Multi-stage partition plate assembly of steam turbine

Abstract

The utility model provides a steam turbine multi-stage partition plate assembly, which relates to the field of steam turbine partition plates, and adopts the technical scheme that the steam turbine multi-stage partition plate assembly comprises a plurality of original partition plates and a plurality of newly-added partition plates, and the newly-added partition plates are detachably connected with the corresponding original partition plates. When the steam turbine is transformed, the newly-added partition plate can be directly installed on the original partition plate, an original unit cylinder does not need to be returned to a factory for transformation, the workload of steam turbine transformation is greatly reduced, and meanwhile the problem that the newly-added partition plate has no installation space on the cylinder wall is solved.

Description

Technical Field

[0001] The utility model relates to the field of steam turbine partitions, in particular to a steam turbine multi-stage partition assembly. Background Art

[0002] As an important component of the turbine stator, the turbine diaphragm is a circular plate-shaped component installed in the turbine cylinder and divides the cylinder into multiple chambers with different pressures. Its main function is to install nozzles or stationary blades and prevent inter-stage steam leakage. When the steam working medium flows through the nozzle installed on the diaphragm, the potential energy is converted into kinetic energy, the pressure is reduced, the speed is increased, and then it enters the moving blades to do work. The diaphragm is installed in the groove on the inner wall of the cylinder, generally divided into upper and lower halves, straddling the rotating shaft, and the rotating shaft passes through its center.

[0003] The assembly structure of the partition needs to enable the partition to be installed as a whole with the other parts of the stator and to maintain the correct position when the turbine is running; usually, the partition is installed in the annular groove of the cylinder or the partition sleeve, and the annular groove is used to keep the partition in the correct axial position. A bottom key is provided at the bottom of the partition to prevent the partition from rotating in the circumferential direction and moving in the horizontal direction perpendicular to the axial direction. A pressure plate is provided at the center dividing surface of the cylinder or the upper half of the partition sleeve so that the upper half of the partition can be installed in the cylinder or the upper half of the partition sleeve.

[0004] In the steam turbine reconstruction, it is necessary to utilize the cylinders of the original unit and increase the number of partitions. On the one hand, the cylinders need to be shipped back to the manufacturer for processing to ensure that the corresponding number and size of partitions can be installed, and then shipped back to the power plant for reconstruction, which is a large workload. On the other hand, due to space limitations on the cylinder walls of some cylinders, it is impossible to process the corresponding partition installation grooves, which makes steam turbine reconstruction difficult. Utility Model Content

[0005] In order to solve the technical problem in the above-mentioned prior art that it is inconvenient to install multi-stage partitions when modifying the steam turbine, the utility model provides a steam turbine multi-stage partition assembly that can be directly installed without returning the original unit cylinder to the factory for modification, greatly reducing the workload of steam turbine modification and solving the problem of no installation space for the newly added partition on the cylinder wall.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a multi-stage baffle assembly of a steam turbine, including a plurality of original baffles and a plurality of newly added baffles, wherein the newly added baffles are detachably connected to the corresponding original baffles. By directly arranging the newly added baffles on the original baffles, it is avoided that the cylinder of the original unit needs to be returned to the factory for transformation, which greatly reduces the workload of the steam turbine transformation, and at the same time solves the problem that there is no installation space for the newly added baffles on the cylinder wall.

[0007] Furthermore, the original partition and the newly added partition are axially connected by screws, and the tightening force of the screws is used to achieve accurate axial positioning of the newly added partition.

[0008] Furthermore, a positioning pin is axially arranged between the original partition and the connected newly added partition, so as to prevent the newly added partition and the original partition from being misaligned in the circumferential direction.

[0009] Furthermore, the positioning pin is loosely matched with the corresponding pin holes on the newly added partition and the original partition, and a screw plug is axially arranged at the end of the positioning pin to prevent the positioning pin from falling off.

[0010] Furthermore, the newly added partitions on the two adjacent original partitions are located at different ends, and the front end of the original partition with higher pressure is provided with the newly added partition. On the one hand, the installation space of the newly added partition can be guaranteed, and on the other hand, the influence of steam on the connection strength between the newly added partition and the original partition can be reduced.

[0011] Further, the connection end surface of the original partition is provided with a positioning boss, and the corresponding connection end surface of the newly added partition is provided with a positioning flange, and the positioning flange and the positioning boss are in clearance fit; and / or, the connection end surface of the original partition is provided with a positioning flange, and the corresponding connection end surface of the newly added partition is provided with a positioning boss, and the positioning flange and the positioning boss are in clearance fit. By providing the positioning flange and the positioning boss, the newly added partition can be accurately positioned in a plane perpendicular to the axial direction.

[0012] It can be seen from the above technical solutions that the utility model has the following advantages:

[0013] The utility model provides a steam turbine multi-stage partition assembly, which avoids the need to return the original unit cylinder to the factory for modification by directly arranging a new partition on the original partition, greatly reduces the workload of steam turbine modification, and solves the problem of lack of installation space for the new partition on the cylinder wall; accurate axial positioning of the new partition is achieved by screws, and accurate positioning of the new partition in a plane perpendicular to the axial direction is achieved by arranging a positioning flange and a positioning boss; circumferential dislocation of the new partition and the original partition is prevented by a positioning pin; and falling off of the positioning pin is prevented by arranging a screw plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 This is a schematic diagram of the structure in which a new partition is arranged in front of the original partition in a specific embodiment of the utility model. Figure 1 .

[0016] Figure 2 This is a schematic diagram of the structure in which a new partition is arranged in front of the original partition in a specific embodiment of the utility model. Figure 2 .

[0017] Figure 3 This is a structural schematic diagram of a specific implementation manner of the utility model in which a newly added partition is arranged at the rear of the original partition.

[0018] Figure 4 It is a schematic diagram of the assembly structure of a specific implementation method of the utility model and a cylinder.

[0019] In the figure, 1, cylinder; 2, original partition; 3, newly added partition; 4, screw; 5, positioning pin; 6, screw plug; 7, positioning flange; 8, positioning boss. DETAILED DESCRIPTION

[0020] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0021] like Figures 1 to 3 As shown, this specific embodiment provides a steam turbine multi-stage partition assembly, including a plurality of original partitions 2 and a plurality of newly added partitions 3, the newly added partitions 3 are detachably connected to the corresponding original partitions 2, and in this specific embodiment, one newly added partition 3 is arranged on one original partition 2. By directly arranging the newly added partition 3 on the original partition 2, it is avoided that the original unit cylinder 1 is returned to the factory for modification, which greatly reduces the workload of the steam turbine modification, and at the same time solves the problem that there is no installation space for the newly added partition 3 on the wall of the cylinder 1.

[0022] like Figure 2 As shown, in this specific embodiment, in order to facilitate the installation of the newly added partition 3, the original partition 2 and the newly added partition 3 are axially connected by screws 4, and the tightening force of the screws 4 is used to achieve accurate axial positioning of the newly added partition 3. The specifications and quantity of the screws 4 are selected after calculating the weight of the partition and the steam force it is subjected to; at the same time, since the newly added partition 3 has a tendency to rotate circumferentially, and the screws 4 cannot be positioned circumferentially, for this reason, a positioning pin 5 is also axially arranged between the original partition 2 and the connected newly added partition 3, and the positioning pin 5 is matched with the corresponding pin hole clearance on the newly added partition 3 and the original partition 2, and a screw plug 6 is axially arranged on the end of the positioning pin 5.

[0023] like Figure 4As shown, since the newly added partition 3 and the original partition 2 are connected only by screws 3, it is necessary to reduce the axial force of the steam on the screws 3 as much as possible during the flow. Therefore, in combination with the installation space, the newly added partitions 3 on the two adjacent original partitions 2 are respectively located at different ends, and among the two adjacent original partitions 2, the front end of the original partition 2 with higher pressure is provided with the newly added partition 3. In this way, not only the installation space is reasonably utilized, but also it is ensured that the newly added partition 3 installed at the rear end of the original partition 2 is located in a lower pressure area, and the connection strength of the screws 4 meets the connection requirements of the two in the low-pressure area, and in the high-pressure area, the newly added partition 3 is pressed tightly against the original partition 2 under the action of steam, thereby strengthening the connection strength between the two.

[0024] like Figures 1 to 3 As shown, in this specific embodiment, in order to realize the positioning of the newly added partition 3 in a plane perpendicular to the axial direction, when the newly added partition 3 is provided at the front of the original partition 2, a positioning boss 8 is provided on the corresponding connecting end surface of the original partition 2, and a positioning flange 7 is provided on the corresponding connecting end surface of the newly added partition 3. The positioning flange 7 and the positioning boss 8 are clearance-matched, and the screw plug 6 is threadedly connected with the pin hole on the newly added partition 3. Correspondingly, a countersunk hole is provided on the newly added partition 3, and a blind hole is provided on the original partition 2. The head of the screw 4 is in close contact with the corresponding end surface of the newly added partition 3, and the newly added partition 3 The pin hole on the original partition 2 is a through hole, and the pin hole on the original partition 2 is a blind hole; when a new partition 3 is provided at the rear of the original partition 2, a positioning flange 7 is provided on the corresponding connecting end face of the original partition 2, and a positioning boss 8 is provided on the corresponding connecting end face of the new partition 3. The positioning flange 7 and the positioning boss 8 are clearance-matched. When the screw 4 is used for connection, a blind hole is provided on the new partition 3, and a countersunk hole is provided on the original partition 2. At the same time, the pin hole on the original partition 2 is a through hole, and the pin hole on the new partition 3 is a blind hole. The screw plug 6 abutting against the end of the positioning pin 5 is threadedly connected to the pin hole of the original partition 2.

[0025] From the above specific implementations, it can be seen that the utility model has the following beneficial effects:

[0026] 1. By directly installing a new partition 3 on the original partition 2, the original unit cylinder is prevented from being returned to the factory for modification, which greatly reduces the workload of steam turbine modification and solves the problem of no installation space for the new partition 3 on the cylinder wall;

[0027] 2. Accurately position the newly added partition 3 in the axial direction by setting screws;

[0028] 3. By providing the positioning flange 7 and the positioning boss 8, the newly added partition 3 can be accurately positioned in a plane perpendicular to the axial direction;

[0029] 4. Prevent the newly added partition 3 and the original partition 2 from being misaligned in the circumferential direction by using the positioning pin 5;

[0030] 5. Prevent the positioning pin 5 from falling off by setting a screw plug 6.

[0031] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steam turbine multi-stage baffle assembly, comprising a plurality of original baffles (2) and a plurality of newly added baffles (3), characterized in that: The newly added partition (3) is detachably connected to the corresponding original partition (2); the newly added partitions (3) on two adjacent original partitions (2) are respectively located at different ends; and, among the two adjacent original partitions (2), the front end of the original partition (2) with higher pressure is provided with the newly added partition (3).

2. The multi-stage diaphragm assembly of a steam turbine according to claim 1, characterized in that: The original partition plate (2) and the newly added partition plate (3) are axially connected via screws (4).

3. The multi-stage diaphragm assembly of a steam turbine according to claim 2, characterized in that: A positioning pin (5) is also axially arranged between the original partition plate (2) and the newly added partition plate (3) connected thereto.

4. The multi-stage diaphragm assembly of a steam turbine according to claim 3, characterized in that: The positioning pin (5) is clearance-matched with corresponding pin holes on the newly added partition (3) and the original partition (2), and a screw plug (6) is axially arranged at the end of the positioning pin (5).

5. The multi-stage diaphragm assembly of a steam turbine according to claim 3, characterized in that: A positioning boss (8) is provided on the connection end surface of the original partition (2), and a positioning flange (7) is provided on the connection end surface of the corresponding newly added partition (3), and the positioning flange (7) and the positioning boss (8) are clearance-matched; and / or, a positioning flange (7) is provided on the connection end surface of the original partition (2), and a positioning boss (8) is provided on the connection end surface of the corresponding newly added partition (3), and the positioning flange (7) and the positioning boss (8) are clearance-matched.

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