Turbine steam chamber structure with two independent cavities

Abstract

The invention relates to a turbine steam chamber structure with two independent cavities. The turbine steam chamber structure comprises an upper half steam chamber assembly, a lower half steam chamber assembly, an upper half stationary blade assembly and a lower half stationary blade assembly. The upper half steam chamber assembly comprises a steam chamber A, a separation rib A and a steam outlet hole A; the upper half stationary blade assembly comprises a fixed seat A, a set screw A and a stationary blade A, the stationary blade A is fixed on the outer side of the steam outlet A, and a movable blade A is further arranged on the other side of the stationary blade A; the lower half steam chamber assembly comprises a steam chamber B, a separation rib B and a steam outlet hole B; the lower half stationary blade assembly comprises a fixed seat B, a set screw B and a stationary blade B, the stationary blade B is fixed on the outer side of the steam outlet hole B, and a movable blade B is further arranged on the other side of the stationary blade B; and the steam outlet directions of the upper half steam chamber assembly and the lower half steam chamber assembly are opposite. By adopting the structure of up-down steam inlet and opposite steam outlet directions, the compactness and the space utilization rate of the unit are improved while the condition that the rotor is efficiently pushed by the steam is ensured.

Description

Technical Field

[0001] This invention relates to the field of steam turbine technology, and more specifically to a steam turbine steam chamber structure with two independent chambers. Background Technology

[0002] During steam turbine operation, the steam chamber, as a key component for steam distribution and transmission, directly impacts the turbine's operating efficiency and stability. Industrial production processes involve various steam parameters; fully utilizing these different parameters requires multiple turbine units or cylinder steam inlets. However, traditional steam turbine steam chamber structures are mostly single-chamber designs, making it difficult to simultaneously handle two different steam parameters. When multiple steam parameters are mixed and enter a single chamber, differences in steam pressure, temperature, and other parameters not only significantly increase energy loss but also cause steam flow turbulence, severely weakening the turbine's overall performance.

[0003] While the parallel steam chamber design can address parameter differences to some extent, it inevitably increases the unit's axial length, raises investment costs, compromises structural compactness, and reduces space utilization. Furthermore, this design requires precise matching of steam parameters, limiting its applicability; currently, it is primarily used in specific scenarios such as interstage dehumidification and intermediate reheat. Summary of the Invention

[0004] To address the above problems, this invention proposes a steam turbine steam chamber structure with two independent chambers, the specific technical solution of which is as follows: A steam turbine steam chamber structure with two independent chambers includes an upper steam chamber assembly, a lower steam chamber assembly, an upper stator blade assembly, and a lower stator blade assembly. Steam enters from the upper and lower steam chamber assemblies from the top and bottom, respectively. The upper steam chamber assembly includes a steam chamber A, a baffle A, and a steam outlet A. The baffle A divides the steam chamber A into multiple steam chambers A. The upper stator blade assembly includes a fixed seat A, a set screw A, and stator blades A. The stator blades A are fixed to the outside of the steam outlet A by the fixed seat A and the set screw A. On the other side of the stationary blade A, a moving blade A is also arranged; the lower half steam chamber assembly includes a steam chamber B, a baffle B, and a steam outlet B. The baffle B divides the steam chamber B into multiple steam chambers B; the lower half stationary blade assembly includes a fixed seat B, a set screw B, and a stationary blade B. The stationary blade B is fixed to the outside of the steam outlet B by the fixed seat B and the set screw B. On the other side of the stationary blade B, a moving blade B is also arranged; both the moving blade A and the moving blade B are connected to the turbine rotor. The steam outlet directions of the upper half steam chamber assembly and the lower half steam chamber assembly are opposite.

[0005] Furthermore, an axial locating key and a radial locating key are provided between the upper steam chamber assembly and the lower steam chamber assembly; the upper steam chamber assembly and the lower steam chamber assembly are connected by fastening screws.

[0006] Furthermore, both the upper and lower steam chamber assemblies are equipped with weight reduction chambers.

[0007] Furthermore, a sealing assembly is provided at the interface between the upper steam chamber assembly and the lower steam chamber assembly. The sealing assembly includes a spring plate and a steam seal ring. The spring plate is wave-shaped, and the steam seal ring is a high-low tooth labyrinth type.

[0008] Furthermore, both the fixed base A and the fixed base B are arc-shaped blocks. An adjusting shim A is provided between the fixed base A and the upper steam chamber assembly, and an adjusting shim B is provided between the fixed base B and the lower steam chamber assembly.

[0009] Furthermore, the interface between the upper and lower steam chamber assemblies is provided with mounting grooves for installing sealing components.

[0010] The beneficial effects of this invention are as follows: 1. The structure with steam inlet at the top and bottom and steam outlet in opposite directions ensures efficient steam drive of the rotor. Compared with the parallel steam chamber structure, the axial length is shortened by 20%-30%, which greatly improves the compactness and space utilization of the unit.

[0011] 2. It can make full use of steam of different qualities, improve the overall energy utilization rate, and is suitable for various industrial scenarios such as cogeneration systems and power drives in chemical process industries. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a cross-sectional view of the steam chamber structure of a steam turbine with two independent chambers as described in this invention. Figure 1 ; Figure 2 This is a cross-sectional view of the steam chamber structure of a steam turbine with two independent chambers as described in this invention. Figure 2 ; Figure 3 This is a top view of the steam chamber structure of the steam turbine with two independent chambers as described in this invention; Figure 4 This is a schematic diagram of the upper sealing assembly described in this invention; Figure 5 This is a development view of the upper half stationary blade assembly along the pitch circle according to the present invention; Figure 6 This is a development view of the lower half-stator blade assembly along the pitch circle as described in this invention.

[0014] In the diagram: 1. Upper steam chamber assembly; 101. Steam chamber A; 102. Rib A; 103. Steam outlet A; 104. Weight reduction chamber A; 105. Adjusting shim A; 2. Lower steam chamber assembly; 201. Steam chamber B; 202. Rib B; 203. Locating key; 204. Steam outlet B; 205. Weight reduction chamber B; 206. Adjusting shim B; 207. Fastening screw; 208. Axial locating key; 209. Radial locating key; 3. Upper 4. Lower semi-stationary vane assembly; 301. Fixed seat A; 302. Set screw A; 303. Stationary blade A; 5. Upper semi-sealing assembly; 501. Spring plate A; 502. Steam seal ring A; 6. Lower semi-sealing assembly; 601. Spring plate B; 602. Steam seal ring B; 7. Cylinder; 8. Steam turbine rotor; 9. Moving impeller A; 10. Moving impeller B. Detailed Implementation

[0015] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0016] The present invention provides the following specific implementation schemes: like Figure 1-6As shown, the present invention provides a steam chamber structure for a steam turbine with two independent chambers, including an upper steam chamber assembly 1, a lower steam chamber assembly 2, an upper stator blade assembly 3, and a lower stator blade assembly 4. The upper steam chamber assembly 1 and the lower steam chamber assembly 2 are located on the upper and lower sides of the steam turbine rotor 8, respectively. The upper steam chamber assembly 1 includes a steam chamber A101, a baffle A102, and a steam outlet A103. Steam enters from the upper side and exits from the left side of the steam chamber A101. The baffle A102 separates the steam... Chamber A101 is divided into multiple steam chambers A; the upper half of the stationary vane assembly 3 includes a fixed seat A301, a set screw A302, and a stationary vane A303. The stationary vane A303 is fixed to the outside of the steam outlet A103 by the fixed seat A301 and the set screw A302. A moving vane A is also arranged on the other side of the stationary vane A303; the lower half of the steam chamber assembly 2 includes a steam chamber B201, a baffle B202, and a steam outlet B204. Steam enters from the lower side of the steam chamber B201. From the right side, the baffle B202 divides the steam chamber B201 into multiple steam chambers B; the lower half of the stationary blade assembly 4 includes a fixed seat B401, a set screw B402, and a stationary blade B403. The stationary blade B403 is fixed to the outside of the steam outlet B204 by the fixed seat B401 and the set screw B402. On the other side of the stationary blade B403, there is also a moving blade B. Both the moving blade A and the moving blade B are connected to the turbine rotor 8. The steam outlet directions of the upper half of the steam chamber assembly 1 and the lower half of the steam chamber assembly 2 are opposite. The profiles of the stationary blades A303 and B403 have been optimized by fluid dynamics simulation, which can accurately guide the steam flow direction, so that the steam impacts the corresponding moving blades at the best angle and speed, thereby improving the energy conversion efficiency; after passing through the stationary blade A303, the steam changes from linear motion to rotational motion, and after passing through the stationary blade B403, the steam changes from linear motion to rotational motion, and the rotation direction is consistent with the rotation direction of the steam passing through the stationary blade A303.

[0017] Furthermore, the number of steam chambers A is calculated based on the steam inlet flow rate and can be set to 2-5. In this embodiment, there are 4 chambers to ensure a stable steam flow rate entering the steam chamber and reduce energy loss caused by sudden changes in flow rate. The diameters of the steam outlets A103 and B204 are calculated based on the steam flow rate and pressure parameters, and the orifice walls are smoothed to reduce steam flow resistance and ensure smooth steam passage.

[0018] Furthermore, an axial positioning key 208 and a radial positioning key 209 are provided between the upper steam chamber assembly 1 and the lower steam chamber assembly 2; the upper steam chamber assembly 1 and the lower steam chamber assembly 2 are connected by fastening screws 207; the lower steam chamber assembly 2 is connected to the cylinder 7 by positioning key 203.

[0019] Furthermore, the upper steam chamber assembly 1 is provided with a weight reduction chamber A104, and the lower steam chamber assembly 2 is provided with a weight reduction chamber B205, thereby reducing the weight of the entire device.

[0020] Furthermore, an upper sealing assembly 5 is provided at the interface (i.e., the inner circular surface) of the upper steam chamber assembly 1, including a spring plate A501 and a steam seal ring A502; a lower sealing assembly 6 is provided at the interface (i.e., the inner circular surface) of the lower steam chamber assembly 2, including a spring plate B601 and a steam seal ring B602. Both spring plates A501 and B601 are wavy, and both steam seal rings A502 and B602 are high-low tooth labyrinth type. The surface of the turbine rotor 8 has multiple annular grooves, ensuring that the high and low teeth of the steam seal rings maintain a small gap with the surface of the turbine rotor 8 under the action of their corresponding spring plates. The adjacent teeth of the steam seal rings form a narrow and tortuous steam channel, gradually reducing the steam pressure using the throttling principle, effectively preventing the crossflow of steam with different parameters at the chamber interface and ensuring sealing.

[0021] Furthermore, both the fixed base A301 and the fixed base B401 are arc-shaped blocks. An adjusting shim A105 is provided between the fixed base A301 and the upper half steam chamber assembly 1, and an adjusting shim B206 is provided between the fixed base B401 and the lower half steam chamber assembly 2.

[0022] Furthermore, the upper steam chamber assembly 1 has an installation groove on its interface for installing the upper sealing assembly 5, and the lower steam chamber assembly 2 has an installation groove on its interface for installing the lower sealing assembly 6.

[0023] During operation, steam with different parameters is divided into two streams: one stream enters steam chamber A101 from the upper side of the upper steam chamber assembly 1, and flows evenly into the upper stationary vane assembly 3 through the steam outlet A103. The stationary vanes A303 of the upper stationary vane assembly 3 convert the linear motion of the steam into rotational motion. The other stream enters steam chamber B201 from the upper side of the lower steam chamber assembly 2, and flows evenly into the lower stationary vane assembly 4 through the steam outlet B204. The stationary vanes B403 of the lower stationary vane assembly 4 convert the linear motion of the steam into rotational motion. The steam exiting from the upper stationary vane assembly 3 and the lower stationary vane assembly 4 rotate in the same direction, and the moving vanes are driven by the force to rotate the impeller, thus driving the rotor to rotate. During this process, the steam flow rate of the two streams can be dynamically adjusted by adjusting the steam intake of the upper and lower steam chambers. The upper sealing assembly 5 and the lower sealing assembly 6 effectively prevent steam leakage and mixing, ensuring independent and efficient operation of steam with different parameters.

[0024] Employing a top-and-bottom steam inlet and opposite steam outlet direction structure, this design ensures efficient steam drive of the rotor while reducing the axial length by 20%-30% compared to parallel steam chamber structures, significantly improving the unit's compactness and space utilization. It can fully utilize steam of varying qualities, enhancing overall energy efficiency, and is suitable for diverse industrial applications such as cogeneration systems and power drives in chemical process industries.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A steam turbine steam chamber structure with two independent chambers, characterized in that: It includes an upper steam chamber assembly, a lower steam chamber assembly, an upper stationary vane assembly, and a lower stationary vane assembly, with the upper steam chamber assembly and the lower steam chamber assembly receiving steam from the upper and lower sides, respectively; The upper steam chamber assembly includes a steam chamber A, a baffle A, and a steam outlet A. The baffle A divides the steam chamber A into multiple steam chambers A. The upper stationary blade assembly includes a fixed base A, a set screw A, and a stationary blade A. The stationary blade A is fixed to the outside of the steam outlet A by the fixed base A and the set screw A. A moving blade A is also arranged on the other side of the stationary blade A. The lower steam chamber assembly includes a steam chamber B, a baffle B, and a steam outlet B. The baffle B divides the steam chamber B into multiple steam chambers B. The lower stationary blade assembly includes a fixed base B, a set screw B, and a stationary blade B. The stationary blade B is fixed to the outside of the steam outlet B by the fixed base B and the set screw B. A moving blade B is also arranged on the other side of the stationary blade B. Both moving blade A and moving blade B are connected to the turbine rotor, and the steam outlet directions of the upper steam chamber assembly and the lower steam chamber assembly are opposite.

2. The steam chamber structure of a steam turbine with two independent chambers according to claim 1, characterized in that: An axial locating key and a radial locating key are provided between the upper steam chamber assembly and the lower steam chamber assembly; the upper steam chamber assembly and the lower steam chamber assembly are connected by fastening screws.

3. The steam chamber structure of a steam turbine with two independent chambers according to claim 1, characterized in that: Both the upper and lower steam chamber assemblies are equipped with weight reduction chambers.

4. The steam chamber structure of a steam turbine with two independent chambers according to claim 1, characterized in that: A sealing assembly is provided at the interface between the upper steam chamber assembly and the lower steam chamber assembly. The sealing assembly includes a spring plate and a steam seal ring. The spring plate is wave-shaped, and the steam seal ring is a high-low tooth labyrinth type.

5. The steam chamber structure of a steam turbine with two independent chambers according to claim 1, characterized in that: Both fixed base A and fixed base B are arc-shaped blocks. An adjusting shim A is provided between fixed base A and the upper half steam chamber assembly, and an adjusting shim B is provided between fixed base B and the lower half steam chamber assembly.

6. The steam chamber structure of a steam turbine with two independent chambers according to claim 4, characterized in that: The upper and lower steam chamber assemblies are each provided with a mounting groove for installing sealing components.

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