A stator blade device in a steam turbine and a steam turbine

Abstract

The present invention discloses a stator blade device in a steam turbine and a steam turbine including the stator blade device, which belong to the technical field of steam turbines. The stator blade device includes a fixed stator blade ring, a plurality of fixed stator blades, a rotating stator blade ring, a plurality of rotating stator blades and a transmission part. The plurality of fixed stator blades are connected to the fixed stator blade ring, and the plurality of rotating stator blades are connected to the rotating stator blade ring. The rotating stator blade ring and the fixed stator blade ring are sleeved, and the rotating stator blades and the fixed stator blades are connected and cooperate through an adjusting seal structure to form stator blades. The transmission part is connected to the rotating stator blade ring and is used to drive the rotating stator blade ring to rotate after receiving an external force. The adjusting seal structure includes a tooth group and a tooth groove group respectively arranged on the fixed stator blade and the rotating stator blade. The tooth group includes a plurality of sealing teeth arranged at intervals, and the tooth groove group includes a plurality of sealing tooth grooves arranged at intervals. The sealing teeth are inserted and connected to the sealing tooth grooves to achieve labyrinth sealing, and when the rotating stator blade ring rotates, the insertion depth of the sealing teeth in the sealing tooth grooves is adjusted to adjust the volume of the stator blades.

Description

Technical Field

[0001] The present invention belongs to the technical field of steam turbines, and particularly relates to a stator blade device in a steam turbine and a steam turbine. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam power device. After steam with a certain pressure and temperature enters the steam turbine, the thermal energy of the steam is converted into the kinetic energy of a high-speed steam flow through the nozzle vane cascade, so that the high-speed steam flow sprays out from the nozzle in a certain direction and enters the moving vane cascade, pushing the impeller to rotate and do work, and finally converting the kinetic energy of the steam into the mechanical energy of the rotation of the steam turbine rotor.

[0003] A steam turbine mainly includes a rotor, a stator, etc. Among them, the stator includes a volute, stator blades, etc. The volute is the outer shell of the steam turbine, which plays a role in enclosing and supporting, separates the flow passage part from the atmosphere, forms a closed steam chamber, and ensures that the steam completes the energy conversion process inside the steam turbine. The stator blades are located inside the volute and mainly play a role in guiding the steam flow and accelerating the steam.

[0004] As a type of steam turbine, the cantilever steam turbine generator has good prospects in small-flow steam power generation due to its simple structure. However, affected by the upstream process, the steam flow rate, pressure, temperature, etc. often fluctuate, and variable operating condition adjustment is required. Summary of the Invention

[0005] The purpose of the present invention is to provide a stator blade device in a steam turbine and a steam turbine, which are used to reduce the overall power generation attenuation amplitude under variable operating conditions.

[0006] The technical solution of the present invention is as follows:

[0007] A stator blade device in a steam turbine includes:

[0008] A fixed stator blade ring and a plurality of fixed stator blades, and the plurality of fixed stator blades are connected to the fixed stator blade ring and are circumferentially distributed along the fixed stator blade ring;

[0009] A rotating stator blade ring and a plurality of rotating stator blades, and the plurality of rotating stator blades are connected to the rotating stator blade ring and are circumferentially distributed along the rotating stator blade ring; the rotating stator blade ring and the fixed stator blade ring are sleeved, and the rotating stator blades and the fixed stator blades are connected through an adjustable sealing structure and cooperate to form stator blades;

[0010] A transmission part, which is connected to the rotating stator blade ring, and the transmission part is used to drive the rotating stator blade ring to rotate after receiving an external force drive;

[0011] The adjusting and sealing structure includes a tooth group and a tooth groove group. Any one of the tooth group and the tooth groove group is arranged on the stationary stator blade, and the other is arranged on the rotating stator blade. The tooth group includes a plurality of sealing teeth arranged at intervals, and the tooth groove group includes a plurality of sealing tooth grooves arranged at intervals. A plurality of the sealing teeth in the tooth group are inserted and connected to a plurality of the sealing tooth grooves in the tooth groove group to achieve labyrinth sealing, and when the rotating stator blade ring rotates, the insertion depth of the sealing teeth in the corresponding sealing tooth grooves is adjusted.

[0012] In a static blade device of an optional steam turbine, the depth direction of the sealing tooth groove is parallel to a plane perpendicular to the rotation axis of the rotating stator blade ring.

[0013] In a static blade device of an optional steam turbine, the tooth group is arranged on the stationary stator blade, and the tooth groove group is arranged on the rotating stator blade.

[0014] In a static blade device of an optional steam turbine, the thickness of the stationary stator blade is 2 / 5 to 3 / 5 of the thickness of the stator blade.

[0015] In a static blade device of an optional steam turbine, the rotating stator blade ring is sleeved outside the stationary stator blade ring, and the rotating stator blade and the stationary stator blade are located between the rotating stator blade ring and the stationary stator blade ring.

[0016] In a static blade device of an optional steam turbine, the transmission part and the rotating stator blade ring are connected and driven by tooth meshing.

[0017] In a static blade device of an optional steam turbine, the transmission part includes at least one driving gear, and a rack meshing with the driving gear is arranged on the rotating stator blade ring, and the rack is arranged along the circumferential direction of the rotating stator blade.

[0018] In a static blade device of an optional steam turbine, the rack winds around the rotating stator blade ring for one week.

[0019] In a static blade device of an optional steam turbine, the rotating stator blade ring is provided with the same number of racks as the driving gear, and the driving gear meshes with the corresponding rack.

[0020] In a static blade device of an optional steam turbine, the transmission part includes three driving gears, and the three driving gears are evenly distributed along the circumferential direction of the rotating stator blade ring.

[0021] In a static blade device of an optional steam turbine, the rotating stator blade ring is sleeved outside the stationary stator blade ring, and the rotating stator blade and the stationary stator blade are located between the rotating stator blade ring and the stationary stator blade ring;

[0022] The rack is disposed on the circumferential outer side of the rotating stator blade ring, and the driving gear is located on the circumferential outer side of the rotating stator blade ring.

[0023] In a static blade device of an optional steam turbine, a plurality of the fixed stator blades are circumferentially and uniformly distributed along the fixed stator blade ring, and a plurality of the rotating stator blades are circumferentially and uniformly distributed along the rotating stator blade ring.

[0024] A steam turbine includes the static blade device in the steam turbine as described in any one of the above.

[0025] In an optional steam turbine, the transmission part includes at least one driving gear, a rack meshing with the driving gear is arranged on the rotating stator blade ring, and the rack is arranged along the circumference of the rotating stator blade;

[0026] The steam turbine further includes a rotating shaft, a power device corresponding to the driving gear, and a volute; the static blade device in the steam turbine is installed in the volute, the power device is arranged outside the volute, an output end of the power device is connected to the rotating shaft, the rotating shaft extends into the volute and is connected to the driving gear, and the power device is used to drive the rotating shaft to rotate so as to drive the driving gear to rotate;

[0027] A sealing structure is provided at the place where the rotating shaft penetrates through the volute.

[0028] In an optional steam turbine, the sealing structure adopts labyrinth sealing, and a sealing gas inlet channel communicating with the sealing structure is provided on the volute.

[0029] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art:

[0030] In the present invention, by rotating the rotating stator blade ring, the insertion depth of the sealing teeth into the sealing tooth grooves in the regulating sealing structure can be adjusted, so as to adjust the volume of the stator blade, and further change the throat size and the volume flow rate of the gas that can pass through. Therefore, under variable working conditions, the present invention can adapt to different working conditions by adjusting the rotation angle of the rotating stator blade ring, without the need to set a regulating valve for pressure reduction, thereby reducing the attenuation amplitude of the overall power generation. Description of the Drawings

[0031] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention.

[0032] Figure 1 It is a structural schematic diagram of a static blade device in a steam turbine (not assembled in the figure);

[0033] Figure 2 and Figure 3 is a schematic structural diagram of a stationary blade device in a steam turbine;

[0034] Figure 4 is Figure 3 the sectional view taken along A-A in

[0035] Figure 5 is a schematic structural diagram of the stationary blade when the rotation angle of the rotating stationary blade ring is 0°;

[0036] Figure 6 is a schematic structural diagram of the stationary blade after the rotating stationary blade ring rotates a certain angle;

[0037] Figure 7 is a comparison diagram of the power generation of a steam turbine in the present invention and a conventional steam turbine under various working conditions;

[0038] Figure 8 is an installation schematic diagram of the stationary blade device in a steam turbine in the present invention.

[0039] Explanation of reference numerals:

[0040] 1: Fixed stationary blade ring; 2: Fixed stationary blade; 3: Rotating stationary blade ring; 4: Rotating stationary blade; 5: Driving gear; 6: Rack; 7: Sealing tooth; 8: Sealing tooth groove; 9: Rotating shaft; 10: Power device; 11: Annular sealing tooth; 12: Sealing air inlet passage; 13: Volute; 14: Limit pin. Detailed implementation manners

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0042] To make the drawings concise, only the parts related to the present invention are schematically shown in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, parts with the same structure or function are only schematically shown as one of them, or only one of them is marked. In this article, "one" not only means "only this one", but also means "more than one" situation.

[0043] Embodiment 1

[0044] Refer to Figures 1 to 6, this embodiment provides a stationary blade device in a steam turbine, including a stationary blade ring 1, a plurality of stationary blades 2, a rotating blade ring 3, a plurality of rotating blades 4, and a transmission part. The plurality of stationary blades 2 are connected to the stationary blade ring 1 and are circumferentially distributed along the stationary blade ring 1. The plurality of rotating blades 4 are connected to the rotating blade ring 3 and are circumferentially distributed along the rotating blade ring 3. The rotating blade ring 3 and the stationary blade ring 1 are sleeved, and the rotating blades 4 and the stationary blades 2 are connected and cooperated through an adjusting seal structure to form a stationary blade. The transmission part is connected to the rotating blade ring 3 and is used to drive the rotating blade ring 3 to rotate after receiving an external force.

[0045] The adjusting seal structure includes a tooth group and a tooth groove group. Any one of the tooth group and the tooth groove group is arranged on the stationary blade 2, and the other is arranged on the rotating blade 4. The tooth group includes a plurality of sealing teeth 7 arranged at intervals, and the tooth groove group includes a plurality of sealing tooth grooves 8 arranged at intervals. The plurality of sealing teeth 7 in the tooth group are inserted and connected to the plurality of sealing tooth grooves 8 in the tooth groove group to achieve labyrinth sealing, and the insertion depth of the sealing teeth 7 in the corresponding sealing tooth grooves 8 is adjusted when the rotating blade ring 3 rotates.

[0046] In this embodiment, by rotating the rotating blade ring 3, the insertion depth of the sealing teeth 7 in the sealing tooth grooves 8 in the adjusting seal structure can be adjusted, thereby adjusting the volume of the stationary blade, and further changing the throat size and the volume flow rate of the gas that can pass through. Therefore, under variable operating conditions, the present invention can adapt to different operating conditions by adjusting the rotation angle of the rotating blade ring 3, without the need to set a regulating valve for pressure reduction, thereby reducing the attenuation amplitude of the overall power generation.

[0047] The following further describes the stationary blade device in the steam turbine of this embodiment.

[0048] The rotating blade ring 3 is sleeved outside the stationary blade ring 1, and the rotating blades 4 and the stationary blades 2 are located between the rotating blade ring 3 and the stationary blade ring 1. The rotating blades 4 on the rotating blade ring 3 correspond to the stationary blades 2 on the stationary blade ring 1 one by one, and one rotating blade 4 and the corresponding one stationary blade 2 cooperate to form a complete stationary blade. Preferably, all the stationary blades 2 on the stationary blade ring 1 are circumferentially evenly distributed along the stationary blade ring 1, and all the rotating blades 4 on the rotating blade ring 3 are circumferentially evenly distributed along the rotating blade ring 3. Of course, in other embodiments, it may also be that the stationary blade ring 1 is sleeved outside the rotating blade ring 3, the stationary blades 2 are not circumferentially evenly distributed along the stationary blade ring 1, the rotating blade ring 3 is not circumferentially evenly distributed along the rotating blade ring 3, etc., which are not limited here.

[0049] A labyrinth seal structure (that is, the above-mentioned adjusting seal structure) is arranged at the mating surface of the rotating blade 4 and the stationary blade 2, which can reduce the leakage amount. Further, as Figure 3, the depth direction of the sealing tooth groove 8 (i.e., the insertion depth direction in which the sealing tooth 7 is inserted into the sealing tooth groove 8) is parallel to the plane perpendicular to the rotation axis of the stationary vane ring 3.

[0050] In this embodiment, it is preferably: in all the adjustable sealing structures, the tooth groups are arranged on the stationary vanes 2 and the tooth groove groups are arranged on the rotating vanes 4. Of course, in other embodiments, the tooth groups can also be arranged on the rotating vanes 4, the tooth groove groups can be arranged on the stationary vanes 2, or part of the tooth groups can be arranged on the rotating vanes 4 and part of the tooth groups can be arranged on the stationary vanes 2, and so on.

[0051] For the convenience of description, the rotating vane ring 3 when the insertion depth of the sealing tooth 7 inserted into the corresponding sealing tooth groove 8 is the largest is defined as having a rotation angle of 0°. When the rotation angle of the rotating vane ring 3 is 0°, it is the maximum working condition. At this time, the throat is the largest and the gas volume flow rate that can pass through is the largest; when the rotation angle of the rotating vane ring 3 increases, the insertion depth of the sealing tooth 7 inserted into the corresponding sealing tooth groove 8 slowly decreases, the throat decreases, and the gas volume flow rate that can pass through becomes smaller.

[0052] When the rotating vane ring 3 rotates (here it corresponds to the situation after the rotating vane ring 3 rotates and its rotation angle becomes larger), the rotating vane 4 moves relative to the stationary vane 2, the flow passage changes, and the flow capacity becomes smaller. This adapts to the new working condition, but also deviates from the design point and the efficiency decreases accordingly. For this reason, chamfering operations can be carried out at each mating part (the mating parts include Figure 6 the places pointed to by a and b in etc.; among them, Figure 6 the place pointed to by a in has been chamfered, and the place pointed to by b in has not been chamfered) to reduce the flow separation, eddy current and pressure loss caused by sharp corners, etc., and reduce the loss of efficiency.

[0053] The rotatable angle of the rotating vane ring 3 depends on the maximum insertion depth of the sealing tooth 7 in the corresponding sealing tooth groove 8, that is, it is ensured that after rotation, at least one sealing tooth 7 in the adjustable sealing structure of the vane is inserted into the corresponding sealing tooth groove 8; when exceeding this threshold, the rotating vane 4 and the stationary vane 2 are completely separated, a gap appears between them, and the flow field will change, thus unable to meet the adjustment requirements of variable working conditions. In order to increase the adjustable range, the vane can be specially designed: increasing the thickness of the leading edge (for example, the leading edge thickness is about 1.3 times that of the conventionally designed vane), thickening the thickness of the stationary vane 2 (for example, the thickness of the stationary vane is 2 / 5 to 3 / 5 of the vane thickness, and more preferably about 1 / 2), ensuring that the throat position is close to the trailing edge of the vane (for example, in the Figure 5 shown direction, the throat position is located at about 3 / 5 of the vane from left to right), and so on.

[0054] In this embodiment, the transmission part and the rotating stator blade ring 3 are preferably connected and driven by gear meshing. Specifically, the transmission part includes at least one driving gear 5, and a rack 6 meshing with the driving gear 5 is arranged on the rotating stator blade ring 3, and the rack 6 is arranged along the circumferential direction of the rotating stator blade 4. The driving gear 5 is connected to an external power device 10 and rotates under the drive of the external power device 10, so as to drive the rotating stator blade ring 3 to rotate through gear meshing transmission.

[0055] As Figure 2 shown, in this embodiment, the transmission part includes three driving gears 5, and the three driving gears 5 are evenly distributed along the circumferential direction of the rotating stator blade ring 3, and the three driving gears 5 are all located on the circumferential outer side of the rotating stator blade ring 3; the rack 6 winds around the rotating stator blade ring 3 for one week, and the rack 6 is arranged on the circumferential outer side of the rotating stator blade ring 3. The rack 6 can be integrally processed with the rotating stator blade ring 3, or can be processed separately and then assembled.

[0056] According to the actual cost and processing difficulty, it is also possible to choose to only machine the tooth surface near the driving gear 5 (that is, the rack 6 is no longer arranged to wind around the rotating stator blade ring 3 for one week), and no machining is required at other positions (that is, the same number of racks 6 as the driving gear 5 are arranged on the rotating stator blade ring 3, and the driving gear 5 meshes with the corresponding rack 6).

[0057] The stator blade device in the steam turbine provided by this embodiment is applicable to most steam turbines that require variable operating conditions.

[0058] Embodiment 2

[0059] Refer to Figures 1 to 8 , this embodiment provides a steam turbine, which is provided with the stator blade device in the steam turbine as described in Embodiment 1.

[0060] For a conventional steam turbine, after the stator blades are designed and finalized, the volume flow rate that can pass through is fixed, and the efficiency under the design conditions is considerable. However, under variable operating conditions, a regulating valve needs to participate in the regulation, and the power generation reduction will be obvious. Compared with this, although the efficiency at the design point of the steam turbine provided by this embodiment is lower due to the stator blade profile not being as good as the conventional design, under variable operating conditions, the rotating stator blade ring 3 can be adjusted to adapt to the change of the operating conditions without the need for a regulating valve to reduce pressure. Therefore, although the efficiency decays, the overall power generation reduction amplitude is smaller. As Figure 7 shown, the dotted line represents a conventional steam turbine, and the solid line represents the steam turbine in this embodiment. It can be clearly seen that the overall power generation reduction amplitude of the steam turbine in this embodiment is smaller.

[0061] Specifically, as Figure 8 shown, the steam turbine further includes a rotating shaft 9 corresponding to the driving gear, a power device 10, and a volute 13.

[0062] The stationary blade device in the steam turbine is installed in the volute 13, and the power device 10 is arranged outside the volute 13. The output end of the power device 10 is connected to the rotating shaft 9, and the rotating shaft 9 extends into the volute 13 and is connected to the driving gear 5. The power device 10 is used to drive the rotating shaft 9 to rotate so as to drive the driving gear 5 to rotate. The power device 10 can be a motor or the like, and there is no specific limitation. One end of the rotating shaft 9 is fixedly connected to the output end of the power device 10, and the other end is fixedly installed with the driving gear 5. The driving gear 5 can be fixed on the rotating shaft 9 by means of welding connection, threaded fastener connection, etc., or can be directly integrally formed on the rotating shaft 9, and there is no limitation here. The part of the rotating shaft 9 passing through the volute 13 is the part between its two ends, that is, the middle part of the rotating shaft 9 penetrates the volute 13, and a sealing structure is provided at the penetration to prevent the overall airtightness of the volute 13 from being damaged due to the setting of the rotating shaft 9.

[0063] Specifically, the sealing structure adopts labyrinth seal, and the volute 13 is provided with a sealing gas inlet passage 12 communicating with the sealing structure. The first-step sealing is carried out through the labyrinth seal, and the structure of the labyrinth seal is ventilated through the sealing gas inlet passage 12 for further sealing. The double sealing ensures the airtightness of the volute 13.

[0064] In order to ensure the smooth transmission of the torque on the rotating shaft 9, it is preferably that: at the labyrinth seal, no structure is provided on the rotating shaft 9, and only a plurality of annular sealing teeth 11 arranged in sequence are provided on the volute 13.

[0065] The fixed stator blade ring 1 is fixedly installed on the volute 13. The rotating stator blade ring 3 is sleeved on the fixed stator blade ring 1, and the rack 6 on the circumferential outer side of the rotating stator blade ring 3 meshes with three driving gears 5 (the three driving gears 5 can be respectively configured with the rotating shaft 9 and the power device 10); two limit pins 14 can be connected to the volute 13 (the connection method can be bolt connection, welding, etc.), and the two limit pins 14 are respectively arranged on both axial sides of the rotating stator blade ring 3, and the two limit pins 14 cooperate to limit the axial position of the rotating stator blade ring 3; the fixed stator blade ring 1, the three driving gears 5 and the two limit pins 14 cooperate with each other to position and install the rotating stator blade ring 3. Among them, the weight of the rotating stator blade ring 3 and the rotating stator blades 4 thereon is mainly borne by the fixed stator blade ring 1 and the fixed stator blades 2.

[0066] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, provided that these changes fall within the scope of the claims of the present invention and their equivalent technologies, they still fall within the protection scope of the present invention.

Claims

1. A stationary blade device in a steam turbine, characterized in that, Comprising: A fixed stator blade ring and a plurality of fixed stator blades, the plurality of fixed stator blades being connected to the fixed stator blade ring and circumferentially distributed along the fixed stator blade ring; A rotating stator blade ring and a plurality of rotating stator blades, the plurality of rotating stator blades being connected to the rotating stator blade ring and circumferentially distributed along the rotating stator blade ring; the rotating stator blade ring and the fixed stator blade ring are sleeved, and the rotating stator blades and the fixed stator blades are connected and cooperated through an adjusting seal structure to form stator blades; A transmission part, the transmission part being connected to the rotating stator blade ring, and the transmission part being configured to drive the rotating stator blade ring to rotate after receiving an external force drive; The adjusting seal structure includes a tooth group and a tooth groove group, any one of the tooth group and the tooth groove group is arranged on the fixed stator blade, and the other is arranged on the rotating stator blade; the tooth group includes a plurality of sealing teeth arranged at intervals, the tooth groove group includes a plurality of sealing tooth grooves arranged at intervals, and a plurality of the sealing teeth in the tooth group are inserted and connected to a plurality of the sealing tooth grooves in the tooth groove group to achieve labyrinth sealing, and when the rotating stator blade ring rotates, the insertion depth of the sealing teeth in the corresponding sealing tooth grooves is adjusted.

2. The stationary blade device in the steam turbine according to claim 1, wherein, The depth direction of the sealing tooth groove is parallel to the plane perpendicular to the rotation axis of the rotating stator blade ring.

3. The stator vane device in the steam turbine according to claim 1, characterized in that, The tooth group is arranged on the fixed stator blade, and the tooth groove group is arranged on the rotating stator blade.

4. The stationary blade device in the steam turbine according to claim 1, characterized in that, The thickness of the fixed stator blade is 2 / 5 to 3 / 5 of the thickness of the stator blade.

5. The stator vane device in a steam turbine according to claim 1, characterized in that, The rotating stator blade ring is sleeved outside the fixed stator blade ring, and the rotating stator blades and the fixed stator blades are located between the rotating stator blade ring and the fixed stator blade ring.

6. The stator blade device in a steam turbine according to claim 1, characterized in that, The transmission part and the rotating stator blade ring are connected and transmitted through tooth meshing.

7. The stator blade device in a steam turbine according to claim 6, characterized in that, The transmission part includes at least one driving gear, and a rack meshing with the driving gear is arranged on the rotating stator blade ring, and the rack is arranged circumferentially along the rotating stator blade.

8. The stator blade device in a steam turbine according to claim 7, characterized in that, The rack winds around the rotating stator blade ring for one week.

9. The stator blade device in a steam turbine according to claim 7, characterized in that, The rotating stator blade ring is provided with the same number of racks as the driving gear, and the driving gear meshes with the corresponding rack.

10. The stator vane device in the steam turbine according to claim 7, characterized in that, The transmission part includes three driving gears, and the three driving gears are evenly distributed circumferentially along the rotating stator blade ring.

11. The stator vane device in the steam turbine according to claim 7, characterized in that, The rotating stator blade ring is sleeved outside the fixed stator blade ring, and the rotating stator blades and the fixed stator blades are located between the rotating stator blade ring and the fixed stator blade ring; The rack is arranged on the circumferential outer side of the rotating stator blade ring, and the driving gear is located on the circumferential outer side of the rotating stator blade ring.

12. The stator vane device in a steam turbine according to claim 1, characterized in that, A plurality of the fixed stator blades are evenly distributed circumferentially along the fixed stator blade ring, and a plurality of the rotating stator blades are evenly distributed circumferentially along the rotating stator blade ring.

13. A steam turbine, characterized in that, Comprising the stator blade device in the steam turbine according to any one of claims 1 to 12.

14. The steam turbine according to claim 13, characterized in that, The transmission part includes at least one driving gear, and a rack meshing with the driving gear is arranged on the rotating stator blade ring, and the rack is arranged circumferentially along the rotating stator blade; The steam turbine further includes a rotating shaft corresponding to the driving gear, a power device, and a volute; the stationary blade device in the steam turbine is installed in the volute, the power device is arranged outside the volute, an output end of the power device is connected to the rotating shaft, the rotating shaft extends into the volute and is connected to the driving gear, and the power device is used for driving the rotating shaft to rotate so as to drive the driving gear to rotate; A sealing structure is provided at a position where the rotating shaft penetrates through the volute.

15. The steam turbine according to claim 14, characterized in that, The sealing structure adopts labyrinth sealing, and a sealing air inlet channel communicating with the sealing structure is provided on the volute.

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