Steam seal of steam turbine and steam turbine
By installing limit parts on the steam seal block of the turbine and abutting with the steam seal, synchronous clearance measurement of the multi-exhaust steam seal block is achieved, and the problems of low measurement efficiency and large error in the prior art are solved, and the measurement efficiency and accuracy are improved.
Patent Information
- Application Number
- CN202411564596.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-03-11
AI Technical Summary
The measurement efficiency of steam seal gap of existing turbines is low and has large errors. It is mainly because the wooden blocks are not easy to wedge and the wooden blocks are easy to deform, resulting in the steam seal block being abandoned.
A steam seal of the turbine is designed, using a setting hole on the steam seal block and a limiting part is installed. The radial fixation of the steam seal block is achieved through the contact between the limiting part and the steam seal sleeve, allowing multiple exhaust steam seal blocks to perform clearance measurement in synchronization.
The relative fixation between the steam seal block and the steam seal is achieved through the limiting parts, and the gap measurement is carried out simultaneously, saving measurement time, improving efficiency and accuracy, and reducing measurement errors.
Smart Images
Figure CN119593815A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of steam turbine accessories, and more specifically, to a steam turbine steam seal. Background Art
[0002] Measuring the gap between the steam seal and the rotor of a steam turbine is an important process in steam turbine maintenance. Before measuring the gap, the steam seal block needs to be radially positioned to prevent the steam seal block from retreating and causing measurement errors. Currently, radial limiting is achieved by wedging a wooden block between the steam seal block and the steam seal sleeve.
[0003] In the above-mentioned radial limiting of the steam seal block, since multiple rows of steam seal blocks are installed densely, it is difficult for the wooden block to be wedged between the inner steam seal block and the steam seal sleeve. Therefore, it is necessary to measure the gap of the steam seal blocks row by row, resulting in a long measurement time and low measurement efficiency.
[0004] In addition, the wood block is a soft material and is easily squeezed and deformed, which makes the steam seal block easy to give in during the gap measurement process, resulting in a large error in the steam seal gap measurement.
[0005] In summary, how to improve the efficiency of steam seal clearance measurement is a problem that needs to be solved urgently by technical personnel in this field. Summary of the invention
[0006] In view of this, the purpose of the present application is to provide a steam turbine seal to improve the efficiency of steam seal clearance measurement.
[0007] In order to achieve the above objectives, this application provides the following technical solutions:
[0008] A steam turbine steam seal comprises: a steam seal block, a steam seal sleeve and a steam seal spring; wherein the steam seal sleeve is externally disposed on the steam seal block, and the steam seal block and the steam seal sleeve are movably connected via the steam seal spring; the steam seal block is provided with a positioning hole, wherein one axial end of the positioning hole is close to the steam seal sleeve, and the other axial end of the positioning hole is away from the steam seal sleeve, and the positioning hole is used for installing a limiting member, and the steam seal block can be relatively fixed in the axial direction of the positioning hole via the limiting member and the steam seal sleeve.
[0009] In some embodiments, the steam seal block is arc-shaped, and the axial direction of the positioning holes is distributed along the radial direction of the steam seal block.
[0010] In some embodiments, the limit member is also included; wherein, the limit member has a first state and a second state, and the limit member includes a first end close to the steam seal sleeve and a second end away from the steam seal sleeve; in the first state, the first end of the limit member and the second end of the limit member are both located inside the positioning hole; in the second state, the first end of the limit member abuts against the steam seal sleeve, and the second end of the limit member is located inside the positioning hole.
[0011] In some embodiments, the positioning hole is a threaded hole, and the limiting member is threadably matched with the threaded hole.
[0012] In some embodiments, the limiting member is a hexagon socket bolt.
[0013] In some embodiments, the steam seal block has steam seal teeth, a gap is provided between two adjacent steam seal teeth, and the positioning hole is located in the gap.
[0014] In some embodiments, there are at least two positioning holes, and the limiting members correspond one-to-one to the positioning holes.
[0015] In some embodiments, there are two positioning holes, and the positioning holes are distributed at opposite corners of the steam sealing block, or the positioning holes are distributed at both ends of the steam sealing block.
[0016] In some embodiments, there are four positioning holes, and the positioning holes are distributed at four corners of the steam seal block.
[0017] A steam turbine comprises the steam turbine seal as described above.
[0018] In the steam seal of the steam turbine provided by the present application, the steam seal sleeve is outermost of the steam seal block, and the steam seal block and the steam seal sleeve are movably connected by a steam seal spring. The steam seal block is provided with a positioning hole for installing a limiting member, and the positioning hole has one end close to the steam seal sleeve in its axial direction and the other end away from the steam seal sleeve, so that the limiting member can move from the first side of the steam seal block close to the rotor to the second side of the steam seal block close to the steam seal sleeve and abut against the steam seal sleeve, so that the steam seal block can be relatively fixed with the steam seal sleeve in the axial direction of the positioning hole through the limiting member, so that multiple rows of steam seal blocks and the steam seal sleeve can be relatively fixed in the axial direction of the positioning hole at the same time, so that multiple rows of steam seal blocks can be simultaneously measured for clearance, which saves measurement time and improves measurement efficiency; and, since the steam seal sleeve and the steam seal block can be relatively fixed in the axial direction of the positioning hole, the stability of the clearance between the steam seal block and the rotor is ensured, the measurement error in the clearance measurement is reduced, and the measurement accuracy is improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0020] Figure 1 A schematic diagram of a steam seal of a steam seal machine provided in an embodiment of the present application;
[0021] Figure 2 A schematic diagram of the steam seal distribution provided in an embodiment of the present application.
[0022] Description of reference numerals:
[0023] 1-rotor, 2-steam seal block, 20-steam seal tooth, 3-steam seal sleeve, 4-steam seal spring, 5-positioning hole, 6-limiting piece. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be used as limitations on the present application. As used in the specification and appended claims of the present application, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear indication to the contrary in the context.
[0026] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.
[0027] The steam seal can reduce the steam leakage loss at the blade tip and blade root of the moving and stationary blade channels inside the steam turbine, and improve the thermal energy conversion efficiency of the steam turbine. The steam seal of the steam turbine is usually composed of 3 to 5 groups of steam seal blocks of the same model. A certain steam seal gap is left between the steam seal block and the rotor to prevent dynamic and static friction. A steam seal spring is installed on the back of the steam seal block. When the rotor position changes and contacts the steam seal block, the steam seal block retreats to prevent the steam seal teeth from wearing. When the rotor returns to the working position, the steam seal block returns to the working position under the action of the steam seal spring, keeping the steam seal gap between the steam seal block and the rotor within the design range.
[0028] Measuring the gap between the steam seal block and the rotor is an important process in the maintenance of steam turbines. Before measuring the steam seal gap, the steam seal block needs to be radially positioned, and the radial direction is the radial direction of the rotor to prevent the steam seal block from retreating and causing measurement errors. Currently, radial limiting is achieved by wedging a wooden block between the steam seal block and the steam seal sleeve. However, due to the dense installation between multiple rows of steam seal blocks, it is difficult for the wooden block to be wedged between the steam seal block on the inner side and the steam seal sleeve. Therefore, it is necessary to measure the gap of the steam seal block row by row, resulting in a long measurement time; in addition, the wooden block is a soft material and is prone to extrusion and deformation, which makes the steam seal block easy to retreat during the gap measurement process, resulting in a large error in the measurement of the steam seal gap.
[0029] In order to solve the above technical problems, the present application provides a steam turbine steam seal to improve the efficiency of steam seal clearance measurement and reduce the error of steam seal clearance measurement.
[0030] like Figure 1 As shown, the steam seal of the steam turbine provided in the embodiment of the present application includes: a steam seal block 2, a steam seal sleeve 3 and a steam seal spring 4. The steam seal sleeve 3 is placed outside the steam seal block 2, and the steam seal block 2 and the steam seal sleeve 3 are movably connected through the steam seal spring 4, so that when the rotor contacts the steam seal block 2, the steam seal block 2 can compress the steam seal spring 4, so that the steam seal block 2 retreats toward the steam seal sleeve 3, and the steam seal teeth 20 on the steam seal block 2 are prevented from being worn.
[0031] The steam seal block 2 is provided with a positioning hole 5 for installing a limiting member 6, and the positioning hole 5 is a through hole, one end of the positioning hole 5 in the axial direction is close to the steam seal sleeve 3, and the other end in the axial direction is away from the steam seal sleeve 3 and close to the rotor. In this way, the limiting member 6 can be installed into the interior of the positioning hole 5 from the end of the positioning hole 5 close to the rotor, and the limiting member 6 can be moved along the positioning hole 5 toward the steam seal sleeve 3. When the limiting member 6 abuts against the steam seal sleeve 3, the steam seal block 2 and the steam seal sleeve 3 can be relatively fixed in the axial direction of the positioning hole 5.
[0032] It should be noted that if Figure 2As shown, the steam seal block 2 is arc-shaped, so the steam seal block 2 can be relatively fixed in the radial direction of the steam seal block 2 through the stopper 6 and the steam seal sleeve 3. In this way, since the stopper 6 can be installed with the positioning hole 5 and abut against the steam seal sleeve 3, it is no longer necessary to wedge into the gap between the steam seal block 2 and the steam seal sleeve 3 to achieve radial fixation of the steam seal block 2, so that multiple rows of steam seal blocks 2 can be relatively fixed with the steam seal sleeve 3 in the radial direction at the same time, so that the gaps of multiple rows of steam seal blocks 2 can be measured synchronously, which saves measurement time and improves measurement efficiency.
[0033] Furthermore, since the stopper 6 can achieve relative fixation between the steam seal block 2 and the steam seal sleeve 3 in radial direction, the stability of the gap between the steam seal block 2 and the rotor is ensured, the measurement error in the gap measurement is reduced, and the measurement accuracy is improved.
[0034] The limiting member 6 may be made of a rigid material, such as hard metal, hard alloy, etc., which is not limited in the embodiment of the present application.
[0035] In some embodiments, Figure 1 As shown, the axial direction of the positioning hole 5 is distributed along the radial direction of the steam seal block 2, so that the axial force of the limiter 6 is consistent with the radial force of the steam seal block 2, thereby improving the support stability of the limiter 6 and further reducing the gap measurement error.
[0036] In some other embodiments, the axial direction of the positioning hole 5 and the radial direction of the steam seal block 2 form an angle, which reduces the machining accuracy of the positioning hole 5 and saves machining time.
[0037] In some embodiments, Figure 1 As shown, the steam seal also includes a limiter 6, which includes a first end close to the steam seal sleeve 3 and a second end away from the steam seal sleeve 3, and the limiter 6 has a first state and a second state. In the first state, the first end of the limiter 6 and the second end of the limiter 6 are both located inside the positioning hole 5, and the limiter 6 is fixed in the positioning hole to ensure that the limiter 6 does not affect the normal operation of the steam seal block 2; in the second state, when the steam seal block 2 needs to be radially limited, the first end of the limiter 6 abuts against the steam seal sleeve 3, the second end of the limiter 6 is located inside the positioning hole, and the limiter 6 is fixed to the positioning hole to ensure that the limiter 6 is fixed in its axial direction, so as to achieve radial limiting of the steam seal block 2.
[0038] In some other embodiments, the steam seal does not include the limit member 6. When the steam seal block 2 needs to be radially limited, the limit member 6 can be installed into the positioning hole 5 and fixed to the positioning hole 5, and the radial limitation of the steam seal block 2 can be achieved by abutting against the steam seal sleeve 3. After the measurement is completed, the limit member 6 can be taken out through the positioning hole 5 so that the limit member 6 will not affect the normal operation of the steam seal block 2.
[0039] In some embodiments, the positioning hole 5 is a threaded hole, and the limit member 6 can cooperate with the threaded hole. In order to facilitate the operation of the limit member 6, the limit member 6 is a hexagon socket bolt. In this way, by rotating the hexagon socket bolt, the hexagon socket bolt is abutted against the steam seal sleeve 3 at one end, and the other end is still threadedly connected to the threaded hole, so as to achieve radial relative fixation between the steam seal block 2 and the steam seal sleeve 3, reduce measurement errors, make operation more convenient, and further improve the efficiency of gap measurement.
[0040] like Figure 1 As shown, the steam seal block 2 has steam seal teeth 20, and there is a gap between two adjacent steam seal teeth 20, and the positioning hole 5 is located in the gap between the steam seal teeth 20. In this way, the positioning hole is set by utilizing the original gap between the steam seal teeth 20, which ensures the structural strength of the steam seal teeth 20 and the normal operation of the steam seal block 2.
[0041] In order to ensure that the limit member 6 can provide a stable supporting force, the steam seal block 2 is provided with at least two positioning holes 5, and the limit members 6 correspond to the positioning holes 5 one by one, and at least two limit members 6 abut against the steam seal sleeve 3, thereby ensuring the fixation of the gap between the rotor and the steam seal block 2 during the gap measurement process, and further reducing the measurement error.
[0042] In some embodiments, there are two positioning holes 5, and the two positioning holes 5 are distributed at the diagonals of the steam sealing block 2, or the two positioning holes 5 are distributed at both ends of the steam sealing block 2, which reduces the processing steps of the steam sealing block 2, saves the operation time of the adjustment part 6, and further improves the efficiency of the gap measurement.
[0043] In some other embodiments, there are four positioning holes 5, which are distributed at the four corners of the steam seal block 2, so that the four limit members 6 can respectively abut against the steam seal sleeve 3, thereby improving the supporting strength of the limit members 6, ensuring the balanced force of the limit members 6, and further reducing the measurement error.
[0044] Before measuring the gap of the steam seal of the steam turbine provided in the embodiment of the present application, the rotor is first moved out, and then the limit members 6 of each steam seal block 2 are rotated respectively so that each limit member 6 abuts against the steam seal sleeve 3, and then the rotor is moved back to its original position for gap measurement, thereby realizing radial limitation of multiple steam seal blocks 2, and being able to perform gap measurement on multiple rows of steam seal blocks 2 at the same time, saving measurement time, improving measurement efficiency, and ensuring measurement accuracy. After the measurement is completed, the limit member 6 is rotated into the interior of the positioning hole 5, or the positioning member 6 is unscrewed so that the positioning member 6 is separated from the steam seal block 2, so that the steam seal block 2 resumes normal operation.
[0045] An embodiment of the present application also provides a steam turbine, which includes the steam turbine steam seal in the above embodiment.
[0046] like Figure 2As shown, the steam seal of the steam turbine is usually composed of 3-5 groups of steam seal groups of the same model. Each group of steam seal groups is closely distributed in sequence along the axial direction of the rotor, and each group of steam seal groups includes 3-5 steam seal blocks 2 in sequence along the circumferential direction of the rotor. Each steam seal block 2 is closely distributed to ensure the steam sealing of the blade tops and blade roots of the dynamic and stationary blade channels inside the steam turbine.
[0047] Since the above-mentioned steam turbine seal has the above-mentioned technical effects, and the above-mentioned steam turbine includes the above-mentioned steam turbine seal, the above-mentioned steam turbine also has the corresponding technical effects, which will not be repeated here.
[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. 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 application. Therefore, the present application 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 seal, characterized in that: include: Steam seal block (2), steam seal sleeve (3) and steam seal spring (4); Wherein, the steam seal sleeve (3) is externally mounted on the steam seal block (2), and the steam seal block (2) and the steam seal sleeve (3) are movably connected via the steam seal spring (4); The steam seal block (2) is provided with a positioning hole (5), one end of the positioning hole (5) in the axial direction is close to the steam seal sleeve (3), and the other end of the positioning hole (5) in the axial direction is away from the steam seal sleeve (3). The positioning hole (5) is used to install a limiting member (6), and the steam seal block (2) can be relatively fixed in the axial direction of the positioning hole (5) through the limiting member (6) and the steam seal sleeve (3).
2. The steam turbine seal according to claim 1, characterized in that: The steam seal block (2) is arc-shaped, and the axial direction of the positioning holes (5) is distributed along the radial direction of the steam seal block (2).
3. The steam turbine seal according to claim 1, characterized in that: Also includes the limiting member (6); The limiting member (6) has a first state and a second state, and the limiting member (6) comprises a first end close to the steam seal sleeve (3) and a second end away from the steam seal sleeve (3); In the first state, the first end of the limiting member (6) and the second end of the limiting member (6) are both located inside the positioning hole (5); In the second state, the first end of the limiting member (6) abuts against the steam seal sleeve (3), and the second end of the limiting member (6) is located inside the positioning hole (5).
4. The steam turbine seal according to claim 1, characterized in that: The positioning hole (5) is a threaded hole, and the limiting member (6) is threadably matched with the threaded hole.
5. The steam turbine seal according to claim 4, characterized in that: The limiting member (6) is a hexagon socket bolt.
6. The steam turbine seal according to claim 1, characterized in that: The steam seal block (2) has steam seal teeth (20), a gap is provided between two adjacent steam seal teeth (20), and the positioning hole (5) is located in the gap.
7. The steam turbine seal according to any one of claims 1 to 6, characterized in that: There are at least two positioning holes (5), and the limiting members (6) correspond one to one with the positioning holes (5).
8. The steam turbine seal according to claim 7, characterized in that: There are two positioning holes (5), and the positioning holes (5) are distributed at opposite corners of the steam sealing block (2), or the positioning holes (5) are distributed at both ends of the steam sealing block (2).
9. The steam turbine seal according to claim 7, characterized in that: There are four positioning holes (5), and the positioning holes (5) are distributed at the four corners of the steam seal block (2).
10. A steam turbine, characterized in that: Comprising a steam turbine steam seal as claimed in any one of claims 1 to 9.