Sealing structure of guide vane end face of water turbine

Abstract

The utility model discloses a sealing structure of a water turbine guide vane end face, and belongs to the field of water turbine generator sealing. Comprising a guide vane; the cover body is provided with a mounting cavity; the sealing assembly is arranged in the mounting cavity; the sealing assembly comprises a sealing ring arranged in the mounting cavity; the pressing ring is arranged in the mounting cavity, and one end of the pressing ring abuts against the sealing ring; the anti-vibration pad is arranged in the mounting cavity and abuts against the sealing ring and the inner wall of the mounting cavity; a first through hole and a second through hole which are used for increasing the elasticity of the anti-vibration pad are formed in the anti-vibration pad; the first through hole and the second through hole are arranged in parallel. The sealing structure for the guide vane end face of the water turbine has the beneficial effect that the sealing effect is good.

Description

Technical Field

[0001] The present application relates to the field of water turbine generator sealing, and in particular to a sealing structure for the end face of a water turbine guide vane. Background Art

[0002] The movable guide vanes of the hydro-turbine generator set are fully closed. When the unit is shut down, the outer side of the movable guide vanes is filled with pressurized water. The higher the operating head of the unit, the greater the water pressure on the outer side. After the unit is shut down, in order to facilitate maintenance, there are strict quantitative requirements for the leakage of the end and vertical surfaces of the movable guide vanes. In order to reduce the leakage of the movable guide vanes, the hydro-turbine generator set generally sets end seals on the upper and lower end surfaces of the movable guide vanes. The upper and lower end face seals are respectively assembled on the top cover and the bottom ring. Due to the installation position of the end face seal, it can only be replaced when the unit is overhauled (in the industry, the general unit needs to be overhauled for a period of 10 years or more, that is, a major overhaul every 10 years). Therefore, the movable guide vane end face seal must have reliable sealing performance. Especially for high-head and ultra-large mixed flow units, it is necessary to design a new sealing structure to enhance the sealing performance of the guide vane end face. The turbine movable guide vane end face seal is a necessary device for the hydro-turbine generator set. It refers to the seal that prevents water leakage between the end face of the guide vane body and the top cover and the bottom ring when the movable guide vane is fully closed, so as to ensure the normal function of the hydro-turbine generator set. In view of this, it is necessary to design a turbine movable guide vane end face sealing device, which has the advantages of good sealing compression and elastic recovery, simple structure, convenient installation, and small replacement and maintenance workload. Utility Model Content

[0003] The content of this application is used to introduce concepts in a brief form, which will be described in detail in the detailed implementation section below. The content of this application is not intended to identify the key features or essential features of the technical solution claimed for protection, nor is it intended to limit the scope of the technical solution claimed for protection.

[0004] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a sealing structure for the end face of a turbine guide vane, including:

[0005] Guide vanes;

[0006] The cover body is provided with a mounting cavity;

[0007] A sealing component is arranged in the installation cavity;

[0008] The sealing assembly includes:

[0009] A sealing ring, arranged in the installation cavity;

[0010] A pressure ring is arranged in the installation cavity, and one end of the pressure ring abuts against the sealing ring;

[0011] A vibration-damping pad is disposed in the installation cavity and abuts against the sealing ring and the inner wall of the installation cavity;

[0012] The vibration damping pad is provided with a first through hole and a second through hole for increasing the elasticity of the vibration damping pad;

[0013] The first through hole and the second through hole are arranged in parallel.

[0014] When the guide vane leaves the closed position, the vibration damping pad uses elasticity to make the sealing ring bounce up. When the guide vane is in the closed position, the end face of the guide vane contacts the sealing ring, and the sealing ring is compressed by elasticity, so that the sealing ring and the end face of the guide vane are in hard contact, thereby maintaining zero gap between the two, reducing water leakage when the guide vane is closed, and preventing the unit from creeping.

[0015] Furthermore, the diameters of the first through hole and the second through hole are the same.

[0016] Furthermore, the sealing component also includes:

[0017] The backing plate is arranged in the installation cavity, and the sealing ring and the vibration damping pad are located in the backing plate.

[0018] Furthermore, the backing plate comprises:

[0019] Connecting part;

[0020] an elastic portion connected to the connecting portion;

[0021] A first extrusion portion connected to the elastic portion;

[0022] A second extrusion portion connected to the first extrusion portion;

[0023] The elastic part, the first extrusion part and the second extrusion part are all in two pieces, and an opening is provided between the two second extrusion parts.

[0024] Furthermore, the first extrusion portion and the second extrusion portion are connected to form an "L" shape.

[0025] Furthermore, a protrusion is provided on the anti-wear plate, and the protrusion is located on the installation cavity away from one end of the pressure ring; one end of the protrusion abuts against one end of the sealing ring.

[0026] The beneficial effect of the present application is that it provides a sealing structure for the end face of a turbine guide vane with good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The illustrative embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application.

[0028] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the components and elements are not necessarily drawn to scale.

[0029] In the attached picture:

[0030] Figure 1 is an overall schematic diagram according to an embodiment of the present application;

[0031] Figure 2 It is a structural schematic diagram of a part of an embodiment, mainly showing a sealing assembly;

[0032] Figure 3 It is a structural schematic diagram of a part of the embodiment, mainly showing the pad.

[0033] Reference numerals:

[0034] 1. Guide vane; 2. Cover body; 3. Anti-wear plate; 4. Sealing assembly; 5. Mounting cavity; 6. Bolt; 7. Sealing ring; 8. Pressure ring; 9. Vibration damping pad; 10. Backing plate; 11. Bump; 12. Connecting part; 13. Elastic part; 14. First extrusion part; 15. Second extrusion part; 16. First through hole; 17. Second through hole. DETAILED DESCRIPTION

[0035] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0036] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0037] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0038] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0039] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] Reference Figure 1-3 The sealing structure of the guide vane end face of the turbine comprises a guide vane 1, a cover 2, and a sealing assembly 4; the cover 2 comprises an anti-wear plate 3, a mounting cavity 5 is provided on the cover 2, and the sealing assembly 4 is arranged in the mounting cavity 5. The sealing assembly 4 comprises a bolt 6, a sealing ring 7, a pressure ring 8, and a vibration damping pad 9; the sealing ring 7 and the vibration damping pad 9 are sequentially installed in the mounting cavity 5, and the sealing ring 7 partially extends out of the mounting cavity 5. One end of the pressure ring 8 abuts against the sealing ring 7, and the pressure ring 8 is fixed in the mounting cavity 5 by the bolt 6.

[0041] The sealing assembly 4 also includes a gasket 10, which is arranged in the installation cavity 5. The sealing ring 7 and the vibration damping pad 9 are located in the gasket 10. One end of the sealing ring 7 abuts against the pressure ring 8 through the gasket 10. A protrusion 11 is provided on the anti-wear plate 3. The protrusion 11 is located on the installation cavity 5 away from one end of the pressure ring 8; one end of the protrusion 11 abuts against the other end of the sealing ring 7 through the gasket 10. Under the action of the gasket 10, the sealing effect between the sealing ring 7 and the pressure ring 8 is strengthened. When the guide vane 1 leaves the closed position, the vibration damping pad 9 uses elasticity to make the sealing ring 7 bounce up. When the guide vane 1 is in the closed position, the end face of the guide vane 1 contacts the sealing ring 7, and the sealing ring 7 is compressed by elasticity, so that the sealing ring 7 is in hard contact with the end face of the guide vane 1, so that the gap between the two is maintained at zero, reducing the amount of water leakage when the guide vane 1 is closed, and preventing the creep of the unit.

[0042] The sealing ring 7 is made of special stainless steel with good wear resistance.

[0043] The pressing ring 8 is made of stainless steel.

[0044] The pad 10 is made of rubber material. The pad 10 includes a connecting portion 12, an elastic portion 13, a first extrusion portion 14, and a second extrusion portion 15; the elastic portion 13, the first extrusion portion 14, and the second extrusion portion 15 are two each, and the elastic portion 13 is arranged at both ends of the connecting portion 12, the first extrusion portion 14 is connected to the elastic portion 13, and the second extrusion portion 15 is connected to the first extrusion portion 14. Among them, the first extrusion portion 14 and the second extrusion portion 15 are connected to form an "L" shape. There is an opening between the two second extrusion portions 15. When it is necessary to install the sealing ring 7 and the vibration damping pad 9 in the pad 10, the opening between the two second extrusion portions 15 is enlarged by bending the elastic portion 13 outward, so as to facilitate the placement of the sealing ring 7 and the vibration damping pad 9; then the elastic portion 13 is restored by its own elasticity. Thereby, it is convenient to install and limit the sealing ring 7 and the vibration damping pad 9.

[0045] The vibration damping pad 9 is made of rubber material. A first through hole 16 and a second through hole 17 are provided on the vibration damping pad 9. The first through hole 16 and the second through hole 17 can increase the elasticity of the vibration damping pad 9, thereby improving the resilience and recovery force of the vibration damping pad 9.

[0046] The first through hole 16 and the second through hole 17 have the same diameter.

[0047] The first through hole 16 and the second through hole 17 are arranged in parallel.

[0048] The above descriptions are only some preferred embodiments of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with the technical features with similar functions disclosed in the embodiments of the present disclosure (but not limited to) and the technical solutions formed.

Claims

1. A sealing structure for the end face of a turbine guide vane, include: Guide vanes; The cover body is provided with an installation cavity; A sealing assembly is arranged in the installation cavity; Features: The sealing assembly comprises: A sealing ring, arranged in the installation cavity; A pressure ring, arranged in the installation cavity, and having one end abutting against the sealing ring; A vibration-damping pad, disposed in the installation cavity and abutting against the sealing ring and the inner wall of the installation cavity; The vibration damping pad is provided with a first through hole and a second through hole for increasing the elasticity of the vibration damping pad; The first through hole and the second through hole are arranged in parallel.

2. The sealing structure of the guide vane end face of the turbine according to claim 1, Features: The first through hole and the second through hole have the same diameter.

3. The sealing structure of the guide vane end face of the turbine according to claim 1, Features: The sealing assembly further comprises: A pad is arranged in the installation cavity, and the sealing ring and the vibration-damping pad are located in the pad.

4. The sealing structure of the guide vane end face of the turbine according to claim 3, Features: The backing plate comprises: Connecting part; an elastic portion connected to the connecting portion; A first extrusion portion connected to the elastic portion; a second extrusion portion, connected to the first extrusion portion; The elastic part, the first extrusion part and the second extrusion part are all two in number, and an opening is provided between the two second extrusion parts.

5. The sealing structure of the guide vane end face of the turbine according to claim 4, Features: The first extrusion portion and the second extrusion portion are connected to form an "L" shape.

6. The sealing structure of the guide vane end face of a water turbine according to claim 1, Features: The cover body is provided with an anti-wear plate, the anti-wear plate is provided with a convex block, and the convex block is located on the installation cavity away from one end of the pressure ring; one end of the convex block abuts against one end of the sealing ring.

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