Stationary blade segment with sealing structure

Abstract

The utility model relates to a stationary blade fan-shaped section with a sealing structure. The stationary blade fan-shaped section with the sealing structure comprises a first fan-shaped section, wherein one side of the top of the first fan-shaped section extends outwards in the circumferential direction to form a first lap joint part; one side of the bottom of the second fan-shaped section extends outwards in the circumferential direction to form a second lap joint part; the bottom face of the first lap joint part and the top face of the second lap joint part are matched in an up-down lap joint mode, an outer side gap is formed between the top of the first fan-shaped section and the top of the second fan-shaped section, and an inner side gap is formed between the bottom of the first fan-shaped section and the bottom of the second fan-shaped section. The utility model provides a stationary blade fan-shaped section with a sealing structure. The stationary blade fan-shaped section with the sealing structure can effectively reduce air flow leakage.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of aero-engine, especially to a stator segment with sealing structure. BACKGROUND

[0002] In the structure system of aero-engine, the common structure of compressor stator casing is mainly divided into two types of half split casing and whole ring casing. For the adjustable stator blades that need to be adjusted in angle, the corresponding casing usually adopts split structure, which is convenient for assembly. For the stator segments that do not need to be adjusted in angle, the whole ring casing becomes a common matching, which can provide a more stable support environment for the stator and ensure its stable operation.

[0003] Figure 1A The structure diagram of the whole ring casing of aero-engine in prior art is shown. Figure 1B is Figure 1A The local enlarged view of the stator segment in the figure. As shown in the figure, the multi-stage whole ring casing includes a front stage casing 101 and a rear stage casing 102, which are connected by bolts, and the adjacent two stage casings form the mounting structure of the stator segment 103. The rotor 104 and the stator component such as the stator segment 103 form a dynamic and static cooperation relationship, the rotation of the rotor 104 and the fixed structure of the stator component interact with each other to complete the work process such as gas compression. Among them, the stator segment 103 is usually designed as 8-12 segments per week. In order to effectively cope with the deformation difference between the casing and the stator segment 103 in the hot state operation process, a certain gap 105 is intentionally reserved between every two stator segments 103. Under the most severe working condition, the circumferential deformation of the stator segment 103 will be greater than that of the casing. At this time, the reserved gap 105 can just fill the difference between the deformation of the two, so as to avoid the problem of structural interference caused by inconsistent thermal deformation and ensure the safe and stable operation of the engine.

[0004] However, this gap design scheme has unavoidable disadvantages in actual application. On the one hand, limited by factors such as machining precision, assembly process and material characteristics, the design of the gap 105 is difficult to accurately reach the ideal state, which lays hidden dangers for subsequent operation; on the other hand, during the entire service life of the engine, most of the time is not under the most severe working condition, and the existence of the gap 105 will cause the leakage of airflow, which will have a negative impact on the working efficiency of the compressor and weaken the overall performance of the engine. UTILITY MODEL CONTENTS

[0005] In view of the above problems of the prior art, the utility model provides a stator segment with sealing structure, which can effectively reduce the leakage of airflow.

[0006] Specifically, the utility model provides a static vane fan segment with sealing structure, include:

[0007] The first fan segment, one side of the top portion extends outward along the circumference and forms a first lap joint portion;

[0008] The second fan segment, one side of the bottom portion extends outward along the circumference and forms a second lap joint portion;

[0009] The bottom surface of the first lap joint portion and the top surface of the second lap joint portion are in upper and lower lap joint cooperation, an outside gap is formed between the top portions of the first fan segment and the second fan segment, and an inside gap is formed between the bottom portions of the first fan segment and the second fan segment.

[0010] According to one embodiment of the utility model, the bottom surface of the first lap joint portion is provided with a groove along the circumference, and the groove is in communication with the inside gap.

[0011] According to one embodiment of the utility model, the cross section of the groove is arc-shaped.

[0012] According to one embodiment of the utility model, the center of the groove is located on the radial outside of the lap joint surface formed by the first lap joint portion and the second lap joint portion.

[0013] According to one embodiment of the utility model, the distal end of the second lap joint portion forms a chamfer, and the chamfer and the groove structure cooperate to form a spiral structure, so that the leaked gas enters the groove along the inside gap and flows back into the inside gap along the chamfer.

[0014] According to one embodiment of the utility model, the static vane fan segment further includes a sealing ring, and the sealing ring is arranged between the first lap joint portion and the second lap joint portion.

[0015] According to one embodiment of the utility model, the sealing ring is a C-shaped sealing ring.

[0016] According to one embodiment of the utility model, the sealing ring is made of a damping energy-absorbing material.

[0017] According to one embodiment of the utility model, the damping energy-absorbing material is a metal material.

[0018] The static vane fan segment with sealing structure provided by the utility model forms a sealing structure through the lap joint cooperation of the first lap joint portion of the first fan segment and the second lap joint portion of the second fan segment, thereby effectively reducing airflow leakage.

[0019] It should be understood that the above general description and the following detailed description of the utility model are exemplary and illustrative, and are intended to provide further explanation of the described utility model. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the principle of the present application. In the drawings:

[0021] Figure 1A Fig. 1 shows a structural schematic diagram of an aero-engine whole ring casing in the prior art.

[0022] Figure 1B Fig. 2 is a partial enlarged view of a stator sector in Fig. 1. Figure 1A

[0023] Figure 2A Fig. 3 shows a structural schematic diagram of a stator sector with a sealing structure in an embodiment of the present application.

[0024] Figure 2B Fig. 4 is a structural schematic diagram of a first sector in Fig. 3. Figure 2A

[0025] Figure 2C Fig. 5 is a structural schematic diagram of a second sector in Fig. 3. Figure 2A

[0026] Figure 3 Fig. 6 shows a structural schematic diagram of a sealing structure of a stator sector in an embodiment of the present application.

[0027] In the above drawings, the following reference signs are used:

[0028] Front stage casing 101

[0029] Rear stage casing 102

[0030] Stator sector 103

[0031] Rotor 104

[0032] Gap 105

[0033] Stator sector 200

[0034] First sector 210

[0035] First lap joint 211

[0036] Groove 212

[0037] Second sector 220

[0038] Second lap joint 221

[0039] Chamfer 222

[0040] Outer gap 230 ​​​

[0041] Inner side gap 231

[0042] Sealing ring 240 DETAILED DESCRIPTION

[0043] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict.

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the present application.

[0045] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0046] Unless specifically stated otherwise, the relative arrangements of the components and steps illustrated in these embodiments and the numerical expressions and values set forth herein are not limiting of the scope of the present application. It should be understood that the various parts of the drawings are not necessarily drawn to scale, and that, for the purpose of convenience and clarity, not all components can be shown in a given figure. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail, but are intended to be part of the scope of the present application. In all examples shown and discussed herein, any specific values should be interpreted as merely illustrative and not as a limitation on the scope of the exemplary embodiments. Thus, other examples of the exemplary embodiments can have different values. It should be noted that like reference numerals and letters refer to like items in the drawings, and thus, once an item is defined in one drawing, it need not be discussed further in subsequent drawings.

[0047] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, without making the opposite statement, these orientation words do not indicate and imply that the device or element indicated must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0048] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawing is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned 90 degrees or in other orientations in other different ways, and the spatial relative description used herein is interpreted accordingly.

[0049] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the present application. In addition, although the terms used in the present application are selected from well-known and commonly used terms, some terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and the detailed meaning of each term is described in the relevant part of the description. In addition, the present application is required to be understood not only by the actual terms used, but also by the meaning implied by each term.

[0050] Figure 2A The structure diagram of the stator vane sector with sealing structure in one embodiment of the present application is shown. Figure 2B Figure 2A The structure diagram of the first sector in the stator vane sector with sealing structure is shown. Figure 2C Figure 2A The structure diagram of the second sector in the stator vane sector with sealing structure is shown. As shown in the figure, the stator vane sector with sealing structure 200 mainly comprises a first sector 210 and a second sector 220.

[0051] ​​The first lap joint part 211 is formed by extending outward along the circumference on one side of the top of the first sector segment 210.

[0052] The second lap joint part 221 is formed by extending outward along the circumference on one side of the bottom of the second sector segment 220.

[0053] The bottom surface of the first lap joint part 211 and the top surface of the second lap joint part 221 are in up-down lap joint cooperation. The outer side gap 230 is formed between the top of the first sector segment 210 and the top of the second sector segment 220, and the inner side gap 231 is formed between the bottom of the first sector segment 210 and the bottom of the second sector segment 220.

[0054] The bottom surface of the first lap joint part 211 and the top surface of the second lap joint part 221 are in up-down lap joint cooperation, which can reduce the leakage of airflow between the two sector segments to a certain extent, thereby improving the sealing performance. The outer side gap 230 and the inner side gap 231 reserve deformation space for thermal expansion, avoiding the interference problem between the stator blade sector segment 200 and the casing structure. The stator blade sector segment 200 with the sealing structure is designed to achieve good sealing effect through specific lap joint cooperation and reasonable setting and processing of the gap, while considering the stability and adaptability of the structure to meet the requirements of airflow control and sealing.

[0055] Figure 3 The structure diagram of the sealing structure of the stator blade sector segment in one embodiment of the utility model is shown. As shown in the figure, in some examples, the bottom surface of the first lap joint part 211 is provided with a groove 212 along the circumference, and the groove 212 is in communication with the inner side gap 231. The groove 212 gives the possibility of gas rotation. When the gas flows through the inner side gap 231, the airflow can enter the groove 212 through the inner side gap 231 due to the communication of the groove 212, and the annular trend of the groove 212 guides the gas to rotate, so that the gas makes rotational motion along the groove 212. The rotational airflow can form a dynamic air curtain in the local area of the groove 212 and the inner side gap 231. The high-speed rotating gas will generate a certain centrifugal force, so that the external airflow is difficult to break through the air curtain to enter the lap joint surface of the first lap joint part 211 and the second lap joint part 221, thereby reducing the gas leakage and strengthening the sealing performance of the stator blade sector segment 200, so that the operating efficiency of the whole system can be maintained at a high level.

[0056] In some examples, the cross section of the groove 212 is arc-shaped, which can further reduce the resistance of the gas flowing in the groove 212. When the airflow flows into the groove 212 along the communicated inner side gap 231, the arc-shaped inner wall guides the gas to start rotational motion without any resistance, so that the gas flow rate can be maintained at a high level, avoiding the energy loss caused by sudden turning or excessive friction. At the same time, this structure is suitable for processing, which can improve the production efficiency and ensure the consistency of the product.

[0057] In some examples, the center of the groove 212 is located radially outside the lap surface formed by the first lap portion 211 and the second lap portion 221, which is equivalent to the center being outside. From the perspective of airflow guidance, when the gas flows into the groove 212, due to the center being outside, the radius of the gas rotation is increased. The larger radius of rotation can give the gas flow more abundant movement space, promote the rotation trajectory to be more smooth, thereby reducing the probability of mutual collision and disorder between the gas flows, allowing the gas flow to circulate in the space formed by the groove 212 and the inner side gap 231 in a more orderly state, stably maintaining the effect of the gas curtain seal, and ensuring the sealing of the stationary vane sector 200.

[0058] In some examples, the distal end of the second lap portion 221 forms a chamfer 222. The chamfer 222 cooperates with the groove 212 to form a rotation structure, so that the leaked gas enters the groove 212 along the inner side gap 231, and flows back into the inner side gap 231 along the chamfer 222. The chamfer 222 and the groove 212 are seamlessly connected, which can accurately guide the gas that has rotated to a certain extent in the groove 212 back into the inner side gap 231 and collide with the subsequent leakage flow, effectively increasing the flow resistance of the leakage flow. This structure uses the rotation and circulation of the gas flow itself to form a dynamic gas seal around the inner side gap 231 without the aid of additional complex sealing devices. On the other hand, the entire process is achieved by relying on the natural flow characteristics of the gas, which reduces the maintenance cost and failure risk caused by mechanical friction and component wear compared to traditional sealing methods that rely on mechanical components to forcibly block, prolongs the service life of the equipment, and ensures the stability and economy of the equipment operation.

[0059] In some examples, the stationary vane sector 200 further includes a sealing ring 240. The sealing ring 240 is arranged between the first lap portion 211 and the second lap portion 221. The sealing ring 240 can fill the gap between the first lap portion 211 and the second lap portion 221. When the stationary vane sector 200 starts to work and the inside is subjected to airflow impact and pressure changes, the sealing ring 240 can adaptively adjust the shape, tightly abut against the surface of the upper and lower lap portions, prevent gas from escaping by relying on its good sealing characteristics, and continuously maintain the sealing effect, thereby ensuring the sealing of the stationary vane sector 200 when working, and improving the operating efficiency and stability of the entire device.

[0060] In some examples, the sealing ring 240 is a C-shaped sealing ring 240. The C-shaped sealing ring 240 has good elastic deformation capacity and sealing potential. From the perspective of thermal expansion and contraction, the stator segment 200 inevitably encounters temperature fluctuations during operation, causing the first lap joint 211 and the second lap joint 221 to change in size. The C-shaped sealing ring 240 is elastic and has a reserved expansion space. When the temperature rises, the components expand, and the sealing ring 240 can moderately stretch along the opening direction; when the temperature drops, the components shrink, and it can also retract accordingly, maintaining a stable sealing state and ensuring that the stator segment 200 maintains efficient and stable sealing performance under complex working conditions.

[0061] Preferably, the sealing ring 240 is made of a damping energy-absorbing material. The damping energy-absorbing material generally has good elasticity and flexibility, which can better adapt to the small gap changes and surface irregularities between the first lap joint 211 and the second lap joint 221, ensuring that it can be tightly attached under various working conditions, effectively filling the gap and preventing gas leakage, thereby improving the sealing effect of the stator segment 200. When there are instantaneous pressure fluctuations, airflow impacts, or slight collisions between components, etc., the damping energy-absorbing material can act as a buffer to absorb and dissipate these impact energies, protecting the surface of the sealing ring 240 and the first lap joint 211 and the second lap joint 221 in contact with it, reducing wear, scratches, and other forms of damage, and prolonging the service life of the components. In addition, when operating, the temperature will change, causing the components of the stator segment 200 to expand and contract. The damping energy-absorbing material has certain compressibility and elastic recovery capacity, and can adaptively adjust the shape and size with temperature changes, always maintaining good sealing and damping effects, effectively solving the problems of poor sealing and poor component fit caused by thermal expansion and contraction. More preferably, the damping energy-absorbing material is a metal material.

[0062] It is obvious to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present application without departing from the spirit and scope of the present application. Therefore, it is intended to cover modifications and variations of the present application that fall within the scope of the appended claims and their equivalents.

Claims

1. A vane segment with a seal structure, characterized by, The application relates to a sealing ring for a rotating shaft, which comprises: a first sector, one side of the top of which extends outward in the circumferential direction to form a first lap joint; a second sector, one side of the bottom of which extends outward in the circumferential direction to form a second lap joint; the bottom surface of the first lap joint and the top surface of the second lap joint are in lap joint cooperation, an outside gap is formed between the top of the first sector and the second sector, and an inside gap is formed between the bottom of the first sector and the second sector.

2. The vane segment with seal structure of claim 1, wherein, the bottom surface of the first lap joint is provided with a groove in the circumferential direction, and the groove is in communication with the inside gap.

3. The vane segment with seal structure of claim 2, wherein, the cross section of the groove is arc-shaped.

4. The vane segment with seal structure of claim 3, wherein, the center of the groove is located on the radial outside of the lap joint surface formed by the first lap joint and the second lap joint.

5. The vane segment with seal structure of claim 2, wherein, the distal end of the second lap joint is formed with a chamfer, and the chamfer and the groove structure form a spiral structure to enable leaked gas to enter the groove along the inside gap and flow back into the inside gap along the chamfer.

6. The vane segment with seal structure of claim 1, wherein, the sealing ring further comprises a sealing ring, which is arranged between the first lap joint and the second lap joint.

7. The vane segment with seal structure of claim 6, wherein, the sealing ring is a C-shaped sealing ring.

8. The vane segment with seal structure of claim 7, wherein, the sealing ring is made of a damping energy-absorbing material.

9. The vane segment with seal structure of claim 8, wherein, the damping energy-absorbing material is a metal material.

Images