the rotor. When the steam turbine is operated, the expanded high-pressure steam passes through several stages in which stationary blades and moving blades are alternately arranged to rotate the rotor. The pressure in the turbine is continuously reduced as the steam passes through successive turbine stages. Different applications also require steam turbines having various steam flow configurations, such as condensing or non-condensing steam extraction, once-through or controlled steam extraction, or controlled steam admission.

In the case of condensate bleed, the steam is bled after passing through the turbine blades and is directed to a condenser for conversion into water, which may ultimately be returned to the steam generator. In the case of extraction, steam is extracted from a turbine and used in other applications (e.g., preheating water boilers, etc.) where steam of a particular pressure and temperature is required. The extraction position may be located anywhere on the steam path that is in condition, and the extracted steam may be controlled by a valve.

During the operation of the industrial steam turbine, the blades on the regulating wheel vibrate due to the impact of high-temperature and high-pressure steam. In severe cases, this will affect the proper operation of the industrial steam turbine. Currently, reinforcement is usually provided by tie-rods passing through the middle of the blade.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a vibration that is used for the regulating wheel of turbine in order to reduce blade on the regulating wheel. The adjustment wheel for a turbomachine comprises a blade, a shroud at the tip of the blade, and a damping element, wherein the damping element is a lacing wire embedded in a groove at the tip of the shroud. The groove extends along the outer circumference of the adjustment wheel on the shroud.

According to one aspect of the invention, the groove is modified by a groove shape having a "U" shaped cross-section to embed the lacing wire.

According to the utility model discloses a further aspect, the lacing wire embedding is through rolling process deformation the groove.

According to a further aspect of the invention, the adjustment wheel further comprises a further damping element located at the top end of the shroud, the grooves of the two damping elements being parallel to each other.

An object of the utility model is also to provide an industrial steam turbine. Such an industrial steam turbine comprises the regulating wheel described above.

Drawings

The drawings are only intended to illustrate and explain the present invention and do not limit the scope of the invention. Wherein,

fig. 1 schematically illustrates an industrial steam turbine having an adjusting wheel according to the invention;

FIG. 2 shows an enlarged partial view C of FIG. 1;

fig. 3 illustrates a damping element according to an embodiment of the present invention;

FIG. 4 shows the top of the shroud of FIG. 3 prior to insertion of the lacing wire;

fig. 5 shows two damping elements according to another embodiment of the invention;

figure 6 shows the top of the shroud of figure 5 prior to insertion of the lacing wire.

Description of reference numerals:

1 industrial steam turbine 29 rotor

11 turbine cylinder 291 turbine axis

12-row cylinder 292 nozzle chamber

151 steam inlet 293 pin

C partial view 294 adjustment wheel

2941 girdle 2942 lacing wire

296 blade

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or structurally similar elements that perform the same function, and elements having the same structure or function are depicted schematically, or are identified. For the sake of simplicity, only the parts relevant to the present invention are schematically shown in the drawings, and they do not represent the actual structure as a product. "connected" herein means directly connected or connected through a third party.

As shown in FIGS. 1 and 2, an adjustment wheel 294 for a turbine includes a vane 296, a shroud 2941 positioned at a top of the vane 296, and a damping element. The damping element is a lacing 2942 that fits into a slot at the top end of the shroud 2941. The slot extends along the outer circumference of the adjustment wheel 294 at the top of the shroud 2941. During rotation of the adjustment wheel 294 about the turbine axis 291, the vibration of the vane 296 is reduced by the friction between the shroud 2941 and the tie 2942. Although the figures show the turbine block 11 connected to the exhaust casing 12 as an example, the damping element can also be used for damping in a gas turbine. The adjustment wheel 294 is located between the steam inlet 151 and a first stage stationary vane ring (not shown) connected to the turbine block 11. The enlarged partial view C of fig. 2 shows the adjustment wheel 294 disposed adjacent the nozzle chamber 292 corresponding to the steam inlet 151. The root of the vane 296 is secured to the adjustment wheel 294 by a pin 293 and those skilled in the art will appreciate that the adjustment wheel 294 may include a plurality of vanes 296 thereon.

Fig. 3-6 show further details of the shroud 2941 in which the tie bars 2942 are embedded in the grooves by a rolling process using a machine tool. In the embodiment shown in figures 3 and 4, the "U" shaped opening is reduced by first machining a slot having a "U" shaped cross-section in the top end of the shroud 2941, then placing the tie bar 2942 into the slot and then deforming the slot by a rolling process to surround the tie bar 2942. The length of the "U" shaped opening will be less than the diameter of the tie 2942 and the pre-load caused by the rolling process will create a contact pressure against the tie 2942. The tie bar 2942 is made of a rigid material, such as a metallic material. The tensioned tie bar 2942 fits into the groove and holds the blade 296 against the adjustment wheel 294 as little as possible without vibration, thereby counteracting the centrifugal forces generated during turbine operation without disengaging from the groove. In the embodiment shown in FIGS. 5 and 6, two damping elements are used, with the other damping element being located in another slot at the top end of the same shroud 2941. The slots of the two damping elements are spaced apart and parallel to each other and the lacing wires 2942 are embedded in the slots in a similar manner to that shown in figures 3 and 4.

It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein can be combined as a whole to form other embodiments as would be understood by those skilled in the art.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.

The above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations that may be made by those skilled in the art without departing from the spirit and principles of the invention should be considered within the scope of the invention.

Claims

1. An adjustment wheel (294) for a turbine, comprising:

a vane (296), a shroud (2941) at the top of the vane (296), and a damping element, wherein the damping element is a tie-bar (2942) inserted into a groove at the top of the shroud (2941);

the groove extends along the outer circumference of the adjustment wheel (294) on the shroud (2941).

2. The adjustment wheel (294) according to claim 1, characterized in that the groove is modified by a groove shape having a "U" -shaped cross-section to embed the lacing wire (2942).

3. The adjustment wheel (294) of claim 1, wherein the tie bar (2942) is embedded in the groove that is deformed by a rolling process.

4. The adjustment wheel (294) of claim 1, wherein the adjustment wheel (294) further comprises another damping element at a top end of the shroud (2941), the grooves of the two damping elements being parallel to each other.

5. An industrial steam turbine, characterized by comprising an adjustment wheel (294) according to any of the preceding claims.